NGF对乳腺癌细胞系MDA-MB-231和MCF-7增殖和存活的影响

目的:研究神经生长因子(NGF)对乳腺癌细胞系MDA-MB-231和MCF-7细胞增殖与存活的影响。方法:运用免疫荧光方法检测NGF及其受体酪氨酸蛋白激酶A(TrkA)的表达;运用酶联免疫吸附测定(ELISA)方法检测细胞的NGF自分泌情况;运用蛋白质印迹(Western blotting)方法检测TrkA蛋白的表达情况;运用NGF阻断剂Ro 08-2750对细胞进行NGF剥夺,通过单核细胞直接细胞毒性测定法(MTT)检测细胞增殖的情况;运用流式细胞仪检测细胞凋亡情况以及细胞周期分布的变化。结果:2株乳腺癌细胞系均表达NGF及其受体TrkA,NGF阻断剂Ro 08-2750能够明显抑制2种细胞的增殖,并具有剂量依赖性;流式细胞仪显示Ro 08-2750处理的MDA-MB-231细胞和MCF-7细胞的S期细胞比例明显增加,G2/M期细胞比例明显降低,MDA-MB-231细胞出现凋亡峰。结论:NGF剥夺明显抑制乳腺癌细胞系MDA-MB-231和MCF-7的增殖,并引起MDA-MB-231细胞凋亡。     

MDA-7/IL-24 inhibits the growth and induces the apoptosis of human breast cancer MDA-MB-231 cell line

目的 探讨IL-24基因转染乳腺癌MDA-MB-231细胞的增殖抑制和促凋亡作用.方法 利用脂质体将穿梭质粒pDC316-hIL-24-EGFP瞬时转染至乳腺癌MDA-MB-231细胞,通过RT-PCR检测转染后hIL-24基因mRNA的转录,Western blot检测转染后IL-24和caspase-3蛋白的表达,MTT比色法测定细胞增殖的抑制,流式细胞仪检测细胞的凋亡和细胞周期的变化,Hoechst 33258染色检测细胞凋亡.结果 IL-24基因可在MDA-MB-231细胞中成功转录及表达.IL-2可上调MDA-MB-231细胞中caspase-3蛋白表达.IL-24基因的表达使得乳腺癌MDA-MB-231细胞出现增殖抑制.流式细胞仪检测显示MDA-MB-231细胞DNA合成受到抑制,细胞周期主要抑制在G2/M期.Hoechst 33258染色显示IL-24基因转染后MDA-MB-231细胞出现凋亡.结论 IL-24基因转染乳腺癌MDA-MB-231细胞后可能通过上调caspase-3的表达而抑制细胞增殖,促进其凋亡.     

MDA-7/IL-24对乳腺癌MDA-MB-231细胞生长抑制和凋亡的影响

 摘要：目的 探讨IL-24基因转染乳腺癌MDA-MB-231细胞的增殖抑制和促凋亡作用。方法 利用脂质体将穿梭质粒pDC316-hIL-24-EGFP瞬时转染至乳腺癌MDA-MB-231细胞,通过RT-PCR检测转染后hIL-24基因mRNA的转录,Western blot检测转染后IL-24和Caspase-3蛋白的表达,MTT比色法测定细胞增殖的抑制, 流式细胞仪检测细胞的凋亡和细胞周期的变化,Hoechst 33258染色检测细胞的凋亡情况。结果IL-24基因可在MDA-MB-231细胞中成功转录及表达。IL-24可上调MDA-MB-231细胞中Caspase-3蛋白表达。IL-24基因的表达使得乳腺癌MDA-MB-231细胞出现增殖抑制。流式细胞仪检测显示MDA-MB-231细胞DNA 合成受到抑制,细胞周期主要抑制在G2/M期。Hoechst 33258染色显示IL-24基因转染后MDA-MB-231细胞出现凋亡。结论IL-24基因转染乳腺癌MDA-MB-231细胞后能够抑制细胞增殖并促进其凋亡,其机制之一可能是上调Caspase-3的表达。     

