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1

Hirsch, Mathias. "Deux modes de l'identification à l'agresseur d'après Ferenczi et Anna Freud." Le Coq-Héron 149, no. 1 (1998): 13–21. https://doi.org/10.3406/coqhe.1998.1749.

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Une des tentatives possibles de maîtriser psychiquement la violence dans le cadre du développement infantile dans la famille, mais aussi de la terreur politique, la torture et la détention en camp de concentration, est la reconnaissance identificatoire de la force démesurée, c'est-à-dire la soumission à celle-ci. Ferenczi a décrit ce mécanisme par rapport à l'abus sexuel, la maltraitance corporelle et l'effet des reproches par des malades chroniques adultes sur leurs enfants comme un événement d'intériorisation de la violence. Les victimes intériorisent la violence, s'identifient au système du
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2

Blanchet, Pascal. "Chants de femmes triomphantes." Revue musicale OICRM 3, no. 2 (2019): 38–54. http://dx.doi.org/10.7202/1060106ar.

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Quand Germaine Tillion et ses compagnes mettent au point leur « opérette-revue » à Ravensbrück, elles choisissent comme support à leurs paroles plusieurs mélodies provenant d’opérettes. Leur choix se porte tout naturellement sur des œuvres importantes dans l’histoire du genre. L’opérette, genre marqué par une certaine oppression dès sa naissance et tout au long de son histoire, se retrouve ainsi étrangement à sa place dans un camp de concentration. Déjà, le titre du Verfügbar aux Enfers fait référence au chef-d’œuvre de Jacques Offenbach, Orphée aux Enfers (1858) et, chacune à sa manière, les
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3

Loff, Manuel, Cristina Clímaco, Marie-Christine Volovitch-Tavares, and Clara Domingues. "La guerre d’Espagne dans la mémoire antifasciste portugaise : persistance et recomposition." Exils et migrations ibériques aux XX e et XXI e siècles N° 11-12, no. 1 (2021): 364–410. https://doi.org/10.3917/emi.011.0364.

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La mémoire de la participation portugaise à la lutte internationale contre le fascisme en Espagne est encore soumise à des contraintes (avant tout parce qu’aucune brigade portugaise ne s’est constituée au sein des Brigades internationales). Ces contraintes ont empêché que cette mémoire de lutte antifasciste en Espagne ait eu au Portugal un poids identique à celui joué dans les processus de légitimation politique, symbolique et historique de la gauche européenne et américaine. La présence de lieux et d’objets de mémoire de la solidarité internationale avec la République espagnole est un phénomè
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4

Schlatterer, C., F. Gollnick, E. Schmidt, R. Meyer, and G. Knoll. "Challenge with high concentrations of cyclic AMP induces transient changes in the cytosolic free calcium concentration in Dictyostelium discoideum." Journal of Cell Science 107, no. 8 (1994): 2107–15. http://dx.doi.org/10.1242/jcs.107.8.2107.

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Dictyostelium discoideum cells use cyclic AMP (cAMP) for chemotactic signaling as well as for differentiation. The precise regulation of the cytosolic Ca2+ concentration ([Ca2+]i) seems to play a key role for both processes. We performed single cell measurements of [Ca2+]i in amoebae that were starved in suspension for various times and scrape-loaded with the Ca2+ indicator fura-2. Stimulation of cells with cAMP at the concentration required to induce gene expression (> or = 100 microM) elicited a global transient increase in [Ca2+]i that depended on the presence of external Ca2+. Both
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5

Assender, J. W., K. M. Southgate, M. B. Hallett, and A. C. Newby. "Inhibition of proliferation, but not of Ca2+ mobilization, by cyclic AMP and GMP in rabbit aortic smooth-muscle cells." Biochemical Journal 288, no. 2 (1992): 527–32. http://dx.doi.org/10.1042/bj2880527.

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The effects on cellular proliferation and Ca2+ mobilization of analogues of cyclic AMP (cAMP) and cyclic GMP (cGMP) and of agents that elevate the intracellular concentrations of cyclic nucleotides were compared in closely similar preparations of first-passage rabbit aortic vascular smooth-muscle cells. Proliferation induced by foetal-bovine serum was inhibited by 78% by 1 mM-8-bromo cAMP and by 42% by 1 mM-8-bromo cGMP. In the presence of 100 microM-isobutylmethylxanthine, 100 microM-forskolin increased intracellular cAMP concentration 5-fold and inhibited proliferation by 87%, but did not af
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6

Ponnampalam, Eric N., Kym L. Butler, Stephanie K. Muir, et al. "Lipid Oxidation and Colour Stability of Lamb and Yearling Meat (Muscle longissimus lumborum) from Sheep Supplemented with Camelina-Based Diets after Short-, Medium-, and Long-Term Storage." Antioxidants 10, no. 2 (2021): 166. http://dx.doi.org/10.3390/antiox10020166.

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This study investigated the impact of feeding pelleted diets containing camelina (Camelina sativa L. Crantz) hay (CAHP) or camelina meal (CAMP) as a supplement compared with a control pellet (CONP) diet, without vitamin E fortification. The fatty acid profile, retail colour, and lipid oxidative stability of lamb and yearling meat (m. longissimus lumborum) stored for short-, medium-, or long-periods (2 days (fresh), 45 days and 90 days) under chilled to semi-frozen conditions were determined. The CAMP diet altered key fatty acids (p < 0.05) in a nutritionally beneficial manner for human heal
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7

London, R. D., M. S. Lipkowitz, R. H. Sinert, and R. G. Abramson. "Modulation of ionic permeability in a nonpolarized cell: effect of cAMP." American Journal of Physiology-Renal Physiology 257, no. 6 (1989): F985—F993. http://dx.doi.org/10.1152/ajprenal.1989.257.6.f985.

