Origin and Quantification of Cytoplasmic Estradiol Receptor in Resting Target Cells

Abstract
The exhaustive extraction of microsomal estradiol receptor by surfynol/dithiothreitol/trypsin in low ionic strength buffer was employed for distribution studies on non-stimulated porcine endometrium. More than 1/2 of the cytoplasmic receptor contents were of microsomal orgin. Empty structures did not interfere with receptor analysis by agar-gel electrophoresis. The combined yields from homogenate-fractions corresponded to those obtained from unfractionated homogenates. Freeze-fracturing of endometrium had a moderate receptor-solubilizing effect.

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