151
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Dong P, Ihira K, Hamada J, Watari H, Yamada T, Hosaka M, Hanley SJ, Kudo M, Sakuragi N. Reactivating p53 functions by suppressing its novel inhibitor iASPP: a potential therapeutic opportunity in p53 wild-type tumors. Oncotarget 2015; 6:19968-75. [PMID: 26343523 PMCID: PMC4652980 DOI: 10.18632/oncotarget.4847] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2015] [Accepted: 06/28/2015] [Indexed: 12/22/2022] Open
Abstract
Although mutational inactivation of p53 is found in 50% of all human tumors, a subset of tumors display defective p53 function, but retain wild-type (WT) p53. Here, direct and indirect mechanisms leading to the loss of WT p53 activities are discussed. We summarize the oncogenic roles of iASPP, an inhibitor of WT p53, in promoting proliferation, invasion, drug or radiation-resistance and metastasis. From the therapeutic view, we highlight promising perspectives of microRNA-124, peptide and small molecules that reduce or block iASPP for the treatment of cancer. High iASPP expression enhances proliferation, aggressive behavior, the resistance to radiation/chemotherapy and correlates with poor prognosis in a range of human tumors. Overexpression of iASPP accelerates tumorigenesis and invasion through p53-dependent and p53-independent mechanisms. MicroRNA-124 directly targets iASPP and represses the growth and invasiveness of cancer cells. The disruption of iASPP-p53 interaction by a p53-derived peptide A34 restores p53 function in cancer cells. The inhibition of iASPP phosphorylation with small molecules induces p53-dependent apoptosis and growth suppression. The mechanisms underlying aberrant expression of iASPP in human tumors should be further investigated. Reactivating WT p53 functions by targeting its novel inhibitor iASPP holds promise for potential therapeutic interventions in the treatment of WT p53-containing tumors.
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Affiliation(s)
- Peixin Dong
- Department of Women's Health Educational System, Hokkaido University School of Medicine, Hokkaido University, Sapporo, Japan
| | - Kei Ihira
- Department of Gynecology, Hokkaido University School of Medicine, Hokkaido University, Sapporo, Japan
| | - Junichi Hamada
- Department of Stem Cell Biology, Hokkaido University Graduate School of Medicine, Kita-Ku, Sapporo, Japan
| | - Hidemichi Watari
- Department of Gynecology, Hokkaido University School of Medicine, Hokkaido University, Sapporo, Japan
| | - Takahiro Yamada
- Department of Women's Health Educational System, Hokkaido University School of Medicine, Hokkaido University, Sapporo, Japan
| | - Masayoshi Hosaka
- Department of Gynecology, Hokkaido University School of Medicine, Hokkaido University, Sapporo, Japan
| | - Sharon J.B. Hanley
- Department of Women's Health Educational System, Hokkaido University School of Medicine, Hokkaido University, Sapporo, Japan
| | - Masataka Kudo
- Department of Gynecology, Hokkaido University School of Medicine, Hokkaido University, Sapporo, Japan
| | - Noriaki Sakuragi
- Department of Women's Health Educational System, Hokkaido University School of Medicine, Hokkaido University, Sapporo, Japan
- Department of Gynecology, Hokkaido University School of Medicine, Hokkaido University, Sapporo, Japan
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152
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Reinardy HC, Bodnar AG. Profiling DNA damage and repair capacity in sea urchin larvae and coelomocytes exposed to genotoxicants. Mutagenesis 2015; 30:829-39. [PMID: 26175033 DOI: 10.1093/mutage/gev052] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The ability to protect the genome from harmful DNA damage is critical for maintaining genome stability and protecting against disease, including cancer. Many echinoderms, including sea urchins, are noted for the lack of neoplastic disease, but there are few studies investigating susceptibility to DNA damage and capacity for DNA repair in these animals. In this study, DNA damage was induced in adult sea urchin coelomocytes and larvae by exposure to a variety of genotoxicants [UV-C (0-3000 J/m(2)), hydrogen peroxide (0-10mM), bleomycin (0-300 µM) and methylmethanesulfonate (MMS, 0-30 mM)] and the capacity for repair was measured over a 24-h period of recovery. Larvae were more sensitive than coelomocytes, with higher levels of initial DNA damage (fast micromethod) for all genotoxicants except MMS and increased levels of mortality 24h following treatment for all genotoxicants. The larvae that survived were able to efficiently repair damage within 24-h recovery. The ability to repair DNA damage differed depending on treatments, but both larvae and coelomocytes were able to most efficiently repair H2O2-induced damage. Time profiles of expression of a panel of DNA repair genes (ddb1, ercc1, xpc, xrcc1, pcna, ogg1, parp1, parp2, ape, brca1, rad51, xrcc2, xrcc3, xrcc4, xrcc5, xrcc6 and gadd45), throughout the period of recovery, showed greater gene induction in coelomocytes compared with larvae, with particularly high expression of xrcc1, ercc1, parp2 and pcna. The heterogeneous response of larvae to DNA damage may reflect a strategy whereby a subset of the population is equipped to withstand acute genotoxic stress, while the ability of coelomocytes to resist and repair DNA damage confirm their significant role in protection against disease. Consideration of DNA repair capacity is critical for understanding effects of genotoxicants on organisms, in addition to shedding light on life strategies and disease susceptibility.
