上调结肠癌间充质干细胞中miR-93-5p表达抑制结肠癌细胞增殖及促进凋亡的机制探讨

目的:观察miR-93-5p上调的结肠癌间充质干细胞（colon cancer mesenchymal stem cell,CCMSC）对结肠癌细胞增殖、凋亡的影响,并初步探讨其机制。方法:以贴壁细胞培养法抽提癌组织CCMSC,从正常结肠组织抽提结肠间充质干细胞（colon mesenchymal stem cell,CMSC）,观察miR-93-5p及PD-L1的表达差异;以拟似剂上调CCMSC中miR-93-5p表达,CCK8法及流式细胞术检测CCMSC诱导的SW480细胞增殖及凋亡变化。结果:miR-93-5p在结肠癌细胞株中表达低于正常结肠上皮细胞（P＜0.001）,PD-L1 mRNA和PD-L1蛋白在结肠癌细胞株中表达高于正常结肠上皮细胞（P＜0.001,P＜0.001）;miR-93-5p在CCMSC组中表达明显低于CMSC（P＜0.001）;与SW480细胞比较,给予CCMSC干预后SW480细胞存活率上升（P＜0.001）,凋亡率下降（P＜0.05）,与SW480细胞或CCMSC/SW480细胞比较,给予转染miR-93-5p mimics CCMSC干预的SW480细胞存活率下降（P＜0.01,P＜0.001）,凋亡率上升（P＜0.05,P＜0.01）。结论:上调CCMSC中miR-93-5p通过靶向调控PD-L1抑制结肠癌细胞增殖,促进凋亡。     

七氟烷通过抑制PI3K磷酸化抑制结肠癌SW480 细胞的增殖和侵袭以及裸鼠移植瘤的生长

目的：探讨七氟烷（sevoflurane）通过调控PI3K磷酸化对结肠癌SW480 细胞增殖和侵袭以及裸鼠移植瘤生长的影响及其机制。方法：采用七氟烷处理结肠癌SW480 细胞,将细胞随机分为对照组、0.5%七氟烷组、1.0%七氟烷组和2.0%七氟烷组进行后续实验。用克隆形成实验检测SW480 细胞的增殖能力,RT-PCR 检测细胞中MDM2、survivin mRNA表达水平,Transwell小室法检测细胞的侵袭能力,Western blotting 检测细胞中MDM2、survivin、VEGF、PI3K、p-PI3K、AKT、p-AKT 蛋白的表达水平。并加入PI3K激活剂740 Y-P 进行验证。建立裸鼠SW480 细胞移植瘤模型,称取肿瘤质量,免疫组化检测移植瘤组织中MDM2 和VEGF阳性表达率。结果：与对照组和低剂量组比较,1.0%和2.0%七氟烷组SW480 细胞的克隆形成率显著降低（均P<0.01）;细胞中MDM2 mRNA和蛋白水平显著升高（均P<0.01）,survivin mRNA和蛋白水平显著降低（均P<0.01）;SW480 细胞侵袭数显著降低（P<0.01）,VEGF、p-PI3K/PI3K、p-AKT/AKT 蛋白水平显著降低（均P<0.01）。740Y-P 可逆转七氟烷对SW480 细胞增殖、侵袭及PI3K/AKT信号通路相关蛋白表达的影响。2.0%七氟烷组小鼠移植瘤质量显著降低（P<0.01）,瘤组织中MDM2 阳性表达率显著升高（P<0.01）、VEGF阳性表达率显著降低（P<0.01）。结论：七氟烷抑制结肠癌SW480 细胞的增殖和侵袭以及裸鼠移植瘤的生长,其作用机制可能是通过抑制PI3K磷酸化实现的。     

