Abstract
Estrogens are known to induce tumors in several animal species. To understand the mechanism of hormonal carcinogenesis, estrogen-induced renal carcinoma in male Syrian hamsters was investigated using estradiol and 2-fluoroestradiol. The biological activities of the latter steroid were compared with those of the natural hormone, because of the reduced metabolic conversion of 2-fluoroestradiol to catechol estrogen metabolites. 2-Fluoroestradiol was administered to male Syrian hamsters at three times the dose (60 mg) of estradiol (20 mg, positive control) by s.c. implantation. After 7 months, 75% of the estradiol-treated hamsters had kidney tumors, while in animals exposed to 2-fluoroestradiol renal carcinoma could not be detected. The reduced tumor incidence by the fluorinated steroid is not due to a lack of estrogenic potency. In the test animals, pituitary LH concentrations matched those measured in estradiol-treated hamsters and the reduction in testes weights was comparable. Furthermore, in immature female rats, uterine wet weight increases illustrate that 2-fluoroestradiol is a potent estrogen. The observed increases in uterine weight were shown to be accompanied by increases in protein and DNA synthesis comparable to those ...Continue Reading
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