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Littérature scientifique sur le sujet « Macrophages »

Auteur : Grafiati

Publié le 4 juin 2021

Mis à jour le 26 avril 2025

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Articles de revues sur le sujet "Macrophages"

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Rodriguez, Eric, Frederic Boudard, Michele Mallié, Jean-Marie Bastide et Madeleine Bastide. « Murine macrophage elastolytic activity induced by Aspergillus fumigatus strains in vitro : evidence of the expression of two macrophage-induced protease genes ». Canadian Journal of Microbiology 43, n^o 7 (1 juillet 1997) : 649–57. http://dx.doi.org/10.1139/m97-092.

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The interaction between Aspergillus fumigatus conidia and murine macrophages of various origins was investigated. Cocultures were carried out between A. fumigatus strains and freshly isolated murine pulmonary alveolar macrophages or two murine macrophage cell-lines: murine alveolar cell-line MALU and murine astrocytoma cell-line J774. By measuring the variation of elastolytic activity in the coculture supernatants with two elastin substrates, we demonstrated that either viable or fixed A. fumigatus or C. albicans yeasts or nonspecific particles induced significant macrophage elastolytic activity. The effect of A. fumigatus supernatant or the purified A. fumigatus galactomannan suggested also the possible involvement of this polysaccharide in macrophage-protease gene expression, release, and activity in invasive aspergillosis. The effect of inhibitory compounds demonstrated the potential implication of a macrophagic metalloprotease and a macrophagic cysteine protease. RNA analysis allowed us to demonstrate the induction of expression of two macrophagic protease genes in stimulated macrophages. Two distinctive mechanisms appeared to be implicated in macrophage protease induction: nonspecific phagocytosis in the earliest times of the coculture and (or) specific galactomannan recognition after its gradual release by the mycelium.Key words: Aspergillus fumigatus, macrophages, proteases, invasive aspergillosis, galactomannan.

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Lu, Yufei, Leiming Guo et Gaofeng Ding. « PD1+ tumor associated macrophages predict poor prognosis of locally advanced esophageal squamous cell carcinoma ». Future Oncology 15, n^o 35 (décembre 2019) : 4019–30. http://dx.doi.org/10.2217/fon-2019-0519.

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Aim: Tumor associated macrophages are the most abundant cancer immune cells. However, little was known about the identity of CD68+PD1+ macrophages as well as the contributions in the prognosis of esophageal squamous cell carcinoma (ESCC). Methods & methods: Immunofluorescence, flowcytometry and RT-PCR were used to analysis PD1+ macrophages in ESCC. Results: CD68+PD1+ macrophages which can express higher M2 markers in cancer tissues, increased about 4.2-times compared with para-cancer tissues. Additionally, PD1high macrophages were significantly correlated with more malignant phenotypes and poor prognosis. PD1 treatment can enhance phagocytosis of cultured macrophages and redirect this macrophage to M1-like phenotype. Conclusion: Thus, our findings overall indicate that CD68+PD1+ macrophages are tumor associated macrophagess in ESCC, which can forecast the prognosis of ESCC.

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Hargarten, Jessica C., Tyler C. Moore, Thomas M. Petro, Kenneth W. Nickerson et Audrey L. Atkin. « Candida albicans Quorum Sensing Molecules Stimulate Mouse Macrophage Migration ». Infection and Immunity 83, n^o 10 (20 juillet 2015) : 3857–64. http://dx.doi.org/10.1128/iai.00886-15.

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The polymorphic commensal fungusCandida albicanscauses life-threatening disease via bloodstream and intra-abdominal infections in immunocompromised and transplant patients. Although host immune evasion is a common strategy used by successful human fungal pathogens,C. albicansprovokes recognition by host immune cells less capable of destroying it. To accomplish this,C. albicanswhite cells secrete a low-molecular-weight chemoattractive stimulant(s) of macrophages, a phagocyte that they are able to survive within and eventually escape from.C. albicansopaque cells do not secrete this chemoattractive stimulant(s). We report here a physiological mechanism that contributes to the differences in the interaction ofC. albicanswhite and opaque cells with macrophages.E,E-Farnesol, which is secreted by white cells only, is a potent stimulator of macrophage chemokinesis, whose activity is enhanced by yeast cell wall components and aromatic alcohols.E,E-farnesol results in up to an 8.5-fold increase in macrophage migrationin vitroand promotes a 3-fold increase in the peritoneal infiltration of macrophagesin vivo. Therefore, modulation of farnesol secretion to stimulate host immune recognition by macrophages may help explain why this commensal is such a successful pathogen.

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Yadav, Mahesh, et Jeffrey S. Schorey. « The β-glucan receptor dectin-1 functions together with TLR2 to mediate macrophage activation by mycobacteria ». Blood 108, n^o 9 (1 novembre 2006) : 3168–75. http://dx.doi.org/10.1182/blood-2006-05-024406.

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AbstractPattern recognition receptors (PRRs) play an essential role in a macrophage's response to mycobacterial infections. However, how these receptors work in concert to promote this macrophage response remains unclear. In this study, we used bone marrow–derived macrophages isolated from mannose receptor (MR), complement receptor 3 (CR3), MyD88, Toll-like receptor 4 (TLR4), and TLR2 knockout mice to examine the significance of these receptors in mediating a macrophage's response to a mycobacterial infection. We determined that mitogen-activated protein kinase (MAPK) activation and tumor necrosis factor-α (TNF-α) production in macrophage infected with Mycobacterium avium or M smegmatis is dependent on myeloid differentiation factor 88 (MyD88) and TLR2 but not TLR4, MR, or CR3. Interestingly, the TLR2-mediated production of TNF-α by macrophages infected with M smegmatis required the β-glucan receptor dectin-1. A similar requirement for dectin-1 in TNF-α production was observed for macrophages infected with M bovis Bacillus Calmette-Guerin (BCG), M phlei, M avium 2151-rough, and M tuberculosis H37Ra. The limited production of TNF-α by virulent M avium 724 and M tuberculosis H37Rv was not dependent on dectin-1. Furthermore, dectin-1 facilitated interleukin-6 (IL-6), RANTES (regulated on activation, normal T expressed and secreted), and granulocyte colony-stimulating factor (G-CSF) production by mycobacteria-infected macrophages. These are the first results to establish a significant role for dectin-1, in cooperation with TLR2, to activate a macrophage's proinflammatory response to a mycobacterial infection.

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Gallego, Carolina, Douglas Golenbock, Maria Adelaida Gomez et Nancy Gore Saravia. « Toll-Like Receptors Participate in Macrophage Activation and Intracellular Control of Leishmania (Viannia) panamensis ». Infection and Immunity 79, n^o 7 (25 avril 2011) : 2871–79. http://dx.doi.org/10.1128/iai.01388-10.

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ABSTRACTToll-like receptors (TLRs) play a central role in macrophage activation and control of parasitic infections. Their contribution to the outcome ofLeishmaniainfection is just beginning to be deciphered. We examined the interaction ofLeishmania panamensiswith TLRs in the activation of host macrophages.L. panamensisinfection resulted in upregulation of TLR1, TLR2, TLR3, and TLR4 expression and induced tumor necrosis factor alpha (TNF-α) secretion by human primary macrophages at comparable levels and kinetics to those of specific TLR ligands. The TLR dependence of the host cell response was substantiated by the absence of TNF-α production in MyD88/TRIF−/−murine bone marrow-derived macrophages and mouse macrophage cell lines in response to promastigotes and amastigotes. Systematic screening of TLR-deficient macrophages revealed that TNF-α production was completely abrogated in TLR4−/−macrophages, consistent with the increased intracellular parasite survival at early time points of infection. TNF-α secretion was significantly reduced in macrophages lacking endosomal TLRs but was unaltered by a lack of TLR2 or MD-2. Together, these findings support the participation of TLR4 and endosomal TLRs in the activation of host macrophages byL. panamensisand in the early control of infection.

