Oestrogen receptor-like binding in the surface germinal epithelium of the rat ovary

Abstract
The surface germinal epithelium of the rat ovary was isolated and grown in vitro. Cytosol from cultured cells contained a saturable component, of sedimentation coefficient 7·5–8·5S, which bound oestrogenic and antioestrogenic substances with high affinity (Kd 400 pmol/l). Nuclei isolated from cells exposed to [3H]oestradiol contained radioactivity partially susceptible to KC1 extraction. Sedimentation analysis of the KC1 extract showed that [3H]oestradiol was associated with a moiety of sedimentation coefficient 4·5–5S.