丝甘蛋白聚糖促进非小细胞肺癌的侵袭与转移

丝甘蛋白聚糖(serglycin,SRGN)在肿瘤细胞的侵袭与转移中具有广泛的研究前景。本研究报道SRGN与肺癌细胞侵袭与转移能力之间的相关性。首先,通过检测SRGN在正常肺上皮细胞株BEAS-2B及不同侵袭与转移能力的肺癌细胞株95C、95D中的表达差异。利用shRNA干扰技术,在侵袭与转移能力强的95D细胞中建立稳定干扰SRGN表达的95D/shSRGN的细胞株,并通过RT-qPCR、Western印迹、酶联免疫吸附测定验证其敲除效率。结果显示：干扰SRGN可抑制侵袭与转移性强的95D细胞的侵袭与转移能力,减弱细胞迁移与侵袭等生物学特性,导致上皮标志物上皮细胞钙黏连蛋白（E-cadherin）表达上调,间质标志物纤维连接蛋白1（fibronectin1, FN1）及EMT（epithelial-mesenchymal transition, EMT）相关转录因子锌指E盒结合同源框1（zinc finger E-box binding homeobox 1, ZEB1）表达下调。进一步分析发现, SRGN与上皮细胞钙黏连蛋白表达成负相关（P=-0.25）,而与FN1(P=0.12)及ZEB1(P=0.35)表达成正相关,并且SRGN高表达的患者总生存时间明显少于SRGN低表达组（P=0.0077）,SRGN与ZEB1同时高表达的患者,总生存时间显著小于SRGN与ZEB1低表达患者（P=0.0005）。研究结果证实,SRGN促进上皮间质转化发生,增强非小细胞肺癌的侵袭与转移能力,为非小细胞肺癌预后提供参考。     

肺炎链球菌上调THP-1细胞分泌细胞间黏附分子1

目的 研究THP-1细胞受肺炎链球菌(SP)刺激后细胞间黏附分子1(ICAM-1)分泌水平的变化,并探讨不同来源SP对此影响的差异.方法 从温州医学院附属第二医院住院患者分离、搜集23株SP,和ATCC49619一起进行培养,并调浓度至1.0 McFarland.收集经传代、培养的THP-1细胞,调浓度至4.0×108/L,取1.0 mL加入24孔细胞培养板中,再向其中加入100 μL浓度为1.0 McFadand的SP,置37℃5％CO2环境分别孵育4和8h,吸出细胞悬液,离心取上清液.以ELISA法检测上清液中ICAM-1的浓度.以SPSS 17.0软件对检测结果进行统计分析.结果 SP刺激THP-1细胞4、8h后ICAM-1的浓度均高于相应的空白对照.血源性SP刺激THP-1细胞4、8h后ICAM-1的浓度与相应的痰源性SP间差异均无统计学意义.血源性/痰源性SP刺激THP-1细胞8h后ICAM-1的浓度均高于其刺激4h后的浓度.血源性/痰源性SP刺激THP-1细胞4h后ICAM-1的浓度均高于ATC C49619菌株刺激4h后相应的浓度,而在刺激8h后二者间差异无统计学意义.结论 SP可使THP-1细胞分泌ICAM-1增加,但其浓度变化与刺激的时间有关.血源性和痰源性SP刺激THP-1细胞分泌ICAM-1的变化比较差异无统计学意义,而二者和ATCC49619菌株间差异有统计学意义.     

LncRNA AC009686.2促进乳腺癌细胞增殖和侵袭

长非编码RNAs(long non-coding RNAs,LncRNAs)作为一类基因表达的调控因子,在多种肿瘤的发生发展中发挥关键作用,然而LncRNAs在乳腺癌中的作用及相关机制尚未完全阐明.为了寻找在乳腺癌发生发展中起关键作用的LncRNAs,本研究通过分析TCGA数据库发现,LncRNA AC009686.2...     

