Abstract
The presence and the distribution of tumor necrosis factor-alpha, interferon-gamma, and p65 subunit of nuclear factor-kappaB, molecules known to induce synergistically and to mediate major histocompatibility complex (MHC) class I expression, were determined in muscle sections from control and X-linked vacuolated myopathy patients. MHC class I colocalized with tumor necrosis factor-alpha and interferon-gamma, as well as with p65, in most of the membrane attack complex- and/or calcium-positive muscle fibers in X-linked vacuolated myopathy. These results suggest that the expression of MHC class I in X-linked vacuolated myopathy could be induced by tumor necrosis factor-alpha and interferon-gamma and partly mediated by nuclear factor-kappaB.
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