Prolactin-releasing peptide regulates the cardiovascular system via corticotrophin-releasing hormone

T. Yamada, A. Mochiduki, Y. Sugimoto, Y. Suzuki, Keiichi Itoi, Kinji Inoue

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

Prolactin-releasing peptide (PrRP)-producing neurones are known to be localised mainly in the medulla oblongata and to act as a stress mediator in the central nervous system. In addition, central administration of PrRP elevates the arterial pressure and heart rate. However, the neuronal pathway of the cardiovascular effects of PrRP has not been revealed. In the present study, we demonstrate that PrRP-immunoreactive neurones projected to the locus coeruleus (LC) and the paraventricular nucleus (PVN) of the hypothalamus. The c- fos positive neurones among the noradrenaline cells in the LC, and the parvo- and magnocellular neurones in the PVN, were increased after central administration of PrRP. The arterial pressure and heart rate were both elevated after i.c.v. administration of PrRP. Previous studies have demonstrated that PrRP stimulated the neurones in the PVN [i.e. oxytocin-, vasopressin- and corticotrophin-releasing hormone (CRH)-producing neurones], which suggests that PrRP may induce its cardiovascular effect via arginine vasopressin (AVP) or CRH. Although the elevation of blood pressure and heart rate elicited by PrRP administration were not inhibited by an AVP antagonist, they were completely suppressed by treatment with a CRH antagonist. Thus, we conclude that PrRP stimulated CRH neurones in the PVN and that CRH might regulate the cardiovascular system via the sympathetic nervous system.

Original languageEnglish
Pages (from-to)586-593
Number of pages8
JournalJournal of Neuroendocrinology
Volume21
Issue number6
DOIs
Publication statusPublished - 2009 May 29

Keywords

  • Cardiovascular system
  • Corticotrophin-releasing hormone
  • Noradrenaline
  • Prolactin-releasing peptide
  • Stress

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Endocrinology
  • Endocrine and Autonomic Systems
  • Cellular and Molecular Neuroscience

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