AXL is an oncotarget in human colorectal cancer

AXL is a tyrosine kinase receptor activated by GAS6 and regulates cancer cell proliferation migration and angiogenesis. We studied AXL as new therapeutic target in colorectal cancer (CRC). Expression and activation of AXL and GAS6 were evaluated in a panel of human CRC cell lines. AXL gene silencing or pharmacologic inhibition with foretinib suppressed proliferation, migration and survival in CRC cells. In an orthotopic colon model of human HCT116 CRC cells overexpressing AXL, foretinib treatment caused significant inhibition of tumour growth and peritoneal metastatic spreading. AXL and GAS6 overexpression by immunohistochemistry (IHC) were found in 76,7% and 73.5%, respectively, of 223 human CRC specimens, correlating with less differentiated histological grading. GAS6 overexpression was associated with nodes involvement and tumour stage. AXL gene was found amplified by Fluorescence in situ hybridization (FISH) in 8/146 cases (5,4%) of CRC samples.Taken together, AXL inhibition could represent a novel therapeutic approach in CRC.     

结直肠癌组织中NEK2的表达及其对HCT116细胞增殖、侵袭和迁移能力的影响

目的 探讨中心体相关激酶2(NEK2)在结直肠癌组织中的表达及对结直肠癌细胞HCT116增殖、侵袭及迁移的影响.方法 构建针对NEK2的小干扰RNA(si-NEK2),脂质体法转染HCT116细胞.CCK8实验、流式细胞术、划痕实验和Transwell小室实验检测敲低NEK2表达后细胞增殖、周期分布、侵袭和迁移能力的改...     

TYMS-TM4SF4 axis promotes the progression of colorectal cancer by EMT and upregulating stem cell marker

Background: The expression of thymidylate synthase (TYMS) is significantly up-regulated in various cancers and associated with the poor prognosis of patients. However, the role of TYMS in the progression of colorectal cancer (CRC) is unclear. Methods: Cell function assay, biology information analysis, and RNA sequencing were used to investigate the role of TYMS in the progression of CRC and underlining molecular mechanism. SPSS22.0 statistical software and GraphPad Prism 5 (Graphpad software) were used for statistical analysis. Results: Our results showed that TYMS expression was higher in CRC tissues than that in non-tumor colorectal mucosa tissues. TYMS knockdown inhibited the proliferation, migration and invasion of HCT116 and HT29 cells, and the spheroid formation of HCT116 cells. The underling mechanism demonstrated that TYMS promoted the progression of CRC by regulating EMT-related proteins including E-cadherin, Vimentin, MMP-9 and stem cell biomarkers including CD133 and CD44. Furthermore, DEG sequencing showed that TYMS knockdown enriched the pathways of metastasis and metabolism by GO and KEGG analysis. We identified TM4SF4 was the downstream target of TYMS in CRC cells. TM4SF4 overexpression increased migration and invasion of CRC cells by regulating EMT and CD133 expression. Conclusions: Our findings suggest that TYMS-TM4SF4 axis may promote the progression of CRC by EMT and upregulating stem cell markers.     

RasGRF2 promotes migration and invasion of colorectal cancer cells by modulating expression of MMP9 through Src/Akt/NF-κB pathway

