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. 1990 Sep 1;270(2):337–344. doi: 10.1042/bj2700337

Evidence that the epidermal growth factor receptor and non-tyrosine kinase hormone receptors stimulate phosphoinositide hydrolysis by independent pathways.

J R Hepler 1, R A Jeffs 1, W R Huckle 1, H E Outlaw 1, S G Rhee 1, H S Earp 1, T K Harden 1
PMCID: PMC1131726  PMID: 1698055

Abstract

We have shown previously that exposure of a non-transformed continuous line of rat liver epithelial (WB) cells to epidermal growth factor (EGF), adrenaline, angiotensin II or [Arg8]vasopressin results in an accumulation of the inositol phosphates InsP1, InsP2 and InsP3 [Hepler, Earp & Harden (1988) J. Biol. Chem. 263, 7610-7619]. Studies were carried out with WB cells to determine whether the EGF receptor and other, non-tyrosine kinase, hormone receptors stimulate phosphoinositide hydrolysis by common, overlapping or separate pathways. The time courses for accumulation of inositol phosphates in response to angiotensin II and EGF were markedly different. Whereas angiotensin II stimulated a very rapid accumulation of inositol phosphates (maximal by 30 s), increases in the levels of inositol phosphates in response to EGF were measurable only following a 30 s lag period; maximal levels were attained by 7-8 min. Chelation of extracellular Ca2+ with EGTA did not modify this relative difference between angiotensin II and EGF in the time required to attain maximal phospholipase C activation. Under experimental conditions in which agonist-induced desensitization no longer occurred in these cells, the inositol phosphate responses to EGF and angiotensin II were additive, whereas those to angiotensin II and [Arg8]vasopressin were not additive. In crude WB lysates, angiotensin II, [Arg8]vasopressin and adrenaline each stimulated inositol phosphate formation in a guanine-nucleotide-dependent manner. In contrast, EGF failed to stimulate inositol phosphate formation in WB lysates in the presence or absence of guanosine 5'-[gamma-thio]triphosphate (GTP[S]), even though EGF retained the capacity to bind to and stimulate tyrosine phosphorylation of its own receptor. Pertussis toxin, at concentrations that fully ADP-ribosylate and functionally inactivate the inhibitory guanine-nucleotide regulatory protein of adenylate cyclase (Gi), had no effect on the capacity of EGF or hormones to stimulate inositol phosphate accumulation. In intact WB cells, the capacity of EGF, but not angiotensin II, to stimulate inositol phosphate accumulation was correlated with its capacity to stimulate tyrosine phosphorylation of the 148 kDa isoenzyme of phospholipase C. Taken together, these findings suggest that, whereas angiotensin II, [Arg8]vasopressin and alpha 1-adrenergic receptors are linked to activation of one or more phospholipase(s) C by an unidentified G-protein(s), the EGF receptor stimulates phosphoinositide hydrolysis by a different pathway, perhaps as a result of its capacity to stimulate tyrosine phosphorylation of phospholipase C-gamma.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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