银杏外种皮多糖对HL-60细胞的体外实验研究

目的:研究银杏外种皮多糖对体外HL-60细胞的作用。方法:运用MTT方法和流式细胞技术,检测HL-60细胞体外增殖、凋亡以及相关基因的表达。结果:银杏外种皮多糖(40～160mg/L,48h)可抑制HL-60细胞增殖及增殖促进基因c-myc的表达,可诱导HL-60细胞凋亡并下调凋亡抑制基因bcl-2的表达。结论:银杏外种皮多糖对HL-60细胞增殖及凋亡的影响涉及增殖促进基因c-myc和凋亡抑制基因bcl-2。

维甲酸诱导HL-60细胞分化过程中端粒酶活性与hTERT,c-myc和bcl-2表达的研究

为了探讨全反式维甲酸 (ATRA)诱导HL 60细胞分化过程中端粒酶活性与hTERT ,c myc和bcl 2mRNA表达的变化规律及其意义 ,复制HL 60细胞的诱导分化模型 ,在分化前和分化过程中通过端粒重复序列扩增PCR ELISA方法测定端粒酶活性 ,采用RT PCR方法检测hTERT ,c myc和bcl 2mRNA表达水平。结果显示 ,在ATRA诱导HL 60细胞分化过程中 ,端粒酶活性水平逐渐下降 ,hTERTmRNA表达下调的同时c myc和bcl 2mRNA表达亦下调 ,且hTERTmRNA下调早于端粒酶活性水平下降。结论 :全反式维甲酸诱导的HL 60细胞分化过程与端粒酶活性降低和hTERT ,c myc及bcl

昆明山海棠根部水提液诱导HL-60细胞凋亡及对c-Myc基因表达的调控(英文)

目的 研究昆明山海棠 Tripterygium hypoglaucum(Celastraceae) (THH)根部水提液对早幼粒白血病HL- 6 0细胞凋亡的诱导作用及机制。方法 通过特征性的形态学观察 ,Annexin- V标记 ,以及流式细胞仪检测中次G1 峰的形成确定 THH的诱导细胞凋亡作用 ;应用 Western Blotting研究 THH对 c- Myc蛋白表达的影响。结果THH根部水提液可诱导早幼粒白血病 HL - 6 0细胞凋亡。在浓度高于 18μg/ m L时 ,THH对 HL - 6 0细胞的诱导凋亡作用呈现浓度与时间的相关性。在 THH处理 2～ 4 h后 ,癌基因蛋白 c- Myc表达降低 99%以上。结论 THH抑制了 c- Myc蛋白的翻译或后翻译过程 ,从而降低了 c- Myc在细胞周期运转中的作用 。

六亚甲基二乙酰胺对HL-60细胞细胞周期及其调节蛋白表达的影响

六亚甲基二乙酰胺 (hexamethylenebisacetamide ,HMBA)是一种极性诱导分化剂 ,已应用于临床治疗急性髓系白血病和骨髓增生异常综合征 (MDS) ,但其诱导髓系白血病细胞分化的机制尚不清楚。本研究观察了HMBA对HL 60白血病细胞细胞周期及其调节蛋白表达的影响 ,以探讨其药理机制。用流式细胞术检测HMBA对HL 60细胞细胞周期分布和细胞周期蛋白D、E及p2 7表达的影响 ,用RT PCR研究HMBA对细胞周期负性调控分子CKIp15,p16,p2 7基因mRNA表达的影响。结果表明 ,HMBA主要使HL 60细胞阻滞于G0 /G1期 ,经HMBA处理后HL 60细胞胞浆内细胞周期蛋白E蛋白表达显著降低 ,而细胞周期蛋白D和p2 7蛋白表达则显著增高 ;未经HMBA处理的HL 60细胞 p15,p16mRNA均无表达 ;3mmol/LHMBA处理 2 4小时后 p15mRNA出现弱阳性条带 ,48小时和 72小时后出现强阳性条带 ,p16mRNA则在 48小时后出现弱阳性条带 ,72小时后出现强阳性条带 ;p2 7mRNA在未经处理和处理后 2 4,48和 72小时后均出现强阳性条带 ,阳性程度无明显差异。结论 :HMBA的药理机制之一可能是通过下调细胞周期蛋白E ,上调p2 7蛋白的表达 ,同时使得 p15,p16基因mRNA重获表达 ,阻滞HL 60细胞周期于G1期 。

