Document Detail

Inhibition of brown adipose tissue thermogenesis by neurons in the ventrolateral medulla and in the nucleus tractus solitarius.
MedLine Citation:
PMID:  20410479     Owner:  NLM     Status:  MEDLINE    
Neurons in the ventrolateral medulla (VLM) and in the nucleus tractus solitarius (NTS) play important roles in the regulation of cardiovascular and other autonomic functions. In the present study, we demonstrate an inhibition of brown adipose tissue (BAT) thermogenesis evoked by activation of neurons in the VLM, as well as by neurons in the intermediate NTS, of chloralose/urethane-anesthetized, artificially ventilated rats. Activation of neurons in either rostral VLM or caudal VLM with N-methyl-d-aspartate (12 nmol) reversed the cold-evoked increase in BAT sympathetic nerve activity (SNA), BAT temperature, and end-expired CO(2). Disinhibition of neurons in either VLM or NTS with the GABA(A) receptor antagonist, bicuculline (30 pmol), reversed the increases in BAT SNA, BAT temperature, and end-expired CO(2) that were elicited 1) by cold defense; 2) during the febrile model of nanoinjection of prostaglandin E(2) into the medial preoptic area; 3) by activation of neurons in the dorsomedial hypothalamus or in the rostral raphe pallidus (rRPa); or 4) by the micro-opioid receptor agonist fentanyl. Combined, but not separate, inhibitions of neurons in the VLM and in the NTS, with the GABA(A) receptor agonist, muscimol (120 pmol/site), produced increases in BAT SNA, BAT temperature, and expired CO(2), which were reversed by nanoinjection of glycine (30 nmol) into the rRPa. These findings suggest that VLM and NTS contain neurons whose activation inhibits BAT thermogenesis, that these neurons receive GABAergic inputs that are active under these experimental conditions, and that neurons in both sites contribute to the tonic inhibition of sympathetic premotor neuronal activity in the rRPa that maintains a low level of BAT thermogenesis in normothermic conditions.
Wei-Hua Cao; Christopher J Madden; Shaun F Morrison
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural     Date:  2010-04-21
Journal Detail:
Title:  American journal of physiology. Regulatory, integrative and comparative physiology     Volume:  299     ISSN:  1522-1490     ISO Abbreviation:  Am. J. Physiol. Regul. Integr. Comp. Physiol.     Publication Date:  2010 Jul 
Date Detail:
Created Date:  2010-06-25     Completed Date:  2010-07-08     Revised Date:  2013-05-29    
Medline Journal Info:
Nlm Unique ID:  100901230     Medline TA:  Am J Physiol Regul Integr Comp Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  R277-90     Citation Subset:  IM    
Oregon National Primate Research Center, Oregon Health and Science University, Beaverton, Oregon 97006, USA.
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MeSH Terms
Adipose Tissue, Brown / drug effects,  innervation,  physiology*
Bicuculline / pharmacology
Body Temperature / drug effects
Cardiovascular System / drug effects
Cold Temperature
D-Aspartic Acid / pharmacology
Hypothalamus / drug effects
Medulla Oblongata / drug effects
Muscimol / pharmacology
N-Methylaspartate / pharmacology
Neurons / drug effects,  physiology*
Preoptic Area / drug effects,  physiology
Rats, Sprague-Dawley
Sympathetic Nervous System / drug effects,  physiology
Thermogenesis / drug effects,  physiology*
Grant Support
Reg. No./Substance:
1783-96-6/D-Aspartic Acid; 2763-96-4/Muscimol; 485-49-4/Bicuculline; 6384-92-5/N-Methylaspartate

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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