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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Renal antigens in mercuric chloride induced, anti-GBM autoantibody glomerular disease.

Two antibody probes were used to characterize the putative renal antigens of HgCl2-induced antiglomerular basement membrane renal disease in Brown Norway (BN) rat. The first probe was the linear immunofluorescence imparting, in vivo bound, nephritogenic antiglomerular-basement-membrane autoantibody (anti-GBM-Ab). The second probe was a rat monoclonal antibody to the B subunit of laminin that was obtained from fusion of spleen cells of HgCl2 injected BN rat. By enzyme-linked immunosorbent assay (ELISA) the anti-GBM-Ab reacted with laminin, type IV collagen, collagenase-resistant noncollagenous portion of glomerular basement membrane (GBM), saline soluble proteins of kidney cortex homogenate and fibronectin. Western blot analysis of laminin indicated that the reactive epitopes detected by both probes were on the B chain subunit but not the A subunit. In nonreduced collagenase-digested GBM the epitopes were present on 27 kD and 42 to 48 kD polypeptides. A similar pattern was seen on collagenase-digested human GBM. On rat and human GBM the patterns obtained with rat autoantibody and autoantibody from a patient with Goodpasture syndrome were similar, suggesting that some of the in vivo bound anti-GBM autoantibodies in HgCl2-induced disease in rat are directed against epitopes which are similar to the Goodpasture antigen of human. Reactive epitopes were also detected on saline soluble proteins of kidney cortex homogenate with the predominant antigen being a 31 kD polypeptide. In the saline soluble proteins the reactive polypeptides including the major 31 kD polypeptide did not originate from laminin, type IV collagen, or the collagenase-resistant noncollagenous part of GBM. The precise structural origin of soluble proteins was not defined.(ABSTRACT TRUNCATED AT 250 WORDS)[1]


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