Sublethal Treatment with Plasma-activated Medium Induces Senescence-like Growth Arrest of A549 Cells: Involvement of Intracellular Mobile Zinc

Overview

Journal J Clin Biochem Nutr

Specialty Biochemistry

Date 2019 Aug 6

PMID 31379409

Citations 4

Authors

Hirokazu Hara

Mari Kobayashi

Moe Shiiba

Tetsuro Kamiya

Tetsuo Adachi

Affiliations

Soon will be listed here.

Abstract

Plasma-activated medium (PAM) is a solution produced by exposing a liquid medium to non-thermal atmospheric pressure plasma (NTAPP). A number of reactive molecules, such as reactive oxygen species and reactive nitrogen species, are contained in PAM. Therefore, exposure to high doses of PAM results in cell death. We previously demonstrated that intracellular zinc (Zn) serves as an important mediator in PAM-induced cell death; however, the effects of sublethal treatment with PAM on cell functions are not fully understood. In the present study, we found that sublethal PAM treatment suppressed cell proliferation and induced senescence-like changes in lung adenocarcinoma A549 cells. Cell cycle analysis revealed that PAM induced cell cycle arrest at the G2/M phase. PAM increased the level of intracellular free Zn and the Zn chelator TPEN counteracted PAM-induced growth suppression, suggesting that Zn functions in PAM-induced growth suppression. In addition, sublethal treatment with PAM induced phosphorylation of ATM kinase, accumulation of p53 protein, and expression of p21 and GADD45A, which are known p53 target genes, in a Zn-dependent manner. These results suggest that the induction of growth arrest and cellular senescence by sublethal PAM treatment is mediated by Zn-dependent activation of the ATM/p53 pathway.

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