title: Differential effects of progesterone and genital stimulation on sequential inhibition of estrous behavior and progesterone receptor expression in the rat brain.
abstract: The effect of genital stimulation, either by vaginocervical stimulation (VCS) using a calibrated vaginal probe combined with manual flank stimulation (FS), or by mounts performed by the male, on the hypothalamus and preoptic area concentration of the progesterone receptors A (PR-A) and B (PR-B) was assessed in ovariectomized (ovx) estrogen-primed rats. VCS/FS or stimulation provided by male mounts, even without intromission, significantly decreased PR-B concentration in the hypoythalamus. Down regulation of PR produced by genital stimulation was quantitatively similar to that elicited by progesterone (P) administration. Bilateral or unilateral transection of the pelvic or the pudendal nerves prevented down regulation elicited by VCS/FS. Repeated VCS/FS elicited lordosis behavior in most ovx estrogen primed rats, but the lordosis intensity was lower than that observed in response to P. P administered to ovx estrogen primed rats, induced sequential inhibition, i.e., failure to display estrous behavior in response to a second P injection (24h after the initial P injection). VCS/FS failed to elicit sequential inhibition, since rats responded with normal estrous behavior to the second injection of P. This suggests that down regulation by VCS, by contrast with P, failed to inhibit the subpopulation of PR involved in the facilitation of estrous behavior by P.
authors.affiliation: Centro de Investigación en Reproducción Animal, Universidad Autónoma de Tlaxcala-CINVESTAV, Plaza Hidalgo S/N, Panotla, Tlaxcala CP, 90140, México.
authors.forename: Madaí A
authors.initials: MA
authors.lastname: Gómez-Camarillo
authors.forename: Carlos
authors.initials: C
authors.lastname: Beyer
authors.forename: Rosa Angélica
authors.initials: RA
authors.lastname: Lucio
authors.forename: Marcos
authors.initials: M
authors.lastname: García-Juárez
authors.forename: Aliesha
authors.initials: A
authors.lastname: González-Arenas
authors.forename: Ignacio
authors.initials: I
authors.lastname: Camacho-Arroyo
authors.forename: Barry R
authors.initials: BR
authors.lastname: Komisaruk
authors.forename: Oscar
authors.initials: O
authors.lastname: González-Flores
mesh_terms: D000818:Animals; D001921:Brain / Q000033:anatomy & histology / Q000187:drug effects / Q000378:metabolism*; D004305:Dose-Response Relationship, Drug; D004971:Estrus / Q000187:drug effects*; D005260:Female; D008297:Male; D010052:Ovariectomy; D010812:Physical Stimulation / Q000379:methods; D011374:Progesterone / Q000494:pharmacology*; D051381:Rats; D017207:Rats, Sprague-Dawley; D011980:Receptors, Progesterone / Q000378:metabolism*; D012726:Sexual Behavior, Animal / Q000187:drug effects / Q000502:physiology; D018709:Statistics, Nonparametric; D013997:Time Factors; D014621:Vagina / Q000187:drug effects / Q000294:innervation*
chemical_list: D011980:Receptors, Progesterone; D011374:Progesterone