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Wu X, Zhou X, Wang S, Mao G. DNA damage response(DDR): a link between cellular senescence and human cytomegalovirus. Virol J 2023; 20:250. [PMID: 37915066 PMCID: PMC10621139 DOI: 10.1186/s12985-023-02203-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2023] [Accepted: 10/04/2023] [Indexed: 11/03/2023] Open
Abstract
The DNA damage response (DDR) is a signaling cascade that is triggered by DNA damage, involving the halting of cell cycle progression and repair. It is a key event leading to senescence, which is characterized by irreversible cell cycle arrest and the senescence-associated secretory phenotype (SASP) that includes the expression of inflammatory cytokines. Human cytomegalovirus (HCMV) is a ubiquitous pathogen that plays an important role in the senescence process. It has been established that DDR is necessary for HCMV to replicate effectively. This paper reviews the relationship between DDR, cellular senescence, and HCMV, providing new sights for virus-induced senescence (VIS).
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Affiliation(s)
- Xinna Wu
- Affiliated Zhejiang Hospital, Zhejiang University School of Medicine, Hangzhou, 310030, China
| | - Xuqiang Zhou
- College of Life Science, Zhejiang Chinese Medical University, Hangzhou, 310053, China
| | - Sanying Wang
- Zhejiang Provincial Key Lab of Geriatrics & Geriatrics Institute of Zhejiang Province, Department of Geriatrics, Zhejiang Hospital, Hangzhou, 310030, China.
| | - Genxiang Mao
- Affiliated Zhejiang Hospital, Zhejiang University School of Medicine, Hangzhou, 310030, China.
- Zhejiang Provincial Key Lab of Geriatrics & Geriatrics Institute of Zhejiang Province, Department of Geriatrics, Zhejiang Hospital, Hangzhou, 310030, China.
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Programmed expression of pro-apoptotic BMCC1 during apoptosis, triggered by DNA damage in neuroblastoma cells. BMC Cancer 2019; 19:542. [PMID: 31170959 PMCID: PMC6555734 DOI: 10.1186/s12885-019-5772-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Accepted: 05/29/2019] [Indexed: 11/10/2022] Open
Abstract
Background The multi-functional BMCC1 (BCH motif-containing molecule at the carboxyl terminal region 1)/PRUNE2 plays a clear role in suppression of tumor activity. In the patients with neuroblastoma (NB), reduced expression of BMCC1 in primary tumor tissues was associated with poor prognosis. By contrast, enforced expression of BMCC1 as well as elevated expression of BMCC1 in response to DNA-damage promotes apoptosis by abrogating Akt-mediated survival pathways. Methods We addressed molecular mechanisms underlying changes in regulation of BMCC1 expression during the process of apoptosis, which was promoted by a DNA-damaging drug Cisplatin (CDDP), in NB-derived cells. Results Elevated expression of BMCC1 was identified as an early response to DNA damage, which is accompanied by phosphorylation of ataxia telangiectasia mutated kinase (ATM) and accumulation of E2F1. Indeed, inhibition of ATM using an ATM inhibitor resulted in a decrease in expression of BMCC1 at mRNA levels. In addition, an E2F-binding sight was required for activation of BMCC1 promoter in response to DNA damage. On the other hand, knockdown of E2F1 yielded abrogated induction of BMCC1 in the cells after treatment with CDDP, suggesting that BMCC1 accumulation was caused by ATM-E2F1-dependent transcription. Finally, we demonstrated that full-length BMCC1 was proteolytically cleaved by apoptosis-activated caspase-9 during advanced stages of apoptosis in SK-N-AS cells. Conclusions In this study, we demonstrated the programmed expression of full-length BMCC1 in human NB cells undergoing DNA damage-induced apoptosis. The elucidation of the molecular mechanisms controlling the regulation of BMCC1 during apoptosis initiated by DNA damage provides useful information for understanding drug resistance of tumor cells and spontaneous regression of NB. Electronic supplementary material The online version of this article (10.1186/s12885-019-5772-4) contains supplementary material, which is available to authorized users.
