Adenylate Cyclase System in Fetal Rat Keratinizing Epidermal Cells (FRSK Cells) and SV40‐transformed Human Keratinocytes

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Abstract
The adenylate cyclase system of FRSK cells, a cultured cell line of fetal rat epidermal keratinocytes, and SV40‐transformed human keratinocytes was investigated. Stimulators of the human epidermal adenylate cyclase, epinephrine, adenosine, and prostaglandin E2 increased cyclic AMP levels of these cells. There were marked differences in the stimulatory effects; while epinephrine revealed a much stronger effect than the other stimulators in FRSK cells, epinephrine and prostaglandin E2 revealed similarly marked effects in SV40‐transformed cells. Histamine had little or only slight effect on the cyclic AMP levels of these cells. Cholera toxin and forskolin, which work on the stimulatory guanine nucleotide binding protein (Gs) and the catalytic component of adenylate cyclase, respectively, also increased cyclic AMP levels. Northern blot hybridization analysis revealed that both FRSK cells and SV40‐transformed human keratinocytes express mRNAs for the beta2‐adrenergic receptor, as well as the stimulatory and inhibitory guanine nucleotide binding proteins (Gs and Gi, respectively). The presence of Gs as well as Gi were confirmed by cholera toxin‐, and pertussis toxin (IAP)‐induced ADP‐ribosylation of membranous proteins of these cells. Our results indicate that both FRSK cells and SV40‐transformed human keratinocytes express the fundamental components of the adenylate cyclase system. These cell lines might be useful tools for the analysis of the adenylate cyclase system in epidermal keratinocytes.

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