人前磨牙牙髓牙本质复合体的eNOS 、iNOS免疫组化研究

目的：研究内皮型与诱生型一 氧化氮合酶（eNOS与iNOS)在牙髓牙本质复合体的表达，探讨其分布与功能的关系。方法:收集新鲜健康的人前磨牙60个， 固定、脱钙、石蜡包埋、切片,eNOS、iNOS的SABC法免疫组织化学染色。结果：eNOS阳性免疫反应物出现于牙髓血管内皮细胞，部分平滑肌细胞、成牙本质细胞；在部分牙髓血管内皮细胞、平滑肌细胞及神经纤维可见少量iNOS免疫阳性反应物。结论：eNOS在牙髓血管内皮细胞、平滑骨细胞、成牙本质细胞表达、提示eNOS在牙髓血流调节和牙本质的形成中起重要作用；在牙髓牙本质复合体的部分血管内皮细胞、神经纤维有少量iNOS表达，提示少量iNOS可能也参与牙髓牙本质复合体的正常生理功能。     

eNOS在大鼠正畸牙移动中的表达

目的：观察内皮型一氧化氮合酶（endothelial nitric oxide synthase,eNOS）在大鼠正畸牙移动中的表达分布,探讨eNOS在正畸牙牙周组织改建中的意义。方法：通过正畸力牵引大鼠左上颌第一磨牙近中移动,建立大鼠正畸牙移动模型。随机分为9组,每组5只,分别为：实验加力0、3、6、12、24 h和3、5、7、14 d。大鼠右上颌第一磨牙不加力设为自身对照组。制备大鼠正畸牙移动不同时间牙周组织切片,免疫组化方法检测eNOS表达分布。结果：对照组有少量eNOS表达,实验组张力区eNOS阳性表达,且随牙齿移动时间不同表达分布发生变化。3 h组eNOS即开始表达增强,5 d组eNOS阳性表达达到最高峰值,7 d组及14 d组eNOS表达值开始减少。结论：eNOS参与正畸牙移动牙周组织改建。     

eNOS在大鼠正畸牙移动中的表达

目的:观察内皮型一氧化氮合酶(endothelial nitric oxide synthase,eNOS)在大鼠正畸牙移动中的表达分布,探讨eNOS在正畸牙牙周组织改建中的意义.方法:通过正畸力牵引大鼠左上颌第一磨牙近中移动,建立大鼠正畸牙移动模型.随机分为9组,每组5只,分别为:实验加力0、3、6、12、24 h和...     

iNOS在不同年龄段牙髓牙本质复合体中的差异

目的：研究诱导型一氧化氮合酶（iNOS）在各年龄组牙髓牙本质复合体中的表达,探讨其在牙齿衰老中的意义。方法：新鲜健康的不同年龄段人前磨牙120颗,固定、脱钙、包埋、切片、SABC法免疫组织化学染色,图像定量分析与统计学处理。结果：青少年组牙髓牙本质复合体基本无iNOS表达,随年龄增长逐步出现iNOS表达,老年前期组表达开始明显,表达部位为牙髓牙本质复合体内的神经纤维、成牙本质细胞及其在前期牙本质内的突起、血管内皮细胞。阳性免疫反应物的体密度、面数密度、积分光密度在青少年组、中年组与老年前期组、老年组之间有统计学差异。结论：iNOs与牙本质小管老年性矿化无关,与牙髓老年性血供减少、细胞退行形变、牙本质脆性增加有关。     

