牛磺酸对受照射白血病细胞株K562中基质金属蛋白酶-2表达的影响

Effect of taurine on expressions of MMP-2 in K562 leukaemia cell line exposed to γ-rays

目的 探讨γ射线对白血病细胞中基质金属蛋白酶 2 (MMP 2 )表达的影响 ,并从细胞水平初步探讨牛磺酸对肿瘤细胞受辐照后MMP 2表达的抑制作用。方法 加不同剂量牛磺酸的白血病细胞株K5 6 2在6 0 Coγ射线 15Gy照射 12h后收集 ,经凝胶上样缓冲液处理后采用Western blot ting分析各组细胞MMP 2的表达水平。结果 15Gy吸收剂量阳性对照组细胞MMP 2表达量明显增加 ,阴性对照组 1(加药 2 0 0mg L ,不照射 )MMP 2表达量较少 ,加药剂量 5 0mg L组、10 0mg L组、2 0 0mg L组细胞MMP 2表达量依次减少 ,2 0 0mg L组与阴性对照组 1细胞MMP 2表达量基本一致。结论 15Gy6 0 Coγ射线照射促进白血病细胞K5 6 2中MMP 2表达 ;加不同剂量牛磺酸后对MMP 2表达有抑制作用 ,且与剂量呈相关性 ,从而抑制电离辐射引起的肿瘤细胞进一步侵袭和转移 ,达到生物防治的作用。

Objective To study the effect of γ-irradiation on expressions of MMP-2 in leukaemia cells and the suppressive effect of taurine(Tau) on irradiated tumour cells in terms of cellular level. Methods The cells in the control group and Tau (50 mg/L,100 mg/L,200 mg/L)groups were irradiated with 15 Gy γ-rays. The expressions of MMP-2 were examined through Western-blotting after handled with gel-loading buffer within 12 h. Results The expressions of MMP-2 were enhanced evidently in the positive control group, while they were less in the negative control group. In the Tau(50 mg/L,100 mg/L,200 mg/L)groups, the expressions of MMP-2 were diminished in turns, and they were almost identical between the negative control group and the Tau 200 mg/L group. Conclusion Irradiation with γ-rays at a dose of 15 Gy can significantly stimulate the expressions of MMP-2 in K562 cells; Tau can inhibit the expressions of MMP-2 and its effect depends on to its dosage; Tau can inhabit the invasiveness and migration of irradiated tumour cells, so it has the biologic protective and therapeutic effects.