腺苷抑制乳腺癌细胞增殖和迁移的机制

目的:检测腺苷对乳腺肿瘤细胞增殖及迁移能力的影响,并探究其潜在的分子机制。方法:以MCF-7细胞为模型,采用梯度浓度的腺苷处理细胞,MTT及细胞计数法检测腺苷对细胞增殖的影响,流式细胞术检测腺苷对细胞凋亡及周期的影响,划痕修复实验检测腺苷对细胞迁移能力的影响。结果:腺苷可显著抑制MCF-7细胞增殖,且抑制效果与腺苷浓度及作用时间呈相关性。流式细胞术检测结果表明腺苷可诱导MCF-7细胞凋亡,并引起细胞的 G2/M期阻滞。划痕实验结果表明腺苷抑制MCF-7细胞的迁移能力。实时定量PCR检测结果发现,促细胞凋亡分子Bax及Bak表达量显著升高,而凋亡抑制分子Bcl-2表达量显著下降,同时Caspase-3的表达量也显著升高。结论:腺苷可诱导MCF-7细胞凋亡,抑制细胞的增殖,同时腺苷可以抑制MCF-7细胞的迁移能力。腺苷诱导MCF-7细胞凋亡与其激活线粒体凋亡通路密切相关。     

Comparing Apoptosis and Necrosis Effects of Arctium Lappa Root Extract and Doxorubicin on MCF7 and MDA-MB-231 Cell Lines

Objective: Breast cancer is a heterogeneous disease and very common malignancy in women worldwide. The efficacy of chemotherapy as an important part of breast cancer treatment is limited due to its side effects. While pharmaceutical companies are looking for better chemicals, research on traditional medicines that generally have fewer side effects is quite interesting. In this study, apoptosis and necrosis effect of Arctium lappa and doxorubicin was compared in MCF7, and MDA-MB-231 cell lines. Materials and Methods: MCF7 and MDA-MB-231 cells were cultured in RPMI 1640 containing 10% FBS and 100 U/ml penicillin/streptomycin. MTT assay and an annexin V/propidium iodide (AV/PI) kit were used respectively to compare the survival rate and apoptotic effects of different concentrations of doxorubicin and Arctium lappa root extract on MDA-MB-231 and MCF7 cells. Results: Arctium lappa root extract was able to reduce cell viability of the two cell lines in a dose and time dependent manner similar to doxorubicin. Flow cytometry results showed that similar to doxorubicin, Arctium Lappa root extract had a dose and time dependent apoptosis effect on both cell lines. 10μg/mL of Arctium lappa root extract and 5 μM of doxorubicin showed the highest anti-proliferative and apoptosis effect in MCF7 and MDA231 cells. Conclusion: The MCF7 (ER/PR-) and MDA-MB-231 (ER/PR+) cell lines represent two major breast cancer subtypes. The similar anti-proliferative and apoptotic effects of Arctium lappa root extract and doxorubicin (which is a conventional chemotherapy drug) on two different breast cancer cell lines strongly suggests its anticancer effects and further studies.     

电化学治疗对具多药耐药表型的人乳腺癌细胞MCF-7adr的作用

目的：研究电化学治疗（ＥＣＴ）对具多药耐药表型的人乳腺癌细胞ＭＣＦ－７＾ａｄｒ的作用。方法：以敏感型人乳腺细胞ＭＣＦ－７为对照,采用细胞计数法观察ＥＣＴ对乳腺癌耐药细胞株ＭＣＦ－７＾ａｄｒ的抑制效应,以ＡｎｎｅｘｉｎＶ标记法观察ＥＣＴ的诱导ＭＣＦ－７＾ａｄｒ细胞凋亡的作用。结果：ＥＣＴ对耐药细胞ＭＣＦ－７＾ａｄｒ的诱导凋亡及抑制效应接近于其对敏感细胞ＭＣＦ－７的作用,无显著性差异（Ｐ〉０．０５）。     

Huaier aqueous extract inhibits proliferation of breast cancer cells by inducing apoptosis

