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Artykuły w czasopismach na temat "Muscle stem cell"
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Liu, Qi, Su Pan, Shijie Liu, Sui Zhang, James T. Willerson, James F. Martin, and Richard A. F. Dixon. "Suppressing Hippo signaling in the stem cell niche promotes skeletal muscle regeneration." Stem Cells 39, no. 6 (February 18, 2021): 737–49. http://dx.doi.org/10.1002/stem.3343.
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Abstract Lack of blood flow to the lower extremities in peripheral arterial disease causes oxygen and nutrient deprivation in ischemic skeletal muscles, leading to functional impairment. Treatment options for muscle regeneration in this scenario are lacking. Here, we selectively targeted the Hippo pathway in myofibers, which provide architectural support for muscle stem cell niches, to facilitate functional muscle recovery in ischemic extremities by promoting angiogenesis, neovascularization, and myogenesis. We knocked down the core Hippo pathway component, Salvador (SAV1), by using an adeno-associated virus 9 (AAV9) vector expressing a miR30-based triple short-hairpin RNA (shRNA), controlled by a muscle-specific promoter. In a mouse hindlimb-ischemia model, AAV9 SAV1 shRNA administration in ischemic muscles induced nuclear localization of the Hippo effector YAP, accelerated perfusion restoration, and increased exercise endurance. Intravascular lectin labeling of the vasculature revealed enhanced angiogenesis. Using 5-ethynyl-2′-deoxyuridine to label replicating cellular DNA in vivo, we found SAV1 knockdown concurrently increased paired box transcription factor Pax7+ muscle satellite cell and CD31+ endothelial cell proliferation in ischemic muscles. To further study Hippo suppression in skeletal muscle regeneration, we used a cardiotoxin-induced muscle damage model in adult (12-15 weeks old) and aged mice (26-month old). Two weeks after delivery of AAV9 SAV1 shRNA into injured muscles, the distribution of regenerative myofibers shifted toward a larger cross-sectional area and increased capillary density compared with mice receiving AAV9 control. Together, these findings suggest our approach may have clinical promise in regenerative therapy for leg ischemia and muscle injury.
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Wang, Shuaiyu, Bao Zhang, Gregory C. Addicks, Hui Zhang, Keir J. Menzies, and Hongbo Zhang. "Muscle Stem Cell Immunostaining." Current Protocols in Mouse Biology 8, no. 3 (August 14, 2018): e47. http://dx.doi.org/10.1002/cpmo.47.
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Yin, Hang, Feodor Price, and Michael A. Rudnicki. "Satellite Cells and the Muscle Stem Cell Niche." Physiological Reviews 93, no. 1 (January 2013): 23–67. http://dx.doi.org/10.1152/physrev.00043.2011.
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Adult skeletal muscle in mammals is a stable tissue under normal circumstances but has remarkable ability to repair after injury. Skeletal muscle regeneration is a highly orchestrated process involving the activation of various cellular and molecular responses. As skeletal muscle stem cells, satellite cells play an indispensible role in this process. The self-renewing proliferation of satellite cells not only maintains the stem cell population but also provides numerous myogenic cells, which proliferate, differentiate, fuse, and lead to new myofiber formation and reconstitution of a functional contractile apparatus. The complex behavior of satellite cells during skeletal muscle regeneration is tightly regulated through the dynamic interplay between intrinsic factors within satellite cells and extrinsic factors constituting the muscle stem cell niche/microenvironment. For the last half century, the advance of molecular biology, cell biology, and genetics has greatly improved our understanding of skeletal muscle biology. Here, we review some recent advances, with focuses on functions of satellite cells and their niche during the process of skeletal muscle regeneration.
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Kodaka, Yusaku, Gemachu Rabu, and Atsushi Asakura. "Skeletal Muscle Cell Induction from Pluripotent Stem Cells." Stem Cells International 2017 (2017): 1–16. http://dx.doi.org/10.1155/2017/1376151.
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Embryonic stem cells (ESCs) and induced pluripotent stem cells (iPSCs) have the potential to differentiate into various types of cells including skeletal muscle cells. The approach of converting ESCs/iPSCs into skeletal muscle cells offers hope for patients afflicted with the skeletal muscle diseases such as the Duchenne muscular dystrophy (DMD). Patient-derived iPSCs are an especially ideal cell source to obtain an unlimited number of myogenic cells that escape immune rejection after engraftment. Currently, there are several approaches to induce differentiation of ESCs and iPSCs to skeletal muscle. A key to the generation of skeletal muscle cells from ESCs/iPSCs is the mimicking of embryonic mesodermal induction followed by myogenic induction. Thus, current approaches of skeletal muscle cell induction of ESCs/iPSCs utilize techniques including overexpression of myogenic transcription factors such as MyoD or Pax3, using small molecules to induce mesodermal cells followed by myogenic progenitor cells, and utilizing epigenetic myogenic memory existing in muscle cell-derived iPSCs. This review summarizes the current methods used in myogenic differentiation and highlights areas of recent improvement.
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Memczak, Sebastian, and Juan CI Belmonte. "Overcoming muscle stem cell aging." Current Opinion in Genetics & Development 83 (December 2023): 102127. http://dx.doi.org/10.1016/j.gde.2023.102127.
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Ishii, Kana, Nobuharu Suzuki, Yo Mabuchi, Naoki Ito, Naomi Kikura, So-ichiro Fukada, Hideyuki Okano, Shin'ichi Takeda, and Chihiro Akazawa. "Muscle Satellite Cell Protein Teneurin-4 Regulates Differentiation During Muscle Regeneration." STEM CELLS 33, no. 10 (June 28, 2015): 3017–27. http://dx.doi.org/10.1002/stem.2058.
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Torrente, Yuan, Jacques-P. Tremblay, Federica Pisati, Marzia Belicchi, Barbara Rossi, Manuela Sironi, Franco Fortunato, et al. "Intraarterial Injection of Muscle-Derived Cd34+Sca-1+ Stem Cells Restores Dystrophin in mdx Mice." Journal of Cell Biology 152, no. 2 (January 22, 2001): 335–48. http://dx.doi.org/10.1083/jcb.152.2.335.
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Duchenne muscular dystrophy is a lethal recessive disease characterized by widespread muscle damage throughout the body. This increases the difficulty of cell or gene therapy based on direct injections into muscles. One way to circumvent this obstacle would be to use circulating cells capable of homing to the sites of lesions. Here, we showed that stem cell antigen 1 (Sca-1), CD34 double-positive cells purified from the muscle tissues of newborn mice are multipotent in vitro and can undergo both myogenic and multimyeloid differentiation. These muscle-derived stem cells were isolated from newborn mice expressing the LacZ gene under the control of the muscle-specific desmin or troponin I promoter and injected into arterial circulation of the hindlimb of mdx mice. The ability of these cells to interact and firmly adhere to endothelium in mdx muscles microcirculation was demonstrated by intravital microscopy after an intraarterial injection. Donor Sca-1, CD34 muscle-derived stem cells were able to migrate from the circulation into host muscle tissues. Histochemical analysis showed colocalization of LacZ and dystrophin expression in all muscles of the injected hindlimb in all of five out of five 8-wk-old treated mdx mice. Their participation in the formation of muscle fibers was significantly increased by muscle damage done 48 h after their intraarterial injection, as indicated by the presence of 12% β-galactosidase–positive fibers in muscle cross sections. Normal dystrophin transcripts detected enzymes in the muscles of the hind limb injected intraarterially by the mdx reverse transcription polymerase chain reaction method, which differentiates between normal and mdx message. Our results showed that the muscle-derived stem cells first attach to the capillaries of the muscles and then participate in regeneration after muscle damage.