Ras-specific guanine nucleotide-releasing factor 2 (RasGRF2) is a member of the guanine nucleotide exchange factors family which is expressed in a variety of tissues and cancer. However, the role of RasGRF2 in cancer is less reported, especially in colorectal cancer(CRC). Hence, the present study aimed to investigated the function of RasGRF2 and ways in which it affects tumor progression in CRC samples and cell lines. We first measured RasGRF2 mRNA level in 26 paired tumor and nontumor colon tissues after colon cancer surgical resection, and determined RasGRF2 protein level in 97 paired paraffin-embedded colon cancer tissues, and found that levels of RasGRF2 mRNA and protein were increased in colorectal tumor tissues, compared with adjacent non-tumor tissues. We then examined the effects of RasGRF2 knockdown on proliferation, migration and invasion were analyzed in CRC cells (SW480, HCT116 and LS174T). HCT116 cells with RasGRF2 knockdown were injected into the tail vein in nude mice to yield metastatic model, and tumor metastasis was measured as well. We found that knockdown of RasGRF2 in CRC cells reduced their migration and invasion in vitro and metastasis in mice. Furthermore, we explored the underlying molecular mechanism for RasGRF2-mediated CRC migration and invasion. The results showed that knockdown of RasGRF2 in CRC cells impairing the expression of MMP9 and inhibiting the activation of Src/Akt and NF-κB signaling. We conclude that RasGRF2 plays a role in controlling migration and invasion of CRC and modulates the expression of MMP9 through Src/PI 3-kinase and the NF-κB pathways.     

DNAJB6b通过激活AKT通路增强结直肠癌细胞的侵袭迁移能力

目的: 探讨DnaJ热休克家族成员B6异构体b(DNAJB6b)过表达对结直肠癌细胞侵袭迁移能力的影响及相关分子机制。方法: 使用GEO数据库中的数据统计并分析结直肠癌组织中DNAJB6a和DNAJB6b mRNA表达水平的改变;体外培养结直肠癌细胞系DLD-1和HCT116,分别使用小干扰RNA(siRNA)和短发卡RNA(shRNA)敲降DNAJB6b的表达,以转染阴性对照siRNA和shRNA的细胞作为对照,使用Western blot检测敲降组与对照组细胞中相关蛋白表达水平的变化;使用PI3K/mTOR双重抑制剂BEZ235处理DLD-1和HCT116细胞,以溶剂处理细胞作为对照,进行Transwell侵袭和迁移实验,统计穿膜细胞数目;在稳定敲降DNAJB6b的DLD-1和HCT116细胞中,瞬时转染组成型活化的AKT(myr-AKT)表达载体,进行挽救实验,以转染相应空载体的细胞作为对照,使用Western blot检测相关蛋白的表达水平,同时进行Transwell实验评估细胞侵袭迁移能力的变化。结果: 与癌旁正常组织相比,结直肠癌组织中DNAJB6b mRNA的表达水平显著上调(P<0.05),而DNAJB6a mRNA的表达水平无显著变化。与对照组相比,在结直肠癌细胞系DLD-1和HCT116中敲降DNAJB6b的表达,可明显降低p-AKT(Ser473)的蛋白水平;BEZ235处理组细胞穿膜数目显著减少,仅为对照组的20%左右(P<0.01)。挽救实验结果显示,在稳定敲降DNAJB6b的DLD-1和HCT116细胞中过表达外源myr-AKT,与对照组相比,p-AKT(Ser473)表达水平升高并可显著逆转由于敲降DNAJB6b表达导致的细胞穿膜数目降低(P<0.01)。结论: DNAJB6b在结直肠癌组织中表达上调,其过表达可通过激活AKT通路增强结直肠癌细胞的侵袭迁移能力,提示其异常表达在结直肠癌发生进展过程中发挥促癌作用。     

Downregulation of GRHL2 inhibits the proliferation of colorectal cancer cells by targeting ZEB1

