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Related Experiment Videos

Increased importin alpha protein expression in diabetic nephropathy.

M Köhler1, I B Buchwalow, G Alexander

  • 1HELIOS Clinic, Franz Volhard Clinic at the Max Delbrück Center, Medical Faculty of the Charité, Humboldt University of Berlin, Germany. koehler@fvk-berlin.de

Kidney International
|December 12, 2001
PubMed
Summary

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Diabetic nephropathy increases importin alpha protein expression, particularly importin alpha7, in rat kidneys. This suggests enhanced nuclear transport may contribute to kidney damage in diabetes.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Nephrology

Background:

  • Importins are crucial for nuclear transport of various proteins.
  • Gene expression is altered in diabetic nephropathy.
  • This study investigates importin expression in diabetic kidneys.

Purpose of the Study:

  • To test the hypothesis that importin protein expression is increased in diabetic kidneys.
  • To identify specific importin alpha isoforms affected by diabetes.
  • To explore the role of high glucose and mannose in importin expression.

Main Methods:

  • Kidneys from streptozotocin-induced and spontaneously diabetic rats were analyzed.
  • Immunohistochemistry and Western blotting were employed.
  • Cell culture experiments exposed cells to high glucose and mannose.

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Main Results:

  • Importin alpha isoforms showed differential expression in normal rat kidneys.
  • Diabetic rat kidneys exhibited marked up-regulation of importin alpha isoforms.
  • Importin alpha7 was strongly up-regulated, with other isoforms showing minor increases.
  • High glucose/mannose increased expression of importins alpha3, alpha5/hSRP1, and alpha7 in cultured cells.

Conclusions:

  • Specific importin alpha isoforms, notably importin alpha7, are up-regulated in diabetic rat kidneys.
  • Diabetes stimulates increased importin alpha7 expression.
  • Enhanced nuclear transport in glomerular and tubular cells may occur in diabetes.
  • Increased nuclear transport may contribute to gene expression and nephrosclerosis in diabetes.