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Proc Natl Acad Sci U S A. 2017 Mar 7;114(10):2705-2710. doi: 10.1073/pnas.1700997114. Epub 2017 Feb 21.

Mitochondrial energy deficiency leads to hyperproliferation of skeletal muscle mitochondria and enhanced insulin sensitivity.

Author information

1
Center for Mitochondrial and Epigenomic Medicine, The Children's Hospital of Philadelphia, Philadelphia, PA 19104.
2
Department of Pathology and Laboratory Medicine, University of Pennsylvania, Philadelphia, PA 19104.
3
Department of Biomedical and Health Informatics, Children's Hospital of Philadelphia, Philadelphia, PA 19104.
4
Département des Sciences de l'Activité Physique, Faculté des Sciences, Université du Québec à Montréal, Montreal, QC, Canada H2L 2C4.
5
Département de Neurosciences, Faculté de Médecine, Université de Montréal, Montreal, QC, Canada H3T 1J4.
6
Department of Kinesiology, McGill University Health Center, McGill University, Montreal, QC, Canada H3A 0G4.
7
Center for Mitochondrial and Epigenomic Medicine, The Children's Hospital of Philadelphia, Philadelphia, PA 19104; wallaced1@email.chop.edu.

Abstract

Diabetes is associated with impaired glucose metabolism in the presence of excess insulin. Glucose and fatty acids provide reducing equivalents to mitochondria to generate energy, and studies have reported mitochondrial dysfunction in type II diabetes patients. If mitochondrial dysfunction can cause diabetes, then we hypothesized that increased mitochondrial metabolism should render animals resistant to diabetes. This was confirmed in mice in which the heart-muscle-brain adenine nucleotide translocator isoform 1 (ANT1) was inactivated. ANT1-deficient animals are insulin-hypersensitive, glucose-tolerant, and resistant to high fat diet (HFD)-induced toxicity. In ANT1-deficient skeletal muscle, mitochondrial gene expression is induced in association with the hyperproliferation of mitochondria. The ANT1-deficient muscle mitochondria produce excess reactive oxygen species (ROS) and are partially uncoupled. Hence, the muscle respiration under nonphosphorylating conditions is increased. Muscle transcriptome analysis revealed the induction of mitochondrial biogenesis, down-regulation of diabetes-related genes, and increased expression of the genes encoding the myokines FGF21 and GDF15. However, FGF21 was not elevated in serum, and FGF21 and UCP1 mRNAs were not induced in liver or brown adipose tissue (BAT). Hence, increased oxidation of dietary-reducing equivalents by elevated muscle mitochondrial respiration appears to be the mechanism by which ANT1-deficient mice prevent diabetes, demonstrating that the rate of mitochondrial oxidation of calories is important in the etiology of metabolic disease.

KEYWORDS:

ANT1; insulin sensitivity; mitochondria; skeletal muscle

PMID:
28223503
PMCID:
PMC5347565
DOI:
10.1073/pnas.1700997114
[Indexed for MEDLINE]
Free PMC Article

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