title: FXYD5 (dysadherin) regulates the paracellular permeability in cultured kidney collecting duct cells.
abstract: FXYD5 (dysadherin or RIC) is a member of the FXYD family of single-span transmembrane proteins associated with the Na(+)-K(+)-ATPase. Several studies have demonstrated enhanced expression of FXYD5 during metastasis and effects on cell adhesion and motility. The current study examines effects of FXYD5 on the paracellular permeability in the mouse kidney collecting duct cell line M1. Expressing FXYD5 in these cells leads to a large decrease in amiloride-insensitive transepithelial electrical resistance as well as increased permeability to 4-kDa dextran. Impairment of cell-cell contact was also demonstrated by staining cells for the tight and adherence junction markers zonula occludens-1 and β-catenin, respectively. This is further supported by large expansions of the interstitial spaces, visualized in electron microscope images. Expressing FXYD5 in M1 cells resulted in a decrease in N-glycosylation of β1 Na(+)-K(+)-ATPase, while silencing it in H1299 cells had an opposite effect. This may provide a mechanism for the above effects, since normal glycosylation of β1 plays an important role in cell-cell contact formation (Vagin O, Tokhtaeva E, Sachs G. J Biol Chem 281: 39573-39587, 2006).
authors: Dept. of Biological Chemistry, The Weizmann Institute of Science, Israel.
authors: Irina
authors: I
authors: Lubarski
authors: Carol
authors: C
authors: Asher
authors: Haim
authors: H
authors: Garty
mesh_terms: D000584:Amiloride / Q000494:pharmacology; D000818:Animals; D002450:Cell Communication / Q000187:drug effects / Q000502:physiology; D002460:Cell Line; D003911:Dextrans / Q000737:chemistry; D017097:Electric Impedance; D020868:Gene Silencing; D006031:Glycosylation; D007473:Ion Channels; D007685:Kidney Tubules, Collecting / Q000187:drug effects / Q000502:physiology* / Q000648:ultrastructure; D008565:Membrane Proteins / Q000032:analysis / Q000096:biosynthesis / Q000235:genetics / Q000502:physiology*; D051379:Mice; D008840:Microfilament Proteins; D010539:Permeability; D010750:Phosphoproteins / Q000032:analysis; D026941:Sodium Channel Blockers / Q000494:pharmacology; D000254:Sodium-Potassium-Exchanging ATPase / Q000378:metabolism; D062826:Zonula Occludens-1 Protein; D051176:beta Catenin / Q000032:analysis
chemical_list: C503552:Atp1b1 protein, mouse; D003911:Dextrans; C506911:FXYD5 protein, mouse; D007473:Ion Channels; D008565:Membrane Proteins; D008840:Microfilament Proteins; D010750:Phosphoproteins; D026941:Sodium Channel Blockers; C569043:Tjp1 protein, mouse; D062826:Zonula Occludens-1 Protein; D051176:beta Catenin; D000584:Amiloride; D000254:Sodium-Potassium-Exchanging ATPase