NID1促进人卵巢癌细胞OVCAR-3侵袭转移及分子机制的研究

Nidogen-1(NID1)是新发现的一个候选卵巢癌诊断标志物,该研究旨在初探其在卵巢癌细胞中的生物学功能。首先构建稳定过表达外源NID1的人卵巢癌细胞系OVCAR-3,然后采用划痕实验和Transwell迁移和侵袭实验检测细胞的迁移侵袭能力,并通过荧光定量PCR和Western blot检测细胞中上皮–间质转化(epithelial-mesenchymal transition,EMT)相关蛋白和ERK/MAPK通路蛋白的表达情况。结果显示,与空载细胞相比,稳定过表达NID1的OVCAR-3细胞其划痕愈合能力、细胞迁移和侵袭能力均明显增强。较之空载细胞的上皮细胞样外形,稳定过表达NID1的OVCAR-3细胞呈间质细胞样外形,其上皮细胞标志分子E-cadherin表达下调,间质细胞标志分子(包括Vimentin和N-cadherin)和EMT相关转录因子Twist-2表达上调。此外,稳定过表达NID1的OVCAR-3细胞中ERK1/2的磷酸化水平升高,经ERK/MAPK通路的抑制剂U0126下调ERK1/2的磷酸化水平后其Ecadherin、Vimentin、N-cadherin和Twist-2表达水平出现逆转。这些结果提示,NID1可能通过激活ERK/MAPK通路促进卵巢癌细胞的EMT过程,进而增强其侵袭转移的能力。     

外泌体MicroRNA-1246促进星形胶质瘤细胞增殖与侵袭的研究

目的探讨星形胶质瘤细胞来源的外泌体中microRNA-1246（miRNA-1246）是否作用于星形胶质瘤细胞,促进其增殖与侵袭。 方法实验分为对照组、miRNA-1246抑制剂组与miRNA-1246模拟物组,各组设6个复孔。首先从患者血液中分离外泌体并鉴定其成分。通过基质胶包被的Transwell小室实验检测星形胶质瘤细胞在miRNA-1246作用下侵袭能力的变化,CCK-8实验检测细胞增殖能力。利用荧光素酶报告基因验证miRNA-1246是否靶向细胞黏附分子1（CADM1）基因。最后通过Western Blot实验与RT-qPCR实验检测癌症组织中CADM1蛋白水平的含量并分析其与胶质瘤的关系。采用方差分析和t检验进行统计学分析。 结果恶性胶质瘤患者血液循环外泌体中miRNA-1246的含量为2.83±1.70,高于对照组1.00±0.50,差异具有统计学意义（t?=?6.044,P?=?0.026）。转染miRNA-1246抑制剂后细胞CADM1蛋白水平为1.79±0.17,高于对照组1.00±0.09（t?=?4.576,P?=?0.017）,细胞侵袭数量为（48.40±5.90）个,低于对照组96.50±6.70,而转染miRNA-1246模拟物后细胞侵袭数量为（123.20±9.80）个,高于对照组（96.50±6.70）个（t?=?5.258,P?=?0.002）。CCK-8实验中转染miRNA-1246抑制剂组A450值为0.49±0.08,低于对照组0.76±0.06,而转染miRNA-1246模拟物组A450值为1.03±0.09,显著升高（F?=?33.82,P?=?0.005）。荧光素酶报告实验表明细胞转染miR-?1246模拟物后荧光强度为4.98±1.86,低于对照组10.34±2.60（t?=?7.235,P?=?0.006）,而CADM1-Mut组内之间比较差异无统计学意义。 结论胶质瘤细胞外泌体中的miRNA-1246可通过靶向CADM1基因抑制蛋白表达,促进胶质瘤细胞的增殖与转移,提示循环外泌体中的miRNA-1246可作为恶性胶质瘤诊断与治疗的潜在靶点。     

