1-甲基-3-异丁基黄嘌呤延迟去除生长因子诱导的血管内皮细胞凋亡(英文)

目的:研究1-甲基-3-异丁基黄嘌呤(MIBX)对去除生长因子(aFGF和血清)诱导的血管内皮细胞凋亡的影响.方法:通过细胞存活率的分析,荧光显微技术和DNA凝胶电泳等方法,检测MIBX对细胞凋亡的影响.结果:用25-200μmol/L的MIBX处理培养在无aFGF和血清的培养液中的血管内皮细胞,50-200μmol/L的MIBX在处理6h明显抑制了凋亡小体的形成和DNA的片断化.但是同样浓度的MIBX处理细胞12h以后,处理组和对照组之间无明显差别.结论:MIBX延迟去除aFGF和血清诱导的血管内皮细胞凋亡.     

四丁基丙二胺对人MG63骨髓瘤细胞增殖、凋亡和迁移能力的影响

目的分析新多胺类似物四丁基丙二胺(tetrabutylpropanediamine,TBP)对人骨髓瘤MG63细胞生长的影响及其机制。方法 MTT法用于分析细胞增殖,流式细胞分析用于细胞周期和凋亡细胞鉴定,琼脂糖凝胶电泳用于分析DNA片段化,Western blot用于分析细胞凋亡相关蛋白的表达水平,Transwell技术用于分析细胞的迁移能力。结果TBP明显抑制MG63细胞的增殖和迁移能力,抑制效应呈时间和剂量依赖性。流式细胞分析发现,TBP干扰细胞周期,导致G1和G2期细胞比例升高,但S期细胞比例明显下降,同时凋亡细胞数量大幅增加。TBP处理后,细胞染色体DNA出现凋亡细胞典型的DNA片段化现象,细胞质中促凋亡蛋白Bax和细胞色素C含量明显升高。结论 TBP具有抑制人骨髓瘤MG63细胞增殖的药理活性,其机制与抑制细胞周期和诱导细胞凋亡有关,提示TBP具有用于临床骨髓瘤治疗的潜在价值。     

手性3-n丁基苯酞对大鼠局灶性脑缺血诱导的凋亡的影响

目的:观察和比较手性3-n丁基苯酞(NBP)对大鼠局灶性脑缺血再灌注诱导的凋亡的影响。方法:插线法制备大脑中动脉阻断(MCAO)模型,原位末端标记(TUNEL)和琼脂糖凝胶电泳检测DNA断裂,蛋白质印迹和免疫组化方法检测细胞色素c及caspase-3蛋白的表达。结果:大鼠局灶性脑缺血2小时,再灌注开始后24小时可见明显的TUNEL阳性染色和DNA ladder.s-(-)-NBP 5,10 mg/kg显著减少TUNEL阳性细胞数和DNA ladder,s-(-)-NBP 10 mg/kg几乎完全抑制DNA片段化,而r-(+)-NBP 10 mg/kg仅有轻度抑制作用。(±)-NBP(20 mg/kg)对DNA片段化的抑制作用介于s-(-)-NBP(10 mg/kg)和r-(+)-NBP(10 mg/kg)之间。脑缺血过程中可见到线粒体细胞色素c的释放及caspase-3的激活,s-(-)-NBP能明显抑制这一效应,r-(+)-NBP和(±)-NBP对细胞色素c和caspase-3作用的强弱与它们抑制DNA片段化的作用强度相似。结论:NBP,尤其是s-(-)-NBP能够抑制脑缺血诱导的DNA片段化,细胞色素c释放和caspase-3激活。     

白术内酯Ⅰ体内外的抗黑色素瘤研究

目的:探讨自术内酯Ⅰ对人黑色素瘤细胞A875的作用、对肿瘤血管生成的作用和对小鼠黑色素瘤荷瘤小鼠肿瘤生长的抑制作用及其机制.方法:MTT法检测白术内酯Ⅰ对A875细胞增殖的影响,流式细胞仪检测白术内酯Ⅰ对A875细胞周期及其凋亡的影响;白术内酯Ⅰ对体外血管内皮细胞成管的影响;白术内酯Ⅰ对荷瘤小鼠肿瘤生长及小鼠体质量的影响.结果:白术内酯Ⅰ抑制黑色素瘤细胞A875细胞增殖;作用48 h后,细胞周期中G2/M期和S期细胞比例显著提高,G0/G1期细胞比例减少;细胞凋亡比例显著增加;白术内酯Ⅰ显著抑制内皮细胞成管;白术内酯Ⅰ显著抑制荷瘤小鼠肿瘤的生长,而对小鼠体质量无影响.结论:白术内酯Ⅰ抑制黑色素瘤细胞A875增殖,诱导细胞凋亡,发生细胞周期阻滞;并且能够抑制荷瘤小鼠肿瘤生长,不影响荷瘤小鼠的体质量.     

