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Enzyme activity analyses along ragged-red and normal single muscle fibres

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Summary

Mitochondrial myopathies are morphologically characterized by ragged-red fibres (RRF). Serial cross-section revealed that the ragged-red appearance was only focal. This is in agreement with a partial cytochromec oxidase (COX) deficiency in chronic progressive external ophthalmoplegia (CPEO). Since most of these patients show deletions of the mitochondrial genome single fibre analyses were performed determining COX and succinate dehydrogenase (SDH) in serial muscle sections from two patients with CPEO. High SDH activity was demonstrated in RRF; in contrast COX activity was lower in RRF in a patient, possibly representing a focal assembly of mitochondria with deletions in their genomes. The variation of enzyme activities along the muscle fibre was especially high in RRF. This study presents the first quantitative evidence that enzyme activities vary considerably along fibres in muscle from patients with a mitochondrial myopathy.

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  1. Department of Neurology, University of Würzburg, Josef-Schneider-Strasse 11, W-8700, Würzburg, Federal Republic of Germany

    H. Reichmann

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  1. H. Reichmann
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Reichmann, H. Enzyme activity analyses along ragged-red and normal single muscle fibres. Histochemistry 98, 131–134 (1992). https://doi.org/10.1007/BF00717004

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  • DOI: https://doi.org/10.1007/BF00717004

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