人外伤性白内障晶状体上皮细胞的组织块培养

目的建立人外伤性白内障晶状体上皮细胞体外培养的简单有效方法，观察晶状体上皮细胞的体外生长规律和特点。方法应用改良组织块贴附培养法对儿童及成人外伤性白内障的晶状体上皮细胞进行体外培养，倒置显微镜下观察其生长规律。结果儿童和成人外伤性白内障晶状体上皮细胞都具有增生能力，晶状体上皮细胞均可传3代，晶状体上皮细胞多次传代后生长缓慢。结论儿童和成人外伤性白内障晶状体上皮细胞体外培养增生能力有限，儿童晶状体上皮细胞增生能力较强。改良组织块贴附培养法简单易行，重复性好，是晶状体上皮细胞体外培养的较好方法。     

白内障术后后囊浑浊发生机制的研究--老年性白内障晶状体上皮细胞的体外培养

目的观察老年性白内障晶状体上皮细胞体外培养的生长特点。为研究老年性白内障及术后后囊浑浊的发生机制及防治奠定基础。方法应用改良组织块培养法对超声乳化术中老年性白内障晶状体前囊上皮细胞进行体外培养，在倒置显微镜下观察其生长和分化的规律。结果前囊接种3—5天，有新生上皮细胞自囊片的边缘长出并向四周延伸，第3-4周部分细胞内出现空泡和颗粒等结构改变，生长近于停止；传代培养细胞不能增生。结论老年性白内障晶状体前囊上皮细胞体外增生能力有限。改良组织块培养法培养晶状体上皮细胞简单有效。     

体外培养的晶状体上皮细胞株的确定及生长、分化规律

目的建立牛、兔、人晶状体上皮细胞的体外培养，进一步认识晶状体上皮细胞生长、分化规律。方法应用组织块培养方法进行３种晶状体上皮细胞的体外培养，经Ｇｉｍｓａ染色，在倒置显微镜下对培养的晶状体上皮细胞的生长、分化规律进行观察。结果培养至６ｗｋ的人胎儿晶状体上皮细胞中有特征性的“晶状体小体”形成；牛、兔晶状体上皮细胞去分化是发生在第３代，而人晶状体上皮细胞在第４代开始出现去分化；它们传代至第８代时生长都趋于停止，出现老化表现；来自人的晶状体上皮细胞生长增殖率与年龄呈负相关关系（ｒ＝－０．９９６）。结论“晶状体小体”的形成可作为确定晶状体上皮细胞株的一项特征性依据，而体外培养的人、牛、兔晶状体上皮细胞具有相同的有限生长潜能，在相同的条件下，牛、兔晶状体上皮细胞的生长增殖速度比人晶状体上皮细胞快，但易于发生去分化；此外，人晶状体上皮细胞的生长增殖率与年龄密切相关，年龄越小，晶状体上皮细胞的生长增殖速度越快。     

鼠晶状体上皮细胞的体外培养

目的:建立鼠晶状体上皮细胞体外培养的模型。方法:应用组织块贴片法和酶逐步消化法对10~14d的SD大鼠晶状体上皮细胞进行体外培养,在相差显微镜下观察其生长规律。结果:组织块贴片法在加入培养基4~5d后见细胞生长,2wk细胞融合。而酶逐步消化法在加入培养基后7d左右见细胞贴壁,2wk左右见细胞融合。结论:鼠晶状体上皮细胞体外培养较困难,本试验采用酶逐步消化方法和组织块贴片法。成功地建立了鼠晶状体上皮细胞体外培养的模型,为研究后发性白内障发病机制提供了基础。     

盖玻片辅助人晶状体上皮细胞原代培养法

目的：建立人晶状体上皮细胞原代培养的简便方法并比较不同来源人品状体上皮细胞的生物学特性。方法：取胎龄20周合法引产胚胎眼晶状体囊膜、中山眼科中心眼库眼晶状体囊膜和白内障患者术中撕取的前囊膜，分别在培养皿中铺平，加10乩10％DMEM培养液润湿后加盖盖玻片防止卷曲并促进粘贴．添加培养液浸没盖玻片，37℃培养。同时取相同来源的囊膜按照组织块法培养。观察细胞增殖情况并比较原代人晶状体上皮细胞与人晶状体上皮细胞系SRA01／0413晶体蛋白的表达差异。结果：在盖玻片辅助下，胚胎眼晶状体囊膜第2天即可见明显的增殖细胞由囊膜缘长出，眼库眼囊膜和白内障患者术中撕取的囊膜在3～4d的潜伏期后亦可见增殖细胞长出；组织块法培养出现部分组织块漂浮，且胚胎眼囊膜潜伏期延长至3-4d，眼库眼囊膜和白内障患者晶状体囊膜潜伏期延长至4-5d。结论：盖玻片辅助的改良组织块培养法能尽快获得体外培养的原代晶状体上皮细胞，且操作简便，值得推广应用于品状体病的研究。     

