Benextramine, a putative neuropeptide Y receptor antagonist, attenuates the termination of receptivity.

Abstract:

:Sexual behavior in female rats is dependent on gonadal steroids. In ovariectomized rats, progesterone treatment typically exerts a biphasic effect on copulatory behavior induced by prior treatment with estradiol. Thus, there is an initial augmentation of the facilitative effect of estradiol occurring 4-10 h after progesterone. This is followed by a profound inhibitory effect, essentially terminating receptivity. We hypothesized that the receptivity terminating effect of progesterone could be due to increased synthesis and release of neuropeptide Y in relevant brain regions. Rats were tested for female sexual behavior 4 h after progesterone (52 h postestradiol). Immediately following this test, benextramine was administered (0, 3, or 15 mg/kg, IP). Subsequently, behavioral tests were administered 24, 48, 72, and 96 h postbenextramine. Benextramine treatment attenuated the inhibitory effects of progesterone on receptivity (lordosis quotients and percent of responding animals) without affecting either proceptive or rejection behaviors. These data suggest that blockade of NPY (and alpha-adrenergic) receptors is associated with selective enhancements of specific components of sexual behavior in female rats. Specifically, blockade of NPY receptors by benextramine is associated with continued receptivity.

journal_name

Physiol Behav

journal_title

Physiology & behavior

authors

Clark JT

doi

10.1016/0031-9384(92)90378-f

subject

Has Abstract

pub_date

1992-11-01 00:00:00

pages

965-9

issue

5

eissn

0031-9384

issn

1873-507X

pii

0031-9384(92)90378-F

journal_volume

52

pub_type

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