Bi-phasic activation of eNOS in response to uni-axial cyclic stretch is mediated by differential mechanisms in BAECs

Hideo Takeda, Kimihiro Komori, Naomichi Nishikimi, Yuji Nimura, Masahiro Sokabe, Keiji Naruse

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

We investigated the signaling mechanism of stretch-induced NO (Nitric oxide) production in bovine arterial endothelial cells (BAECs). BAECs cultured on an elastic silicone chamber coated with fibronectin were subjected to uni-axial cyclic stretch (1 Hz, 20% in length) and the amount of produced NO was measured by a cGMP assay. NO production increased in a bi-phasic manner and peaked at 5 min and 20 min after stretch onset. Correspondingly, the activities of endothelial nitric oxide synthase (eNOS) and Akt/PKB (measured by phosphorylation at serine 1177 and serine 473, respectively), showed two peaks over time. Application of Gd3+, a potent SA channel blocker, and depletion of external Ca2+ exclusively inhibited the first peaks of eNOS and Akt activity, but exerted little effect on the second peak. On the other hand, the PI3K inhibitors, Wortmannin, LY294002, almost completely inhibited the second peak but not the first. These results suggest that up-regulation of eNOS in response to cyclic stretch was mediated by two distinct pathways, [Ca2+]i increases via the SA channel in an early phase (partially Akt/PKB), and PI3K-Akt/PKB pathways in a late phase.

Original languageEnglish
Pages (from-to)233-239
Number of pages7
JournalLife Sciences
Volume79
Issue number3
DOIs
Publication statusPublished - Jun 13 2006

Keywords

  • Endothelial cells
  • Intracellular calcium
  • Nitric oxide
  • PI3K
  • Stretch-activated channel

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Pharmacology, Toxicology and Pharmaceutics(all)

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