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Ovariectomized ewes were given a single injection (i.v.) of 100 micrograms oestradiol-17 beta. Nuclear oestrogen receptor values in the pituitary, as a function of total receptor concentrations, were 3.0 +/- 1.0% in controls, 56.0 +/- 5.4% at 1 h (P less than 0.001) and 6.5 +/- 2.1% at 6 h (P less than 0.05) after oestradiol injection. There was a fall in plasma LH values from 5.7 +/- 1.0 (preinjection) to 2.1 +/- 0.3 ng/ml (P less than 0.01) 4-6 h after oestradiol. At 13-21 h after injection plasma levels increased to 37 +/- 8 ng/ml (P less than 0.001). Plasma FSH levels declined from 840 +/- 18 to 506 +/- 48 ng/ml after 20-22 h (P less than 0.001). Plasma prolactin concentrations fell from 90 +/- 16 ng/ml before injection to 29 +/- 9 ng/ml at 1 h (P less than 0.05), and then rose to a maximum of nuclear compartmentalization of oestrogen receptors after a bolus injection of oestradiol was associated with the feedback effects of oestradiol on LH, FSH and prolactin release.

Relationship between pituitary nuclear oestrogen receptors and the release of LH, FSH and prolactin in the ewe