Methanolic extract of Abrus precatorius promotes breast cancer MDA-MB-231 cell death by inducing cell cycle arrest at G0/G1 and upregulating Bax

Objective:To determine the anti-proliferative activity of Abrus precatorius(A.precatorius)leaf extracts and their effect on cell death.Methods:A.precatorius leaves were extracted successively with hexane,ethyl acetate and methanol by Soxhlet extraction.Aqueous extract was prepared by decoction at 50 ℃.Extracts of A.precatorius leaves were used to treat selected cancer and normal cell lines for72 h.Furthermore,3-(4,5-dimethyl thiazol-2-yl)2,5-diphenyl tetrazolium bromide assay was performed to determine cell viability.Analysis of cell cycle arrest,apoptosis assay and apoptosis protein expressions were determined by flow cytometry.Results:Methanolic extract of A.precatorius leaves showed the lowest IC50 on MDA-MB-231 cells at(26.40±5.40)μg/mL.Flow cytometry analysis revealed that cell arrest occurred at G0/G1 phase and the apoptosis assay showed the occurrence of early apoptosis at 48 h in MDAMB-231 cells treated with methanolic extract of A.precatorius leaves.Methanolic extract of A.precatorius leaves induced apoptosis by upregulation of Bax,p53 and caspase-3 and downregulation of Bcl-2.Conclusions:Methanolic extract of A precatorius leaves promotes MDA-MB-231 cell death by inducing cell cycle arrest and apoptosis possibly via the mitochondrial-related pathway.

Anticancer property of sediment actinomycetes against MCF-7 and MDA-MB-231 cell lines

Objective:To investigate the anticancer property of marine sediment actinomvceles against two different breast cancer cell lines.Methods:In vitro anticancer activity was carried out against breast(MCF-7 and MDA-MB-231)cancer cell lines.Partial sequences of the 16s rRNA gene,phylogenetic tree construction,multiple sequence analysis and secondary structure analysis were also carried out with the actinomycetes isolates.Results:Of the selected five actinomycete isolates,ACT01 and ACT02 showed the IC_(50)value with(10.13±0.92)and(22.34±5.82)μg/mL concentrations,respectively for MCF-7 cell line at 48 h,but ACT01 showed the minimum(18.54±2.49μg/mL)level of IC_(50)value with MDA-MB-231 cell line.Further,the 16s rRNA partial sequences of ACT01,ACT02,ACT03,ACT04 and ACT05 isolates were also deposited in NCBI data bank with the accession numbers of GQ478246,GQ478247,GQ478248,GQ478249 and GQ478250.respectively.The phylogenetic tree analysis showed that,the isolates of ACT02 and ACT03 were represented in groupⅠandⅢ,respectively,but ACT01 and ACT02 were represented in groupⅡ.The multiple sequence alignment of the actinomycete isolates showed that,the maximum identical conserved regions were identified with the nucleotide regions of 125 to 221st base pairs,65 to 119th base pairs and 55,48 and 31st base pairs.Secondary structure prediction of the 16s rRNA showed that,the maximum free energy was consumed with ACT03 isolate(-45.4 kkal/mol)and the minimum free energy was consumed with ACT04 isolate(-57.6 kkal/mol).Conclusions:The actinomycete isolates of ACT01 and ACT02(GQ478246 and GQ478247)which are isolated from sediment sample can be further used as anticancer agents against breast cancer cell lines.

Piperine suppresses growth and migration of human breast cancer cells through attenuation of Rac1 expression

Objective:To investigate the effect of piperine on human breast cancer cells.Methods:The effect of piperine on proliferation and migration of human breast cancer cells,MCF-7 and MDA-MB-231,was investigated using colony formation assays,wound healing assays,Matrigel migration assays,flow cytometry,RT-qPCR,and Western blotting assays.Results:Piperine inhibited the growth of MCF-7 and MDA-MB-231 cells and suppressed colony formation.Cell reduction at the G_(0)/G_(1) phase and cell arrest at the G_(2)/M phase were observed in breast cancer cells.However,the significant effect was only demonstrated in MDA-MB-231 cells.Moreover,cancer cell migration was suppressed by piperine at low concentration.RT-qPCR and Western blotting assays showed that piperine downregulated Rac1 gene and protein expression.Conclusions:Piperine could inhibit growth and migration of breast cancer cells by reducing Rac1 gene and protein expression.

