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β-榄香烯对膀胱癌T24细胞增殖及MTA-1基因表达的影响
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摘要
目的:研究β-榄香烯对膀胱癌T24细胞增殖及其对MTA-1基因表达的影响,探讨β-榄香烯诱导膀胱癌细胞凋亡及其可能机制,为进一步研究β-榄香烯的抗癌作用和临床应用β-榄香烯提供实验依据。
     方法:体外培养T24细胞,以浓度分别为0.004mg/ml、0.008mg/ml、0.01mg/ml、0.02mg/ml、0.04mg/ml、0.06mg/ml、0.08mg/ml的β-榄香烯分别作用T24细胞24h、48h和72h,应用MTT方法测定各组β-榄香烯对膀胱癌T24细胞增殖的抑制作用;运用IC50软件计算出高于IC50所用的最低浓度β-榄香烯,以此浓度的β-榄香烯作用T24细胞24h、48h、72h,分别运用Western-blot、RT-PCR法检测对MTA-1蛋白和MTA-1mRNA表达水平的影响;应用光镜观察各组膀胱癌细胞形态学的改变。并设置浓度为0mg/mlβ-榄香烯作为对照组。
     结果: MTT比色法结果显示:对T24细胞的抑制率在50﹪以上的最低浓度β-榄香烯为0.02mg/ml;其它各处理组不同浓度的β-榄香烯均能抑制T24细胞生长,并且T24细胞的成活率随β-榄香烯的浓度增加和作用时间的延长而降低,存在剂量和作用时间依赖性。以0.02mg/ml浓度β-榄香烯作用T24细胞24h、48h和72h, Western-blot检测各组MTA-1蛋白表达相对值分别是(0.845±0.014),(0.667±0.016),(0.478±0.018),与对照组(0.975±0.016)比较差别有显著性(P<0.05),而各处理组组间比较差别有显著性(P<0.01);RT-PCR检测各组MTA-1mRNA表达相对值分别是(0.867±0.005),(0.797±0.004),(0.717±0.007),与对照组(0.992±0.009)比较差别有显著性(P<0.05),而各处理组组间比较差别有显著性(P<0.01),这些结果显示β-榄香烯能够降低T24细胞中MTA-1蛋白和MTA-1mRNA的表达,并呈时间依赖性。以0.02mg/ml浓度β-榄香烯作用T24细胞24h、48h和72h,光镜观察各处理组T24细胞形态结果显示:随着0.02mg/ml浓度β-榄香烯作用时间的延长,细胞形状逐渐变为圆形或不规则形,数量增多,贴壁能力下降,表面出现发芽现象,细胞体积明显缩小,胞浆浓缩,胞核比例明显变小,出现单层细胞漂浮、掀起,部分细胞崩解成碎片,或失去了细胞正常形态。
     结论:β-榄香烯能明显抑制膀胱癌T24细胞的生长和增殖,可诱导膀胱癌T24细胞凋亡。其机制可能与下调膀胱癌T24细胞MTA-1蛋白和MTA-1mRNA的表达有关。
Objective: To study theβ-elemene on cell proliferation in T24 bladder tumor cell lines and its expression of MTA-1, deeply investigated how theβ-elemene induced apoptosis of bladder cancer and its possible mechanism .In order to provide experimental evidence for the further study ofβ-elemene anti-cancer action and clinical application.
     Methods: T24 cell lines which were cultured in vitro, were affected by theβ-elemene0.004mg/ml,0.008mg/ml,0.01mg/ml,0.02mg/ml,0.04mg/ml,0.06mg/ml,0.08mg/ml for 24 hours, 48 hours and 72 hours later, The samples were detected by the MTT-method so as to show the effect ofβ-elemene on proliferation of bladder cancer T24 cell lines; and then used the software to calculate the consistence higher than the minimum IC50. Use the Western-blot , RT-PCR assay and cell morphology to reveal the influence on the expression of MTA-1 and the level of mRNA ,and also showd bladder cancer cells morphological changes. The comparative group(ie.0mg/ml) was set up for comparation.
     Results: MTT assay results showed that the minimumβ-elemene concentration which could inhibit more than 50% T24 cell lines was 0.02mg/ml; while the other treatment groups of drugs can inhibit the growth of T24 cell lines and the survival rate of T24 cell lines were reduced with the concentrations increased or the time extended. It means that dependence of dose and time existed. The relative density of MTA-1 in T24 which were affected underβ-elemene (Control group, 0.02mg/ml 24 hours, 48 hours and 72 hours group) were (0.975±0.016), (0.845±0.014), (0.667±0.016), (0.478±0.018), with the difference being statistically significant (p<0.01); the relative density of MTA-1 mRNA in T24 which were affected underβ-elemene (Control group, 0.02mg/ml 24 hours, 48 hours and 72 hours group) were (0.992±0.009), (0.867±0.005),(0.797±0.004),(0.717±0.007), with the difference being statistically significant (p<0.01),these results revealed thatβ-elemene could decrease MTA-1 in T24 cell lines and The expression of mRNA and time-dependent manner.T24 cell lines morphology showed that 0.02mg / ml concentration ofβ-elemene(24 hours, 48 hours and 72 hours group), cell shape gradually become round or irregular,the number increased adherence capacity decreased, the surface of sprouting, cell volume was significantly reduced, plasma concentration, the nucleus was significantly smaller proportion appeared floating single cells and caused some cell disintegration into pieces, or loss of normal cells form.
     Conclusion:β-elemene could inhibit the T24 bladder cancer cell lines growth and proliferation, which may decrease the T24 cell lines with MTA-1 and MTA-1 mRNA expression.
引文
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