上皮细胞黏附分子增强细胞间紧密连接促进乳腺癌细胞耐药

乳腺癌是致死率很高的恶性肿瘤,由ABCG2 (ATP-binding cassette G2)介导的多药耐药(multidrug resistance,MDR)是导致其化疗失败的重要原因,探讨ABCG2介导的耐药机制并探寻其关键分子是当前亟待解决的难题。上皮细胞黏附分子(epithelial cell adhesion molecule,EpCAM)参与多种肿瘤耐药,且与乳腺癌MDR密切相关,但它在ABCG2介导的乳腺癌耐药中的作用尚未阐明。本研究目的在于探究EpCAM对于ABCG2介导的乳腺癌细胞的多药耐药的调节作用及其机制。CCK8细胞毒性结果证实,相对于人乳腺癌药物敏感株MCF-7,耐药株MCF-7/MX对米托蒽醌(mitoxantrone,MX)的耐药性显著增强;Western 印迹结果显示,与MCF-7相比,MCF-7/MX细胞中ABCG2高表达,EpCAM表达上调。siRNA法敲低MCF-7/MX细胞中EpCAM可下调其ABCG2表达,并恢复对MX的敏感性。倒置显微镜观察细胞形态,发现敲低EpCAM可减少MCF-7/MX细胞间连接。免疫荧光双染法观察到EpCAM与密封蛋白1(claudin 1)在MCF-7/MX细胞共定位;进一步Western 印迹结果表明,敲低EpCAM减少MCF-7/MX细胞中密封蛋白1表达。综上所述,EpCAM可能通过与密封蛋白1相互作用,增强细胞间紧密连接,促进ABCG2介导的乳腺癌多药耐药。     

ICAM-1蛋白的表达与大肠癌侵袭转移的相关性

目的探讨ICAM-1在大肠癌(colorectal carcinoma,CRC)中的表达与其侵袭转移的关系。方法采用免疫组化SABC法及Western blotting技术检测ICAM-1蛋白在大肠正常黏膜、腺瘤和癌组织中的表达。结果免疫组化结果显示ICAM-1蛋白在CRC和腺瘤的高表达均与正常黏膜的低表达之间的差异有显著性(P0.001,P0.001);随着组织分化的降低和Dukes分期的增加,其表达呈上升的趋势;淋巴结和远处器官转移组的表达均高于未转移组(P0.01,P0.05)。Western blotting的结果显示ICAM-1的特异性条带出现在Marker标准相对分子量110KD左右,ICAM-1在CRC的阳性率高于正常黏膜的,且差异有显著性(P0.01)。结论ICAM-1在CRC的表达与其侵袭转移密切相关。     

沉默ABCE1对神经胶质瘤细胞U251增殖、迁移和凋亡的影响

ABCE1是ATP结合盒蛋白亚家族成员之一,在病毒感染,细胞增殖,抗凋亡,翻译起始和核糖体生物发生等过程中有重要的作用。为了探讨ABCE1对神经胶质瘤细胞U251增殖、迁移和凋亡的作用,本研究通过实时荧光定量PCR和免疫印迹实验检测ABCE1在神经胶质瘤细胞和正常胶质细胞中的mRNA和蛋白质表达水平,结果发现ABCE1在神经胶质瘤细胞U251中的表达高于在正常胶质细胞中的表达。利用siRNA靶向沉默ABCE1后,神经胶质瘤细胞U251中ABCE1 mRNA和蛋白的表达水平均显著减少,细胞的凋亡率显著提高,细胞增殖和迁移明显受到抑制,而且细胞对化疗药物替莫唑胺的敏感性增强。此外,沉默ABCE1后,Bcl-2的mRNA和蛋白质表达水平显著下调,而Bax的mRNA和蛋白质表达水平显著上调。以上研究结果表明,ABCE1与神经胶质瘤细胞的增殖和迁移密切相关,通过siRNA靶向沉默ABCE1基因可显著降低U251细胞的增殖和迁移能力。     

沉默ABCE1对神经胶质瘤细胞U251增殖、迁移和凋亡的影响北大核心CSCD

三磷酸腺苷结合盒蛋白E1(ABCE1)是ATP结合盒蛋白亚家族成员之一,在病毒感染、细胞增殖、抗凋亡、翻译起始和核糖体生物发生等过程中发挥重要作用。为了探讨ABCE1对神经胶质瘤细胞U251增殖、迁移和凋亡的作用,本研究通过实时荧光定量PCR和免疫印迹实验,检测ABCE1在神经胶质瘤细胞和正常胶质细胞中的mRNA和蛋白质表达水平。结果显示,ABCE1在神经胶质瘤细胞U251中的表达高于在正常胶质细胞中的表达。利用siRNA靶向沉默ABCE1后,在神经胶质瘤细胞U251中,ABCE1 mRNA和蛋白质的表达水平均显著减少,细胞的凋亡率显著提高,细胞增殖和迁移明显受到抑制,而且细胞对化疗药物替莫唑胺的敏感性增强。此外,沉默ABCE1后使Bcl-2的mRNA和蛋白质表达水平显著下调,而Bax的mRNA和蛋白质表达水平显著上调。以上结果表明,ABCE1与神经胶质瘤细胞的增殖和迁移密切相关,通过siRNA靶向沉默ABCE1基因,可显著降低U251细胞的增殖和迁移能力。     

