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目的探讨颈浅淋巴结在角膜移植免疫中的作用,为抑制移植术后的免疫排斥反应提供新的思路。方法建立大鼠同种异体角膜移植模型,24只SD鼠为受体,12只Wistar鼠为供体,所有大鼠均为雌性。受体鼠再分为A、B、C、D4组,A组为正常角膜移植组,B组为正常角膜移植合并颈浅淋巴结切除组,C组为高危角膜移植组,D组为高危角膜移植合并颈浅淋巴结切除组。每组均为6只,其中1只于术后14d行植片病理学检查及巨噬细胞免疫组化染色。对各组角膜存活情况进行评分比较,评价疗效。结果各组植片存活时间分别是(10.40±1.14)d、(46.30±9.46)d、(7.00±1.58)d和(15.00±3.39)d。植片存活时间B组较A组、C组,D组较C组均明显延长,差异均具有显著性意义(P<0.05)。结论颈浅淋巴结在大鼠角膜移植免疫中起着非常重要的作用,颈浅淋巴结切除术能有效抑制正常及高危角膜移植术后的免疫排斥反应。 相似文献
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Immunological rejection is the major cause ofcorneal allograft failure. Looking for safe and fea sible therapies to inhibit the rejection is vital inclinical practice. Yamagami[1] succeeded to inhibitcorneal allograft rejection of rats with failure in theinduction of delayed type hypersensitivity (DTH)reactivity by bilateral cervical lymphadenectomy.However, this therapy may be associated with se rious surgical trauma and complication. On the ba sis of Yamagamis' research, … 相似文献
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Summary: In order to explore the effect of high glucose concentration and high glucose concentration with hypoxia on the production of hypoxia-inducible factor-1α (HIF-1α) and vascular endothelial growth factor (VEGF), human RPE cells were cultured in 5,56 mmol/L glucose (control group), 5.56 mmol/L glucose with 150 !a mol/L COCl2 (hypoxic group), 25 mmol/L glucose (high glucose group) and 25 mmol/L glucose with 150 μmol/L COCl2 (combination group). RT-PCR was used to detect the expression of HIF-1α and VEGF mRNAs. Western blot analysis was used to measure the levels of HIF-1α and VEGF proteins. Although the small amount of HIF-1α protein was able to be detected in high glucose group but not in control group, there was no significant difference between the expression of HIF-1α mRNA of RPE cells in high glucose group and that of RPE cells in control group. As compared with RPE cells in control group, the mRNA expression and the protein synthesis of VEGF in high glucose group were up-regulated. As compared with RPE cells in hypoxic group, the expression of HIF-1α mRNA of RPE cells in combination group was not different, but the protein synthesis of HIF-1α, the mRNA expression and the protein synthesis of VEGF were more obviously up-regulated. In conclusion, high concentration glucose mainly influence the protein synthesis of HIF-1α of RPE cell, and HIF-1α protein is able to be accumulated in high concentration glucose. Under hypoxia, the HIF-1α protein induced by high concentration glucose is more stable, and the expression of VEGF is obviously increased. It is suggested that high concentration glucose may play a role in retinal neovascularization, especially at ischemia stage of diabetic retinopathy. 相似文献
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角膜上皮擦伤致复发性角膜上皮糜烂临床分析 总被引:2,自引:0,他引:2
目的分析角膜上皮擦伤所致继发性复发性角膜上皮糜烂的临床特征,为其诊断和治疗提供一定的帮助。方法回顾性分析9例角膜上皮擦伤所致继发性复发性角膜上皮糜烂患者的临床资料,包括患者病史、一般情况、临床特点、诊断与治疗及预后等。结果 9例患者中男4例,女5例;年龄18~51岁;初次发作距角膜外伤的时间间隔为2~24周,平均(8.8±6.5)周。致伤物分别为手指、眼镜、塑料、纸片等。典型的症状表现为早晨醒时或夜晚睡眠时突然发病,患眼出现疼痛、眼红、流泪、畏光、异物感等刺激症状。5例行保守治疗,4例行手术治疗;角膜上皮完全愈合时间为1~10d。未见严重眼部并发症。结论角膜上皮擦伤致继发性复发性角膜上皮糜烂具有典型的临床特征,表现为早晨睡醒或睡眠时突然发作的眼部刺激征,且有反复发作的特点,部分多次反复发作的患者需要手术治疗。该病的预后良好。 相似文献
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目的:研究角膜移植后角膜新生淋巴管与新生血管间关联。方法:人角膜取自行二次角膜移植的19名患者。5核苷酸酶-碱性磷酸酶(5-nase-Alkaline phosphatase,5-NA-ALP)双重酶组织化学染色及淋巴内皮细胞受体(lymphatic vessel endothelial receptor,LYVE-1)、内皮细胞黏附因子-1(platelet endothelial cell adhesion modecule-1,PECAM-1)双重免疫组化法标记角膜中的新生血管和淋巴管,并进行淋巴管计数(lymphatic vessels counting,LVC)和血管计数(blood vessels counting,BVC),比较BVC与LVC之间的关联。结果:角膜中存在角膜新生血管12例(63%),存在角膜新生淋巴管5例(26%)。角膜新生淋巴管仅出现在血管化角膜中。角膜移植后BVC与LVC间呈显著性正相关(r=0.725;P<0.01)。结论:人角膜移植后角膜新生淋巴管与新生血管之间存在密切关联。 相似文献
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目的动态检测大鼠角膜碱烧伤后的角膜新生淋巴管和血管的变化,并阐明二者之间的关联。方法制备大鼠角膜碱烧伤模型,于碱烧伤后1周、2周行角膜组织电镜检查,检测角膜新生淋巴管与新生血管。5’核苷酸酶-碱性磷酸酶(5’-nase-alkaline phos-phatase,5’-NA-ALP)双重酶组织化学染色及全角膜免疫荧光染色分别检测碱烧伤后6h、1d、3d、1周、2周、3周、4周、5周、6周、7周、8周的角膜新生淋巴管和新生血管的动态变化,并进行淋巴管计数(lymphatic vessels counting,LVC)和血管计数(blood vessels counting,BVC)比较。结果电镜观察结果:角膜碱烧伤后1周,角膜基质层出现新生血管,未见淋巴管;碱烧伤后2周,新生血管和新生淋巴管均出现。酶组织化学染色结果显示:碱烧伤后6h有新生血管,1周时角膜基质层存在新生淋巴管,2周时LVC和BVC均达到高峰,分别为(16.41±1.00)个和(50.40±1.56)个;以后逐渐下降,5周时LVC为(0.33±0.50)个,BVC为(12.52±2.51)个;8周时均为0。碱烧伤后,新生淋巴管和新生血管呈显著性正... 相似文献