基质金属蛋白酶在体外视网膜色素上皮细胞损伤模型中的表达

目的:建立体外RPE细胞损伤模型,观察损伤诱导的视网膜色素上皮(retinal pigment epithelium,RPE)细胞移行以及MMP-2和MMP-9的表达。方法:在近铺满期视网膜色素上皮(retinal pigment epitheli-um,RPE)细胞培养板上,采用角膜移植用的环钻和棉签法做圆形细胞刮伤区,SABC免疫组织化学方法检测RPE细胞受创后48hMMP-2和MMP-9的表达;并应用此损伤模型,计数进入缺损区的细胞数,观察地塞米松(Dex)对RPE细胞移行和对MMP-2及MMP-9表达的影响。结果:RPE细胞受创后损伤边缘的RPE细胞逐渐向缺损区移行;免疫组化结果显示,损伤后48h损伤边缘移行的RPE细胞呈MMP-2的阳性表达,MMP-9呈强阳性表达。Dex处理组中损伤诱导的RPE细胞移行明显减少,MMP-2和MMP-9的表达也明显减弱。结论:MMPs在RPE细胞移行修复中有重要意义,Dex可以通过抑制MMP-2和MMP-9的表达而减少RPE细胞移行。     

结缔组织生长因子在增生性玻璃体视网膜病变增生膜中的表达

目的观察结缔组织生长因子(CTGF)在增生性玻璃体视网膜病变(PVR)增生膜中的表达,并鉴别增生膜中阳性细胞来源。方法采用SABC免疫组织化学方法对玻璃体切割手术获得的43例PVR增生膜进行CTGF蛋白的检测,并采用免疫荧光双标记技术在阳性表达的增生膜和正常人眼球标本中判定CTGF阳性细胞来源。结果免疫组织化学显示PVR增生膜中阳性细胞形态多是一类胞体为长圆形或多角形,胞浆丰富的上皮样细胞。17例C2-C3级膜中12例阳性,26例D1-D3级膜中19例阳性,其染色反应为阴性"-"、弱阳性" "、阳性"2 "和强阳性"3 "的分别有5、3、6、3例和7、5、8、6例,总阳性率分别为70.6%和73.1%。统计学分析CTGF阳性表达与膜分级问无相关性(P>0.1)。免疫荧光双标记法显示PVR增生膜中有RPE、巨噬细胞、神经胶质细胞,CTGF阳性细胞来源于RPE细胞;正常眼球RPE层不表达CTGF。结论正常眼球RPE层不表达CTGF,PVR形成过程中RPE细胞在TGF-β1等生长因子的刺激下,CTGF表达上调,表明CTGF参与了PVR增生膜的形成和发展。     

增生性玻璃体视网膜病变增生膜中结缔组织生长因子与转化生长因子β受体和细胞外基质相关性的研究

目的 观察结缔组织生长因子（CTGF）在不同级别增生性玻璃体视网膜病变（PVR）增生膜中的表达及其与转化生长因子β受体（TGF-βR）和细胞外基质（ECM）出现的关系，探讨PVR发病过程中CTGF与TGF-βR和ECM产生的相关性。 方法 采用链霉亲和素生物素复合物（SABC）免疫组织化学方法，检测玻璃体切除手术获得的43例PVR增生膜中CTGF、TGF-βRⅡ、纤维连接蛋白（FN）和Ⅰ型及Ⅲ型胶原蛋白的表达，应用Spearman相关分析判断两样本之间有无相关性。 结果 PVR增生膜中CTGF、TGF-βRⅡ蛋白高表达，阳性表达的细胞主要是上皮样细胞。免疫组织化学显示C级膜中二者阳性表达率分别为70.6%和76.5%，D级膜中分别为73.9%和69.6%。统计学分析结果显示，CTGF、TGF-βRⅡ各级阳性表达率与膜分级间无相关性（P＞0.05）。PVR膜中FN、Ⅰ型和Ⅲ型胶原染色在实质细胞和细胞外间质均有表达;统计学分析结果显示，CTGF与TGF-βRⅡ、FN、Ⅰ型及Ⅲ型胶原的表达呈正相关(P＜0.01)。 结论 PVR增生膜中CTGF、TGF-βRⅡ蛋白表达上调，推测CTGF的产生与TGF-βR的激活有关，CTGF加重增生膜中RPE细胞合成FN和胶原等ECM，参与了PVR增生膜的形成和发展。 (中华眼底病杂志, 2006, 22: 192-195)     

