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...     

miR-146b-5p promotes VSMC proliferation and migration

Vascular smooth muscle cells (VSMCs) play pivotal roles in the development of vascular diseases. While microRNAs are important in vascular pathologies, a few is known about their functional roles in VSMC phenotypes. We profiled microRNA expression in PDGF-BB treated VSMCs and found microRNA-146b-5p (miR-146b-5p) was upregulated. Inhibition of miR-146b-5p blocked in response to PDGF while reducing VSMC proliferation and migration. These studies implicate miR-146b-5p as necessary for PDGF-induced VSMC phenotype transition. Downstream miR-146b-5p targets modulating VSMC phenotypes will be further identified. Our study will help to understand the role of VSMCs in the pathology of vascular diseases.     

ZSWIM5抑制非小细胞肺癌细胞的增殖、集落形成和迁移能力

目的研究ZSWIM5对非小细胞肺癌细胞的增殖、集落形成和迁移能力的作用。方法通过质粒转染和特异性siRNA干扰实现在非小细胞肺癌细胞系A549和H1299中双向调控ZSWIM5的蛋白表达水平,并应用免疫蛋白印迹验证。运用MTT实验检测ZSWIM5表达水平对肺癌细胞增殖能力的影响;运用集落形成实验检测ZSWIM5表达水平对肺癌细胞集落形成能力的影响;运用划痕实验检测ZSWIM5表达水平对肺癌细胞迁移能力的影响。结果 MTT和克隆形成实验表明,转染ZSWIM5可以抑制肺癌细胞的增殖和集落形成,而特异性干扰ZSWIM5促进细胞的增殖和集落形成。划痕实验表明转染ZSWIM5可以抑制肺癌细胞的迁移,而特异性干扰ZSWIM5促进细胞迁移能力。结论 ZSWIM5抑制非小细胞肺癌细胞的恶性表型,可能在肿瘤演进过程中发挥抑癌作用。     

Cerebral endothelial derived vascular endothelial growth factor promotes the migration but not the proliferation of oligodendrocyte precursor cells in vitro

In gray matter, cerebral endothelium is known to provide trophic support for neighboring cells such as neurons. However, signaling from cerebral endothelium to white matter cells remains to be elucidated. Here, we show that vascular endothelial growth factor (VEGF-A) secreted from cerebral endothelial cells promotes the migration but not the proliferation of oligodendrocyte precursor cells (OPCs). Cultured OPCs were obtained from newborn rat cortex, and treatment with conditioned culture media of cerebral endothelial cells increased the OPC proliferation and migration. Importantly, co-treatment with anti-neutralizing antibody for Flk-1 (VEGF-receptor2) inhibited OPC movement but did not affect OPC propagation. Western blot and flow cytometry analyses confirmed that our cultured cerebral endothelial cells produced VEGF-A and our cultured OPCs expressed Flk-1. Taken together, our current data suggest that cerebral endothelium is supportive for oligodendrocyte lineage cells and VEGF-A may participate in the endothelium–OPC cell–cell signaling. This phenomenon may be important for white matter homeostasis.     

CCR5介导6T-CEM细胞穿过人脑微血管内皮细胞单层能力分析

目的 为进一步研究T细胞在阿尔茨海默病(AD)患者脑内发挥的作用,探讨CCR5在6T-CEM穿过人脑微血管内皮细胞(HBMECs)过程中所发挥的生物学功能.方法 应用免疫荧光和Western blot等技术,集中探讨了HBMECs膜受体CCR5在6T-CEM细胞穿过HBMECs过程中作用.结果 在6T-CEM细胞与HBMECs单层单独孵育过程中,引起HBMECs膜受体CCR5表达变化;HBMECs膜受体CCR5的高表达使6T-CEM细胞穿过HBMECs单层能力增强.结论 HBMECs膜受体CCR5参与了6T-CEM细胞穿过HBMECs单层过程.     

