Summary
The nephritogenic antigen that induces antiglomerular basement membrane antibody-induced glomerulonephritis (anti-GBM nephritis) in rats was isolated from collagenase-solubilized bovine renal basement membranes. Purification was achieved using antibody-coupled affinity columns which were originally used for the purification of trypsin-solubilized nephritogenic antigen (Sado et al. 1984a). The nephritogenic antigen was a heteropolymer composed of P2 (Mr 28 kDa) and P3 (Mr 30 kDa) polypeptides as monomers and their dimers in sodium-dodecyl-sulfate (SDS) polyacryl amide gel electrophoresis. The P3 polypeptide was considered to be the nephritogenic epitope, since a fraction composed of the P2 polypeptide alone was not nephritogenic.
The properties of the nephritogenic epitope were the same as those of the Goodpasture epitope (M2*), which is a noncollagenous domain of the α3 chain of type IV collagen (Butkowski et al. 1985; Saus et al. 1988), indicating that the nephritogenic antigen is the same as the Goodpasture antigen.
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Sado, Y., Kagawa, M., Naito, I. et al. Properties of bovine nephritogenic antigen that induces anti-GBM nephritis in rats and its similarity to the Goodpasture antigen. Virchows Archiv B Cell Pathol 60, 345–351 (1991). https://doi.org/10.1007/BF02899566
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DOI: https://doi.org/10.1007/BF02899566