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目的:探讨RPE移植后排斥反应发生的免疫指标。方法:以经巩膜移植方法行同种异体家兔间视网膜色素上皮(retinalpigmentepithelium,RPE)细胞移植术,术后定期检测外周血中白细胞介素2(Interleukin-2,IL-2)活性变化及免疫抑制剂的影响。结果:单纯移植组血中IL-2活性术后第1天开始升高,第3天时达到峰值,至7、10天时持续高值、14天时仍明显高于对照组,而加用免疫抑制剂组手术后第1天时与对照组无明显差别,第3天时略有升高,第7天时基本恢复正常。结论:RPE移植后检测外周血中IL-2活性变化,可作为判定及监测排斥反应发生的重要指示。 相似文献
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视网膜色素上皮(RPE)移植是目前世界上视网膜研究的热点之一。实验证明,RPE移植不仅能拯救变性的视网膜光感受器,而且可能有预防视网膜新生血管和进行基因治疗等多方面的作用,该项技术现已初步用于临床。现对RPE移植的供林材料选择、手术技术、手术效果、并发症、可能的作用和临床试验进行综述。 相似文献
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兔视网膜色素上皮细胞移植及长期形态学的研究 总被引:3,自引:0,他引:3
视网膜色素上皮(RPE)功能失调或发生病理改变,可导致许多视网膜疾病,包括年龄相关性黄斑变性,青年性遗传性黄斑变性及视网膜色素变性等,严重危害人类视力。能否通过移植正常、健康的RPE细胞治疗这类视网膜疾病,是当前眼科界关注的重要研究课题。我们采用了改良式玻璃体密闭式移植术,术中增加了玻璃体切割,应用带有色素标记的兔RPE细胞移植于无色素性兔的视网膜下间隙。结果显示,移植长达1年后的RPE细胞不但存活,结构形态正常,并且与邻近的RPE细胞(包括移植的与自体的)建立了闭锁小带。移植的RPE细胞与受体的感光细胞紧密结合,受体眼的神经外节盘正常脱落,被移植的RPE细胞吞噬,且未发生排异反应。上述结果显示,本实验兔RPE细胞移植的成功,为临床治疗某些视网膜疾病开辟了新的治疗途径,提供了可靠的实验室根据和应用前景。 相似文献
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视网膜色素上皮细胞移植是近年治疗视网膜变性疾病的一个引人注目的领域。目前视网膜色素上皮移植技术已逐步应用于临床。现就视网膜色素上皮细胞移植的供体材料选择、受体要求、目的基因导入及其临床应用的最新进展作一综述。[眼科新进展2005;25(5):470—472] 相似文献
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通过内路法将分离后的有色兔RPE细胞移植到无色兔眼的视网膜下腔,共完成10只兔(20只眼)的实验手术,分术后2天(2只眼)、10天(6只眼)、20天(6只眼)、40天(4只眼)及90天(2只眼)5个不同观察组,结果表明移植的RPE细胞2天后未完全贴伏于Bruch膜上,术后10天则紧密贴伏其上并形成单细胞层。术后40天移植的RPE细胞与视网膜神经层形成相嵌结构。术后90天移植细胞内有吞噬消化的外节盘膜,提示移植细胞正在行使其新陈代谢的功能。RPE移植成功,为进一步研究移植RPE细胞的生长、功能及免疫反应,并为临床应用奠定基础。 相似文献
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视网膜色素上皮移植失败原因分析 总被引:1,自引:0,他引:1
视网膜色素上皮(retinalpigmentepithelium,RPE)具有重要的生理作用,与其有关的疾病是致盲的重要眼病之一。视网膜色素上皮移植是近年来颇受关注的研究内容,期望移植健康的细胞替代病变的细胞,为某些眼病的治疗奠定基础。本文总结分析了外路法移植失败的原因。1 材料与方... 相似文献
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视网膜色素上皮肿瘤1例大连市第三人民医院眼科张繁友大连市第三人民医院病理科靳惠敏患者李某,男,57岁,住院号19480。因右眼突然视物不清一天,于1995年3月18日来我院眼科就诊。体格检查未见异常。眼部检查:右眼视力眼前手动,外眼正常,前房正常,虹... 相似文献
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地塞米松对低温冷冻后人视网膜色素上皮细胞游离Ca2+浓度的影响 总被引:2,自引:1,他引:2
目的:观察地塞米松对低温冷冻后视网膜色素上皮(retina pigment epithelium,RPE)细胞内Ca2+浓度的影响。
方法:在一70°C条件下,冷冻RPE细胞30秒,分别加入40、60、100、150、200μg/ml的地塞米松后,应用Fura-2/AM荧光负荷技术,测定RPE细胞Ca2+浓度。
结果:地塞米松在40μg/ml~60μg/ml浓度范围可使冷冻后RPE细胞内Ca2+增高18.6%~29.8%,在150μg/ml~200μg/ml可降低细胞内Ca2+浓度28.4%~35.2%。
结论;地塞米松对冷冻后RPE细胞内Ca2+的影响表现为双重作用,即低浓度的促进作用和高浓度的抑制作用,提示临床用药应在冷冻瞬间冲击治疗。
(中华眼底病杂志,1997,13:86-88) 相似文献
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人视网膜色素上皮细胞的冻存和复苏培养 总被引:34,自引:8,他引:26
