表皮生长因子对口腔溃疡愈合的促进作用及机理探讨

目的:观察表皮生长因子对口腔溃疡的促愈合作用及其受体在溃疡愈合过程中的表达变化方法:金黄地鼠125只随机分成3组,实验组采用EGF,对照组采用生理盐水局部喷涂,以正常动物组作为基线对照.观察溃疡愈合天数、溃疡面积变化及局部组织EGFR的表达改变.结果:实验组EGF可有效促进溃疡愈合,创面愈合率显著高于对照组;并且局部新生组织EGFR表达显著高于对照组,至溃疡愈合时恢复至正常动物水平结论:EGF可通过刺激局部组织EGFR的表达从而促进口腔溃疡愈合.     

表皮生长因子与干燥综合征伴发萎缩性舌炎的相关性研究

目的： 探讨表皮生长因子(epidermal growth factor,EGF)及其受体（EGF receptor,EGFR)与干燥综合征（Sjögren’s syndromes,SS)伴发萎缩性舌炎（atrophic glossitis,AG)的相关性及可能的作用机制。方法：干燥综合征患者按未伴发与伴发轻、中、重度萎缩性舌炎分为4组,健康成年人为对照组,应用ELISA法检测唾液中的EGF含量,SP免疫组化技术检测舌上皮细胞中EGFR的表达情况,采用SPSS19.0软件包进行统计学处理。结果：干燥综合征未伴发及伴发萎缩性舌炎组唾液EGF浓度均显著低于正常对照组(P<0.01),2组之间差异显著（P=0.024）,干燥综合征伴发轻、中、重萎缩性舌炎组唾液EGF水平逐渐降低,两两比较差异显著（P<0.05）;干燥综合征伴发中、重度萎缩性舌炎组舌上皮细胞EGFR表达较正常对照组显著降低（P=0.009,P=0.037）,其余2组与对照组之间差异无显著性;舌背黏膜萎缩程度与唾液EGF水平显著相关（r=-0.673,P<0.01）。结论：干燥综合征患者唾液中表皮生长因子浓度明显降低,且与其伴发萎缩性舌炎有密切相关性。     

表皮生长因子及其受体在口腔黏膜上皮异常增生和口腔鳞癌中的表达

目的 探讨表皮生长因子(epidermal growth factor,EGF)及其受体(epidermal growth factor receptor,EGFR)与口腔黏膜癌变的关系.方法 ①以30例健康成年人唾液样本为对照,通过放射免疫法对12例上皮异常增生患者、40例口腔鳞癌(oral squamous cell carcinoma,OSCC)患者唾液EGF含量进行测定分析.②采用免疫组化法检测10例正常口腔黏膜,16例上皮异常增生,30例OSCC上皮组织中EGFR的表达水平.结果 ①上皮异常增生组唾液EGF含量[(5.12±4.30)μg/L]显著高于口腔鳞癌[(2.35±1.00)μg/L]和正常对照组[(2.18±1.02)μg/L](P<0.01),OSCC和正常对照组无显著性差异.②上皮异常增生组织中EGFR的表达高于正常黏膜(P<0.05).OSCC中EGFR的表达显著高于正常黏膜(P<0.01).OSCC组和上皮异常增生组织中EGFR的表达无显著性差异.结论 EGF和EGFR可能参与口腔黏膜癌变的早期阶段.     

表皮生长因子受体蛋白和基因在口腔复发性阿弗他溃疡中表达的变化及意义

目的　观察表皮生长因子受体 (EGFR)在口腔复发性阿弗他溃疡 (RAU)组织中蛋白和基因表达变化。方法　用免疫组化和RT PCR技术检测EGFR在RAU中表达的变化。结果　RAU组织中EGFR的mRNA表达明显下降 (P <0 .0 5 )。EGFR在正常黏膜和RAU中表达水平较低 ,阳性表达位于细胞膜、胞质 ,正常黏膜中表达主要位于基底细胞层中。在RAU中该蛋白表达水平明显降低 (P <0 .0 5 )。结论　RAU中的EGFR表达受抑 ,这可能与RAU的发病机制有着密切的联系     

复方表皮生长因子膜治疗家兔口腔溃疡的实验研究

目的研制治疗口腔粘膜溃疡的膜性制剂,观察其疗效.方法以表皮生长因子(EGF)为主药制成EGF膜,通过治疗家兔口腔溃疡,观察其病理改变及愈合时间.结果EGF膜组溃疡愈合时间较对照组明显缩短(P＜0.01),EGF膜组溃疡愈合程度明显好于对照组.结论EGF膜有明显促进家兔口腔溃疡愈合的作用.     