MiR-199a-5p promotes migration and tube formation of human cytomegalovirus-infected endothelial cells through downregulation of SIRT1 and eNOS

Human cytomegalovirus (HCMV) infection has been shown to contribute to vascular disease through the induction of angiogenesis. However, the role of microRNA in angiogenesis induced by HCMV infection remains unclear. The present study was thus designed to explore the potential effect of miR-199a-5p on angiogenesis and to investigate the underlying mechanism in endothelial cells. We found that HCMV infection of endothelial cells (ECs) enhanced expression of miR-199a-5p and reduced the SIRT1 protein level at 24 h postinfection (hpi). Transfection with miR-199a-5p mimics significantly suppressed SIRT1 protein expression and promoted cellular migration and tube formation induced by HCMV infection, which could be reversed by transfection with an miR-199a-5p inhibitor. Furthermore, pretreatment with resveratrol depressed motility and tube formation of HCMV-infected ECs, which could be reversed by SIRT1 siRNA. Finally, overexpression of miR-199a-5p decreased the level of eNOS modulated by SIRT1, an effect repressed by transfection with an miR-199a-5p inhibitor. In summary, HCMV infection of endothelial cells upregulates miR-199a-5p expression and enhances cell migration and tube formation through downregulation of SIRT1/eNOS by miR-199a-5p.     

LINC00205 promotes proliferation,migration and invasion of HCC cells by targeting miR-122-5p

Long non-coding RNAs (lncRNAs) have been identified as crucial regulators in the tumorigenesis and progression of hepatocellular carcinoma (HCC). Recently, long intergenic non-protein coding RNA 205 (LINC00205) has been identified as a prognostic biomarker in HCC. However, the biological role of LINC0205 and its potential molecular mechanism are poorly investigated. Here, we found that the expression of LINC00205 was dramatically up-regulated in HCC tissues compared to adjacent nontumor tissues. Furthermore, the level of LINC00205 in both Hep3B and Huh7 cells was prominently higher than that in normal hepatic cell line LO2. Notably, the high expression of LINC00205 was strongly correlated with tumor size ≥5 cm, venous infiltration and advanced tumor stages. Functionally, LINC00205 knockdown obviously repressed the proliferation, migration and invasion of Hep3B and Huh7 cells in vitro. An inverse correlation between LINC00205 and miR-122-5p was detected in HCC tissues. Interestingly, LINC00205 knockdown increased the level of miR-122-5p in both Hep3B and Huh7 cells. Mechanistically, luciferase reporter assay demonstrated LINC00205 acted as a competing endogenous RNA (ceRNA) by directly interacting with miR-122-5p. More importantly, miR-122-5p overexpression significantly restrained the proliferation, migration and invasion of HCC cells. Collectively, our study provides solid evidence to support the oncogenic role of LINC00205 in HCC, which may be benefit for the improvement of HCC therapy.     

miR-107对人脑微血管内皮细胞增殖、迁移和血管形成能力的影响

目的探讨miR-107对人脑微血管内皮细胞增殖、迁移和血管形成能力的影响。方法miR-107化学模拟物agomir转染人脑微血管内皮细胞,CCK-8细胞活性分析实验和Transwell法分别检测内皮细胞增殖和迁移能力变化,体外血管生成实验检测内皮细胞成管能力的改变。结果内皮细胞转染miR-107化学模拟物agomir显著上调miR-107的表达。与阴性对照组(agomiR-NC组)相比,miR-107过表达组(agomiR-107)内皮细胞增殖和迁移显著减少,体外成管能力显著降低(P0.05)。结论miR-107能够抑制脑微血管内皮细胞增殖、迁移并降低其体外成管能力。     

Periostin promotes migration,proliferation, and differentiation of human periodontal ligament mesenchymal stem cells

