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. 2000 Jan 15;345(Pt 2):385–392.

Role of phosphoinositide 3-kinase and the Cbl adaptor protein in coupling the alpha4beta1 integrin to mitogen-activated protein kinase signalling.

L D Finkelstein 1, Y Shimizu 1
PMCID: PMC1220768  PMID: 10620516

Abstract

Cell adhesion mediated by beta1 integrin receptors leads to the initiation of intracellular signals that affect cell differentiation and survival. Here we have analysed the mechanism by which the alpha4beta1 integrin activates the mitogen-activated protein kinase pathway in HL60 cells, a myelomonocytic cell line that lacks the expression of focal adhesion kinase. A role for phosphoinositide 3-kinase (PI-3K) in alpha4 integrin-mediated activation of extracellular signal-regulated protein kinase 2 (ERK2) is suggested by the ability of PI-3K inhibitors and a dominant-negative form of the p85 subunit of PI-3K to block the activation of ERK2 by integrin. Stimulation of alpha4beta1 integrins on HL60 cells also leads to increased tyrosine phosphorylation of the 120 kDa adaptor protein Cbl. PI-3K activity associated with Cbl also increases on the stimulation of alpha4beta1 integrins, although immunodepletion experiments suggest that Cbl-associated PI-3K does not account for all of the PI-3K activity induced on the stimulation of integrins in these cells. The expression of wild-type Cbl or the 70Z/3 Cbl mutant enhances basal ERK2 activity in transfectants with a minimal effect on alpha4 integrin-mediated ERK2 activity. In contrast, overexpression of the Hut Cbl truncation mutant, which does not associate with p85, has no effect on the ERK2 pathway. These results suggest that PI-3K has a major role in coupling alpha4beta1 integrins to ERK2 activation in myeloid cells and that the Cbl adaptor protein has a role in basal, but not alpha4beta1 integrin-mediated, activation of ERK2.

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Selected References

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