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Oncology and Molecular Endocrinology Research Center, Centre de Recherche du Centre Hospitalier de l’Université Laval (CRCHUL), 2705, Laurier Boulevard, Québec, Québec GIV 4G2, Canada

(Requests for offprints should be addressed to Georges Pelletier; Email: georges.pelletier{at}crchul.ulaval.ca)

The enzyme 17ß-hydroxysteroid dehydrogenase (17ß-HSD) type 1 catalyzes the conversion of estrone (E₁) into 17ß estradiol (E₂). To gain information about the cellular localization of 17ß-HSD mRNA type 1 expression, we performed in situ hybridization using a ³⁵S-labeled cRNA probe in several tissues of adult mice of both sexes. In the ovary, high expression was found in granulosa cells of growing follicles. No specific labeling could be observed in corpora lutea or interstitial cells. In the pituitary gland of animals of both sexes, 17ß-HSD type 1 mRNA was expressed in the intermediate lobe melanotrophs while no specific signal could be detected in the anterior or posterior lobes of the pituitary. In the prostate, 17ß-HSD type 1 mRNA was exclusively found in the epithelial cells. In both male and female mouse dorsal skin, a specific hybridization signal was seen in the sebaceous glands while the epidermis, stroma, hair follicles and sweat glands were unlabeled. In the testis, a hybridization signal was detected in germ cells of the seminiferous tubules, Leydig cells being unlabeled. The present data indicate that E₂ can be formed through the action of 17ß-HSD type 1 in specific cells of the gonads and peripheral tissues. In the testes and peripheral tissues, the action of E₂ is probably limited to the cells involved in its formation in an intracrine fashion.

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