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Gao Y, Yin J, Tu Y, Chen YC. Theaflavin-3,3'-Digallate Suppresses Human Ovarian Carcinoma OVCAR-3 Cells by Regulating the Checkpoint Kinase 2 and p27 kip1 Pathways. Molecules 2019; 24:molecules24040673. [PMID: 30769778 PMCID: PMC6412557 DOI: 10.3390/molecules24040673] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2019] [Revised: 02/09/2019] [Accepted: 02/12/2019] [Indexed: 12/26/2022] Open
Abstract
Theaflavin-3,3′-digallate (TF3) is a unique polyphenol in black tea. Epidemiological studies have proved that black tea consumption decreases the incidence rate of ovarian cancer. Our former research demonstrated that TF3 inhibited human ovarian cancer cells. Nevertheless, the roles of checkpoint kinase 2 (Chk2) and p27 kip1 (p27) in TF3-mediated inhibition of human ovarian cancer cells have not yet been investigated. In the current study, TF3 enhanced the phosphorylation of Chk2 to modulate the ratio of pro/anti-apoptotic Bcl-2 family proteins to initiate intrinsic apoptosis in a p53-independent manner and increased the expression of death receptors to activate extrinsic apoptosis in OVCAR-3 human ovarian carcinoma cells. In addition, TF3 up-regulated the expression of p27 to induce G0/G1 cell cycle arrest in OVCAR-3 cells. Our study indicated that Chk2 and p27 were vital anticancer targets of TF3 and provided more evidence that TF3 might be a potent agent to be applied as adjuvant treatment for ovarian cancer.
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Affiliation(s)
- Ying Gao
- Tea Research Institute Chinese Academy of Agricultural Sciences, Ministry of Agriculture, Hangzhou 310008, China.
| | - Junfeng Yin
- Tea Research Institute Chinese Academy of Agricultural Sciences, Ministry of Agriculture, Hangzhou 310008, China.
| | - Youying Tu
- Department of Tea Science, Zhejiang University, Hangzhou 310058, China.
| | - Yi Charlie Chen
- College of Science, Technology and Mathematics, Alderson Broaddus University, Philippi, WV 26416, USA.
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Kim D, Liu Y, Oberly S, Freire R, Smolka MB. ATR-mediated proteome remodeling is a major determinant of homologous recombination capacity in cancer cells. Nucleic Acids Res 2018; 46:8311-8325. [PMID: 30010936 PMCID: PMC6144784 DOI: 10.1093/nar/gky625] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2018] [Accepted: 06/28/2018] [Indexed: 12/20/2022] Open
Abstract
The ATR kinase is crucial for genome maintenance, but the mechanisms by which ATR controls the DNA repair machinery are not fully understood. Here, we find that long-term chronic inhibition of ATR signaling severely impairs the ability of cells to utilize homologous recombination (HR)-mediated DNA repair. Proteomic analysis shows that chronic ATR inhibition depletes the abundance of key HR factors, suggesting that spontaneous ATR signaling enhances the capacity of cells to use HR-mediated repair by controlling the abundance of the HR machinery. Notably, ATR controls the abundance of HR factors largely via CHK1-dependent transcription, and can also promote stabilization of specific HR proteins. Cancer cells exhibit a strong dependency on ATR signaling for maintaining elevated levels of HR factors, and we propose that increased constitutive ATR signaling caused by augmented replication stress in cancer cells drives the enhanced HR capacity observed in certain tumor types. Overall, these findings define a major pro-HR function for ATR and have important implications for therapy by providing rationale for sensitizing HR-proficient cancer cells to PARP inhibitors.
