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Ryu JY, Oh J, Kim SM, Kim WG, Jeong H, Ahn SA, Kim SH, Jang JY, Yoo BC, Kim CW, Lee CE. SOCS1 counteracts ROS-mediated survival signals and promotes apoptosis by modulating cell cycle to increase radiosensitivity of colorectal cancer cells. BMB Rep 2022; 55:198-203. [PMID: 35321782 PMCID: PMC9058468] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2021] [Revised: 02/09/2022] [Accepted: 03/03/2022] [Indexed: 09/17/2023] Open
Abstract
As negative regulators of cytokine signaling pathways, suppressors of cytokine signaling (SOCS) proteins have been reported to possess both pro-tumor and anti-tumor functions. Our recent studies have demonstrated suppressive effects of SOCS1 on epithelial to mesenchymal signaling in colorectal cancer cells in response to fractionated ionizing radiation or oxidative stress. The objective of the present study was to determine the radiosensitizing action of SOCS1 as an anti-tumor mechanism in colorectal cancer cell model. In HCT116 cells exposed to ionizing radiation, SOCS1 over-expression shifted cell cycle arrest from G2/M to G1 and promoted radiation-induced apoptosis in a p53-dependent manner with down-regulation of cyclin B and up-regulation of p21. On the other hand, SOCS1 knock-down resulted in a reduced apoptosis with a decrease in G1 arrest. The regulatory action of SOCS1 on the radiation response was mediated by inhibition of radiation-induced Jak3/STAT3 and Erk activities, thereby blocking G1 to S transition. Radiation-induced early ROS signal was responsible for the activation of Jak3/Erk/STAT3 that led to cell survival response. Our data collectively indicate that SOCS1 can promote radiosensitivity of colorectal cancer cells by counteracting ROS-mediated survival signal, thereby blocking cell cycle progression from G1 to S. The resulting increase in G1 arrest with p53 activation then contributes to the promotion of apoptotic response upon radiation. Thus, induction of SOCS1 expression may increase therapeutic efficacy of radiation in tumors with low SOCS1 levels. [BMB Reports 2022; 55(4): 198-203].
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Affiliation(s)
- Ji-Yoon Ryu
- Laboratory of Immunology, Department of Biological Science, College of Natural Science, Sungkyunkwan University, Suwon 16419, Korea
| | - Jiyoung Oh
- Laboratory of Immunology, Department of Biological Science, College of Natural Science, Sungkyunkwan University, Suwon 16419, Korea
| | - Su-Min Kim
- Laboratory of Immunology, Department of Biological Science, College of Natural Science, Sungkyunkwan University, Suwon 16419, Korea
| | - Won-Gi Kim
- Laboratory of Immunology, Department of Biological Science, College of Natural Science, Sungkyunkwan University, Suwon 16419, Korea
- Colorectal Cancer Branch, Research Center, National Cancer Institute, Goyang 10408, Korea
| | - Hana Jeong
- Laboratory of Immunology, Department of Biological Science, College of Natural Science, Sungkyunkwan University, Suwon 16419, Korea
| | - Shin-Ae Ahn
- Laboratory of Immunology, Department of Biological Science, College of Natural Science, Sungkyunkwan University, Suwon 16419, Korea
| | - Seol-Hee Kim
- Laboratory of Immunology, Department of Biological Science, College of Natural Science, Sungkyunkwan University, Suwon 16419, Korea
| | - Ji-Young Jang
- Tumor Immunity Medical Research Center, Cancer Research Institute, Seoul National University College of Medicine, Seoul 03080, Korea
- Bioinfra Life Science Inc, Seoul 03127, Korea
| | - Byong Chul Yoo
- Colorectal Cancer Branch, Research Center, National Cancer Institute, Goyang 10408, Korea
| | - Chul Woo Kim
- Tumor Immunity Medical Research Center, Cancer Research Institute, Seoul National University College of Medicine, Seoul 03080, Korea
- Bioinfra Life Science Inc, Seoul 03127, Korea
| | - Choong-Eun Lee
- Laboratory of Immunology, Department of Biological Science, College of Natural Science, Sungkyunkwan University, Suwon 16419, Korea
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Abstract
The majority of acquired hearing loss, including presbycusis, is caused by irreversible damage to the sensorineural tissues of the cochlea. This article reviews the intracellular mechanisms that contribute to sensorineural damage in the cochlea, as well as the survival signaling pathways that can provide endogenous protection and tissue rescue. These data have primarily been generated in hearing loss not directly related to age. However, there is evidence that similar mechanisms operate in presbycusis. Moreover, accumulation of damage from other causes can contribute to age-related hearing loss (ARHL). Potential therapeutic interventions to balance opposing but interconnected cell damage and survival pathways, such as antioxidants, anti-apoptotics, and pro-inflammatory cytokine inhibitors, are also discussed.
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Affiliation(s)
- Ann C Y Wong
- Department of Surgery/Division of Otolaryngology, University of California, San Diego School of Medicine La Jolla, CA, USA ; Department of Physiology and Translational Neuroscience Facility, School of Medical Sciences, University of New South Wales Sydney, NSW, Australia
| | - Allen F Ryan
- Department of Surgery/Division of Otolaryngology, University of California, San Diego School of Medicine La Jolla, CA, USA ; Veterans Administration Medical Center La Jolla, CA, USA ; Department of Neurosciences, University of California, San Diego School of Medicine La Jolla, CA, USA
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