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

Authors
Seon Min JeonSung-Jin LeeTaeg Kyu KwonKyung-Jin KimYoung-Seuk Bae
Department
Dept. of Immunology (면역학)
Issue Date
2010
Citation
FEBS Lett, Vol.584(14) : 3137-3142, 2010
ISSN
0014-5793
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 CKIIa 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 p22phox 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 superoxidedependent activation of p53 acts as a mediator of senescence in HCT116 cells after down-regulation of CKII.
URI
http://kumel.medlib.dsmc.or.kr/handle/2015.oak/35738
Appears in Collections:
1. Journal Papers (연구논문) > 1. School of Medicine (의과대학) > Dept. of Immunology (면역학)
Keimyung Author(s)
권택규
Full Text
https://febs.onlinelibrary.wiley.com/doi/abs/10.1016/j.febslet.2010.05.054
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