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- W1784523242 abstract "In the mouse keratinocyte line HEL-30 the epidermal mitogen transforming growth factor-alpha (TGF-alpha) stimulated the rapid release of arachidonic acid in a dose- and time-dependent manner. The liberation of arachidonic acid was due to the activation of a Ca(2+)-dependent cytosolic phospholipase A2 (cPLA2). The activation mechanism critically depended on a functionally active epidermal growth factor receptor tyrosine kinase and occurred independently of phospholipase C-mediated increases in cellular diacylglycerol and inositol 1,4,5-trisphosphate concentrations and protein kinase C activation. The activation included an increase in cytosolic PLA2 (cPLA2) activity and an association of the enzyme with the membrane fraction. Both activation steps apparently occurred in the presence of basal cytoplasmic Ca2+ concentrations. Moreover, cPLA2 or a closely associated protein was found to be phosphorylated on tyrosine upon TGF-alpha challenge of the cells. The data suggest that tyrosine phosphorylation is involved in the TGF-alpha-induced activation of cPLA2." @default.
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- W1784523242 date "1993-08-01" @default.
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- W1784523242 title "Activation of cytosolic phospholipase A2 by transforming growth factor-alpha in HEL-30 keratinocytes" @default.
- W1784523242 doi "https://doi.org/10.1016/s0021-9258(19)85486-8" @default.
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