Threshold for copulation-induced analgesia varies according to the ejaculatory endophenotypes in rats

Carlos E. Aguilar-Pérez, Porfirio Gómora-Arrati, Barry R. Komisaruk, Maria Reyna Fuentes-Morales, Julio César Morales-Medina, Oscar González-Flores, Rosa Angélica Lucio

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3 Scopus citations

Abstract

Analgesia may be modulated by multiple internal and external factors. In prior studies, copulatory-induced analgesia was demonstrated using the vocalization threshold to tail shock (VTTS) in male and female rats. Three ejaculatory endophenotypes have been characterized in male Wistar rats based upon their ejaculation latency (EL). Since intromissions and ejaculations produce analgesia, and these copulatory patterns are performed with different frequency depending on the male’s ejaculatory endophenotype, we hypothesized that copulation-induced analgesia would vary in relation to these endophenotypes. In the present study, we used three groups according to the EL (medians): rapid ejaculators (236 s; n = 21), intermediate ejaculators (663.2 s; n = 20) and sluggish ejaculators (1582.2 s; n = 8). Our aim was to evaluate whether copulation-induced analgesia is related to the ejaculatory endophenotypes during two consecutive ejaculatory series (EJS). In the first EJS, the VTTS of the rapid ejaculators was significantly higher than that of intermediate and sluggish rats. At the onset of the second EJS, the VTTS of the rapid and intermediate ejaculators was significantly higher than that of the sluggish rats. No differences in VTTS were observed during the first or second post-ejaculatory intervals among the three groups. These findings provide evidence that the more intromissions that occurred per unit time, the higher was the level of analgesia.

Original languageEnglish (US)
Pages (from-to)195-202
Number of pages8
JournalInternational Journal of Impotence Research
Volume34
Issue number2
DOIs
StatePublished - Mar 2022

All Science Journal Classification (ASJC) codes

  • Urology

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