人晶状体上皮细胞的体外培养

目的建立一种简单可行的人晶状体上皮细胞体外培养的方法.方法利用组织块贴片法,对人晶状体的前囊膜和赤道部囊膜进行培养.对培养的细胞进行形态学观察和鉴定.结果组织块贴壁48～72h后可见人晶状体上皮细胞从组织块边缘长出,具有上皮细胞的形态特点,10～15 d后融合.在体外细胞可传五代,但第三代以后细胞表型向成纤维细胞转化.SABC法染色结果细胞胞浆内α-晶状体蛋白染色阳性.结论成功地建立起人晶状体上皮细胞体外培养模型,可用于后囊膜混浊发病机理和药物试验研究.     

兔晶体上皮细胞培养的技术改进

对兔晶体上皮细胞培养方法作了改进，为控制后发性白内障的预防提供实验手段，取新西兰家兔晶体前囊膜作细胞培养，在原代培养中，以吸管转移囊膜，细胞融合后，用胰酶消化转代，结果：原代培养４８～７２小时后，可见晶体上皮细胞长出，以后细胞呈贴壁单层，铺砌型向外生长，传代后６～８小时细胞贴壁生长。方法经济简便，可为各种实验提供兔晶体上皮细胞。     

人原代晶体上皮细胞bFGF多肽和mRNA的表达

目的 为研究后发性白内障的发生机理,检测生长中人晶体上皮细胞（ＨＬＥＣｓ）自身是否表达碱性成纤维细胞生长因子（ｂＦＧＦ）。方法 体外培养人晶体上皮细胞,用免疫细胞化学和原位核酸分子杂交的方法,检测ＨＬＥＣｓ中ｂＦＧＦ多肽和其ｍＲＮＡ的表达。结果 用免疫细胞化学和原位核酸分子杂交方法,可检测到生长中的人晶体上皮细胞自身表达碱性成纤维细胞生长因子。结论 结合碱性成纤维细胞生长因子促进人晶体上皮细胞生长     

人类晶体上皮细胞培养及其生长抑制的实验研究

对正常人晶体及白内障晶体上皮细胞进行体外培养，并观察体外培养的晶体上皮细胞的生物学特性及组织学变化。最后应用５－氟脲嘧啶、高三尖杉酯碱及骆驼蓬碱对组织培养的晶体上皮细胞进行药物抑制实验。结果显示，人类晶体上皮细胞在体外生存能力有限，体外的生长能力与供体年龄呈负相关。高三尖杉酯碱及骆驼蓬碱可有效地抑制晶体上皮细胞的生长繁殖。根据对培养的晶体上皮细胞生长特性的观察，提出使用边缘光滑的撕囊术可能会降低白内障术后后囊混浊的发生率。     

柔红霉素预防后囊膜混浊的研究

目的研究体外细胞培养中柔红霉素对各类晶体上皮细胞增殖的抑制作用及有效浓度,为后囊膜混浊的药物预防提供新线索。方法传代培养的牛、兔、人晶体上皮细胞经０．５、２．５、５．０、７．５、１０．０μｇ／ｍｌ柔红霉素３７℃孵育１０分钟后,观察细胞生长情况;用药后４８小时,采用Ｇｉｅｍｓａ染色－比色法检测细胞吸光值,并分别求得柔红霉素对三种晶体上皮细胞的半数抑制浓度（ＬＤ５０）。结果柔红霉素对体外培养牛、兔、人晶体上皮细胞的增殖均有显著抑制作用,呈浓度依赖性改变。对于人晶体上皮细胞,０．５μｇ／ｍｌ柔红霉素已有显著抑制效应,７．５μｇ／ｍｌ基本发挥最大作用。牛、兔、人晶体上皮细胞的ＬＤ５０值分别为０．４９、４．３０和４．０６μｇ／ｍｌ。结论柔红霉素低浓度短时间作用能有效抑制体外培养晶体上皮细胞的增殖,通过进一步在体研究,可能成为预防后囊膜混浊的理想药物。     

人晶状体上皮细胞的组织块培养

目的建立人晶状体上皮细胞体外培养的简单有效方法,观察不同年龄人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培养法对胎儿、成人和年龄相关性白内障的晶状体上皮细胞进行体外培养,在倒置显微镜下观察其生长、分化规律。结果胎儿、成人和年龄相关性白内障晶状体上皮细胞都具有增殖能力,胎儿和成人晶状体上皮细胞可传3代,年龄相关性白内障晶状体上皮细胞传代培养基本不能增殖。结论人晶状体上皮细胞体外培养困难,不同年龄人晶状体上皮细胞体外均能增殖,但增殖能力均很有限;改良组织块培养法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。     