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Affiliation(s)
- Dongsung Kim
- Department of Molecular Biology and Genetics, Weill Institute for Cell and Molecular Biology, Cornell University, Ithaca, NY 14853, USA
| | - Yi Liu
- Department of Molecular Biology and Genetics, Weill Institute for Cell and Molecular Biology, Cornell University, Ithaca, NY 14853, USA
| | - Susannah Oberly
- Department of Molecular Biology and Genetics, Weill Institute for Cell and Molecular Biology, Cornell University, Ithaca, NY 14853, USA
| | - Raimundo Freire
- Unidad de Investigación, Hospital Universitario de Canarias, Instituto de Tecnologias Biomedicas, 38320 Tenerife, Spain
| | - Marcus B Smolka
- Department of Molecular Biology and Genetics, Weill Institute for Cell and Molecular Biology, Cornell University, Ithaca, NY 14853, USA
- To whom correspondence should be addressed. Tel: +1 607 255 0274; Fax: +1 607 255 5961;
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Chiang KC, Yeh TS, Huang CC, Chang YC, Juang HH, Cheng CT, Pang JHS, Hsu JT, Takano M, Chen TC, Kittaka A, Hsiao M, Yeh CN. MART-10 represses cholangiocarcinoma cell growth and high vitamin D receptor expression indicates better prognosis for cholangiocarcinoma. Sci Rep 2017; 7:43773. [PMID: 28256614 PMCID: PMC5335655 DOI: 10.1038/srep43773] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2016] [Accepted: 01/30/2017] [Indexed: 12/14/2022] Open
Abstract
Cholangiocarcinoma (CCA) is a devastating disease due to no effective treatments available. Since the non-mineral functions of vitamin D emerges, 1α,25(OH)2D3, the active form of vitamin D, has been applied in anti-cancer researches. In this study, we demonstrated that both the 1α,25(OH)2D3 analog, MART-10, and 1α,25(OH)2D3 possessed anti-growth effect on human CCA cells with MART-10 much more potent than 1α,25(OH)2D3. The growth inhibition of both drugs were mediated by induction of G0/G1 cell cycle arrest through upregulation of p27 and downregulation of CDK4, CDK6, and cyclin D3. Human neutrophil gelatinase associated lipocalin (NGAL) was found to be involved in 1α,25(OH)2D3 and MART-10 meditated growth inhibition for CCA as knockdown of NGAL decreased Ki-67 expression in SNU308 cells and rendered SNU308 cells less responsive to 1α,25(OH)2D3 and MART-10 treatment. Vitamin D receptor (VDR) knockdown partly abolished MART-10-induced inhibition of NGAL and cell growth in SNU308 cells. The xenograft animal study demonstrated MART-10 could effectively repressed CCA growth in vivo without inducing obvious side effects. The IHC examination of human CCA specimen for VDR revealed that higher VDR expression was linked with better prognosis. Collectively, our results suggest that MART-10 could be a promising regimen for CCA treatment.
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Affiliation(s)
- Kun-Chun Chiang
- General Surgery Department, Chang Gung Memorial Hospital, Chang Gung University, Keelung, R.O.C, Taiwan.,Director of Zebrafish center of Keelung Chang Gung Memorial Hospital, R.O.C, Taiwan
| | - Ta-Sen Yeh
- General Surgery Department and Liver research center, Chang Gung Memorial Hospital, Chang Gung University, Kwei-Shan, Taoyuan, R.O.C, Taiwan
| | - Cheng-Cheng Huang
- Department of Pathology, Chang Gung Memorial Hospital, 222, Mai-Chin Road, Keelung, R.O.C, Taiwan
| | - Yu-Chan Chang
