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K AR, Arumugam S, Muninathan N, Baskar K, S D, D DR. P53 Gene as a Promising Biomarker and Potential Target for the Early Diagnosis of Reproductive Cancers. Cureus 2024; 16:e60125. [PMID: 38864057 PMCID: PMC11165294 DOI: 10.7759/cureus.60125] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2024] [Accepted: 05/10/2024] [Indexed: 06/13/2024] Open
Abstract
One of the crucial aspects of cancer research is diagnosis with specificity and accuracy. Early cancer detection mostly helps make appropriate decisions regarding treatment and metastasis. The well-studied transcription factor tumor suppressor protein p53 is essential for maintaining genetic integrity. p53 is a key tumor suppressor that recognizes the carcinogenic biological pathways and eradicates them by apoptosis. A wide range of carcinomas, especially gynecological such as ovarian, cervical, and endometrial cancers, frequently undergo TP53 gene mutations. This study evaluates the potential of the p53 gene as a biological marker for the diagnosis of reproductive system neoplasms. Immunohistochemistry of p53 is rapid, easy to accomplish, cost-effective, and preferred by pathologists as a surrogate for the analysis of TP53 mutation. Thus, this review lays a groundwork for future efforts to develop techniques using p53 for the early diagnosis of cancer.
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Affiliation(s)
- Aswathi R K
- Medical Biochemistry, Meenakshi Academy of Higher Education and Research, Chennai, IND
| | - Suresh Arumugam
- Central Research Laboratory, Meenakshi Medical College Hospital and Research Institute, Kanchipuram, IND
| | - Natrajan Muninathan
- Central Research Laboratory, Meenakshi Medical College Hospital and Research Institute, Kanchipuram, IND
| | - Kuppusamy Baskar
- Central Research Laboratory, Meenakshi Medical College Hospital and Research Institute, Kanchipuram, IND
| | - Deepthi S
- Research and Development, Meenakshi Academy of Higher Education and Research, Chennai, IND
| | - Dinesh Roy D
- Centre for Advanced Genetic Studies, Genetika, Thiruvananthapuram, IND
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Sesink A, Becerra M, Ruan JL, Leboucher S, Dubail M, Heinrich S, Jdey W, Petersson K, Fouillade C, Berthault N, Dutreix M, Girard PM. The AsiDNA™ decoy mimicking DSBs protects the normal tissue from radiation toxicity through a DNA-PK/p53/p21-dependent G1/S arrest. NAR Cancer 2024; 6:zcae011. [PMID: 38476631 PMCID: PMC10928987 DOI: 10.1093/narcan/zcae011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2023] [Revised: 02/01/2024] [Accepted: 02/27/2024] [Indexed: 03/14/2024] Open
Abstract
AsiDNA™, a cholesterol-coupled oligonucleotide mimicking double-stranded DNA breaks, was developed to sensitize tumour cells to radio- and chemotherapy. This drug acts as a decoy hijacking the DNA damage response. Previous studies have demonstrated that standalone AsiDNA™ administration is well tolerated with no additional adverse effects when combined with chemo- and/or radiotherapy. The lack of normal tissue complication encouraged further examination into the role of AsiDNA™ in normal cells. This research demonstrates the radioprotective properties of AsiDNA™. In vitro, AsiDNA™ induces a DNA-PK/p53/p21-dependent G1/S arrest in normal epithelial cells and fibroblasts that is absent in p53 deficient and proficient tumour cells. This cell cycle arrest improved survival after irradiation only in p53 proficient normal cells. Combined administration of AsiDNA™ with conventional radiotherapy in mouse models of late and early radiation toxicity resulted in decreased onset of lung fibrosis and increased intestinal crypt survival. Similar results were observed following FLASH radiotherapy in standalone or combined with AsiDNA™. Mechanisms comparable to those identified in vitro were detected both in vivo, in the intestine and ex vivo, in precision cut lung slices. Collectively, the results suggest that AsiDNA™ can partially protect healthy tissues from radiation toxicity by triggering a G1/S arrest in normal cells.
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Affiliation(s)
- Anouk Sesink
- Institut Curie, Université PSL, CNRS UMR3347, INSERM U1021, 91405 Orsay, France
- Université Paris-Saclay, CNRS UMR 3347, INSERM U1021, 91405 Orsay, France
| | - Margaux Becerra
- Institut Curie, Université PSL, CNRS UMR3347, INSERM U1021, 91405 Orsay, France
- Université Paris-Saclay, CNRS UMR 3347, INSERM U1021, 91405 Orsay, France
| | - Jia-Ling Ruan
- Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, Old Road Campus Research Building, Roosevelt Drive, Oxford, UK
| | - Sophie Leboucher
- Histology platform, Institut Curie, CNRS UMR3348, 91405 Orsay, France
| | - Maxime Dubail
- Institut Curie, Université PSL, CNRS UMR3347, INSERM U1021, 91405 Orsay, France
- Université Paris-Saclay, CNRS UMR 3347, INSERM U1021, 91405 Orsay, France
| | - Sophie Heinrich
- Institut Curie, Université PSL, CNRS UMR3347, INSERM U1021, 91405 Orsay, France
- Université Paris-Saclay, CNRS UMR 3347, INSERM U1021, 91405 Orsay, France
| | - Wael Jdey
- Valerio Therapeutics, 49 Bd du Général Martial Valin, 75015 Paris, France
| | - Kristoffer Petersson
- Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, Old Road Campus Research Building, Roosevelt Drive, Oxford, UK
- Radiation Physics, Department of Hematology, Oncology and Radiation Physics, Skåne University Hospital, Lund University, Lund, Sweden
| | - Charles Fouillade
- Institut Curie, Université PSL, CNRS UMR3347, INSERM U1021, 91405 Orsay, France
- Université Paris-Saclay, CNRS UMR 3347, INSERM U1021, 91405 Orsay, France
| | - Nathalie Berthault
- Institut Curie, Université PSL, CNRS UMR3347, INSERM U1021, 91405 Orsay, France
- Université Paris-Saclay, CNRS UMR 3347, INSERM U1021, 91405 Orsay, France
| | - Marie Dutreix
- Institut Curie, Université PSL, CNRS UMR3347, INSERM U1021, 91405 Orsay, France
- Université Paris-Saclay, CNRS UMR 3347, INSERM U1021, 91405 Orsay, France
| | - Pierre-Marie Girard
- Institut Curie, Université PSL, CNRS UMR3347, INSERM U1021, 91405 Orsay, France
- Université Paris-Saclay, CNRS UMR 3347, INSERM U1021, 91405 Orsay, France
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3
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Sharma Y, Mishra R, Kaur A, Bharadwaj M, Bala K. Effective seed cake extract of O. sanctum inducing the p53 dependent apoptotic pathway in oral cancer cells. Drug Dev Ind Pharm 2023; 49:667-679. [PMID: 37824711 DOI: 10.1080/03639045.2023.2270063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Accepted: 10/08/2023] [Indexed: 10/14/2023]
Abstract
