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Hormone‐induced mitochondrial fission is utilized by brown adipocytes as an amplification pathway for energy expenditure
Author(s) -
Wikstrom Jakob D,
Mahdaviani Kiana,
Liesa Marc,
Sereda Samuel B,
Si Yaguang,
Las Guy,
Twig Gilad,
Petrovic Natasa,
Zingaretti Cristina,
Graham Adam,
Cinti Saverio,
Corkey Barbara E,
Can Barbara,
Nedergaard Jan,
Shirihai Orian S
Publication year - 2014
Publication title -
the embo journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 7.484
H-Index - 392
eISSN - 1460-2075
pISSN - 0261-4189
DOI - 10.1002/embj.201385014
Subject(s) - medical school , medicine , library science , gerontology , family medicine , medical education , computer science
Adrenergic stimulation of brown adipocytes ( BA ) induces mitochondrial uncoupling, thereby increasing energy expenditure by shifting nutrient oxidation towards thermogenesis. Here we describe that mitochondrial dynamics is a physiological regulator of adrenergically‐induced changes in energy expenditure. The sympathetic neurotransmitter Norepinephrine ( NE ) induced complete and rapid mitochondrial fragmentation in BA , characterized by Drp1 phosphorylation and Opa1 cleavage. Mechanistically, NE ‐mediated Drp1 phosphorylation was dependent on Protein Kinase‐A ( PKA ) activity, whereas Opa1 cleavage required mitochondrial depolarization mediated by FFA s released as a result of lipolysis. This change in mitochondrial architecture was observed both in primary cultures and brown adipose tissue from cold‐exposed mice. Mitochondrial uncoupling induced by NE in brown adipocytes was reduced by inhibition of mitochondrial fission through transient Drp1 DN overexpression. Furthermore, forced mitochondrial fragmentation in BA through Mfn2 knock down increased the capacity of exogenous FFA s to increase energy expenditure. These results suggest that, in addition to its ability to stimulate lipolysis, NE induces energy expenditure in BA by promoting mitochondrial fragmentation. Together these data reveal that adrenergically‐induced changes to mitochondrial dynamics are required for BA thermogenic activation and for the control of energy expenditure.