脂质体介导外源基因转入人晶体上皮细胞的实验研究

目的确定外源基因能否由脂质体携带进入人原代晶体上皮细胞（ｐｒｉｍａｒｙｈｕｍａｎｌｅｎｓｅｐｉｔｈｅｌｉａｌｃｅｌｓ,ＰＨＬＥＣｓ）。方法体外培养人原代晶体上皮细胞,用阳离子脂质体（ｌｉｐｏｆｅｃｔｉｎｒｅａｇｅｎｔ,ＬＲ）携带重组质粒报道基因（β半乳糖苷酶）,向人原代晶体上皮细胞转移,在转移１２、２４、３６小时,分别表达２天和６天时,用以Ｘｇａｌ为底物的酶显色方法,检测报道基因对人原代晶体上皮细胞的转移率。结果脂质体（ｌｉｐｏｆｅｃｔｉｎ）介导的外源基因可以转入人原代晶体上皮细胞,在转移２４小时,表达２天时转移率可达４８％。结论稳定的外源基因可由脂质体介导转入生长中人原代晶体上皮细胞,作为晶体上皮细胞基因类药物介入的基础研究和应用研究的介导体,脂质体显示出有希望的前景。借此方法也可以从外源基因入手,对晶体上皮细胞的生理和病理活动,进行机制研究。     

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。     

脂质体介导外源基因转入人晶体上细细胞的实验研究

目的 确定外源基因能否由脂质体携带进入人原代晶体上皮细胞（ｐｒｉｍａｒｙ ｈｕｍａｎ ｌｅｎｓ ｅｐｉｔｈｅｌｉａｌ ｃｅｌｌｓ，ＰＨＬＥＣｓ）。方法 体外培养人原代晶体上皮细胞，用阳离子脂质体（ｌｉｐｏｆｅｃｔｉｎ ｒｅａｇｅｎｔ，ＬＲ）携带重且质粒报道基因（β－半乳糖苷酶），向人原代晶体上皮细胞转移，在转移１２、２４、３６小时，分别表达２天和６天时，用以Ｘ－ｇａｌ为底物的酶显色方法，检测报道基     

同一猴、兔眼角膜细胞成分原代培养的实验研究

目的建立从同一角膜片上分离培养角膜上皮、基质和内皮细胞的方法，为研究角膜细胞间的相互作用机制奠定基础。方法采用消化法分离培养猴眼角膜内皮细胞、上皮细胞和兔眼角膜上皮细胞．组织块培养法培养基质成纤维细胞和兔角膜内皮细胞。细胞接种于12孔培养板，并于培养不同时间行Wright染色检查细胞生长情况。结果采用消化法和组织块培养法能成功地培养猴、兔角膜上皮、基质和内皮细胞。猴、兔角膜内皮细胞培养1wk后，均能形成内皮细胞单层，细胞类似天然的六角形态．且以猴内皮细胞明显；猴角膜上皮细胞培养3～4d生长旺盛、但难以形成细胞单层，兔上皮细胞生长旺盛，1wk后已达融合状态，细胞呈膜状伸出板层伪足；猴、兔基质成纤维细胞易培养，1wk后已融合成单层细胞，细胞排列整齐，类似纤维走行样外观。结论从同一角膜材料中能分别培养出角膜3种细胞成份，消化法和组织块培养法相结合既能节省材料，又简单易行。     

大鼠骨髓间充质干细胞体外可诱导分化为角膜上皮细胞

目的:探讨骨髓间充质干细胞 (mesenchymal stem cell,MSC) 分化为角膜上皮细胞的可塑性及其重建角膜上皮的可能性.方法:用密度梯度离心法结合贴壁培养法分离纯化大鼠骨髓MSC,经体外与角膜基质细胞共培养诱导分化,免疫荧光法检测角膜上皮细胞特异标志物K12的表达.结果:体外培养的大鼠骨髓MSC表现出很强的增殖潜能,原代培养的骨髓MSC CD29免疫荧光染色阳性,CD34和CD45为阴性,符合骨髓MSC的特征.MSC与角膜基质细胞共培养1wk后大部分细胞分化为间质细胞,少部分细胞形态上相对偏小,免疫荧光检测这部分细胞表达角膜上皮细胞特异性标志角蛋白K12.结论:体外培养的MSC在角膜基质细胞的诱导下可横向分化为角膜上皮细胞.     

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.     