OBJECTIVE Present study was to observe the therapeutic aspects of seed cake extracts of Ocimum sanctum against the oral cancer cell line with the activation of p53 apoptotic pathway. METHOD Seed cake extracts were characterized using GC-MS analysis. Cytotoxic activity was observed on KB cells and L929 cell through MTT assay and scratch assay. Antioxidant activity on KB cells were determined using enzymatic and non enzyme content in the treated cells. Chick chorioallantoic membrane (CAM) was established to check the presence of blood vessel formation and neuvasculature pattern in the treated fertilized eggs. DNA fragmentation and gene expression studies were also determined in the treated cells to check the upregulation of apoptotic pathways. RESULTS GC-MS analysis confirmed alkaloids, phenols, and many. The cytotoxic activity showed maximum antiproliferative potential with aqueous extract, whereas no cytotoxic effect was observed on L929 cells. The ethanolic and aqueous extract has shown a greater SI value. Scratch assay has signified that aqueous extract has a lower migration rate of KB cells. Aqueous extract showed maximum enzymatic activity and lower malondialdehyde content in cells treated with ethanolic extract. CAM model confirmed that eggs treated with aqueous extract has shown inhibition of vasculature pattern and dissolutions of blood vessels. DNA Fragmentation and Gene expression studies confirmed maximum fold in the KB cell treated with an aqueous extract of seed cake leading to activation of p53 dependent apoptotic pathway. CONCLUSION The potent therapeutic properties of seed cake extracts have been proven, and they can be used as herbal treatments to prevent oral cancer.
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Affiliation(s)
- Yash Sharma
- Therapeutics and Molecular Diagnostic Lab, Centre for Medical Biotechnology, Amity Institute of Biotechnology, Amity University, Noida, India
| | - Rupa Mishra
- Amity Institute of Molecular Medicine and Stem cell Research, Amity University Noida, Noida, India
| | - Amritpal Kaur
- Therapeutics and Molecular Diagnostic Lab, Centre for Medical Biotechnology, Amity Institute of Biotechnology, Amity University, Noida, India
| | | | - Kumud Bala
- Therapeutics and Molecular Diagnostic Lab, Centre for Medical Biotechnology, Amity Institute of Biotechnology, Amity University, Noida, India
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Choudhary HB, Mandlik SK, Mandlik DS. Role of p53 suppression in the pathogenesis of hepatocellular carcinoma. World J Gastrointest Pathophysiol 2023; 14:46-70. [PMID: 37304923 PMCID: PMC10251250 DOI: 10.4291/wjgp.v14.i3.46] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/27/2023] [Revised: 05/19/2023] [Accepted: 05/31/2023] [Indexed: 06/01/2023] Open
Abstract
In the world, hepatocellular carcinoma (HCC) is among the top 10 most prevalent malignancies. HCC formation has indeed been linked to numerous etiological factors, including alcohol usage, hepatitis viruses and liver cirrhosis. Among the most prevalent defects in a wide range of tumours, notably HCC, is the silencing of the p53 tumour suppressor gene. The control of the cell cycle and the preservation of gene function are both critically important functions of p53. In order to pinpoint the core mechanisms of HCC and find more efficient treatments, molecular research employing HCC tissues has been the main focus. Stimulated p53 triggers necessary reactions that achieve cell cycle arrest, genetic stability, DNA repair and the elimination of DNA-damaged cells’ responses to biological stressors (like oncogenes or DNA damage). To the contrary hand, the oncogene protein of the murine double minute 2 (MDM2) is a significant biological inhibitor of p53. MDM2 causes p53 protein degradation, which in turn adversely controls p53 function. Despite carrying wt-p53, the majority of HCCs show abnormalities in the p53-expressed apoptotic pathway. High p53 in-vivo expression might have two clinical impacts on HCC: (1) Increased levels of exogenous p53 protein cause tumour cells to undergo apoptosis by preventing cell growth through a number of biological pathways; and (2) Exogenous p53 makes HCC susceptible to various anticancer drugs. This review describes the functions and primary mechanisms of p53 in pathological mechanism, chemoresistance and therapeutic mechanisms of HCC.
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Affiliation(s)
- Heena B Choudhary
- Department of Pharmacology, BVDU, Poona College of Pharmacy, Pune 411038, Maharashtra, India
| | - Satish K Mandlik
- Department of Pharmaceutics, BVDU, Poona College of Pharmacy, Pune 411038, Maharashtra, India
| | - Deepa S Mandlik
- Department of Pharmacology, BVDU, Poona College of Pharmacy, Pune 411038, Maharashtra, India
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Obaidi I, Blanco Fernández A, McMorrow T. Curcumin Sensitises Cancerous Kidney Cells to TRAIL Induced Apoptosis via Let-7C Mediated Deregulation of Cell Cycle Proteins and Cellular Metabolism. Int J Mol Sci 2022; 23:ijms23179569. [PMID: 36076967 PMCID: PMC9455736 DOI: 10.3390/ijms23179569] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2022] [Revised: 08/17/2022] [Accepted: 08/17/2022] [Indexed: 12/31/2022] Open
Abstract
Targeted therapies are the most attractive options in the treatment of different tumours, including kidney cancers. Such therapies have entered a golden era due to advancements in research, breakthroughs in scientific knowledge, and a better understanding of cancer therapy mechanisms, which significantly improve the survival rates and life expectancy of patients. The use of tumour necrosis factor (TNF)-related apoptosis inducing ligand (TRAIL) as an anticancer therapy has attracted the attention of the scientific community and created great excitement due to its selectivity in targeting cancerous cells with no toxic impacts on normal tissues. However, clinical studies disappointingly showed the emergence of resistance against TRAIL. This study aimed to employ curcumin to sensitise TRAIL-resistant kidney cancerous ACHN cells, as well as to gain insight into the molecular mechanisms of TRAIL sensitization. Curcumin deregulated the expression of apoptosis-regulating micro Ribonucleic Acid (miRNAs), most notably, let-7C. Transfecting ACHN cells with a let-7C antagomir significantly increased the expression of several cell cycle protein, namely beta (β)-catenin, cyclin dependent kinase (CDK)1/2/4/6 and cyclin B/D. Further, it overexpressed the expression of the two key glycolysis regulating proteins including hypoxia-inducible factor 1-alpha (HIF-1α) and pyruvate dehydrogenase kinase 1 (PDK1). Curcumin also suppressed the expression of the overexpressed proteins when added to the antagomir transfected cells. Overall, curcumin targeted ACHN cell cycle and cellular metabolism by promoting the differential expression of let-7C. To the best of our knowledge, this is the first study to mechanistically report the cancer chemosensitisation potential of curcumin in kidney cancer cells via induction of let-7C.