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Affiliation(s)
- Helena C Reinardy
- Molecular Discovery Laboratory, Bermuda Institute of Ocean Sciences, 17 Biological Station, St. George's, GE 01 Bermuda
| | - Andrea G Bodnar
- Molecular Discovery Laboratory, Bermuda Institute of Ocean Sciences, 17 Biological Station, St. George's, GE 01 Bermuda
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153
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Kienzler A, Mahler BJ, Van Metre PC, Schweigert N, Devaux A, Bony S. Exposure to runoff from coal-tar-sealed pavement induces genotoxicity and impairment of DNA repair capacity in the RTL-W1 fish liver cell line. THE SCIENCE OF THE TOTAL ENVIRONMENT 2015; 520:73-80. [PMID: 25795989 DOI: 10.1016/j.scitotenv.2015.03.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2014] [Revised: 02/26/2015] [Accepted: 03/02/2015] [Indexed: 06/04/2023]
Abstract
Coal-tar-based (CTB) sealcoat, frequently applied to parking lots and driveways in North America, contains elevated concentrations of polycyclic aromatic hydrocarbons (PAHs) and related compounds. The RTL-W1 fish liver cell line was used to investigate two endpoints (genotoxicity and DNA-repair-capacity impairment) associated with exposure to runoff from asphalt pavement with CTB sealcoat or with an asphalt-based sealcoat hypothesized to contain about 7% CTB sealcoat (AS-blend). Genotoxic potential was assessed by the Formamido pyrimidine glycosylase (Fpg)-modified comet assay for 1:10 and 1:100 dilutions of runoff samples collected from 5 h to 36 d following sealcoat application. DNA-repair capacity was assessed by the base excision repair comet assay for 1:10 dilution of samples collected 26 h and 36 d following application. Both assays were run with and without co-exposure to ultraviolet-A radiation (UVA). With co-exposure to UVA, genotoxic effects were significant for both dilutions of CTB runoff for three of four sample times, and for some samples of AS-blend runoff. Base excision repair was significantly impaired for CTB runoff both with and without UVA exposure, and for AS-blend runoff only in the absence of UVA. This study is the first to investigate the effects of exposure to the complex mixture of chemicals in coal tar on DNA repair capacity. The results indicate that co-exposure to runoff from CT-sealcoated pavement and UVA as much as a month after sealcoat application has the potential to cause genotoxicity and impair DNA repair capacity.
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Affiliation(s)
- Aude Kienzler
- Université de Lyon, UMR LEHNA 5023, USC INRA, ENTPE, rue Maurice Audin, Vaulx-en-Velin F-69518, France.
| | - Barbara J Mahler
- U.S. Geological Survey, 1505 Ferguson Lane, Austin, TX 78754, United States.
| | - Peter C Van Metre
- U.S. Geological Survey, 1505 Ferguson Lane, Austin, TX 78754, United States.
| | - Nathalie Schweigert
- Université de Lyon, UMR LEHNA 5023, USC INRA, ENTPE, rue Maurice Audin, Vaulx-en-Velin F-69518, France
| | - Alain Devaux
- Université de Lyon, UMR LEHNA 5023, USC INRA, ENTPE, rue Maurice Audin, Vaulx-en-Velin F-69518, France.
| | - Sylvie Bony
- Université de Lyon, UMR LEHNA 5023, USC INRA, ENTPE, rue Maurice Audin, Vaulx-en-Velin F-69518, France.
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154
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Thomas AD, Fahrer J, Johnson GE, Kaina B. Theoretical considerations for thresholds in chemical carcinogenesis. MUTATION RESEARCH-REVIEWS IN MUTATION RESEARCH 2015; 765:56-67. [PMID: 26281768 DOI: 10.1016/j.mrrev.2015.05.001] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2015] [Revised: 05/11/2015] [Accepted: 05/12/2015] [Indexed: 02/08/2023]
Abstract
There is increasing evidence for non-linear relationships for gene mutations, chromosomal aberrations and even tumor incidences in response to low doses of genotoxic carcinogens. To attain the biological relevance of such non-linear responses, there is a need to identify the underlying defense mechanisms that allow tolerance to low doses of genotoxicants. This communication discusses presumptive cancer prevention mechanisms that may contribute to thresholds, i.e. points of departure, for each endpoint, from initial DNA lesion to tumor formation. We discuss a sequential order of genome protection during carcinogenesis where genotoxicant scavenging, cellular efflux, DNA repair, elimination of damaged cells by apoptosis, autophagy, silencing by DNA damage-triggered replicative senescence, and finally, elimination of transformed (premalignant) cells by the immune system are thought to be responsible for a threshold in tumor formation. We highlight DNA repair, for which experimental evidence has been recently provided to dictate a role in PoDs. In conclusion, from a theoretical perspective it is reasonable to posit that tolerance to low dose levels exists for each requisite step of tumor formation and these tolerance mechanisms are critical in determining thresholds in chemical carcinogenesis.
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Affiliation(s)
- Adam D Thomas
- Institute of Toxicology, University Medical Centre, Mainz, Germany
| | - Jörg Fahrer
- Institute of Toxicology, University Medical Centre, Mainz, Germany
| | - George E Johnson
- Institue of Life Science, College of Medicine, Swansea, Wales, United Kingdom
| | - Bernd Kaina
- Institute of Toxicology, University Medical Centre, Mainz, Germany.
