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. 1992 Aug 11;20(15):3839–3844. doi: 10.1093/nar/20.15.3839

Effects of antioestrogens on the DNA binding activity of oestrogen receptors in vitro.

N D Arbuckle 1, S Dauvois 1, M G Parker 1
PMCID: PMC334056  PMID: 1508668

Abstract

We have investigated the effect of a series of steroidal oestrogen antagonists, related to ICI 164,384, on the DNA binding activity of mouse oestrogen receptors expressed in insect cells. The analogues possess different side chains at the 7-position of the B ring in the steroid. Inhibition was observed when the length of the side-chain was 15-16 carbon atoms but not 10 or 20 carbon atoms and only when the 7 alpha isomer was used. The DNA binding activity of receptors expressed in COS-1 cells was also inhibited after extended periods of incubation with antioestrogens but not that of the human receptor in breast cancer cell-extracts. We have proposed that ICI 164,384 might disrupt receptor dimerisation, and therefore the variation in its ability to inhibit DNA binding activity may reflect differences in dimer stability. Since the DNA binding activity of in vitro translated receptors was inhibited when they were translated in the presence of the antioestrogen we suggest that ICI 164,384 might prevent the formation of receptor dimers without necessarily being able to disrupt preformed dimers.

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