c-myc反义寡核苷酸对表达FHIT基因的结肠癌细胞增殖及凋亡作用的影响

目的：观察脂质体介导的c—myc反义寡核苷酸对表达FHIT基因的结肠癌细胞增殖及凋亡作用的影响。方法：用脂质体法将重组FHIT基因的PRC／CMV质粒和空载体质转染到人结肠细胞株SW480，随后分别转染c—myc反义寡核苷酸。Western blot法检测细胞FHIT和c—myc的表达；MTF法检测细胞的增殖；AO／EB染色法和流式细胞分析技术检测细胞的凋亡。结果：转染FHIT基因后，SW480细胞有明显的FHIT蛋白表达而转染空载体的细胞未检测到FHIT蛋白表达。C—myc反义寡核苷酸转染后，对SW480细胞c—myc的表达有明显的抑制作用（P〈0．01）；对FHIT＋／-SW480细胞的增殖均有明显的抑制作用（P〈0．01），且对FHIT＋SW480细胞的抑制作用明显强于FHIT—SW480细胞（P〈0．05）。同时，c-myc反义寡核苷酸对FHIT＋／-SW480细胞的凋亡均有明显的促进作用，对FHIT＋SW480细胞凋亡的促进作用明显强于FHIT—SW480细胞（P〈0．05）。结论：FHIT基因的表达和癌基因c—myc的表达抑制共同作用可以发挥较强的抗肿瘤细胞的效果，为多基因联合干预治疗肿瘤奠定了理论基础。     

阿司匹林对人结肠癌细胞株SW480、HT29中VEGF、β-catenin表达的影响

目的 探讨阿司匹林对人结肠癌细胞株HT-29、SW480生长增殖的影响及其β-catenin、VEGF蛋白和mRNA的表达,并为结直肠癌的预防和治疗提供新的实验和理论依据。方法 采用MTT法检测阿司匹林对SW480、HT-29细胞生长增殖的影响;Real-time PCR和Western blot法检测HT-29、SW480细胞中VEGF、β-catenin mRNA及蛋白的表达情况。结果 在SW480、HT-29细胞的生长增殖过程中,阿司匹林对其有着显著的抑制作用,且具有量效、时效关系;除6 h干预组外,余各组阿司匹林均可抑制VEGF、β-catenin蛋白和mRNA的表达（P＜0.05）。结论 阿司匹林对人结直肠癌细胞株SW480、HT-29的生长增殖具有显著的抑制作用,并对SW480、HT-29中VEGF、β-catenin mRNA和蛋白质的表达具有显著的下调效应;而阿司匹林通过抑制β-catenin的表达,同时调节VEGF抑制肿瘤血管的生成可能是其预防和治疗结直肠癌的作用机制之一。     

生存素siRNA表达质粒对结肠癌细胞侵袭和增殖能力的抑制作用

 目的 构建针对生存素的小分子RNA干扰表达质粒，研究siRNA表达质粒沉默生存素基因后对大肠癌细胞株SW480侵袭性和增殖性的影响。方法 用pRNAT U6.1/Neo载体构建生存素 siRNA表达质粒（pRNAT/sur siRNA），该质粒转染SW480细胞株48小时后，用Westeron blot和半定量 RT PCR分析生存素蛋白和mRNA表达的变化。G418 400μg/L筛选阳性克隆细胞株（sur siRNA/SW480），MTT法检测SW480细胞体外增殖的变化；细胞侵袭性实验研究SW480细胞的侵袭性变化。结果 成功地构建了pRNAT/sur siRNA表达质粒，并且该质粒明显下调SW480细胞生存素蛋白和mRNA的表达水平，分别下调85%，80%。G418 400μg/L筛选出转染pRNAT/sur siRNA的SW480细胞株（sur siRNA/SW480）；sur siRNA/SW480细胞增殖受到显著抑制，抑制率为37.4% (P<0.01)；细胞侵袭实验示sur siRNA/SW480细胞的穿透数为(153±66)个，而对照组pRNAT/SW480、SW480细胞的穿透数为(505±65)，(578±98)个细胞，sur siRNA/SW480细胞的穿透数与对照组相比显著减少(P<0.01)。结论 针对生存素siRNA可以显著降低生存素的表达，抑制肿瘤细胞的增殖和侵袭，该生存素siRNA序列可能成为治疗结肠癌的一种有效手段。     

