Abstract
The capability of complement fixation of pemphigus antibodies was tested using combined in vitro complement immunofluorescent (IF) staining methods. Three sera out of 25 serum samples from 22 pemphigus patients revealed positive reactions, while all other sera gave negative results. Specificity control tests confirmed the positive reactions to be specific for complement staining. Complement fixing pemphigus antibodies were titrated lower than corresponding IgG antibodies and were demonstrable only in the extensive stage of the disease. Thus, the present work supplied evidence that pemphigus antibodies fix complement in vitro. However, the discrepancy still remains between the in vivo deposition of complement in most cases of pemphigus and in vitro capability of complement fixation in only few cases. More investigations should be needed to explain the exact role of complement in pemphigus acantholysis.
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