bFGF和VEGF在急性白血病中的表达及对HL-60细胞生长的影响

为了研究急性白血病患者血清及细胞株培养上清中碱性成纤维细胞生长因子 (bFGF)、血管内皮细胞生长因子 (VEGF)的表达水平 ,并初步探讨白血病患者VEGF水平的评价方法以及VEGF特异性反义寡脱氧核苷酸(ASODN)的抗血管生成作用 ,用夹心ELISA法测定患者血清、细胞株 (HL 6 0、U937、NB4、JM和K5 6 2 )培养上清中bFGF和VEGF浓度 ,比较其差异 ,将VEGF血清浓度测定值 (pg ml)、血清浓度测定值经外周血血小板计数标化后标化值VEGF PLT(pg 10 6 )分别作为比较指示 ;HL 6 0细胞经不同浓度VEGFASODN作用后 ,利用噻唑蓝、ELISA法分别测定靶细胞的生长状态及其VEGF分泌水平。结果发现 :①急性白血病患者血清bFGF阳性率 (37.5 % )高于健康对照者 (10 % ) (P <0 .0 1) ,在 5株白血病细胞株中 ,NB4 、U937和K5 6 2细胞上清中检测到了bFGF表达 ;②急性白血病患者及健康者血清VEGF测定值差异无统计学差异 ,但二者标化值测相差显著 (P <0 .0 5 ) ;除U937外 ,其余 4株细胞株培养上清中均有VEGF表达 ;③HL 6 0细胞经 0 .5 ,1及 5 μmol LVEGFASODN作用 2 4小时后 ,其存活率与对照组相比明显降低 (P <0 .0 5 ) ;经 1,5 ,2 0 μmol LVEGFASODN作用 2 4小时后 ,HL 6 0细胞培养上清中VEGF浓度均明显低于对照 (P <0 .0 5 )。结论 :

新型氨基甾体类对人粒系白血病HL-60细胞系的增殖抑制和分化诱导的作用(英文)

研究发现一种新型氨基甾体化合物,2β-(4’-甲基-1’-哌嗪基)-3α,17β二羟基-5α-雄甾烷(HY)可抑制HL-60细胞的增殖,并诱导该类细胞向巨噬样细胞分化。其主要证据如下:①细胞计数,集落计数及MTT检测显示抑制HL-60细胞的增殖;②液体培养6天后形态学显示诱导HL-60细胞向巨噬样细胞分化;③可诱导NBT反应阳性;④可诱导α-萘酚醋酸酯酶反应阳性;⑤流式细胞术显示可诱导CD11b和CD14的表达。结论提示该化合物具有治疗白血病的潜在价值。

环孢菌素A诱导人白血病HL-60细胞株凋亡机制的研究

目的:观察环抱菌素A对人白血病HL-60细胞株凋亡的影响及其作用机制。方法:采用瑞氏染色、流式细胞仪、TUNEL法观察环孢菌素A对HL-60细胞株凋亡的影响;采用流式细胞仪检测环孢菌素A影响HL-60细胞凋亡时bcl-2基因表达的改变情况。结果:20mg/L环孢菌素A作用6h可诱导HL-60细胞凋亡,瑞氏染色呈现典型的凋亡形态学改变,流式细胞仪显示凋亡峰。细胞周期分析发现,环孢菌素A可使HL-60细胞生长阻滞于G_0-G_1期。环孢菌素A处理组的凋亡率高于对照组(P<0.01)。环孢菌素A处理组的bcl-2蛋白阳性率低于对照组(P<0.01)。结论:环孢菌素A可诱导HL-60细胞株凋亡,其机制可能是通过下调bcl-2基因表达。

