顺铂对人肺腺癌细胞作用与ERCC1、Bcl-2表达的相关性研究

目的:探讨ERCC1、Bcl-2表达与顺铂作用的关系,进而推测ERCC1、Bcl-2在顺铂耐药中的作用.方法:选择人肺腺癌细胞A549及其耐DDP细胞株A549/DDP作为研究对象,采用MTT法检测A549/DDP细胞耐药指数;免疫细胞化学方法、RT-PCR方法检测不同浓度、不同作用时间干预后细胞中ERCC1、Bcl-2的表达.结果:10μg/mL DDP作用12 h,A549细胞中ER-CC1、Bcl-2 mRNA表达开始增高,随着作用时间的延长,ERCC1、Bcl-2 mRNA的表达逐渐增高,在72 h表达最强.浓度为5μg/mL的DDP即可刺激A549细胞中ERCC1、Bcl-2 mRNA表达水平上升,随着DDP浓度的增加,其表达水平逐渐上升,ERCC1民mRNA表达水平在20μg/mL组达到高峰.与亲本细胞相比,A549/DDP中ERCC1、Bcl-2表达明显增高.结论:随着顺铂作用时间的延长和浓度的增加,A549细胞中ERCC1、Bcl-2 mRNA和蛋白的表达量增加,推测ERCC1、Bcl-2可能参与了顺铂继发耐药的形成.     

草酸铂对CHO细胞系野生型AA8和突变型UV20的DNA损伤作用

目的 探讨交叉互补集团1基因(ERCC1)蛋白在草酸铂毒性作用的影响,找寻草酸铂药物抵抗性的关键因子.方法 中国仓鼠卵巢细胞系野生型AA8以及ERCC1表达缺失型UV20可以作为细胞对照模型.SRB细胞抑制率实验、改良彗星实验、Rad51免疫荧光实验评价草酸铂染毒后不同时点的DNA损伤程度.结果 AA8和UV20对草酸铂的敏感性不同,IC50相差近16倍.改良彗星实验和Rad51免疫荧光实验同时表明,AA8与UV20相比,具有修复草酸铂所致DNA损伤能力.结论 ERCC1蛋白具有重要的核酸内切酶功能,对于修复草酸铂所致DACH-Pt-DNA加合物具有重要意义.     

ERCC1表达与上皮性卵巢癌铂类药物疗效间的关系

目的评估ERCC1-mRNA表达水平对于上皮性卵巢癌患者(epithelial ovarian cancer,EOC)含铂类化疗的疗效预测价值。方法收集中国医科大学肿瘤医院2008年至2010年78例含铂化疗的EOC患者的血液及术后标本进行研究,采用RT-PCR的方法检测ERCC1、Bax、Bcl-2基因mRNA水平的表达。分析ERCC1-mRNA表达水平与EOC患者的临床病理特征、无进展生存(PFS)之间的关系。结果 78名入组患者中,ERCC1-mRNA化疗后显著增加组(ERCC1-H,44名患者)与ERCC1-mRNA化疗后变化不明显组(ERCC1-L,34名患者)的PFS差距明显(P<0.05),且化疗后ERCC1-H组Bax基因mRNA水平高于ERCC1-L组(P<0.05),而Bcl-2基因mRNA水平低于ERCC1-L组(P<0.05)。ERCC1-H组的无疾病进展生存期平均为18.5个月,而ERCC1-L组的无疾病进展生存期平均为26.9个月。结论 ERCC1-mRNA的表达可作为卵巢癌铂类药物耐药性与敏感性预测的重要参考。     

大肠癌BRCA-1、ERCC1mRNA表达水平对铂类化疗预后的影响分析

目的 探讨大肠癌乳腺癌易感蛋白1(BRCA-1)、核苷酸切除修复交叉互补基因1信使核糖核酸(ERCC1mRNA)的表达水平对铂类化疗预后的影响.方法 58例大肠癌患者,均采用FOLFOX化疗方案治疗.对患者手术标本进行BRCA-1、ERCC1mRNA表达水平检测.分析大肠癌组织中BRCA-1、ERCC1mRNA表达情况...     

