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Methemoglobin exposure produces toxicological effects in macrophages due to multiple ROS spike induced apoptosis

Rohitas Deshmukh1, Vishal Trivedi

  • 1Malaria Research Group, Department of Biotechnology, Indian Institute of Technology, Guwahati, Assam 781039, India.

Toxicology in Vitro : an International Journal Published in Association with BIBRA
|October 9, 2012
PubMed

Insights

Methemoglobin (MetHb) causes macrophage cell death and immune depression by inducing apoptosis and oxidative stress. Antioxidants protect macrophages from MetHb toxicity, suggesting a role in hemolytic disorders.

Area of Science:

  • Immunology
  • Cell Biology
  • Toxicology

Background:

  • Macrophages are crucial immune cells for host defense.
  • Methemoglobin (MetHb) presence in bodily fluids correlates with tissue damage.
  • The impact of MetHb on macrophage function and survival is not fully understood.

Purpose of the Study:

  • To investigate the cytotoxic effects of MetHb on macrophages.
  • To elucidate the molecular mechanisms underlying MetHb-induced macrophage damage.
  • To explore the potential of antioxidants in mitigating MetHb toxicity.

Main Methods:

  • Utilized mouse macrophage cell line J774A.1 for experiments.
  • Assessed cell viability using MTT assay.
  • Performed light and scanning electron microscopy for morphological analysis.
  • Confirmed apoptosis via annexin-V/FITC staining and DNA fragmentation assays.
  • Measured reactive oxygen species (ROS) generation over time.
  • Evaluated protective effects of antioxidants (NAC, mannitol, PBN).

Main Results:

  • MetHb exposure dose-dependently reduced macrophage viability.
  • Microscopy revealed significant membrane damage and cytosolic accumulation of particulate matter.
  • Macrophage death was confirmed to be apoptosis-induced.
  • MetHb treatment led to periodic ROS spikes, indicating oxidative stress.
  • Antioxidants effectively protected macrophages against MetHb-induced toxicity, apoptosis, and membrane damage.

Conclusions:

  • Methemoglobin induces macrophage toxicity and apoptosis, contributing to immune depression.
  • Oxidative stress mediated by ROS spikes is a key mechanism in MetHb toxicity.
  • Antioxidant intervention shows promise in protecting macrophages from MetHb-induced damage.
  • MetHb-mediated macrophage toxicity may play a role in tissue damage during hemolytic disorders like malaria.

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