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【摘要】 目的 观察体外培养的人类角膜缘干细胞对同种异体外周血淋巴细胞的作用。方法 通过植片技术分离人角膜上皮细胞以及角膜缘干细胞。在两种细胞单层上,观察同种异体外周血淋巴细胞对丝裂原刀豆蛋白A(ConA)的增殖反应。另外,将两种细胞培养上清直接转移到由ConA刺激的淋巴细胞增殖系统,以观察两种细胞释放某些因子的抑制效应。结果 单层角膜缘干细胞对ConA刺激的外周血淋巴细胞增殖反应可以施加有效的抑制效应。角膜缘干细胞培养上清对ConA刺激的外周血淋巴细胞增殖系统,在72h分离上清显示有明显抑制效应。结论 角膜缘干细胞通过细胞交互作用和(或)释放某些抑制性因子对淋巴细胞的活化和增殖发挥潜在的抑制作用。
【关键词】 角膜上皮细胞;角膜缘干细胞;细胞培养 Studies on the keratolimbal stem cell to the pericirculation lymphocyte activation and proliferation
【Abstract】 Objective To investigate the regulation of host lymphocyte activation by the allograft of limbal stem cells.Methods Limbal stem cells and the corneal epithelial cells were cultured and isolated from human corneas by explant technique.The mediums of each cells were gathered time and were freeze at different time in -20℃ after purification.Lymphocytes of the other body were cultured in mediums stimulated by Con A.Limbal stem cells or the corneal epithelial cells of the human were co-cultured with the lymphocytes from the other bodys blood.Lymphocyte proliferation assay was assessed by MTT colorimetric determination.Results Significant proliferation of the lymphocytes was shown after adding the Con A.The gathered supernatant of the 72h either from the limbal stem cells or the corneal epithelial cells was shown a potent inhibitory effect of the lymphocytes proliferation.The monolayer domestic rabbits limbal stem cells,showed a significant suppressive effect on the allograft lymphocytes proliferation after mixe无忧论文 【http://www.uklunwen.com】d lymphocyte culture for 48h,but this phenomenon couldnt be seen in the monolayer corneal epithelium in vitro.Conclusion The results show that there would be a lot of possible mechanisms that worked independently or worked in concert to inhibit the lymphocytes proliferation,but mainly by cell-cell interaction and/or some other soluble factors,and limbal stem cells would take a role on raising the eye immunity.
【Key words】 corneal epithelium; limbal stem cell; cell culture
在比较联合角膜缘的穿透性角膜移植与单纯大植片角膜移植的术后植片存活率的比较时发现,前者的排斥反应发生率低[1,2],其机制尚未见研究报道,是否因为角膜缘干细胞有抑制淋巴细胞生长的功能,亦尚无此方面研究报道,我们前期的实验证实兔角膜缘干细胞可通过细胞交互作用和(或)释放某些抑制性因子抑制同种异体兔淋巴细胞的活化和增殖[3]。本实验旨在观察人类同种异体角膜缘干细胞对宿主淋巴细胞活化和增殖的调节效应,并进一步从实验室体外培养角度证实角膜缘干细胞与角膜上皮细胞相比在引起同种异体排斥反应中的作用。 1 材料与方法 1.1 人角膜缘干细胞的培养及条件培养基的制备 在无菌条件下取新鲜人角膜,将角膜分为中央和角膜缘组织,去除角膜内皮细胞以及后2/3角膜板层后,将组织切成1mm×2mm,上皮细胞面向下置于12孔培养板中,每孔有3块组织。加入少量完全细胞培养基(RPMI-1640培养基,10%胎牛血清,1ml双抗),切勿使组织块漂浮。在37℃体积分数为5%CO2和95%空气条件下进行培养,培养基每1天更换1次,6天去除接种组织块。当细胞形成单层达70%以上时,用0.25%胰蛋白酶和0.04%EDTA液(1∶2)消化传代。在12孔板选择生长良好汇合的传代细胞。在12h内使用无血清RPMI-1640培养基换液3次以去除残留的培养基。然后,每孔加入新鲜无血清培养基2ml,继续培养,每24h收集上清1次,共收集5次。2000r/min离心10min,取上清液,去除细胞碎屑,加入1g/L质量浓度牛血清白蛋白(FBS)。使用3.47μm分子截流量透析袋透析浓缩25倍,-20℃冻存。 1.2 ConA诱导的同种异体人外周血淋巴细胞的增殖 取同种异体人外周血3ml,先用PBS液等量稀释,在缓慢加入3ml的淋巴细胞分离液(上海第一生物制品所研制)。20℃密度梯度离心(2000r/min×20min)后,取出分离好的单核细胞层,用PBS冲洗2次后,加入4ml完全培养基,打匀细胞后,计数。调整细胞浓度至5×109个/L,使用96孔培养板,每孔加细胞100μl,并分别加入各个时间段所取的角膜上皮细胞或角膜缘干细胞的条件培养基50μl,各作6个复孔。设立各组的平行对照组,每孔加入ConA(concanavalin A,C2631,Sigma)至终浓度为2.5mg/L。5ml/L |
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