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- W1532778742 abstract "While matching for MHC Ags improves renal allograft survival, closely matched grafts sometimes fail due to rejection, and poorly matched allografts are often well tolerated by the recipient. The severity of the rejection process may partially depend on the presence of environmentally primed T cells in the recipient that cross-react with donor Ags. To test for the presence of primed, donor-specific T cells in humans before transplantation, we used an enzyme-linked immunospot assay for detection of allospecific cytokines produced by individual human PBLs. We demonstrate that this approach detects cytokine production at single cell resolution and detects production of IFN-gamma only when there is defined immunologic priming, thus representing a measure of primed donor-specific immunity. Because the environmental Ag exposure of the recipient is not a function of the HLA mismatch between donor and potential recipient, the number of HLA mismatches may not correlate with the frequency of pretransplant, donor-specific IFN-gamma-producing PBLs. Studies of donor-specific IFN-gamma-producing lymphocytes in a cohort of patients being evaluated for renal transplantation corroborated this hypothesis. Moreover, for recipients of both living and cadaver renal allografts, the pretransplant frequency of donor-specific memory cells correlated with the posttransplant risk of developing acute rejection episodes. This improved ability to define the strength of the allospecific immune response by enzyme-linked immunospot assay may allow improved pairing of recipients with donors and identification of kidney allograft donor-recipient pairs at high risk for acute rejection, thus permitting targeted interventions aimed at prolonging graft survival." @default.
- W1532778742 created "2016-06-24" @default.
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- W1532778742 date "1999-08-15" @default.
- W1532778742 modified "2023-10-14" @default.
- W1532778742 title "Pretransplant frequency of donor-specific, IFN-gamma-producing lymphocytes is a manifestation of immunologic memory and correlates with the risk of posttransplant rejection episodes." @default.
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