31P NMR examination of two patients with NADH-CoQ reductase deficiency

Mitochondrial myopathies are becoming increasingly recognized as uncommon causes of muscular disorders 1 characterized by weakness and severe exercise intolerance. Electron micrographs of the muscle show gross abnormality of the mitochondrial structure. Such defects are expected to affect the energy...

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Bibliographic Details
Published in:Nature (London) 1982-02, Vol.295 (5850), p.608-609
Main Authors: Radda, G. K., Bore, P. J., Gadian, D. G., Ross, B. D., Styles, P., Taylor, D. J., Morgan-Hughes, J.
Format: Article
Language:English
Subjects:
Adult
Female
Humanities and Social Sciences
Humans
Hydrogen-Ion Concentration
Kinetics
letter
Magnetic Resonance Spectroscopy
Male
Mitochondria, Muscle - physiology
multidisciplinary
Muscular Diseases - physiopathology
NAD(P)H Dehydrogenase (Quinone)
NADH, NADPH Oxidoreductases - deficiency
Phosphocreatine
Physical Exertion
Quinone Reductases - deficiency
Science
Science (multidisciplinary)
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Summary:Mitochondrial myopathies are becoming increasingly recognized as uncommon causes of muscular disorders 1 characterized by weakness and severe exercise intolerance. Electron micrographs of the muscle show gross abnormality of the mitochondrial structure. Such defects are expected to affect the energy metabolism of muscle but investigations in human subjects have necessarily been limited by the need for biopsy material. Following extensive phosphorus nuclear magnetic resonance ( 31 P NMR) measurements on isolated organs, tissues and selected parts of live animals (see ref. 2 for review), it has become possible to observe non-invasively the energy metabolism of human muscle in vivo 3–5 . Here, we report abnormal recovery of phosphocreatine (PCr) and p H after exercise of the forearm in two sisters, one of whom has been shown to have a mitochondrial NADH-coenzyme Q reductase deficiency and the other presumed to have the same defect on the basis of clinical symptoms, histology and biochemical studies of blood constituents 6 . Our results, together with studies on normal subjects and patients with impaired glycogen metabolism, allow the assessment of the relative importance of oxidative and glycolytic regeneration of high-energy phosphates during exercise and recovery.
ISSN:0028-0836
1476-4687
DOI:10.1038/295608a0