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Affiliation(s)
- Ismael Obaidi
- NatPro Centre for Natural Product Research, School of Pharmacy and Pharmaceutical Sciences, Trinity College Dublin, D02 W272 Dublin, Ireland
- College of Pharmacy, University of Babylon, Babylon 51002, Iraq
- Correspondence: (I.O.); (T.M.); Tel.: +353-8-6064-2626 (I.O.); +353-1-716-2317 (ext. 6819) (T.M.)
| | - Alfonso Blanco Fernández
- Flow Cytometry Core Technology, Conway Institute of Biomolecular and Biomedical Research, University College Dublin, D04 V1W8 Dublin, Ireland
| | - Tara McMorrow
- Centre for Toxicology, School of Biomedical and Biomolecular Sciences, Conway Institute, University College Dublin, D04 V1W8 Dublin, Ireland
- Correspondence: (I.O.); (T.M.); Tel.: +353-8-6064-2626 (I.O.); +353-1-716-2317 (ext. 6819) (T.M.)
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6
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Ljungman M. Transcription and genome integrity. DNA Repair (Amst) 2022; 118:103373. [PMID: 35914488 DOI: 10.1016/j.dnarep.2022.103373] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2022] [Revised: 07/16/2022] [Accepted: 07/17/2022] [Indexed: 11/03/2022]
Abstract
Transcription can cause genome instability by promoting R-loop formation but also act as a mutation-suppressing machinery by sensing of DNA lesions leading to the activation of DNA damage signaling and transcription-coupled repair. Recovery of RNA synthesis following the resolution of repair of transcription-blocking lesions is critical to avoid apoptosis and several new factors involved in this process have recently been identified. Some DNA repair proteins are recruited to initiating RNA polymerases and this may expediate the recruitment of other factors that participate in the repair of transcription-blocking DNA lesions. Recent studies have shown that transcription of protein-coding genes does not always give rise to spliced transcripts, opening the possibility that cells may use the transcription machinery in a splicing-uncoupled manner for other purposes including surveillance of the transcribed genome.
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Affiliation(s)
- Mats Ljungman
- Departments of Radiation Oncology and Environmental Health Sciences, Rogel Cancer Center and Center for RNA Biomedicine, University of Michigan, Ann Arbor, MI, USA.
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7
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Maurizy C, Abeza C, Lemmers B, Gabola M, Longobardi C, Pinet V, Ferrand M, Paul C, Bremond J, Langa F, Gerbe F, Jay P, Verheggen C, Tinari N, Helmlinger D, Lattanzio R, Bertrand E, Hahne M, Pradet-Balade B. The HSP90/R2TP assembly chaperone promotes cell proliferation in the intestinal epithelium. Nat Commun 2021; 12:4810. [PMID: 34376666 PMCID: PMC8355188 DOI: 10.1038/s41467-021-24792-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2020] [Accepted: 07/05/2021] [Indexed: 02/07/2023] Open
Abstract
The R2TP chaperone cooperates with HSP90 to integrate newly synthesized proteins into multi-subunit complexes, yet its role in tissue homeostasis is unknown. Here, we generated conditional, inducible knock-out mice for Rpap3 to inactivate this core component of R2TP in the intestinal epithelium. In adult mice, Rpap3 invalidation caused destruction of the small intestinal epithelium and death within 10 days. Levels of R2TP substrates decreased, with strong effects on mTOR, ATM and ATR. Proliferative stem cells and progenitors deficient for Rpap3 failed to import RNA polymerase II into the nucleus and they induced p53, cell cycle arrest and apoptosis. Post-mitotic, differentiated cells did not display these alterations, suggesting that R2TP clients are preferentially built in actively proliferating cells. In addition, high RPAP3 levels in colorectal tumors from patients correlate with bad prognosis. Here, we show that, in the intestine, the R2TP chaperone plays essential roles in normal and tumoral proliferation.
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Affiliation(s)
- Chloé Maurizy
- IGMM, Univ Montpellier, CNRS, Montpellier, France
- Equipe labélisée Ligue Nationale Contre le Cancer, Paris, France
| | - Claire Abeza
- IGMM, Univ Montpellier, CNRS, Montpellier, France
- Equipe labélisée Ligue Nationale Contre le Cancer, Paris, France
| | | | | | | | | | | | | | | | - Francina Langa
- Centre d'Ingénierie Génétique Murine, Institut Pasteur, Paris, France
| | - François Gerbe
- Equipe labélisée Ligue Nationale Contre le Cancer, Paris, France
- IGF, Univ Montpellier, CNRS, INSERM, Montpellier, France
| | - Philippe Jay
- Equipe labélisée Ligue Nationale Contre le Cancer, Paris, France
- IGF, Univ Montpellier, CNRS, INSERM, Montpellier, France
| | - Céline Verheggen
- IGMM, Univ Montpellier, CNRS, Montpellier, France
- Equipe labélisée Ligue Nationale Contre le Cancer, Paris, France
- IGH, Univ Montpellier, CNRS, Montpellier, France
| | - Nicola Tinari
- Department of Medical, Oral and Biotechnological Sciences, Center for Advanced Studies and Technology (CAST), 'G. d'Annunzio' University of Chieti-Pescara, Chieti, Italy
| | | | - Rossano Lattanzio
- Department of Innovative Technologies in Medicine & Dentistry, Center for Advanced Studies and Technology (CAST), 'G. d'Annunzio' University of Chieti-Pescara, Chieti, Italy
| | - Edouard Bertrand
- IGMM, Univ Montpellier, CNRS, Montpellier, France.
