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Effects of. gamma. irradiation on plasma testosterone levels and hepatic drug metabolism in the rat. [Dimethylation of aminopyrine]

Journal Article · · Radiat. Res.; (United States)
DOI:https://doi.org/10.2307/3575033· OSTI ID:5557467

When adult male Sprague-Dawley rats were exposed to whole-body irradiation of ..gamma.. rays ranging from 700 to 1000 rad, oxidative demethylation of drugs such as aminopyrine was significantly reduced. In agreement with the report of McTaggart and Wills, we have independently found that this irradiation-induced inhibition of hepatic drug metabolism was a result of blockage of testosterone synthesis or release. The plasma hormone levels in the treated animals (900 rad of ..gamma.. rays) declined gradually from a normal value of 5.5 +- 0.5 ng/ml to a minimum value of 0.9 +- 0.4 ng/ml, which was reached in 4 to 6 days after the irradiaton. It returned to normal level after the 10th day. This hormonal change caused by ..gamma.. irradiation was parallel with the change in aminopyrine demethylation, thus suggesting that impairment of hepatic drug metabolism by ..gamma.. rays was mainly secondary to the effect on the synthesis and/or release of the male sex hormone.

Research Organization:
Mahidol Univ., Bangkok, Thailand
OSTI ID:
5557467
Journal Information:
Radiat. Res.; (United States), Journal Name: Radiat. Res.; (United States) Vol. 19:1; ISSN RAREA
Country of Publication:
United States
Language:
English

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