Functional characterization of mitochondrial oxidative phosphorylation in saponin-skinned human muscle fibers.
Biochim Biophys Acta
; 1144(1): 46-53, 1993 Aug 16.
Article
en En
| MEDLINE
| ID: mdl-8347661
The conditions of treatment of human skeletal muscle fibers from M. vastus lateralis with saponin were optimized to achieve complete permeabilization of cell membrane at intact mitochondrial oxidative phosphorylation. After 30 min of incubation with saponin all lactate dehydrogenase, 50% of creatine kinase, 30% of adenylate kinase and less than 20% of citrate synthase was released into the permeabilization medium. These skinned fibers behave similar to isolated mitochondria from human skeletal muscle: (i) the respiration with mitochondrial substrates can be stimulated by ADP, (ii) inhibited by carboxyatractyloside and (iii) it is possible to detect fluorescence changes of mitochondrial NAD(P)H on additions of substrates, uncoupler and cyanide. From a comparison of rates of respiration per cytochrome aa3 content of isolated human skeletal muscle mitochondria and saponin-skinned muscle fibers it was possible to calculate that almost 85% of mitochondria in those fibers are accessible for the investigation of oxidative phosphorylation. As shown by the investigation of biopsy samples of two patients with undefined myopathies these fibers are a suitable object for the replacement of isolated mitochondria in the diagnosis of mitochondrial myopathies and encephalomyopathies.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Fosforilación Oxidativa
/
Saponinas
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Mitocondrias Musculares
Límite:
Animals
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Child
/
Humans
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Male
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Middle aged
Idioma:
En
Revista:
Biochim Biophys Acta
Año:
1993
Tipo del documento:
Article
País de afiliación:
Alemania
Pais de publicación:
Países Bajos