5-HT Receptors Modulate Dopamine D-mediated Maternal Effects

Overview

Journal Pharmacol Biochem Behav

Publisher Elsevier

Specialties Biochemistry
Pharmacology
Psychology
Social Sciences

Date 2019 Mar 25

PMID 30904543

Citations 5

Authors

Jun Gao

Leilei Chen

Ming Li

Affiliations

Soon will be listed here.

Abstract

Serotonin 5-HT receptors are expressed throughout the mesolimbic and mesocortical dopamine pathways, and manipulation of this receptor system has a profound impact on dopamine functions and dopamine-mediated behaviors. It is highly likely that 5-HT receptors may also modulate the D-mediated maternal effects. The present study investigated this issue and also explored the possible behavioral mechanisms. We tested the effects of two D drugs (an agonist quinpirole: 0.5, 1.0 mg/kg, and a potent D antagonist haloperidol: 0.05, 0.10 mg/kg, sc) and their combinations with two 5-HT drugs (a selective 5-HT agonist TCB-2: 2.5 mg/kg, and 5-HT antagonist MDL100907, 1.0 mg/kg, sc) on maternal behavior in Sprague-Dawley postpartum females. Individually, TCB-2 (2.5 mg/kg, sc) and quinpirole (0.5 and 1.0 mg/kg, sc) reduced pup preference and disrupted home-cage maternal behavior. In contrast, haloperidol (0.10 mg/kg, sc) only disrupted home-cage maternal behavior, but did not suppress pup preference. MDL100907 (1.0 mg/kg, sc) by itself had no effect on either pup preference or maternal behavior. When administered in combination, pretreatment of TCB-2 did not alter quinpirole's disruption of pup preference and home-cage maternal behavior (possibly due to the floor effect), however, it did enhance haloperidol's disruption of pup retrieval in the home cage. MDL100907 had no effect both quinpirole's and haloperidol's disruption of pup preference and home-cage maternal behavior. Interestingly, haloperidol attenuated TCB-2's disruptive effect on pup preference. These findings suggest that activation of 5-HT receptors tends to enhance D-mediated maternal disruption, whereas blockade of 5-HT receptors is less effective. They also suggest that 5-HT receptors may have a direct effect on maternal behavior independent of their interaction with D receptors. The possible behavioral and neural mechanisms by which 5-HT- and D2-mediated maternal effects and their interaction are discussed.

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