Effects of Triptolide on Cell Proliferation and CXCR4 Expression in Burkitt’s Lymphoma Raji Cells In Vitro

Objective： To investigate the inhibitory effects of triptolide on cell proliferation and CXCR4 expression in Burkitt＇s lymphoma cell line Raji cells. Methods： The effects of triptolide on the growth of Raji cells were studied by 3-（4, 5-Dimethyl-2-thiazolyl）-2, 5-diphenyl-2H-tetrazolium（MTT） assay. The effects of triptolide on CXCR4 expression on Raji cells were studied by flow cytometric analysis. Chemotaxis assays were performed to observe the effects of triptolide on migration of Raji cells towards recombinant human SDF-1α （rhSDF-1α） in vitro. Results： Triptolide inhibited the proliferation of Raji cells in a dose- and time-dependent way with a 24-h IC50 value of 43.06 nmol/L and a 36-h IC50 value of 25.08 nmol/L. Triptolide could downregulate the CXCR4 expression on Raji cells in a dose-dependent manner. Furthermore, chemotaxis assays showed that triptolide could block the migration of Raji cells to rhSDF-1α in vitro, and the inhibition was dose-dependent. Conclusion： Triptolide could inhibit the proliferation and migration of Raji cells in vitro. The underlying anti-tumor mechanism of triptolide might be related to the anti-proliferative effect and the blockage of SDF-1/CXCR4 axis.

ENHANCEMENT OF RADIATION-INDUCED APOPTOSIS IN RAJI CELL LINE BY BC1-2 ANTISENSE OLIGODEOXYNUCLEOTIDE

Objective: To investigate whether the Bc1-2 antisense oligonucleotide(ASODN) may enhance radiation-induced apoptosis in Raji cell line. Methods: Cell surviving fraction was determined using the trypan blue dye exclusion assay. The expression level of bc1-2 protein was assayed by immunofluorescence using fluoresce isothiocyanate label. Apoptosis was detected by Giemsa staining and flow cytomertric cell cycle analysis. Results: It was found that Bc1-2 ASODN combined with radiation had significantly reduced the number of viable cells (P<0.05). There was no difference on cell survival between mismatch Bc1-2 oligodeoxynucleotide/radiation combination and radiation-treated cells alone. Bc1-2 ASODN combined with radiation could significantly inhibit expression of Bc1-2 protein in Raji cells (P<0.05). Cells treated with Bc1-2 ASODN combined with radiation at 72 h displayed classic apoptotic changes. Apoptosis rates of Raji cells treated with Bc1-2 oligodeoxynucleotide/radiation combination and radiation-treated cells alone, respectively. Conclusion: Bc1-2 antisense oligonucleotide can enhance radiation-induced apoptosis in Raji cell line.

Combined transfection of Bcl-2 siRNA and miR-15a oligonucleotides enhanced methotrexate-induced apoptosis in Raji cells

Objective: B-cell lymphoma 2 (Bcl-2) is an important member of the Bcl-2 family of proteins that regulate the induction of apoptosis. This study aims to investigate whether Bcl-2 small interfering RNA (siRNA) combined with miR-15a oligonucleotides (ODN) could enhance methotrexate (MTX)-induced apoptosis in Raji cells. Methods: Chemically synthesized miR-15a ODN and Bcl-2 siRNA were transfected in Raji cells by using a HiPerFect Transfection Reagent and then combined with MTX. Expression levels of Bcl-2 protein were detected by Western blot. Cell proliferation was determined by CCK8 assay. The rate of cell apoptosis was determined by Annexin V/PI double staining. The morphology of apoptotic cells was observed by Hoechst-33 258 staining. Results: After the cells were transfected with miR-15a ODN combined with Bcl-2 siRNA, Bcl-2 protein levels were evidently decreased. CCK8 assay showed that cell proliferation was significantly decreased and was significantly lower in miR-15a ODN combined with Bcl-2 siRNA plus MTX group than in miR-15a ODN with methotrexate group, Bcl- 2 siRNA with MTX group, and single MTX group (P<0.05). Hoechst 33258 staining revealed numerous apoptotic cells. AnnexinV/PI double staining showed that the apoptotic rates were (13.13±1.60)%, (34.47±2.96)%, (32.87±3.48)%, and (45.47±2.16)% in MTX, Bcl-2 siRNA plus MTX, miR-15a ODN plus MTX, and miR-15a ODN combined with Bcl- 2 siRNA plus MTX groups, respectively. Among these groups, the apoptotic rate of miR-15a ODN combined with Bcl-2 siRNA plus MTX group was the highest; this apoptotic rate was also significantly different from that of miR-15a ODN or Bcl-2 siRNA plus MTX (P<0.05). Conclusions: Bcl-2 siRNA combined with miR-15a ODN could enhance MTX-induced apoptosis in Raji cells. Bcl-2 siRNA and miR-15a combined with MTX may be a useful approach to improve the treatment effects on lymphoma.

