胃癌干细胞表面标记物的研究与最新进展

背景:最近人们研究发现,肿瘤的复发与肿瘤干细胞密切相关。肿瘤干细胞理论为研究胃癌的发病机制以及诊治开辟了新的途径,确定的表型有利于锁定胃癌干细胞,这有助于探讨胃癌干细胞在自我更新和分化过程中的作用,并为治疗胃癌提供新思路,但其表型仍存在争议。目的:综述胃癌干细胞表面标志物的研究进展。方法:由第一作者分别以"Gastric Cancer Stem Cells"为英文关键词检索PubM ed英文数据库(http://www.ncbi.nlm.nih.gov/pubmed)中1965年1月至2015年10月的文献,共保留68篇文献进行综述。结果与结论:通过分析整理,传统上的肿瘤干细胞表型不适合于标记胃癌干细胞。研究发现CD90在胃癌原发性肿瘤中有表达,分离后经无血清肿瘤球培养法培养可获得肿瘤球。CD24的表达有助于提高胃癌细胞的黏附、侵袭、迁移能力。此外研究证实CD44及CD54共表达的细胞会大量出现在胃癌复发早期患者的体内而不是晚期,表达CD44及CD54的肿瘤细胞很可能是导致胃癌发生以及复发的重要原因。综上所述,CD44^+CD24^+CD90^+CD54^+很可能是胃癌干细胞的表型。     

人原代胃癌细胞中肿瘤干细胞的分化培养

BACKGROUND:There is a close relationship between tumor stem cells and tumor occurrence and recurrence, but there are still some disputes in the presence of tumor stem cells in all tumors. OBJECTIVE:To investigate the differentiation and culture of tumor stem cells in human primary gastric cancer cells. METHODS:Primary gastric cancer cells isolated from fresh gastric cancer tissues were stained with hematoxylin-eosin and identified by immunohistochemical detection of carcinoembryonic antigen. The CD44 expression of the cells was detected using immunofluorescence method. Magnetic activated cell sorting was used to isolate CD44⁺ gastric cancer cells that were then seeded subcutaneously behind the armpit of mice. Growth of implanted tumor cells was observed. RESULTS AND CONCLUSION:Human primary gastric cancer cells were isolated in serum-free medium. Compared with the routine culture group, the number of CD44⁺ cells (P < 0.05) and the tumor volume were significantly increased in the spheroid culture group. Furthermore, at 90 days after transplantation, the tumor volume of mice in spheroid culture group was significantly higher than that in the routine culture group. These experimental findings indicate that gastric cancer cells with certain tumorigenicity can be successfully isolated from gastric cancer cells using serum-free culture method and magnetic activated cell sorting method.     

胃癌干细胞的分离、鉴定及其特性

背景：近年来随着肿瘤干细胞的深入研究,越来越多的证据表明肿瘤干细胞是恶性肿瘤转移复发的原因,因此分离鉴定出肿瘤干细胞对阐明肿瘤发病机制和研发抗肿瘤药物具有重要意义。 目的：分离培养胃癌干细胞,并检测胃癌干细胞的生物学特性。 方法：收集16例胃癌患者术中切除肿瘤组织,采用组织块贴壁培养法和酶消化培养法从肿瘤组织中分离胃癌干细胞,倒置显微镜下观察细胞形态,绘制生长曲线,并观察成骨成脂诱导分化能力。 结果与结论：两种方法均能够分离出胃癌干细胞,在显微镜下可以发现细胞形态为长梭形或多角样,细胞增殖生长达到融合时,呈漩涡状、放射状排列。从细胞生长曲线可以看出,1-3 d为潜伏期,4-9 d为对数增殖期,10 d后进入生长平台期。流式细胞仪检测结果显示：第3代胃癌干细胞高表达细胞表面标志物CD90、CD29、CD44,而低表达CD34、CD45、HLA-DR。第3代胃癌干细胞经成骨诱导后可见钙化结节,成脂诱导后细胞胞浆开始出现微小明亮的脂肪滴。结果表明胃肿瘤组织内存在肿瘤干细胞,且与正常细胞有相似的形态、生物特性以及多向分化能力,可能参与胃癌的发生、发展。 中国组织工程研究杂志出版内容重点：干细胞;骨髓干细胞;造血干细胞;脂肪干细胞;肿瘤干细胞;胚胎干细胞;脐带脐血干细胞;干细胞诱导;干细胞分化;组织工程     

