小白菊内酯对U-87 MG迁移、侵袭的影响及其机制研究

目的研究小白菊内酯对恶性人脑胶质瘤细胞系U-87 MG细胞迁移、侵袭的抑制作用,并探讨其作用机制。方法采用CCK-8比色检测法筛选小白菊内酯处理细胞的IC50浓度;采用细胞划痕实验观察小白菊内酯处理0、12、48 h后U-87 MG细胞的迁移情况,并且测量48 h后迁移的距离;采用Transwell实验观察穿膜细胞数,判断细胞的侵袭能力;并采用q PCR以及Western blotting法研究了小白菊内酯处理后,U-87 MG细胞的SNAIL、E-Cadherin的表达变化,以及GSK3β-Ser9蛋白质磷酸化变化。结果 CCK-8比色检测法筛选的小白菊内酯IC50浓度为39μmol/L。与对照组比较,在小白菊内酯处理48 h后,U-87 MG细胞迁移的距离和穿膜细胞数都明显减少,且与浓度呈正相关(P0.01);与对照组比较,小白菊内酯处理的U-87 MG细胞内SNAIL基因表达下降,同时E-Cadherin表达上调,且表达差异明显(P0.05);GSK3β-Ser9残基磷酸化水平下降。结论小白菊内酯能够抑制U-87 MG细胞的迁移、侵袭,可能是通过下调GSK3β磷酸化从而抑制了SNAIL蛋白表达入核,从而促进了E-Cadherin蛋白的表达而引起的。     

小白菊内酯通过下调NOX4抑制结肠癌SW480细胞增殖和侵袭

目的:探讨小白菊内酯对人结肠癌细胞SW480增殖及侵袭的影响,并探讨其抗肿瘤的可能作用机制。方法:以不同浓度(5,10,15μmol·L^-1)小白菊内酯作用于体外培养的人结肠癌SW480细胞,以环磷酰胺(30μmol·L^-1)作为阳性对照。采用CCK8法以及平板克隆法检测细胞增殖,Transwell法检测细胞迁移及侵袭;免疫印迹法(Western blotting)检测NOX4蛋白以及增殖相关蛋白[β-连环蛋白(β-catenin)、G1/S-特异性周期蛋白-D1(Cyclin D1)、侵袭相关蛋白金属基质蛋白酶2(MMP-2)、金属基质蛋白酶9(MMP-9)蛋白]表达情况。结果:随着小白菊内酯浓度的增加,对SW480细胞增殖抑制率明显升高,与空白组比较,差异有统计学意义(P<0.05);同一浓度作用下,随作用时间的延长,增殖抑制率显著升高(P<0.05),小白菊内酯10,15μmol·L^-1浓度组与阳性对照组比较差异有统计学意义(P<0.05);与空白对照组相比,小白菊内酯组克隆细胞形成数、侵袭、迁移细胞数、增殖相关蛋白β-catenin、Cyclin D1、侵袭迁移关蛋白MMP-2、MMP-9以及NOX4蛋白水平显著下降(P<0.05),且小白菊内酯各组间呈浓度依赖(P<0.05);与阳性对照组相比,小白菊内酯10,15μmol·L^-1浓度组以上各指标差异有统计学意义(P<0.05)。结论:小白菊内酯可能通过下调NOX4表达,抑制结肠癌细胞SW480细胞增殖、侵袭能力。     

