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TWEAK promotes exercise intolerance by decreasing skeletal muscle oxidative phosphorylation capacity

Sato, S and Ogura, Y and Mishra, V and Shin, J and Bhatnagar, S and Hill, BG and Kumar, A (2013) TWEAK promotes exercise intolerance by decreasing skeletal muscle oxidative phosphorylation capacity. Skeletal Muscle, 3 (1).

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Abstract

Background: Proinflammatory cytokine tumor necrosis factor (TNF)-like weak inducer of apoptosis (TWEAK) and its receptor Fn14 are the major regulators of skeletal muscle mass in many catabolic conditions. However, their role in muscle metabolism remains largely unknown. In the present study, we investigated the role of TWEAK on exercise capacity and skeletal muscle mitochondrial content and oxidative metabolism.Methods: We employed wild-type and TWEAK-knockout (KO) mice and primary myotube cultures and performed biochemical, bioenergetics, and morphometric assays to evaluate the effects of TWEAK on exercise tolerance and muscle mitochondrial function and angiogenesis.Results: TWEAK-KO mice showed improved exercise tolerance compared to wild-type mice. Electron microscopy analysis showed that the abundance of subsarcolemmal and intermyofibrillar mitochondria is significantly increased in skeletal muscle of TWEAK-KO mice compared to wild-type mice. Furthermore, age-related loss in skeletal muscle oxidative capacity was rescued in TWEAK-KO mice. Expression of a key transcriptional regulator peroxisome proliferator-activated receptor γ coactivator 1α (PGC-1α) and several other molecules involved in oxidative metabolism were significantly higher in skeletal muscle of TWEAK-KO mice. Moreover, treatment of primary myotubes with soluble TWEAK inhibited the expression of PGC-1α and mitochondrial genes and decreased mitochondrial respiratory capacity. Deletion of TWEAK also improved angiogenesis and transcript levels of vascular endothelial growth factor in skeletal muscle of mice.Conclusions: These results demonstrate that TWEAK decreases mitochondrial content and oxidative phosphorylation and inhibits angiogenesis in skeletal muscle. Neutralization of TWEAK is a potential approach for improving exercise capacity and oxidative metabolism in skeletal muscle. © 2013 Sato et al.; licensee BioMed Central Ltd.

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Details

Item Type: Article
Status: Published
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Sato, S
Ogura, Y
Mishra, V
Shin, J
Bhatnagar, S
Hill, BG
Kumar, A
Date: 8 July 2013
Date Type: Publication
Journal or Publication Title: Skeletal Muscle
Volume: 3
Number: 1
DOI or Unique Handle: 10.1186/2044-5040-3-18
Schools and Programs: School of Medicine > Medicine
Refereed: Yes
Date Deposited: 30 Sep 2016 14:09
Last Modified: 13 Oct 2017 20:56
URI: http://d-scholarship.pitt.edu/id/eprint/29708

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