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Areca nut extract suppresses T-cell activation and interferon-gamma production via the induction of oxidative stress

C C Wang1, T Y Liu, S P Wey

  • 1Department of Veterinary Medicine, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 106, Taiwan, ROC.

Food and Chemical Toxicology : an International Journal Published for the British Industrial Biological Research Association
|March 27, 2007
PubMed

Insights

Areca nut extracts (ANE) suppress immune T-cells and reduce vital cytokine production, contributing to oral cancer risk. Antioxidants like N-acetyl-l-cysteine (NAC) can mitigate these harmful effects by reducing oxidative stress.

Area of Science:

  • Oral pathology
  • Immunology
  • Oxidative stress research

Background:

  • Areca quid chewing is a significant risk factor for oral submucous fibrosis (OSF) and oral cancer.
  • Immune dysfunction and oxidative stress are implicated in OSF and oral cancer development.
  • Areca nut extracts (ANE) exhibit cytotoxic and genotoxic effects on oral cells.

Purpose of the Study:

  • To investigate the impact of ANE on T-cell reactivity.
  • To determine the role of reactive oxygen species (ROS) in ANE-induced effects on T-cells.

Main Methods:

  • Splenocytes were treated with ANE.
  • Cytokine production (IL-2, IFN-gamma, IL-4) was measured.
  • Cellular ROS levels and glutathione content were assessed using flow cytometry.
  • The effects of the antioxidant N-acetyl-l-cysteine (NAC) were evaluated.

Main Results:

  • ANE induced significant cytotoxicity and suppressed IL-2 and IFN-gamma production in splenocytes.
  • ANE treatment increased ROS levels in splenic T-cells.
  • The antioxidant NAC attenuated ANE-induced cytotoxicity, suppressed cytokine production, and reduced ROS levels.
  • ANE diminished cellular glutathione levels, an effect reversed by NAC pretreatment.

Conclusions:

  • Areca nut extracts markedly suppress T-cell activation and Th1 cytokine production.
  • Oxidative stress, induced by ANE, plays a key role in mediating these suppressive effects on T-cells.
  • Antioxidant intervention may offer a protective strategy against ANE-induced immunotoxicity.

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