熊果酸诱导HL-60细胞凋亡及其机制的初探

目的研究熊果酸在体外对急性早幼粒白血病HL-60细胞增殖抑制及诱导凋亡作用,探讨其中可能的分子机制。方法用体外细胞培养技术,荧光显微镜观察细胞结构变化、MTT法观察细胞生长抑制作用、流式细胞仪检测细胞凋亡及周期变化,免疫细胞化学技术研究熊果酸处理HL-60细胞后,Bcl-2,Survivin蛋白的表达情况。结果 MTT法证实熊果酸对细胞抑制作用强,呈明显的浓度和时间依赖性。显微镜下可见HL-60细胞出现典型凋亡细胞形态学改变:细胞染色质浓缩,聚集于核边缘;细胞体积缩小,核固缩深染,凋亡小体形成。流式细胞仪检测细胞周期阻滞于Go/G1期。免疫细胞化学技术检测熊果酸作用24 h后Bcl-2蛋白表达降低,Survivin蛋白表达降低。结论熊果酸体外可抑制急性早幼粒白血病HL-60细胞增殖,诱导细胞凋亡,其作用机制可能与凋亡基因Bcl-2,survivin表达下调有关。     

紫草素对白血病细胞HL-60增殖及凋亡作用的影响

目的研究紫草素诱导人早幼粒白血病HL-60细胞凋亡的作用机制。方法 MTT比色法检测紫草素对HL-60细胞增殖的影响;Annexin V/PI分析凋亡率;半定量逆转录-聚合酶链反应(RT-PCR)检测bcl-2基因水平,分析白血病HL-60细胞凋亡作用与bcl-2表达水平关系。结果紫草素在1～8μg/mL浓度范围内能抑制HL-60细胞的增殖,具有时间和浓度的依赖性。2μg/mL紫草素能够诱导HL-60细胞凋亡,凋亡呈时间依赖性。在2μg/mL紫草素作用下,HL-60细胞bcl-2表达明显下调。结论紫草素能够诱导HL-60细胞凋亡,其作用机制与下调bcl-2表达有关。     

含益髓灵兔血清诱导HL-60细胞凋亡与对Bcl-2抑制研究

目的：探讨中药复方益髓灵治疗白血病作用机理：方法：在已知益髓灵具有诱导HL-60细胞凋亡的基础上,通过血清药理学方法,选择含不同浓度益髓灵初提物的兔药血清,与人急性早幼粒白血病HL-60细胞共同孵育不同时间后,观察兔药血清对HL-60细胞凋亡的影响,并对其发生凋亡机制进行初步探讨。结果：益髓灵兔药血清有较强的诱导HL-60细胞凋亡作用,以10％兔药血清作用48h效果最好,并发现其诱导凋亡机制与抑制Bcl-2基因表达相关。结论：益髓灵进入动物体内也有诱导白血病细胞凋亡作用,其诱导白血病细胞凋亡是治疗白血病的关键机制之一。     

贵州产天冬总皂苷提取物对人早幼粒白血病细胞株HL-60的影响

目的： 提取贵州产天冬中总皂苷（ASP）并研究其对人早幼粒白血病细胞株HL-60增殖和凋亡作用。 方法： 选取贵州产天冬为研究对象,提取其总皂苷成分;以不同浓度梯度的天冬总皂苷提取物作用于人早幼粒白血病细胞株HL-60,采用MTT法检测细胞增殖情况,采用流式细胞术检测细胞凋亡率;应用实时定量（Real-time） PCR检测各组HL-60细胞中B细胞淋巴瘤/白血病2（Bcl-2） mRNA的表达。 结果： 随着天冬总皂苷浓度的升高,其对HL-60细胞增殖的抑制作用明显增强,呈现剂量依赖趋势;与对照组相比,天冬总皂苷组使HL-60细胞凋亡率明显增加;并且能够使HL-60细胞内的Bcl-2 mRNA表达下降。 结论： 贵州产天冬总皂苷提取物下调Bcl-2 mRNA的表达、诱导人早幼粒白血病细胞株HL-60凋亡,可能是其治疗白血病的机制之一。     

穿心莲内酯对HL-60细胞凋亡、CytC蛋白表达的影响

目的:研究穿心莲内酯诱导人HL-60细胞凋亡及相关机制。方法:以人早幼粒白血病细胞株HL-60为模型,作用于HL-60细胞的穿心莲内酯设3.125、6.25、12.5μg/ml三个受试浓度,实验分为溶媒对照组、穿心莲内酯3.125μg/ml、6.25μg/ml、12.5μg/ml四个组。采用Annexin V/PI双染法流式细胞术检测细胞凋亡率、流式细胞术结合荧光染色检测穿心莲内酯对细胞色素C(Cyt C)蛋白表达的影响。结果:穿心莲内酯能促进HL-60细胞凋亡,且呈剂量依赖性。穿心莲内酯作用HL-60细胞24h,Cyt C蛋白表达增加,12.5μg/ml作用浓度与溶媒对照相比有统计学意义(P0.05)。结论:穿心莲内酯能诱导HL-60细胞凋亡,其诱导凋亡机制可能与Cyt C释放的增加、线粒体通路有关。     