表皮生长因子对Balb/3T3成纤维细胞生长周期及表皮生长因子受体表达的影响

目的:观察表皮生长因子(Epidermal growth factor,EGF) 对Balb/3T3成纤维细胞生长周期及表皮生长因子受体(Epidermal growth factor receptor,EGFR)表达的影响.方法:①通过血清饥饿法使细胞同步化,加入25 ng/ml的EGF予以刺激,用流式细胞仪检测不同时间细胞生长周期参数的改变;②于不同时间点对Balb/3T3细胞进行EGFR免疫组化染色,观察EGF对EGFR表达的调节作用. 结果:①Balb/3T3细胞在加入EGF 8 h后S期细胞比例及增殖指数达到最高峰,至10 h回落至原水平;②EGF在作用早期可促进成纤维细胞EGFR表达,其对受体表达的调节作用与正常培养液相当.结论:EGF可有效促进EGFR的表达,从而促进细胞增殖.     

正畸力作用下大鼠牙周组织中表皮生长因子的表达

目的 检测正畸力作用下大鼠牙周组织中表皮生长因子（epidermal growth factor,EGF)及其受体的表达与分布，探讨EGF在正畸牙移动过程中的作用及机制。方法 建立大鼠正畸牙移动模型，分别在受力24h及168h处死，制备左侧上颌第一磨牙及牙周组织的石蜡标本，采用免疫组化HI－SABC法进行检测。结果 EGF与EGFR在正畸组大鼠牙周组织中的表达明显强于对照组（P＜0.01)，受力168h组EGF及EGFR表达的强度高于受力24h组（P＜0.01)；同时间组中，张力侧EGF及EGFR的表达高于压力侧（P＜0.01)；EGF、EGFR在正畸组中的表达主要是位于近远中向的张、压力侧，而生理状态下主要位于根尖及根分叉区的牙周膜。结论 正畸牙移动过程中EGF、EGFR的表达有所增强，提示EGF可能参与了正畸牙移动，并且更多地促进了正畸牙骨改建中的骨形成过程。     

表皮生长因子在牙齿萌出通道形成中的作用研究

目的:研究表皮生长因子(EGF)在牙齿萌出过程中,是否参与软、硬组织通道的形成。方法:①免疫组化法检测表皮生长因子及其受体在出生后13、15 d以及成年小鼠下颌第一磨牙萌出部位口腔黏膜的表达变化;②原代培养Wistar大鼠牙囊细胞,选择生长良好的第3代细胞,MTT法筛选EGF作用于牙囊细胞的较佳效应浓度。将第3代牙囊细胞以1×105/孔接种到培养皿中,加入最佳浓度的EGF孵育0.5、1、3、6 h后,Trizol一步法分别提取总RNA,采用反转录聚合酶链反应(RT-PCR)检测同一浓度的EGF作用不同时间后,牙囊细胞MCP-1 mRNA的表达变化。结果:①牙萌出时,EGF在萌出牙齿冠方黏膜的上皮层呈弱阳性表达,表皮生长因子受体(EGFR)在口腔上皮全层呈强阳性表达。而牙萌出后,EGF的表达集中于口腔黏膜的固有层,EGFR的表达集中于上皮基底层;②在EGF浓度为5～10 ng/mL时,对牙囊细胞的增殖具有明显促进作用(P<0.05),其中10 ng/mL促进作用最强。牙囊细胞与10 ng/mL的EGF共同孵育0.5、1、3、6 h均能明显促进牙囊细胞MCP-1 mRNA的表达(P<0.05),其中3 h时促进作用最强,以后逐渐恢复,但仍比对照组高(P<0.05)。结论:EGF及其受体可能促进萌出牙齿冠方实性上皮团的形成;适当浓度的EGF能显著增加牙囊细胞的增殖活性,并上调牙囊细胞中MCP-1 mRNA的表达。     

