Phosphoinositide 3-kinases in lysophosphatidic acid signaling: regulation and cross-talk with the Ras/mitogen-activated protein kinase pathway - PubMed (original) (raw)
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Phosphoinositide 3-kinases in lysophosphatidic acid signaling: regulation and cross-talk with the Ras/mitogen-activated protein kinase pathway
Armelle Yart et al. Biochim Biophys Acta. 2002.
Abstract
Recent reports have shown that phosphoinositide 3-kinases (PI3Ks) mediate various biological activities of lysophosphatidic acid (LPA), including cell proliferation or survival. In addition, these enzymes have been proposed to be early intermediates of mitogen-activated protein kinase (MAPK) activation. Here we summarize our current knowledge of the mechanisms underlying these observations. p110gamma is an isoform of PI3K that can be activated in vitro by Gbetagamma subunits and was therefore considered as the logical candidate to mediate responses induced by G protein-coupled receptor (GPCR) agonists. In agreement with this, p110gamma has been involved in different biochemical models linking Gbetagamma to MAPK activation. Nevertheless, its apparent tissue-specific distribution has raised questions regarding the physiological relevance of these models. In addition, LPA can activate p110beta, a member of the phosphotyrosine-dependent PI3K subfamily that participates in the mitogenic effect of LPA. Its activation is thought to involve a synergistic effect of Gbetagamma and phosphotyrosine motifs provided by a transactivated EGF receptor/Gab1 pathway. We are currently studying a possible role of p110beta upstream from Ras, suggesting that this protein could provide a novel connection between betagamma and the MAPK pathway.
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