Overview: Periostin (POSTN) is critical to bone and dental tissue morphogenesis, postnatal development, and maintenance; however, its roles in tissue repair and regeneration mediated by human periodontal ligament mesenchymal stem cells (PDLSCs) remain unclear. The present study was designed to evaluate the effects of POSTN on hPDLSCs in vitro. Materials and Methods: hPDLSCs were isolated and characterized by their expression of the cell surface markers CD44, CD90, CD105, CD34, and CD45. Next, 100 ng/mL recombinant human POSTN protein (rhPOSTN) was used to stimulate the hPDLSCs. Lentiviral POSTN shRNA was used to knockdown POSTN. The cell counting kit-8 (CCK8) and scratch assay were used to analyze cell proliferation and migration, respectively. Osteogenic differentiation was investigated using an alkaline phosphatase (ALP) activity assay, alizarin staining, and quantitative calcium analysis and related genes/protein expression assays. Results: Isolated hPDLSCs were positive for CD44, CD90, and CD105 and negative for CD34 and CD45. In addition, 100 ng/mL rhPOSTN significantly accelerated scratch closure, and POSTN-knockdown cells presented slower closure at 24 h and 48 h. Furthermore, the integrin inhibitor Cilengitide depressed the scratch closure that was enhanced by POSTN at 24 h. The CCK8 assay showed that 100 ng/mL rhPOSTN promoted hPDLSC proliferation. Moreover, 100 ng/mL rhPOSTN increased the expression of RUNX2, OSX, OPN, OCN, and VEGF and enhanced ALP activity and mineralization. POSTN silencing decreased the expression of RUNX2, OSX, OPN, OCN, and VEGF and inhibited ALP activity and mineralization. Conclusions: POSTN accelerated the migration, proliferation, and osteogenic differentiation of hPDLSCs.     

STC2促进人肝癌细胞HepG2增殖和EMT相关的迁移

目的:探讨斯钙素2(STC2)对人肝癌细胞HepG2增殖、迁移以及上皮-间充质转化(EMT)进程的影响。方法:Western blot法检测不同肝癌细胞株及正常肝细胞株的STC2蛋白表达情况;集落形成实验分析STC2对HepG2细胞增殖的影响,同时进一步采用实时荧光定量PCR及Western blot法检测STC2对cyclin D1等增殖相关基因的表达变化;Transwell实验分析STC2对肝癌细胞HepG2迁移能力的影响,采用实时荧光定量PCR和Western blot法检测过表达和沉默STC2的细胞中EMT分子标志物vimentin和E-cadherin的表达情况。结果:与正常肝细胞系相比,STC2蛋白在肝癌细胞中高表达。集落形成实验结果说明STC2促进HepG2细胞的增殖,同时STC2可以显著影响cyclin D1等增殖相关基因的表达。Transwell实验结果说明STC2增强HepG2细胞的迁移能力,同时显著影响肝癌细胞的EMT过程。结论:STC2能够促进肝癌细胞系HepG2的增殖并且影响增殖相关基因的表达,进一步研究表明STC2能够影响肝癌细胞的EMT过程,促进肝癌细胞的迁移。     

Vascular endothelial growth factor immobilized in collagen scaffold promotes penetration and proliferation of endothelial cells

A key challenge in engineering functional tissues in vitro is the limited transport capacity of oxygen and nutrients into the tissue. Inducing vascularization within engineered tissues is a key strategy to improving their survival in vitro and in vivo. The presence of vascular endothelial growth factor (VEGF) in a three-dimensional porous collagen scaffold may provide a useful strategy to promote vascularization of the engineered tissue in a controlled manner. To this end, we investigated whether immobilized VEGF could promote the invasion and assembly of endothelial cells (ECs) into the collagen scaffolds. We conjugated VEGF onto collagen scaffolds using N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride chemistry, and measured the concentrations of immobilized VEGF in collagen scaffolds by direct VEGF enzyme-linked immunosorbent assay. We demonstrated that immobilized VEGF (relative to soluble VEGF) promoted the penetration and proliferation of ECs in the collagen scaffold, based on results of cell density analysis in histological sections, immunohistochemistry, XTT proliferation assay, glucose consumption and lactate production. Furthermore, we observed increased viability of ECs cultured in scaffolds with immobilized VEGF relative to soluble VEGF. This research demonstrates that immobilization of VEGF is a useful strategy to promote the invasion and proliferation of ECs into a scaffold, which may in turn lead to a vascularized scaffold.     

