羊膜培养液体外抑制兔角膜上皮细胞血管内皮生长因子的表达

目的:探讨羊膜培养液对角膜上皮细胞中血管内皮细胞生长因子(vascula rendothelial growth factor,VEGF)表达的影响。方法:刮除并收集新鲜兔角膜上皮细胞,传代培养接种于35mm培养皿及自制的羊膜培养皿上。实验分为4组,Ⅰ组(对照组):无血清的DMEM培养液,Ⅱ组:去上皮的羊膜培养液,Ⅲ组:未去上皮的羊膜培养液,Ⅳ组:将细胞直接接种于无上皮羊膜。作用48h后用Trizol法提取各组样本的总RNA,进行RT-PCR一步法反应检测各组VEGF mRNA表达并与β-actin比较。结果:正常角膜上皮细胞中有VEGF基因表达,在Ⅲ,Ⅳ组中表达受到明显抑制(P<0.01,n=5)。结论:羊膜培养液明显抑制VEGF mRNA在角膜上皮细胞中的表达。     

人羊膜上皮细胞培养液抑制角膜新生血管的实验研究

背景 角膜新生血管(CNV)是一种常见的眼部病变,研究其发病机制及其抑制剂是眼科研究的热点和难点. 目的 研究人羊膜上皮细胞(AECs)培养液对CNV的抑制作用及机制. 方法 消化法培养及鉴定人AECs,并收集培养液,酶联免疫吸附试验(ELISA)法检测色素上皮衍生因子(PEDF)和白细胞介素1受体拮抗剂( IL-1Ra)在培养液中的质量浓度.兔角膜上皮细胞分离后分别用无血清DMEM培养基、人AECs培养液、混合培养液(DMEM+人AECs培养液)培养48 h,采用实时定量聚合酶链反应(QRT-PCR)法检测不同培养液培养的角膜上皮细胞中血管内皮生长因子(VEGF)及碱性成纤维细胞生长因子(bFGF)的表达.用含质量分数10％胎牛血清的DMEM培养基培养人脐静脉血管内皮细胞(UVECs),并分别加入无血清DMEM、混合培养液和人AECs培养液,划痕法和细胞计数试剂盒8(CCK8)法检测各组培养液对人UVECs迁移的影响.分别在上述3种培养基中加入终质量浓度为50 μg/L的bFGF,CCK8法检测各培养液中人UVECs的增牛情况.在原子力显微镜(AFM)下观察人AECs培养液对人UVECs超微结构的影响. 结果 人羊膜培养和传代细胞角蛋白免疫组织化学染色阳性证实为人AECs.与无血清DMEM组相比,人AECs培养液组的兔角膜上皮细胞VEGF mRNA(1.00±0.22 vs.2.98±0.46)及bFGF mRNA( 1.00±0.36vs.2.55±0.48)的表达均明显下降,差异均有统计学意义(P=0.001、0.002);培养后不同时间人AECs培养液组人UVECs的增生吸光度(A)值明显下降,差异均有统计学意义(P＜0.05),人UVECs的迁移率下降,差异有统计学意义(P＜0.05).AFM观察见人AECs培养液组的血管内皮细胞膜粗糙、表面颗粒紊乱,细胞间连接及伪足减少.ELISA法检测人AECs培养液中PEDF的质量浓度为(70.41 ±0.68) μg/L,IL-1Ra的质量浓度为(153.56±0.36) ng/L,无血清DMEM组中未检出.结论 人AECs培养液可抑制角膜上皮VEGF及bFGF的表达,抑制血管内皮细胞的增生和迁移,细胞结构和功能改变,这可能是其抑制CNV的机制之一.     

