Cited by 60Thermoregulation and physiological responsesThermal Regulation in MedicineNeuroscience of respiration and sleep

Roles of two preoptic cell groups in tonic and febrile control of rat tail sympathetic fibers

Tanaka, Mutsumi, McKinley, Michael J., McAllen, Robin M.·2009·American Journal of Physiology-Regulatory, Integrative and Comparative Physiology

Abstract

In response to cold and in fever, heat dissipation from the skin is reduced by sympathetic vasoconstriction. The preoptic region has been implicated in regulating basal, thermal, and febrile vasoconstriction of cutaneous vessels such as the rat's tail, but the neurons responsible for these functions have not been well localized. We recorded activity from single sympathetic nerve fibers supplying tail vessels in urethane-anesthetized rats, while microinjections of GABA (300 mM, 15-30 nl) were used to inhibit neurons in different parts of the preoptic region. Tail fiber activity increased promptly after GABA injections in two distinct regions: a rostromedial preoptic region (RMPO) centered around the organum vasculosum of the lamina terminalis, and a second region centered approximately 1 mm caudolaterally (CLPO). Responses to GABA within each region were similar. The febrile mediator, PGE(2) (0.2 or 1 ng in 15 nl) was then microinjected into GABA-sensitive preoptic sites. Injections of PGE(2) into the RMPO induced a rapid increase in tail fiber activity followed by a rise in core temperature; injections into the rostromedial part of CLPO gave delayed tail fiber responses; injections into the central and caudal parts of CLPO were without effect. These results indicate that neurons in two distinct preoptic regions provide tonic inhibitory drive to the tail vasoconstrictor supply, but febrile vasoconstriction is mediated by PGE(2) selectively inhibiting neurons in the rostromedial region.

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Crossref · 10.1152/ajpregu.91010.2008

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Authors
Tanaka, M., McKinley, M. J., & McAllen, R. M.
Affiliations
The University of Melbourne (AU)
Venue
American Journal of Physiology-Regulatory, Integrative and Comparative Physiology
Published
2009-04
Volume
296
Issue
4
Pages
R1248-R1257
ISSN
  • 0363-6119 (ISSN-L)
  • 1522-1490
OpenAlex
W2033887998
Cited by
60
References
48
Citations by year
2026: 1 · 2023: 2 · 2022: 2 · 2021: 4 · 2020: 2 · 2018: 10 · 2017: 4 · 2016: 4 · 2015: 4 · 2014: 5 · 2013: 3 · 2012: 6
FWCI
3.98
Type
journal article
Language
en
Open access
closed
Locations
  • American Journal of Physiology-Regulatory, Integrative and Comparative Physiology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Physiology › Thermoregulation and physiological responses
  • Health Sciences › Medicine › Critical Care and Intensive Care Medicine › Thermal Regulation in Medicine
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Neuroscience of respiration and sleep
Keywords
preoptic area, organum vasculosum of the lamina terminalis, cutaneous vasoconstriction, prostaglandin E2, fever, thermoregulation, core body temperature
MeSH terms
Adrenergic Fibers, Animals, Blood Vessels, Body Temperature Regulation, Cold Temperature, Fever, gamma-Aminobutyric Acid, Male, Microinjections, Neural Inhibition, Neural Pathways, Preoptic Area, Skin, Sympathetic Nervous System, Tail, Time Factors, Vasoconstriction, Dinoprostone, Rats, Sprague-Dawley, Rats

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