枸杞多糖抑制SMMC-7721肝癌细胞的VEGF表达、迁移与侵袭

目的研究枸杞多糖(lycium barbarum polysaccharide,LBP)对SMMC-7721肝癌细胞迁移、侵袭影响的机制。方法运用MTT法检肝癌细胞SMMC-7721的增殖率,Transwell检测细胞的迁移力和侵袭力,应用血管内皮生长因子(vascular endothelial growth factor,VEGF)小分子干扰RNA沉默VEGF表达,转染pcDNA 3.1-VEGF过表达VEGF,Western blot和qRT-PCR检测VEGF、MMP-2和MMP-9表达。结果 LBP(100、200、400μg/ml)处理可抑制SMMC-7721细胞的增殖、迁移和侵袭,并抑制MMP-2、MMP-9和VEGF表达;沉默VEGF可降低SMMC-7721细胞迁移、侵袭相关蛋白MMP-2和MMP-9水平,过表达VEGF可逆转LBP对SMMC-7721细胞迁移和侵袭相关蛋白MMP-2和MMP-9水平的抑制作用。结论枸杞多糖可抑制肝癌细胞的迁移和侵袭,其机制可能与直接抑制VEGF有关。     

GALNT14对人乳腺癌MCF-7细胞迁移的影响

构建真核表达载体pcDNA 3.1-Flag-T14,重组质粒经酶切分析及测序鉴定后,利用脂质体将重组质粒转染人乳腺癌细胞系MCF-7细胞,经G418筛选并建立稳定转染GALNT14细胞株.应用半定量RT-PCR、Western blot检测稳定细胞株GALNT14 mRNA及蛋白表达水平,细胞划痕修复及穿膜试验检测GALNT14基因对MCF-7迁移能力的影响,同时RT-PCR检测GALNT14对MMP-2,MMP-9,TGF-β1及VEGF等肿瘤浸润转移相关因子表达的影响.结果显示成功构建了真核重组表达载体pcDNA 3.1-Flag-T14,经RT-PCR和Western blot检测显示成功获得了稳定表达GALNT14的MCF-7细胞株;GALNT14能够提高MCF-7细胞株的迁移能力,且能增加侵袭转移相关因子MMP-2,MMP-9,TGF-β1及VEGF的表达.结论:GALNT14可明显促进MCF-7细胞的迁移,可能在肿瘤侵袭转移中起重要作用.     

长链非编码RNA LINC00885在人食管癌细胞中的作用研究

探讨长链非编码RNA LINC00885对人食管癌细胞EC109增殖、迁移与侵袭的影响。构建LINC00885基因过表达质粒（pcDNA3.1-LINC00885）和shRNA敲低质粒（pLKO.1-LINC00885）。分别采用集落形成实验检测EC109细胞增殖能力;划痕实验检测EC109细胞横向迁移能力;Transwell实验检测EC109细胞纵向迁移能力及侵袭能力;流式实验检测LINC00885对于细胞周期的调控;实时定量PCR方法检测LINC00885 mRNA转录水平;Western blot检测BMP7及上皮间充质转化（epithelial-to-mesenchymal transition,EMT）通路相关蛋白（VIMENTIN、β-catenim和ZO-1）表达水平。在过表达LINC00885的EC109细胞中,细胞的增殖能力、迁移能力及侵袭能力均显著增强,BMP7蛋白表达升高;而在敲低表达LINC00885的EC109细胞中,细胞的增殖能力、迁移能力与侵袭能力均显著降低,BMP7蛋白表达也随之降低。另外,在过表达LINC00885的EC109细胞中,EMT通路蛋白VIMENTIN、β-catenim表达水平显著升高,而ZO-1表达水平显著降低。通过探究LINC00885对食管癌细胞增殖、迁移能力的影响,旨在验证LINC00885在食管癌中的功能,以期为临床治疗食管癌奠定理论基础。     