Small hairpin RNA against Bcl-2 increases MTX-induced apoptosis in Raji cells

Objective:The aim of this study was to study the effect of Bcl-2 small hairpin RNA(shRNA) enhancing methotrexate(MTX)-induced apoptosis of Raji cells.Methods:Expression plasmid with Bcl-2 shRNA was transfected into Raji cells by Lipofectmine 2000 and then treated with MTX.At 48 h of transfection,the expression level of Bcl-2 mRNA and protein was evaluated by RT-PCR and immunofluorescence.MTT assay was used to analyze cell proliferation at 24,48 and 72 h.Apoptosis was detected by Giemsa staining and flow cytometric cell cycle analysis.Results:After transfection with Bcl-2 shRNA,the expression levels of Bcl-2 mRNA and protein in Raji cells decreased(P < 0.05).Using Giemsa staining,cells transfected with Bcl-2 shRNA combined with MTX at 48 h displayed changes of apoptosis.MTX significantly inhibited the growth of cells after transfected with Bcl-2 shRNA(P < 0.05).Apoptotic rates of the Raji cells treated with Bcl-2 shRNA combined with MTX significantly increased(P < 0.05),compared with either control shRNA/MTX combination or MTX-treatment cells alone.Conclusion:Our results suggest the shRNA against Bcl-2 mRNA could increase MTX-induced apoptosis of Raji cells.

GROWTH-INHIBITORY EFFECTS OF CURCUMIN ON Raji CELLS AND ITS MECHANISMS

Objective： To study the growth-inhibitory effects of curcumin on B-NHL cell line Raji cells in vitro and its molecular mechanisms. Methods： The growth inhibition rates of Raji cells, after being treated with 6.25μmol/L - 50μmol/L curcumin for 12 h - 48 h, were examined by MTT assay. The apoptosis rate was detected by flow cytometry （FCM）, the protein expression levels of bcl-2 and p53 in Raji cells were examined by SP immunohistochemistry. The expression of p53 in Raji cell were checked by RT-PCR. Results： After being treated by various concentrations of curcumin, the growth of Raji cells was inhibited significantly. The rates of apoptosis were 11.8% -79.7% （P〈0.01）, the down regulation of p53 expression was observed within 24 h after the treatment of curcumin by RT-PCR. The expression of bcl-2 and p53 was decreased, which depended on the action time. Conclusion： Curcumin could significantly inhibit the growth of Raji cells. The induction of apoptosis by down-regulating the expression of bcl-2 and p53 was probably one of its molecular mechanisms.

