PMID: 2117841Jan 1, 1990Paper

Involvement of extraocular muscle in mitochondrial encephalomyopathy

Acta Neuropathologica
S TakedaF Ikuta

Abstract

We carried out a histological examination of the extraocular muscles (EOMs) in a case of myoclonus epilepsy associated with ragged-red fibers (MERRF) and two cases of mitochondrial myopathy, encephalopathy, lactic acidosis, and stroke-like episodes (MELAS), which did not manifest external ophthalmoplegia clinically. By light microscopy, many granular and vesicular fibers were seen associated with endomysial fibrosis. Electron microscopy revealed that the fibers showed prominent accumulation of abnormal mitochondria, extensive loss of myofibrils, proliferation of free sarcoplasmic reticulum and an increased amount of lipid vacuoles. These changes were more pronounced in MELAS than in MERRF. Hirano bodies were often seen in the subsarcolemmal area of muscle fibers and also in the intramuscular myelinated nerve fibers and axon terminals. These findings suggest the presence of mitochondrial myopathy of the EOMs in cases of MELAS and MERRF.

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Citations

Jan 1, 1995·Acta Neuropathologica·M NaumannH Reichmann
Jan 1, 1992·Clinical Neurology and Neurosurgery·G SicilianoG Bevilacqua
Feb 18, 1998·Current Opinion in Neurobiology·J D PorterJ K Brueckner
Nov 24, 2011·Evidence-based Complementary and Alternative Medicine : ECAM·Patrícia Muniz de MedeirosUlysses Paulino de Albuquerque
Feb 14, 2014·Proceedings. Biological Sciences·C Haris Saslis-LagoudakisVincent Savolainen
Jan 1, 1992·Neuromuscular Disorders : NMD·G SicilianoA Muratorio
Mar 4, 2014·Ultrastructural Pathology·H FujiokaC L Hoppel
Feb 1, 1997·American Journal of Ophthalmology·J A SorkinS R Lambert
Dec 20, 2007·Current Opinion in Clinical Nutrition and Metabolic Care·Johannes A MaassenD Margriet Ouwens
Sep 1, 1995·Acta Neurologica Scandinavica·C C HsuY H Wei
Jan 30, 2021·FEBS Letters·Uwe RichterSarah J Pickett

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