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McKenzie, C. G. J., U. Koser, L. E. Lewis, J. M. Bain, H. M. Mora-Montes, R. N. Barker, N. A. R. Gow et L. P. Erwig. « Contribution of Candida albicans Cell Wall Components to Recognition by and Escape from Murine Macrophages ». Infection and Immunity 78, n^o 4 (1 février 2010) : 1650–58. http://dx.doi.org/10.1128/iai.00001-10.

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ABSTRACT The pathogenicity of the opportunistic human fungal pathogen Candida albicans depends on its ability to escape destruction by the host immune system. Using mutant strains that are defective in cell surface glycosylation, cell wall protein synthesis, and yeast-hypha morphogenesis, we have investigated three important aspects of C. albicans innate immune interactions: phagocytosis by primary macrophages and macrophage cell lines, hyphal formation within macrophage phagosomes, and the ability to escape from and kill macrophages. We show that cell wall glycosylation is critically important for the recognition and ingestion of C. albicans by macrophages. Phagocytosis was significantly reduced for mutants deficient in phosphomannan biosynthesis (mmn4Δ, pmr1Δ, and mnt3 mnt5Δ), whereas O- and N-linked mannan defects (mnt1Δ mnt2Δ and mns1Δ) were associated with increased ingestion, compared to the parent wild-type strains and genetically complemented controls. In contrast, macrophage uptake of mutants deficient in cell wall proteins such as adhesins (ece1Δ, hwp1Δ, and als3Δ) and yeast-locked mutants (clb2Δ, hgc1Δ, cph1Δ, efg1Δ, and efg1Δ cph1Δ), was similar to that observed for wild-type C. albicans. Killing of macrophages was abrogated in hypha-deficient strains, significantly reduced in all glycosylation mutants, and comparable to wild type in cell wall protein mutants. The diminished ability of glycosylation mutants to kill macrophages was not a consequence of impaired hyphal formation within macrophage phagosomes. Therefore, cell wall composition and the ability to undergo yeast-hypha morphogenesis are critical determinants of the macrophage's ability to ingest and process C. albicans.

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Wilson, Justin E., Bhuvana Katkere et James R. Drake. « Francisella tularensis Induces Ubiquitin-Dependent Major Histocompatibility Complex Class II Degradation in Activated Macrophages ». Infection and Immunity 77, n^o 11 (24 août 2009) : 4953–65. http://dx.doi.org/10.1128/iai.00844-09.

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ABSTRACT The intracellular bacterium Francisella tularensis survives and replicates within macrophages, ultimately killing the host cell. Resolution of infection requires the development of adaptive immunity through presentation of F. tularensis antigens to CD4+ and CD8+ T cells. We have previously established that F. tularensis induces macrophage prostaglandin E2 (PGE2) production, leading to skewed T-cell responses. PGE2 can also downregulate macrophage major histocompatibility complex (MHC) class II expression, suggesting that F. tularensis-elicited PGE2 may further alter T-cell responses via inhibition of class II expression. To test this hypothesis, gamma interferon (IFN-γ)-activated reporter macrophages were exposed to supernatants from F. tularensis-infected macrophages, and the class II levels were measured. Exposure of macrophages to infection supernatants results in essentially complete clearance of surface class II and CD86, compromising the macrophage's ability to present antigens to CD4 T cells. Biochemical analysis revealed that infection supernatants elicit ubiquitin-dependent class II downregulation and degradation within intracellular acidic compartments. By comparison, exposure to PGE2 alone only leads to a minor decrease in macrophage class II expression, demonstrating that a factor distinct from PGE2 is eliciting the majority of class II degradation. However, production of this non-PGE2 factor is dependent on macrophage cyclooxygenase activity and is induced by PGE2. These results establish that F. tularensis induces the production of a PGE2-dependent factor that elicits MHC class II downregulation in IFN-γ-activated macrophages through ubiquitin-mediated delivery of class II to lysosomes, establishing another mechanism for the modulation of macrophage antigen presentation during F. tularensis infection.

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Careau, Éric, Léa-Isabelle Proulx, Philippe Pouliot, Annie Spahr, Véronique Turmel et Élyse Y. Bissonnette. « Antigen sensitization modulates alveolar macrophage functions in an asthma model ». American Journal of Physiology-Lung Cellular and Molecular Physiology 290, n^o 5 (mai 2006) : L871—L879. http://dx.doi.org/10.1152/ajplung.00219.2005.

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We have previously demonstrated that adoptive transfer of alveolar macrophages from allergy-resistant rats to alveolar macrophage-depleted allergic rats prevents airway hyperresponsiveness development, suggesting an important role for alveolar macrophages in asthma pathogenesis. Given that ovalbumin sensitization can modulate alveolar macrophage cytokine production, we investigated the role of sensitized and unsensitized alveolar macrophages in an asthma model. Alveolar macrophages from unsensitized or sensitized Brown Norway rats were transferred to alveolar macrophage-depleted sensitized rats 24 h before allergen challenge. Airway responsiveness to methacholine and airway inflammation were measured the following day. Methacholine concentration needed to increase lung resistance by 200% was significantly higher in alveolar macrophage-depleted sensitized rats that received unsensitized alveolar macrophages compared with alveolar macrophage-depleted sensitized rats that received sensitized alveolar macrophages. Tumor necrosis factor levels in bronchoalveolar lavage fluid of sensitized rats that received unsensitized alveolar macrophages were significantly lower compared with rats that received sensitized alveolar macrophages. Interestingly, alveolar macrophages of unsensitized animals showed higher phagocytosis activity compared with alveolar macrophages of sensitized rats, suggesting that sensitization modulates alveolar macrophage phagocytosis function. Our data suggest an important role of allergen sensitization on alveolar macrophage function in asthma pathogenesis.

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Shinonaga, Masamichi, Cha Cheng Chang, Noriyuki Suzuki, Masazumi Sato et Takeo Kuwabara. « Immunohistological evaluation of macrophage infiltrates in brain tumors ». Journal of Neurosurgery 68, n^o 2 (février 1988) : 259–65. http://dx.doi.org/10.3171/jns.1988.68.2.0259.

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✓ Peritumoral edema is one of the most serious complications of intracranial neoplasms; however, the exact pathogenesis of this condition is still unknown. To explore the effect of macrophages in brain tumors on the pathogenesis of peritumoral edema, 42 specimens of primary or metastatic brain tumors were studied. Frozen sections were examined by an immunoperoxidase staining technique with anti-Leu-M3 monoclonal antibody. Eight of 14 gliomas demonstrated Leu-M3-positive cell (macrophage) infiltration. The two glioblastomas showed a moderate or marked degree of macrophage infiltration. Twelve of 16 meningiomas demonstrated varying degrees of macrophage infiltration. All six metastatic brain tumors exhibited prominent macrophagesin intra- and peritumoral tissues. Four acoustic neurinomas and two hemangioblastomas showed a slight to moderate degree of macrophage infiltration. Excellent correlation was found between the degree of macrophage infiltration seen on immunoperoxidase staining and the peritumoral edema detected on computerized tomography brain scans of patients with supratentorial tumors, especially meningiomas. Macrophages are known to secrete various substances (including arachidonate metabolites) that may interfere with vascular permeability. These data suggest that macrophages infiltrating brain tumors may play an important role in the pathogenesis of peritumoral edema.

