101
|
He Y, Tan D, Mi Y, Zhou Q, Ji S. Epigallocatechin-3-gallate attenuates cerebral cortex damage and promotes brain regeneration in acrylamide-treated rats. Food Funct 2017; 8:2275-2282. [DOI: 10.1039/c6fo01823h] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
ACR increased the rate of nestin-positive cells implying that ACR caused cell damage, and EGCG decreased the rates of nestin-positive cells against ACR suggesting that EGCG may promote cell regeneration.
Collapse
Affiliation(s)
- Yin He
- College of Food
- Shenyang Agricultural University
- Shenyang City 110866
- People's Republic of China
| | - Dehong Tan
- College of Food
- Shenyang Agricultural University
- Shenyang City 110866
- People's Republic of China
| | - Yan Mi
- College of Food
- Shenyang Agricultural University
- Shenyang City 110866
- People's Republic of China
| | - Qian Zhou
- College of Food
- Shenyang Agricultural University
- Shenyang City 110866
- People's Republic of China
| | - Shujuan Ji
- College of Food
- Shenyang Agricultural University
- Shenyang City 110866
- People's Republic of China
| |
Collapse
|
102
|
Nicolai S, Rossi A, Di Daniele N, Melino G, Annicchiarico-Petruzzelli M, Raschellà G. DNA repair and aging: the impact of the p53 family. Aging (Albany NY) 2016; 7:1050-65. [PMID: 26668111 PMCID: PMC4712331 DOI: 10.18632/aging.100858] [Citation(s) in RCA: 78] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Cells are constantly exposed to endogenous and exogenous factors that threaten the integrity of their DNA. The maintenance of genome stability is of paramount importance in the prevention of both cancer and aging processes. To deal with DNA damage, cells put into operation a sophisticated and coordinated mechanism, collectively known as DNA damage response (DDR). The DDR orchestrates different cellular processes, such as DNA repair, senescence and apoptosis. Among the key factors of the DDR, the related proteins p53, p63 and p73, all belonging to the same family of transcription factors, play multiple relevant roles. Indeed, the members of this family are directly involved in the induction of cell cycle arrest that is necessary to allow the cells to repair. Alternatively, they can promote cell death in case of prolonged or irreparable DNA damage. They also take part in a more direct task by modulating the expression of core factors involved in the process of DNA repair or by directly interacting with them. In this review we will analyze the fundamental roles of the p53 family in the aging process through their multifaceted function in DDR.
Collapse
Affiliation(s)
- Sara Nicolai
- Department of Experimental Medicine and Surgery, University of Rome "Tor Vergata", 00133 Rome, Italy
| | - Antonello Rossi
- Department of Experimental Medicine and Surgery, University of Rome "Tor Vergata", 00133 Rome, Italy
| | - Nicola Di Daniele
- Department of Experimental Medicine and Surgery, University of Rome "Tor Vergata", 00133 Rome, Italy
| | - Gerry Melino
- Department of Experimental Medicine and Surgery, University of Rome "Tor Vergata", 00133 Rome, Italy.,Medical Research Council, Toxicology Unit, Hodgkin Building, Leicester University, Leicester LE1 9HN, UK
| | | | - Giuseppe Raschellà
- ENEA Research Center Casaccia, Laboratory of Biosafety and Risk Assessment, 00123 Rome, Italy
| |
Collapse
|
103
|
Román F, Urra C, Porras O, Pino AM, Rosen CJ, Rodríguez JP. Real-Time H 2 O 2 Measurements in Bone Marrow Mesenchymal Stem Cells (MSCs) Show Increased Antioxidant Capacity in Cells From Osteoporotic Women. J Cell Biochem 2016; 118:585-593. [PMID: 27632788 DOI: 10.1002/jcb.25739] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2016] [Accepted: 09/13/2016] [Indexed: 01/21/2023]
Abstract
Oxidative stress (OS) derived from an increase in intracellular reactive oxygen species (ROS) is a major determinant of aging and lifespan. It has also been associated with several age-related disorders, like postmenopausal osteoporosis of Mesenchymal stem cells (MSCs). MSCs are the common precursors for osteoblasts and adipocytes; appropriate commitment and differentiation of MSCs into a specific phenotype is modulated, among other factors, by ROS balance. MSCs have shown more resistance to ROS than differentiated cells, and their redox status depends on complex and abundant anti-oxidant mechanisms. The purpose of this work was to analyze in real time, H2 O2 signaling in individual h-MSCs, and to compare the kinetic parameters of H2 O2 management by cells derived from both control (c-) and osteoporotic (o-) women. For these purposes, cells were infected with a genetically encoded fluorescent biosensor named HyPer, which is specific for detecting H2 O2 inside living cells. Subsequently, cells were sequentially challenged with 50 and 500 μM H2 O2 pulses, and the cellular response was recorded in real time. The results demonstrated adequate expression of the biosensor allowing registering fluorescence from HyPer at a single cell level. Comparison of the response of c- and o-MSCs to the oxidant challenges demonstrated improved antioxidant activity in o-MSCs. This was further corroborated by measuring the relative expression of mRNAs for catalase, superoxide dismutase-1, thioredoxine, and peroxiredoxine, as well as by cell-surviving capacity under short-term H2 O2 treatment. We conclude that functional differences exist between healthy and osteoporotic human MSCs. The mechanism for these differences requires further study. J. Cell. Biochem. 118: 585-593, 2017. © 2016 Wiley Periodicals, Inc.
Collapse
Affiliation(s)
- Flavia Román
- Laboratorio de Biología Celular, Instituto de Nutrición y Tecnología de los Alimentos, Universidad de Chile, Santiago, Chile
| | - Carla Urra
- Laboratorio de Biología Celular, Instituto de Nutrición y Tecnología de los Alimentos, Universidad de Chile, Santiago, Chile
| | - Omar Porras
- Laboratorio de Biología Celular, Instituto de Nutrición y Tecnología de los Alimentos, Universidad de Chile, Santiago, Chile
| | - Ana María Pino
- Laboratorio de Biología Celular, Instituto de Nutrición y Tecnología de los Alimentos, Universidad de Chile, Santiago, Chile
| | | | - Juan Pablo Rodríguez
- Laboratorio de Biología Celular, Instituto de Nutrición y Tecnología de los Alimentos, Universidad de Chile, Santiago, Chile
| |
Collapse
|
104
|
Chemopreventive effect and lack of genotoxicity and mutagenicity of the exopolysaccharide botryosphaeran on human lymphocytes. Toxicol In Vitro 2016; 36:18-25. [DOI: 10.1016/j.tiv.2016.06.008] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2016] [Revised: 06/20/2016] [Accepted: 06/30/2016] [Indexed: 12/24/2022]
|
105
|
TNFA gene variants related to the inflammatory status and its association with cellular aging: From the CORDIOPREV study. Exp Gerontol 2016; 83:56-62. [DOI: 10.1016/j.exger.2016.07.015] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2016] [Revised: 07/26/2016] [Accepted: 07/27/2016] [Indexed: 01/06/2023]
|
106
|
Abstract
Aging is a complex process not only influenced by inherited but also by several environmental factors. It is characterized by a progressive loss of function in multiple tissues, which leads to an increased probability of death. On the other hand, several morphological and histological changes are registered in aged skin that is mostly dependent on the cumulative exposure in environmental aging promoters, such as ultraviolet radiation. Understanding of individual pathogenesis and introduction of preventive measurements require objective assessment, i.e., the administration of biomarkers. Because of the complexity of skin aging, the exact definition of biomarkers is a major research challenge. In this article, we summarize the basic knowledge involving skin aging and its biomarkers.
Collapse
Affiliation(s)
- Theodora Kanaki
- Departments of Dermatology, Venereology, Allergology and Immunology, Dessau Medical Center, Auenweg 38, 06847, Dessau, Germany
| | - Evgenia Makrantonaki
- Departments of Dermatology, Venereology, Allergology and Immunology, Dessau Medical Center, Auenweg 38, 06847, Dessau, Germany
- Department of Dermatology and Allergology, University Ulm, Ulm, Germany
| | - Christos C Zouboulis
- Departments of Dermatology, Venereology, Allergology and Immunology, Dessau Medical Center, Auenweg 38, 06847, Dessau, Germany.
| |
Collapse
|
107
|
Nagano T, Nakano M, Nakashima A, Onishi K, Yamao S, Enari M, Kikkawa U, Kamada S. Identification of cellular senescence-specific genes by comparative transcriptomics. Sci Rep 2016; 6:31758. [PMID: 27545311 PMCID: PMC4992837 DOI: 10.1038/srep31758] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2016] [Accepted: 07/27/2016] [Indexed: 12/12/2022] Open
Abstract
Cellular senescence is defined as permanent cell cycle arrest induced by various stresses. Although the p53 transcriptional activity is essential for senescence induction, the downstream genes that are crucial for senescence remain unsolved. Here, by using a developed experimental system in which cellular senescence or apoptosis is induced preferentially by altering concentration of etoposide, a DNA-damaging drug, we compared gene expression profiles of senescent and apoptotic cells by microarray analysis. Subtraction of the expression profile of apoptotic cells identified 20 genes upregulated specifically in senescent cells. Furthermore, 6 out of 20 genes showed p53-dependent upregulation by comparing gene expression between p53-proficient and -deficient cells. These 6 genes were also upregulated during replicative senescence of normal human diploid fibroblasts, suggesting that upregulation of these genes is a general phenomenon in senescence. Among these genes, 2 genes (PRODH and DAO) were found to be directly regulated by p53, and ectopic expression of 4 genes (PRODH, DAO, EPN3, and GPR172B) affected senescence phenotypes induced by etoposide treatment. Collectively, our results identified several proteins as novel downstream effectors of p53-mediated senescence and provided new clues for further research on the complex signalling networks underlying the induction and maintenance of senescence.
Collapse
Affiliation(s)
- Taiki Nagano
- Biosignal Research Center, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe 657-8501, Japan.,Department of Biology, Graduate School of Science, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe 657-8501, Japan
| | - Masayuki Nakano
- Biosignal Research Center, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe 657-8501, Japan.,Department of Biology, Graduate School of Science, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe 657-8501, Japan
| | - Akio Nakashima
- Biosignal Research Center, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe 657-8501, Japan.,Department of Bioresource Science, Graduate School of Agricultural Science, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe 657-8501, Japan
| | - Kengo Onishi
- Biosignal Research Center, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe 657-8501, Japan.,Department of Biology, Graduate School of Science, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe 657-8501, Japan
| | - Shunsuke Yamao
- Biosignal Research Center, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe 657-8501, Japan.,Department of Biology, Graduate School of Science, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe 657-8501, Japan
| | - Masato Enari
- Division of Refractory and Advanced Cancer, National Cancer Center Research Institute, 5-1-1 Tsukiji, Chuo-ku, Tokyo 104-0045, Japan
| | - Ushio Kikkawa
- Biosignal Research Center, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe 657-8501, Japan.,Department of Bioresource Science, Graduate School of Agricultural Science, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe 657-8501, Japan
| | - Shinji Kamada
- Biosignal Research Center, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe 657-8501, Japan.,Department of Biology, Graduate School of Science, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe 657-8501, Japan
| |
Collapse
|
108
|
Shirakabe A, Ikeda Y, Sciarretta S, Zablocki DK, Sadoshima J. Aging and Autophagy in the Heart. Circ Res 2016; 118:1563-76. [PMID: 27174950 PMCID: PMC4869999 DOI: 10.1161/circresaha.116.307474] [Citation(s) in RCA: 307] [Impact Index Per Article: 38.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/14/2016] [Accepted: 02/15/2016] [Indexed: 12/15/2022]
Abstract
The aging population is increasing in developed countries. Because the incidence of cardiac disease increases dramatically with age, it is important to understand the molecular mechanisms through which the heart becomes either more or less susceptible to stress. Cardiac aging is characterized by the presence of hypertrophy, fibrosis, and accumulation of misfolded proteins and dysfunctional mitochondria. Macroautophagy (hereafter referred to as autophagy) is a lysosome-dependent bulk degradation mechanism that is essential for intracellular protein and organelle quality control. Autophagy and autophagic flux are generally decreased in aging hearts, and murine autophagy loss-of-function models develop exacerbated cardiac dysfunction that is accompanied by the accumulation of misfolded proteins and dysfunctional organelles. On the contrary, stimulation of autophagy generally improves cardiac function in mouse models of protein aggregation by removing accumulated misfolded proteins, dysfunctional mitochondria, and damaged DNA, thereby improving the overall cellular environment and alleviating aging-associated pathology in the heart. Increasing lines of evidence suggest that autophagy is required for many mechanisms that mediate lifespan extension, such as caloric restriction, in various organisms. These results raise the exciting possibility that autophagy may play an important role in combating the adverse effects of aging in the heart. In this review, we discuss the role of autophagy in the heart during aging, how autophagy alleviates age-dependent changes in the heart, and how the level of autophagy in the aging heart can be restored.