松果菊苷通过性别决定区Y框蛋白4对胃癌AGS细胞增殖和凋亡的影响研究

摘要：目的:研究松果菊苷（Echinacoside）对胃癌AGS细胞增殖和凋亡的影响。方法:胃癌AGS细胞分成对照组和Echinacoside组,对照组不用松果菊苷处理,Echinacoside组分别用5,10,20,40,80μmol·L-1的松果菊苷培养。CCK-8法检测细胞增殖,PI单染法检测细胞周期,Annexin V-FITC/PI双染法检测细胞凋亡,Western blot法检测Bax、Bcl-2、Cyclin D1、CDK4、性别决定区Y框蛋白4（SOX4）蛋白表达。在胃癌AGS细胞中转染SOX4过表达载体,给予松果菊苷处理,同样测定细胞增殖、周期、凋亡和Bax、Bcl-2、Cyclin D1、CDK4、SOX4蛋白表达。结果:5,10μmol·L-1的松果菊苷处理后的胃癌AGS细胞光密度（OD）值无明显变化,20,40,80μmol·L-1的松果菊苷处理后的胃癌AGS细胞OD值明显降低（P<0.05）,因此选择20,40,80μmol·L-1松果菊苷处理胃癌AGS细胞。与对照组比较,Echinacoside组(20,40,80μmol·L-1松果菊苷处理)胃癌AGS细胞G0/G1期比例升高,细胞凋亡率升高,细胞中Bax蛋白表达水平升高,Bcl-2、Cyclin D1、CDK4、SOX4蛋白表达水平下降,并且松果菊苷对胃癌AGS细胞周期和凋亡的影响随着作用浓度的升高而增加（P<0.05）。SOX4过表达载体能够逆转松果菊苷对胃癌AGS细胞增殖抑制、周期阻滞、凋亡促进、Bax蛋白表达促进和Bcl-2、Cyclin D1、CDK4、SOX4蛋白抑制作用（P<0.05）。结论:松果菊苷通过SOX4抑制胃癌AGS细胞增殖并诱导细胞凋亡。     

百里醌对人胶质瘤细胞凋亡的作用及其机制研究

目的分析百里醌对胶质瘤U87细胞生长抑制和凋亡诱导的功能。方法体外胶质瘤细胞株U87以及人星形胶质细胞株NHA中添加不同浓度百里醌后,CCK-8法检测细胞活力;克隆形成实验观察U87细胞形成细胞克隆的能力;流式细胞术检测细胞周期和ROS含量;Hoechst染色法和流式细胞术测定细胞凋亡;流式细胞术(JC-1荧光染色)观察细胞线粒体膜电位变化;Western blot试验检测U87细胞中细胞周期相关蛋白(Cyclin B1、Cdc2、Cdc25c、p53和p73)、细胞凋亡相关蛋白(Fas-L、Fas、Bax、tBid、PARP、caspase 9和caspase 3)和DNA损伤相关蛋白(p-ATM、p-ATR、γ-H2AX、p-Chk1、p-Chk2和p-p53)表达。结果百里醌可显著抑制U87细胞活力和增殖,呈一定的剂量依赖关系,同时上调p-ATM、p-ATR、γ-H2AX、p-Chk1、p-Chk2和p-p53的表达;百里醌使U87细胞周期停滞在G2/M期,下调Cyclin B1、Cdc2和Cdc25c的表达,同时上调p53和p73的表达;百里醌可诱导U87细胞发生凋亡,上调U87细胞线粒体膜电位,同时促进细胞中Fas-L、Fas、Bax、tBid、cleaved-PARP、cleaved-caspase 9和cleaved-caspase 3的表达;caspase广谱抑制剂Z-VAD-FMK可削弱百里醌的凋亡诱导作用;U87细胞内的ROS表达水平经百里醌作用得以上调,呈一定的剂量依赖关系,百里醌对U87细胞的促进凋亡功能在一定程度上被ROS清除剂N-乙酰-L-半胱氨酸(NAC)逆转。结论百里醌可抑制体外胶质瘤细胞生长,并诱导细胞凋亡,其作用路径可能通过ROS通路实现。     