表皮生长因子及受体在牙齿萌出时的表达及意义

目的观察萌出前后,表皮生长因子(EGF)及受体(EGFR)在口腔粘膜中的表达,探讨EGF在牙齿萌出时软组织通道形成中可能发挥的作用。方法免疫组化法检测牙齿萌出过程中,表皮生长因子及其受体在牙萌出部位口腔粘膜的表达变化。结果牙齿萌出时,EGF在萌出牙齿冠方粘膜的上皮层呈弱阳性表达,EGFR在口腔上皮全层呈强阳性表达。而牙齿萌出后,EGF的表达集中于口腔粘膜的固有层,EGFR的表达集中于上皮基底层。结论表皮生长因子及其受体可能促进萌出牙齿冠方实性上皮团的形成,从而参与软组织通道的建立。     

表皮生长因子治疗老年人放射性口腔溃疡的临床疗效

放射性口腔溃疡在老年人头颈部肿瘤放射治疗过程中发生率较高,可能影响放疗的顺利进行。我们将表皮生长因子（Epidermal Growth Factor,EGF）用于治疗老年人放射性口腔溃疡取得较好疗效。     

口腔扁平苔藓组织中表皮生长因子及其受体表达变化的研究

目的探讨表皮生长因子(EGF)、表皮生长因子受体(EGFR)及两种原癌基因c-fos、c-jun,在口腔扁平苔藓中的基因表达、蛋白含量变化及其生物学意义。方法选择新鲜组织标本31例,包括糜烂型扁平苔藓10例、网状型扁平苔藓12例和正常口腔黏膜9例,使用逆转录聚合酶链反应技术(RT-PCR)检测EGF、EGFR、c-fos和c-jun基因在不同组织中的表达;同时使用免疫组化方法比较这4种蛋白在不同组织中的定位和表达量的变化。结果糜烂型扁平苔藓EGFR基因的mRNA和蛋白含量分别为(55.9±23.1)%、(71.1±10.1)%,均明显高于网状型扁平苔藓及正常口腔黏膜组织(P<0.05)。糜烂型扁平苔藓中的c-fos和c-jun基因表达呈相同的变化规律,两种基因的mRNA含量均显著高于正常口腔黏膜。糜烂型扁平苔藓的C-fos、C-jun蛋白的阳性细胞率分别是正常黏膜的1.3和1.5倍,蛋白含量明显高于正常口腔黏膜(P<0.01)。结论糜烂型扁平苔藓的癌变率可能大于网状型扁平苔藓,其中EGF及其受体引导的信号传导通路可能起着十分重要的作用。     

Salivary levels of vascular endothelial growth factor (VEGF) in recurrent aphthous ulceration

BACKGROUND: Vascular endothelial growth factor (VEGF) is a multifunctional angiogenic cytokine involved in angiogenesis and wound healing. Its presence in recurrent aphthous ulceration has not been reported to date. The aim of this study was to investigate the association of salivary levels of VEGF with various stages of recurrent aphthous ulceration (RAU). METHODS: VEGF levels were determined in a group of 27 age and sex-matched healthy controls and in 30 patients with minor and major RAU grouped into the three stages: (I) early active stage, (II) active stage, and (III) remission period. VEGF levels (pg/ml; mean +/- SD) in unstimulated whole saliva were determined by enzyme immunoassay. RESULTS: Patients with major RAU - stages I and II - had decreased VEGF values (765 +/- 458 and 341 +/- 109, respectively) when compared both to healthy controls (1652 +/- 567; P < 0.01) and to stage III major RAU (1524 +/- 784; P < 0.005). CONCLUSION: Salivary VEGF levels seemed to be associated with ulcer development in major RAU, showing stage-dependent alterations during the course of this disorder.     

