Effects of the antiestrogens,MER-25 and CI 628, on rat and hamster lordosis |
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Authors: | LP Morin JBradley Powers Mary White |
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Institution: | 1. Psychology Department, University of California, Berkeley, California 94720, U.S.A.;2. Neuroscience Laboratory, University of Michigan, Ann Arbor, Michigan 48104 U.S.A. |
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Abstract: | Antiestrogens were used to test the hypothesis that estrogen exerts a “maintenance,” as well as a “priming,” effect on rat and hamster sexual receptivity as it apparently does for guinea pigs. MER-25 (75 or 150 mg/kg) significantly reduced rat LQ when given ?2 hr or 8 hr after EB injection. MER-25 given at 34 hr (2 hr prior to P) failed to diminish rat LQ. With hamsters, MER-25 in large doses (750 mg/kg) given either at ?2 hr or 34 hr reduced lordosis duration to 40% of controls, but this effect was confounded by severe illness among the MER-25 injected animals. Lower doses failed to block behavior, but still produced some toxicity. CI 628 (50 mg/kg) greatly reduced hamster lordosis duration and increased lordosis latency when given 0 hr, but not 34 hr, after EB. The results are consistent with similar previous work on rats and do not support the concept of estrogen “maintenance” in either rats or hamsters. |
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