WAY100635 and female rat lordosis behavior.
Sexually receptive proestrous rats with bilateral cannulae in the ventromedial nucleus of the hypothalamus (VMN) were infused with 200 ng of (+/-)-8-hydroxy-2-(di-n-propylamino) tetralin (8-OH-DPAT) or with 8-OH-DPAT plus varying concentrations (200 to 2000 ng) of the 5-HT1A receptor antagonist, N-[2[4-(2-methoxyphenyl)-1-piperazinyl]ethyl]N-(2-pyridinyl)cyclohexanecarboxamide trihydrochloride (WAY100635). 8-OH-DPAT inhibited lordosis behavior within 15 min of the infusion and every dose of WAY100635 prevented the inhibition. When non-sexually receptive, ovariectomized rats, hormonally primed with 0.5 microg estradiol benzoate and 500 microg progesterone, were infused with WAY100635 (400 to 2000 ng), the 5-HT1A receptor antagonist did not facilitate lordosis responding. These findings support earlier findings that activation of 5-HT1A receptors in the mediobasal hypothalamus inhibits lordosis behavior. However, they further demonstrate that tonic activation of 5-HT1A receptors is not responsible for the absence of sexual receptivity in suboptimally hormonally primed ovariectomized rats.
Uphouse
Lynda
L
Department of Biology, Texas Woman's University, Denton, TX 76204, USA. LUphouse@twu.edu
Wolf
Amy
A
D017371:8-Hydroxy-2-(di-n-propylamino)tetralin / Q000494:pharmacology; D000818:Animals; D005260:Female; D010052:Ovariectomy; D010879:Piperazines / Q000494:pharmacology*; D011187:Posture; D011359:Proestrus / Q000502:physiology; D011725:Pyridines / Q000494:pharmacology*; D051381:Rats; D011916:Rats, Inbred F344; D012702:Serotonin Antagonists / Q000494:pharmacology*; D017366:Serotonin Receptor Agonists / Q000494:pharmacology; D012726:Sexual Behavior, Animal / Q000187:drug effects*; D014697:Ventromedial Hypothalamic Nucleus / Q000187:drug effects* / Q000502:physiology
D010879:Piperazines; D011725:Pyridines; D012702:Serotonin Antagonists; D017366:Serotonin Receptor Agonists; C090413:N-(2-(4-(2-methoxyphenyl)-1-piperazinyl)ethyl)-N-(2-pyridinyl)cyclohexanecarboxamide; D017371:8-Hydroxy-2-(di-n-propylamino)tetralin