• Xi Yin, Qian Wang, Ting Chen, Junwei Niu, Rui Ban, Jiexiao Liu, Yanling Mao, and Chuanqiang Pu.
• Department of Neurology, Chinese PLA General Hospital 28 Fuxing Road, Haidian District, Beijing 100853, China.
• Int J Clin Exp Patho. 2015 Jan 1; 8 (3): 3069-75.

ObjectiveDysferlin is a sarcolemmal protein that plays an important role in membrane repair by regulating vesicle fusion with the sarcolemma. Mutations in the dysferlin gene (DYSF) lead to multiple clinical phenotypes, including Miyoshi myopathy (MM), limb girdle muscular dystrophy type 2B (LGMD 2B), and distal myopathy with anterior tibial onset (DMAT). Patients with dysferlinopathy also show muscle inflammation, which often leads to a misdiagnosis as inflammatory myopathy. In this study, we examined and analyzed the dyferlinopathy-associated immunological features.MethodsComparative immunohistochemical analysis of inflammatory cell infiltration, and muscle expression of MHC-I and C5b-9 was performed using muscle biopsy samples from 14 patients with dysferlinopathy, 7 patients with polymyositis, and 8 patients with either Duchenne muscular dystrophy or Becker muscular dystrophy (DMD/BMD).ResultsImmunohistochemical analysis revealed positive staining for immune response-related CD4+ cells, macrophages, MHC-I and C5b-9 in dysferlinopathy, which is in a different mode of polymyositis and DMD/BMD.ConclusionThese results demonstrated the involvement of immune factors in the pathogenesis of dysferlinopathy.

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