›› 2015, Vol. 36 ›› Issue (1): 48-48.

• 论文 • 上一篇    下一篇

左旋肉碱在人角膜缘上皮细胞的转运特性

李宝全;毕建成;安翠平;李延峰;许顺江   

  1. 河北省石家庄市第一医院检验科,河北 石家庄,050011%河北省中医院检验科,河北 石家庄,050011%河北医科大学第一医院中心实验室,河北 石家庄,050031
  • 发布日期:2015-01-25

GAO Feng;YAO Min;WANG Xiao-mei;LIU Shu-xia;DUAN Hui-jun

LI Bao-quan;BI Jian-cheng;AN Cui-ping;LI Yan-feng;XU Shun-jiang   

  • Published:2015-01-25

摘要: 目的:检测左旋肉碱(L-carnitine,LC)在人角膜缘上皮(human corneal limbal epithelia,HCLE)细胞的转运特性,为进一步阐明 HCLE细胞对 LC的转运机制提供实验依据。方法采用放射摄入实验检测 HCLE细胞对[3 H]-L-carnitine的转运功能,并利用米氏方程(Michaelis-Menten equation)分析计算其动力学参数。结果HCLE细胞对 LC的转运过程具有饱和性和时间依赖性,并且反应体系中需要 Na+的存在。Eadie-Hofstee作图提示 HCLE细胞存在高亲和力和低亲合力2个肉碱转运系统。非标记 LC和乙酰化左旋肉碱可竞争性抑制[3 H]-L-carnitine的转运过程。结论 HCLE细胞可通过主动转运过程将泪液中的左旋肉碱摄入细胞内,发挥其生物学功能。

关键词: 左旋肉碱, 上皮, 角膜, 胞吞转运

Abstract: Objective To investigate the characteristics of L-carnitine (LC)import into human corneal limbal epithelia (HCLE)cells,and to provide an experimental basis for further study of transport mechanism of LC in human ocular epithelium.Methods The transport of [3 H ]-L-carnitine was determined using the radio uptake assay and the apparent kinetic parameters of carnitine uptake by HCLE were estimated by nonlinear regression curve fitting according to the Michaelis-Menten equation.Results The uptake of LC into HCLE cells was saturable and time-dependent,and it also required the presence of Na+ in the external medium.An Eadie-Hofstee plot showed two distinct components:a high-and a low-affinity carnitine transport system in HCLE cells.The unlabelled LC and acetyl-L-carnitine competitively inhibited the uptake of [3 H]-L-carnitine by HCLE cells.Conclusion L-carnitine is transported into HCLE cells from tears by an active carrier mediated transport system and exerts its biological function.

Key words: L-carnitine, epithelium, corneal, transcytosis

中图分类号: