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Cold atmospheric plasma (CAP) selectively triggers tumor cell death by initiating a cascade of reactive oxygen and nitrogen species (RONS). This process targets protective catalase, leading to apoptosis in cancer cells but not healthy ones.

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Area of Science:

  • Biophysics
  • Cell Biology
  • Plasma Medicine

Background:

  • Cold atmospheric plasma (CAP) and plasma-activated media (PAM) show promise for selective anti-tumor effects.
  • The precise mechanisms underlying CAP/PAM-induced tumor cell apoptosis require further elucidation.

Purpose of the Study:

  • To elucidate the sequential, multi-step anti-tumor mechanisms of CAP and PAM in vitro.
  • To identify the key reactive species and cellular targets involved in CAP/PAM-induced apoptosis.

Main Methods:

  • Investigated the role of singlet oxygen (1O2), hydrogen peroxide (H2O2), and peroxynitrite (ONOO─) in the anti-tumor effects.
  • Assessed the impact of CAP/PAM on membrane-associated catalase and intracellular glutathione levels in tumor cells.
  • Examined the induction of apoptosis via the hypochlorous acid (HOCl) signaling pathway and lipid peroxidation.

Main Results:

  • CAP/PAM initially generate 1O2, which inactivates tumor cell membrane-associated catalase.
  • Inactivated catalase allows intracellular H2O2 and extracellular ONOO─ to form secondary 1O2, propagating catalase inactivation.
  • This cascade leads to glutathione depletion, lipid peroxidation, and apoptosis induction via HOCl signaling, selectively in tumor cells.

Conclusions:

  • Tumor cell-generated reactive oxygen and nitrogen species (RONS) are crucial for the anti-tumor effects, mediating catalase inactivation and glutathione depletion.
  • CAP/PAM act as triggers by initially inactivating a small fraction of catalase, initiating a self-amplifying RONS signaling cascade within tumor cells.
  • The observed anti-tumor mechanism is selective, as non-malignant cells do not undergo apoptosis under identical CAP exposure.