Aqueous extract of Trametes robiniophila murr (Huaier) has been commonly used in China for cancer complementary therapy in recent years; however, the mechanisms of its anticancer effects are largely unknown. In the present study, we aim to investigate its inhibitory effect on both MCF‐7 and MDA‐MB‐231 cells, and explore the possible mechanisms of its anticancer effect. Cell viability and motility were measured by MTT and invasive assays, migration and scratch assays in vitro, respectively. The distribution of cell cycle, PI‐Annexin‐V staining and Rhodamine 123 assay were analyzed by flow cytometry, and western blot were used to test the apoptotic pathways. We found that Huaier extract could strongly inhibit cell viability of MCF‐7 and MDA‐MB‐231 cells in a time‐ and dose‐dependent manner; however, MDA‐MB‐231 cells showed more susceptibility to the treatment. Furthermore, cell invasiveness and migration were also suppressed with exposure to Huaier extract. We also indicated that Huaier could induce G0/G1 cell‐cycle arrest, p53 accumulation and activation selectively in MCF‐7 cells. Inspiringly, the PI‐Annexin‐V staining assay and western blot analysis confirmed cell apoptosis executed by caspase‐3. Decreased mitochondrial membrane potential by Rhodamine 123 assay and down‐regulation of Bcl‐2 and up‐regulation of BCL2‐associated X protein (BAX) indicated that Huaier induced apoptosis through the mitochondrial pathway. Caspase activation during Huaier‐induced apoptosis was confirmed by pan‐caspase inhibitor, Z‐VAD‐fmk. As expected, the inhibitor decreased Huaier‐induced apoptosis in both cell lines. Based on our findings, Huaier can induce cell apoptosis in both ER‐positive and ER‐negative breast cancer cell lines and is an effective complementary agent for breast cancer treatment. (Cancer Sci 2010; 101: 2375–2383)     

Bcl2-negative MCF7 cells overexpress p53: implications for the cell cycle and sensitivity to cytotoxic drugs

PURPOSE: Bcl2 is a mitochondrial protein endowed with cytostatic and antiapoptotic activities. In this work we studied the effects of the lack of Bcl2 in MCF7 cells. METHODS: The breast cancer cell line MCF7 (Bcl2-positive) and its derivative MCF7/50B (Bcl2-negative) were compared in terms of the level of p53 expression, doubling time and distribution of cells among the cycle phases. Sensitivities to the proapoptotic drugs cisplatinum and staurosporine were measured using a clonogenic assay and the contribution of apoptosis to cytotoxicity was determined with a mitochondrial membrane potential-sensitive dye. RESULTS: Relative to MCF7, MCF7/50B cells overexpressed p53 and slowly proliferated with a significant accumulation at G(0)/G(1) and depletion in S phase. The cytotoxicity of the DNA-damaging agent cisplatinum was decreased, while that of the protein kinase inhibitor staurosporine was increased. The induced cytotoxicity was essentially due to apoptosis and necrosis, respectively. CONCLUSIONS: These results suggest that the lack of Bcl2 accompanied by p53 overexpression affects the distribution of cells among the cell cycle phases and modifies the sensitivity to cytotoxic drugs and the type of cell death.     

PAK5通过上皮-间质转化促进人乳腺癌细胞侵袭

目的:探讨p21活化激酶-5（p21-activated kinase 5,PAK5）蛋白对乳腺肿瘤细胞侵袭转移的作用机制。方法:观察PAK5过表达对乳腺癌细胞形态的影响,人乳腺肿瘤细胞MCF-7通过慢病毒感染稳定表达Flag-PAK5。然后提取感染细胞的总蛋白进行蛋白免疫印迹检测上皮-间质转化（EMT）标志物上皮-钙黏蛋白（E-cadherin）,纤维连接蛋白（Fibronectin）和波形蛋白（vimentin）的表达。最后通过Transwell实验检测过表达PAK5对乳腺癌细胞迁移和侵袭的影响。结果:过表达PAK5蛋白能够使细胞形态由鹅卵石样像梭形变化,下调E-cadherin蛋白,促进乳腺癌细胞迁移和侵袭。结论:PAK5可能参与调节乳腺肿瘤细胞发生上皮－间质转化,促进乳腺肿瘤侵袭转移的发生。     

