Linked Life Data

9710127

Source:http://linkedlifedata.com/resource/pubmed/id/9710127

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
1998-9-1
pubmed:abstractText
Fluid shear stress alters the morphology and function of the endothelium by activating several kinases. Furthermore, shear stress potently inhibits apoptosis of endothelial cells. Since activation of Akt kinase has been shown to prevent cell death, we investigated the effects of shear stress on Akt phosphorylation. To test the hypothesis that shear stress interacts with the Akt kinase pathway, human umbilical venous endothelial cells were exposed to laminar shear stress (15 dyne/cm2). Western blotting with specific antibodies against the phosphorylated Akt demonstrated a time-dependent stimulation of Akt phosphorylation by shear stress with a maximal increase up to 6-fold after 1 hour of shear stress exposure. The stimulation of Akt phosphorylation by shear stress thereby seemed to be mediated by the phosphoinositide 3-OH kinase (PI3K), as evidenced by the significant inhibition of shear stress-induced Akt phosphorylation by the PI3K inhibitors wortmannin (20 nmol/L) and Ly294002 (10 micromol/L). In addition, pharmacological inhibition of P13K reduced the antiapoptotic effect of shear stress against growth factor depletion-induced apoptosis. Most important, overexpression of a dominant-negative Akt mutant significantly inhibited the apoptosis-suppressive effect of shear stress against serum depletion-induced apoptosis, thus indicating the direct involvement of shear stress-induced Akt phosphorylation for inhibition of endothelial cell apoptosis. These results define a novel shear stress-stimulated signal transduction pathway, namely, activation of the serine/threonine kinase Akt, which may contribute to the profound changes in endothelial morphology and function by shear stress.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Aug
pubmed:issn
0009-7330
pubmed:author
pubmed:issnType
Print
pubmed:day
10
pubmed:volume
83
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
334-41
pubmed:dateRevised
2010-11-18
pubmed:meshHeading
pubmed:year
1998
pubmed:articleTitle
Fluid shear stress stimulates phosphorylation of Akt in human endothelial cells: involvement in suppression of apoptosis.
pubmed:affiliation
Department of Internal Medicine IV, Molecular Cardiology, University of Frankfurt, Germany.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't