Tightjunctions,orzonaoccludens,formacontinuousbarriertofluidsacrosstheepitheliumandendothelium.TheyfunctioninregulationofparacellularpermeABIlityandinthemaintenanceofcellpolarity,blockingthemovementoftransmembraneproteinsbetweentheapicalandthebasolateralcellsurfaces.ZonaoccludensproteinsZO-1,-2,and-3(alsoknownasTJP1,2,and3)areperipheralmembraneadaptorproteinsthatlinkjunctionaltransmembraneproteinssuchasoccludinandclaudintotheactinCytoskeleton.ZO-1and-2arerequiredfortightjunctionformationandfunction.Insubconfluentproliferatingcells,ZO-1andZO-2havebeenshowntocolocalizetothenucleusandplayaroleintranscriptionalregulation,possIBLythroughfacilitatingnuclearimport/exportoftranscriptionalregulators.TheZO-2geneistranscribedfromtwopromoters,generatingtheZO-2AandZO-2Cisoforms.ZO-2Clacksa23aminoacidamino-terminalsequencefoundinotherZO-2isoforms.Whilebothisoformsappeartobewidelyexpressed,abnormalregulationoftheZO-2genemaybecorrelatedwithdevelopmentofductalcancer.
Images: Westernblotanalysisofextractsofvariouscelllines,usingZO1antibody(Top)
Immunohistochemicalstainofparaffin-embeddedhumankidneyusingZO1antibodyatdilutionof1:100(40xlens).(Bottom)
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