TITLE

Identification of a target antigen in human anti-tubular basement membrane nephritis

AUTHOR(S)
Fliger, F. David; Wieslander, Jörgen; Brentjens, Jan R.; Andres, Giuseppe A.; Butkowski, Ralph J.
PUB. DATE
March 1987
SOURCE
Kidney International;Mar1987, Vol. 31 Issue 3, p800
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Sera from two patients with primary antitubular-basement-membrane-mediated tubulointerstitial nephritis, one a renal allograft recipient and the other with spontaneous antitubular-basement-membrane disease, were analyzed for the specificity of their autoantibodies. Both sera had circulating antibodies that reacted by ELISA with extracts of tubular basement membrane from several species, but failed to react significantly with extracts of glomerular basement membrane. Reactive antigen was solubilized with 6 M guanidine-HCl, 6 M urea, with reduction and alkylation, and with sodium dodecylsulfate. Digestion of the basement membrane with collagenase released relatively small quantities of antigen from the membrane, and trypsin and pepsin destroyed its antigenicity. The antigenic activity was characterized with respect to its size distribution by gel filtration and by immuno-overlay analysis of protein blots. Collectively, the results indicate that the major reactivity of both sera is directed towards a Mr 58,000 component that is unique to the tubular basement membrane. Minor reactivities toward high molecular weight components common to both glomerular and tubular basement membranes were detected by immuno-overlay analysis. This study identities an antigen that is involved in human anti-tubular-basement-membrane-mediated tubulointerstitial nephritis, and demonstrates an advantage of the use of denaturing extraction over proteolytic methods to prepare the antigen.
ACCESSION #
17672351

 

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