沉默胃泌素基因抑制胃癌细胞的增殖、迁移和侵袭

胃癌细胞分泌的胃泌素与胃癌的发生、发展密切相关.为了探讨胃泌素对胃癌细胞增殖、迁移和侵袭的影响,本文构建靶向胃泌素基因的siRNA表达载体, 转染胃癌细胞AGS, 成功获得沉默胃泌素基因的稳转胃癌细胞株AGS/Gas-siRNA. 用MTT实验、软琼脂集落形成实验、细胞伤愈实验、Transwell实验及ELISA检测沉默胃泌素基因后细胞的增殖、迁移、侵袭及转移相关蛋白基质金属蛋白酶-2（MMP-2）和血管内皮生长因子（VEGF）的含量. 结果显示: 与空载体转染的对照细胞比较, 沉默胃泌素基因的细胞, 其增殖率和克隆形成率显著降低,迁移和侵袭到Transwell下室的细胞数分别降低了31.6 %和34 %. 培养上清液中MMP-2和VEGF含量也低于对照细胞. 结果提示,沉默胃泌素基因的胃癌细胞,通过降低MMP 2和VEGF分泌,抑制了细胞的增殖、迁移和侵袭, 这可能是胃泌素促进胃癌侵袭转移的机制之一.     

TGF-β1促进人子宫颈癌细胞Siha的侵袭、迁移及其机制研究

探讨转化生长因子-β1(TGF-β1)对人子宫颈癌细胞Siha侵袭、迁移能力的影响及其可能的分子机制。用5 ng/m L TGF-β1作用Siha细胞72 h,通过倒置显微镜、CCK-8实验、单细胞克隆形成实验、细胞黏附实验和Transwell小室实验分别观察TGF-β1作用前后Siha细胞形态、增殖能力、克隆形成能力、黏附能力、迁移及侵袭能力的改变;Western blot检测TGF-β1作用前后基质金属蛋白酶-2(MMP-2)、MMP-9、VEGF、CFTR、P50、P65、E-cadherin及Vimentin蛋白表达的变化。结果表明,5 ng/m L TGF-β1作用Siha细胞72 h后,Siha细胞出现上皮细胞向间质细胞形态转变、黏附能力减弱、迁移和侵袭能力增强,伴随MMP-2、MMP-9、VEGF、CFTR、P50、P65和Vimentin表达上调,E-cadherin表达下调。该研究表明,TGF-β1可能通过诱导Siha细胞发生上皮–间质转化及上调MMP-2、MMP-9和VEGF的表达,促进Siha细胞的侵袭转移。     

生物钟基因PER2在人口腔鳞癌细胞中具有重要的抑癌作用

探讨生物钟基因PER2对人口腔鳞癌SCC9细胞增殖、凋亡、迁移和侵袭的影响和机理。利用RNA干扰技术沉默SCC9细胞中PER2基因,应用实时荧光定量PCR检测Ki-67、MDM2、P53、Bcl-2、Bax、C-myc、MMP-2、Timp-2和VEGFm RNA的表达改变;流式细胞仪检测沉默后细胞的增殖和凋亡水平,平板克隆形成实验检测细胞的克隆形成率,Transwell小室检测细胞迁移和侵袭能力的改变。沉默PER2基因后,SCC9细胞凋亡指数显著降低(p0.05),细胞增殖指数、细胞迁移和侵袭能力显著升高(均p0.05)。PER2沉默后Ki-67、MDM2、Bcl-2、C-myc、MMP-2和VEGF m RNA的表达水平显著升高(均p0.05),p53、Bax和Timp-2 m RNA的表达水平显著降低(均p0.05)。研究表明,生物钟基因PER2通过调控Ki-67、MDM2、P53、Bcl-2、Bax、C-myc、MMP-2、Timp-2和VEGF影响癌细胞的增殖、凋亡、迁移和侵袭。因此,对PER2的深入研究有可能为癌症的治疗提供新的有效分子靶点。     

血清应答因子在食管鳞癌细胞侵袭转移中的作用

目的:研究血清应答因子(serum response factor,SRF)在人食管鳞癌细胞体外侵袭转移中的意义。方法:选用EC9706-H、EC9706-L和EC109-H、EC109-L两对高低转移细胞系,采用细胞划痕实验验证食管鳞癌高低转移细胞系体外侵袭转移能力的差异;Western blot检测SRF在两对食管鳞癌高低转移细胞系中的差异表达;在EC9706-H、EC109-H细胞中加入CCG(SRF抑制剂)抑制SRF的表达后,检测其侵袭转移能力的变化。结果:细胞划痕实验验证了两对食管鳞癌高低转移细胞系侵袭转移能力的差异;Western blot结果提示SRF在EC9706-H、EC109-H细胞中的表达水平显著高于EC9706-L、EC109-L细胞;在EC9706-H、EC109-H细胞中加入CCG抑制SRF的表达后,其侵袭转移能力明显减退。结论:SRF在高转移性食管鳞癌细胞系中呈现高表达,在低转移性食管鳞癌细胞系中呈现低表达,抑制高转移性食管鳞癌细胞系中SRF的表达后,其侵袭转移能力下降,提示SRF和食管鳞癌的侵袭转移能力呈正相关。     

