Effect of single-dose progesterone administration on estradiol receptor levels in normal human endometrium

The effects of single-dose progesterone administration on cytosolic and nuclear estradiol receptor levels (RCE2, RNE2) in normal human endometrium were studied in a group of 17 women and the results compared to 18 controls. In both groups, RCE2 and RNE2 levels were highest in the mid-cycle phase and lowest in the secretory phase. Although a wide range of values was found in both groups, the levels of RCE2 in the two groups did not differ significantly. It seems that in human endometrium a single progesterone injection does not significantly change RCE2 and RNE2 levels.