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• W1998451903 endingPage "207" @default.
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• W1998451903 abstract "Previously, we found that single implants of estradiol (E2) placed in the ventromedial hypothalamus (VMH) but not the anterior hypothalamus (AH) facilitated precopulatory, i.e. vaginal scent marking, and copulatory, i.e. lordosis, behavior following progesterone administration. However, the duration of lordosis was markedly attenuated in comparison to the duration shown by intact cycling females. This study was designed to examine whether dual implantation of E2 in the diencephalon would facilitate patterns of precopulatory and copulatory behaviors similar to those shown by intact cycling females. One E2 implant was placed in either the medial preoptic area (MPO) or AH and a second E2 implant was placed in the VMH. Control females were tested following E2 application at only the MPO or AH region in conjunction with a cholesterol implant in the VMH. An additional control group was tested with females implanted with cholesterol at both MPO-AH regions and the VMH. During a 2-day postimplantation test period, vaginal marking scores were elevated for both single and dual E2 implanted females and agonistic response patterns toward males declined significantly. In addition, a significant inverse relationship was found between the number of vaginal marks and bites exhibited by females with single E2 implants in the MPO, whereas these two response patterns were positively correlated in females with E2 stimulation occurring only in the AH region. No significant relationship was found between vaginal marking and biting attack for females receiving dual E2 stimulation. Systemic progesterone administration on the third postimplantation day facilitated sexual receptivity in the majority of females with dual E2 implants (greater than 90%). These receptive females displayed lordotic responsiveness that closely matches the full display of sexual receptivity shown by intact cycling females. In contrast, only one female with a single E2 implant in the AH region showed sexual responsiveness. The results demonstrate that: precopulatory vaginal marking and biting attack are mediated by E2 action in the MPO and AH but in a different manner; additional action of E2 in the VMH diminishes the distinctive precopulatory behavioral effects of E2 in the MPO and AH suggesting an influential role of the VMH in regulating sociosexual activities; and E2 action in either the MPO or AH region in conjunction with E2 action in the VMH may be necessary in order to facilitate the species-typical display of lordotic responsiveness." @default.
• W1998451903 created "2016-06-24" @default.
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• W1998451903 creator A5037019692 @default.
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• W1998451903 date "1985-12-01" @default.
• W1998451903 modified "2023-10-16" @default.
• W1998451903 title "Dual estradiol action in diencephalon and the regulation of sociosexual behavior in female golden hamsters" @default.
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• W1998451903 doi "https://doi.org/10.1016/0006-8993(85)91429-5" @default.
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