体外诱导人羊膜上皮细胞分化为角膜上皮样细胞的初步研究

目的探索以人永生化角膜上皮细胞( immortalized human corneal epithelial cells,ihCEC) 培养液体外模拟角膜上皮细胞微环境,诱导人羊膜上皮细胞( human corneal epithe-lial cells,hAEC) 分化为角膜上皮样细胞的可行性。方法取( 37 ± 1) 周剖宫产人羊膜组织,酶消化法提取 hAEC; 流式细胞仪测 CD29、CD90、CD105、CD34、HLA-DR 的表达。复苏培养 ihCEC,以 0 mg·L- 1、10 mg·L- 1、20 mg·L- 1、30 mg·L- 1、40 mg·L- 1丝裂霉素 37℃作用 2 h,吸去丝裂霉素,继续培养 72 h 后 CCK8 测吸光度并计算增殖抑制率。10 mg·L- 1、20 mg·L- 1丝裂霉素处理细胞后 12 h、24 h 收集细胞培养液培养 hAEC,CCK8 测吸光度绘制生长曲线; 收集 ihCEC 细胞培养液,制备条件培养基( CM) 培养 hAEC 10 d,倒置显微镜观察细胞形态,免疫荧光检测 CK12 的表达。结果 hAEC 可表达 CD29、CD90、D105,不表达 CD34、HLA-DR; 各浓度丝裂霉素组增殖抑制率分别为 10 mg·L- 1( 65. 48% ±1. 03) 、20 mg · L- 1( 77. 01% ± 0. 99) 、30 mg · L- 1( 75. 25% ± 0. 71) 、40 mg · L- 1( 76. 90% ±0. 97) ;20 mg·L- 1丝裂霉素培养 12 h 收集的细胞培养液对 hAEC 具有明显促增殖作用; 诱导分化后 hAEC 可表达 CK12。结论以 ihCEC 细胞培养液模拟的角膜上皮细胞微环境可诱导 hAEC 分化为角膜上皮样细胞。     

血管内皮细胞生长因子在糖尿病性视网膜病变进展中的作用

糖尿病性视网膜病变是糖尿病微血管病变常见而严重的并发症,在很大程度上导致不可逆的视功能损害或完全失明.VEGF在DR发生、发展,尤其在视网膜新生血管形成过程中发挥重要作用,本文就血管内皮生长因子与糖尿病性视网膜病变的关系进行综述。     

血管内皮生长因子及其受体与糖尿病视网膜病变

视网膜新生血管形成和黄斑水肿是糖尿病视网膜病变(diabeticretinopathy,DR)的主要临床表现,也是DR主要的致盲原因。目前研究表明血管内皮生长因子(vascularen-dothelialgrowthfactor,VEGF)在糖尿病视网膜微血管并发症的发生中发挥重要作用,因此VEGF成为当今DR治疗干预的一个研究热点。本文就VEGF及其受体在DR中的表达及其相关治疗措施进行综述。     

P97抵抗高糖培养的人视网膜血管内皮细胞增殖

目的:研究含缬酪肽蛋白(valosin-containing protein,P97)对高糖培养的人视网膜血管内皮细胞的作用。方法:体外高糖培养人视网膜血管内皮细胞(HRCECs),转染P97的RNA干扰质粒到HRCECs,抑制P97的表达,观察血管内皮生长因子(VEGF)的mRNA水平变化,同时观察HRCECs增殖的变化。结果:RNA干扰P97组和对照组的VEGF/actin分别为:0.21±0.03和0.10±0.01,两组差异有显著性(P<0.05),RNA干扰P97组和对照组,HRCECs在G1期细胞分别为44.05%±3.62%、25.21%±3.20%,两组比较差异有显著性(P<0.05)。结论:当P97表达受抑制后,VEGF的表达增高,HRCECs的增殖增强,这些变化可能与DR的发生发展相关。     

Effect of geniposide on retinal microangiogenesis in rats with diabetic retinopathy and its mechanism北大核心