Previous reports have associated GRHL2 with tumor progression. However, the biological role of GRHL2 in human colorectal cancer (CRC) has not been explored. We examined the expression of GRHL2 in 75 CRC samples, as well as the paired non-tumor tissues, by immunohistochemistry, qRT-PCR, and western blot analysis. The association between GRHL2 expression and various clinicopathological parameters including Ki-67, a marker of proliferative activity, was also evaluated. We performed lentivirus-mediated shRNA transfection to knock down GRHL2 gene expression in HT29 and HCT116 CRC cells. Cell proliferation was examined by the CCK-8 (Cell Counting Kit-8) assay, colony formation, and cell cycle assay in vitro. Tumorigenesis in vivo was assessed using a mouse xenograft model. Moreover, we transiently silenced ZEB1 expression in GRHL2-knockdown CRC cells using specific shRNA, and then examined the effects on GRHL2 and E-cadherin expression, as well as cell proliferation. Herein, we demonstrated that enhanced GRHL2 expression was detected in CRC, and correlated with higher levels of Ki-67 staining, larger tumor size, and advanced clinical stage. Knocking down GRHL2 in HT29 and HCT116 CRC cells significantly inhibited cell proliferation by decreasing the number of cells in S phase and increasing that in the G₀/G₁ phaseof the cell cycle. This resulted in inhibition of tumorigenesis in vivo, as well as increased expression of ZEB1. Furthermore, transient ZEB1 knockdown dramatically enhanced cell proliferation and increased GRHL2 and E-cadherin expression. Collectively, our study has identified ZEB1 as a target of GRHL2 and suggested a reciprocal GRHL2-ZEB1 repressive relationship, providing a novel mechanism through which proliferation may be modulated in CRC cells.     

泛素特异性蛋白酶53在结直肠癌中的表达及其对HCT116细胞的抑制作用

目的:探讨泛素特异性蛋白酶53(ubiquitin specific peptidase 53,USP53)在结直肠癌组织中的表达水平及其过表达对人结直肠癌HCT116细胞功能的影响.方法:运用Real-time PCR及IHC方法检测结直肠癌及癌旁组织中USP53的表达情况;利用UCSC CANCER BROWSER提供的TCGA数据库,检测USP53 mRNA表达水平与临床特征及预后的关系;HCT116细胞中瞬时过表达USP53,利用CCK-8及克隆形成实验检测HCT116细胞增殖变化.结果:免疫组化结果显示,USP53在癌旁组织中的表达显著高于肿瘤组织[91.67％(44/48) vs 18.75％ (9/48),P＜0.01].癌旁组织中USP53 mRNA水平也高于癌组织[(0.85±0.32) vs (0.46 ±0.27),P＜0.05].组织中USP53 mRNA表达水平与预后有关,表达越低预后越差(P＜0.05).过表达USP53后,细胞克隆形成数目显著下降[(123 ±27.22) vs (338±55.24)个,P＜0.01];CCK-8实验结果显示,肿瘤细胞增殖受到显著抑制[(0.14±0.01) vs (0.18±0.04),P＜0.05;(0.23±0.01)vs(0.32±0.01),P＜0.01;(0.45±0.03) vs (0.80±0.05),P＜0.01;(0.83 ±0.03)vs (1.18±0.10),P＜0.01].结论:USP53在结直肠癌中表达下调与不良预后相关,USP53可抑制肿瘤细胞增殖,提示USP53可作为诊断及治疗结直肠癌的新靶标.     

SMYD2通过抑制APC2激活WNT/β-catenin通路影响结直肠癌细胞的迁移和侵袭

目的:探讨SET和MYND域包含蛋白质2（SET and MYND domaincontaining protein 2,SMYD2）调控结直肠癌（colorectal cancer,CRC）细胞迁移和侵袭的机制。方法:从徐州医科大学附属医院收集2019年08月至2020年03月的24对结直肠癌及癌旁组织,进行实时荧光定量PCR(quantitative real-time PCR,qRT-PCR)分析SMYD2的表达量。构建SMYD2和腺瘤性息肉病蛋白2（adenomatous polyposis coli 2,APC2）的小干扰RNA,使用Transwell和蛋白免疫印迹实验检测转染后结直肠癌细胞的迁移和侵袭能力。结果:癌组织中SMYD2的mRNA和蛋白表达量显著高于癌旁组织（P＜0.001,P＜0.05）,且结直肠癌细胞系SW480和HCT116中SMYD2的表达量显著高于正常结直肠细胞系FHC（P＜0.001）。在SW480和HCT116细胞中敲低SMYD2后细胞的迁移和侵袭能力减弱（P＜0.01）,同时E-cadherin的表达量升高（P＜0.001）,而N-cadherin和Vimentin的表达量降低（P＜0.01）。生物信息学分析显示,SMYD2与APC2的表达呈负相关（P＜0.001）,且APC2可以抑制WNT/β-catenin通路。在SW480和HCT116细胞中敲低SMYD2后APC2的表达量增高（P＜0.001）,而WNT/β-catenin通路中的β-catenin、c-MYC和CyclinD1表达降低（P＜0.01）。敲低APC2可以恢复SMYD2敲低引起的SW480和HCT116细胞的迁移和侵袭降低（P＜0.001）,E-cadherin升高（P＜0.001）和N-cadherin、Vimentin、β-catenin、c-MYC、CyclinD1降低（P＜0.01）。结论:在结直肠癌细胞中,SMYD2通过抑制APC2激活WNT/β-catenin通路促进结直肠癌细胞的上皮-间质转化（epithelial-mesenchymal transition,EMT）,从而影响细胞的迁移和侵袭能力。     