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Fedorov, A. A., N. A. Ermak, T. S. Gerashchenko, E. B. Topolnitskii, N. A. Shefer, E. O. Rodionov et M. N. Stakheyeva. « Polarization of macrophages : mechanisms, markers and factors of induction ». Siberian journal of oncology 21, n^o 4 (3 septembre 2022) : 124–36. http://dx.doi.org/10.21294/1814-4861-2022-21-4-124-136.

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Macrophages are key components of the innate immune system. The variability of the macrophage’s participation in tumor progression, determined by their functional polarization, opens up a wide prospect for modulating their functional profile, primarily in the direction of increasing antitumor activity. The purpose of the study was to provide up-to-date data on the process of macrophage polarization, mechanisms of its regulation, polarization markers and induction factors. Material and methods. A search was made for available literature sources published in Web of Science, Scopus and other databases. more than 160 sources devoted to the study of the process of macrophage polarization were found, of which 121 were included in this review. Results. This review presents data on the molecular mechanisms and gene signatures associated with M1 and M2 polarization of macrophages. We displayed information on metabolic, phenotypic characteristics and cytokine profile of M1- and M2-macrophages, as well as highlighted data on polarization factors and targets of their action. Conclusion. The information presented in the review can serve as an information base for the development of experimental and clinical approaches for editing the functional profile of macrophages in order to control their involvement in various pathological processes.

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Thèses sur le sujet "Macrophages"

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Svensson, Ulf. « Macrophage activation by bacteria signalling to prostaglandin and cytokine responses / ». Lund : Dept. of Medical & ; Physiological Chemistry, Lund University, 1994. http://books.google.com/books?id=sAhrAAAAMAAJ.

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Higuera, González Laura 1993. « Novel transcription regulators of tissue macrophages and alternative macrophage polarization ». Doctoral thesis, TDX (Tesis Doctorals en Xarxa), 2021. http://hdl.handle.net/10803/672702.

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Macrophages play crucial roles in the defense of the organism against a wide range of pathogens. Macrophages can rapidly adapt to perturbations in the microenvironment due to the existence of a network of transcription factors that modulates their responses. While transcription factors that regulate macrophage identity have been widely described in the past decades, the role of transcription regulators that fine-tune tissue macrophage responses in homeostasis and infection is starting to be elucidated. Our group has previously identified transcription regulators of pro-inflammatory macrophage responses, and in the present work we have explored the function of novel transcription mechanisms that participate in the regulation of the homeostatic distribution of tissue macrophages and in anti-inflammatory macrophage responses. We have studied ontogenically different macrophage populations inhabiting different tissues and have characterized their transcription regulation. We have also compared the anti-inflammatory response of tissue macrophages and identified a specific transcriptional control of anti-inflammatory gene expression that depends on their ontogeny.
Los macrófagos juegan un papel muy importante en la defensa del organismo frente a una amplia variedad de patógenos. Los macrófagos se adaptan rápidamente a las perturbaciones en el microambiente gracias a que existe una compleja red de factores de transcripción que modulan sus respuestas. En los últimos años se han identificado factores de transcripción que regulan la identidad de los macrófagos, sin embargo, apenas se está comenzando a conocer la importancia de otros factores de transcripción que permiten adaptar la respuesta de los macrófagos, tanto en condiciones homeostáticas como frente a infecciones. Anteriormente nuestro grupo identificó reguladores transcripcionales de las respuestas pro-inflamatorias de los macrófagos, y en este trabajo hemos explorado la función de nuevos mecanismos reguladores que participan en la regulación de la distribución de los macrófagos en homeostasis, así como en las respuestas anti-inflamatorias de los macrófagos. Hemos estudiado poblaciones de macrófagos con diferentes ontogenias que habitan dentro de los tejidos y hemos caracterizado su regulación transcripcional. Además, hemos comparado la respuesta anti-inflamatoria de los diferentes macrófagos tisulares y así hemos identificado que existe un mecanismo transcripcional específico que controla la expresión de genes anti-inflamatorios según el origen del macrófago.

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Tabata, Yasuhiko. « Macrophage phagocytosis of polymer microspheres and antitumor activation of macrophages ». Kyoto University, 1987. http://hdl.handle.net/2433/74704.

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Raborn, Erinn Shenee. « Cannabinoid Modulation of Chemotaxis of Macrophages and Macrophage-like Cells ». VCU Scholars Compass, 2007. http://hdl.handle.net/10156/1333.

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Grand-Perret, Thierry A. R. « Induction d'une activité anti-tumorale chez les macrophages péritonéaux murins ». Paris 11, 1986. http://www.theses.fr/1986PA112301.

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Bouchareychas, Laura. « Implication des phagocytes mononuclées dans l'évolution de la plaque d'athérosclérose et relation avec l'homéostasie du cholestérol et des lipoprotéines ». Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066282/document.

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L'athérosclérose est un processus physiopathologique chronique impliqué dans la majorité des maladies cardio-vasculaires. Le développement des lésions d'athérosclérose est caractérisé par l'accumulation de lipides extra et intracellulaires dans la paroi artérielle à l'origine d'une forte réponse inflammatoire impliquant notamment les macrophages. Les macrophages sont considérés comme des acteurs clés dans le développement des plaques d'athérosclérose. En effet, de par leur capacité à métaboliser le cholestérol (captation, stockage, efflux), à réguler l'inflammation et à phagocyter les cellules apoptotiques, ils exercent des fonctions pro et/ou anti-athèrogènes qui peuvent être modulées à des fins thérapeutiques. Dans cette perspective, nous avons évalué le pouvoir thérapeutique des " macrophages protégés de l'apoptose " sur la progression des lésions d'athérosclérose constituées. Nous avons démontré que l'augmentation de la survie des macrophages permet de ralentir la progression des lésions, de stabiliser les lésions et de diminuer la cholestérolémie. Ces effets athéro-protecteurs sont attribués à l'augmentation des cellules de Kupffer et des monocytes Ly-6Clow en partie par leur capacité à produire de l'apolipoprotéine E. Nous montrons également que les cellules de Kupffer participent à la clairance des lipoprotéines pro-athérogènes. L'augmentation du pool d'apoE ainsi que l'augmentation des cellules de Kupffer permettent de diminuer la cholestérolémie et ainsi de diminuer la progression des lésions
Atherosclerosis represents a chronic pathophysiological process implicated in the majority of cardiovascular diseases. The development of atherosclerotic lesions is characterized by an accumulation of extra and intracellular lipids in the arterial wall at the origin of a strong inflammatory response involving macrophages.Macrophages are considered key actors in the development of atherosclerotic plaques. Indeed, because of their ability to metabolize cholesterol (capture, storage, efflux), to regulate inflammation and to phagocyte apoptotic cells, they exert pro and/or anti-atherogenic functions that may be modulated therapeutically. In this context, we evaluated the therapeutic potential of macrophages protected against apoptosis, on the progression of established atherosclerotic lesions.We have demonstrated that increased macrophage survival can slow down the progression of established lesions, stabilize lesion and reduce cholesterol levels. These athero-protective effects are attributed to the increase in Kupffer cells and Ly-6Clow monocytes partly due to their ability to produce apolipoprotein E. We also show that Kupffer cells are involved in the clearance of pro-atherogenic lipoproteins. The increase in ApoE pool and in Kupffer cells reduces cholesterol levels and thus lesion progression

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Di, Maggio Paula. « Dietary lipids and inflammation : chylomicron remnants suppress pro-inflammatory pathways and activate antioxidant defence mechanisms in human macrophages ». Thesis, Royal Veterinary College (University of London), 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.618287.

