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alpha-Dystroglycan (alpha-DG) is a negatively charged glycoprotein that covers the surface of podocytes. A decreased glomerular expression of alpha-DG has been described in minimal change nephropathy (MCN), but not in focal segmental glomerulosclerosis (FSGS). This was suggested as a tool to distinguish these diseases. Sialic acid is a negatively charged carbohydrate extensively present on both alpha-DG and podocalyxin, which is also expressed on podocytes. Intrarenal perfusion with bacterial sialidase leads to foot process effacement and proteinuria. This is the first study on the expression of endogenous glomerular sialidase; furthermore, the expression of dystroglycan was re-evaluated.

Expression of sialidase and dystroglycan in human glomerular diseases