- Equipe labélisée Ligue Nationale Contre le Cancer, Paris, France.
- IGH, Univ Montpellier, CNRS, Montpellier, France.
| | | | - Bérengère Pradet-Balade
- Equipe labélisée Ligue Nationale Contre le Cancer, Paris, France.
- CRBM, Univ Montpellier, CNRS, Montpellier, France.
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de la Torre P, Fernández-de la Torre M, Flores AI. Premature senescence of placental decidua cells as a possible cause of miscarriage produced by mycophenolic acid. J Biomed Sci 2021; 28:3. [PMID: 33397374 PMCID: PMC7780668 DOI: 10.1186/s12929-020-00704-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Accepted: 12/23/2020] [Indexed: 02/08/2023] Open
Abstract
BACKGROUND Successful pregnancy is supported by a healthy maternal-fetal interface (i.e., the decidual tissues) which holds the conceptus and safeguards it against stressors from the beginning of pregnancy. Any disturbance of this interface can presumably lead to the loss of pregnancy. The use of the immunosuppressive drug mycophenolic acid (MPA) should be discontinued in pregnancy given its abortive and embryotoxic effects. Direct teratogenic effects have been observed in mammalian embryos cultured in MPA, but the underlying mechanisms of abortion by MPA are less understood. METHODS Decidual stromal cells isolated from human placentas are cultured in the presence of clinically relevant doses of MPA. Data regarding the effects of MPA on the proliferation and viability of decidua cultures are first analysed and then, molecular pathways contributing to these effects are unravelled. RESULTS MPA treatment of decidual stromal cells results in loss of proliferation capacity and a decrease in the viability of decidua cultures. The molecular pathways involved in the effects of MPA on decidual stromal cells are a reduction in pre-rRNA synthesis and subsequent disruption of the nucleolus. The nucleolar stress stabilizes p53, which in turn, leads to a p21-mediated cell cycle arrest in late S and G2 phases, preventing the progression of the decidua cells into the mitosis. Furthermore, MPA does not induce apoptosis but activate mechanisms of autophagy and senescence in decidual stromal cells. CONCLUSION The irreversible growth arrest of decidua cells, whose role in the maintenance of the pregnancy microenvironment is known, may be one cause of miscarriage in MPA treated pregnant women.
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Affiliation(s)
- Paz de la Torre
- Grupo de Medicina Regenerativa, Instituto de Investigación Sanitaria Hospital 12 de Octubre (imas12), Avda. Cordoba s/n 28041, Madrid, Spain
| | - Miguel Fernández-de la Torre
- Grupo de Enfermedades Raras, Mitocondriales y Neuromusculares, Instituto de Investigación Sanitaria Hospital 12 de Octubre (imas12), Avda. Cordoba s/n 28041, Madrid, Spain
| | - Ana I Flores
- Grupo de Medicina Regenerativa, Instituto de Investigación Sanitaria Hospital 12 de Octubre (imas12), Avda. Cordoba s/n 28041, Madrid, Spain.
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Uddin MA, Barabutis N. P53 in the impaired lungs. DNA Repair (Amst) 2020; 95:102952. [PMID: 32846356 PMCID: PMC7437512 DOI: 10.1016/j.dnarep.2020.102952] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2020] [Accepted: 08/13/2020] [Indexed: 12/12/2022]
Abstract
Our laboratory is focused on investigating the supportive role of P53 towards the maintenance of lung homeostasis. Acute lung injury, acute respiratory distress syndrome, chronic obstructive pulmonary disease, pulmonary fibrosis, bronchial asthma, pulmonary arterial hypertension, pneumonia and tuberculosis are respiratory pathologies, associated with dysfunctions of this endothelium defender (P53). Herein we review the evolving role of P53 towards the aforementioned inflammatory disorders, to potentially reveal new therapeutic possibilities in pulmonary disease.
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Affiliation(s)
- Mohammad A Uddin
- School of Basic Pharmaceutical and Toxicological Sciences, College of Pharmacy, University of Louisiana Monroe, Monroe, Louisiana 71201, USA
| | - Nektarios Barabutis
- School of Basic Pharmaceutical and Toxicological Sciences, College of Pharmacy, University of Louisiana Monroe, Monroe, Louisiana 71201, USA.
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Abstract
Xiakemycin A (XKA), a new antibiotic in the pyranonaphthoquinone family, shows antitumor activity. However, the type of cell death induced by XKA remains elusive. In this study, we aim to investigate the type of death induced by XKA in hepatic cancer.The apoptotic features, such as chromatic agglutination, reactive oxygen species generation and membrane potential of mitochondria, in HepG2 cells treated by XKA were measured by Hoechst 33342 staining and flow cytometry. Apoptosis of HepG2 cells treated with XKA was determined by Annexin V-FITC/propidium iodide double staining and Western blot analysis, respectively.XKA had a significant dose-dependent elevation of chromatic agglutination, reactive oxygen species generation, Annexin V and propidium iodide staining, decrease of membrane potential. Meanwhile, in apoptotic HepG2 cells induced by XKA, robust increment was noticed in p53 expression, cleavage of PARP, caspase-3, and caspase-9.XKA showed potent inhibitory effects on the proliferation of HepG2 cells. Such phenomenon may be related to activation of the apoptotic pathway.