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Borok, Matthew, Nathalie Didier, Francesca Gattazzo, Teoman Ozturk, Aurelien Corneau, Helene Rouard, and Frederic Relaix. "Progressive and Coordinated Mobilization of the Skeletal Muscle Niche throughout Tissue Repair Revealed by Single-Cell Proteomic Analysis." Cells 10, no. 4 (March 28, 2021): 744. http://dx.doi.org/10.3390/cells10040744.
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Background: Skeletal muscle is one of the only mammalian tissues capable of rapid and efficient regeneration after trauma or in pathological conditions. Skeletal muscle regeneration is driven by the muscle satellite cells, the stem cell population in interaction with their niche. Upon injury, muscle fibers undergo necrosis and muscle stem cells activate, proliferate and fuse to form new myofibers. In addition to myogenic cell populations, interaction with other cell types such as inflammatory cells, mesenchymal (fibroadipogenic progenitors—FAPs, pericytes) and vascular (endothelial) lineages are important for efficient muscle repair. While the role of the distinct populations involved in skeletal muscle regeneration is well characterized, the quantitative changes in the muscle stem cell and niche during the regeneration process remain poorly characterized. Methods: We have used mass cytometry to follow the main muscle cell types (muscle stem cells, vascular, mesenchymal and immune cell lineages) during early activation and over the course of muscle regeneration at D0, D2, D5 and D7 compared with uninjured muscles. Results: Early activation induces a number of rapid changes in the proteome of multiple cell types. Following the induction of damage, we observe a drastic loss of myogenic, vascular and mesenchymal cell lineages while immune cells invade the damaged tissue to clear debris and promote muscle repair. Immune cells constitute up to 80% of the mononuclear cells 5 days post-injury. We show that muscle stem cells are quickly activated in order to form new myofibers and reconstitute the quiescent muscle stem cell pool. In addition, our study provides a quantitative analysis of the various myogenic populations during muscle repair. Conclusions: We have developed a mass cytometry panel to investigate the dynamic nature of muscle regeneration at a single-cell level. Using our panel, we have identified early changes in the proteome of stressed satellite and niche cells. We have also quantified changes in the major cell types of skeletal muscle during regeneration and analyzed myogenic transcription factor expression in satellite cells throughout this process. Our results highlight the progressive dynamic shifts in cell populations and the distinct states of muscle stem cells adopted during skeletal muscle regeneration. Our findings give a deeper understanding of the cellular and molecular aspects of muscle regeneration.
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Wagers, Amy J. "Stem Cell Rejuvenation." Blood 124, no. 21 (December 6, 2014): SCI—42—SCI—42. http://dx.doi.org/10.1182/blood.v124.21.sci-42.sci-42.
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Effective functioning of the body’s tissues and organs depends upon innate regenerative processes that maintain proper cell numbers during homeostasis and replace damaged cells after injury. In many tissues, regenerative potential is determined by the presence and functionality of dedicated populations of stem and progenitor cells, which respond to exogenous cues to produce replacement cells when needed. Understanding how these unspecialized precursors are maintained and regulated is essential for understanding the fundamental biology of tissues. In addition, this knowledge has practical implications, as stem cell regenerative potential can be exploited therapeutically by transplantation to replenish the stem cell pool or by pharmacological manipulation to boost the repair activity of cells already present in the tissue. Ongoing work in my laboratory focuses on defining how changes in stem cell activity impact tissue regeneration throughout life, and identifying physiological and pathological signals that modulate regenerative function in an age-dependent manner. Our recent data using parabiosis and transplantation models suggests that the circulatory system serves as a major source of such signals. In particular, exposure of aged tissues, including skeletal muscle, cardiac muscle and neural cells, to a “youthful” systemic environment appears to reverse many indicators of age-related pathology and restores robust regeneration following injury. While prior studies have identified a handful of systemic “aging” factors, discovery of the humoral “rejuvenating” factors that act on tissue stem cells to restore regenerative function has been relatively more elusive. In recent work, we identified that the circulating hormone Growth Differentiation Factor 11 (GDF11) is a rejuvenating factor for skeletal muscle and other tissues. Supplementation of systemic GDF11 levels, which normally decline with age in mice and humans, was sufficient to restore stem cell function in the skeletal muscle and other tissues, and improved physical function in aged mice. Taken together, these data reveal critical mechanisms in the regulation of aging by blood-borne factors and identify a promising therapeutic target candidate for the reversal of age-related tissue and stem cell dysfunction. Disclosures No relevant conflicts of interest to declare.
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Heslop, L., J. E. Morgan, and T. A. Partridge. "Evidence for a myogenic stem cell that is exhausted in dystrophic muscle." Journal of Cell Science 113, no. 12 (June 15, 2000): 2299–308. http://dx.doi.org/10.1242/jcs.113.12.2299.
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Injection of the myotoxin notexin, was found to induce regeneration in muscles that had been subjected to 18 Gy of radiation. This finding was unexpected as irradiation doses of this magnitude are known to block regeneration in dystrophic (mdx) mouse muscle. To investigate this phenomenon further we subjected mdx and normal (C57Bl/10) muscle to irradiation and notexin treatment and analysed them in two ways. First by counting the number of newly regenerated myofibres expressing developmental myosin in cryosections of damaged muscles. Second, by isolating single myofibres from treated muscles and counting the number of muscle precursor cells issuing from these over 2 day and 5 day periods. After irradiation neither normal nor dystrophic muscles regenerate to any significant extent. Moreover, single myofibres cultured from such muscles produce very few muscle precursor cells and these undergo little or no proliferation. However, when irradiated normal and mdx muscles were subsequently treated with notexin, regeneration was observed. In addition, some of the single myofibres produced rapidly proliferative muscle precursor cells when cultured. This occurred more frequently, and the myogenic cells proliferated more extensively, with fibres cultured from normal compared with dystrophic muscles. Even after 25 Gy, notexin induced some regeneration but no proliferative myogenic cells remained associated with the muscle fibres. Thus, skeletal muscles contain a number of functionally distinct populations of myogenic cells. Most are radiation sensitive. However, some survive 18 Gy as proliferative myogenic cells that can be evoked by extreme conditions of muscle damage; this population is markedly diminished in muscles of the mdx mouse. A small third population survives 25 Gy and forms muscle but not proliferative myogenic cells.
Rozprawy doktorskie na temat "Muscle stem cell"
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Woodhouse, Samuel. "The role of Ezh2 in adult muscle stem cell fate." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610201.
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Theret, Marine. "Cell and non-cell autonomous regulations of metabolism on muscle stem cell fate and skeletal muscle homeostasis." Thesis, Sorbonne Paris Cité, 2015. http://www.theses.fr/2015USPCB120/document.