目的:建立人视网膜色素上皮(retinal pigment epithelium,RPE)细胞的冻存和复苏方法。方法:根据慢冻速融的细胞冻存原则,将原代或传代1~2次培养的人RPE细胞,加入10%二甲基亚砜作为保护剂,液氮中冻存。复苏时将冻存细胞在60℃、2分钟内融化,用台盼蓝染色测定细胞存活率,用抗人角蛋白抗体免疫细胞化学染色作细胞鉴定,每日计算细胞数以确定细胞生长曲线。
结果:经冻存复苏后的RPE细胞的存活率达90%,生长状态与对照组无差异,抗人角蛋白染色阳性,细胞对数生长期在1~4天,群体细胞倍增期约为1.55天。
结论:人RPE细胞液氮冻存可保持生物活性,复苏后生长良好,保持了细胞特征。这可提供细胞系,方便了体外实验,并可能作为RPE细胞移植治疗一些眼底病的细胞库。
(中华眼底病杂志,1997,13:157-159) 相似文献
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WALLACE S. FOULDS MD ChM FRCS BERTIL E. DAMATO FRCS 《Clinical & experimental ophthalmology》1986,14(4):301-311
Eighty-three patients with retinal pigment epitheliopathy have been identified from the photographic and fluorescein records of the Tennent Institute of Ophthalmology in Glasgow. Many have been brought back for follow-up assessment. Twenty-seven patients had placoid lesions. 22 geographic lesions and 15 a condition which we propose to rename the 'not ocular histoplasmosis' (NOH) syndrome. Patients with placoid lesions could be divided into typical acute multifocal placoid pigment epitheliopathy (AMPPE), where the long-term visual prognosis was poor because of recurrent disease leading to extensive areas of atrophy, and acute diffuse placoid pigment epitheliopathy which seemed to be self-limiting. No consistent evidence of viral or immunological abnormality was found in either group of patients
Geographic lesions appeared to result either from a coalescence of focal lesions or from a slow (serpiginous) spread from a single focus.
Four patients with helicoid atrophy lost central vision from disciform lesions.
Seven patients had pigment epithelial disorder associated with sarcoidosis. The pigment epithelial disease was unresponsive to systemic corticosteroid therapy and tended to be complicated by disciform lesions.
Disciform lesions may occur in any type of pigment epitheliopathy, as may serous retinal detachment or pigment epithelial detachment.
A technique for the biopsy of choroid and retinal pigment epithelium is described. This may lead to a better understanding of these disorders. 相似文献
Geographic lesions appeared to result either from a coalescence of focal lesions or from a slow (serpiginous) spread from a single focus.
Four patients with helicoid atrophy lost central vision from disciform lesions.
Seven patients had pigment epithelial disorder associated with sarcoidosis. The pigment epithelial disease was unresponsive to systemic corticosteroid therapy and tended to be complicated by disciform lesions.
Disciform lesions may occur in any type of pigment epitheliopathy, as may serous retinal detachment or pigment epithelial detachment.