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Georges, George Tharwat. « Novel Characteristics of Murine Bone Marrow-Derived Macrophages and Human Macrophage-Like Cells ». VCU Scholars Compass, 2006. http://scholarscompass.vcu.edu/etd/932.

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These studies provide evidence for novel properties of macrophages derived from bone marrow stem cells. In study 1, treatment of activated mouse bone marrow-derived macrophages (BMM) with either catecholamine synthesis inhibitors (α-methyl-para-tyrosine and fusaric acid) or the β2 adrenergic receptor antagonist ICI 118,551 demonstrated that BMM produce catecholamines. The catecholamines modulated macrophage cytokine production through autocrine actions on adrenergic receptors. In study II, undifferentiated human bone marrow cells were incubated in 30% mouse L929 fibroblast conditioned medium and generated adherent cells within three days. The cells were clearly identifiable as macrophages based on surface proteins and phagocytic activity but produced only low levels of the cytokines tumor necrosis factor-α and interleukin-lβ. Cytokine production did not increase in response to the bacterial endotoxin lipopolysaccharide (LPS). Generation of these macrophage-like cells was not repeatable with other samples of human bone marrow, but the cells continue to proliferate in cell culture and will be investigated further in future studies.

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Awomoyi, Agnes Abiola Oluwatoyin. « Genetics of susceptibility to tuberculosis ». Thesis, Open University, 2000. http://oro.open.ac.uk/58012/.

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Convincing evidence that activated macrophages play a critical role in control of mycobacterial diseases has been clearly established from animal and in-vitro studies. Macrophages produce a variety of molecules upon appropriate stimulation, which act in concert towards eventual killing of bacteria. People with SUb-optimal macrophage activation are more susceptible to infection with intracellular pathogens. My project aims to answer two questions relating to genetic regulation of macrophage activation in tuberculosis: do macrophage genes regulate microbial-induced responses and do macrophage genes influence susceptibility to tuberculosis? A whole blood assay was used to investigate IFN-y responsiveness in healthy individuals and those who develop tuberculosis in The Gambia. Cytokine responses to lipopolysaccaride (LPS), Lipoarabinomanan (LAM) and the enhancing effect of IFN-y on these stimulants were measured. LPS induced IL-l 0 levels was higher in recovered TB cases than in controls (p=0.02). LPS and LAM induced cytokines were highly correlated (p<0.0001) similarly, levels of IL-IB and TNF were highly correlated (P

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Suñer, Navarro Clara. « CPEB4 function in macrophages ». Doctoral thesis, Universitat de Barcelona, 2018. http://hdl.handle.net/10803/663483.

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As innate immune cells, macrophages sense endogenous and exogenous danger signals and respond orchestrating inflammatory processes. For the rapid induction and efficient resolution of inflammatory responses, macrophages induce the expression of pro- inflammatory and anti-inflammatory mediators, which cross-regulate each other through feedback loops. This process requires tightly controlled gene expression at multiple levels. Recently, the regulation of mRNA deadenylation has emerged as a key regulator of the strength and, critically, the duration of transient inflammatory responses. Cytoplasmic Polyadenylation Element Binding (CPEB1-4) family of RNA-binding proteins target mRNAs containing Cytoplasmic Polyadenylation Elements (CPEs) in their 3’UTR. CPEBs orchestrate the assembly of two types of ribonucleoprotein complexes (mRNPs) which can repress or stimulate the translation of target mRNAs by modulating the length of poly(A) tail. Several inflammatory mediators harbour CPEs in their 3’UTRs and are potential CPEB targets. Thus, we hypothesized that CPEBs could be an additional checkpoint to control inflammatory responses. We find that CPEB4 is a novel player in macrophage response to LPS. Upon LPS treatment, CPEB4 is upregulated and its polyadenylation function is activated, a process mediated by the MAPK p38α and ERK1/2 and two AU Rich Element Binding Proteins (ARE-BPs). Interestingly, the pattern of CPEB4 expression and activity suggests that it participates in late LPS-response, when the resolution of inflammation occurs. Indeed, myeloid-specific Cpeb4KO mice display increased sensitivity to LPS-induced endotoxic shock. We identify CPEB4 target mRNAs by RNA-Immunoprecipitation and Sequencing (RIP-Seq), uncovering that CPEB4 regulates the expression of negative regulators of MAPK signalling, thus creating the negative feedback loop needed the resolution of inflammation. Moreover, we also describe how the interplay between CPEB4, HuR and TTP defines mRNA behaviour during the different temporal windows of inflammatory responses.
Como células del sistema inmune innato, los macrófagos detectan señales de peligro endógenas y exógenas y responden desencadenando procesos inflamatorios. Estas respuestas inflamatorias tienen que ser inducidas rápidamente pero a su vez, deben ser eficientemente resueltas. Para ello, los macrófagos inducen la expresión de mediadores pro- y anti- inflamatorios que controlan la expresión unos de otros mediante complejos circuitos regulatorios. Estos procesos requieren un estricto control de la expresión génica a distintos niveles. En los últimos años, se ha descrito que la regulación de los mRNAs por deadenilación es un elemento crucial para regular intensidad y sobretodo la duración de las respuestas inflamatorias. La família de proteínas de unión al RNA CPEBs (Cytoplasmic Polyadenylation Element Binding, CPEB1-4), unen mRNAs que contienen CPEs (Cytoplasmic Polyadenylation Elements) en su 3’UTR. Las CPEBs pueden reclutar dos tipos de complejos en los mRNAs que unen. Estos complejos modulan la longitud de la cola poly(A) y, por tanto, pueden reprimir o estimular su traducción. Los mRNAs de múltiples mediadores inflamatorios y son susceptibles de ser regulados por las CPEBs ya que contienen CPEs en sus 3’UTRs. Por tanto, las CPEBs podrían ser un nuevo mecanismo regulador del desarrollo de las respuestas inflamatorias. En este trabajo hemos descubierto que CPEB4 participa en la respuesta de los macrófagos frente a LPS. El tratamiento con LPS provoca un incremento en los niveles de CPEB4 y promueve que su función sea de polyadenylación. Este proceso es mediado por las MAPK p38α y ERK1/2 y dos proteínas que regulan mRNAs mediante la unión a AREs. El patrón de expresión de CPEB4 sugiere que esta proteína participa en la fase tardía de la respuesta a LPS, cuándo la respuesta inflamatoria es resuelta. Apoyando esta hipótesis, ratones KO para CPEB4 en las células mieloides son más sensibles al shock séptico inducido por LPS. Identificando los mRNAs que CPEB4 regula en este contexto, hemos descrito que CPEB4 regula la expresión de inhibidores de la señalización de la vía MAPK. De este modo, CPEB4 es necesaria para la resolución de la inflamación en respuesta a LPS. Además, hemos descrito como la regulación de mRNAs por CPEB4, HuR y TTP define diferentes patrones temporales de expresión durante el desarrollo de respuestas inflamatorias.