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To evaluate whether adenosine 3',5'-cyclic monophosphate (cAMP) modulates ionic permeabilities of nonpolarized cells, as reported in diverse polarized epithelia, relative ionic permeabilities were determined in human red cell ghosts by means of the potential-sensitive fluorescent probe 3,3'-dipropylthiadicarbocyanine iodide. Relative ionic chloride permeability (PCl/PK), but not PNa/PK, was significantly increased in ghosts prepared from normal red blood cells (RBCs) exposed to cAMP analogues or forskolin, with the latter at a concentration that significantly increased intracellular cAMP conce
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8

NÜSING, Rolf M., Thomas KLEIN, Josef PFEILSCHIFTER, and Volker ULLRICH. "Effect of cyclic AMP and prostaglandin E2 on the induction of nitric oxide- and prostanoid-forming pathways in cultured rat mesangial cells." Biochemical Journal 313, no. 2 (1996): 617–23. http://dx.doi.org/10.1042/bj3130617.

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Cyclic AMP (cAMP) represents an important cellular signalling molecule. We analysed the effect of dibutyryl cAMP (db-cAMP), a cell-permeable and stable derivative of cAMP, on the regulation and expression of cyclo-oxygenase 2, inducible NO synthase and argininosuccinate synthetase. We observed different transcriptional regulation of these enzymes depending on the db-cAMP concentration used. Low concentrations of db-cAMP in the range 10-50 μM elevated levels of cyclo-oxygenase 2 mRNA, protein and activity, but not the respective mRNA and protein concentrations of the inducible NO synthase or ar
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9

Gettys, T. W., P. F. Blackmore, and J. D. Corbin. "An assessment of phosphodiesterase activity in situ after treatment of hepatocytes with hormones." American Journal of Physiology-Endocrinology and Metabolism 254, no. 4 (1988): E449—E453. http://dx.doi.org/10.1152/ajpendo.1988.254.4.e449.

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The role of phosphodiesterase activation in controlling adenosine 3',5'-cyclic monophosphate (cAMP) levels within hepatocytes was investigated by preloading hepatocytes with the hydrolyzable cAMP analogue 8-para-chlorophenylthio-cAMP (8-pCl phi S-cAMP) and measuring disappearance of the analogue after treating the cells with various hormones. Incubation of hepatocytes with 15 nM 8-pCl phi S-cAMP increased the intracellular concentration of the analogue at 0.5 and 2 min, but by 5 min the concentration plateaued and remained constant or declined slightly at 7 and 10 min. Treatment of hepatocytes
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10

Koh, S. D., and K. M. Sanders. "Modulation of Ca2+ current in canine colonic myocytes by cyclic nucleotide-dependent mechanisms." American Journal of Physiology-Cell Physiology 271, no. 3 (1996): C794—C803. http://dx.doi.org/10.1152/ajpcell.1996.271.3.c794.

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Regulation of Ca2+ currents by cyclic nucleotide-dependent mechanisms was studied in circular muscle cells isolated from canine proximal colon. Whole cell Ca2+ currents were recorded at 32 degrees C with the use of amphotericin B-perforated patches. The effects of several agents known to increase levels of adenosine 3',5'-cyclic monophosphate (cAMP) were tested. Vasoactive intestinal peptide (VIP) and isoproterenol (10(-7) to 10(-5) M) increased Ca2+ current in a concentration-dependent manner. Forskolin (10(-7) M) and dibutyryl cAMP (10(-6) to 10(-5) M) also increased Ca2+ current. Higher con
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11

Tovey, Stephen C., Skarlatos G. Dedos, Emily J. A. Taylor, Jarrod E. Church, and Colin W. Taylor. "Selective coupling of type 6 adenylyl cyclase with type 2 IP3 receptors mediates direct sensitization of IP3 receptors by cAMP." Journal of Cell Biology 183, no. 2 (2008): 297–311. http://dx.doi.org/10.1083/jcb.200803172.

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Interactions between cyclic adenosine monophosphate (cAMP) and Ca2+ are widespread, and for both intracellular messengers, their spatial organization is important. Parathyroid hormone (PTH) stimulates formation of cAMP and sensitizes inositol 1,4,5-trisphosphate receptors (IP3R) to IP3. We show that PTH communicates with IP3R via “cAMP junctions” that allow local delivery of a supramaximal concentration of cAMP to IP3R, directly increasing their sensitivity to IP3. These junctions are robust binary switches that are digitally recruited by increasing concentrations of PTH. Human embryonic kidne
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12

Nielson, C. P., C. Bayer, S. Hodson, and N. Hadjokas. "Regulation of the respiratory burst by cyclic 3',5'-AMP, an association with inhibition of arachidonic acid release." Journal of Immunology 149, no. 12 (1992): 4036–40. http://dx.doi.org/10.4049/jimmunol.149.12.4036.