Effect of Guizhi Fuling capsule and its extracts on human breast cancer cells proliferation

OBJECTIVE To evaluate the effect of Guizhi Fuling Capsule active pharmaceutical ingredient(API)and its fractions on human breast cancer cells proliferation by high-throughput screening assay.METHODS The crude fractions were obtained from the extraction and elution of the API of Guizhi Fuling Capsule,and 929 standard fractions were obtained by the optimal separation conditions.Sulforhodamine B(SRB)method was used to evaluate the effects of the Guizhi Fuling capsule API and929 kinds of fractions on the proliferation of human breast cancer cells MCF-7 and MDA-MB-231.RESULTS The Guizhi Fuling capsule API had a strong ability to inhibit the proliferation of MCF-7 cells at high concentration and the ability to inhibit MDA-MB-231 cells' proliferate at low concentration following 72 h treatment;some samples of 929 fractions(5μg·mL^(-1))was found to have a breast cancer cell growth inhibition rate above 50%,without toxicity on HUVECs proliferation.CONCLUSION The API of Guizhi Fuling capsule had significant cytotoxicity effects on these two human breast cancer cells,with significant concentration-and time-dependent manner.

Investigating the effects of Pentoxifylline on human breast cancer cells using Raman spectroscopy

Breast cancer is one of the leading causes of cancer-related deaths in a global scenario.In the present study,biochemical changes exerted upon Pentoxifylline(PTX)treatment had been ap-praised in human breast cancer cells using Raman spectrosecopy.There are no clinically approved methods to monitor such therapeutic responses available.The spectral profiling is suggestive of changes in DNA,protein and lipid contents showing a linear relationship with drug dosage.Further,multivariate analysis using principal component based linear-discriminant-analysis(PC-LDA)was employed for dlassifying the control and the PTX treated groups.These findings support the feasibility of Raman spectroscopy as an alternate/adjunct label-free,objective method for monitoring drug-induced modifications against breast cancer cells.

Sensitivity Evaluation of Two Human Breast Cancer Cell Lines to Tamoxifen through Apoptosis Induction

Tamoxifen citrate (TAM) has been used to treat breast cancer in women for many years. The com-parative effects of TAM in inducing apoptosis were evaluated in estrogen receptor-positive (ER- positive MCF-7) and estrogen receptor-negative (ER-negative MDA-MB-231) human breast cancer cell lines in vitro in order to determine if these two cell lines differ in their sensitivity to TAM. Mi-tochondrial membrane permeability potential disruption was assessed in both cell lines by a lip-ophilic cationic dye (DePsipher assay, Trevigen, Inc.) utilizing fluorescence microscopy. Using this specific fluorochrome, we were able to associate mitochondrial membrane disruption to early, mid-, and late apoptotic cells. TAM induced cell death via apoptosis in both ER-positive and ER- negative cells, however, apoptosis induction was more pronounced in ER-positive MCF-7 compared to ER-negative MDA-MB-231 breast cancer cells. These findings may have some therapeutic use in the treatment of estrogen dependent and estrogen independent breast cancer.