- Genomics Research Center, Academia Sinica, Taipei, R.O.C, Taiwan
| | - Horng-Heng Juang
- Department of Anatomy, College of Medicine, Chang Gung University, Kwei-Shan, Taoyuan, 333, R.O.C, Taiwan
| | - Chi-Tung Cheng
- General Surgery Department and Liver research center, Chang Gung Memorial Hospital, Chang Gung University, Kwei-Shan, Taoyuan, R.O.C, Taiwan
| | - Jong-Hwei S Pang
- Graduate Institute of Clinical Medical Sciences, College of Medicine, Chang Gung University, Kwei-Shan, Taoyuan, R.O.C, Taiwan
| | - Jun-Te Hsu
- General Surgery Department and Liver research center, Chang Gung Memorial Hospital, Chang Gung University, Kwei-Shan, Taoyuan, R.O.C, Taiwan
| | - Masashi Takano
- Faculty of Pharmaceutical Sciences, Teikyo University, Sagamihara, Kanagawa, 252-5195, Japan
| | - Tai C Chen
- Boston University School of Medicine, M-1022, 715 Albany Street, Boston, MA 02118, USA
| | - Atsushi Kittaka
- Faculty of Pharmaceutical Sciences, Teikyo University, Sagamihara, Kanagawa, 252-5195, Japan
| | - Michael Hsiao
- Genomics Research Center, Academia Sinica, Taipei, R.O.C, Taiwan
| | - Chun-Nan Yeh
- General Surgery Department and Liver research center, Chang Gung Memorial Hospital, Chang Gung University, Kwei-Shan, Taoyuan, R.O.C, Taiwan
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Banerji B, Killi SK, Katarkar A, Chatterjee S, Tangella Y, Prodhan C, Chaudhuri K. Neo-tanshinlactone D-ring modified novel analogues induce apoptosis in human breast cancer cell via DNA damage. Bioorg Med Chem 2017; 25:202-212. [DOI: 10.1016/j.bmc.2016.10.026] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2016] [Revised: 10/19/2016] [Accepted: 10/20/2016] [Indexed: 01/27/2023]
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Chiang KC, Yeh TS, Wu RC, Pang JHS, Cheng CT, Wang SY, Juang HH, Yeh CN. Lipocalin 2 (LCN2) is a promising target for cholangiocarcinoma treatment and bile LCN2 level is a potential cholangiocarcinoma diagnostic marker. Sci Rep 2016; 6:36138. [PMID: 27782193 PMCID: PMC5080596 DOI: 10.1038/srep36138] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2016] [Accepted: 10/10/2016] [Indexed: 02/08/2023] Open
Abstract
Cholangiocarcinoma (CCA) is a devastating disease due to resistance to traditional chemotherapies and radiotherapies. New therapeutic strategies against CCA are urgently needed. This study investigated the role of lipocalin-2 (LCN2) in human cholangiocarcinoma as a potential therapeutic target and diagnostic marker. So far, the role of LCN2 in cancer is still controversial and studies regarding the role of LCN2 in CCA are limited. LCN2 knockdown inhibited CCA cell growth in vitro and in vivo through induction of cell cycle arrest at G0/G1 phases and decreased metastatic potential due to repression of epithelial-mesenchymal transition (EMT). Overexpression of LCN2 in CCA cells increased cell metastatic potential. We showed for the first time that the N-myc downstream regulated gene 1 (NDRG1) and NDRG2, known as tumor suppressor genes, are negatively regulated by LCN2 in CCA cells. LCN2 concentration in bile was higher in patients with CCA than that in patients with gallstones, with a cutoff value of 20.08 ng/ml making this a potential diagnostic marker. Higher LCN2 expression was associated with worse survival in patients with CCA. LCN2 is a promising target for CCA treatment and bile LCN2 level is a potential diagnostic marker for CCA.