高转移潜力食管癌细胞株的建立及其生物学特征

目的建立具有高转移潜力食管癌细胞株并研究其生物学特征。方法将食管癌细胞系EC109细胞悬液异位移植到SCID小鼠胃壁,约3个月后或动物濒临死亡时处死,行病理学解剖,将肉眼可见的纵隔淋巴结转移瘤块接种于SCID鼠皮下扩增,然后取小鼠皮下瘤组织块进行细胞培养,得到性状稳定的细胞株NMC109后,用MTT法分析细胞生长曲线,Western bloting法检测与细胞分裂增殖能力密切相关的TopoⅡα表达,酶谱法检测MMP-2和MMP-9的活性,划痕实验和Transwell体外移动实验检测细胞的移动能力。结果与母本细胞EC109相比,所获得的细胞株NMC109其增殖能力和TopoⅡα表达明显增强,MMP-9的活性明显升高,移动能力明显增强。结论获得了具有高转移潜力的食管癌细胞株。     

Galectin-7对食管鳞癌细胞株Eca-109迁移、侵袭的影响及其机制

为了探讨半乳糖凝集素-7(Galectin-7)在食管癌Eca-109细胞发生发展中的细胞外功能及其机制,该实验采用免疫印迹法检测浓缩细胞上清液中Galectin-7的表达,并利用不同浓度的重组Galectin-7培养食管癌Eca-109细胞。使用免疫印迹、实时荧光定量PCR、细胞划痕实验、MTT实验检测在培养后细胞中基质金属酶-9(MMP-9)、p38、pp38表达水平的变化以及Eca-109细胞迁移和增殖能力的改变。结果显示,Galectin-7存在于Eca-109细胞细胞上清液中,加入重组Galectin-7培养细胞后,MMP-9、pp38的表达水平明显上升,并且细胞的迁移能力也得到了提高,增殖能力无明显变化。由此说明,在食管癌Eca-109细胞中,Galectin-7可以被细胞分泌至细胞外,可能通过结合细胞外膜上特异性糖基配体激活p38 MAPK通路诱导MMP-9的表达,从而在Eca-109细胞侵袭、迁移过程中发挥重要的作用。     

海参多糖抑制人肾癌细胞A498的生长转移作用机制

肾细胞癌(RCC)是最常见的恶性癌之一,癌症转移是目前导致肾癌患者死亡的主要原因之一。MMP-9被发现在许多具有侵袭性和转移能力的人类癌症中过表达,其表达和分泌受到NF-κB调控;VEGF在维持原发性癌和转移瘤生长所需的血管生成中发挥重要作用,其表达也受到活化的NF-κB调节。海参的多种活性物质在抗氧化、抗菌和抗癌方面都有出色的作用,而抗癌的主要机制则包括诱导癌细胞凋亡、抑制癌细胞生长、减少癌细胞转移等。本研究通过利用不同浓度的海参多糖处理人肾癌细胞A498,采用MTT细胞增殖实验、粘附实验、迁移实验和小室侵袭实验,研究了海参多糖对A498细胞的生长转移的影响;采用蛋白印记法检测了海参多糖对A498细胞内MMP-9、NF-κBp65和VEGF表达水平的影响。结果表明,海参多糖能够显著抑制A498细胞的增殖活力、粘附能力、迁移能力和侵袭能力,并且全都表现出明显的剂量依赖性;中浓度(100μg/mL)和高浓度(200μg/mL)的海参多糖能够显著下调A498细胞内MMP-9、NF-κBp65和VEGF的表达。这些结果说明海参多糖能有效抑制人肾癌细胞A498的生长、转移和侵袭,可能的机制是通过抑制NF-κB信号通路下调MMP-9和VEGF的表达,从而发挥抗癌细胞转移的作用。     