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。     

Isolation of putative corneal epithelial stem cells from cultured limbal tissue

PURPOSE: To investigate methods of isolating putative corneal epithelial stem cells from cultured limbal tissue. METHODS: Three extraction techniques were compared to identify an efficient method of obtaining a large number of viable corneal epithelial stem cells from the limbus. Limbal tissues were extracted by incubation at 37 degrees C or 4 degrees C for 1 or 16 hours, respectively, with 1.2 U/ml dispase/trypsin or by treatment with 0.05% trypsin and 0.01% ethyldiaminetetraacetic acid (EDTA) at 37 degrees C in single procedure. Collected cells were cultured on NIH/3T3-seeded plates, and colony forming efficiency (CFE) was evaluated. Fluorescence activated cell sorting (FACS) was performed with a Coulter EPICS 753 after incubation with Hoechst 33342 and propidium iodide (PI). Hoechst negative cells were obtained using gates exhibiting low Hoechst blue with a 424/44 nm BP filter. Gated cells of each fraction were re-cultured to assess the capability of colony formation. RESULTS: The mean numbers of viable cells obtained from treatment with dispase and trypsin was 3 x 10(4) cell/ml and 8.06 x 10(5) cell/ml at 37 degrees C and 4 degrees C incubations; the number increased to 1.21 x 10(6) cell/ml with a trypsin/EDTA treatment (p < 0.05). CFE was 9.67 +/- 2.13% and 6.63 +/- 2.35% in rabbit and human cells, respectively. Likewise, the Hoechst negative fraction was 3.61 +/- 0.42% and 5.21 +/- 4.91% in rabbit and human cells, respectively. The sorted Hoechst negative cells were cultured through four passages, forming small round colonies. In rabbit cells, the CFEs of Hoechst negative and positive fractions after FACS, were 12.67 +/- 2.24% and 1.17 +/- 6.13%, respectively (p < 0.05). CONCLUSIONS: Putative corneal epithelial stem cells were efficiently isolated from limbal tissue using a trypsin/EDTA extraction and FACS. This technique may be very useful in tissue engineered stem cell therapy.     

Sodium hyaluronate (hyaluronic acid) promotes migration of human corneal epithelial cells in vitro

PURPOSE: Sodium hyaluronate (hyaluronic acid) is known to promote corneal epithelial wound healing in vivo and in vitro, in animal experiments. Sodium hyaluronate is the ligand for CD44, a cell surface adhesion molecule which has been found on normal human corneal epithelial cells. The purpose of this study was to investigate the effect of sodium hyaluronate on human corneal epithelial cell migration, proliferation, and CD44 receptor expression. METHODS: Human corneal epithelial cell cultures were established from 32 donor corneoscleral rims and maintained separately in three different culture conditions: (1) culture medium only, (2) sodium hyaluronate enriched (0.6 mg/ml) medium, and (3) hydroxypropylmethylcellulose enriched (2.5 mg/ml) medium. The total area of migrating epithelial cell sheets in each case was measured by planimetry on days 4, 8, 12, and 16. Cytospin preparations of cells cultured in the different culture conditions were examined immunohistochemically for proliferation and CD44 receptor expression using antibodies directed against Ki67 and CD44 respectively. RESULTS: Cells cultured in the presence of sodium hyaluronate showed significantly increased migration at days 12 and 16 (Friedmen test: p = 0.0012, day 16; p = <0.001, day 12) compared with cells cultured in the other media. There was no difference in cell proliferation (Ki67) or CD44 expression on cells cultured in the different culture conditions. CONCLUSIONS: Sodium hyaluronate promotes migration but not proliferation or CD44 expression on human corneal epithelial cells in vitro. The beneficial effect of sodium hyaluronate in corneal wound healing is likely to be related to rapid migration of cells leading to rapid wound closure. This may be facilitated by the adhesion between CD44 on the cells and hyaluronic acid, which coats the surface of the denuded cornea.     

羊膜培养液体外抑制兔角膜上皮细胞血管内皮生长因子的表达

目的:探讨羊膜培养液对角膜上皮细胞中血管内皮细胞生长因子(vascula rendothelial growth factor,VEGF)表达的影响。方法:刮除并收集新鲜兔角膜上皮细胞,传代培养接种于35mm培养皿及自制的羊膜培养皿上。实验分为4组,Ⅰ组(对照组):无血清的DMEM培养液,Ⅱ组:去上皮的羊膜培养液,Ⅲ组:未去上皮的羊膜培养液,Ⅳ组:将细胞直接接种于无上皮羊膜。作用48h后用Trizol法提取各组样本的总RNA,进行RT-PCR一步法反应检测各组VEGF mRNA表达并与β-actin比较。结果:正常角膜上皮细胞中有VEGF基因表达,在Ⅲ,Ⅳ组中表达受到明显抑制(P<0.01,n=5)。结论:羊膜培养液明显抑制VEGF mRNA在角膜上皮细胞中的表达。     

牛视网膜毛细血管周细胞的选择性培养

目的:探讨牛视网膜毛细血管周细胞(pericyte,PC)的体外选择性培养方法.方法:结合视网膜微血管的消化分离,采用含200mL/L胎牛血清的DMEM培养基选择性培养Pc,以免疫组织化学染色进行细胞鉴定.通过相差倒置显微镜观察原代PC的形态、生长特性以及与血管碎片之间的关系.结果:通过选择性培养获得的PC的纯度达到98%以上,并能连续传代.PC早期多散布在距血管碎片稍远处,形状不规则.结论:选择性培养的应用可获得较高纯度的PC,简单且具有良好的重复性,无需额外步骤来除杂.