人卵巢癌A2780 细胞侵袭转移与HES1 相关性

目的:探讨人卵巢癌细胞A2780中的HES1表达与人卵巢癌侵袭及转移的关系。方法:分别运用实时RT-PCR、WesternBlotting及细胞免疫荧光法检测γ分泌酶抑制剂作用前后A2780细胞中HES1的表达水平,Transwell小室试验及MTT法分别用于检测细胞的侵袭、迁移及黏附能力。结果:下调A2780细胞中HES1的表达水平后,A2780细胞的黏附、侵袭及转移能力下降,差异有统计学意义(P<0.01)。结论:HES1的表达与人卵巢癌细胞的侵袭及转移密切相关,下调其表达可抑制卵巢癌细胞的黏附、侵袭及转移能力。     

Insulin-like growth factor 1 ameliorates pre-eclampsia by inhibiting zinc finger E-box binding homeobox 1 by up-regulation of microRNA-183

As a common hypertensive complication of pregnancy, preeclampsia (PE) remains one of the leading causes of maternal and fetal with high morbidity and mortality worldwide. Much research has identified the vital functions of insulin-like growth factor 1 (IGF-1) in PE treatment. However, the combined roles and molecular mechanism of IGF-1 and microRNAs (miRNAs) underlying PE remain unclear. Therefore, we first measured the expression of IGF-1, zinc finger E-box binding homeobox 1 (ZEB1) and microRNA-183 (miR-183) expression in the placenta tissues of patients with PE by Western blot analysis and RT-qPCR. Interactions among IGF-1, ZEB1 and miR-183 were assessed by Western blot analysis, ChIP-PCR and dual-luciferase reporter gene assay. The effect of IGF-1 on the biological characteristics of trophoblast cells was investigated by CCK-8, colony formation assay and in vitro angiogenesis experiments after cells were transfected with si-IGF-1. Finally, a mouse eclampsia model induced by knockdown of IGF-1 was established to confirm the in vitro effect of IGF-1 on PE. We found that IGF-1, ZEB1 and miR-183 were highly expressed in the placental tissues of patients with PE. The knockdown of IGF-1 resulted in reduced proliferation and invasion of trophoblast cells and was accompanied by inhibited angiogenesis. ZEB1 was positively regulated by IGF-1 via ERK/MAPK pathway, which in turn inhibited miR-153 expression by binding to the miR-183 promoter. The in vitro experiments further confirmed that IGF-1 knockdown could induce PE. To sum up, IGF-1 knockdown elevated expression of miR-183 by downregulating ZEB1, thereby promoting deterioration of PE.     

Antisense Tiam1 Down-Regulates the Invasiveness of 95D Cells in Vitro

Invasion and metastasis are the main death causes oftumor patients, and aberrant expression of some genescontributes to tumor cell invasion and metastasis [1]. Tiam1was firstly identified as a gene amplified by insertedretrovirus which can confer metastat…     

LINC00472 suppressed by ZEB1 regulates the miR-23a-3p/FOXO3/BID axis to inhibit the progression of pancreatic cancer