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155
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Bausinger J, Speit G. DNA repair capacity of cultured human lymphocytes exposed to mutagens measured by the comet assay and array expression analysis. Mutagenesis 2015; 30:811-20. [DOI: 10.1093/mutage/gev040] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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156
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Göder A, Nagel G, Kraus A, Dörsam B, Seiwert N, Kaina B, Fahrer J. Lipoic acid inhibits the DNA repair protein O 6-methylguanine-DNA methyltransferase (MGMT) and triggers its depletion in colorectal cancer cells with concomitant autophagy induction. Carcinogenesis 2015; 36:817-31. [PMID: 25998848 DOI: 10.1093/carcin/bgv070] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2014] [Accepted: 05/10/2015] [Indexed: 11/13/2022] Open
Abstract
Alkylating agents are present in food and tobacco smoke, but are also used in cancer chemotherapy, inducing the DNA lesion O (6)-methylguanine. This critical adduct is repaired by O (6)-methylguanine-DNA methyltransferase (MGMT), resulting in MGMT inactivation and degradation. In the present study, we analyzed the effects of the natural disulfide compound lipoic acid (LA) on MGMT in vitro and in colorectal cancer cells. We show that LA, but not its reduced form dihydrolipoic acid, potently inhibits the activity of recombinant MGMT by interfering with its catalytic Cys-145 residue, which was partially reversible by N-acetyl cysteine. Incubation of HCT116 colorectal cancer cells with LA altered their glutathione pool and caused a decline in MGMT activity. This was mirrored by LA-induced depletion of MGMT protein, which was not attributable to changes in MGMT messenger RNA levels. Loss of MGMT protein coincided with LA-induced autophagy, a process resulting in lysosomal degradation of proteins, including presumably MGMT. LA-stimulated autophagy in a p53-independent manner as revealed by the response of isogenic HCT116 cell lines. Knockdown of the crucial autophagy component beclin-1 and chemical inhibitors blocked LA-induced autophagy, but did not abrogate LA-triggered MGMT degradation. Concomitant with MGMT depletion, LA pretreatment resulted in enhanced O (6)-methylguanine levels in DNA. It also increased the cytotoxicity of the alkylating anticancer drug temozolomide in temozolomide-resistant colorectal cancer cells. Taken together, our study showed that the natural compound LA inhibits MGMT and induces autophagy. Furthermore, LA enhanced the cytotoxic effects of temozolomide, which makes it a candidate for a supplement in cancer therapy.
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Affiliation(s)
- Anja Göder
- Department of Toxicology, University Medical Center Mainz, Obere Zahlbacher Strasse 67, D-55131 Mainz, Germany
| | - Georg Nagel
- Department of Toxicology, University Medical Center Mainz, Obere Zahlbacher Strasse 67, D-55131 Mainz, Germany
| | - Alexander Kraus
- Department of Toxicology, University Medical Center Mainz, Obere Zahlbacher Strasse 67, D-55131 Mainz, Germany
| | - Bastian Dörsam
- Department of Toxicology, University Medical Center Mainz, Obere Zahlbacher Strasse 67, D-55131 Mainz, Germany
| | - Nina Seiwert
- Department of Toxicology, University Medical Center Mainz, Obere Zahlbacher Strasse 67, D-55131 Mainz, Germany
| | - Bernd Kaina
- Department of Toxicology, University Medical Center Mainz, Obere Zahlbacher Strasse 67, D-55131 Mainz, Germany
| | - Jörg Fahrer
- Department of Toxicology, University Medical Center Mainz, Obere Zahlbacher Strasse 67, D-55131 Mainz, Germany
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157
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Toprani SM, Das B. Radio-adaptive response of base excision repair genes and proteins in human peripheral blood mononuclear cells exposed to gamma radiation. Mutagenesis 2015; 30:663-76. [PMID: 25958388 DOI: 10.1093/mutage/gev032] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Radio-adaptive response is a mechanism whereby a low-dose exposure (priming dose) induces resistance to a higher dose (challenging dose) thus significantly reducing its detrimental effects. Radiation-induced DNA damage gets repaired through various DNA repair pathways in human cells depending upon the type of lesion. The base excision repair (BER) pathway repairs radiation-induced base damage, abasic sites and single-strand breaks in cellular DNA. In the present study, an attempt has been made to investigate the involvement of BER genes and proteins in the radio-adaptive response in human resting peripheral blood mononuclear cells (PBMC). Venous blood samples were collected from 20 randomly selected healthy male individuals with written informed consent. PBMC were isolated and irradiated at a priming dose of 0.1 Gy followed 4h later with a challenging dose of 2.0 Gy (primed cells). Quantitation of DNA damage was done using the alkaline comet assay immediately and expression profile of BER genes and proteins were studied 30 min after the challenging dose using real-time quantitative polymerase chain reaction and western blot, respectively. The overall result showed significant (P ≤ 0.05) reduction of DNA damage in terms of percentage of DNA in tail (%T) with a priming dose of 0.1 Gy followed by a challenging dose of 2.0 Gy after 4 h. Twelve individuals showed significant (P ≤ 0.05) reduction in %T whereas eight individuals showed marginal reduction in DNA damage that was not statistically significant. However, at the transcriptional level, BER genes such as APE1, FEN1 and LIGASE1 showed significant (P ≤ 0.05) up-regulation in both groups. Significant (P ≤ 0.05) up-regulation was also observed at the protein level for OGG1, APE1, MBD4, FEN1 and LIGASE1 in primed cells. Up-regulation of some BER genes and proteins such as APE1, FEN1 and LIGASE1 in primed cells of resting PBMC is suggestive of active involvement of the BER pathway in radio-adaptive response.