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A l’état basal, les cellules souches musculaires sont quiescentes. Après blessure, ces cellules s’activent, s’amplifient et se différencient afin de réparer les myofibres lésées. Cependant, une petite population de ces cellules myogéniques activées ne va pas entrer dans la voie de la myogenèse, mais va retourner en quiescence par un phénomène appelé auto-renouvellement. Cette étape est cruciale afin de maintenir une réserve de cellules souches musculaires tout au long de la vie. Mais, les mécanismes cellulaires et moléculaires régulant ce phénomène sont peu décrits dans la littérature. La régénération musculaire est composée d’une série d’évènements complexes et bien orchestrés selon une cinétique précise. Le challenge de son étude est donc de pouvoir distinguer les évènements les uns des autres, tout en sachant qu’ils sont interconnectés. Bien que les cellules souches musculaires aient un fort potentiel de régénération, elles ont besoin d’interagir avec d’autres cellules au cours de la régénération, notamment avec les macrophages qui ont un rôle prépondérant dans ce processus. Après une blessure, les monocytes circulants sont recrutés sur le site de lésion et se différencient en macrophages inflammatoires. Ensuite, ces macrophages changent leur statut inflammatoire et acquièrent un profil anti-inflammatoire. Plusieurs études in vitro ont suggéré un rôle pour le métabolisme et son régulateur principal, la kinase activée par l’AMP (AMPK), dans la résolution de l’inflammation et dans le devenir des cellules souches adultes. Ainsi, j’ai étudié l’influence extrinsèque (via les macrophages) et intrinsèque du métabolisme sur le devenir des cellules souches musculaires au cours de la régénération. Pour cela, j’ai utilisé divers modèles déficients pour l’AMPK1 dans le macrophage, dans la cellule souche musculaire et dans la myofibre qui m’ont permis d’établir des cultures primaires de macrophages et de cellules musculaires. Dans un premier temps, grâce à ces outils, nous avons pu démontrer le rôle primordial de l’AMPK dans la résolution de l’inflammation au cours de la régénération musculaire et dans l’acquisition des fonctions anti-inflammatoires des macrophages. Dans ce contexte, l’activation de l’AMPK est dépendante de la kinase CAMKK et régule la phagocytose, principal phénomène cellulaire permettant le changement de statut inflammatoire des macrophages. Ce travail a été publié en 2013 dans le journal Cell Metabolism. Ensuite, j’ai mis en évidence un lien entre le métabolisme et le devenir des cellules souches musculaires. La suppression de l’AMPK dans les cellules souches musculaires augmente leur auto-renouvellement. Cette modification du devenir des cellules souches est due à un changement de métabolisme similaire à l’effet Warburg observé dans les cellules souches cancéreuses, qui s’effectue via la modulation de l’activité de l’enzyme Lactate Déshydrogénase, enzyme clé de la glycolyse. En conclusion, j’ai pu mettre en évidence deux nouveaux rôles de l’AMPK dans le devenir des cellules souches musculaires, établissant un lien de causalité entre métabolisme, inflammation et devenir des cellules souches<br>During skeletal muscle regeneration, muscle stem cells activate and recapitulate the myogenic program to repair the damaged myofibers. A subset of these cells does not enter into the myogenesis program but self-renews to return into quiescence for further needs. Control of muscle stem cell fate choice is crucial to maintain homeostasis but molecular and cellular mechanisms controlling this step are poorly understood. A difficulty of understanding muscle stem cell self-renewal is that skeletal muscle regeneration is a coordinated and non-synchronized process. Various and dissociated molecular and cellular mechanisms regulate muscle stem cell fate. Indeed, skeletal muscle regeneration requires the interaction between myogenic cells and other cell types, among which the macrophages. Macrophages infiltrate the muscle and adopt distinct and sequential phenotypes. They act on the sequential phases of muscle regeneration and resolving the inflammation by skewing their inflammatory profile to an anti-inflammatory state. Some in vitro studies suggested a role for the metabolism and the AMP-activated protein Kinase (AMPK), the master metabolic regulator of cells, in both inflammation and stem cell fate. Thus, I investigated the role of metabolism on muscle stem cell fate within the muscle stem cells (cell autonomous regulations) and through the action of macrophages (non-cell autonomous regulations) during skeletal muscle regeneration. To analyze muscle stem cell fate, I used in vitro (macrophages and muscle stem cell primary cultures), ex vivo (isolated myofibers) and in vivo (using specific mice model deleted specifically for AMPK1 in the myeloid lineage, in muscle stem cells or in myofibers) experiments. First, I highlighted that macrophagic AMPK1is required for the resolution of inflammation during skeletal muscle regeneration and for the trophic functions of macrophages on muscle stem cell fate. Moreover, CAMKK-AMPK1 activation regulates phagocytosis, which is the main cellular mechanism inducing macrophage skewing. This work was published in 2013 in Cell Metabolism. Second, I demonstrated that depletion of myogenic AMPK1 tailors muscle stem cell metabolism in a LKB1 independent manner, orients their fate to the self-renewal by promoting metabolic switch from an oxidative to a glycolytic metabolism pathway, through the over activation of a new molecular target, which is a key enzyme for glycolysis: the Lactate Dehydrogenase. To conclude, during my thesis, I established two new crucial roles of AMPK1 in muscle stem cell fate choice, linking for the first time metabolism, inflammation and fate choice
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Wang, Yu Xin. "Molecular Regulation of Muscle Stem Cell Self-Renewal." Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/35207.
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Muscle stem cells self-renew to maintain the long-term capacity for skeletal muscles to regenerate. However, the homeostatic regulation of muscle stem cell self-renewal is poorly understood. By utilizing high-throughput screening and transcriptomic approaches, we identify the critical function of dystrophin, the epidermal growth factor receptor (EGFR), and fibronectin in the establishment of cell polarity and in determining symmetric and asymmetric modes of muscle stem cell self-renewal. These findings reveal an orchestrated network of paracrine signaling that regulate muscle stem cell homeostasis during regeneration and have profound implications for the pathogenesis and development of therapies for Duchenne muscular dystrophy.
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Victor, Pedro Sousa. "Skeletal muscle aging: stem cell function and tissue homeostasis." Doctoral thesis, Universitat Pompeu Fabra, 2012. http://hdl.handle.net/10803/81933.
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Muscle aging, in particular, is characterized by the reduction of tissue mass and function, which are particularly prominent in geriatric individuals undergoing sarcopenia. The age-associated muscle wasting is also associated with a decline in regenerative ability and a reduction in resident muscle stem cell (satellite cell) number and function. Although sarcopenia is one of the major contributors to the general loss of physiological function, the mechanisms involved in age-related loss of muscle homeostasis and satellite cell activity are yet poorly understood.
