Nephrin forms a complex with adherens junction proteins and CASK in podocytes and in Madin-Darby canine kidney cells expressing nephrin

The American Journal of Pathology
Sanna LehtonenMarilyn G Farquhar

Abstract

Mutations in the NPHS1 gene encoding nephrin lead to congenital nephrotic syndrome of the Finnish type. Nephrin is a key component of the glomerular slit diaphragms between epithelial foot processes, but its role in the pathogenesis of this disease is poorly understood. To further clarify the molecular mechanisms involved we investigated the interactions between nephrin and other components of the foot processes and filtration slits, especially adherens junction proteins, and searched for novel nephrin interacting proteins. Using co-immunoprecipitation and pull-down assays we show here that nephrin forms a multiprotein complex with cadherins and p120 catenin and with three scaffolding proteins, ZO-1, CD2AP, and CASK, in kidney glomeruli and when expressed in Madin-Darby canine kidney cells. CASK was identified as a novel binding partner of nephrin by mass spectrometry and was localized to podocytes in the glomerulus. CASK is a scaffolding protein that participates in maintenance of polarized epithelial cell architecture by linking membrane proteins and signaling molecules to the actin cytoskeleton. Our results support a model whereby the glomerular slit diaphragms are composed of cell adhesion molecules of the immunoglobulin an...Continue Reading

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