Abstract
EGF is a low molecular weight polypeptide hormone which acts as a regulator of cell growth and differentiation. The A-431 cell line has been used frequently to examine receptor-mediated biochemical effects of EGF, since this cell line has an increased (20–50 fold) level of EGF receptors. We have utilized A-431 cells to examine the influence of EGF on formation of an intracellular second messenger, inositol 1,4,5-trisphosphate (Ins-1,4,5-P 3), and other inositol phosphates. The results show that EGF induces rapid formation of Ins-1,4,5-P 3 as well as Ins-1,3,4-P 3 and Ins-1,3,4,5-P 4. There is a concurrent decrease in the level of the lipid precursor for Ins-1,4,5-P 3, phosphatidylinositol 4,5-bisphosphate (PIP 2). Furthermore, we have examined five other cell lines that overexpress the EGF receptor and find that EGF treatment induces formation of inositol polyphosphates in those cell lines also.
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