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Affiliation(s)
- Chuan Chen
- Faculty of Basic Medical Sciences, Jiujiang University, Jiujiang
| | - Zhu Han
- Department of Biological and Chemical Engineering, Jingdezhen University, Jingdezhen
| | - Minjie Yang
- Faculty of Nursing, Jiujiang University, Jiujiang
| | - Zhongke Jiang
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, and Chinese Academy of Medical Sciences
| | - Xiuyuan Ou
- Institute of Pathogen Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
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11
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Berniyanti T, Palupi R, Kriswandini IL, Bramantoro T, Putri IL. Suitability of MDA, 8-OHdG and wild-type p53 as genotoxic biomarkers in metal (Co, Ni and Cr) exposed dental technicians: a cross-sectional study. BMC Oral Health 2020; 20:65. [PMID: 32138726 PMCID: PMC7059730 DOI: 10.1186/s12903-020-1049-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2018] [Accepted: 02/13/2020] [Indexed: 02/08/2023] Open
Abstract
BACKGROUND High concentrations of Co, Ni, and Cr in the blood serum of dental technicians are strongly associated with free radical formation. It has highly reactive properties that can cause further oxidation of molecule in the vicinity. PURPOSE This study intended to investigate whether the Dental Technician occupational exposure of Co, Ni and Cr, could contribute to the high incidence of cancer. METHODS This was a cross-sectional study to dental technicians, performed after acccepting ethical clearance. Blood was sampled in 3 examinations for Co, Ni, Cr using Atomic Absorbance Spectrophotometry (AAS), MDA was examined with TBARS test, also 8 OHdG and wildtype p53 proteins determined by ELISA method. RESULTS Comparative statistical analysis, showing a significant difference (p < 0.05) between levels of Co, Ni, and Cr in exposed groups to the control group. But, not all variables was proven to be positively correlated, only with Cr, and Co, and negatively correlated with wild-type p53. CONCLUSION MDA,8-OHdG and wildtype p53 can be used as genotoxic biomarkers in the metal exposed group, since they can accurately reflect the degree of Oxidative damage.
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Affiliation(s)
- Titiek Berniyanti
- Department of Dental Public Health, Faculty of Dental Medicine, Universitas Airlangga, Surabaya, Indonesia.
| | - Retno Palupi
- Department of Dental Public Health, Faculty of Dental Medicine, Universitas Airlangga, Surabaya, Indonesia
| | - Indah L Kriswandini
- Department of Biology Oral, Faculty of Dental Medicine, Universitas Airlangga, Surabaya, Indonesia
| | - Taufan Bramantoro
- Department of Dental Public Health, Faculty of Dental Medicine, Universitas Airlangga, Surabaya, Indonesia
| | - Indira L Putri
- Department of Dental Public Health, Faculty of Dental Medicine, Universitas Airlangga, Surabaya, Indonesia
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12
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Mirza-Aghazadeh-Attari M, Ostadian C, Saei AA, Mihanfar A, Darband SG, Sadighparvar S, Kaviani M, Samadi Kafil H, Yousefi B, Majidinia M. DNA damage response and repair in ovarian cancer: Potential targets for therapeutic strategies. DNA Repair (Amst) 2019; 80:59-84. [PMID: 31279973 DOI: 10.1016/j.dnarep.2019.06.005] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2018] [Revised: 06/01/2019] [Accepted: 06/15/2019] [Indexed: 12/24/2022]
Abstract
Ovarian cancer is among the most lethal gynecologic malignancies with a poor survival prognosis. The current therapeutic strategies involve surgery and chemotherapy. Research is now focused on novel agents especially those targeting DNA damage response (DDR) pathways. Understanding the DDR process in ovarian cancer necessitates having a detailed knowledge on a series of signaling mediators at the cellular and molecular levels. The complexity of the DDR process in ovarian cancer and how this process works in metastatic conditions is comprehensively reviewed. For evaluating the efficacy of therapeutic agents targeting DNA damage in ovarian cancer, we will discuss the components of this system including DDR sensors, DDR transducers, DDR mediators, and DDR effectors. The constituent pathways include DNA repair machinery, cell cycle checkpoints, and apoptotic pathways. We also will assess the potential of active mediators involved in the DDR process such as therapeutic and prognostic candidates that may facilitate future studies.
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Affiliation(s)
- Mohammad Mirza-Aghazadeh-Attari
- Aging Research Institute, Tabriz University of Medical Sciences, Tabriz, Iran; Student Research Committee, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Caspian Ostadian
- Department of Biology, Faculty of Science, Urmia University, Urmia, Iran
| | - Amir Ata Saei
- Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm, 171 77, Sweden
| | - Ainaz Mihanfar
- Department of Biochemistry, Faculty of Medicine, Urmia University of Medical Sciences, Urmia, Iran
| | - Saber Ghazizadeh Darband
- Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm, 171 77, Sweden; Student Research Committee, Urmia University of Medical Sciences, Urmia, Iran
| | - Shirin Sadighparvar
- Neurophysiology Research Center, Urmia University of Medical Sciences, Urmia, Iran
| | - Mojtaba Kaviani
- School of Nutrition and Dietetics, Acadia University, Wolfville, Nova Scotia, Canada
| | | | - Bahman Yousefi
- Molecular MedicineResearch Center, Tabriz University of Medical Sciences, Tabriz, Iran; Department of Clinical Biochemistry and Laboratory Medicine, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran.
| | - Maryam Majidinia
- Solid Tumor Research Center, Urmia University of Medical Sciences, Urmia, Iran.
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13
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Hicks SD, Miller MW. Ethanol-induced DNA repair in neural stem cells is transforming growth factor β1-dependent. Exp Neurol 2019; 317:214-225. [PMID: 30853389 DOI: 10.1016/j.expneurol.2019.02.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2018] [Revised: 12/13/2018] [Accepted: 02/07/2019] [Indexed: 12/18/2022]
Abstract
Following neurotoxic damage, cells repair their DNA, and survive or undergo apoptosis. This study tests the hypothesis that ethanol induces a DNA damage response (DDR) in neural stem cells (NSCs) that promotes excision repair (ER) and this repair is influenced by the growth factor environment. Non-immortalized NSCs treated with fibroblast growth factor 2 or transforming growth factor (TGF) β1 were exposed to ethanol. Ethanol increased total DNA damage, reactive oxygen species, and oxidized DNA bases. TGFβ1 potentiated these toxic effects. Transcriptional analyses of cultured NSCs revealed ethanol-induced increases in transcripts related to the DDR (e.g., Hus1 and p53), base ER (e.g., Mutyh and Nthl1), and nucleotide ER (e.g., Xpc), particularly in the presence of TGFβ1. Expression and activity of ER proteins were affected by ethanol. Similar changes occurred in proliferating cells of ethanol-treated mouse fetuses. Ethanol-induced DNA repair in NSCs depends on the ambient growth factors. Gene products for DNA repair in stem cells are among the first biomarkers identifying fetal alcohol-induced damage.
