基质金属蛋酶与胃癌侵袭和转移

胃肠道恶性肿瘤的发生和演化是多因素参与、多步骤的进程，在其侵袭和转移过程时，基质金属蛋白酶（ＭＭＰ）起重要作用。ＭＭＰ在胃癌侵袭和转移中起重要作用，有可能成为判断胃癌生物学行为的重要指标。ＭＭＰ人工合成抑制剂的开发可能成为胃癌辅助治疗的手段。     

基质金属蛋白酶与胃癌侵袭和转移

胃肠道恶性肿瘤的发生和演化是多因素参与、多步骤的进程 ,在其侵袭和转移过程时 ,基质金属蛋白酶 (MMP)起重要作用。MMP在胃癌侵袭和转移中起重要作用 ,有可能成为判断胃癌生物学行为的重要指标。MMP人工合成抑制剂的开发可能成为胃癌辅助治疗的手段。     

双氢青蒿素抑制胶质瘤干细胞侵袭迁移的机制

BACKGROUND: Dihydroartmisinin can promote apoptosis of glioma cells GL261, but its effect on glioma stem cells is still unknown.OBJECTIVE: To investigate the preliminary mechanism that dihydroartemisinin inhibits migration and invasion of glioma stem cells.METHODS:Glioma stem cells were isolated from mouse malignant glioma cell lines GL261. Immunofluorescence analysis was conducted to identify the characteristics of glioma stem cells. Migration and invasion abilities of glioma stem cells were analyzed by Transwell assay. The mRNA expressions of Toll-like receptor 2, matrix metalloproteinase-2 and matrix metalloproteinase-9 were examined by real-time fluorescence quantitative PCR.RESULTS AND CONCLUSION: The characteristics of glioma stem cells were identified by CD133 and Nestin staining. The migration and invasion of glioma stem cells were attenuated by dihydroartemisinin dose-dependently. Moreover, the mRNA expression of Toll-like receptor 2, matrix metalloproteinase-2 and matrix metalloproteinase-9 was also decreased by dihydroartemisinin in a dose dependent manner. These results suggest that dihydroartemisinin inhibits the migration and invasion of glioma stem cells probably through attenuation of Toll-like receptor signaling pathway.  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     

基质金属蛋白酶MMP—2，MMP—9与肺癌的侵袭和转移

基质金属蛋白酶MMP 2和MMP 9是降解Ⅳ型胶原最主要的酶 ,在肺癌的侵袭转移中起重要作用。MMPs在各型肺癌中的表达均有明显增加 ,MMP 2 ,MMP 9的表达水平与肺癌预后具相关性。目前开发合成的数种MMP抑制剂已进入临床实验阶段     

基质金属蛋白酶与肿瘤侵袭和转移

基质金属蛋白酶与肿瘤侵袭和转移高庆吴秉铨从原位的增殖性肿瘤到侵袭转移癌的演进过程中，肿瘤细胞必须具备降解细胞外基质的能力。细胞外基质的降解主要依靠蛋白水解酶。基质金属蛋白酶（ｍａｔｒｉｘｍｅｔａｌｏｐｒｏｔｅｉｎａｓｅ，ＭＭＰ）是四类蛋白水解酶：丝氨...     

褪黑素抑制胃癌细胞系SGC-7901的迁移和侵袭

目的 探讨褪黑素(MLT)对胃癌细胞迁移和侵袭的抑制作用及其分子机制。 方法 不同浓度(0.1、1、2 和4 mmol/L)的褪黑素干预人胃癌SGC-7901 细胞 24 h,应用划痕实验、Transwell小室法检测胃癌细胞迁移和侵袭能力的改变;ELISA试剂盒检测培养液上清中基质金属蛋白酶（MMP）-2、MMP-9的表达,Real-time PCR检测胃癌细胞MMP-2、MMP-9、细胞间黏附分子1(ICAM-1）和CD44基因表达;免疫印迹法检测ICAM-1、CD44、p-P38、P38和磷酸化丝裂原活化蛋白激酶激酶（p-MKK）3/6蛋白表达。 结果 褪黑素抑制胃癌细胞的迁移和侵袭,并呈剂量依赖性。与空白对照组比较,褪黑素降低胃癌细胞基质金属蛋白酶（MMP)-2、MMP-9和ICAM-1、CD44的表达,并抑制p-P38、P38和p-MKK3/6的表达。 结论 褪黑素通过抑制胃癌细胞MMP-2、MMP-9、ICAM-1和CD44的表达从而抑制胃癌细胞的迁移和侵袭能力,抑制作用可能与p38MAPK信号通路有关。     

