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Renal biopsy specimens from 8 patients with IgA nephropathy (Berger's disease) were examined immunocytochemically at the light and electron microscopic levels with peroxidase-labeled antibodies to IgA, IgM, J chain and secretory component. In 2 of the 8 specimens heavy deposits of IgA, but no IgM, were found in the mesangium. After acid-urea treatment of these tissue sections, J chain, a subunit of polymeric immunoglobulins, was identified in a distribution similar to that of IgA. In the remaining 6 specimens, small amounts of IgM in addition to denser deposits of IgA and J chains were found. We conclude that the IgA deposits in at least some patients with Berger's disease consist of IgA polymers linked by J chain.
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