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• W1984356056 endingPage "1739" @default.
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• W1984356056 abstract "Human leukocyte antigen (HLA)-DR ligation mediates cell death of antigen-presenting cells (APC), including mature B cells, macrophages, and dendritic cells. This study investigates the apoptotic effects of HLA class II ligation mediated by anti-HLA antibodies on activated human vascular graft endothelial cells (ECs).HLA class II expression was examined by flow cytometry using a panel of HLA-typed vascular ECs isolated from transplant donors and compared with that of B lymphocytes. The apoptotic effects of anti-HLA-DR monoclonal antibodies (mAbs) were investigated using viability assays, DNA content analysis, and annexin-V labeling. Intracellular signaling pathways mediated by HLA-DR ligation on ECs were examined by Western blotting.Even with optimal stimulation, the expression of HLA-DR on interferon (IFN)-gamma-treated ECs was quantitatively lower (3-5-fold) than that on B cells. Whereas anti-HLA-DR monomorphic mAbs induced apoptosis of B cells (approximately 22%), no significant apoptosis of IFN-gamma-activated (DR-positive) ECs ( < 5%), collected from the same donor, was observed under the same conditions. Similarly, specific polymorphic anti-HLA-DR11 or -DR16 antibodies were unable to induce EC apoptosis. Nevertheless, antibody-binding to HLA-DR on ECs is sufficient to induce intracellular signaling, as evident in the modulation of tyrosine phosphorylation and protein kinase (PK)C-alpha/beta and PKB/Akt activation. Our results suggest that HLA-DR ligation induces both common and divergent signaling events in ECs and B cells.Collectively, our data suggest that, in contrast with professional APC, graft ECs evade apoptosis mediated by HLA-DR ligation, not as a result of moderate HLA-DR expression but rather as a result of a specific signaling pathway." @default.
• W1984356056 created "2016-06-24" @default.
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• W1984356056 date "2004-12-01" @default.
• W1984356056 modified "2023-09-23" @default.
• W1984356056 title "Vascular Endothelial Cells Evade Apoptosis Triggered by Human Leukocyte Antigen-DR Ligation Mediated by Allospecific Antibodies" @default.
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• W1984356056 doi "https://doi.org/10.1097/01.tp.0000147339.31581.99" @default.
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