Protein kinase C (PKC) and mitogen-activated protein (MAP) kinase are protein-serine/threonine kinases which are important regulators of diverse cellular processes including metabolism, proliferation and differentiation. This study shows that both hypoxia and X irradiation of serum-deprived Chinese hamster V79 cells cause the induction and phosphorylation of the PKC-α isoform. The increased induction and phosphorylation of PKC occur mainly in the nuclear fraction. Unlike the PKC activator TPA, neither hypoxic nor radiation stress causes translocation of PKC-α from the cytosol to the membrane. The induction of PKC-α by hypoxia is accompanied by an increased expression of MAP kinase but, in contrast, this does not occur when PKC-α is induced by radiation. Radiation, like TPA, causes a complete redistribution of MAP kinase from the cytosol to the nucleus.
Induction and Phosphorylation of Protein Kinase C-α and Mitogen-Activated Protein Kinase by Hypoxia and by Radiation in Chinese Hamster V79 Cells
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Na'il M. Hasan, Peter J. Parker, Gerald E. Adams; Induction and Phosphorylation of Protein Kinase C-α and Mitogen-Activated Protein Kinase by Hypoxia and by Radiation in Chinese Hamster V79 Cells. Radiat Res 1 February 1996; 145 (2): 128–133. doi: https://doi.org/10.2307/3579166
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