Tumor necrosis factor-alpha- and interleukin-1-stimulated intercellular adhesion molecule-1 expression by murine renal tubular epithelial cells is transcriptionally regulated and involves protein kinase C.
The regulation of intercellular adhesion molecule-1 (ICAM-1) expression by renal tubular epithelial cells (TEC) has been studied in vitro. ICAM-1 expression in TEC is stimulated with phorbol 12-myristate 13-acetate (PMA), but not with forskolin, suggesting a role for protein kinase C (PKC) but not for protein kinase A (PKA). The tumor necrosis factor-alpha- (TNF-alpha) and interleukin-1 (IL-1)-stimulated ICAM-1 expression in TEC is blocked with the PKC/PKA inhibitor staurosporine, and also with the PKC-selective inhibitor calphostin C. The TNF-alpha-stimulated ICAM-1 expression is resistant however to downregulation of PKC with PMA. The TNF-alpha- and IL-1-stimulated ICAM-1 expression is also inhibited with the transcriptional inhibitor actinomycin D and with the protein synthesis inhibitor cycloheximide. Thus, ICAM-1 expression by TEC may involve a downregulation-resistant PKC which induces ICAM-1 expression at a transcriptional level.
D000818:Animals; D015703:Antigens, CD / Q000235:genetics; D015815:Cell Adhesion Molecules / Q000235:genetics* / Q000378:metabolism; D002461:Cell Line, Transformed; D004789:Enzyme Activation; D004848:Epithelium; D005786:Gene Expression Regulation / Q000187:drug effects; D018799:Intercellular Adhesion Molecule-1; D007375:Interleukin-1 / Q000494:pharmacology*; D007684:Kidney Tubules / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D051379:Mice; D011493:Protein Kinase C / Q000037:antagonists & inhibitors / Q000378:metabolism*; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology; D014158:Transcription, Genetic / Q000187:drug effects; D014409:Tumor Necrosis Factor-alpha / Q000494:pharmacology*
D015703:Antigens, CD; D015815:Cell Adhesion Molecules; D007375:Interleukin-1; D014409:Tumor Necrosis Factor-alpha; D018799:Intercellular Adhesion Molecule-1; D011493:Protein Kinase C; D013755:Tetradecanoylphorbol Acetate