镉恶化转化16HBE细胞中核苷酸切除修复基因的表达

目的 探讨氯化镉恶性转化人支气管上皮(16HBE)细胞过程中核苷酸切除修复基因ERCC1和ERCC2基因的mRNA和蛋白动态变化规律.方法 用反转录.聚合酶链反应(RT-PCR)和免疫组织化学(SP法)检测16HBE细胞、氯化镉恶性转化16HBE细胞不同阶段(第5、15、35代细胞及成瘤细胞)ERCC1和ERCC2基因的mRNA和蛋白的表达情况.结果 随着转化代数的增加,ERCC1基因mRNA和蛋白的表达逐渐降低,到第35代细胞后表达明显下降(P＜0.01);而ERCC2基因的mRNA和蛋白表达水平在氯化镉恶性转化16HBE细胞过程中差异无统计学意义(P＞0.05).结论 镉化物的致癌机制可能与ERCC1基因表达水平下调有关.     

非小细胞肺癌患者ERCC1表达与铂类药物化疗敏感性的相关性的系统分析

目的 分析非小细胞肺癌患者ERCC1表达与对铂类药物治疗敏感性的相关性。 方法 电子检索Medline（1991~2009.12）、Pubmed、CBMDisc等数据库,对回顾性病例研究和随机对照临床试验进行总结分析。 结果 共纳入10篇文献,包括9篇回顾性病例研究和1篇随机对照临床试验。9篇回顾性病例研究资料结果表明,ERCC1表达阴性患者对铂类药物的联合化疗方案的反应率明显高于阳性患者（P=0.02）;1篇文献报道化疗后肿瘤进展时间ERCC1阴性组患者显著长于ERCC1阳性组患者（P〈0.05）;化疗后中位生存期具有统计学差异的2篇报道均为ERCC1阴性组高于ERCC1阳性组 （P〈0.05）。RCT研究结果表明辅助化疗可以明显延长ERCC1阴性患者的生存期,但不能延长ERCC1阳性患者的生存期。 结论 非小细胞肺癌患者中ERCC1低表达者可以从铂类化疗方案中受益,高表达者对铂类药物的化疗敏感性差,需要更好的辅助治疗方案。ERCC1作为预测NSCLC对铂类药物化疗方案敏感性的指标并指导临床个体化治疗具有临床意义。     

ERCC1基因表达与晚期非小细胞肺癌铂类化疗方案疗效的前瞻性研究

目的探讨核苷酸切除修复交叉互补组基因1（ERCC1）基因表达与晚期非小细胞肺癌铂类化疗方案的疗效。方法入组40例晚期非小细胞肺癌患者,实验组选取化疗前采用分支DNA-液相芯片技术检测确定为ERCC1 mRNA低表达的患者,对照组为同期住院的非ERCC1 mRNA低表达患者,每组各20例。每组患者行至少4个周期的含铂的化疗方案治疗,评价两组的化疗反应率、疾病进展时间。结果实验组患者的化疗有效率、疾病进展时间分别为85.0%、11.6个月;对照组的化疗有效率、疾病进展时间分别为30.0%、7.9个月,差异有统计学意义。结论ERCC1基因表达可作为预测晚期非小细胞肺癌对含铂化疗方案的敏感性的指标。     

ERCC-1在晚期结肠癌中的表达及与奥沙利铂化疗敏感性的关系

目的探讨核苷酸切除修复交错互补基因（ERCC1）在晚期人结肠癌中的表达水平,分析其与铂类药物化疗敏感性及生存时间的关系。方法以江西省肿瘤医院行结肠癌剖腹探查术患者44例的标本为材料,采用免疫组织化学SP法检测其ERCC1表达水平,所有入组患者随访2年。结果肿瘤组织中ERCC1的阳性率为50.00%,ERCC1阴性者铂类药物化疗有效率为59.1%（13/22）,而阳性者则为27.3%（6/22）,两者之间具有统计学差异（P=0.033）;Cox回归分析显示ERCC1表达为结肠癌患者独立预后因子（P=0.002）。结论ERCC1表达可作为预测结肠癌患者对铂类药物敏感性及预后判断的指标之一。     

