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1.
Background The aim of this study was to investigate the effect of transplantation of human umbilical cord blood endothelial progenitor cells on injured arteries.   
Methods Umbilical cord blood mononuclear cells were obtained from post-partum lying-in women, and EPCs were isolated, cultured, expanded and identified by immunofluorescence. The carotid arterial endothelium of New Zealand white rabbits was injured by dilatation with a 3F balloon; and the EPCs were injected into the lumen of the injured artery in the transplanted group (n=16), while an equal volume of PBS was injected in the control group after balloon injury (n=16). The animals were sacrificed after either 2 or 4 weeks, and the grafted cells were indentified by double immunofluorescence staining with human nuclear antigen (HNA) and CD31 antibodies. Arterial cross sections were analyzed by pathology, immunohistochemisty and morphometry to evaluate the reparative effects of EPCs. PCNA and TGF-β1 mRNA expression were detected by RT-PCR.
Results Fluorescence-labeled EPCs were found in the neointima; the neointimal area and the neointimal/medial area ratio were significantly lower in the transplanted than in the control group (P<0.05). VWF immunohistostaining showed more VWF-positive cells in the transplanted animals than the control ones (8.75±2.92 vs 4.50±1.77, P<0.05). Compared with the control group, the transplanted group had lower expression of PCNA mRNA (0.67±0.11 vs 1.25±0.40, P<0.01) and higher expression of TGF-β1 mRNA (1.10±0.21 vs 0.82±0.07, P<0.05).
Conclusion EPCs derived from human umbilical cord blood were successfully transplanted into injured vessels. The transplanted EPCs inhibited neointimal hyperplasia and promoted vascular reendothelialization.
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2.
Wu YT  Li JX  Liu S  Xin Y  Wang ZJ  Gao J  Ji BY  Fan XM  Zhou QW 《中华医学杂志(英文版)》2012,125(11):1903-1907
Background  Endothelial progenitor cells (EPCs) are used in vascular tissue engineering and clinic therapy. Some investigators get EPCs from the peripheral blood for clinic treatment, but the number of EPCs is seldom enough. We have developed the cultivation and purification of EPCs from the bone marrow of children with congenital heart disease, to provide enough seed cells for a small calibre vascular tissue engineering study.
Methods  The 0.5-ml of bone marrow was separated from the sternum bone, and 5-ml of peripheral blood was collected from children with congenital heart diseases who had undergone open thoracic surgery. CD34+ and CD34+/VEGFR+ cells in the bone marrow and peripheral blood were quantified by flow cytometry. CD34+/VEGFR+ cells were defined as EPCs. Mononuclear cells in the bone marrow were isolated by Ficoll® density gradient centrifugation and cultured by the EndoCult Liquid Medium Kit™. Colony forming endothelial cells was detected. Immunohistochemistry staining for Dil-ac-LDL and FITC-UEA-1 confirmed the endothelial lineage of these cells.
Results  CD34+ and CD34+/VEGFR+ cells in peripheral blood were (0.07±0.05)% and (0.05±0.02)%, respectively. The number of CD34+ and CD34+/VEGFR+ cells in bone marrow were significantly higher than in blood, (4.41±1.47)% and (0.98±0.65)%, respectively (P <0.0001). Many colony forming units formed in the culture. These cells also expressed high levels of Dil-ac-LDL and FITC-UEA-1.
Conclusion  This is a novel and feasible approach that can cultivate and purify EPCs from the bone marrow of children with congenital heart disease, and provide seed cells for small calibre vascular tissue engineering.
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3.
Objective To create the tissue engineering heart valve (TEHV) by seeding human umbilical vein endothelial cells (HUVECs) on decellular porcine aortic valve and investgate its mechanism of endothelial cells in adhesion and proliferation.Methods The porcine aortic valve was acellularized by using trypsin、EDTA、Triton X-100、RNase and DNase treatment.Biomechanical characteristics of fresh valves and acellularized valves were tested.  相似文献   