Collapse
Affiliation(s)
- Akihiro Shirakabe
- From the Department of Cell Biology and Molecular Medicine, Rutgers-New Jersey Medical School, Newark (A.S., Y.I., S.S., D.K.Z., J.S.); Department of Cardiovascular Medicine and Hypertension, Graduate School of Medical and Dental Science, Kagoshima University, Japan (Y.I.); Department of Medico-Surgical Sciences and Biotechnologies, Sapienza University of Rome, Rome, Italy (S.S.); and Department of AngioCardioNeurology, IRCCS Neuromed, Pozzilli, Italy (S.S.)
| | - Yoshiyuki Ikeda
- From the Department of Cell Biology and Molecular Medicine, Rutgers-New Jersey Medical School, Newark (A.S., Y.I., S.S., D.K.Z., J.S.); Department of Cardiovascular Medicine and Hypertension, Graduate School of Medical and Dental Science, Kagoshima University, Japan (Y.I.); Department of Medico-Surgical Sciences and Biotechnologies, Sapienza University of Rome, Rome, Italy (S.S.); and Department of AngioCardioNeurology, IRCCS Neuromed, Pozzilli, Italy (S.S.)
| | - Sebastiano Sciarretta
- From the Department of Cell Biology and Molecular Medicine, Rutgers-New Jersey Medical School, Newark (A.S., Y.I., S.S., D.K.Z., J.S.); Department of Cardiovascular Medicine and Hypertension, Graduate School of Medical and Dental Science, Kagoshima University, Japan (Y.I.); Department of Medico-Surgical Sciences and Biotechnologies, Sapienza University of Rome, Rome, Italy (S.S.); and Department of AngioCardioNeurology, IRCCS Neuromed, Pozzilli, Italy (S.S.)
| | - Daniela K Zablocki
- From the Department of Cell Biology and Molecular Medicine, Rutgers-New Jersey Medical School, Newark (A.S., Y.I., S.S., D.K.Z., J.S.); Department of Cardiovascular Medicine and Hypertension, Graduate School of Medical and Dental Science, Kagoshima University, Japan (Y.I.); Department of Medico-Surgical Sciences and Biotechnologies, Sapienza University of Rome, Rome, Italy (S.S.); and Department of AngioCardioNeurology, IRCCS Neuromed, Pozzilli, Italy (S.S.)
| | - Junichi Sadoshima
- From the Department of Cell Biology and Molecular Medicine, Rutgers-New Jersey Medical School, Newark (A.S., Y.I., S.S., D.K.Z., J.S.); Department of Cardiovascular Medicine and Hypertension, Graduate School of Medical and Dental Science, Kagoshima University, Japan (Y.I.); Department of Medico-Surgical Sciences and Biotechnologies, Sapienza University of Rome, Rome, Italy (S.S.); and Department of AngioCardioNeurology, IRCCS Neuromed, Pozzilli, Italy (S.S.).
| |
Collapse
|
109
|
Einor D, Bonisoli-Alquati A, Costantini D, Mousseau TA, Møller AP. Ionizing radiation, antioxidant response and oxidative damage: A meta-analysis. THE SCIENCE OF THE TOTAL ENVIRONMENT 2016; 548-549:463-471. [PMID: 26851726 DOI: 10.1016/j.scitotenv.2016.01.027] [Citation(s) in RCA: 71] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2015] [Revised: 01/06/2016] [Accepted: 01/06/2016] [Indexed: 05/22/2023]
Abstract
One mechanism proposed as a link between exposure to ionizing radiation and detrimental effects on organisms is oxidative damage. To test this hypothesis, we surveyed the scientific literature on the effects of chronic low-dose ionizing radiation (LDIR) on antioxidant responses and oxidative damage. We found 40 publications and 212 effect sizes for antioxidant responses and 288 effect sizes for effects of oxidative damage. We performed a meta-analysis of signed and unsigned effect sizes. We found large unsigned effects for both categories (0.918 for oxidative damage; 0.973 for antioxidant response). Mean signed effect size weighted by sample size was 0.276 for oxidative damage and -0.350 for antioxidant defenses, with significant heterogeneity among effects for both categories, implying that ionizing radiation caused small to intermediate increases in oxidative damage and small to intermediate decreases in antioxidant defenses. Our estimates are robust, as shown by very high fail-safe numbers. Species, biological matrix (tissue, blood, sperm) and age predicted the magnitude of effects for oxidative damage as well as antioxidant response. Meta-regression models showed that effect sizes for oxidative damage varied among species and age classes, while effect sizes for antioxidant responses varied among species and biological matrices. Our results are consistent with the description of mechanisms underlying pathological effects of chronic exposure to LDIR. Our results also highlight the importance of resistance to oxidative stress as one possible mechanism associated with variation in species responses to LDIR-contaminated areas.
Collapse
Affiliation(s)
- D Einor
- Department of Biological Sciences, University of South Carolina, Columbia, SC 29208, USA.
| | - A Bonisoli-Alquati
- Department of Biological Sciences, University of South Carolina, Columbia, SC 29208, USA; School of Renewable Natural Resources, Louisiana State University AgCenter, Baton Rouge, LA 70803, USA.
| | - D Costantini
- Department of Biology, University of Antwerp, Wilrijk, B-2610, Antwerp, Belgium.
| | - T A Mousseau
- Department of Biological Sciences, University of South Carolina, Columbia, SC 29208, USA; Faculty of Bioscience and Biotechnology, Chubu University, Kasugai, Japan.
| | - A P Møller
- Laboratoire d'Ecologie, Systématique et Evolution, CNRS UMR 8079, Université Paris-Sud, Bâtiment 362, F-91405 Orsay Cedex, France.
| |
Collapse
|
110
|
Wang F, Cai F, Shi R, Wang XH, Wu XT. Aging and age related stresses: a senescence mechanism of intervertebral disc degeneration. Osteoarthritis Cartilage 2016; 24:398-408. [PMID: 26455958 DOI: 10.1016/j.joca.2015.09.019] [Citation(s) in RCA: 296] [Impact Index Per Article: 37.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/02/2015] [Revised: 09/13/2015] [Accepted: 09/30/2015] [Indexed: 02/02/2023]
Abstract
Intervertebral disc (IVD) degeneration is a complicated process that involves both age-related change and tissue damage caused by multiple stresses. In a degenerative IVD, cellular senescence accumulates and is associated with reduced proliferation, compromised self-repair, increased inflammatory response, and enhanced catabolic metabolism. In this review, we decipher the senescence mechanism of IVD degeneration (IVDD) by interpreting how aging coordinates with age-related, microenvironment-derived stresses in promoting disc cell senescence and accelerating IVDD. After chronic and prolonged replication, cell senescence may occur as a natural part of the disc aging process, but can potentially be accelerated by growth factor deficiency, oxidative accumulation, and inflammatory irritation. While acute disc injury, excessive mechanical overloading, diabetes, and chronic tobacco smoking contribute to the amplification of senescence-inducing stresses, the avascular nature of IVD impairs the immune-clearance of the senescent disc cells, which accumulate in cell clusters, demonstrate inflammatory and catabolic phenotypes, deteriorate disc microenvironment, and accelerate IVDD. Anti-senescence strategies, including telomerase transduction, supply of growth factors, and blocking cell cycle inhibitors, have been shown to be feasible in rescuing disc cells from early senescence, but their efficiency for disc regeneration requires more in vivo validations. Guidelines dedicated to avoiding or alleviating senescence-inducing stresses might decelerate cellular senescence and benefit patients with IVD degenerative diseases.
Collapse
Affiliation(s)
- F Wang
- Department of Spine Surgery, Zhongda Hospital, School of Medicine, Southeast University, 87# Dingjiaqiao Road, 210009 Nanjing, China; Surgery Research Center, School of Medicine, Southeast University, 87# Dingjiaqiao Road, 210009 Nanjing, China.
| | - F Cai
- Department of Spine Surgery, Zhongda Hospital, School of Medicine, Southeast University, 87# Dingjiaqiao Road, 210009 Nanjing, China; Surgery Research Center, School of Medicine, Southeast University, 87# Dingjiaqiao Road, 210009 Nanjing, China.
| | - R Shi
- Department of Spine Surgery, Zhongda Hospital, School of Medicine, Southeast University, 87# Dingjiaqiao Road, 210009 Nanjing, China; Surgery Research Center, School of Medicine, Southeast University, 87# Dingjiaqiao Road, 210009 Nanjing, China.
| | - X-H Wang
- Department of Spine Surgery, Zhongda Hospital, School of Medicine, Southeast University, 87# Dingjiaqiao Road, 210009 Nanjing, China; Surgery Research Center, School of Medicine, Southeast University, 87# Dingjiaqiao Road, 210009 Nanjing, China.
| | - X-T Wu
- Department of Spine Surgery, Zhongda Hospital, School of Medicine, Southeast University, 87# Dingjiaqiao Road, 210009 Nanjing, China; Surgery Research Center, School of Medicine, Southeast University, 87# Dingjiaqiao Road, 210009 Nanjing, China.
| |
Collapse
|
111
|
Ren C, Zhang J, Yan W, Zhang Y, Chen X. RNA-binding Protein PCBP2 Regulates p73 Expression and p73-dependent Antioxidant Defense. J Biol Chem 2016; 291:9629-37. [PMID: 26907686 DOI: 10.1074/jbc.m115.712125] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2015] [Indexed: 11/06/2022] Open
Abstract
TAp73, a member of the p53 family tumor suppressors, plays a critical rule in tumor suppression and neuronal development. However, how p73 activity is controlled at the posttranscriptional level is not well understood. Here, we showed that TAp73 activity is regulated by RNA-binding protein PCBP2. Specifically, we found that knockdown or knock-out of PCBP2 reduces, whereas ectopic expression of PCBP2 increases, TAp73 expression. We also showed that PCBP2 is necessary for p73 mRNA stability via the CU-rich elements in p73 3'-UTR. To uncover the biological relevance of PCBP2-regulated TAp73 expression, we showed that ectopic expression of PCBP2 inhibits, whereas knockdown or knock-out of PCBP2 increases, the production of reactive oxygen species (ROS) in a TAp73-dependent manner. Additionally, we found that glutaminase 2 (GLS2), a modulator of p73-dependent antioxidant defense, is also involved in PCBP2-regulated ROS production. Moreover, we generated PCBP2-deficient mice and primary mouse embryonic fibroblasts (MEFs) and showed that loss of PCBP2 leads to decreased p73 expression and, subsequently, increased ROS production and accelerated cellular senescence. Together, our data suggest that PCBP2 regulates p73 expression via mRNA stability and p73-dependent biological function in ROS production and cellular senescence.