上调胰岛素样生长因子结合蛋白6基因对乳腺癌细胞 MDA-MB-231细胞周期和凋亡的影响*

目的：探究上调胰岛素样生长因子结合蛋白6（IGFBP-6）基因对乳腺癌细胞MDA-MB-231细胞周期和凋 亡的影响。方法：体外培养人三阴性乳腺癌MDA-MB-231细胞,转染IGFBP-6 过表达质粒,实时荧光定量PCR 法验证转染效率;流式细胞术检测转染IGFBP-6 后的细胞周期的改变及凋亡的情况;免疫印迹检测增殖细胞核抗 原（PCNA）、细胞周期蛋白D1（cyclin D1）、凋亡相关蛋白Bcl-2 和Bax 的蛋白表达水平。结果：IGFBP-6 转染 MDA-MB-231细胞后,IGFBP-6 的mRNA水平明显上调;PCNA、细胞周期蛋白D1 的表达水平明显降低;细胞 G1/S 期阻滞;凋亡细胞增多。结论：IGFBP-6 可以显著抑制乳腺癌细胞的增殖,促进细胞凋亡。     

单羧酸转运蛋白基因过表达对MDA-MB-231乳腺癌细胞生物学行为的影响

目的研究单羧酸转运蛋白(MCT)基因过表达对乳腺癌MDA-MB-231细胞凋亡、细胞周期、侵袭和转移能力的影响。方法将真核表达质粒pcDNA3.1/MCT及空质粒pcDNA3.1分别转染乳腺癌MDA-MB-231细胞。采用实时定量PCR(qRTPCR)和Western blot法分别检测转染后细胞内MCT基因的表达。Annexin V-FITC/PI染色和PI单染色结合流式细胞术检测MCT基因过表达对乳腺癌MDA-MB-231细胞凋亡、细胞周期的影响,Transwell实验检测MCT基因过表达对乳腺癌MDA-MB-231细胞侵袭能力的影响,划痕实验检测MCT基因过表达对乳腺癌MDA-MB-231细胞迁移能力的影响。结果实验组MCT的mRNA和蛋白水平明显高于转染空质粒的阴性对照组和未处理组;MCT过表达能促进乳腺癌MDA-MB-231细胞的凋亡,G2期细胞减少、S期细胞增多,同时能抑制癌细胞的侵袭和迁移能力。结论 MCT基因过表达能促进MDA-MB-231细胞的凋亡、调节细胞G2/M期检控点,抑制细胞的侵袭和迁移能力。     

蛴螬提取物对MCF-7人乳腺癌细胞株凋亡的影响

目的：研究蛴螬提取物对MCF-7人乳腺癌细胞株凋亡通路的影响，为天然药物蛴螬的开发提供实验和理论依据。方法:应用MTT法检测蛴螬提取物对MCF-7人乳腺癌细胞株的抗增殖作用及细胞毒活性；通过倒置显微镜、HE染色、吖碇橙（AO）/溴化乙啶（EB）荧光染色方法观察肿瘤细胞的形态学改变；应用流式细胞仪检测细胞凋亡率的变化；应用免疫细胞化学技术（S-P法）检测用药前后凋亡通路中Bcl-2、Fas、caspase-9、caspase-3的表达改变，探讨蛴螬提取物对凋亡通路的影响。结果:(1)用MTT法检测结果表明，蛴螬提取物在体外对MCF-7人乳腺癌细胞株有明显的抑制增殖作用，实验组与对照组相比其生长抑制率有显著差异（P<0.01），而且这种抑制作用呈现浓度和时间的依赖性；(2)倒置显微镜观察表明，实验组可见胞核固缩、碎裂、凋亡小体形成等凋亡形态学变化；(3)HE染色表明实验组胞核浓缩呈蓝黑色、胞浆呈淡红色、核染色质浓缩、呈碎块状，有凋亡小体形成；(4)经AO／EB荧光染色观察结果表明，实验组出现凋亡细胞；(5)流式细胞仪结果表明实验组凋亡率明显增加，呈时间依赖性；(6)免疫细胞化学染色结果表明，实验组 Bcl-2表达下调，Fas、caspase-3、caspase-9表达均上调，与对照组比差异显著（P<0.01）。结论:①蛴螬提取物在体外显著抑制MCF-7人乳腺癌细胞株增殖；②蛴螬提取物对MCF-7人乳腺癌细胞株凋亡通路的影响机制可能是通过下调Bcl-2，上调Fas、caspase-3 、caspase-9的蛋白表达而起作用，是经由细胞凋亡的线粒体途径和死亡受体途径来完成凋亡的启动和执行。     