特异性eIF-4EsiRNA重组腺病毒构建及其对人卵巢癌细胞SKOV-3转移相关能力的影响

目的：构建表达真核细胞起始因子-4E（eukaryoticinitiationfactor4E,eIF-4E）特异性siRNA的重组腺病毒载体,观察其对人卵巢癌细胞SKOV-3体外转移能力的影响。方法：应用基因重组技术将eIF．4EsiRNA序列构建于腺病毒载体pLP－Ade－X,经包装细胞包装后得到高滴度重组腺病毒pLP—Ade-4EsiRNA（psiE）。将腺病毒psiE感染SKOV．3细胞,用定量PCR进行elf．4E基因表达检测,然后应用transwell小室法观察对细胞侵袭和运动能力的影响,同时检测感染后细胞内VEGF、MMP－2、MMP－9蛋白表达。结果：病毒检测结果与预期相符,real—timePCR可检测到感染重组腺病毒psiE后SKOV．3细胞没有eIF-4E基因表达;病毒感染后transwell小室法检测到SKOV-3细胞的侵袭和运动能力均受到显著的抑制（均为P〈0．01）;此外病毒感染的SKOV．3细胞中VEGF、MMP-2、MMP-9蛋白表达降低。结论：封闭eIF-4E基因表达对人卵巢癌细胞SKOV．3的侵袭和运动都有抑制作用,其作用机制可能与VEGF、MMP-2、MMP-9表达相关。     

α-Mangostin Suppresses Phorbol 12-myristate 13-acetate-Induced MMP-2/MMP-9 Expressions via αvβ3 Integrin/FAK/ERK and NF-κB Signaling Pathway in Human Lung Adenocarcinoma A549 Cells

The purpose of this study is to investigate the anti-metastatic effect of α-mangostin on phorbol 12-myristate 13-acetate (PMA)-induced matrix metalloproteinase-2 (MMP-2) and matrix metalloproteinase-9 (MMP-9) expressions in A549 human lung adenocarcinoma cells. Firstly, α-mangostin could inhibit PMA-induced abilities of the adhesion, invasion, and migration. Data also showed α-mangostin could inhibit the activation of αvβ3 integrin, focal adhesion kinase (FAK), and extracellular signal-regulated kinase1/2 (ERK1/2) involved in the downregulation the enzyme activities, protein and messenger RNA levels of MMP-2 and MMP-9 induced by PMA. Next, α-mangostin also strongly inhibited PMA-induced degradation of inhibitor of kappaBα (IκBα) and the nuclear levels of nuclear factor kappa B (NF-κB). Also, a dose-dependent inhibition on the binding abilities of NF-κB by α-mangostin treatment was further observed. Furthermore, reduction of FAK or ERK1/2 phosphorylation by FAK small interfering RNA (FAK siRNA) potentiated the effect of α-mangostin. Finally, the transient transfection of ERK siRNA significantly down-regulated the expressions of MMP-2 and MMP-9 concomitantly with a marked inhibition on cell invasion and migration. Presented results indicated α-mangostin is a novel, effect, anti-metastatic agent that functions by downregulating MMP-2 and MMP-9 gene expressions.     

沉默FOXQ1可逆转SW480细胞的上皮-间质转化

FOXQ1是FOX家族的的重要成员之一,其参与了多种人类肿瘤的上皮间质转化(epithelial- mesenchymal transition,EMT).本研究设计合成了FOXQ1基因的shRNA（short hairpin RNA）,用此转染SW480细胞,通过显微镜观察细胞形态,Transwell小室、细胞黏附试验检测转移能力及黏附能力,以探索FOXQ1与结直肠癌细胞EMT的关系.结果显示,沉默FOXQ1后,SW480细胞顶底极性及细胞间紧密连接增加,侵袭、迁移的细胞数目减少,同种黏附能力增加,异种黏附能力降低.进一步的机制研究表明,沉默FOXQ1基因可以导致SW480细胞的上皮标志因子E-cadherin表达显著增高,而间质细胞标志因子N-cadherin、Vimentin及MMP2表达均降低.以上结果表明,沉默FOXQ1基因可以逆转SW480细胞EMT,其机制可能与E-cadherin的上调和N cadherin、Vimentin、MMP2的下调有关,这为进一步研究FOXQ1在结直肠癌发生发展中的作用提供实验基础.     