碱性成纤维细胞生长因子基因在胎儿与白内障患者晶状体上皮细胞内表达的比较

目的:研究碱性成纤维细胞生长因子基因在胎儿和白内障患者晶状体上皮细胞内表达的区别。方法:采用原位杂交方法,用cDNA探针检测胎儿培养及组织切片中的晶状体上皮细胞和白内障患者前囊中的晶状体上皮细胞的bFGF的mRNA,并用图像分析进行相对定量,比较胎儿培养细胞、组织切片细胞及患者囊膜细胞的积分光吸收度值。结果:胎儿的培养及组织切片中晶状体上皮细胞和白内障患者前囊中的晶状体上皮细胞都存在bFGF基因表达。胎儿体外培养晶状体上皮细胞、胎儿组织切片晶状体上皮细胞和白内障患者晶状体上皮细胞积分光吸收度值分别为627.1±268.7,131.5±42.8和79.2±26.3。胎儿体外培养晶状体上皮细胞积分光吸收度值显著高于胎儿组织切片晶状体上皮细胞(P<0.01);白内障患者晶状体上皮细胞积分光吸收度值显著低于胎儿晶状体上皮细胞(P<0.01)。结论:晶状体上皮细胞体外培养可增加bFGF基因表达;胎儿晶状体上皮细胞bFGF基因表达显著高于白内障患者晶状体上皮细胞。     

兔眼晶状体上皮细胞的体外培养

目的 建立兔晶状体上皮细胞体外培养的模型。方法 采用组织块培养法,对兔眼晶状体前囊膜进行培养,并利用形态学检查方法和免疫组化技术鉴定。结果 组织块接种２４ｈ后即可见细胞生长,且保持上皮细胞形态,１ｗｋ左右细胞融合,在体外可传至７代,５代以后细胞呈成纤维细胞状,α－晶状体蛋白间接免疫荧光呈阳性反应。结论 成功地建立晶状体上皮细胞体外培养模型,可用于后发性白内障发病机制的研究。     

小牛晶状体上皮细胞传代培养的细胞学特征

目的通过建立小牛晶状体上皮细胞的传代培养,观察晶状体上皮细胞的离休生长特性。方法组织块接种培养;用计数法及ＭＴＴ法测细胞生长曲线;绘制细胞分裂指数曲线。结果采用组织块培养法晶状体上皮细胞原代及传代培养生长良好;ＭＴＴ及细胞计数法所测细胞生长过程基本一致;细胞分裂指数曲线显示细胞在培养第５天达分裂高峰。结论组织块法是晶状体上皮细胞离体培养的较好方法;晶状体上皮细胞具有较好的离体生长能力;ＭＴＴ比色法是检测晶状体上皮细胞的有效方法。     

MRG15的克隆及其在正常和年龄相关性白内障晶状体上皮细胞中的表达

目的克隆死亡因子相关基因15(MRG15)并研究其在正常晶状体和年龄相关性白内障晶状体上皮细胞中的表达，比较二者的差异。方法用改良的消减杂交法克隆死亡因子相关基因15，地高辛标记MRG15cDNA片断制作探针，用原位杂交法研究其在晶状体前囊膜切片上的表达，并作统计学处理。结果克隆到了死亡因子相关基因15的cDNA片断，长约639bp，死亡因子相关基因15在正常晶状体和年龄相关性白内障晶状体上皮细胞中均有表达；经统计分析，其在年龄相关性白内障晶状体上皮细胞中的表达高于其在正常晶状体上皮细胞中的表达。结论MRG15在正常晶状体和年龄相关性白内障晶状体上皮细胞中均有表达；在年龄相关性白内障晶状体上皮细胞中，其表达较正常晶状体增高，提示其可能在白内障的发生中起重要作用。     

小牛晶状体上皮细胞传代培养的细胞学特性

目的 通过建立小牛晶状体上皮细胞的传代培养，观察晶状体上皮细胞的离体生长特性。方法 组织块接和培养；用计数法及ＭＴＴＩ地测细胞生长曲线；绘制细胞分裂指数曲线。结果 采用组织块培养法晶状体上皮细胞原代及传代培养生长良好；ＭＴＴ及细胞计数法所测细胞生长过程基本一致；细胞分裂指数曲线显示细胞在培养第５天达分裂高峰。结论组织块法是晶状体上皮细胞离体培养的较好方法；晶状体上皮细胞具有较好的离体生长能力；ＭＴ     

Comparison of cell-suspension and explant culture of rabbit limbal epithelial cells