突变型p27基因对大肠癌生物学行为的影响

Objective: To observe the influence of human mutant p27 gene (p27mt) on the growth and apoptosis of colon can-cer cells so as to investigate the function mechanism of p27mt in gene therapy for colon cancer. Methods: Colon cancer cell line SW480 was infected with recombinant replication defective adenovirus Ad-p27mt, and expression of p27mt protein was detected by Western blot; the inhibition effect of p27mt on SW480 cells was detected with cytometry. Cell cycle was decided with flow cytometer, and DNA fragment analytic process identified the occurrence of apoptosis. Results: After transfected SW480 cells with Ad-p27mt, high expression of p27 protein was identified with immunoblotting assay. PI staining and flow cytometer assay showed 77.96% colon cancer cells was blocked in phase G0/G1, while in Ad-LacZ group and blank control group, 27.57% and 25.29% cells were blocked in the same phase, respectively. Growth curve showed Ad-p27mt has an obvious inhibition effect on the growth of SW480 cells, DNA fragment assay demonstrated that p27mt was able to induce the apoptosis of colon cancer cells. Conclusion: p27mt has an obvious blocking effect on colon cancer cell cycle, and most cells were blocked in phase G0/G1. This blockage is related with the growth inhibition and apoptosis induction effect of p27mt.     

Anti-K-ras ribozyme induces growth inhibition and increased chemosensitivity in human colon cancer cells

Colon cancer is one of the carcinomas that is resistant to a variety of therapies. To develop a new therapy by regulating the activated K-ras gene in colon cancers, we prepared synthetic DNA encoding the ribozyme (catalytic RNA), and inserted it into an expression vector (LNCX) originated from a retrovirus. Transfection of the vector into SW620 human colon cancer cells brought about significant suppression of K-ras mRNA synthesis and inhibition of the cell growth. Studies in athymic mice, in which K-ras ribozyme-introduced SW620 cells were transplanted, also revealed a marked reduction of tumor growth in vivo. Furthermore, the ribozyme-introduced tumors became more sensitive to treatment with anti-cancer drugs such as cisplatin, adriamycin, 5-fluorouracil, vincristine, and etoposide. These data suggest that the possible efficacy of anti-K-ras ribozyme increases the chemosensitivity of human colon cancers as well as the inhibitory effect on the growth of human colon cancers.     

p53 dependence and apoptosis in response to FP treatment with p53-transfected colon cancer cell lines by use of thin layer collagen gel

The combination of 5-fluorouracil (5-FU) plus Cisplatin (CDDP) (FP treatment) possesses synergistic cytotoxicity against colon cancer. The molecular mechanisms by which chemotherapeutic agents induce apoptosis have been clarified by identifying apoptosis-related genes such p53 and bcl-2. We previously established a new experimental technique in which cancer cells are distributed in thin collagen gel as 1 or 2 cell layers. additionally, we evaluated the efficacy and toxicity of FP treatment in the gastric and colon cancer cell lines, and examined the relationship between the response to FP treatment and apoptosis. In these results we reported transfection of normal p53 gene into p53 mutant and analyzed the impact of the p53 gene in a sensitivity test. In this study, we examined induced apoptosis in colon cancer cell lines and the status of p53 expression in response to treatment of HCT116, COLO320, SW480 and DLD1 with 5-FU alone, CDDP alone and FP treatment under flow cytometric analysis. Transfection of SW480 and DLD1 cells was performed to compare the chemosensitivity of naturally occurring mutant-type p53 SW480 and DLD1 cells with neo-transfected SW480 and DLD1 cells and transfected SW480 and DLD1 cells. Appreciable apoptosis was induced in HCT116 and COLO320 (p53 wild-type) but not in SW480 and DLD1 cells (p53 mutant-type). Transfected SW480 and DLD1 cells underwent significantly more apoptosis (p相似文献   

The mechanisms of 5-FU-PLA-O-CMC-NPS-mediated inhibition of the proliferation of colorectal cancer cell line SW480

