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The Histochemical Journal

, Volume 28, Issue 10, pp 681–687 | Cite as

Sphingolipid activator proteins in a human hereditary renal disease with deposition of disialogangliosides

  • Anni Haltia
  • Marja-Liisa Solin
  • Hannu Jalanko
  • Christer Holmberg
  • Aaro Miettinen
  • Harry Holthöfer
Papers

Summary

Congenital nephrotic syndrome of the Finnish type is a recessively inherited renal disease with glomerular deposits of the disialogangliosideO-acetyl-GD3. Sphingolipid activator proteins (saposins) stimulate the degradation of glycosphingolipids by lysosomal enzymes, and defects in saposins cause accumulation of substrate lipids in the affected tissues in lysosomal storage diseases. Here we report a study of the role of saposins in the accumulation ofO-acetyl-GD3 in kidneys of congenital nephrotic syndrome patients. At the mRNA level, the expression of saposin precursor in diseased kidneys appeared normal, and the nucleotide sequence analysis of cDNA clones did not reveal abnormalities in the prosaposin gene. Immunohistologically, saposins were localized mainly to the epithelial cells of the distal renal tubules or to the parietal epithelial cells of glomeruli. In the nephrotic syndrome kidneys, the staining pattern was highly granular and appeared mostly in the apical part of the epithelial lining, unlike the control kidneys. These results show that a major site of ganglioside metabolism is located in the distal nephron. Furthermore, these results suggest that saposins are not directly involved in the metabolism of the terminal sialic acids of disialogangliosides in the nephrotic syndrome kidneys.

Keywords

Nephrotic Syndrome Sialic Acid Nucleotide Sequence Analysis Lysosomal Storage Disease Distal Nephron 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman & Hall 1996

Authors and Affiliations

  • Anni Haltia
    • 1
  • Marja-Liisa Solin
    • 1
  • Hannu Jalanko
    • 2
  • Christer Holmberg
    • 2
  • Aaro Miettinen
    • 1
  • Harry Holthöfer
    • 1
  1. 1.Department of Bacteriology and ImmunologyUniversity of HelsinkiHelsinkiFinland
  2. 2.Children's HospitalUniversity of HelsinkiHelsinkiFinland

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