氯化钴对体外培养的视网膜色素上皮细胞VEGF表达的影响

目的探讨人视网膜色素上皮（RPE）细胞体外纯化培养方法和观察氯化钴（CoCl2）对RPE细胞VEGF表达的影响。方法采用酶辅助的显微分离法分离培养人RPE细胞并用细胞角蛋白和S-100免疫组织化学鉴定，用100μmol／L CoCl2 10％胎牛血清的DMEM培养RPE 30h，用免疫印迹方法测量其VEGF蛋白表达水平。结果酶辅助的显微分离法可体外纯化培养RPE细胞，用细胞角蛋白和S-100免疫组织化学染色均呈阳性。100μmol／L CoCl2作用30h后RPE细胞VEGF表达水平可提高2倍。结论通过Hu氏酶辅助的显微分离法，获得了RPE细胞的纯化培养；CoCl2可明显诱导RPE细胞VEGF表达上调。     

结缔组织生长因子在兔视网膜增生膜中的表达

目的观察结缔组织生长因子（CTGF）在实验性增生性玻璃体视网膜病变（PVR）增生膜中的表达,探讨CTGF在PVR视网膜增生膜形成过程中的作用。方法采用Nobuyo的方法从兔视网膜中分离视网膜色素上皮（RPE）细胞并进行体外培养和传代。第3代RPE细胞制备密度为1.1×10^5/mL的细胞悬液。32只日本大耳白兔,取8只作为正常对照组,其余24只采用玻璃体腔内注入RPE细胞悬液的方法建立PVR动物模型。动物分别于造模后7、30、60d处死并摘除眼球,每次处死8只动物。光学显微镜下观察视网膜增生膜的组织学改变,免疫组织化学法检测PVR视网膜增生膜中CTGF的表达。结果造模后5d检眼镜下可见视网膜增生组织开始形成,增生膜随时间的推移逐渐增厚。组织学检查显示,造模后7d兔视网膜表面可见红染的条索状和网状胶原纤维,并可见大量的增生细胞分布其中。光学显微镜下可见视网膜内界膜变厚、粗糙、断裂或结构不清,视网膜各层结构欠清。免疫组织化学法检测表明,正常对照组在玻璃体及视网膜内未见CTGF的特异性染色。造模后7d,CTGF主要表达于视网膜表面增生细胞;造模后30d,CTGF主要表达于增生的细胞及增生的胶原纤维组织中;造模后60d,CTGF主要表达于增生的胶原纤维组织中。结论 CTGF在实验性PVR动物模型中呈高表达,提示CTGF参与了PVR增生膜的形成。     

乙酰肝素酶抑制剂对体外培养视网膜色素上皮细胞增殖的影响

目的：探讨乙酰肝素酶（heparanase-1, HPA-1）抑制剂应用对体外培养的视网膜色素上皮(retinal pigment epithelial, RPE)细胞增殖的影响。方法：采用DMEM培养基(Dulbecco's modified eagles medium, DMEM)体外培养人RPE细胞,选择第5代细胞用于实验。倒置显微镜下直接观察不同质量浓度硫代磷酸甘露醇戊糖（phosphomannopentaose sulfate, PI-88）对人RPE细胞体外生长的干预效果,应用四甲基偶氮唑盐[3-(4,5-dimethylthiazol-2-yl)-2,5-dipheny1 tetrazolium bromide, MTT]比色法检测RPE细胞A₅₇₀值;免疫组织化学方法检测人RPE细胞角蛋白和HPA-1表达。 结果：体外增生的RPE细胞胞浆和细胞核HPA-1呈强阳性表达,以细胞浆内表达为主,PI-88干预后细胞浆表达减弱。PI-88对体外RPE细胞的增生有明显的时效和量效抑制关系,药物干预72h细胞A₅₇₀值随质量浓度不同表现明显下降趋势（P<0.05）;而同一质量浓度,药物质量浓度达到100mg/L及以上时,48~72h才表现A₅₇₀值减小的趋势。结论: HPA-1抑制剂可抑制体外培养RPE细胞的增生,并呈现剂量和时间依赖关系。     