mTOR激酶抑制剂CC-223抑制乳腺癌细胞增殖的实验研究

目的:探讨哺乳动物雷帕霉素靶蛋白(mTOR)激酶抑制剂CC-223对乳腺癌细胞增殖的抑制作用及其相关分子机制。方法:CCK-8法检测CC-223对人乳腺癌细胞MCF-7和MDA-MB-231细胞活力的抑制作用;流式细胞术分析CC-223对乳腺癌细胞周期的影响;Western blot实验检测CC-223对细胞周期调控相关蛋白及细胞增殖相关蛋白c-Myc和存活蛋白(survivin)表达的影响。结果:CCK-8结果表明,CC-223能够显著抑制MCF-7细胞和MDA-MB-231细胞活力(P<0.05);流式细胞术实验结果显示,CC-223能够诱导MCF-7细胞发生G 1期和G 2/M期阻滞(P<0.05);较低浓度的CC-223诱导MDA-MB-231细胞周期阻滞于G 2/M期(P<0.05),而处于G 1期的细胞数量无显著差异。CC-223处理乳腺癌细胞24 h后,细胞周期蛋白B1、细胞周期蛋白D1表达和细胞分裂周期蛋白2(Cdc2)磷酸化水平显著降低(P<0.05)。Western blot结果表明,MCF-7和MDA-MB-231细胞经CC-223作用后,c-Myc和survivin的表达水平显著下调(P<0.05)。结论:CC-223能够抑制乳腺癌细胞活力,阻滞细胞周期进程,同时下调乳腺癌细胞中c-Myc与survivin的蛋白表达。     

VEGF基因特异性siRNA转染后对人乳腺癌细胞增殖和凋亡的影响

目的：探讨利用干扰RNA（RNAi）抑制血管内皮生长因子（VEGF）基因表达对乳腺癌细胞MCF-7增殖和凋亡的影响。方法：设计针对VEGF基因的小干扰RNA（siRNA）,合成DNA模板,体外转录siRNA。以脂质体转染法将双链siRNA导入MCF-7细胞后,用MTT比色法检测siRNA对MCF-7细胞增殖的影响。通过Hoechst33258染色观察MCF-7细胞的凋亡。用流式细胞术检测细胞周期的改变,RT-PCR检测VEGF mRNA表达的变化,免疫细胞化学法检测VEGF蛋白的表达。结果：所设计的两个靶位点siRNA,均能有效地抑制MCF-7细胞的增殖,诱导细胞凋亡,使细胞周期阻滞于G0/G1期,VEGFmRNA及其蛋白的表达明显减少;而作为阴性对照的错义序列组siRNASCR则没有上述效应。结论：体外转录合成的siRNA可抑制MCF-7细胞中VEGF基因的表达,抑制细胞增殖,促进细胞凋亡。     

半枝莲对三阴乳腺癌细胞株MDA-MB-231细胞增殖、凋亡和迁移的影响

目的研究半枝莲对三阴乳腺癌细胞株MDA-MB-231细胞增殖、凋亡和迁移的影响。方法 MDAMB-231细胞株培养,分别用生理盐水、25μg/mL、50μg/mL、75μg/mL和100μg/mL半枝莲处理细胞,分别于12 h、24 h和48 h应用酶联免疫检测仪测定细胞增殖,流式细胞仪测定细胞凋亡和细胞周期,采用Boyden小室法测定细胞迁移能力。结果半枝莲呈浓度和时间依赖抑制MDA-MB-231细胞生长;呈剂量依赖促进细胞凋亡100μg/mL时凋亡细胞比率最大为50.0%;呈剂量依赖性阻滞MDA-MB-231细胞周期,G_1期细胞比率,降低S期和G_2期细胞数;呈剂量依赖性抑制MDA-MB-231细胞的迁移,100 mg/mL时显著抑制MDA-MB-231细胞迁移。结论半枝莲浓度为100μg/mL时,可有效阻滞细胞周期,抑制MDA-MB-231细胞增殖,促进细胞凋亡,抑制细胞迁移。     