We aimed to investigate how 5-FU-PLA-O-CMC-NP (5-FPOCN) inhibits the proliferation of the SW480 colon cancer cell line. Following the treatment of cell line SW480 with 0.1, 1, 10 or 100 μg/ml 5-FPOCN or 5-fluorouracil (fluorouracil, 5-Fu) for 0, 24, 48, or 72, the rate of cell was tested by the tetrazolium assay (MTT). After the SW480 cells were treated with 5-FPOCN or 5-FU for 72 h, the growth rate and apoptosis were detected. After the SW480 cells were treated with 5-FPOCN or 5-FU for 24, 48, 72, or 120, flow cytometry (FCM) was used to determine the cell cycle distribution. The changes in the expression of P21, CyclinD1 and Rb were detected by Western blotting and real-time PCR. We found that different doses of 5-FPOCN can significantly inhibit the growth rate of SW480 cells, and this effect is dose and time dependent. However, there is no significant difference from 72 to 120 h (P?>?0.05). After 5-FPOCN treatment for 72 h, there is a negative correlation between the concentration of 5-FPOCN and the activity of SW480 cells and a positive correlation between the concentration of 5-FPOCN and SW480 cell apoptosis. G1 phase was significantly increased, and S phase was significantly decreased in 5-FPOCN-treated SW480 cells at 72 h compared to the control group (P?<?0.05); there was a positive correlation between the concentration of 5-FPOCN and the above changes. It was suggested that 5-FPOCN can delay G1/S phase and that this is a dose-dependent effect. The expression of P21 protein and messenger RNA (mRNA) and Rb protein and mRNA was significantly increased in 5-FPOCN-treated SW480 cells at 72 h compared to the control group, and this was a dose- and time-dependent effect. CyclinD1 protein and mRNA expression was reduced as the dose increased, and its expression was negatively associated with the increased expression of P21. We concluded that 5-FPOCN can significantly inhibit the growth of colon cancer SW480 cells. 5-FPOCN increased P21 expression and decreased cyclin family and pRb expression to promote cell cycle delay and apoptosis.     

丙氨酰谷氨酰胺对结肠癌细胞FasL基因表达及诱导淋巴细胞凋亡的影响

目的研究丙氨酰谷氨酰胺(A1a-Gln)对人结肠癌SW480细胞FasLmRNA表达及其诱导淋巴细胞凋亡的影响,为进一步研究和应用谷氨酰胺提供依据。方法经体外培养结肠癌SW480细胞株,加入不同浓度的A1a-Gln后收集细胞。应用逆转录-聚合酶链反应(RT-PCR)法检测人结肠癌SW480细胞FasLm-RNA的变化;应用流式细胞术检测SW480细胞诱导淋巴细胞凋亡率的变化。结果RT-PCR法检测结果显示,不同浓度A1a-Gln处理后SW480细胞FasLmRNA表达水平均明显低于对照组(P<0.05);而且FasLmR-NA表达水平随A1a-Gln作用浓度增加而下调,A1a-Gln不同浓度组比较均有显著性差异(P<0.05);流式细胞术检测结果表明,随A1a-Gln作用浓度升高,SW480细胞诱导淋巴细胞凋亡率降低,不同浓度组比较均有显著性差异(P<0.05)。结论在一定浓度范围内,Ala-Gln可下调人结肠癌SW480细胞FasLmRNA的表达,并能抑制肿瘤细胞反向攻击淋巴细胞。     

Survivin基因的shRNA 干扰对结肠癌SW480 细胞增殖和凋亡的影响*

目的:以携带shRNA 片段的腺病毒为载体,对结肠癌细胞SW480 中Survivin基因的表达进行干扰,研究其对肿瘤细胞中Survivin基因沉默效果及对细胞周期、凋亡和增殖的影响。方法:将构建好的携带Survivin-shRNA 片段腺病毒,体外转染结肠癌细胞株SW480。以EGFP为报告基因,采用流式细胞计数测定不同感染复数（MOI）下的转染效率,选取适当病毒浓度进行下一步实验。通过RT-PCR 和Western blot检测基因沉默后结肠癌细胞内Survivin mRNA和蛋白的表达水平;在Annexin V-FITC 和PI染色后通过流式细胞术检测并分析Survivin基因沉默后细胞周期和凋亡的变化;同时采用噻唑蓝（MTT）法、克隆增殖实验对细胞不同时期增殖活性进行观察,明确对细胞增殖的抑制时效性。结果:腺病毒转染后MOI 值在0～50时,剂量与转染效率成正比,确定最佳MOI 值为50并进行后续实验;shRNA 干扰后细胞内Survivin mRNA和蛋白表达水平降低,较对照细胞组差异有统计学意义（P<0.01）。 流式细胞仪检测结果显示基因沉默后细胞凋亡率升高,与对照组相比差异有统计学意义（P<0.01）。 同时基因沉默后,细胞周期也有明显变化,表现为G1/S 期细胞增多和G2/M期细胞减少,与对照细胞组相比差异有统计学意义（P<0.05）。 MTT 和单克隆平板实验均显示Survivin基因的沉默,对细胞的增殖和生长均具有明显抑制作用（P<0.05）。 结论:采用腺病毒对结肠癌进行靶向Survivin基因的shRNA 干扰,能有效降低目的基因的表达。其介导的Survivin基因的沉默,可以有效的诱导结肠癌细胞凋亡,同时Survivin基因可以通过抑制细胞G1/S 期转化来阻止细胞分裂,抑制细胞生长。      