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Affiliation(s)
- Kun-Chun Chiang
- General Surgery Department, Chang Gung Memorial Hospital, Chang Gung University, Keelung, Taiwan, R.O.C.,Director of Zebrafish center of Keelung Chang Gung Memorial Hospital, Taiwan, R.O.C
| | - Ta-Sen Yeh
- General Surgery Department and Liver research center, Chang Gung Memorial Hospital, Chang Gung University, Kwei-Shan, Taoyuan, Taiwan, R.O.C
| | - Ren-Chin Wu
- Department of Pathology and Liver research center, Chang Gung Memorial Hospital, Chang Gung University, Kwei-Shan, Taoyuan, Taiwan, R.O.C
| | - Jong-Hwei S Pang
- Graduate Institute of Clinical Medical Sciences, College of Medicine, Chang Gung University, Kwei-Shan, Taoyuan, Taiwan, R.O.C
| | - Chi-Tung Cheng
- General Surgery Department and Liver research center, Chang Gung Memorial Hospital, Chang Gung University, Kwei-Shan, Taoyuan, Taiwan, R.O.C
| | - Shang-Yu Wang
- General Surgery Department and Liver research center, Chang Gung Memorial Hospital, Chang Gung University, Kwei-Shan, Taoyuan, Taiwan, R.O.C
| | - Horng-Heng Juang
- Department of Anatomy, College of Medicine, Chang Gung University, Kwei-Shan Taoyuan, Taiwan, 333, R.O.C.,Department of Urology, Chang Gung Memorial Hospital, Kwei-Shan, Tao-Yuan, Taiwan, ROC
| | - Chun-Nan Yeh
- General Surgery Department and Liver research center, Chang Gung Memorial Hospital, Chang Gung University, Kwei-Shan, Taoyuan, Taiwan, R.O.C
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Khalid S, Hanif R, Tareen SH, Siddiqa A, Bibi Z, Ahmad J. Formal modeling and analysis of ER- α associated Biological Regulatory Network in breast cancer. PeerJ 2016; 4:e2542. [PMID: 27781158 PMCID: PMC5075711 DOI: 10.7717/peerj.2542] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2016] [Accepted: 09/07/2016] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND Breast cancer (BC) is one of the leading cause of death among females worldwide. The increasing incidence of BC is due to various genetic and environmental changes which lead to the disruption of cellular signaling network(s). It is a complex disease in which several interlinking signaling cascades play a crucial role in establishing a complex regulatory network. The logical modeling approach of René Thomas has been applied to analyze the behavior of estrogen receptor-alpha (ER-α) associated Biological Regulatory Network (BRN) for a small part of complex events that leads to BC metastasis. METHODS A discrete model was constructed using the kinetic logic formalism and its set of logical parameters were obtained using the model checking technique implemented in the SMBioNet software which is consistent with biological observations. The discrete model was further enriched with continuous dynamics by converting it into an equivalent Petri Net (PN) to analyze the logical parameters of the involved entities. RESULTS In-silico based discrete and continuous modeling of ER-α associated signaling network involved in BC provides information about behaviors and gene-gene interaction in detail. The dynamics of discrete model revealed, imperative behaviors represented as cyclic paths and trajectories leading to pathogenic states such as metastasis. Results suggest that the increased expressions of receptors ER-α, IGF-1R and EGFR slow down the activity of tumor suppressor genes (TSGs) such as BRCA1, p53 and Mdm2 which can lead to metastasis. Therefore, IGF-1R and EGFR are considered as important inhibitory targets to control the metastasis in BC. CONCLUSION The in-silico approaches allow us to increase our understanding of the functional properties of living organisms. It opens new avenues of investigations of multiple inhibitory targets (ER-α, IGF-1R and EGFR) for wet lab experiments as well as provided valuable insights in the treatment of cancers such as BC.
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Affiliation(s)
- Samra Khalid
- Atta-ur-Rahman School of Applied Biosciences (ASAB)/Healthcare Biotechnology, National University of Science and Technology, Islamabad, Pakistan
| | - Rumeza Hanif
- Atta-ur-Rahman School of Applied Biosciences (ASAB)/Healthcare Biotechnology, National University of Science and Technology, Islamabad, Pakistan
| | - Samar H.K. Tareen
- Maastricht Centre for Systems Biology (MaCSBio), Maastricht University, Maastricht, Netherlands
| | - Amnah Siddiqa
- Research Center for Modeling & Simulation (RCMS), National University of Science and Technology, Islamabad, Pakistan
| | - Zurah Bibi
- Research Center for Modeling & Simulation (RCMS), National University of Science and Technology, Islamabad, Pakistan
| | - Jamil Ahmad
- Research Center for Modeling & Simulation (RCMS), National University of Science and Technology, Islamabad, Pakistan
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Attene-Ramos MS, Wagner ED, Plewa MJ. Comparative human cell toxicogenomic analysis of monohaloacetic acid drinking water disinfection byproducts. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2010; 44:7206-12. [PMID: 20540539 DOI: 10.1021/es1000193] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
The monohaloacetic acids (monoHAAs), iodoacetic, bromoacetic and chloroacetic acids are toxic disinfection byproducts. In vitro toxicological end points were integrated with DNA damage and repair pathway-focused toxicogenomic analyses to evaluate monoHAA-induced alterations of gene expression in normal nontransformed human cells. When compared to concurrent control transcriptome profiles, metabolic pathways involved in the cellular responses to toxic agents were identified and provided insight into the biological mechanisms of toxicity. Using the Database for Annotation, Visualization and Integrated Discovery to analyze the gene array data, the majority of the altered transcriptome profiles were associated with genes responding to DNA damage or those regulating cell cycle or apoptosis. The major pathways involved with altered gene expression were ATM, MAPK, p53, BRCA1, BRCA2, and ATR. These latter pathways highlight the involvement of DNA repair, especially the repair of double strand DNA breaks. All of the resolved pathways are involved in human cell stress response to DNA damage and regulate different stages in cell cycle progression or apoptosis.