Meclizine Chloridrate and Methyl-β-Cyclodextrin Associated with Monophosphoester Synthetic Phosphoethanolamine Modulating Proliferative Potential in Triple-Negative Breast Cancer Cells

Synthetic phosphoethanolamine(Pho-s)is a monophosphoester ester with anti-inflammatory and pro-apoptotic properties.Meclizine chloridrate(MC)is a histamine H1 receptor blocker that is also able to inhibit cellular respiration.However,MC does not inhibit cellular respiration in isolated mitochondria such as antimycin and rotenone.Methyl-β-cyclodextrin(MβCD)belongs to theβ-cyclodextrin family,which is capable of removing cholesterol from the plasma membrane.The aim of this study was to evaluate the proliferative effects of meclizine chloridrate and methyl-β-cyclodextrin compounds associated with synthetic phosphoethanolamine in a triple-negative human breast tumor line,MDA-MB-231 Cell viability of the tumor line and normal cells FN1 was evaluated by MTT colorimetric test;the production of free radicals was determined by lipoperoxidation(LPO)test;and the percentage of cell cycle phases and proliferative index was evaluated by flow cytometry.Cell viability demonstrated a significant decrease with the treatments of MβCD,MC and Pho-s associated with MC.The production of free radicals decreases significantly in all treatments.In addition,a significant increase of DNA fragment and decrease in G0/G1 cell cycle phase were observed in cellular percentage with concentrations of 20 and 30 mM of Pho-s in association with MC and MβCD,respectively.

羊肚菌多糖抑制人乳腺癌细胞MDA-MB-231增殖和诱导细胞凋亡研究

以黑脉羊肚菌多糖为原料,研究羊肚菌多糖对人乳腺癌细胞MDA-MB-231(以下简称MDA)增殖和凋亡的影响。结果表明:在无细胞毒性范围内,羊肚菌多糖能显著抑制人乳腺癌细胞MDA的增殖,半数有效浓度(median effective concentration,EC_(50))值为0.096 mg/m L,同时人乳腺癌细胞MDA表现出多种细胞凋亡的形态学变化。免疫印迹检测实验结果显示,羊肚菌多糖能抑制B淋巴细胞瘤-2(B-cell lymphoma-2,Bcl-2)蛋白表达,促进Bcl-2相关X蛋白(Bcl-2 associated X protein,Bax)表达,同时增加Bax/Bcl-2蛋白表达比值,并呈现出剂量依赖效应。说明羊肚菌多糖能抑制人乳腺癌细胞MDA增殖,促进细胞凋亡。

甘精胰岛素和人胰岛素对人乳腺癌MDA-MB-231细胞的增殖作用

目的探讨甘精胰岛素(insulin glargine)和人胰岛素(human insulin)对人乳腺癌细胞株MDA-MB-231增殖的影响及细胞外信号调节激酶(ERK)的调节作用。方法使用不同浓度的甘精胰岛素和人胰岛素刺激人乳腺癌MDA-MB-231细胞株,检测不同时间段的细胞增殖作用,探讨抑制ERK1/2激活对细胞增殖的影响。使用cell counting kit-8(CCK-8)试剂检测细胞增殖,流式细胞术检测细胞周期分布。结果甘精胰岛素和人胰岛素在1、10、100IU.L-1刺激MDA-MB-231细胞96h后均可轻度促进MDA-MB-231细胞增殖,相同条件下甘精胰岛素和人胰岛素的促增殖效应无差异。甘精胰岛素与人胰岛素以10IU.L-1分别刺激48、72、96h后两药均诱导细胞增殖,比较两种药物间增殖效应的差异无统计学意义。甘精胰岛素和人胰岛素均使S+G2/M期细胞比例增加,但两处理组间差异无显著性。ERK1/2抑制剂PD98059可抑制MDA-MB-231细胞增殖;但PD98059不影响甘精胰岛素和人胰岛素对MDA-MB-231细胞增殖的促进作用。结论甘精胰岛素和人胰岛素对人乳腺癌细胞株MDA-MB-231增殖有类似的轻度促进作用,该作用不依赖于ERK的激活。

