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Author Kwak, Geun-Hee ♦ Kim, Tae-Hyoung ♦ Kim, Hwa-Young
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword APPLIED LIFE SCIENCES ♦ APOPTOSIS ♦ CELL CYCLE ♦ CELL PROLIFERATION ♦ MITOCHONDRIA ♦ NEOPLASMS ♦ OXYGEN
Abstract Methionine sulfoxide reductase B3 (MsrB3) is a protein repair enzyme that specifically catalyzes the reduction of methionine-R-sulfoxide residues and has an antioxidant function. We have previously shown that depletion of MsrB3 suppresses the proliferation of normal mammalian cells by arresting cell cycle. In this study, we report the crucial role of MsrB3 in cancer cell death. Deficiency of MsrB3 induced cancer cell death, while MsrB3 overexpression stimulated cancer cell proliferation. MsrB3 depletion resulted in apoptotic cancer cell death through the activation of the intrinsic mitochondrial pathway. MsrB3 deficiency increased the levels of cellular reactive oxygen species (ROS) and led to redox imbalance, and also increased the Bax to Bcl-2 ratio and cytochrome c release, leading to caspase activation. Treatment of MsrB3-depleted cells with N-acetylcysteine, an ROS scavenger, prevented cell death, suggesting that MsrB3 deficiency-induced cell death is associated with increased ROS production. In addition, MsrB3 depletion activated poly(ADP ribose) polymerase-1 (PARP-1) and led to the translocation of apoptosis-inducing factor (AIF) to the nucleus. Taken together, our results suggest that MsrB3 plays an important role in cancer cell survival through the modulation of the intrinsic apoptosis pathway. - Highlights: • MsrB3 deficiency induces apoptotic cancer cell death. • MsrB3 depletion increases cellular ROS and redox imbalance. • MsrB3 down-regulation activates the intrinsic mitochondrial apoptosis pathway.
ISSN 0006291X
Educational Use Research
Learning Resource Type Article
Publisher Date 2017-01-29
Publisher Place United States
Journal Biochemical and Biophysical Research Communications
Volume Number 483
Issue Number 1


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