Dose-dependent effects of estradiol benzoate on 5-HT1A receptor agonist action.
The lordosis-inhibiting effects of the 5-HT1A receptor agonist, (+/-)8-hydroxy-2-(di-n-propylamino) tetralin (8-OH-DPAT), were examined in ovariectomized rats, hormone primed with 2.5, 7.5, or 25 micrograms estradiol benzoate plus 500 micrograms progesterone. 8-OH-DPAT (50, 100 or 200 ng per bilateral site) infused into the ventromedial nucleus of the hypothalamus (VMN), inhibited lordosis behavior in all hormone-treated conditions. However, animals primed with 2.5 micrograms estradiol benzoate were significantly more affected by the infusion than rats primed with 7.5 or 25 micrograms of the hormone. These findings strengthen prior speculations that 5-HT1A receptor function is modulated by estrogen.
Department of Biology, Texas Woman's University, Denton 76204, USA.
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Jackson
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Uphouse
D017371:8-Hydroxy-2-(di-n-propylamino)tetralin / Q000494:pharmacology; D000818:Animals; D004305:Dose-Response Relationship, Drug; D004958:Estradiol / Q000494:pharmacology*; D005260:Female; D010052:Ovariectomy; D051381:Rats; D011916:Rats, Inbred F344; D017366:Serotonin Receptor Agonists / Q000494:pharmacology*; D012726:Sexual Behavior, Animal / Q000187:drug effects*; D014697:Ventromedial Hypothalamic Nucleus / Q000502:physiology
D017366:Serotonin Receptor Agonists; D004958:Estradiol; D017371:8-Hydroxy-2-(di-n-propylamino)tetralin