NADPH oxidase is involved in protein kinase CKII down-regulation-mediated senescence through elevation of the level of reactive oxygen species in human colon cancer cells

FEBS Letters
Seon Min JeonYoung-Seuk Bae

Abstract

We have shown that protein kinase CKII (CKII) inhibition induces senescence through the p53-dependent pathway in HCT116 cells. Here we examined the molecular mechanism through which CKII inhibition activates p53 in HCT116 cells. CKII inhibition by treatment with CKII inhibitor or CKIIalpha small-interfering RNA (siRNA) increased intracellular hydrogen peroxide and superoxide anion levels. These effects were significantly blocked by pretreatment of cells with the antioxidant N-acetylcysteine. Additionally, NADPH oxidase (NOX) inhibitor apocynin and p22(phox) siRNA significantly reduced p53 expression and suppressed the appearance of senescence markers. CKII inhibition did not affect mitochondrial superoxide generation. These data demonstrate that CKII inhibition induces superoxide anion generation via NOX activation, and subsequent superoxide-dependent activation of p53 acts as a mediator of senescence in HCT116 cells after down-regulation of CKII.

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Citations

Sep 7, 2013·Molecules and Cells·Siddhartha Kumar MishraHwan Mook Kim
Dec 19, 2015·Oxidative Medicine and Cellular Longevity·Stéphanie Anaís CastaldoPatrícia Alexandra Madureira
Apr 7, 2018·Experimental & Molecular Medicine·Jeong-Hwan ParkYoung-Seuk Bae
Jan 21, 2015·Archives of Pharmacal Research·Sang Won KangEun Kyung Lee
Jan 7, 2021·International Journal of Molecular Sciences·Junbin Song, Young-Seuk Bae

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