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J. Biol. Chem., Vol. 269, Issue 26, 17495-17501, Jul, 1994
S Ohno, K Mizuno, Y Adachi, A Hata, Y Akita, K Akimoto, S Osada, S Hirai and K Suzuki
Rat fibroblast 3Y1 cells express at least three protein kinase C species,
conventional PKC alpha (cPKC alpha), novel PKC delta (nPKC delta), and
novel PKC epsilon (nPKC epsilon). The stimulation of quiescent 3Y1 cells by
serum (or epidermal growth factor (EGF) but not
12-O-tetradecanoylphorbol-13-acetate (TPA) results in the induction of DNA
synthesis. Upon stimulation by serum or EGF, endogenous PKC species showed
no indication of activation such as translocation or down- regulation,
whereas TPA or synthetic diacylglycerol caused activation of all these PKC
species when judged by these criteria. The only indication of activation
observed upon serum or EGF stimulation was an upward shift in the
electrophoretic mobility of nPKC delta. The phosphorylation levels of
endogenous PKC members determined by in vivo metabolic labeling experiments
revealed increased phosphorylation of both nPKC delta and nPKC epsilon, but
only a slight increase for cPKC alpha in response to serum or EGF. On the
other hand, TPA caused increased phosphorylation of all three PKC species.
Overexpression of these PKC members by introduction of the corresponding
cDNA expression plasmids resulted in the enhancement of the cell response
to TPA when monitored in terms of transcriptional activation through TPA-
or serum- responsive elements. Such enhancement in transcriptional
activation by overexpression of cPKC alpha, nPKC delta, or nPKC epsilon was
also observed in response to diacylglycerol, indicating that all these PKC
species are activated by diacylglycerol in cells. In contrast to these
nonphysiological stimuli, serum (or EGF) stimulation of 3Y1 cells that
overexpress the respective PKC members revealed a clear difference between
cPKC and nPKC, in that overexpression of nPKC delta or nPKC epsilon
resulted in a large increase in TPA- or serum-responsive element
activation, whereas the overexpression of cPKC alpha increased activation
only very slightly. These results indicate that the mitogenic stimulation
of quiescent 3Y1 cells results in selective activation of endogenous nPKC
members and that the modes of activation of cPKC and nPKC differ from each
other.
Activation of novel protein kinases C delta and C epsilon upon mitogenic stimulation of quiescent rat 3Y1 fibroblasts
Department of Molecular Biology, Yokohama City University School of Medicine, Japan.
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