The hormesis effect of plasma-elevated intracellular ROS on HaCaT cells. (12th November 2015)

• Record Type: Journal Article
• Authors: Szili, Endre J; Harding, Frances J; Hong, Sung-Ha; Herrmann, Franziska; Voelcker, Nicolas H; Short, Robert D
• Is Part Of: Journal of physics. Volume 48:Number 49(2015)
• Publication Date: 2015-11-12
• Subjects: hormesis -- reactive oxygen species (ROS) -- HaCaT cells; Physics -- Periodicals; 530
• DOI: 10.1088/0022-3727/48/49/495401
• Languages: English
• ISSNs: 0022-3727

Abstract

Abstract: We have examined the link between ionized-gas plasma delivery of reactive oxygen species (ROS) to immortalized keratinocyte (HaCaT) cells and cell fate, defined in terms of cell viability versus death. Phospholipid vesicles were used as cell mimics to measure the possible intracellular ROS concentration, [ROSi ], delivered by various plasma treatments. Cells were exposed to a helium cold atmospheric plasma (CAP) jet for different plasma exposure times (5–60 s) and gas flow rates (50–1000 ml min −1 ). Based upon the [ROSi ] data we argue that plasma-generated ROS in the cell culture medium can readily diffuse into real cells. Plasma exposure that equated to an [ROSi ] in the range of 3.81 × 10 −10 –9.47 × 10 −8 M, measured at 1 h after the plasma exposure, resulted in increased cell viability at 72 h; whereas a higher [ROSi ] at 1 h decreased cell viability after 72 h of culture. This may be because of the manner in which the ROS are delivered by the plasma: HaCaT cells better tolerate a low ROS flux over an extended plasma exposure period of 1 min, compared to a high flux delivered in a few seconds, although the final [ROSi ] may be the same. Our results suggest that plasma stimulation of HaCaT cells follows the principle of hormesis .