Currently, most investigators directly use limbal explants to culture corneal epithelial cells. However, it has not been identified that limbal stem cells do readily migrate from the limbal explants onto culture plate or amniotic membrane carrier. In this study a cell-suspension culture system for rabbit limbal stem cells was developed and compared with the direct explant method in the aspect of stem cells content in the culture system. Rabbit limbal epithelial cells were dissociated from rabbit eyes by dispase and single cell suspension was made for cell-suspension culture. DeltaNp63 expression of cultured rabbit limbal epithelial cells by cell-suspension technique and explant technique was detected. In cell-suspension culture, isolated cell-suspension was evaluated by flow cytometric analysis for vimentin expression and residual limbal tissue after dispase treatment was examined by scanning electron microscopy. In limbal epithelial cells suspension less than 5% cells were vimentin positive. Examination of residual limbal tissue confirmed that all the limbal epithelial cells had been removed. Histological examination revealed that with cell-suspension culture the cultured epithelial cells could differentiate better than with explant technique. In cells cultured with cell-suspension, there were much more cells expressing DeltaNp63 than in explant cultured cells. In cells cultured with explants, most of DeltaNp63 labelling cells mustered around the explants, and peripheral cells on the slides were DeltaNp63 negative. These results suggested that with pure limbal epithelial cells suspension including basal cells, which could directly enter into culture system, cell-suspension culture technique was significantly superior to explant culture technique in terms of stem cells content.     

In vitro generation of functional lens-like structures with relevance to age-related nuclear cataract

PURPOSE: To investigate the capacity of lens epithelial cells, maintained in a modified explant culture system, to mimic normal patterns of lens cell differentiation and to regenerate lens structure and function. METHODS: Lens epithelial explants were set up in pairs with their apical surfaces facing each other. These explant pairs (EPs) were then cultured in vitreous for up to 43 days to promote their growth and differentiation. Immunohistochemistry and conventional light and electron microscopy were used to assess structural and functional properties of the lens-like structures that developed from EPs. RESULTS: EPs that were asymmetrically exposed to vitreous routinely produced biconvex, lens-like structures composed of ordered epithelial and fiber cells that were transparent and had some focusing and magnifying ability. In addition, characteristic of the lens in vivo, fiberlike cells that were peripherally situated in EPs contained markers of the relatively early stages of fiber differentiation, whereas centrally situated cells contained markers of terminally differentiated fibers. During long-term culture of the EPs, a central opacity appeared that had structural features similar to those reported for the early stages of human, age-related nuclear cataract. CONCLUSIONS: This study shows that, given appropriate culture conditions, lens epithelial cells can regenerate ordered lens-like structures with functional properties. This system represents a valuable new tool for the investigation of factors involved in the generation of normal lens structure and function and lens opacification.     

The Biological Study of the Cultured Human Lens Epithelial Cells in Vitro

The human lens epithelial cells (HLE) cultured in vitro was established in normal and cataractous lenses. The biological feature, histological characteristics and the ultrastructure of the cultured HLE cells were investigated. The results reveal that the proliferative capacity of the culutured HLE cells is reversely proportional to the donour age; the cultured HLE cells has the limited proliferative capacity in vitro. The relieve of the contact inhibition is the effective trigger of the HLE cell proliferation. This research work is possible to make a basis for the further study of the regeneration of the lens and the roles of the lens epithelial cells in the development of the cataract. Eye Science 1994; 10:27-31.     

Enhancement of differentiation of human lens epithelium in tissue culture by changes in cell-substrate adhesion

Differentiation of human lens epithelial (HLE) cells cultured in vitro was drastically accelerated when the cells were cultured on cell-substrate adhesion-free surfaces. Spontaneous differentiation of the lens epithelial cells in monolayer cultures could be recognized with the appearance of lentoid bodies after 40-50 days if maintained without further passage. Although dissociated HLE cells reconstituted into monolayers consistently on the haptotactic substrates (either gold-coated biopore membrane or regular plastic dishes), the cells from the same batches exclusively formed cell aggregates when cultured on either biopore membrane or agarose-coated plastic dishes (nonhaptotactic). The cells on nonadhesion substrate first aggregate, then synchronously develop into lentoids by the 10th day of culture. The differentiation of HLE cells into lentoid structures with lens-fiber characteristics was documented by both ultrastructural and biochemical markers, such as loss of cytoplasmic organelles, formation of gap junctions, and the expression of gamma-crystallin and MP26. The system, in which differentiation of epithelial cells can be induced predictably in a short period of time, provides an excellent model for the study of differentiation and gene expression in human lens cells cultured in vitro.     

人角膜缘干细胞体外培养后生物学特性的变化

目的 探讨人角膜缘干细胞体外培养后细胞形态学，抗原性和增殖能力的变化。方法 消化培养法体外培养人角膜缘干细胞。获得细胞单层并观察细胞形态学变化。利用间接免疫荧光组化检测人角膜缘组织HLA-DR抗原在培养前，后的变化，检测培养后细胞增殖核抗原和角膜上皮64KD角蛋白的表达。结果 原代细胞在培养1周形成单层细胞形态以圆柱状细胞为主，培养前角膜缘上皮下少星HLA-DR抗原分布，培养后单层细胞DR抗原表达阴性；单层细胞中多量，散在分布的增殖细胞核抗原阳性细胞，并且部分细胞表达64KD角蛋白，结论 角膜缘干细胞体外培养后分化为角膜上皮，不表达HLA-DR抗原，介仍保持较强的分裂增殖能力，可能是临床移植治疗干细胞缺乏眼表疾病患者的一种有效手段。