| ORIGINAL ARTICLE |
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| Year : 2013 | Volume
: 61
| Issue : 6 | Page : 614--621 |
Major histocompatibility complex and inflammatory cell subtype expression in inflammatory myopathies and muscular dystrophies
Madhu Nagappa1, Atchayaram Nalini1, Gayathri Narayanappa2
1 Department of Neurology, National Institute of Mental Health and Neurosciences, Bangalore, Karnataka, India
2 Department of Neuropathology, National Institute of Mental Health and Neurosciences, Bangalore, Karnataka, India
Correspondence Address:
Atchayaram Nalini
Professor and Head, Neuromuscular specialist Department of Neurology, National Institute of Mental Health and Neurosciences, Hosur Road, Bangalore - 560 029, Karnataka
India
 Source of Support: None, Conflict of Interest: None  | Check |
DOI: 10.4103/0028-3886.125264
Background: In inflammatory myopathies muscle biopsy is a crucial diagnostic test. Misinterpretation between inflammatory myopathies and muscular dystrophies with inflammation is known. Materials and Methods: Thirty-one patients clinically and pathologically diagnosed to have polymyositis and dermatomyositis and 16 patients of muscular dystrophy with inflammation were studied for MHC-I, MHC-II, CD4 and CD8 expression in skeletal muscle tissue. Results: MHC-I upregulation was noted in all samples of PM and DM. Interstitial and perivascular inflammation in PM were predominantly CD8+ cells, in dermatomyositis, interstitial and perimysial perivascular inflammatory cells were CD4+ T cells and CD8+ T cells were seen around endomysial vessels. Interestingly MHC-I upregulation was seen in all 16 cases of muscular dystrophy with presence of inflammation. Conclusion: The pattern of MHC-I and II expression appeared to be similar in both inflammatory myopathies as well as in muscular dystrophies with inflammation and hence differentiating them on MHC - I expression was difficult.
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