Thermoregulatory inversion: A novel thermoregulatory paradigm

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

To maintain core body temperature in mammals, the normal central nervous system (CNS) thermoregulatory reflex networks produce an increase in brown adipose tissue (BAT) thermogenesis in response to skin cooling and an inhibition of the sympathetic outflow to BAT during skin rewarming. In contrast, these normal thermoregulatory reflexes appear to be inverted in hibernation/torpor; thermogenesis is inhibited during exposure to a cold environment, allowing dramatic reductions in core temperature and metabolism, and thermogenesis is activated during skin rewarming, contributing to a return of normal body temperature. Here, we describe two unrelated experimental paradigms in which rats, a nonhibernating/torpid species, exhibit a “thermoregulatory inversion,” which is characterized by an inhibition of BAT thermogenesis in response to skin cooling, and a switch in the gain of the skin cooling reflex transfer function from negative to positive values. Either transection of the neuraxis immediately rostral to the dorsomedial hypothalamus in anesthetized rats or activation of A1 adenosine receptors within the CNS of free-behaving rats produces a state of thermoregulatory inversion in which skin cooling inhibits BAT thermogenesis, leading to hypothermia, and skin warming activates BAT, supporting an increase in core temperature. These results reflect the existence of a novel neural circuit that mediates inverted thermoregulatory reflexes and suggests a pharmacological mechanism through which a deeply hypothermic state can be achieved in nonhibernating/ torpid mammals, possibly including humans.

Original languageEnglish (US)
Pages (from-to)R779-R786
JournalAmerican Journal of Physiology - Regulatory Integrative and Comparative Physiology
Volume312
Issue number5
DOIs
StatePublished - May 30 2017

Fingerprint

Brown Adipose Tissue
Thermogenesis
Skin
Reflex
Rewarming
Body Temperature
Mammals
Central Nervous System
Torpor
Adenosine A1 Receptors
Hibernation
Temperature
Hypothermia
Hypothalamus
Pharmacology

Keywords

  • Brown adipose tissue
  • Hibernation
  • Hypothermia
  • Thermogenesis
  • Thermoregulation

ASJC Scopus subject areas

  • Physiology
  • Physiology (medical)

Cite this

Thermoregulatory inversion : A novel thermoregulatory paradigm. / Tupone, Domenico; Cano, Georgina; Morrison, Shaun.

In: American Journal of Physiology - Regulatory Integrative and Comparative Physiology, Vol. 312, No. 5, 30.05.2017, p. R779-R786.

Research output: Contribution to journalArticle

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