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Affiliation(s)
- Sneh M Toprani
- Low Level Radiation Research Section, Radiation Biology and Health Sciences Division, Bio-Sciences Group, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
| | - Birajalaxmi Das
- Low Level Radiation Research Section, Radiation Biology and Health Sciences Division, Bio-Sciences Group, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
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158
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Guérard M, Baum M, Bitsch A, Eisenbrand G, Elhajouji A, Epe B, Habermeyer M, Kaina B, Martus H, Pfuhler S, Schmitz C, Sutter A, Thomas A, Ziemann C, Froetschl R. Assessment of mechanisms driving non-linear dose–response relationships in genotoxicity testing. MUTATION RESEARCH-REVIEWS IN MUTATION RESEARCH 2015; 763:181-201. [DOI: 10.1016/j.mrrev.2014.11.001] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2014] [Revised: 10/31/2014] [Accepted: 11/01/2014] [Indexed: 01/15/2023]
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159
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Li B, Sun L, Cai J, Wang C, Wang M, Qiu H, Zuo Z. Modulation of the DNA repair system and ATR-p53 mediated apoptosis is relevant for tributyltin-induced genotoxic effects in human hepatoma G2 cells. J Environ Sci (China) 2015; 27:108-114. [PMID: 25597668 DOI: 10.1016/j.jes.2014.05.032] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2014] [Revised: 04/14/2014] [Accepted: 05/12/2014] [Indexed: 06/04/2023]
Abstract
The toxic effects of tributyltin (TBT) have been extensively documented in several types of cells, but the molecular mechanisms related to the genotoxic effects of TBT have still not been fully elucidated. Our study showed that exposure of human hepatoma G2 cells to 1-4 μmol/L TBT for 3 hr caused severe DNA damage in a concentration-dependent manner. Moreover, the expression levels of key DNA damage sensor genes such as the replication factor C, proliferating cell nuclear antigen and poly (ADP-ribose) polymerase-1 were inhabited in a concentration-dependent manner. We further demonstrated that TBT induced cell apoptosis via the p53-mediated pathway, which was most likely activated by the ataxia telangiectasia mutated and rad-3 related (ATR) protein kinase. The results also showed that cytochrome c, caspase-3, caspase-8, caspase-9, and the B-cell lymphoma 2 were involved in this process. Taken together, we demonstrated for the first time that the inhibition of the DNA repair system might be more responsible for TBT-induced genotoxic effects in cells. Then the generated DNA damage induced by TBT initiated ATR-p53-mediated apoptosis.
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Affiliation(s)
- Bowen Li
- State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Xiamen University, Xiamen 361102, China.
| | - Lingbin Sun
- State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Xiamen University, Xiamen 361102, China; Department of Gynaecology, The Affiliated Chenggong Hospital of Xiamen University, Xiamen 361002, China
| | - Jiali Cai
- Department of Gynaecology, The Affiliated Chenggong Hospital of Xiamen University, Xiamen 361002, China
| | - Chonggang Wang
- State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Xiamen University, Xiamen 361102, China
| | - Mengmeng Wang
- State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Xiamen University, Xiamen 361102, China
| | - Huiling Qiu
- Department of Gynaecology, The Affiliated Chenggong Hospital of Xiamen University, Xiamen 361002, China.
| | - Zhenghong Zuo
- State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Xiamen University, Xiamen 361102, China.
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160
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Shelke S, Das B. Dose response and adaptive response of non-homologous end joining repair genes and proteins in resting human peripheral blood mononuclear cells exposed to γ radiation. Mutagenesis 2014; 30:365-79. [PMID: 25473122 DOI: 10.1093/mutage/geu081] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Ionising radiation induces single-strand breaks, double-strand breaks (DSB) and base damages in human cell. DSBs are the most deleterious and if not repaired may lead to genomic instability and cell death. DSB can be repaired through non-homologous end joining (NHEJ) pathway in resting lymphocytes. In this study, NHEJ genes and proteins were studied in irradiated human peripheral blood mononuclear cells (PBMC) at resting stage. Dose-response, time point kinetics and adaptive-response studies were conducted in irradiated PBMC at various end points such as DNA damage quantitation, transcription and protein expression profile. Venous blood samples were collected from 20 random, normal and healthy donors with written informed consent. PBMC was separated and irradiated with various doses between 0.1 and 2.0 Gy ((60)CO-γ source) for dose-response study. Repair kinetics of DNA damage and time point changes in expression of genes and proteins were studied in post-irradiated PBMC at 2.0 Gy at various time points up to 240 min. Adaptive-response study was conducted with a priming dose of 0.1 Gy followed by a challenging dose of 2.0 Gy after 4-h incubation. Our results revealed that Ku70, Ku80, XLF and Ligase IV were significantly upregulated (P < 0.05) at 4-h post-irradiation at transcript and protein level. Adaptive-response study showed significantly increased expression of the proteins involved in NHEJ, suggesting their role in adaptive response in human PBMC at G0/G1, which has important implications to human health.