The study of miR-15a oligonucleotide inhibiting cell growth and enhancing Ara-C-induced apoptosis in Raji cells

Objective:The aim of the research was to study whether microRNA-15a(miR-15a) oligonucleotide could inhibit cell growth and enhance cytarabine(Ara-C)-induced apoptosis in Raji cells.Methods:Transfecting miR-15a oligonucleotide into Raji cells with LipofectamineTM 2000,and then combined with Ara-C.IC50 value and cell proliferation were detected by CCK8 assay;the expression levels of Bcl-2 mRNA and protein were evaluated by RT-PCR and indirect immuno-fluorescence.The apoptotic cells were observed by Hoechst Dyeing;AnnexinV/PI double dyeing method was used to detect the cell apoptotic rate by Flow Cytometry(FCM).Results:After Raji cells were transfected with miR-15a oligonucleotide for 48 h,Bcl2 protein expression levels obviously decreased,however,there was no difference in Bcl-2 mRNA levels,as compared with the control group and blank group(P < 0.05).CCK8 assay showed that miR-15a oligonucleotide decreased the cell growth at 24,48 and 72 h,moreover,miR-15a oligonucleotides combined with Ara-C obviously decreased the cell growth than miR-15a group,Ara-C group and scrambled oligonucleotides(SODN) + Ara-C group.Meanwhile,miR-15a oligonucleotides combined with Ara-C significantly decreased IC50 of Ara-C(10.41 μg/mL),which were obviously lower than those of Ara-C group(15.43 μg/mL) and SODN plus Ara-C group(14.92 μg/mL).Plenty of apoptotic cells could be seen with Hoechst dyeing.AnnexinV/PI double dying assays by FCM indicated that the cell apoptotic rates in earlier period and late period of miR-15a + Ara-C group were 20.93% and 25.27%,respectively,which were obviously higher than those of miR-15a group,Ara-C group and SODN plus Ara-C group.Conclusion:miR-15a oligonucleotides can inhibit cell growth and enhance Ara-C-induced apoptosis in Raji cells.

环状RNA hsa_circ_0006156在系统性红斑狼疮患者外周血中的表达及其对Raji细胞增殖、凋亡的影响

目的:研究hsa_circ_0006156对Raji细胞增殖、凋亡的影响及其在系统性红斑狼疮(SLE)发生、发展中的作用。方法:收集广西医科大学第一附属医院皮肤性病科2021年9月至2023年9月收治的55例SLE患者(SLE组),并以40例健康对照者作为对照组(HC组),分离出外周血单个核细胞(PBMC)及CD20+B淋巴细胞,使用实时荧光定量聚合酶链反应(RT-qPCR)法检测hsa_circ_0006156表达水平;采用受试者工作特征曲线(ROC)分析hsa_circ_0006156的诊断效能。以Raji细胞为研究对象,使用慢病毒构建hsa_circ_0006156过表达模型,将细胞分为hsa_circ_0006156过表达组(OE组)、转染空病毒载体的阴性对照组(NC组)以及空白对照组(control组)。利用CCK8法检测0 h、6 h、12 h、18 h、24 h、30 h、36 h细胞450 nm吸光度,计算OE组和NC组增殖率。Western blotting实验检测各组Bcl-2、cleaved caspase-3凋亡蛋白表达水平。结果:与HC组比较,SLE组PBMC和CD20+B淋巴细胞中hsa_circ_0006156表达量均明显降低(P<0.001)。ROC曲线分析显示,hsa_circ_0006156区分SLE和HC的ROC曲线下面积(AUC)为0.787 3(95%CI:0.697 5~0.877;P<0.001),敏感度为97.5%,特异度为50.9%,对SLE诊断Cut-off值为<0.652。hsa_circ_0006156表达量在无活动或轻度活动与中重度活动患者之间存在显著差异(P=0.0148)。CCK8实验结果显示,在36 h时,OE组Raji细胞增殖较NC组受到明显抑制(P<0.001)。Western blotting检测结果表明,与NC组和control组比较,OE组Bcl-2蛋白表达水平降低,而cleaved caspase-3蛋白表达水平升高(均P<0.05)。结论:hsa_circ_0006156对SLE具有一定的诊断效能。hsa_circ_0006156可能是通过调节B细胞的增殖、凋亡影响SLE的发生、发展。