miR-92a 在结直肠癌中的表达及其对肿瘤血管生成的作用*

目的：探讨miR-92a 在结直肠癌中的表达及其对肿瘤血管新生功能的影响和作用机制。方法：采用qRT-PCR方法检测广东医学院附属深圳南山医院2014年6 月至2015年12月经手术切除的25例结直肠癌组织和对应癌旁组织及4 种结直肠癌细胞（HCT 116、SW620、SW480、HT29）中miR-92a 的表达;免疫组织化学法检测结直肠癌和癌旁组织中CD31阳性表达的微血管密度（microvesseldensity,MVD）,Pearson相关性分析探讨miR-92a 表达与肿瘤血管新生MVD的相关性。通过转染miR-92a-mimic、inhibitor 上调或抑制结直肠癌细胞HCT 116、SW620 中miR-92a 的表达水平,采用小管形成实验检测miR-92a 不同表达对HUVEC小管形成的影响,免疫印迹法检测对其下游潜在靶点PTEN的蛋白表达的影响。结果：结直肠癌组织miR-92a 的表达水平显著高于对应癌旁组织（P < 0.01）;4 种人结肠癌细胞系miR-92a 的表达水平均显著高于正常肠上皮组织（P < 0.05）;结直肠癌组织CD31阳性微血管密度显著高于癌旁组织（P < 0.01）,miR-92a 表达水平与结直肠癌血管新生MVD呈显著正相关（r = 0.580,P = 0.01）;上调miR-92a 表达的HCT 116 细胞培养上清液可以显著促进HUVEC小管形成（P < 0.05）;上调miR-92a 表达可以显著抑制HCT116 细胞中PTEN蛋白表达水平（P < 0.01）。 结论：miR-92a 在结直肠癌细胞和组织中高表达,与肿瘤血管新生增加密切相关;miR-92a 可能通过抑制PTEN的表达发挥促进结直肠癌血管新生的生物学功能。     