EB病毒相关胃癌研究进展

世界范围内约10％的胃癌组织中可检测到EBV，研究显示：EBV感染能使原代培养的正常胃上皮细胞永生化，EBV相关胃癌是由一个EBV感染的细胞单克隆增殖形成，提示EBV感染在EBV相关胃癌的发展中起重要作用。本文就EBV相关胃癌的诊断、病毒存在形式和基因表达、影响其发生发展的协同因素以及EBV对上皮细胞的生长促进作用作一综述。     

上皮间质转化在胃癌SGC7901细胞向胃癌干细胞转化过程中的作用

BACKGROUND: Studies have found that epithelial-mesenchymal transition is closely related with tumor invasion, metastasis, and drug resistance, but studies on the role of epithelial-mesenchymal transition in the transformation process of gastric cancer cells SGC7901 to gastric cancer stem-like cells are rarely reported. OBJECTIVE: To explore the effect of epithelial-mesenchymal transition in the transformation process of gastric cancer cells SGC7901 to gastric cancer stem-like cells. METHODS: Vincristine-induced SGC7901 cells were cultured and screened to prepare gastric cancer stem-like cells. CD44 phenotype, morphological changes, stem cell-related markers, and epithelial-mesenchymal transition related molecules were detected. RESULTS AND CONCLUSION: After passage, vincristine-induced SGC7901 cells presented with morphological changes, and clonal cell spheres generated after serum-free suspension culture. Meanwhile, the proportion of SGC7901 cells positive for CD44 was decreased. Expression levels of SOX2, OCT4, Snail1 mRNA, Twist mRNA and Vimentin mRNA were significantly higher in the gastric cancer stem-like cells than SGC7901 cells, but the expression level of E-caderin was lower in the gastric cancer stem-like cells than SGC7901 cells. These findings indicate that gastric cancer cells SGC7901 can be successfully transformed into gastric cancer stem-like cells, and the epithelial-mesenchymal transition is involved in this transforming progress.       

肿瘤干细胞表面标记物CD44在胃癌组织中的表达及意义

BACKGROUND:Studies have shown that CD44 expression is closely associated with malignant transformation of gastric cancer. OBJECTIVE:To study the expression of CD44 in gastric cancer tissues and its clinical significance. METHODS:Gastric cancer specimens from 94 cases of gastric cancer after surgery and normal gastric tissue specimens from 30 cases undergoing gastroscope examination were collected and detected using S-P method. The positive expression rate of CD44 protein in these two groups was compared, and the relationship between CD44 and prognosis was analyzed. RESULTS AND CONCLUSION:The positive expression rate of CD44 protein in the gastric cancer group (73%) was significantly higher than that in the normal group (3%) (P < 0.05). The positive expression rate of CD44 protein in gastric cancer patients was remarkably associated with TNM stage, differentiation degree, invasion depth and lymph node metastasis (P < 0.05). The 3-year survival rate of gastric cancer patients positive for CD44 protein was significantly lower than that of negative patients (P < 0.05). The higher TNM staging indicated the lower differentiation degree, and lymph node metastasis and CD44 positive expression were independent risk factors (P < 0.05). To conclude, the expression of CD44 protein is related to the clinical pathological features and prognosis of gastric cancer patients to some extents.     

胃癌干细胞抗原负载树突细胞与细胞因子诱导的杀伤细胞

BACKGROUND:As the existence of tumor stem cells, it is difficult to completely eliminate tumors in clinic. OBJECTIVE:To explore the tumor-killing effect of gastric cancer stem cells as antigen to stimulate dendritic cells combined with cytokine-induced killer cells. METHODS:Side population cells from human gastric cancer cell lines were isolated, and tumor antigen was prepared by freeze thawing method. After coculture with dendritic cells, dendritic cells combined with cytokine-induced killer cells, gastric cancer cell antigen, and gastric cancer stem cell antigen, killing rates of gastric cancer cells were detected using MTT assay. Expression rate of CD83, a mature dendritic cell surface marker, was also detected. RESULTS AND CONCLUSION:The CD83 expression level and killing rate of gastric cancer cells were both significantly lower in the gastric cancer stem cell antigen group than the other groups (both P < 0.05). These results indicate that gastric cancer stem cells as antigen to stimulate dendritic cells combined with cytokine-induced killer cells can promote the proliferation of gastric cancer cells and elevate the ability to killing gastric cancer cells.     

