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Title: Inactivation of the FoxO3a transcription factor is associated with the production of reactive oxygen species during protein kinase CK2 downregulation-mediated senescence in human colon cancer and breast cancer cells

Abstract

We previously showed that protein kinase CK2 downregulation mediates senescence through the reactive oxygen species (ROS)–p53–p21{sup Cip1/WAF1} pathway in various human cells. In the present study, we investigated whether the FoxO3a transcription factor is associated with ROS production during CK2 downregulation-induced senescence in human colon cancer HCT116 and breast cancer MCF-7 cells. FoxO3a overexpression suppressed ROS production and p53 stabilization induced by a CK2α knockdown. CK2α downregulation induced nuclear export of FoxO3a through stimulation of AKT-mediated phosphorylation of FoxO3a and decreased transcription of its target genes (Cu/ZnSOD, MnSOD, and catalase). In contrast, CK2α overexpression inhibited AKT-mediated FoxO3a phosphorylation. This resulted in nuclear accumulation of FoxO3a, and elevated expression of its target genes. Therefore, these data indicate for the first time that CK2 downregulation stimulates ROS generation by inhibiting FoxO3a during premature senescence in human colon and breast cancer cells. - Highlights: • FoxO3a overexpression inhibited ROS production mediated by CK2α knockdown. • CK2α downregulation induced nuclear export of FoxO3a via AKT activation. • CK2α downregulation reduced transcription of FoxO3a target genes including SOD. • CK2α upregulation elevated nuclear import and target gene expression of FoxO3a. • This study indicates that CK2 can modulate the intracellular ROS level via FoxO3a.

Authors:
;
Publication Date:
OSTI Identifier:
22606203
Resource Type:
Journal Article
Resource Relation:
Journal Name: Biochemical and Biophysical Research Communications; Journal Volume: 478; Journal Issue: 1; Other Information: Copyright (c) 2016 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
60 APPLIED LIFE SCIENCES; ANIMAL CELLS; ANTIOXIDANTS; CATALASE; CATTLE; GENES; LARGE INTESTINE; MAMMARY GLANDS; MONOCLINIC LATTICES; NEOPLASMS; PHOSPHATES; PHOSPHORYLATION; POLYMERASE CHAIN REACTION; RNA; SUPEROXIDE DISMUTASE; TRANSCRIPTION; TRANSCRIPTION FACTORS

Citation Formats

Park, Seong-Yeol, and Bae, Young-Seuk, E-mail: ysbae@knu.ac.kr. Inactivation of the FoxO3a transcription factor is associated with the production of reactive oxygen species during protein kinase CK2 downregulation-mediated senescence in human colon cancer and breast cancer cells. United States: N. p., 2016. Web. doi:10.1016/J.BBRC.2016.07.106.
Park, Seong-Yeol, & Bae, Young-Seuk, E-mail: ysbae@knu.ac.kr. Inactivation of the FoxO3a transcription factor is associated with the production of reactive oxygen species during protein kinase CK2 downregulation-mediated senescence in human colon cancer and breast cancer cells. United States. doi:10.1016/J.BBRC.2016.07.106.
Park, Seong-Yeol, and Bae, Young-Seuk, E-mail: ysbae@knu.ac.kr. Fri . "Inactivation of the FoxO3a transcription factor is associated with the production of reactive oxygen species during protein kinase CK2 downregulation-mediated senescence in human colon cancer and breast cancer cells". United States. doi:10.1016/J.BBRC.2016.07.106.
@article{osti_22606203,
title = {Inactivation of the FoxO3a transcription factor is associated with the production of reactive oxygen species during protein kinase CK2 downregulation-mediated senescence in human colon cancer and breast cancer cells},
author = {Park, Seong-Yeol and Bae, Young-Seuk, E-mail: ysbae@knu.ac.kr},
abstractNote = {We previously showed that protein kinase CK2 downregulation mediates senescence through the reactive oxygen species (ROS)–p53–p21{sup Cip1/WAF1} pathway in various human cells. In the present study, we investigated whether the FoxO3a transcription factor is associated with ROS production during CK2 downregulation-induced senescence in human colon cancer HCT116 and breast cancer MCF-7 cells. FoxO3a overexpression suppressed ROS production and p53 stabilization induced by a CK2α knockdown. CK2α downregulation induced nuclear export of FoxO3a through stimulation of AKT-mediated phosphorylation of FoxO3a and decreased transcription of its target genes (Cu/ZnSOD, MnSOD, and catalase). In contrast, CK2α overexpression inhibited AKT-mediated FoxO3a phosphorylation. This resulted in nuclear accumulation of FoxO3a, and elevated expression of its target genes. Therefore, these data indicate for the first time that CK2 downregulation stimulates ROS generation by inhibiting FoxO3a during premature senescence in human colon and breast cancer cells. - Highlights: • FoxO3a overexpression inhibited ROS production mediated by CK2α knockdown. • CK2α downregulation induced nuclear export of FoxO3a via AKT activation. • CK2α downregulation reduced transcription of FoxO3a target genes including SOD. • CK2α upregulation elevated nuclear import and target gene expression of FoxO3a. • This study indicates that CK2 can modulate the intracellular ROS level via FoxO3a.},
doi = {10.1016/J.BBRC.2016.07.106},
journal = {Biochemical and Biophysical Research Communications},
number = 1,
volume = 478,
place = {United States},
year = {Fri Sep 09 00:00:00 EDT 2016},
month = {Fri Sep 09 00:00:00 EDT 2016}
}