cGMP inhibits GTP cyclohydrolase I activity and biosynthesis of tetrahydrobiopterin in human umbilical vein endothelial cells

Hiroaki Shiraishi, Taiya Kato, Koji Atsuta, Chiho Sumi-Ichinose, Masatsugu Ohtsuki, Mitsuyasu Itoh, Hitoshi Hishida, Shin Tada, Yasuhiro Udagawa, Toshiharu Nagatsu, Yasumichi Hagino, Hiroshi Ichinose, Takahide Nomura

研究成果: Article査読

7 被引用数 (Scopus)

抄録

Tetrahydrobiopterin (BH4) acts as an essential cofactor for the enzymatic activity of nitric oxide (NO) synthases. Biosynthesis of the cofactor BH4 starts from GTP and requires 3 enzymatic steps, which include GTP cyclohydrolase I (GCH I) catalysis of the first and rate-limiting step. In this study we examined the effects of cGMP on GCH I activity in human umbilical vein endothelial cells under inflammatory conditions. Exogenous application of the cGMP analogue 8-bromo-cGMP markedly inhibited GCH I activity in the short term, whereas an cAMP analogue had no effect on GCH I activity under the same condition. NO donors, NOR3 and sodium nitroprusside, elevated the intracellular cGMP level and reduced GCH I activity in the short term. This inhibition of GCH I activity was obliterated in the presence of an NO trapper carboxy-PTIO. NO donors had no effect on GCH I mRNA expression in the short term. Moreover, cycloheximide did not alter the inhibition by NO donors of GCH I activity. These findings suggest that stimulation of the cGMP signaling cascade down-regulates GCH I activity through post translational modification of the GCH I enzyme.

本文言語English
ページ(範囲)265-271
ページ数7
ジャーナルJournal of Pharmacological Sciences
93
3
DOI
出版ステータスPublished - 11-2003

All Science Journal Classification (ASJC) codes

  • Molecular Medicine
  • Pharmacology

フィンガープリント 「cGMP inhibits GTP cyclohydrolase I activity and biosynthesis of tetrahydrobiopterin in human umbilical vein endothelial cells」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル