Hematopoietic cell transplantation (HCT) offers great promise for the treatment of a variety of malignant and non-malignant hematopoietic diseases, but graft-versus-host disease (GVHD) remains the major obstacle for success of HCT as it leads to high incidence of morbidity and mortality. Donor T cells that are included in the stem cell inoculum and recognize recipient alloantigens are the major cause of GVHD. When used as immunotherapy for hematopoietic malignances (e.g. leukemia), the therapeutic potential of allogeneic HCT relies on the graft-versus-leukemia (GVL) effect to eradicate residual tumor cells through immunologic mechanisms. T cell is a multi-potential precursor with defined antigen recognition specificity but substantial plasticity for differentiation into distinct lineages according to the signals encountered. Naive T helper cells (Th) can differentiate into four different subsets: Th1, Th2, Th17 and T regulatory cells, but the contributions of these activated T cell subsets to GVHD development and GVL effect remains unclear. Lacking the knowledge precludes us from selectively targeting the pathogenic subset or its associated cytokines for controlling GVHD while maintaining GVL effect. The goal of this project is to understand the contribution of Th1/Th17 differentiation, the cytokines that induce T-cell differentiation, and the cytokines produced by Th1/Th17 cells to GVHD development and GVL activity. The central hypothesis is that both the Th1 and Th17 subsets contribute to GVHD development but either lineage alone is sufficient to induce GVHD, and thus both lineages must to be blocked in order to control GVHD. This proposal will systematically and stringently addresses the contribution of Th1 and Th17 differentiation in GVHD by targeting lineage-specific transcription factor(s) for proof-of-concept (Aim 1). In parallel, more translational studies will be conducted to understand the role of Th17 priming and effector cytokine in GVHD and the reciprocal regulation of Th1/Th17 lineages in alloresponse in vivo (Aim 2). Because allogeneic HCT is primarily utilized to treat hematopoietic malignances, it is critically important to evaluate the contribution of different subset of T cells to GVL effect. We will evaluate the role of Th1/Th17 subsets in GVL effect along with GVHD development by using MHC-mismatched and -matched BMT models with leukemia or lymphoma. Furthermore, clinically applicable interventions will be used to block Th1/Th17 differentiation in these studies (Aim 3). The information learned from this research project will provide the rationale and means to regulate T-cell differentiation toward our ultimate goal of preventing GVHD while sparing GVL activity.

Public Health Relevance

Hematopoietic cell transplantation (HCT) offers great promise for the treatment of a variety of diseases, including cancer. However, this therapeutic procedure has a major complication, termed graft-versus-host disease (GVHD), which is induced by donor T cells that recognize disparate antigens and cause tissue injuries in the recipient. Donor T cells, on the other hand, can also bring beneficial effects to the patient, including anti- tumor and anti-infection. In the current research, we will study how donor T cells respond to antigens in recipient normal tissues and in tumor cells. Results may provide the rationale and means to regulate T-cell activation toward our ultimate goal of preventing GVHD while sparing those beneficial effects mediated by donor T cells.

National Institute of Health (NIH)
National Cancer Institute (NCI)
Research Project (R01)
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Cancer Immunopathology and Immunotherapy Study Section (CII)
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Mccarthy, Susan A
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Medical University of South Carolina
Schools of Medicine
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Betts, Brian C; Bastian, David; Iamsawat, Supinya et al. (2018) Targeting JAK2 reduces GVHD and xenograft rejection through regulation of T cell differentiation. Proc Natl Acad Sci U S A 115:1582-1587
Heinrichs, Jessica; Bastian, David; Veerapathran, Anandharaman et al. (2016) Regulatory T-Cell Therapy for Graft-versus-host Disease. J Immunol Res Ther 1:1-14
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Wu, Yongxia; Heinrichs, Jessica; Bastian, David et al. (2015) MicroRNA-17-92 controls T-cell responses in graft-versus-host disease and leukemia relapse in mice. Blood 126:1314-23
Li, Jun; Heinrichs, Jessica; Haarberg, Kelley et al. (2015) HY-Specific Induced Regulatory T Cells Display High Specificity and Efficacy in the Prevention of Acute Graft-versus-Host Disease. J Immunol 195:717-25
Schutt, Steven D; Fu, Jianing; Nguyen, Hung et al. (2015) Inhibition of BTK and ITK with Ibrutinib Is Effective in the Prevention of Chronic Graft-versus-Host Disease in Mice. PLoS One 10:e0137641
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Wu, Yongxia; Bastian, David; Schutt, Steven et al. (2015) Essential Role of Interleukin-12/23p40 in the Development of Graft-versus-Host Disease in Mice. Biol Blood Marrow Transplant 21:1195-204
Fu, Jianing; Heinrichs, Jessica; Yu, Xue-Zhong (2014) Helper T-cell differentiation in graft-versus-host disease after allogeneic hematopoietic stem cell transplantation. Arch Immunol Ther Exp (Warsz) 62:277-301
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