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Weigand, L.U.* ; Liang, X.* ; Schmied, S.* ; Mall, S.* ; Klar, R.* ; Stötzer, O.J.* ; Salat, C.* ; Götze, K.* ; Mautner, J. ; Peschel, C.* ; Krackhardt, A.M.

Isolation of human MHC class II-restricted T cell receptors from the autologous T-cell repertoire with potent anti-leukaemic reactivity.

Immunology 137, 226-238 (2012)

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Adoptive transfer of T cells genetically modified with tumour-specific T-cell receptors (TCR) is a promising novel approach in the treatment of cancer. We have previously isolated an allorestricted MHC class I-restricted TCR with specificity for Formin-like protein 1 (FMNL1) with potent activity against chronic lymphocytic leukaemia cells. CD4(+) T cells have been described to be highly important for tumour elimination although TCR derived from CD4(+) T cells with anti-tumour reactivity have been only rarely described. In this study we aimed to isolate MHC class-II-restricted CD4(+) T cells and TCR with specificity for leukaemia antigens. We used professional antigen-presenting cells pulsed with the leukaemia-associated and tumour-associated antigen FMNL1 for stimulation of autologous T cells in vitro. We isolated two CD4(+) HLA-DR-restricted T-cell clones and T-cell-derived TCR with so far unknown specificity but high reactivity against lymphoma cells and native malignant cells derived from HLA-matched patients with diverse leukaemias. Moreover, characterization of the TCR after TCR gene transfer revealed that specific characteristics of isolated TCR as reactivity in response to Toll-like receptors were transferable on effector cells. Our results have a major impact on the development of novel immunotherapies. They demonstrate that TCR with potent HLA-DR-restricted anti-leukaemic reactivity against so far undefined self-restricted antigens can be isolated from the healthy autorestricted CD4(+) T-cell repertoire and these TCR are highly interesting candidate tools for novel immunotherapies.

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