A Human Minor Histocompatibility Antigen Specific for B Cell Acute Lymphoblastic Leukemia
Overview
General Medicine
Authors
Affiliations
Human minor histocompatibility antigens (mHags) play an important role in the induction of cytotoxic T lymphocyte (CTL) reactivity against leukemia after human histocompatibility leukocyte antigen (HLA)-identical allogeneic bone marrow transplantation (BMT). As most mHags are not leukemia specific but are also expressed by normal tissues, antileukemia reactivity is often associated with life-threatening graft-versus-host disease (GVHD). Here, we describe a novel mHag, HB-1, that elicits donor-derived CTL reactivity in a B cell acute lymphoblastic leukemia (B-ALL) patient treated by HLA-matched BMT. We identified the gene encoding the antigenic peptide recognized by HB-1-specific CTLs. Interestingly, expression of the HB-1 gene was only observed in B-ALL cells and Epstein-Barr virus-transformed B cells. The HB-1 gene-encoded peptide EEKRGSLHVW is recognized by the CTL in association with HLA-B44. Further analysis reveals that a polymorphism in the HB-1 gene generates a single amino acid exchange from His to Tyr at position 8 within this peptide. This amino acid substitution is critical for recognition by HB-1-specific CTLs. The restricted expression of the polymorphic HB-1 Ag by B-ALL cells and the ability to generate HB-1-specific CTLs in vitro using peptide-loaded dendritic cells offer novel opportunities to specifically target the immune system against B-ALL without the risk of evoking GVHD.
Rodriguez J, Maquedano M, Cerdan-Velez D, Calvo E, Vazquez J, Tress M bioRxiv. 2024; .
PMID: 39605392 PMC: 11601488. DOI: 10.1101/2024.11.14.623419.
Fuchs K, van de Meent M, Honders M, Khatri I, Kester M, Koster E Blood. 2024; 143(18):1856-1872.
PMID: 38427583 PMC: 11076866. DOI: 10.1182/blood.2023022343.
Verkerk T, Koomen S, Fuchs K, Griffioen M, Spaapen R Proc Natl Acad Sci U S A. 2022; 119(29):e2119736119.
PMID: 35858315 PMC: 9303865. DOI: 10.1073/pnas.2119736119.
The Connection Between Minor H Antigens and Neoantigens and the Missing Link in Their Prediction.
Mutis T, Xagara A, Spaapen R Front Immunol. 2020; 11:1162.
PMID: 32670277 PMC: 7326952. DOI: 10.3389/fimmu.2020.01162.
Minor Histocompatibility Antigen-Specific T Cells.
Summers C, Sheth V, Bleakley M Front Pediatr. 2020; 8:284.
PMID: 32582592 PMC: 7283489. DOI: 10.3389/fped.2020.00284.