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. 1991 Jun 15;88(12):5453–5456. doi: 10.1073/pnas.88.12.5453

CD3 stimulation causes phosphorylation of phospholipase C-gamma 1 on serine and tyrosine residues in a human T-cell line.

D J Park 1, H W Rho 1, S G Rhee 1
PMCID: PMC51891  PMID: 1828897

Abstract

The human T-cell line Jurkat was found to contain at least two immunologically distinct isoforms of inositol phospholipid-specific phospholipase C (PLC), PLC-beta 1 and PLC-gamma 1. Treatment of Jurkat cells with antibody to CD3 led to phosphorylation of PLC-gamma 1 but not of PLC-beta 1. The phosphorylation of PLC-gamma 1 occurred rapidly and transiently on both serine and tyrosine residues; tyrosine phosphorylation reached a maximum level less than 1 min after stimulation and decreased rapidly, both in the presence and in the absence of orthovanadate. Two-dimensional phosphopeptide map analysis revealed that the major sites of tyrosine and serine phosphorylation in PLC-gamma 1 from activated Jurkat cells are the same as those in PLC-gamma 1 from cells treated with peptide growth factors such as epidermal growth factor and platelet-derived growth factor. Previously, it has been shown that multiple phosphorylation of PLC-gamma 1 by the growth factor receptor tyrosine kinases leads to activation of PLC-gamma 1. Thus, the current data suggest that inositol phospholipid hydrolysis triggered by the T-cell antigen receptor-CD3 complex is due, at least in part, to activation of PLC-gamma 1 and that the mechanism by which this activation is achieved involves phosphorylation of multiple tyrosine residues on PLC-gamma 1 by a nonreceptor tyrosine kinase coupled to the T-cell antigen receptor-CD3 complex.

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