非小细胞肺癌的EGFR突变与ERCC1表达水平的关系探讨

目的探讨非小细胞肺癌（NSCLC）患者的表皮生长因子受体（EGFR）突变与切割修复交叉互补基因1（ERCC1）表达水平的关系,从而为非小细胞肺癌患者的临床用药提供指导。方法收集132例经病理诊断证实为NSCLC肿瘤组织标本,用实时荧光定量的聚合酶链反应-高分辨率溶解曲线分析技术（PCR-HRM）法检测EGFR基因18、19、20、21外显子突变,同时用逆转录定量PCR（qRT-PCR）检测ERCC1的mRNA的表达水平。对两者的关联性进行分析。结果41例EGFR突变型中,ERCC1基因高表达10例,低表达31例;91例EGFR野生型中,ERCC1基因高表达31例,低表达60例。EGFR基因突变状态与ERCC1的mRNA表达水平无明显关联（P〉0.05）。结论 NSCLC患者肿瘤组织中EGFR基因突变状态与ERCC1的mRNA表达水平无关联性。     

RRM1和ERCC1基因外周血中表达水平与吉西他滨联合铂类治疗晚期非小细胞肺癌疗效的相关性研究

目的:探讨外周血中DNA修复基因RRM1(核苷酸还原酶,ribonucleotide reductase M1)和ERCC1(切除修复交叉互补组基因1,excision repair cross-complementation 1)的表达水平与吉西他滨联合铂类治疗非小细胞肺癌(Nonsmall-cell lung cancer,NSCLC)疗效的相关性.方法:SYBR荧光实时定量PCR检测NSCLC组织和外周血中RRM1和ERCC1 mRNA表达水平.分类变量之间进行x2检验,连续性变量之间进行Spearman等级相关性分析;总体生存率的比较采用Kaplan-Meier生存曲线和log-rank检验.结果:本研究中,34例晚期NSCLC患者外周血RRM1和ERCC1 mRNA表达水平进行了有效地检测,22例病例同时进行了肿瘤组织和外周血的基因检测.RRM1 mRNA的相对表达量在外周血和肿瘤组织中存在线性相关性(R2=0.045,P=0.048),而ERCC1在两者之间无线性相关(R2=0.016,P=0.251).RRM1低表达组的生存期(16.0月)明显长于高表达组(12.5月)(Log-rank 3.980,P=0.046).而ERCC1的表达在两组间无统计学意义(P＞0.05).结论:研究表明,在入组的NSCLC患者中,外周血中RRM1低表达组的生存期明显长于高表达组,对化疗反应的有效率更高,其结果有助于筛选出接受吉西他滨联合铂类化疗方案的患者.     

Determination of ERCC2 Lys751Gln and GSTP1 Ile105Val gene polymorphisms in colorectal cancer patients: relationships with treatment outcome

INTRODUCTION: Glutathione S-transferase P1 (GSTP1) and excision-repair cross-complementing repair deficiency group 2 protein (ERCC2 or XPD) may modulate the activity of platinum derivatives. The SNPs, Ile105Val for GSTP1 and Lys751Gln for ERCC2, may affect the efficiency of oxaliplatin in patients treated with an oxaliplatin-based regimen for metastatic colorectal carcinoma. PATIENTS & METHODS: A total of 107 patients treated with first-line chemotherapy, 59 with an oxaliplatin-based regimen and 48 with an irinotecan-based regimen, were included retrospectively. GSTP1 and ERCC2 genotypes were identified on DNA samples extracted from paraffin blocks containing either normal tissue (nodes) or tumor tissue. We analyzed treatment response, event-free and overall survival. RESULTS: GSTP1 genotype distribution was Ile/Ile 58%, Ile/Val 35% and Val/Val 7%. ERCC2 genotype distribution was Lys/Lys 49%, Lys/Gln 44%, Gln/Gln 7%. Event-free and overall survivals were not significantly different as a function of the GSTP1 genotype, whatever the treatment received. Event-free survival was significantly different as a function of the ERCC2 genotype only in patients receiving oxaliplatin: patients having at least one variant allele had a shorter median event-free survival (6 months) than those having no variant allele (11.6 months, p = 0.008). This difference was maintained for median overall survival (15.6 vs 25.3 months, p = 0.016). Using univariate analysis, ERCC2 genotype, hemoglobinemia and carbohydrate antigen 19.9 plasma levels were significantly related to overall and event-free survival in patients receiving oxaliplatin. CONCLUSION: The ERCC2 genotype appears as an important predictive factor of the survival of patients treated with oxaliplatin in first-line therapy for metastatic colorectal cancer.     

