Disruption of mitochondrial fission in the liver protects mice from diet-induced obesity and metabolic deterioration.

Abstract:

AIM/HYPOTHESIS:Mitochondria and the endoplasmic reticulum (ER) physically interact by close structural juxtaposition, via the mitochondria-associated ER membrane. Inter-organelle communication between the ER and mitochondria has been shown to regulate energy metabolism and to be central to the modulation of various key processes such as ER stress. We aimed to clarify the role of mitochondrial fission in this communication. METHODS:We generated mice lacking the mitochondrial fission protein dynamin-related protein 1 (DRP1) in the liver (Drp1LiKO mice). RESULTS:Drp1LiKO mice showed decreased fat mass and were protected from high-fat diet (HFD)-induced obesity. Analysis of liver gene expression profiles demonstrated marked elevation of ER stress markers. In addition, we observed increased expression of the fibroblast growth factor 21 (FGF21) gene through induction of activating transcription factor 4, master regulator of the integrated stress response. CONCLUSIONS/INTERPRETATION:Disruption of mitochondrial fission in the liver provoked ER stress, while inducing the expression of FGF21 to increase energy expenditure and protect against HFD-induced obesity.

journal_name

Diabetologia

journal_title

Diabetologia

authors

Wang L,Ishihara T,Ibayashi Y,Tatsushima K,Setoyama D,Hanada Y,Takeichi Y,Sakamoto S,Yokota S,Mihara K,Kang D,Ishihara N,Takayanagi R,Nomura M

doi

10.1007/s00125-015-3704-7

subject

Has Abstract

pub_date

2015-10-01 00:00:00

pages

2371-80

issue

10

eissn

0012-186X

issn

1432-0428

pii

10.1007/s00125-015-3704-7

journal_volume

58

pub_type

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