维甲酸对人RPE细胞胞间通讯功能和Cx43表达的影响

目的观察培养的人视网膜色素上皮（RPE）细胞中连接蛋白Cx43的表达特点，以及维甲酸（RA）对人RPE细胞生长和细胞间缝隙连接功能、细胞间通道蛋白Cx43表达的影响及其相互关系。方法免疫组织化学方法观察缝隙连接蛋白（Cx43）在培养的人RPE细胞中的表达特点；不同浓度的RA作用于培养的第4代人的色素上皮细胞，用MTT方法观察RA对体外培养人RPE细胞生长的抑制；用LY染料传输方法测定细胞间隙连接功能，观察这三组不同浓度的RA对人RPE细胞缝隙连接功能的影响；免疫组织化学方法鉴别不同浓度RA影响后的缝隙连接蛋白Cx43的表达，用计算机灰度测量的方法评估表达的强度并作统计学分析。结果免疫组织化学染色显示体外培养的人RPE细胞表达缝隙连接蛋白Cx43，表达的部位主要在细胞浆和细胞膜上；RA对人RPE细胞的生长有明显的抑制作用，其抑制作用呈剂量依赖性；LY染料传输试验表明在RA的作用下RPE细胞间通讯功能明显增强；经计算机图像分析表明RA使连接蛋白Cx43表达增强，增强的程度与RA的浓度呈正相关。结论体外培养的人RPE细胞可以表达Cx43蛋白，RA抑制培养的色素上皮细胞的生长，提高细胞间隙连接通讯功能，上调Cx43蛋白在人RPE细胞中的表达。     

培养人视网膜色素上皮细胞机械损伤后IL-8的表达

目的探讨视网膜色素上皮(retinal pigment epithelium,RPE)细胞受机械损伤后IL-8表达情况。方法取在6孔培养板内培养的RPE细胞,并建立机械损伤模型。待细胞铺满融合后,每孔刮除相同面积的细胞,72h后收集培养上清液,采用ELISA试验检测培养上清液中IL-8的表达,同时用免疫组织化学方法检测RPE细胞内IL-8的表达。结果 RPE细胞在基础状态下,免疫组织化学法检测细胞内IL-8的表达,几乎不着色。经过机械损伤刺激充分反应后,在损伤边缘的RPE细胞内IL-8蛋白质的表达呈阳性,胞浆出现浓淡不一的棕黄色着色。ELISA检测结果显示,体外培养RPE细胞在基础状态下可表达少量的IL-8,在经过机械损伤反应后,IL-8表达量显著增加,3次检测中对照和刮伤模型上清液中IL-8的浓度分别是105×10-12kg.L-1、965×10-12kg.L-1,108×10-12kg.L-1、990×10-12kg.L-1,100×10-12kg.L-1、960×10-12kg.L-1,两者间有显著差异(P<0.01)。结论体外培养RPE细胞经过机械损伤反应后,IL-8的分泌和表达显著增加。提示在视网膜脱离前及脱离过程中,RPE细胞受到通过视网膜神经上皮层传导过来的机械牵拉力的作用后在损伤的修复过程中,可能会诱导IL-8的产生,从而有助于启动RPE细胞的移行及早期的炎症反应,导致PVR的发生。     

应用转基因技术体外培养表达人碱性成纤维细胞生长因子的视网膜色素上皮细胞

目的 探讨应用转基因技术体外培养稳定表达人碱性成纤维细胞生长因子(basic fibroblast growth factor,bFGF)的视网膜色素上皮(retinal pigment epithelium,RPE)细胞的可行性。方法 构建以绿色荧光蛋白(green fluorescent protein,GFP)作为标记基因的人bFGF真核表达载体pcFG。应用脂质体介导法转染人RPE细胞,以G418筛选出表达bFGF的RPE细胞,并进行细胞克隆,传代培养4周。于荧光显微镜下观察GFP的表达情况,用原位杂交和免疫组织化学染色法检测bFGF在RPE细胞的表达情况。结果 酶切结果证实含有GFP的真核表达载体pcFG构建正确。在荧光显微镜下可见RPE细胞表达绿色荧光蛋白。经原位杂交和免疫组织化学染色证实,转染pcFG后的RPE细胞内有大量bFGF—mRNA的转录蛋白表达。结论 应用转基因技术可体外培养稳定表达bFGF的RPE细胞。     