半边旗抗肿瘤有效成分6F对HL-60细胞的DNA、RNA及蛋白质生物合成的抑制作用

目的 :从 DNA、RNA及蛋白质生物合成的角度探讨半边旗有效成分 6F抗肿瘤的作用机理。方法 :用台盼蓝拒染法测定细胞成活率 ;[3H] - Td R,[3H] - UTP和 [3H] - Leu参入法分别测定细胞 DNA、RNA及蛋白质生物合成的水平。结果 :6F对 HL - 60细胞生长有强烈的抑制作用 ,且具明显的时间和剂量效应关系。 6F明显抑制 HL- 60细胞 DNA、RNA及蛋白质生物合成 ,呈剂量依赖关系。 6 F对蛋白质合成的抑制作用最强。结论 :6F对 HL- 60细胞生长有强烈的抑制作用 ,抑制细胞 DNA、RNA,特别是蛋白质的生物合成是 6F抗肿瘤作用的可能机制之一。

半边旗提取物6F对HL-60细胞还原型谷胱甘肽(GSH)水平的影响

目的 :观察半边旗提取物 6F对 HL- 60细胞内还原型谷胱甘肽 (GSH)水平的影响 ,从氧化机制探讨其抗肿瘤作用的机理。方法 :用邻苯二醛 (OPT)荧光分光度法测定细胞内还原型谷胱甘肽。结果 :58至 2 31 nmo1 / L 6F作用细胞 2 0 h及 2 31 nmo1 / L 6F作用细胞 6至2 4 h,HL - 60细胞内 GSH含量均明显降低 ,呈明显的时间剂量效应关系。结论 :化合物 6F可降低 HL- 60细胞内还原型谷胱甘肽水平 ,推测通过细胞内氧化机制杀伤 HL- 60细胞并诱导其细胞凋亡是化合物 6F抗肿瘤作用机制之一。

Bcl-x基因在紫杉醇诱导的HL-60细胞凋亡过程中的变化

目的 研究抗微管药紫杉醇诱导HL - 6 0细胞凋亡过程中Bcl -x基因表达的变化。方法 用RT -PCR法检测药物孵育前后Bcl-x基因的表达水平。结果 在紫杉醇诱导HL - 6 0细胞凋亡过程中 ,Bcl-x1基因表达水平下降 ,而Bcl-xs 基因表达水平升高。结论 Bcl-x基因参与了紫杉醇诱导的HL - 6 0细胞凋亡的调控。

Antileukemic activity of jaspolide B,an isomalabaricane-type triterpene from marine sponge Jaspis sp. on human promyeloleukemic HL-60 cells

The antiproliferative activity and underlying mechanisms of jaspolide B, an isomalabaricane-type triterpene, isolated from the sponge Jaspis sp., were investigated using human promyeloleukemic HL-60 cells. Jaspolide B arrested HL-60 cells in the G2/M phase of the cell cycle and induced apoptosis of HL-60 cells in a dose- and time-dependent manner. Moreover, the poly （ADP-ribose） polymerase （PARP） protein was cleaved by jaspolide in a dose- and time-dependent way. Jaspolide B with an ICs0 value of 0.61 μmol/L was found to be comparable efficacy as that of paclitaxel （IC50：0.78 μmol/L）. These results implicate the potential ofjaspolide B as a promising anticancer agent in chemotherapy of leukemia by arresting cell cycle progression at G2/M phase and triggering apoptosis.

Polymethylenebis [acetamides] Analogues.Synthesis and Differentiation-Inducing Activity on HL-60 Cells

报导了一系列多亚甲基双［酰胺］类化合物的合成，由－摩尔多亚甲基二甲酰氯分别和二摩尔２－氨基噻唑啉及５－氨基－１－甲基吡啶酮反应制得。测定了其体外对ＨＬ－６０人早幼粒白血病细胞的分化诱导活性，初步结果表明：Ｎ，Ｎ｀－双吡啶酮基六二甲酰胺和Ｎ，Ｎ｀－双噻唑啉基八亚甲基二甲酰胺分别在０．１ｍｍｏｌ／Ｌ和０．５ｍｍｏｌ／Ｌ浓度时，诱导分化百分率可达６０％。此浓度下细胞存活率分别为２６％及２２％，其有效诱导浓度比ＨＭＢＡ低十倍。

Effect of Bcl-2 and caspase-3 on calcium distribution in apoptosis of HL-60 cells

