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Articles 481 - 490 of 490
Full-Text Articles in Chemicals and Drugs
Hypertonic Stress Co-Stimulates T Cell Il-2 Expression Through A Feedback Mechanism Involving Atp Release And P2 Receptor Activation Of P38 Map Kinase, William H. Loomis, Sachiko Namiki, Rennolds S. Ostrom, Paul A. Insel, Wolfgang G. Junger
Hypertonic Stress Co-Stimulates T Cell Il-2 Expression Through A Feedback Mechanism Involving Atp Release And P2 Receptor Activation Of P38 Map Kinase, William H. Loomis, Sachiko Namiki, Rennolds S. Ostrom, Paul A. Insel, Wolfgang G. Junger
Pharmacy Faculty Articles and Research
Hypertonic stress (HS) can alter the function of mammalian cells. We have reported that HS enhances differentiated responses of T cells by increasing their ability to produce interleukin (IL)-2, a finding of clinical interest because hypertonic infusions may modulate immune function in patients. HS shrinks cells and mechanically deforms membranes, which results in ATP release from many cell types. Here we investigate if ATP release is an underlying mechanism through which HS augments T cell function. We found that mechanical stress and HS induced rapid ATP release from Jurkat T cells. HS and exogenous ATP mobilized intracellular Ca2+, activated p38 …
Angiotensin Ii Enhances Adenylyl Cyclase Signaling Via Ca2+/Calmodulin. Gq-Gs Cross-Talk Regulates Collagen Production In Cardiac Fibroblasts, Rennolds S. Ostrom, Jennifer E. Naugle, Miki Hase, Caroline Gregorian, James S. Swaney, Paul A. Insel, Laurence L. Brunton, J. Gary Meszaros
Angiotensin Ii Enhances Adenylyl Cyclase Signaling Via Ca2+/Calmodulin. Gq-Gs Cross-Talk Regulates Collagen Production In Cardiac Fibroblasts, Rennolds S. Ostrom, Jennifer E. Naugle, Miki Hase, Caroline Gregorian, James S. Swaney, Paul A. Insel, Laurence L. Brunton, J. Gary Meszaros
Pharmacy Faculty Articles and Research
Cardiac fibroblasts regulate formation of extracellular matrix in the heart, playing key roles in cardiac remodeling and hypertrophy. In this study, we sought to characterize cross-talk between Gq and Gs signaling pathways and its impact on modulating collagen synthesis by cardiac fibroblasts. Angiotensin II (ANG II) activates cell proliferation and collagen synthesis but also potentiates cyclic AMP (cAMP) production stimulated by β-adrenergic receptors (β-AR). The potentiation of β-AR-stimulated cAMP production by ANG II is reduced by phospholipase C inhibition and enhanced by overexpression of Gq. Ionomycin and thapsigargin increased intracellular Ca2+ levels and potentiated isoproterenol- and forskolin-stimulated cAMP production, whereas …
Human Cytomegalovirus Chemokine Receptor Us28-Induced Smooth Muscle Cell Migration Is Mediated By Focal Adhesion Kinase And Src, Daniel N. Streblow, Jennifer Totonchy, Patsy Smith, Ryan Melnychuk, Laurel Hall, Dora Pancheva, Martine Smit, Paola Casarosa, David D. Schlaepfer, Jay A. Nelson
Human Cytomegalovirus Chemokine Receptor Us28-Induced Smooth Muscle Cell Migration Is Mediated By Focal Adhesion Kinase And Src, Daniel N. Streblow, Jennifer Totonchy, Patsy Smith, Ryan Melnychuk, Laurel Hall, Dora Pancheva, Martine Smit, Paola Casarosa, David D. Schlaepfer, Jay A. Nelson
Pharmacy Faculty Articles and Research
The human cytomegalovirus-encoded chemokine receptor US28 induces arterial smooth muscle cell (SMC) migration; however, the underlying mechanisms involved in this process are unclear. We have previously shown that US28-mediated SMC migration occurs by a ligand-dependent process that is sensitive to proteintyrosine kinase inhibitors. We demonstrate here that US28 signals through the non-receptor protein-tyrosine kinases Src and focal adhesion kinase (FAK) and that this activity is necessary for US28-mediated SMC migration. In the presence of RANTES (regulated on activation normal T cell expressed and secreted), US28 stimulates the production of a FAK Src kinase complex. Interestingly, Src co-immunoprecipitates with US28 in …