Mesenchymal stem cells support migration, extracellular matrix invasion, proliferation, and survival of endothelial cells in vitro

We investigated effects of the paracrine factors secreted by human mesenchymal stem cells (hMSCs) on endothelial cell migration, extracellular matrix invasion, proliferation, and survival in vitro. Human mesenchymal stem cells were cultured as a monolayer or as three-dimensional aggregates in hanging drops (hMSC spheroids). We performed analysis of paracrine factors in medium conditioned by a monolayer of hMSCs and hMSC spheroids. Concentrations of vascular endothelial growth factor (VEGF), basic fibroblast growth factor, angiogenin, procathepsin B, interleukin (IL)-11, and bone morphogenic protein 2 were increased 5-20 times in medium conditioned by hMSC spheroids, whereas concentrations of IL-6, IL-8, and monocyte hemoattractant protein-1 were not increased. Concentrations of VEGF and angiogenin in medium conditioned by hMSC spheroids showed a weak dependence on the presence of serum, which allows serum-free conditioned medium with elevated concentrations of angiogenic cytokines to be obtained. Medium conditioned by hMSC spheroids was more effective in stimulation of umbilical vein endothelial cell proliferation, migration, and basement membrane invasion than medium conditioned by a monolayer of hMSCs. This medium also promotes endothelial cell survival in vitro. We suggest that culturing of hMSCs as three-dimensional cellular aggregates provides a method to concentrate proangiogenic factors secreted by hMSCs and allows for reduction of serum concentration in conditioned medium. Our data support the hypothesis that hMSCs serve as trophic mediators for endothelial cells. Disclosure of potential conflicts of interest is found at the end of this article.     

MiR-141增强人血管内皮细胞增殖及迁移能力

目的 研究microRNA对血管内皮细胞增殖及迁移能力的影响,以阐明microRNA在血管新生过程中发挥作用的分子机制。方法 用microRNA的反义寡核苷酸序列封闭microRNA的功能后,用四甲基氮唑蓝微量酶反应比色法（MTT）进行筛查,分析血管内皮细胞增殖活性。随后封闭或过表达这些microRNA后,用MTT、集落形成和迁移实验检测细胞的增殖和迁移能力。结果 有7种microRNAs对血管内皮细胞的生长有促进作用。其中封闭miR-141的功能后,细胞生长受抑制最明显,且集落形成能力和细胞迁移能力也明显下降。相反,过表达miR-141后,细胞增殖和迁移能力明显增强。结论 miR-141能够增强血管内皮细胞的增殖和迁移能力,起到促进血管新生的作用。     

低氧增加人皮肤微血管内皮细胞系迁移并促进凋亡

目的研究低氧环境对人皮肤微血管内皮细胞(HDMEC)迁移、凋亡及相关因子HIF-1α、VEGF、i NOS基因及蛋白表达的影响。方法低氧培养人微血管内皮细胞,分为常氧组(对照组)和低氧组(Co Cl2模拟化学低氧)。CCK-8细胞生存实验确定合适处理浓度(200μmol/L Co Cl2),划痕实验检测细胞迁移能力,流式细胞技术观察细胞凋亡;用RT-PCR和Western blot技术检测HIF-1α、VEGF、i NOS mRNA和蛋白表达。结果与常氧组比较,低氧组细胞迁移能力增加(P0.05),凋亡增多(P0.05),均呈时间依赖性。低氧组HIF-1α、HIF-1β、VEGF、i NOS mRNA表达较常氧组比较均增加(P0.05),HIF-1α、VEGF、i NOS蛋白表达较常氧组比较均增加(P0.05),具有一定时间依赖性。结论低氧能增强人皮肤微血管内皮细胞迁移能力,并促进其细胞凋亡,其可能机制与HIF-1α、VEGF、i NOS蛋白表达升高有关。     

RAC1 overexpression promotes the proliferation,migration and epithelial-mesenchymal transition of lens epithelial cells

Cataract is a main cause of blindness worldwide. RAC1 has been reported to have a close relationship with the proliferation and migration of cells. However, the relationship between RAC1 and cataract is not yet clear. The proliferation and migration of lens epithelial cells are key factors in the formation of cataract as well as in the complication of cataract surgery. In this study, the effect of RAC1 overexpression on the proliferation and migration of lens epithelial cells was explored. Results showed that RAC1 overexpression promoted the proliferation of lens epithelial cells and increased the protein level of proliferating cell nuclear antigen. RAC1 overexpression also promoted migration and invasion of lens epithelial cells and had an influence on the epithelial-mesenchymal transition process. These results indicate that RAC1 may become a therapeutic target of cataract and inhibition of RAC1 may become a promising way for the therapy of cataract.     