A technique for the biopsy of choroid and retinal pigment epithelium is described. This may lead to a better understanding of these disorders. 相似文献
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实验性视网膜脱离Na十-K+-转运ATP酶活性及RPE超微结构改变 总被引:1,自引:1,他引:1
目的:探讨实验性视网膜脱离(retinal detachment,RD)后视网膜色素上皮(retinal pigment epithelium,RPE)对视网膜下液(subretinal fluid,SRF)的输导功能。
方法:将制作成功的实验性单眼RD 28只家兔随机分为4组,每组7只,每只兔的另眼作为对照。分别取RD部位的RPE-脉络膜组织和对照眼相应部位的组织匀浆,再测定ATP水解产物无机磷含量,以判断ATP酶活性;并作实验和对照眼的两种组织相应部位的RP正电镜观察。
结果:实验眼Na十-K+-转运ATP酶活性为(2.16士1.26)/μmol(mg·h),对照眼为(4.84±1.59)μmol/(mg·h),二者差异显著(t=5.52,P<0.01);酶活性降低程度随病程延长而减轻(p<0.05)。电镜观察实验眼RD后第2至4周有自脉络膜向视网膜方向的吞饮泡,且随病程延长而增多。
结论;RD发生后RPE的外向输导功能增强,随病程进展,此功能减弱而内向输导功能产生。
(中华眼底病杂志,1997,13:83-85) 相似文献
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实验观察分析了采用碘酸钠不同程度地选择性破坏视网膜色素上皮层后视网膜其他层的组织病理学改变.给家兔静脉注射30μg/kg的NaIO3(0.05mol),分别间隔48h和72h再注射1次,第7天取出眼球作组织病理学和扫描电镜观察.结果发现间隔48h组RPE变性较重,发生破裂或崩解,此时,视网膜其他层损伤较重;间隔72h组RPE变性较轻,仅发生皱缩,未见破裂,此时视网膜其他层的改变也较轻.结果表明:RP的损伤直接影响到视网膜其他层,RPE损伤越重,视网膜其他层的损伤程度也较重.
(中华眼底病杂志,1995,11:188-189) 相似文献
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目的 观察少量、多次玻璃体内注射免疫抑制剂他克莫司(FK506)对移植到兔眼视网膜下间隙内的人视网膜色素上皮(retinal pigment epithelium, RPE)细胞存活情况的影响。 方法 采用绿色荧光蛋白(green fluorescent protein, GFP)逆转录病毒感 染人RPE细胞。将50 μl(4×103个/μl)表达GFP的人RPE细胞悬液注射到18只白兔及1 0只灰兔双眼视网膜下间隙,手术后所有兔左眼玻璃体内注射5 μl FK506(5 μg/ μl),每周1次,连续5周,然后间周一次至20周;右眼不注射作为对照。眼球壁铺片倒置荧光 显微镜观察移植细胞的存活状态。 结果 白兔于移植后1、2、3、4 、6、10、11、14、18、20、23、24、25、33、54周,灰兔于移植后4、5、6、7、14、18、20、26周双眼视网膜下均可见表达的GFP细胞,但移植术后1~14周内玻璃体内注射了FK506的左眼视网膜下RPE-GFP细胞形态、细胞膜的完整程度均比未注射的右眼好。18周后,7只白兔和3只灰兔双眼视网膜下移植细胞的状态差异不明显。眼球切片苏木素-伊红(hematoxylin-eosin, HE)染色观察结果显示,移植术后1~6周,6只白兔和3只灰兔右眼脉络膜小血管周围可见灶性或弥散的淋巴细胞,应用了FK506的左眼淋巴细胞的浸润明显减少。 结论 移植术后早期玻璃体内使用小剂量免疫抑制剂可减轻局部炎症反应,有利于维持视网膜下间隙移植的异种细胞的存活。 (中华眼底病杂志,2003,19:333-404) 相似文献
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目的探讨自体虹膜色素上皮(iris pigment epithelium,IPE )细胞移植时虹膜取材的较佳方法。方法在20只黑兔眼上按人眼周边虹膜切除术的步骤,分别在左眼( A法,在12点处切取底边为4~5 mm的三角形虹膜组织1块)、右眼(B法,在11点和1点 两处切取底边为2~2.5 mm的三角形虹膜组织块2块)取材,采用酶显微解剖酶分离法对IPE 细胞进行精细的分离和培养,并用光学显微镜、电子显微镜和免疫组织化学等方法对培养的细胞进行观察和鉴定。结果A法取材的IPE细胞培养成功率为65%,B法取材的成功率为95%,经 3~4代的传代即达到移植所需的细胞数。显微镜及免疫组织化学方法观察结果显示,培养的IPE细胞基本保持了原代细胞的特性,细胞活力为85%~93%。结论B法取材的 IPE细胞培养成功率高于A法,培养的IPE细胞在传代到第3代时即可进行移植。(中华眼底病杂志,2003,19:201-268) 相似文献
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视网膜色素变性视网膜的组织病理和超微结构观察 总被引:4,自引:0,他引:4
目的:探讨视网膜色素变性的病理改变及其发病机制。
方法:对1例常染色体显性遗传性视网膜色素变性患者的视网膜进行组织病理和超微结构观察.结果:视网膜各层组织均有变性改变和结构紊乱,并有区域性差异,后极部变性较周边部为重.视网膜色素上皮细胞病变与感光细胞病变程度密切相关,但后者似较前者为重.感光细胞的超微结构有明显变性改变,尤以外节变性,线粒体变性、胞浆内脂褐索沉着为突出。结论:超微结构变化提示感光细胞能量代谢系统和(或)自噬系统功能障碍。
(中华眼底病杂志,1997,13:24-26) 相似文献
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Abstract