信号通路对胃癌干细胞及胃癌发生的影响

背景：Hedgehog与Wnt/β-catenin信号通路对胃癌干细胞的影响及在胃癌发生发展中的作用机制少见报道。 目的：探讨Hedgehog与Wnt/β-catenin信号通路在胃癌发生发展中的作用机制。 方法：采用肿瘤球悬浮分选法从胃癌组织标本中分选胃癌干细胞。采用免疫组化SP法检测Hedgehog 及Wnt/β-catenin信号通路主要分子SHH、GLI1、Wnt2 及β-catenin在胃癌干细胞中的表达。Spearman相关分析各细胞因子间的相关性分析。 结果与结论：SHH、GLI1、Wnt2及β-catenin 在胃癌干细胞中的阳性表达率分别为74.7%,78.3%,85.5%和83.3%,均显著高于癌旁组织的阳性表达率(P < 0.05)。各细胞因子间在胃癌干细胞中的表达均呈正相关(P < 0.05)。说明在胃癌干细胞中Hedgehog及Wnt/β-catenin信号通路均被激活,二者互相作用可能参与了胃癌的发生发展,为胃癌的干细胞治疗提供了新的研究方向。     

胃癌不同分化程度与PTEN表达缺失的相关性

目的：探讨磷酸酶基因（PTEN）表达缺失情况与胃癌分化程度的关系。方法：通过检测52例经病理证实为胃癌的手术标本或胃镜检查活检标本中PTEN的表达情况,并与浅表性胃炎和正常无病变的胃黏膜活检标本（各20例）比较。结果：浅表性胃炎组、正常胃黏膜组所有标本中PTEN均有高度阳性（＋＋＋）表达,两组无明显差异（P〉0.05）;低分化胃癌组、中分化胃癌组、高分化胃癌组与浅表性胃炎组或正常胃黏膜组比较,随着胃癌分化程度的降低,PTEN的表达逐渐减弱,组间差异经统计学分析有显著性意义（P〈0.05）。结论：PTEN的表达情况与胃癌的分化程度密切相关,胃癌组织学分化越差,PTEN的表达缺失越明显。     

顺铂在大鼠体内富集胃癌干细胞

背景：肿瘤干细胞具有自我更新、耐药和转移成瘤能力,对肿瘤的发生、发展以及肿瘤的转移等具有重要的功能。目前,确认肿瘤干细胞的方法主要有2种,即体外瘤球培养实验以及小鼠体内成瘤实验,但临床上通过化疗在大鼠体内富集胃癌细胞尚缺乏研究报道。 目的：观察顺铂在大鼠体内富集胃癌干细胞的情况,研究其表面标志蛋白的筛选方法。 方法：建立BGC-823胃癌模型大鼠,采用随机对照方法将大鼠分为2组,实验组大鼠分别尾静脉注射质量浓度0.1,0.2,0.25,0.3 g/L的顺铂,而对照组则尾静脉注射生理盐水。经过3期化疗,最后得到富集胃癌干细胞组织;采用高通量蛋白芯片对肿瘤表面蛋白进行提取,并采用Western blot对芯片进行验证,比较顺铂在大鼠体内富集胃癌干细胞及其表面标志蛋白的筛选方法。 结果与结论：顺铂剂量为0.3 g/L×200 μL时治疗效果最佳,且化疗药物浓度越高,耐受力越差,不良反应发生率越高。移植瘤经苏木精-伊红染色验证均为癌组织;Western blot检测结果与蛋白芯片结果显示,HLA-DQ,PMP22和Claudin7蛋白在胃癌组织中表达增强,HLA-DR,CD14,CD16和CD56蛋白表达减弱。结果证实,顺铂化疗能够在体内富集胃癌干细胞,能够成功筛选出相应的表面标志物蛋白。中国组织工程研究杂志出版内容重点：干细胞;骨髓干细胞;造血干细胞;脂肪干细胞;肿瘤干细胞;胚胎干细胞;脐带脐血干细胞;干细胞诱导;干细胞分化;组织工程     