Ghrelin抑制多柔比星诱导人乳腺癌细胞MDA-MB-231凋亡的实验研究

目的:探讨Ghrelin抑制多柔比星诱导人乳腺癌细胞MDA-MB-231凋亡的机制。方法 :通过细胞培养、MTT、流式细胞检测、Tunnel法和Western blot观察酰基化Ghrelin对多柔比星诱导的人乳腺癌细胞MDA-MB-231凋亡和凋亡相关蛋白表达的影响。结果:MTT检测证实多柔比星能有效诱导人乳腺癌细胞MDA-MB-231凋亡。流式细胞检测及Tunnel法检测发现Ghrelin能有效抑制多柔比星诱导的人乳腺癌细胞MDA-MB-231的凋亡。Western blot检测发现Ghrelin抑制多柔比星诱导人乳腺癌细胞MDA-MB-231凋亡的同时伴有bcl-2表达增加、bax表达下降、bcl-2/bax值升高。结论:Ghrelin能有效抑制多柔比星诱导人乳腺癌细胞MDA-MB-231凋亡,推测其抑凋亡机制可能与抗线粒体凋亡因子释放有关。

Wnt5a/Dvl2/Rac1信号通路调控MDA-MB-231人乳腺癌细胞的迁移

目的:探讨Wnt5a信号通路调控MDA-MB-231人乳腺癌细胞迁移的分子机制。方法:在建立了划痕实验检测MDAMB-231人乳腺癌细胞迁移模型的基础上,研究Wnt5a/Dvl2/Rac1信号通路对MDA-MB-231人乳腺癌细胞迁移的调控。结果:高表达的Rac1可促进MDA-MB-231人乳腺癌细胞的迁移,干扰Rac1的表达可显著降低其迁移,Rac1活性受Wnt5a/Dvl2信号通路的调控。结论:Wnt5a/Dvl2/Rac1信号通路可调控MDA-MB-231人乳腺癌细胞的迁移,此为深入阐明乳腺癌细胞转移的分子调控机制提供了新线索。

红毛五加多糖对人乳腺癌细胞系MDA-MB-231增殖和核转录因子p53、c-myc蛋白表达的影响

目的探讨红毛五加多糖(AGP)对人乳腺癌细胞系MDA-MB-231增殖以及对细胞核转录因子p53、c-myc表达的影响。方法在DMEM培养基内加入不同浓度AGP(0.15625、0.3125、0.625、1.25、2.5 g/L)体外培养人乳腺癌细胞系MDA-MB-231 1d、3d、5d、7d后,用细胞增殖及细胞毒性检测试剂盒WST-1测定人乳腺癌细胞的增殖,倒置显微镜观察其形态变化;用免疫荧光法、免疫印迹法检测人乳腺癌细胞凋亡相关蛋白p53、c-myc的表达。结果 WST-1法显示,不同浓度AGP作用3d、5d、7d后对人乳腺癌细胞系MDA-MB-231的增殖具有抑制作用,与阴性对照组相比差异有显著性(P<0.05);抑制率与AGP剂量、作用时间呈依赖性。免疫荧光法及免疫印迹法显示,AGP作用于人乳腺癌细胞系MDA-MB-231后,其细胞的c-myc表达明显减弱,并向细胞质内聚集;而免疫印迹法显示p53表达显著增强。结论 AGP具有抑制人乳腺癌细胞系MDA-MB-231增殖的作用,这可能与AGP下调c-myc表达、上调p53表达有关。

非甾体类抗炎药对乳腺癌细胞MDA-MB-231增殖影响的实验室研究

目的通过研究阿司匹林、塞来昔布及两者分别联合阿那曲唑对乳腺癌细胞MDA-MB-231的抑制作用,探讨并比较阿司匹林和塞来昔布的抗肿瘤作用。方法采用MTT法检测不同浓度的阿司匹林、塞来昔布及两者分别联合阿那曲唑对乳腺癌细胞MDA-MB-231增殖的影响。结果阿司匹林、塞来昔布单药对MDA-MB-231细胞生长均有抑制作用,表现为浓度、时间依赖性,统计学差异具有统计学意义(P<0.05);不同浓度的阿司匹林、塞来昔布分别联合阿那曲唑后对MDA-MB-231细胞的抑制作用较单用阿那曲唑增强,亦表现为浓度依赖性,差别具有统计学意义(P<0.05)。结论阿司匹林和塞来昔布均有抑制乳腺癌MDA-MB-231细胞的作用,两者分别联合阿那曲唑后有协同抗肿瘤的作用。