The tumour-suppressive role of LINC00472 has been extensively reported in various human cancers such as lung, colon and ovarian cancers, yet its function in pancreatic cancer remains unidentified. Here, the current research aimed to explore the role and regulatory axis mediated by LINC00472 in the progression of pancreatic cancer. RT-qPCR was adopted to determine LINC00472 expression in the harvested pancreatic cancer tissues and adjacent normal tissues. Loss-of-function and gain-of-function experiments were performed to examine the effects of LINC00472 on proliferation and apoptosis in vitro and tumorigenesis in vivo. Immunoblotting was performed to detect the expression of several proliferation and apoptosis-related proteins. Bioinformatic analysis, dual-luciferase reporter assay and RNA pull-down were conducted to profile the relationships between LINC00472 and miR-23a-3p, between miR-23a-3p and FOXO3 and between FOXO3 and BID. The LINC00472 expression was down-regulated by ZEB1 in the pancreatic cancer cells and tissues. LINC00472 could competitively bind to miR-23a-3p to enhance the expression of FOXO3, which consequently could promote the BID expression, thereby suppressing proliferation and promoting the apoptosis of pancreatic cancer cells. Meanwhile, the inhibitory role of LINC00472 in tumorigenesis was validated in vivo, and the LINC00472-mediated miR-23a-3p/FOXO3/BID axis was also demonstrated in the nude mouse tumour formation model. The study substantiated the antitumour activity of LINC00472 in pancreatic cancer and proposed a regulatory axis in which LINC00472 competitively binds to miR-23a-3p to enhance the FOXO3 expression and promote BID expression. Consequently, these findings provide theoretical basis for developing potential targets for the treatment of pancreatic cancer.     

敲低脑内皮细胞粘附分子抑制HNSC细胞的侵袭能力

转移是包含头颈部鳞状细胞癌（head-and-neck squamous cell carcinoma, HNSC）在内的多种肿瘤复发和患者死亡的主要原因。目前,关于HNSC转移的网络调控机制仍有待进一步完善,以期降低HNSC死亡率。首先,通过在线数据库GEPIA统计后发现,脑内皮细胞粘附分子（cerebral endothelial cell adhesion molecule, CERCAM）在519例头颈部肿瘤中的相对表达量为4.98,是其在44例正常组织中（相对表达量为2.47）表达量的2.02倍。并且发现CERCAM表达量与头颈部肿瘤患者较差的预后正相关（P=0.015）。其次,在舌癌细胞SCC-9、喉癌细胞HEP2和鼻咽癌细胞CNE2敲低CERCAM的表达,发现上述3种细胞的侵袭能力均较对照组分别下降93.60%、37.18%和40.63%。最后,生物信息学预测结合Western印迹的结果证实,敲低CERCAM后,上调E-钙黏蛋白（E-cadherin）,同时下调锌指E盒结合蛋白(zinc-finger E-box-binding homeobox1, ZEB1)、波形蛋白(vimentin)和Twist相关蛋白1（Twist-related protein 1, TWIST1）。结果证实,CERCAM可能通过调控头颈部肿瘤细胞的上皮间充质转化（epithelial-mesenchymal transition, EMT）标志物来促进该类细胞发生侵袭。     

SKP2 regulates ZEB1 expression and stimulates eutopic endometrial stromal cell invasion and proliferation of adenomyosis

Though endometriosis is benign, however, it shares certain characteristics with cancers, such as the ability to invade and metastasize. Previous studies have demonstrated that S-phase kinase associated protein2 (SKP2) promotes invasion, tumorigenesis, and metastasis. However, its correlation with adenomyosis is unclear. Herein, we aimed to look into SKP2 expression patterns and regulatory effects on endometrial stromal cell (ESC) proliferation and invasion, and its internal mechanism in adenomyosis. Western blot, qRT-PCR, and immunochemistry were carried out for detecting SKP2 and ZEB1 expression in ESC of adenomyosis and adenomyosis endometrial tissue. The primary ESCs were identified using immunofluorescence. SKP2 knockdown was accomplished in vitro by transfecting a particular lentivirus vector. The colony formation and CCK-8 assays were carried out for assessing cell proliferation, while cell invasion potential was assessed using the transwell assay. Both SKP2 and ZEB1 were found to be significantly upregulated in adenomyosis endometrial tissue. Knockdown of SKP2 inhibited adenomyotic ESC invasion and proliferation. Further experiments showed that knocking out SKP2 reduced ZEB1 expression in adenomyotic ESCs. Our results showed that SKP2 could regulate ZEB1 expression, and increased SKP2 may play a role in the pathogenesis of adenomyosis and stimulating ESC proliferation and invasion.     

Stem cell-based modeling and single-cell multiomics reveal gene-regulatory mechanisms underlying human skeletal development

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