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T Scott-Burden, E Elizondo, T Ge, CM Boulanger and PM Vanhoutte
Center for Experimental Therapeutics, Baylor College of Medicine, Houston, Texas 77030.
Rat aortic smooth muscle cells produced large quantities of nitric oxide (NO) after exposure to interleukin-1 beta, and this was depressed in the presence of the protein kinase C inhibitor bisindolylmaleimide. Intracellular cAMP levels were elevated mildly in cytokine-treated smooth muscle cells, and the presence of forskolin enhanced both the cAMP levels and NO production. Inhibition of GTP:cyclohydrolase I by 2,4-diamino-6-hydroxypyrimidine attenuated NO production by interleukin- 1 beta-treated cells. GTP:cyclohydrolase is the regulatory enzyme for de novo tetrahydrobiopterin synthesis, and the latter is a required cofactor for NO synthase activity. Treatment of smooth muscle cells with forskolin induced GTP:cyclohydrolase mRNA expression, and simultaneous treatment of cells with forskolin and phorbol esters elicited NO production. Angiotensin II and arginine-vasopressin, acknowledged agonists for protein kinase C, elicited production of NO by forskolin-treated smooth muscle cells. These observations confirm the importance of GTP:cyclohydrolase activity for NO production by cultured smooth muscle cells and implicate both adenylyl cyclase and protein kinase C in this process.
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