Collapse
Affiliation(s)
- Cong Ren
- From the Comparative Oncology Laboratory, Schools of Medicine and Veterinary Medicine, University of California, Davis, California 95616
| | - Jin Zhang
- From the Comparative Oncology Laboratory, Schools of Medicine and Veterinary Medicine, University of California, Davis, California 95616
| | - Wensheng Yan
- From the Comparative Oncology Laboratory, Schools of Medicine and Veterinary Medicine, University of California, Davis, California 95616
| | - Yanhong Zhang
- From the Comparative Oncology Laboratory, Schools of Medicine and Veterinary Medicine, University of California, Davis, California 95616
| | - Xinbin Chen
- From the Comparative Oncology Laboratory, Schools of Medicine and Veterinary Medicine, University of California, Davis, California 95616
| |
Collapse
|
112
|
Félix LM, Vidal AM, Serafim C, Valentim AM, Antunes LM, Campos S, Matos M, Monteiro SM, Coimbra AM. Ketamine-induced oxidative stress at different developmental stages of zebrafish (Danio rerio) embryos. RSC Adv 2016. [DOI: 10.1039/c6ra08298j] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The changes induced by ketamine exposure were developmental stage-dependent, and related with the gradual development of the antioxidant defense system of the embryo, which is dependent on changes in energy-sensing pathways.
Collapse
Affiliation(s)
- Luís M. Félix
- Centre for the Research and Technology of Agro-Environmental and Biological Sciences (CITAB)
- University of Trás-os-Montes and Alto Douro (UTAD)
- Vila Real
- Portugal
- Laboratory Animal Science (LAS)
| | - Ana M. Vidal
- Life Sciences and Environment School (ECVA)
- University of Trás-os-Montes and Alto Douro (UTAD)
- Vila Real
- Portugal
| | - Cindy Serafim
- Life Sciences and Environment School (ECVA)
- University of Trás-os-Montes and Alto Douro (UTAD)
- Vila Real
- Portugal
| | - Ana M. Valentim
- Centre for the Research and Technology of Agro-Environmental and Biological Sciences (CITAB)
- University of Trás-os-Montes and Alto Douro (UTAD)
- Vila Real
- Portugal
- Laboratory Animal Science (LAS)
| | - Luís M. Antunes
- Centre for the Research and Technology of Agro-Environmental and Biological Sciences (CITAB)
- University of Trás-os-Montes and Alto Douro (UTAD)
- Vila Real
- Portugal
- Laboratory Animal Science (LAS)
| | - Sónia Campos
- Centre for the Research and Technology of Agro-Environmental and Biological Sciences (CITAB)
- University of Trás-os-Montes and Alto Douro (UTAD)
- Vila Real
- Portugal
- Laboratory Animal Science (LAS)
| | - Manuela Matos
- Biosystems & Integrative Sciences Institute (BioISI)
- Faculty of Sciences
- University of Lisboa
- Lisboa
- Portugal
| | - Sandra M. Monteiro
- Centre for the Research and Technology of Agro-Environmental and Biological Sciences (CITAB)
- University of Trás-os-Montes and Alto Douro (UTAD)
- Vila Real
- Portugal
| | - Ana M. Coimbra
- Centre for the Research and Technology of Agro-Environmental and Biological Sciences (CITAB)
- University of Trás-os-Montes and Alto Douro (UTAD)
- Vila Real
- Portugal
| |
Collapse
|
113
|
Glucose Oxidase Induces Cellular Senescence in Immortal Renal Cells through ILK by Downregulating Klotho Gene Expression. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2015; 2015:416738. [PMID: 26583057 PMCID: PMC4637093 DOI: 10.1155/2015/416738] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/08/2015] [Accepted: 05/17/2015] [Indexed: 02/07/2023]
Abstract
Cellular senescence can be prematurely induced by oxidative stress involved in aging. In this work, we were searching for novel intermediaries in oxidative stress-induced senescence, focusing our interest on integrin-linked kinase (ILK), a scaffold protein at cell-extracellular matrix (ECM) adhesion sites, and on the Klotho gene. Cultured renal cells were treated with glucose oxidase (GOx) for long time periods. GOx induced senescence, increasing senescence associated β-galactosidase activity and the expression of p16. In parallel, GOx increased ILK protein expression and activity. Ectopic overexpression of ILK in cells increased p16 expression, even in the absence of GOx, whereas downregulation of ILK inhibited the increase in p16 due to oxidative stress. Additionally, GOx reduced Klotho gene expression and cells overexpressing Klotho protein did not undergo senescence after GOx addition. We demonstrated a direct link between ILK and Klotho since silencing ILK expression in cells and mice increases Klotho expression and reduces p53 and p16 expression in renal cortex. In conclusion, oxidative stress induces cellular senescence in kidney cells by increasing ILK protein expression and activity, which in turn reduces Klotho expression. We hereby present ILK as a novel downregulator of Klotho gene expression.
Collapse
|
114
|
Al-Halabi R, Abou Merhi R, Chakilam S, El-Baba C, Hamade E, Di Fazio P, Ocker M, Schneider-Stock R, Gali-Muhtasib H. Gallotannin is a DNA damaging compound that induces senescence independently of p53 and p21 in human colon cancer cells. Mol Carcinog 2015; 54:1037-50. [PMID: 24798519 DOI: 10.1002/mc.22172] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2013] [Revised: 04/04/2014] [Accepted: 04/07/2014] [Indexed: 02/05/2023]
Abstract
The plant secondary metabolite gallotannin (GT) is the simplest hydrolyzable tannin shown to have anti-carcinogenic properties in several cell lines and to inhibit tumor development in different animal models. Here, we determined if GT induces senescence and DNA damage and investigated the involvement of p53 and p21 in this response. Using HCT116 human colon cancer cells wildtype for p53(+/+) /p21(+/+) and null for p53(+/+) /p21(-/-) or p53(-/-) /p21(+/+) , we found that GT induces senescence independently of p21 and p53. GT was found to increase the production of reactive oxygen species (ROS) by altering the redox balance in the cell, mainly by reducing the levels of glutathione and superoxide dismutase (SOD). Using the key antioxidants N-acetyl cysteine, dithiothreitol, SOD, and catalase, we showed that ROS were partially involved in the senescence response. Furthermore, GT-induced cell cycle arrest in S-phase in all HCT116 cell lines. At later time points, we noticed that p53 and p21 null cells escaped complete arrest and re-entered cell cycle provoking higher rates of multinucleation. The senescence induction by GT was irreversible and was accompanied by significant DNA damage as evidenced by p-H2AX staining. Our findings indicate that GT is an interesting anti colon cancer agent which warrants further study.
Collapse
Affiliation(s)
- Racha Al-Halabi
- Department of Biology, Faculty of Sciences, EDST, Lebanese University, Beirut, Lebanon
- Institute for Surgical Research, Philipps University of Marburg, Marburg, Germany
| | - Raghida Abou Merhi
- Department of Biology, Faculty of Sciences, EDST, Lebanese University, Beirut, Lebanon
| | - Saritha Chakilam
- Experimental Tumorpathology, Institut of Pathology, University of Erlangen-Nürnberg, Erlangen, Germany
| | - Chirine El-Baba
- Experimental Tumorpathology, Institut of Pathology, University of Erlangen-Nürnberg, Erlangen, Germany
| | - Eva Hamade
- Department of Biology, Faculty of Sciences, EDST, Lebanese University, Beirut, Lebanon
| | - Pietro Di Fazio
- Institute for Surgical Research, Philipps University of Marburg, Marburg, Germany
| | - Matthias Ocker
- Institute for Surgical Research, Philipps University of Marburg, Marburg, Germany
| | - Regine Schneider-Stock
- Experimental Tumorpathology, Institut of Pathology, University of Erlangen-Nürnberg, Erlangen, Germany
| | | |
Collapse
|
115
|
Marthandan S, Priebe S, Groth M, Guthke R, Platzer M, Hemmerich P, Diekmann S. Hormetic effect of rotenone in primary human fibroblasts. Immun Ageing 2015; 12:11. [PMID: 26380578 PMCID: PMC4572608 DOI: 10.1186/s12979-015-0038-8] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2015] [Accepted: 09/01/2015] [Indexed: 02/08/2023]
Abstract
BACKGROUND Rotenone inhibits the electron transfer from complex I to ubiquinone, in this way interfering with the electron transport chain in mitochondria. This chain of events induces increased levels of intracellular reactive oxygen species, which in turn can contribute to acceleration of telomere shortening and induction of DNA damage, ultimately resulting in aging. In this study, we investigated the effect of rotenone treatment in human fibroblast strains. RESULTS For the first time we here describe that rotenone treatment induced a hormetic effect in human fibroblast strains. We identified a number of genes which were commonly differentially regulated due to low dose rotenone treatment in fibroblasts independent of their cell origin. However, these genes were not among the most strongly differentially regulated genes in the fibroblast strains on treatment with rotenone. Thus, if there is a common hormesis regulation, it is superimposed by cell strain specific individual responses. We found the rotenone induced differential regulation of pathways common between the two fibroblast strains, being weaker than the pathways individually regulated in the single fibroblast cell strains. Furthermore, within the common pathways different genes were responsible for this different regulation. Thus, rotenone induced hormesis was related to a weak pathway signal, superimposed by a stronger individual cellular response, a situation as found for the differentially expressed genes. CONCLUSION We found that the concept of hormesis also applies to in vitro aging of primary human fibroblasts. However, in depth analysis of the genes as well as the pathways differentially regulated due to rotenone treatment revealed cellular hormesis being related to weak signals which are superimposed by stronger individual cell-internal responses. This would explain that in general hormesis is a small effect. Our data indicate that the observed hormetic phenotype does not result from a specific strong well-defined gene or pathway regulation but from weak common cellular processes induced by low levels of reactive oxygen species. This conclusion also holds when comparing our results with those obtained for C. elegans in which the same low dose rotenone level induced a life span extending, thus hormetic effect.
