circNEIL3靶向miR-218-5p对口腔鳞状细胞癌细胞增殖、凋亡、迁移、侵袭的影响

该文旨在探讨circNEIL3对口腔鳞癌细胞生物学行为的影响及其可能的作用机制。采用qRT-PCR法检测口腔鳞癌组织、癌旁组织、人口腔鳞癌细胞(CAL-27、SCC-25、SCC-9、HSC-3)以及正常口腔角质细胞HOK中circNEIL3、miR-218-5p的表达量;以CAL-27细胞为研究对象,si-circNEIL3、miR-218-5p mimics、si-NC、miR-NC分别转染至CAL-27细胞, si-circNEIL3和antimiR-NC、si-circNEIL3和anti-miR-218-5p分别共转染至CAL-27细胞; MTT法检测CAL-27细胞增殖情况;流式细胞术检测CAL-27细胞凋亡情况; Transwell检测CAL-27细胞侵袭和迁移情况。双荧光素酶报告实验检测circNEIL3与miR-218-5p的靶向关系; Western blot检测Bax、Bcl-2、caspase-3、cleaved-caspase-3蛋白表达量。与癌旁组织相比,口腔鳞癌组织中circNEIL3的表达量升高(P<0.01),miR-218-5p的表达量降低(P...     

口腔鳞癌组织细胞凋亡相关蛋白Fas/FasL的表达研究

目的　研究调亡相关蛋白Fas、FasL在口腔鳞状细胞癌组织中的表达及意义。方法　应用免疫组织化学方法检测 10例正常口腔粘膜、 38例口腔鳞癌组织及肿瘤浸润淋巴细胞 (TIL)和 11例转移淋巴结中Fas、FasL的表达。结果　Fas在正常口腔粘膜中广泛表达 ;鳞癌组织表达明显下调 (P <0 .0 5 ) ;Fas表达与口腔鳞癌分化程度有关 ;淋巴结转移癌中Fas表达减弱。FasL在正常口腔粘膜不表达 ;鳞癌组织表达明显上调 (P <0 .0 5 ) ;FasL表达与口腔鳞癌分化程度无关 (P >0 .0 5 ) ;有淋巴结转移者FasL阳性表达率高于无转移者 (P <0 .0 5 )。TIL细胞Fas、FasL阳性表达率为 81.6 %和 84 .2 % .。Fas、FasL在口腔鳞癌的表达有明显相关性 (P <0 .0 5 )。结论　Fas表达与口腔粘膜上皮细胞的自然分化成熟衰老及口腔鳞癌的形成和肿瘤的恶性度有关。FasL的表达上调可能是口腔鳞癌组织免疫反攻击的体现 ,对促进肿瘤的发生发展及转移有重要作用。     

DKK-1和MMP-14在口腔鳞癌中的表达及其意义

目的:研究DKK-1蛋白和MMP-14蛋白在口腔鳞状细胞癌组织中的表达和临床意义。方法:选择口腔鳞癌石蜡标本62例作为实验组,25例正常口腔黏膜组织作为对照组。应用免疫组织化学法检测其DKK-1和MMP-14蛋白的表达,并分析二者与口腔鳞癌患者临床病理特征之间的关系及二者表达的相关性。结果:实验组DKK-1的阳性表达率为40.32%,明显低于对照组中(68%),而MMP-14的阳性表达率(72.58%)明显高于对照组(24%)(P0.05)。DKK-1和MMP-14的表达水平与口腔鳞癌的分期、淋巴结转移及分化程度有显著相关(P0.05)。口腔鳞癌组织中DKK-1和MMP-14蛋白的表达呈显著负相关(r=-0.600,P0.05)。结论:口腔鳞状细胞癌组织中DKK-1的表达下调,MMP-14的表达上调,二者可能参与了OSCC的发生和发展过程,并有望用于口腔鳞状细胞癌的病情和预后评估。     

