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. 1990 Dec 15;272(3):761–766. doi: 10.1042/bj2720761

Stimulation of the hydrolysis of phosphatidylinositol 4,5-bisphosphate and phosphatidylcholine by endothelin, a complete mitogen for Rat-1 fibroblasts.

E E MacNulty 1, R Plevin 1, M J Wakelam 1
PMCID: PMC1149774  PMID: 2176477

Abstract

The mitogenic activity of endothelin and its ability to stimulate PtdIns(4,5)P2 and phosphatidylcholine turnover in Rat-1 fibroblasts was studied. Stimulated incorporation of [3H]thymidine occurred in the absence of any other added growth factors. The endothelins stimulated rapid generation of both Ins(1,4,5)P3 and choline. Endothelin-1 and endothelin-2 were equipotent in stimulating both responses, but endothelin-3 was less potent. Endothelin-1-stimulated Ins(1,4,5)P3 generation reached a maximum at 5 s and then declined; however, the response was long-lived, with a 4.5-fold elevation over basal still observed after 15 min. Endothelin-stimulated choline generation was observed with no increase in choline phosphate; indeed, the apparent level of this metabolite fell after 30 min of stimulation, presumably due to the observed stimulation of phosphatidylcholine synthesis. The endothelin-stimulated increase in choline generation was abolished in cells where protein kinase C was down-regulated. However, endothelin-stimulated choline generation was greater than that observed in response to a protein kinase C-activating phorbol ester, raising the possibility that the peptide activates phospholipase D by both protein kinase C-dependent and -independent mechanisms.

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Selected References

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