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Human epidermal keratinocytes, immortalized by the introduction of SV40-adenovirus recombinants (9), were maintained in a low calcium (0.15 mM) defined medium. When differentiation was induced by a higher extracellular calcium concentration (1.5 mM), these cells altered in shape and developed stratification with formation of desmosomes, while they demonstrated limited terminal keratinization. The expression of involucrin, one of the precursor proteins of the cornified envelope, became elevated as the cell density increased, but was not affected by calcium. These results indicate that the SV40 immortalized human keratinocytes, maintained in a low calcium defined medium, partially respond to changes in extracellular calcium concentration.
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