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Decrease in ADAR1 expression by exposure to cigarette smoke enhances susceptibility to oxidative stress.

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Cigarette smoking reduces adenosine deaminase acting on RNA 1 (ADAR1) expression, increasing oxidative stress. This study reveals smoking

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Area of Science:

  • Molecular Biology
  • RNA Biology
  • Biochemistry

Background:

  • Adenosine-to-inosine (A-to-I) RNA editing is a crucial post-transcriptional modification in humans, catalyzed by ADAR enzymes.
  • Dysregulation of A-to-I editing is linked to diseases like amyotrophic lateral sclerosis.
  • Extrinsic factors influencing ADAR activity are not well understood.

Purpose of the Study:

  • To investigate the impact of cigarette smoking on ADAR expression.
  • To determine the biological significance of smoking-induced changes in ADAR.
  • To explore the role of ADAR1 in mitigating oxidative stress.

Main Methods:

  • In vitro studies using A549 lung adenocarcinoma cells treated with cigarette smoke extract (CSE).
  • In vivo studies in mice exposed to cigarette smoke.
  • Assessment of ADAR1 protein levels, autophagy markers, oxidative stress markers (protein carbonyl), superoxide dismutase activity, and heme oxygenase-1 expression.

Main Results:

  • CSE treatment significantly decreased ADAR1 protein levels in A549 cells, an effect counteracted by chloroquine, suggesting autophagy activation.
  • Cigarette smoking reduced pulmonary Adar1 protein expression in mice.
  • ADAR1 knockdown in A549 cells increased protein carbonyls and decreased superoxide dismutase activity and heme oxygenase-1 expression.

Conclusions:

  • Cigarette smoking downregulates ADAR1 expression.
  • Reduced ADAR1 contributes to enhanced intracellular oxidative stress induced by cigarette smoking.
  • ADAR1 plays a protective role against oxidative stress.