共查询到18条相似文献,搜索用时 47 毫秒
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眼免疫赦免与免疫偏离 总被引:2,自引:0,他引:2
在具有免疫活性的个体 ,如果在某一特殊解剖部位接种或移植具有免疫原性的细胞或组织 ,这些细胞或组织可以长期存活 ,那么我们将这一部位称为免疫赦免部位 [1 ] 。目前已发现的免疫赦免部位有眼、脑、肝脏、某些内分泌器官、母胎界面和仓鼠的颊袋等。其中眼的免疫赦免现象更为人们所关注 ,本文旨在就眼免疫赦免的研究进展加以综述。1 眼的免疫赦免许多现象表明 ,眼内腔是一个典型的免疫赦免部位。其主要依据有 :(1)将同种异体肿瘤细胞植入 BAL B/ c小鼠眼前房不被排斥 ,且呈进行性生长。与此相反 ,将同样的肿瘤细胞注射到非赦免部位 (如… 相似文献
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在所有器官移植中,角膜移植是成功率最高的手术[1],这与角膜特异的免疫赦免状态有关。近年来,对角膜免疫赦免机制的研究取得了一些新的进展,现综述如下。1 角膜的局部解剖因素1.1 正常角膜组织内缺乏血管和淋巴管[2],这在一定程度上阻止了免疫系统对移植抗原的识别,并限制了血源性免疫效应细胞和分子进入移植的角膜组织。1.2 角膜Langerhans细胞(Lc)的分布 Lc是广泛分布于皮肤表皮组织和角膜中的带有Ia 抗原的细胞,有白细胞共同表面标志而不含单核/巨噬细胞标记,具有很强的抗原递呈功能,与免疫排斥反应的关系十分密切[3,4]。He等[5]实… 相似文献
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碱烧伤对眼前房免疫赦免状态的削弱和破坏 总被引:6,自引:4,他引:2
目的观察碱烧伤后眼免疫赦免状态的改变。方法使用0.5mol/LNaOH在兔眼建立碱烧伤模型。通过胸腺细胞刺激反应检测碱烧伤后不同时间房水的免疫抑制水平。另外,观察了碱烧伤对前房相关免疫偏离(ACAID)的支持能力。结果碱烧伤后眼房水的正常免疫抑制效应显著下降,即使在碱烧伤后2个月。烧伤眼接种抗原后ACAID诱导失败。结论碱烧伤后角膜移植免疫排斥反应的高发率除与植床的高度血管化和炎症背景外,眼前房免疫赦免机制的破坏或削弱也可能起着重要的作用 相似文献
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张移 《国外医学:眼科学分册》2000,24(6):321-325
免疫赦免是眼免疫系统的一个重要特征,而前房相关性免疫偏离是眼免疫赦免的中心部分。本文总结近年来关于两者的研究成果,较全面地介绍两者形成的生理基础及免疫机制,尤其是一些细胞因子如TGF-β的重要作用,进一步阐明了眼免疫赦免及前房相关性免疫偏离的本质。研究眼免疫赦免及前房相关性免疫偏离具有重要的临床意义,目前已应用于自身免疫性葡萄膜炎的治疗、高危角膜移植、视网膜色素上皮移植排异机制的研究及防治。 相似文献
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GATA-3在鼠前房相关免疫偏离形成中的作用 总被引:1,自引:0,他引:1
目的 探讨GATA-3在前房相关免疫偏离(anterior chamber associated deviation,ACAID)形成中的作用。方法 分别将视网膜光感受器间维生素A类结合蛋白(interphotoreceptor retinoid binding protein,IRBP)及其与完全弗氏佐剂混合液注入Wistar大鼠前房及鼠右后足垫内免疫动物,皮内注射IRBP观察迟发型超敏反应。分别于鼠前房内注射IRBP后的3、5、7、14和21d及发产右后足垫内注射IRBP和完全弗氏佐剂混合液后14d时处死动物,取其脾脏,采用免疫组织化学方法行单、双染色,对转录因子GATA-3的阳性表达细胞行免疫组织化学染色及Western blot法检测,观察GATA-3在细胞中的表达水平。结果 正常大鼠脾脏组织细胞中,有少量GATA-3表达,前房注射IRBP的第5、7、14及21dGATA-3表达量显著增高(P<0.01)。表达GATA-3的细胞主要是CD4^+T淋巴细胞。结论 GATA-3表达的增加早于ACAID的形成时间(7d),提示GATA-3参与了ACAID形成,它可能通过激活Th2细胞而发挥作用。 相似文献
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目的 确立视网膜下腔是否具有支持针对视网膜可溶性抗原(S抗原)刺激诱导偏离式免疫反就原能力,并观察白细胞介素-1(IL-1)对视网膜下腔免疫特性的影响。方法 将视网膜S抗原接种于Wistar大鼠的眼前房和视网膜下腔。抗原接种后7天,使用S原接种于Wistar大鼠的眼前房和视风膜下腔。抗原接种后7天,使用S抗原和完全福氏佐免疫受主动物。然后,通过足部刺激评估迟发型超敏反应(DTH)。通过腹腔注射IL 相似文献
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眼的免疫赦免卢因于眼自身对全身免疫反应诱导和表达的修饰。将抗原接种于眼前房可以诱导一种偏离形式的全身性免疫反应,称为前房相关免疫偏离。ACAID的主要特征是:(1)怕特异性迟发型超敏反应和补体结合性抗体反应的缺陷;(2)产生独特的调节性T细胞亚群。 相似文献
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前房相关的免疫偏离及其生物学意义 总被引:1,自引:1,他引:0
前房相关的免疫偏离及其生物学意义杨培增综述 龚向明,李绍珍 审校(中山医科大学中山眼科中心广州510060)于前房内植入异体组织后,血清中出现特异性抗体,并诱导出细胞毒T细胞的前体细胞,但不能诱发出迟发型过敏反应,这种现象被叫做前房相关的免疫偏离(a... 相似文献
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目的实验性自身免疫性前葡萄膜炎(EAAU)是研究人前葡萄膜炎的有用模型。本研究旨在观察前房相关免疫偏离(ACAID)能否阻止EAAU发生。方法将溶于磷酸盐缓冲液(PBS)的牛黑色素蛋白(BMP)注射于大鼠右眼前房;对照组动物仅注射PBS。7d后,使用添加完全福氏佐剂(CFA)的BMP和百日咳毒素免疫所有动物。通过临床观察和组织病理学检测葡萄膜炎的严重程度和发病率。通过由注射BMP刺激的足垫水肿反应评估迟发型超敏反应(DTH)。结果与对照组相比,预先眼内注射BMP的大鼠,其EAAU的严重程度和发病率减低,且DTH反应受到显著抑制。结论这些资料提示ACAID可以用来阻止EAAU的发生。 相似文献
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Purpose: We recently found that loss of anterior chamber-associated immune deviation was associated with normal pregnancy in rabbits. The purpose of this study is to further investigate whether the same events occurred in nonhuman primates. Methods: Mid-pregnant cynomolgus monkeys were randomly selected. Bovine serum albumin (BSA) was inoculated in anterior chamber of eyes of nonpregnant and mid-pregnant monkeys that were subsequently immunized with BSA in adjuvant. Delayed-type hypersensitivity (DTH) was assessed by skin challenge.Results: Non-pregnant monkeys of intracameral BSA proved able to acquire antigen-specific suppression of delayed-type hypersensitivity. By contrast, inoculation of BSA to anterior chamber of pregnant monkeys abolished the DTH-suppression effect. Conclusions: This is the first demonstration in primates that loss of anterior chamber-associated immune deviation occurred during normal pregnancy. The fluctuations of systemic hormone levels during normal pregnancy might influence l 相似文献
