Hydrogen peroxide and beyond-the potential of high-voltage plasma-activated liquids against cancerous cells

Daniela Boehm, James Curtin, P. J. Cullen, Paula Bourke*

*Corresponding author for this work

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Background: The use of plasma-activated liquids such as PBS, medium or simply plasma-activated water (PAW) has been receiving increasing attention for applications in cancer treatments. Amongst the reactive species contained in these solutions, hydrogen peroxide appears to play a pivotal role in causing cytotoxic effects. H2O2 concentrations can be correlated with reduced cell viability and growth and used as an indicator of the potential efficacy of a plasma-activated liquid. Objective: To investigate the cytotoxic mediators generated in water specific to high-voltage DBD-ACP. Method: Using a high-voltage dielectric barrier atmospheric cold plasma (DBD-ACP) system, we examined PAW-mediated cytotoxic effects on different mammalian cell lines employing a set-up where short-lived reactive species can be discounted and activated liquids with long-term stability are generated. Results: The PAW potency could be modulated using voltage level, treatment time and post-treatment storage time and target-related characteristics such as surface to volume ratio. All of these parameters effected cell viability in a hydrogen peroxide concentration correlated manner. The susceptibility of two cancer cell lines to PAW was similar to that observed for two non-cancer cell lines and the toxicity of plasma-activated water exceeded that of the corresponding hydrogen peroxide concentrations. Conclusion: In cytotoxic plasma activated water an essential role for H2O2 has been demonstrated multi-fold, yet further contributing factors are apparent and remain to be identified.

Original languageEnglish
Pages (from-to)815-823
Number of pages9
JournalAnti-Cancer Agents in Medicinal Chemistry
Volume18
Issue number6
DOIs
Publication statusPublished - 01 Jan 2018
Externally publishedYes

Keywords

  • Cytotoxicity
  • Hydrogen peroxide
  • Peroxynitrate
  • Peroxynitrite
  • Plasma activated water
  • RNS
  • ROS

ASJC Scopus subject areas

  • Pharmacology
  • Drug Discovery

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