CD44促进HUVECs增殖和黏附

目的研究CD44在血管内皮细胞增殖和黏附中的作用及机制。方法采用pc DNA3.1载体上调人脐静脉血管内皮细胞(HUVECs)中CD44的表达。使用siRNA分别沉默HUVEC中Akt和血小板内皮细胞黏附因子(PECAM1)基因。MTT法测定细胞增殖,细胞计数法测定细胞黏附率,RT-PCR分析PECAM1的mRNA水平,Western blot分析蛋白Ki67、PECAM1以及Akt磷酸化水平。结果 CD44过表达显著促进了HUVEC的增殖(P0.05),上调Ki67的表达并促进Akt的磷酸化(P0.05);Akt siRNA显著降低了CD44诱导的细胞增殖(P0.05)。CD44促进HUVEC细胞间黏附(P0.05),上调PECAM1的mRNA和蛋白水平(P0.05);PECAM1 siRNA降低CD44诱导的细胞黏附(P0.05)。结论 CD44能够促进HUVEC的增殖和黏附,部分作用可能与上调PECAM1有关。     

吡格列酮促进大鼠骨髓内皮祖细胞的增殖

背景：内皮祖细胞具有增殖、迁移和分化为内皮细胞的特征,对冠状动脉硬化性心脏病及糖尿病心血管并发症的发生、发展可能起着重要作用。 目的：探讨选择性过氧化物酶体增殖物激活受体γ激动剂吡格列酮对大鼠骨髓内皮祖细胞增殖的影响及相关机制。 方法：①采用密度梯度离心法和差速贴壁法培养大鼠骨髓内皮祖细胞,置于含0,1,10,50,100,200 μmol/L吡格列酮的培养基中培养,观察吡格列酮促进内皮祖细胞增殖的最佳浓度。②将培养7 d的内皮祖细胞随机分5组：对照组加含二甲基亚砜的培养液;吡格列酮组加入50 μmol/L吡格列酮;PPAR-γ拮抗剂组加入50 μmol/L吡格列酮及10 μmol/L过氧化物酶体增殖物激活受体γ拮抗剂GW9662;PI3K/Akt阻滞剂组加入50 μmol/L吡格列酮及50 μmol/L磷脂酰肌醇3-激酶/蛋白激酶B通道阻滞剂Wortmannin;ERK阻滞剂组加入50 μmol/L吡格列酮及20 μmol/L细胞外调节蛋白激酶通道阻滞剂PD98059,观察不同组内皮祖细胞的增殖情况。 结果与结论：倒置显微镜下见培养前4 d细胞增殖不明显,第5-10天迅速增殖,并可见细胞集落及线状结构形成,第10天可达80%融合。培养第7天的内皮祖细胞具有吞噬Dil标记的乙酰化低密度脂蛋白和FITC标记的荆豆凝集素1的功能。10-200 μmol/L的吡格列酮均可明显促进内皮祖细胞的增殖(P < 0.01),以50 μmol/L吡格列酮的作用最明显。进一步阻断相关信号通路发现,Wortmannin和GW9662可明显拮抗吡格列酮的促细胞增殖作用,而PD98059对吡格列酮的作用无影响。说明吡格列酮促进大鼠骨髓内皮祖细胞增殖的作用是通过磷脂酰肌醇3-激酶/蛋白激酶B信号通路介导的。     

Transgelin is a marker of repopulating mesangial cells after injury and promotes their proliferation and migration