新型Topo Ⅰ抑制剂CPUY013对胃腺癌细胞BGC823的体内外作用

探讨CPUY013在体内外对人胃腺癌BGC823细胞的抗肿瘤活性及其机制.采用MTT法、克隆原形成法检测CPUY013对BGC823细胞增殖的抑制作用;体外实验以pBR322 DNA为底物,依据质粒的松弛和超螺旋形式在琼脂糖电泳上泳动度对药物抑制解旋的作用进行定性分析.用AO/EB荧光染色技术、DNA凝胶电泳及JC-1线粒体膜电位检测试剂盒检测细胞凋亡.口服给药CPUY013后观察其对裸鼠移植瘤的生长抑制作用;用流式细胞术观察CPUY013对BGC823细胞周期的影响;采用Western blotting分别检测CPUY013处理后的BGC823细胞中Topo Ⅰ及凋亡相关蛋白表达的改变.结果表明,CPUY013呈明显的剂量依赖性抑制BGC823细胞的增殖.随着剂量的增加,CPUY013对Topo Ⅰ松弛活性的抑制趋势增强.100 μmol·L-1 CPUY013和拓扑替康(TPT)对Topo Ⅰ松弛活性的抑制呈现相似的变化趋势.CPUY013可使大部分BGC823细胞阻滞在S期,并诱导细胞凋亡;出现DNA片段化,亚G1峰显著增加,线粒体膜电位降低,荧光染色后出现凋亡细胞的特征性改变等.同时,CPUY013能明显抑制BGC823裸鼠移植瘤的生长,150 mg·kg-1剂量组的瘤重抑制率为62.1%.CPUYOl3使BGC823细胞内Topo Ⅰ和bel-2蛋白表达均有所下调,p53和bax蛋白表达有明显上调趋势,bcl-2/bax比值明显降低,caspase-3蛋白表达增高.新型Topo Ⅰ抑制剂CPUY013在体内明显抑制移植瘤的生长,体外可诱导细胞凋亡从而抑制BGC823细胞增殖,其机制可能与抑制Topo Ⅰ,从而下调bcl-2,上调bax和p53蛋白的表达有关.     

多胺类似物CHEN，CPEN和BENS对Hela宫颈癌细胞生长的影响*

［摘要］　目的：探讨多胺类似物CHEN，CPEN和BENS对宫颈癌细胞株Hela生长的影响。方法：MTT法检测细胞的生长状况；亚凋亡峰流式细胞分析法及DNA片段化分析法检测细胞凋亡；化学分析法测定精胺氧化酶（SMO）活性。结果：3种多胺类似物均可显著抑制Hela癌细胞增殖，抑制作用随药物浓度加大而增加，其细胞毒性大小依次为CHEN>CPEN>BENS。细胞凋亡分析发现，CHEN，CPEN和BENS可诱导Hela细胞程序性凋亡，导致凋亡峰出现和明显的DNA片段化。用10 μmol•L-1 CHEN，CPEN和BENS处理Hela细胞24 h可显著性抑制精胺氧化酶活性。结论：CHEN，CPEN和BENS通过诱导细胞凋亡而抑制Hela癌细胞生长，其诱导凋亡的作用与精胺氧化酶活性无关。     

N~1-乙基-N~(11)-(环庚烷基)甲基-4,8-二氮杂癸烷对宫颈癌细胞的作用

目的探讨N1-乙基-N11-(环庚烷基)甲基-4,8-二氮杂癸烷(CHEN)对宫颈癌细胞株Siha的抗肿瘤作用。方法MTT法检测细胞的生长情况;流式细胞术及DNA片段化分析法检测细胞凋亡;化学分析法测定精胺氧化酶(SMO)活性。结果CHEN可显著抑制Siha宫颈癌细胞生长,且抑制作用随药物浓度增加而增强,用10μmol·L-1 CHEN处理细胞,24和48h生长抑制率分别高达61%和75%。细胞凋亡分析发现,CHEN处理可诱导Siha细胞凋亡,导致凋亡峰出现和细胞核DNA片段化。在0~20μmol·L-1浓度范围内,CHEN作用24h对Siha细胞SMO活性无明显影响。结论CHEN通过诱导细胞凋亡而抑制宫颈癌细胞生长,该抑制作用与SMO活性无关。     

