Superoxide-mediated actin response in post-hypoxic endothelial cells.

Publication Type	Academic Article
Authors	Crawford L, Milliken E, Irani K, Zweier J, Becker L, Johnson T, Eissa N, Crystal R, Finkel T, Goldschmidt-Clermont P
Journal	J Biol Chem
Volume	271
Issue	43
Pagination	26863-7
Date Published	10/25/1996
ISSN	0021-9258
Keywords	Actins, Cell Hypoxia, Endothelium, Vascular, Superoxides
Abstract	The mechanism leading to changes in the superstructure of endothelial cells exposed to ischemia and reperfusion remains uncharacterized. We show that in post-hypoxic endothelial cells, the simple re-addition of oxygen induces a profound reorganization of the actin cytoskeleton. The total filamentous actin pool increases by 41% and translocation of actin filaments to the submembranous network is observed. Concurrent with the actin polymerization, increased tyrosine phosphorylation of endothelial cell substrates is detected on Western blots. Overexpression of superoxide dismutase using replication incompetent adenovirus inhibits the actin and tyrosine phosphorylation responses to reoxygenation. Inhibition of tyrosine kinases with the isoflavone genistein also suppressed the actin polymerization response to reoxygenation, but unlike superoxide dismutase, genistein also induced the collapse of the superstructure of endothelial cells upon reoxygenation. These experiments support the concept that reoxygenation following a period of hypoxia can induce the remodeling of the actin cytoskeleton in endothelial cells. Such a response requires the intact coupling of superoxide producing pathway(s) with tyrosine kinase pathway(s).
DOI	10.1074/jbc.271.43.26863
PubMed ID	8900169