PLCE1与MMP-9在口腔鳞癌中的表达及其临床意义*

目的:探讨磷脂酶Cε1(PLCE1)与基质金属蛋白酶-9(MMP-9)在口腔鳞癌中的表达及临床意义。方法:采用免疫组化方法检测61例口腔鳞癌组织和35例正常口腔黏膜组织中PLCE1和MMP-9的蛋白表达,并分析二者与口腔鳞状细胞癌临床病理参数的关系及二者的相关性。结果:PLCE1在口腔鳞癌组织中表达阳性率为68.85%(42/61),MMP-9在口腔鳞癌组织中表达阳性率为75.40%(46/61),两者在正常口腔黏膜组织中表达阳性率分别为14.28%(5/35)、17.14%(6/35)。PLCE1和MMP-9在正常口腔黏膜组织的阳性表达率均明显低于口腔鳞癌组织(P0.01)。PLCE1与MMP-9的高度阳性表达和患者的性别、年龄、吸烟及肿瘤大小无明显相关性,但与肿瘤TNM分期以及组织分化程度显著相关。口腔鳞癌组织中PLCE1和MMP-9的高表达呈明显正相关(r=0.438,P0.01)。结论:PLCE1和MMP-9的过度表达均与口腔鳞癌的发生、发展及侵袭转移有密切相关性,并检测二者可能会对口腔鳞癌患者的早期临床诊断及预后判断具有一定的参考价值。     

AEG-1和MMP-9在口腔鳞癌中的表达与临床意义

目的:研究星形细胞提升基因-1(AEG-1)与基质金属蛋白酶-9(MMP-9)在口腔鳞癌组织中的表达及其临床意义。方法:采用免疫组化的方法检测53例口腔鳞癌组织和30例正常口腔黏膜组织中AEG-1和MMP-9的蛋白表达,分析其与口腔鳞癌临床病理参数的关系及二者的相关性。结果:AEG-1和MMP-9在口腔鳞癌组织中表达阳性率分别为66.03%(35/53)、73.58%(39/53),在正常口腔黏膜组织中表达阳性率分别为13.33%(4/30)、16.67%(5/30)。AEG-1和MMP-9在口腔鳞癌组织中阳性表达率均高于正常口腔黏膜组织(P0.01)。高表达的AEG-1和MMP-9与口腔鳞癌的组织分化程度,淋巴结转移以及临床分期有密切相关性,但与患者的性别、年龄及吸烟史无相关性。口腔鳞癌组织中AEG-1与MMP-9的表达呈显著正相关(r=0.474,P0.01)。结论:AEG-1和MMP-9的高表达均与口腔鳞癌的发生、发展及转移有密切相关性,同时检测二者可能会对口腔鳞癌的早期诊断及预后判断具有一定的临床参考价值。     

ING4和HIF-1α在口腔鳞癌中的表达及临床意义

目的:探讨人口腔鳞状细胞癌(OSCC)组织中生长抑制因子4(ING4)和缺氧诱导因子-1α(HIF-1α)的表达及其临床意义。方法:选择我院确诊的口腔鳞癌患者共计65例,均经过手术治疗,术前未行放化疗,切除标本经过石蜡包埋切片,同时选取20例正常口腔黏膜作为对照。采用免疫组化S-P法检测人口腔鳞状细胞癌和正常口腔黏膜组织中ING4和HIF-1α的表达,并分析其与OSCC患者临床病理特征的相关性及人口腔鳞状细胞癌组织中ING4和HIF-1α表达的相关性。结果:OSCC组织中ING4的阳性表达率为41.5%(27/65),显著低于正常口腔黏膜组织(P0.05);OSCC组织中HIF-1α的阳性表达率为64.6%(42/65),显著高于正常口腔黏膜组织(P0.05)。ING4和HIF-1α的表达与OSCC的病理分级、TNM分期和是否有淋巴结转移显著相关(P0.05);OSCC组织中,ING4的表达与HIF-1α的表达呈显著负相关(P0.05)。结论:口腔鳞状细胞癌组织中ING4的表达下调,HIF-1α的表达上调,二者可能通过负向调控作用在口腔鳞状细胞癌的发生、发展、侵袭和转移中发挥着重要作用。     

