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Cold atmospheric plasma (CAP), an ionized gas operated at near-ambient temperatures, has been introduced as a new therapeutic opportunity for treating cancers. The effectiveness of the therapy has been linked to CAP-generated reactive oxygen and nitrogen species such as hydrogen peroxide and nitrite. In this study, we monitor in real-time cancer cell response to CAP over the course of 48 h. The results demonstrate a correlation between cell viability, exposure time (30, 60, 90, and 180 s), and discharge voltage (3.16 and 3.71 kV), while stressing the likely therapeutic role of plasma-generated reactive species. A 30-60 s increase in CAP exposure time and/or a discharge voltage adjustment from 3.16 to 3.71 kV is consistently accompanied by a significant reduction in cell viability. Comparably, levels of hydrogen peroxide and nitrite vary as a function of voltage with elevated levels detected at the highest tested voltage condition of 3.71 kV. CAP ultimately initiates a reduction in cell viability and triggers apoptosis via damage to the mitochondrial membrane, while also deregulating protein synthesis. The findings presented in this study are discussed in the context of facilitating the development of an adaptive CAP platform which could improve treatment outcomes.

Adaptation of Operational Parameters of Cold Atmospheric Plasma for in Vitro Treatment of Cancer Cells