Minor histocompatibility antigens (mHA) are peptides derived from normal cellular proteins presented by major histocompatibility complex (MHC) class I and class II molecules. Following allogeneic hematopoietic stem cell transplantation (HSCT), recipient mHA are recognized by donor T cells and become the primary targets of graft-vs-host disease (GVHD). To the extent that mHA are expressed on leukemia cells, these antigens also become important targets of graft-vs-leukemia (GVL) following HSCT. Several well-defined mHA are encoded by genes on the Y chromosome, and CD4+ and CD8+ T cell responses to HY antigens following allogeneic HSCT can mediate GVHD and GVL. Using HY proteins as a model for human mHA, previous laboratory studies in this project demonstrated that male patients engrafted with stem cells from female donors frequently develop antibodies that recognize Y-encoded proteins after transplant. HY antibodies typically develop 4-8 months after transplant and do not occur in patients who receive stem cells from gender-matched donors. HY antibodies persist at high titer for prolonged periods and are significantly associated with the development of chronic GVHD. In studies described in Project 1, these observations led to the evaluation of B cell directed therapy with rituximab for patients with steroid resistant chronic GVHD with promising clinical results. Although these observations suggest that antibodies specific for mHA play a role in chronic GVHD, the mechanisms whereby HY antibodies contribute to tissue damage in affected organs have not been elucidated. To better define the role of B cells and antibodies in the pathogenesis of chronic GVHD, proposed studies in Project 3 will develop new genomic and proteomic approaches to define the spectrum of antibody targets in patients with chronic GVHD and to identify clinically relevant new mHA. Proposed studies will also examine B Cell Activating Factor (BAFF) as a potential biologically relevant marker of chronic GVHD and define the mechanisms whereby B cells and antibodies interact with T cells and contribute to GVHD and GVL following HSCT. There are 4 Specific Aims in Project 3. 1 .Define the spectrum of B cell target antigens in patients with chronic GVHD. 2. Identify novel mHA through genomic comparisons of HLA-identical recipients and donors. 3. Determine whether soluble BAFF levels accurately predict the development of chronic GVHD. 4. Define the mechanisms whereby B cells and antibodies contribute to the development of tissue damage following allogeneic HSCT.

Public Health Relevance

Acute and chronic GVHD result from recognition of recipient cells by donor immune cells after allogeneic HSCT. Although GVHD occurs frequently and leads to substantial toxicity, few specific antigenic targets have been identified. Previous studies in this project demonstrated that both donor B cells and T cells contribute to chronic GVHD. Studies proposed in this project will develop new methods to identify specific targets of donor B and T cells and will determine how these cells cooperate to cause tissue injury.

National Institute of Health (NIH)
National Cancer Institute (NCI)
Research Program Projects (P01)
Project #
Application #
Study Section
Heart, Lung, and Blood Initial Review Group (HLBP)
Project Start
Project End
Budget Start
Budget End
Support Year
Fiscal Year
Total Cost
Indirect Cost
Dana-Farber Cancer Institute
United States
Zip Code
Wu, Yongxia; Schutt, Steven; Paz, Katelyn et al. (2018) MicroRNA-17-92 is required for T-cell and B-cell pathogenicity in chronic graft-versus-host disease in mice. Blood 131:1974-1986
Gartlan, Kate H; Bommiasamy, Hemamalini; Paz, Katelyn et al. (2018) A critical role for donor-derived IL-22 in cutaneous chronic GVHD. Am J Transplant 18:810-820
Hippen, Keli L; Loschi, Michael; Nicholls, Jemma et al. (2018) Effects of MicroRNA on Regulatory T Cells and Implications for Adoptive Cellular Therapy to Ameliorate Graft-versus-Host Disease. Front Immunol 9:57
Koreth, John; Kim, Haesook T; Lange, Paulina B et al. (2018) Bortezomib-based immunosuppression after reduced-intensity conditioning hematopoietic stem cell transplantation: randomized phase II results. Haematologica 103:522-530
Chen, Liying; Alexe, Gabriela; Dharia, Neekesh V et al. (2018) CRISPR-Cas9 screen reveals a MYCN-amplified neuroblastoma dependency on EZH2. J Clin Invest 128:446-462
Kolupaev, Oleg V; Dant, Trisha A; Bommiasamy, Hemamalini et al. (2018) Impaired bone marrow B-cell development in mice with a bronchiolitis obliterans model of cGVHD. Blood Adv 2:2307-2319
Du, Jing; Flynn, Ryan; Paz, Katelyn et al. (2018) Murine chronic graft-versus-host disease proteome profiling discovers CCL15 as a novel biomarker in patients. Blood 131:1743-1754
Zeiser, Robert; Sarantopoulos, Stefanie; Blazar, Bruce R (2018) B-cell targeting in chronic graft-versus-host disease. Blood 131:1399-1405
Blazar, Bruce R; MacDonald, Kelli P A; Hill, Geoffrey R (2018) Immune regulatory cell infusion for graft-versus-host disease prevention and therapy. Blood 131:2651-2660
Lu, Yunjie; Gao, Ji; Zhang, Shaopeng et al. (2018) miR-142-3p regulates autophagy by targeting ATG16L1 in thymic-derived regulatory T cell (tTreg). Cell Death Dis 9:290

Showing the most recent 10 out of 207 publications