Using a microarray-based transcriptome analysis of muscle stem cells isolated from young and physiologically aged/geriatric mice, we uncovered specific changes in the gene expression profile that highlighted key biological processes and potential molecular markers associated with satellite cell aging, which included p16INK4a. We used Bmi1-deficient mice to further explore the implications of p16INK4a up-regulation in satellite cell function. We found premature p16INK4a up-regulation in young/adult Bmi1-deficient satellite cells correlating with defects in satellite cell number, proliferation and self-renewal capacity. In addition we have identified a number of overlapping biological processes dysregulated in physiologically aged and Bmi1-deficient satellite cells, suggesting that Bmi1-dependent epigenetic regulation may underlie many of the intrinsic changes taking place in chronologically aged satellite cells. In addition, we show that Bmi1 loss causes defects of late postnatal/adult muscle growth characterized by reduced muscle mass with smaller muscle fibers, typical of atrophying senescent/sarcopenic muscle. Since p16INK4a expression is specifically up-regulated in muscle satellite cells of geriatric, sarcopenic mice and in a mouse model of accelerated senescence/sarcopenia (SAMP8), we propose that the Bmi1/p16INK4a axis might be particularly operative in muscle stem cells from the elderly.
Muscle wasting is one of the physiological consequences of sarcopenia and the identification of novel factors regulating muscle growth and atrophy is of potential relevance for therapeutical applications. We have uncovered a new role for Sestrins as skeletal muscle growth promoting factors in the adult. We found Sestrins expression regulated in mouse models of skeletal muscle atrophy and hypertrophy and in human myopathies. Through a gain of function approach we show that Sestrins induce skeletal muscle growth, by activating the IGF1/PI3K/AKT pathway.<br>El envejecimiento del tejido muscular está caracterizado concretamente por una reducción global de la masa muscular y un empeoramiento de la función de tejido, particularmente prominentes en individuos muy viejos (geriátricos) que padecen sarcopenia. La pérdida muscular asociado a la edad, se acompaña de una reducción en la capacidad de regeneración del músculo y en una reducción del número y la función de las células madre residentes en el músculo (células satélite). Aunque la sarcopenia sea una de las causas principales de la pérdida general de función fisiológica del músculo, los mecanismos implicados en la reducción de la homeostasis muscular y de actividad de las células satélite no han sido completamente caracterizados.
Mediante el análisis comparativo del transcriptoma de células madre musculares aisladas de ratones jóvenes y de ratones viejos (geriátricos), hemos encontrado cambios específicos en su perfil de expresión génica que apuntan a los procesos biológicos dominantes y a los marcadores moleculares potencialmente asociados con el envejecimiento de las células satélite, entre los que destaca p16INK4a. Por ello, hemos utilizado ratones deficientes en Bmi1 para explorar más profundamente las implicaciones de la sobreexpresión de p16INK4a en la función de las células satélite. Hemos encontrado que células satélite jóvenes del ratón Bmi1-/- presentan sobrexpresión de p16INK4a, que correlacionan con una reducción en el número de la células, y en su capacidad de proliferación y autorenovación. Además hemos identificado un grupo de procesos biológicos comunes entre las células satélite viejas y las deficientes en Bmi1, sugiriendo que la regulación epigenética mediada por Bmi1 puede ser la base de muchos de los cambios intrínsecos que ocurren en células envejecidas fisiológicamente. Además, demostramos que la pérdida Bmi1 causa defectos en el crecimiento postnatal/adulto del músculo, caracterizado por pérdida de masa muscular con fibras más pequeñas, típico del músculo atrofiado senescente o sarcopénico. Puesto que la expresión de p16 está aumentada específicamente en el músculo de ratones viejos, sarcopénicos y en un modelo del ratón con envejecimiento (senescencia) acelerado (SAMP8), proponemos que el eje Bmi1/p16 puede actuar particularmente en las células madre musculares de los ancianos.
La pérdida de masa muscular es una de las consecuencias fisiológicas de la sarcopenia y la identificación de nuevos factores que regulen el crecimiento y atrofia del músculo es de gran importancia para aplicaciones terapéuticas. Hemos descubierto un nuevo papel de las Sestrinas como factores promotores del crecimiento del músculo esquelético en el adulto. Hemos encontrado que la expresión de las Sestrinas se regula en modelos del ratón de atrofia y de hipertrofia muscular y en miopatías humanas. Mediante experimentos de ganacia de función hemos demostrado que las Sestrinas inducen el crecimiento del músculo esquelético, activando el ruta de señalización de IGF1/PI3K/AKT
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Richards-Malcolm, Sonia Angela. "THE ROLE OF STEM CELL ANTIGEN-1(Sca-1) IN MUSCLE AGING." UKnowledge, 2008. http://uknowledge.uky.edu/gradschool_theses/519.
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Muscle aging is associated with a decrease in the number of satellite cells and their progeny, muscle progenitor cells (MPCs) that are available for muscle repair and regeneration. However, there is an increase in non-immuno-hematopoietic cells (CD45 negative) in regenerating muscle from aged mice characterized by high stem cell antigen -1(Sca-1) expression. In aged regenerating muscle, 14.2% of cells are CD45neg Sca-1pos while 7.2% of cells are CD45neg Sca-1pos in young adult muscle. In vitro, CD45neg Sca-1pos cells over express genes associated with fibrosis, potentially controlled by Wnt2. These cells are proliferative, non-myogenic and non-adipogenic, and arise in clonally-derived MPCs cultures from aged mice. Both in vitro and in vivo studies suggest that CD45neg Sca-1pos cells from aged muscle are more susceptible to apoptosis than their MPCs, which may contribute to depletion of the satellite cell pool. Therefore, with age, a subset of MPCs takes on an altered phenotype, which is marked by high Sca-1 expression. This altered phenotype prevents these cells from participating in muscle regeneration or replenishing the satellite cell pool, and instead may contribute to fibrosis in aged muscle.
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Feige, Peter. "Molecular Regulation of Satellite Cell Fate." Thesis, Université d'Ottawa / University of Ottawa, 2020. http://hdl.handle.net/10393/40804.
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Muscle homeostasis and regeneration are complex cellular processes orchestrated by muscle stem cells and their interaction with their stem cell microenvironment. The fate of a muscle stem cell is influenced by different conditions such as muscle injury, cold stress, or disease. During extensive muscle repair and in the context of muscular dystrophy, we identified the critical function of the Epidermal Growth Factor Receptor (EGFR) in establishing cell polarity and in turn the efficient formation of myogenic progeny able to repair muscle. Using a novel drug screen, we identified the p53 protein to regulate muscle stem cell fate decision to repress the formation of brown adipose tissue as a means to regulate whole-body metabolism. To increase the impact of our research we also optimized protocols evaluating mouse satellite cell transplantation to delineate stem cell hierarchy and developed a new paradigm to model human muscle stem cell fate to better translate our findings into the clinical arena. These findings reveal the tunable nature of stem cell fate decisions and highlight the development of research tools to accelerate the translation of research findings to improve human health.
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Pannerec, Alice. "The skeletal muscle stem cell niche : defining hierarchies based upon the stem cell marker PW1 to identify therapeutic target cells." Paris 6, 2012. http://www.theses.fr/2012PA066440.
