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Chronic Lymphocytic Leukemia

Development of CLL in the TCL1 transgenic mouse model is associated with severe skewing of the T-cell compartment homologous to human CLL

Abstract

Chronic lymphocytic leukemia (CLL) cells require complex microenvironmental and immunologic interactions to survive and proliferate. Such interactions might be best recreated in animal models; however, this needs extensive verification. We therefore investigated the composition of the T-cell compartment in the Eμ-TCL1 transgenic mouse, currently the most widely used murine model for CLL. Immunophenotyping and transplant approaches were used to define T-cell subsets at various stages of CLL. Analogous to human CLL, we observed a skewing of T-cell subsets from naive to antigen-experienced memory T cells that was more pronounced in lymph nodes than in blood. Transplantation of CLL into non-transgenic recipients was feasible without immunosuppression in a pure C57BL/6 background and resulted in the prominent skewing of the T cells of the recipient mice. Both in spontaneously developed CLL and in the transplantation setting, a loss in T-cell receptor diversity was observed, with a relevant number of clonal T-cell populations arising. This suggests that antigen-dependent differentiation toward the T memory pool is initiated by murine CLL cells. In summary, we validate the TCL1 transgenic mouse model for analysis of T-cell phenotypes and suggest a CLL-dependent antigen-driven skewing of T cells in these mice.

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Acknowledgements

This work was supported by Austrian FWF Grants P19481 and L488 to AE, Austrian National Bank Grant 10990 to AE and by the state of Salzburg and the SFB 021 to RG. TCR CDR3 spectratyping was performed at the Children's Hospital of the Federal Hospital of Salzburg.

Author contributions AE, JPH, IT and RG designed the research; JPH, ChH, UD, TK, ClH, DT and DA performed the experimental work; AE and JPH performed the analysis; AE and JPH wrote the paper. All authors were involved in critical discussion of the manuscript.

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Correspondence to A Egle.

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Hofbauer, J., Heyder, C., Denk, U. et al. Development of CLL in the TCL1 transgenic mouse model is associated with severe skewing of the T-cell compartment homologous to human CLL. Leukemia 25, 1452–1458 (2011). https://doi.org/10.1038/leu.2011.111

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