CHFR基因和PARP-1基因对裸鼠Raji淋巴瘤细胞增殖和凋亡调控的研究

目的CHFR基因是一种抑癌基因,低表达或表达缺失可能促淋巴瘤细胞增殖,PARP-1基因参与其对淋巴瘤细胞增殖的调控,本研究旨在通过过表达CHFR基因及分别沉默CHFR、PARP-1基因,观察其对裸鼠移植瘤Raji细胞的影响,探讨CHFR基因和PARP-1基因调控裸鼠Raji淋巴瘤细胞的增殖和凋亡机制。方法在非霍奇金B细胞裸鼠Burkitt淋巴瘤移植瘤Raji细胞中,用5-氮杂-2′-脱氧胞苷(5-Aza-dC)过表达CHFR基因,及用慢病毒介导的shRNA分别沉默CHFR、PARP-1基因,测定各组裸鼠移植瘤的肿瘤的大小及重量;采用实时荧光定量PCR技术测定各组CHFR及PARP-1基因mRNA含量;应用MSP方法检测各组CHFR的甲基化状态;分别通过TUNEL试剂盒和免疫组化监测凋亡指数(AI)和微血管密度(MVD)。结果5-Aza-dC组的裸鼠在非霍奇金B细胞Burkitt淋巴瘤移植瘤Raji细胞能增强CHFR基因mRNA的表达,降低PARP-1基因mRNA的表达;在体内环境中,5-Aza-dC能够促进移植瘤Raji细胞的凋亡,抑制移植瘤的生长(P<0.05),这些结果与shRNA-CHFR组结果相反,与shRNA-PARP-1组结果一致。而且实验中可见5-Aza-dC组的裸鼠移植瘤的CHFR基因发生去甲基化。结论CHFR基因低表达促进肿瘤细胞增殖,PARP-1基因低表达促进肿瘤细胞凋亡,而5-Aza-dC可以去甲基化抑制肿瘤细胞增殖。

Effect of adenovirus-mediated p27 gene expression on the proliferation and apoptosis of HL-60 and Raji cell lines

Background p27 is an essential mediator of cell cycle control,which plays a key negative role in the proliferation and tumorigenesis of certain cell types. Here, we designed this study to explore the possible effects of p27 on the proliferation and apoptosis of HL-60 and Raji cell lines.Methods HL-60 and Raji cells were transfected with p27 via an adenovirus-mediated approach. The efficiency of Adp27 infection and the expression of p27 mRNA and protein were evaluated by X-gal staining, RT-PCR, and flow cytometry. The proliferation and apoptosis of HL-60 and Raji cells were estimated by means of trypan blue staining, MTT assay, Annexin V/PI, and DNA ladder electrophoresis. Results The infection efficiencies in HL-60 and Raji cells were 40.3% and 32.0%, respectively. RT-PCR and flow cytometry showed that there was significant expression of p27 mRNA and protein in HL-60 and Raji cells infected with Adp27; on the other hand, uninfected HL-60 cells showed faint traces of p27 mRNA and protein and Raji cells showed nearly no signs of p27 mRNA and protein. As demonstrated by a cell growth curve and by an MTT assay, strong time-dependent proliferation inhibition was apparent in HL-60 and Raji cells infected by Adp27. After 72 hours of infection, the Annexin V+/PI- apoptotic cell rates in HL-60 and Raji cell lines were 46.9% and 35.7%, respectively, significantly higher than in the control groups (4.7% and 5.6%, respectively). Typical DNA ladder bands were detectable in HL-60 and Raji cells after 48 hours of Adp27 infection. Conclusions Adenoviral vector-mediated p27 gene transfection of HL-60 and Raji cells leads to the inhibition of cellular proliferation and the promotion of cell apoptosis. This technique may provide an approach to gene therapy for leukemia or lymphoma.

