丹参酮ⅡA对U251胶质瘤细胞的增殖抑制和原癌基因表达的影响

目的:探讨丹参酮ⅡA对人胶质瘤细胞株U251的增殖抑制作用及其作用机理。方法:应用MTT比色法检测不同浓度丹参酮ⅡA对U251细胞的增殖抑制,应用流式细胞仪观察丹参酮ⅡA对U251细胞周期的影响,应用RT-PCR观察相关基因C-myc表达的变化。结果:丹参酮ⅡA对U251细胞增殖抑制作用呈剂量依赖性,当浓度为0.10 g·L^-1时,对U251细胞增殖的抑制率达到(53.7±6.0)%。流式细胞仪分析显示,用0.10 g·L^-1丹参酮ⅡA培养3 d,细胞周期中G₀/G₁期所占比例增高,S期占细胞周期的比例降低。RT-PCR结果显示,随着丹参酮ⅡA作用剂量的增加,c-myc基因的表达被明显抑制。结论:丹参酮ⅡA对人胶质瘤细胞系U251的增殖具有明显的抑制作用,并对原癌基因c-myc的表达具有抑制作用。

Inhibition of proliferation and influence of proto-oncogenes expression by Tanshinone Ⅱ A in U251 cells

AIM: To investigate the inhibitory effect of Tanshinone ⅡA on U251 glioma cell line and its mechanism. METHODS: MTT was used to measure the levels of the proliferation in U251 cultured with Tanshinone ⅡA at different concentrations. The effects of Tanshinone ⅡA on cell cycle of U251 were observed by FCM. The expression of proto-oncogene c-myc was measured by RT-PCR. RESULTS: The proliferation of U251 was obviously inhibited by Tanshinone ⅡA in a dose dependent manner. The inhibitory rate came to the peak at (54.2±0.9)%, when cultured with Tanshinone ⅡA at 0.10 g/L. The outcome of FCM showed that the proportion of G₀/G₁ phase cells was increased and the proportion of S phase cells was reduced obviously, when cultured with Tanshinone ⅡA at 0.10 g/L for 3 days. The RT-PCR experiment showed that the expression of proto-oncogene c-myc was notably decreased, when the dose of Tanshinone ⅡA was increased. CONCLUSION: Tanshinone ⅡA inhibited the proliferation of U251 and the expression of proto-oncogene c-myc.