miR-145-5p靶向TAGLN2调控结直肠癌SW620细胞侵袭和迁移的机制探讨

目的:探究微小RNA-145-5p（miR-145-5p）在结直肠癌组织和细胞中的表达情况及其靶向调控肌动蛋白凝胶蛋白2（TAGLN2）对结直肠癌细胞侵袭和迁移能力的影响。方法:采用实时荧光定量PCR（qPCR）技术对48例结直肠癌患者癌组织、配对癌旁组织、结直肠癌细胞株（HCT8、SW620、HCT116、HT-29）及结直肠黏膜细胞FHC中的miR-145-5p和TAGLN2 mRNA表达进行定量分析。将SW620细胞设为空白对照组、miR-145-5p mimics组、mimics-NC组、pcDNA3.1-TAGLN2组、pcDNA3.1-Vector组和miR-145-5p mimics+pcDNA3.1-TAGLN2组,采用qPCR检测miR-145-5p和TAGLN2 mRNA表达,采用Transwell法检测细胞侵袭及迁移能力,采用免疫印迹法（Western blot）检测TAGLN2蛋白及EMT相关蛋白表达,采用双荧光素酶报告实验检测miR-145-5p和TAGLN2间的靶向关系。结果:miR-145-5p在结直肠癌组织中的表达水平显著低于癌旁组织（P<0.05）,并与结直肠癌患者的TNM分期和淋巴结转移相关（均P<0.05）;TAGLN2在结直肠癌组织中的表达水平显著高于癌旁组织,并与miR-145-5p表达呈负相关（P<0.05）;miR-145-5p和TAGLN2在结直肠癌HCT8、SW620、HCT116和HT-29细胞中的表达水平显著低于或高于FHC细胞（均P<0.05）。miR-145-5p过表达可降低SW620细胞的侵袭和迁移能力。miR-145-5p靶向调控TAGLN2表达,单独转染TAGLN2阳性质粒可增加SW620细胞的侵袭和迁移能力,与miR-145-5p mimics同时转染后,TAGLN2蛋白、波形蛋白（Vimentin）和神经钙黏素（N-cadherin）表达降低,上皮钙黏素（E-cadherin）表达升高,TAGLN2对SW620细胞侵袭和迁移能力的增强作用被显著抑制。结论:miR-145-5p在结直肠癌中呈低表达状态,其表达水平与结直肠癌患者的TNM分期和淋巴结转移密切相关,miR-145-5p靶向调控TAGLN2抑制结直肠癌细胞的侵袭和迁移能力。     

TMPRSS4 correlates with colorectal cancer pathological stage and regulates cell proliferation and self-renewal ability

Transmembrane protease/serine 4 (TMPRSS4) is a member of the type II transmembrane serine protease (TTSP) family and it was found highly expressed in several cancers. This study aims to evaluate the expression of TMPRSS4 in colorectal cancer (CRC) and investigate its role in proliferation and self-renewal of colon cancer cells. qRT-PCR and immunohistochemistry were used to detect the mRNA and protein expression level of TMRPSS4 in CRC samples respectively. Loss of function assay was conducted with RNAi technique. Cell proliferation was done with WST-8 assay; cell apoptosis and cell cycle analysis were performed with flow cytometry; invasion and migration were done with transwell assay. Plate and soft agarose clonogenic assays were used to detect clone-formation ability. CD44 and CD133 expressions were analyzed by flow cytometry and western blot. We found that TMPRSS4 was highly expressed in CRC tissues both at mRNA and protein level and correlated with pathological stage. Knockdown of TMPRSS4 in highly expressed colon cancer cell line HCT116 resulted in inhibition of cell proliferation, induction of cell apoptosis and suppression of invasion and migration; moreover, knockdown of TMPRSS4 suppressed the in vitro clone-formation ability of HCT116 and reduced the expressions of CD44 and CD133. The findings in this research showed that TMPRSS4 was associated with CRC stage and regulated the proliferation and self-renewal ability of colon cancer cells; TMRPSS4 was involved in the development and progression of CRC.     

MiR-1297 Regulates the Growth,Migration and Invasion of Colorectal Cancer Cells by Targeting Cyclo-oxygenase-2

Cyclo-oxygenase-2(Cox-2), a key regulator of inflammation-producing prostaglandins, promotes cellproliferation and growth. Therefore, a better understanding of the regulatory mechanisms of Cox-2 could leadto novel targeted cancer therapies. MicroRNAs are strongly implicated in colorectal cancer but their specificroles and functions have yet to be fully elucidated. MiR-1297 plays an important role in lung adenocarcinomaand laryngeal squamous cell carcinoma, but its significance in colorectal cancer (CRC) has yet to be reported.In our present study, we found miR-1297 to be down regulated in both CRC-derived cell lines and clinical CRCsamples, when compared with normal tissues. Furthermore, miR-1297 could inhibit human colorectal cancerLOVO and HCT116 cell proliferation, migration, and invasion in vitro and tumorigenesis in vivo by targetingCox-2. Moreover, miR-1297 directly binds to the 3`-UTR of Cox-2, and the expression level was drasticallydecreased in LOVO and HCT116 cells following overexpression of miR-1297. Additionally, Cox-2 expressionlevels are inversely correlated with miR-1297 expression in human colorectal cancer xenograft tissues. Theseresults imply that miR-1297 has the potential to provide a new approach to colorectal cancer therapy by directlyinhibiting Cox-2 expression.     

