The plasma membrane polarity of human biliary epithelial cells: In situ immunohistochemical analysis and functional implications

被引:44
作者
Scoazec, JY
Bringuier, AF
Medina, JF
MartinezAnso, E
Veissiere, D
Feldmann, G
Housset, C
机构
[1] UNIV PARIS 07,BIOL CELLULAIRE LAB,FAC MED XAVIER BICHAT,F-75870 PARIS 18,FRANCE
[2] UNIV NAVARRA,CLIN UNIV,DEPT MED INTERNA,E-31080 PAMPLONA,SPAIN
[3] UNIV PARIS 06,UNITE HEPATOL,FAC MED ST ANTOINE,PARIS,FRANCE
[4] UNIV PARIS 06,INSERM U402,FAC MED ST ANTOINE,PARIS,FRANCE
关键词
human biliary epithelial cells; immunohistochemistry; membrane transport; plasma membrane; plasma membrane proteins; polarity; simple epithelial cells;
D O I
10.1016/S0168-8278(97)80419-9
中图分类号
R57 [消化系及腹部疾病];
学科分类号
摘要
Background/Aims: In transporting epithelia, like the biliary epithelium, most plasma membrane proteins present a polarized distribution, essential for the maintenance of the structural and functional properties of the epithelium, We therefore analysed the expression of polarized plasma membrane proteins by human biliary epithelial cells in order to compare them with other transporting epithelial cells and to search for differences in plasma membrane protein expression between their different anatomical subsets. Methods: We designed an in situ immunohistochemical study of the various anatomical compartments of the human biliary tract in order to assess the pattern of expression of selected polarized plasma membrane proteins, including integrin receptors, ectopeptidases, membrane transporters and GPI-linked proteins. Results: All biliary epithelial cells expressed the same repertoire of integrins, except for integrin chain alpha 5, restricted to the intra-hepatic compartments, All biliary epithelial cells expressed the following apical ectopeptidases: aminopeptidase-N, neutral-endopeptidase, dipeptidyl-peptidase IV. All biliary epithelial cells expressed the membrane transporter Na+K+-ATPase, restricted to the basolateral domain, and the apical transporters CFTR and MDR-1. The apical AE2 anion exchanger was restricted to the small intra-hepatic bile ducts and the gallbladder, The GPI-linked protein protectin was basolateral in the: intrahepatic bile ducts and apical in the gallbladder. Conclusions: The structural organization of the plasma membrane of biliary epithelial cells is very similar to that of other simple epithelia and exhibits a limited degree of heterogeneity.
引用
收藏
页码:543 / 553
页数:11
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