Summary
Electron microscopic histochemistry was applied to the study of cytochrome c oxidase activity in each mitochondrion of biopsied muscles from four patients with mitochondrial myopathy [one case of fatal infantile mitochondrial myopathy, one case of myoclonus epilepsy associated with ragged-red fibers (MERRF), and two cases of mitochondrial myopathy, encephalopathy, lactic acidosis and stroke-like episodes (MELAS)]. In the patient with fatal infantile mitochondrial myopathy, intercellular heterogeneity of mitochondria was recognized. In the three patients with either MERRF or MELAS, cytochrome c oxidase activity was segmentally changed from positive to negative within single muscle fibers. In the two patients with MELAS, small groups of positive-stained mitochondria were located among negative-stained mitochondria in the negative segment of a few muscle fibers. These findings revealed that there were heterogeneous populations of normal and abnormal mitochondria intracellularly or intercellularly within the muscles of these patients.
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Supported in part by Grant-in-Aid for Scientific Research 63570422 from the Ministry of Education, Science and Culture, and Grant 62A-5-08 from the National Center of Neurology and Psychiatry (NCNP) of the Ministry of Health and Welfare, Japan
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Haginoya, K., Miyabayashi, S., Iinuma, K. et al. Mosaicism of mitochondria in mitochondrial myopathy: an electronmicroscopic analysis of cytochrome c oxidase. Acta Neuropathol 80, 642–648 (1990). https://doi.org/10.1007/BF00307633
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DOI: https://doi.org/10.1007/BF00307633