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1.
Neurology ; 73(1): 71-2, 2009 Jul 07.
Artigo em Inglês | MEDLINE | ID: mdl-19564587
3.
Acta Neuropathol ; 104(3): 260-6, 2002 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-12172911

RESUMO

Two patients with long-term corticosteroid administration sporadically developed limb muscle wasting followed by ophthalmoplegia, and the skeletal muscle pathology revealed ragged-red fibers (RRFs) with abnormal mitochondria, in addition to the findings of corticosteroid myopathy. The oculoskeletal symptoms of the present cases resemble those of chronic progressive external ophthalmoplegia, a type of mitochondrial disease. The ocular muscles have more RRFs than limb muscles, and large multiple deletions of mitochondrial DNA was detected in ocular and limb muscles of the two patients by PCR but not by Southern blotting. Immunohistochemistry demonstrated that 8-hydroxy-deoxyguanosine (8-OH-dG) and 4-hydroxy-2-nonenal were intensely stained in skeletal muscles of these patients particularly in RRFs. High-performance liquid chromatography with electrochemical detection analysis revealed an increase in 8-OH-dG from mitochondrial DNA. These findings may suggest that long-term corticosteroid administration potentially induces oxidative stress-mediated mitochondrial damage, resulting in the development of the oculoskeletal symptoms in some patients.


Assuntos
Anti-Inflamatórios/efeitos adversos , Desoxiguanosina/análogos & derivados , Mitocôndrias Musculares/patologia , Oftalmoplegia Externa Progressiva Crônica/induzido quimicamente , Prednisolona/efeitos adversos , 8-Hidroxi-2'-Desoxiguanosina , Aldeídos/metabolismo , Desoxiguanosina/metabolismo , Diagnóstico Diferencial , Teste de Esforço , Feminino , Deleção de Genes , Humanos , Ácido Láctico/sangue , Masculino , Pessoa de Meia-Idade , Mitocôndrias Musculares/metabolismo , Músculos Oculomotores/enzimologia , Músculos Oculomotores/patologia , Músculos Oculomotores/fisiopatologia , Oftalmoplegia Externa Progressiva Crônica/enzimologia , Oftalmoplegia Externa Progressiva Crônica/fisiopatologia , Superóxido Dismutase/metabolismo , Fatores de Tempo
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