Sublethal treatment with plasma-activated medium induces senescence-like growth arrest of A549 cells: involvement of intracellular mobile zinc

Journal of Clinical Biochemistry and Nutrition
Hirokazu HaraTetsuo Adachi

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 (Zn2+) 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 Zn2+ and the Zn2+ chelator TPEN counteracted PAM-induced growth suppression, suggesting that Zn2+ 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 Zn2+-dependent manner. These results suggest that the induction of growth arrest and cellular senescen...Continue Reading

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Citations

Dec 21, 2019·Journal of Biochemical and Molecular Toxicology·Joannie LemaireCatherine Jumarie
Apr 22, 2020·Metallomics : Integrated Biometal Science·Norika GotoTetsuo Adachi
Oct 20, 2019·Archives of Biochemistry and Biophysics·Misaki NagayaTetsuo Adachi

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Methods Mentioned

BETA
fluorescence imaging
electrophoresis
PCR
flow cytometry

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