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Hohlfeld, R; Engel, A G; Goebels, N; Behrens, L
Current opinion in rheumatology 9, Številka: 6Journal Article
The inflammatory myopathies include dermatomyositis, polymyositis, and inclusion body myositis. In dermatomyositis, muscle fiber injury is secondary to an antibody- or immune-complex-mediated immune response against a vascular-endothelial component. In polymyositis and inclusion body myositis, CD8+ T cells and macrophages invade and eventually destroy initially nonnecrotic muscle fibers. The autoaggressive T cells have the phenotype of activated (HLA-DR+) memory (CD45RO+) cells. T-cell receptor analyses indicate that the autoaggressive T cells are oligoclonal. In inflammatory lesions, muscle fibers express various cytoplasmic and surface molecules that are not detectable in normal fibers. These molecules, which include HLA class I antigens, heat-shock proteins, adhesion molecules, and Fas, are probably induced by locally secreted cytokines. The autoaggressive CD8+ T cells harbor granules containing perforin that aggregate near the contact zone with the target muscle fiber. This is consistent with a perforin- and secretion-dependent mechanism of muscle fiber injury. Many invaded muscle fibers also express the Fas "death receptor," but signs of apoptosis are absent.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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