人口腔鳞癌组织中HIF-1a和NF-kB的表达及意义

目的:探讨缺氧诱导因子(HIF-1a)和核因子-KB(NF-KB)口腔鳞癌中的表达及相互关系,研究它们的表达与肿瘤临床病理指标的联系.方法:应用SP染色法检测HIF-1a和NF-KB在49例口腔鳞癌组织、10例正常口腔黏膜组织中的阳性率.结果在口腔鳞癌中HIF-1a和NF-KB的阳性表达率分别为80.0%和78.4%,其阳性率及表达等级均显著高于正常对照组(P<0.05),在中一低分化组和有淋巴结转移组中的表达显著高于高分化组和无淋巴结转移组(P<0.05).HIF-1a表达与NF-KB表达成等级正相关(r=0.45,P<0.05).结论:HIF-1a或NF-KB与口腔鳞癌生物学行为有密切关系,二者的联合检测,有助于口腔鳞癌恶性程度和生物学特性的判断.     

MACC1和C-Met在口腔白斑和口腔鳞状细胞癌中的表达及意义

目的:探讨分析MACC1和C-Met在正常口腔黏膜、口腔白斑及口腔鳞状细胞癌中的表达及其临床意义。方法:采用免疫组化SP法检测20例口腔黏膜、20例上皮异常增生白斑、50例口腔鳞癌组织中的MACC1、C-Met蛋白的表达情况,采用X2和spearman等级相关分析对结果进行判定。结果:MACC1、C-Met蛋白在异常增生型白斑和口腔鳞癌中的阳性表达率分别为50%、76%,35%、66%,均明显高于正常口腔黏膜(17.6%,5.0%),差异均有统计学意义(P0.05)。MACC1和C-Met蛋白表达与口腔鳞癌的分期、淋巴结转移及分化程度密切相关(P0.05)。Spearman等级相关分析显示口腔白斑及口腔鳞癌中MACC1和C-Met的表达呈现正相关(P0.05)。结论:MACC1和C-Met在上皮不典型增生性白斑和口腔鳞癌中高表达,二者在口腔黏膜白斑的癌变和口腔鳞癌的发生发展中可能起重要作用。     

转录因子Hey1在非小细胞肺癌中的表达及临床意义

目的检测Hey1与Notch1在非小细胞肺癌组织中的表达,探讨Hey1在非小细胞肺癌中的表达与Notch1的表达、各临床病理特征之间的关系。方法制作组织芯片,采用免疫组织化学染色检测Notch1和Hey1在246例非小细胞肺癌组织及相应117例癌旁正常肺组织中的表达,应用SPSS 21.0进行统计分析。结果 Notch1在肺鳞癌、肺腺癌和癌旁正常肺组织的阳性率分别为78.8%,28.9%和30.8%,Hey1在肺鳞癌、肺腺癌和癌旁正常肺组织中的阳性率分别为79.7%,23.4%和33.3%;肺鳞癌患者Notch1阳性表达与TNM分期和淋巴结转移情况呈正相关;肺鳞癌患者Hey1阳性表达与TNM分期呈正相关,与肿瘤分化程度呈负相关;Spearman相关分析显示,肺鳞癌和肺腺癌组织中Notch1表达与Hey1表达具有显著的正相关关系。结论 Hey1和Notch1与肺鳞癌的恶性程度密切相关,可能是肺鳞癌发生、发展的重要参与因子。     