RNA干扰Aurora A表达对人子宫内膜癌细胞的生长与细胞周期的影响

目的 探讨应用RNA干扰技术抑制Aurora A基因表达,并研究Aurora A基因表达下调对人子宫内膜癌细胞生长和细胞周期分布的影响.方法 用RNA干扰法抑制Aurora A的蛋白表达,RT-PCR及Western blot方法 检测Aurora A mRNA和蛋白表达,流式细胞仪检测细胞周期分布的变化,四氮唑盐法(MTT)检测转染前后细胞生长抑制率变化.结果 siRNA Aurora A可明显降低Aurora A mRNA和蛋白的表达,siRNA Aurora A导入Ishikawa细胞48 h后,细胞的生长被抑制,细胞周期阻滞于G2/M期和S期;细胞的凋亡率明显升高.结论下调AuroraA表达可抑制人子宫内膜癌细胞系Ishikawa的增殖,同时导致细胞阻滞于G2/M期及S期并且促进细胞凋亡.     

三氧化二砷联合木黄酮抑制CML细胞增殖的研究

目的　探索三氧化二砷 (As2 O3)联合酪氨酸激酶抑制剂木黄酮抑制慢性粒细胞性白血病 (CML)细胞增殖的效应及可能机制 ,为临床应用提供理论依据。方法　以CML细胞系K5 6 2为模型 ,通过细胞增殖检测、形态学观察、肿瘤集落形成和琼脂糖凝胶电泳手段 ,观察比较As2 O3 与木黄酮对CML细胞的增殖抑制效应。结果　经≥ 2 5 μmol/LAs2 O3 和 5mg/L木黄酮处理 2天后的K5 6 2细胞可出现增殖受抑和凋亡的形态学改变及DNA片段化 ,二者具有协同抑制作用。结论　As2 O3 与木黄酮能分别或协同抑制K5 6 2细胞生长 ,机制与诱导细胞凋亡有关     

龙须菜藻红蛋白抗肿瘤活性的研究

目的探讨龙须菜藻红蛋白抗肿瘤活性。方法体内实验以S180荷瘤小鼠为肿瘤模型,检测藻红蛋白粗提物(CPE)对肿瘤生长的抑制作用以及对免疫器官的影响;体外实验采用MTT法检测不同浓度的藻红蛋白(PE)对人宫颈癌HeLa、人食道癌EC109和人血管内皮细胞等细胞的作用,流式细胞仪、Annexin V-FITC/PI双荧光染色法观察藻红蛋白对HeLa细胞周期及细胞凋亡的影响。结果CPE能显著的抑制小鼠S180肉瘤生长,当灌胃剂量在100~300 mg.kg-1范围内时,呈量效关系,其中剂量为300 mg.kg-1时,其抑瘤率达49%,且能极显著地提高荷瘤小鼠的胸腺指数;体外实验表明PE对人宫颈癌细胞HeLa有明显的抑制作用,其抑制率达70%以上,并存在剂量依赖性。PE可阻滞HeLa细胞从G2/M期进入S期,促使细胞凋亡。但PE对人食道癌EC109细胞无作用,对正常的人血管内皮细胞有一定的促生长作用。结论龙须菜藻红蛋白具有体内抑制S180肉瘤生长的活性,体外对培养的不同细胞作用不同,对人宫颈癌HeLa细胞有较强的抑制作用。     

Effects of novel safrole oxide derivatives, 1-methoxy-3-(3,4-methylenedioxyphenyl)-2-propanol and 1-ethoxy-3-(3,4-methylenedioxyphenyl)-2-propanol,on apoptosis induced by deprivation of survival factors in vascular endothelial cells

Two safrole oxide derivatives, 1-methoxy-3-(3,4-methylenedioxyphenyl)-2-propanol (MOD) and 1-ethoxy-3-(3,4-methylenedioxyphenyl)-2-propanol (EOD), were newly synthesized as promoters of apoptosis in vascular endothelial cells (VECs). The purpose of this study was to investigate the effects of these two safrole oxide derivatives on cell growth and apoptosis induced by deprivation of survival factors (serum and fibroblast growth factors, aFGF and bFGF) in VECs. Morphological changes were observed with light microscopy. Cell growth was determined by using MTT (3-[4, 5-dimethyl thiazol-2-yl]-2, 5-diphenytetrazolium) method. DNA fragmentation was analyzed by agarose gel electrophoresis and fluorescence microscopy. Apoptosis rate and cell cycle distribution were analyzed by flow cytometry (FCM). The cells deprived of FGF and serum were exposed to MOD 10-40 mg l(-1) for 24 h. Cell growth was suppressed (P<.01), while detachment and DNA fragmentation of these cells were promoted (P<.01). When the cells were treated with MOD30 mg l(-1) for 24 h, apoptosis rate was 21.43% (P<.01). The fact that 66.50% of the cells were trapped in S phase of cell cycle indicated that the cell cycle was blocked at S phase. Treated with EOD 10-40 mg l(-1) for 24 h, the cells were observed; the results showed that VEC growth was inhibited and the apoptosis was triggered (P<.01). At 30 mg l(-1) concentration, EOD blocked 55.22% of the cells at S phase. The data suggested that MOD and EOD might promote apoptosis of VEC by blocking the cell cycle at S phase.     