PTTG1促进结肠癌SW480细胞侵袭和迁移的作用机制

目的 研究垂体肿瘤转化基因 1（pituitary tumor transforming gene 1, PTTG1）过表达促进人结肠癌细胞SW480侵袭和迁移作用及其可能机制。方法 采用脂质体转染法将pcDNA3.1(+)-PTTG1及空载pcDNA3.1(+)转染人结肠癌SW480细胞,G418法筛选阳性克隆。Western blot和Real-time PCR法鉴定稳定过表达PTTG1细胞株建立。Transwell小室法检测细胞侵袭和迁移能力,Western blot检测MMP2、MMP9、E-cadherin、Vimentin和Snail的表达。结果 （1）成功获得稳定高表达PTTG1的SW480克隆细胞株PTTG1-SW480;（2）过表达PTTG1基因后,SW480细胞侵袭和迁移能力增强,MMP2和MMP9表达升高,上皮间质转化（epithelial-mesenchymal transition, EMT）标记分子E-cadherin表达降低,Vimentin和Snail的表达升高,差异均有统计学意义（P<0.01）;（3）过表达PTTG1基因后,SW480细胞中PI3K/AKT信号活化增强,使用LY29400干预后,抑制细胞侵袭、迁移和EMT,E-cadherin表达上调、Vimentin和Snail的表达下调,差异均有统计学意义（P<0.01）。结论 PTTG1基因过表达可能通过活化PI3K/AKT信号诱导SW480细胞EMT发生,发挥促进SW480侵袭和迁移作用;提示PTTG1蛋白可能成为结肠癌治疗的一个潜在靶点。     

人突变p27基因对大肠癌细胞SW480生长的影响

目的：观察人突变p27基因（p27mt）对人大肠癌细胞生长的影响，探讨p27mt基因在大肠癌基因治疗中的作用机制。方法：以携带突变p27基因复制缺陷型腺病毒（Ad—p27mt）为载体，转染大肠癌细胞SW480；用Western blot方法检测p27mt蛋白的表达；细胞计数法检测p27mt对SW480细胞生长的抑制作用；用流式细胞仪检测细胞周期：用DNA片段分析法检测细胞凋亡。结果：通过免疫印迹分析Ad—p27mt转染SW480细胞后，p27在细胞中出现了蛋白高表达。PI染色流式细胞仪检测77．96％的细胞阻滞于G0/G1期，而Ad—LacZ组及空白对照组分别为27．57％和25．29％；生长曲线显示Ad—p27mt对细胞生长就有明显的抑制作用；DNA片段分析示p27mt基因可诱导细胞的凋亡。结论：p27mt对细胞周期有明显的阻滞作用，主要阻滞于G0／G1期；p27mt基因对细胞的生长抑制机制与诱导细胞凋亡和细胞周期的阻滞有关。     

化疗药物对人结肠癌细胞功能性FasLmRNA表达的影响

目的在体外通过细胞培养,初步研究5-氟尿嘧啶和奥沙利铂对人结肠癌细胞FasLmRNA表达及其诱导淋巴细胞凋亡的影响,为合理应用化疗药物,全面评价其对机体的影响提供新的思路。方法应用逆转录-聚合酶链反应(RT-PCR)法检测5-氟尿嘧啶和奥沙利铂作用前后人结肠癌SW480细胞FasLmRNA的变化;应用流式细胞术检测5-氟尿嘧啶和奥沙利铂作用前后SW480细胞诱导淋巴细胞凋亡率的变化。结果RT-PCR法检测结果显示,5-氟尿嘧啶和奥沙利铂处理后较处理前SW480细胞FasLmRNA表达水平均明显高于对照组(P<0.01);而且FasLmRNA表达水平随5-氟尿嘧啶、奥沙利铂作用浓度增加显著上调,5-氟尿嘧啶、奥沙利铂不同浓度组比较均有显著性差异(P<0.01);流式细胞术检测结果表明,随5-氟尿嘧啶和奥沙利铂作用浓度升高,SW480细胞诱导淋巴细胞凋亡率明显升高,不同浓度组比较均有显著性差异(P<0.01)。结论5-氟尿嘧啶、奥沙利铂在一定时间内均可上调人结肠癌SW480细胞FasLmRNA的表达,而且这种上调作用具有功能性,能协助肿瘤细胞反向攻击淋巴细胞。     