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Livres sur le sujet "Macrophages"

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Kloc, Malgorzata, dir. Macrophages. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-54090-0.

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Rousselet, Germain, dir. Macrophages. New York, NY : Springer New York, 2018. http://dx.doi.org/10.1007/978-1-4939-7837-3.

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Lawrence, Toby, et Thorsten Hagemann, dir. Tumour-Associated Macrophages. New York, NY : Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-0662-4.

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H, Heppner Gloria, et Fulton Amy M. 1950-, dir. Macrophages and cancer. Boca Raton, Fla : CRC Press, 1988.

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Thorsten, Hagemann, et SpringerLink (Online service), dir. Tumour-Associated Macrophages. New York, NY : Springer Science+Business Media, LLC, 2012.

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6

David, Evered, Nugent Jonathan, O'Connor Maeve, Ciba Foundation et Symposium on Biochemistry of Microphages (1985 : Ciba Foundation), dir. Biochemistry of macrophages. Chichester : John Wiley, 1986.

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Mass, Elvira, dir. Tissue-Resident Macrophages. New York, NY : Springer US, 2024. http://dx.doi.org/10.1007/978-1-0716-3437-0.

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David, Evered, Nugent Jonathan, O'Connor Maeve et Symposium on Biochemistry of Macrophages (1985 : Ciba Foundation), dir. Biochemistry of macrophages. London : Pitman, 1986.

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Reiner, Neil E., dir. Macrophages and Dendritic Cells. Totowa, NJ : Humana Press, 2009. http://dx.doi.org/10.1007/978-1-59745-396-7.

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Horton, Michael A., dir. Macrophages and Related Cells. Boston, MA : Springer US, 1993. http://dx.doi.org/10.1007/978-1-4757-9534-9.

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Chapitres de livres sur le sujet "Macrophages"

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Kelly, Aoife, Aleksander M. Grabiec et Mark A. Travis. « Culture of Human Monocyte-Derived Macrophages ». Dans Macrophages, 1–11. New York, NY : Springer New York, 2018. http://dx.doi.org/10.1007/978-1-4939-7837-3_1.

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Ian Cumming, R., et Yen-Rei A. Yu. « Phenotyping Tumor-Associated Macrophages ». Dans Macrophages, 99–109. New York, NY : Springer New York, 2018. http://dx.doi.org/10.1007/978-1-4939-7837-3_10.

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Dalby, Elizabeth. « Activating Murine Macrophages In Vitro ». Dans Macrophages, 111–17. New York, NY : Springer New York, 2018. http://dx.doi.org/10.1007/978-1-4939-7837-3_11.

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Huang, Xuan, Yong Li, Mingui Fu et Hong-Bo Xin. « Polarizing Macrophages In Vitro ». Dans Macrophages, 119–26. New York, NY : Springer New York, 2018. http://dx.doi.org/10.1007/978-1-4939-7837-3_12.

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Roback, Linda, et Lisa P. Daley-Bauer. « Viral Replication Assay in Bone Marrow-Derived Macrophages ». Dans Macrophages, 127–34. New York, NY : Springer New York, 2018. http://dx.doi.org/10.1007/978-1-4939-7837-3_13.

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Aribi, Mourad. « Macrophage Bactericidal Assays ». Dans Macrophages, 135–49. New York, NY : Springer New York, 2018. http://dx.doi.org/10.1007/978-1-4939-7837-3_14.

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Montaño, Fernando, Sergio Grinstein et Roni Levin. « Quantitative Phagocytosis Assays in Primary and Cultured Macrophages ». Dans Macrophages, 151–63. New York, NY : Springer New York, 2018. http://dx.doi.org/10.1007/978-1-4939-7837-3_15.

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Mularski, Anna, Florence Marie-Anaïs, Julie Mazzolini et Florence Niedergang. « Observing Frustrated Phagocytosis and Phagosome Formation and Closure Using Total Internal Reflection Fluorescence Microscopy (TIRFM) ». Dans Macrophages, 165–75. New York, NY : Springer New York, 2018. http://dx.doi.org/10.1007/978-1-4939-7837-3_16.

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Rousselet, Germain. « Chromatin Immunoprecipitation in Macrophages ». Dans Macrophages, 177–86. New York, NY : Springer New York, 2018. http://dx.doi.org/10.1007/978-1-4939-7837-3_17.

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Keller, Andrea-Anneliese, Marten B. Maeß, Michael Schnoor, Berith Scheiding et Stefan Lorkowski. « Transfecting Macrophages ». Dans Macrophages, 187–95. New York, NY : Springer New York, 2018. http://dx.doi.org/10.1007/978-1-4939-7837-3_18.

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Actes de conférences sur le sujet "Macrophages"

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Mahgoub, Yasmine, Rida Arif et Susu Zughaier. « Pyocyanin pigment from Pseudomonas aeruginosa modulates innate immune defenses in macrophages ». Dans Qatar University Annual Research Forum & Exhibition. Qatar University Press, 2021. http://dx.doi.org/10.29117/quarfe.2021.0137.

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Background: Pseudomonas aeruginosa is a well-known opportunistic pathogen. The gram-negative bacillus, commonly associated with hospital-acquired infections, utilizes the host’s impaired immune responses to establish infection. Of its many virulence factors, pyocyanin is essential for P. aeruginosa to establish its full infectivity. Macrophages act as sentinels of the innate immune system, as well as play other roles in homeostasis, tissue remodeling, and bridging between the innate and adaptive immune systems. Aim: This study aimed to investigate the effects of pyocyanin on macrophage innate immune defenses by assessing the function of macrophages treated with pyocyanin and TLR ligands. Phagocytosis of opsonized zymosan, LPS-induced nitric oxide release and cytokine release were used as measures of functional responses. Results: This study found that pyocyanin inhibited phagocytosis-induced ROS release in a dose-dependent manner and reduced nitric oxide release from macrophages induced with P. aeruginosa LPS. In addition, pyocyanin modulated cytokines and chemokines release from macrophages exposed to P. aeruginosa LPS in a dose-dependent manner. Pyocyanin significantly enhanced IL-1β release as well as several chemokines. Therefore, pyocyanin facilitates Pseudomonas aeruginosa to persevere in the immunocompromised host through modulating macrophage’s innate immune defenses. Conclusion: Pyocyanin inhibits macrophage functional defense responses to facilitate Pseudomonas aeruginosa infection.

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van Dam-Mieras, M. C. E., A. D. Muller et G. Hornstra. « DIETARY LIPIDS, INFECTION AND MACROPHAGE PROCOAGULANT ACTIVITY ». Dans XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1643398.

