血管内皮生长因子在人年轻恒牙及成熟恒牙牙髓中的表达

目的：研究人年轻恒牙和成熟恒牙牙髓中血管内皮生长因子（vascular endothelial growth factor,VEGF）的表达及分布特征．探讨VEGF在恒牙牙根发育过程中的作用。方法：将因正畸或阻生拔除的健康牙分为2组,第1组年轻恒牙10例。第2组根尖闭合的成熟恒牙15例。对牙髓标本的石蜡切片进行VEGF的免疫组化染色,通过Imagepro-plus 5．1图像分析软件,对图像进行定量分析,采用SPSS13．0软件包进行χ^2检验、t检验、单因素方差分析及SNK-q检验。结果：VEGF在年轻恒牙牙髓成纤维细胞和成牙本质细胞胞质呈强阳性表达,显著强染于成熟恒牙（P〈0．05）;年轻恒牙根髓在喇叭状基顶区成纤维细胞VEGF染色强阳性,以此处向冠方及根方,VEGF表达逐渐减弱。结论：VEGF在人年轻恒牙和成熟恒牙牙髓组织中呈不同特征的表达．VEGF参与恒牙牙根的发育和成熟。     

血管内皮生长因子在人牙髓中的表达

目的：研究血管内皮生长因子（ vascular endothelial growth factor VEGF） 在正常、深龋或炎症牙髓中的表达及其意义。方法：采用免疫组化SABC法，对牙髓中的VEGF的表达进行组织学定位，并通过Image pro-plus 5.1图像分析软件对成牙本质细胞和牙髓成纤维细胞中VEGF染色进行平均光密度值（optical density OD）测定。利用SPSS13．0统计软件对各组数据进行单因素方差分析或秩和检验。结果：人牙髓中，VEGF主要表达在血管内皮细胞、成牙本质样细胞和牙髓成纤维细胞的胞浆中。正常组成牙本质细胞的VEGF表达较其它两组弱（P〈0.01）。与正常组相比，牙髓成纤维细胞中VEGF的表达在深龋组明显增强（P〈0．05），而在炎症组明显减弱（P〈0．05）。此外，VEGF在炎症组的某些炎细胞如中性粒细胞、浆细胞的胞浆中也有表达。结论：VEGF在龋病、牙髓炎中的变化可能与牙髓炎的发生、炎症发展有关，并且可能参与了成牙本质样细胞对牙髓损伤的修复过程。     

转化生长因子-β受体Ⅰ型及Ⅱ型在人年轻恒牙中的表达

目的　探讨转化生长因子 - β受体Ⅰ、Ⅱ (TGF βRⅠ、Ⅱ )在人年轻恒牙牙本质 -牙髓复合体中的表达及其生物学作用。方法　应用免疫组化方法检测TGF βRⅠ、Ⅱ在人年轻恒牙牙本质 -牙髓复合体中的表达。 结果　TGF βRⅠ、Ⅱ在年轻恒牙牙本质 -牙髓复合体中的表达呈现空间分布特异性 ,在成牙本质细胞中呈强阳性表达 ,其他牙髓细胞呈弱阳性表达。结论　TGF βRⅠ、Ⅱ在年轻恒牙牙本质 -牙髓复合体的修复过程中发挥重要作用。     

牙髓中血管内皮生长因子的研究进展

血管内皮生长因子是一种重要的血管生成因子,主要由血管内皮细胞产生。目前研究发现牙髓及牙本质基质中也存在少量的血管内皮生长因子,在细菌脂多糖或脂磷壁酸的诱导下出现反应性增加,可能参与一些生理、病理的调控。本文就V E G F在牙髓中的生物学活性和功能及其研究进展作一综述。     

兔正畸牙周组织血管内皮细胞生长因子及其受体2的表达

目的:研究血管内皮细胞生长因子(VEGF)及其受体2(VEGFR-2)在兔正畸牙周组织中的表达及其变化的相关性.方法:35只大耳白兔随机分成7组:正常组及实验1、3、5、7、14、21 d组,每组5 只.实验组动物于双侧上颌第一磨牙至切牙间拴结镍钛螺簧,0.08 N力拉上颌第一磨牙向近中移动.对实验标本行HE染色、VEGF、VEGFR-2免疫组化染色,进行组织学观察和计算机图像分析,对VEGF、VEGFR-2表达的灰度积分进行统计学处理.结果:正常牙周组织中VEGF及VEGFR-2有少量表达.实验1 d组~7 d组压力区VEGF及VEGFR-2的表达明显高于正常牙周组织,有显著性差异,峰值均出现在5 d组;实验1 d组张力区VEGF及VEGFR-2表达与正常组相比无明显差别;实验3 d组~14 d组张力区VEGF及VEGFR-2表达均高于正常牙周组织,VEGF的表达峰值出现在14 d组,VEGFR-2的表达在7 d组出现峰值.无论在压力区还是在张力区,VEGF与VEGFR-2的表达均存在正相关关系.结论:在兔正畸牙齿移动过程中牙周组织VEGF及VEGFR-2的表达增强,VEGF与VEGFR-2的表达呈正相关;VEGF及 VEGFR-2参与了正畸牙齿移动过程中牙周组织的改建过程.     