黄芪多糖在体外巨噬细胞-乳腺癌细胞共培养体系中的作用

目的探索黄芪多糖(Astragalus polysaccharides,APS)对人源性巨噬细胞THP-1—乳腺癌细胞株共培养体系中乳腺癌细胞株细胞功能的影响以及对巨噬细胞的激活作用。方法 CCK-8比色法分别检测APS对THP-1、MDA-MB-231和MCF-7细胞增殖能力的影响。建立THP-1—MDA-MB-231共培养体系,分为231组、231+APS组、231+ADM组、231+THP-1组和231+THP-1+APS组,处理24 h,收集231细胞,流式细胞仪检测各组231细胞周期和凋亡;显微镜下计数评价各组231细胞迁移和侵袭能力。单独培养THP-1细胞,Greiss法和ELISA法分别检测NO和细胞因子分泌情况。结果不同质量浓度的APS对MDA-MB-231和MCF-7细胞增殖能力均无明显作用(P0.05),300μg/ml的APS可以显著促进THP-1细胞的增殖活性(P0.05);在231+THP-1+APS组中,相对于231组和231+THP-1组,231细胞的S期细胞明显减少,凋亡率明显增加,迁移和侵袭能力明显抑制(P0.05)。单独培养THP-1细胞,APS显著促进THP-1细胞NO、IL-1β、IL-6和TNF-α的分泌(P0.05),而对IL-12无显著影响(P0.05)。结论在共培养体系中APS可以抑制MDA-MB-231细胞的生物学行为,其作用机制可能与活化巨噬细胞产生效应因子有关。     

Targeting choline phospholipid metabolism: GDPD5 and GDPD6 silencing decrease breast cancer cell proliferation,migration, and invasion

Abnormal choline phospholipid metabolism is associated with oncogenesis and tumor progression. We have investigated the effects of targeting choline phospholipid metabolism by silencing two glycerophosphodiesterase genes, GDPD5 and GDPD6, using small interfering RNA (siRNA) in two breast cancer cell lines, MCF‐7 and MDA‐MB‐231. Treatment with GDPD5 and GDPD6 siRNA resulted in significant increases in glycerophosphocholine (GPC) levels, and no change in the levels of phosphocholine or free choline, which further supports their role as GPC‐specific regulators in breast cancer. The GPC levels were increased more than twofold during GDPD6 silencing, and marginally increased during GDPD5 silencing. DNA laddering was negative in both cell lines treated with GDPD5 and GDPD6 siRNA, indicating absence of apoptosis. Treatment with GDPD5 siRNA caused a decrease in cell viability in MCF‐7 cells, while GDPD6 siRNA treatment had no effect on cell viability in either cell line. Decreased cell migration and invasion were observed in MDA‐MB‐231 cells treated with GDPD5 or GDPD6 siRNA, where a more pronounced reduction in cell migration and invasion was observed under GDPD5 siRNA treatment as compared with GDPD6 siRNA treatment. In conclusion, GDPD6 silencing increased the GPC levels in breast cancer cells more profoundly than GDPD5 silencing, while the effects of GDPD5 silencing on cell viability/proliferation, migration, and invasion were more severe than those of GDPD6 silencing. Our results suggest that silencing GDPD5 and GDPD6 alone or in combination may have potential as a new molecular targeting strategy for breast cancer treatment. Copyright © 2016 John Wiley & Sons, Ltd.     

Tumor necrosis factor-mediated cell lysis in vitro: relationship to cAMP accumulation and guanine nucleotide-binding proteins.