复方山慈菇醇提物对人乳腺癌MDA-MB-231细胞增殖与凋亡的影响

目的:探讨复方山慈菇醇提物对人三阴性乳腺癌(TNBC)MDA-MB-231细胞增殖与凋亡的影响。方法:将人乳腺癌MDA-MB-231细胞分为溶剂对照组和复方山慈菇醇提物组,0.1%DMSO或不同浓度的复方山慈菇醇提物作用于MDA-MB-231细胞24 h、48 h后,CCK-8法检测细胞活性;Hoechst33342染色法观察细胞形态学变化;Annexin V-APC/7-AAD双染色流式分析检测细胞凋亡率;Western blot检测凋亡相关蛋白Bcl-2、Bax和Caspase-3的表达。结果:复方山慈菇醇提物可浓度和时间依赖性地抑制MDA-MB-231细胞的增殖(P<0.05),24 h、48 h的IC50分别为0.51 mg生药/mL和0.26 mg生药/mL;0.25 mg生药/mL、0.5 mg生药/mL、1.0 mg生药/mL复方山慈菇醇提物处理24 h后,Hoechst33342染色显示细胞出现凋亡样变化;流式细胞术检测结果表明,与溶剂对照组比较,复方山慈菇醇提物可浓度依赖性地增加MDAMB-231细胞凋亡率(P<0.05);Western blot法显示,与溶剂对照相比,0.5 mg生药/mL复方山慈菇醇提物组Bax、Caspase-3蛋白表达升高,Bcl-2蛋白表达下降(均P<0.05)。结论:复方山慈菇可体外抑制人乳腺癌MDA-MB-231细胞的增殖,机制可能与其下调Bcl-2及上调Bax、Caspase-3蛋白表达而诱导凋亡有关。

精氨白桦脂酸的制备及其对三阴性人乳腺癌细胞MDA-MB-231增殖的影响

目的:制备精氨白桦脂酸,并考察其对三阴性人乳腺癌细胞MDA-MB-231增殖的影响。方法:以精氨酸为增溶载体,采用共研磨法将等摩尔比的白桦脂酸与精氨酸制成精氨白桦脂酸。采用粉末X射线衍射法、红外光谱法、差示扫描量热法对精氨白桦脂酸进行表征;比较白桦脂酸和精氨白桦脂酸的溶解度;采用MTT法检测15、30、60、120μg/mL的白桦脂酸、精氨白桦脂酸和5氟尿嘧啶(5-FU)对MDA-MB-231细胞增殖的影响。结果:所制精氨白桦脂酸为不同于精氨酸与白桦脂酸物理叠加的新的物相,其中白桦脂酸的羧基与精氨酸中氨基进行了成盐反应,其未见明显的熔点峰。白桦脂酸几乎不溶于水,精氨白桦脂酸水溶液中白桦脂酸的溶解度为50.72μg/mL。与白桦脂酸比较,精氨白桦脂酸对MDA-MB-231细胞的增殖抑制率明显升高(P<0.05),且与5-FU比较差异无统计学意义(P>0.05)。结论:成功制得溶解度较好的精氨白桦脂酸,其对MDA-MB-231细胞的增殖具有抑制作用。