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It is generally accepted that the type of dietary fat influences arterial thrombosis and atherosclerosis. Although it is still largely unknown how the dietary lipid composition influences the process of atherogenesis, it is evident that several cell types are involved. Morphological evidence for the involvement of monocyte/macropages has been given.We described before that the dietary lipid composition has striking effects on the procoagulant activity of macrophages. When macrophages were isolated from the spleens of healthy rats the procoagulant activity slightly decreased during the first few hours after isolation, and reached a plateau value after 4 hours. When, however, macrophages were obtained from animals infected with a pneumona virus (PVM) different results were obtained:Experiments carried out with peripheral blood monocytes showed close resemblance to those described in the table.These results show that:- moncytes/macrophages isolated from PVM-infected animals increase their procoagulant activity during in vitro culture- the differences in macrophage procoagulant activity found in cells obtained from healthy animals fed diets containing different lipids no longer were found in PVM-infected animalsThis would implicate that the infection process has a more profound influence on macrophage procoagulant activity that the composition of the diet

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McGee, Maria, et Henry Rothberger. « MECHANISMS OF PROCOAGULANT GENERATION BY ALVEOLAR MACROPHAGES DURING MATURATION ». Dans XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1643168.

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During maturation in vivo and in vitro alveolar macrophages generate procoagulant(s) capable of activating the extrinsic pathway. It is generally agreed that at least part of the activity is due to TF (tissue factor). However, whether or not macrophages also generate functional factor VII or X is controversial. To characterize procoagulant activity increases, we measured kinetic parameters defining interactions between components of the TF-VII complex on membranes of alveolar macrophages either freshly isolated or cultured in serum free medium. In incubation mixtures with fixed concentrations of macrophages and added factor VII, the rate of factor Xa formation (measured by S-2222 hydrolysis) approached a maximum as factor X concentration was increased. Estimated concentrations of factor X yielding 1/2 maximal activation rates, (apparent Km) were 127.1±26 nM and 99.7±34 nM for fresh and cultured cells, respectively. Vmax (maximal velocities) were 1.21±0.24 and 8.9±5 nM Xa/min/106 cells. When concentrations of added factor X were kept constant, the rate of factor X activation increased as the added factor VII concentration was increased. For fresh and cultured cells, the respective apparent Kd were 1.810.7 and 1.410.25 nM. Maximal rates observed with X concentration fixed at 108 nM were 0.46±10.06 and 5.7±1.6 nM Xa/min/106 cells. In the absence of either added factor X or added factor VII, no factor Xa generation was detected in fresh or cultured cells, during 10-20 min incubation periods used for kinetic studies. The observed increase in Vmax without changes in apparent Km and Kd indicate that gains in procoagulant activity during macrophage maturation are due to increases in the number of functional binding sites for factor VII, without significant generation of functional vitamin K dependent factors (VII and X) by the cells. The data also indicate that maturation does not alter the rate behaviour of the TF-VII enzymatic complex on macrophage membranes. Mechanisms of complex assembly that we observed on macrophage membranes are similar to those described for the TF-VII complex assembly on purified systems.

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Reinhard, Björn M., Hongyun Wang et Linxi Wu. « Monitoring Cellular Trafficking of Nanoparticle Cargo in Murine Macrophages Through Plasmon Coupling Microscopy ». Dans ASME 2013 2nd Global Congress on NanoEngineering for Medicine and Biology. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/nemb2013-93078.

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A detailed analysis of silver nanoparticle (NP) uptake and trafficking in the murine macrophage cell line J774A.1 through spectral analysis of the resonance wavelength of the metal NP cargo is presented. The NP spectra reveal a strong phenotypic variability in the NP uptake and processing on the single cell level. Cells containing non- or low-agglomerated NPs are found to coexist with cells containing NPs of varying degrees of NP agglomeration, clearly indicated by a spectral red-shift in the resonance wavelength. Pharmacological inhibition studies indicate that the observed differences in the intracellular NP organization result from coexisting actin- and clathrin-dependent endocytosis mechanisms. Correlation with fluorescence macrophage maturity markers shows that differentiated J774A.1 macrophages preferentially contain compact NP agglomerates, whereas monocyte-like macrophages contain non-agglomerated NPs.

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Rocha, Aline Carvalho, et Victor Piana Andrade. « The role of tumor-associated macrophages in the prediction of sentinel lymph node involvement in breast cancer ». Dans Brazilian Breast Cancer Symposium 2024, 31. Mastology, 2024. http://dx.doi.org/10.29289/259453942024v34s1031.

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Objective: The purpose of this study was to evaluate the association between the TAM density of breast tumor stroma and sentinel lymph node involvement. Methodology: The cohort consisted of patients with histopathological diagnosis of early-stage invasive breast cancer submitted to mastectomy or quadrantectomy and sentinel lymph node biopsy between January 2007 and December 2012 at a Brazilian referral hospital (A.C.Camargo Cancer Center). Using tissue microarrays, 101 tumors were submitted to immunohistochemistry for total macrophages (CD68), M2 macrophages (CD163), M1 macrophages (HLA-DR), and proliferating macrophages (double staining for CD68 and Ki67). Results: The cut-off values for the macrophage markers were CD68 (110 céls/mm²), CD163 (25 céls/mm²), and HLA-DR (80 céls/mm²). No association was observed between the TAM density of breast tumor stroma and sentinel and lymph node involvement. Low CD68 and CD163 expression was associated with luminal tumors, while high CD68 and CD163 expression was associated with hormone receptor-negative tumors, histological grade III, and high mitotic indices. HLA-DR was not correlated with hormone receptor status, HER2, or anatomopathological variables. Most macrophages displayed no proliferation. Conclusion: Stromal TAMs are not predictive of axillary involvement in tumors of good prognosis.

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Hobro, Alison J., Takeshi Sugiyama, Nicolas Pavillon, Takayuki Umakoshi, Prabhat Verma et Nicholas Smith. « Label-free Raman imaging of saturated and unsaturated fatty acid uptake, storage, and return toward baseline levels in macrophages ». Dans JSAP-Optica Joint Symposia. Washington, D.C. : Optica Publishing Group, 2023. http://dx.doi.org/10.1364/jsapo.2023.19a_a602_1.

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Lipids play many important roles in the body including cell signaling and energy storage. The presence of excessive lipids, or disruption of normal lipid metabolic processes in the cell, has been linked to lifestyle diseases such as atherosclerosis and obesity. Where the affected cells are part of the innate immune system such dysregulation of lipids has also been implicated in impaired immune responses to infection. Therefore, understanding how macrophages are affected by the presence of fatty acids in their local environment is an important step in understanding lifestyle disease development. Using Raman spectroscopic imaging we studied the uptake of several concentrations of palmitic, stearic, oleic and linoleic acid in live macrophage cells. Macrophages readily take up these lipids, which can be observed by Raman imaging at the edge of the cytoplasm close to the cell membrane, with the exact distribution dependent on the nature of the fatty acid (unsaturated/saturated) and the exposure concentration. At the highest concentrations, all fatty acids appear to be toxic to the macrophage cells after 24 hours of exposure. By comparing the Raman intensities of the pure fatty acids and ratiometric imaging of the intensities within the macrophage cells we were able to determine that the toxicity of a fatty acid is not due directly to the amount of fatty acid present in the macrophage, rather the nature of the fatty acid is important. This demonstrates the power of high-resolution ratiometric Raman imaging for bioanalysis. In addition, we monitored macrophage cells after removing fatty acids from the surrounding environment, observing a reduction in fatty acid content of the cells over the following 48 hours, showing that even heavily lipid-laden macrophages can process these excess lipids once fatty acids are removed from the environment.

