Role of the oxytocin receptor expressed in the rostral medullary raphe in thermoregulation during cold conditions

Yoshiyuki Kasahara, Yuko Tateishi, Yuichi Hiraoka, Ayano Otsuka, Hiroaki Mizukami, Keiya Ozawa, Keisuke Sato, Shizu Hidema, Katsuhiko Nishimori

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

Recent papers have reported that oxytocin (Oxt) and the oxytocin receptor (Oxtr) may be involved in the regulation of food intake in mammals. We therefore suspected the Oxt/Oxtr system to be involved in energy homeostasis. In previous studies, we found a tendency toward obesity in Oxtr-deficient (Oxtr-/-) mice, as well as impaired thermoregulation when these mice were exposed to cold conditions. In the present study, we observed the expression of Oxtr in the rostral medullary raphe (RMR), the brain region known to control thermogenesis in brown adipose tissue (BAT). Through immunohistochemistry, we detected neurons expressing Oxtr and c-Fos in the RMR of mice exposed to cold conditions. Up to 40% of Oxtr-positive neurons in RMR were classified as glutamatergic neurons, as shown by immunostaining using anti-VGLUT3 antibody. In addition, mice with exclusive expression of Oxtr in the RMR were generated by injecting an AAV-Oxtr vector into the RMR region of Oxtr-/- mice. We confirmed the recovery of thermoregulatory ability in the manipulated mice during exposure to cold conditions. Moreover, mice with RMR-specific expression of Oxtr lost the typical morphological change in BAT observed in Oxtr-/- mice. Additionally, increased expression of the β3-adrenergic receptor gene, Adrb3, was observed in BAT. These results are the first to show the critical role of RMR Oxtr expression in thermoregulation during cold conditions.

Original languageEnglish
Article number180
JournalFrontiers in Endocrinology
Volume6
Issue numberNOV
DOIs
Publication statusPublished - 2015

Keywords

  • Body thermoregulation
  • Energy homeostasis
  • Oxytocin
  • Oxytocin receptor
  • Rostral medullary raphe

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism

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