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Les cellules satellites permettent la réparation des muscles squelettiques, mais chez les patients atteints de myopathies ces cellules ne fonctionnent pas correctement ce qui conduit à l’atrophie musculaire. Nos travaux ont montré qu’une nouvelle population de cellules souches musculaires, les PICs, favorisent la prolifération des cellules satellites par l’intermédiaire de la follistatine qui contrebalance l’effet négatif de la myostatine. Lorsque la myostatine est inactivée chez des souris par injection d’inhibiteur, le nombre de PICs augmente considérablement et les animaux présentent des muscles hypertrophiés. De récentes études ont montré que la régénération musculaire est impossible sans les cellules satellites, mais si nous inactivons la myostatine dans ces animaux la régénération musculaire est restaurée. Nous postulons que les PICs ont permis cette réparation et constituent donc une bonne cible pour des molécules pharmacologiques à visée thérapeutique<br>Satellite cells are considered the major source of muscle progenitors, however, other populations with myogenic popential have been discovered. We have identified a new muscle-resident non-satellite cell population, termed PICs, which can differentiate into three different lineages, skeletal muscle, smooth muscle and fat. PICs rescue satellite cells from myostatin inhibition in vitro through follistatin release. When myostatin is inactivated in vivo, PICs number is markedly increased and mice display hypertrophied muscles. While recent studies have demonstrated that muscle regeneration cannot occur without satellite cells, we show that muscle regeneration is restored when mice have been previously treated with a myostatin inhibitor. We postulate that PICs have participated in muscle repair rescue, and thus constitute an interesting population to be targeted for pharmaceutical strategies aimed at improving skeletal muscle mass and function
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Pannérec, Alice. "The skeletal muscle stem cell niche : defining hierarchies based upon the stem cell marker PW1 to identify therapeutic target cells." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2012. http://tel.archives-ouvertes.fr/tel-00833422.
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Les cellules satellites permettent la réparation des muscles squelettiques, mais chez les patients atteints de myopathies ces cellules ne fonctionnent pas correctement ce qui conduit à l'atrophie musculaire. Nos travaux ont montré qu'une nouvelle population de cellules souches musculaires, les PICs, favorisent la prolifération des cellules satellites par l'intermédiaire de la follistatine qui contrebalance l'effet négatif de la myostatine. Lorsque la myostatine est inactivée chez des souris par injection d'inhibiteur, le nombre de PICs augmente considérablement et les animaux présentent des muscles hypertrophiés. De récentes études ont montré que la régénération musculaire est impossible sans les cellules satellites, mais si nous inactivons la myostatine dans ces animaux la régénération musculaire est restaurée. Nous postulons que les PICs ont permis cette réparation et constituent donc une bonne cible pour des molécules pharmacologiques à visée thérapeutique
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Cahill, Kevin Scott. "Enhancement of stem-cell transplantation strategies for muscle regeneration." [Gainesville, Fla.] : University of Florida, 2003. http://purl.fcla.edu/fcla/etd/UFE0002319.
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Zhang, Ting [Verfasser]. "Epigenetic regulation of muscle stem cell expansion / Ting Zhang." Gießen : Universitätsbibliothek, 2015. http://d-nb.info/1076980325/34.
Pełny tekst źródłaKsiążki na temat "Muscle stem cell"
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A, Sassoon D., ed. Stem cells and cell signalling in skeletel myogenesis. Amsterdam: Elsevier, 2002.
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Perdiguero, Eusebio, and DDW Cornelison, eds. Muscle Stem Cells. New York, NY: Springer New York, 2017. http://dx.doi.org/10.1007/978-1-4939-6771-1.
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Asakura, Atsushi, ed. Skeletal Muscle Stem Cells. New York, NY: Springer US, 2023. http://dx.doi.org/10.1007/978-1-0716-3036-5.
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Sassoon, D. A. Stem Cells and Cell Signalling in Skeletal Myogenesis (Advances in Developmental Biology and Biochemistry, V. 11). Elsevier Science, 2002.
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Bonnie Fagan, Melinda. Individuality, Organisms, and Cell Differentiation. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780190636814.003.0006.
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This chapter builds on earlier arguments concerning the individuality of stem cells. The author has argued in previous work that stem cells are not biological individuals in the same way as specialized cells of multicellular organisms (e.g., neurons, red blood cells, muscle cells) but that some stem cells (cultured pluripotent stem cells) can be considered biological individuals by analogy with multicellular organisms. More precisely, the author claims that cultured pluripotent stem cells can be considered model organisms for studying early mammalian development. An important objection to this model organism thesis is that cultured pluripotent stem cells lack the organization (functional integration and cohesive unity) required for an entity to be an organism. This chapter explicates and rebuts a strong version of this objection and, in the process, clarifies the ontology of stem cells as experimental entities.
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Rudnicki, Michael, and Jeffrey Dilworth. Muscle Stem Cells. Elsevier Science & Technology Books, 2024.
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Perdiguero, Eusebio, and Dawn Cornelison. Muscle Stem Cells: Methods and Protocols. Springer New York, 2017.
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Perdiguero, Eusebio, and D. D. W. Cornelison. Muscle Stem Cells: Methods and Protocols. Springer New York, 2018.
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Douglas, Kenneth. Bioprinting. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780190943547.001.0001.
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Abstract: This book describes how bioprinting emerged from 3D printing and details the accomplishments and challenges in bioprinting tissues of cartilage, skin, bone, muscle, neuromuscular junctions, liver, heart, lung, and kidney. It explains how scientists are attempting to provide these bioprinted tissues with a blood supply and the ability to carry nerve signals so that the tissues might be used for transplantation into persons with diseased or damaged organs. The book presents all the common terms in the bioprinting field and clarifies their meaning using plain language. Readers will learn about bioink—a bioprinting material containing living cells and supportive biomaterials. In addition, readers will become at ease with concepts such as fugitive inks (sacrificial inks used to make channels for blood flow), extracellular matrices (the biological environment surrounding cells), decellularization (the process of isolating cells from their native environment), hydrogels (water-based substances that can substitute for the extracellular matrix), rheology (the flow properties of a bioink), and bioreactors (containers to provide the environment cells need to thrive and multiply). Further vocabulary that will become familiar includes diffusion (passive movement of oxygen and nutrients from regions of high concentration to regions of low concentration), stem cells (cells with the potential to develop into different bodily cell types), progenitor cells (early descendants of stem cells), gene expression (the process by which proteins develop from instructions in our DNA), and growth factors (substances—often proteins—that stimulate cell growth, proliferation, and differentiation). The book contains an extensive glossary for quick reference.
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Asakura, Atsushi. Skeletal Muscle Stem Cells: Methods and Protocols. Springer, 2023.
Znajdź pełny tekst źródłaCzęści książek na temat "Muscle stem cell"
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Kuang, Shihuan, and Michael A. Rudnicki. "Muscle Stem Cells." In Cell Cycle Regulation and Differentiation in Cardiovascular and Neural Systems, 105–20. New York, NY: Springer New York, 2010. http://dx.doi.org/10.1007/978-1-60327-153-0_6.
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Abou-Khalil, Rana, Fabien Le Grand, and Bénédicte Chazaud. "Human and Murine Skeletal Muscle Reserve Cells." In Stem Cell Niche, 165–77. Totowa, NJ: Humana Press, 2013. http://dx.doi.org/10.1007/978-1-62703-508-8_14.
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Negroni, Elisa, Maximilien Bencze, Stéphanie Duguez, Gillian Butler-Browne, and Vincent Mouly. "Skeletal Muscle Stem Cells." In Stem Cell Biology and Regenerative Medicine, 415–28. New York: River Publishers, 2022. http://dx.doi.org/10.1201/9781003339601-19.
