白血病细胞核因子-κB活化与化疗药物诱导凋亡的关系

目的 研究化疗药物诱导P388白病细胞核因子-κB(NF-κB)活化与凋亡的关系,以及长春新碱(VCR)对它们的影响。方法 采用电泳迁移率变动分析(EMSA)检测细胞NF-κB活化水平;采用TdF介导的dUTF缺口末端标记技术(TUNEL)和DNA电泳方法检测细胞凋亡。结果 化疗药物诱导P388白血病细胞NF-κB活化与化疗药物诱导细胞凋亡有明显关系,0．1μmol／L VCR不仅能显著抑制100μmol／L阿糖胞苷(Ara-C)或100μmol／L鬼臼乙叉甙(Vp-16)诱导的P388细胞NF-κB活化(抑制率分别为52％和63％),而且增强它们诱导P388细胞凋亡的作用(凋亡增加率分别为89%和123%)。P388细胞在接触化疗药物前,NF-κB亦有一定程度的活化。结论 化疗药物诱导P388白血病细胞凋亡的同时,可活化NF-κB;VCR可通过抑制NF-κB活化,增强化疗药物诱导白血病细胞凋亡的作用。

Relation between activation of NF-kappa B and chemotherapy induced apoptosis of leukemic cells

OBJECTIVE: To analyze the relation between activation of NF-kappa B and chemotherapy induced apoptosis of leukemic cells and the effect of vincristine (VCR) on them. METHODS: Electrophoretic mobility shift assay (EMSA) was used to detect the activation of NF-kappa B and tunel DNA electrophoresis was adopted to observe the apoptosis induced by cytosine arabinoside (Ara-C) and etopside (Vp-16) in P388 leukemic cells. RESULTS: The activation of NF-kappa B induced by Ara-C and Vp-16 was obviously correlated to apoptosis in P388 cells. VCR (0.1 micromol/L) could suppress activation of NF-kappa B by 52% and 63% and significantly increase the apoptosis by 89% and 123% as induced by Ara-C (100 micromol/L) and Vp-16 (100 micromol/L). The activity of NF-kappa B could be found in P388 cells before being exposed to chemotherapeutic agent. CONCLUSION: Chemotherapeutic agents can induce apoptosis and activation of NF-kappa B of P388 cells. The mechanism of VCR potentiating chemotherapeutics induction of leukemia cell apoptosis may be related to its suppression of the NF-kappa B activity in the P388 cells.