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Affiliation(s)
- Steven D Hicks
- Department of Neuroscience and Physiology, State University of New York - Upstate Medical University, Syracuse, NY 13210, USA; Developmental Exposure Alcohol Research Center, Binghamton NY 13902, Cortland NY 13045, and Syracuse, NY 13210, USA
| | - Michael W Miller
- Department of Neuroscience and Physiology, State University of New York - Upstate Medical University, Syracuse, NY 13210, USA; Developmental Exposure Alcohol Research Center, Binghamton NY 13902, Cortland NY 13045, and Syracuse, NY 13210, USA; Department of Anatomy, Touro College of Osteopathic Medicine, Middletown, NY 10940, USA; Research Service, Veterans Affairs Medical Center, Syracuse, NY 13210, USA.
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14
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Ling GQ, Li XF, Lei XH, Wang ZY, Ma DY, Wang YN, Ye W. c‑Jun N‑terminal kinase inhibition attenuates early brain injury induced neuronal apoptosis via decreasing p53 phosphorylation and mitochondrial apoptotic pathway activation in subarachnoid hemorrhage rats. Mol Med Rep 2019; 19:327-337. [PMID: 30431087 PMCID: PMC6297759 DOI: 10.3892/mmr.2018.9640] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2018] [Accepted: 10/01/2018] [Indexed: 12/14/2022] Open
Abstract
Early brain injury (EBI)‑induced neuronal apoptosis is primarily responsible for the subsequent complications of aneurysmal subarachnoid hemorrhage (aSAH), which may increase the risk of mortality in patients with aSAH. c‑Jun N‑terminal kinase (JNK) has been demonstrated to be a promoter of EBI‑induced cell apoptosis, although the mechanism has yet to be fully elucidated. The present study aimed to explore whether the role of JNK1 is associated with tumor protein p53 (p53), which is one of the most important factor that triggers cell apoptosis. JNK1 expression was downregulated via in vivo small interfering RNA transfection in an aSAH rat model in order to assess differences in the behavior, survival times, morphology and genetics of the experimental animals. The results revealed that JNK1 inhibition improved the neurological scores and survival times of SAH rats by interrupting cascaded neuronal apoptosis. The interruption of EBI‑induced neuronal apoptosis may originate from a decrease in the level of p53 phosphorylation and deactivation of the downstream mitochondrial apoptotic pathway. Taken together, these results suggest that JNK1 may be a promising target for improving the prognosis of patients with aSAH.
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Affiliation(s)
- Geng-Qiang Ling
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150086, P.R. China
- Department of Neurosurgery, The Seventh Affiliated Hospital of Sun Yat-sen University, Shenzhen, Guangdong 518107, P.R. China
| | - Xian-Feng Li
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150086, P.R. China
| | - Xu-Hui Lei
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150086, P.R. China
| | - Zhen-Yu Wang
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150086, P.R. China
| | - Dong-Ying Ma
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150086, P.R. China
| | - Yue-Na Wang
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150086, P.R. China
| | - Wei Ye
- Department of Neurosurgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150086, P.R. China
- Neuroscience Institute, Heilongjiang Academy of Medical Sciences, Harbin, Heilongjiang 150086, P.R. China
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15
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Derenzini E, Rossi A, Treré D. Treating hematological malignancies with drugs inhibiting ribosome biogenesis: when and why. J Hematol Oncol 2018; 11:75. [PMID: 29855342 PMCID: PMC5984324 DOI: 10.1186/s13045-018-0609-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2018] [Accepted: 04/26/2018] [Indexed: 01/05/2023] Open
Abstract
It is well known that chemotherapy can cure only some cancers in advanced stage, mostly those with an intact p53 pathway. Hematological cancers such as lymphoma and certain forms of leukemia are paradigmatic examples of such scenario. Recent evidence indicates that the efficacy of many of the alkylating and intercalating agents, antimetabolites, topoisomerase, and kinase inhibitors used in cancer therapy is largely due to p53 stabilization and activation consequent to the inhibition of ribosome biogenesis. In this context, innovative drugs specifically hindering ribosome biogenesis showed preclinical activity and are currently in early clinical development in hematological malignancies. The mechanism of p53 stabilization after ribosome biogenesis inhibition is a multistep process, depending on specific factors that can be altered in tumor cells, which can affect the antitumor efficacy of ribosome biogenesis inhibitors (RiBi). In the present review, the basic mechanisms underlying the anticancer activity of RiBi are discussed based on the evidence deriving from available preclinical and clinical studies, with the purpose of defining when and why the treatment with drugs inhibiting ribosomal biogenesis could be highly effective in hematological malignancies.
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Affiliation(s)
- Enrico Derenzini
- European Institute of Oncology, Via Ripamonti 435, 20141, Milan, Italy.
| | - Alessandra Rossi
- European Institute of Oncology, Via Ripamonti 435, 20141, Milan, Italy
| | - Davide Treré
- DIMES, Università di Bologna, Via Massarenti 9, Bologna, Italy.
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16
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Covino DA, Gauzzi MC, Fantuzzi L. Understanding the regulation of APOBEC3 expression: Current evidence and much to learn. J Leukoc Biol 2017; 103:433-444. [DOI: 10.1002/jlb.2mr0717-310r] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2017] [Revised: 09/28/2017] [Accepted: 10/19/2017] [Indexed: 12/13/2022] Open
Affiliation(s)
| | | | - Laura Fantuzzi
- National Center for Global Health; Istituto Superiore di Sanità; Rome Italy
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17
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Chmara J, Browning JWL, Atkins H, Sabloff M, McKay BC. Rapid Decrease in KRT14 and TP53 mRNA Expression in the Buccal Mucosa of Patients Receiving Total-Body Irradiation for Allogeneic Stem Cell Transplantation. Radiat Res 2017; 189:213-218. [PMID: 29232178 DOI: 10.1667/rr14897.1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
The only curative treatment option for relapsed patients with acute myeloid leukemia (AML) is allogeneic stem cell transplantation. Depletion of hematopoietic stem cells and leukemic blast cells is achieved through the systemic administration of DNA damaging agents, including total-body irradiation (TBI) prior to transplantation. Since other tissues are radiosensitive, the identification of biomarkers could facilitate the management of additional toxicities. Buccal keratinocytes are readily accessible and could provide a source of cells for RNA analysis. In this study, we obtained miRNAs and mRNAs from daily buccal swabs collected from patients undergoing allogeneic stem cell transplantation. Unexpectedly, there was no prominent p53-induced mRNA or miRNA response in these samples, despite the fact that the p53 pathway is a well-characterized radiation-inducible response. Instead, the expression of mRNAs encoding p53 and cytokeratin 14 (TP53 and KRT14, respectively) decreased precipitously within hours of the first radiation treatment. These patients went on to develop oral mucositis, however, it is unclear whether TP53 and/or KRT14 expression are predictive of this adverse event. Larger scale analysis of buccal epithelial samples from patients undergoing allogeneic stem cell transplantation appears to be warranted.