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Brand-Saberi, Beate, and Eric Bekoe Offei. "Skeletal Muscle Stem Cells." In Essential Current Concepts in Stem Cell Biology, 77–97. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-33923-4_5.
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Marra, Kacey G., Candace A. Brayfield, and J. Peter Rubin. "Adipose Stem Cell Differentiation into Smooth Muscle Cells." In Adipose-Derived Stem Cells, 261–68. Totowa, NJ: Humana Press, 2010. http://dx.doi.org/10.1007/978-1-61737-960-4_19.
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Goel, Aviva J., and Robert S. Krauss. "Ex Vivo Visualization and Analysis of the Muscle Stem Cell Niche." In Stem Cell Niche, 39–50. New York, NY: Springer New York, 2018. http://dx.doi.org/10.1007/7651_2018_177.
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Boldrin, Luisa, and Jennifer E. Morgan. "Modulation of the Host Skeletal Muscle Niche for Donor Satellite Cell Grafting." In Stem Cell Niche, 179–90. Totowa, NJ: Humana Press, 2013. http://dx.doi.org/10.1007/978-1-62703-508-8_15.
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McKay, Bryon R., and Gianni Parise. "Aging of Muscle Stem Cells." In Stem Cell Aging: Mechanisms, Consequences, Rejuvenation, 195–226. Vienna: Springer Vienna, 2015. http://dx.doi.org/10.1007/978-3-7091-1232-8_10.
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Sambasivan, Ramkumar, and Shahragim Tajbakhsh. "Adult Skeletal Muscle Stem Cells." In Results and Problems in Cell Differentiation, 191–213. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-662-44608-9_9.
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Duelen, Robin, Domiziana Costamagna, and Maurilio Sampaolesi. "Stem Cell Therapy in Muscle Degeneration." In The Plasticity of Skeletal Muscle, 55–91. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-3292-9_3.
Pełny tekst źródłaStreszczenia konferencji na temat "Muscle stem cell"
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Cassino, Theresa R., Masaho Okada, Lauren Drowley, Johnny Huard, and Philip R. LeDuc. "Mechanical Stimulation Improves Muscle-Derived Stem Cell Transplantation for Cardiac Repair." In ASME 2008 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2008. http://dx.doi.org/10.1115/sbc2008-192941.
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Muscle-derived stem cells (MDSCs) have been successfully transplanted into both skeletal (1) and cardiac muscle (2) of dystrophin-deficient (mdx) mice, and show potential for improving cardiac and skeletal dysfunction in diseases like Duchenne muscular dystrophy (DMD). Our previous study explored the regeneration of dystrophin-expressing myocytes following MDSC transplantation into environments with distinct blood flow and chemical/mechanical stimulation attributes. After MDSC transplantation within left ventricular myocardium and gastrocnemius (GN) muscles of the same mdx mice, significantly more dystrophin-positive fibers were found within the myocardium than in the GN. We hypothesized that the differences in mechanical loading of the two environments influenced the transplantation and explored whether using MDSCs exposed to mechanical stimulation prior to transplantation could improve transplantation. Our study shows increased engraftment into the heart and GN muscle for cells pretreated with mechanical stretch for 24 hours. This increase was significant for transplantation into the heart. These studies have implications in a variety of applications including mechanotransduction, stem cell biology, and Duchenne muscular dystrophy.
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Ahsan, Taby, Adele M. Doyle, Garry P. Duffy, Frank Barry, and Robert M. Nerem. "Stem Cells and Vascular Regenerative Medicine." In ASME 2008 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2008. http://dx.doi.org/10.1115/sbc2008-193591.
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Vascular applications in regenerative medicine include blood vessel substitutes and vasculogenesis in ischemic or engineered tissues. For these repair processes to be successful, there is a need for a stable supply of endothelial and smooth muscle cells. For blood vessel substitutes, the immediate goal is to enable blood flow, but vasoactivity is necessary for long term success. In engineered vessels, it is thought that endothelial cells will serve as an anti-thrombogenic lumenal layer, while smooth muscle cells contribute to vessel contractility. In other clinical applications, what is needed is not a vessel substitute but the promotion of new vessel formation (vasculogenesis). A simplified account of vasculogenesis is that endothelial cells assemble to form vessel-like structures that can then be stabilized by smooth muscle cells. Overall, the need for new vasculature to transfer oxygen and nutrients is important to reperfuse not only ischemic tissue in vivo, but also dense, structurally complex engineered tissue. The impact of these vascular therapies, however, is limited in part by the low yield and inadequate in vitro proliferation potential of primary endothelial and smooth muscle cells. Thus, there is a need to address the cell sourcing issue for vascular cell-based therapies, potentially using stem cells.
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Yuste, Yaiza, Juan A. Serrano, Alberto Olmo, Andres Maldonado-Jacobi, Pablo Pérez, Gloria Huertas, Sheila Pereira, Fernando de la Portilla, and Alberto Yúfera. "Monitoring Muscle Stem Cell Cultures with Impedance Spectroscopy." In 11th International Conference on Biomedical Electronics and Devices. SCITEPRESS - Science and Technology Publications, 2018. http://dx.doi.org/10.5220/0006712300960099.
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Soker, Shay, Dawn Delo, Samira Neshat, and Anthony Atala. "Amniotic Fluid Derived Stem Cells for Cardiac Muscle Therapies." In ASME 2008 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2008. http://dx.doi.org/10.1115/sbc2008-192492.
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Many forms of pediatric and adult heart disease are accompanied by high morbidity and mortality, as the heart muscle has limited regenerative potential. Cell therapy has been proposed as a means to promote the regeneration of injured heart muscle. We have established lines of broad spectrum multipotent stem cells derived from primitive fetal cells present in human amniotic fluid (hAFS) cells (1). AFS cells offer several advantages: They are easy to isolate and grow (no feeder layers needed), are highly expansive including clonal growth and they can differentiate into all germ layers. In the current study, we demonstrate that AFS cells can differentiate into cardiac muscle cells and be used for cardiac tissue regeneration.
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Tsvankin, Vadim, Dmitry Belchenko, Devon Scott, and Wei Tan. "Anisotropic Strain Effects on Vascular Smooth Muscle Cell Physiology." In ASME 2007 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2007. http://dx.doi.org/10.1115/sbc2007-176284.
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Biological development is a complex and highly-regulated process, a significant part of which is controlled by mechanostimulus, or the strain imparted on a cell by its environment. Mechanostimulus is important for stem cell differentiation, from cytoskeletal assembly to cell-cell and cell-matrix adhesion [1]. The mechanics of cells and tissues play a critical role in organisms, under both physiological and pathological conditions; abnormal mechanotransduction — the mechanism by which cells sense and respond to strain — has been implicated in a wide range of clinical pathologies [2,3].
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Cassino, Theresa R., Masaho Okada, Lauren M. Drowley, Joseph Feduska, Johnny Huard, and Philip R. LeDuc. "Using Mechanical Environment to Enhance Stem Cell Transplantation in Muscle Regeneration." In ASME 2007 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2007. http://dx.doi.org/10.1115/sbc2007-176545.
