Long-term arsenite exposure induces premature senescence in B cell lymphoma A20 cells

Archives of Toxicology
Kazuyuki Okamura, Keiko Nohara

Abstract

Chronic arsenite exposure induces immunosuppression, but the precise mechanisms remain elusive. Our previous studies demonstrated that arsenite exposure for 24 h induces G0/G1 arrest in mouse B lymphoma A20 cells and the arrest is caused through induction of cyclin-dependent kinase inhibitor p16(INK4a) followed by accumulation of an Rb family protein, p130. In this study, we further investigated the consequences of long-term arsenite exposure of A20 cells. The results demonstrated that exposure to 10 μM sodium arsenite up to 14 days induces a great increase in G0/G1 arrest, irreversible cell growth suppression, cellular morphological changes and positive staining for senescence-associated β-galactosidase. The long-term arsenite exposure also induced up-regulation of p16(INK4a) followed by robust accumulation of p130 and activation of the p53 pathway. Knockdown experiments with siRNA showed that p130 accumulation is essential for cell cycle arrest by long-term arsenite exposure. Since p16(INK4a) and the p53 pathway are known to be activated by DNA damage, we investigated the involvement of DNA damage formation by long-term arsenite exposure. We found that a variety of DNA repair-related genes were significantly down-regulated fr...Continue Reading

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Citations

Mar 28, 2020·Oxidative Medicine and Cellular Longevity·Parameswaran G SreekumarRam Kannan
Dec 15, 2019·Food and Chemical Toxicology : an International Journal Published for the British Industrial Biological Research Association·Kota NakajimaMakoto Shibutani

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