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- W2152667713 abstract "Tubular basement membrane (TBM) was prepared from normal human kidneys and solubilized with various enzymes. Collagenase digestion released antigenic moieties from the TBM. All four anti-TBM antibodies we studied, three from patients with idiopathic tubulo-interstitial nephritis (TIN) and one from a renal allograft recipient, distinctively reacted with collagenase-digested (CD) TBM during enzyme-linked immunoassay and could discriminate among sera of normal controls or of other nephritis patients, including anti-glomerular basement membrane (anti-GBM) nephritis. When digested with pronase, trypsin, or pepsin, antigenicity of the TBM decreased. We studied the TBM antigens with immunoprecipitation and immunoblotting. After incubation of radio-iodinated CDTBM with anti-TBM sera, immunoprecipitates were identified by single-dimension SDS polyacrylamide gel electrophoresis or two-dimension gel electrophoresis, followed by autoradiography. All four antibodies had identical results on immunoprecipitation; under nonreducing conditions, they gave two protein bands with m.w. of 54,000 and 48,000 and with pI 7.0 to 8.0 and 6.5 to 7.0. Electrophoresis performed under reducing conditions disclosed only one band at the m.w. of 48,000 and pI of 6.5, suggesting that the 54-kDa component is composed of peptides linked by interchain disulfide bonds. Immunoblot analysis showed that the anti-TBM antibodies were heterogeneous; three antibodies from the idiopathic TIN patients reacted with the 54-kDa band, but the one from the renal allograft recipient reacted with neither band. This finding suggests that there are two antigenic determinants on the 54-kDa component. One such determinant that was resistant to denaturation with SDS was detected by the first three antibodies, and the other that was sensitive to such denaturation bound to the last antibody. The 48-kDa component seemed not to be immunoreactive after incubation with SDS. We studied TBM antigens reactive with anti-GBM antibodies. By immunoblotting, all four sera from patients with anti-GBM nephritis stained TBM proteins of 45 to 50 kDa and 25 to 27 kDa at pH 8.0 to 9.0; this was similar to the staining pattern of CDGBM with the same sera, but the highly cationic (pH greater than 9.0) components were specifically detected in the CDGBM. By inhibition ELISA, the binding of the anti-GBM sera to denatured CDTBM decreased with preincubation of the sera with CDGBM, suggesting that the anti-GBM antibodies recognize the same epitope(s) on the GBM and the TBM." @default.
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- W2152667713 date "1986-03-01" @default.
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- W2152667713 title "Characterization of tubular basement membrane antigens in human kidney." @default.
- W2152667713 doi "https://doi.org/10.4049/jimmunol.136.5.1654" @default.
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