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: complex roles in cell proliferation and survival
Department of Biological Sciences, Hunter College of The City University of New York, New York, New York, USA
1Correspondence: Department of Biological Sciences, Hunter College of The City University of New York, 695 Park Ave., New York, NY 10021, USA. E-mail: foster{at}genectr.hunter.cuny.edu
Protein kinase C
(PKC
) has been implicated both as a tumor suppressor and a positive regulator of cell cycle progression. PKC
has also been reported to positively and negatively regulate apoptotic programs. This has led to conflicting hypotheses on the role of PKC
in the control of cell proliferation and survival. Surprisingly, PKC
mice develop normally and are fertile, indicating that PKC
is not critical for normal cell proliferation during development. However, PKC
may play important roles in neoplastic cell proliferation. In this review, we have summarized the apparent multifunctional properties of this enigmatic protein with regard to its role in the regulation of cell cycle progression and cell survival. It is proposed that PKC
has both tumor suppressor and proliferation capabilities that can be recruited as a backup kinase for both gatekeeper tumor suppression and as an activator of the Ras/Raf/MEK/MAP kinase signaling pathway in cell proliferation.Jackson, D. N., Foster, D. A. The enigmatic protein kinase C
: complex roles in cell proliferation and survival.
Key Words: cell cycle tumor promotion tumor suppressor tyrosine kinase
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