Memory T cell-mediated rejection is mitigated by FcγRIIB expression on CD8+ T cells.

American Journal of Transplantation : Official Journal of the American Society of Transplantation and the American Society of Transplant Surgeons
Anna B MorrisMandy L Ford

Abstract

Donor-reactive memory T cells generated via heterologous immunity represent a potent barrier to long-term graft survival following transplantation because of their increased precursor frequency, rapid effector function, altered trafficking patterns, and reduced reliance on costimulation signals for activation. Thus, the identification of pathways that control memory T cell survival and secondary recall potential may provide new opportunities for therapeutic intervention. Here, we discovered that donor-specific effector/memory CD8+ T cell populations generated via exposure to acute vs latent vs chronic infections contain differential frequencies of CD8+ T cells expressing the inhibitory Fc receptor FcγRIIB. Results indicated that frequencies of FcγRIIB-expressing CD8+ donor-reactive memory T cells inversely correlated with allograft rejection. Furthermore, adoptive T cell transfer of Fcgr2b-/- CD8+ T cells resulted in an accumulation of donor-specific CD8+ memory T cells and enhanced recall responses, indicating that FcγRIIB functions intrinsically to limit T cell CD8+ survival in vivo. Lastly, we show that deletion of FcγRIIB on donor-specific CD8+ memory T cells precipitated costimulation blockade-resistant rejection. These da...Continue Reading

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May 1, 2021·Biomolecules·Emily EsakovMarcia F McInerney
May 5, 2021·Biomedical Materials·Arvind Manikantan PadmaMats Hellström

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