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Affiliation(s)
- Matias S Attene-Ramos
- Department of Crop Sciences, College of Agricultural, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
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Zhu F, Dollé MET, Berton TR, Kuiper RV, Capps C, Espejo A, McArthur MJ, Bedford MT, van Steeg H, de Vries A, Johnson DG. Mouse models for the p53 R72P polymorphism mimic human phenotypes. Cancer Res 2010; 70:5851-9. [PMID: 20587514 DOI: 10.1158/0008-5472.can-09-4646] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The p53 tumor suppressor gene contains a common single nucleotide polymorphism (SNP) that results in either an arginine or proline at position 72 of the p53 protein. This polymorphism affects the apoptotic activity of p53 but the mechanistic basis and physiologic relevance of this phenotypic difference remain unclear. Here, we describe the development of mouse models for the p53 R72P SNP using two different approaches. In both sets of models, the human or humanized p53 proteins are functional as evidenced by the transcriptional induction of p53 target genes in response to DNA damage and the suppression of early lymphomagenesis. Consistent with in vitro studies, mice expressing the 72R variant protein (p53R) have a greater apoptotic response to several stimuli compared with mice expressing the p53P variant. Molecular studies suggest that both transcriptional and nontranscriptional mechanisms may contribute to the differential abilities of the p53 variants to induce apoptosis. Despite a difference in the acute response to UV radiation, no difference in the tumorigenic response to chronic UV exposure was observed between the polymorphic mouse models. These findings suggest that under at least some conditions, the modulation of apoptosis by the R72P polymorphism does not affect the process of carcinogenesis.
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Affiliation(s)
- Feng Zhu
- Department of Carcinogenesis, Science Park-Research Division, The University of Texas MD Anderson Cancer Center, Smithville, Texas 78957, USA
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Liontos M, Niforou K, Velimezi G, Vougas K, Evangelou K, Apostolopoulou K, Vrtel R, Damalas A, Kontovazenitis P, Kotsinas A, Zoumpourlis V, Tsangaris GT, Kittas C, Ginsberg D, Halazonetis TD, Bartek J, Gorgoulis VG. Modulation of the E2F1-driven cancer cell fate by the DNA damage response machinery and potential novel E2F1 targets in osteosarcomas. THE AMERICAN JOURNAL OF PATHOLOGY 2009; 175:376-91. [PMID: 19541929 PMCID: PMC2708823 DOI: 10.2353/ajpath.2009.081160] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 03/27/2009] [Indexed: 12/30/2022]
Abstract
Osteosarcoma is the most common primary bone cancer. Mutations of the RB gene represent the most frequent molecular defect in this malignancy. A major consequence of this alteration is that the activity of the key cell cycle regulator E2F1 is unleashed from the inhibitory effects of pRb. Studies in animal models and in human cancers have shown that deregulated E2F1 overexpression possesses either "oncogenic" or "oncosuppressor" properties, depending on the cellular context. To address this issue in osteosarcomas, we examined the status of E2F1 relative to cell proliferation and apoptosis in a clinical setting of human primary osteosarcomas and in E2F1-inducible osteosarcoma cell line models that are wild-type and deficient for p53. Collectively, our data demonstrated that high E2F1 levels exerted a growth-suppressing effect that relied on the integrity of the DNA damage response network. Surprisingly, induction of p73, an established E2F1 target, was also DNA damage response-dependent. Furthermore, a global proteome analysis associated with bioinformatics revealed novel E2F1-regulated genes and potential E2F1-driven signaling networks that could provide useful targets in challenging this aggressive neoplasm by innovative therapies.