小白菊内酯对人肝癌细胞HepG-2细胞Caspase-3和NF-κB蛋白表达的影响

目的:研究小白菊内酯对人肝癌细胞HepG-2增殖抑制和诱导凋亡作用的机制.为小白菊内酯在临床上早日应用于肝癌患者提供理论及实验依据.方法:用体外培养的方法培养人肝癌HepG-2细胞;用四唑盐(M TT)比色法检测小白菊内酯对人肝癌HepG-2细胞的抗增殖及细胞毒作用;用倒置显微镜、HE染色光学显微镜;用免疫组织化学染色法检测小白菊内酯作用人肝癌HepG-2前后Caspase-3、NF-κB蛋白阳性表达变化的情况.通过以上实验研究小白菊内酯在体外对人肝癌HepG-2在细胞增殖、细胞凋亡等方面的影响及其作用机制.结果:(1)MTT法结果显示:小白菊内酯对人肝癌HepG-2细胞的作用影响具有浓度和时间依赖性;(2)细胞形态学观察:倒置显微镜观察到对照组细胞贴壁生长,伸展性良好,细胞呈梭形和多角形,细胞之间连接紧密.小白菊内酯作用人肝癌HepG-2 24h以后,增殖速度减慢,细胞贴壁能力下降,细胞之间连接疏松.药物作用48h以后,增殖速度大大减慢,大部分细胞变圆漂浮在培养瓶中.药物作用72h以后,几乎无活细胞,并且可见死细胞碎片;HE染色光学显微镜下观察:对照组细胞呈梭形和多角形,细胞之间连接紧密,细胞胞浆丰富,细胞核完整;药物作用24h以后,细胞伸展减弱,有一部分细胞呈现圆形,细胞之间连接疏松,核浓缩,染色质出现边聚;药物作用48h后视野中可见凋亡细胞和死亡细胞,细胞浆浓缩、染色质浓缩成新月形和“出泡”现象的变化;(3)免疫组化结果显示:实验组Caspase-3表达增加,NF-κB表达降低,与对照组相比具有显著性差异(P＜0.05).结论:小白菊内酯对人肝癌HepG-2细胞有明显的抑制增殖作用,呈现出浓度和时间的依赖性;小白菊内酯对人肝癌HepG-2细胞株有诱导凋亡作用,其诱导人肝癌HepG-2细胞凋亡机制可能与NF-kB、Caspase-3等信号转导有关.     

小白菊内酯抑制紫杉醇诱导的肿瘤细胞凋亡

目的　探讨NF κB在紫杉醇诱导肿瘤细胞凋亡中的作用及小白菊内酯对紫杉醇诱导凋亡的影响。方法　以人乳癌BCap37细胞和人表皮KB细胞为研究对象 ,用 5,1 0和 2 0 μmol·L-1 小白菊内酯预处理细胞 ,以DNA凋亡梯状条带、DNA含量、MTT、细胞甩片及电泳迁移率变动分析 (EMSA)法检测它对紫杉醇诱导细胞凋亡的影响并探索其作用靶点。结果　通过检测DNA凋亡梯状条带、DNA含量和细胞生存率 ,2 0μmol·L-1 小白菊内酯能显著抑制紫杉醇所诱导的BCap37和KB细胞凋亡 ,但不影响紫杉醇诱导肿瘤细胞G2 /M期阻滞。EMSA实验表明小白菊内酯能抑制紫杉醇诱导激活NF κB。结论　小白菊内酯通过抑制NF κB的激活来抑制紫杉醇所诱导的肿瘤细胞凋亡 ,而紫杉醇诱导肿瘤细胞凋亡的过程可能与G2 /M期阻滞无关     

