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Duration Of Streptozotocin-Induced Diabetes Differentially Affects P38-Mitogen-Activated Protein Kinase (Mapk) Phosphorylation In Renal And Vascular Dysfunction, H. Chen, S. Brahmbhatt, A. Gupta, Avadhesh C. Sharma Jan 2005

Duration Of Streptozotocin-Induced Diabetes Differentially Affects P38-Mitogen-Activated Protein Kinase (Mapk) Phosphorylation In Renal And Vascular Dysfunction, H. Chen, S. Brahmbhatt, A. Gupta, Avadhesh C. Sharma

PCOM Scholarly Papers

Background: In the present study we tested the hypothesis that progression of streptozotocin (STZ)-induced diabetes (14-days to 28-days) would produce renal and vascular dysfunction that correlate with altered p38- mitogen-activated protein kinase (p38-MAPK) phosphorylation in kidneys and thoracic aorta. Methods: Male Sprague Dawley rats (350-400 g) were randomized into three groups: sham (N = 6), 14-days diabetic (N = 6) and 28-days diabetic rats (N = 6). Diabetes was induced using a single tail vein injection of STZ (60 mg/kg, I.V.) on the first day. Rats were monitored for 28 days and food, water intake and plasma glucose levels were …


Renal Ischemia And Reperfusion Activates The Eif2 Alpha Kinase Perk, Heather L. Montie, Foaz Kayali, Adam J. Haezebrouck, Noreen F. Rossi, Donald J. Degracia Jan 2005

Renal Ischemia And Reperfusion Activates The Eif2 Alpha Kinase Perk, Heather L. Montie, Foaz Kayali, Adam J. Haezebrouck, Noreen F. Rossi, Donald J. Degracia

PCOM Scholarly Papers

Inhibition of protein synthesis occurs in the post-ischemic reperfused kidney but the molecular mechanism of renal translation arrest is unknown. Several pathways have been identified whereby cell stress inhibits translation initiation via phosphorylation of the alpha subunit of eukaryotic initiation factor 2 (eIF2a, phospho-form eIF2a(P)]. Here, we report a 20-fold increase in eIF2a(P) in kidney homogenates following 10 min of cardiac arrest-induced ischemia and 10 min reperfusion. Using immunohistochemistry, we observed eIF2a(P) in tubular epithelial cells in both cortex and medulla, where the greatest eIF2a(P) staining was found in epithelial cells of the so-called watershed area at the corticomedullary junction. …