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1,25(OH)2D3对人白血病6T—CEM细胞株凋亡及VDR蛋白表达的影响

2017-07-31古丽巴哈·买买提刘玉

中国医药导报 2017年18期
关键词:研究

古丽巴哈·买买提++++++刘玉++++++赵莉++++++严媚

[摘要] 目的 探讨1,25-二羟维生素D3[1,25(OH)2D3]对人白血病6T-CEM细胞株凋亡及维生素D受体(VDR)蛋白表达的影响。 方法 培养6T-CEM细胞株,采用随机数字表法将其分为A、B、C、D四组,A、B、C组分别加入浓度为10-6、10-7、10-8 mol/L的1,25(OH)2D3,D组加入DMSO。采用MTT法检测各组吸光度A值和细胞增殖抑制率情况,AO-EB荧光染色观察各组细胞形态,流式细胞仪检测各组细胞凋亡情况,RT-PCR和Western blot法检测VDR mRNA和蛋白表达。 结果 A组吸光度A值明显低于B、C组和D组(P < 0.05);A、B、C三组的细胞增殖抑制率从高到低依次排序为A>B>C;D组CEM细胞凋亡指数明显低于A、B、C组(P < 0.05);A组凋亡指数明显高于其他三组(P < 0.05);各组VDR mRNA表达差异无统计学意义(P > 0.05);A组VDR蛋白表达明显高于其他三组(P < 0.05)。 结论 1,25(OH)2D3能有效抑制6T-CEM细胞增殖,诱导其凋亡,上调VDR蛋白表达。

[关键词] 白血病;6T-CEM细胞株;1,25-二羟维生素D3;维生素D受体

[中图分类号] R733.7 [文献标识码] A [文章编号] 1673-7210(2017)06(c)-0012-04

[Abstract] Objective To investigate the effect of 1, 25-dihydroxyvitamin D3 [1, 25 (OH)2D3] on apoptosis of 6T-CEM cell lines and expression of vitamin D receptor (VDR) protein human leukemia. Methods The 6T-CEM cell lines were cultured and randomly divided into group A, B, C, D. Group A, B, C were added with 1, 25 (OH)2D3 with the concentration of 10-6, 10-7, 10-8 mol/L respectively, and group D was added with DMSO. The absorbance A value and cell proliferation inhibition rate were detected by MTT method, the cell morphology was observed by AO-EB fluorescence staining, and the cell apoptosis was detected by flow cytometer, the expression of VDR mRNA and protein were detected by RT-PCR and Western blot method. Results The absorbance of group A was apparently lower than that of group B, C and D (P < 0.05); the inhibitory rate of cell proliferation of group A, B, C was A>B>C; the CEM cell apoptosis index of group D was apparently lower than that of group A, B and C (P < 0.05); the apoptosis index of group A was apparently higher than other three groups (P < 0.05); there was no statistically significant difference in VDR mRNA expression among the four groups (P > 0.05). The VDR protein expression of group A was apparently higher than that of other three groups (P < 0.05). Conclusion 1, 25 (OH)2D3 can effectively inhibit the proliferation of 6T-CEM cells, induce its apoptosis, up-regulate the VDR protein expression.

[Key words] Leukemia; 6T-CEM cell lines; 1, 25-dihydroxyvitamin D3; Vitamin D receptor

白血病是一種恶性的造血干细胞克隆性疾病,也是目前最为常见和最具威胁的血液系统疾病[1-2]。该病的发病机制较为复杂,一般认为与多个基因的调控异常有关[3]。目前临床上多采用基因靶向药物治疗慢性粒细胞白血病,虽然取得了一定的效果,但其分子靶点具有一定的局限性,对一些急变期慢性粒细胞白血病患者的治疗效果较差[4-5]。1,25-二羟维生素D3[1,25(OH)2D3]是维生素D在机体中主要的活性产物,不但具有调节钙磷代谢平衡的作用,还能诱导肿瘤细胞分化并抑制肿瘤细胞增殖,其目前是肿瘤研究的热点之一[6-7]。本研究选取人白血病6T-CEM细胞株作为研究对象,探讨分析了1,25(OH)2D3对人白血病6T-CEM细胞株凋亡及维生素D受体(VDR)蛋白表达的影响,为临床上寻找更好的分子靶点治疗白血病提供了理论依据。

1 材料与方法

1.1 细胞培养

人急性T淋巴细胞白血病细胞株6T-CEM由中国科学院上海生命科学研究所提供,置于-80℃冰箱中保存。培……

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