Kloosterboer HJ, Deckers GH, van der Heuvel MJ, Loozen HJ. Screening of anti-progestagens by receptor studies and bioassays.
JOURNAL OF STEROID BIOCHEMISTRY 1988;
31:567-71. [PMID:
3199806 DOI:
10.1016/0022-4731(88)90007-6]
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Abstract
A large number of potential anti-progestational compounds were screened for their ability to bind to the progesterone (MCF-7 cells) and glucocorticoid (IM-9 cells) receptors and for their activity in the pregnancy interruption test in rats. The anti-glucocorticoid activity was assessed by the effect of the compounds on body weight gain, adrenal weight and thymus weight in dexamethasone-treated rats. Of the compounds tested, two (Org 31167 and Org 31343) with the dimethylaminophenyl group at carbon atom 18 of 17 beta-hydroxy-17 alpha-(2-propenyl)-estra-4-en-3-one are equipotent with RU 38486 in the pregnancy interruption test. Both compounds possess lower anti-glucocorticoid activity than RU 38486. Since these compounds are far more active after oral than subcutaneous administration it is very likely that they become activated in the gastro-intestinal tract.
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