褪黑素对高糖刺激人视网膜色素上皮细胞诱导型一氧化氮合酶表达的影响

目的研究褪黑素对高糖刺激体外培养的人视网膜色素上皮（retinal pigment epithelial,RPE）细胞诱导型一氧化氮合酶（inducible nitric oxide synthase,iNOS）表达的影响。方法培养人RPE细胞,分为对照组、甘露醇组、高糖组和高糖＋褪黑素组,作用48h后,光镜观察细胞形态;MTT法检测细胞活性;免疫荧光染色法和Western blot检测RPE细胞中iNOS的蛋白表达。结果MTT检测结果表明高糖可以抑制RPE细胞增生,加入褪黑素后,抑制作用减弱;免疫荧光染色法和Western blot检测结果表明,与对照组相比,高糖组iNOS蛋白表达明显增高,加入褪黑素后,iNOS表达被显著抑制。结论高糖可以抑制RPE细胞增生,诱导RPE细胞iNOS的表达上调,而褪黑素可减轻细胞损伤。     

Novel growth factors involved in the pathogenesis of proliferative vitreoretinopathy

AIMS: To determine whether hepatocyte growth factor (HGF) and connective tissue growth factor (CTGF) are expressed in human specimens of proliferative vitreoretinopathy (PVR) and to propose a model of PVR pathogenesis based upon the known activities of these growth factors.Methods Immunohistochemical methods (ABC Elite) were used to demonstrate the presence of HGF and CTGF in cryostat sections of five human PVR membranes. RESULTS: In each of the five PVR membranes, stromal cells were immunohistochemically positive for both HGF and CTGF. Based upon this information and the known actions of these growth factors, a model of PVR pathogenesis was developed. In this model, injury of the retina induces an inflammatory response that upregulates HGF expression inducing the formation of multilayered groups of migratory retinal pigment epithelial cells (RPE). These RPE, present in a provisional extracellular matrix, come in contact with vitreous containing TGF-beta. The TGF-beta is activated, upregulating expression of CTGF. Under the influence of TGF-beta and CTGF, RPE become myofibroblastic and fibrosis ensues. Retinal traction induces further detachment continuing the cycle of retinal injury. CONCLUSIONS: HGF and CTGF are expressed in PVR membranes and may play important roles in the pathogenesis of PVR. The expression and function of these growth factors should be critically examined in human PVR specimens, in in vitro cultures of RPE, and in animal models of PVR.     

Migration of retinal pigment epithelial cells in vitro modulated by monocyte chemotactic protein-1: enhancement and inhibition

BACKGROUND: The migration of retinal pigment epithelial (RPE) cells is an initial step in the development of proliferative vitreoretinopathy (PVR). This in vitro study was carried out to investigate the effects of monocyte chemotactic protein-1 (MCP-1) on the migration and proliferation of RPE cells. METHODS: We used an in vitro wound healing model in which a small area of a confluent monolayer of human RPE (HRPE) cells was denuded with a razor blade. The cultures were subsequently incubated with MCP-1, IL-1beta, TNF-alpha, or combinations thereof. Neutralizing IgG1 of antihuman MCP-1, dexamethasone (DEX) or daunorubicin were also added to the cultures to test their inhibitory effects on migration of RPE cells. HRPE migration was measured as the number of cells that entered the denuded area. The effect of MCP-1 on proliferation of HRPE cells was examined by MTT assay. RESULTS: MCP-1 stimulated HRPE cell migration in a dose-dependent manner. IL-1beta or TNF-alpha slightly stimulated HRPE cell migration, but adding anti-MCP- IgG1 significantly reduced this effect. MCP-1-induced migration could be inhibited by DEX but not by daunorubicin. MCP-1 did not show a significant effect on HRPE cell proliferation. CONCLUSION: MCP-1 stimulates HRPE cell migration, suggesting that this chemokine regulates the development of PVR at the initial stage. The migration of HRPE cells induced by IL-1beta and TNF-alpha may be associated with the MCP-1 that HRPE cells secretes under the stimulation of these two cytokines. The knowledge that MCP-1-induced migration of HRPE cells is inhibited by DEX may be useful in devising an effective treatment for PVR.     

Stage specificity of novel growth factor expression during development of proliferative vitreoretinopathy