CisoDGR 多肽对乳腺癌 MCF －7细胞增殖、凋亡的影响及其机制探讨

目的：探讨 CisoDGR 多肽对乳腺癌 MFC －7细胞增殖和凋亡的影响及可能机制。方法：采用 MTT 法检测 CisoDGR 多肽对乳腺癌 MCF －7细胞的抑制率;流式细胞术检测 CisoDGR 多肽对 MCF －7细胞凋亡的影响;Western blot 法检测 Caspase －3、Bcl －2蛋白的表达。结果：CisoDGR 多肽能明显抑制乳腺癌 MCF －7细胞的增殖,诱导细胞凋亡,并存在一定的时－效及量－效关系。其对凋亡的诱导作用可能与 Caspase －3蛋白表达增加及 Bcl －2蛋白表达下降有关。结论：CisoDGR 多肽具有抑制 MCF －7细胞增殖,诱导 MCF －7细胞凋亡的作用,其作用机制可能与 Caspase －3、Bcl －2蛋白的表达变化有关。     

新型环四肽HDAC抑制剂的化学合成及其对乳腺癌细胞增殖和迁移的抑制作用

目的:化学合成新型环四肽组蛋白去乙酰化酶（histone deacetylase,HDAC）抑制剂并探索其对抗乳腺癌的作用及机制。方法:基于天然环四肽chlamydocin的化学结构特征优化设计新型环四肽HDAC抑制剂。应用CCK8、Hoechst染色、流式细胞仪以及划痕实验等方法评价该抑制剂的抗乳腺癌活性。Western blot方法被用于初步探索该抑制剂的可能作用机制。结果:质谱结果显示我们成功合成了新型环四肽HDAC抑制剂。细胞学检测发现,该抑制剂可显著抑制乳腺癌细胞系T47D和MCF7的细胞增殖和细胞迁移。环四肽HDAC抑制剂对MCF7和T47D的IC50分别为3.0 nmol/L和2.5 nmol/L。细胞凋亡检测结果提示HDAC抑制剂处理细胞后,细胞凋亡水平显著增强。此外,经过该抑制剂处理之后,APOE蛋白表达水平显著上调,而SREBP2和HMGCR蛋白表达水平显著下调,提示环四肽HDAC抑制剂在脂代谢方面的潜在作用。结论:新型合成的环四肽HDAC抑制剂可有效抑制乳腺癌细胞增殖和迁移,或有望为乳腺癌治疗提供新的治疗药物。     

β-Lapachone对乳腺癌细胞增殖、迁移和凋亡的作用及机制

目的:探索β-Lapachone与乳腺癌细胞MCF-7和MFM223的细胞增殖、迁移和凋亡作用及机制。方法:采用β-Lapachone以不同浓度处理乳腺癌细胞MCF-7和MFM223,不同时间点后,进行MTT,细胞克隆实验,细胞增殖毒性实验,划痕实验,观察给药后对细胞的增殖和迁移能力,凋亡实验验证给药后对乳腺癌细胞的凋亡作用,Western blot实验检测迁移和凋亡相关蛋白的表达水平。结果:与对照组相比,β-Lapachone给药后乳腺癌细胞增殖,迁移能力随着浓度的增加而降低,凋亡相关蛋白水平与β-Lapachone给药浓度呈正相关,细胞中迁移相关蛋白（MMP-2/9、Ezrin、vimentin、Snail、GSK-3β）表达明显下调（P<0.05）,凋亡相关蛋白（Caspase-3/8/9）明显上调,BCL-2/Bax的比值下降（P<0.05）。结论:β-Lapachone能够有效抑制乳腺癌细胞增殖能力,通过EMT 途径抑制乳腺癌细胞迁移,Caspase依赖途径诱导乳腺癌细胞的凋亡。     