鲍鱼肽的制备及其抑制人乳腺癌MDA-MB-231细胞增殖作用

将鲍鱼内脏进行蛋白酶解、超滤和纳滤制备鲍鱼肽,研究不同质量浓度鲍鱼肽对体外培养人乳腺癌MDA-MB-231细胞增殖和凋亡的影响。结果表明:鲍鱼肽中除含有71.62%(质量分数,下同)蛋白以外,还含有3.38%碳水化合物和11.48%灰分;鲍鱼肽的分子质量主要分布在350～1 000 Da,丰度较高的蛋白肽分子质量分布在350 Da附近,表明鲍鱼肽中由2～3个氨基酸组成的寡肽占比较高。根据四甲基偶氮唑蓝法检测的结果,发现不同质量浓度(1、2、4、8 mg/mL)鲍鱼肽均能抑制MDA-MB-231细胞的生长增殖,并呈现出明显的剂量依赖性。伴随鲍鱼肽质量浓度的增加,贴壁细胞数量逐渐减少,细胞变圆,且部分细胞核出现浓缩。流式细胞术分析结果表明,鲍鱼肽主要将MDA-MB-231细胞阻滞在S期和G2期,诱导MDA-MB-231细胞凋亡和坏死,进而抑制肿瘤细胞增殖。因此,利用鲍鱼内脏制备的蛋白肽是一种具有发展潜力的辅助抗肿瘤功能性食品。

人参皂苷Rb1对人乳腺癌MDA-MB-231细胞上皮-间质转化及ROR1表达的影响

目的探讨人参皂苷Rb1通过干扰人乳腺癌MDA-MB-231细胞上皮-间质转化(EMT)和Ⅰ型受体酪氨酸激酶样孤儿受体(ROR1)的表达来影响乳腺癌的发生和发展的可行性。方法细胞培养人乳腺癌MDA-MB-231细胞,采用四甲基偶氮唑盐(MTT)法检测细胞生存率,并根据人参皂苷Rb1的质量浓度分为空白对照组,高、中、低剂量组(240,120,60μg/m L),阳性对照组(阿霉素,75 nmol/L)。采用细胞划痕法检测细胞的迁移能力,采用实时定量PCR检测细胞ROR1 mRNA的表达水平,采用酶联免疫吸附(ELISA)法检测细胞ROR1蛋白的表达水平。结果与空白对照组比较,随着人参皂苷Rb1质量浓度的增加,细胞的迁移能力显著降低,人参皂苷Rb1各剂量组具有明显的量-效关系(P<0.05),高剂量组与阳性对照组结果基本一致(P>0.05);与空白对照组比较,随着人参皂苷质量浓度的增加,细胞生存率逐渐降低(P<0.05),且高剂量组与阳性对照组结果一致(P>0.05);与空白对照组比较,人参皂苷Rb1各剂量组和阳性对照组ROR1 mRNA和蛋白表达水平均显著降低(P<0.05),随着质量浓度的增加,表达量逐渐降低,量-效关系明显(P<0.05),人参皂苷Rb1高剂量组与阳性对照组结果一致(P>0.05)。结论人参皂苷Rb1可能通过抑制人乳腺癌MDA-MB-231细胞上皮-间质转化和ROR1表达来减缓乳腺癌的发生、发展。

CK18对沉默HIF-1α的人“三阴”乳腺癌MDA-MB-231细胞凋亡的影响

目的研究CK18对HIF-1α干扰后的人"三阴"乳腺癌MDA-MB-231细胞凋亡的影响。方法采用shRNA干扰技术沉默MDA-MB-231细胞中的HIF-1α基因,选择RT-PCR及Western blot技术确定HIF-1α干扰效果。构建真核表达载体CK18-PEGFP-C1,以脂质体转染法将其转染入HIF-1α干扰后的MDA-MB-231细胞中,荧光显微镜下评估转染效率,Western blot检测CK18蛋白的表达情况。同时以空载体PEGFP-C1转染HIF-1α干扰后的MDA-MB-231细胞为阴性对照组。实验分别通过流式细胞术及Hoechst凋亡检测试剂盒检测CK18对细胞周期及凋亡的影响。结果构建了CK18-PEGFP-C1真核表达载体,基因测序结果与Gen Bank报道的完全一致,并转染了封闭HIF-1α基因的MDA-MB-231细胞,Western blot显示CK18蛋白表达上调。AnnexinⅤ-FITC/PI双染细胞凋亡检测分析CK18转染组早期凋亡率[(4. 9±0. 17)%]高于对照转染组[(3. 09±0. 25)%],差异有统计学意义(P <0. 05)。Hoechst染色试剂盒检测细胞凋亡显示CK18转染组的细胞凋亡率[(53±11)%]高于对照转染组[(21±13)%],差异有统计学意义(P <0. 05)。结论成功构建了CK18真核表达载体,并在HIF-1α干扰后的人"三阴"乳腺癌MDA-MB-231细胞中稳定表达后,可促进细胞凋亡。

