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Characterization of calcium-dependent forms of protein kinase C in adult rat ventricular myocytes

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Abstract

The presence and subcellular localization of the Ca2+-dependent protein kinase C (PKC) isoforms α and β were investigated in freshly isolated adult rat cardiac ventricular myocytes. PKC activity was measured in cytosolic and particulate fractions prepared from control myocytes and those treated with either phorbol ester (phorbol 12-myristate 13-acetate, PMA) or a permeant synthetic diacylglycerol analog (1-oleoyl-2-acetylglycerol, OAG) in the absence or presence of an inhibitor of diacylglycerol kinase activity, compound R59022. Preliminary studies detected no Ca2+-/phospholipid-dependent histone kinase activity in either subcellular fraction. To reproducibly observe Ca2+-/phospholipid-dependent protein kinase activity, partial purification using a MonoQ HR 5/5 column and the presence of the peptide inhibitor of the cAMP-dependent protein kinase were essential. MonoQ chromatography of cytosolic and particulate fractions resulted in three peaks of Ca2+/phospholipid-dependent protein kinase activity. In the cytosolic fraction a large peak of activity eluted at 230-300 mM NaCl. Isoform-specific antisera indicated both PKCα and PKCβ were present. In the particulate fraction two peak of Ca2+-/phospholipid-dependent protein kinase activity, both containing PKCa immunoreactivity, were observed. The larger peak eluted at 230-300 mM NaCl. In addition, a peak eluting at lower salt concentrations contained a Ca2+-/phospholipid-independent histone kinase activity. This peak of kinase activity contained PKCα immunoreactive bands of 80- and 50-kDa. The 80-kDa band was the holoenzyme of PKCα whereas the band of lower molecular mass was likely a proteolytic fragment. In both cytosolic and particulate fractions, the peak of kinase activity eluting at 230-300 mM NaCl contained PKCα in the form of an 80-kDa doublet; this suggested the presence of autophosphorylated PKC. Incubation of the myocytes with PMA, but not OAG, resulted in translocation of PKC from the cytosolic to the particulate fraction. Curiously, a transient decrease in PKC activity was observed in both subcellular fractions following treatment with either OAG or ethanol (1%). Results from this study show that freshly isolated adult rat cardiac ventricular myocytes contain both PKCα and PKCβ, and that these isoforms translocate to the particulate fraction in response to treatment with PMA, but not OAG. (Mol Cell Biochem 166: 11-23, 1997)

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  1. Division of Pharmacology and Toxicology, Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, British Columbia, V6T 1Z3, Canada

    Monika Wientzek, Bruce G. Allen, Gaye McDonald-Jones & Sidney Katz

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  1. Monika Wientzek
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Wientzek, M., Allen, B.G., McDonald-Jones, G. et al. Characterization of calcium-dependent forms of protein kinase C in adult rat ventricular myocytes. Mol Cell Biochem 166, 11–23 (1997). https://doi.org/10.1023/A:1006861011857

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