Gehrig 2016 Orphanet J Rare Dis

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Gehrig SM, Mihaylova V, Frese S, Mueller SM, Ligon-Auer M, Spengler CM, Petersen JA, Lundby C, Jung HH (2016) Altered skeletal muscle (mitochondrial) properties in patients with mitochondrial DNA single deletion myopath. Orphanet J Rare Dis 11:105.

» PMID: 27473873 Open Access

Gehrig SM, Mihaylova V, Frese S, Mueller SM, Ligon-Auer M, Spengler CM, Petersen JA, Lundby C, Jung HH (2016) Orphanet J Rare Dis

Abstract: Mitochondrial myopathy severely affects skeletal muscle structure and function resulting in defective oxidative phosphorylation. However, the major pathomechanisms and therewith effective treatment approaches remain elusive. Therefore, the aim of the present study was to investigate disease-related impairments in skeletal muscle properties in patients with mitochondrial myopathy. Accordingly, skeletal muscle biopsies were obtained from six patients with moleculargenetically diagnosed mitochondrial myopathy (one male and five females, 53 ± 9 years) and eight age- and gender-matched healthy controls (two males and six females, 58 ± 14 years) to determine mitochondrial respiratory capacity of complex I-V, mitochondrial volume density and fiber type distribution.

Mitochondrial volume density (4.0 ± 0.5 vs. 5.1 ± 0.8 %) as well as respiratory capacity of complex I-V were lower (P < 0.05) in mitochondrial myopathy and associated with a higher (P < 0.001) proportion of type II fibers (65.2 ± 3.6 vs. 44.3 ± 5.9 %). Additionally, mitochondrial volume density and maximal oxidative phosphorylation capacity correlated positively (P < 0.05) to peak oxygen uptake.

Mitochondrial myopathy leads to impaired mitochondrial quantity and quality and a shift towards a more glycolytic skeletal muscle phenotype.

Keywords: Bioenergetics, Fat oxidation, Mitochondria, Mitochondrial cytopathy, Neuromuscular disease, Skeletal muscle phenotype

O2k-Network Lab: CH Zurich Lundby C, CH Zurich University of Zurich Physiology


Labels: MiParea: Respiration, mtDNA;mt-genetics, Exercise physiology;nutrition;life style, mt-Medicine, Patients  Pathology: Myopathy 

Organism: Human  Tissue;cell: Skeletal muscle  Preparation: Permeabilized tissue 


Coupling state: LEAK, OXPHOS  Pathway: F, N, S, CIV, NS, Other combinations, ROX  HRR: Oxygraph-2k 

2016-09