Collapse
Affiliation(s)
- Shiva Marthandan
- />Leibniz-Institute for Age Research - Fritz Lipmann Institute e.V. (FLI), Beutenbergstrasse 11, D-07745 Jena, Germany
| | - Steffen Priebe
- />Leibniz Institute for Natural Product Research and Infection Biology - Hans-Knöll-Institute e.V. (HKI), Jena, Germany
| | - Marco Groth
- />Leibniz-Institute for Age Research - Fritz Lipmann Institute e.V. (FLI), Beutenbergstrasse 11, D-07745 Jena, Germany
| | - Reinhard Guthke
- />Leibniz Institute for Natural Product Research and Infection Biology - Hans-Knöll-Institute e.V. (HKI), Jena, Germany
| | - Matthias Platzer
- />Leibniz-Institute for Age Research - Fritz Lipmann Institute e.V. (FLI), Beutenbergstrasse 11, D-07745 Jena, Germany
| | - Peter Hemmerich
- />Leibniz-Institute for Age Research - Fritz Lipmann Institute e.V. (FLI), Beutenbergstrasse 11, D-07745 Jena, Germany
| | - Stephan Diekmann
- />Leibniz-Institute for Age Research - Fritz Lipmann Institute e.V. (FLI), Beutenbergstrasse 11, D-07745 Jena, Germany
| |
Collapse
|
116
|
Lemey C, Milhavet O, Lemaitre JM. iPSCs as a major opportunity to understand and cure age-related diseases. Biogerontology 2015; 16:399-410. [DOI: 10.1007/s10522-015-9579-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2015] [Accepted: 04/28/2015] [Indexed: 01/21/2023]
|
117
|
Cellular Mechanisms of Oxidative Stress and Action in Melanoma. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2015; 2015:481782. [PMID: 26064422 PMCID: PMC4438193 DOI: 10.1155/2015/481782] [Citation(s) in RCA: 72] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/22/2014] [Accepted: 04/21/2015] [Indexed: 12/14/2022]
Abstract
Most melanomas occur on the skin, but a small percentage of these life-threatening cancers affect other parts of the body, such as the eye and mucous membranes, including the mouth. Given that most melanomas are caused by ultraviolet radiation (UV) exposure, close attention has been paid to the impact of oxidative stress on these tumors. The possibility that key epigenetic enzymes cannot act on a DNA altered by oxidative stress has opened new perspectives. Therefore, much attention has been paid to the alteration of DNA methylation by oxidative stress. We review the current evidence about (i) the role of oxidative stress in melanoma initiation and progression; (ii) the mechanisms by which ROS influence the DNA methylation pattern of transformed melanocytes; (iii) the transformative potential of oxidative stress-induced changes in global and/or local gene methylation and expression; (iv) the employment of this epimutation as a biomarker for melanoma diagnosis, prognosis, and drug resistance evaluation; (v) the impact of this new knowledge in clinical practice for melanoma treatment.
Collapse
|
118
|
TIGAR regulates DNA damage and repair through pentosephosphate pathway and Cdk5-ATM pathway. Sci Rep 2015; 5:9853. [PMID: 25928429 PMCID: PMC4415581 DOI: 10.1038/srep09853] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2014] [Accepted: 03/20/2015] [Indexed: 12/20/2022] Open
Abstract
Previous study revealed that the protective effect of TIGAR in cell survival is mediated through the increase in PPP (pentose phosphate pathway) flux. However, it remains unexplored if TIGAR plays an important role in DNA damage and repair. This study investigated the role of TIGAR in DNA damage response (DDR) induced by genotoxic drugs and hypoxia in tumor cells. Results showed that TIGAR was increased and relocated to the nucleus after epirubicin or hypoxia treatment in cancer cells. Knockdown of TIGAR exacerbated DNA damage and the effects were partly reversed by the supplementation of PPP products NADPH, ribose, or the ROS scavenger NAC. Further studies with pharmacological and genetic approaches revealed that TIGAR regulated the phosphorylation of ATM, a key protein in DDR, through Cdk5. The Cdk5-AMT signal pathway involved in regulation of DDR by TIGAR defines a new role of TIGAR in cancer cell survival and it suggests that TIGAR may be a therapeutic target for cancers.
Collapse
|
119
|
MOZ (MYST3, KAT6A) inhibits senescence via the INK4A-ARF pathway. Oncogene 2015; 34:5807-20. [DOI: 10.1038/onc.2015.33] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2014] [Revised: 12/01/2014] [Accepted: 01/23/2015] [Indexed: 12/21/2022]
|
120
|
Ziegler DV, Wiley CD, Velarde MC. Mitochondrial effectors of cellular senescence: beyond the free radical theory of aging. Aging Cell 2015; 14:1-7. [PMID: 25399755 PMCID: PMC4310776 DOI: 10.1111/acel.12287] [Citation(s) in RCA: 236] [Impact Index Per Article: 26.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/17/2014] [Indexed: 12/22/2022] Open
Abstract
Cellular senescence is a process that results from a variety of stresses, leading to a state of irreversible growth arrest. Senescent cells accumulate during aging and have been implicated in promoting a variety of age-related diseases. Mitochondrial stress is an effective inducer of cellular senescence, but the mechanisms by which mitochondria regulate permanent cell growth arrest are largely unexplored. Here, we review some of the mitochondrial signaling pathways that participate in establishing cellular senescence. We discuss the role of mitochondrial reactive oxygen species (ROS), mitochondrial dynamics (fission and fusion), the electron transport chain (ETC), bioenergetic balance, redox state, metabolic signature, and calcium homeostasis in controlling cellular growth arrest. We emphasize that multiple mitochondrial signaling pathways, besides mitochondrial ROS, can induce cellular senescence. Together, these pathways provide a broader perspective for studying the contribution of mitochondrial stress to aging, linking mitochondrial dysfunction and aging through the process of cellular senescence.
Collapse
Affiliation(s)
- Dorian V. Ziegler
- Département de Biologie Ecole Normale Supérieure de Lyon 46 allée d'Italie Lyon 69007 France
- Buck Institute for Research on Aging 8001 Redwood Blvd. Novato CA 94945 USA
| | | | - Michael C. Velarde
- Buck Institute for Research on Aging 8001 Redwood Blvd. Novato CA 94945 USA
| |
Collapse
|
121
|
Piano A, Titorenko VI. The Intricate Interplay between Mechanisms Underlying Aging and Cancer. Aging Dis 2015; 6:56-75. [PMID: 25657853 PMCID: PMC4306474 DOI: 10.14336/ad.2014.0209] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2013] [Revised: 01/30/2014] [Accepted: 02/09/2014] [Indexed: 12/15/2022] Open
Abstract
Age is the major risk factor in the incidence of cancer, a hyperplastic disease associated with aging. Here, we discuss the complex interplay between mechanisms underlying aging and cancer as a reciprocal relationship. This relationship progresses with organismal age, follows the history of cell proliferation and senescence, is driven by common or antagonistic causes underlying aging and cancer in an age-dependent fashion, and is maintained via age-related convergent and divergent mechanisms. We summarize our knowledge of these mechanisms, outline the most important unanswered questions and suggest directions for future research.
Collapse
Affiliation(s)
- Amanda Piano
- Department of Biology, Concordia University, Montreal, Quebec, Canada
| | | |
Collapse
|
122
|
Nair RR, Bagheri M, Saini DK. Temporally distinct roles of ATM and ROS in genotoxic-stress-dependent induction and maintenance of cellular senescence. J Cell Sci 2015; 128:342-53. [DOI: 10.1242/jcs.159517] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
ABSTRACT
Cells exposed to genotoxic stress induce cellular senescence through a DNA damage response (DDR) pathway regulated by ATM kinase and reactive oxygen species (ROS). Here, we show that the regulatory roles for ATM kinase and ROS differ during induction and maintenance of cellular senescence. Cells treated with different genotoxic agents were analyzed using specific pathway markers and inhibitors to determine that ATM kinase activation is directly proportional to the dose of the genotoxic stress and that senescence initiation is not dependent on ROS or the p53 status of cells. Cells in which ROS was quenched still activated ATM and initiated the DDR when insulted, and progressed normally to senescence. By contrast, maintenance of a viable senescent state required the presence of ROS as well as activated ATM. Inhibition or removal of either of the components caused cell death in senescent cells, through a deregulated ATM–ROS axis. Overall, our work demonstrates existence of an intricate temporal hierarchy between genotoxic stress, DDR and ROS in cellular senescence. Our model reports the existence of different stages of cellular senescence with distinct regulatory networks.
Collapse
Affiliation(s)
- Raji R. Nair
- Department of Molecular Reproduction, Development and Genetics, Indian Institute of Science, Bangalore 560012, India
| | - Meisam Bagheri
- Department of Molecular Reproduction, Development and Genetics, Indian Institute of Science, Bangalore 560012, India
| | - Deepak Kumar Saini
- Department of Molecular Reproduction, Development and Genetics, Indian Institute of Science, Bangalore 560012, India
| |
Collapse
|
123
|
Phosphorylation of the translation initiation factor eIF2α at serine 51 determines the cell fate decisions of Akt in response to oxidative stress. Cell Death Dis 2015; 6:e1591. [PMID: 25590801 PMCID: PMC4669752 DOI: 10.1038/cddis.2014.554] [Citation(s) in RCA: 82] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2014] [Revised: 10/29/2014] [Accepted: 11/26/2014] [Indexed: 12/15/2022]
Abstract
Phosphorylation of the α subunit of the translation initiation factor eIF2 at serine 51 (eIF2αP) is a master regulator of cell adaptation to various forms of stress with implications in antitumor treatments with chemotherapeutic drugs. Herein, we demonstrate that genetic loss of the eIF2α kinases PERK and GCN2 or impaired eIF2αP by genetic means renders immortalized mouse fibroblasts as well as human tumor cells increasingly susceptible to death by oxidative stress. We also show that eIF2αP facilitates Akt activation in cells subjected to oxidative insults. However, whereas Akt activation has a pro-survival role in eIF2αP-proficient cells, the lesser amount of activated Akt in eIF2αP-deficient cells promotes death. At the molecular level, we demonstrate that eIF2αP acts through an ATF4-independent mechanism to control Akt activity via the regulation of mTORC1. Specifically, eIF2αP downregulates mTORC1 activity, which in turn relieves the feedback inhibition of PI3K resulting in the upregulation of the mTORC2-Akt arm. Inhibition of mTORC1 by rapamycin restores Akt activity in eIF2αP-deficient cells but renders them highly susceptible to Akt-mediated death by oxidative stress. Our data demonstrate that eIF2αP acts as a molecular switch that dictates either cell survival or death by activated Akt in response to oxidative stress. Hence, we propose that inactivation of eIF2αP may be a suitable approach to unleash the killing power of Akt in tumor cells treated with pro-oxidant drugs.
Collapse
|
124
|
Chan ASL, Mowla SN, Arora P, Jat PS. Tumour suppressors and cellular senescence. IUBMB Life 2014; 66:812-22. [PMID: 25557529 DOI: 10.1002/iub.1335] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2014] [Accepted: 12/01/2014] [Indexed: 01/09/2023]
Abstract
Cellular senescence is a stable cell cycle arrest that normal cells undergo in response to a variety of intrinsic and extrinsic stimuli, including progressive telomere shortening, changes in telomeric structure or other forms of genotoxic as well nongenotoxic stress. Senescence is thought to have originated as a remodelling program that is active in embryonic development and acts as a key tumour suppressor mechanism during the reproductive stage in early adult life, by leading to the removal of potentially cancerous cells. However, in later adult life, it promotes organismal aging by compromising tissue repair and regeneration due to the accumulation of senescent cells, depletion of stem/progenitor cells and secretion of an array of inflammatory cytokines, chemokines and matrix metalloproteases. Whilst suppressing tumour formation in the senescent cells, these inflammatory cytokines, chemokines and metalloproteases can promote tumour progression and metastasis in the neighbouring cells. Herein, we review the molecular pathways that underlie cellular senescence and how it contributes towards tumour suppression.
