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- W2081169747 abstract "Abstract The K blood group remains an important target in hemolytic disease of the newborn (HDN), with no immune prophylaxis available. The aim was to characterize the Th response to K as a key step in designing specific immunotherapy and understanding the immunogenicity of the Ag. PBMCs from K-negative women who had anti-K Abs after incompatible pregnancy, and PBMCs from unimmunized controls, were screened for proliferative responses to peptide panels spanning the K or k single amino acid polymorphism. A dominant K peptide with the polymorphism at the C terminus elicited proliferation in 90% of alloimmunized women, and it was confirmed that responding cells expressed helper CD3+CD4+ and “memory” CD45RO+ phenotypes, and were MHC class II restricted. A relatively high prevalence of background peptide responses independent of alloimmunization may contribute to K immunogenicity. First, cross-reactive environmental Ag(s) pre-prime Kell-reactive Th cells, and, second, the K substitution disrupts an N-glycosylation motif, allowing the exposed amino acid chain to stimulate a Th repertoire that is unconstrained by self-tolerance in K-negative individuals. The dominant K peptide was effective in inducing linked suppression in HLA-transgenic mice and can now be taken forward for immunotherapy to prevent HDN because of anti-K responses." @default.
- W2081169747 created "2016-06-24" @default.
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- W2081169747 date "2012-06-07" @default.
- W2081169747 modified "2023-09-29" @default.
- W2081169747 title "Identification, immunomodulatory activity, and immunogenicity of the major helper T-cell epitope on the K blood group antigen" @default.
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- W2081169747 doi "https://doi.org/10.1182/blood-2012-02-410324" @default.
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