葫芦素B对人胃癌BGC-823细胞增殖及凋亡的影响

目的探讨葫芦素B对人胃癌BGC-823细胞增殖及凋亡的影响及其作用的分子机制。方法体外培养BGC-823细胞,MTT法观察葫芦素B对细胞增殖的影响,采用流式细胞术检测细胞凋亡率,采用分光光度法检测Caspase-3、Caspase-9的活性,采用Western blot方法检测葫芦素B对Bcl-2、Bax蛋白表达的影响。结果葫芦素B对BGC-823细胞的增殖有抑制作用,且此作用呈剂量和时间依赖性;流式细胞仪检测结果显示,葫芦素B诱导BGC-823细胞凋亡,呈剂量依赖性。葫芦素B处理后Caspase-3、Caspase-9活性升高,细胞抗凋亡蛋白Bcl-2表达减少,促凋亡蛋白Bak的表达增加。结论葫芦素B可以抑制人胃癌BGC-823细胞的增殖并诱导细胞凋亡。     

葫芦素B抑制神经母细胞瘤SH-SY5Y细胞增殖机制的初步研究

目的研究葫芦素B对神经母细胞瘤SH-SY5Y细胞增殖的影响及其作用的分子机制。方法通过MTT法检测葫芦素B对SH-SY5Y细胞增殖的影响,流式细胞仪检测葫芦素B对SH-SY5Y细胞凋亡和生理水平上活性氧含量、线粒体膜电位的影响。Hoechst 33258染色检测药物处理前后细胞形态的变化。Westernblot检测葫芦素B处理SH-SY5Y细胞24 h前后Bcl-2、Bax、p21、p53等蛋白合成的变化。结果实验浓度范围内,葫芦素B可时间与浓度依赖性地抑制SH-SY5Y细胞增殖;浓度依赖性地诱导SH-SY5Y细胞凋亡、活性氧水平升高和线粒体膜去极化;在蛋白水平上,葫芦素B能诱导凋亡抑制蛋白Bcl-2下调,促凋亡蛋白Bax、p21、p53上调。结论葫芦素B在体外能显著抑制SH-SY5Y细胞增殖,这一影响可能通过诱导细胞凋亡、ROS积累、线粒体膜去极化及其相关蛋白表达变化来实现。     

三羟基苯甲酸二聚体诱导HL-60细胞凋亡的作用

三羟基苯甲酸二聚体是从菱角中分离出的抗肿瘤单体化合物。本研究主要探讨三羟基苯甲酸二聚体对人早幼粒细胞性白血病细胞株HL-60细胞的抑制作用及诱导其凋亡的分子机制。通过MTT法检测三羟基苯甲酸二聚体对HL-60细胞的增殖抑制作用; 流式细胞仪检测细胞凋亡、细胞内活性氧及线粒体膜电位的变化; 蛋白印迹 技术 ( Western blotting ) 检测胞浆和线粒体细胞色素c水平, 分光光度法测定Caspase-9、Caspase-3蛋白活性。结果发现, 三羟基苯甲酸二聚体显著抑制HL-60细胞的增殖, 其作用呈时间和剂量依赖性。与对照组比较, 三羟基苯甲酸二聚体可增加HL-60细胞内活性氧水平, 降低HL-60细胞线粒体膜电位, 促进线粒体中细胞色素c释放入胞浆, 激活Caspase-9、Caspase-3蛋白。因此三羟基苯甲酸二聚体可能通过线粒体信号传导途径诱导HL-60细胞凋亡。     

一氧化氮诱导PC12细胞凋亡及人参皂苷Rg1的保护作用

目的　探讨一氧化氮诱导PC12细胞凋亡及人参皂苷Rg1保护作用的可能机制。 方法　DNA凝胶电泳观察DNA的断裂情况 ,流式细胞仪检测线粒体跨膜电位 ,West ernblotting检测胞浆细胞色素C和活化型半胱氨酸蛋白水解酶caspase 3P2 0 水平。结果　一氧化氮供体SNAP(5 0 0μmol·L-1)可诱导PC12细胞凋亡 ,细胞线粒体跨膜电位明显下降、胞浆细胞色素C水平增加及caspase 3得到激活 ;预先经过 5 0、10和 2 0 μmol·L-1等浓度人参皂苷Rg1处理后 ,SNAP诱导的PC12细胞凋亡明显减少 ,同时明显减弱SNAP对细胞线粒体跨膜电位、胞浆细胞色素C水平及cas pase 3激活的影响。 结论　人参皂苷Rg1可抑制一氧化氮诱导PC12细胞凋亡 ,其作用机制可能与其稳定细胞线粒体跨膜电位、减少线粒体细胞色素C向胞浆释放及抑制cas pase 3的激活有关     