基因芯片分析显示昆明山海棠有机萃取液经NF- κB及线粒体信号传导途径诱导HL- 60细胞凋亡

目的 研究中草药昆明山海棠Tripterygium hypoglaucum (THH）有机萃取液诱导人早幼粒白血病HL—60细胞凋亡过程的信号传导通道及分子机制。方法 应用流式细胞仪研究了THH有机萃取液诱导HL—60细胞的凋亡过程，并应用包含3000人类基因与EST的基因芯片进行基因表达差异分析。结果 基因芯片杂交结果显示有16个基因表达发生大于2倍的显著变化，这些基因同细胞生长，细胞周期调控，细胞分化，以及压力反应有关。部分基因在细胞凋亡过程中起关键作用，如Caspase 3和Caspase 8。结论 THH有机萃取液诱导HL—60细胞凋亡，该过程与NF—κB和线粒体信号传导途径有关。     

昆明山海棠诱导HL-60细胞凋亡的初步研究

目的 探讨中药昆明山海棠（THH）诱导急性白血病细胞凋亡的规律及发生机制。方法 应用染料排除法、活细胞荧光染色、DNA电泳、流式细胞仪、斑点杂交、原位杂交和荧光Ca^2 指示剂进行检测和观察。结果 HL-60细胞在THH作用下出现典型的细胞凋亡特征,包括细胞形态改变,DNA梯状带以及亚G1峰,并且存在明显的量效和时效关系。进一步研究表明,Bcl-2基因在凋亡过程中的表达持续下凋,细胞内游离Ca^2 浓度未发生明显变化。结论：THH有较强的诱导白血病HL-60细胞凋亡的能力,其作用机制与下凋Bcl-2基因表达有关。     

补骨脂素加长波紫外线光化学疗法诱导HL-60细胞凋亡时对Fas表达的影响

目的探讨补骨脂素（PSO）加长波紫外线（UVA）光化学疗法（PUVA）诱导人白血病细胞HL-60凋亡时对Fas表达的影响。方法HL-60细胞分别予不同浓度PSO、接受（或不接受）UVA照射后共同培养，观察细胞超微结构改变，检测细胞Fas基因的表达、细胞凋亡率和Fas蛋白的表达。结果PUVA处理后的HL-60细胞超微结构出现明显的凋亡形态学改变；PSO、UVA照射及PUVA可使细胞凋亡率增加，上调HL-60细胞Fas在基因、蛋白水平的表达，PUVA的作用显著强于前两者：结论PUVA可诱导白血病细胞HL-60发生凋亡，作用强于PSO及UVA照射。PUVA诱导HL-60凋亡的途径之一为上调HL-60细胞Fas基因的表达。     

紫草素诱导白血病HL-60细胞凋亡及其机制研究

目的：研究紫草素在体外对人早幼粒白血病细胞株HL-60增殖的抑制和诱导凋亡作用。方法：MTT比色法检测紫草素对HL-60细胞增殖的抑制作用;AnnexinV／PI双标记流式细胞术检测紫草素对HL-60细胞凋亡率。结果：MTT测定显示紫草素能够对HL-60细胞起到明显的增殖抑制作用,且呈现剂量一效应依赖关系。AnnexinV／PI显示紫草素能够诱导HL-60细胞凋亡,凋亡率呈剂量依赖性。结论：紫草素能抑制人白血病HL-60细胞增殖,并诱导其凋亡。     

莪芪抗瘤方剂（含药血清）诱导白血病HL-60细胞凋亡的实验研究

目的探讨中药复方莪芪抗瘤方剂（舍药血清）在体外对白血病HL-60细胞凋亡影响。方法运用中药血清药理学方法制备莪芪抗瘤方剂血清，四氮唑蓝比色法（MTT法）观察对莪芪抗瘤方剂（含药血清）对HL-60细胞的抑制率；应用形态学，流式细胞术，DNA凝胶电泳等方法检测细胞凋亡的发生。 结果莪芪抗瘤方荆（含药血清）对HL-60细胞生长有抑制作用，这种作用呈时间依赖性，诱导人类早幼粒白血病细胞株HL-60凋亡。结论中药复方莪芪抗瘤方剂可诱导白血病HL-60细胞发生凋亡。     