Collapse
Affiliation(s)
- Adelyne S L Chan
- Department of Neurodegenerative Disease and MRC Prion Unit, UCL Institute of Neurology, Queen Square, London, WC1N 3BG
| | | | | | | |
Collapse
|
125
|
Zhang HM, Zhang Y. Melatonin: a well-documented antioxidant with conditional pro-oxidant actions. J Pineal Res 2014; 57:131-46. [PMID: 25060102 DOI: 10.1111/jpi.12162] [Citation(s) in RCA: 576] [Impact Index Per Article: 57.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/08/2014] [Accepted: 07/18/2014] [Indexed: 12/19/2022]
Abstract
Melatonin (N-acetyl-5-methoxytryptamine), an indoleamine produced in many organs including the pineal gland, was initially characterized as a hormone primarily involved in circadian regulation of physiological and neuroendocrine function. Subsequent studies found that melatonin and its metabolic derivatives possess strong free radical scavenging properties. These metabolites are potent antioxidants against both ROS (reactive oxygen species) and RNS (reactive nitrogen species). The mechanisms by which melatonin and its metabolites protect against free radicals and oxidative stress include direct scavenging of radicals and radical products, induction of the expression of antioxidant enzymes, reduction of the activation of pro-oxidant enzymes, and maintenance of mitochondrial homeostasis. In both in vitro and in vivo studies, melatonin has been shown to reduce oxidative damage to lipids, proteins and DNA under a very wide set of conditions where toxic derivatives of oxygen are known to be produced. Although the vast majority of studies proved the antioxidant capacity of melatonin and its derivatives, a few studies using cultured cells found that melatonin promoted the generation of ROS at pharmacological concentrations (μm to mm range) in several tumor and nontumor cells; thus, melatonin functioned as a conditional pro-oxidant. Mechanistically, melatonin may stimulate ROS production through its interaction with calmodulin. Also, melatonin may interact with mitochondrial complex III or mitochondrial transition pore to promote ROS production. Whether melatonin functions as a pro-oxidant under in vivo conditions is not well documented; thus, whether the reported in vitro pro-oxidant actions come into play in live organisms remains to be established.
Collapse
Affiliation(s)
- Hong-Mei Zhang
- Department of Clinical Oncology, Xijing Hospital, The Fourth Military Medical University, Xi'an, China
| | | |
Collapse
|
126
|
Reactive oxygen species promotes cellular senescence in normal human epidermal keratinocytes through epigenetic regulation of p16INK4a. Biochem Biophys Res Commun 2014; 452:622-8. [DOI: 10.1016/j.bbrc.2014.08.123] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2014] [Accepted: 08/23/2014] [Indexed: 11/20/2022]
|
127
|
Chung KW, Choi YJ, Park MH, Jang EJ, Kim DH, Park BH, Yu BP, Chung HY. Molecular Insights into SIRT1 Protection Against UVB-Induced Skin Fibroblast Senescence by Suppression of Oxidative Stress and p53 Acetylation. J Gerontol A Biol Sci Med Sci 2014; 70:959-68. [DOI: 10.1093/gerona/glu137] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2014] [Accepted: 07/10/2014] [Indexed: 12/20/2022] Open
|
128
|
Tran D, Bergholz J, Zhang H, He H, Wang Y, Zhang Y, Li Q, Kirkland JL, Xiao Z. Insulin-like growth factor-1 regulates the SIRT1-p53 pathway in cellular senescence. Aging Cell 2014; 13:669-78. [PMID: 25070626 PMCID: PMC4118446 DOI: 10.1111/acel.12219] [Citation(s) in RCA: 113] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/23/2014] [Indexed: 12/21/2022] Open
Abstract
Cellular senescence, which is known to halt proliferation of aged and stressed cells, plays a key role against cancer development and is also closely associated with organismal aging. While increased insulin-like growth factor (IGF) signaling induces cell proliferation, survival and cancer progression, disrupted IGF signaling is known to enhance longevity concomitantly with delay in aging processes. The molecular mechanisms involved in the regulation of aging by IGF signaling and whether IGF regulates cellular senescence are still poorly understood. In this study, we demonstrate that IGF-1 exerts a dual function in promoting cell proliferation as well as cellular senescence. While acute IGF-1 exposure promotes cell proliferation and is opposed by p53, prolonged IGF-1 treatment induces premature cellular senescence in a p53-dependent manner. We show that prolonged IGF-1 treatment inhibits SIRT1 deacetylase activity, resulting in increased p53 acetylation as well as p53 stabilization and activation, thus leading to premature cellular senescence. In addition, either expression of SIRT1 or inhibition of p53 prevented IGF-1-induced premature cellular senescence. Together, these findings suggest that p53 acts as a molecular switch in monitoring IGF-1-induced proliferation and premature senescence, and suggest a possible molecular connection involving IGF-1-SIRT1-p53 signaling in cellular senescence and aging.
Collapse
Affiliation(s)
- Duc Tran
- Department of Biochemistry Boston University School of Medicine Boston MA 02118USA
| | - Johann Bergholz
- Center of Growth, Metabolism and Aging Key Laboratory of Bio‐Resource and Eco‐Environment of Ministry of Education College of Life Sciences and State Key Laboratory of Biotherapy Sichuan University Chengdu 610014 China
| | - Haibo Zhang
- Center of Growth, Metabolism and Aging Key Laboratory of Bio‐Resource and Eco‐Environment of Ministry of Education College of Life Sciences and State Key Laboratory of Biotherapy Sichuan University Chengdu 610014 China
| | - Hanbing He
- Center of Growth, Metabolism and Aging Key Laboratory of Bio‐Resource and Eco‐Environment of Ministry of Education College of Life Sciences and State Key Laboratory of Biotherapy Sichuan University Chengdu 610014 China
| | - Yang Wang
- Center of Growth, Metabolism and Aging Key Laboratory of Bio‐Resource and Eco‐Environment of Ministry of Education College of Life Sciences and State Key Laboratory of Biotherapy Sichuan University Chengdu 610014 China
| | - Yujun Zhang
- Center of Growth, Metabolism and Aging Key Laboratory of Bio‐Resource and Eco‐Environment of Ministry of Education College of Life Sciences and State Key Laboratory of Biotherapy Sichuan University Chengdu 610014 China
| | - Qintong Li
- Center of Growth, Metabolism and Aging Key Laboratory of Bio‐Resource and Eco‐Environment of Ministry of Education College of Life Sciences and State Key Laboratory of Biotherapy Sichuan University Chengdu 610014 China
| | - James L. Kirkland
- Robert and Arlene Kogod Center on Aging Mayo Clinic College of Medicine Rochester MN 55905USA
| | - Zhi‐Xiong Xiao
- Center of Growth, Metabolism and Aging Key Laboratory of Bio‐Resource and Eco‐Environment of Ministry of Education College of Life Sciences and State Key Laboratory of Biotherapy Sichuan University Chengdu 610014 China
| |
Collapse
|
129
|
Bernard D, Vindrieux D. PLA2R1: expression and function in cancer. BIOCHIMICA ET BIOPHYSICA ACTA 2014; 1846:40-4. [PMID: 24667060 DOI: 10.1016/j.bbcan.2014.03.003] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2014] [Revised: 03/17/2014] [Accepted: 03/19/2014] [Indexed: 12/31/2022]
Abstract
The phospholipase A2 receptor 1 (PLA2R1 or PLA2R) was isolated twenty years ago for its ability to bind several secretory phospholipase A2 proteins (sPLA2). Since its identification, it has attracted only a limited interest, mainly in the sPLA2 biology field, as it is viewed uniquely as a regulator of sPLA2 activities. Recent discoveries outline novel important functions of this gene in cancer biology. Indeed, PLA2R1 gain or loss of function experiments in vitro and in vivo shows that this receptor promotes several tumor suppressive responses including senescence, apoptosis and inhibition of transformation. Supporting a tumor suppressive role of PLA2R1, its expression decreases in numerous cancers, and known oncogenes such as HIF2α and c-MYC repress its expression. PLA2R1 promoter methylation, a classical way to repress tumor suppressive gene expression in cancer cells, is observed in leukemia, in kidney and in breast cancer cells. Mechanistically, PLA2R1 activates the kinase JAK2 and orients its activity towards a tumor suppressive one. PLA2R1 also promotes accumulation of reactive oxygen species which induce cell death and senescence. This review compiles recent data demonstrating an unexpected tumor suppressive role of PLA2R1 and outlines the future work needed to improve our knowledge of the functions of this gene in cancer.
Collapse
Affiliation(s)
- David Bernard
- INSERM U1052, Centre de Recherche en Cancérologie de Lyon, Lyon F-69373, France; CNRS UMR 5286, Lyon F-69373, France; Centre Léon Bérard, Lyon F-69373, France; Université de Lyon, Lyon F-69373, France.
| | - David Vindrieux
- INSERM U1052, Centre de Recherche en Cancérologie de Lyon, Lyon F-69373, France; CNRS UMR 5286, Lyon F-69373, France; Centre Léon Bérard, Lyon F-69373, France; Université de Lyon, Lyon F-69373, France
| |
Collapse
|
130
|
Zinc finger protein 637 protects cells against oxidative stress-induced premature senescence by mTERT-mediated telomerase activity and telomere maintenance. Cell Death Dis 2014; 5:e1334. [PMID: 25032857 PMCID: PMC4123090 DOI: 10.1038/cddis.2014.298] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2014] [Revised: 06/04/2014] [Accepted: 06/05/2014] [Indexed: 02/05/2023]
Abstract
Oxidative stress is believed to be an important inducer of cellular senescence and aging. Zinc finger protein 637 (Zfp637), which belongs to the Krüppel-like protein family, has been hypothesized to play a role in oxidative stress. Nevertheless, the precise function of Zfp637 has seldom been reported, and it remains unclear whether Zfp637 is involved in oxidative stress-induced premature senescence. In this study, we show that the endogenous expression levels of Zfp637 and mouse telomerase reverse transcriptase (mTERT) are downregulated during oxidative stress-induced premature senescence and in senescent tissues from naturally aged mice. The overexpression of Zfp637 markedly increases mTERT expression and telomerase activity, maintains telomere length, and inhibits both H2O2 and D-galactose-induced senescence accompanied by a reduction in the production of reactive oxygen species (ROS). In contrast, the knockdown of Zfp637 significantly aggravates cellular senescence by downregulating mTERT and telomerase activity, accelerating telomere shortening, and increasing ROS accumulation. In addition, the protective effect of Zfp637 against premature senescence is abrogated in the absence of mTERT. We further confirm that Zfp637 binds to and transactivates the mTERT promoter (−535/−502) specifically. As a result, the mTERT-mediated telomerase activity and telomere maintenance are responsible for the protective effect of Zfp637 against oxidative stress-induced senescence. We therefore propose that Zfp637 prevents oxidative stress-induced premature senescence in an mTERT-dependent manner, and these results provide a new foundation for the investigation of cellular senescence and aging.
Collapse
|
131
|
New insights into the role of mitochondrial dynamics and autophagy during oxidative stress and aging in the heart. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2014; 2014:210934. [PMID: 25132912 PMCID: PMC4124219 DOI: 10.1155/2014/210934] [Citation(s) in RCA: 88] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/28/2014] [Revised: 06/05/2014] [Accepted: 06/18/2014] [Indexed: 12/26/2022]
Abstract
The heart is highly sensitive to the aging process. In the elderly, the heart tends to become hypertrophic and fibrotic. Stiffness increases with ensuing systolic and diastolic dysfunction. Aging also affects the cardiac response to stress. At the molecular level, the aging process is associated with accumulation of damaged proteins and organelles, partially due to defects in protein quality control systems. The accumulation of dysfunctional and abnormal mitochondria is an important pathophysiological feature of the aging process, which is associated with excessive production of reactive oxygen species. Mitochondrial fusion and fission and mitochondrial autophagy are crucial mechanisms for maintaining mitochondrial function and preserving energy production. In particular, mitochondrial fission allows for selective segregation of damaged mitochondria, which are afterward eliminated by autophagy. Unfortunately, recent evidence indicates that mitochondrial dynamics and autophagy are progressively impaired over time, contributing to the aging process. This suggests that restoration of these mechanisms could delay organ senescence and prevent age-associated cardiac diseases. Here, we discuss the current understanding of the close relationship between mitochondrial dynamics, mitophagy, oxidative stress, and aging, with a particular focus on the heart.