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Adany, R., A. Kiss, J. Kappelmayer, R. J. Ablin et L. Muszbek. « EXPRESSION OF FACTOR XIII SUBUNIT A IN DIFFERENT TYPES OF HUMAN MACROPHAGES ». Dans XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1644651.

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In addition to plasma the presence of subunit a of blood coagulation Factor XIII (FXIIl) has been verified in platelets and megakariocytes. Most recently, we demonstrated that human peripheral blood monocytes also contain FXIII subunit a. The present study was designed 1/ to determine the stage in the maturation sequence of bone marrow monocytopoesis in which FXIII appears 2/ to establish if FXIII is retained during differentiation into macrophages 3/ to assess how general is the presence of FXIII subunit a in different types of macrophages. FXIII subunit a was immunomorphologically detected in bone marrow smears, in cytospin preparations of cells from serous cavities (pleural, peritoneal, pericardial and synovial spaces), and paraformaldehyde-fixed paraffin-embedded or frozen sections of different organs where classical types of macrophages have been described earlier (liver, lung, thymus, skin, connective tissue, prostate and developing bone) . Cells containing FXIII subunit a were intensively characterized by immunofluorescent and enzymecytochemical techniques in double and treble labeling systems. Its presence was clearly demonstrated in promonocytes of bone marrow, and in all probability, it is present in monoblasts, as well. FXIII was also found in macrophages from different serous cavities and in embryonic osteoclasts. Cells containing FXIII subunit a of connective tissue were found to be tissue histiocytes, and not fibroblasts as previously thought. Kupffer cells of the liver and Langerhans cells of the epidermis were negative supporting theories that these cells are not members of monocyte-derived macrophage cell population. Immunomorphological detection of FXIII subunit a seems to be a useful marker for labeling the continuum of monocyte/macrophage cell line from the earliest ftrais in the bone marrow to the mature forms of macrophages and might be a valuable tool in the cytological diagnosis of malignant disorders of this cell line.

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Muszbek, L., et R. Adány. « CELLULAR DISTIBUTION OF FACTOR XIII IN HUMAN UTERUS AND PLACENTA ». Dans XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1644648.

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As spontaneous abortion is a frequent finding in females with Factor XIII (FXIIl) deficiency it has been presumed that the plasmatic or cellular form of this clotting factor is essential to normal fetus development. In this context it is of special interestthat FXIII subunit a has been demonstrated in the homoge-nate of human uterus and placenta by activity measurements and immunobiochemical methods. However, no information on its cellular distribution has beenpublished, so far. In the present study first FXIII subunit a was detected in paraformaldehyde-fixed, paraffin-embedded sections by immunoperoxidase technique. FXIII containing cells were localized in the connective tissue of uterus and in the mesenchyme of placental chorionic villi. Though in a single report FXIII containing connective tissue cells were interpreted as fibroblasts (Fear et al., J.Clin.Pathoi.,37,560, 1984) the mononuclear, multipolar, stellate morphological appearance of these cells suggested that they rather belong to the monocyte/macrophage cell line. To characterize them the immuno-fluorescent detection of FXIII subunit a was combined by the visualization of different marker antigens for tissue macrophages (RFDT, Leu M3, HLA-DR) and fibroblasts (IIG10) on frozen sections. The coexpression of FXIII subunit a with RFD7 and Leu M3 macrophage markers, butnot with fibroblast membrane antigen IIG10 clearly proves that FXIII containing cells both in the uterusand in the placenta are tissue macrophages. HLA-DR was strongly expressed in cells positive for FXIII subunit a. in the uterus, but not or only very weakly in the placental mesenchyme, which might be due to the relative absence of extrinsic antigens during fetal development. The morphological findings on the presence of FXIII subunit a in placental macrophages were further strengthened by immunobiochemical experiments. FXIII subunit a, but not b content of isolated placental macrophages was also verified by immunoblotting, while fibroblasts were shown to be exemptof this factor. The results well agree with our previous findings demonstrating FXIII subunit a in humanmonocytes and peritoneal macrophages (Muszbek et al., Thrombos. Res. ,37, 401,1985; Adány et al. , Eur.J.Cell Biol.,38,171,1985).

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Nikishina, M. A., S. P. Fedotov, E. V. Fedotov et V. Fedotov. « STATISTICAL ANALYSIS OF NANOPARTICLE UPTAKE BY CELLS ». Dans XI МЕЖДУНАРОДНАЯ КОНФЕРЕНЦИЯ МОЛОДЫХ УЧЕНЫХ : БИОИНФОРМАТИКОВ, БИОТЕХНОЛОГОВ, БИОФИЗИКОВ, ВИРУСОЛОГОВ, МОЛЕКУЛЯРНЫХ БИОЛОГОВ И СПЕЦИАЛИСТОВ ФУНДАМЕНТАЛЬНОЙ МЕДИЦИНЫ. IPC NSU, 2024. https://doi.org/10.25205/978-5-4437-1691-6-31.

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Experimental data on nanoparticle uptake by rat alveolar macrophages were analyzed. The distribution of pits on the surface of a single macrophage was statistically analyzed based on a limited sample of 100 and 200 subregions. It was shown that the negative binomial distribution provides a more accurate model for experimentally observed pits on the surface of a single cell.

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Belchamber, K., et E. Sapey. « S51 Hungry hungry macrophages : how multiple prey affects macrophage phagocytosis ». Dans British Thoracic Society Winter Meeting, Wednesday 17 to Friday 19 February 2021, Programme and Abstracts. BMJ Publishing Group Ltd and British Thoracic Society, 2021. http://dx.doi.org/10.1136/thorax-2020-btsabstracts.56.

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Rapports d'organisations sur le sujet "Macrophages"

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Havell, Edward A. Actions of Interferons on Macrophages. Fort Belvoir, VA : Defense Technical Information Center, juin 1985. http://dx.doi.org/10.21236/ada157006.

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Naftolin, Frederick. Macrophages, Estrogen and the Microenvironment in Breast Cancer. Fort Belvoir, VA : Defense Technical Information Center, septembre 1999. http://dx.doi.org/10.21236/ada383077.

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Benson, J. M., K. J. Nikula et R. A. Guilmette. Evidence for particle transport between alveolar macrophages in vivo. Office of Scientific and Technical Information (OSTI), décembre 1995. http://dx.doi.org/10.2172/381362.

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Shpigel, Nahum, Raul Barletta, Ilan Rosenshine et Marcelo Chaffer. Identification and characterization of Mycobacterium paratuberculosis virulence genes expressed in vivo by negative selection. United States Department of Agriculture, janvier 2004. http://dx.doi.org/10.32747/2004.7696510.bard.

