title: 17-beta-hydroxysteroid dehydrogenase in human breast and endometrial carcinoma. A new development in intracrinology.
abstract: Intratumoral metabolism and synthesis of estrogens are considered to play very important roles in the pathogenesis and development of various sex steroid-dependent neoplasms including breast and endometrial carcinoma. 17 beta-Hydroxysteroid dehydrogenase (17 beta-HSD) isozymes catalyze the interconversion of estradiol (E(2)) and estrone (E(1)), and thereby serve to modulate the tissue levels of bioactive E(2). 17 beta-HSD type 1 primarily catalyzes the reduction of E(1) to E(2), whereas 17 beta-HSD type 2 primarily catalyzes the oxidation of E(2) to E(1). In the human breast and its disorders, 17 beta-HSD type 1 is expressed in proliferative diseases without atypia, atypical ductal hyperplasia, ductal carcinoma in situ and invasive ductal carcinoma. 17 beta-HSD type 2 is not detected in any of the lesions. In addition, 17 beta-HSD type 1 coexpression is significantly correlated with estrogen receptor status in invasive ductal carcinoma cases. These results indicate that breast carcinoma can effectively convert E(1), produced as a result of in situ aromatization, to E(2), a biologically potent estrogen, and exerts estrogenic actions on tumor cells through the estrogen receptor. On the other hand, in the human endometrium, 17 beta-HSD type 2 is expressed, but not 17 beta-HSD type 1. 17 beta-HSD type 2 is expressed in the secretory phase but not in any proliferative phase in the endometrial mucosa. The enzyme is expressed in 75% of endometrial hyperplasias and 37% of carcinoma cases. In endometrial carcinoma cases, a significant inverse correlation has been detected between 17 beta-HSD type 2 immunoreactivity and age (p < 0.02). These results indicate that oxidation of E(2) to E(1) is dominant in endometrial carcinoma, 17 beta-HSD types 1 and 2 play an important role in the regulation of in situ estrogen production in breast and endometrial carcinoma.
authors.affiliation: Department of Pathology, Tohoku University School of Medicine, Sendai, Japan. hsasano@patholo2.med.tohoku.ac.jp
authors.forename: H
authors.initials: H
authors.lastname: Sasano
authors.forename: T
authors.initials: T
authors.lastname: Suzuki
authors.forename: J
authors.initials: J
authors.lastname: Takeyama
authors.forename: H
authors.initials: H
authors.lastname: Utsunomiya
authors.forename: K
authors.initials: K
authors.lastname: Ito
authors.forename: N
authors.initials: N
authors.lastname: Ariga
authors.forename: T
authors.initials: T
authors.lastname: Moriya
mesh_terms: D015152:Blotting, Northern; D001943:Breast Neoplasms / Q000188:drug therapy* / Q000473:pathology; D016889:Endometrial Neoplasms / Q000188:drug therapy* / Q000473:pathology; D004960:Estradiol Dehydrogenases / Q000627:therapeutic use*; D005260:Female; D006801:Humans; D007150:Immunohistochemistry
chemical_list: D004960:Estradiol Dehydrogenases