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. 1989 May;76(2):204–209.

Characterization of circulating idiotypes containing immune complexes and their presence in the glomerular mesangium in patients with IgA nephropathy.

J González-Cabrero 1, J Egido 1, F Mampaso 1, M C Rivas 1, L Hernando 1
PMCID: PMC1541832  PMID: 2667819

Abstract

The possible pathogenic role for idiotype-anti-idiotype interactions in kidney diseases has recently been suggested. Since patients with IgA nephropathy often present antibodies against alimentary antigens, like bovine serum albumin (BSA), we isolated an idiotypic antibody with BSA specificity from one of these patients. By means of a specific anti-idiotypic antibody raised in rabbits, we have studied the participation of these idiotypes in circulating and renal deposited immune complexes (IC) in patients with IgA nephropathy. On indirect immunofluorescence, the presence of cross-reactive idiotypes was detected in the glomeruli of 12 out of 42 (28%) patients with IgA nephropathy, but in none of 15 membranous or mesangiocapillary nephritis examined. The staining was located within mesangial and paramesangial areas, with a similar, but less intensive, pattern distribution than IgA. Previous adsorption of rabbit anti-idiotype antibodies on an idiotype-Sepharose column completely abolished that staining. A close relationship was found between the presence of cross-reactive idiotypes on mesangial immunoglobulins and the existence of increased levels of serum idiotypes and idiotype-containing IC. Serum analytical ultracentrifugation showed that circulating IC containing idiotypes have chiefly a large (greater than 19 S) and intermediate (13 S-19 S) size, while those containing anti-BSA antibodies were only between 7 S-13 S fractions, or absent. Our results suggest that in patients with IgA nephropathy, shared idiotypes participate in the formation of circulating and renal deposited IC. It is possible that the apposition of free anti-idiotype to idiotype already bound to glomeruli, and vice versa, could contribute to increasing the amount and size of mesangial immune deposits, and, therefore, facilitate or perpetuate tissue injury.

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Selected References

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