The Cold Atmospheric Plasma Inhibits Cancer Proliferation Through Reducing Glutathione Synthesis.

Area of Science:

• Biomedical Engineering
• Oncology
• Biochemistry

Background:

• Cold atmospheric plasma (CAP) offers a safe alternative to radiotherapy for cancer treatment.
• CAP's anticancer effects are linked to increased intracellular reactive oxygen species (ROS).
• Glutathione, a critical antioxidant derived from glutamine, supports cancer cell proliferation.

Purpose of the Study:

• To investigate if CAP-induced ROS elevation stems from reduced glutamine-glutathione conversion.
• To elucidate the mechanisms underlying CAP's effects on glutamine metabolism and cancer cells.

Main Methods:

• Utilized esophageal squamous carcinoma cell models (Ec9706 and Eca109).
• Analyzed CAP's impact on glutamine metabolism enzymes (Glutaminase 1, γ-glutamylcysteine ligase).
• Performed transcriptome analysis to explore molecular pathways and proliferation-related genes.

Main Results:

• CAP treatment downregulated Glutaminase 1 and γ-glutamylcysteine ligase expression.
• This led to decreased intracellular glutathione levels and elevated ROS activity.
• Transcriptome data confirmed CAP's involvement in oxidation-reduction and glutamine metabolism pathways, enhancing apoptosis.

Conclusions:

• This research provides novel mechanistic insights into CAP's anticancer action via glutamine metabolism.
• Findings highlight the role of inhibiting glutamine-glutathione conversion in CAP therapy.
• Results pave the way for developing new CAP-based treatments for intractable cancers.