Allogeneic hematopoietic transplantation induces clinically relevant B-cell responses to minor histocompatibility antigens (mHA). In contrast to T cell immunity, it is relatively easy to characterize B-cell responses, antibodies, to specific antigens in large patient cohorts. To test this, we developed ELISA to detect antibody responses against mHA encoded by the Y-chromosome, called H-Y antigens. Our research demonstrates 50% of male transplant patients with female donors (F cGVHD development (p<0.0001). In addition, we found that 30-40% of normal females have low-titer anti-H-Y antibodies, while normal males have essentially none. Our proposed research will determine whether the bone marrow of anti-H-Y antibody positive donors transfers H-Y-specific GVHD and/or GVT immunity to their recipients. The National Marrow Donor Program (NMDP) provided sera from 520 female donors who provided bone marrow grafts for HLA-identical male recipients, their paired clinical information, and follow-up sera sample from the 145 surviving male recipients to directly test if paired female donors and male recipients develop antibodies against shared H-Y peptide epitopes. In this study, we plan to introduce proteomic microarrays to facilitate our investigation of allogeneic antibody responses in human transplantation. HYPOTHESIS: In sex-mismatched transplantation, bone marrow collected from female donors with anti-H-Y antibodies will transfer strong B cell responses specific for H-Y antigens. The clinical outcome of H-Y allogeneic immune responses is correlated to the specificity of anti-H-Y antibody responses and the H-Y protein /antigenic determinants that are targeted in the female donor and male recipient. Technology Aim: Develop H-Y microarray technology to improve detection sensitivity and fine specificity analysis of serum antibodies to H-Y proteins and their overlapping peptides.
Aim 1 Determine the prevalence and specificity of antibody to H-Y antigens in 500 healthy female donors in relation to donor age and parity.
Aim 2 Determine if male patients receiving bone marrow grafts from females with H-Y antibody have different clinical outcomes than males with H-Y sero-negative female donors.
Aim 3 Determine if male patients develop allogeneic antibodies against the same H-Y antigens and peptide epitopes as their female donors. SIGNIFICANCE: The microarray platform multiplexes and increases the sensitivity of allogeneic antibody detection for clinical correlation. Hypothesis validation supports improved HCT donor selection by directly measuring their H-Y antibodies in F Allogeneic antibody develops against H-Y antigen in 50% of male HCT patients with female donors and is strongly associated with chronic GVHD development. Sera from 520 normal female donors will be tested by microarray technology for antibodies against a panel of H-Y proteins and hundreds of composite H-Y peptide epitopes. Female donor H-Y reactivity will be correlated with male recipient clinical outcomes, and male recipient H-Y antibody epitope specificity thereby testing an H-Y B cell adoptive transfer hypothesis. ? ? ?

Agency
National Institute of Health (NIH)
Institute
National Heart, Lung, and Blood Institute (NHLBI)
Type
Exploratory/Developmental Grants (R21)
Project #
5R21HL084318-02
Application #
7407974
Study Section
Transplantation, Tolerance, and Tumor Immunology (TTT)
Program Officer
Wagner, Elizabeth
Project Start
2007-05-01
Project End
2010-04-30
Budget Start
2008-05-01
Budget End
2010-04-30
Support Year
2
Fiscal Year
2008
Total Cost
$237,000
Indirect Cost
Name
Stanford University
Department
Internal Medicine/Medicine
Type
Schools of Medicine
DUNS #
009214214
City
Stanford
State
CA
Country
United States
Zip Code
94305
Nakasone, Hideki; Sahaf, Bita; Tian, Lu et al. (2016) Presensitization to HY antigens in female donors prior to transplant is not associated with male recipient post-transplant HY antibody development nor with clinical outcomes. Haematologica 101:e30-3
Paul, Jed; Sahaf, Bita; Perloff, Spenser et al. (2016) High-throughput allogeneic antibody detection using protein microarrays. J Immunol Methods 432:57-64
Nakasone, Hideki; Tian, Lu; Sahaf, Bita et al. (2015) Allogeneic HY antibodies detected 3 months after female-to-male HCT predict chronic GVHD and nonrelapse mortality in humans. Blood 125:3193-201
Nakasone, Hideki; Sahaf, Bita; Miklos, David B (2015) Therapeutic benefits targeting B-cells in chronic graft-versus-host disease. Int J Hematol 101:438-51
Popli, Rakesh; Sahaf, Bita; Nakasone, Hideki et al. (2014) Clinical impact of H-Y alloimmunity. Immunol Res 58:249-58
Sahaf, Bita; Yang, Yang; Arai, Sally et al. (2013) H-Y antigen-binding B cells develop in male recipients of female hematopoietic cells and associate with chronic graft vs. host disease. Proc Natl Acad Sci U S A 110:3005-10
Wadia, Persis P; Sahaf, Bita; Miklos, David B (2011) Recombinant antigen microarrays for serum/plasma antibody detection. Methods Mol Biol 723:81-104
Tan, Jane C; Wadia, Persis P; Coram, Marc et al. (2008) H-Y antibody development associates with acute rejection in female patients with male kidney transplants. Transplantation 86:75-81