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Abstract The mechanism of cAMP regulation of the respiratory burst was studied with HL-60 cells that had been DMSO-differentiated to a neutrophil-like cell. To evaluate the effects of known cAMP concentrations, cells were permeabilized with streptolysin-O. Chemotactic peptide (FMLP)-stimulated NADPH oxidase activity was inhibited by cAMP at concentrations higher than 3 microM. Because intracellular calcium was buffered, inhibitory actions of cAMP were not mediated by modulation of calcium concentration. Effects of cAMP on chemotactic peptide signal transduction mediated by phospholipase C, pho
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13

Eby, Joshua C., Mary C. Gray, Annabelle R. Mangan, Gina M. Donato, and Erik L. Hewlett. "Role of CD11b/CD18 in the Process of Intoxication by the Adenylate Cyclase Toxin of Bordetella pertussis." Infection and Immunity 80, no. 2 (2011): 850–59. http://dx.doi.org/10.1128/iai.05979-11.

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ABSTRACTThe adenylate cyclase toxin (ACT) ofBordetella pertussisdoes not require a receptor to generate intracellular cyclic AMP (cAMP) in a broad range of cell types. To intoxicate cells, ACT binds to the cell surface, translocates its catalytic domain across the cell membrane, and converts intracellular ATP to cAMP. In cells that express the integrin CD11b/CD18 (CR3), ACT is more potent than in CR3-negative cells. We find, however, that the maximum levels of cAMP accumulation inside CR3-positive and -negative cells are comparable. To better understand how CR3 affects the generation of cAMP,
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14

Bost, K. L., B. L. Clarke, J. C. Xu, H. Kiyono, J. R. McGhee, and D. Pascual. "Modulation of IgM secretion and H chain mRNA expression in CH12.LX.C4.5F5 B cells by adrenocorticotropic hormone." Journal of Immunology 145, no. 12 (1990): 4326–31. http://dx.doi.org/10.4049/jimmunol.145.12.4326.

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Abstract The murine B cell line CH12.LX.C4.5F5 (CH12 (5F5) expresses adrenocorticotropin (ACTH) receptors, which can modulate IgM secretion by these cells. Interestingly, the response to ACTH was concentration dependent, inducing IgM secretion at subnanomolar amounts and suppressing secretion at micromolar amounts. With the use of an enzyme-linking immunospot assay it was possible to demonstrate that the ACTH-induced increase in IgM secretion by CH12 (5F5) cells was caused at least in part by an increase in the number of cells secreting IgM. CH12 (5F5) cells activated with suboptimal concentra
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15

Terrin, Anna, Giulietta Di Benedetto, Vanessa Pertegato, et al. "PGE1 stimulation of HEK293 cells generates multiple contiguous domains with different [cAMP]: role of compartmentalized phosphodiesterases." Journal of Cell Biology 175, no. 3 (2006): 441–51. http://dx.doi.org/10.1083/jcb.200605050.

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There is a growing appreciation that the cyclic adenosine monophosphate (cAMP)–protein kinase A (PKA) signaling pathway is organized to form transduction units that function to deliver specific messages. Such organization results in the local activation of PKA subsets through the generation of confined intracellular gradients of cAMP, but the mechanisms responsible for limiting the diffusion of cAMP largely remain to be clarified. In this study, by performing real-time imaging of cAMP, we show that prostaglandin 1 stimulation generates multiple contiguous, intracellular domains with different
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16

Faquetti, M. L., F. Grisoni, P. Schneider, G. Schneider, and A. M. Burden. "POS0091 OFF-TARGET PROFILING OF JANUS KINASE (JAK) INHIBITORS IN RHEUMATOID ARTHRITIS: A COMPUTER-BASED APPROACH FOR DRUG SAFETY STUDIES AND REPURPOSING." Annals of the Rheumatic Diseases 80, Suppl 1 (2021): 255.2–255. http://dx.doi.org/10.1136/annrheumdis-2021-eular.982.

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Background:The JAK inhibitors (JAKi’s) tofacitinib and baricitinib are new alternatives for treating rheumatoid arthritis. Safety concerns associated with JAKi’s, such as the increased risk for thrombosis and viral infections, have emerged worldwide. The underlying explanatory mechanisms remain unknown, suggesting the elevated risk is likely due to underlying confounding or an off-target binding effect. Computational approaches can explore the potential for a small molecule drug to interact with previously unknown biological targets and identify potential safety-related concerns, and open door
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17

Lobaugh, L. A., and P. J. Blackshear. "Neuropeptide Y binding and inhibition of cAMP accumulation in human neuroepithelioma cells." American Journal of Physiology-Cell Physiology 258, no. 5 (1990): C913—C922. http://dx.doi.org/10.1152/ajpcell.1990.258.5.c913.

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The specific binding of 125I-labeled neuropeptide Y (NPY) and the biological response to NPY receptor activation were measured in cultured human neuroepithelioma (SK-N-MC) cells. A single class of high-affinity binding sites [dissociation constant (KD) = 0.2 nM] was characterized both by equilibrium binding of 125I-NPY concentrations less than 1 nM and kinetically by the initial rates of 125I-NPY association and dissociation. Specific 125I-NPY binding was decreased in a concentration-dependent manner by inclusion of guanine nucleotides in the incubation medium. The existence of multiple affini
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18

Redmon, J. B., T. W. Gettys, V. S. Sheorain, J. D. Corbin, and I. L. Taylor. "Failure of insulin to antagonize cAMP-mediated glycogenolysis in rat ventricular cardiomyocytes." American Journal of Physiology-Endocrinology and Metabolism 258, no. 5 (1990): E871—E877. http://dx.doi.org/10.1152/ajpendo.1990.258.5.e871.