miRNA-125a靶向调控SMURF1对结肠癌生物学行为的影响

 目的 探讨miRNA-125a通过对靶基因SMURF1的调控在结肠癌中的影响。方法 qRT-PCR检测结肠癌患者血清中miRNA-125a和SMURF1表达水平并分析其与结肠癌相关临床指标的相关性；microRNA靶基因数据库预测miRNA-125a靶基因SMURF1并使用荧光素酶报告基因法验证其结合；qRTPCR和Western blot检测miRNA-125a模拟物对SMURF1 mRNA及蛋白表达的影响；HE染色检测结肠癌组织中SMURF1的表达；CCK-8法、细胞划痕实验及流式细胞法检测miRNA-125a模拟物和SMURF1对SW480细胞增殖、迁移及周期的影响；构建结肠癌肿瘤异种移植小鼠模型，采用称重及PCNA染色检测miRNA-125a模拟物对小鼠体内肿瘤生长的影响。结果 结肠癌患者血清中miRNA-125a表达水平与结肠癌相关临床指标呈负相关性，SMURF1表达水平与结肠癌相关临床指标呈正相关性。结肠癌组织中miRNA-125a的表达水平显著降低，miRNA-125a模拟物可抑制SMURF1的mRNA翻译及蛋白水平。结肠癌肿瘤组织中SMURF1表达水平明显升高，miRNA-125a模拟物可以抑制SW480细胞的增殖、迁移和S期细胞周期的聚集，然而这种抑制效果会因SMURF1表达升高而减弱。miRNA-125a模拟物抑制小鼠体内结肠癌生长及SMURF1的表达。结论 miRNA-125a通过下调SMURF1的表达在结肠癌的发展过程中发挥抑制作用，具有成为结肠癌诊断及治疗靶点的潜力。     

Transforming growth factor alpha and beta expression in human colon cancer lines: implications for an autocrine model

Three human colon cancer lines (SW480, SW620, WIDR) secrete different levels of transforming growth factor beta (TGF beta)-like and transforming growth factor alpha (TGF alpha)/epidermal growth factor (EGF)-like molecules into serum-free conditioned media as measured by competing activity in TGF beta and EGF radioreceptor assays. SW480 cells, the highest producers of TGF beta-like activity, lack detectable TGF beta receptors while SW620 cells, the highest producers of TGF alpha/EGF-like activity, lack EGF receptors. This study investigated the production of these growth factors at the mRNA level and examined the mechanism of loss of detectable receptors. Using complementary DNA probes for TGF beta and TGF alpha, it was demonstrated that mRNA levels correlated with the amounts of TGF beta and TGF alpha produced; TGF beta gene expression was highest in SW480 cells and TGF alpha gene expression was highest in SW620 cells. Acid washing of the SW480 cells prior to performing the TGF beta binding assay resulted in the unmasking of substantial levels of TGF beta receptors. Neither acid washing nor preincubation with suramin uncovered EGF receptors in SW620 cells. Also, and in contrast to the other two lines, EGF receptor expression could not be detected in SW620 cells by Northern gel analysis of receptor messenger RNA or by immunological analysis of receptor protein. Thus two distinct mechanisms (occupation of TGF beta receptor in SW480 cells, or absence of EGF receptor in SW620 cells) explain the lack of detectable TGF beta and EGF receptors in the binding assays. The autocrine hypothesis remains viable for TGF beta in SW480 cells but not for TGF alpha in SW620 cells; this would not discount a paracrine role in this latter case.     

