Characterization of immune complexes containing cytomegalovirus‐specific IgM antibodies following a kidney graft

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Abstract
In order to demonstrate the viral specificity of IgM‐containing immune complexes (IgM‐CIC) detected by a C1q assay in renal allograft recipients developing a CMV infection, a technique is described allowing: (1) the dissociation of IgM‐CIC by action of an acid buffer, and (2) the characterization of the viral specificity of IgM antibodies released by this treatment. This step was performed by ELISA and Western Blot.When technique was applied to the follow‐up of a renal allograft recipient developing a recurrent CMV infection within 2 months post‐graft, it was found that the IgM‐CIC detected on the day of the graft were not CMV‐specific, whereas the IgM‐CIC detected during the second month after transplantation contained CMV‐specific IgM antibodies. These CMV‐specific IgM‐CIC were detected as early as the urinary viral excretion.It was shown by Western Blot analysis that these IgM antibodies reacted with a 45–47 kDa viral polypeptide which is a viral target for specific humoral response at the early phase of CMV infection.