4.
Background  Parthenolide has been tested for anti-tumor activities, such as anti-proliferation and pro-apoptosis in recent studies. However, little is known about its role in the process of tumor angiogenesis. This study aims to investigate the effects and potential mechanisms of parthenolide on the proliferation, migration and lumen formation capacity of human umbilical vein endothelial cells.
Methods  Different concentrations of parthenolide were applied to the human breast cancer cell line MDA-MB-231 cells. After 24-hour incubation, the culture supernatants were harvested and used to treat human umbilical vein endothelial cells for 24 hours. Then an inverted fluorescence phase contrast microscope was used to evaluate the human umbilical vein endothelial cells. The secretion of vascular endothelial growth factor (VEGF), interleukin (IL)-8 and matrix metalloproteinases (MMP)-9 in the culture supernatant of the MDA-MB-231 cells was then measured with enzyme-linked immunosorbent assay (ELISA) assays.
Results  Suppression of proliferation, migration, and the lumen formation capacity of human umbilical vein endothelial cells was observed in the presence of the culture supernatants from the breast cancer cell line treated with different concentrations of parthenolide. Parthenolide decreased the levels of the angiogenic factors MMP-9, VEGF, and IL-8 secreted by the MDA-MB-231 cells.
Conclusions  Parthenolide may suppress angiogenesis through decreasing angiogenic factors secreted by breast cancer cells to interfere with the proliferation, migration and lumen-like structure formation of endothelial cells, thereby inhibiting tumor growth. It is a promising potential anti-angiogenic drug.
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5.
The aim of this study was to fabricate biomatrix/polymer hybrid scaffolds using an electrospinning technique. Then tissue engineered heart valves were engineered by seeding mesenchymal stromal cells (MSCs) onto the scaffolds. The effects of the hybrid scaffolds on the proliferation of seed cells, formation of extracellular matrix and mechanical properties of tissue engineered heart valves were investigated. MSCs were obtained from rats. Porcine aortic heart valves were decellularized, coated with poly(3-hydroxybutyrate-co-4-hydroxybutyrate) using an electrospinning technique, and reseeded and cultured over a time period of 14 days. In control group, the decellularized valve scaffolds were reseeded and cultured over an equivalent time period. Specimens of each group were examined histologically (hematoxylin-eosin [HE] staining, immunohistostaining, and scanning electron microscopy), biochemically (DNA and 4-hydroxyproline) and mechanically. The results showed that recellularization was comparable to the specimens of hybrid scaffolds and controls. The specimens of hybrid scaffolds and controls revealed comparable amounts of cell mass and 4-hydroxyproline (P〉0.05). However, the specimens of hybrid scaffolds showed a significant increase in mechanical strength, compared to the controls (P〈0.05). This study demonstrated the superiority of the hybrid scaffolds to increase the mechanical strength of tissue engineered heart valves. And compared to the decellularized valve scaffolds, the hybrid scaffolds showed similar effects on the proliferation of MSCs and formation of extracellular matrix. It was believed that the hybrid scaffolds could be used for the construction of tissue engineered heart valves.  相似文献   

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Background  Endothelial progenitor cells (EPCs) transplantation is a promising therapeutic strategy for ischemic retinopathy. The current study aimed to establish a simple, reliable and fluorescent labeling method for tracking EPCs with 5-(and-6)-carboxyfluorescein diacetate succinimidyl ester (CFSE) in laser-injured mouse retina.

Methods  EPCs were isolated from human umbilical cord blood mononuclear cells, cultivated, and labeled with various concentrations of CFSE. Based on fluorescence intensity and cell morphology, a 15 minutes incubation with 5 μmol/L CFSE at 37°C was selected as the optimal labeling condition. The survival capability and the apoptosis rate of CFSE-labeled EPCs were measured by Trypan blue staining and Annexin V/PI staining assay respectively. Fluorescence microscopy was used to observe the label stability during the extended culture period. Labeled EPCs were transplanted into the vitreous cavity of pigmented mice injured by retinal laser photocoagulation. Evans Blue angiography and flat mounted retinas were examined to track the labeled cells.

Results  EPCs labeled with 5 μmol/L CFSE presented an intense green fluorescence and maintained normal morphology, with no significant changes in the survival capability or apoptosis rate after being labeled for 2 days, 1 and 4 weeks. The fluorescence intensity gradually decreased in the cells at the end of 4 weeks. Evans Blue angiography of the retina displayed the retinal capillarity network clearly and fluorescence leakage was observed around photocoagulated spots in the laser-injured mouse model. One week after transplantation of labeled EPCs, the fluorescent cells were identified around the photocoagulated lesions. Four weeks after transplantation, fluorescent tube-like structures were observed in the retinal vascular networks.

Conclusion  EPCs could be labeled by CFSE in vitro and monitored in vivo for at least 4 weeks, and participate in the repair of injured retinal vessels.

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8.