LINC00178 promotes cell growth,migration, and invasion in colorectal cancer in vitro and in vivo

BackgroundThis study aimed to determine the role of LINC00178 in colorectal cancer (CRC) cell invasion and migration by examining its expression in CRC cells and tissues.MethodsCancer tissues and corresponding adjacent tissue specimens were collected from 45 patients who experienced radical CRC resection in the hospital from March to September 2021. The expression of LINC00178 was measured in both CRC cells and tissues and normal human colorectal mucosal cells using quantitative fluorescence polymerase chain reaction (QF-PCR). Cell Counting Kit-8 (CCK-8), clonogenic, and transwell assays were used to assess the impact of LINC00178 overexpression or knockdown on the CRC cells invasion and proliferation. In addition, the expression levels of vimentin, E-cadherin, and N-cadherin in CRC cells were determined after either LINC00178 knockdown or overexpression was performed using western blotting.ResultsThe experiments revealed that LINC00178 was over expressed in CRC cells and tissues. Over-expression of LINC00178 could significantly promote the propagation, clone formation, invasion, and transportation of CRC, whereas knockdown of LINC00178 had the opposite function. When LINC00178 was expressed at high levels, it suppressed the vimentin and N-cadherin expression and prevented the upregulation of E-cadherin. In vivo (nude mouse) studies showed that the over expression of LINC00178 could significantly promote the propagation in CRC cells.ConclusionsLINC00178 is overexpressed in CRC cells and tissues. In vivo and in vitro experiments showed that LINC00178 can significantly promote the propagation of CRC cells, so it may develop a potential biological site for targeted therapy of CRC patients.     

lncRNA CASC2对结直肠癌细胞功能及血管生成的影响

目的 研究lncRNA CASC2过表达对结直肠癌细胞增殖、迁移、血管生成及Wnt/FZD/β-catenin信号通路的影响.方法 qRT-PCR检测lncRNA CASC2在正常结肠上皮细胞(NCM460)及结直肠癌细胞株(DLD-1、HT29、SW620、HCT116、RKO、LOVO、SW480)中的表达情况;H...     

Atractylenolide I inhibited the development of malignant colorectal cancer cells and enhanced oxaliplatin sensitivity through the PDK1-FoxO1 axis

BackgroundColorectal cancer (CRC) is a type of ordinary malignancy of the gastrointestinal tract. Atractylenolide I (AT-I) has been shown to inhibit the process of CRC. However, the specific mechanism by which AT-I inhibits CRC is not yet well understood.MethodsCell Counting Kit-8 and colony formation assays were conducted to examine cell proliferation. The cell apoptosis was detected by terminal deoxynucleotidyl-transferase-mediated dUTP nick end labeling (TUNEL). Cell invasion and migration were evaluated by wound-healing and Transwell assay. The angiogenesis capabilities of the cells were examined by tube formation experiments. Western blot was conducted to examine the apoptosis and angiogenesis-associated proteins, pyruvate dehydrogenase kinase 1 (PDK1), and Forkhead box protein O1 (FoxO1) expression.ResultsWe found that AT-I inhibited the proliferative, migratory and invasive abilities of Human colorectal cancer cell line HCT116 cells but stimulated cell death by promoting cell apoptosis via the PDK1/FoxO1 axis. In addition, the upregulation of PDK1 decreased the inhibitory effect of AT-I on HCT116 angiogenesis, and AT-I increased oxaliplatin sensitivity via the PDK1/FoxO1 axis.ConclusionsCollectively, AT-I inhibited the malignant development of CRC cells and increased oxaliplatin sensitivity by decreasing PDK1 and inhibiting FoxO1 phosphorylation. Thus, AT-I has protective potential and could be a promising agent for CRC treatment.     