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Isolated rat ventricular cardiomyocytes were used to study the effects of insulin on glycogen metabolism in cells treated with various agents that activate adenosine 3',5'-cyclic monophosphate (cAMP)-dependent protein kinase. Incubation of myocytes with isoproterenol produced a rapid concentration-dependent increase in cAMP concentration, cAMP-dependent protein kinase activity, and phosphorylase activity and a simultaneous decrease in the glycogen synthase activity ratio. Various cAMP analogues also produced a concentration-dependent increase in phosphorylase activity and a decline in the glyc
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19

Laub, Michael T., and William F. Loomis. "A Molecular Network That Produces Spontaneous Oscillations in Excitable Cells ofDictyostelium." Molecular Biology of the Cell 9, no. 12 (1998): 3521–32. http://dx.doi.org/10.1091/mbc.9.12.3521.

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A network of interacting proteins has been found that can account for the spontaneous oscillations in adenylyl cyclase activity that are observed in homogenous populations of Dictyosteliumcells 4 h after the initiation of development. Previous biochemical assays have shown that when extracellular adenosine 3′,5′-cyclic monophosphate (cAMP) binds to the surface receptor CAR1, adenylyl cyclase and the MAP kinase ERK2 are transiently activated. A rise in the internal concentration of cAMP activates protein kinase A such that it inhibits ERK2 and leads to a loss-of-ligand binding by CAR1. ERK2 pho
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20

Ethier, M. F., O. P. Schaefer, N. Samant, H. Yamaguchi, and J. M. Madison. "Muscarinic receptor reserve for inhibition of cAMP accumulation in bovine trachealis cells." American Journal of Physiology-Lung Cellular and Molecular Physiology 270, no. 2 (1996): L199—L207. http://dx.doi.org/10.1152/ajplung.1996.270.2.l199.

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In airway smooth muscle, muscarinic agonists inhibit synthesis of adenosine 3',5'-cyclic monophosphate (cAMP). The goal was to characterize the relationship between agonist occupancy of muscarinic receptors and regulation of cAMP for bovine trachealis cells. For intact cells dispersed by enzyme, carbachol maximally inhibited 58 +/- 4% (mean +/- SE, n = 5) of isoproterenol-stimulated cAMP accumulation at low concentrations [log half-maximal effective concentration (EC50) = -8.34 +/- 0.16]. In radioligand binding experiments, carbachol competed for [3H]quinuclidinyl benzilate (n = 7) and [N-meth
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21

Herness, M. S., X. D. Sun, and Y. Chen. "cAMP and forskolin inhibit potassium currents in rat taste receptor cells by different mechanisms." American Journal of Physiology-Cell Physiology 272, no. 6 (1997): C2005—C2018. http://dx.doi.org/10.1152/ajpcell.1997.272.6.c2005.

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In gustatory transduction, adenosine 3',5'-cyclic monophosphate (cAMP) has been suggested to close potassium channels when elevated by sweet stimuli or to open cAMP-gated cation channels when depressed by bitter stimuli. These experiments examine the effect of cAMP on whole cell currents from posterior taste receptor cells with standard patch-clamp techniques. Elevating cytosolic cAMP by pipette administration, membrane-permeant analogs [8-(4-chlorophenylthio)-cAMP (CPT-cAMP) and dibutyryl-cAMP], or by phosphodiesterase inhibition [3-isobutyl-1-methylxanthine (IBMX)] produced poorly reversible
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22

Hasegawa, K., H. Kikuchi, S. Ishizaki, et al. "Simple fluctuation of Ca2+ elicits the complex circadian dynamics of cyclic AMP and cyclic GMP in Paramecium." Journal of Cell Science 112, no. 2 (1999): 201–7. http://dx.doi.org/10.1242/jcs.112.2.201.

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The circadian dynamics of cyclic adenosine 3′,5′-monophosphate (cAMP) and cyclic guanosine 3′,5′-monophosphate (cGMP) were simulated in Paramecium multimicronucleatum. The mathematical functions determined closely mimic the Ca2+ dependence of adenylate cyclase (AC) and guanylate cyclase (GC) activities as documented in P. tetraurelia. Patterns of cAMP concentration ([cAMP]), cGMP concentration ([cGMP]), and the ratio [cGMP]/[cAMP] were calculated with respect to Ca2+ concentrations ([Ca2+]) fluctuating sinusoidally with a period of 24 hours at three different levels: low, medium, and high. The
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23

Fontana, D. R., C. S. Luo, and J. C. Phillips. "Dictyostelium discoideum lipids modulate cell-cell cohesion and cyclic AMP signaling." Molecular and Cellular Biology 11, no. 1 (1991): 468–75. http://dx.doi.org/10.1128/mcb.11.1.468-475.1991.

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During Dictyostelium discoideum development, cell-cell communication is mediated through cyclic AMP (cAMP)-induced cAMP synthesis and secretion (cAMP signaling) and cell-cell contact. Cell-cell contact elicits cAMP secretion and modulates the magnitude of a subsequent cAMP signaling response (D. R. Fontana and P. L. Price, Differentiation 41:184-192, 1989), demonstrating that cell-cell contact and cAMP signaling are not independent events. To identify components involved in the contact-mediated modulation of cAMP signaling, amoebal membranes were added to aggregation-competent amoebae in suspe
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Börner, Sebastian, Frank Schwede, Angela Schlipp, et al. "FRET measurements of intracellular cAMP concentrations and cAMP analog permeability in intact cells." Nature Protocols 6, no. 4 (2011): 427–38. http://dx.doi.org/10.1038/nprot.2010.198.