血管内皮生长因子和骨形成蛋白2诱导犬恒牙原位牙髓再生

目的通过选择犬根尖孔发育完成的恒牙建立根尖周炎模型,探索血管内皮生长因子（VEGF）和骨形态生成蛋白2（BMP2）诱导原位牙髓再生的可能性。 方法2只10~ 12月龄的杂种犬,选择根尖孔发育完成的14颗恒前牙建立根尖周炎模型,分别将VEGF（VEGF组）、BMP2（BMP2组）单独和VEGF+BMP2联合（VEGF+BMP2组）与水凝胶复合植入感染控制后的根管腔内,对照组仅植入水凝胶。8周后组织学观察根管内组织再生情况。 结果植入8周后,VEGF组和VEGF+BMP2组根管腔内可见含有大量成纤维样细胞和血管的新生组织形成;而BMP2组和对照组根管腔内见均质状物质,未见细胞、血管形成。 结论VEGF或VEGF+BMP2复合水凝胶支架可以诱导犬根尖发育成熟的根尖周炎患牙在根管腔内生成含有血管的疏松结缔组织。     

CD34和血管内皮生长因子在人牙源性病损中的表达

血管生成在肿瘤的生长和转移中起着重要作用 ,且与肿瘤的病理进展和预后不良密切相关。成釉细胞瘤(ａｍｅｌｏｂｌａｓｔｏｍａ ,ＡＢ)及牙源性角化囊肿 (ｏｄｏｎｔｏｇｅｎｉｃｋｅｒａｔｏｃｙｓｔ,ＯＫＣ)与肿瘤血管生成及微血管密度 (ｍｉｃｒｏｖｅｓｓｅｌｄｅｎｓｉｔｙ ,ＭＶＤ)的关系少见报道。1 .材料与方法 :78例ＡＢ(原发 36例、复发 35例、恶变 7例 )、1 8例ＯＫＣ为中国医科大学口腔医学院与第一附属医院病理科存档蜡块 ,全部病例均有完整临床资料并随访。行ＳＰ法免疫组织化学染色。ＳＰ试剂盒 (超敏 ) ,ＤＡＢ显色剂 ,ＣＤ…     

牙髓中血管内皮生长因子的研究进展

血管内皮生长因子是一种重要的血管生成因子，主要由血管内皮细胞产生。目前研究发现牙髓及牙本质基质中也存在少量的血管内皮生长因子，在细茵脂多糖或脂磷壁酸的诱导下出现反应性增加，可能参与一些生理、病理的调控。本文就VEGF在牙髓中的生物学活性和功能及其研究进展作一综述。     

血管内皮生长因子在血管瘤增殖及血管生成中的作用

血管瘤是婴幼儿最常见的血管良性肿瘤。为了解血管内皮生长因子 (vascularendothelialgrowthfactor,VEGF)在血管瘤增殖和血管生成中的作用 ,我们采用免疫组化技术对不同阶段血管瘤中VEGF、增殖细胞核抗原 (proliferatingcellnuclearantigen ,PCNA )以及微血管密度 (microvasculardensity ,MVD)进行了检测。1.资料与方法 :①武汉大学口腔医学院 1982～ 2 0 0 1年口腔颌面部血管瘤手术切除标本 5 4例经临床和病理检查确诊 ,按Mulliken分类法将其分为增殖期 (2 5例 )、退化期 (18例 )、退化完成期 (11例 )。正常皮肤及口腔黏膜 15例作为…     

Vascular endothelial growth factor receptor-2 expression in the pulp of human primary and young permanent teeth