lncBRM对乳腺癌细胞生长的影响及作用机制

目的  探讨Brahma相关长链非编码RNA （long non-coding RNA for association with Brahma,lncBRM）对人乳腺癌细胞系（MCF-7、MDA-MB-453）生长、迁移和侵袭的影响及可能的作用机制。方法 采用RT-PCR实验检测lncBRM在不同乳腺癌细胞（MCF-7、 ZR-75-30、BT474、MDA-MB-231和MDA-MB-453）和正常人乳腺上皮细胞株MCF 10A中的表达;利用siRNA在MCF-7、MDA-MB-453细胞中敲低lncBRM,分别转染si-lncBRM质粒（si-lncBRM组）和空载质粒（si-Ctrl组）,采用CCK-8实验检测细胞增殖情况,流式细胞术检测细胞凋亡情况,Transwell小室实验检测细胞侵袭和迁移能力,采用Western blot检测迁移相关蛋白E-cadherin和N-cadherin的表达水平,并采用miRDB数据库预测lncBRM靶点。结果 lncBRM在不同乳腺癌细胞中的表达水平均高于正常人乳腺上皮细胞株MCF 10A （P<0.01）。si-Ctrl组比较,敲低lncBRM可抑制MCF-7、MDA-MB-453细胞增殖能力（P<0.05）,提高细胞凋亡率（P<0.01）,细胞侵袭和迁移细胞数目较少（均P<0.01）;同时E-cadherin表达明显上调,而N-cadherin表达下调（均P<0.01）。miRDB数据库预测发现lncBRM和68个miRNAs存在结合位点,敲低lncBRM导致评分最高的前5个miRNA中的4个（miR-4646-5p、miR-204-3p、miR-204-5p和miR-6832-3p）表达上调。结论 lncBRM可能通过调控miRNAs的表达而抑制乳腺癌细胞的增殖、侵袭和迁移并诱导其凋亡。     

Nuclear transport receptor karyopherin-α2 promotes malignant breast cancer phenotypes in vitro

Tumorigenesis and tumor progression are associated with dysfunction of the nuclear transport machinery at the level of import and export receptors (karyopherins). Recent studies have shown that the nuclear import factor karyopherin-α2 (KPNA2) is a novel prognostic marker for poor prognosis in human breast cancer. Based on the well-defined hallmarks of cancer progression, we performed a detailed in vitro characterization of the phenotypic effects caused by KPNA2 overexpression and KPNA2 silencing in benign and malignant human breast cells. KPNA2 overexpression clearly increased proliferation of MCF7 tumor cells and further led to a reduction of cell-matrix adhesion in benign MCF10A cells, whereas cell migration was significantly increased (P<0.0001) in both tumor models. Remarkably, these individual effects of KPNA2 overexpression on proliferation, cell-matrix adhesion and migration resulted in an increased colony spreading of benign MCF10A breast cells and malignant MCF7 tumor cells (P<0.001), which is a hallmark of cancer progression. Conversely, RNA interference-mediated KPNA2 silencing caused a complete inhibition of MCF7 tumor cell proliferation and migration (P<0.0001). In addition, in these experiments apoptosis was increased (P<0.05) and formation of tumor cell colonies was reduced (P<0.01). Thus, KPNA2 overexpression provoked increased aggressiveness of malignant MCF7 breast tumor cells and induced a shift in benign MCF10A breast cells toward a malignant breast cancer phenotype. In conclusion, we demonstrate for the first time in experimental tumor models that forced KPNA2 expression drives malignant features relevant for breast cancer progression, while its silencing is required for the remission of those progressive phenotypes. This study gives clear evidence that KPNA2 acts as a novel oncogenic factor in human breast cancer, in vitro.     

Inhibition of proliferation and induction of apoptosis in human breast cancer cells by lauryl gallate

