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(American Journal of Pathology. 2002;160:131-139.)
© 2002 American Society for Investigative Pathology

Regular Articles

Podocin Localizes in the Kidney to the Slit Diaphragm Area

Séverine Roselli*, Olivier Gribouval*, Nicolas Boute*, Mireille Sich*, France Benessy*, Tania Attié{dagger}, Marie-Claire Gubler* and Corinne Antignac*

From Inserm U423*
and the Département de Génétique,{dagger}
Université Paris 5, Hôpital Necker–Enfants Malades, Paris, France

We recently cloned a novel gene, NPHS2, involved in autosomal recessive steroid-resistant nephrotic syndrome. This gene encodes a novel podocyte protein, podocin. Given its similarity with the stomatin family proteins, podocin is predicted to be an integral membrane protein with a single membrane domain forming a hairpin-like structure placing both N- and C-termini in the cytosol. Here, we show by in situ hybridization, that during development, the NPHS2 transcript is first expressed in mesonephric podocytes from the S-shaped body and, later, in the metanephric kidney, in the future podocytes at the late S-shaped body stage. In the mature kidney, NPHS2 is exclusively expressed in the podocytes of mature glomeruli. We generated rabbit polyclonal antibodies against fusion proteins derived from the N- and the C-terminal regions of podocin which detected a single band of 49-kd in transfected HEK293 cell lysates by immunoprecipitation and Western blotting. By immunohistology, podocin was detected in podocytes from the early capillary loop stage in the developing nephrons, and at the basal pole, along the GBM, in mature glomeruli. By electron microscopy, we demonstrate that podocin is facing the slit diaphragm with its two ends in the cytoplasm of the foot processes, in agreement with its predicted structure. Our results suggest that podocin could serve to anchor directly or indirectly components of the slit diaphragm to the cytoskeleton.




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