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Affiliation(s)
- Michalis Liontos
- Department of Histology and Embryology, School of Medicine, University of Athens, Athens, Greece
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Udayakumar TS, Hachem P, Ahmed MM, Agrawal S, Pollack A. Antisense MDM2 enhances E2F1-induced apoptosis and the combination sensitizes androgen-sensitive [corrected] and androgen-insensitive [corrected] prostate cancer cells to radiation. Mol Cancer Res 2009; 6:1742-54. [PMID: 19010821 DOI: 10.1158/1541-7786.mcr-08-0102] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
We have previously shown in separate studies that MDM2 knockdown via antisense MDM2 (AS-MDM2) and E2F1 overexpression via adenoviral-mediated E2F1 (Ad-E2F1) sensitized prostate cancer cells to radiation. Because E2F1 and MDM2 affect apoptosis through both common and independent pathways, we hypothesized that coupling these two treatments would result in increased killing of prostate cancer cells. In this study, the effect of Ad-E2F1 and AS-MDM2 in combination with radiation was investigated in three prostate cancer cell lines: LNCaP cells, LNCaP-Res cells [androgen insensitive with functional p53 and androgen receptor (AR)], and PC3 cells (androgen insensitive, p53(null), and AR(null)). A supra-additive radiosensitizing effect was observed in terms of clonogenic inhibition and induction of apoptosis (caspase-3 + caspase-7 activity) in response to Ad-E2F1 plus AS-MDM2 treatments in all three cell lines. In LNCaP and LNCaP-Res, these combination treatments elevated the levels of phospho-Ser(15) p53 with significant induction of p21(waf1/cip1), phospho-gammaH2AX, PUMA, and Bax levels and reduction of AR and bcl-2 expression. Similarly, AR(null) and p53(null) PC-3 cells showed elevated levels of Bax and phospho-gammaH2AX expression. These findings show that the combination of Ad-E2F1 and AS-MDM2 significantly increases cell death in prostate cancer cells exposed to radiation and that this effect occurs in the presence or absence of AR and p53.
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Iijima K, Muranaka C, Kobayashi J, Sakamoto S, Komatsu K, Matsuura S, Kubota N, Tauchi H. NBS1 regulates a novel apoptotic pathway through Bax activation. DNA Repair (Amst) 2008; 7:1705-16. [PMID: 18644472 DOI: 10.1016/j.dnarep.2008.06.013] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2007] [Revised: 06/24/2008] [Accepted: 06/25/2008] [Indexed: 11/26/2022]
Abstract
DNA damage induced apoptosis, along with precise DNA damage repair, is a critical cellular function, and both of these functions are necessary for cancer prevention. The NBS1 protein is known to be a key regulator of DNA damage repair. It acts by forming a complex with Rad50/Mre11 and by activating ATM. We show here that NBS1 regulates a novel p53 independent apoptotic pathway in response to DNA damage. DNA damage induced apoptosis was significantly reduced in NBS1 deficient cells regardless of their p53 status. Experiments using a series of cell lines expressing mutant NBS1 proteins revealed that NBS1 is able to regulate the activation of Bax and Caspase-3 without the FHA, Mre11-binding, or the ATM-interacting domains, whereas the phosphorylation sites of NBS1 were essential for Bax activation. Expression of apoptosis-related transcription factors such as E2F1 and their downstream pro-apoptotic factors were not related to this apoptosis induction. Interestingly, NBS1 regulates a novel Bax activation pathway by disrupting the Ku70-Bax complex which is required for activation of the mitochondrial apoptotic pathway. This dissociation of the Ku70-Bax complex can be mediated by acetylation of Ku70, and NBS1 can function in this process through a protein-protein interaction with Ku70. Thus, NBS1 is a key protein involved in the prevention of carcinogenesis, not only through the precise repair of damaged DNA by homologous recombination (HR) but also by its role in the elimination of inappropriately repaired cells.