Synergistic effect of curcumin and cisplatin via down-regulation of thymidine phosphorylase and excision repair cross-complementary 1 (ERCC1)

Curcumin (diferuloylmethane), a phenolic compound obtained from the rhizome of Curcuma longa, is known to have antiproliferative and antitumor properties. Thymidine phosphorylase (TP), an enzyme of the pyrimidine salvage pathway, is considered an attractive therapeutic target, and its expression could suppress cancer cell death induced by DNA damage agents. Excision repair cross-complementary 1 (ERCC1) is a protein involved the process of nucleotide excision repair. The ERCC1 gene is expressed at high levels in cancers and has been associated with resistance to platinum-based chemotherapy. In this study, the effects of curcumin on TP and ERCC1 expression induced by cisplatin in non-small-cell lung cancer (NSCLC) cell lines was investigated. Exposure of the NSCLC cells to various concentrations of curcumin (5-40 μM) down-regulates the mRNA and protein levels of TP and ERCC1 through destabilization of the mRNA and proteins via a mechanism involving inactivation of MKK1/2-extracellular signal-regulated kinase (ERK1/2). Depletion of endogenous TP or ERCC1 expression by transfection with specific small interfering RNAs significantly decreases cell viability in curcumin-exposed NSCLC cells. Curcumin enhances the sensitivity of cisplatin treatment for NSCLC through inactivation of ERK1/2 and by decreasing the TP and ERCC1 protein levels. Enhancement of ERK1/2 signaling by constitutively active MKK1/2 causes an increase in TP and ERCC1 protein levels and promotes cell viability after cotreatment with curcumin and cisplatin. Enhancement of the cytotoxicity to cisplatin by administration of curcumin is mediated by down-regulation of the expression levels of TP and ERCC1 and by inactivation of ERK1/2.     

Suppression of ERCC1 and Rad51 expression through ERK1/2 inactivation is essential in emodin-mediated cytotoxicity in human non-small cell lung cancer cells

Emodin, a tyrosine kinase inhibitor, is a natural anthraquinone derivative found in the roots and rhizomes of numerous plants. Emodin exhibits anticancer effects against a variety of cancer cells, including lung cancer cells. ERCC1 and Rad51 proteins are essential for nucleotide excision repair and homologous recombination, respectively. Furthermore, ERCC1 and Rad51 overexpression induces resistance to DNA-damaging agents that promote DNA double-strand breaks. Accordingly, the aim of this study was to determine the role of ERCC1 and Rad51 in emodin-mediated cytotoxicity in human non-small cell lung cancer (NSCLC) cells. Both ERCC1 and Rad51 protein levels as well as mRNA levels were decreased in four different NSCLC cell lines after exposure to emodin. These decreases correlated with the inactivation of the MKK1/2-ERK1/2 pathway. Moreover, cellular ERCC1 and Rad51 protein and mRNA levels were specifically inhibited by U0126, a MKK1/2 inhibitor. We found that transient transfection of human NSCLC cells with si-ERCC1 or si-Rad51 RNA and cotreatment with U0126 could enhance emodin-induced cytotoxicity. In contrast, overexpression of constitutively active MKK1/2 vectors (MKK1/2-CA) was shown to significantly recover reduced phospho-ERK1/2, ERCC1, and Rad51 protein levels and to rescue cell viability upon emodin treatment. These results demonstrate that activation of the MKK1/2-ERK1/2 pathway is the upstream signal regulating the expressions of ERCC1 and Rad51, which are suppressed by emodin to induce cytotoxicity in NSCLC cells.     

Combination of oxaliplatin and irinotecan on human colon cancer cell lines: activity in vitro and in vivo

The in vitro and in vivo combination of oxaliplatin and irinotecan was investigated in a panel of four human colon cancer cell lines and their counterpart xenografts. In vitro and in vivo experiments demonstrated a synergistic or additive interaction in three cell lines (HCT-116, HCT-8 and HT-29) and an antagonism in SW-620 cells. Since there were clearly opposite interactions depending on the cell line, we further investigated cellular determinants possibly involved in the interaction between the two drugs in HCT-8 and SW-620 cells. Irinotecan slowed down the early platinum-DNA adducts repair (1 h after oxaliplatin exposure) in the presence of irinotecan only in HCT-8 cells (p=0.03, n=3). Moreover, a decrease of the expression of two proteins of the nucleotide excision repair (NER) system, ERCC1 and XPA, was observed. None of these effects was seen in SW-620 cells. Irinotecan induced apoptosis with an increase of poly(ADP-ribose) polymerase (PARP) cleavage in SW-620 cells (60 versus 7% basal level). Pretreatment of these cells with oxaliplatin abolished the increase in PARP cleavage induced by irinotecan (29%). In HCT-8 cells, a very little PARP cleavage was observed whatever the drug treatment. The persistence of platinum-DNA adducts in the presence of irinotecan could be due to a direct impact of irinotecan on NER gene expression or to an indirect effect on topoisomerase I activity. Complementary studies are required to determine if the cellular parameters identified in this study could be translated at the clinical level to predict clinical response after combined treatment with oxaliplatin and irinotecan in humans.     

