Endothelin-1 inhibits induction of nitric oxide synthase and gtp cyclohydrolase i in rat mesangial cells

Junichi Hirahashi, Toshio Nakaki, Keiichi Hishikawa, Takeshi Marumo, Toshio Yasumori, Matsuhiko Hayashi, Hiromichi Suzuki, Takao Sarnia

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


To investigate the interaction between endothelin (ET) and the nitric oxide system, we examined the effects of ET-1 and ET-3 on the induction of inducible nitric oxide synthase (iNOS) and guanosine triphosphate cyclohydrolase I (GTP:CHI), the rate-limiting enzyme of de novo synthesis of the cofactor tetrahydrobiopterin (BH4), in rat mesangial cells. ET-1 inhibited the nitrite accumulation induced by a combination of interleukin-1β, tumor necrosis factor-α, and lipo-polysaccharide in a concentration-dependent manner. The inhibitory effect of ET-3 was less potent than that of ET-1. A selective ETA antagonist, BQ-485, and an ETA and ETB antagonist, TAK-044, abolished the inhibitory effects of ET-1, whereas the selective ETB antagonist BQ-788 had no effect on the inhibition produced by ET-1. These observations indicate that ET-1 inhibits cytokine-stimulated nitrite accumulation through the ETA receptor. Western blot analysis showed that the suppression of nitrite accumulation was accompanied by a decrease in iNOS protein. Northern blot analysis showed that ET-1 inhibited the expression of both iNOS and GTP: CHI mRNA. In conclusion, ET-1 inhibits cytokine-stimulated nitric oxide production through the ETA receptor by suppressing the expression of iNOS and GTP: CHI mRNA in rat mesangial cells.

Original languageEnglish
Pages (from-to)241-249
Number of pages9
Issue number4
Publication statusPublished - 1996 Jan 1


  • Endothelin-1
  • Guanosine triphosphate cyclohydrolase I
  • Mesangial cells
  • Nitric oxide synthase

ASJC Scopus subject areas

  • Pharmacology


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