Постоянные области иммуноглобулина в качестве целевых показателей для лечения на основе Т-клекторных рецепторов множественной миеломы.
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Meeuwsen MH, Wouters AK, Wellershoff JC, Wachsmann TLA, Remst DFG, Hagedoorn RS, Kester MGD, van der Steen DM, de Ru AH, van Hees EP, Matsuda M, Ishikawa F, van Veelen PA, Falkenburg JHF, Heemskerk MHM
Аннотация
Оригинал публикации
Immunoglobulin constant domains as targets for T-cell receptor-based treatment of multiple myeloma.
Despite major progress with chimeric antigen receptor (CAR) T-cell therapy, multiple myeloma (MM) remains largely incurable, and most patient relapse. To broaden therapeutic options and overcome antigen escape, we explored T-cell receptor (TCR)-based targeting of intracellular antigens derived from immunoglobulin (Ig) heavy chain constant domains. Using HLA class-I peptidomics, we identified nine IgG- or IgA- derived peptides presented by common HLA alleles (HLA-A*01:01, HLA-A*02:01, HLA-A*03:01, and HLA-B*07:02). High-avidity T-cell clones recognizing four of these epitopes were isolated from HLA-mismatched healthy donors. Transfer of these immunoglobulin-specific TCRs into donor T cells conferred potent and selective recognition of IgG- or IgA-expressing MM cell lines while sparing antigen-negative cells. Safety profiling confirmed strict HLA-restricted specificity without cross-reactivity toward other HLA alleles, non-B-lineage tumor cell lines, or healthy tissues, except for depletion of isotype-matched B cells. Immunoglobulin-TCR T cells efficiently lysed patient-derived MM cells ex vivo and eradicated established IgA- or IgG-expressing MM tumors in murine xenograft models. Mechanistic studies revealed that dendritic cells could cross-present immunoglobulin peptides at high serum concentrations, potentially enhancing T-cell activation in vivo. Importantly, subtype-specific depletion of B cells implies that immunoglobulin-TCR T-cell therapy could partly preserve humoral immunity, reducing the need for antibody replacement compared with pan-B-cell depletion strategies. Collectively, these findings establish immunoglobulin heavy chain constant domains as promising targets for TCR-based cellular immunotherapy in MM and potentially other Ig-producing malignancies or autoantibody-mediated autoimmune diseases.