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Eikvar, Lars, Kristin Austlid Taskén, Winnie Eskild, and Vidar Hansson. "Protein kinase C activation and positive and negative agonist regulation of 3′, 5′-cyclic adenosine monophosphate levels in cultured rat Sertoli cells." Acta Endocrinologica 128, no. 6 (1993): 568–72. http://dx.doi.org/10.1530/acta.0.1280568.

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The present study examines the effects of 12-0-tetradecanoylphorbol-13-acetate (TPA) on agonist-regulated 3′, 5′-cyclic adenosine monophosphate (cAMP) formation and cAMP-mediated effects in cultured Sertoli cells from immature rats. Concentration-dependent stimulation of cAMP levels by follicle-stimulating hormone (FSH) was inhibited dramatically by the coaddition of 100 nmol/l TPA, which exerted a similar inhibition of glucagon- and isoproterenol-stimulated cAMP production. These results show that protein kinase C (PKC) activation by TPA attenuates Gs-protein-mediated agonist activation of cA
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Tamaoki, J., M. Kondo, and T. Takizawa. "Effect of cAMP on ciliary function in rabbit tracheal epithelial cells." Journal of Applied Physiology 66, no. 3 (1989): 1035–39. http://dx.doi.org/10.1152/jappl.1989.66.3.1035.

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To study the effect of adenosine 3′,5′-cyclic monophosphate (cAMP) on respiratory ciliary activity, we measured ciliary beat frequency (CBF) of rabbit tracheal epithelium by a photoelectric method in response to cAMP analogues and agents that can increase endogenous cAMP production. Addition of 8-bromo-cAMP dose dependently enhanced CBF, with the maximal increase and the concentration necessary to produce a half-maximal response (KD) being 31.0 +/- 3.4% (SE) (P less than 0.001) and 3.2 +/- 1.5 x 10(-7) M, respectively. Other structurally dissimilar cAMP analogues dibutyryl cAMP and chloropheny
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27

Zeng, Hong, Ying Liu, and Douglas M. Templeton. "Ca2+/calmodulin-dependent and cAMP-dependent kinases in induction of c-fos in human mesangial cells." American Journal of Physiology-Renal Physiology 283, no. 5 (2002): F888—F894. http://dx.doi.org/10.1152/ajprenal.00074.2002.

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Mesangial cell proliferation is an early event in several progressive renal diseases. When mesangial cells in culture are rendered quiescent by serum starvation and subsequently stimulated to proliferate, induction of c- fos is an early indicator of entry into the cell cycle. Several heparin-sensitive signals transduce these events. We have examined the potential roles of CaMK and PKA. Selective stimulation of CaMK with Ca2+ ionophores and of PKA with forskolin or dibutyryl cAMP both result in induction of c- fos mRNA. CaMK but not PKA signaling is suppressed by low concentrations of heparin.
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Dardik, Alan, and Richard M. Schultz. "Changes in camp phosphodiesterase activity and cAMP concentration during mouse preimplantation development." Molecular Reproduction and Development 32, no. 4 (1992): 349–53. http://dx.doi.org/10.1002/mrd.1080320407.

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Yumura, S., K. Furuya, and I. Takeuchi. "Intracellular free calcium responses during chemotaxis of Dictyostelium cells." Journal of Cell Science 109, no. 11 (1996): 2673–78. http://dx.doi.org/10.1242/jcs.109.11.2673.

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A calcium ion indicator, fura-2 bovine serum albumin, was introduced into Dictyostelium discoideum cells by electroporation. The concentration of intracellular calcium ions ([Ca2+]i) increased transiently in vegetative cells upon stimulation with submicromolar concentrations of folic acid, a chemoattractant for this organism at the vegetative stage. Similar [Ca2+]i responses were also observed in aggregation-competent cells upon stimulation with subnanomolar concentrations of cAMP, a chemoattractant at the aggregation stage. The [Ca2+]i response caused by cAMP was 2.1 times higher than that ca
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Nguyen, Thi Tho, and Thi Mong Diep Nguyen. "Effect of fluoxetine on cyclic adenosine monophosphate response to follicle-stimulating hormone in HEK cells." Veterinary Integrative Sciences 20, no. 3 (2022): 731–38. http://dx.doi.org/10.12982/vis.2022.056.

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Fluoxetine is an antidepressant that acts as a selective serotonin reuptake inhibitor. Fluoxetine has exhibited different mechanisms of action on many different cell lines. In this study, the effect of fluoxetine on cAMP production in human embryonic kidney (HEK) cells under the stimulation of bovine follicle-stimulating hormone were examined. HEK cells were incubated for 60 minutes with fluoxetine at different concentrations (0, 6.25, 12.5, 25 and 50 μM), and then cAMP accumulation, ATP level, and AMPK phosphorylation and cell viability were tested. Our results showed that fluoxetine at 25 an
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Wolf, G., P. D. Killen, and E. G. Neilson. "Intracellular signaling of transcription and secretion of type IV collagen after angiotensin II-induced cellular hypertrophy in cultured proximal tubular cells." Cell Regulation 2, no. 3 (1991): 219–27. http://dx.doi.org/10.1091/mbc.2.3.219.

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Physiologic concentrations of angiotensin II (AII) can induce cellular hypertrophy in murine proximal tubular epithelium (MCT cells). This response is characterized by an increase in cell size, new protein synthesis, and by the secretion of new basement membrane type IV collagen in the absence of cellular proliferation. The present study was undertaken to evaluate the second messengers of these AII-induced cellular events with special reference to the increase in type IV collagen secretion. In initial experiments we observed that pretreatment of MCT cells with agents that increase concentratio
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Nakashima, Noriyuki, Kie Nakashima, Akiko Nakashima, and Makoto Takano. "Olfactory marker protein elevates basal cAMP concentration." Biochemical and Biophysical Research Communications 531, no. 2 (2020): 203–8. http://dx.doi.org/10.1016/j.bbrc.2020.07.087.