Increased rate of salivary epidermal growth factor secretion in patients with juvenile periodontitis

We compared salivary epidermal growth factor (EGF) concentrations in patients with juvenile periodontitis (JP) and periodontally healthy controls. In initial screening of 45 JP patients and a group of healthy controls, significantly higher salivary EGF concentrations were measured in the JP patients. Subsequently, 17 JP patients who had high EGF concentrations in some of their salivary samples were chosen, and a group of age- and sex-matched controls was selected. We then examined their EGF concentrations and EGF secretion rates under standardized conditions in stimulated and unstimulated saliva and studied the expression of EGF receptor (EGF-R) in their gingival tissues. The results showed that the mean EGF concentration (pmol/ml) was slightly higher in JP patients than in controls. However, the difference was statistically significant only in stimulated saliva and when calculated per milligram salivary protein. When EGF release was measured as the rate of EGF secretion (pg/min), significantly higher values were observed in JP patients than in controls both in unstimulated and stimulated saliva. Immunofluorescence microscopy (IF) of gingival samples from JP patients and their controls revealed no quantitative or qualitative differences in the expression of EGF-R. Our results demonstrate the complex nature of salivary EGF release. The elevated rate of salivary EGF secretion in JP patients may be associated with the pathogenetic mechanisms of juvenile periodontitis.     

Secretion of epidermal growth factor in parotid saliva in diabetic patients: role of autonomic innervation

Parotid saliva was collected over a 12-min period from 24 insulin dependent diabetic patients with varying degrees of autonomic neuropathy and 12 age and sex matched non-diabetic controls. Epidermal growth factor (EGF) concentrations in saliva were measured by radio-immunoassay. The EGF concentrations in diabetics with no autonomic neuropathy or with combined autonomic neuropathy were equivalent but secretion of EGF was significantly elevated at the 6- and 12-min periods of collection in diabetic patients with early or established autonomic neuropathy. It is postulated that when parasympathetic autonomic neuropathy is present a relative "over-activity" of the sympathetic innervation promotes release of salivary EGF. This sympathetic predominance may maintain salivary EGF concentration despite the elevated salivary flow and volume which is associated with parasympathetic autonomic neuropathy.     

bFGF基因在复发性阿弗他溃疡中表达的变化及其意义

目的 观察碱性成纤维细胞生长因子(bFGF)在复发性阿弗他溃疡(RAU)组织中基因表达变化规律.方法 分别提取正常口腔粘膜和RAU组织中的总RNA,分离mRNA,用RT-PCR技术检测bFGF基因在其中的表达变化规律.结果 在正常口腔粘膜组织中bFGF的mRNA表达较弱,而在RAU中表达水平增加(P＜0.05).结论 RAU中的bFGF基因表达水平增强,这可能与RAU病程中黏膜的修复愈合有着密切的联系.     

Decreased levels of salivary prostaglandin E2 and epidermal growth factor in recurrent aphthous stomatitis

Prostaglandin E₂ and epidermal growth factor are two important cytoprottective compounds in saliva. This study investigated their salivary levels in controls and individuals with minor recurrent aphthous stomatitis. The development of recurrent aphthous stomatitis was divided into three stages: (1) early active stage (mucosal redness); (2) active stage (mucosal ulceration); (3) convalescent stage. Unstimulated mixed saliva was collected from each volunteer. Salivary prostaglandin E₂ and epidermal growth factor concentrations were determined by radioimmunoassay. Their levels (mean ± SEM) were significantly lower during the active stage of ulceration as compared to the control: (a) for prostaglandin E₂, 200 ± 55 versus 73 ± 11 pg/mg salivary protein (p < 0.01), 447 ± 123 versus 112 ± 19 pg/ml saliva (p < 0.01), 215 ± 30 versus 63 ± 12 pg/min salivary flow (p < 0.01), control (n = 12) versus active stage (n = 15); (b) for epidermal growth factor, 1.09 ± 0.17 versus 0.67 ± 0.17 ng/mg salivary protein (p < 0.05); 2.51 ± 0.53 versus 0.84 ± 0.19 pg/ml saliva (p < 0.05, 1.24 ± 0.26) versus 0.41 ± 0.09 pg/min salivary flow (p < 0.05), control (n = 12) versus active stage (n = 12). Salivary prostaglandin E₂ and epidermal growth factor showed stage-dependent alterations during the development of the stomatitis. The prostaglandin E₂ concentration decreased significantly during the active stage of ulceration, and then increased significantly during the convalescent stage. However, the recovery of salivary epidermal growth factor after the ulceration was slower than that of the prostaglandin E₂. It is suggested that the diminution of prostaglandin E₂ and epidermal growth factor in the saliva may be associated with the ulcer development.