Lauryl gallate is an antioxidant food additive showing low toxicity to normal cells. Here, its antiproliferative effect has been studied on three human breast cancer cell lines: estrogen-dependent, wild-type p53, MCF7; estrogen-independent, non-functional p53, MDA-MB-231 and MCF7 ADR, which overexpresses P-glycoprotein (P-gp) and displays a multidrug-resistant phenotype. Lauryl gallate inhibited proliferation and induced cell cycle alterations in all three cell lines without altering P-gp functionality in the drug-resistant cells. A stable arrest in G(1) phase was observed in MCF7, while a slow-down of cell cycle progression was induced in the other two cell lines. Lauryl gallate increased p53 expression only in MCF7, and upregulated p21(Cip1) and reduced cyclin D1 levels in all three cell lines. The induction of apoptosis, demonstrated by annexin V-FITC labeling, PARP cleavage and mitochondrial membrane depolarization and morphological alterations, were clearly detected in MCF7 ADR and MDA-MB-231 and to a minor extent in MCF7. Overexpression of Bcl-2 in MCF7 ADR cells demonstrated its protective role against morphological alterations and apoptosis. Lauryl gallate induction of p21(Cip1) and apoptosis observed in all three cell lines was regulated by Erk1/2 activation. These findings suggest a potential use of lauryl gallate against tumors harboring p53 mutations and drug-resistant phenotypes.     

下调Skp2表达诱导乳腺癌MCF-7细胞凋亡

目的 探讨在乳腺癌细胞系MCF-7中下调S期激酶相关蛋白(Skp2)表达诱导细胞凋亡及其机制。方法 应用RNAi方法在体外下调乳腺癌细胞系MCF-7中Skp2的表达水平,48小时后表阿霉素处理细胞,TUNEL和Hoechst 33258染色检测凋亡,Western Blot检测细胞周期调控相关因子及凋亡相关蛋白表达情况,研究其机制。结果 下调MCF-7中Skp2表达水平后,乳腺癌细胞凋亡增加。下调Skp2使p27、p21和CyclinE蛋白表达水平升高。表阿霉素处理MCF-7细胞后,Skp2蛋白水平下调。Skp2 siRNA与表阿霉素有协同诱导凋亡的作用,p53蛋白水平升高。结论 p27、p21和CyclinE在通过下调Skp2诱导的凋亡中发挥作用。Skp2 siRNA和表阿霉素协同诱导细胞凋亡,与p53依赖的凋亡途径有关。Skp2可能是乳腺癌治疗的靶点。     

Vitex Rotundifolia Fractions Induced Apoptosis in Human Breast Cancer T-47D Cell Line via Activation of Extrinsic and Intrinsic Pathway

Objective: Breast cancer is the most frequently diagnosed cancer worldwide. The main objective of the present study was to evaluate the cytotoxic effects and mechanism of cell death induced by the extract and fractions of Vitex rotundifolia (leaves) in breast cancer cell line, T-47D. Methods: The cytotoxicity activity was measured using MTS assay. The mode of cell death was analysed by early (phosphatidylserine externalization) and late apoptosis (DNA fragmentation). The caspases 8, 9, 3/7 and apoptotic proteins bax, bcl-2 study were done by western blot and ELISA method. Results: The methanol extract was found to inhibit 50% growth of T-47D cells at the concentration of 79.43µg/ml respectively after 72hr. From seven fractions, fraction F1, F2 and F3 produced cytotoxicity effects in T-47D cell line with IC50 (72hr) < 30µg/ml. The results obtained by Annexin V/PI apoptosis detection assay and TUNEL assay suggest that active fractions of  Vitex rotundifolia induced early and late apoptosis (DNA fragmentation) in T-47D cell line. Moreover, western blot analysis and Caspase GloTM luminescent assay demonstrated that fractions F2 and F3 triggered apoptotic cell death via activation of caspases -8, -9 and -3/7 and up-regulation of  Bax and down-regulation of Bcl-2 protein.  Furthermore, chemical profiling confirms the presence of potential metabolites (vitexicarpin) in fractions of Vitex rotundifolia. Conclusion: Thus, the present study suggests the remarkable potential of active metabolites in fractions of Vitex rotundifolia as future cancer therapeutic agent for the treatment of breast cancer.     