Background  Endothelial progenitor cells (EPCs) have been used in both experimental studies and clinical treatments of limb ischemia, as well as in the construction of engineered vascular tissue. The objective of this study was to investigate the effects of transplanted bone marrow-derived EPCs on the vein microenvironment in a rat model of chronic vein thrombosis.
Methods  Mononuclear cells were isolated from the bone marrow of immature rats by density gradient centrifugation, cultured, and then transplanted into experimentally induced thrombi into inferior vena cava through the femoral vein. Vascular endothelial growth factor (VEGF), angiopoietin-1 (ANG-1)  and monocyte chemotactic protein-1 (MCP-1) mRNA and protein expression levels were measured by real-time quantitative polymerase chain reaction and Western blotting of thrombi and adjacent caval walls 28 days post-transplantation.
Results  Levels of VEGF, ANG-1, and MCP-1 mRNA in EPC-transplanted thrombi were 100%, 230.7%, and 212.5% of levels detected in the sham-operated group (P<0.01), and 99.9%, 215.4%, and 177.8% of levels detected in the experimental control group (P< 0.01). VEGF, ANG-1 and MCP-1 protein levels exhibited a similar trend.
Conclusions  Transplanted bone marrow-derived EPCs appear to alter the vein microenvironment in experimentally induced chronic vein thrombosis by upregulating cytokines associated with thrombic organization and recanalization.

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9.
The cell adhesive properties of decellularized valve scaffolds were promoted by immobilization of valve scaffold with arginine-glycine-aspartic acid (RGD)-containing peptides. Porcine aortic valves were decellularized with trypsin/EDTA, and detergent Triton X-100. With the help of a coupling reagent Sulfo-LC-SPDP, the valve scaffolds were immobilized with glycine-arginine-glycine-aspartic acid-serine-proline-cysteine (GRGDSPC) peptide. X-ray photoelectron spectroscopy (XPS) was used for surface structure analysis. Myofibroblasts harvested from rats were seeded onto the valve scaffolds. Cell count by using microscopy and modified MTT assay were performed to assess cell adhesion. Based on the spectra of XPS, the conjugation of GRGDSPC peptide with decellularized valve scaffolds was confirmed. Both cell count and MTT assay showed that myofibroblasts were much easier to adhere to the modified valve scaffolds, which was also confirmed histologically. Our findings suggest that it is feasible to immobilize RGD-containing peptides onto decellularized valve scaffolds. And the technique can effectively promote cell adhesion, which is beneficial for in vitro tissue engineering of heart valves.  相似文献   

10.
11.
目的:以人脐静脉血管内皮细胞(HUVECs)为种子细胞,体外构建组织工程心脏瓣膜(TEHV),并对其分泌纤溶物质——组织型纤溶酶原激活物(t-PA)及其抑制物(PAI-1)的作用进行观察。方法:获取并扩增HUVECs,种植在猪脱细胞主动脉瓣叶上,体外静态构建TEHV。观察内皮细胞的形态学变化和生长状况。收集瓣膜培养液,采用发色底物法检测瓣膜内皮细胞分泌的t-PA和PAI-1活性。结果:以猪脱细胞主动脉瓣叶作支架,HUVECs做种子细胞,体外成功构建TEHV,种植的HUVECs在瓣膜表面长成一层连续的细胞层,生长状态良好。瓣膜表面的内皮细胞能够分泌纤溶物质t-PA和PAI-1。结论:HUVECs种植在猪脱细胞瓣膜支架上可以构建TEHV,且瓣膜内皮细胞能够分泌t-PA和PAI-1。  相似文献   

12.
目的探讨环氧氯丙烷对组织工程心脏瓣膜构建中基质金属蛋白酶-9(Matrix metalloproteinase-9;MMP-9)表达的影响。方法采用去垢剂和胰蛋白酶消化制备脱细胞猪主动脉瓣膜支架,用3%环氧氯丙烷处理48h的去细胞支架材料作为实验组;用0.2%戊二醛处理48h的去细胞支架材料作为对照组。将培养的人骨髓基质干细胞(human bone marrow mesenchy-mal stem cells;hBMSCs)种植于脱细胞支架上构建组织工程心脏瓣膜(tissue engineered heart valves;TEHV),分别行石蜡包埋切片HE染色和扫描电镜观察TEHV的组织结构,免疫组化检测MMP-9表达的阳性率。结果hBMSCs在实验组脱细胞瓣膜表面生长良好,MMP-9的表达比对照组降低。结论环氧氯丙烷处理的脱细胞猪主动脉瓣膜支架,可以抑制hBMSCs的MMP-9表达,对防止组织工程心脏瓣膜钙化的形成有一定作用。  相似文献   