Apoptosis manifests in two major execution programs downstream of the death signal: the caspase pathway and organelle dysfunction. An important antiapoptosis factor, Bcl-2 protein, contributes in caspase pathway of apoptosis. Calcium, an important intracellular signal element in cells, is also observed to have changes during apoptosis, which maybe affected by Bcl-2 protein. We have previously reported that in Harringtonine (HT) induced apoptosis of HL-60 cells, there’s a change of intracellular calcium distribution, moving from cytoplast especially Golgi’s apparatus to nucleus and accumulating there with the highest concentration. We report here that caspase-3 becomes activated in HT-induced apoptosis of HL-60 cells, which can be inhibited by overexpression of Bcl-2 protein. No sign of apoptosis or intracellular calcium movement from Golgi’s apparatus to nucleus in HL-60 cells overexpressing Bcl-2 or treated with Ac-DEVD-CHO, a specific inhibitor of caspase-3. The results indicate that activated caspase-3 can promote the movement of intracellular calcium from Golgi’s apparatus to nucleus, and the process is inhibited by Ac-DEVD-CHO (inhibitor of caspase-3), and that Bcl-2 can inhibit the movement and accumulation of intracellular calcium in nucleus through its inhibition on caspase3. Calcium relocalization in apoptosis seems to be irreversible, which is different from the intracellular calcium changes caused by growth factor.

A novel thioredoxin reductase inhibitor inhibits cell growth and induces apoptosis in HL-60 and K562 cells

Human thioredoxin reductase (TrxR) system is associated with cancer cell growth and anti-apoptosis process. Effects of 1,2-bis(1,2-benzisoselenazolone-3(2H)-ketone)ethane (BBSKE),a novel TrxR inhibitor,were investigated on human leu-kemia cell lines HL-60 and K562. BBSKE treatment induced cell growth inhibition and apoptosis in both cell lines. Apoptosis induced by BBSKE is through Bcl-2/Bax and caspase-3 pathways. Ehrlich's ascites carcinoma-bearing mice were used to inves-tigate the anti-tumor effect of BBSKE in vivo. Tumor-bearing mice treated with BBSKE showed an increase of life span with a comparable effect to cyclophosphamide (CTX). These results suggest a potential usage of BBSKE as a therapeutic agent against non-solid tumors.

Altered expression of nuclear matrix proteins in etoposide induced apoptosis in HL-60 cells

The events of cell death and the expression of nuclear matrix protein (NMP) have been investigated in a promyelocytic leukemic cell line HL-60 induced with etoposide. By means of TUNEL assay, the nuclei displayed a characteristic morphology change, and the amount of apoptotic cells increased early and reached maximun about 39% after treatment with etoposide for 2 h. Nucleosomal DNA fragmentation was observed after treatment for 4 h. The morphological change of HL-60 cells, thus, occurred earlier than the appearance of DNA ladder. Total nuclear matrix proteins were analyzed by 2-dimensional gel electrophoresis. Differential expression of 59 nuclear matrix proteins was found in 4 h etoposide treated cells. Western blotting was then performed on three nuclear matrix acssociated proteins, PML, HSC70 and NuMA. The expression of the suppressor PML protein and heat shock protein HSC70 were significantly upregulated after etoposide treatment, while NuMA, a nuclear mitotic apparatus protein, was down regulated. These results demonstrate that significant biochemical alterations in nuclear matrix proteins take place during the apoptotic process.

ANTI-PROLIFERATION EFFECT OF ORIDONIN ONHL-60 CELLS AND ITS MECHANISM

ObjectiveTo investigate the anti-proliferation effect of oridonin on leukemic HL-60 cells and its mechanism. Methods HL-60 cells invitroin culture medium were given different concentrations of oridonin. The inhibitory rate of cells were measured by microculture tetrazolium (MTT) assay, cell apoptotic rate was detected by flow cytometry (FCM),morphology of cell apoptosis was observed by hoechst 33258 fluorescence staining, and the activity of telomerase was det-ected using telomere repeat amplification protocol (TRAP) PCR-ELISA before and after apoptosis occurred. Results Oridonin could decrease telomerase activity, inhibit growth of HL-60 cells, and cause apoptosis significantly. The suppression was both in time- and dose-dependent manner. Marked morphological changes of cell apoptosis including condensation of chromatin and nuclear fragmentation were observed clearly by hoechst 33258 fluorescence staining especi-ally after cells were treated 48-60 hours by oridonin. Conclusions Oridonin has apparent anti-proliferation and apoptotic effects on HL-60 cells invitro, decreasing telomerase activity of HL-60 cells may be one of its most important mechanisms. These results will provide strong laboratory evidence of oridonin for clinical treatment of acute leukemia.