Collapse
|
132
|
Loseva O, Shubbar E, Haghdoost S, Evers B, Helleday T, Harms-Ringdahl M. Chronic Low Dose Rate Ionizing Radiation Exposure Induces Premature Senescence in Human Fibroblasts that Correlates with Up Regulation of Proteins Involved in Protection against Oxidative Stress. Proteomes 2014; 2:341-362. [PMID: 28250385 PMCID: PMC5302754 DOI: 10.3390/proteomes2030341] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2014] [Revised: 06/16/2014] [Accepted: 06/25/2014] [Indexed: 12/16/2022] Open
Abstract
The risks of non-cancerous diseases associated with exposure to low doses of radiation are at present not validated by epidemiological data, and pose a great challenge to the scientific community of radiation protection research. Here, we show that premature senescence is induced in human fibroblasts when exposed to chronic low dose rate (LDR) exposure (5 or 15 mGy/h) of gamma rays from a 137Cs source. Using a proteomic approach we determined differentially expressed proteins in cells after chronic LDR radiation compared to control cells. We identified numerous proteins involved in protection against oxidative stress, suggesting that these pathways protect against premature senescence. In order to further study the role of oxidative stress for radiation induced premature senescence, we also used human fibroblasts, isolated from a patient with a congenital deficiency in glutathione synthetase (GS). We found that these GS deficient cells entered premature senescence after a significantly shorter time of chronic LDR exposure as compared to the GS proficient cells. In conclusion, we show that chronic LDR exposure induces premature senescence in human fibroblasts, and propose that a stress induced increase in reactive oxygen species (ROS) is mechanistically involved.
Collapse
Affiliation(s)
- Olga Loseva
- Division of Translational Medicine and Chemical Biology, Science for Life Laboratory, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm S-171 21, Sweden.
| | - Emman Shubbar
- Sahlgrenska Cancer Center, Department of Clinical Genetics, Institute of Biomedicine, Sahlgrenska Academy at University of Gothenburg, Gothenburg SE-41345, Sweden.
| | - Siamak Haghdoost
- Center for Radiation Protections Research, Department of Molecular Biosciences, The Wenner Gren Institute, Stockholm University, Stockholm S-106 91, Sweden.
| | - Bastiaan Evers
- Division of Molecular Carcinogenesis, The Netherlands Cancer Institute, Amsterdam 1066 CX, Netherlands.
| | - Thomas Helleday
- Division of Translational Medicine and Chemical Biology, Science for Life Laboratory, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm S-171 21, Sweden.
| | - Mats Harms-Ringdahl
- Center for Radiation Protections Research, Department of Molecular Biosciences, The Wenner Gren Institute, Stockholm University, Stockholm S-106 91, Sweden.
| |
Collapse
|
133
|
Mugoni V, Camporeale A, Santoro MM. Analysis of oxidative stress in zebrafish embryos. J Vis Exp 2014. [PMID: 25046434 DOI: 10.3791/51328] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
High levels of reactive oxygen species (ROS) may cause a change of cellular redox state towards oxidative stress condition. This situation causes oxidation of molecules (lipid, DNA, protein) and leads to cell death. Oxidative stress also impacts the progression of several pathological conditions such as diabetes, retinopathies, neurodegeneration, and cancer. Thus, it is important to define tools to investigate oxidative stress conditions not only at the level of single cells but also in the context of whole organisms. Here, we consider the zebrafish embryo as a useful in vivo system to perform such studies and present a protocol to measure in vivo oxidative stress. Taking advantage of fluorescent ROS probes and zebrafish transgenic fluorescent lines, we develop two different methods to measure oxidative stress in vivo: i) a "whole embryo ROS-detection method" for qualitative measurement of oxidative stress and ii) a "single-cell ROS detection method" for quantitative measurements of oxidative stress. Herein, we demonstrate the efficacy of these procedures by increasing oxidative stress in tissues by oxidant agents and physiological or genetic methods. This protocol is amenable for forward genetic screens and it will help address cause-effect relationships of ROS in animal models of oxidative stress-related pathologies such as neurological disorders and cancer.
Collapse
Affiliation(s)
- Vera Mugoni
- Department of Molecular Biotechnology and Health Science, University of Torino
| | - Annalisa Camporeale
- Department of Molecular Biotechnology and Health Science, University of Torino
| | - Massimo M Santoro
- Department of Molecular Biotechnology and Health Science, University of Torino; Laboratory of Endothelial Molecular Biology, Vesalius Research Center, VIB;
| |
Collapse
|
134
|
Cho J, Yusuf R, Kook S, Attar E, Lee D, Park B, Cheng T, Scadden DT, Lee BC. Purinergic P2Y₁₄ receptor modulates stress-induced hematopoietic stem/progenitor cell senescence. J Clin Invest 2014; 124:3159-71. [PMID: 24937426 DOI: 10.1172/jci61636] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2014] [Accepted: 04/29/2014] [Indexed: 11/17/2022] Open
Abstract
Purinergic receptors of the P2Y family are G protein-coupled surface receptors that respond to extracellular nucleotides and can mediate responses to local cell damage. P2Y-dependent signaling contributes to thrombotic and/or inflammatory consequences of tissue injury by altering platelet and endothelial activation and immune cell phagocytosis. Here, we have demonstrated that P2Y14 modifies cell senescence and cell death in response to tissue stress, thereby enabling preservation of hematopoietic stem/progenitor cell function. In mice, P2Y14 deficiency had no demonstrable effect under homeostatic conditions; however, radiation stress, aging, sequential exposure to chemotherapy, and serial bone marrow transplantation increased senescence in animals lacking P2Y14. Enhanced senescence coincided with increased ROS, elevated p16(INK4a) expression, and hypophosphorylated Rb and was inhibited by treatment with a ROS scavenger or inhibition of p38/MAPK and JNK. Treatment of WT cells with pertussis toxin recapitulated the P2Y14 phenotype, suggesting that P2Y14 mediates antisenescence effects through Gi/o protein-dependent pathways. Primitive hematopoietic cells lacking P2Y14 were compromised in their ability to restore hematopoiesis in irradiated mice. Together, these data indicate that P2Y14 on stem/progenitor cells of the hematopoietic system inhibits cell senescence by monitoring and responding to the extracellular manifestations of tissue stress and suggest that P2Y14-mediated responses prevent the premature decline of regenerative capacity after injury.
Collapse
|
135
|
Soriani A, Iannitto ML, Ricci B, Fionda C, Malgarini G, Morrone S, Peruzzi G, Ricciardi MR, Petrucci MT, Cippitelli M, Santoni A. Reactive oxygen species- and DNA damage response-dependent NK cell activating ligand upregulation occurs at transcriptional levels and requires the transcriptional factor E2F1. THE JOURNAL OF IMMUNOLOGY 2014; 193:950-60. [PMID: 24913980 DOI: 10.4049/jimmunol.1400271] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Increasing evidence indicates that cancer cell stress induced by chemotherapeutic agents promote antitumor immune responses and contribute to their full clinical efficacy. In this article, we identify the signaling events underlying chemotherapy-induced NKG2D and DNAM-1 ligand expression on multiple myeloma (MM) cells. Our findings indicate that sublethal doses of doxorubicin and melphalan initiate a DNA damage response (DDR) controlling ligand upregulation on MM cell lines and patient-derived malignant plasma cells in Chk1/2-dependent and p53-independent manner. Drug-induced MICA and PVR gene expression are transcriptionally regulated and involve DDR-dependent E2F1 transcription factor activity. We also describe the involvement of changes in the redox state in the control of DDR-dependent upregulation of ligand surface expression and gene transcriptional activity by using the antioxidant agent N-acetyl-L-cysteine. Finally, in accordance with much evidence indicating that DDR and oxidative stress are major determinants of cellular senescence, we found that redox-dependent DDR activation upon chemotherapeutic treatment is critical for MM cell entry in premature senescence and is required for the preferential ligand upregulation on senescent cells, which are preferentially killed by NK cells and trigger potent IFN-γ production. We propose immunogenic senescence as a mechanism that promotes the clearance of drug-treated tumor cells by innate effector lymphocytes, including NK cells.
Collapse
Affiliation(s)
- Alessandra Soriani
- Department of Molecular Medicine, Pasteur Institute-Cenci Bolognetti Foundation, Sapienza University of Rome, 00161 Rome, Italy;
| | - Maria Luisa Iannitto
- Department of Molecular Medicine, Pasteur Institute-Cenci Bolognetti Foundation, Sapienza University of Rome, 00161 Rome, Italy
| | - Biancamaria Ricci
- Department of Molecular Medicine, Pasteur Institute-Cenci Bolognetti Foundation, Sapienza University of Rome, 00161 Rome, Italy
| | - Cinzia Fionda
- Department of Molecular Medicine, Pasteur Institute-Cenci Bolognetti Foundation, Sapienza University of Rome, 00161 Rome, Italy
| | - Giulia Malgarini
- Department of Molecular Medicine, Pasteur Institute-Cenci Bolognetti Foundation, Sapienza University of Rome, 00161 Rome, Italy
| | - Stefania Morrone
- Department of Experimental Medicine, Sapienza University of Rome, 00161 Rome, Italy
| | - Giovanna Peruzzi
- Center for Life Nano Science-Italian Institute of Technology Sapienza, 00161 Rome, Italy; and
| | - Maria Rosaria Ricciardi
- Division of Hematology, Department of Cellular Biotechnologies and Hematology, Sapienza University of Rome, 00161 Rome, Italy
| | - Maria Teresa Petrucci
- Division of Hematology, Department of Cellular Biotechnologies and Hematology, Sapienza University of Rome, 00161 Rome, Italy
| | - Marco Cippitelli
- Department of Molecular Medicine, Pasteur Institute-Cenci Bolognetti Foundation, Sapienza University of Rome, 00161 Rome, Italy
| | - Angela Santoni
- Department of Molecular Medicine, Pasteur Institute-Cenci Bolognetti Foundation, Sapienza University of Rome, 00161 Rome, Italy;
| |
Collapse
|
136
|
Deschênes-Simard X, Lessard F, Gaumont-Leclerc MF, Bardeesy N, Ferbeyre G. Cellular senescence and protein degradation: breaking down cancer. Cell Cycle 2014; 13:1840-58. [PMID: 24866342 DOI: 10.4161/cc.29335] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Autophagy and the ubiquitin-proteasome pathway (UPP) are the major protein degradation systems in eukaryotic cells. Whereas the former mediate a bulk nonspecific degradation, the UPP allows a rapid degradation of specific proteins. Both systems have been shown to play a role in tumorigenesis, and the interest in developing therapeutic agents inhibiting protein degradation is steadily growing. However, emerging data point to a critical role for autophagy in cellular senescence, an established tumor suppressor mechanism. Recently, a selective protein degradation process mediated by the UPP was also shown to contribute to the senescence phenotype. This process is tightly regulated by E3 ubiquitin ligases, deubiquitinases, and several post-translational modifications of target proteins. Illustrating the complexity of UPP, more than 600 human genes have been shown to encode E3 ubiquitin ligases, a number which exceeds that of the protein kinases. Nevertheless, our knowledge of proteasome-dependent protein degradation as a regulated process in cellular contexts such as cancer and senescence remains very limited. Here we discuss the implications of protein degradation in senescence and attempt to relate this function to the protein degradation pattern observed in cancer cells.
