Abstract
Retinoids profoundly affect the normal growth and differentiation of epithelial tissues. Retinoic acid receptor-gamma (RAR-gamma) is a member of a family of retinoid receptors, and has been shown to be expressed almost exclusively in skin. However, little is known about the cellular localization of this receptor in human skin. The authors studied the expression of RAR-gamma in normal skin and human skin tumors by Northern blot analysis and in situ hybridization. RAR-gamma mRNA was detected in normal skin as well as in cultures of neonatal keratinocytes. Using an oligonucleotide specific for the RAR-gamma cDNA isoform 1 (RAR-gamma 1), RAR-gamma 1 mRNA was localized to all layers of the epidermis, the outer root sheath of hair follicles, follicular hair bulbs, eccrine and sebaceous glands. Basal cell carcinoma constitutively expressed gamma-1 mRNA and one of seven squamous cell carcinomas showed loss of gamma-1 mRNA expression, relative to adjacent epithelium. By contrast, normal melanocytic nevi and tumor-associated lymphocytes expressed little or no RAR-gamma mRNA. These results suggest that RAR-gamma 1 may play an important role in the maintenance and differentiation of normal epidermis and skin appendages.
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