ELMO1在胃癌细胞侵袭和迁移中的作用

目的:探讨吞噬和细胞运动蛋白1(ELMO1)的表达在胃癌细胞侵袭和迁移中的作用和功能。方法:用Western blot和实时荧光定量PCR实验检测5种胃癌细胞和1种人正常胃黏膜上皮细胞ELMO1的蛋白和mRNA表达水平,并筛选出ELMO1表达量高的胃癌细胞株;用细胞转染实验沉默胃癌细胞株的ELMO1;用细胞划痕实验以及Trenswell小室迁移和侵袭实验检测抑制该基因的表达对胃癌细胞侵袭和迁移能力的影响。结果:胃癌细胞中ELMO1的表达量明显高于人正常胃黏膜上皮细胞(P0.01),其中SGC7901细胞的ELMO1表达量最高;在SGC7901细胞中ELMO1-siRNA可显著沉默ELMO1的表达(P0.05);沉默ELMO1可显著降低胃癌细胞侵袭和转移的能力(P0.01)。结论:ELMO1在胃癌细胞中高表达,并可促进胃癌细胞的侵袭和迁移。     

ZAC基因在奥曲肽抑制胃癌细胞体外增殖通路的作用

目的 探讨ZAC基因在生长抑素类似物奥曲肽（OCT）抑制胃癌细胞增殖通路的作用。方法 分别以不同浓度OCT处理胃癌细胞BGC823和 SGC7901不同时间,MTT法筛选其增殖抑制的有效条件。OCT处理胃癌细胞（有效浓度/不同时间,有效时间/不同浓度）,Western blotting检测
OCT对胃癌细胞ZAC基因的效应。设计3条ZAC基因RNA干扰片段,分别插入pSUPER-EGFP-I载体,构建3个ZAC-shRNA表达载体（pSUPER-EGFP-ZAC/1 pSUPER-EGFP-ZAC/2和pSUPER-EGFP-ZAC/3）。经酶切和序列分析鉴定后,分别转染胃癌细胞BGC823和SGC7901。经G418筛选,RT-PCR鉴定,建立
ZAC基因敲低（knock-down）的胃癌细胞系。以有效条件OCT孵育胃癌细胞（对照组）和ZAC基因敲低胃癌细胞（实验组）,MTT法检测OCT对胃癌 细胞的生长抑制效应。结果 OCT抑制胃癌细胞增殖的有效条件为10nmol/L 孵育24h;OCT以时间和浓度依赖的方式诱导胃癌细胞ZAC基因表达。酶切及序列分析鉴定表明ZAC-shRNA表达载体构建成功。转染shRNA-ZAC/2的胃癌细胞,其ZAC mRNA水平明显降低（P<0.05）,为ZAC基因敲低胃癌 细胞。ZAC基因敲低胃癌细胞的增殖明显高于对应的BGC823细胞和SGC7901细胞（P<0.05）。OCT孵育后,BGC823细胞和SGC7901细胞的增殖明显降低（P<0.05）。然而,ZAC基因敲低胃癌细胞的增殖无明显改变（P>0.05）。结论 OCT以时间和浓度依赖的方式诱导胃癌细胞ZAC基因表达;ZAC 基因在OCT抑制胃癌细胞增殖通路中具有重要作用。     

骨髓间充质干细胞移植对胃癌模型大鼠肿瘤细胞的影响

BACKGROUND:Bone marrow mesenchymal stem cells can migrate into tumor tissues, as reported in recent studies. OBJECTIVE:To investigate the tropism and effect of transplantation of bone marrow mesenchymal stem cells on proliferation and differentiation of gastric cancer cell line SGC7901 in rats. METHODS:Gastric cancer models were established in Sprague-Dawley rats by subcutaneous injection of gastric cancer cell line SGC7901, and then, in cell transplantation group, each rat underwent an intraperitoneal injection of 1×107 bone marrow mesenchymal stem cells. After transplantation, the targeting ability of bone marrow mesenchymal stem cells was detected using fluorescent DiI labeling. Cyclin D2 mRNA and protein expressions were measured using real-time PCR and western blot assay, respectively. Apoptosis of gastric cancer cells was observed by in situ terminal labeling method. RESULTS AND METHODS: Bone marrow mesenchymal stem cells successfully migrated into the gastric cancer site in rats. The expression levels of cyclin D2 mRNA and protein in the cell transplantation group were significantly higher than those in the model group (P < 0.05). It was observed that the number of apoptotic cancer cells was significantly reduced in the cell transplantation group compared with the model group (P < 0.05). These findings indicate that bone marrow mesenchymal stem cells have the ability to migrate into the tumor sites, thereby promoting the proliferation of gastric cancer cells.     

