Progressive myopathy with a combined respiratory chain defect including Complex II

Fecha
2008-01-15Autor
Rodrigues, Andresa De Santi [UNIFESP]
Kiyomoto, Beatriz Hitomi [UNIFESP]
Oliveira, Acary Souza Bulle [UNIFESP]
Gabbai, Alberto Alain [UNIFESP]
Schmidt, Beny [UNIFESP]
Tengan, Celia Harumi [UNIFESP]
Tipo
ArtigoISSN
0022-510XEs parte de
Journal of the Neurological SciencesDOI
10.1016/j.jns.2007.08.002Metadatos
Mostrar el registro completo del ítemResumen
Biochemical defects in the respiratory chain are mostly associated with deficiencies in Complexes I, III and IV, caused by nuclear or mitochondrial DNA mutations. Combined defects including Complex II have been reported very rarely and have muscular symptoms as the main manifestation, including muscle weakness, exercise intolerance and myoglobinuria. We report a patient with a fatal progressive myopathy and muscle biopsy showing diffuse reduction in succinate dehydrogenase activity, ragged red fibers and intense lipid accumulation. Cytochrome c oxidase (COX) histochemistry demonstrated 30% of fibers with increased subsarcolemmal staining while 27% were COX negative. Western blotting analysis showed reduction in the expression of the 39 kDa subunit of Complex I, subunit II of Complex IV and the 70 kDa subunit of Complex II. Our findings suggest that the patient had a complex pattern of mitochondrial dysfunction affecting multiple respiratory chain complexes (I, II and IV) and fatty acid metabolism. This report adds a new histological pattern associated to combined deficiencies of respiratory chain with involvement of Complex II and shows that this disease may be fatal with a rapid progression. (c) 2007 Elsevier B.V. All rights reserved.
Cita
Journal of the Neurological Sciences. Amsterdam: Elsevier B.V., v. 264, n. 1-2, p. 182-186, 2008.Palabras clave
mitochondriasuccinate dehydrogenase
mitochondrial myopathies
respiratory chain
lipid metabolism
muscle
myopathies
Colecciones
- EPM - Artigos [17677]
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