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The Journal of Immunology, Vol 142, Issue 7 2244-2249, Copyright © 1989 by American Association of Immunologists

ARTICLES

Immunofluorescence analysis of IgA binding by human mononuclear cells in blood and lymphoid tissue

A Chevailler, RC Monteiro, H Kubagawa and MD Cooper
Department of Pediatrics, University of Alabama, Birmingham 35294.

The nature of IgA-binding cells and their tissue distribution was examined by an indirect immunofluorescence assay with the use of IgA1 and IgA2 paraproteins and fluorochrome- or biotin-labeled F(ab')2 fragments of idiotype-specific antibodies. The frequency of IgA-binding mononuclear cells was approximately 13% in blood and spleen samples but less than 1% in tonsil samples. IgA binding could be visualized by flow immunocytometry on monocyte/macrophages, but not on T and B cells. IgA polymers were bound better than IgA dimers and monomers. Nonhomologous IgA myelomas of both IgA1 and IgA2 subclasses inhibited the IgA-binding to monocytes, whereas aggregated normal serum IgG, IgM paraproteins, and an IgG myeloma did not. IgA binding was relatively insensitive to changes in temperature or cation concentration. IgA-binding monocytes were found in IgA-deficient patients at the same frequency as in normal individuals. The results indicate that monocytes constitutively express class-specific binding sites for both IgA1 and IgA2 molecules.


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