Objective To investigate the effect of geniposide (Gen) on retinal microangiogenesis in rats with diabetic retinopathy (DR) and its mechanism. Methods Fifty 6-week-old SPF male Wistar rats with normal eyes were randomly divided into the normal group, model group, low-dose Gen group, high-dose Gen group, and calcium dobesilate group, with 10 rats in each group. Except for the normal group, rats in the other groups were fed high-sugar and high-fat diets and induced by streptozotocin to establish the DR rat models. After modeling, drug intervention was carried out immediately. Rats in the low- and high-dose Gen groups were given 25 mg·kg-1 and 100 mg·kg-1 Gen intragastrically, rats in the calcium dobesilate group were given 5.8 mg·kg-1 calcium dobesilate intragastrically, while rats in the normal and model groups were given the same amount of solvent intragastrically, once a day for 4 weeks. During the drug administration period, rats in the normal group continued to be fed normal diets, and rats in the other groups continued to be fed high-sugar and high-fat diets. Levels of vascular endothelial growth factor (VEGF) and soluble VEGF receptor 1 (sFlt-1) in serum were measured by the enzyme-linked immunosorbent assay. Retinal pathological changes were exhibited by hematoxylin-eosin staining. Retinal microangiogenesis was revealed by periodic acid-Schiff staining. The expression levels of VEGF, hypoxia-inducible factor-1α (HIF-1α), intercellular adhesion molecule-1 (ICAM-1), and sFlt-1 in the retina were measured by Western blot. Results At the end of drug intervention (week 4), serum VEGF level in the model group was higher than that in the normal group, while sFlt-1 level was lower than that in the normal group (both P<0.001); serum VEGF level in the high-dose Gen and calcium dobesilate groups was lower than that in the model group, while sFlt-1 level was higher than that in the model group (all P<0.001); there were no significant differences in the above indexes between the low-dose Gen group and the model group (all P>0.05). At the end of drug intervention (week 4), the retinal morphology of rats in the normal group was normal, and the cells in the inner and outer nuclear layers were arranged neatly; cells in the inner and outer nuclear layers were arranged loosely, ganglion cells were reduced, and capillary congestion was observed in the model and low-dose Gen groups; the arrangement of cells in the inner and outer nuclear layers in the high-dose Gen and calcium dobesilate groups tended to be normal, and ganglion cells increased compared with the model group. At the end of drug intervention (week 4), the retinal vascular diameter in the model group was uneven, with segmental enlargement, and retinal microangiogenesis was more significant than that in the normal group (P<0.001); retinal microangiogenesis in the high-dose Gen and calcium dobesilate groups was less significant than that in the model group (both P<0.001); there was no significant difference in retinal microangiogenesis between the low-dose Gen group and the model group (P>0.05). At the end of drug intervention (week 4), the relative expression levels of VEGF, HIF-1α and ICAM-1 proteins in the model group were higher than those in the normal group, while the relative expression level of sFlt-1 protein was lower than that in the normal group (all P<0.001); the relative expression levels of VEGF, HIF-1α and ICAM-1 proteins in the high-dose Gen and calcium dobesilate groups were lower than those in the model group, while the relative expression level of sFlt-1 protein was higher than that in the model group (all P<0.001); there were no significant differences in the above indexes between the low-dose Gen group and the model group (all P>0.05). Conclusion Gen can inhibit the expression of VEGF and promote the expression of sFlt-1, which in turn reduces retinal microangiogenesis in DR rats to treat DR. © The Author(s) 2023.     

人羊膜匀浆上清液抑制兔角膜新生血管的研究

目的观察人羊膜匀浆上清液对家兔角膜新生血管（CNV）的抑制作用。方法63只新西兰白兔随机选取3只作为正常对照组,余60只制作双眼碱烧伤模型,随机分为4个组：A组为碱烧伤对照组滴用PBS液,B、C、D组为实验组分别滴用50、200、400μg／mL的羊膜匀浆上清液。术后1、5、7、14、28d每组分别随机处死3只兔子,行组织病理学检查,测量微血管数量、多形核白细胞（PMNL）含量、血管内皮生长因子（VEGF）的表达量。结果碱烧伤1、5、7、14、28d各时间点CNV的生长面积、微血管计数、PMNL浸润、VEGF的表达4个组差异均有统计学意义（P〈0．01）,其中D组均数最小。VEGF、PMNL、微血管计数三者呈正相关（P〈0．01）。结论羊膜匀浆上清液有减轻角膜血管化的作用,呈质量浓度依赖性,质量浓度达到400μg／mL时抑制作用显著增强。     

Ibrolipim对糖尿病小型猪视网膜血管内皮生长因子表达的影响

目的　观察血管内皮生长因子(VEGF)在早期糖尿病视网膜病变中的表达以及Ibrolipim (NO 1886)对 2型糖尿病小型猪血糖的影响;探讨药物Ibrolipim对视网膜VEGF的作用。 方法　采用高脂高蔗糖饲料喂养贵州小香猪,创建 2型糖尿病动物模型,并用Ibrolipim进行干预,用RT PCR、免疫组织化学和Westernblot技术检测VEGF转录和蛋白表达。 结果　正常组视网膜VEGFmRNA表达量少,免疫组织化学反应阳性较弱,VEGF蛋白表达较低;实验组视网膜VEGFmRNA表达上调,免疫组织化学反应呈强阳性 (P<0 01 ),VEGF蛋白表达增高;治疗组视网膜VEGFmRNA及VEGF蛋白表达介于其他两组之间。 结论　早期糖尿病视网膜中VEGF表达增高;Ibrolipim可通过降低血糖,改善视网膜组织缺氧,来抑制VEGFmRNA及蛋白的表达。     