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Muscle-derived stem cell (MDSC) transplantation has shown potential as a therapy for cardiac and skeletal muscle dysfunction in diseases such as Duchenne muscular dystrophy (DMD). In this study we explore mechanical environment and its effects on MDSCs engraftment into cardiac and skeletal muscle in mdx mice and neoangiogenesis within the engraftment area. We first looked at transplantation of the same number of MDSCs into the heart and gastrocnemius (GN) muscle of dystrophic mice and the resulting dystrophin expression. We then explored neoangiogenesis within the engraftments through quantification of CD31 positive microvessels. This study is important to aid in determining the in vivo environmental factors leading to large graft size which may aid in determining optimum transplantation conditions for muscle repair.
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Li, Zhizhong. "Abstract A58: HMGA2 controls muscle stem cell activation and rhabdomyosarcoma progression." In Abstracts: AACR Special Conference: Pediatric Cancer at the Crossroads: Translating Discovery into Improved Outcomes; November 3-6, 2013; San Diego, CA. American Association for Cancer Research, 2014. http://dx.doi.org/10.1158/1538-7445.pedcan-a58.
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Monteiro, Gary A., and David I. Shreiber. "Guiding Stem Cell Differentiation Into Neural Lineages With Tunable Collagen Biomaterials." In ASME 2009 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2009. http://dx.doi.org/10.1115/sbc2009-206752.
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The long-term objective of this research is to develop tunable collagen-based biomaterial scaffolds for directed stem cell differentiation into neural lineages to aid in CNS diseases and trauma. Type I collagen is a ubiquitous protein that provides mechanostructural and ligand-induced biochemical cues to cells that attach to the protein via integrin receptors. Previous studies have demonstrated that the mechanical properties of a substrate or tissue can be an important regulator of stem cell differentiation. For example, the mechanical properties polyacrylamide gels can be tuned to induce neural differentiation from stem cells [1, 2]. Mesenchymal stem cells (MSCs) cultured on ployacrylamide gels with low elastic modulus (0.1–1 kPa) resulted in a neural like population. MSCs on 10-fold stiffer matrices that mimic striated muscle elasticity (Emuscle ∼8–17 kPa) lead to spindle-shaped cells similar in shape to myoblasts. Still stiffer gels (25–40 kPa) resulted in osetoblast differentiation. Based on these observations, collagen gels may provide an ideal material for differentiation into neural lineages because of their low compliance.
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Barğı, Gülşah, Meral Boşnak Güçlü, and Gülsan Türköz Sucak. "Stem cell recipients versus healthy subjects regarding exercise tolerance and muscle strength." In ERS International Congress 2018 abstracts. European Respiratory Society, 2018. http://dx.doi.org/10.1183/13993003.congress-2018.pa1485.
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Kallifatidis, Georgios, Diandra K. Smith, Jie Gao, Richard Pearce, Jiemin Li, Vinata Lokeshwar, and Balakrishna L. Lokeshwar. "Abstract 86: Beta-arrestins regulate basal cell and cancer stem cell phenotype in muscle-invasive bladder cancer." In Proceedings: AACR Annual Meeting 2018; April 14-18, 2018; Chicago, IL. American Association for Cancer Research, 2018. http://dx.doi.org/10.1158/1538-7445.am2018-86.
Pełny tekst źródłaRaporty organizacyjne na temat "Muscle stem cell"
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Huard, Johnny, Ira Fox, and David Perlmutter. Muscle Stem Cell Therapy for the Treatment of DMD Associated Cardiomyopathy. Fort Belvoir, VA: Defense Technical Information Center, October 2012. http://dx.doi.org/10.21236/ada576384.
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Gonzalez-Cadavid, Nestor F. Modulation of Stem Cell Differentiation and Myostatin as an Approach to Counteract Fibrosis in Muscle Dystrophy and Regeneration After Injury. Addendum. Fort Belvoir, VA: Defense Technical Information Center, March 2012. http://dx.doi.org/10.21236/ada586854.
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Halevy, Orna, Sandra Velleman, and Shlomo Yahav. Early post-hatch thermal stress effects on broiler muscle development and performance. United States Department of Agriculture, January 2013. http://dx.doi.org/10.32747/2013.7597933.bard.
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In broilers, the immediate post-hatch handling period exposes chicks to cold or hot thermal stress, with potentially harmful consequences to product quantity and quality that could threaten poultry meat marketability as a healthy, low-fat food. This lower performance includes adverse effects on muscle growth and damage to muscle structure (e.g., less protein and more fat deposition). A leading candidate for mediating the effects of thermal stress on muscle growth and development is a unique group of skeletal muscle cells known as adult myoblasts (satellite cells). Satellite cells are multipotential stem cells that can be stimulated to follow other developmental pathways, especially adipogenesis in lieu of muscle formation. They are most active during the first week of age in broilers and have been shown to be sensitive to environmental conditions and nutritional status. The hypothesis of the present study was that immediate post-hatch thermal stress would harm broiler growth and performance. In particular, growth characteristics and gene expression of muscle progenitor cells (i.e., satellite cells) will be affected, leading to increased fat deposition, resulting in long-term changes in muscle structure and a reduction in meat yield. The in vitro studies on cultured satellite cells derived from different muscle, have demonstrated that, anaerobic pectoralis major satellite cells are more predisposed to adipogenic conversion and more sensitive during myogenic proliferation and differentiation than aerobic biceps femoris cells when challenged to both hot and cold thermal stress. These results corroborated the in vivo studies, establishing that chronic heat exposure of broiler chicks at their first two week of life leads to impaired myogenicity of the satellite cells, and increased fat deposition in the muscle. Moreover, chronic exposure of chicks to inaccurate temperature, in particular to heat vs. cold, during their early posthatch periods has long-term effects of BW, absolute muscle growth and muscle morphology and meat quality. The latter is manifested by higher lipid and collagen deposition and may lead to the white striping occurrence. The results of this study emphasize the high sensitivity of muscle progenitor cells in the early posthatch period at a time when they are highly active and therefore the importance of rearing broiler chicks under accurate ambient temperatures. From an agricultural point of view, this research clearly demonstrates the immediate and long-term adverse effects on broiler muscling and fat formation due to chronic exposure to hot stress vs. cold temperatures at early age posthatch. These findings will aid in developing management strategies to improve broiler performance in Israel and the USA. BARD Report - Project4592 Page 2 of 29
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Yahav, Shlomo, John McMurtry, and Isaac Plavnik. Thermotolerance Acquisition in Broiler Chickens by Temperature Conditioning Early in Life. United States Department of Agriculture, 1998. http://dx.doi.org/10.32747/1998.7580676.bard.