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Mycobacterium avium subsp. paratuberculosis (MAP) is the etiological agent of a severe inflammatory bowel disease (IBD) in ruminants, known as Johne’s disease or paratuberculosis. Johne’s disease is considered to be one of the most serious diseases affecting dairy cattle both in Israel and worldwide. Heavy economic losses are incurred by dairy farmers due to the severe effect of subclinical infection on milk production, fertility, lower disease resistance and early culling. Its influence in the United States alone is staggering, causing an estimated loss of $1.5 billion to the agriculture industry every year. Isolation of MAP from intestinal tissue and blood of Crohn's patients has lead to concern that it plays a potential pathogenic role in promoting human IDB including Crohn’s disease. There is great concern following the identification of the organism in animal products and shedding of the organism to the environment by subclinically infected animals. Little is known about the molecular basis for MAP virulence. The goal of the original proposed research was to identify MAP genes that are required for the critical stage of initial infection and colonization of ruminants’ intestine by MAP. We proposed to develop and use signature tag mutagenesis (STM) screen to find MAP genes that are specifically required for survival in ruminants upon experimental infection. This research projected was approved as one-year feasibility study to prove the ability of the research team to establish the animal model for mutant screening and alternative in-vitro cell systems. In Israel, neonatal goat kids were repeatedly inoculated with either one of the following organisms; MAP K-10 strain and three transposon mutants of K-10 which were produced and screened by the US PI. Six months after the commencement of inoculation we have necropsied the goats and taken multiple tissue samples from the jejunum, ileum and mesenteric lymph nodes. Both PCR and histopathology analysis indicated on efficient MAP colonization of all the inoculated animals. We have established several systems in the Israeli PI’s laboratory; these include using IS900 PCR for the identification of MAP and using HSP65-based PCR for the differentiation between MAV and MAP. We used Southern blot analysis for the differentiation among transposon mutants of K-10. In addition the Israeli PI has set up a panel of in-vitro screening systems for MAP mutants. These include assays to test adhesion, phagocytosis and survival of MAP to/within macrophages, assays that determine the rate of MAPinduced apoptosis of macrophages and MAP-induced NO production by macrophages, and assays testing the interference with T cell ã Interferon production and T cell proliferation by MAP infected macrophages (macrophage studies were done in BoMac and RAW cell lines, mouse peritoneal macrophages and bovine peripheral blood monocytes derived macrophages, respectively). All partners involved in this project feel that we are currently on track with this novel, highly challenging and ambitious research project. We have managed to establish the above described research systems that will clearly enable us to achieve the original proposed scientific objectives. We have proven ourselves as excellent collaborative groups with very high levels of complementary expertise. The Israeli groups were very fortunate to work with the US group and in a very short time period to master numerous techniques in the field of Mycobacterium research. The Israeli group has proven its ability to run this complicated animal model. This research, if continued, may elucidate new and basic aspects related to the pathogenesis MAP. In addition the work may identify new targets for vaccine and drug development. Considering the possibility that MAP might be a cause of human Crohn’s disease, better understanding of virulence mechanisms of this organism might also be of public health interest as well.

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Yull, Fiona. NF-kappaB Activity in Macrophages Determines Metastatic Potential of Breast Tumor Cells. Fort Belvoir, VA : Defense Technical Information Center, août 2010. http://dx.doi.org/10.21236/ada541379.

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Nelson, Corwin, Donald C. Beitz, Tim Reinhardt et John Lippolis. Toll-Like Receptor Signaling in Bovine Macrophages Increases 1,25-Dihydroxyvitamin D3 Production. Ames (Iowa) : Iowa State University, janvier 2008. http://dx.doi.org/10.31274/ans_air-180814-482.

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Yull, Fiona. NF-kappaB Activity in Macrophages Determines Metastatic Potential of Breast Tumor Cells. Fort Belvoir, VA : Defense Technical Information Center, août 2011. http://dx.doi.org/10.21236/ada554014.

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Adiga, Umesh, Brian Bell, Larissa Ponomareva, Sandra Nelson, Stephen Kanzleman, Debbie Taylor, Ryan Kramer et Thomas Lamkin. Automated Analysis and Classification of Infected Macrophages Using Bright-Field Amplitude Contrast Data. Fort Belvoir, VA : Defense Technical Information Center, août 2012. http://dx.doi.org/10.21236/ada578711.

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Kim, Isaac. Neuroendocrine Differentiation in Prostate Cancer : Role of Bone Morphogenetic Protein-6 and Macrophages. Fort Belvoir, VA : Defense Technical Information Center, juillet 2011. http://dx.doi.org/10.21236/ada555480.

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Splitter, Gary, et Menachem Banai. Microarray Analysis of Brucella melitensis Pathogenesis. United States Department of Agriculture, 2006. http://dx.doi.org/10.32747/2006.7709884.bard.

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Original Objectives 1. To determine the Brucella genes that lead to chronic macrophage infection. 2. To identify Brucella genes that contribute to infection. 3. To confirm the importance of Brucella genes in macrophages and placental cells by mutational analysis. Background Brucella spp. is a Gram-negative facultative intracellular bacterium that infects ruminants causing abortion or birth of severely debilitated animals. Brucellosis continues in Israel, caused by B. melitensis despite an intensive eradication campaign. Problems with the Rev1 vaccine emphasize the need for a greater understanding of Brucella pathogenesis that could improve vaccine designs. Virulent Brucella has developed a successful strategy for survival in its host and transmission to other hosts. To invade the host, virulent Brucella establishes an intracellular niche within macrophages avoiding macrophage killing, ensuring its long-term survival. Then, to exit the host, Brucella uses placenta where it replicates to high numbers resulting in abortion. Also, Brucella traffics to the mammary gland where it is secreted in milk. Missing from our understanding of brucellosis is the surprisingly lillie basic information detailing the mechanisms that permit bacterial persistence in infected macrophages (chronic infection) and dissemination to other animals from infected placental cells and milk (acute infection). Microarray analysis is a powerful approach to determine global gene expression in bacteria. The close genomic similarities of Brucella species and our recent comparative genomic studies of Brucella species using our B. melitensis microarray, suqqests that the data obtained from studying B. melitensis 16M would enable understanding the pathogenicity of other Brucella organisms, particularly the diverse B. melitensis variants that confound Brucella eradication in Israel. Conclusions Results from our BARD studies have identified previously unknown mechanisms of Brucella melitensis pathogenesis- i.e., response to blue light, quorum sensing, second messenger signaling by cyclic di-GMP, the importance of genomic island 2 for lipopolysaccharide in the outer bacterial membrane, and the role of a TIR domain containing protein that mimics a host intracellular signaling molecule. Each one of these pathogenic mechanisms offers major steps in our understanding of Brucella pathogenesis. Strikingly, our molecular results have correlated well to the pathognomonic profile of the disease. We have shown that infected cattle do not elicit antibodies to the organisms at the onset of infection, in correlation to the stealth pathogenesis shown by a molecular approach. Moreover, our field studies have shown that Brucella exploit this time frame to transmit in nature by synchronizing their life cycle to the gestation cycle of their host succumbing to abortion in the last trimester of pregnancy that spreads massive numbers of organisms in the environment. Knowing the bacterial mechanisms that contribute to the virulence of Brucella in its host has initiated the agricultural opportunities for developing new vaccines and diagnostic assays as well as improving control and eradication campaigns based on herd management and linking diagnosis to the pregnancy status of the animals. Scientific and Agricultural Implications Our BARD funded studies have revealed important Brucella virulence mechanisms of pathogenesis. Our publication in Science has identified a highly novel concept where Brucella utilizes blue light to increase its virulence similar to some plant bacterial pathogens. Further, our studies have revealed bacterial second messengers that regulate virulence, quorum sensing mechanisms permitting bacteria to evaluate their environment, and a genomic island that controls synthesis of its lipopolysaccharide surface. Discussions are ongoing with a vaccine company for application of this genomic island knowledge in a Brucella vaccine by the U.S. lab. Also, our new technology of bioengineering bioluminescent Brucella has resulted in a spin-off application for diagnosis of Brucella infected animals by the Israeli lab by prioritizing bacterial diagnosis over serological diagnosis.

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