MicroRNA-95 promotes cell proliferation and targets sorting Nexin 1 in human colorectal carcinoma

MicroRNAs (miRNAs) are strongly implicated in cancer but their specific roles and functions in the major cancers have yet to be fully elucidated. In this study, we defined the oncogenic significance and function of miR-95, which we found to be elevated in colorectal cancer (CRC) tissues by microarray analysis. Evaluation of an expanded CRC cohort revealed that miR-95 expression was up-regulated in nearly half of the tumors examined (42/87) compared with the corresponding noncancerous tissues. Ectopic overexpression of miR-95 in human CRC cell lines promoted cell growth in vitro and tumorigenicity in vivo, whereas RNAi-mediated silencing of miR-95 decreased cell growth ratio. Mechanistic studies revealed that miR-95 repressed the expression of reporter gene coupled to the 3'-untranslated region of sorting nexin 1 (SNX1), whereas miR-95 silencing up-regulated SNX1 expression. Moreover, miR-95 expression levels correlated inversely with SNX1 protein levels in human CRC tissues. RNAi-mediated knockdown of SNX1 phenocopied the proliferation-promoting effect of miR-95, whereas overexpression of SNX1 blocked miR-95-induced proliferation of CRC cells. Taken together, these results demonstrated that miR-95 increases proliferation by directly targeting SNX1, defining miR-95 as a new oncogenic miRNA in CRC.     

ALMS 1-IT1在结直肠癌中的表达及其对癌细胞增殖、侵袭和上皮间质转化的影响

目的:探讨lncRNA ALMS1-IT1在结直肠癌(colorectal cancer,CRC)中的表达及预后意义,明确ALMS1-IT1对CRC细胞增殖、侵袭和上皮间质转化(epithelial-mesenchymal transition,EMT)的影响.方法:通过GEPIA网络平台分析癌症基因图谱(The Ca...     

ZIC1过表达对结直肠癌HCT-116细胞增殖及对苦参碱类生物碱药物敏感性的影响

目的:检测ZIC1基因在结直肠癌细胞内过表达后对癌细胞增殖能力的影响,以及对苦参碱类生物碱药物敏感性的改变情况。方法:首先从五种结直肠癌细胞株中筛选出ZIC1基因表达最低的一株,对其进行慢病毒转染,使其稳定表达ZIC1基因或空载体,再利用Western blot技术和qRT-PCR技术鉴定ZIC1蛋白/mRNA表达情况。通过CCK-8法和平板克隆形成实验检测过表达ZIC1基因后细胞增殖能力的改变,并利用CCK-8法分析稳转细胞株对苦参碱类生物碱药物敏感性的改变。结果:HCT116细胞株中ZIC1 mRNA/蛋白表达均显著低于其他四株（P<0.001）;慢病毒转染后,含rLV-ZIC1-PGK-Puro的重组慢病毒转染HCT116细胞内ZIC1 mRNA/蛋白表达水平显著高于对照组（P<0.001）。CCK-8实验结果示,ZIC1基因过表达后HCT116细胞增殖能力明显降低（P<0.01）;实验组克隆形成率明显低于对照组（P=0.003）。CCK-8法发现ZIC1过表达后HCT116结直肠癌细胞对苦参碱及槐定碱的药物敏感性得到明显的升高,而对氧化苦参碱及槐果碱的药物敏感性无明显改变。结论:HCT116结直肠癌细胞内ZIC1基因过表达后能有效抑制癌细胞的增殖,并增敏苦参碱及槐定碱对结直肠癌HCT116细胞的药理作用。