p53 dependent and independent sensitivity to oxaliplatin of colon cancer cells

Oxaliplatin is an efficient chemotherapeutic agent used for the treatment of metastatic human colon cancer, but cancer cells are frequently resistant. The aim of this study was to analyse the underlying mechanisms in a panel of 10 human colorectal cancer cell lines submitted to a short (2h) oxaliplatin treatment period, accordingly to the usual therapeutic procedure in humans. Sensitivity to oxaliplatin was a characteristic of p53 wild-type colon cancer cells. In contrast, all p53-mutated cell lines had a high IC50 to oxaliplatin, with the exception of the V9P cell line. Exposure to oxaliplatin resulted in G0/G1 arrest in p53 wild-type cell lines, and in S phase in p53-mutated cell lines. In our treatment conditions, no DNA accumulation in sub G0/G1 phase, no caspase-3 activation nor PARP cleavage were detected after oxaliplatin treatment, except for the V9P cell line. The major role of the p53-p21 pathway in oxaliplatin sensitivity was confirmed in the p53 wild-type HCT116 cell line, using siRNA duplex, and knockdown of the TAp73 protein also enhanced resistance to oxaliplatin in this cell line. Surprisingly, siRNA duplex invalidation revealed a residual effect of the mutant p53 protein in p53-mutated cell lines. Persistent sensitivity to oxaliplatin of the p53-mutated V9P cell line was associated with oxalipatin-induced apoptosis but TAp73 was not the responsible alternative pathway.     

Indole-3-carbinol enhances anti-proliferative, but not anti-invasive effects of oxaliplatin in colorectal cancer cell lines

The primary aim of this study was to determine whether combination of the chemopreventive agent indole-3-carbinol (I3C) with oxaliplatin would decrease proliferative index and invasive potential of human colorectal tumour cells. Combination of the agents resulted in a 170-fold decrease in proliferative capacity in SW480 and SW620 cell lines, which was approximately 6-fold greater than for oxaliplatin alone. Decreased proliferation was attributed to enhanced S-phase cell cycle arrest for SW480, and increased apoptosis for SW620 cells. The combined agents resulted in significantly increased E-cadherin levels in SW480 cells, and beta-catenin levels in both cell lines (assessed by in-cell westerns). In SW480 cells confocal microscopy revealed an increase in membrane-associated beta-catenin levels, with oxaliplatin treatments enhancing nuclear export and cytoplasmic localisation. In SW620 cells, all treatments increased membrane localisation of E-cadherin. Whilst both oxaliplatin and I3C decreased invasive capacity of SW480 cells, this was not further enhanced by the combined treatment.     

血清同型半胱氨酸、肿瘤标志物与转移性结直肠癌患者化疗疗效的相关性研究

目的:探讨血清同型半胱氨酸(Hcy)、肿瘤标志物与转移性结直肠癌(metastatic colorectal cancer,mCRC)患者化疗疗效的相关性。方法:选取2018年2月至2019年5月首都医科大学附属北京友谊医院肿瘤中心收治的76例mCRC患者,均确诊为结直肠癌Ⅳ期。采用mFOLFOX6方案(奥沙利铂+亚叶酸钙+5-氟尿嘧啶)联合贝伐珠单抗治疗4个周期,4个周期后进行疗效评价,并检测治疗前后血清癌胚抗原(CEA)、癌抗原199(CA199)、癌抗原125(CA125)和Hcy水平;采用有序Logistic回归分析CEA、CA199、CA125和Hcy水平变化与疗效的关系,采用Spearman相关系数法检测CEA、CA199、CA125和Hcy与疗效的相关性。结果:与治疗前比较,治疗后,部分缓解患者的CEA、CA199和Hcy水平明显降低,疾病稳定患者的CEA、Hcy水平明显升高,疾病进展患者的CA199、CA125和Hcy水平明显升高,上述差异均有统计学意义(P<0.05)。治疗前后Hcy的差值和治疗前后CEA的差值是临床疗效的风险因素,差值越大,临床治疗效果越差,差异具有统计学意义(P<0.05)。治疗前后CEA、CA199、CA125和Hcy水平的变化值与临床疗效的相关性由大至小排序为CEA>CA199>Hcy>CA125。结论:治疗前后血清CEA、CA199和Hcy水平的变化与mCRC患者化疗疗效相关,具有一定的临床价值。     

