title: Epidermal growth factor (EGF) stimulates inositol trisphosphate formation in cells which overexpress the EGF receptor.
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-P3), and other inositol phosphates. The results show that EGF induces rapid formation of Ins-1,4,5-P3 as well as Ins-1,3,4-P3 and Ins-1,3,4,5-P4. There is a concurrent decrease in the level of the lipid precursor for Ins-1,4,5-P3, phosphatidylinositol 4,5-biphosphate (PIP2). 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.
mesh_terms: D002118:Calcium / Q000494:pharmacology; D002460:Cell Line; D004815:Epidermal Growth Factor / Q000494:pharmacology*; D066246:ErbB Receptors / Q000502:physiology*; D015544:Inositol 1,4,5-Trisphosphate; D007295:Inositol Phosphates / Q000096:biosynthesis* / Q000378:metabolism; D007700:Kinetics; D010716:Phosphatidylinositols / Q000378:metabolism; D013403:Sugar Phosphates / Q000096:biosynthesis*; D010738:Type C Phospholipases / Q000378:metabolism
chemical_list: D007295:Inositol Phosphates; D010716:Phosphatidylinositols; D013403:Sugar Phosphates; D004815:Epidermal Growth Factor; D015544:Inositol 1,4,5-Trisphosphate; D066246:ErbB Receptors; D010738:Type C Phospholipases; D002118:Calcium