• fyn kinase regulates type ii ptdins 4-kinases in rbl 2h3 cells

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
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    • شماره تماس دبیرخانه رویداد: -
     type ii phosphatidylinositol 4-kinases are implicated in fcεri-mediated signaling cascades leading to release of inflammatory molecules. cross-linking of fcεri on rbl 2h3 cells results in protein tyrosine phosphorylation and activation of type ii ptdins 4-kinase activity. protein tyrosine kinase(s) that phosphorylate type ii ptdins 4-kinase(s) in rbl 2h3 cells remains elusive and is being addressed in this manuscript. anti-fyn kinase antibodies co-immunoprecipitated type ii ptdins 4-kinase activity from fcεri cross-linked rbl 2h3 cells. in reciprocal assays, his-tagged types ii ptdins 4-kinases were shown to pull down fyn kinase. further, anti-fyn immunoprecipitates were shown to phosphorylate type ii ptdins 4-kinase α and β in in vitro assays. pull down studies with gst-fyn-sh2 and gst-fyn-sh3 domains showed that type ii ptdins 4-kinases associate with fyn-sh2 domain. knockdown of fyn kinase in rbl 2h3 cells abrogated activation of type ii ptdins 4-kinase activity in response to fcεri cross-linking and type ii ptdins 4-kinase activity in anti-phosphotyrosine immunoprecipitates. knockdown of fyn kinase was also strongly correlated with a reduction in β-hexosaminidase release in response to fcεri cross-linking. these results suggest that type ii ptdins 4-kinases act downstream of fyn kinase in fcεri signaling cascades and are regulated by fyn kinase.

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