HSPC300蛋白的表达对原发性结肠癌细胞迁移能力的影响

目的：探讨HSPC300蛋白与原发性结肠癌发生与发展的关系,及其异常表达的细胞生物学意义。方法：用免疫组织化学方法分析HSPC300蛋白在正常、腺瘤及结肠腺癌中的表达;通过体外细胞迁移系统观察异常表达的HSPC300对结肠癌细胞迁移能力的影响。结果：HSPC300在正常结肠组织中的表达阳性率为25％（5／20）,在结肠腺瘤组织中为15％（3／20）,结肠癌组织中为68％（15／22）。HSPC300在结肠正常组织及腺瘤组织中的表达频率显著低于腺癌（P=-0．0002）。体外迁移实验表明,下调结肠癌细胞中HSPC300的表达可降低其迁移能力。结论：HSPC300在结肠癌的发生、发展过程中是一个晚期分子事件,其高表达有助于结肠癌细胞获得转移潜能。     

Cell surface colligin/Hsp47 associates with tetraspanin protein CD9 in epidermoid carcinoma cell lines

Hsps expressed on the cell surface have been associated with tumor invasiveness and used as targets for molecular surveillance. The present study utilized four human oral squamous cell carcinoma cells lines, SCC-4, SCC-9, SCC-15, SCC-25, the murine epidermoid carcinoma cell line LL/2, and primary cultures of human gingival fibroblasts to assess the cell surface expression of colligin/Hsp47, a proposed marker for malignancy. Immunoprecipitation studies following protein crosslinking revealed that Hsp47 was associated with a number of membrane proteins including the tetraspanin CD9. Cytometric analyses were performed to determine the distribution of cell surface colligin/Hsp47 during the phases of the cell cycle. These studies showed that colligin/Hsp47 was not limited to any phase of the cell cycle in epidermoid carcinoma cells. Boyden chamber tumor invasion assays and colloidal gold migration assays utilizing a reconstituted basement membrane (Matrigel), collagen type I, and laminin-5 substrates revealed that cell lines expressing constitutive high levels of colligin/Hsp47 manifested the lowest invasion and migration indices. The incorporation of antibodies against Hsps into the migration and invasion assays, likewise, increased the invasion indices and the phagokinetic migration indices. These data indicate that colligin/Hsp47 is anchored to the cell membrane in a complex with CD9 where it moderates tumor cell invasion and motility possibly by acting as a serpin protein inhibitor or as a receptor for collagen.     

Long noncoding RNA LINC00961 inhibited cell proliferation and invasion through regulating the Wnt/β-catenin signaling pathway in tongue squamous cell carcinoma

Tongue squamous cell carcinoma (TSCC) is the most frequent style of oral squamous cell carcinoma. However, the molecular mechanisms and function of LINC00961 in the TSCC progression remain unknown. In this study, we proved that LINC00961 expression was downregulated in TSCC cells (Tca8113, SCC1, SCC-4, and SCC-15) compared with normal tissue. In addition, we showed that LINC00961 expression was downregulated in TSCC samples compared with matched normal tissues. Moreover, ectopic expression of LINC00961 decreased TSCC cell growth and invasion and suppressed epithelial-mesenchymal transition in TSCC cell. Furthermore, we indicated that overexpression of LINC00961 decreased β-catenin expression. Knockdown of LINC00961 promoted cell proliferation and invasion partly via promoting the Wnt/β-catenin signaling pathway. These results suggested that LINC00961 was downregulated in TSCC tissues and acted as a tumor suppressor gene in the development of TSCC.     

Squamous cell carcinoma cells differentially stimulate NK cell effector functions: the role of IL-18