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Affiliation(s)
- Kenta Iijima
- Department of Environmental Sciences, Faculty of Science, Ibaraki University, Bunkyo 2-1-1, Mito, Ibaraki, Japan
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Monfared P, Winkeler A, Klein M, Li H, Klose A, Hoesel M, Waerzeggers Y, Korsching S, Jacobs AH. Noninvasive Assessment of E2F-1–Mediated Transcriptional RegulationIn vivo. Cancer Res 2008; 68:5932-40. [DOI: 10.1158/0008-5472.can-07-6373] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Gu M, Singh RP, Dhanalakshmi S, Mohan S, Agarwal R. Differential effect of silibinin on E2F transcription factors and associated biological events in chronically UVB-exposed skin versus tumors in SKH-1 hairless mice. Mol Cancer Ther 2006; 5:2121-9. [PMID: 16928834 DOI: 10.1158/1535-7163.mct-06-0052] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
UVB radiation-induced DNA damage in skin activates cellular pathways involved in DNA repair, cell cycle regulation, and apoptosis, important events that prevent conversion of damaged skin cells into cancer. We reported recently the efficacy of silibinin against photocarcinogenesis along with altered molecular events in tumors (Cancer Research, 64:6349-56, 2004). The molecular and biological events modulated by silibinin in chronically UVB-irradiated skin leading to cancer prevention, however, are not known. Herein, we describe effect of silibinin on skin 15 and 25 weeks after UVB exposure and compared them with molecular alterations in skin tumors. UVB decreased E2F1 but increased E2F2 and E2F3 protein levels in skin, and these were reversed by silibinin treatment. Silibinin-induced E2F1 was accompanied by an inhibition of apoptosis and decreases in p53 and cyclin-dependent kinase inhibitors. Silibinin-caused decrease in E2F2 and E2F3 was accompanied by reduced levels of cyclin-dependent kinases, cyclins, CDC25C, and mitogen-activated protein kinases and Akt signaling and inhibition of cell proliferation. In tumorigenesis protocols, topical or dietary silibinin significantly inhibited tumor appearance and growth. As opposed to UVB-exposed skin, UVB-induced tumors showed elevated levels of E2F1, but these were reduced in silibinin-treated tumors without any effect on E2F2 and E2F3. Contrary to the inhibition of apoptosis and p53 expression in UVB-exposed skin cells, silibinin increased these variables in tumors. These differential effects of silibinin on E2F1 versus E2F2 and E2F3 and their associated molecular alterations and biological effects in chronic UVB-exposed skin suggest their role in silibinin interference with photocarcinogenesis.
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Affiliation(s)
- Mallikarjuna Gu
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Colorado Health Sciences Center, 4200 East Ninth Avenue, Box C238, Denver, 80262, USA
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Abstract
More than 80 years ago, the renowned biochemist Otto Warburg described how cancer cells avidly consume glucose and produce lactic acid under aerobic conditions. Recent studies arguing that cancer cells benefit from this phenomenon, termed the Warburg effect, have renewed discussions about its exact role as cause, correlate, or facilitator of cancer. Molecular advances in this area may reveal tactics to exploit the cancer cell's "sweet tooth" for cancer therapy.
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Affiliation(s)
- Jung-whan Kim
- Division of Hematology, Department of Medicine, The Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, USA
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Knudsen ES, Knudsen KE. Retinoblastoma tumor suppressor: where cancer meets the cell cycle. Exp Biol Med (Maywood) 2006; 231:1271-81. [PMID: 16816134 DOI: 10.1177/153537020623100713] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
The retinoblastoma tumor suppressor gene, Rb, was the first tumor suppressor identified and plays a fundamental role in regulation of progression through the cell cycle. This review details facets of RB protein function in cell cycle control and focuses on specific questions that remain intensive areas of investigation.
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Affiliation(s)
- Erik S Knudsen
- Department of Cell Biology and University of Cincinnati Cancer Center, University of Cincinnati, Cincinnati, Ohio 45267-0521, USA.
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