EGCG单用/与CAR-T疗法联合应用对Raji细胞杀伤、THP-1细胞炎症因子mRNA表达抑制作用

目的观察表没食子儿茶素没食子酸酯(EGCG)单用/与嵌合抗原受体T细胞(CAR-T)疗法联合应用对人Burkitt’s淋巴瘤细胞株Raji杀伤、人单核细胞白血病细胞系THP-1炎症因子mRNA表达抑制作用。方法取对数生长期的Raji细胞,并分为4组,对照组为单纯Raji细胞,Raji+CAR-T组加入CAR-T,Raji+EGCG组加入EGCG,Raji+CAR-T+EGCG组加入CAR-T和EGCG,荧光素酶化学发光法和Annexin V-FITC染色法检测各组细胞相对活力及杀伤效率;取对数生长期的人单核细胞白血病细胞(THP-1细胞),并分为对照组、模型组、EGCG组,其中模型组和EGCG组加入LPS(终浓度1μg/mL)诱导炎症模型,同时EGCG组加入EGCG(浓度为100μmol/mL)干预,采用实时荧光定量PCR法检测COX-2、IL-6、IL-8、TNF-αmRNA相对表达量。结果Raji+CAR-T+EGCG组、Raji+EGCG组、Raji+CAR-T组、对照组细胞相对活力分别为52.93±4.61、91.67±6.79、51.26±2.61、100.00±5.45,对照组与其余3组比较,Raji+CAR-T+EGCG组、Raji+EGCG组比较,P均<0.05。Raji+CAR-T组、Raji+EGCG组、Raji+CAR-T+EGCG组的杀伤效率分别为10.29%、16.21%、16.65%,对照组与其余3组比较,Raji+CAR-T组、Raji+CAR-T+EGCG组比较,P均<0.05。EGCG组COX-2、IL-6、IL-8、TNF-αmRNA相对表达量分别为1.49±0.20、2.09±0.91、5.25±0.36、1.07±0.42,模型组分别为7.06±0.72、34.25±9.98、6.97±0.58、6.64±1.71,对照组分别为1、1、1、1,模型组与其余两组比较,P均<0.05。结论EGCG不仅可以提升CAR-T活力,并减缓其耗竭,同时在不影响CAR-T杀伤能力和效率的前提下,抑制Raji细胞增殖及多种炎症因子表达。

通关藤提取物体外对Jurkat、Raji、RPMI8226细胞的抑制作用研究

目的探讨通关藤提取物对Jurkat、Raji、RPMI8226细胞的抑制作用及可能机制。方法以不同浓度通关藤提取物处理Jurkat、Raji、RPMI8226细胞,MTT法检测其对3种细胞的抑制作用,Annexin V/PI双染法观察细胞形态并检测细胞的凋亡率,JC-1染色法检测细胞线粒体跨膜电位(ΔΨm)水平。结果通关藤提取物对Jurkat细胞的抑制作用最强,对RPMI8226细胞最不敏感。25,50μL/mL的通关藤提取物能降低Jurkat、Raji细胞内ΔΨm,并促进其凋亡。100μL/mL的通关藤提取物也可降低RPMI8226细胞ΔΨm而诱导其凋亡。结论通关藤提取物体外对部分淋巴细胞白血病细胞株和骨髓瘤细胞株有不同程度的诱导凋亡作用,可能是通过降低ΔΨm途径触发这些细胞凋亡。

MBL与Raji细胞结合特性的研究

甘露聚糖结合凝集素(MBL)作为关键的天然免疫模式识别分子已得到共识,但其在获得性免疫应答中是否发挥作用目前尚不清楚.采用酶联免疫吸附试验分析MBL能否与Raji、THP1/CD14、Jurkat和红细胞结合,并采用流式细胞术着重研究其与Raji细胞结合特性.结果显示:MBL以浓度依赖方式结合Raji、THP1/CD14、Jurkat细胞,红细胞则否.MBL与Raji细胞结合是Ca2+依赖的,且能被甘露糖、葡萄糖、N-乙酰葡糖胺所抑制;C1q或抗C1qR单克隆抗体能部分抑制MBL与Raji细胞结合;重组人MBL-CRD蛋白或MBL-CLR蛋白均能抑制MBL与Raji细胞结合,两者联合应用则可完全阻断这种结合.研究资料表明,B淋巴细胞系Raji细胞表达Ca2+依赖性、糖敏感的MBL受体,包括对CLR特异和CRD特异的两种受体,前者为MBL和C1q的共同受体.进一步的功能研究显示,高浓度MBL(10～50mg/L)对Raji细胞的生长具有显著抑制作用,且呈剂量依赖关系.提示MBL作为一种重要的模式识别分子,不仅发挥天然免疫功能,而且可能在调节获得性免疫应答中起一定作用.

