Transgenic HA-1-Specific CD8+ T-Lymphocytes Selectively Target Leukemic Cells.

Abstract

A significant share of allogeneic hematopoietic stem cell transplantations (allo-HSCT) results in the relapse of malignant disease. The T cell immune response to minor histocompatibility antigens (MiHAs) promotes a favorable graft-versus-leukemia response. The immunogenic MiHA HA-1 is a promising target for leukemia immunotherapy, as it is predominantly expressed in hematopoietic tissues and presented by the common HLA A*02:01 allele. Adoptive transfer of HA-1-specific modified CD8+ T cells could complement allo-HSCT from HA-1- donors to HA-1+ recipients. Using bioinformatic analysis and a reporter T cell line, we discovered 13 T cell receptors (TCRs) specific for HA-1. Their affinities were measured by the response of the TCR-transduced reporter cell lines to HA-1+ cells. The studied TCRs showed no cross-reactivity to the panel of donor peripheral mononuclear blood cells with 28 common HLA alleles. CD8+ T cells after endogenous TCR knock out and introduction of transgenic HA-1-specific TCR were able to lyse hematopoietic cells from HA-1+ patients with acute myeloid, T-, and B-cell lymphocytic leukemia (n = 15). No cytotoxic effect was observed on cells from HA-1- or HLA-A*02-negative donors (n = 10). The results support the use of HA-1 as a target for post-transplant T cell therapy.

• Authors: Artem Pilunov, Dmitrii S Romaniuk, Anton Shmelev, Savely Sheetikov, Anna N Gabashvili, Alexandra Khmelevskaya, Dmitry Dianov, Ksenia Zornikova, Naina T Shakirova, Murad Vagida, Apollinariya Bogolyubova, Grigory A Efimov
• Journal: Cancers (Cancers (Basel)) Vol. 15 Issue 5 (Mar 03 2023) ISSN: 2072-6694 [Print] Switzerland
• PMID: 36900382 (Publication Type: Journal Article)