The role of orexin-1 receptors in physiologic responses evoked by microinjection of PgE2 or muscimol into the medial preoptic area

Daniel Rusyniak, Dmitry Zaretsky, Maria V. Zaretskaia, Joseph A. DiMicco

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

The medial preoptic area (mPOA) of the hypothalamus has long been thought to play an important role in both fever production and thermoregulation. Microinjections of prostaglandin E2 (PgE2) or the GABAA agonist muscimol into the mPOA cause similar increases in body temperature, heart rate, and blood pressure. Microinjections of these compounds however evoke different behavioral responses with muscimol increasing and PgE2 having no effect on locomotion. The purpose of this study was to determine the role of orexin-1 receptors in mediating these dissimilar responses. Systemic injections of the orexin-1 receptor antagonist SB-334867 reduced temperature and cardiovascular responses produced by microinjections of muscimol, but had no effect on either response produced by PgE2. SB-334867 did not significantly decrease locomotion evoked by microinjections of muscimol into the mPOA. These data suggest that there are two central nervous system circuits involved in increasing body temperature, heart rate and blood pressure: one circuit activated by muscimol, involving orexin neurons, and a separate orexin-independent circuit activated by PgE2.

Original languageEnglish
Pages (from-to)162-166
Number of pages5
JournalNeuroscience Letters
Volume498
Issue number2
DOIs
StatePublished - Jul 8 2011

Fingerprint

Orexin Receptors
Muscimol
Preoptic Area
Microinjections
Dinoprostone
Locomotion
Body Temperature
Heart Rate
GABA-A Receptor Agonists
Blood Pressure
Body Temperature Regulation
Hypothalamus
Fever
Central Nervous System
Neurons
Injections
Temperature

Keywords

  • Hypothalamus
  • Microinjection
  • Muscimol
  • Orexin
  • Prostaglandin E2

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

The role of orexin-1 receptors in physiologic responses evoked by microinjection of PgE2 or muscimol into the medial preoptic area. / Rusyniak, Daniel; Zaretsky, Dmitry; Zaretskaia, Maria V.; DiMicco, Joseph A.

In: Neuroscience Letters, Vol. 498, No. 2, 08.07.2011, p. 162-166.

Research output: Contribution to journalArticle

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