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  • Title: Proteolytic activation of protein kinase C in the extracts of cells treated for a short time with phorbol ester.
    Author: Buday L, Seprödi J, Farkas G, Mészáros G, Romhányi T, Bánhegyi G, Mandl J, Antoni F, Faragó A.
    Journal: FEBS Lett; 1987 Oct 19; 223(1):15-9. PubMed ID: 3666136.
    Abstract:
    A 10 min treatment of human neutrophils with phorbol 12-myristate 13-acetate (PMA) has been reported to induce accumulation of the proteolytically activated Ca2+/phospholipid-independent catalytic fragment of protein kinase C in the cytosol of intact cells [(1986) J. Biol. Chem. 261, 4101-4105]. We investigated the proteolytic conversion of protein kinase C to Ca2+/phospholipid-independent form in the cytosol and membrane fractions of pig neutrophils. The activity of protein kinase C was measured with its specific oligopeptide substrate Ala-Ala-Ala-Ser-Phe-Lys-Ala-Lys-Lys-amide designed previously. In our experiments the short-term treatment of neutrophils with PMA did not induce the accumulation of the proteolytically activated form of protein kinase C in the cytosol of intact cells. However, treatment of cells with PMA enhanced the limited proteolysis of protein kinase C during the preparation of cell extracts.
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