苦参碱对Raji细胞凋亡的影响及其机制

目的:探讨活化的p38MAPK在苦参碱(Matrine,Mat)诱导人Burkitt′s淋巴瘤Raji细胞凋亡过程中对Fas/FasL的影响。方法:选用Raji细胞进行体外培养,用苦参碱(终浓度为0.4、0.8、1.6 mg/mL)和在此基础上加入SB203580(p38 MAPK抑制剂)作用48 h后,分别采用AnnexinⅤ-FITC/PI双染法检测细胞凋亡率和Western blot检测P-p38MAPK、Fas、FasL蛋白表达的变化。结果:终浓度为0.4、0.8、1.6 mg/mL苦参碱对Raji细胞总凋亡率显著高于SB203580组及对照组(P<0.05或P<0.01);Western blot显示P-p38MAPK、Fas、FasL蛋白表达水平随苦参碱浓度的提高而增加,并且在加入SB203580后降低。P-p38MAPK与Fas、FasL具有明显相关性。结论:苦参碱可能通过活化p38MAPK来上调Fas、FasL的表达,从而促进Raji细胞凋亡。

自噬在As2O3诱导Burkitt淋巴瘤Raji细胞死亡中的作用及机制研究

目的研究自噬在As2O3诱导的Raji细胞死亡中的作用及机制。方法透射电镜和MDC荧光染色观察细胞自噬形态,MTT法测定细胞增殖活性;流式细胞术(FCM)及FITC-Annexin-V/PI染色检测细胞周期和细胞凋亡,Western blot检测细胞LC3-Ⅰ/Ⅱ表达及转换;RT-PCR检测细胞bcl-2 mRNA和p53 mRNA的表达水平。结果 As2O3明显抑制Raji细胞增殖,诱导其细胞周期G2/M阻滞和凋亡,抑制bcl-2基因和增强p53基因表达。同时,As2O3可同步诱发Raji细胞的自噬活性。自噬抑制剂3-甲基腺嘌呤(3-MA)抑制As2O3诱导的自噬活性,上调bcl-2基因和下调p53基因表达,抑制As2O3对Raji细胞的杀伤效应、降低Raji细胞对As2O3的敏感性。而自噬诱导剂雷帕霉素(Rapa)的作用则与3-MA的效应正好相反。结论细胞凋亡和自噬性细胞死亡共存于As2O3诱导的Raji淋巴瘤细胞死亡中,Bcl-2和p53可能起着关键的调控作用。

夏枯草对Raji细胞生长和凋亡相关基因蛋白表达的影响

目的:探讨夏枯草体外抗淋巴瘤的作用,为临床应用夏枯草治疗淋巴瘤提供实验依据。方法:1.用MTT法测定夏枯草注射液对Raji细胞的生长抑制率,计算出IC50值。同时,用MTT法绘制两种浓度夏枯草注射液(50mg/m l,100 mg/m l)作用于Raji细胞的生长曲线。2.用倒置显微镜、姬姆萨染色法、MTT染色法光镜下观察细胞形态,用免疫细胞化学法检测夏枯草注射液对凋亡相关基因bc l-2、bax蛋白表达的影响,并用图文分析系统进行定量分析。结果:1.夏苦草注射液对Raji细胞生长具有明显的抑制作用,IC50(实际夏枯草浓度)为0.118 mg/m l,且在一定的剂量范围内夏枯草对Raji细胞的抑制作用具有明显的剂量依赖性,相关系数为0.97。2.夏枯草注射液(50mg/m l)作用于Raji细胞后,倒置显微镜,姬姆萨染色,MTT染色光镜下观察,均可见典型的凋亡细胞的形态学特征。免疫细胞化学结果显示,50 mg/m l夏枯草注射液作用于Raji细胞48 h后,bc l-2蛋白表达增强,而bax表示减弱,与对照组相比有显著性差异(P<0.01)。结论:夏枯草可明显抑制Raji细胞增殖,可望成为新的抗淋巴瘤药物,诱导Raji细胞凋亡可能是其发挥抗肿瘤作用的机制之一。