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Takeuchi M Keino H Suzuki J Usui Y Hattori T Takeuchi A Oh-I K Okunuki Y Kezuka T Usui M 《Experimental eye research》2006,83(4):981-988
Murine macrophages treated with TGF-beta2 are capable of inducing anterior chamber-associated immune deviation (ACAID), and these macrophages are characterized by impaired IL-12 production and CD40 expression, consequently failing to promote Th1 cell differentiation. In this study, we investigated whether human monocytes can also acquire the specific functions by TGF-beta2 treatment, even when the monocytes are isolated from patients with Behcet's disease (BD). Adherent monocytes isolated from peripheral blood mononuclear cells (PBMC) of 16 BD patients and 16 healthy controls, were cultured overnight with or without 5 ng/ml of TGF-beta2. Then, TGF-beta2-treated or untreated adherent cells were co-cultured with allogeneic CD4(+) T cells obtained from healthy subjects. TGF-beta2 treatment inhibited the abilities of adherent monocytes obtained from BD patients to stimulate the proliferation and IFN-gamma production of allogeneic CD4(+) T cells. The reduced IFN-gamma production was also confirmed by IFN-gamma mRNA expression in the co-cultured T cells. IL-12 production and CD40 molecule expression by adherent monocytes obtained from BD patients were strikingly reduced by TGF-beta2 treatment. These results suggest a possibility that adherent monocytes isolated from BD patients may acquire a property to induce ACAID by treatment with TGF-beta2. 相似文献
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目的 观察角膜抗原和角膜移植片诱导前房相关免疫偏离的可能性。方法 分别将角膜抗原和带有完善内皮层的角膜移植片接种于新西兰兔眼结膜下和前房。7天后,使用添加完全弗氏佐剂的角膜抗原或植片供体脾细胞免疫动物。1周后,评估抗原特异性迟发型超敏反应的诱导情况。 相似文献
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Immune responses to cellular antigens placed in the anterior chamber of the eye are deviant: antibodies and cytotoxic T cells are generated, but delayed hypersensitivity is impaired. To determine whether a similar pattern of unusual reactivity would be induced by soluble antigens placed in this privileged site, we have examined the systemic immune responses of mice to anterior chamber injections of bovine serum albumin and bovine retinal S antigen--both soluble molecules. Recipients of intraocular injections of these antigens without adjuvant developed no detectable systemic immune response. When BSA was mixed with complete or incomplete Freund's adjuvant and injected into the anterior chamber, recipients produced serum specific antibodies; however, they displayed impaired delayed hypersensitivity. Anterior chamber recipients of soluble antigens subsequently proved refractory to the development of delayed hypersensitivity when immunogenic doses of the same antigens were placed subcutaneously. Moreover, the inability to mount delayed hypersensitivity could be adoptively transferred with spleen cells from animals that had previously received intraocular injections of bovine albumin or S antigen. It is concluded that soluble antigens, as well as surface membrane-bound antigens, are capable of inducing anterior chamber-associated immune deviation (ACAID). The possibility is discussed that the capacity of soluble retinal S antigen to induce ACAID may be pertinent to the maintenance of self-tolerance to this autologous, intraocular molecule. 相似文献
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脾脏在不同种类动物前房相关免疫偏离诱导和维持中的作用 总被引:1,自引:0,他引:1
目的 脾脏在小鼠前房相关免疫偏离(anjterior chamber-associated immune deviation,ACAID)的诱导中起着重要的作用。在前房接种抗原4天内摘除脾脏可以消除免疫偏离而导致免疫反应。本研究旨在观察脾脏在其他种类动物ACAID的诱导和维持中的作用。方法 在脾脏切除和假性脾脏切除后,使用牛血清白蛋白(bovine serum albumin,BSA)作为可溶性抗 相似文献