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. 1994 Dec 1;127(5):1477–1483. doi: 10.1083/jcb.127.5.1477

Beta 2 integrin-dependent tyrosine phosphorylation of paxillin in human neutrophils treated with tumor necrosis factor

PMCID: PMC2120254  PMID: 7525608

Abstract

The focal adhesion protein paxillin undergoes tyrosine phosphorylation in response to signals mediated by integrins, neuropeptides and oncogene products, possibly via activation of the focal adhesion- associated kinase, p125FAK. In the present work, tumor necrosis factor- alpha (TNF) stimulated tyrosine phosphorylation of paxillin in human neutrophils. Cell adhesion and participation of the beta 2 integrin CD18 were necessary, but not sufficient, for the response. Adherent neutrophils also tyrosine phosphorylated paxillin in response to phorbol ester, formylmethionyl-leucyl-phenylalanine and opsonized bacteria. In contrast, p125FAK was constitutively tyrosine phosphorylated in a manner unaffected by adherence and/or TNF. Thus, cytokines and microbial products are among the stimuli that can induce the tyrosine phosphorylation of paxillin, and kinases other than p125FAK may be responsible. This is the first identification of paxillin and p125FAK in human cells and neutrophils, and one of the few identifications of a specific protein that undergoes tyrosine phosphorylation in response to any agonist in neutrophils or in response to TNF in any cell.

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Selected References

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