镉诱发HEK293细胞凋亡的线粒体途径

目的研究镉引起的HEK293细胞凋亡与线粒体的关系。方法分别以2′,7′-二氯荧光素二酯和若丹明123为荧光探针,经流式细胞仪检测胞浆内活性氧含量和线粒体膜电位的变化;Western印迹法检测线粒体细胞色素c的释放。结果在镉诱导HEK293细胞的凋亡过程中,胞浆内的活性氧水平升高,但能被抗氧化剂N-乙酰-L-半胱氨酸(NAC)抑制;同时,镉使线粒体膜电位下降和线粒体细胞色素c释放进入胞浆,二者都被NAC加剧。结论镉诱导HEK293细胞的凋亡可能通过线粒体途径。     

齿科合金活化线粒体途径诱导L929细胞凋亡的观察

目的：探讨齿科合金通过线粒体途径诱导L929细胞凋亡的作用机制。方法：选用临床常用齿科合金和中科院金属研究所研发的三种低镍合金的浸提液处理小鼠L929细胞,用MTT法检测细胞增殖：用荧光染料罗丹明123检测细胞线粒体跨膜电位;Western-Blot检测线粒体凋亡通路相关蛋白的表达。结果：齿科合金作用L929细胞48h后,细胞线粒体跨膜电位降低,伴有细胞色素C从线粒体到胞浆的释放。结论：齿科合金通过活化线粒体信号转导途径引起线粒体跨膜电位下降与细胞色素C的释放可能是合金诱导L929细胞凋亡途径之一。     

柠檬醛抑制NB4细胞生长并诱导凋亡机制的研究

目的研究柠檬醛（Citral）对急性早幼粒细胞白血病NB4细胞株生长抑制和诱导凋亡作用;研究柠檬醛诱导NB4细胞凋亡可能的机制。方法采用台盼蓝拒染法测定细胞活力;采用CCK-8比色法检测柠檬醛对细胞增殖的影响;形态学观察和流式细胞仪检测细胞凋亡;流式细胞仪检测线粒体膜电位（MMP）改变情况。结果 2～20 mg·L^-1柠檬醛具有时间和剂量依赖方式抑制NB4细胞增殖,诱导细胞凋亡,明显降低细胞线粒体膜电位。结论柠檬醛诱导NB4细胞内线粒体膜电位崩溃可能是引起细胞凋亡的机制之一。     

猫爪草总皂苷体外抗人非小细胞肺癌NCI-H460细胞活性研究

目的 观察猫爪草总皂苷体外对人非小细胞肺癌NCI-H460细胞活性的影响。方法 采用系统溶剂法提取猫爪草总皂苷,3H-TdR掺入法观察猫爪草总皂苷对NCI-H460细胞增殖的影响;流式细胞仪检测其对NCI-H460细胞凋亡和周期的影响。结果 猫爪草总皂苷对NCI-H460细胞增殖有较好的抑制作用,呈现较好的量效关系,可促进NCI-H460细胞的早期凋亡,细胞周期出现G0/G1期的阻滞。结论 猫爪草总皂苷能较好的抑制NCI-H460细胞增殖,其机制可能与诱导凋亡、G0/G1期阻滞有关。     

神经酰胺诱导结肠癌HT-29细胞凋亡与线粒体膜电位变化的关系

目的 探索神经酰胺(C2-ceramide,C2-cer)对人结肠癌HT-29细胞增殖、线粒体膜电位改变、细胞凋亡等的影响.方法 正常培养的HT-29细胞分为C2-cer处理组与非处理组,用MTT法、流式细胞仪等方法观察不同时间C2-cer对细胞增殖、线粒体膜电位改变、细胞凋亡等的影响.结果 加入C2-cer可引起HT-29细胞线粒体膜电位 (△Ψm)下降,细胞增殖受抑,并导致细胞凋亡.上述效应与C2-cer剂量以及作用时间相关.结论 C2-cer可导致HT-29细胞线粒体膜电位(△Ψm)下降,抑制细胞增殖,诱导细胞凋亡.     