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Affiliation(s)
- Shridevi Shelke
- Low Level Radiation Research Section, Radiation Biology and Health Sciences Division, Bio-Sciences Group, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
| | - Birajalaxmi Das
- Low Level Radiation Research Section, Radiation Biology and Health Sciences Division, Bio-Sciences Group, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
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161
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Leão TL, da Fonseca FG. Subversion of cellular stress responses by poxviruses. World J Clin Infect Dis 2014; 4:27-40. [DOI: 10.5495/wjcid.v4.i4.27] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/29/2014] [Revised: 07/26/2014] [Accepted: 09/10/2014] [Indexed: 02/06/2023] Open
Abstract
Cellular stress responses are powerful mechanisms that prevent and cope with the accumulation of macromolecular damage in the cells and also boost host defenses against pathogens. Cells can initiate either protective or destructive stress responses depending, to a large extent, on the nature and duration of the stressing stimulus as well as the cell type. The productive replication of a virus within a given cell places inordinate stress on the metabolism machinery of the host and, to assure the continuity of its replication, many viruses have developed ways to modulate the cell stress responses. Poxviruses are among the viruses that have evolved a large number of strategies to manipulate host stress responses in order to control cell fate and enhance their replicative success. Remarkably, nearly every step of the stress responses that is mounted during infection can be targeted by virally encoded functions. The fine-tuned interactions between poxviruses and the host stress responses has aided virologists to understand specific aspects of viral replication; has helped cell biologists to evaluate the role of stress signaling in the uninfected cell; and has tipped immunologists on how these signals contribute to alert the cells against pathogen invasion and boost subsequent immune responses. This review discusses the diverse strategies that poxviruses use to subvert host cell stress responses.
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162
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Toprani SM, Das B. Role of base excision repair genes and proteins in gamma-irradiated resting human peripheral blood mononuclear cells. Mutagenesis 2014; 30:247-61. [DOI: 10.1093/mutage/geu065] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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163
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Pflaum J, Schlosser S, Müller M. p53 Family and Cellular Stress Responses in Cancer. Front Oncol 2014; 4:285. [PMID: 25374842 PMCID: PMC4204435 DOI: 10.3389/fonc.2014.00285] [Citation(s) in RCA: 192] [Impact Index Per Article: 19.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2014] [Accepted: 10/03/2014] [Indexed: 11/30/2022] Open
Abstract
p53 is an important tumor suppressor gene, which is stimulated by cellular stress like ionizing radiation, hypoxia, carcinogens, and oxidative stress. Upon activation, p53 leads to cell-cycle arrest and promotes DNA repair or induces apoptosis via several pathways. p63 and p73 are structural homologs of p53 that can act similarly to the protein and also hold functions distinct from p53. Today more than 40 different isoforms of the p53 family members are known. They result from transcription via different promoters and alternative splicing. Some isoforms have carcinogenic properties and mediate resistance to chemotherapy. Therefore, expression patterns of the p53 family genes can offer prognostic information in several malignant tumors. Furthermore, the p53 family constitutes a potential target for cancer therapy. Small molecules (e.g., Nutlins, RITA, PRIMA-1, and MIRA-1 among others) have been objects of intense research interest in recent years. They restore pro-apoptotic wild-type p53 function and were shown to break chemotherapeutic resistance. Due to p53 family interactions small molecules also influence p63 and p73 activity. Thus, the members of the p53 family are key players in the cellular stress response in cancer and are expected to grow in importance as therapeutic targets.
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Affiliation(s)
- Johanna Pflaum
- Department of Internal Medicine I, University Hospital Regensburg , Regensburg , Germany
| | - Sophie Schlosser
- Department of Internal Medicine I, University Hospital Regensburg , Regensburg , Germany
| | - Martina Müller
- Department of Internal Medicine I, University Hospital Regensburg , Regensburg , Germany
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164
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Hanada K, Uchida T, Tsukamoto Y, Watada M, Yamaguchi N, Yamamoto K, Shiota S, Moriyama M, Graham DY, Yamaoka Y. Helicobacter pylori infection introduces DNA double-strand breaks in host cells. Infect Immun 2014; 82:4182-9. [PMID: 25069978 PMCID: PMC4187860 DOI: 10.1128/iai.02368-14] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2014] [Accepted: 07/19/2014] [Indexed: 12/12/2022] Open
Abstract
Gastric cancer is an inflammation-related malignancy related to long-standing acute and chronic inflammation caused by infection with the human bacterial pathogen Helicobacter pylori. Inflammation can result in genomic instability. However, there are considerable data that H. pylori itself can also produce genomic instability both directly and through epigenetic pathways. Overall, the mechanisms of H. pylori-induced host genomic instabilities remain poorly understood. We used microarray screening of H. pylori-infected human gastric biopsy specimens to identify candidate genes involved in H. pylori-induced host genomic instabilities. We found upregulation of ATM expression in vivo in gastric mucosal cells infected with H. pylori. Using gastric cancer cell lines, we confirmed that the H. pylori-related activation of ATM was due to the accumulation of DNA double-strand breaks (DSBs). DSBs were observed following infection with both cag pathogenicity island (PAI)-positive and -negative strains, but the effect was more robust with cag PAI-positive strains. These results are consistent with the fact that infections with both cag PAI-positive and -negative strains are associated with gastric carcinogenesis, but the risk is higher in individuals infected with cag PAI-positive strains.
