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. 1994 Oct;14(10):6727–6735. doi: 10.1128/mcb.14.10.6727

Stimulation of the platelet-derived growth factor beta receptor signaling pathway activates protein kinase C-delta.

W Li 1, J C Yu 1, P Michieli 1, J F Beeler 1, N Ellmore 1, M A Heidaran 1, J H Pierce 1
PMCID: PMC359203  PMID: 7935392

Abstract

The murine myeloid progenitor cell line 32D was recently shown to undergo monocytic differentiation when protein kinase C-delta (PKC-delta) was overexpressed and activated by 12-O-tetradecanoylphorbol-13-acetate (TPA) (H. Mischak, J.H. Pierce, J. Goodnight, M.G. Kazanietz, P.M. Blumberg, and J.F. Mushinski, J. Biol. Chem. 268:20110-20115, 1993). Tyrosine phosphorylation of PKC-delta occurred when PKC-delta-transfected 32D cells were stimulated by TPA (W. Li, H. Mischak, J.-C. Yu, L.-M. Wang, J.F. Mushinski, M.A. Heidaran, and J.H. Pierce, J. Biol. Chem. 269:2349-2352, 1994). In order to elucidate the role played by PKC-delta in response to activation of a receptor tyrosine kinase, we transfected platelet-derived growth factor beta receptor (PDGF-beta R) alone (32D/PDGF-beta R) or together with PKC-delta (32D/PDGF-beta R/PKC-delta) into 32D cells. NIH 3T3 cells which endogenously express both PDGF-alpha R and PDGF-beta R were also transfected with PKC-delta (NIH 3T3/PKC-delta). Like TPA treatment, PDGF-BB stimulation caused striking phosphorylation of PKC-delta in vivo and translocation of some PKC-delta from the cytosol fraction to the membrane fraction in both cell systems. Some of the phosphorylation induced by PDGF-BB treatment was found to be on a tyrosine residue(s). Tyrosine-phosphorylated PKC-delta was observed only for the membrane fraction after stimulation with PDGF-BB or TPA. The enzymatic activity of PKC-delta in the membrane fraction also increased after stimulation with TPA or PDGF, providing a positive correlation between PKC-delta tyrosine phosphorylation and its activation. Overnight treatment of 32D/PDGF-beta R/PKC-delta cells with PDGF-BB induced monocytic differentiation as judged by an increase in expression of cell surface macrophage differentiation markers. PDGF-BB had much weaker effects on 32D/PDGF-beta R cell differentiation, suggesting that increased PKC-delta expression enhanced monocytic differentiation. These results indicate that PKC-delta is a downstream molecule in the PDGFR signaling pathway and may play a pivotal role in PDGF-beta R-mediated cell differentiation.

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Selected References

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