环氧化酶-2抑制剂nimesulide对乳腺癌细胞株增生、凋亡的影响

目的 探讨环氧化酶-2抑制剂nimesulide(NIM)对雌激素受体(ER)阴性(MDA-MB．231)和阳性(MCF-7)人乳腺癌细胞株增生、凋亡的影响。方法 应用MTT比色法分析细胞生长抑制作用，流式细胞技术测定细胞周期分布和凋亡率，透射电镜观察细胞形态与超微结构，AnnexinV法检测细胞的凋亡。结果 NIM以时间、剂量依赖性方式抑制MDA-MB-231(COX-2阳性)、MCF-7(COX-2阴性)细胞生长，阻滞细胞周期于G0／G1期，诱导细胞的凋亡，MDA—MB-231细胞对NIM的作用更为敏感。NIM对COX-2表达阴性的MCF-7细胞同样具有抑制增生、诱导凋亡的作用。结论 NIM对ER阳性和ER阴性乳腺癌细胞均有抑制增生、诱导凋亡的作用。NIM的抗肿瘤作用存在环氧化酶．2依赖性与非依赖性两种途径。     

Estrogen Receptor Beta (ERβ) May Act as Mediator in Apoptotic Induction of Grape Seed Extract (GSE)

Background: Grape seed extract is a complex mixture of polyphenols. Its anti-tumor effects have been reported by several studies. Estrogen receptors (ERs) are commonly considered as important markers for breast cancer. The present study aimed to evaluate the apoptotic effects of GSE on MCF7 breast cancer cells and assessed the expression of ERβ during treatment of cells with GSE. Material and Methods: The half maximal inhibitory concentration (IC50) of GSE in MCF7 breast cancer cells were calculated by treating cells with serial dilution of GSE for 48 hours and cell viability evaluated using MTT assay. Then cells assigned to three groups: control (no treatment), DMSO (cells treated with 0.05% of DMSO) and GSE group (cells treated with of GSE for 48 hours). The apoptosis assay was performed by detecting Annexin V protein by flow cytometry. The gene expression of ERβ and caspase-3 was evaluated by Real-Time PCR. Results: Cells in GSE group treated with GSE IC50 concentration for 48 hours. Annexin V staining assay, represented early apoptosis detected by flow cytometry analysis showed significantly higher expression (p<0.01) than control and DMSO groups. Moreover, results of Real-Time PCR showed a significant expression in ERβ and caspase-3 genes in GSE group compared to control and DMSO groups (Fold change = 2.3 and 3.5, respectively). Conclusion: GSE may induce apoptosis in MCF7 human breast cancer cells by activation of ERβ gene.     

NFATc1可能通过调节RhoA/ROCK信号通路影响乳腺癌细胞的增殖与凋亡

目的:检测NFATc1在乳腺癌患者癌及癌旁组织的表达,并探讨其表达对乳腺癌细胞增殖和凋亡的影响及机制。方法:收集于我院就诊的39例乳腺癌患者癌及癌旁组织,采用RT-PCR技术、免疫印迹及免疫组化染色技术检测NFATc1在乳腺癌组织及癌旁组织中的表达状况。利用小干扰RNA（siRNA）构建NFATc1稳定敲除的MCF7及MDA-MB-231细胞系。利用CCK-8试剂盒及克隆形成实验检测NFATc1敲除对乳腺癌细胞增殖的影响,同时利用Ki67染色检测对照组和NFATc1敲除组乳腺癌细胞中Ki67阳性细胞的比例。此外,采用流式细胞学技术检测NFATc1基因敲除对乳腺癌细胞凋亡的影响,最后利用免疫印迹技术分析各组细胞RhoA/ROCK信号通路的表达状况。结果:NFATc1在乳腺癌患者癌组织中的mRNA及蛋白表达显著增高（P＜0.05）。流式细胞学结果表明NFATc1 siRNA干预能够显著促进两组乳腺癌细胞系的凋亡（P＜0.05）。此外,Ki67染色、CCK-8实验及克隆形成实验结果表明NFATc1敲除后两种乳腺癌细胞系的增殖能力明显下降（P＜0.05）。免疫印迹结果揭示,NFATc1敲除能够明显抑制癌细胞中RhoA/ROCK信号通路的激活（P＜0.05）。结论:NFATc1可能通过调控RhoA/ROCK信号通路进而促进乳腺癌细胞增殖,有望成为治疗乳腺癌的新靶点。     

