Myositis in mixed connective tissue disease: A unique syndrome characterized by immunohistopathologic elements of both polymyositis and dermatomyositis

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Abstract

Objective: To characterize the inflammatory cells, the expression pattern of adhesion molecules (ICAM-1 and VCAM-1), membrane attack complex (C5b-9), and major histocompatibility complex (MHC) antigens in muscle biopsy of mixed connective tissue disease (MCTD). Method: We studied 14 patients with MCTD, and compared to 8 polimyositis (PM) patients, 5 dermatomyositis (DM) and 4 dystrophies. Inflammatory cells were examined for CD4+, CD8 +, memory and naïve T cells, natural killer cells, and macrophages. Expression of MHC-I and -II, ICAM-1, VCAM-1 and C5b-9 were characterized on muscle fibers and vessels. Results: Morphological analysis displayed a pattern of PM. Immunohistochemical study revealed a decreased number of capillaries, predominance of CD4+ and B cells in perivascular regions and predominance of CD8+ and CD45RO+ in endomysial regions. The expression of MHC-I on vessels and on degenerated muscle fibers, MHC-II expression on vessels and perifascicular muscle fibers, and the expression of ICAM-1 / VCAM-1 on endothelial cells indicated both vascular and cellular-immune mediated processes causing the muscular lesion. Conclusion: Our findings revealed a mixed mechanism in MCTD, both vascular involvement as DM, and cell-mediated like PM.

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Vianna, M. A. A. G., Borges, C. T. L., Borba, E. F., Caleiro, M. T. C., Bonfá, E., & Marie, S. K. N. (2004). Myositis in mixed connective tissue disease: A unique syndrome characterized by immunohistopathologic elements of both polymyositis and dermatomyositis. Arquivos de Neuro-Psiquiatria, 62(4), 923–934. https://doi.org/10.1590/s0004-282x2004000600001

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