PMID: 7544689Jun 1, 1995Paper

Nitric oxide synthesis in cardiac myocytes and fibroblasts by inflammatory cytokines

Cardiovascular Research
T ShindoK Shimada

Abstract

The aim was to investigate nitric oxide (NO) synthase activity in cultured neonatal rat cardiac myocytes and fibroblasts upon treatment with inflammatory cytokines interleukin 1 beta (IL-1 beta), tumour necrosis factor alpha (TNF-alpha), IL-2, IL-6, IL-8, transforming growth factor beta (TGF-beta) and gram negative bacterial lipopolysaccharide (LPS). NO and guanosine 3',5'-cyclic monophosphate (cGMP) synthesis was measured in cultured neonatal rat cardiac myocytes and fibroblasts, using Griess reagent and an enzyme immunoassay kit, respectively. The expression of inducible NO synthase (iNOS) mRNA and protein was assayed by northern and western blotting, respectively. Incubation of cardiac myocytes for 24 h with IL-1 beta (10 ng.ml-1) or LPS (1 microgram.ml-1) caused significant increases in NO and cGMP production. TNF-alpha, IL-2, IL-6, IL-8, and TGF-beta showed no significant effect on their production. IL-1 beta induced NO and cGMP production in a time and dose dependent manner. IL-1 beta also increased iNOS mRNA and protein accumulation in cardiac myocytes. Simultaneous incubation of IL-1 beta with NG-monomethyl-L-arginine, genistein, calphostin C, cycloheximide, or actinomycin D completely inhibited the IL-1 beta induced NO...Continue Reading

Citations

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