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In Vivo Assessment of Alveolar Macrophage Efferocytosis Following Ozone Exposure
08:54

In Vivo Assessment of Alveolar Macrophage Efferocytosis Following Ozone Exposure

Published on: October 22, 2019

Cumene hydroperoxide debilitates macrophage physiology by inducing oxidative stress: possible protection by

Gurpreet Kaur1, M Sarwar Alam, Mohammad Athar

  • 1Department of Medical Elementology & Toxicology, Faculty of Science, Jamia Hamdard, Hamdard Nagar, New Delhi 110062, India.

Chemico-Biological Interactions
|January 13, 2009
PubMed

Insights

Cumene hydroperoxide (Cum-OOH) impairs macrophage function and immune response by inducing oxidative stress. Alpha-tocopherol (vitamin E) effectively protects macrophages from Cum-OOH toxicity, preserving their physiological integrity and function.

Area of Science:

  • Immunology
  • Cell Biology
  • Toxicology

Background:

  • Macrophages are crucial phagocytes dependent on membrane integrity for function.
  • Cumene hydroperoxide (Cum-OOH) is a peroxidative agent that can induce oxidative stress.
  • Alpha-tocopherol (vitamin E) is known for its membrane-protective properties against oxidative damage.

Purpose of the Study:

  • To investigate the effects of Cum-OOH on macrophage physiology.
  • To evaluate the protective role of alpha-tocopherol against Cum-OOH-induced impairment.

Main Methods:

  • In vitro exposure of murine peritoneal macrophages to varying concentrations of Cum-OOH.
  • Assessment of redox balance, cytokine release, nitric oxide production, lysosomal enzyme secretion, respiratory burst, phagocytosis, and intracellular killing.
  • Evaluation of mannose receptor recycling and expression.
  • Pretreatment with alpha-tocopherol to assess protective effects.

Main Results:

  • Cum-OOH exposure (10-200 microM) severely impaired macrophage physiology and altered redox balance.
  • Increased release of pro-inflammatory cytokines, nitric oxide, and lysosomal enzymes.
  • Reduced respiratory burst, phagocytosis, intracellular killing, and mannose receptor recycling.
  • Alpha-tocopherol pretreatment (25 microM) preserved macrophage functions near control levels.

Conclusions:

  • Cum-OOH exposure significantly impairs macrophage immune functions through oxidative stress.
  • Alpha-tocopherol supplementation effectively safeguards macrophages against Cum-OOH toxicity.
  • These findings highlight the potential of alpha-tocopherol in mitigating Cum-OOH-induced immune cell damage.

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