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Eddlestone, G. T., S. B. Oldham, L. G. Lipson, F. H. Premdas, and P. M. Beigelman. "Electrical activity, cAMP concentration, and insulin release in mouse islets of Langerhans." American Journal of Physiology-Cell Physiology 248, no. 1 (1985): C145—C153. http://dx.doi.org/10.1152/ajpcell.1985.248.1.c145.

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The influence of forskolin and 3-iso-butyl-1-methylxanthine (IBMX) on mouse pancreatic beta-cell electrical activity, whole islet cAMP content, and insulin release were investigated. The two drugs potentiated to a similar extent both glucose-stimulated electrical activity and insulin release. In terms of the electrical response, both drugs potentiated the silent depolarization of the membrane in response to low (substimulatory) glucose concentrations, whereas at higher (stimulatory) glucose concentrations they caused an increase in the plateau fraction, with a response similar to the effect of
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Francis, Heather, Shannon Glaser, Sharon DeMorrow, et al. "Small mouse cholangiocytes proliferate in response to H1 histamine receptor stimulation by activation of the IP3/CaMK I/CREB pathway." American Journal of Physiology-Cell Physiology 295, no. 2 (2008): C499—C513. http://dx.doi.org/10.1152/ajpcell.00369.2007.

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Cholangiopathies are characterized by the heterogeneous proliferation of different-sized cholangiocytes. Large cholangiocytes proliferate by a cAMP-dependent mechanism. The function of small cholangiocytes may depend on the activation of inositol trisphosphate (IP3)/Ca2+-dependent signaling pathways; however, data supporting this speculation are lacking. Four histamine receptors exist (HRH1, HRH2, HRH3, and HRH4). In several cells: 1) activation of HRH1 increases intracellular Ca2+ concentration levels; and 2) increased [Ca2+]i levels are coupled with calmodulin-dependent stimulation of calmod
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Creighton, Judy R., Nanako Masada, Dermot M. F. Cooper, and Troy Stevens. "Coordinate regulation of membrane cAMP by Ca2+-inhibited adenylyl cyclase and phosphodiesterase activities." American Journal of Physiology-Lung Cellular and Molecular Physiology 284, no. 1 (2003): L100—L107. http://dx.doi.org/10.1152/ajplung.00083.2002.

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Activation of store-operated Ca2+ entry inhibits type 6 adenylyl cyclase (EC 4.6.1.1 ; AC6; Yoshimura M and Cooper DM. Proc Natl Acad Sci USA 89: 6712–6720, 1992) activity in pulmonary artery endothelial cells. However, in lung microvascular endothelial cells (PMVEC), which express AC6 and turn over cAMP at a rapid rate, inhibition of global (whole cell) cAMP is not resolved after direct activation of store-operated Ca2+ entry using thapsigargin. Present studies sought to determine whether the high constitutive phosphodiesterase activity in PMVECs rapidly hydrolyzes cAMP so that Ca2+ inhibitio
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Yamaguchi, D. T., J. Green, B. S. Merritt, C. R. Kleeman, and S. Muallem. "Modulation of osteoblast function by prostaglandins." American Journal of Physiology-Renal Physiology 257, no. 5 (1989): F755—F761. http://dx.doi.org/10.1152/ajprenal.1989.257.5.f755.

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The naturally occurring prostaglandins (PGs) were studied with respect to their abilities to change free cytosolic Ca2+ concentrations ([Ca2+]i), adenosine 3',5'-cyclic monophosphate (cAMP) levels, and cell proliferation in the osteoblastic cell line, UMR-106-01, and primary cultures of osteoblasts prepared from neonatal rat calvariae. All PGs tested stimulated an increase in [Ca2+]i, which was mainly due to Ca2+ release from intracellular stores. Measurements of the 50% effective concentration for the different PGs show that the potency ranking for PG-evoked [Ca2+]i increase in these cells is
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Zhang, Lin, Wenyuan Liu, Sufen Li, et al. "Astragaloside IV alleviates renal fibrosis by inhibiting renal tubular epithelial cell pyroptosis induced by urotensin II through regulating the cAMP/PKA signaling pathway." PLOS ONE 19, no. 5 (2024): e0304365. http://dx.doi.org/10.1371/journal.pone.0304365.

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Objective To explore the molecular mechanism of Astragaloside IV (AS-IV) in alleviating renal fibrosis by inhibiting Urotensin II-induced pyroptosis and epithelial-mesenchymal transition of renal tubular epithelial cells. Methods Forty SD rats were randomly divided into control group without operation: gavage with 5ml/kg/d water for injection and UUO model group: gavage with 5ml/kg/d water for injection; UUO+ AS-IV group (gavage with AS-IV 20mg/kg/d; and UUO+ losartan potassium group (gavage with losartan potassium 10.3mg/kg/d, with 10 rats in each group. After 2 weeks, Kidney pathology, serum
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Leaver, Eric V., та Pamela A. Pappone. "β-Adrenergic potentiation of endoplasmic reticulum Ca2+ release in brown fat cells". American Journal of Physiology-Cell Physiology 282, № 5 (2002): C1016—C1024. http://dx.doi.org/10.1152/ajpcell.00204.2001.