Tumor cells stimulate natural killer (NK) cell effector functions, but the regulation of cytokine secretion and cytolysis is incompletely understood. We tested whether oral and pharyngeal squamous cell carcinoma cell lines differentially stimulated NK cell interferon-gamma (IFN-gamma) secretion and cytolysis using a clone of the NK-92-transformed human NK cell line, NK92.35. SCC-4 and SCC-25 cells, but not FaDu or Cal 27 cells, stimulated robust NK92.35 IFN-gamma secretion. All four carcinoma cell lines were lysed by NK92.35 cells. These findings indicate that carcinoma cells differentially stimulate NK cell IFN-gamma secretion and cytolysis. In Transwell experiments, a combination of SCC-4 or SCC-25 cell soluble factors and contact with FaDu cells synergistically stimulated NK92.35 cell IFN-gamma secretion. Stimulatory SCC-4 cells constitutively secreted IL-18, a cytokine that potently augments IFN-gamma secretion by T cells and NK cells. In contrast, poorly stimulatory FaDu cells produced little or no IL-18, but synergized with recombinant IL-18 to stimulate NK92.35 IFN-gamma secretion. mAb to IL-18 or IL-18 receptor diminished SCC-4-stimulated IFN-gamma secretion by NK92.35 cells and by nontransformed NK cells. Thus, IL-18 was necessary for optimal carcinoma stimulation of NK cell IFN-gamma secretion. In vivo, oral and upper aerodigestive tract epithelia and carcinomas produced IL-18, but one squamous cell carcinoma had heterogeneous IL-18 expression. Thus IL-18 production can account for squamous cell carcinoma differential stimulation of NK cell effector functions in vitro and may be important for stimulation of NK cells in vivo.     

MicroRNA and protein profiles in invasive versus non-invasive oral tongue squamous cell carcinoma cells in vitro

Complex molecular pathways regulate cancer invasion. This study overviewed proteins and microRNAs (miRNAs) involved in oral tongue squamous cell carcinoma (OTSCC) invasion. The human highly aggressive OTSCC cell line HSC-3 was examined in a 3D organotypic human leiomyoma model. Non-invasive and invasive cells were laser-captured and protein expression was analyzed using mass spectrometry-based proteomics and miRNA expression by microarray. In functional studies the 3D invasion assay was replicated after silencing candidate miRNAs, miR-498 and miR-940, in invasive OTSCC cell lines (HSC-3 and SCC-15). Cell migration, proliferation and viability were also studied in the silenced cells. In HSC-3 cells, 67 proteins and 53 miRNAs showed significant fold-changes between non-invasive vs. invasive cells. Pathway enrichment analyses allocated “Focal adhesion” and “ECM-receptor interaction” as most important for invasion. Significantly, in HSC-3 cells, miR-498 silencing decreased the invasion area and miR-940 silencing reduced invasion area and depth. Viability, proliferation and migration weren’t significantly affected. In SCC-15 cells, down-regulation of miR-498 significantly reduced invasion and migration. This study shows HSC-3 specific miRNA and protein expression in invasion, and suggests that miR-498 and miR-940 affect invasion in vitro, the process being more influenced by mir-940 silencing in aggressive HSC-3 cells than in the less invasive SCC-15.     

Tumor-suppressive microRNA-10a inhibits cell proliferation and metastasis by targeting Tiam1 in esophageal squamous cell carcinoma

Aberrant microRNAs (miRNAs) expressions could contribute to the progression of numerous cancers, including esophageal squamous cell carcinoma, while miR-10a participates in multiple biological processes on cancers. However, the molecular mechanism of miR-10a in esophageal squamous cell carcinoma (ESCC) has not been investigated. Herein, miR-10a was significantly reduced in ESCC clinical tissues and ESCC cell lines (EC109 and TE-3). In addition, immunohistochemistry indicated that the expressions of α-SMA, Ki-67, and PCNA in tumor tissues were higher than that of controls. In vitro, overexpression of miR-10a dramatically suppressed cell proliferation and enhanced cell apoptosis, while the decrease of miR-10a expressed the opposite outcome. Specially, overexpression of miR-10a caused a G0/G1 peak accumulation. Moreover, miR-10a also negatively regulated ESCC cell migration and invasion. Furthermore, targetscan bioinformatics predictions and the dual-luciferase assay confirmed that Tiam1 was a direct target gene of miR-10a. The statistical analysis showed Tiam1 was negatively in correlation with miR-10a in ESCC patient samples. And silencing Tiam1 could lead to a decline on cell growth, invasion, and migration in ESCC cell lines, while it could enhance cell apoptosis and cause a G0/G1 peak accumulation. In vivo, it revealed that miR-10a notably decreased the tumor growth and metastasis in xenograft model and pulmonary metastasis model. And it showed a lower expressions of Tiam1 in the miR-10a mimics group by immunohistochemistry. Taken together the results, they indicated that miR-10a might function as a novel tumor suppressor in vitro and in vivo via targeting Tiam1, suggesting miR-10a to be a candidate biomarker for the ESCC therapy.     