二甲双胍抑制人MDA-MB-231细胞增殖及迁移的体外实验研究

目的:研究二甲双胍对体外培养的人三阴性乳腺癌MDA-MB-231细胞增殖及迁移的影响。方法:MTT实验分为4个处理组,分别为RPMI 1640培养基对照组,浓度为1、2、4 mmol/L的二甲双胍处理组,在作用48、72 h后测定各组的细胞活力并进行统计学分析;倒置相差显微镜下观察药物处理72 h后人乳腺癌MDA-MB-231细胞与对照组相比的形态变化;Giemsa染色观察4 mmol/L二甲双胍作用48 h后的细胞形态;采用细胞划痕实验和Transwell实验,检测二甲双胍(2、4 mmol/L)作用人乳腺癌MDAMB-231细胞24 h后,对细胞迁移能力的影响。结果:MTT实验结果显示4 mmol/L二甲双胍作用72 h可显著抑制MDA-MB-231细胞的活力,抑制率为(29.83±2.25)%,与对照组相比,细胞活力降低(P<0.05)。倒置相差显微镜下形态学观察发现,与对照组相比,4 mmol/L二甲双胍处理组细胞密度降低,变圆的细胞数量增加,细胞与细胞之间的联系减少。Giemsa染色结果显示4 mmol/L二甲双胍作用48 h后,部分细胞出现凋亡细胞核碎裂形态。划痕实验结果表明,2、4 mmol/L二甲双胍作用24 h后细胞汇合度明显低于对照组,其中4 mmol/L处理组的划痕愈合率为(52.67±4.48)%,与对照组间的差异显著(P<0.01);Transwell实验结果表明,2、4 mmol/L二甲双胍作用细胞24 h后穿膜细胞数量减少,穿膜细胞数量分别为(61.6±1.6)、(51.3±2.6)个,均低于对照组的(99.3±18.9)个(P<0.05)。结论:二甲双胍在体外可抑制人乳腺癌MDA-MB-231细胞的增殖及迁移。

体外扩增人外周血来源免疫细胞对MDA-MB-231细胞的杀伤作用

目的探讨人外周血来源的细胞因子诱导杀伤(CIK)细胞、树突状细胞-细胞因子诱导杀伤(DC-CIK)细胞和自然杀伤(NK)细胞对人MDA-MB-231乳腺癌细胞的体外杀伤作用。方法采用含红色荧光蛋白标签(RFP)和萤光素酶报告基因(Luc)的慢病毒感染MDA-MB-231细胞,通过荧光显微镜检测MDA-MB-231细胞感染率。分离人外周血单个核细胞(PBMC),诱导获得CIK细胞、DC-CIK细胞、NK细胞,体外扩增培养。采用流式细胞术检测免疫细胞的扩增效果及表型,并检测体外扩增的人外周血来源免疫细胞在不同效靶比下对MDA-MB-231肿瘤细胞的抑制作用。结果DC-CIK细胞、NK细胞及CIK细胞对MDA-MB-231肿瘤细胞的杀伤作用随效靶比的增加以及作用时间的延长而增强。共培养72 h后,免疫细胞对靶细胞的杀伤率均达到90%以上。结论体外扩增的CIK细胞、DC-CIK细胞、NK细胞对乳腺癌细胞具有杀伤作用。