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• W2048339922 startingPage "55" @default.
• W2048339922 abstract "The medial preoptic nucleus (MPN) of the medial preoptic area (MPOA) and the medial amygdala are two brain regions in which male rat sexual behavior increased Fos-like immunoreactivity (Fos-Li). Dopamine is released in the MPOA during male rat sexual behavior and facilitates copulation. Psychostimulants, which increase dopamine levels, induce Fos-Li in the striatum through D1 receptors. We examined whether copulation-induced Fos-Li in the MPN was also mediated through D1 receptors. In Experiment 1, sexually inexperienced male rats that received the D1 antagonist Schering 39166 prior to their first sexual experience had fewer Fos-Li cells in the MPN than did those that received vehicle. In Experiment 2, no significant effect of the D1 antagonist was observed on copulation-induced Fos-Li in male rats that had received repeated sexual experiences prior to the drug test day. Sexual experience increases copulatory efficiency; the mechanisms by which this improvement occurs are unclear. In Experiment 3, copulation by highly experienced male rats led to greater Fos-Li in the MPN than did copulation by sexually naive males. Although there were no differences between groups in amygdala Fos-Li in these studies, in several groups Fos-Li in the medial amygdala was positively correlated with the post-ejaculatory interval. These experiments indicate that (1) stimulation of D1 receptors may contribute to the transient copulation-induced increase in Fos-Li in the MPN, and (2) repeated sexual experiences enhanced copulation-induced Fos-Li in the MPN, which may represent a marker of altered responsiveness of neurons in the MPN to sexual or conditioned stimuli." @default.
• W2048339922 created "2016-06-24" @default.
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• W2048339922 date "1999-05-01" @default.
• W2048339922 modified "2023-09-23" @default.
• W2048339922 title "Effects of a D1 antagonist and of sexual experience on copulation-induced Fos-like immunoreactivity in the medial preoptic nucleus" @default.
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• W2048339922 doi "https://doi.org/10.1016/s0006-8993(99)01338-4" @default.
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