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A cell population highly enriched in human epidermal basal cells has been obtained and characterized by using antibodies specific for various cell types in the epidermis. Quantitative two-dimensional gel electrophoretic analysis (isoelectric focusing) of [35S]methionine-labeled polypeptides from basal cells and simian virus 40-transformed keratinocytes showed that the basal cells synthesize very low amounts (less than 0.02% of the total protein) of the nuclear, transformation-sensitive protein cyclin as compared to the transformed cells, which synthesize this protein constitutively (0.15% of the total protein). Very low levels of cyclin were observed in total human epidermis, and preliminary studies of two basaliomas have shown a significant synthesis of this protein in these tumors. Immunofluorescence studies using antibodies to proliferating cell nuclear antigen that immunoprecipitate cyclin confirmed the above observations at least in the case of the cultured cells. Taken together, these results support the notion that cyclin may be a central component of the pathway(s) that controls cell proliferation.

Expression of the transformation-sensitive protein "cyclin" in normal human epidermal basal cells and simian virus 40-transformed keratinocytes.