MMP—2和MMP—9在人脑原发性胶质瘤侵袭中的作用

目的 探讨基质金属蛋白酶MMP－2和MMP－9在原发性人脑胶质瘤侵袭行为中的作用。方法 用免疫组织化学S－P法检测MMP－2和MMP－9在胶质瘤和脑内转移瘤中的表达情况;同时通过测量CT影像上的瘤周水肿范围,并与免疫组织化学表达结果作对照比较。结果 1.45例人脑胶质瘤档本中,MMP－2和MMP－9的瘤细胞阳性率分别为35.5%、62.2%,两者之间差别显著（P＜0.05）;MMP－2、MMP－9在高度恶性胶质瘤标本中阳性率分别为56.5%、91.3%,两者之间亦存在明显差别（P＜0.01）;2.MMP－2的染色强度与胶质瘤侵袭指标－－CT瘤周水肿范围无关（P＞0.05）,而MMP－9的染色强度则与其有关（P＜0.05）;也与高度恶性胶质瘤中的表达率无统计学差别（P＞0.05）。结论 MMP－2、MMP－9在人脑胶质瘤中可以作为恶性表型及侵袭指标之一,亦可体现胶质瘤基质降解表型,但不能作为转移表型。其中,MMP－9在人脑胶质瘤侵袭中可能发挥着更重要的作用。     

Nestin差异表达对脑胶质瘤细胞迁移与侵袭的影响

目的： 探讨nestin差异表达对脑胶质瘤细胞迁移与侵袭能力的影响。方法: Transwell实验检测细胞的迁移与侵袭能力;细胞免疫荧光观察细胞nestin的表达;Western blotting对比分析细胞nestin和MMP-2的表达。结果: SWO-38细胞的迁移能力大大低于U251细胞,差异显著(P<0.05),而两者侵袭能力无明显差别。细胞免疫荧光结果显示,SWO-38细胞的nestin均匀分布在细胞浆,呈丝状着色;而U251细胞的nestin强表达于核周,并向胞浆放射状分布。Western blotting结果显示两株细胞nestin的分子量存在差异。而SWO-38细胞的MMP-2表达水平则高于U251细胞,显示SWO-38细胞有更强的酶解细胞外基质的能力。结论: 脑胶质瘤细胞的迁移能力与nestin的差异表达存在相关性,而侵袭能力与MMP-2相关。迁移能力与酶解细胞外基质能力的结合决定了肿瘤的侵袭能力。     

体外共培养人骨髓间充质干细胞与乳腺癌细胞可促进癌细胞的侵袭和迁移能力

目的探讨人骨髓间充质干细胞(h BM-MSCs)与乳腺癌细胞共培养对癌细胞转移能力的影响。方法 ELISA检测BM-MSCs分泌细胞因子的水平。Transwell小室将BM-MSCs与乳腺癌细胞系MCF-7和MDB-MA-231分别共培养,比较共培养前后乳腺癌细胞的侵袭和迁移能力。Western blot检测p-STAT3和p-ERK等信号通路的激活情况。实时定量RT-PCR检测侵袭转移相关基因MMP-2和MMP-9的表达水平。结果 BM-MSCs分泌大量的细胞因子HGF、IL-6、VEGF和TGF-β1。与BM-MSCs共培养后,乳腺癌细胞MCF-7(P0.01)和MDB-MA-231(迁移P0.05,侵袭P0.01)迁移和侵袭能力显著增加,p-STAT3和p-ERK信号通路激活(P0.01),侵袭转移相关靶基因MMP-2和MMP-9表达水平上调(P0.01)。结论 BM-MSCs与乳腺癌细胞共培养可以促进乳腺癌细胞的迁移和侵袭。     