Effect of manoalide on apoptosis induced by deprivation of growth factors in vascular endothelial cells.

AIM: To study effect of manoalide on apoptosis induced by deprivation of acidic fibroblast growth factor (aFGF) and serum in vascular endothelial cells (VEC). METHODS: Morphologic changes were observed by light microscopy. Viability was determined by counting the cells that attached to dishes after treatments. DNA fragmentation was analyzed by agarose gel electrophoresis and fluorescence microscopy. RESULTS: The cells deprived of aFGF and serum were exposed to manoalide 1-4 mumol. L-1 for 48 h, detachment and DNA fragmentation of these cells were suppressed. At 7 mumol. L-1, manoalide promoted detachment and DNA fragmentation of VEC. CONCLUSION: manoalide 2 mumol.L-1 inhibited, but 7 mumol.L-1 promoted, apoptosis of VEC.     

Integrin beta4 mAb inhibited apoptosis induced by deprivation of growth factors in vascular endothelial cells.

AIM: To understand the mechanism by which anti-beta4 integrin monoclonal antibody (mAb) inhibits apoptosis of vascular endothelial cells (VEC). METHODS: Viability was determined by counting the cells that attached to dishes after treatments. DNA fragmentation was analyzed by agarose gel electrophoresis and fluorescence microscopy. The intracellular content of cAMP was measured by radioimmunoassay (RIA). The levels of p53 and Ras expressions were analyzed by fluorescence microscopy combined with immunofluorescence under laser scanning confocal microscopy. RESULTS: After the cells were deprived of fibroblast growth factor (FGF) and serum were exposed to the mAb 5 mg/L for 24 h, the detachment and DNA fragmentation of these cells were suppressed. When cells were deprived of FGF and serum, the intracellular cAMP level and Ras protein content decreased (P<0.05), while the level of p53 protein expression increased (P<0.05). But in the presence of anti-beta4 integrin mAb, VEC apoptosis was inhibited, and at the same time, the changes mentioned above were obviously blocked (P<0.05). CONCLUSION: Anti-4 integrin mAb inhibited apoptosis by affecting the level of cAMP, and blocking down-regulation of Ras protein and up-regulation of p53 protein in VEC.     

Safrole oxide inhibits angiogenesis by inducing apoptosis

Our previous studies indicate that 3, 4-(methylenedioxy)-1-(2', 3'-epoxypropyl)-benzene (safrole oxide), a newly synthesized compound, induces apoptosis in vascular endothelial cells (VECs) and A549 lung cancer cells. To our knowledge, the inhibition of angiogenesis by safrole oxide has not been reported yet. We report here that cultured rat aorta treated with safrole oxide exhibited a significant microvessel reduction as determined by counting the number of microvessels in a phase contrast microscope. There were more microvessels formed in the presence of A549 lung cancer cells in rat aorta model, while a dramatic inhibition of angiogenesis was obtained by adding 220-450 micromol l(-1) of safrole oxide to the growth medium (P<.01). The culture of rat aorta treated with safrole oxide produced only some abortive endothelial cells but not microvessels. Furthermore, safrole oxide induced antiangiogenic effect in the chorioallantoic membranes (CAM) as a dose dependent manner. Eggs treated with 2-11 micromol 100 microl(-1) per egg of the safrole oxide for 48 h exhibited a significant reduction in blood vessel area of the CAM, a process likely mediated by apoptosis as demonstrated by DNA fragmentation. Our results suggest that safrole oxide has antiangiogenic activity and this effect might occur by induction of cellular apoptosis.     