基因芯片分析显示昆明山海棠有机萃取液经NF- κB及线粒体信号传导途径诱导HL- 60细胞凋亡

目的　研究中草药昆明山海棠 Tripterygium hypoglaucum( THH)有机萃取液诱导人早幼粒白血病 HL-6 0细胞凋亡过程的信号传导通道及分子机制。方法　应用流式细胞仪研究了 THH有机萃取液诱导 HL - 6 0细胞的凋亡过程 ,并应用包含 3 0 0 0人类基因与 EST的基因芯片进行基因表达差异分析。结果　基因芯片杂交结果显示有 16个基因表达发生大于 2倍的显著变化 ,这些基因同细胞生长 ,细胞周期调控 ,细胞分化 ,以及压力反应有关。部分基因在细胞凋亡过程中起关键作用 ,如 Caspase3和 Caspase8。结论　 THH有机萃取液诱导 HL- 6 0细胞凋亡 ,该过程与 NF- κB和线粒体信号传导途径有关。     

Induction of apoptosis in HL-60 cells through the ROS-mediated mitochondrial pathway by ramentaceone from Drosera aliciae

Ramentaceone (1) is a naphthoquinone constituent of Drosera aliciae that exhibits potent cytotoxic activity against various tumor cell lines. However, its molecular mechanism of cell death induction has still not been determined. The present study demonstrates that 1 induces apoptosis in human leukemia HL-60 cells. Typical morphological and biochemical features of apoptosis were observed in 1-treated cells. Compound 1 induced a concentration-dependent increase in the sub-G1 fraction of the cell cycle. A decrease in the mitochondrial transmembrane potential (ΔΨm) was also observed. Furthermore, 1 reduced the ratio of anti-apoptotic Bcl-2 to pro-apoptotic Bax and Bak, induced cytochrome c release, and increased the activity of caspase 3. The generation of reactive oxygen species (ROS) was detected in 1-treated HL-60 cells, which was attenuated by the pretreatment of cells with a free radical scavenger, N-acetylcysteine (NAC). NAC also prevented the increase of the sub-G1 fraction induced by 1. These results indicate that ramentaceone induces cell death through the ROS-mediated mitochondrial pathway.     

Growth inhibitory effect of ethyl acetate-soluble fraction of Cynara cardunculus L. in leukemia cells involves cell cycle arrest, cytochrome c release and activation of caspases

An extract of artichoke Cynara cardunculus L. (CCE) has been shown to exhibit antioxidant and antigenotoxic properties. In this study, the ability of CCE to inhibit the growth of L1210 and HL-60 leukemia cells was studied. Treatment of leukemia cells with a variety of concentrations of CCE (500-2500 microg/microL) for 24 h resulted in dose-dependent inhibition of leukemia cell growth. The cell growth inhibition was accompanied by G(0)/G(1) cell cycle arrest and by a loss of cells in S phase. Futhermore, apoptosis detected as a sub-G(0) cell population and apoptotic DNA fragmentation was observed. More detailed analyses of apoptosis induced by CCE in HL-60 cells revealed that apoptosis progressed through the caspase-9/-3 pathway, as release of cytochrome c, caspase-9/-3 activations and specific proteolytic cleavage of poly(ADP-ribose) polymerase. Taken together, the results suggest that CCE exerts an antiproliferative activity on leukemia cells and induces apoptosis of these cells through a mitochondrial/caspase dependent pathway.     

Reactive oxygen species mediation of baizhu-induced apoptosis in human leukemia cells

Baizhu (Atractylodes macrocephala Koidz) has traditionally been used as an important ingredient of several Chinese herbal medicines, which have been used for abdominal pain and gastroenterology diseases for thousands of years. Despite its popularity in herbal therapies, little is known about the anticancer effect of Baizhu. In this study, the anticancer potential of Baizhu on human hepatoma and leukemia cell lines was evaluated. Baizhu methanol extract induced apoptosis in human lymphoma Jurkat T cells, leukemia U937, and HL-60 cells. This was confirmed by several methods, including hypodiploid cells detection using flow cytometry, the examination of apoptotic bodies containing cells using confocal laser scanning microscopy, and hypodiploid cell population inhibition using the broad spectrum caspase inhibitor z-VAD. Finally, the intracellular reactive oxygen species (ROS), especially hydrogen peroxide (H(2)O(2)) and superoxide anion (O(2)(-)), were found to be elevated after treatment of these cells with Baizhu extracts. Antioxidant N-acetyl cysteine (NAC) pretreatment almost completely inhibited Baizhu-induced apoptosis, suggesting that ROS are the key mediators for Baizhu-induced apoptosis. All these data indicate that Baizhu is a possible anti-tumor agent that induces apoptosis of human leukemia cells through ROS generation.     

