Abstract
We describe clinical, morphological and biochemical findings of a patient with reducing body myopathy (RBM). This 15-year-old patient was affected by severe limb-girdle progressive myopathy with asymmetric distribution. Muscle biopsy showed many fibers with cytoplasmic polymorphic masses, which stained dark purple with modified Gomori's trichrome, associated with proliferation of cytoplasmic bodies. Cytoplasmic polymorphic masses showed marked reducing activity with menadione-nitro blue tetrazolium reaction. Ultrastructurally, there was great amount of highly electron-dense tubular-filamentous structures of 16–17 nm in diameter. Immunohistochemistry showed that many fibers were positive for desmin. Sodium dodecyl sulfate-electrophoresis disclosed an increase in two bands of approximately 53 and 70 kDa, and Western blot demonstrated that the 53-kDa band was desmin. It was not possible to characterize the 70-kDa protein further.
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Supported by Telethon and institutional funds of the Consiglio Nazionale delle Ricerche
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Bertini, E., Salviati, G., Apollo, F. et al. Reducing body myopathy and desmin storage in skeletal muscle: morphological and biochemical findings. Acta Neuropathol 87, 106–112 (1994). https://doi.org/10.1007/BF00386261
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DOI: https://doi.org/10.1007/BF00386261