抗血管内皮生长因子药物治疗糖尿病视网膜病变的研究现状

糖尿病可引起眼内血管内皮生长因子（vascularendothelialgrowthfactor,VEGF）水平病理性升高,导致眼内新生血管形成、黄斑水肿的发生。抗VEGF药物最早被用于湿性年龄相关性黄斑变性,现也被试验性地用于糖尿病视网膜病变（diabeticretinopathy,DR）。VEGFl65选择性拮抗剂Pe—gaptanib与VEGF—A单抗Ranibizumab被批准玻璃体内注射,且对DR有较好的疗效;VEGF．A全长抗体Bevacizumab被标示外用于玻璃体内注射治疗DR,也能达到较好的效果;重组融合蛋白Aflibercept针对DR的疗效也得到一些试验的支持。玻璃体内注射抗VEGF药物治疗DR已被证实短期有效且安全,但其长期的疗效与安全性有待更多的大规模临床试验来验证。     

Phosphorylation of alphaB-crystallin in epiretinal membrane of human proliferative diabetic retinopathy

AIM: To examine phosphorylation of alphaB-crystallin (p-?BC), a vascular endothelial growth factor (VEGF) chaperone, and immunohistochemically investigate relationship between p-?BC, VEGF and phosphorylated p38-mitogen-activated protein kinase (p-p38 MAPK) in the epiretinal membrane of human proliferative diabetic retinopathy (PDR). METHODS: Eleven epiretinal membranes of PDR surgically excised were included in this study. Two normal retinas were also collected from enucleation tissues due to choroidal melanoma. Paraformaldehyde-fixed, paraffin-embedded tissue sections were processed for immunohistochemistry with anti-p-?BC, VEGF, CD31, and p-p38 MAPK antibodies. RESULTS: Immunoreactivity for p-?BC was observed in all of the epiretinal membranes examined, where phosphorylation on serine (Ser) 59 showed strongest immunoreactivity in over 70% of the membranes. The immunolocalization of p-?BC was detected in the CD31-positive endothelial cells, and co-localized with VEGF and p-p38 MAPK in PDR membranes. Immunoreactivity for p-?BC, however, was undetectable in endothelial cells of the normal retinas, where p-p38 MAPK immunoreactivity was less marked than PDR membranes. CONCLUSION: Phosphorylation of ?BC, in particular, phosphorylation on Ser59 by p-p38 MAPK may play a potential role as a molecular chaperon for VEGF in the pathogenesis of epiretinal membranes in PDR.     

白细胞介素-2对高糖状态下人视网膜色素上皮细胞的影响

目的研究白细胞介素-2(IL-2)对高糖状态下人视网膜色素上皮(RPE)细胞的增殖及其分泌和表达血管内皮细胞生长因子(vascular endothelial growth factor,VEGF)的影响。方法MTT自动比色法观察IL-2浓度对高糖状态下RPE细胞增殖的作用;ELISA法测RPE细胞分泌VEGF的变化;免疫组化观察RPE细胞表达VEGF的变化。结果0.1～10μg/L的IL-2均能明显促进高糖状态下RPE细胞的增殖,并能明显提高RPE细胞分泌VEGF的水平及提高VEGF在细胞中的表达。结论高糖状态下,IL-2可明显促进人RPE细胞的增殖并能提高RPE细胞分泌VEGF的水平和提高VEGF在RPE细胞中的表达,IL-2可能在增殖性糖尿病视网膜病变中起一定的作用。     

糖尿病性视网膜病变患者VEGF与微血管损伤的相关性

目的：探讨糖尿病视网膜病变(diabetic retinopathy, DR)患者血管内皮生长因子(vascular endothelial growth factor, VEGF)水平与微血管损伤程度的相关性。

方法：回顾性分析本院收治的糖尿病患者71例,根据有无DR及病变程度分为三组：单纯糖尿病组(n=31)、单纯型DR组(n=22)、增殖型DR组(n=18),比较各组微血管病变发生率。同时,取患者空腹肘静脉血,采用ELISA试剂盒测定血清VEGF水平,采用流式细胞仪检测内皮细胞(ECs)、内皮祖细胞(EPCs)、循环祖细胞(CPCs)计数。

结果：各组糖尿病肾病和糖尿病神经病变发生率有明显差异,增殖型DR组高于单纯型DR组和单纯糖尿病组,差异有统计学意义(P<0.05)。各组VEGF水平有明显差异,增殖型DR组高于单纯型DR组和单纯糖尿病组,单纯型DR组高于单纯糖尿病组; 合并糖尿病肾病及糖尿病神经病变者VEGF水平高于非合并者,差异均有统计学意义(P<0.05)。各组之间ECs、EPCs、CPCs水平有明显差异,增殖型DR组ECs高于单纯型DR组和单纯糖尿病组,单纯型DR组高于单纯糖尿病组; 增殖型DR组EPCs、CPCs水平低于单纯型DR组和单纯糖尿病组,单纯型DR组低于单纯糖尿病组,差异有统计学意义(P<0.01)。增殖型DR患者的VEGF水平与ECs水平呈正相关性(P<0.01),与EPCs、CPCs水平呈负相关性(P<0.01)。