Antitumor effects of the flavone chalcone: inhibition of invasion and migration through the FAK/JNK signaling pathway in human gastric adenocarcinoma AGS cells

Chalcones (benzylideneacetophenone) are cancer-preventive food components found in a human diet rich in fruits and vegetables. In this study, we first report the chemopreventive effect of chalcone in human gastric adenocarcinoma cell lines: AGS. The results showed that chalcone could inhibit the abilities of the adhesion, invasion, and migration by cell–matrix adhesion assay, Boyden chamber invasion/migration assay, and wound-healing assay. Molecular data showed that the effect of chalcone in AGS cells might be mediated via sustained inactivation of the phosphorylation of focal adhesion kinase (FAK) and c-Jun N-terminal kinase 1 and 2 (JNK1/2) signal involved in the downregulation of the expressions of matrix metalloproteinase-2 (MMP-2) and matrix metalloproteinase-9 (MMP-9). Next, chalcone-treated AGS cells showed tremendous decrease in the phosphorylation and degradation of inhibitor of kappaBα (IκBα), the nuclear level of NF-κB, and the binding ability of NF-κB to NF-κB response element. Furthermore, treating FAK small interfering RNA (FAK siRNA) and specific inhibitor for JNK (SP600125) to AGS cells could reduce the phosphorylation of JNK1/2 and the activity of MMP-2 and MMP-9. Our results revealed that chalcone significantly inhibited the metastatic ability of AGS cells by reducing MMP-2 and MMP-9 expressions concomitantly with a marked reduction on cell invasion and migration through suppressing and JNK signaling pathways. We suggest that chalcone may offer the application in clinical medicine.     

Simultaneous silencing of VEGF and KSP by siRNA cocktail inhibits proliferation and induces apoptosis of hepatocellular carcinoma Hep3B cells

Background

Vascular endothelial growth factor (VEGF) is involved in the growth of new blood vessels that feed tumors and kinesin spindle protein (KSP) plays a critical role in mitosis involving in cell proliferation. Simultaneous silencing of VEGF and KSP, an attractive and viable approach in cancer, leads on restricting cancer progression. The purpose of this study is to examine the therapeutic potential of dual gene targeted siRNA cocktail on human hepatocellular carcinoma Hep3B cells.

Results

The predesigned siRNAs could inhibit VEGF and KSP at mRNA level. siRNA cocktail showed a further downregulation on KSP mRNA and protein levels compared to KSP-siRNA or VEGF-siRNA, but not on VEGF expression. It also exhibited greater suppression on cell proliferation as well as cell migration or invasion capabilities and induction of apoptosis in Hep3B cells than single siRNA simultaneously. This could be explained by the significant downregulation of Cyclin D1, Bcl-2 and Survivin. However, no sigificant difference in the mRNA and protein levels of ANG2, involving inhibition of angiogenesis was found in HUVECs cultured with supernatant of Hep3B cells treated with siRNA cocktail, compared to that of VEGF-siRNA.

Conclusion

Silencing of VEGF and KSP plays a key role in inhibiting cell proliferation, migration, invasion and inducing apoptosis of Hep3B cells. Simultaneous silencing of VEGF and KSP using siRNA cocktail yields promising results for eradicating hepatocellular carcinoma cells, a new direction for liver cancer treatment.     

Suppression of type 1 Insulin-like growth factor receptor expression by small interfering RNA inhibits A549 human lung cancer cell invasion in vitro and metastasis in xenograft nude mice

Cancer invasion and metastasis, involving a variety of pathological processes andcytophysiological changes,contribute to the high mortality of lung cancer.The type 1 insulin-like growthfactor receptor (IGF-1R),associated with cancer progression and invasion,is a potential anti-invasion andanti-metastasis target in lung cancer.To inhibit the invasive properties of lung cancer cells,we successfullydown-regulated IGF-1R gene expression in A549 human lung cancer cells by small interfering RNA (siRNA)technology,and evaluated its effects on invasion-related gene expression,tumor cell in vitro invasion,andmetastasis in xenograft nude mice.A549 cells transfected with a plasmid expressing hairpin siRNA forIGF-1R showed a significantly decreased IGF-1R expression at the mRNA level as well as the proteinlevel.In biological assays,transfected A549 cells showed a significant reduction of cell-matrix adhesion,migration and invasion.Consistent with these results,we found that down-regulation of IGR-1Rconcomitantly accompanied by a large reduction in invasion-related gene expressions,including MMP-2,MMP-9,u-PA,and IGF-1R specific downstream p-Akt.Direct tail vein injections of plasmid expressinghairpin siRNA for IGF- 1R significantly inhibited the formation of lung metastases in nude mice.Our resultsshowed the therapeutic potential of siRNA as a method for gene therapy in inhibiting lung cancer invasionand metastasis.