Dextran-Methylprednisolone Succinate As A Prodrug Of Methylprednisolone: Plasma And Tissue Disposition, Xiaoping Zhang, Reza Mehvar
Dextran-Methylprednisolone Succinate As A Prodrug Of Methylprednisolone: Plasma And Tissue Disposition, Xiaoping Zhang, Reza Mehvar
Pharmacy Faculty Articles and Research
Plasma and tissue disposition of a macromolecular prodrug of methylprednisolone (MP), dextran (70 kDa)–methylprednisolone succinate (DMP), was studied in rats. Single 5‐mg/kg doses of DMP or unconjugated MP were administered into the tail veins of different groups of rats (n = 4/group/time point). Blood (cardiac puncture) and tissues (liver, spleen, kidney, heart, lung, thymus, and brain) were collected at various times after DMP (0–96 h) or MP (0–2 h) injections. Concentrations of DMP and MP in samples were analyzed by size‐exclusion chromatography (SEC) and reversed‐phase high‐performance liquid chromatography (HPLC), respectively. Conjugation of MP with 70‐kDa dextran resulted in 22‐, …
Receptor Number And Caveolar Co-Localization Determine Receptor Coupling Efficiency To Adenylyl Cyclase, Rennolds S. Ostrom, Caroline Gregorian, Ryan M. Drenan, Yang Xiang, John W. Regan, Paul A. Insel
Receptor Number And Caveolar Co-Localization Determine Receptor Coupling Efficiency To Adenylyl Cyclase, Rennolds S. Ostrom, Caroline Gregorian, Ryan M. Drenan, Yang Xiang, John W. Regan, Paul A. Insel
Pharmacy Faculty Articles and Research
Recent evidence suggests that many signaling molecules localize in microdomains of the plasma membrane, particularly caveolae. In this study, overexpression of adenylyl cyclase was used as a functional probe of G protein-coupled receptor (GPCR) compartmentation. We found that three endogenous receptors in neonatal rat cardiomyocytes couple with different levels of efficiency to the activation of adenylyl cyclase type 6 (AC6), which localizes to caveolin-rich membrane fractions. Overexpression of AC6 enhanced the maximal cAMP response to β1-adrenergic receptor (β1AR)-selective activation 3.7-fold, to β2AR-selective activation only 1.6-fold and to prostaglandin E2 (PGE2) not at all. Therefore, the rank order of efficacy in …
Cellular Release Of And Response To Atp As Key Determinants Of The Set-Point Of Signal Transduction Pathways, Rennolds S. Ostrom, Caroline Gregorian, Paul A. Insel
Cellular Release Of And Response To Atp As Key Determinants Of The Set-Point Of Signal Transduction Pathways, Rennolds S. Ostrom, Caroline Gregorian, Paul A. Insel
Pharmacy Faculty Articles and Research
The determinants of “basal” activity of signaling pathways regulating cellular responses are poorly defined. One possibility is that cells release factors to establish the set-point of such pathways. Here we show that treatment of Madin-Darby canine kidney cells with the nucleotidase apyrase decreases basal arachidonic acid release and cAMP production 30–40% and that inhibitors of P2Y receptor action also affect basal and forskolin-stimulated cAMP accumulation. Changing medium prominently increases extracellular levels of ATP in Madin-Darby canine kidney, COS-7, and HEK-293 cells. Mechanical stimulation of ATP release likely occurs in virtually every experimental protocol with cultured cells, implicating such release and …