23-羟基白桦酸诱导LoVo细胞凋亡与线粒体膜电位的变化

目的探讨23-羟基白桦酸对人结肠癌细胞株LoVo细胞增殖和凋亡的影响。方法采用MTT法检测23-羟基白桦酸对LoVo细胞的增殖抑制作用。Hoechst染色、流式细胞仪检测细胞凋亡及线粒体膜电位的变化。结果23-羟基白桦酸能抑制LoVo细胞的增殖,其作用呈明显的时间和剂量依赖性。Hoechst33258染色显示细胞凋亡特征。23-羟基白桦酸25、50、100及200μmol·L-1作用LoVo细胞48h后,其凋亡率分别为11.32%±0.92%、19.23%±0.78%、24.51%±5.88%及42.22%±2.32%,显示一定的剂量依赖性关系。与空白组相比,23-羟基白桦酸可明显降低LoVo细胞线粒体膜电位(P<0.01)。结论23-羟基白桦酸可抑制LoVo细胞的增殖,其机制与降低线粒体膜电位继而诱导LoVo细胞凋亡有关。     

Chan-Yu-Bao-Yuan-Tang induces apoptosis in NSCLC and SCLC cell lines via a mitochondria-mediated pathway

Previous clinical studies have shown efficacy and safety of the traditional Chinese medicinal herb extract Chan-Yu-Bao-Yuan-Tang (CYBYT) in lung cancer patients. The effects of CYBYT on proliferation and apoptosis in the non-small cell lung cancer cell line NCI-H460 and the small cell lung cancer cell line NCI-H446 were investigated in vitro. CYBYT significantly induced antiproliferative effects of NCI-H460 and NCI-H446 cells in a concentration- and time-dependent manner. The IC(50) values in NCI-H460 cells were 94.37 μg/mL (24?h) and 20.89 μg/mL (48?h), whereas in NCI-H446 cells IC(50) values were 214.72 μg/mL (24?h) and 114.58 μg/mL (48?h). Annexin V-FITC/PI staining showed CYBYT could significantly induce apoptosis in NCI-H460 and NCI-H446 cells, and the total apoptosis rates were positively correlated with the concentration and time of CYBYT treatment. Furthermore, treatment with the broad-spectrum caspase inhibitor (z-VAD-fmk) effectively protected NCI-H460 and NCI-H446 cells against CYBYT-triggered apoptosis. The apoptotic processes involved were a marked decrease in antiapoptotic protein Bcl-2 and an increase in proapoptotic protein Bax. The release of mitochondrial cytochrome c into the cytosol was also observed, which, in turn, resulted in the activation of caspase-9 and caspase-3. CYBYT exerts antiproliferative and growth inhibition effects on NCI-H460 and NCI-H446 cells through the mitochondrial caspase-dependent cell death pathway.     

Chan-Yu-Bao-Yuan-Tang induces apoptosis in NSCLC and SCLC cell lines via a mitochondria-mediated pathway

1. Previous clinical studies have shown efficacy and safety of the traditional Chinese medicinal herb extract Chan-Yu-Bao-Yuan-Tang (CYBYT) in lung cancer patients.

2. The effects of CYBYT on proliferation and apoptosis in the non-small cell lung cancer cell line NCI-H460 and the small cell lung cancer cell line NCI-H446 were investigated in vitro.

3. CYBYT significantly induced antiproliferative effects of NCI-H460 and NCI-H446 cells in a concentration- and time-dependent manner. The IC₅₀ values in NCI-H460 cells were 94.37 µg/mL (24?h) and 20.89 µg/mL (48?h), whereas in NCI-H446 cells IC₅₀ values were 214.72 µg/mL (24?h) and 114.58 µg/mL (48?h). Annexin V–FITC/PI staining showed CYBYT could significantly induce apoptosis in NCI-H460 and NCI-H446 cells, and the total apoptosis rates were positively correlated with the concentration and time of CYBYT treatment. Furthermore, treatment with the broad-spectrum caspase inhibitor (z-VAD-fmk) effectively protected NCI-H460 and NCI-H446 cells against CYBYT-triggered apoptosis. The apoptotic processes involved were a marked decrease in antiapoptotic protein Bcl-2 and an increase in proapoptotic protein Bax. The release of mitochondrial cytochrome c into the cytosol was also observed, which, in turn, resulted in the activation of caspase-9 and caspase-3.

4. CYBYT exerts antiproliferative and growth inhibition effects on NCI-H460 and NCI-H446 cells through the mitochondrial caspase-dependent cell death pathway.

