UNIGE document Scientific Article
previous document  unige:19099  next document
add to browser collection
Title

Nonshivering thermogenesis protects against defective calcium handling in muscle

Authors
Aydin, Jan
Shabalina, Irina G.
Reiken, Steven
Zhang, Shi-Jin
Bellinger, Andrew M.
Nedergaard, Jan
Cannon, Barbara
show hidden authors show all authors [1 - 11]
Published in FASEB Journal. 2008, vol. 22, no. 11, p. 3919-3924
Abstract When acutely exposed to a cold environment, mammals shiver to generate heat. During prolonged cold exposure, shivering is replaced by adaptive adrenergic nonshivering thermogenesis with increased heat production in brown adipose tissue due to activation of uncoupling protein-1 (UCP1). This cold acclimation is associated with chronically increased sympathetic stimulation of skeletal muscle, which may increase the sarcoplasmic reticulum (SR) Ca(2+) leak via destabilized ryanodine receptor 1 (RyR1) channel complexes. Here, we use genetically engineered UCP1-deficient (UCP1-KO) mice that rely completely on shivering in the cold. We examine soleus muscle, which participates in shivering, and flexor digitorum brevis (FDB) muscle, a distal and superficial muscle that does not shiver. Soleus muscles of cold-acclimated UCP1-KO mice exhibited severe RyR1 PKA hyperphosphorylation and calstabin1 depletion, as well as markedly decreased SR Ca(2+) release and force during contractions. In stark contrast, the RyR1 channel complexes were little affected, and Ca(2+) and force were not decreased in FDB muscles of cold-acclimated UCP1-KO mice. These results indicate that activation of UCP1-mediated heat production in brown adipose tissue during cold exposure reduces the necessity for shivering and thus prevents the development of severe dysfunction in shivering muscles.
Keywords Acclimatization/*physiologyAdipose Tissue, Brown/metabolismAnimalsCalcium/*metabolismCold TemperatureCyclic AMP-Dependent Protein Kinases/genetics/metabolismIon Channels/genetics/*metabolismMiceMice, KnockoutMitochondrial Proteins/genetics/*metabolismMuscle Proteins/genetics/*metabolismMuscle, Skeletal/*metabolismPhosphorylationRyanodine Receptor Calcium Release Channel/genetics/metabolismShivering/physiologyThermogenesis/*physiology
Identifiers
PMID: 18687806
Full text
Article - document accessible for UNIGE members only Limited access to UNIGE
Other version: http://www.fasebj.org/content/22/11/3919.full.pdf
Structures
Citation
(ISO format)
AYDIN, Jan et al. Nonshivering thermogenesis protects against defective calcium handling in muscle. In: FASEB Journal, 2008, vol. 22, n° 11, p. 3919-3924. https://archive-ouverte.unige.ch/unige:19099

224 hits

0 download

Update

Deposited on : 2012-03-27

Export document
Format :
Citation style :