正畸牙齿移动过程中iNOS的表达及意义

目的:观察诱导型一氧化氮合酶(induc ib le n itric oxide synthase,iNOS)在大鼠正畸牙齿移动引发牙周组织改建过程中的表达,探讨NO/iNOS在正畸牙齿移动中的作用机制。方法:56只雄性SD大鼠随机分为8组。分别在正畸加力1,3,5,7,14,21,28 d后进行免疫组化染色和图像分析。结果:正畸加力3 d后,牙周组织细胞iNOS表达增强,7 d iNOS表达达到高峰(P<0.01),以后iNOS表达下降。结论:NO/iNOS参与了正畸牙周组织改建过程。     

iNOS在大鼠正畸牙牙周膜中的表达

[摘要] 目的 观察诱导型一氧化氮合酶(inducible nitric oxide synthasesi,NOS)在大鼠正畸牙移动牙周膜中的表达分布,探讨iNOS在正畸牙牙周组织改建中的意义。方法 通过正畸力牵引大鼠左上颌第一磨牙近中移动,建立大鼠正畸牙移动模型。随机分为9组,每组5只,分别为:实验加力0 h、3 h、6 h、12 h2、4 h和3 d5、d7、d1、4 d。大鼠右上颌第一磨牙不加力设为自身对照组。制备大鼠正畸牙移动不同时间牙周组织切片,免疫组化方法检测iNOS表达分布。结果对照组有少量iNOS表达,实验组压力区iNOS阳性表达大于张力区,且随牙齿移动时间不同表达分布发生变化。3 d时iNOS即开始表达增强,7 d时iNOS阳性表达达到最高峰值1,4 d时iNOS表达值开始减少。结论 iNOS参与正畸牙移动牙周组织改建。     

牙周炎大鼠正畸牙齿移动中牙周组织内iNOS的表达变化

目的:研究牙周炎大鼠正畸牙齿移动中组织内诱导型一氧化氮合成酶(iNOS)的表达变化。方法:48只10周龄SD大鼠随机分为牙周炎组和正常组,每组24只。近中移动上颌第一磨牙,分别于加力后1、2、3、7、14、21d,2组各处死4只动物,制作切片进行iNOS免疫组织化学染色,观察比较牙周组织中iNOS的表达变化。结果:加力2、3、7、14、21d时,实验组iNOS阳性表达显著高于对照组。结论:大鼠牙周组织炎症使牙齿移动过程中iNOS表达升高,影响牙周组织改建。     

凝血酶受体在人牙髓组织和细胞中表达的免疫组化研究

目的：探讨凝血酶受体在人正常、炎症牙髓组织及体外培养的牙髓成纤维细胞中的表达及其意义。方法：体外培养人牙贿成纤维细胞,收集正常和炎症牙髓组织,采用免疫组织化学方法观察凝血酶受体在牙髓组织和细胞中的表达和分布。结果：体外培养的牙髓成纤维细胞可见受体强阳性表达,正常及炎症牙髓组织中成牙本质细胞层、牙髓细胞、血管内皮细胞均呈广泛的阳性表达,炎症区淋巴细胞、单核细胞、中性粒细胞染色为强阳性。结论：人牙髓组     

牙髓形成过程中微血管分布的免疫组化研究

牙髓微循环在牙髓的生理功能和病理改变中具有重要作用。许多学者通过各种方法试图揭示生理和病理情况下牙髓循环的状态和改变。也有人用血管造影和灌注方法对牙乳头分化和形成牙髓过程中的血管分布进行过研究。现在已广泛用抗血管内皮细胞抗体的免疫组化技术来观察和研究身体其他部位     

大鼠正畸牙齿移动过程中Smad1的表达和意义

目的：探讨BMP超家族的细胞内信号转导分子Smad1蛋白在大鼠正畸牙齿移动过程中牙周组织的分布和表达。方法：用ABC免疫组织化学法，检测实验性大鼠正畸牙齿移动过程中牙周组织Smad1的表达。结果：Smad1在正畸牙齿加力各个时期存在的特异的分布模式，与BMP有相似之处。结论：Smad1参与了大鼠正畸牙齿移动过程，可能介导了BMP在正畸牙齿加力区的信号。     

2种盖髓剂直接盖髓后大鼠牙髓诱导型一氧化氮合酶的表达变化

目的 观察氢氧化钙(CH)和矿物三氧化物凝聚体(MTA)在大鼠磨牙直接盖髓后诱导型一氧化氮合酶(iNOS)的表达变化.方法 42只雌性Wistar大鼠双侧上下第一磨牙分别用CH和MTA直接盖髓,在观察时点即刻,1、3、7、14、21、28 d处死动物取材,进行iNOS免疫组织化学染色,用图像分析软件测定各组标本中iNO...     

