Nephrotic syndrome is defined by a proteinuria higher than 50 mg/kgBW/day and hypoalbuminemia <30 g/l. A nephrotic syndrome is always secondary to a glomerular disease.
Different mechanisms have been described in the nephrotic syndrome: circulating nonimmune factors in idiopathic nephrotic syndrome, circulating immune factors in several types of glomerulonephritis, mutations in podocyte, or slit diaphragm proteins in inherited forms of nephrotic syndrome.
Proteinuria in glomerular disease is due to increased filtration of macromolecules (such as albumin) across the glomerular capillary wall. The latter consists of three components: the fenestrated endothelial cell, the glomerular basement membrane (GBM), and the epithelial cell foot processes. The pores between the foot processes are closed by a thin membrane called the slit diaphragm. The filtration of macromolecules across the glomerular capillary wall is normally restricted by charge-selectivity and size-selectivity. The GBM have a...
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Niaudet, P. (2012). Nephrotic Syndrome in Children. In: Elzouki, A.Y., Harfi, H.A., Nazer, H.M., Stapleton, F.B., Oh, W., Whitley, R.J. (eds) Textbook of Clinical Pediatrics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-02202-9_301
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