Protein Adducts Of Iso[4]Levuglandin E2, A Product Of The Isoprostane Pathway, In Oxidized Low Density Lipoprotein, Robert G. Salomon, Wei Sha, Cynthia Brame, Kamaljit Kaur, Ganesamoorthy Subbanagounder, June O'Neil, Henry F. Hoff, L. Jackson Roberts Ii
Protein Adducts Of Iso[4]Levuglandin E2, A Product Of The Isoprostane Pathway, In Oxidized Low Density Lipoprotein, Robert G. Salomon, Wei Sha, Cynthia Brame, Kamaljit Kaur, Ganesamoorthy Subbanagounder, June O'Neil, Henry F. Hoff, L. Jackson Roberts Ii
Pharmacy Faculty Articles and Research
Levuglandin (LG) E2, a cytotoxic seco prostanoic acid co-generated with prostaglandins by nonenzymatic rearrangements of the cyclooxygenase-derived endoperoxide, prostaglandin H2, avidly binds to proteins. That LGE2-protein adducts can also be generated nonenzymatically is demonstrated by their production during free radical-induced oxidation of low density lipoprotein (LDL). Like oxidized LDL, LGE2-LDL, but not native LDL, undergoes receptor-mediated uptake and impaired processing by macrophage cells. Since radical-induced lipid oxidation produces isomers of prostaglandins, isoprostanes (isoPs), via endoperoxide intermediates, we postulated previously that a similar family of LG isomers, isoLGs, is cogenerated with isoPs. Now …
Inhibition Of Cpla2-Mediated Arachidonic Acid Release By Cyclic Amp Defines A Negative Feedback Loop For P2y-Receptor Activation In Mdck-D1 Cells, Mingzhao Xing, Steven Post, Rennolds S. Ostrom, Michael Samardzija, Paul A. Insel
Inhibition Of Cpla2-Mediated Arachidonic Acid Release By Cyclic Amp Defines A Negative Feedback Loop For P2y-Receptor Activation In Mdck-D1 Cells, Mingzhao Xing, Steven Post, Rennolds S. Ostrom, Michael Samardzija, Paul A. Insel
Pharmacy Faculty Articles and Research
In Madin-Darby canine kidney D1cells extracellular nucleotides activate P2Y receptors that couple to several signal transduction pathways, including stimulation of multiple phospholipases and adenylyl cyclase. For one class of P2Y receptors, P2Y2 receptors, this stimulation of adenylyl cyclase and increase in cAMP occurs via the conversion of phospholipase A2 (PLA2)-generated arachidonic acid (AA) to prostaglandins (e.g. PGE2). These prostaglandins then stimulate adenylyl cyclase activity, presumably via activation of prostanoid receptors. In the current study we show that agents that increase cellular cAMP levels (including PGE2, forskolin, and the β-adrenergic agonist isoproterenol) can inhibit P2Y receptor-promoted AA release. The protein kinase …
What Is The Risk Of Teratogenicity With The Use Of Selective Serotonin Reuptake Inhibitors During Pregnancy?, Michael Z. Wincor, Mary Gutierrez, Ann Nguyen
What Is The Risk Of Teratogenicity With The Use Of Selective Serotonin Reuptake Inhibitors During Pregnancy?, Michael Z. Wincor, Mary Gutierrez, Ann Nguyen
Pharmacy Faculty Articles and Research
"The lifetime prevalence of major depressive disorder in women is 10 to 25%, with an average age of onset in the mid-20s.1 Over the nine years that the selective serotonin reuptake inhibitors (SSRis) have been available, for many prescribers, they have become first-line agents in the treatment of depression. In addition, sorne of them are also being used in the treatment of obsessive- compulsive disorder and panic disorder. In light of these facts, itis not unlikely that women of childbearing age would be treated with one of the SSRis. In considering the risks of exposing a fetus to an SSRI, …
Fatty Liver And Metabolism Of Xenobiotics In The Rat, Joyce D. Stone
Fatty Liver And Metabolism Of Xenobiotics In The Rat, Joyce D. Stone
Theses and Dissertations (ETD)
No abstract provided.