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Contribution of impaired Nrf2-Keap1 pathway to oxidative stress and inflammation in chronic renal failure

Hyun Ju Kim1, Nosratola D Vaziri

  • 1Division of Nephrology and Hypertension, University of California, Irvine, California, USA.

American Journal of Physiology. Renal Physiology
|December 17, 2009
PubMed

Insights

Chronic kidney disease (CKD) worsens oxidative stress and inflammation. In CKD, the protective Nuclear factor erythroid-2-related factor-2 (Nrf2) pathway is impaired, reducing antioxidant defenses.

Area of Science:

  • Nephrology
  • Molecular Biology
  • Biochemistry

Background:

  • Oxidative stress and inflammation are key drivers in chronic kidney disease (CKD) progression.
  • Nuclear factor erythroid-2-related factor-2 (Nrf2) is a crucial regulator of cellular defense against oxidative and electrophilic stress.

Purpose of the Study:

  • To investigate the impact of CKD on Nrf2 activation and its downstream antioxidant gene products in the remnant kidney.
  • To assess the relationship between oxidative stress, inflammation, and Nrf2 pathway function in a rat model of CKD.

Main Methods:

  • A 5/6 nephrectomy rat model was used to induce CKD.
  • Kidney tissues were analyzed for Nrf2 activity, its repressor Keap1, and downstream antioxidant/phase II enzyme products.
  • Markers of oxidative stress (lipid peroxidation, glutathione levels) and inflammation (NF-kappaB, MCP-1, inflammatory enzymes) were quantified.

Main Results:

  • CKD rats showed increased oxidative stress and inflammation, including elevated lipid peroxidation, NF-kappaB activation, and inflammatory mediators.
  • Nrf2 activity (nuclear translocation) was significantly reduced in the remnant kidney at 6 and 12 weeks post-nephrectomy.
  • Expression of Nrf2 target genes (e.g., catalase, SOD, HO-1) was diminished, while the Nrf2 repressor Keap1 was upregulated.

Conclusions:

  • CKD is associated with a marked impairment of Nrf2 activation in the remnant kidney.
  • This Nrf2 dysfunction leads to the downregulation of crucial antioxidant and detoxification enzymes, exacerbating oxidative stress and inflammation in CKD.

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