雄黄抑制宫颈癌细胞株增殖和诱导凋亡的体外研究

目的:体外研究中药雄黄主要成分As4S4对子宫颈癌细胞株Hela细胞的增殖抑制和诱导凋亡的作用。方法:以As4S4不同浓度(7.5、15、30、60mg/L),分12h,24h,36h,48h,60h处理Hela细胞,用光镜观察细胞变化;四甲基偶氮唑蓝(MTT)法测定细胞增殖抑制率;流式细胞仪(FCM)检测细胞凋亡率;用DNA梯状电泳(DNA ladder)检测凋亡的发生。结果:不同浓度(7.5、15、306、0 mg/L)的As4S4处理的Hela细胞,细胞增殖受到抑制,作用呈明显的时效和量效关系,差异有非常显著性(P<0.01);As4S4诱导Hela细胞的凋亡率为(8.13±1.13)%~(62.36±4.42)%,与对照组比较(2.84±1.88)%,差异有极显著性(P<0.01),并呈浓度依赖性;DNA ladder呈梯状条带。结论:雄黄体外对宫颈癌细胞株Hela细胞具有增殖抑制和促进凋亡作用。     

钩藤碱对多巴胺诱导的NT2细胞凋亡的影响

目的:观察钩藤碱(rhnchophylline,Rhy)对多巴胺(dopamine,DA)诱导NT2细胞凋亡的防护作用.方法:以LDH的漏出率反映细胞的生存率;用TUNEL染色法和DNA琼脂糖凝胶电泳法观察NT2神经元凋亡情况;用Western blotting法测定Bcl-2蛋白表达.结果:Rhy在5和50μmol/L的浓度下能显著地抑制由DA所致的乳酸脱氢酶的漏出,以及明显地提高以PMS试剂转化为指标的生存率(P<0.05,P<0.01);在分化的NT2细胞神经元中,转染bcl-2基因的神经元凋亡率明显低于未经bcl-2基因转染的神经元,而Rhy使DA诱导的转染bcl-2基因神经元和未转染bcl-2基因神经元的凋亡率均明显减少;Rhy能抑制DA所致的DNA降解,但Phy对NT2细胞Bcl-2蛋白表达无明显影响.结论:Rhy能对抗DA诱导的NT2细胞的损伤.     

Effects of paclitaxel on proliferation and apoptosis in human acute myeloid leukemia HL-60 cells

INTRODUCTION Most chemotherapeutic drugs exert their anti-tu-mor effects by inducing apoptosis. A powerful newapproach to facilitate the discovery of unique genes isthe recently developed microarray technology[1]. Thisprocess allows the expressions of thousands of genesto be compared and profiled simultaneously. The de-velopment of microrobotics and a computer-enhanceddetection system allow up to 1×104 separate gene ele-ments to be placed on a glass slide. This slide can behybridized to …     

三氧化二砷诱导K562/ADM细胞凋亡的作用机制研究

目的 :观察三氧化二砷 (As2 O3 )对K5 6 2 ADM细胞的诱导凋亡效应 ,探讨其作用机制。方法 :应用噻唑蓝 (MTT)比色法、Wright Giemsa染色、DNA琼脂糖凝胶电泳和流式细胞术 (FCM)观察K5 6 2 ADM细胞凋亡 ;FCM测定K5 6 2 ADM细胞Fas、Bcl 2、P5 3蛋白水平的变化 ;比色法检测Caspase3活性变化。结果 :As2 O3 可抑制K5 6 2 ADM细胞增殖 ;K5 6 2 ADM呈典型凋亡形态改变 ;DNA电泳可见梯状条带出现 ;FCM分析示亚G1期细胞比例增高 ,G2 M期阻滞 ;Fas、P5 3蛋白表达明显上调 ;Caspase3活性明显增强。结论 :As2 O3 可通过Fas依赖性Caspase3激活而诱导K5 6 2 ADM细胞凋亡。     

紫杉醇诱导人乳腺癌MCF-7细胞周期阻断及凋亡的基因表达谱分析

目的研究紫杉醇诱导人MCF-7细胞周期阻断及凋亡的分子机制。方法用流式细胞仪分析紫杉醇对MCF-7细胞周期变化的影响，用自制的含9 984个已知基因和EST的高密度基因芯片检测MCF-7细胞在不同浓度紫杉醇作用下的基因表达变化。结果MCF-7细胞在100 nmol·L^-1紫杉醇作用24 h，流式细胞仪结果显示77.8%细胞阻断在G₂/M期和1.3%细胞发生凋亡；基因表达谱分析发现：在12.5 nmol·L^-1 (IC₅₀)及100 nmol·L^-1紫杉醇作用下，分别有27及77个基因差异表达。结论紫杉醇可诱导MCF-7细胞周期阻断在G₂/M期并引起部分细胞凋亡，该作用与药物浓度有关。基因表达谱分析显示部分差异表达基因参与细胞微管及骨架结构、细胞周期调控、以及DNA损伤修复和凋亡过程。