OBJECTIVE: To compare the relative levels of connective tissue growth factor (CTGF), platelet-derived growth factor alpha (PDGF-AA), and hepatocyte growth factor (HGF) in glial and retinal pigment epithelial (RPE) cells of epiretinal membranes from proliferative vitreoretinopathy (PVR). METHODS: A total of 37 PVR membranes, of various stages, underwent fluorescent immunohistochemisty and confocal laser scanning microscopy to localize CTGF, HGF, and PDGF-AA in RPE and glial cells. RESULTS: Numerous RPE, and relatively fewer glial cells, were found in all stages of PVR. CTGF immunoreactivity increased from early to late stage PVR and was principally expressed by RPE cells in early stage, and by glial cells in late stage PVR. HGF, expressed by both RPE and glial cells, was principally expressed in mid-stage PVR. PDGF-AA, expressed by both cell types, demonstrated a uniform level of staining throughout all stages of PVR. CONCLUSIONS: RPE and glial cells contribute to the expression of CTGF, HGF, and PDGF-AA during PVR, but with specific developmental patterns. PDGF-AA is expressed uniformly throughout all stages of PVR, while HGF expression peaks during mid stage, and CTGF expression is highest during late stage PVR. These results allow for the development of stage-specific therapeutics for PVR that may allow targeting of the early proliferative and/or the late tractional stages of PVR.     

TGF-beta2-induced cell surface tissue transglutaminase increases adhesion and migration of RPE cells on fibronectin through the gelatin-binding domain

PURPOSE: Migration and adhesion of dislocated retinal pigment epithelial (RPE) cells to a fibronectin-rich extracellular matrix is an initial step in proliferative vitreoretinopathy (PVR). In the present study, the functional role of cell surface tissue transglutaminase (tTG) in adhesion and migration of RPE cells on fibronectin (Fn) and collagen type I (Col I) after stimulation with TGF-beta2 was investigated. METHODS: Cultured human RPE cells were treated with 1.0 ng/mL TGF-beta2 for 24 hours. Cell surface tTG expression was determined by cell fraction analysis. Attachment on Col I, full-length Fn, and its 45-kDa gelatin-binding and 110-kDa cell-binding fragment was measured with an MTT assay. Migration of RPE cells was measured by a Boyden chamber assay, and cell spreading was determined. Experiments were performed in the presence or absence of anti-tTG antibodies and anti-integrin alpha5 and beta1 antibodies. RESULTS: TGF-beta2 markedly induced expression of cell-surface tTG on RPE cells and increased attachment and migration on Fn and Col I. Blocking cell surface tTG inhibited attachment, migration, and spreading on Fn and its 45-kDa gelatin-binding fragment, whereas no effect was seen on Col I and the 110-kDa cell-binding Fn fragment. In contrast, blocking of integrin alpha5 and beta1 suppressed adhesion and migration on full-length Fn and the 110-kDa Fn fragment. CONCLUSIONS: These data demonstrate that TGF-beta2 increases expression of cell surface tTG, which in turn strengthens adhesion, migration, and spreading of RPE cells on Fn through the 45-kDa gelatin-binding Fn fragment. At the onset of PVR, this mechanism may help RPE cells to attach and migrate on Fn-containing matrices.     

Inhibition of cell proliferation, migration and apoptosis in blue-light illuminated human retinal pigment epithelium cells by down-regulation of HtrA1

AIM: To investigate the effect of HtrA1 on the proliferation, migration and apoptosis of human retinal pigment epithelium (RPE) cells in the light injured model, as well as the expression of the apoptosis related molecules. METHODS: The human RPE cell line ARPE-19 was exposed to blue light to establish the light injured model. The cells were transfected with HtrA1 siRNA to knockdown HtrA1 expression. Subsequent expression of HtrA1 was determined by real-time polymerase chain reaction (RT-PCR) and Western blot, respectively. Changes in cell proliferation, migration and apoptosis were assessed by cell counting kit-8 (CCK-8), Transwell assay and flow cytometry respectively, as well as changes in the mRNA and protein levels of Bax, Caspase-3 and Bcl-2 expression. RESULTS: HtrA1 was highly expressed in ARPE-19 cells after blue light irradiation. Knockdown of HtrA1 expression inhibited the proliferation, migration and apoptosis of the blue-light-irradiated ARPE-19 cells (P<0.05). Bax and Caspase-3 expression were significantly reduced both at mRNA and protein levels (P<0.05) after siRNA treatment. Bcl-2 expression significantly increased in blue-light-irradiated ARPE-19 cells after siRNA interference (P<0.05). CONCLUSION: Silence of HtrA1 may inhibit the proliferation, migration and apoptosis of ARPE-19 cells in light injured model. Moreover, HtrA1 suppression in blue-light-irradiated ARPE-19 cells may ameliorate cell apoptosis through down-regulation of Bax and Caspase-3, and up-regulation of Bcl-2 expression.     