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Affiliation(s)
| | | | - H Atkins
- c Division of Hematology, Department of Medicine, University of Ottawa, Ottawa, Canada; and.,d Ottawa Hospital Research Institute, Ottawa, Canada
| | - M Sabloff
- c Division of Hematology, Department of Medicine, University of Ottawa, Ottawa, Canada; and.,d Ottawa Hospital Research Institute, Ottawa, Canada
| | - B C McKay
- a Department of Biology and.,b Institute of Biochemistry, Carleton University, Ottawa, Canada
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18
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Christmann M, Kaina B. Epigenetic regulation of DNA repair genes and implications for tumor therapy. MUTATION RESEARCH-REVIEWS IN MUTATION RESEARCH 2017; 780:15-28. [PMID: 31395346 DOI: 10.1016/j.mrrev.2017.10.001] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 05/29/2017] [Revised: 10/05/2017] [Accepted: 10/06/2017] [Indexed: 12/31/2022]
Abstract
DNA repair represents the first barrier against genotoxic stress causing metabolic changes, inflammation and cancer. Besides its role in preventing cancer, DNA repair needs also to be considered during cancer treatment with radiation and DNA damaging drugs as it impacts therapy outcome. The DNA repair capacity is mainly governed by the expression level of repair genes. Alterations in the expression of repair genes can occur due to mutations in their coding or promoter region, changes in the expression of transcription factors activating or repressing these genes, and/or epigenetic factors changing histone modifications and CpG promoter methylation or demethylation levels. In this review we provide an overview on the epigenetic regulation of DNA repair genes. We summarize the mechanisms underlying CpG methylation and demethylation, with de novo methyltransferases and DNA repair involved in gain and loss of CpG methylation, respectively. We discuss the role of components of the DNA damage response, p53, PARP-1 and GADD45a on the regulation of the DNA (cytosine-5)-methyltransferase DNMT1, the key enzyme responsible for gene silencing. We stress the relevance of epigenetic silencing of DNA repair genes for tumor formation and tumor therapy. A paradigmatic example is provided by the DNA repair protein O6-methylguanine-DNA methyltransferase (MGMT), which is silenced in up to 40% of various cancers through CpG promoter methylation. The CpG methylation status of the MGMT promoter strongly correlates with clinical outcome and, therefore, is used as prognostic marker during glioblastoma therapy. Mismatch repair genes are also subject of epigenetic silencing, which was shown to correlate with colorectal cancer formation. For many other repair genes shown to be epigenetically regulated the clinical outcome is not yet clear. We also address the question of whether genotoxic stress itself can lead to epigenetic alterations of genes encoding proteins involved in the defense against genotoxic stress.
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Affiliation(s)
- Markus Christmann
- Department of Toxicology, University of Mainz, Obere Zahlbacher Str. 67, D-55131 Mainz, Germany.
| | - Bernd Kaina
- Department of Toxicology, University of Mainz, Obere Zahlbacher Str. 67, D-55131 Mainz, Germany.
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19
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Feng FY, Zhang Y, Kothari V, Evans JR, Jackson WC, Chen W, Johnson SB, Luczak C, Wang S, Hamstra DA. MDM2 Inhibition Sensitizes Prostate Cancer Cells to Androgen Ablation and Radiotherapy in a p53-Dependent Manner. Neoplasia 2017; 18:213-22. [PMID: 27108384 PMCID: PMC4840291 DOI: 10.1016/j.neo.2016.01.006] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2016] [Accepted: 01/27/2016] [Indexed: 11/23/2022]
Abstract
PURPOSE: Increased murine double minute 2 (MDM2) expression, independent of p53 status, is associated with increased cancer-specific mortality for men with prostate cancer treated with radiotherapy. We assessed MI-219, a small molecule inhibitor of MDM2 with improved pharmacokinetics over nutlin-3, for sensitization of prostate cancer cells to radiotherapy and androgen deprivation therapy, a standard treatment option for men with high-risk prostate cancer. EXPERIMENTAL DESIGN: The effect of MDM2 inhibition by MI-219 was assessed in vitro and in vivo with mouse xenograft models across multiple prostate cancer cell lines containing varying p53 functional status. RESULTS: MDM2 inhibition by MI-219 resulted in dose- and time-dependent p53 activation and decreased clonogenic cell survival after radiation in a p53-dependent manner. Mechanistically, radiosensitization following inhibition of MDM2 was largely the result of p53-dependent increases in apoptosis and DNA damage as evidenced by Annexin V flow cytometry and γ-H2AX foci immunofluorescence. Similarly, treatment with MI-219 enhanced response to antiandrogen therapy via a p53-dependent increase in apoptotic cell death. Lastly, triple therapy with radiation, androgen deprivation therapy, and MI-219 decreased xenograft tumor growth compared with any single- or double-agent treatment. CONCLUSION: MDM2 inhibition with MI-219 results in p53-dependent sensitization of prostate cancer cells to radiation, antiandrogen therapy, and the combination. These findings support MDM2 small molecule inhibitor therapy as a therapy intensification strategy to improve clinical outcomes in high-risk localized prostate cancer. TRANSLATIONAL RELEVANCE: The combination of radiotherapy and androgen deprivation therapy is a standard treatment option for men with high-risk prostate cancer. Despite improvements in outcomes when androgen deprivation therapy is added to radiation, men with high-risk prostate cancer have significant risk for disease recurrence, progression, and even death within the first 10 years following treatment. We demonstrate that treatment with MI-219 (an inhibitor of MDM2) results in prostate cancer cell sensitization to radiation and androgen deprivation therapy in vitro and in vivo. Triple therapy with MI-219, radiation, and androgen deprivation therapy dramatically decreased tumor growth compared with any single- or double-agent therapy. These findings provide evidence that inhibition of MDM2 is a viable means by which to enhance the efficacy of both radiation and androgen deprivation therapy and thereby improve outcomes in the treatment of prostate cancer. As such, further investigation is warranted to translate these findings to the clinical setting.