Mesangial cell (MC) migration is essential during glomerular repair and kidney development. The aim of the study was to identify marker/player for glomerular progenitor/reserve cells migrating into the glomerulus after MC injury and during glomerulogenesis in the rat. Experimental mesangial proliferative nephritis was induced in Sprague Dawley rats by intravenous injection of OX-7 antibody. We investigated mRNA expression profiles in isolated glomeruli from on days 0, 1, 2, 3, and 5 after induction of anti-Thy1 nephritis using Affymetrix microarray technology. Using self-organizing maps, transgelin was identified as a new marker for repopulating glomerular cells. Expression of transgelin during anti-Thy1 nephritis was investigated by northern blot, real-time PCR, western blot, and immunohistochemistry. Migration and proliferation assays using isolated MCs after transgelin knockdown by siRNA were performed to investigate the potential role of transgelin during glomerular repopulation. Transgelin mRNA was not detected in healthy glomeruli. It was strongly upregulated during the repopulation process starting on day 1, continued to be increased until day 5 and disappeared on day 7. Transgelin was specifically expressed at the edge of the migratory front during glomerular repopulation as indicated by transgelin/OX-7 double staining. Transgelin expression was similar in migrating vs non-migrating MCs in vitro. Blocking of transgelin expression by siRNA treatment resulted in inhibition of MC migration and proliferation. Transgelin was also expressed in MCs during glomerulogenesis and in biopsies from patients with IgA nephritis. In conclusion, transgelin in the kidney is upregulated in repopulating MCs in vivo and supports their migratory and proliferative repair response after injury.     

ATF4重组慢病毒抑制C2C12细胞增殖并促凋亡

目的 构建人活性转录因子4(ATF4)慢病毒,探讨C2C12细胞成骨分化过程中ATF4基因慢病毒修饰对其增殖和凋亡的影响.方法 构建ATF4重组慢病毒载体质粒,然后与2个包装质粒共转入293T细胞中包装成ATF4慢病毒(LV-ATF4);用病毒感染C2C12细胞,并用流式细胞仪(FCM)检测BMP2诱导C2C12细胞分化时对其增殖凋亡的影响,免疫印迹法检测凋亡相关蛋白的表达,电子显微镜观察凋亡细胞的形态学结构变化.结果 成功构建和包装了ATF4重组慢病毒.FCM检测结果表明,BMP2+ LV-ATF4处理组S期细胞(14.89％)低于BMP2+ LV-GFP组(30.64％) (P ＜0.05);BMP2+ LV-ATF4处理组细胞凋亡率(31.06％)高于BMP2+ LV-GFP组(11.39％)(P＜0.05);凋亡相关蛋白的表达与FCM结果一致.结论 在BMP2诱导C2C12细胞成骨分化时,LV-ATT4慢病毒可促进C2C12细胞的凋亡,抑制其增殖.     

Hyaluronic acid promotes proliferation and migration of human meniscus cells via a CD44-dependent mechanism

Purpose: Treatment of meniscal injury is important for osteoarthritis (OA) prevention. Meniscus cells are divided between inner and outer cells, which have different characteristics and vascularity. We evaluated the effects of hyaluronic acid (HA) on the proliferation and migration of human inner and outer meniscus cells, and investigated the underlying healing mechanisms.

Materials and Methods: Lateral menisci from 18 patients who underwent total knee arthroplasty were used. Meniscus cells were harvested from the outer and inner menisci and evaluated using migration and proliferation assays after treatment with HA or chondroitin sulfate (CS). The effects of HA on prostaglandin E2 (PGE2)-induced apoptosis and gene expression were evaluated.

Results: Cell migration and proliferation were increased by HA in a concentration-dependent manner, in both inner and outer meniscus cells. PGE2-induced apoptosis and caspase-3/7 activity were suppressed by HA in both inner and outer meniscus cells, and these effects were blocked by an anti-CD44 antibody. COL2A1 and ACAN mRNA levels were upregulated following HA treatment of inner meniscus cells. MMP13 mRNA was downregulated following CS stimulation of both inner and outer meniscus cells. These results suggest that CS treatment suppresses the inflammatory reaction rather than providing meniscal restoration. The phosphatidylinositol 3-kinase (PI3K) and mitogen-activated protein kinase (MAPK) pathways were activated by HA in both types of meniscus cells; these effects were blocked by treatment with an anti-CD44 antibody.

Conclusions: HA promoted human meniscus regeneration by inhibiting apoptosis, promoting cell migration, and accelerating cell proliferation, potentially through the PI3K/MAPK pathway via the CD44 receptor.