13.
Background Cell-based vascular therapies of endothelial progenitor cells (EPCs) mediated neovascularization is still a novel but promising approach for the treatment of ischemic disease. The present study was designed to investigate the therapeutic potentials of human umbilical cord blood-derived EPCs (hUCB-EPCs) in rat with acute myocardial infarction. Methods Human umbilical cord blood (hUCB) mononuclear cells were isolated using density gradient centrifugation from the fresh human umbilical cord in healthy delivery woman, and cultured in M199 medium for 7 days. The EPCs were identified by double-positive staining with 1,1'-dioctadecyl-3,3,3',3'-tetramethylindocarbocyanine percholorate-labeled acetylated low-density lipoprotein (DiI-Ac-LDL) and fluorescein isothiocyanate-conjugated Ulex europaeus lectin (FITC-UEA-I). The rat acute myocardial infarction model was established by the ligation of the left anterior descending artery. The hUCB-EPCs were intramyocardially injected into the peri-infarct area. Four weeks later, left ventricular function was assessed by a pressure-volume catheter. The average capillary density (CAD) was evaluated by anti-VIII immunohistochemistry staining to reflect the development of neovascularization at the peri-infarct area. The graft cells were identified by double immunofluorescence staining with human nuclear antigen (HNA) and CD31 antibody, representing human origin of EPCs and vascular endothelium, respectively. Expressions of cytokines, proliferating cell nuclear angigen (PCNA), platelet endothelial cell adhesion molecule (PECAM) and vascular endothelial growth factor (VEGF) were detected to investigate the underlying mechanisms of cell differentiation and revascularization. Results The donor EPCs were detectable and integrated into the host myocardium as confirmed by double-positive immunofluorescence staining with HNA and CD31. And the anti-VIII staining demonstrated a higher degree of microvessel formation in EPCs transplanted rats, associated with a significant improvement of global heart function in terms of the increase of left ventricular end-systolic pressure (LVESP), +dp/dtmax and -dp/dtmax as well as the decrease of LVEDP in rats with EPCs therapy comparing to the control rats (P〈0.05). Moreover, the expression of the rat PCNA mRNA and PECAM were both enhanced in the EPCs group compared with that of the control group. Conclusions The human umbilical cord blood-derived EPCs could incorporate into new-born capillaries in rat myocardium, induce revascularization and improve the proliferation activity in the peri-infarct area, resulting in the improvement of global heart function. This may indicate a promising stem cell resource in cell-based therapy for ischaemic diseases.  相似文献   

14.
目的从人脐带血中分离内皮祖细胞(endothelial progenitor cells,EPCs),建立人脐血内皮祖细胞体外培养的方法,为实现内皮祖细胞的移植及实验研究提供足量的细胞来源。方法采用密度梯度离心法分离人脐带血内皮祖细胞,在EGM-2培养基中培养,采用流式细胞仪、免疫组化和免疫荧光鉴定EPCs。结果脐带血单个核细胞在经EGM-2培养过程中出现梭形贴壁和铺路石样等形态;1周后既分化成EPCs,细胞免疫荧光CD133染色率在培养第7天为(67.2±2.12)%,免疫组化CD34染色率为(89.67±2.05)%,流式细胞仪鉴定该种细胞CD133与KDR的双阳性率达87.8%。可确定该细胞为EPSc。结论采用本培养方法可获得良好的内皮祖细胞用于实验研究。  相似文献   

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Background Cell transplantation has great potential for promoting endothelial repair and reducing the complications of percutaneous coronary intervention (PCI).The aim of this study was to investigate ...  相似文献   

17.
内皮祖细胞在胶质瘤新生血管中的募集和整合作用   总被引:1,自引:0,他引:1  
目的 探讨内皮祖细胞(EPCs)在胶质瘤血管新生化过程中的作用.方法 采用密度梯度离心法分离人脐血EPCs.应用人脑胶质瘤细胞系U87细胞建立原位移植动物模型,于瘤细胞接种后第7天将EPCs经尾静脉注入荷瘤鼠,并分别于尾静脉注射后7、14、21d观察EPCs植入后在移植瘤血管新生过程中的募集、整合作用以及对肿瘤生长的影响.结果 胶质瘤原位移植模型成瘤率为100%.在EPCs植入后14、21d被募集和整合到肿瘤血管中的EPCs数量显著多于第7天(P<0.05),肿瘤微血管密度和移植瘤体积也显著高于对照组(P<0.05).结论 人脐血EPCs能够被募集并整合到肿瘤血管中促进胶质瘤生长,提示其在胶质瘤血管新生化过程中可能具有重要作用.  相似文献   

18.
目的:探讨人脐静脉内皮细胞(HUVECs)种植在去细胞瓣叶上构建组织工程心脏瓣膜的可行性。方法:测定瓣叶去细胞前、后的生物力学性能;观察去细胞瓣叶上内皮细胞生长情况。结果:瓣叶去细胞可获得完整无细胞的纤维支架,瓣叶去细胞前、后的生物力学性能无差异;内皮细胞在去细胞瓣叶表面生长,形成一层基本连续的细胞层。结论:去细胞瓣叶组织是一种良好的纤维支架,可以用于构建组织工程瓣膜;内皮细胞种植在去细胞瓣叶上构建组织工程心脏瓣膜是可行的。  相似文献   

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