川楝素通过MMP9抑制肾癌细胞的增殖、迁移和侵袭

目的：基于网络药理学方法探讨川楝素治疗肾癌的靶点及作用机制，并通过体外内实验进行验证。方法：通过SwissTarget数据库和TargetNet数据库获取川楝素的作用靶点，GeneCards数据库获取肾癌疾病相关靶点；采用DAVID数据平台对靶点进行GO分析；利用基因表达汇编（GEO）数据库的组织芯片分析靶点基因在肾癌组织的表达水平；基于肿瘤基因组图谱（TCGA）数据库分析靶点基因与肾癌临床表型的关系。采用CCK-8实验及异种移植实验观察川楝素对肾癌细胞体内外增殖的影响；采用Transwell侵袭和迁移实验观察川楝素对肾癌细胞侵袭和迁移的影响；构建基质金属蛋白酶9(MMP9)过表达质粒并转染人肾癌细胞系ACHN和769-P，观察上调MMP9表达对肾癌细胞增殖、侵袭及迁移的影响。结果：基于网络药理学分析结果，川楝素作用于肾癌的靶点包括MMP9在内共有13个靶点；TCGA数据库的临床数据表明，MMP9在肾癌组织中的表达较正常肾组织表达上调（P<0.05），且其高表达与肾癌临床分期晚、分化程度低、复发及预后差密切相关（P<0.05）。功能实验中，川楝素呈时间和剂量依赖性抑制MMP...     

小分子化合物E-039抑制胃癌细胞迁移侵袭及其分子机制

目的研究小分子化合物E-039对人胃癌细胞增殖、迁移侵袭的影响及其分子机制。方法用MTT检测不同浓度小分子化合物E-039对胃癌细胞BGC823和MKN-45增殖能力的影响。分别用0、20、40、60μmol/L浓度的E-039处理BGC823和MKN-45两种胃癌细胞,应用Transwell小室检测其对上述细胞迁移侵袭能力的抑制作用,Western Blot检测化合物对金属基质蛋白酶2(MMP2)表达及丝切蛋白(Cofilin)磷酸化水平的影响。结果化合物E-039对于BGC823和MKN-45两种胃癌细胞的增殖能力无明显影响,却能够以剂量依赖的方式抑制BGC823及MKN-45细胞的迁移和侵袭。Western Blot结果显示E-039下调胃癌细胞BGC823中MMP2的表达及Cofilin的磷酸化水平。结论化合物E-039能够通过下调胃癌细胞中MMP2的表达及Cofilin的磷酸化水平,抑制胃癌细胞BGC823、MKN-45的迁移和侵袭。     

长链非编码RNA母系表达基因3对结直肠癌细胞侵袭和迁移能力的影响

目的:检测长链非编码RNA母系表达基因3(maternally expressed gene 3,MEG3)在结直肠癌细胞中的表达,并观察过表达MEG3对结直肠癌细胞侵袭和迁移能力的影响。方法:检测人正常结肠细胞NCM460及结直肠癌细胞SW48、Lo Vo中MEG3的水平,在SW48细胞和Lo Vo细胞中转染MEG3过表达质粒,利用Transwell小室及划痕实验观察过表达MEG3对细胞侵袭和迁移能力的影响,通过Western blotting检测基质金属蛋白酶(matrix metalloproteinase,MMP)家族相关蛋白的变化。结果:结直肠癌细胞SW48和Lo Vo中MEG3的水平明显低于人正常结肠细胞NCM460;在SW48和Lo Vo细胞中过表达MEG3后能够明显抑制细胞的侵袭和迁移能力;Transwell侵袭实验和迁移实验显示MEG3表达组SW48细胞的穿膜数及Lo Vo细胞的穿膜数与对照组比较明显减少。划痕实验中过表达MEG3后细胞间距较对照组明显增大,提示细胞运动能力减弱。同时过表达MEG3可明显降低细胞中MMP-2及MMP-9的表达,增高金属蛋白酶组织抑制物2(tissue inhibitor of metalloproteinase-2,TIMP-2)的表达。结论:结直肠癌细胞中MEG3水平较正常结直肠细胞明显降低;在结直肠癌中过表达MEG3可抑制细胞的侵袭、迁移运动能力,并且可能通过影响TIMP-2、MMP-2及MMP-9的表达发挥上述功能。     

PXMP4促进结直肠癌细胞增殖、迁移和侵袭

目的 探讨过氧化物酶体膜蛋白4(peroxisomal membrane protein 4,PXMP4)对结直肠癌细胞增殖、迁移和侵袭能力的影响.方法 采用生物信息学分析65例配对结直肠癌组织中PXMP4 mRNA的表达.应用免疫组化检测112例配对结直肠癌组织中PXMP4的表达,并进行临床病理相关分析;利用RT-P...     