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Affiliation(s)
- Katsuhiro Hanada
- Department of Environmental and Preventive Medicine, Faculty of Medicine, Oita University, Yufu City, Oita, Japan Department of Medicine-Gastroenterology, Baylor College of Medicine, and Michael E. DeBakey Veterans Affairs Medical Center, Houston, Texas, USA
| | - Tomohisa Uchida
- Department of Molecular Pathology, Faculty of Medicine, Oita University, Yufu City, Oita, Japan
| | - Yoshiyuki Tsukamoto
- Department of Molecular Pathology, Faculty of Medicine, Oita University, Yufu City, Oita, Japan
| | - Masahide Watada
- Department of Environmental and Preventive Medicine, Faculty of Medicine, Oita University, Yufu City, Oita, Japan Department of Gastroenterology, Faculty of Medicine, Oita University, Yufu City, Oita, Japan
| | - Nahomi Yamaguchi
- Department of Environmental and Preventive Medicine, Faculty of Medicine, Oita University, Yufu City, Oita, Japan
| | - Kaoru Yamamoto
- Department of Environmental and Preventive Medicine, Faculty of Medicine, Oita University, Yufu City, Oita, Japan
| | - Seiji Shiota
- Department of Environmental and Preventive Medicine, Faculty of Medicine, Oita University, Yufu City, Oita, Japan
| | - Masatsugu Moriyama
- Department of Molecular Pathology, Faculty of Medicine, Oita University, Yufu City, Oita, Japan
| | - David Y Graham
- Department of Medicine-Gastroenterology, Baylor College of Medicine, and Michael E. DeBakey Veterans Affairs Medical Center, Houston, Texas, USA
| | - Yoshio Yamaoka
- Department of Environmental and Preventive Medicine, Faculty of Medicine, Oita University, Yufu City, Oita, Japan Department of Medicine-Gastroenterology, Baylor College of Medicine, and Michael E. DeBakey Veterans Affairs Medical Center, Houston, Texas, USA
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165
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Malewicz M, Perlmann T. Function of transcription factors at DNA lesions in DNA repair. Exp Cell Res 2014; 329:94-100. [PMID: 25173987 DOI: 10.1016/j.yexcr.2014.08.032] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2014] [Revised: 08/18/2014] [Accepted: 08/20/2014] [Indexed: 12/15/2022]
Abstract
Cellular systems for DNA repair ensure prompt removal of DNA lesions that threaten the genomic stability of the cell. Transcription factors (TFs) have long been known to facilitate DNA repair via transcriptional regulation of specific target genes encoding key DNA repair proteins. However, recent findings identified TFs as DNA repair components acting directly at the DNA lesions in a transcription-independent fashion. Together this recent progress is consistent with the hypothesis that TFs have acquired the ability to localize DNA lesions and function by facilitating chromatin remodeling at sites of damaged DNA. Here we review these recent findings and discuss how TFs may function in DNA repair.
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Affiliation(s)
- Michal Malewicz
- MRC Toxicology Unit, Lancaster Road, Leicester LE1 9HN, United Kingdom.
| | - Thomas Perlmann
- Ludwig Institute for Cancer Research (LICR), Department of Cell and Molecular Biology (CMB), Karolinska Institute, Nobels väg 3, S-171 77 Stockholm, Sweden
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166
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Ben-David E, Bester AC, Shifman S, Kerem B. Transcriptional dynamics in colorectal carcinogenesis: new insights into the role of c-Myc and miR17 in benign to cancer transformation. Cancer Res 2014; 74:5532-40. [PMID: 25125661 DOI: 10.1158/0008-5472.can-14-0932] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Colorectal cancer develops in a sequential, evolutionary process, leading to a heterogenic tumor. Comprehensive molecular studies of colorectal cancer have been previously performed; still, the process of carcinogenesis is not fully understood. We utilized gene expression patterns from 94 samples including normal, adenoma, and adenocarcinoma colon biopsies and performed a coexpression network analysis to determine gene expression trajectories of 8,000 genes across carcinogenesis. We found that the majority of gene expression changes occur in the transition from normal tissue to adenoma. The upregulated genes, known to be involved in cellular proliferation, included c-Myc along with its targets. In a cellular model system, we show that physiologic upregulation of c-Myc can lead to cellular proliferation without DNA replication stress. Our analysis also found that carcinogenesis involves a progressive downregulation of genes that are markers of colonic tissue and propose that this reflects a perturbed differentiation of colon cells during carcinogenesis. The analysis of miRNAs targets pointed toward the involvement of miR17 in the regulation of colon cell differentiation. Finally, we found that copy-number variations (CNV) enriched in colon adenocarcinoma tend to occur in genes whose expression changes already in adenoma, with deletions occurring in genes downregulated and duplications in genes upregulated in adenomas. We suggest that the CNVs are selected to reinforce changes in gene expression, rather than initiate them. Together, these findings shed new light into the molecular processes that underlie the transformation of colon tissue from normal to cancer and add a temporal context that has been hitherto lacking.
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Affiliation(s)
- Eyal Ben-David
- Department of Genetics, The Life Sciences Institute, Edmond J. Safra Campus, The Hebrew University, Jerusalem, Israel
| | - Assaf C Bester
- Department of Genetics, The Life Sciences Institute, Edmond J. Safra Campus, The Hebrew University, Jerusalem, Israel. Cancer Research Institute, Beth Israel Deaconess Cancer Center, Department of Medicine and Pathology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts.
| | - Sagiv Shifman
- Department of Genetics, The Life Sciences Institute, Edmond J. Safra Campus, The Hebrew University, Jerusalem, Israel.
| | - Batsheva Kerem
- Department of Genetics, The Life Sciences Institute, Edmond J. Safra Campus, The Hebrew University, Jerusalem, Israel
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167
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Tomicic MT, Aasland D, Naumann SC, Meise R, Barckhausen C, Kaina B, Christmann M. Translesion polymerase η is upregulated by cancer therapeutics and confers anticancer drug resistance. Cancer Res 2014; 74:5585-96. [PMID: 25125662 DOI: 10.1158/0008-5472.can-14-0953] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
DNA repair processes are a key determinant of the sensitivity of cancer cells to DNA-damaging chemotherapeutics, which may induce certain repair genes as a mechanism to promote resistance. Here, we report the results of a screen for repair genes induced in cancer cells treated with DNA crosslinking agents, which identified the translesion polymerase η (PolH) as a p53-regulated target acting as one defense against interstrand crosslink (ICL)-inducing agents. PolH was induced by fotemustine, mafosfamide, and lomustine in breast cancer, glioma, and melanoma cells in vitro and in vivo, with similar inductions observed in normal cells such as lymphocytes and diploid fibroblasts. PolH contributions to the protection against ICL-inducing agents were evaluated by its siRNA-mediated attenuation in cells, which elevated sensitivity to these drugs in all tumor cell models. Conversely, PolH overexpression protected cancer cells against these drugs. PolH attenuation reduced repair of ICL lesions as measured by host cell reactivation assays and enhanced persistence of γH2AX foci. Moreover, we observed a strong accumulation of PolH in the nucleus of drug-treated cells along with direct binding to damaged DNA. Taken together, our findings implicated PolH in ICL repair as a mechanism of cancer drug resistance and normal tissue protection.