姜黄素对Raji细胞体外抗癌作用的实验研究

目的研究姜黄素对Raji细胞体外抗癌作用及其机制,对比研究其对Raji细胞和人单个核细胞的细胞毒性。方法用MTT法检测姜黄素对Raji细胞及人单个核细胞增殖的影响,AnnexinⅤ/PI双标流式术、缺口末端标记法检测姜黄素对Raji细胞及人单个核细胞凋亡的影响,PI单标流式细胞术测定姜黄素对Raji细胞DNA含量分布的影响。结果(1)姜黄素对Raji细胞具有明显的增殖抑制作用。(2)姜黄素可以时间和剂量依赖性方式诱导Raji细胞凋亡。(3)姜黄素组Raji细胞周期发生变化,细胞周期被阻滞于G0/G1和G2/M期,S期比例减少。(4)姜黄素对人单个核细胞无明显抑制增殖和诱导凋亡作用。结论姜黄素能够调控Raji细胞的细胞周期并诱导其凋亡,从而抑制Raji细胞增殖;姜黄素对人单个核细胞无明显细胞毒作用,而选择性作用于肿瘤细胞。

肿瘤坏死因子α和雷公藤内酯醇调节Raji细胞内VEGF的表达及基质胶中ECV304细胞血管形成作用的研究(英文)

为了探讨肿瘤坏死因子(TNF-α)和雷公藤内酯醇作用Raji细胞VEGF(血管内皮细胞生长因子)的表达及VEGF与ECV血管形成的关系,采用MTT法检测雷公藤内酯醇抑制Raji细胞增殖的影响;用ELISA法对Raji细胞上清的VEGF定量;用基质胶上的内皮细胞网络形成检测ECV304(人类脐静脉内皮细胞起源的细胞系)血管生成;用RT-PCR检测VEGFmRNA含量。结果表明:雷公藤内酯醇对Raji细胞增殖抑制作用呈时间和剂量依赖方式,最适合作用时间为24小时,24小时半数抑制浓度IC50为25nmol/L;Raji细胞上清VEGF的含量在TNF-α组明显高于空白对照组,雷公藤内酯醇处理组则明显低于空白对照组,两者比较有极显著差异(P<0.01);Raji细胞内VEGFmRNA主要为VEGF165和VEGF121,其含量在TNF-α处理组与空白对照组比较有增加,而雷公藤内酯醇抑制VEGFmRNA表达,并呈剂量依赖方式;Raji细胞上清、VEGF(10ng/ml)和TNF-α(10ng/ml)处理的Raji细胞上清在基质胶中作用ECV304细胞后可促进血管形成,而雷公藤内酯醇(25nmol/L)处理的Raji细胞上清和1640培养基作为的对照组加入基质胶中ECV304细胞未见血管形成。结论:在TNF-α、雷公藤内酯醇作用Raji细胞过程中,TNF-α促进VEGF的表达而雷公藤内酯醇则抑制其表达;TNF-α处理的Raji细胞上清在基质胶中促进血管形成,而雷公藤内酯醇则抑制血管形成。

