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Immunoelectron microscopic classification of amyloid in renal biopsies

U Donini, S Casanova, P Zucchelli and RP Linke

Divisione di Nefrologia e Dialisi, Ospedale M. Malpighi, Bologna, Italy.

Recent classification of amyloidosis is based on the chemical type of amyloid protein involved. In this study, routinely embedded kidney biopsies from nine patients with generalized amyloidosis and renal involvement were tested by immunoelectron microscopy, using the protein A-gold technique, with a panel of antibodies against the following amyloid proteins: AA, A lambda, A kappa and AF. Among the antibodies, the anti-AA was monoclonal (mc1) and the others polyclonal. In all nine cases, only one type of antibody reacted with each amyloid type. Six cases were classified as AA and three cases as A lambda type. These classifications were in agreement with the clinical data and the results of serum and urine immunoelectrophoresis. The gold particles were always associated with amyloid fibrils. No reaction was evident when an amyloid type was stained by a non-corresponding antibody, or in the four control cases without amyloid. The results show that antigenic classification of amyloid is feasible on routinely processed ultra-thin epoxy sections by immunoelectron microscopy, and thus affords the possibility of retrospective studies.

Volume 37, Issue 7, pp. 1101-1106, 07/01/1989
Copyright © 1989 by The Histochemical Society


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