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The research on thermotolerance acquisition in broiler chickens by temperature conditioning early in life was focused on the following objectives: a. To determine the optimal timing and temperature for inducing the thermotolerance, conditioning processes and to define its duration during the first week of life in the broiler chick. b. To investigate the response of skeletal muscle tissue and the gastrointestinal tract to thermal conditioning. This objective was added during the research, to understand the mechanisms related to compensatory growth. c. To evaluate the effect of early thermo conditioning on thermoregulation (heat production and heat dissipation) during 3 phases: (1) conditioning, (2) compensatory growth, (3) heat challenge. d. To investigate how induction of improved thermotolerance impacts on metabolic fuel and the hormones regulating growth and metabolism. Recent decades have seen significant development in the genetic selection of the meat-type fowl (i.e., broiler chickens); leading to rapid growth and increased feed efficiency, providing the poultry industry with heavy chickens in relatively short growth periods. Such development necessitates parallel increases in the size of visceral systems such as the cardiovascular and the respiratory ones. However, inferior development of such major systems has led to a relatively low capability to balance energy expenditure under extreme conditions. Thus, acute exposure of chickens to extreme conditions (i.e., heat spells) has resulted in major economic losses. Birds are homeotherms, and as such, they are able to maintain their body temperature within a narrow range. To sustain thermal tolerance and avoid the deleterious consequences of thermal stresses, a direct response is elicited: the rapid thermal shock response - thermal conditioning. This technique of temperature conditioning takes advantage of the immaturity of the temperature regulation mechanism in young chicks during their first week of life. Development of this mechanism involves sympathetic neural activity, integration of thermal infom1ation in the hypothalamus, and buildup of the body-to-brain temperature difference, so that the potential for thermotolerance can be incorporated into the developing thermoregulation mechanisms. Thermal conditioning is a unique management tool, which most likely involves hypothalamic them1oregulatory threshold changes that enable chickens, within certain limits, to cope with acute exposure to unexpected hot spells. Short-tem1 exposure to heat stress during the first week of life (37.5+1°C; 70-80% rh; for 24 h at 3 days of age) resulted in growth retardation followed immediately by compensatory growth" which resulted in complete compensation for the loss of weight gain, so that the conditioned chickens achieved higher body weight than that of the controls at 42 days of age. The compensatory growth was partially explained by its dramatic positive effect on the proliferation of muscle satellite cells which are necessary for further muscle hypertrophy. By its significant effect of the morphology and functioning of the gastrointestinal tract during and after using thermal conditioning. The significant effect of thermal conditioning on the chicken thermoregulation was found to be associated with a reduction in heat production and evaporative heat loss, and with an increase in sensible heat loss. It was further accompanied by changes in hormones regulating growth and metabolism These physiological responses may result from possible alterations in PO/AH gene expression patterns (14-3-3e), suggesting a more efficient mechanism to cope with heat stress. Understanding the physiological mechanisms behind thermal conditioning step us forward to elucidate the molecular mechanism behind the PO/AH response, and response of other major organs. The thermal conditioning technique is used now in many countries including Israel, South Korea, Australia, France" Ecuador, China and some places in the USA. The improvement in growth perfom1ance (50-190 g/chicken) and thermotolerance as a result of postnatal thermal conditioning, may initiate a dramatic improvement in the economy of broiler's production.
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Funkenstein, Bruria, and Cunming Duan. GH-IGF Axis in Sparus aurata: Possible Applications to Genetic Selection. United States Department of Agriculture, November 2000. http://dx.doi.org/10.32747/2000.7580665.bard.
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Many factors affect growth rate in fish: environmental, nutritional, genetics and endogenous (physiological) factors. Endogenous control of growth is very complex and many hormone systems are involved. Nevertheless, it is well accepted that growth hormone (GH) plays a major role in stimulating somatic growth. Although it is now clear that most, if not all, components of the GH-IGF axis exist in fish, we are still far from understanding how fish grow. In our project we used as the experimental system a marine fish, the gilthead sea bream (Sparus aurata), which inhabits lagoons along the Mediterranean and Atlantic coasts of Europe, and represents one of the most important fish species used in the mariculture industry in the Mediterranean region, including Israel. Production of Sparus is rapidly growing, however, in order for this production to stay competitive, the farming of this fish species has to intensify and become more efficient. One drawback, still, in Sparus extensive culture is that it grows relatively slow. In addition, it is now clear that growth and reproduction are physiological interrelated processes that affect each other. In particular sexual maturation (puberty) is known to be closely related to growth rate in fish as it is in mammals, indicating interactions between the somatotropic and gonadotropic axes. The goal of our project was to try to identify the rate-limiting components(s) in Sparus aurata GH-IGF system which might explain its slow growth by studying the ontogeny of growth-related genes: GH, GH receptor, IGF-I, IGF-II, IGF receptor, IGF-binding proteins (IGFBPs) and Pit-1 during early stages of development of Sparus aurata larvae from slow and fast growing lines. Our project was a continuation of a previous BARD project and could be divided into five major parts: i) obtaining additional tools to those obtained in the previous project that are necessary to carry out the developmental study; ii) the developmental expression of growth-related genes and their cellular localization; iii) tissue-specific expression and effect of GH on expression of growth-related genes; iv) possible relationship between GH gene structure, growth rate and genetic selection; v) the possible role of the IGF system in gonadal development. The major findings of our research can be summarized as follows: 1) The cDNAs (complete or partial) coding for Sparus IGFBP-2, GH receptor and Pit-1 were cloned. Sequence comparison reveals that the primary structure of IGFBP-2 protein is 43-49% identical to that of zebrafish and other vertebrates. Intensive efforts resulted in cloning a fragment of 138 nucleotides, coding for 46 amino acids in the proximal end of the intracellular domain of GH receptor. This is the first fish GH receptor cDNA that had been cloned to date. The cloned fragment will enable us to complete the GH - receptor cloning. 2) IGF-I, IGF-II, IGFBP-2, and IGF receptor transcripts were detected by RT-PCR method throughout development in unfertilized eggs, embryos, and larvae suggesting that these mRNAs are products of both the maternal and the embryonic genomes. Preliminary RT-PCR analysis suggest that GH receptor transcript is present in post-hatching larvae already on day 1. 3) IGF-1R transcripts were detected in all tissues tested by RT-PCR with highest levels in gill cartilage, skin, kidney, heart, pyloric caeca, and brain. Northern blot analysis detected IGF receptor only in gonads, brain and gill cartilage but not in muscle; GH increased slightly brain and gill cartilage IGF-1R mRNA levels. 4) IGFBP-2 transcript were detected only in liver and gonads, when analyzed by Northern blots; RT-PCR analysis revealed expression in all tissues studied, with the highest levels found in liver, skin, gonad and pyloric caeca. 5) Expression of IGF-I, IGF-II, IGF-1R and IGFBP-2 was analyzed during gonadal development. High levels of IGF-I and IGFBP-2 expression were found in bisexual young gonads, which decreased during gonadal development. Regardless of maturational stage, IGF-II levels were higher than those of IGF-L 6) The GH gene was cloned and its structure was characterized. It contains minisatellites of tandem repeats in the first and third introns that result in high level of genetic polymorphism. 7) Analysis of the presence of IGF-I and two types of IGF receptor by immunohistochemistry revealed tissue- and stage-specific expression during larval development. Immunohistochemistry also showed that IGF-I and its receptors are present in both testicular and ovarian cells. Although at this stage we are not able to pinpoint which is the rate-limiting step causing the slow growth of Sparus aurata, our project (together with the previous BARD) yielded a great number of experimental tools both DNA probes and antibodies that will enable further studies on the factors regulating growth in Sparus aurata. Our expression studies and cellular localization shed new light on the tissue and developmental expression of growth-related genes in fish.