Collapse
Affiliation(s)
- Xavier Deschênes-Simard
- Department of Biochemistry and Molecular Medicine; Université de Montréal; Montréal, Québec, Canada
| | - Frédéric Lessard
- Department of Biochemistry and Molecular Medicine; Université de Montréal; Montréal, Québec, Canada
| | | | - Nabeel Bardeesy
- Massachusetts General Hospital Cancer Center; Harvard Medical School; Boston, MA USA
| | - Gerardo Ferbeyre
- Department of Biochemistry and Molecular Medicine; Université de Montréal; Montréal, Québec, Canada
| |
Collapse
|
137
|
Rodríguez-Sastre MA, Rojas E, Valverde M. Assessing the impact of As–Cd–Pb metal mixture on cell transformation by two-stage Balb/c 3T3 cell assay. Mutagenesis 2014; 29:251-7. [DOI: 10.1093/mutage/geu013] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
138
|
Katsube T, Mori M, Tsuji H, Shiomi T, Wang B, Liu Q, Nenoi M, Onoda M. Most hydrogen peroxide-induced histone H2AX phosphorylation is mediated by ATR and is not dependent on DNA double-strand breaks. J Biochem 2014; 156:85-95. [DOI: 10.1093/jb/mvu021] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
|
139
|
Dassati S, Waldner A, Schweigreiter R. Apolipoprotein D takes center stage in the stress response of the aging and degenerative brain. Neurobiol Aging 2014; 35:1632-42. [PMID: 24612673 PMCID: PMC3988949 DOI: 10.1016/j.neurobiolaging.2014.01.148] [Citation(s) in RCA: 102] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2013] [Revised: 01/17/2014] [Accepted: 01/30/2014] [Indexed: 02/08/2023]
Abstract
Apolipoprotein D (ApoD) is an ancient member of the lipocalin family with a high degree of sequence conservation from insects to mammals. It is not structurally related to other major apolipoproteins and has been known as a small, soluble carrier protein of lipophilic molecules that is mostly expressed in neurons and glial cells within the central and peripheral nervous system. Recent data indicate that ApoD not only supplies cells with lipophilic molecules, but also controls the fate of these ligands by modulating their stability and oxidation status. Of particular interest is the binding of ApoD to arachidonic acid and its derivatives, which play a central role in healthy brain function. ApoD has been shown to act as a catalyst in the reduction of peroxidized eicosanoids and to attenuate lipid peroxidation in the brain. Manipulating its expression level in fruit flies and mice has demonstrated that ApoD has a favorable effect on both stress resistance and life span. The APOD gene is the gene that is upregulated the most in the aging human brain. Furthermore, ApoD levels in the nervous system are elevated in a large number of neurologic disorders including Alzheimer's disease, schizophrenia, and stroke. There is increasing evidence for a prominent neuroprotective role of ApoD because of its antioxidant and anti-inflammatory activity. ApoD emerges as an evolutionarily conserved anti-stress protein that is induced by oxidative stress and inflammation and may prove to be an effective therapeutic agent against a variety of neuropathologies, and even against aging.
Collapse
Affiliation(s)
- Sarah Dassati
- Department of Neurological Rehabilitation, Private Hospital "Villa Melitta", Bolzano, Italy
| | - Andreas Waldner
- Department of Neurological Rehabilitation, Private Hospital "Villa Melitta", Bolzano, Italy
| | - Rüdiger Schweigreiter
- Division of Neurobiochemistry, Biocenter, Innsbruck Medical University, Innsbruck, Austria.
| |
Collapse
|
140
|
Correia-Melo C, Hewitt G, Passos JF. Telomeres, oxidative stress and inflammatory factors: partners in cellular senescence? LONGEVITY & HEALTHSPAN 2014; 3:1. [PMID: 24472138 PMCID: PMC3922784 DOI: 10.1186/2046-2395-3-1] [Citation(s) in RCA: 127] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/16/2013] [Accepted: 12/02/2013] [Indexed: 12/31/2022]
Abstract
Senescence, the state of irreversible cell-cycle arrest, plays paradoxical albeit important roles in vivo: it protects organisms against cancer but also contributes to age-related loss of tissue function. The DNA damage response (DDR) has a central role in cellular senescence. Not only does it contribute to the irreversible loss of replicative capacity but also to the production and secretion of reactive oxygen species (ROS), and bioactive peptides collectively known as the senescence-associated secretory phenotype (SASP). Both ROS and the SASP have been shown to impact on senescence in an autocrine as well as paracrine fashion; however, the underlying mechanisms are not well understood. In this review we describe our current understanding of cellular senescence, examine in detail the intricate pathways linking the DDR, ROS and SASP, and evaluate their impact on the stability of the senescent phenotype.
Collapse
Affiliation(s)
| | | | - João F Passos
- Ageing Research Laboratories, Centre for Integrated Systems Biology of Ageing and Nutrition, Institute for Ageing and Health, Campus for Ageing and Vitality, Newcastle University, Newcastle upon Tyne NE4 5PL, UK.
| |
Collapse
|
141
|
Abstract
Cellular senescence is a stress response that accompanies stable exit from the cell cycle. Classically, senescence, particularly in human cells, involves the p53 and p16/Rb pathways, and often both of these tumor suppressor pathways need to be abrogated to bypass senescence. In parallel, a number of effector mechanisms of senescence have been identified and characterized. These studies suggest that senescence is a collective phenotype of these multiple effectors, and their intensity and combination can be different depending on triggers and cell types, conferring a complex and diverse nature to senescence. Series of studies on senescence-associated secretory phenotype (SASP) in particular have revealed various layers of functionality of senescent cells in vivo. Here we discuss some key features of senescence effectors and attempt to functionally link them when it is possible.
Collapse
Affiliation(s)
- Rafik Salama
- Cancer Research UK Cambridge Institute, University of Cambridge, Cambridge CB2 0RE, United Kingdom
| | - Mahito Sadaie
- Department of Gene Mechanisms, Graduate School of Biostudies, Kyoto University, Yoshida-Konoe-cho, Sakyo-ku, Kyoto 606-8501, Japan
| | - Matthew Hoare
- Cancer Research UK Cambridge Institute, University of Cambridge, Cambridge CB2 0RE, United Kingdom
| | - Masashi Narita
- Cancer Research UK Cambridge Institute, University of Cambridge, Cambridge CB2 0RE, United Kingdom
| |
Collapse
|
142
|
Redox proteomics and the dynamic molecular landscape of the aging brain. Ageing Res Rev 2014; 13:75-89. [PMID: 24374232 DOI: 10.1016/j.arr.2013.12.005] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2013] [Revised: 12/04/2013] [Accepted: 12/16/2013] [Indexed: 12/13/2022]
Abstract
It is well established that the risk to develop neurodegenerative disorders increases with chronological aging. Accumulating studies contributed to characterize the age-dependent changes either at gene and protein expression level which, taken together, show that aging of the human brain results from the combination of the normal decline of multiple biological functions with environmental factors that contribute to defining disease risk of late-life brain disorders. Finding the "way out" of the labyrinth of such complex molecular interactions may help to fill the gap between "normal" brain aging and development of age-dependent diseases. To this purpose, proteomics studies are a powerful tool to better understand where to set the boundary line of healthy aging and age-related disease by analyzing the variation of protein expression levels and the major post translational modifications that determine "protein" physio/pathological fate. Increasing attention has been focused on oxidative modifications due to the crucial role of oxidative stress in aging, in addition to the fact that this type of modification is irreversible and may alter protein function. Redox proteomics studies contributed to decipher the complexity of brain aging by identifying the proteins that were increasingly oxidized and eventually dysfunctional as a function of age. The purpose of this review is to summarize the most important findings obtained by applying proteomics approaches to murine models of aging with also a brief overview of some human studies, in particular those related to dementia.
Collapse
|
143
|
Gupta A, Wani A, Joshi A, Ahsan H, Ahmad R. Characterization of human serum immunoglobulin g modified with singlet oxygen. Indian J Clin Biochem 2014; 29:63-8. [PMID: 24478551 PMCID: PMC3903939 DOI: 10.1007/s12291-013-0333-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2013] [Accepted: 04/20/2013] [Indexed: 11/29/2022]
Abstract
Reactive oxygen species, as singlet oxygen ((1)O2), is continuously being generated by aerobic organisms, and react actively with biomolecules. At excessive amounts, (1)O2 induces oxidative stress and shows carcinogenic and toxic effects due to oxidation of lipids, proteins and nucleic acids. In our study, immunoglobulin G (IgG) was modified by (1)O2 generated by the ultraviolet (UV) irradiation of methylene blue. The modified IgG was characterized by UV spectroscopy, carbonyl content determination, thermal denaturation and electrophoretic study. Oxidation induced by modification of IgG by (1)O2 also analyzed by scavenging studies. It was found that ultraviolet absorption spectra of modified IgG shows marked hyperchromicity. The carbonyl content was found to be high in modified IgG as compared to native IgG which confirms its oxidation. Thermal denaturation of modified protein sample shows decrease in Tm value by 3 °C and less intensity banding pattern on polyacrylamide gel electrophoresis. The quenching effect of sodium azide provides clue for modification of IgG by methylene blue, as it is known (1)O2 scavenger. Hence, the IgG modified with (1)O2 may be one of the etiological pathogenic factors for rheumatoid arthritis and diabetes.
Collapse
Affiliation(s)
- Aniket Gupta
- />Department of Biochemistry, SBS Post Graduate Institute of Biomedical Sciences, Dehradun, India
| | - Aadil Wani
- />Department of Biochemistry, SBS Post Graduate Institute of Biomedical Sciences, Dehradun, India
| | - Anamika Joshi
- />Department of Biochemistry, SBS Post Graduate Institute of Biomedical Sciences, Dehradun, India
| | - Haseeb Ahsan
- />Department of Biochemistry, Faculty of Dentistry, Jamia Millia Islamia, New Delhi, India
| | - Rizwan Ahmad
- />Department of Biochemistry, SBS Post Graduate Institute of Biomedical Sciences, Dehradun, India
- />Department of Biochemistry, Oman Medical College, Sohar, Oman
| |
Collapse
|
144
|
Rajesh K, Papadakis AI, Kazimierczak U, Peidis P, Wang S, Ferbeyre G, Kaufman RJ, Koromilas AE. eIF2α phosphorylation bypasses premature senescence caused by oxidative stress and pro-oxidant antitumor therapies. Aging (Albany NY) 2013; 5:884-901. [PMID: 24334569 PMCID: PMC3883705 DOI: 10.18632/aging.100620] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/30/2023]
Abstract
Eukaryotic cells respond to various forms of stress by blocking mRNA translation initiation via the phosphorylation of the alpha (α) subunit of eIF2 at serine 51 (S51) (eIFαP). An important role of eIF2αP is the regulation of redox homeostasis and adaptation of cells to oxidative stress. Herein, we demonstrate that eIF2αP guards cells from intracellular reactive oxygen species (ROS) via the inhibition of senescence. Specifically, genetic inactivation of either eIF2αP or eIF2α kinase PERK in primary mouse or human fibroblasts leads to proliferative defects associated with increased DNA damage, G2/M accumulation and induction of premature senescence. Impaired proliferation of either PERK or eIF2αP-deficient primary cells is caused by increased ROS and restored by anti-oxidant treatment. Contrary to primary cells, impaired eIF2αP in immortalized mouse fibroblasts or human tumor cells provides tolerance to elevated intracellular ROS levels. However, eIF2αP-deficient human tumor cells are highly susceptible to extrinsic ROS generated by the pro-oxidant drug doxorubicin by undergoing premature senescence. Our work demonstrates that eIF2αP determines cell destiny through its capacity to control senescence in response to oxidative stress. Also, inhibition of eIF2αP may be a suitable means to increase the anti-tumor effects of pro-oxidant drugs through the induction of senescence.
