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Slit diaphragm dysfunction in proteinuric states: identification of novel therapeutic targets for nephrotic syndrome

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Abstract

Several recent studies have demonstrated that the slit diaphragm of the glomerular epithelial cell (podocyte) is the structure likely to be the principal barrier in the glomerular capillary wall. Nephrin identified as a gene product mutated in congenital nephrotic syndrome located at the outer leaflet of plasma membranes of the slit diaphragm. The anti-nephrin antibody is capable of inducing massive proteinuria, which indicates that nephrin is a key functional molecule in the slit diaphragm. Expression of nephrin was reduced in glomeruli of minimal change nephrotic syndrome. Some recent studies demonstrated that podocin, CD2-associated protein and NEPH1 are also functional molecules in the slit diaphragm, and their expressions are altered in membranous nephropathy and also in focal glomerulosclerosis. These observations suggested that the alteration of the molecular arrangement in the slit diaphragm is involved in the development of proteinuria in several kinds of glomerular diseases. Recent studies of our group have demonstrated that type 1 receptor-mediated angiotensin II action reduced the expression of the slit diaphragm-associated molecules and that type 1 receptor blockade ameliorated proteinuria by preventing the function of angiotensin II on the slit diaphragm. By the subtraction hybridization techniques using glomerular cDNA of normal and proteinuric rats, we detected that synaptic vesicle protein 2B and ephrin B1 are involved in the maintenance of the barrier function of the slit diaphragm.

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Author information

Author notes

  1. Fujio Shimizu

    Present address: Niigata Seiryo University, Niigata, Japan

Authors and Affiliations

  1. Department of Cell Biology, Institute of Nephrology, Niigata University Graduate School of Medical and Dental Sciences, 1-757 Asahimachi-dori, Niigata, 951-8510, Japan

    Hiroshi Kawachi, Koichi Suzuki, Naoko Miyauchi, Taeko Hashimoto & Yasuhiro Otaki

Authors
  1. Hiroshi Kawachi
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  2. Koichi Suzuki
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  3. Naoko Miyauchi
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  4. Taeko Hashimoto
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  5. Yasuhiro Otaki
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  6. Fujio Shimizu
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Corresponding author

Correspondence to Hiroshi Kawachi.

Additional information

Presented at the 36th Eastern Regional Meeting of the Japanese Society of Nephrology.

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Kawachi, H., Suzuki, K., Miyauchi, N. et al. Slit diaphragm dysfunction in proteinuric states: identification of novel therapeutic targets for nephrotic syndrome. Clin Exp Nephrol 13, 275–280 (2009). https://doi.org/10.1007/s10157-009-0162-x

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  • DOI: https://doi.org/10.1007/s10157-009-0162-x

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