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We have investigated the effect of blocking -MSH on the release of LH in rats at pro-oestrus. Continuous infusion of Pro-Leu-Gly-NH₂ (PLG; 0·2 µg/h), from the afternoon of dioestrus-2 until the day of oestrus, inhibited LH at pro-oestrus and the next ovulation on the day of oestrus. Plasma -MSH levels decreased significantly in rats treated with PLG. This inhibitory effect on LH release was not observed in rats treated with a continuous infusion of a diluted antiserum against -MSH (0·5 µl/h, diluted 1/10) from the afternoon of dioestrus-2 until the day of oestrus. On the contrary, the administration of undiluted antiserum against -MSH (0·5 µl/h) blocked LH release and ovulation. The release of -MSH into the blood was also significantly blocked by this treatment.

When serum levels of progesterone were measured at 12.00 and 14.00 h in rats in which -MSH release was blocked by PLG or concentrated antiserum, a significant decrease was observed when compared with the levels of progesterone in control rats. These results show that the blockade of -MSH inhibits LH release and the next ovulation in rats treated with PLG or with concentrated antiserum against -MSH, through a blockade of progesterone of adrenal origin.

Journal of Endocrinology (1993) 137, 197–202

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