芍药苷对人恶性黑色素瘤细胞A375增殖的体外抑制作用及其机制研究

目的探讨芍药苷对人恶性黑色素瘤细胞A375增殖的体外抑制作用及其作用机制.方法不同浓度芍药苷(3、10、30μmol/L)作用于黑色素瘤细胞A375,MTT法检测细胞活力,流式细胞术检测细胞周期情况,Western blotting法检测NFκB p65信号通路激活情况及下游靶分子Bax、Bcl-2、Cyclin D1、Cyclin E的表达.结果与对照组比较,随着给药浓度的增加,芍药苷对黑色素瘤细胞A375抑制作用逐渐增强,30μmol/L作用48 h时抑制作用最高,并使A375细胞周期阻滞在G1期;芍药苷显著抑制NFκB p65、IκBα的磷酸化,下调Bcl-2、Cyclin D1、Cyclin E的表达,上调Bax表达,差异均具有统计学意义(P<0.01).结论 芍药苷能抑制人黑色素瘤细胞A375体外增殖,可能是通过NF-κB信号通路发挥作用的.     

虎杖苷通过蛋白激酶 B信号通路影响胃癌细胞增殖凋亡

目的 研究虎杖苷对胃癌细胞SGC-7901增殖和凋亡的影响和机制.方法 虎杖苷处理胃癌细胞SGC-7901,MTT法检测增殖,平板克隆实验检测克隆形成能力,碘化丙啶(PI)单染法检测细胞周期分布,膜联蛋白V-异硫氰酸荧光素/碘化丙啶(Annexin V-FITC/PI)双染法检测细胞凋亡,蛋白质印迹法(Western blotting)检测细胞周期蛋白D1(cyclin D1)、周期蛋白依赖性激酶4(CDK4)、Bcl-2相关X(Bax)、剪切型胱天蛋白酶-3(Cleaved-caspase-3)、磷酸化-蛋白激酶B(p-Akt)蛋白表达.用蛋白激酶B(Akt)信号激活剂和虎杖苷联合处理胃癌细胞SGC-7901,检测细胞增殖、克隆、周期、凋亡变化.结果 虎杖苷处理以后的胃癌细胞SGC-7901增殖能力下降[(0.58±0.06)比(0.20±0.01)],细胞克隆形成数目减少[(118.54±10.65)个比(69.52±7.91)个],细胞凋亡增多[(2.97±0.32)％比(17.45±1.69)％],细胞G0/G1比例升高[(50.47±3.25)％比(67.13±3.84)％],cyclin D1、CDK4蛋白表达减少,Bax、Cleaved-caspase-3蛋白表达水平升高,p-Akt蛋白水平降低[(0.51±0.05)比(0.24±0.03)].Akt信号激活剂处理可以逆转虎杖苷对胃癌细胞SGC-7901增殖、克隆抑制和周期阻滞、凋亡促进作用.结论 虎杖苷通过抑制Akt信号通路阻碍胃癌细胞增殖并诱导细胞凋亡.     

黄芩苷抑制胃癌细胞SGC-7901增殖及机制研究

目的研究黄芩苷对人胃癌细胞SGC-7901增殖抑制作用及分子机制研究。方法将细胞随机分为对照组,3个浓度(50,100,200μmol·L^-1)黄芩苷组,噻唑蓝法检测细胞活力;流式细胞术检测细胞周期;分光光度法检测细胞中天冬氨酸蛋白水解酶（Caspase 3）活性;免疫印迹法分析细胞周期蛋白（Cyclin A1）、Cyclin D1、B淋巴细胞瘤-2（Bcl-2）、Bcl-2相关X蛋白（Bax）蛋白含量表达及磷脂酰肌醇3激酶（PI3K）/蛋白激酶B（AKT）通路的激活状况。结果与对照组比较,3个浓度黄芩苷可显著抑制SGC-7901细胞活力（P<0.05）,上调Bax表达,而下调Bcl-2、Cyclin D1表达及AKT磷酸化水平（P<0.05）,使SGC-7901细胞周期阻滞在G1期（P<0.05）,并提高Caspase 3活性（P<0.05）。100,200μmol·L^-1黄芩苷可显著抑制Cyclin A1及PI3K表达量。结论黄芩苷可通过阻断PI3K/AKT信号通路的激活及下游相关分子的表达,进而抑制胃癌SGC-7901细胞增殖。     