     

Cytotoxic effect of 7beta-hydroxycholesterol on human NCI-H460 lung cancer cells

The cytotoxic activity of 7beta-hydroxycholesterol (7beta-OHC) was evaluated on human NCI-H460 lung cancer cells. 7beta-OHC decreased clonogenic survival of NCI-H460 in a dose dependent pattern. 7beta-OHC induced apoptosis in NCI-H460, with the characteristic features like increase in sub-G(1) hypodiploid (apoptotic) cells, and apoptotic body formation, as evidenced by flow cytometry and fluorescence microscope, respectively. Apoptosis was also associated with loss of mitochondrial transmembrane potential, and the activation of caspases 9 and 3. 7beta-OHC resulted in generation of reactive oxygen species (ROS) during apoptosis. On the whole, the results indicated that 7beta-OHC inhibited the proliferation of NCI-H460 cells through apoptosis via caspase activation.     

冬虫夏草菌丝体水提醇沉物体外抗肿瘤活性研究

目的研究冬虫夏草菌丝体水提醇沉物的体外抗肿瘤活性及其机制。方法采用热水浸提一醇沉法得到水提物,高效液相色谱仪测定水提醇沉物中腺苷的量;采用MTT法测定其抗肿瘤活性,利用流式细胞仪结合碘化丙锭染色法检测其对细胞周期的抑制。结果实验表明水提醇沉物能抑制人肝癌HepG2细胞株及大细胞肺癌NCI．H460细胞株的增殖,并呈浓度相关性;半数抑制浓度（IC50）值分别为（1．49±0．19）和（1．67±0．27）mg／mL。细胞周期分析表明,水提醇沉物分别阻滞HepG2及NCI．H460细胞周期于G,／M期、S期,并可诱导上述两种细胞发生凋亡。结论冬虫夏草水提醇沉物通过阻滞HepG2及NCI-H460细胞周期循环,诱导其凋亡,从而表现出良好的增殖抑制活性。为深入研究冬虫夏草菌丝体水提醇沉物抗肿瘤的机制提供了实验证据。     

长梗秦艽酮诱导人肺鳞癌NCI-H520细胞凋亡

目的探讨长梗秦艽酮诱导肺鳞癌NCI-H520细胞凋亡的作用。方法应用四甲基偶氮噻蓝(MTT)法检测长梗秦艽酮对NCI-H520细胞增殖的影响;流式细胞术检测细胞凋亡率;透射电子显微镜观察长梗秦艽酮作用细胞后亚细胞结构的变化。结果 MTT结果显示,长梗秦艽酮(10、20、30、40μmol/L)明显抑制NCI-H520细胞增殖,且呈剂量效应关系;流式细胞术显示,长梗秦艽酮可以诱导NCI-H520细胞凋亡,凋亡率呈剂量效应关系;电子显微镜下经蛇床子素作用后的细胞可见染色质浓聚、边集等典型的凋亡改变,而空白对照组没有相应的变化。结论长梗秦艽酮能有效抑制肺鳞癌NCI-H520细胞的增殖、诱导细胞凋亡。     

Inhibition of lung cancer cell growth by quercetin glucuronides via G2/M arrest and induction of apoptosis.

Lung cancer is the leading cause of cancer death in many developed countries, including Taiwan. Quercetin, a widely distributed bioflavonoid, is well known to induce growth inhibition in a variety of human cancer cells. Quercetin glucuronides are the main circulating metabolites after dietary supplements with quercetin in humans. However, there is little information available as to how quercetin glucuronides affect human cancer cells. We investigated the effects of quercetin glucuronides in a human lung cancer cell line NCI-H209. We checked the cell viability, cell cycle checkpoint proteins, pro- and antiapoptotic proteins, caspase-3 activity, and gene expression by flow cytometry and Western blot. The viability of cells decreased in a dose- and time-dependent manner. Cell cycle analysis revealed a significant increase of the proportion of cells in G2/M phase and subG0/G1 phase (corresponding to apoptotic cells). Moreover, quercetin glucuronides increased the expressions of cyclin B, Cdc25c-ser-216-p, and Wee1 proteins, indicating the G2/M arrest. We also demonstrated a concurrent decrease of the mitochondrial membrane potential, release of cytochrome c, up-regulation of Bax, down-regulation of Bcl-2, and activation of caspase-3, and subsequently, cleavage of poly(ADP-ribose) polymerase. In addition, quercetin glucuronide-induced apoptosis was totally blocked by the broad-spectrum caspase inhibitor benzyloxycarbonyl-Val-Ala-Asp fluoromethylketone. Taken together, we demonstrated that quercetin glucuronides inhibited proliferation through G2/M arrest of the cell cycle and induced apoptosis via caspase-3 cascade in the human lung cancer cell line NCI-H209. Delineation of the biological effects of specific major quercetin metabolites on chemotherapeutic potential or chemoprevention of human cancers warrants further investigation.     

