Clin Exp Immunol 37(1): 76-82
PMC: PMC1537676
PMID: 385189
Viral infections and IgM autoantibodies to cytoplasmic intermediate filaments.
Abstract
Seventy-four out of 113 sera from patients with infectious hepatitis, chickenpox, measles and mumps reacted with both smooth muscle and cytoplasmic filaments in cultured fibroblasts and neuroblastoma. Five out of eighty-five control sera also reacted in this way. That the cytoplasmic structures are intermediate filaments was suggested by their rearrangement into coils of perinuclear filaments in colchicine- or vinblastine-treated fibroblasts, but not in cytochalasin B-treated cells. The idenity of these structures was confirmed by the demonstration that the same structures reacted with the post-viral sera and a rabbit and human anti-intermediate filament antibody. Immunoabsorption studies showed that twenty-seven out of thirty-two positive sera were neutralised by skeletin, the intermediate filament protein from smooth muscle. In all but one of the sera, the antibody was IgM. Antibody titres fell in the second specimen in eleven out of fourteen pairs of acute and convalescent sera. The association between viral infections and autoantibodies suggest that production of antibodies suggests that production of antibody to intermediate filaments may be initiated by viruses.
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