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Mathews DV, Dong Y, Higginbotham LB, Kim SC, Breeden CP, Stobert EA, Jenkins J, Tso JY, Larsen CP, Adams AB. CD122 signaling in CD8+ memory T cells drives costimulation-independent rejection. J Clin Invest 2018; 128:4557-4572. [PMID: 30222140 DOI: 10.1172/jci95914] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2017] [Accepted: 07/31/2018] [Indexed: 12/30/2022] Open
Abstract
Interrupting T cell costimulatory signals as a strategy to control undesired immune responses, such as occur in autoimmunity or transplantation, has the potential to alleviate many of the unwanted side effects associated with current immunosuppressive therapies. Belatacept, a high-affinity version of CTLA4-Ig that blocks ligand ligation to CD28, has been approved for use in kidney transplant recipients. Despite the long-term benefits associated with its use, such as improved renal function and lower cardiovascular risk, a subset of patients treated with belatacept experience elevated rates of acute T cell-mediated rejection, tempering enthusiasm for its use. Here we demonstrate that costimulation-independent T cell alloreactivity relies on signaling through CD122, the shared IL-2 and IL-15 receptor β-chain. Combined costimulatory and CD122 blockade improved survival of transplanted tissue in mice and nonhuman primates by controlling proliferation and effector function of CD8+ T cells. The high-affinity IL-2 receptor was dispensable for memory CD8+ T cell responses, whereas signaling through CD122 as a component of the high-affinity IL-15 receptor was critical for costimulation-independent memory CD8+ T cell recall, distinguishing specific roles for IL-2 and IL-15 in T cell activation. These studies outline a novel approach for clinical optimization of costimulatory blockade strategies in transplantation by targeting CD122.
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Affiliation(s)
- David V Mathews
- Emory Transplant Center, Emory University, Atlanta, Georgia, USA
| | - Ying Dong
- Emory Transplant Center, Emory University, Atlanta, Georgia, USA
| | | | - Steven C Kim
- Emory Transplant Center, Emory University, Atlanta, Georgia, USA
| | | | | | | | - J Yun Tso
- JN Biosciences, Mountain View, California, USA
| | - Christian P Larsen
- Emory Transplant Center, Emory University, Atlanta, Georgia, USA.,Yerkes National Primate Center, Atlanta, Georgia, USA
| | - Andrew B Adams
- Emory Transplant Center, Emory University, Atlanta, Georgia, USA.,Yerkes National Primate Center, Atlanta, Georgia, USA
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