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Involvement of reactive oxygen species in cyclic stretch-induced NF-kappaB activation in human fibroblast cells.

Abstract：

:1 Uniaxial cyclic stretch leads to an upregulation of cyclooxygenase (COX)-2 through increases in the intracellular Ca(2+) concentration via the stretch-activated (SA) channel and following nuclear factor kappa B (NF-kappaB) activation in human fibroblasts. However, the signaling mechanism as to how the elevated Ca(2+) activates NF-kappaB is unknown. In this study, we examined the involvement of reactive oxygen species (ROS) as an intermediate signal, which links the elevated Ca(2+) with NF-kappaB activation. 2 4-Hydroxy-2-nonenal (HNE) was produced and modified IkappaB peaking at 2 min. The phosphorylation of IkappaB peaked at 8 min. HNE modification and IkappaB phosphorylation, NF-kappaB translocation to the nucleus, and following COX-2 production were inhibited by extracellular Ca(2+) removal or Gd(3+) application, as well as by the antioxidants. The stretch-induced Ca(2+) increase was inhibited by extracellular Ca(2+) removal, or Gd(3+) application. 3 IkappaB kinase (IKK) activity peaked at 4 min, which was inhibited by extracellular Ca(2+) removal, Gd(3+) or the antioxidants. IKK was also HNE-modified and, similarly to IkappaB, peaked at 2 min. IKK under static conditions was activated by exogenously applied HNE at a relatively low dose (1 microM), while it was inhibited at higher concentrations, suggesting that HNE could be one of the candidate signals in the stretch-induced NF-kappaB activation. 4 The present study suggests that the NF-kappaB activation by cyclic stretch is mediated by the following signal cascade: SA channel activation --> intracellular Ca(2+) increase --> production of ROS --> activation of IKK --> phosphorylation of IkappaB --> NF-kappaB translocation to the nucleus.

journal_name

Br J Pharmacol

journal_title

British journal of pharmacology

authors

Amma H,Naruse K,Ishiguro N,Sokabe M

doi

10.1038/sj.bjp.0706182

subject

Has Abstract

pub_date

2005-06-01 00:00:00

pages

364-73

issue

3

eissn

0007-1188

issn

1476-5381

pii

0706182

journal_volume

145

pub_type

杂志文章

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