15-氧代绣线菊内酯对转移性肾癌细胞系ACHN恶性表型的抑制作用

目的 探讨15-氧代绣线菊内酯对转移性肾癌细胞的体外抗肿瘤效应及其机制.方法 采用不同浓度15-氧代绣线菊内酯处理ACHN细胞株,MTT比色法、划痕损伤实验、膜联蛋白A5-绿色荧光素/碘化丙啶(Annexin V-HTC/H)染色以及流式细胞术分别观察ACHN细胞株增殖、迁移、细胞凋亡的变化,RT-PCR和/或Western blot检测Wnt信号通路靶基因表达.结果 15-氧代绣线菊内酯能明显抑制肾癌ACHN细胞株的增殖,其半数抑制浓度为0.987μmol/L.15-氧代绣线菊内酯呈浓度依赖性降低细胞迁移距离(P＜0.05)、诱导细胞凋亡发生(P＜0.05)、减少G0/G1期细胞、增加G2/M期细胞(P＜0.05).15-氧代绣线菊内酯能够显著抑制Axin2、LEF1、NKD1、Cyclin D1和生存素等Wnt靶基因以及Cdc25和Cdc2等细胞周期相关基因的表达.结论 15-氧代绣线菊内酯能在体外细胞水平显著抑制转移性肾癌ACHN细胞的增殖和迁移作用,诱导细胞凋亡,使细胞停滞于G2/M期;其对肾癌恶性表型的影响是通过抑制Wnt信号通路来实现的,可能是一种潜在的治疗转移性肾癌的药物.     

Modulation of the cell cycle and induction of apoptosis in human cancer cells by synthetic bile acids

In this paper, we will outline the current understanding of cell cycle modulation and induction of apoptosis in cancer cells by natural and synthetic bile acid. Bile acid homeostasis is tightly regulated in health, and their cellular and tissue concentrations are restricted. However, when pathophysiological processes impair their biliary secretion, hepatocytes are exposed to elevated concentrations of bile acids which trigger cell death. In this context, we developed several newly synthesized bile acid derivatives. These synthetic bile acids modulated the cell cycle and induced apoptosis in several human cancer cells similar to natural bile acids. In human breast and prostate cancer cells with different tumor suppressor p53 status, synthetic bile acid-induced growth inhibition and apoptosis were associated with up-regulation of Bax and p21(WAF1/CIP1) via a p53-independent pathway. In Jurkat human T cell leukemia cells, the synthetic bile acids induced apoptosis through caspase activation. In addition to this, the synthetic bile acids induced apoptosis in a JNK dependent manner in SiHa human cervical cancer cells, via induction of Bax and activation of caspases in PC3 prostate cancer cells and induction of G1 phase arrest in the cell cycle in HT29 colon cancer cells. Moreover, they induced apoptosis in four human glioblastoma multiform cell lines (i.e., U-118MG, U-87MG, T98G, and U-373MG) and one human TE671 medulloblastoma cells. In addition to this, a chenodeoxycholic acid derivative, called HS-1200, significantly decreased the growth of TE671 medulloblastoma tumor size and increased life span in non-obese diabetic and severe combined immunodeficient (NOD/SCID) mice. Therefore, these new synthetic bile acids, which are novel apoptosis mediators, might be applicable to the treatment of various human cancer cells.     