脂质体介导的小发夹干扰RNA对卵巢癌顺铂耐药细胞中切除修复交叉互补基因1表达的影响

目的:探讨脂质体介导的小发夹干扰RNA(shRNA)对卵巢癌顺铂耐药细胞中切除修复交叉互补基因1(ERCC1)表达的影响。方法:设计合成针对ERCC1基因的小发夹干扰RNA(ERCC1-shRNA),构建携带ERCC1-shRNA的重组质粒表达载体,采用脂质体Lipofectamine 2000转染COC1/DDP细胞。分别采用逆转录-聚合酶链反应(RT-PCR)及蛋白印迹法(Western blot)检测转染后细胞中ERCC1 mRNA及蛋白的表达,流式细胞计数检测细胞周期和细胞凋亡情况。结果:转染后COC1/DDP细胞中ERCC1mRNA表达较转染前明显降低(F=203.73,P<0.01),ERCC1蛋白表达亦显著下降。RNA干扰ERCC1基因后48h,COC1/DDP细胞的凋亡率较对照组有明显升高(t=20.65,P<0.01)。结论:构建的重组质粒表达载体转染COC1/DDP细胞可明显下调ERCC1 mRNA及蛋白的表达,诱导肿瘤细胞凋亡。     

缺氧诱导因子-1α对结直肠癌细胞上皮间质转化及 侵袭迁移的影响

摘要： 目的 探讨缺氧是否能促进不同分化程度结直肠癌细胞上皮间质转化 （EMT）, 并分析缺氧对结直肠癌细 胞侵袭、 迁移的影响。方法 分别选取 HCT116（低度分化）和 HT-29（高度分化）结直肠腺癌细胞。观察 0、 10、 25、 50、 100 及 150 mg/L 氯化钴 （CoCl2） 诱导 2 种细胞 48 h 后的形态变化。分析 0、 10、 25、 50 及 100 mg/L CoCl2 处理 48 h 后缺氧诱导因子 （HIF） -1α蛋白表达变化, 筛选出 CoCl2诱导细胞缺氧的最适合浓度。MTT 实验检测不同时间点 （0 、 24 、 48 、 72 及 96 h） CoCl2诱导 2 种结直肠癌细胞的增殖情况, 筛选出 CoCl2诱导缺氧的最佳时间。最佳浓度和时间 条件下, 对 HCT116 和 HT-29 细胞分别进行缺氧 （缺氧组） 和常氧 （常氧组） 处理, Transwell 侵袭和划痕实验检测 2 组 2 种细胞的侵袭、 迁移情况; Western blot 实验和 RT-PCR 实验检测 2 组 HIF-1α、 E-cadherin 及 Vimentin 的蛋白及 mRNA 表达水平。结果 50 mg/L CoCl2作用 48 h 时 2 种细胞均出现明显的形态改变。2 组 HCT116、 HT-29 细胞的 HIF-1α蛋白表达水平随 CoCl2浓度增加均呈先增后减趋势, 50 mg/L 为最适宜浓度 （P < 0.05）。0~96 h 时 2 种细胞不 论有无缺氧, 细胞增殖能力均呈先增后减趋势 （P＜0.05）, 48 h 为最佳作用时间。HCT116 和 HT-29 细胞系中缺氧组 穿膜细胞数和细胞迁移率均明显高于常氧组 （P＜0.05）。HCT116、 HT-29 细胞系中缺氧组 HIF-1α、 Vimentin 的蛋白 和 mRNA 表达水平均高于常氧组, 而 E-cadherin 的蛋白和 mRNA 表达水平低于常氧组（均 P＜0.05）。结论 缺氧 能诱导不同分化程度结直肠癌细胞均发生 EMT, 并能增强 2 种结直肠癌细胞的侵袭、 迁移能力。