PMID: 7536714Apr 1, 1995Paper

Cyclosporin A inhibits nitric oxide synthase induction in vascular smooth muscle cells

Hypertension
T MarumoT Saruta

Abstract

The effect of cyclosporin A on induction of nitric oxide synthase in rat aortic smooth muscle cells was examined. A combination of interleukin-1 alpha (100 U/mL) and tumor necrosis factor--alpha (5000 U/mL) induced accumulation of nitrite/nitrate, the stable end products of nitric oxide, in culture media within 48 hours. Cyclosporin A inhibited this nitrite/nitrate accumulation in a concentration-dependent manner with an IC50 of 4 x 10(-7) mol/L when applied simultaneously with the cytokines. The expression of inducible nitric oxide synthase messenger RNA (mRNA) induced by the combination of interleukin-1 alpha and tumor necrosis factor-alpha was inhibited by the cyclosporin A cotreatment. Cyclosporin A did not decrease inducible nitric oxide synthase mRNA stability in the presence of transcription inhibitor actinomycin D (5 micrograms/mL). Induction of nitrite/nitrate production by the combination of tumor necrosis factor-alpha and bacterial lipopolysaccharide or that of interleukin-1 alpha and interferon gamma (100 U/mL) was also inhibited by cyclosporin A cotreatment. Another inhibitor of calcineurin, FK506 (up to 10(-6) mol/L), had no effect on the induction of nitrite/nitrate production, suggesting the possibility that the...Continue Reading

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Citations

Aug 12, 1998·Atherosclerosis·T MatsumotoK Kanmatsuse
Mar 20, 2002·Pharmacology, Biochemistry, and Behavior·Houman HomayounAhmad Reza Dehpour
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