丹参酮ⅡA诱导白血病细胞凋亡过程中端粒酶活性的改变

目的观察丹参酮Ⅱ_A(TanⅡ_A)对HL60,K562细胞端粒酶活性的抑制作用和对凋亡相关基因的影响,探讨丹参酮Ⅱ_A对造血细胞的作用机理。方法以HL60,K562为靶细胞,应用细胞培养技术,流式细胞术,透射电镜观察TanⅡ_A对HL60,K562细胞的作用,利用PCRTRAP方法检测TanⅡ_A处理前后HL60,K562细胞端粒酶活性的改变。结果经05μg·mL^-1TanⅡ_A作用6d后,HL60,K562细胞生长明显受到抑制,生长抑制率分别为756%和563%。经丹参酮诱导后,HL60,K562细胞发生凋亡,出现亚二倍体峰;同时显著下调HL60及K562细胞的cmyc,bcl2基因表达,上调cfos基因表达。HL60,K562细胞在TanⅡ_A作用后,端粒酶活性受到抑制,端粒酶活性抑制率分别为308%,508%。结论TanⅡ_A可明显抑制HL60和K562细胞的增殖和细胞端粒酶活性,并诱导细胞凋亡。     

Stellettin A induces oxidative stress and apoptosis in HL-60 human leukemia and LNCaP prostate cancer cell lines

The present study has demonstrated a differential cytotoxicity of stellettin A (1) between human leukemia HL-60 cells (IC50 0.4 microg/mL) and human prostate cancer LNCaP cells (IC50 120 microg/mL). Treatment of cells with 1 revealed the activation of NADPH oxidase, the dramatic generation of reactive oxygen species, and the dissipation of mitochondrial membrane potentials, with HL-60 cells being more sensitive than LNCaP cells by an order of magnitude. Immunoblotting analysis further demonstrated a stronger upregulation of the apoptosis marker proteins, FasL and caspase-3, in HL-60 cells, and pretreatment of cells with antisense oligonucleotide for caspase-3 abolished apoptosis. All available evidence suggests that 1 induces oxidative cell death through a FasL-caspase-3-apoptotic pathway.     

斑蝥素对HL—60细胞和QGY7703细胞的作用研究

采用MTT法和流氏细胞仪技术,研究了斑蝥素对HL－60细胞和QGY7703细胞的存活率和细胞周期分布影响。结果表明,斑蝥素对HL－60细胞的IC50是15．34μmol/L,对QGY7703细胞的IC50是18．54μmol/L。按蝥素处理HL－60细胞和QGY7703细胞24h后,G2－M期细胞分布都有所增加,G0－G1期细胞分布都有所降低;斑蝥素处理HL－60细胞24h后,G0－G1期峰前有亚二倍体峰出现,说明斑蝥素在所用剂量下降够诱导HL－60细胞发生凋亡。     

Induction of apoptosis by 3-amino-6-(3-aminopropyl)-5,6-dihydro-5,11-dioxo-11H-indeno[1,2-c]isoquinoline via modulation of MAPKs (p38 and c-Jun N-terminal kinase) and c-Myc in HL-60 human leukemia cells

Recently, we reported that 3-amino-6-(3-aminopropyl)-5,6-dihydro-5,11-dioxo-11H-indeno[1,2-c]isoquinoline (AM6-36), sharing structural similarity with naturally occurring isoquinolines, induced activities mediated by retinoid X receptor (RXR) response element accompanied by antiproliferative effects on breast cancer cells. To further characterize the biologic potential of AM6-36, we currently report studies conducted with HL-60 human leukemia cells. AM6-36 significantly inhibited cellular proliferation in a dose- and time-dependent manner with an IC(50) value of 86 nM. When evaluated at low test concentrations (≤0.25 μM), AM6-36 induced arrest in the G2/M phase of the cell cycle. At higher concentrations (1 and 2 μM), the response shifted to apoptosis, which was consistent with the effect of AM6-36 on other apoptotic signatures including an increase of apoptotic annexin V(+) 7-AAD(-) cells, loss of mitochondrial membrane potential, induction of poly(ADP-ribose) polymerase cleavage, and activation of several caspases. These apoptotic effects are potentially due to up-regulation of p38 MAPK and JNK phosphorylation and down-regulation of c-Myc oncogene expression. Taken together, AM6-36 might serve as an effective anticancer agent by inducing G2/M cell cycle arrest and apoptosis through the activation of MAPKs and inhibition of c-Myc.