Abstract
Nephrotic syndrome is caused by increased permeability of the glomerular filtration barrier for macromolecules. The identification of mutations of various podocyte-expressed proteins as causes of familial nephrotic syndrome has significantly contributed to shedding light into the molecular pathogenesis of nephrotic proteinuria and into the physiology of the glomerular sieve. More recent findings have changed our conception of the glomerular filtration barrier from a relatively static structure to a highly dynamic one. Both the multiprotein slit diaphragm complex around nephrin and the integrin receptor complex that mediates binding of the podocyte to the glomerular basement membrane, may translate outside–inside signaling and lead to podocyte actin cytoskeleton rearrangement. This may enable the podocyte network to adapt to environmental changes and respond to injury. Disturbance in these processes may not only be involved in the pathogenesis of hereditary nephrotic syndrome but also in that of more common acquired proteinuric diseases. Elucidation of the molecular mechanisms involved will possibly open the way to new therapeutic approaches.
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Abbreviations
- GBM:
-
glomerular basement membrane
- SD:
-
slit diaphragm
- NS:
-
nephrotic syndrome
- SRNS:
-
steroid-resistant nephrotic syndrome
- FSGS:
-
focal and segmental glomerulosclerosis
- PI3K:
-
phosphoinositide-3 kinase
- IP3:
-
inositol 1,4,5-trisphosphate
- aPKC:
-
atypical protein kinase C
- DAG:
-
diacylglycerol
- NFAT:
-
nuclear factor of activated T cells
- ILK:
-
integrin-linked kinase
- CsA:
-
cyclosporin A
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Acknowledgments
This work has been made possible through an International Society of Nephrology Fellowship awarded to E.M. and was supported by a grant from the Deutsche Forschungsgemeinschaft (SFB 423) to M.Z.
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The authors declare that they have no conflict of interests.
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Zenker, M., Machuca, E. & Antignac, C. Genetics of nephrotic syndrome: new insights into molecules acting at the glomerular filtration barrier. J Mol Med 87, 849–857 (2009). https://doi.org/10.1007/s00109-009-0505-9
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DOI: https://doi.org/10.1007/s00109-009-0505-9