We analyzed the expression of five protein kinase C (PKC) isoforms in cytosolic and membrane fractions from normal rat hepatocytes compared with those of two tumorigenic cell lines FAO and HepG2. Western blots with PKC-specific isoenzymes polyclonal antibodies provide evidences for the presence of the five isoforms alpha, beta II, delta, epsilon and zeta in normal rat hepatocytes. In hepatoma cells, we show differences in the level of expression, the molecular sizes and the responses to Phorbol 12-myristate 13-acetate (PMA).
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