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.

journal_name

Oncology

journal_title

Oncology

authors

Sasano H,Suzuki T,Takeyama J,Utsunomiya H,Ito K,Ariga N,Moriya T

doi

10.1159/000055281

subject

Has Abstract

pub_date

2000-01-01 00:00:00

pages

5-12

eissn

0030-2414

issn

1423-0232

pii

55281

journal_volume

59 Suppl 1

pub_type

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