Shear Stress Regulates Endothelial Nitric-oxide Synthase Promoter Activity through Nuclear Factor κB Binding

Michael E. Davis, Isabella M. Grumbach, Tohru Fukai, Alexis Cutchins, David G. Harrison

Research output: Contribution to journalArticle

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Abstract

We have previously demonstrated that shear stress increases transcription of the endothelial nitric-oxide synthase (eNOS) by a pathway involving activation of the tyrosine kinase c-Src and extracellular signal-related kinase 1/2 (ERK1/2). In the present study sought to determine the events downstream of this pathway. Shear stress activated a human eNOS promoter chloramphenicol acetyl-CoA transferase chimeric construct in a time-dependent fashion, and this could be prevented by inhibition of the c-Src and MEK1/2. Studies using electromobility shift assays, promoter deletions, and promoter mutations revealed that shear activation of the eNOS promoter was due to binding of nuclear factor κB subunits p50 and p65 to a GAGACC sequence -990 to -984 base pairs upstream of the eNOS transcription start site. Shear induced nuclear translocation of p50 and p65, and activation of the eNOS promoter by shear could be prevented by co-transfection with a dominant negative I kappa Bα. Exposure of endothelial cells to shear resulted in Iκ kinase phosphorylation, and this was blocked by the MEK1/2 inhibitor PD98059 and the cSrc inhibitor PP1, suggesting these signaling molecules are upstream of NFκB activation. These experiments indicate that shear stress increases eNOS transcription by NFκB activation and p50/p65 binding to a GAGACC sequence present of the human eNOS promoter. While NFκB activation is generally viewed as a proinflammatory stimulus, the current data indicate that its transient activation by shear may increase expression of eNOS, which via production of nitric oxide could convey anti-inflammatory and anti-atherosclerotic properties.

Original languageEnglish (US)
Pages (from-to)163-168
Number of pages6
JournalJournal of Biological Chemistry
Volume279
Issue number1
DOIs
StatePublished - Jan 2 2004
Externally publishedYes

Fingerprint

Nitric Oxide Synthase Type III
Shear stress
Chemical activation
Transcription
I-kappa B Proteins
Phosphotransferases
Coenzyme A-Transferases
Acetyl Coenzyme A
Phosphorylation
Sequence Deletion
Transcription Initiation Site
Endothelial cells
Chloramphenicol
Base Pairing
Transcriptional Activation
Transfection
Assays
Nitric Oxide
Anti-Inflammatory Agents
Endothelial Cells

ASJC Scopus subject areas

  • Biochemistry

Cite this

Shear Stress Regulates Endothelial Nitric-oxide Synthase Promoter Activity through Nuclear Factor κB Binding. / Davis, Michael E.; Grumbach, Isabella M.; Fukai, Tohru; Cutchins, Alexis; Harrison, David G.

In: Journal of Biological Chemistry, Vol. 279, No. 1, 02.01.2004, p. 163-168.

Research output: Contribution to journalArticle

Davis, Michael E. ; Grumbach, Isabella M. ; Fukai, Tohru ; Cutchins, Alexis ; Harrison, David G. / Shear Stress Regulates Endothelial Nitric-oxide Synthase Promoter Activity through Nuclear Factor κB Binding. In: Journal of Biological Chemistry. 2004 ; Vol. 279, No. 1. pp. 163-168.
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