CD4+ T CELLS TUMOR SPECIFIC RESPONSE EXISTS IN L615 LEUKEMIA MICE: ADOPTIVE TRANSFER IN COMBINATION WITH CYCLOPHOSPHAMIDE

Zhang Sheng, Zhang Hong-Jun, Wang Hong-Yi, Wang Qin, Wen-Feng Li, Li Yu

Aim: L615 leukemia cell line is a transplantable acute lymphocytic leukemia model with the CD4 positive phenotype. In this study, we explored whether tumor response specific T cells can be separated from the live leukemia mice or not. Methods: The mutant HGPRT- L615 cell line was first established. The splenocytes from HGPRT- L615 leukemia mice were cultured and expanded in mixed tumor-lymphocytes culture manner. The expanded T cells were sorted with FACScan. Then their killing capacity, IFN-g release as well as antitumor capacity in adoptive transfer experiments were analyzed. Results: The expanded response T cells are mostly CD4 positive. The CD4 positive T cells showed high release of IFN-g upon stimulation but lacked significant cytotoxicity. In immunochemotherapy model, these CD4 positive T cells can cure most leukemia mice. Conclusions: We demonstrated the feasibility of separation of tumor response specific CD4+ T cells from CD4+ L615 leukemia mice. These CD4+ T cells can cure leukemia mice upon adoptive transfer in combination with cyclophosphamide pretreatment.

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