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Protection of renal tubular cells by antioxidants: current knowledge and new trends

Azar Baradaran1, Hamid Nasri2, Mahmoud Rafieian-Kopaei3

  • 1Department of Pathology, Isfahan University of Medical Sciences, Isfahan, Iran.

Cell Journal
|February 17, 2015
PubMed

Insights

Oxidative stress contributes to acute kidney injury. While antioxidants show promise in lab studies, long-term clinical trials, especially with single antioxidants like vitamin C, yield inconsistent results, prompting further investigation into their efficacy.

Area of Science:

  • Nephrology
  • Toxicology
  • Biochemistry

Background:

  • Acute kidney injury (AKI) often results from toxic or ischemic insults, with oxidative stress implicated as a major factor.
  • Reduced renal tubular cell regeneration during injury is a growing area of research in AKI.
  • Antioxidants are being investigated for their potential in preventing and treating oxidative stress-related conditions, including kidney damage.

Purpose of the Study:

  • To explore the reasons behind the inconsistent outcomes of long-term clinical trials on antioxidant use for preventing and treating kidney injuries.
  • To discuss the potential explanations for the discrepancy between laboratory findings and clinical trial results regarding antioxidant efficacy in AKI.

Main Methods:

  • Literature review and analysis of existing research on oxidative stress in acute kidney injury.
  • Examination of data from laboratory trials and long-term clinical studies involving antioxidants.
  • Discussion of the role of single antioxidant supplementation versus broader antioxidant strategies.

Main Results:

  • Laboratory studies frequently demonstrate the protective effects of antioxidants against kidney injury induced by free radicals.
  • Long-term clinical trials, particularly those examining single antioxidant supplements like vitamin C, have not consistently confirmed these benefits.
  • The efficacy of antioxidants in clinical settings may be influenced by factors not fully replicated in preclinical models.

Conclusions:

  • The effectiveness of antioxidants in treating AKI in humans requires further investigation, considering the complexities of oxidative stress and cellular regeneration.
  • Discrepancies between preclinical and clinical findings highlight the need for more robust, long-term studies and potentially combination therapies.
  • Understanding the limitations of single antioxidant interventions is crucial for developing effective strategies against kidney damage.
Keywords:
Acute Renal InjuryAntioxidantsKidney InjuryOxidative Stress

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