Collapse
Affiliation(s)
- Kamindla Rajesh
- Lady Davis Institute for Medical Research, McGill University, Sir Mortimer B. Davis-Jewish General Hospital, Montreal, Quebec H3T 1E2, Canada
| | - Andreas I. Papadakis
- Lady Davis Institute for Medical Research, McGill University, Sir Mortimer B. Davis-Jewish General Hospital, Montreal, Quebec H3T 1E2, Canada
| | - Urszula Kazimierczak
- Lady Davis Institute for Medical Research, McGill University, Sir Mortimer B. Davis-Jewish General Hospital, Montreal, Quebec H3T 1E2, Canada
- Department of Cancer Immunology, Chair of Medical Biotechnology, Poznan University of Medical Sciences, Poland
| | - Philippos Peidis
- Lady Davis Institute for Medical Research, McGill University, Sir Mortimer B. Davis-Jewish General Hospital, Montreal, Quebec H3T 1E2, Canada
| | - Shuo Wang
- Lady Davis Institute for Medical Research, McGill University, Sir Mortimer B. Davis-Jewish General Hospital, Montreal, Quebec H3T 1E2, Canada
| | - Gerardo Ferbeyre
- Département de Biochimie, Université de Montréal; Montréal, Québec H3C 3J7, Canada
| | - Randal J. Kaufman
- Center for Neuroscience, Aging and Stem Cell Research, Sanford Burnham Medical Research Institute, La Jolla, CA 92037, USA
| | - Antonis E. Koromilas
- Lady Davis Institute for Medical Research, McGill University, Sir Mortimer B. Davis-Jewish General Hospital, Montreal, Quebec H3T 1E2, Canada
- Department of Oncology, Faculty of Medicine, McGill University, Montreal, Quebec H2W 1S6, Canada
| |
Collapse
|
145
|
Choi SH, Jung SY, Yoo SY, Yoo SM, Kim DY, Kang S, Baek SH, Kwon SM. Regulation of ROS-independent ERK signaling rescues replicative cellular senescence in ex vivo expanded human c-kit-positive cardiac progenitor cells. Int J Cardiol 2013; 169:73-82. [DOI: 10.1016/j.ijcard.2013.08.076] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/22/2012] [Revised: 06/14/2013] [Accepted: 08/28/2013] [Indexed: 11/16/2022]
|
146
|
Citrin DE, Shankavaram U, Horton JA, Shield W, Zhao S, Asano H, White A, Sowers A, Thetford A, Chung EJ. Role of type II pneumocyte senescence in radiation-induced lung fibrosis. J Natl Cancer Inst 2013; 105:1474-84. [PMID: 24052614 DOI: 10.1093/jnci/djt212] [Citation(s) in RCA: 128] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
BACKGROUND Radiation is a commonly delivered therapeutic modality for cancer. The causes underlying the chronic, progressive nature of radiation injury in the lung are poorly understood. METHODS C57Bl/6NCr mice were exposed to thoracic irradiation (n = 3 per dose and time point for tissue collection). Microarray analysis of gene expression from irradiated murine lung was performed using one-way analysis of variance with post hoc Scheffe analysis. Senescence and type II airway epithelial cell (AECII) count were assayed in irradiated murine lung tissue (n = 3 per condition). Irradiated mice were treated with diphenyleneiodonium (DPI), an inhibitor of NADPH oxidase (NOX), and fibrosis was assessed by collagen assays. All statistical tests were two-tailed. RESULTS Gene expression in lung tissue from mice irradiated to 17.5 Gy clustered with that of aged unirradiated mice. Only fibrogenic exposures led to AECII senescence (0 Gy: 0.66% ± 0.67%; 5 Gy: 4.5% ± 1.19%; 17.5 Gy: 18.7% ± 3.05; P = .007) and depletion (0 Gy: 2.89 per alveolus ± 0.26; 5 Gy: 2.41 ± 0.19; 17.5 Gy: 1.6 ± 0.14; P < .001) at 30 weeks. Treatment of irradiated mice with DPI for 16 weeks markedly reduced collagen accumulation (5×6 Gy: 57.26 μg/lung ± 9.91; 5×6 Gy ± DPI: 36.54μg/lung ± 4.39; P = .03) and AECII senescence (5×6 Gy: 37.61% ± 4.82%; 5×6 Gy ± DPI: 12.38% ± 2.78; P < .001). CONCLUSIONS These studies identify senescence as an important process in AECII in vivo and indicate that NOX is a critical mediator of radiation-induced AECII senescence and pulmonary fibrosis.
Collapse
Affiliation(s)
- Deborah E Citrin
- Affiliations of authors: Radiation Oncology Branch (DEC, US, JAH, WS, SZ, HA, AY, EJC) and Radiation Biology Branch (AS, AT), Center for Cancer Research, National Institutes of Health, Bethesda, MD
| | | | | | | | | | | | | | | | | | | |
Collapse
|
147
|
Contribution of S6K1/MAPK signaling pathways in the response to oxidative stress: activation of RSK and MSK by hydrogen peroxide. PLoS One 2013; 8:e75523. [PMID: 24058693 PMCID: PMC3776792 DOI: 10.1371/journal.pone.0075523] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2013] [Accepted: 08/14/2013] [Indexed: 11/19/2022] Open
Abstract
Cells respond to different kind of stress through the coordinated activation of signaling pathways such as MAPK or p53. To find which molecular mechanisms are involved, we need to understand their cell adaptation. The ribosomal protein, S6 kinase 1 (S6K1), is a common downstream target of signaling by hormonal or nutritional stress. Here, we investigated the initial contribution of S6K1/MAPK signaling pathways in the cell response to oxidative stress produced by hydrogen peroxide (H2O2). To analyze S6K1 activation, we used the commercial anti-phospho-Thr389-S6K1 antibody most frequently mentioned in the bibliography. We found that this antibody detected an 80-90 kDa protein that was rapidly phosphorylated in response to H2O2 in several human cells. Unexpectedly, this phosphorylation was insensitive to both mTOR and PI3K inhibitors, and knock-down experiments showed that this protein was not S6K1. RSK and MSK proteins were candidate targets of this phosphorylation. We demonstrated that H2O2 stimulated phosphorylation of RSK and MSK kinases at residues that are homologous to Thr389 in S6K1. This phosphorylation required the activity of either p38 or ERK MAP kinases. Kinase assays showed activation of RSK and MSK by H2O2. Experiments with mouse embryonic fibroblasts from p38 animals’ knockout confirmed these observations. Altogether, these findings show that the S6K1 signaling pathway is not activated under these conditions, clarify previous observations probably misinterpreted by non-specific detection of proteins RSK and MSK by the anti-phospho-Thr389-S6K1 antibody, and demonstrate the specific activation of MAPK signaling pathways through ERK/p38/RSK/MSK by H2O2.
Collapse
|
148
|
Current overview of functions of FoxO proteins, with special regards to cellular homeostasis, cell response to stress, as well as inflammation and aging. Adv Med Sci 2013. [PMID: 23183765 DOI: 10.2478/v10039-012-0039-1] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
FoxO transcription factors act at the interconnections between metabolic pathways inducible by many important signal transducers and mediators, such as p53, Ikk-β, NFKB, Akt, sirtuins, PTEN, and others. This may account for a crucial significance of disruptions in FoxO functions both in many kinds of diseases (including cancer, chronic inflammatory diseases, degenerative diseases, obesity, polymetabolic syndrome) and in some disease-like conditions (such as inflammaging, cachexia related to chronic inflammation, cancer-promotion by some chronic inflammatory responses, and the aging process itself). This paper reviews complex interactions between FoxOs and other signal transducers, trying to pinpoint how exactly disruptions of FoxO functions may occur, and how they may contribute to occurrence, development or complications of the conditions mentioned above.
Collapse
|
149
|
Repeated exposure of mouse dermal fibroblasts at a sub-cytotoxic dose of UVB leads to premature senescence: a robust model of cellular photoaging. J Dermatol Sci 2013; 73:49-56. [PMID: 24054498 DOI: 10.1016/j.jdermsci.2013.08.013] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2013] [Revised: 08/20/2013] [Accepted: 08/26/2013] [Indexed: 01/14/2023]
Abstract
BACKGROUND Photoaging skin is due to accumulative effect of UV irradiation that mainly imposes its damage on dermal fibroblasts. To mimic the specific cellular responses invoked by long term effect of UVB, it is preferable to develop a photo-damaged model in vitro based on repeated UVB exposure instead of a single exposure. OBJECTIVE To develop a photo-damaged model of fibroblasts by repeated UVB exposure allowing for investigation of molecular mechanism underlying premature senescence and testing of potential anti-photoaging compounds. METHODS Mouse dermal fibroblasts (MDFs) at early passages (passages 1-3) were exposed to a series of 4 sub-cytotoxic dose of UVB. The senescent phenotypes were detected at 24 or 48h after the last irradiation including cell viability, ROS generation, mitochondrial membrane potential, cell cycle, production and degradation of extracellular matrix. RESULTS Repeated exposure of UVB resulted in remarkable features of senescence. It effectively avoided the disadvantages of single dose such as induction of cell death rather than senescence, inadequate stress resulting in cellular self-rehabilitation. CONCLUSION Our work confirms the possibility of detecting cellular machinery that mediates UVB damage to fibroblasts in vitro by repeated exposure, while the potential molecular mechanisms including cell surface receptors, protein kinase signal transduction pathways, and transcription factors remain to be further evaluated.
Collapse
|
150
|
Combined treatment with low concentrations of decitabine and SAHA causes cell death in leukemic cell lines but not in normal peripheral blood lymphocytes. BIOMED RESEARCH INTERNATIONAL 2013; 2013:659254. [PMID: 24000324 PMCID: PMC3755446 DOI: 10.1155/2013/659254] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/11/2013] [Revised: 06/28/2013] [Accepted: 07/13/2013] [Indexed: 12/15/2022]
Abstract
Epigenetic therapy reverting aberrant acetylation or methylation offers the possibility to target preferentially tumor cells and to preserve normal cells. Combination epigenetic therapy may further improve the effect of individual drugs. We investigated combined action of demethylating agent decitabine and histone deacetylase inhibitor SAHA (Vorinostat) on different leukemic cell lines in comparison with peripheral blood lymphocytes. Large decrease of viability, as well as huge p21WAF1 induction, reactive oxygen species formation, and apoptotic features due to combined decitabine and SAHA action were detected in leukemic cell lines irrespective of their p53 status, while essentially no effect was observed in response to the combined drug action in normal peripheral blood lymphocytes of healthy donors. p53-dependent apoptotic pathway was demonstrated to participate in the wtp53 CML-T1 leukemic cell line response, while significant influence of reactive oxygen species on viability decrease has been detected in p53-null HL-60 cell line.
Collapse
|