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Mol Cell Biol. 1994 October; 14(10): 6727-6735

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

W Li, J C Yu, P Michieli, J F Beeler, N Ellmore, M A Heidaran and J H Pierce

Laboratory of Cellular and Molecular Biology, National Cancer Institute, Bethesda, Maryland 20892.

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.


Mol Cell Biol. 1994 October; 14(10): 6727-6735




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