The purpose of this study was to evaluate the expression of vascular endothelial growth factor receptor-2 (VEGFR-2) in endothelial cells within the dental pulp of human primary and young permanent teeth and the spatial distribution of VEGFR-2-positive cells. Nine sound primary teeth and 4 sound young permanent teeth were evaluated by immunohistochemistry with a human anti-VEGFR-2 antibody. Stained tissue sections were analyzed qualitatively under light microscopy. Here we observed that endothelial cells of both primary and permanent teeth showed positive immunostaining for VEGFR-2. Notably, VEGFR-2-positive cells in the primary teeth tended to be found close to the subodontoblastic layer, whereas the spatial distribution of VEGFR-2 immunostaining in the permanent teeth was more uniform. In conclusion, VEGFR-2 was expressed in the microvascular endothelial cells of both primary and young permanent teeth, which suggests that these cells are capable of responding to the morphogenetic and survival signals mediated by VEGF.     

Vascular endothelial growth factor, fibroblast growth factor 2, platelet derived growth factor and transforming growth factor beta released in human dental pulp following orthodontic force

OBJECTIVE: The release of four diffusible angiogenic growth factors in human dental pulp following orthodontic force was investigated by using neutralising growth factor antibodies (NAs), individually and in four different combinations to block their effects. This study investigated if increasing the number of NAs (anti h vascular endothelial growth factor (VEGF), anti h fibroblast growth factor (FGF2), anti h platelet derived growth factor (PDGF) and anti Transforming growth factor beta (TGFbeta)) in combination resulted in a progressive reduction of the angiogenic response of the pulp. MATERIALS AND METHODS: The dental pulps from two groups of 40 premolar teeth, four teeth from each of 20 patients treated with fixed appliances for 2 weeks, were divided vertically, and sections from each half pulp co-cultured with sections of rat aorta in collagen. In one group, one of each of the four NAs, and in the other group, one of the four different NA combinations were added to the media of the co-cultures from one half of the pulp from each of the four teeth of each patient; the other half pulp co-cultures were controls. Cultures were examined daily by light microscopy for growth and number of microvessels. RESULTS: NAs significantly reduced microvessel numbers in the co-cultures when added individually (P<0.004), and in each of the four combinations (P<0.002), with a trend to progressively reduced microvessel numbers with increasing number of NAs in combination. CONCLUSIONS: Results indicated that all four angiogenic growth factors examined were released following orthodontic force application and play a role in the angiogenic response of the pulp, and that these factors may be more effective in combination.     

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牙外伤包括牙体硬组织损伤、牙髓组织损伤和牙周组织损伤。牙髓损伤常见于牙齿折断、牙齿移位和牙齿全脱出中,可见牙髓损伤几乎在所有的牙齿外伤中都存在。外伤后,牙髓组织的转归可分为牙髓存活、牙髓钙变和牙髓坏死3种。牙髓组织的转归与以下因素有关:(1)外伤冲击力对牙髓组织的损伤;(2)外伤后外界不良刺激;(3)牙齿发育程度、个体差异等。儿童恒牙外伤后牙齿尚处于生长发育中,其治疗和预后远比成人复杂。本文针对年轻恒牙的特点,提出外伤后牙髓损伤判断和处置的对策。     

Vascular endothelial growth factor in human periodontal disease

Vascular endothelial growth factor (VEGF) is a multifunctional angiogenic cytokine of importance in inflammation and wound healing but its presence in chronic inflammatory periodontal disease has never been reported. The aims of this study were to investigate the presence of VEGF in human periodontal tissue and gingival crevicular fluid (GCF) in periodontal health and disease. VEGF in tissue was localized by immunohistochemistry. GCF and unstimulated saliva were collected from patients and clinically healthy subjects and VEGF was assessed by using an ELISA. VEGF was detected within vascular endothelial cells, neutrophils, plasma cells and junctional, pocket and gingival epithelium. In periodontitis patients, the volume of GCF and total amount of VEGF collected from diseased sites were both greater than from clinically healthy sites (Wilcoxon test p <0.01). However, the concentration of VEGF per unit volume of GCF was higher at healthy sites compared with diseased sites (Wilcoxon test p<0.05). Higher concentrations of VEGF were detected in healthy sites in patients compared with similar sites in clinically healthy subjects (Mann-Whitney U-test p <0.05). A logistic regression approach indicated that there was variation in VEGF between subjects (p<0.01), and that age (p<0.05), plaque (p < 0.05) and pocket depth (p < 0.07) were explanatory variables. VEGF was also detected in all saliva samples and was significantly higher in patients than in healthy controls (p<0.05). This study suggests that VEGF could be relevant to angiogenic processes in healthy as well as diseased periodontal tissue and that the periodontal status influences the salivary level of VEGF.