Expression of inducible nitric oxide synthase and heat shock proteins in periapical inflammatory lesions

BACKGROUND: The mechanisms responsible for activation and proliferation of lining epithelium involved in inflammatory processes in periapical inflammatory lesions remain unclear. In this study, the expression and distribution of inducible nitric oxide synthase (iNOS) and heat shock proteins (HSPs) were immunohistochemically investigated in periapical inflammatory lesions. METHODS: Control specimens of periodontal ligaments including Malassez epithelial rests from seven teeth and periapical inflammatory lesions (15 apical granulomas (AGs), 16 radicular cysts (RCs), and 10 residual radicular cysts (RRCs)) were prepared and examined by the standard streptavidin-biotin peroxidase complex method using anti-iNOS rabbit polyclonal antiserum, and anti-HSP27, -HSP60, -HSP70 mouse monoclonal antibodies. RESULTS: Immunoreactivity for iNOS was detected in macrophages, lymphocytes, and endothelial cells of granulation tissue and in lining epithelium of periapical inflammatory lesions. Malassez epithelial rests showed no or slight staining for iNOS. The epithelial staining intensity of iNOS in RCs was greater than that in Malassez epithelial rests and RRCs. Immunoreactivity for HSP27 was recognized in inflammatory cells, endothelial cells and lining epithelium of periapical inflammatory lesions and in Malassez epithelial rests. HSP60 was detected in some lymphocytes of granulation tissue and in lining epithelium of periapical inflammatory lesions, whereas Malassez epithelial rests showed no staining for HSP60. Epithelial HSP60 reactivity was more intense in RCs than in RRCs. HSP70 was expressed in lymphocytes, endothelial cells and lining epithelium of periapical inflammatory lesions and in Malassez epithelial rests. The staining intensity of HSP70 in Malassez epithelial rests was slightly lower than that in lining epithelium of RCs and RRCs. CONCLUSIONS: These data demonstrate that the expressions of iNOS, HSP60, and HSP70 are involved in inflammatory processes and might play a role in the activation and proliferation of lining epithelium, leading to progression of periapical inflammatory lesions.     

Effects of an inducible nitric oxide synthase inhibitor on experimentally induced rat pulpitis

Nitric oxide (NO) is a biological effector molecule involved in a large variety of reactions and, as synthesized by inducible nitric oxide synthase (iNOS), has many important roles in inflammatory conditions. This study aimed to evaluate the anti-inflammatory effects of an iNOS-specific inhibitor, N-(3-(aminomethyl)benzyl)acetamidine (1400W), on experimentally induced rat pulpitis in the upper incisors of 6-wk-old male Wistar rats. 1400W (1 mg kg(-1)), the non-specific NOS inhibitor N(G)-nitro-L-arginine methyl ester (L-NAME, 50 mg kg(-1)), or sterile saline (control) were administered before the application of lipopolysaccharide (LPS). Rats were killed 3, 6, 9, 12, 24, 48, and 72 h after LPS application, and immunocompetent cells were detected immunohistochemically. The numbers of granulocytes infiltrating into the pulp were significantly depressed in the 1400W group compared with the saline and L-NAME groups. The kinetics of the macrophages and Ia(+) cells in the 1400W group were similar to those in the L-NAME group, while the maximum numbers in both groups were significantly reduced compared with those in the saline group. These results suggest that NO may be responsible for the infiltration of immunocompetent cells in the progress of pulpitis, and that 1400W is a promising candidate for controlling pulpal inflammatory reactions.     

