PMID- 30944247 OWN - NLM STAT- MEDLINE DCOM- 20200629 LR - 20200629 IS - 2379-3708 (Electronic) IS - 2379-3708 (Linking) VI - 4 IP - 7 DP - 2019 Apr 4 TI - Interleukin-27 promotes CD8+ T cell reconstitution following antibody-mediated lymphoablation. LID - 125489 [pii] LID - 10.1172/jci.insight.125489 [doi] LID - e125489 AB - Antibody-mediated lymphoablation is used in solid organ and stem cell transplantation and autoimmunity. Using murine anti-thymocyte globulin (mATG) in a mouse model of heart transplantation, we previously reported that the homeostatic recovery of CD8+ T cells requires help from depletion-resistant memory CD4+ T cells delivered through CD40-expressing B cells. This study investigated the mechanisms by which B cells mediate CD8+ T cell proliferation in lymphopenic hosts. While CD8+ T cell recovery required MHC class I expression in the host, the reconstitution occurred independently of MHC class I, MHC class II, or CD80/CD86 expression on B cells. mATG lymphoablation upregulated the B cell expression of several cytokine genes, including IL-15 and IL-27, in a CD4-dependent manner. Neither treatment with anti-CD122 mAb nor the use of IL-15Ralpha-/- recipients altered CD8+ T cell recovery after mATG treatment, indicating that IL-15 may be dispensable for T cell proliferation in our model. Instead, IL-27 neutralization or the use of IL-27Ralpha-/- CD8+ T cells inhibited CD8+ T cell proliferation and altered the phenotype and cytokine profile of reconstituted CD8+ T cells. Our findings uncover what we believe is a novel role of IL-27 in lymphopenia-induced CD8+ T cell proliferation and suggest that targeting B cell-derived cytokines may increase the efficacy of lymphoablation and improve transplant outcomes. FAU - Ayasoufi, Katayoun AU - Ayasoufi K FAU - Zwick, Daniel B AU - Zwick DB FAU - Fan, Ran AU - Fan R FAU - Hasgur, Suheyla AU - Hasgur S FAU - Nicosia, Michael AU - Nicosia M FAU - Gorbacheva, Victoria AU - Gorbacheva V FAU - Keslar, Karen S AU - Keslar KS FAU - Min, Booki AU - Min B FAU - Fairchild, Robert L AU - Fairchild RL FAU - Valujskikh, Anna AU - Valujskikh A LA - eng GR - U01 AI063594/AI/NIAID NIH HHS/United States GR - R01 AI113142/AI/NIAID NIH HHS/United States GR - T32 CA217836/CA/NCI NIH HHS/United States GR - R21 AI121524/AI/NIAID NIH HHS/United States GR - R01 AI125247/AI/NIAID NIH HHS/United States PT - Journal Article PT - Research Support, N.I.H., Extramural DEP - 20190404 PL - United States TA - JCI Insight JT - JCI insight JID - 101676073 RN - 0 (Antilymphocyte Serum) RN - 0 (Il27 protein, mouse) RN - 0 (Interleukins) RN - D7RD81HE4W (thymoglobulin) RN - T-Lymphocytopenia SB - IM MH - Adoptive Transfer MH - Animals MH - Antilymphocyte Serum/*administration & dosage MH - B-Lymphocytes/immunology/metabolism MH - Bone Marrow Transplantation MH - CD4-Positive T-Lymphocytes/immunology/transplantation MH - CD8-Positive T-Lymphocytes/*immunology/metabolism MH - Cell Proliferation MH - Disease Models, Animal MH - Female MH - Graft Rejection/*immunology/prevention & control MH - Heart Transplantation/adverse effects MH - Humans MH - Immunologic Memory MH - Interleukins/antagonists & inhibitors/immunology/*metabolism MH - Lymphocyte Depletion/methods MH - Lymphopenia/chemically induced/*immunology MH - Male MH - Mice MH - Mice, Transgenic MH - Transplantation Chimera MH - Up-Regulation/immunology PMC - PMC6483639 OTO - NOTNLM OT - B cells OT - Cytokines OT - Immunology OT - T cells OT - Transplantation COIS- Conflict of interest: The authors have declared that no conflict of interest exists. EDAT- 2019/04/05 06:00 MHDA- 2020/07/01 06:00 PMCR- 2019/04/04 CRDT- 2019/04/05 06:00 PHST- 2018/10/11 00:00 [received] PHST- 2019/02/26 00:00 [accepted] PHST- 2019/04/05 06:00 [entrez] PHST- 2019/04/05 06:00 [pubmed] PHST- 2020/07/01 06:00 [medline] PHST- 2019/04/04 00:00 [pmc-release] AID - 125489 [pii] AID - 10.1172/jci.insight.125489 [doi] PST - epublish SO - JCI Insight. 2019 Apr 4;4(7):e125489. doi: 10.1172/jci.insight.125489. eCollection 2019 Apr 4.