Acrylamide-induced apoptosis in rat primary astrocytes and human astrocytoma cell lines

This study aimed to evaluate the acrylamide (ACR)-induced apoptotic effects on rat primary astrocytes and three human astrocytoma-derived cell lines (U-1240 MG, U-87 MG, and U-251 MG). As determined through the MTT assay, treatment with 1 and 2 mM ACR for 24–72 h resulted in decreased cell viability in all cells. Decreases in cell viability could be blocked in all cells with the exception of U-251 MG cells by Z-DEVD FMK. ACR-induced dose-dependent apoptotic effects were also demonstrated by increases in the sub-G₁ phase cell population in all cells. The decreased expressions of pro-caspase 3, 8, and 9 and the interruption of the mitochondrial membrane potential were observed in all cells. Exposure to 2 mM ACR for 48 h resulted in increased Bax/Bcl-2 ratios in primary astrocytes and U-87 MG cells, whereas the overexpression of Bcl-2 was observed in U-1240 MG and U-251 MG cells. The ACR-induced increases in the levels of p53 and pp53 in primary astrocytes could be attenuated by caffeine. These results suggest the existence of a common apoptotic pathway among all cell types and that U-87 MG cells may be a suitable substitute in vitro model for primary astrocytes in future studies on ACR-induced neurotoxicity.     

Effects of hispolon on glioblastoma cell growth

Hispolon is a polyphenolic compound isolated from Phellinus linteus which exhibits antitumor activity. Here, we explored the effects of hispolon on human glioblastoma cells U87MG. Cell viability was examined by MTT assay. Growth was investigated by incubating cells with various concentrations of hispolon (25 and 50 µM) for 24, 48 or 72 h and daily cell count. Cell cycle and apoptosis assay were assessed by flow cytometry. Hispolon decreased cell viability in a dose‐ and time‐dependent manner. The cell cycle distribution showed that hispolon enhanced the accumulation of the cells in G2/M phase. Hispolon decreased the expression of G1–S transition‐related protein cyclin D4 but increased the expression of CDK inhibitor p21. Additionally, hispolon enhanced the expression of p53. Moreover, hispolon treatment was effective on U87MG cells in inhibiting cell viability and inducing cell apoptosis. Our results indicate that hispolon inhibits the cell viability, induces G2/M cell cycle arrest and apoptosis in glioblastoma U87MG cells, and p53 should play a role in hispolon‐mediated antitumor activity.     

Medicarpin suppresses proliferation and triggeres apoptosis by upregulation of BID,BAX, CASP3, CASP8, and CYCS in glioblastoma

Glioblastoma (GBM) is the most malignant brain tumor and incurable. Medicarpin (MED), a flavonoid compound from the legume family, has multiple targets and anticancer properties. However, the role of MED in GBM remains unclear. The objective of this study was to explore the effects of MED on the apoptosis of GBM and to explain the potential molecular mechanisms. We found that the IC₅₀ values of U251 and U-87 MG cells treated with MED for 24 h were 271 μg/mL and 175 μg/mL, and the IC₅₀ values for 48 h were 154 μg/mL and 161 μg/mL, respectively. Additionally, the cell cycle of U251 and U-87 MG cells were arrested at the G2/M phase. Furthermore, the apoptosis rate of U251 and U-87 MG cells increased from 6.26% to 18.36% and 12.46% to 31.33% for 48 h, respectively. The migration rate of U251 and U-87 MG decreased from 20% to 5% and 25% to 15% for 12 h and these of U251 and U-87 MG decreased from 50% to 28% and 60% to 25% for 24 h. MED suppressed GBM tumorigenesis, and improved survival rate of tumor-bearing mice. Taken together, MED triggered GBM apoptosis through upregulation of pro-apoptotic proteins (BID, BAX, CASP3, CASP8, and CYCS), showed strong inhibitory effects on cell proliferation and cell migration, and displayed anti-tumor activity in nude mice.     