We have investigated the modulation of tumor necrosis factor (TNF)-mediated tumor cell lysis by cAMP. Among a panel of human breast tumor cell lines, MCF7 and MDA MB 231 were shown to be, respectively, sensitive and resistant to TNF-mediated cell lysis in vitro. 125I-labeled TNF-binding experiments demonstrated that both cell lines bind TNF, indicating that the differential sensitivity to TNF was not related to TNF receptor expression. To study the relationship between TNF-mediated cell lysis and cAMP accumulation, cAMP measurement was performed following TNF treatment. Our data show that TNF alone did not induce an enhancement of intracellular cAMP accumulation either in the TNF-sensitive or in the TNF-resistant cell line. Experiments in which cells were exposed to forskolin revealed that this cAMP elevating drug was efficient in enhancing the sensitivity to TNF of MCF7 cell line. This potentiating effect of forskolin was maximal for suboptimal concentrations of TNF (10 ng/ml), reaching up to 100% when forskolin was added at 100 microM. However, co-stimulating with forskolin of either MDA MB 231 or a TNF-resistant MCF7 clone (MCF7-R-A1) did not induce any reversal of resistance to TNF. We further assessed the interaction of TNF with transmembrane signalling and the possible involvement of guanine nucleotide-binding proteins (G-proteins). Bacterial toxin-catalyzed ADP ribosylation of MCF7 and MDA MB 231 membranes was, therefore, performed. Using cholera toxin, we demonstrate that TNF treatment did not quantitatively alter the activity of stimulatory G-proteins either in MCF7 or MDA MB 231 cell line. In contrast, pertussis toxin-catalyzed ADP ribosylation experiments suggest a functional coupling of TNF receptors to a 40-kDa pertussis toxin-sensitive G-protein in the TNF-sensitive MCF78 cell line but not in the TNF-resistant MDA MB 231 cell line. Taken together, these data indicate that cAMP might play a role in TNF-mediated cell lysis and are in support of the involvement of a pertussis toxin-sensitive G-protein in TNF-mediated MCF7 cells lysis.     

bcl—2／bax对不同乳腺癌细胞凋亡的调节作用

目的：了解bcl-2/bax在乳腺癌细胞的p53依赖性凋亡和p53非依赖性凋亡中的作用。方法：用原位杂交的方法检测化疗药物VM-26诱导入乳腺癌细胞株MCF-7和MDA-MB-435S凋亡前后bcl-2和bax的mRNA表达情况。结果：与MDA-MB-435S细胞相比,MCF-7细胞的bcl-2 mRNA水平较高。两株细胞均能在VM-26的作用下发生凋亡。药物诱导后,MCF-7细胞的bcl-2 mRNA表达下降,bax mRNA表达增加;MDA-MB-435S细胞bax mRNA表达增加,bcl-2、mRNA无明显变化。结论：wt p53可在转录水平调节bcl-2/bax的表达,从而介导凋亡作用;bax在p53非依赖性凋亡中也发挥一定作用;bcl-2的高表达可能与肿瘤耐药性有关。     

rhCD40L联合化疗药物对乳腺癌细胞株生物学行为的影响

为了研究人重组CD40L(rhCD40L)对乳腺癌细胞株MDA-MB-231、MDA-MB-435细胞生物学行为的影响,运用多种细胞生物学、分子生物学方法检测细胞生长、细胞周期、细胞膜分子、凋亡相关基因Bcl-Xl、Bax及趋化因子RANTESmRNA水平的改变,并观察了rhCD40L联合IFN-γ、阿霉素(ADM)对MDA-MB-231细胞增殖的影响。结果发现rhCD40L抑制MDA-MB-435、MDA-MB-231细胞增殖,与剂量呈负相关(P<0.05);两株乳腺癌细胞分别在CD40配基化(ligation)作用48、72h进入G1期细胞阻滞;MDA-MB-231细胞CD54、CD95(Fas)、CD120b等分子表达均显著上调,CD95L(FasL)表达下调(P<0.05);MDA-MB-435细胞CD49e、CD95L、CD120a、HLA-DR等分子有显著性变化。两株乳腺癌细胞经rhCD40L作用4、24h后,RT-PCR半定量Bax/Bcl-Xl的比率、RANTES的表达与对照组相比均上调。rhCD40L联合IFN-γ、阿霉素对MDA-MB-231细胞增殖有较强的抑制作用(P<0.05)。由此表明,CD40信号影响乳腺癌细胞周期及TNF家族成员及MHCII类分子的表达,上调凋亡相关基因Bax/Bcl-Xl的比值和趋化因子RANTESmRNA水平,直接或间接介导抗肿瘤作用。同时,rhCD40L还可增强肿瘤细胞对细胞因子和化学药物的敏感性。     