USP7在结直肠癌组织中的表达及其通过调控Wnt/PCP通路对细胞增殖、凋亡的影响

目的:探讨泛素特异性蛋白酶7（ubiquitin specific protease 7,USP7）在结直肠癌组织中的表达及其通过调控Wnt/PCP通路对结直肠癌细胞SW480增殖、凋亡的影响和机制研究。方法:免疫组织化学法检测USP7在结直肠癌组织中的表达;qRT-PCR和Western blotting检测USP7在结直肠癌组织和结直肠癌细胞系中的表达;qRT-PCR和Western blotting检测沉默USP7在SW480细胞中的表达;细胞克隆形成实验检测SW480细胞增殖能力;Transwell迁移实验检测SW480细胞迁移能力;流式细胞术检测SW480细胞的凋亡情况;Western blotting检测Wnt/PCP通路相关蛋白的表达。结果:USP7在结直肠癌组织和结直肠癌细胞系中高表达（P＜0.05）;沉默USP7使SW480细胞中USP7的表达降低（P＜0.001）,细胞的增殖和迁移能力下降（P＜0.001）,细胞凋亡率增加（P＜0.001）;与shNC组相比,沉默USP7使Wnt7a蛋白和RhoA蛋白的表达水平显著下调（P＜0.001,P＜0.001）,JNK蛋白磷酸化程度显著降低（P＜0.01）。结论:USP7在结直肠癌组织和结直肠癌细胞系中高表达。沉默USP7抑制SW480细胞增殖、迁移并诱导细胞凋亡,可能与Wnt/PCP通路有关。     

CCL20 通过AKT/MMP3 轴而非EMT途径诱导结肠癌SW480 细胞的侵袭和转移

[摘要] 目的：探讨趋化因子CCL20/CCR6促进结肠癌SW480细胞侵袭和迁移的分子机制。方法：筛选高表达CCR6 的结肠癌SW480细胞,加入外源性重组人CCL20后,采用Transwell、划痕愈合实验检测其侵袭和迁移能力,以免疫荧光、WB实验检测SW480细胞EMT标志蛋白、AKT信号蛋白以及靶标蛋白MMP3 的表达;通过MK2206 阻断实验验证AKT信号是其作用机制,通过TCGA数据库资源（https://portal.gdc.cancer.gov/）分析CCL20和MMP3在结直肠癌组织中的表达水平及其相关性。结果：趋化因子CCL20能够明显促进结肠癌SW480细胞侵袭和迁移（均P<0.01）,其间并不伴随细胞的EMT变化,而是通过AKT信号的激活及下游靶标蛋白MMP3 表达上调是其诱因之一;阻断AKT信号能够明显抑制SW480细胞侵袭和迁移能力,且下调MMP3 的表达水平（P<0.05 或P<0.01）。TCGA 平台数据提示,结肠癌组织中CCL20 和MMP3 的表达明显高于正常肠黏膜组织,且两者呈明显正相关（r=0.051,P<0.01）。结论：趋化因子CCL20 通过AKT/MMP3 信号轴而非EMT机制促进结肠癌SW480 细胞的侵袭和迁移。     

YAP蛋白在结肠癌中的表达及其对SW480细胞增殖和侵袭的影响

目的:研究YAP蛋白在结肠癌中的表达及临床意义, 并初步探讨其对结肠癌细胞增殖、侵袭的影响。方法:免疫组化检测YAP蛋白在25例结肠癌组织及配对正常组织中的表达,并分析其与结肠癌临床病理特征之间的关系;用Real-Time PCR和 Western blot验证YAP-shRNA慢病毒载体转染效率;生长曲线实验和MTT法检测下调YAP表达对结肠癌细胞SW480增殖的影响;Transwell实验检测下调YAP表达对结肠癌细胞SW480侵袭的影响;Western blot检测下调YAP表达对CyclinD1、E-cadherin及Vimentin蛋白的影响。结果:YAP在结肠癌组织中的表达显著高于正常结肠组织（P＜0.05）,并且与淋巴结转移密切相关(P＜0.05);转染YAP-shRNA慢病毒载体的SW480细胞YAP的表达在mRNA 和蛋白水平明显降低（均P＜0.05）;下调YAP表达后结肠癌细胞增殖及侵袭明显减弱（均P＜0.05）;下调YAP 表达可抑制结肠癌细胞CyclinD1、E-cadherin及Vimentin蛋白的表达（均P＜0.05）。结论:YAP在结肠癌组织中高表达,且与淋巴结转移相关,下调YAP表达可抑制结肠癌细胞增殖及侵袭能力,预示YAP在结肠癌恶性进展中具有重要的作用。