败酱草单萜环烯醚酯类对HepG2、MCF7细胞增殖及凋亡的影响

目的 探讨败酱草单萜环烯醚酯类（patrinia monoterpene iridoid ether esters,PMIEE）对HepG2和MCF7细胞增殖抑制和凋亡的影响。方法 HepG2和MCF7细胞经PMIEE作用后,采用CCK8法检测细胞增殖抑制情况;Annexin V-FITC/PI双标记流式细胞术检测细胞凋亡及周期情况;细胞划痕实验检测细胞迁移状况;Western blot法检测Bcl-2、Bax、caspase3、cdc2和CyclinB1的表达情况。结果 CCK8、划痕实验和Annexin V-FITC/PI流式细胞术检测显示,PMIEE对HepG2和MCF7细胞均有显著的增殖抑制、促凋亡率和降低迁移率作用（P<0.05）,呈一定量效关系,且PMIEE对HepG2细胞的周期阻滞以G2/M期为主,MCF7细胞以G0/G1期为主;Western blot结果显示,PMIEE可显著下调2种细胞Bcl-2、cdc2、CyclinB1的表达,上调Bax和caspase3的表达水平。结论 PMIEE可诱导HepG2和MCF7细胞增殖抑制和凋亡,下调Bcl-2、cdc2和CyclinB1表达及上调Bax和caspase3表达,其抗癌的潜在机制可能与此有关。     

三氧化二砷复合物抑制人脑胶质瘤U87细胞生长的机制研究

目的 研究三氧化二砷复合物对人脑胶质瘤U87细胞凋亡的影响，并进一步探讨其作用机制。方法 采用激光共聚焦技术研究三氧化二砷各复合物进入细胞的方式；采用细胞划痕愈合试验观察其对U87细胞迁移能力的影响；采用血管形成试验观察其对新生血管形成能力的影响；流式细胞仪检测各组细胞周期及细胞凋亡；免疫蛋白印迹法检测凋亡相关蛋白Bcl-2、Bax和caspase-3的表达情况。结果 三氧化二砷复合物主要通过内吞方式进入细胞，能显著抑制U87细胞的迁移以及新生血管的形成；其可诱导U87细胞周期阻滞于G2/M期，促进细胞发生凋亡；三氧化二砷复合物促进Bax和caspase-3的表达，抑制Bcl-2的表达。结论 三氧化二砷复合物对U87细胞的抑制作用机制可能是通过内吞方式进入细胞后，上调Bax的表达，下调Bcl-2的表达，最终诱导细胞发生凋亡。     

Parthenolide induces apoptosis in glioblastomas without affecting NF-kappaB

Parthenolide is a sesquiterpene lactone that has been isolated from Tanacetum parthenium (feverfew). Parthenolide has several biological activities including the induction of apoptosis and inhibition of NF-kappaB. Because of its activities against several tumor types and because it is relatively well tolerated, in clinical trial, parthenolide is an attractive compound for the treatment of brain tumors. However, there have been no reports concerning its ability to induce apoptosis in any brain tumor cell lines. In this report we demonstrate that treatment of glioblastoma cells with parthenolide resulted in rapid apoptosis through caspase 3/7 without a suppression of NF-kappaB activity.     

银胶菊内酯对人皮肤癌细胞HaCaT和A375凋亡机制的研究

目的：研究银胶菊内酯对人皮肤癌细胞HaCaT和A375凋亡的影响。方法：XTT法检测银胶菊内酯对HaCaT和A375细胞的增殖抑制作用;荧光染色法检测细胞形态学变化;ELISA法检测细胞DNA断裂影响;流式细胞仪检测细胞周期。结果：银胶菊内酯明显抑制HaCaT和A375细胞的增殖,IC₅₀值分别为1.45 μmol·L^-1和2.9 μmol·L^-1;银胶菊内酯处理过的细胞中出现核碎裂现象,而在对照组细胞中则无此现象;银胶菊内酯诱导HaCaT和A375细胞DNA断裂的长度分别为1.41 nm和0.38 nm,当用银胶菊内酯对HaCaT细胞处理24 h后,S期的细胞比例明显增加（P<0.05）;当用银胶菊内酯对A375细胞处理24 h后,G0~G1期的细胞比例明显增加（P<0.05）。结论：低浓度的银胶菊内酯能通过分别阻滞HaCaT和A375细胞的S期和G0~G1期诱导细胞凋亡。