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We find that the adrenergic agonist isoproterenol increases intracellular Ca2+ concentration ([Ca2+]i) in cultured rat brown adipocytes. At the concentration used (10 μM), isoproterenol-induced Ca2+ responses were sensitive to block by either α1- or β-adrenergic antagonists, suggesting an interaction between these receptor subtypes. Despite reliance on β-adrenoceptor activation, the Ca2+ response was not due solely to increases in cAMP because, administered alone, the selective β3-adrenergic agonist BRL-37344 or forskolin did not increase [Ca2+]i. However, increased cAMP elicited vigorous [Ca2
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Davis, P. B., C. L. Silski, and A. Perez. "cAMP does not regulate [Ca2+]i in human tracheal epithelial cells in primary culture." Journal of Cell Science 107, no. 10 (1994): 2899–907. http://dx.doi.org/10.1242/jcs.107.10.2899.

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Human tracheal epithelial cells in primary culture respond to different receptor agonists with different peak intracellular calcium concentrations. From resting concentration 138 +/- 13 nM, bradykinin (0.1 microM) produces an increase to a maximum of 835 +/- 195 nM, histamine (10 microM) to 352 +/- 51 nM, and ATP (5-500 microM) to more than 1500 nM. Nine of 14 cultures also responded to isoproterenol (10 microM), though with a smaller increase, to 210 +/- 29 nM. A response was observed with isoproterenol, and epinephrine, but not norepinephrine, phenylephrine or methoxamine, was inhibited by p
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Yarwood, S. J. "Microtubule-associated proteins (MAPs) regulate cAMP signalling through exchange protein directly activated by cAMP (EPAC)." Biochemical Society Transactions 33, no. 6 (2005): 1327–29. http://dx.doi.org/10.1042/bst0331327.

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cAMP is an essential signalling molecule whose concentration in cells is regulated by a wide range of hormones. A large number of diseases, including cancer and asthma, are linked to improper regulation of the cAMP signalling system, and manipulation of cAMP levels by pharmaceutical agents has proven therapeutic benefit. The action of cAMP in cells is mediated through the signalling enzymes PKA (protein kinase A) and EPAC (exchange protein directly activated by cAMP). The study of the function of these proteins is essential to understand the role of cAMP in controlling disease. We have found t
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Jung, Seung-Ryoung, Mean-Hwan Kim, Bertil Hille, Toan D. Nguyen, and Duk-Su Koh. "Regulation of exocytosis by purinergic receptors in pancreatic duct epithelial cells." American Journal of Physiology-Cell Physiology 286, no. 3 (2004): C573—C579. http://dx.doi.org/10.1152/ajpcell.00350.2003.

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In epithelial cells, several intracellular signals regulate the secretion of large molecules such as mucin via exocytosis and the transport of ions through channels and transporters. Using carbon fiber amperometry, we previously reported that exocytosis of secretory granules in dog pancreatic duct epithelial cells (PDEC) can be stimulated by pharmacological activation of cAMP-dependent protein kinase (PKA) or protein kinase C (PKC), as well as by an increase of intracellular free Ca2+ concentration ([Ca2+]i). In this study, we examined whether exocytosis in these cells is modulated by activati
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Sudlow, Leland C., and Rhanor Gillette. "Cyclic AMP Levels, Adenylyl Cyclase Activity, and Their Stimulation by Serotonin Quantif ied in Intact Neurons." Journal of General Physiology 110, no. 3 (1997): 243–55. http://dx.doi.org/10.1085/jgp.110.3.243.

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In molluscan central neurons that express cAMP-gated Na+ current (INa,cAMP), estimates of the cAMP binding affinity of the channels have suggested that effective native intracellular cAMP concentrations should be much higher than characteristic of most cells. Using neurons of the marine opisthobranch snail Pleurobranchaea californica, we applied theory and conventional voltage clamp techniques to use INa,cAMP to report basal levels of endogenous cAMP and adenylyl cyclase, and their stimulation by serotonin. Measurements were calibrated to iontophoretic cAMP injection currents to enable express
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Rich, Thomas C., Kent A. Fagan, Hiroko Nakata, Jerome Schaack, Dermot M. F. Cooper, and Jeffrey W. Karpen. "Cyclic Nucleotide–Gated Channels Colocalize with Adenylyl Cyclase in Regions of Restricted Camp Diffusion." Journal of General Physiology 116, no. 2 (2000): 147–62. http://dx.doi.org/10.1085/jgp.116.2.147.

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Cyclic AMP is a ubiquitous second messenger that coordinates diverse cellular functions. Current methods for measuring cAMP lack both temporal and spatial resolution, leading to the pervasive notion that, unlike Ca2+, cAMP signals are simple and contain little information. Here we show the development of adenovirus-expressed cyclic nucleotide–gated channels as sensors for cAMP. Homomultimeric channels composed of the olfactory α subunit responded rapidly to jumps in cAMP concentration, and their cAMP sensitivity was measured to calibrate the sensor for intracellular measurements. We used these
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Kurahashi, T., and A. Kaneko. "Gating properties of the cAMP‐gated channel in toad olfactory receptor cells." Journal of Physiology 466, no. 1 (1993): 287–302. http://dx.doi.org/10.1113/jphysiol.1993.sp019721.

