肠黏膜上皮细胞的载体分布及功能

被引:16
作者
周济宏 [1 ]
李幼生 [2 ]
洪志坚 [1 ]
胡心宝 [1 ]
解伟光 [1 ]
黎介寿 [2 ]
机构
[1] 南京军区南京总医院烧伤整形科
[2] 南京军区南京总医院解放军普通外科研究所
关键词
IEC-6; [3H]-谷氨酰胺; 谷氨酰胺载体; ASCT2; SN1; ATA1; LAT1; LAT2;
D O I
暂无
中图分类号
R574 [肠疾病];
学科分类号
100201 [内科学];
摘要
目的:谷氨酰胺是肠道细胞的主要氧化燃料,必须通过载体的转运才能进入细胞内。研究IEC-6细胞膜上分布的谷氨酰胺载体种类及其功能。方法:体外培养肠黏膜上皮细胞株IEC-6,检测细胞膜上不同谷氨酰胺载体(ASCT2、SN1、SN2、ATA1、ATA2、LAT1、LAT2)的mRNA;检测载体ASCT2蛋白;测定不同载体对同位素标记谷氨酰胺的转运特性。结果:在IEC-6细胞膜上载体ASCT2、SN1、ATA1、LAT1、LAT2的mRNA均得以表达。细胞外缓冲液中Na+存在时,[3H]-谷氨酰胺摄取率为(164.07±37.94)fmol/(mg protein.10 min);Na+不存在时,[3H]-谷胺酰胺摄取率为(58.71±10.51)fmol/(mg protein.10 min);饱和剂量甲氨基异丁酸(methylamino-isobutyric acid,MeAIB)阻断A类载体后,[3H]-谷氨酰胺摄取率为(81.02±19.59)fmol/(mg protein.10 min)。结论:在IEC-6细胞膜上可能存在载体ASCT2、SN1、ATA1、LAT1、LAT2;Na+依赖性氨基酸载体起主要作用(约64.22%),其中A类载体占50.62%,非A类载体占13.60%,非Na+依赖载体起次要作用(35.78%)
引用
收藏
页码:677 / 681
页数:5
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