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(American Journal of Pathology. 2001;159:1069-1077.)
© 2001 American Society for Investigative Pathology

Regular Articles

Involvement of Lipid Rafts in Nephrin Phosphorylation and Organization of the Glomerular Slit Diaphragm

Matias Simons*, Karin Schwarz*, Wilhelm Kriz{dagger}, Aaro Miettinen{ddagger}, Jochen Reiser*, Peter Mundel* and Harry Holthöfer{ddagger}

From the Department of Medicine and Department of Anatomy and Structural Biology,*
Albert Einstein College of Medicine, Bronx, New York; the Department of Anatomy and Cell Biology,{dagger}
University of Heidelberg, Heidelberg, Germany; and the Department of Bacteriology and Immunology,{ddagger}
University of Helsinki, Helsinki, Finland

NPHS1 has recently been identified as the gene whose mutations cause congenital nephrotic syndrome of the Finnish type. The respective gene product nephrin is a transmembrane protein expressed in glomerular podocytes and primarily localized to the glomerular slit diaphragm. This interpodocyte junction functions in the glomerular filtration by restricting the passage of plasma proteins into the urinary space in a size-selective manner. The functional role of nephrin in this filtration process is so far not very well understood. In this study, we show that nephrin associates in an oligomerized form with signaling microdomains, also known as lipid rafts, and that these localize to the slit diaphragm. We also show that the nephrin-containing rafts can be immunoisolated with the 27A antibody recognizing a podocyte-specific 9-O-acetylated GD3 ganglioside. In a previous study it has been shown that the in vivo injection of this antibody leads to morphological changes of the filtration slits resembling foot process effacement. Here, we report that, in this model of foot process effacement, nephrin dislocates to the apical pole of the narrowed filtration slits and also that it is tyrosine phosphorylated. We suggest that lipid rafts are important in the spatial organization of the glomerular slit diaphragm under physiological and pathological conditions.




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