诱导型一氧化氮合酶在颌骨肉瘤中的表达及意义

目的：研究诱导型一氧化氮合酶（iNOS）在颁骨肉瘤中的表达情况及其和肿瘤血管形成、临床病理特征之间的关系。方法：应用S-P免疫组织化学法检测iNOS和CDB4在颌骨肉瘤中的表达。结果：颌骨肉瘤中存在iNOS的过度表达;iNOS表达与微血管密度有关;iNOS表达与颌骨肉瘤大小、病理分级、临床分期、初／复发等临床病理特征有关,与肿瘤的转移无关。结论：iNOS有促进颌骨肉瘤中肿瘤血管形成的作用,iNOS是肿瘤治疗的一个重要靶点。     

Immunohistochemical analysis of inducible nitric oxide synthase (iNOS) and heat shock proteins (HSPs) in ameloblastomas

BACKGROUND: To clarify the possible role of nitric oxide (NO) and stress proteins in oncogenesis and cytodifferentiation of odontogenic epithelium. Inducible NO synthase (iNOS) and heat shock proteins (HSPs) were analyzed in ameloblastomas as well as in tooth germs. METHODS: Specimens of seven tooth germs, 36 benign ameloblastomas and five malignant ameloblastomas were examined by immunohistochemistry using antibodies against iNOS and 27-, 60- and 70-kDa HSPs (HSP27, HSP60 and HSP70). RESULTS: Immunoreactivity for iNOS was detected in normal and neoplastic odontogenic epithelial cells and was higher in malignant ameloblastomas than in tooth germs and benign ameloblastomas. HSP27 was expressed constitutively in all odontogenic epithelial cells in tooth germs and benign and malignant ameloblastomas. Expression of HSP60 and HSP70 was detected in normal and neoplastic odontogenic epithelial cells and was prominent in cells neighboring the basement membrane. HSP60 reactivity showed no apparent difference between normal and neoplastic odontogenic epithelium, whereas HSP70 expression was slightly higher in benign and malignant ameloblastomas than in tooth germs. CONCLUSIONS: Activation of iNOS might be associated with malignant potential of epithelial odontogenic tumors. Elevated expression of HSP70 is considered to be involved in neoplastic transformation of odontogenic epithelial cells.     

Co-production of vascular endothelial cadherin and inducible nitric oxide synthase by endothelial cells in periapical granuloma

AIM: To clarify the mechanisms of inflammatory cell migration in human periapical granulomas by examining vascular endothelial (VE) cadherin and inducible nitric oxide synthase (iNOS)-producing cells. METHODOLOGY: Periapical tissues were obtained from patients during endodontic surgery and were divided into two portions. After fixing the tissues with acetone or 4% paraformaldehyde in phosphate-buffered saline, 5-microm-thick paraffin or cryostat sections were prepared, respectively. The paraffin sections of the inflamed tissues were evaluated histologically with haematoxylin-eosin stains. Cryostat sections of the tissue, diagnosed as periapical granulomas, were then examined by either immunohistochemistry using anti-human VE-cadherin or iNOS antibodies (Abs) for the characterization of infiltrating cells. In addition, co-localization of VE-cadherin and iNOS production was also analysed by two-colour immunofluorescence image analysis. RESULTS: Endothelial cells were strongly stained with iNOS Abs. Macrophages, lymphocytes, polymorphonuclear leucocytes and fibroblasts also exhibited iNOS production. These iNOS-positive cells accumulated around the blood vessels. On the other hand, VE-cadherin production was exhibited in only endothelial cells. Two-colour immunofluorescence image analysis using VE-cadherin and iNOS Abs demonstrated that iNOS-producing endothelial cells also showed VE-cadherin production. CONCLUSIONS: Vascular endothelial-cadherin produced by endothelial cells could be regulated by iNOS-producing cells in periapical granulomas and might play a pivotal role in vascular permeability.