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- W1803439437 abstract "A high affinity monoclonal antibody, 8G2 B9, was used to assess the expression of a 72,000 m.w. glycoprotein ( GP72 ) in isoenzyme-typed T. cruzi strains ( zymodemes ). Western blotting analysis of T. cruzi clones showed that 8G2 B9 bound strongly to GP72 and also suggested that this antigen was absent or weakly detectable in T. cruzi zymodeme 1 (Z1) strains. Purified 8G2 B9 was radiolabeled with 125I and used in an inhibition radioimmune binding assay to compare the quantities of GP72 in different zymodemes . Ninety-six T. cruzi strains were assayed, of which 36 were Z1, 36 were Z2, five were Z3 , and 19 were Z2 (heterozygous). Most (64%) Z1 strains lacked detectable GP72 , whereas this antigen was always detected Z2 and Z2 (heterozygous) strains. There was an 18-fold difference between geometric mean values for the quantities of GP72 (expressed as nanograms per milligram total cell protein) in Z1 and Z2 strains (Z1, 36 ng/mg; Z2, 639 ng/mg; p less than 0.001). There were also significant differences between the geometric mean values for Z2 and Z2 (heterozygous) strains, i.e., 639 ng/mg and 1648 ng/mg, respectively (p less than 0.001). GP72 was detected in four of the Z3 strains in quantities ranging from 740 to 3640 ng/mg. The absolute amounts of antigen in GP72 -positive strains were low, comprising less than 1% of the total cell protein. The specificities of two other anti- GP72 monoclonal antibodies, 7C6 D7 and WIC 29.26, were compared with 8G2 B9. Both antibodies completely inhibited the binding of 8G2 B9 to GP72 in solid phase immunoassays, suggesting that they reacted with the same antigenic determinants. The results show that monoclonal antibody-based assessments of the expression of GP72 correlate with zymodeme classification, and they also suggest that the monoclonal antibodies recognize major antigenic determinants on GP72 . It should be possible to use 8G2 B9 as an immunologic marker to additionally investigate the clinical significance of T. cruzi zymodemes and the biologic significance of GP72 ." @default.
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- W1803439437 date "1984-06-01" @default.
- W1803439437 modified "2023-10-03" @default.
- W1803439437 title "Quantitative differences in the expression of a 72,000 molecular weight cell surface glycoprotein (GP72) in Trypanosoma cruzi zymodemes." @default.
- W1803439437 doi "https://doi.org/10.4049/jimmunol.132.6.3149" @default.
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