Differential Effects of Prostaglandins on Lordosis Behavior in Female Guinea Pigs and Rats

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Abstract
The effect of in vivo injections of human luteinizing hormone (hLH), human follicle stimulating hormone (hFSH) and ethanol on gonadotropin receptor sites in rat testes was studied. We found that hLH (32 IU) and hFSH (30 IU) reduced the number of their respective binding sites shortly after administration. The hLH was more rapid and effective in its action than hFSH. Hormone specificity was also evident in the depletion process. The hLH could not effectively deplete testicular hFSH receptors during the first 3 days and vice versa.