Heparanase promotes human gastric cancer cells migration and invasion by increasing Src and p38 phosphorylation expression

Gastric cancer is one of the most common cancers and it remains difficult to cure, primarily because most cancer stem like cells possess higher capability of invasion and metastasis. Heparanase acts as a master regulator of the aggressive tumor phenotype in part by enhancing expression of proteins and activating signaling molecules. There were less associated with heparanase of molecular biology mechanism in human gastric cancer. We first evaluated the endogenous expression of heparanase in human gastric cancer cell lines and found Heparanase expression higher in SGC-7901 than MGC-803. Using the technology of RNAi in SGC-7901 cells down regulated heparanase gene, and reduced SGC-7901 cells migration and invasion. On the other hand, recombinant heparanase protein added in MGC-803 cells enhanced MGC-803 cell migration and invasion. The elevated cell migration and invasion were impaired by treatment of Src inhibitor pp2 or p38 inhibitor SB 203580. We further found that Stable knockdown of heparanase in SGC-7901 cells decreased phosphorylation of Src and p38. The phosphorylation of p38 was inhibited in response to pp2 treatment while the addition of SB 203580 to SGC-7901 cells did not change phosphorylation of Src. These data suggest that heparanase facilitates invasion and migration of human gastric cancer cells probably through elevating phosphorylation of Src and p38.     

ER-α36和miR-143介导胃癌细胞的侵袭

 目的：探讨雌激素受体α36（ER-α36）与胃癌细胞侵袭之间的关联及其作用机制。方法：用高浓度和低浓度17β-雌二醇作用人胃癌细胞SGC7901,检测细胞侵袭能力和ER-α36蛋白表达变化;构建稳定转染低表达ER-α36和高表达ER-α36的SGC7901细胞系,在检测其侵袭能力的变化同时进行microRNA测序。结果：高浓度17β-雌二醇刺激SGC7901细胞后,细胞的侵袭能力减弱,ER-α36的蛋白减少;低浓度17β-雌二醇刺激细胞后的效应相反;高表达ER-α36的SGC7901细胞的侵袭能力要明显高于低表达ER-α36和对照组的SGC7901细胞;高表达ER-α36的SGC7901细胞miR-143的表达显著下降,低表达ER-α36的SGC7901细胞miR-143的表达显著上升。结论：ER-α36的表达与胃癌的侵袭相关,此机制可能与miR-143的调控有关。     

FEN1 siRNA对胃癌细胞生物学特性的影响及机制研究

目的 探讨瓣状核酸内切酶1(FEN1)小干扰RNA(FEN1 siRNA)对胃癌细胞生物学特性的影响及机制。方法 培养胃癌细胞SGC7901,转染FEN1 siRNA和阴性对照序列(siRNA control)分别命名为干扰组和NC组,同时以不做处理的胃癌细胞SGC7901作为对照组。采用实时荧光定量PCR和Western blot检测FEN1 siRNA的转染效果,细胞划痕实验检测胃癌细胞SGC7901迁移能力,Transwell小室检测胃癌细胞的侵袭能力,Western blot检测胃癌细胞中基质金属蛋白酶-2(MMP-2)、基质金属蛋白酶-9(MMP-9)、β-连环蛋白(β-catenin)的蛋白相对表达水平。结果 干扰组细胞中FEN1 mRNA和蛋白水平明显低于对照组及NC组,差异均有统计学意义(P值均＜0.01),而NC组细胞中FEN1 mRNA和蛋白水平与对照组比较,差异均无统计学意义(P值均＞0.05)。干扰组细胞迁移能力、侵袭能力及MMP-2、MMP-9、β-catenin蛋白相对表达水平均明显低于对照组及NC组,差异均有统计学意义(P值均＜0.01);而NC组细胞迁移能力、侵袭能力及MMP-2、MMP-9、β-catenin蛋白相对表达水平与对照组比较,差异均无统计学意义(P值均＞0.05)。结论 转染FEN1 siRNA能够抑制胃癌细胞中FEN1的表达,可抑制胃癌细胞的迁移能力、侵袭能力,其作用机制可能与抑制MMP-2、MMP-9、β-catenin蛋白的表达水平有关。     