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Affiliation(s)
- Maja T Tomicic
- Department of Toxicology, University Medical Center Mainz, Mainz, Germany
| | - Dorthe Aasland
- Department of Toxicology, University Medical Center Mainz, Mainz, Germany
| | - Steffen C Naumann
- Department of Toxicology, University Medical Center Mainz, Mainz, Germany
| | - Ruth Meise
- Department of Toxicology, University Medical Center Mainz, Mainz, Germany
| | | | - Bernd Kaina
- Department of Toxicology, University Medical Center Mainz, Mainz, Germany
| | - Markus Christmann
- Department of Toxicology, University Medical Center Mainz, Mainz, Germany.
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168
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Buraka E, Chen CYC, Gavare M, Grube M, Makarenkova G, Nikolajeva V, Bisenieks I, Brūvere I, Bisenieks E, Duburs G, Sjakste N. DNA-binding studies of AV-153, an antimutagenic and DNA repair-stimulating derivative of 1,4-dihydropiridine. Chem Biol Interact 2014; 220:200-7. [PMID: 25016077 DOI: 10.1016/j.cbi.2014.06.027] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2013] [Revised: 06/20/2014] [Accepted: 06/30/2014] [Indexed: 01/24/2023]
Abstract
UNLABELLED The ability to intercalate between DNA strands determines the cytotoxic activity of numerous anticancer drugs. Strikingly, intercalating activity was also reported for some compounds considered to be antimutagenic. The aim of this study was to determine the mode of interaction of DNA with the antimutagenic and DNA repair-stimulating dihydropyridine (DHP) AV-153. DNA and AV-153 interactions were studied by means of UV/VIS spectroscopy, fluorimetry and infrared spectroscopy. Compound AV-153 is a 1,4 dihydropyridine with ethoxycarbonyl groups in positions 3 and 5. Computer modeling of AV-153 and DNA interactions suggested an ability of the compound to dock between DNA strands at a single strand break site in the vicinity of two pyrimidines, which was confirmed in the present study. AV-153 evidently interacted with DNA, as addition of DNA to AV-153 solutions resulted in pronounced hyperchromic and bathochromic effects on the spectra. Base modification in a plasmid by peroxynitrite only minimally changed binding affinity of the compound; however, induction of single-strand breaks using Fenton's reaction greatly increased binding affinity. The affinity did not change when the ionic strength of the solution was changed from 5 to 150 mM NaCl, although it increased somewhat at 300 mM. Neither was it influenced by temperature changes from 25 to 40°C, however, it decreased when the pH of the solution was changed from 7.4 to 4.7. AV-153 competed with EBr for intercalation sites in DNA: 116 mM of the compound caused a two-fold decrease in fluorescence intensity. FT-IR spectral data analyses indicated formation of complexes between DNA and AV-153. The second derivative spectra analyses indicated interaction of AV-153 with guanine, cytosine and thymine bases, but no interaction with adenine was detected. CONCLUSIONS The antimutagenic substance AV-153 appears to intercalate between the DNA strands at the site of a DNA nick in the vicinity of two pyrimidines.
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Affiliation(s)
- E Buraka
- Department of Medical Biochemistry, Faculty of Medicine, University of Latvia, No. 4 Kronvalda Boulevard, Riga LV-1010, Latvia; Latvian Institute of Organic Synthesis, No. 21 Aizkraukles Street, Riga LV-1006, Latvia
| | - C Yu-Chian Chen
- Laboratory of Computational and Systems Biology, School of Chinese Medicine, China Medical University, Taichung 40402, Taiwan; Department of Bioinformatics, Asia University, Taichung 41354, Taiwan
| | - M Gavare
- Institute of Microbiology and Biotechnology, University of Latvia, No. 4 Kronvalda Boulevard, Riga LV-1010, Latvia
| | - M Grube
- Institute of Microbiology and Biotechnology, University of Latvia, No. 4 Kronvalda Boulevard, Riga LV-1010, Latvia
| | - G Makarenkova
- Faculty of Biology, University of Latvia, No. 4 Kronvalda Boulevard, Riga LV-1010, Latvia
| | - V Nikolajeva
- Faculty of Biology, University of Latvia, No. 4 Kronvalda Boulevard, Riga LV-1010, Latvia
| | - I Bisenieks
- Latvian Institute of Organic Synthesis, No. 21 Aizkraukles Street, Riga LV-1006, Latvia
| | - I Brūvere
- Latvian Institute of Organic Synthesis, No. 21 Aizkraukles Street, Riga LV-1006, Latvia
| | - E Bisenieks
- Latvian Institute of Organic Synthesis, No. 21 Aizkraukles Street, Riga LV-1006, Latvia
| | - G Duburs
- Latvian Institute of Organic Synthesis, No. 21 Aizkraukles Street, Riga LV-1006, Latvia
| | - N Sjakste
- Department of Medical Biochemistry, Faculty of Medicine, University of Latvia, No. 4 Kronvalda Boulevard, Riga LV-1010, Latvia; Latvian Institute of Organic Synthesis, No. 21 Aizkraukles Street, Riga LV-1006, Latvia.