靶向COL1A1基因的 shRNA对人乳腺癌MDA-MB-231细胞增殖与凋亡的影响

 目的：探讨抑制Ⅰ型胶原α1链（COL1A1）基因表达对人乳腺癌MDA-MB-231细胞增殖及凋亡的影响。方法：用已构建的pSilencer2.1-U6-COL1A1重组质粒转染乳腺癌细胞MDA-MB-231,采用RT-PCR和Western blotting技术检测重组质粒对COL1A1基因表达的影响,MTT比色法测定细胞增殖的抑制情况,流式细胞术检测细胞周期和细胞凋亡的变化,Hoechst 33258荧光染色观察细胞凋亡的形态学变化。结果：RT-PCR及Western blotting结果证实重组质粒在mRNA和蛋白水平分别显著抑制COL1A1基因表达;pshRNA-COL1A1转染组细胞的增殖速度明显减慢且呈时间依赖关系;与对照组相比,pshRNA-COL1A1组细胞明显阻滞于G₀/G₁期,细胞凋亡率显著升高（P<0.05）,出现细胞质浓缩、核凝聚等凋亡形态学变化。结论：pshRNA-COL1A1能有效抑制乳腺癌MDA-MB-231细胞增殖,并诱导其凋亡,为以COL1A1为靶点的乳腺癌基因治疗提供实验依据。     

Characterization of choline kinase in human endothelial cells

High choline kinase‐α (Chk‐α) expression is frequently observed in cancer cells, making it a novel target for pharmacological and molecular inhibition. As inhibiting agents are delivered systemically, it is important to determine Chk‐α expression levels in endothelial cells that line both normal and tumor vasculature, and the effect of Chk‐α downregulation on these cells. Here, we characterized Chk‐α expression and the effect of its downregulation in human umbilical vein endothelial cells (HUVECs) relative to MDA‐MB‐231 human breast cancer cells. We used small interfering RNA (siRNA) to downregulate Chk‐α expression. Basal mRNA levels of Chk‐α were approximately three‐fold lower in HUVECs relative to MDA‐MB‐231 breast cancer cells. Consistent with the differences in Chk‐α protein levels, phosphocholine levels were approximately 10‐fold lower in HUVECs relative to MDA‐MB‐231 cells. Transient transfection with siRNA‐Chk resulted in comparable levels of mRNA and protein in MDA‐MB‐231 breast cancer cells and HUVECs. However, there was a significant reduction in proliferation in MDA‐MB‐231 cells, but not in HUVECs. No significant difference in CD31 immunostaining was observed in tumor sections obtained from mice injected with control luciferase‐short hairpin (sh)RNA or Chk‐shRNA lentivirus. These data suggest that systemically delivered agents that downregulate Chk‐α in tumors will not affect endothelial cell proliferation during delivery, and further support the development of Chk‐α downregulation as a cancer‐specific treatment. Copyright © 2013 John Wiley & Sons, Ltd.     

Genistein inhibits DNA methylation and increases expression of tumor suppressor genes in human breast cancer cells

It has been previously demonstrated that genistein exhibits anticancer activity against breast cancer. However, the precise mechanisms underlying the anticancer effect of genistein, in particular the epigenetic basis, remain unclear. In this study, we investigated whether genistein could modulate the DNA methylation status and expression of cancer‐related genes in breast cancer cells. We treated MCF‐7 and MDA‐MB‐231 human breast cancer cells with genistein in vitro. We found that genistein decreased the levels of global DNA methylation, DNA methyltransferase (DNMT) activity and expression of DNMT1. Yet, the expression of DNMT3A and DNMT3B showed no significant change. Using molecular modeling, we observed that genistein might directly interact with the catalytic domain of DNMT1, thus competitively inhibiting the binding of hemimethylated DNA to the catalytic domain of DNMT1. Furthermore, genistein decreased DNA methylation in the promoter region of multiple tumor suppressor genes (TSGs) such as ataxia telangiectasia mutated (ATM), adenomatous polyposis coli (APC), phosphatase and tensin homolog (PTEN), mammary serpin peptidase inhibitor (SERPINB5), and increased the mRNA expression of these genes. However, we detected no significant changes in the DNA methylation status or mRNA expression of stratifin (SFN). These results suggest that the anticancer effect of genistein on breast cancer may be partly due to its ability to demethylate and reactivate methylation‐silenced TSGs through direct interaction with the DNMT1 catalytic domain and inhibition of DNMT1 expression. © 2014 Wiley Periodicals, Inc.     

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。