This report discusses the recognition of drusen referred to as "hard" which appear to predispose the eye to the development of geographic atrophy of the retinal pigment epithelium. When numerous, small hard drusen tend to become arranged in clusters. On the temporal side in particular, this grouping may be so close as to resemble larger confluent drusen within which the small drusen can only be distinguished by fluorescein angiography.
The approximate interval before geographic atrophy involves the fovea can be estimated by noting the distribution of drusen and the state of the pigment epithelium between the drusen. A stage of incipient atrophy can be recognised as an area of diffuse hyperfluorescence in which pigment clumping or reticular pigment figures and fading of drusen occur. 相似文献
This report discusses the recognition of drusen referred to as "hard" which appear to predispose the eye to the development of geographic atrophy of the retinal pigment epithelium. When numerous, small hard drusen tend to become arranged in clusters. On the temporal side in particular, this grouping may be so close as to resemble larger confluent drusen within which the small drusen can only be distinguished by fluorescein angiography.
The approximate interval before geographic atrophy involves the fovea can be estimated by noting the distribution of drusen and the state of the pigment epithelium between the drusen. A stage of incipient atrophy can be recognised as an area of diffuse hyperfluorescence in which pigment clumping or reticular pigment figures and fading of drusen occur. 相似文献
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Objective To investigate the feasibility of Y27632 to induce transdifferentiation from human retinal pigment epithelial(hRPE)cells into neuron-like cells in vitro.Methods The third to sixth generation of primary hRPE cells were cultured with 2% fetal bovine serum+Dulbecco's modified eagle medium/F12 culture solution,with(experimental group)or without(control group)10 μmol/L Y27632.At 3,6 hours and 1,3,5,7 days after induction,the morphologic changes of RPE cells were observed by inverted microscope.The expression rate of CK18,Map2,NF200 and Pax6 at 3 days after induction in the experimental and control group were detected by immunofluorescent staining.χ2 test was employed for comparison between the two groups.Results 50.1% cells of the experimental group formed axon-like processes and interconnected each other with typical neuron-like appearance.The expression rates of CK18,Map2,NF200 and Pax6 in the experimental group were 43.88% ,31.90% ,57.45% and 65.79% .while the above indexes in the control group were 93.97% ,4.49% ,22.37% and 8.33% respectively.Compared the expression rate of CK18(χ2=64.763),Map2(χ2=23.634),NF200(χ2=21.261)and Pax6(χ2=25.946)between the two groups,the differences were significant(P<0.01).Conclusion The hRPE cells can be trans-differentiated into neuron-like cells in vitro bv Y27632. 相似文献