岩大戟内酯B对人乳腺癌Bcap37细胞凋亡的影响

目的:探讨岩大戟内酯B(jolkinolide B)诱导人乳腺癌Bcap37细胞凋亡及其可能机制。方法:分别应用MTT和AnnexinV-FITC/PI双染法检测jolkinolide B对Bcap37细胞的生长抑制率和细胞凋亡率;用流式细胞仪检测线粒体膜电位和细胞内游离Ca2+浓度的变化;RT-PCR检测jolkinolide B对Bcap37细胞caspase-3mRNA表达的影响。结果:jolkinolide B可显著抑制Bcap37细胞的增殖,呈剂量和时间效应关系;随jolkinolide B剂量增加,细胞凋亡率明显增加;线粒体膜电位下降,并伴有细胞内游离钙浓度增加,与对照组相比差异显著(P<0.01),同时caspase-3mRNA表达水平明显增高。结论:jolkinolide B可通过提高细胞游离Ca2+水平,激活内源性线粒体信号转导途径而诱导Bcap37细胞凋亡。     

葫芦素B纳米脂质载体对结肠癌和乳腺癌细胞抑制及凋亡作用的研究

目的：研究葫芦素B纳米脂质载体（CuB-NLC）对结肠癌Lovo细胞,乳腺癌MCF-7细胞的体外细胞毒性。方法：结肠癌Lovo细胞,乳腺癌MCF-7细胞常规复苏、培养及传代,取处于对数生长期的细胞用于实验。采用CCK-8法检测质量浓度为0、0.0625、0.25、1.00、4.00、16.0 mg/L的CuB-NLC对结肠癌Lovo细胞,乳腺癌MCF-7细胞的毒性,流式细胞仪检测结肠癌Lovo细胞,乳腺癌MCF-7细胞的细胞周期进程及Annexin V/PI双染法检测细胞的凋亡率。结果：与葫芦素B （CuB）相比CuB-NLC对结肠癌Lovo细胞,乳腺癌MCF-7细胞生长抑制作用明显增强（P＜0.05）,且这种抑制作用随药物浓度增加而增强。CuB组及CuB-NLC组作用于结肠癌Lovo细胞、乳腺癌MCF-7细胞48 h后,与NLC空白组及DMSO对照组相比较,CuB及CuB-NLC均能够引起结肠癌Lovo细胞、乳腺癌MCF-7细胞G2/M期阻滞,同时伴有G0/G1期细胞减少, CuB-NLC组的作用更加明显,有统计学差异（P＜0.05）。Annexin V/PI双染法检测结果表明,CuB-NLC能显著诱导结肠癌Lovo细胞,乳腺癌MCF-7细胞凋亡。结论：葫芦素B纳米脂质载体能够抑制结肠癌Lovo细胞,乳腺癌MCF-7细胞的增殖,诱导细胞凋亡。     

土槿乙酸衍生物PBA-D1诱导Hela细胞凋亡及其机制

目的研究土槿乙酸衍生物PBAD1体外能否诱导宫颈癌细胞株(Hela细胞)发生凋亡及其发生机制。方法采用MTT、SRB、细胞生长曲线、细胞集落、荧光显微镜检测凋亡细胞、DNAladder、流式细胞仪等方法进行凋亡检测,用Westernblot方法检测凋亡过程中相关基因表达的变化。结果土槿乙酸衍生物PBAD1在体外试验中对Hela细胞的杀伤力强,荧光显微镜观察到了凋亡小体;DNAladder法检测到凋亡时DNA降解形成的梯带,流式细胞仪检测到了细胞凋亡峰,同时观察到细胞周期的变化。在凋亡过程中,凋亡相关基因p53基因表达明显增高,而bcl2表达下调。结论PBAD1体外能诱导Hela细胞发生凋亡,其机制可能与p53基因表达上调及bcl2基因表达下调有关。