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. 1991 Apr;11(4):2018–2025. doi: 10.1128/mcb.11.4.2018

Platelet-derived growth factor increases the in vivo activity of phospholipase C-gamma 1 and phospholipase C-gamma 2.

L Sultzman 1, C Ellis 1, L L Lin 1, T Pawson 1, J Knopf 1
PMCID: PMC359888  PMID: 2005895

Abstract

Upon binding to its cell surface receptor, platelet-derived growth factor (PDGF) causes the tyrosine phosphorylation of phospholipase C-gamma 1 (PLC-gamma 1) and stimulates the production of diacylglycerol and inositol 1,4,5-triphosphate. We showed that following stimulation by PDGF, rat-2 cells overexpressing PLC-gamma 1 display an increase in the levels of both tyrosine-phosphorylated PLC-gamma 1 and inositol phosphates compared with the parental rat-2 cells. This increased responsiveness to PDGF is a direct effect of PLC-gamma 1 overexpression, as a cell line expressing similar levels of an enzymatically inactive point mutant of PLC-gamma 1, PLC-gamma 1 335Q, did not show elevated inositol phosphate production in response to PDGF. Hematopoietic cells express PLC-gamma 2, a PLC isoform that is closely related to PLC-gamma 1. When rat-2 cells overexpressing PLC-gamma 2 were treated with PDGF, an increase in both the tyrosine phosphorylation and the in vivo activity of PLC-gamma 2 was observed. Aluminum fluoride (AIF4-), a universal activator of PLC linked to G-proteins, did not produce an increase in the levels of inositol phosphates in either of the overexpressing cell lines compared with parental rat-2 cells, demonstrating that PLC-gamma isoforms respond specifically to a receptor with tyrosine kinase activity.

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