阿糖胞苷诱导HL-60细胞凋亡及其机制研究

为了研究阿糖胞苷诱导HL-60细胞凋亡及其机制，采用Giemsa染色、光学显微镜下观察HL60细胞的形态学变化，琼脂糖凝胶电泳检测DNA凋亡带，细胞免疫组织化学方法检测细胞凋亡相关基因Bcl-2、Bax的蛋白表达。结果显示：实验组自培养8小时起，细胞开始变形，Giemsa染色可见核膜裂解，染色质呈紫红色或蓝紫色，出现典型的凋亡小体；DNA凝胶电泳见典型的梯形条带；在细胞凋亡的同时伴有Bcl-2蛋白表达明显下降，而Bax蛋白表达明显升高，Bcl-2／Bax比值下降。结论：阿糖胞苷可明显地诱导HL60细胞凋亡，同时伴有Bcl乏蛋白表达降低、Bax蛋白升高。Bcl-2／Bax比值下降可能是阿糖胞苷诱导HL-60细胞凋亡的主要机制之一。

Study on Mechanism of Apoptosis of HL-60 Cells Induced by Cytarabine

To study the mechanism of apoptosis of HL-60 cells induced by cytarabine (Ara-C), morphological changes of the HL-60 cells stained with Giemsa were observed by microscopy; the DNA fragments were detected by agarose gel electrophoresis; the expressions of Bcl-2 and bax gene-related apoptosis were investigated by immunohistochemistry. The results showed that HL-60 cells in experimental groups had changed in morphology since they were cultured for 8 hours. HL-60 cells stained with Giemsa showed that their nuclear membranes were splitted. The purplish red chromatins were concentrated into pieces and apoptosis bodies were formed. The apoptosis rate increased in the experimental groups compared with the control group. The expression of Bcl-2 protein was lower and the expression of Bax protein was higher and the ratio of Bcl-2/Bax proteins in the experimental groups was lower than those in the control group. It is concluded that Ara-c can effectively induce apoptosis of HL-60 cells and simultaneously decrease the level of expression of Bcl-2 protein and elevate the level of expression of Bax protein. Decrease of expression ratio of Bcl-2/Bax proteins may be one of the main mechanisms in HL-60 apoptosis induced by Ara-C.