足叶乙甙诱导HL-60细胞凋亡过程中电化学行为的研究

目的研究药物诱导白血病细胞凋亡中的电化学变化及其意义。方法使用电化学传感器检测经足叶乙甙（Ｖｐ１６）诱导的ＨＬ６０细胞凋亡。结果２～２００μｇ／ｍｌＶｐ１６作用于ＨＬ６０细胞２４小时的过程中，随着药物剂量的增大，细胞峰值电流逐渐降低，Ｖｐ１６２μｇ／ｍｌ时即可观察到细胞电化学活性较对照组下降，２０μｇ／ｍｌ时明显下降。以Ｖｐ１６２００μｇ／ｍｌ诱导细胞凋亡，通过ＤＮＡ含量分析显示在２，３，４小时细胞凋亡率为１０．５％～２０．０％，用电化学传感器方法检测细胞电化学活性改变差异明显，峰值电流从１．８μＡ降至０４μＡ，４小时时峰值电流降至用药前的１／５。结论在细胞凋亡早期启动阶段的电化学信号改变具有一定的早期意义和蓄积性。

Study on electrochemical behavior of HL 60 cells during the etoposide inducing apoptosis

OBJECTIVE: To study the electrochemical behavior of apoptotic HL-60 cells induced with etoposide. METHODS: Electrochemical cytosensor was used to monitor HL-60 cells treated with etoposide. RESULTS: The peak current and electron transfer rate decreased as etoposide dosage increased. The decrease appeared at 2 micrograms/ml etoposide treatment and was remarkable at 20 micrograms/ml, which occurred before the typical changes of cell morphology and DNA contents for apoptosis. FCM-DNA analysis showed that the apoptotic cells were of 10.5%-20% while the peak current decreased from 1.8 microA to 0.4 microA after 2.3 and 4 hours treatment with 200 micrograms/ml etoposide, and the peak current after 4 hours treatment was 5 times lower than that before induction. CONCLUSION: The changes of electrochemical behavior during the early stage of apoptosis occurred earlier and could be accumulated.