Abstract
Dose–response curves for lordosis and proceptive behaviors were obtained for luteinizing hormone releasing hormone (LHRH), prostaglandin E 2 (PGE 2) and dibutyryl cyclic AMP (db-cAMP), by infusing them in the right lateral ventricle (icv) of ovariectomized (OVX) estradiol benzoate (E 2B; 2 μg) treated rats. Two dose levels, one producing the maximal effect and the other one producing a submaximal response (∼ ED50) were selected for testing the capacity of Rp-cAMPS, a kinase A blocker, to modify the behavioral response to the three compounds. Icv injections of Rp-cAMPS, significantly depressed both lordosis and proceptive responses induced by LHRH, PGE 2 and db-cAMP. The results show that these agents use the cAMP-kinase A signaling pathway to elicit their stimulating effect on estrous behavior in the rat.
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