Kidney transplantation's considerable benefit is offset by the infectious and metabolic morbidity related to its required immunosuppressive drugs. Recently, belatacept, a CD28-B7 costimulation pathway inhibitor, has been approved for use with substantial evidence suggesting that it can prevent kidney rejection with less morbidity, and perhaps serve as a centerpiece agent for tolerance regimens. However, although belatacept appears to control naive immune responses well and evoke few off-target side effects, its control of memory T cell (TM) responses is less robust than hoped and its use is associated with significant morbidity related to the Epstein-Barr Virus (EBV). This Project will leverage substantial investigator experience and extensive preliminary data to develop logical adjuvant therapies that can be paired with belatacept. In particular, it will study altered integrin adhesion molecule expression as a means of identifying TMS with potential to cause belatacept-resistant rejection, and test four novel biologic agents for their ability to improve belatacept's antirejection effect in a rhesus monkey model of kidney transplantation without evoking the side effects related to existing standard immunosuppressive drugs. The ultimate goal is to develop one or more translatable regimens that can mediate lasting, well-tolerated, antigen-specific immune modulation to prevent allograft rejection. There are 3 Specific Aims. 1) To determine the effects of leukocyte function antigen (LFA)-Idirected therapy as an adjuvant to belatacept-based maintenance immunosuppression. We will test two novel LFA-1-specific monoclonal antibodies (Mabs) with identical specificity but distinct isotype, loGI or lgG4, for their efficacy in preventing belatacept-resistant rejection, and assess their effect on protective immunity, particularly toward the EBV-homologue, lymphocryptovirus (LCV). 2) To determine the role of an activation-induced LFA-1 conformational modification in mediating rejection and test the novel conformation specific, anti-LFA-1 Mab, AL-57. as an adjuvant to belatacept. We will define the AL-57 epitope in rhesus alio- and viral-specific immunity and test AL-57 for its ability to prevent or reverse rejection. 3) To define the effects of very late antigen (VLA)-4-specific therapy as an adjuvant to belatacept. We will test the VLA-4- specific Mab natalizumab for its efficacy in preventing or reversing belatacept-resistant rejection, and assess its effect on protective immunity. From these studies we will examine new approaches toward immunosuppression, using translatable agents in a clinically relevant pre-clinical model while concurrently providing new insights into the role of integrins in viral- and allo-immunity.
Organ transplantation is the preferred therapy for most forms of end-stage kidney, heart and liver failure, but its practice remains imperfect. This project will develop improved methods for delivering transplant related therapy, and in doing so, provide new opportunities to provide transplant-based therapies for patients with end organ failure. The project will investigate agents that cold be readily translated into clinical therapies and thus provide needed pre-clinical data in support of required clinical trials.
|Mathews, David V; Dong, Ying; Higginbotham, Laura B et al. (2018) CD122 signaling in CD8+ memory T cells drives costimulation-independent rejection. J Clin Invest 128:4557-4572|
|Kean, Leslie S (2018) Defining success with cellular therapeutics: the current landscape for clinical end point and toxicity analysis. Blood 131:2630-2639|
|Colonna, Lucrezia; Peterson, Christopher W; Schell, John B et al. (2018) Evidence for persistence of the SHIV reservoir early after MHC haploidentical hematopoietic stem cell transplantation. Nat Commun 9:4438|
|Song, M; Mulvihill, M S; Williams, K D et al. (2018) Fatal SV40-associated pneumonia and nephropathy following renal allotransplantation in rhesus macaque. J Med Primatol 47:81-84|
|Taraseviciute, Agne; Tkachev, Victor; Ponce, Rafael et al. (2018) Chimeric Antigen Receptor T Cell-Mediated Neurotoxicity in Nonhuman Primates. Cancer Discov 8:750-763|
|Ezekian, Brian; Schroder, Paul M; Freischlag, Kyle et al. (2018) Contemporary Strategies and Barriers to Transplantation Tolerance. Transplantation 102:1213-1222|
|Kwun, Jean; Manook, Miriam; Page, Eugenia et al. (2017) Crosstalk Between T and B Cells in the Germinal Center After Transplantation. Transplantation 101:704-712|
|Mathews, D V; Wakwe, W C; Kim, S C et al. (2017) Belatacept-Resistant Rejection Is Associated With CD28+ Memory CD8 T Cells. Am J Transplant 17:2285-2299|
|Manook, M; Kwun, J; Burghuber, C et al. (2017) Thrombalexin: Use of a Cytotopic Anticoagulant to Reduce Thrombotic Microangiopathy in a Highly Sensitized Model of Kidney Transplantation. Am J Transplant 17:2055-2064|
|Samy, K P; Anderson, D J; Lo, D J et al. (2017) Selective Targeting of High-Affinity LFA-1 Does Not Augment Costimulation Blockade in a Nonhuman Primate Renal Transplantation Model. Am J Transplant 17:1193-1203|
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