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Comparative Proteomic Analysis of Whole Kidney, Medulla, and Cortical Tubules in Diabetic Pathogenesis of Kidney Injury in Mice
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Comparative Proteomic Analysis of Whole Kidney, Medulla, and Cortical Tubules in Diabetic Pathogenesis of Kidney Injury in Mice

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High glucose and angiotensin II increase beta1 integrin and integrin-linked kinase synthesis in cultured mouse

Sang Youb Han1, Young Sun Kang, Yi Hwa Jee

  • 1Department of Internal Medicine, College of Medicine, Inje University, Seoul, South Korea.

Cell and Tissue Research
|September 29, 2005
PubMed

Insights

High glucose and angiotensin II increase integrin beta1 and integrin-linked kinase (ILK) in mouse podocytes, potentially contributing to diabetic nephropathy. Losartan partially reversed these effects, suggesting a role for the integrin-ILK system in kidney disease.

Area of Science:

  • Nephrology
  • Cell Biology
  • Molecular Medicine

Background:

  • Diabetic nephropathy is a leading cause of kidney failure.
  • Integrin alpha3beta1 alterations are implicated in diabetic nephropathy pathogenesis.
  • Podocyte injury is a key feature of diabetic nephropathy.

Purpose of the Study:

  • To investigate the effects of high glucose and angiotensin II on integrin alpha3beta1 and integrin-linked kinase (ILK) expression in cultured mouse podocytes.
  • To determine if these changes are associated with ILK activity and podocyte morphology.
  • To explore the potential role of the integrin-ILK system in diabetic nephropathy.

Main Methods:

  • Cultured mouse podocytes were exposed to high glucose (30 mmol/l) or angiotensin II (1-100 nM).
  • Integrin beta1 and ILK mRNA and protein expression were quantified.
  • ILK kinase activity and cell adhesion were assessed.
  • Podocyte morphology and beta1 integrin localization were analyzed.

Main Results:

  • High glucose and angiotensin II dose-dependently upregulated integrin beta1 and ILK mRNA and protein.
  • Angiotensin II-induced changes were partially inhibited by losartan.
  • ILK upregulation correlated with beta1 integrin synthesis and increased ILK kinase activity.
  • Podocyte exposure to high glucose/angiotensin II induced cell shrinkage, process elongation, and altered beta1 integrin distribution.

Conclusions:

  • High glucose and angiotensin II modulate the integrin-ILK system in podocytes.
  • This modulation may contribute to podocyte dysfunction and diabetic nephropathy development.
  • The integrin-ILK pathway represents a potential therapeutic target for renal diseases affecting podocytes.

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