Integrin- and Cadherin-Mediated Induction of the Matrix Metalloprotease Matrilysin in Cocultures of Malignant Oral Squamous Cell Carcinoma Cells and Dermal Fibroblasts

Matrilysin is a matrix metalloprotease (MMP) overexpressed in a number of cancers including skin, head and neck squamous cell carcinomas, and prostate and colon adenocarcinomas. Matrilysin has been shown to play a role in the degradation of the basement membrane that separates epithelium from stroma allowing tumor cells to intravasate into the bloodstream and metastasize. Here, we show that an oral squamous cell carcinoma cell line (SCC-25) expresses low levels of promatrilysin when cultured alone. However, when SCC-25 cells are cocultured with human foreskin fibroblasts (HFF), there is a 40-fold induction of promatrilysin expression. We tested whether this induction of promatrilysin expression was due to the release of paracrine factors, cell-cell interactions, or cell-matrix interactions. Our results indicate induced promatrilysin expression is the result of both cell-cell and cell-matrix interactions. We demonstrate that beta1 integrins as well as cadherins, specifically N-cadherin and E-cadherin, are involved in the induction of promatrilysin expression. Our results are of general interest in relation to the regulation of MMP expression through cell surface receptor regulation. Further investigation may lead to the identification of novel targets for suppression of invasion and metastasis in oral tumors.     

Downregulation of Microrna‐148a in Cancer‐Associated Fibroblasts from Oral Cancer Promotes Cancer Cell Migration and Invasion by Targeting Wnt10b

It is well established that crosstalk between cancer‐associated fibroblasts (CAFs) and cancer cells plays a critical role in the occurrence and development of oral squamous cell carcinoma (OSCC). The molecular mechanisms underlying such interaction, however, remain far from clear. Accumulating data have indicated that microRNAs involved in tumor microenvironment, particularly in CAFs, contribute to the activation of fibroblasts and metastasis of cancer cells. Here, we showed that miR‐148a was downregulated in CAFs compared with normal fibroblasts isolated from clinical OSCC tissue. Investigation of miR‐148a function in fibroblasts demonstrated that overexpression of miR‐148a in CAFs significantly impaired the migration and invasion of oral carcinoma cells (SCC‐25) by directly targeting WNT10B. Taken together, these data suggested that miR‐148a might be a novel candidate target for the treatment of OSCC.     

Neuropilin-1 Promotes Epithelial-to-Mesenchymal Transition by Stimulating Nuclear Factor-Kappa B and Is Associated with Poor Prognosis in Human Oral Squamous Cell Carcinoma

Background

The epithelial-to-mesenchymal transition (EMT) is a key process in carcinogenesis, invasion, and metastasis of oral squamous cell carcinoma (OSCC). In our previous studies, we found that neuropilin-1 (NRP1) is overexpressed in tongue squamous cell carcinoma and that this overexpression is associated with cell migration and invasion. Nuclear factor-kappa B (NF-κB) plays an essential role both in the induction and the maintenance of EMT and tumor metastasis. Therefore, we hypothesized that NRP1 induces EMT, and that NRP1-induced migration and invasion may be an important mechanism for promoting invasion and metastasis of OSCC through NF-κB activation.

Methods/Results

The variations in gene and protein expression and the changes in the biological behavior of OSCC cell lines transfected with a vector encoding NRP1, or the corresponding vector control, were evaluated. NRP1 overexpression promoted EMT and was associated with enhanced invasive and metastatic properties. Furthermore, the induction of EMT promoted the acquisition of some cancer stem cell (CSC)-like characteristics in OSCC cells. We addressed whether selective inhibition of NF-κB suppresses the NRP1-mediated EMT by treating cells with pyrrolidinedithiocarbamate ammonium (PDTC), an inhibitor of NF-κB. Immunohistochemical analysis of NRP1 in OSCC tissue samples further supported a key mediator role for NRP1 in tumor progression, lymph node metastasis, and indicated that NRP1 is a predictor for poor prognosis in OSCC patients.