PTPN13在人胃癌组织和胃癌SGC-7901细胞系中的表达及其对细胞增殖和侵袭的影响

目的分析PTPN13在人胃癌组织中及胃癌SGC-7901细胞系中的表达及其对细胞增殖、侵袭的影响。方法收集106例胃癌患者的胃癌组织及癌周正常组织标本。常规培养SGC-7901细胞并分为pc DNA3.1-PTPN13质粒转染组和未转染组。免疫组织化学法检测组织中的PTPN13表达;分析PTPN13表达与患者性别、年龄、肿瘤部位、肿瘤大小、浸润深度及转移的关系;Kaplan-Meier曲线分析不同PTPN13表达患者生存率的差异;CCK-8法检测细胞的增殖能力;Trans-well试验分析侵袭能力;Western blot检测E-cadherin、Snail及MMP9的表达。结果胃癌组织中的PTPN13阳性率低于癌周正常胃组织(31%vs 83%,P0.05);PTPN13的表达与肿瘤直径、浸润深度、淋巴结和远隔器官转移情况有关(P0.05);PTPN13阴性的胃癌患者2生存率较低;PTPN13过表达可以降低SGC-7901细胞的增殖率(P0.05),同时降低其侵袭能力(P0.05);上调PTPN13后SGC-7901细胞上皮化标志物E-cadherin表达增加,而间质化标志物Snail和MMP9表达减少。结论 PTPN13在胃癌组织和胃癌细胞中具有肿瘤抑制作用,较低的PTPN13表达提示患者预后不良。PTPN13具有成为胃癌的治疗诊断或治疗靶点的潜力。     

RhoC is essential for the metastasis of gastric cancer

Rho family members are known to regulate malignant transformation and motility of cancer cells, but the clinicopathological significance of RhoC remains unclear yet in the case of gastric cancer. In this study, we evaluated the protein expression level of RhoC in gastric cancer tissues and cell lines. Results showed that only weak staining of RhoC was detected in 3 of 33 non-tumorous cases by immunohistochemistry. The expression of RhoC was significantly higher in gastric cancer tissues (23/42, 54.8%) than in non-tumorous tissues (p < 0.01). Further analysis demonstrated that RhoC had high specificity (80.0%) in detecting gastric carcinomas with metastatic potential. RhoC was positively expressed in 18 out of 20 metastases (90.0%), even higher than that in primary gastric cancer tissues. Western blot showed that RhoC was up-regulated in five different gastric cancer cell lines but not expressed in SV40-transformed immortal gastric epithelial cell GES-1. Overexpression of RhoC GTPase in GES-1 cells could produce the motile and invasive phenotype but did not alter the monolayer growth rate. To further study the functions of RhoC, we took the powerful siRNA technology to knock down the expression of RhoC in SGC7901 cells. It was shown that down-regulation of RhoC did not affect the proliferation of SGC7901 cells. However, interference of RhoC expression could inhibit migration, invasion, and anchorage-independent growth of SGC7901 cells. In conclusion, RhoC may play a very important role in the metastasis of gastric carcinoma. Therapeutic strategies targeting RhoC and RhoC-mediated pathways may be a novel approach for treating metastasis of gastric cancer.     

MicroRNA-9通过NRP1抑制胃癌SGC-7901细胞上皮-间充质转化功能

目的:研究微小RNA-9(microRNA-9,miR-9)对胃癌SGC-7901细胞上皮-间充质转化(EMT)功能的影响及其相关机制。方法:SGC-7901胃癌细胞株分别转染miR-9 mimics和阴性对照序列(negative control mimic,NCM),作为miR-9组和NCM组,并设立未转染对照(control)组,采用RT-qPCR法检测各组细胞miR-9的含量,Transwell实验检测3组细胞迁移能力和侵袭能力,Western blot法检测3组细胞的N-cadherin、E-cadherin、α-catenin和神经纤毛蛋白1(NRP1)表达水平。采用Western blot法检测NRP1过表达对miR-9抑制EMT的拮抗作用。双萤光素酶实验检测miR-9与NRP1的关系。结果:miR-9组的miR-9表达水平明显上调,为control组的538倍(P0.05)。miR-9组的迁移细胞数量明显低于control组(P0.05)。miR-9组的侵袭细胞数量明显低于control组(P0.05)。miR-9组细胞的N-cadherin和NRP1蛋白表达量明显降低,E-cadherin及α-catenin蛋白表达量明显升高。而NRP1及miR-9均过表达组胃癌细胞中N-cadherin蛋白表达量明显升高,E-cadherin及α-catenin蛋白表达量明显降低。双萤光素酶检验结果显示NRP1为miR-9的下游靶基因(P0.05)。结论:miR-9可能通过降低下游靶基因NRP1水平影响EMT相关蛋白表达,抑制胃癌SGC-7901细胞的EMT功能。