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. 1996 Sep;149(3):1009–1015.

Decrease of glomerular disialogangliosides in puromycin nephrosis of the rat.

H Holthöfer 1, J Reivinen 1, M L Solin 1, A Haltia 1, A Miettinen 1
PMCID: PMC1865163  PMID: 8780404

Abstract

Puromycin aminonucleoside nephrosis (PAN) is a model for human minimal change nephropathy induced in rats by injection of puromycin. In PAN, defective sialylation of a major sialoprotein of podocytes, podocalyxin, has been demonstrated and the consequent decrease of anionic charge suggested as a causative factor for increased glomerular permeability and proteinuria. Whether defective sialylation is a general feature of PAN affecting also glomerular glycosphingolipids is not known. We have shown that rat glomeruli are rich in disialogangliosides GD3 and O-acetyl GD3, the functions of which are not known. Here, we made a sequential analysis of the glomerular gangliosides, especially of GD3 and its O-acetyl derivative in acute PAN using immunohistochemical and biochemical techniques and compared the results with another rat model of glomerular disease, Heymann nephritis. The prominent immunohistochemical finding was the almost total disappearance of glomerular O-acetyl GD3 and a substantial decrease of its precursor GD3 peaking at 10 days after injection of puromycin. Segmental areas lacking these gangliosides remained in glomeruli still at 30 days after injection. The response was dose dependent. Semiquantitative analysis by thin layer chromatograms showed that O-acetyl GD3 was decreased by 41% already at 3 days and by 60% at 10 days after injection of puromycin. Also GD3, the immediate precursor of O-acetyl GD3, was decreased by 20 and 19%, respectively, at 3 and 10 days after injection. At 3 days after injection, overt proteinuria had not started. At these times, no other changes were observed in the glomerular gangliosides. The decrease of glomerular GD3 and O-acetyl GD3 indicates a decrease of GD3 synthase activity and perhaps of O-acetyltransferase activity in PAN nephrosis. As these changes preceded the overt proteinuria, they may have a causal relationship to it. In the glomeruli of Heymann nephritic rats, no similar changes were seen, suggesting that the sialylation defect is not due to proteinuria but is a consequence of targeted puromycin action on cells.

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Selected References

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