Apoptosis of leukemia cells induced by CD34⁺ cells transferred exogenous Fas ligand

Abstract

To assess the value of CD34⁺ cells transferred exogenous Fas ligand (FasL) in inducing apoptosis of human leukemic cells, the CD34⁺ cells transfected with FasL or without, pretreated with mitomycin C, was mixed with leukemic cell line U937 cells in presence or absence of daunorubicin (DNR) or cytosine arabinoside (Ara-C). After 18 h, apoptosis of cells was detected by FCM and TUNEL. Induced for 18 h by CD34⁺ cells transfected with FasL or without, the ratio of apoptosis of U937 cells was (5.0±1.3)%, (10.8±0.6)% (P<0.01), respectively. Induced by FasL⁺CD34⁺+DNR, FasL⁺CD34⁺+Ara-C, the ratio was (13.4±1.0) % (P<0.05), (17.9±1.3)% (P<0.01), respectively. The result demonstrated that CD34⁺ cells transfected with exogenous FasL could induce apoptosis of human leukemic cells and showed a cytotoxic synergistic effect when used in combination with chemotherapeutic drugs, suggesting that it was possible to develop a new method in treatment of leukemia.

Keywords

Fas ligand / CD34⁺ cells / leukemic cells / apoptosis

References

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