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。     

Integrin subunit alpha V promotes growth,migration, and invasion of gastric cancer cells

Integrin subunit alpha V (ITGAV), a member of integrin family of extracellular matrix receptors, is involved in many types of cancer. In this study, the expression levels, clinical features and prognosis of ITGAV in gastric cancer (GC) patients were investigated, and the functional roles of ITGAV were also investigated. Cell Counting Kit-8 (CCK-8) assay was performed to examine the proliferation of GC cells. Transwell assays and wound-healing assays were conducted to explore the effect of ITGAV expression on GC cell migration and invasion. We found that ITGAV was overexpressed in both GC tissues and GC cells. ITGAV expression was positively correlated with lymph node metastasis and TNM stage of GC. High expression of ITGAV was associated with shorter overall survival (OS) and disease-free survival (DFS). Interestingly, the downregulation of ITGAV resulted in suppression of proliferation, migration, and invasion in GC cells. In conclusion, ITGAV is overexpressed in gastric cancer and is associated with poorer prognostic outcomes. ITGAV may serve as an important prognostic marker for GC staging and progression.     

Knockdown of TFPI-2 promotes migration and invasion of glioma cells

Glioblastoma is the most malignant primary brain tumor. Due to its highly promigratory and proinvasive properties, standard therapy including surgery, chemotherapy and radiation fails in eradicating this highly aggressive type of cancer. Here, we evaluated the role of TFPI-2, a Kunitz-type serine protease inhibitor, which has been previously described as a tumor suppressor gene in several types of cancer, including glioma. TFPI-2 expression was absent in five of nine investigated high-grade glioma cell lines. Lentiviral knockdown of TFPI-2 in two of the TFPI-2-expressing cell lines (MZ-18 and Hs 638) was associated with pronounced changes in the cellular behavior: glioma cell proliferation, migration and invasion were significantly increased in TFPI-2 knockdown cells in comparison to empty vector-transfected control cells. Since TFPI-2 might exert its tumor suppressor function by inhibiting MMPs, we subsequently analyzed the effects of specific MMP inhibitors on cell invasion of TFPI-2 KD cells vs. control cells. The data obtained from these experiments suggest that the anti-invasive properties of TFPI-2 are associated with inhibition of MMP-1 and MMP-2, while inhibition of MMP-9 seems to play a minor role in this context. Our findings underscore the important role of TFPI-2 as a tumor suppressor gene and indicate that TFPI-2 may be a useful diagnostic marker for the aggressive phenotype of glial tumors.     

纺锤菌素抑制胃癌细胞的侵袭和转移

目的探讨纺锤菌素(netropsin)对胃癌细胞侵袭和转移能力的影响及其分子机制。方法用Transwell检测胃癌细胞侵袭和转移能力,用Western blot检测EMT相关标志物E-cadherin和vimentin表达,用免疫荧光检测β-catenin的细胞定位,验证netropsin作用前后Wnt/β-catenin信号通路活性。结果 Netropsin浓度25μmol/L时对MKN28细胞增殖有抑制作用,netropsin可以降低上皮标志物E-cadherin的表达,上调间质标志物vimentin的表达;netropsin可以通过抑制胃癌细胞的EMT,降低胃癌细胞侵袭和转移能力(P0.05),同时可阻止β-catenin进入细胞核。结论 Netropsin可以通过与HMGA2竞争结合转录因子结合位点抑制Wnt/β-catenin信号通路,降低胃癌细胞EMT的发生,从而抑制胃癌细胞侵袭能力。     

转染胃动蛋白2基因抑制人胃癌细胞系MKN28增殖、迁移和侵袭

目的检测胃癌、癌旁组织和胃癌远端胃黏膜组织中胃动蛋白2(GKN2)的表达;分析GKN2转染人胃癌MKN28细胞系后对增殖、迁移和侵袭的影响。方法免疫组织化学技术检测胃癌、癌旁组织和胃癌远端胃黏膜中GKN2蛋白的表达;将GKN2基因真核表达载体(Xhol_GKN3SP-h GKN2-TEV-SBP_Xhol)转入人胃癌MKN28细胞,经G418筛选后获得稳转细胞株,Western blot确定GKN2在MKN28细胞中表达;MTT法测定MKN28细胞增殖;Transwell迁移实验和侵袭实验检测细胞迁移和侵袭。结果 GKN2在胃癌组织中的表达少于胃癌远端胃黏膜和癌旁胃组织(P<0.05)。GKN2转染人胃癌MKN28细胞后吸光度值(A值)显著低于未转染组和空载体组(P<0.05)。与未转染组及空载体组相比,GKN2过表达致使迁移细胞数(P<0.05)和侵袭细胞数均明显下调(P<0.05)。结论 GKN2表达减低与胃癌的发生有关;GKN2过表达显然可阻抑人胃癌MKN28细胞的增殖、迁移和侵袭。     

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.