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169
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Ciszewski WM, Wagner W, Kania KD, Dastych J. Interleukin-4 enhances PARP-dependent DNA repair activity in vitro. J Interferon Cytokine Res 2014; 34:734-40. [PMID: 24724620 DOI: 10.1089/jir.2014.0029] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Eukaryotic cells possess several DNA repair mechanisms, including homologous recombination and the non-homologous end-joining (NHEJ) system. There are two known NHEJ systems. The major mechanism depends on the catalytic unit of DNA-dependent protein kinase (DNA-PKcs) and DNA ligase IV, and an alternative mechanism (B-NHEJ) depends on poly(ADP-ribose) polymerase (PARP). These systems are upregulated by genotoxic agents. Interleukin 4 (IL-4) is an immunoregulatory cytokine that is secreted by immune cells upon contact with certain genotoxic compounds and is known to regulate several genes encoding components of DNA repair systems in human monocytes. We have investigated the possible effects of IL-4 on the DNA repair process within murine and human cells exposed to selected genotoxic compounds. In a series of experiments, including the comet assay, cell surface annexin V staining, analysis of histone H2AX phosphorylation, and a DNA end-joining assay, we observed that IL-4 decreased DNA damage in murine fibroblasts and human glioblastoma cells exposed to genotoxic agents and increased DNA ligation activity in the nuclei of these cells in a process that depended on PARP. These observations suggest that IL-4 is capable of upregulating the alternative NHEJ DNA repair mechanism in murine and human cells.
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Affiliation(s)
- Wojciech Michał Ciszewski
- 1 Laboratory of Cellular Immunology, Institute of Medical Biology , Polish Academy of Sciences, Lodz, Poland
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170
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Rauch A, Hennig D, Schäfer C, Wirth M, Marx C, Heinzel T, Schneider G, Krämer OH. Survivin and YM155: how faithful is the liaison? Biochim Biophys Acta Rev Cancer 2014; 1845:202-20. [PMID: 24440709 DOI: 10.1016/j.bbcan.2014.01.003] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2013] [Revised: 01/01/2014] [Accepted: 01/04/2014] [Indexed: 02/07/2023]
Abstract
Survivin belongs to the family of apoptosis inhibitors (IAPs), which antagonizes the induction of cell death. Dysregulated expression of IAPs is frequently observed in cancers, and the high levels of survivin in tumors compared to normal adult tissues make it an attractive target for pharmacological interventions. The small imidazolium-based compound YM155 has recently been reported to block the expression of survivin via inhibition of the survivin promoter. Recent data, however, question that this is the sole and main effect of this drug, which is already being tested in ongoing clinical studies. Here, we critically review the current data on YM155 and other new experimental agents supposed to antagonize survivin. We summarize how cells from various tumor entities and with differential expression of the tumor suppressor p53 respond to this agent in vitro and as murine xenografts. Additionally, we recapitulate clinical trials conducted with YM155. Our article further considers the potency of YM155 in combination with other anti-cancer agents and epigenetic modulators. We also assess state-of-the-art data on the sometimes very promiscuous molecular mechanisms affected by YM155 in cancer cells.
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Affiliation(s)
- Anke Rauch
- Center for Molecular Biomedicine, Institute for Biochemistry and Biophysics, Department of Biochemistry, Friedrich Schiller University of Jena, Hans-Knöll-Straße 2, 07745 Jena, Germany
| | - Dorle Hennig
- Center for Molecular Biomedicine, Institute for Biochemistry and Biophysics, Department of Biochemistry, Friedrich Schiller University of Jena, Hans-Knöll-Straße 2, 07745 Jena, Germany
| | - Claudia Schäfer
- Center for Molecular Biomedicine, Institute for Biochemistry and Biophysics, Department of Biochemistry, Friedrich Schiller University of Jena, Hans-Knöll-Straße 2, 07745 Jena, Germany
| | - Matthias Wirth
- II Department of Internal Medicine, Technical University of Munich, Munich, Germany
| | - Christian Marx
- Center for Molecular Biomedicine, Institute for Biochemistry and Biophysics, Department of Biochemistry, Friedrich Schiller University of Jena, Hans-Knöll-Straße 2, 07745 Jena, Germany
| | - Thorsten Heinzel
- Center for Molecular Biomedicine, Institute for Biochemistry and Biophysics, Department of Biochemistry, Friedrich Schiller University of Jena, Hans-Knöll-Straße 2, 07745 Jena, Germany
| | - Günter Schneider
- II Department of Internal Medicine, Technical University of Munich, Munich, Germany
| | - Oliver H Krämer
- Department of Toxicology, University Medical Center, Obere Zahlbacher Str. 67, 55131 Mainz, Germany.
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171
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Thrivikraman G, Madras G, Basu B. In vitro/In vivo assessment and mechanisms of toxicity of bioceramic materials and its wear particulates. RSC Adv 2014. [DOI: 10.1039/c3ra44483j] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
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172
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Martins IJ, Creegan R. Links between Insulin Resistance, Lipoprotein Metabolism and Amyloidosis in Alzheimer’s Disease. Health (London) 2014. [DOI: 10.4236/health.2014.612190] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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