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1. Inside‐out membrane patches were excised from different parts of isolated olfactory receptor cells of the toad, and the gating properties of cAMP‐gated channels were investigated under low concentrations of divalent cations. 2. At +50 mV, an outward current was observed when 1 mM cAMP was applied to the cytoplasmic side of membrane patches excised from cilia. cGMP had a similar effect. The dose‐response relation for the cAMP‐induced current could be fitted with the Hill equation with a coefficient of 1.5 for both cAMP and cGMP, and half‐maximal concentration (K1/2) values of 19 microM (cAMP
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Safitri, Dewi, Matthew Harris, Harriet Potter, et al. "Elevated intracellular cAMP concentration mediates growth suppression in glioma cells." Biochemical Pharmacology 174 (April 2020): 113823. http://dx.doi.org/10.1016/j.bcp.2020.113823.

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Banerjee, Jheelam, Antje Bruckbauer, Teresa Thorpe, and Michael B. Zemel. "Biphasic Effect of Sildenafil on Energy Sensing is Mediated by Phosphodiesterases 2 and 3 in Adipocytes and Hepatocytes." International Journal of Molecular Sciences 20, no. 12 (2019): 2992. http://dx.doi.org/10.3390/ijms20122992.

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Sirt1 (Sirtuin 1), AMPK (AMP-activated protein kinase), and eNOS (endothelial nitric oxide synthase) modulate hepatic energy metabolism and inflammation and play a major role in the development of NASH. Cyclic nucleotide phosphodiesterases (PDEs) play an important role in signal transduction by modulating intracellular levels of cyclic nucleotides. We previously found the PDE5 inhibitor sildenafil to synergize with leucine and leucine-metformin combinations in preclinical studies of NASH and obesity. However, efficacy is diminished at higher sildenafil concentrations. Herein, we have successfu
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Van Duijn, B., and P. J. Van Haastert. "Independent control of locomotion and orientation during Dictyostelium discoideum chemotaxis." Journal of Cell Science 102, no. 4 (1992): 763–68. http://dx.doi.org/10.1242/jcs.102.4.763.

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Chemotaxis is cell movement in the direction of a chemical and is composed of two component: movement and directionality. The directionality of eukaryotic chemotaxis is probably derived from orientation: the detection of the spacial gradient of chemoattractant over the cell length. Chemotaxis was investigated in eukaryotic Dictyostelium discoideum cells that were permeabilized by high-voltage discharges. These permeable cells respond chemotactically to extracellular cAMP. However, locomotion is impaired if the Ca2+ concentration is clamped at submicromolar concentrations; interestingly, these
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Chandras, C., T. E. Harris, A. López Bernal, D. R. E. Abayasekara та A. E. Michael. "PTGER1 and PTGER2 receptors mediate regulation of progesterone synthesis and type 1 11β-hydroxysteroid dehydrogenase activity by prostaglandin E2 in human granulosa–lutein cells". Journal of Endocrinology 194, № 3 (2007): 595–602. http://dx.doi.org/10.1677/joe-07-0128.

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In luteinizing granulosa cells, prostaglandin E2 (PGE2) can exert luteotrophic actions, apparently via the cAMP signalling pathway. In addition to stimulating progesterone synthesis, PGE2 can also stimulate oxidation of the physiological glucocorticoid, cortisol, to its inactive metabolite, cortisone, by the type 1 11β-hydroxysteroid dehydrogenase (11βHSD1) enzyme in human granulosa–lutein cells. Having previously shown these human ovarian cells to express functional G-protein coupled, E-series prostaglandin (PTGER)1, PTGER2 and PTGER4 receptors, the aim of this study was to delineate the role
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Hegeman, R. J., van den Eijnden-Schrauwen, and J. J. Emeis. "Adenosine 3’:5’-Cyclic Monophosphate Induces Regulated Secretion of Tissue-Type Plasminogen Activator and von Willebrand Factor from Cultured Human Endothelial Cells." Thrombosis and Haemostasis 79, no. 04 (1998): 853–58. http://dx.doi.org/10.1055/s-0037-1615077.

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SummaryThe effect of compounds increasing intracellular adenosine 3’:5’-cyclic monophosphate [cAMP]i levels (prostacyclin, isoproterenol, forskolin, cholera toxin), and of the cAMP analogs 8-bromo-cAMP and dibutyryl-cAMP, on the regulated secretion (acute release) of tissue-type plasminogen activator (tPA) and von Willebrand factor (vWF) was studied in cultured human umbilical vein endothelial cells (HUVEC).Prostacyclin, isoproterenol and forskolin, which increased [cAMP]i in HUVEC, and the cell-permeant cAMP analog 8-bromo-cAMP induced dose- and time-dependent secretion of tPA and vWF. The ex
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Meng, Jian Ping, Susan Ceryak, Zaheer Aratsu, Loren Jones, Lauren Epstein, and Bernard Bouscarel. "Biphasic regulation by bile acids of dermal fibroblast proliferation through regulation of cAMP production and COX-2 expression level." American Journal of Physiology-Cell Physiology 291, no. 3 (2006): C546—C554. http://dx.doi.org/10.1152/ajpcell.00011.2006.

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We have previously reported that the bile acids chenodeoxycholate (CDCA) and ursodeoxycholate (UDCA) decreased PGE1-induced cAMP production in a time- and dose-dependent manner not only in hepatocytes but also in nonhepatic cells, including dermal fibroblasts. In the present study, we investigated the physiological relevance of this cAMP modulatory action of bile acids. PGE1 induced cAMP production in a time- and dose-dependent manner. Moreover, PGE1 (1 μM), forskolin (1–10 μM), and the membrane-permeable cAMP analog CPT-cAMP (0.1–10 μM) decreased dermal fibroblast proliferation in a dose-depe
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