增殖细胞核抗原与p55PIK结合调控乳腺癌细胞MCF7增殖的研究

目的 观察p55PIK对乳腺癌细胞MCF7细胞周期及增殖的影响,并探讨其可能的机制。方法 通过转染质粒或特异性siRNA,在乳腺癌MCF7细胞中过表达或低表达p55PIK,继而通过免疫印迹法检测p55PIK的表达,通过BrdU/PI双掺入法测定细胞DNA合成及细胞周期,并用CCK-8（cellcounting kit-8）试剂盒检测细胞增殖,最后通过免疫共沉淀技术检测明确p55PIK是否可以与增殖细胞核抗原（proliferating cell nuclear antigen,PCNA）相结合。 结果 p55PIK过表达质粒及siRNA可分别使MCF7细胞中p55PIK成功过表达或低表达,而且过表达p55PIK可加快MCF7细胞的DNA合成,p55PIK组[DNA合成比率为（56.33±1.63）%]与Vector组[DNA合成比率为（26.27±1.85）%]比较差异有统计学意义（P<0.01）,过表达5PIK促进MCF7细胞从G0/G1期进入S期,从而调节其增殖,p55PIK组[OD450nm:（1.46±0.04）]与Vector组[OD450nm:（1.16±0.16）]比较差异有统计学意义（P<0.05）,而低表达p55PIK可抑制上述过程。免疫共沉淀证实p55PIK与PCNA之间可以相结合。 结论 p55PIK可促进乳腺癌细胞MCF7细胞周期进程及增殖,而且p55PIK可与PCNA相结合。     

下调FAM111B对乳腺癌细胞增殖和凋亡的影响

目的:探讨下调FAM111B对乳腺癌细胞系MDA-MB-231和MCF7细胞增殖和凋亡的影响及其机制。方法:构建siR-FAM111B慢病毒载体,转染乳腺癌MDA-MB-231和MCF7细胞,qRT-PCR检查转染组与对照组FAM111B mRNA表达,Western blotting法检测各组细胞FAM111B蛋白表达。用CCK-8法检测细胞的增殖能力。流式细胞术检测Annexin-V/PI双染各组细胞的凋亡情况。Western blotting法检测凋亡相关蛋白Bax和Bcl-2的表达。结果:siR-FAM111B成功转染MDA-MB-231和MCF7细胞,转染后应用qRT-PCR和Western blotting检测,结果显示,FAM111B mRNA与蛋白水平均下调。siR-FAM111B能抑制两种细胞的增殖。Annexin-V/PI双染结果显示,下调FAM111B诱导两种细胞凋亡。Western blotting结果显示,下调FAM111B可以促进两种细胞Bax的表达,抑制Bcl-2的表达。结论:下调FAM111B能够抑制乳腺癌细胞的增殖,通过调节线粒体凋亡通路诱导细胞凋亡。     

BCYRN1对乳腺癌细胞MCF7和小鼠移植瘤增殖和转移的影响

目的 研究RNA干扰lncRNA BCYRN1对乳腺癌细胞MCF7和小鼠移植瘤的增殖和转移的影响。 方法 BCYRN1 siRNA和siRNA scramble（对照组）分别转染乳腺癌细胞MCF7。CCK-8检测细胞增殖;蛋白印迹法检测细胞中蛋白的表达;划痕实验分析细胞运动能力;免疫组织化学法检测肿瘤组织中蛋白的表达。 结果 与对照组相比,细胞增殖倍数明显降低（P=0.02）;且细胞增殖核抗原-67（antigen identified by monoclonal antibody, Ki-67）和增殖细胞核抗原（proliferating cell nuclearantigen, PCNA）表达显著减弱（P=0.03）。BCYRN1 siRNA处理后,乳腺癌MCF7细胞运动能力减弱,血管内皮细胞生长因子（vascular endothelial growth factor, VEGF）和基质金属蛋白酶9（matrixmetalloprotein 9, MMP-9）表达受到抑制（P=0.04）。体内实验表明,BCYRN1 siRNA组小鼠肿瘤的体积明显小于对照组（P=0.03）,且BCYRN1 siRNA可以抑制MCF7小鼠移植瘤肿瘤组织Ki-67和MMP-9的表达。 结论 BCYRN1 siRNA可以抑制乳腺癌细胞MCF7和小鼠的增殖和转移