Induction of interleukin-8 in human retinal pigment epithelial cells after denuding injury

AIM: To determine interleukin 8 (IL-8) and monocyte chemoattractant protein 1 (MCP-1) expression in response to mechanical injury in human retinal pigment epithelial (HRPE) cells. METHODS: Enzyme linked immunosorbent assay (ELISA) was performed to determine IL-8 and MCP-1 secretion by HRPE cells after mechanical denudation. IL-8 and MCP-1 mRNA expression by HRPE cells was assessed using semiquantitative RT-PCR. The effects of immunosuppressive drugs, dexamethasone (DEX) and cyclosporin A (CSA), as well as immunosuppressive cytokines, interleukin 4 (IL-4), interleukin 10 (IL-10), and interleukin 13 (IL-13), on chemokine expression in HRPE cells after denuding injury were analysed. RESULTS: Mechanical injury induced HRPE IL-8 mRNA and IL-8 secretion. Although MCP-1 mRNA was enhanced slightly after denuding injury, MCP-1 secretion was not increased. DEX and CSA inhibited HRPE chemokine expression after injury. IL-4 and IL-13 enhanced IL-8 and MCP-1 production by HRPE cells after injury while IL-10 had no effect. CONCLUSIONS: These results suggest that IL-8 may be involved in retinal inflammatory responses to injury and that DEX and/or CSA treatment may help control the inflammatory components of retinal diseases such as proliferative vitreoretinopathy.     

白细胞介素-6反义寡核苷酸抑制人视网膜色素上皮细胞表达白细胞介素-6

目的　观察人视网膜色素上皮 (retinalpigmentepithelium ,RPE)细胞表达白细胞介素 6(interleukine 6 ,IL 6 )和IL 6反义寡核苷酸 (antisenseoligonucleotide ,ASON)从基因水平阻断RPE细胞表达IL 6的效应 ,为增生性玻璃体视网膜病变的防治寻找新的药物。方法　将培养的人RPE细胞以IL 1β刺激后 ,用酶联免疫吸附试验 (enzymelinkedimmunosorbentassay ,ELISA)、免疫组化染色及原位杂交等方法 ,观察RPE细胞表达IL 6蛋白质和mRNA的情况。结果　在IL 1β介导下 ,RPE细胞对IL 6蛋白质的表达呈时间和剂量反应关系。用IL 1β刺激 8h ,对照组RPE细胞培养上清液中IL 6蛋白质含量为 2 0 0× 10 6g/L ;IL 6ASON (浓度为 2 0 0× 10 5mol/L)组的IL 6蛋白质含量明显降低 ,为 5 5 0×10 7g/L ;两组比较差异有显著意义 (t=4 5 18,P <0 0 1)。免疫组化染色结果显示 ,对照组RPE细胞胞浆中IL 6蛋白质的表达呈深浅不一的棕黄色 ,IL 6ASON组染色则较浅 ;两组比较差异有显著意义(t=2 32 5 ,P <0 0 5 )。原位杂交结果表明 ,对照组RPE细胞胞浆中IL 6mRNA的表达呈紫蓝色 ,而IL 6ASON组染色较淡 ;图像分析结果显示 ,两组灰度值差异有显著意义 (t=3 74 6 ,P <0 0 1)。结论在IL 1β刺激下 ,人RPE细胞可明显表达IL 6蛋白     

促红细胞生成素对人视网膜色素上皮细胞光化学损伤的保护作用

目的 观察重组人促红细胞生成素（EPO）在人视网膜色素上皮(RPE)细胞光化学损伤中的保护作用并探讨其作用机制。 方法 取成人RPE（ARPE）19细胞株传代培养的2～5代细胞建立光损伤模型，光照12 h后再培养24 h终止培养，采用四甲基偶氮唑蓝比色法（MTT）法和流式细胞双染色法检测不同浓度的EPO干预治疗前后RPE细胞活性的变化及细胞凋亡的变化，并添加酪氨酸激酶/信号转导和转录活化因子Jak/STAT的阻断剂（AG490）探讨人重组EPO对人RPE细胞光化学损伤的保护性作用及其保护性机制。 结果 EPO可明显增强 RPE细胞的细胞活性，各组中以40 IU/ml EPO组细胞活性的增强结果最明显；明显减少光化学损伤诱导的人RPE细胞的凋亡，以40 IU/ml EPO组结果最明显。在加入AG490（Jak2激酶抑制剂）组，EPO对细胞活性的增强作用和抑制凋亡作用均被阻止。 结论 EPO对人RPE细胞的光化学损伤有保护治疗作用，其保护作用机制主要通过EPO与其受体结合后保护作用机制起作用。