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The differential expression of protein kinase C genes in normal human neonatal melanocytes and metastatic melanomas
Clinical Cancer Center and Department of Medicine, University of California Irvine, CA 92717, USA
1To whom correspondence should be addressed at: UC Irvine Clinical Cancer Center, 101 City Drive, Orange, CA 92668, USA
Expression of protein kinase C (PKC) genes (
, ß, 
and 
) was measured in cultured normal human neonatal melanocytes and metastatic melanoma cell strains. Three of the PKC isotypes (, ß and ) were constitutively expressed in neonatal melanocytes. Protein kinase C ß RNA transcripts were induced in neonatal melanocytes cultivated in medium with serum and 12-O-tetradecanoylphorbol-13-acetate (TPA). In contrast, PKC and RNA transcripts were detected in melanocytes cultivated in medium without serum and TPA, but were repressed in melanocytes cultivated in medium with serum and TPA. Only PKC and RNA transcripts were detected in the melanoma cell strains and the PKC RNA transcript expression levels varied among the five metastatic melanomas. In four metastatic melanoma cell strains, PKC and RNA transcript expression levels were repressed by serum, but in one melanoma cell strain, PKC and RNA transcript expression levels were induced by serum. Protein kinase C RNA transcripts were not detected in either the melanocytes or melanoma cell strains. These data suggest an alteration of PKC isotype gene expression in the progression of primary melanocytes to metastatic melanoma. The absence of the PKC ß RNA transcripts and altered expression of PKC and isotypes in particular may be a feature in the transformation of human primary melanocytes.
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