Ion transport in ‘tight’ epithelial monolayers of MDCK cells

Ion transport in ‘tight’ epithelial monolayers of MDCK cells
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MDCK 细胞“紧密”上皮单层中的离子传输

DOI:
10.1007/bf01875708
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发表时间:
1981
期刊:
The Journal of Membrane Biology
影响因子:
--
通讯作者:
N. Simmons
N. Simmons
中科院分区:
--
文献类型:
--
作者:
N. Simmons

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在滤器支持物上培养的MDCK细胞单层显示出体内上皮细胞的许多特征。先前报道的跨单层电阻值为100 Ωcm−2(Misfeldt,Hamamoto & Pitelka,1976; Cereijido,Robbins,Dolan,Rotunno & Sabatini,1978),表明上皮细胞渗漏。本文描述了一种MDCK细胞株的特性,它显示出完全不同的电生理特性。结果表明,(i)平均跨膜电阻为4.16 kΩ cm−2,(ii)跨膜离子传输幅度较小,因为平均自发开路PD仅为2.17 mV基底表面正,同位素Na和Cl通量测量未能证明显著的净通量,(iii)哇巴因的作用,阿米洛利和离子取代是一致的transmonolayer净钠运动是主要负责自发性PD,和(iv)在本地化的Na-K ATP酶的不对称性是明显的基础上的3 H-哇巴因结合到细胞单层。
SummaryCultured monolayers of MDCK cells grown upon filter supports display many features ofin vivo epithelia. Previously reported values of transmonolayer resistance of 100 Ωcm−2 (Misfeldt, Hamamoto & Pitelka, 1976; Cereijido, Robbins, Dolan, Rotunno & Sabatini, 1978) indicate a leaky epithelium. This paper describes the properties of a strain of MDCK cells which displays entirely different electrophysiological properties. The results show that (i) the mean transmonolayer resistance is 4.16 kΩ cm−2, (ii) transmonolayer ion transport is of small magnitude since the mean spontaneous open circuit PD is only 2.17 mV basal surface positive and isotopic Na and Cl flux measurements fail to demonstrate a significant net flux, (iii) the action of ouabain, amiloride and ion substitutions are consistent with transmonolayer net Na movement being largely responsible for the spontaneous PD, and (iv) asymmetry in the localization of the Na-K ATPase is evident on the basis of3H-ouabain binding to cell monolayer.
DOI: 10.1016/0005-2736(80)90446-0
发表时间: 1980-01-01
期刊: BIOCHIMICA ET BIOPHYSICA ACTA
影响因子: --
作者:
GECK, P;PIETRZYK, C;HEINZ, E
通讯作者: HEINZ, E
上皮细胞中的钾活性。
DOI: --
发表时间: 1980
期刊: Federation proceedings
影响因子: --
作者:
Civan,MM
通讯作者: Civan,MM