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• W2092626014 abstract "Chronic rejection of mouse kidney allografts.BackgroundChronic renal allograft rejection is the leading cause of late graft failure. However, its pathogenesis has not been defined.MethodsTo explore the pathogenesis of chronic rejection, we studied a mouse model of kidney transplantation and examined the effects of altering the expression of donor major histocompatibility complex (MHC) antigens on the development of chronic rejection.ResultsWe found that long-surviving mouse kidney allografts develop pathological abnormalities that resemble chronic rejection in humans. Furthermore, the absence of MHC class I or class II antigens did not prevent the loss of graft function nor alter the pathological characteristics of chronic rejection. Expression of transforming growth factor-β (TGF-β), a pleiotropic cytokine suggested to play a role in chronic rejection, was markedly enhanced in control allografts compared with isografts. However, TGF-β up-regulation was significantly blunted in MHC-deficient grafts. Nonetheless, these differences in TGF-β expression did not affect the character of chronic rejection, including intrarenal accumulation of collagens.ConclusionsReduced expression of either class I or II direct allorecognition pathways is insufficient to prevent the development of chronic rejection, despite a reduction in the levels of TGF-β expressed in the allograft. This suggests that the severity of chronic rejection is independent of the level of MHC disparity between donor and recipient and the level of TGF-β expression within the allograft. Chronic rejection of mouse kidney allografts. Chronic renal allograft rejection is the leading cause of late graft failure. However, its pathogenesis has not been defined. To explore the pathogenesis of chronic rejection, we studied a mouse model of kidney transplantation and examined the effects of altering the expression of donor major histocompatibility complex (MHC) antigens on the development of chronic rejection. We found that long-surviving mouse kidney allografts develop pathological abnormalities that resemble chronic rejection in humans. Furthermore, the absence of MHC class I or class II antigens did not prevent the loss of graft function nor alter the pathological characteristics of chronic rejection. Expression of transforming growth factor-β (TGF-β), a pleiotropic cytokine suggested to play a role in chronic rejection, was markedly enhanced in control allografts compared with isografts. However, TGF-β up-regulation was significantly blunted in MHC-deficient grafts. Nonetheless, these differences in TGF-β expression did not affect the character of chronic rejection, including intrarenal accumulation of collagens. Reduced expression of either class I or II direct allorecognition pathways is insufficient to prevent the development of chronic rejection, despite a reduction in the levels of TGF-β expressed in the allograft. This suggests that the severity of chronic rejection is independent of the level of MHC disparity between donor and recipient and the level of TGF-β expression within the allograft." @default.
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• W2092626014 date "1999-05-01" @default.
• W2092626014 modified "2023-09-27" @default.
• W2092626014 title "Chronic rejection of mouse kidney allografts" @default.
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• W2092626014 doi "https://doi.org/10.1046/j.1523-1755.1999.00423.x" @default.
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