(Hypertension. 1997;29:65.)
© 1997 American Heart Association, Inc.
Research Articles (Issue 1, Part 1) |
the Department of Cardiology, Jichi Medical School, Minamikawachi, Tochigi, Japan.
Correspondence to Uichi Ikeda, MD, PhD, Department of Cardiology, Jichi Medical School, Minamikawachi-Machi, Tochigi 329-04, Japan. E-mail uikeda@jichi.ac.jp
We investigated the effects of endothelin-1 on nitric oxide synthesis in vascular smooth muscle cells. We measured the production of nitrite, a stable metabolite of nitric oxide, and the expression of inducible nitric oxide synthase mRNA and protein in cultured rat vascular smooth muscle cells. Incubation of the cultures with interleukin-1ß (10 ng/mL) for 24 hours caused a significant increase in nitrite production. Endothelin-1 significantly decreased the interleukin-1ßinduced nitrite production by vascular smooth muscle cells in a dose-dependent manner (10-11 to 10-8 mol/L). Incubation with interleukin-1ß for 24 hours induced expression of inducible nitric oxide synthase mRNA and protein in vascular smooth muscle cells, whereas endothelin-1 showed a suppressive effect on their expressions. Addition of the endothelin type A receptor antagonist BQ-485, but not the endothelin type B receptor antagonist BQ-788, dose-dependently inhibited the effect of endothelin-1. After protein kinase C activity was functionally depleted by treatment of cells with phorbol 12-myristate 13-acetate for 24 hours, the effect of endothelin-1 was abolished. These results indicate that endothelin-1 acts on endothelin type A receptors and inhibits nitric oxide synthesis in interleukin-1ßstimulated vascular smooth muscle cells at least partially through a protein kinase Cdependent pathway.
Key Words: interleukin-1 nitrites nitric-oxide synthase muscle, smooth
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