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The Journal of Immunology, 2003, 171: 6510-6518.
Copyright © 2003 by The American Association of Immunologists

The Male Minor Transplantation Antigen Preferentially Activates Recipient CD4+ T Cells through the Indirect Presentation Pathway In Vivo 1

Yifa Chen2, Yilmaz Demir2, Anna Valujskikh and Peter S. Heeger3

Department of Immunology and The Glickman Urologic Institute, The Cleveland Clinic Foundation, Cleveland, OH 44195

To evaluate the priming and trafficking of male Ag-reactive CD4+ T cells in vivo, we developed an adoptive transfer model, using Marilyn (Mar) TCR transgenic T cells that are specific for the H-Y minor transplantation Ag plus I-Ab. By manipulating donor and recipient strain combinations, we permitted the Mar CD4+ T cells to respond to the H-Y Ag after processing and presentation by recipient APCs (indirect pathway), or to the male Ag as expressed on donor APCs (direct pathway). Mar CD4+ T cells responding through the indirect pathway specifically proliferated and expressed activation markers between days 2 and 4 posttransplant, migrated to the graft 2–3 days before cessation of graft heartbeat, and were detected in close proximity to transplant-infiltrating recipient APCs. Intriguingly, adoptively transferred Mar T cells did not respond to male heart or skin grafts placed onto syngeneic MHC class II-deficient female recipients, demonstrating that activation of Mar T cell preferentially occurs through cognate interactions with processed male Ag expressed on recipient APCs. The data highlight the potency of indirect processing and presentation pathways in vivo and underscore the importance of indirectly primed CD4+ T cells as relevant participants in both the priming and effector phases of acute graft rejection.




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