DAPK1基因开放读码序列的克隆、序列分析及诱导Raji细胞凋亡

目的 :探讨死亡相关蛋白激酶 (DAPK1)在肿瘤的形成、转移中所起作用 ,克隆DAPK1基因的开放读码序列 (ORF)。方法 :根据GenBank提供的核苷酸序列 ,自行设计引物 ,用RT -PCR从K562细胞中扩增DAPK1基因的ORF ;用质脂体将pcDNA3 1(+ ) -DAPK1转染到Raji细胞 ,Hoechst 3 3 2 58染色观察细胞凋亡 ,MTT法观察DAPK1基因对细胞生存的影响。结果 :DAPK1基因的ORF克隆到质粒pMD18-T ,测序鉴定 ;分析结果显示 ,从K562细胞成功扩增 43 0 0bp的DAPK1基因ORF有 7处突变 ,其中 6处是同义突变 ,1处是基因的单链核苷酸多态性 ;DAPK1基因的ORF克隆到真核表达载体pcDNA3 1(+ ) ,转化到Raji细胞 ;转染 48h后 ,可以检测到DAPK1的表达 ,并可以观察到细胞发生凋亡。结论 :大片段的基因可以采用RT -PCR法直接克隆 ,采用常规的转染技术可以将大片段基因转染到宿主细胞 ;成功克隆具有活性功能DAPK1基因ORF 。

康莱特注射液对Raji细胞的增殖抑制与凋亡诱导作用

目的：研究康莱特注射液(KLT）对淋巴瘤(Burkitt）细胞株Raji细胞的增殖抑制与凋亡作用。方法：应用细胞生长曲线、电镜及流式细胞仪等方法研究KLT对Raji细胞生长的影响。结果：KLT浓度为10μl／ml作用6小时可引起Raji细胞凋亡率为28．5％，死亡率为15．1％；KLT浓度为4μl／ml作用24小时可引起Raji细胞凋亡率为8．24％，死亡率为51．9％。结论：KLT对淋巴瘤细胞株具有增殖抑制与凋亡作用。

PI3Kδ抑制剂CAL-101对淋巴瘤细胞系Raji和SUDHL-10的作用及其机制研究

目的:探讨PI3Kδ抑制剂CAL-101对弥漫大B细胞淋巴瘤细胞系SUDHL-10和Burkitt淋巴瘤细胞系Raji的作用及其相关机制,为这类疾病的治疗提供新的思路。方法:用不同浓度的CAL-101处理Burkitt淋巴瘤细胞系Raji和弥漫大B细胞淋巴瘤细胞系SUDHL-10,以MTT法检测CAL-101对两种细胞系的增殖抑制作用;以Annexin V/PI流式细胞术和DAPI染色法检测细胞的凋亡情况;迁移实验检测淋巴瘤细胞向淋巴瘤基质细胞系HK的迁移比例;Western blot法检测CAL-101处理后淋巴瘤细胞表达磷酸化ERK的变化;MTT法结合Calcu Syn software软件分析检测CAL-101是否可协同硼替佐米抑制淋巴瘤细胞的增殖。结果:5μmol/L及更高浓度的CAL-101对Raji细胞和SUDHL-10细胞的增殖有明显的抑制作用,且呈剂量依赖性。5、10、15、20μmol/L CAL-101作用于Raji细胞48 h,细胞增殖抑制率分别为(29.17±1.23)%、(38.15±1.51)%、(46.46±1.78)%、(55.8±2.01)%,空白对照组为(1.15±0.02)%(P<0.05)。作用于SUDHL-10 48 h,细胞增殖抑制率也逐渐增加(P<0.05)。CAL-101可诱导淋巴瘤细胞的凋亡,10、20μmol/L CAL-101作用于Raji细胞24 h,Annexin V-FITC/PI双标法显示其凋亡率分别为(22.69±3.83)%和(49.96±7.36)%,均高于对照组(5.23±2.04)%(P<0.05);作用于SUDHL-10细胞同样得到相似的结果(P<0.05)。CAL-101可显著降低淋巴瘤细胞向基质细胞的迁移,且对Raji细胞和SUDHL-10细胞的迁移率的抑制作用也呈浓度依赖性,差异均具有统计学意义(P<0.05);Western blot检测发现CAL-101处理细胞后磷酸化ERK的表达明显降低;CAL-101与硼替佐具有协同作用,可显著抑制淋巴瘤细胞的增殖,CI<1。结论:PI3Kδ抑制剂CAL-101可抑制淋巴瘤细胞Raji和SUDHL-10的增殖,诱导凋亡,抑制其向淋巴瘤基质细胞的迁移,其机制可能通过阻断ERK信号途径而实现;CAL-101有望为侵袭性淋巴瘤的治疗带来希望。