Conclusion

Our results indicate that NRP1 may regulate the EMT process in OSCC cell lines through NF-κB activation, and that higher NRP1 expression levels are associated with lymph node metastasis and poor prognosis in OSCC patients. Further investigation of the role of NRP1 in tumorigenesis may help identify novel targets for the prevention and therapy of oral cancers.     

Inhibition of Calcium-Activated Chloride Channel ANO1/TMEM16A Suppresses Tumor Growth and Invasion in Human Lung Cancer

Lung cancer or pulmonary carcinoma is primarily derived from epithelial cells that are thin and line on the alveolar surfaces of the lung for gas exchange. ANO1/TMEM16A, initially identified from airway epithelial cells, is a member of Ca²⁺-activated Cl^- channels (CaCCs) that function to regulate epithelial secretion and cell volume for maintenance of ion and tissue homeostasis. ANO1/TMEM16A has recently been shown to be highly expressed in several epithelium originated carcinomas. However, the role of ANO1 in lung cancer remains unknown. In this study, we show that inhibition of calcium-activated chloride channel ANO1/TMEM16A suppresses tumor growth and invasion in human lung cancer. ANO1 is upregulated in different human lung cancer cell lines. Knocking-down ANO1 by small hairpin RNAs inhibited proliferation, migration and invasion of GLC82 and NCI-H520 cancel cells evaluated by CCK-8, would-healing, transwell and 3D soft agar assays. ANO1 protein is overexpressed in 77.3% cases of human lung adenocarcinoma tissues detected by immunohistochemistry. Furthermore, the tumor growth in nude mice implanted with GLC82 cells was significantly suppressed by ANO1 silencing. Taken together, our findings provide evidence that ANO1 overexpression contributes to tumor growth and invasion of lung cancer; and suppressing ANO1 overexpression may have therapeutic potential in lung cancer therapy.     

PAI-1过表达促进食管鳞癌细胞的侵袭和迁移

食管癌是常见的恶性肿瘤之一。由SERPINE1基因编码的纤溶酶原激活物抑制因子1(plasminogen activator inhibitor-1,PAI-1)已被报道在多种类型癌症患者的肿瘤组织中存在高表达并参与癌症进展。为探讨PAI-1蛋白在食管鳞癌中的作用及其分子机制,本研究首先利用Westernblot实验和酶联免疫吸附实验(enzyme linked immunosorbent assay, ELISA)检测各食管鳞癌细胞系中PAI-1的表达和分泌水平,结果显示,PAI-1高表达的食管鳞癌细胞系分泌至细胞外的PAI-1水平相对较高。进一步选取PAI-1表达及分泌水平均较高的KYSE150和KYSE450细胞系作为研究模型,通过si RNA(小干扰RNA)瞬时转染和Transwell实验证实敲降SERPINE1可显著抑制食管鳞癌KYSE150和KYSE450细胞的侵袭和迁移。同时,构建了慢病毒介导的SERPINE1稳定敲降细胞株KYSE150和KYSE450,将SERPINE1稳定敲降的细胞培养基中外源加入PAI-1蛋白进行Transwell回复实验,结果表明PAI-1过表达可增强食管鳞癌细胞的侵袭和迁移能力。体内实验结果显示,降低PAI-1表达可显著抑制食管鳞癌细胞的成瘤和肺转移能力。分子水平检测表明PAI-1过表达可激活AKT和ERK信号通路,免疫共沉淀(co-immunoprecipitation,Co-IP)实验结果进一步显示PAI-1可能与膜受体LRP1(LDLreceptor related protein1)存在相互作用。上述研究结果表明,PAI-1可能通过与LRP1相互作用进而促进食管鳞癌细胞的侵袭和迁移。