Correlation between inhibition of calcium-dependent apoptosis by cyclosporin A and calcium transportation in HL-60 cells

Both calcium ionophore A23187 and endoplasmic reticulum Ca2+- ATPase inhibitor thapsigargin (Tg) could increase intracellular free calcium concentration and induce apoptosis in some cell lines. In the present study, we found that HL-60 cells treated with A23187 (1μg/ml) for 4 h or with Tg (0.5μg/ml) for 2 h showed typical characteristics of apoptosis. Pretreatment with nontoxic concentration of cyclosporin A (CsA) (1μg/ml) Could block these effects. Flow cytometric analysis of intracellular Ca2+ after staining with fluo-3 AM showed that CsA did not prevent the increase of intracellular calcium induced by A23187 or Tg, but it could maintain the high level of intracellular Ca2+ for a long time. These results suggest that CsA may prevent calcium- induced apoptosis by blocking the transportation of Ca2+ in HL-60cells.

Ethanolic extract of propolis induces apoptosis of HL-60 cells in vitro

Objective The aim of the study was to investigate whether ethanolic extract of propolis inhibits the growth and induces apoptosis of HL-60 cel s. Methods HL-60 cel s were treated for 24, 48, 72 h with various concentrations ethanolic extracts of prop-olis （0, 50, 100, and 200 μg/mL）. The proliferation of HL-60 cels was determined using the 3-（4,5-dimeth-ylthiazol-2-yl）-2,5-diphenyltetrazolium bromide （MTT） assay. Subsequently, Hochest 33258 staining and terminal deoxynucleotidyl transferase dUTP nick end labeling （TUNEL） were used to test the apoptosis of HL-60 cel s. We observed the expression levels of Bax and Bcl-2 in HL-60 cel s by immunohistochemistry. Results MTT assay showed that various concentrations of ethanolic extract of propolis had significant inhibitory efect on HL-60 cel proliferation （P〈 0.05）. Typical morphologic changes could be observed by fluorescence microscope and TUNEL. By immunohistochemistry, we found the expression level of Bax was up-regulated, whereas that of Bc1-2 was down-regulated （P 〈 0.05）.Conclusion Ethanolic extract of propolis inhibits leukemia cel proliferation and induces apoptosis in vitro. Its mechanism may be related to the regulation of Bax and Bcl-2 expression and up-regulation of Bcl-2/Bax ratio.

The up-regulated differentially expressed genes in HL-60 cell line treated with nocodazole

Objective：Microtubule damaging agents such as nocodazole have been used in the clinical cancer chemotherapy. However, the molecular mechanisms of apoptosis induction activity of these agents are still unclear. We previously demonstrated that nocodazole induced apoptosis in human leukemic HL-60 cells. In order to investigate the genes involved in this process, cDNA RDA was performed to identify upregulated genes in the apoptosis process induced by nocodazole. Methods ：Sixteen up-regulated genes were identified and confirmed to be differentially expressed, including ribosomal proteins, cytochrome b, Wilm＇s tumor related protein QM gene, alpha-tubulin isoform 1, heterogeneous nuclear ribonucleoprotein C enzymes, follicular lymphoma variant translocation 1, Ribophorin I , etc. Results：It was the first time for several genes reported to be related to apoptosis, including one functionally unkown gene, BING4. We also analyzed the expression of these genes in apoptosis induced by etoposide, and results showed 9 genes were also up-regulated, indicating they could be important genes involved in apoptosis. Conclusion：The study provides important clues to understand mechanism of apoptosis induced by nocodazole, and establishes foundation for further study.