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. 1984 Apr;3(4):751–755. doi: 10.1002/j.1460-2075.1984.tb01879.x

DNA binding properties of glucocorticosteroid receptors bound to the steroid antagonist RU-486.

S Bourgeois, M Pfahl, E E Baulieu
PMCID: PMC557421  PMID: 6327286

Abstract

RU-486 is an anti-fertility steroid which also has anti-glucocorticosteroid effects. RU-486 is shown to be a strong antagonist of the glucocorticosteroid-induced cytolytic response of the murine thymoma lines W7TB and T1M1b , and of the induction of mouse mammary tumor virus (MMTV) mRNA in T1M1b cells. The glucocorticosteroid receptor of W7 cells has high affinity for RU-486 (Kd = 3 X 10(-9) M) but the complex formed has low nuclear transfer capacity. Binding of RU-486, as compared with the glucocorticosteroid agonist triamcinolone acetonide, to mouse receptor results in a decreased affinity for DNA in general and a reduced specific recognition of a site in the promoter region of MMTV proviral DNA. The RU-486 complex formed with rat liver receptor exhibits the same behavior; in addition, it is shown that only a fraction of these complexes are activated by temperature and these form highly salt-sensitive interactions with DNA. These results indicate that the binding of RU-486 to glucocorticosteroid receptors mimics pharmacologically the properties of a class of receptor variants (nt-) which are non-functional and have reduced nuclear transfer and altered DNA binding capacity. These results substantiate the importance of DNA binding in receptor function.

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Selected References

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