结论：VEGF在糖尿病视网膜病变,尤其是增殖型糖尿病视网膜病变的临床诊断和医疗中,有重要意义。     

Elevated Vascular Endothelial Growth Factor Levels in the Vitreous of Patients With Proliferative Diabetic Retinopath

Objective: To detect the levels of vascular endothelial growth factor (VEGF) in the vitreous of patients with proliferative diabetic retinopathy (PDR) and to investigate the possible role of VEGF in the development of neovascularization in PDR. Methods ; Undiluted vitreous samples and fasting venous blood samples were obtained from 27 patients with PDR and 14 subjects with idiopathic macular hole who underwent pars plana vitrectomy. The concentration of VEGF was determined by quantitative enzyme - linked immunosorbent assay (ELISA).Results: The level of vitreous VEGF in patients with PDR (median 0. 41ng/ml, range 0. 09- 11. 56ng/ml) was significantly elevated when compared with that in control subjects (median 0.017ng/ml, range 0.008-0.04ng/ml)(P<0. 001). The median of PDR patients' serum VEGF concentration was 0.19ng/ml (0. 090. 46ng/ ml) which was far lower than vitreous VEGF concentration (P<0. 05). Vitreous VEGF concentration was higher in PDR patients with retinal detachment than that in patient wi     

Elevation of serum apelin-13 associated with proliferative diabetic retinopathy in type 2 diabetic patients

AIM:To compare apelin-13, a ligand of G-protein-coupled receptor which has been shown to be involved in retinal angiogenesis, and vascular endothelial growth factor (VEGF) serum levels in type 2 diabetes mellitus (T2DM) with or without retinopathy, and to investigate the relationship between the serum concentration of apelin-13 and diabetes retinopathy.METHODS: Sixty-nine patients with T2DM were enrolled. Of the 69 patients, 16 had proliferative diabetic retinopathy (PDR group), 23 had non-PDR (NPDR group) and 30 had no retinopathy (T2DM group). Subjects’ information, including demographics, medical history, and use of medications were recorded. Their serum samples were collected for measuring the levels of C-reactive protein (CRP), serum lipid and glycosylated hemoglobin. Apelin-13 and VEGF serum levels were measured by enzyme-linked immunosorbent assay. Kruskal-Wallis test and one-way ANOVA were used to compare the differences among these groups. Chi-square test was used to assess categorical variables. Correlations between variables were investigated by Spearman rho correlation test and stepwise regression analysis. All statistical analyses were performed through SPSS 17.0 software.RESULTS:Sex, age, body mass index (BMI), blood pressure, CRP, hemoglobin A1c (HbA1c) have no significantly difference in the three groups. Serum level of apelin-13 was significantly elevated in PDR group as compared with T2DM group (P=0.041). Differences of VEGF serum concentration in the three groups were statistically significant (P=0.007, P=0.007 and P<0.001, respectively). Spearman rho correlation test showed that serum apelin-13 was positively correlated with BMI, serum triglycerides, VEGF, but not with age, duration of diabetes, blood pressure, CRP, HbA1c and total-cholesterol. Stepwise regression analysis showed that BMI also significantly associated with serum apelin-13 (P=0.002), while VEGF and serum triglycerides were irrelevant.CONCLUSION: This study elucidated a positive association of apelin-13 serum level with PDR, but not with VEGF. Apelin-13 may influence the promotion of PDR but unrelated with VEGF.     

PDR中血管内皮生长因子与纤维化相关细胞因子的相关性

血管内皮生长因子在视网膜新生血管生成中是必不可少的重要诱导因子。增殖性糖尿病视网膜病变（ proliferative diabetic retinopathy, PDR）患者视网膜新生血管形成后,随着病情进一步加重,可造成纤维血管膜形成、视网膜前膜的纤维化加重,造成牵拉性视网膜脱离。目前研究认为,细胞因子具有促进成纤维细胞增殖、移动、黏附和分泌细胞外基质的功能,在糖尿病环境状态下,转变至促纤维化状态,导致了细胞外基质的积聚和纤维化。本文对血管内皮生长因子与纤维化相关细胞因子相关性的研究现状予以综述。