PMID: 2432356Nov 1, 1986Paper

Competitive binding assay for estrogen receptor in monolayer culture: measure of receptor activation potency

Journal of Steroid Biochemistry
S Stoessel, G Leclercq


MCF-7 cells were incubated with [3H]estradiol, unlabeled estradiol and various estrogens or antiestrogens to measure their relative binding affinity (whole-cell assay). Comparison of the values with those previously established on uterine cytosol with a DCC assay revealed a good parallelism for both steroid and diphenolic diethylstilbestrol based estrogens. On the contrary, in the whole-cell assay, antiestrogens and weak estrogens of the triphenyl- and gem-diphenylethylene categories always displayed low values which were in the order of magnitude found with weak steroid estrogens. This property was not due to a reduction of binding capacity, nor to the presence in some compounds of an ethoxyaminoalkyl side-chain (source of antiestrogenicity). In view of all these data, it was concluded that the present test would provide an estimate of the ability of a given compound to transform the receptor in a form which interacts with genomic sites involved in the regulation of "estrogenic-induced products" ("activation").


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Oct 1, 1988·Journal of Steroid Biochemistry·R McCagueS Stoessel
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