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Affiliation(s)
- Felix Y Feng
- Departments of Radiation Oncology, Urology, and Medicine, University of California at San Francisco, San Francisco, CA; Helen Diller Family Comprehensive Cancer Center; Department of Radiation Oncology, University of Michigan, Ann Arbor, MI.
| | - Yu Zhang
- Department of Radiation Oncology, University of Michigan, Ann Arbor, MI
| | - Vishal Kothari
- Department of Radiation Oncology, University of Michigan, Ann Arbor, MI
| | - Joseph R Evans
- Department of Radiation Oncology, University of Michigan, Ann Arbor, MI
| | - William C Jackson
- Department of Radiation Oncology, University of Michigan, Ann Arbor, MI
| | - Wei Chen
- Department of Radiation Oncology, University of Michigan, Ann Arbor, MI
| | - Skyler B Johnson
- Department of Radiation Oncology, University of Michigan, Ann Arbor, MI
| | - Connor Luczak
- Department of Radiation Oncology, University of Michigan, Ann Arbor, MI
| | - Shaomeng Wang
- Comprehensive Cancer Center, University of Michigan, Ann Arbor, MI, USA; Departments of Internal Medicine, Pharmacology, and Medicinal Chemistry, University of Michigan, Ann Arbor, MI, USA
| | - Daniel A Hamstra
- Department of Radiation Oncology, University of Michigan, Ann Arbor, MI; Comprehensive Cancer Center, University of Michigan, Ann Arbor, MI, USA.
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20
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Significance of Wild-Type p53 Signaling in Suppressing Apoptosis in Response to Chemical Genotoxic Agents: Impact on Chemotherapy Outcome. Int J Mol Sci 2017; 18:ijms18050928. [PMID: 28452953 PMCID: PMC5454841 DOI: 10.3390/ijms18050928] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2017] [Revised: 04/18/2017] [Accepted: 04/25/2017] [Indexed: 12/17/2022] Open
Abstract
Our genomes are subject to potentially deleterious alterations resulting from endogenous sources (e.g., cellular metabolism, routine errors in DNA replication and recombination), exogenous sources (e.g., radiation, chemical agents), and medical diagnostic and treatment applications. Genome integrity and cellular homeostasis are maintained through an intricate network of pathways that serve to recognize the DNA damage, activate cell cycle checkpoints and facilitate DNA repair, or eliminate highly injured cells from the proliferating population. The wild-type p53 tumor suppressor and its downstream effector p21WAF1 (p21) are key regulators of these responses. Although extensively studied for its ability to control cell cycle progression, p21 has emerged as a multifunctional protein capable of downregulating p53, suppressing apoptosis, and orchestrating prolonged growth arrest through stress-induced premature senescence. Studies with solid tumors and solid tumor-derived cell lines have revealed that such growth-arrested cancer cells remain viable, secrete growth-promoting factors, and can give rise to progeny with stem-cell-like properties. This article provides an overview of the mechanisms by which p53 signaling suppresses apoptosis following genotoxic stress, facilitating repair of genomic injury under physiological conditions but having the potential to promote tumor regrowth in response to cancer chemotherapy.
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21
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O'Brien R, Marignol L. The Notch-1 receptor in prostate tumorigenesis. Cancer Treat Rev 2017; 56:36-46. [PMID: 28457880 DOI: 10.1016/j.ctrv.2017.04.003] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2017] [Revised: 04/04/2017] [Accepted: 04/05/2017] [Indexed: 12/12/2022]
Abstract
The Notch signalling pathway plays a fundamental role in tissue development due to its involvement in cell fate determination and postnatal tissue differentiation. Its capacity to regulate cell growth and development has been linked to the occurrence of several cancers including that of the prostate. The transmembrane receptor Notch-1 of this pathway has been linked to the oncogenic role of Notch signalling in prostate adenocarcinoma. Other studies have suggested a tumour suppressive function for Notch-1. This review focuses on the role of Notch-1 in prostate cancer development and maintenance and relates this to the fundamental role of Notch in normal prostate development. The current understanding of the aberrant Notch signalling characteristic of prostate cancer is discussed, and recent therapeutic advances in this field are presented.
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Affiliation(s)
- Rebecca O'Brien
- Translational Radiobiology and Molecular Oncology, Applied Radiation Therapy Trinity, Discipline of Radiation Therapy, Trinity College Dublin, Dublin, Ireland
| | - Laure Marignol
- Translational Radiobiology and Molecular Oncology, Applied Radiation Therapy Trinity, Discipline of Radiation Therapy, Trinity College Dublin, Dublin, Ireland.
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22
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Londero AP, Orsaria M, Marzinotto S, Grassi T, Fruscalzo A, Calcagno A, Bertozzi S, Nardini N, Stella E, Lellé RJ, Driul L, Tell G, Mariuzzi L. Placental aging and oxidation damage in a tissue micro-array model: an immunohistochemistry study. Histochem Cell Biol 2016; 146:191-204. [PMID: 27106773 DOI: 10.1007/s00418-016-1435-6] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/11/2016] [Indexed: 12/12/2022]
Abstract
To evaluate the expression of markers correlated with cellular senescence and DNA damage (8-hydroxy-2'-deoxy-guanosine (8-OHdG), p53, p21, APE1/Ref-1 (APE1), interleukin (IL-6 and IL-8) in placentas from healthy and pathologic pregnancies. This retrospective study considered a placental tissue micro-array containing 92 controls from different gestational ages and 158 pathological cases including preeclampsia (PE), HELLP syndrome (hemolysis, elevated liver enzymes, low platelet count), small for gestational age (SGA) fetuses, and intrauterine growth restriction (IUGR) occurring at different gestational ages. In this study, we demonstrated a significant influence of gestational age on the expression in the trophoblast of 8-OHdG, p53, p21, APE1, and IL-6. In placentas of cases affected by PE, HELLP, or IUGR, there was an increased expression of 8-OHdG, p53, APE1, and IL-6 compared to controls (only IL-8 was significantly decreased in cases). In both groups of pathology between 22- and 34-week gestation and after 34-week gestation, APE1 levels were higher in the trophoblast of women affected by hypertensive disorders of pregnancy than women carrying an IUGR fetus. The cytoplasmic expression of 8-OHdG was increased in placentas in IUGR cases compared to PE or HELLP pregnancies. In cases after 34-week gestation, p21 was higher in SGA and IUGR than in controls and late PE. Moreover, p53 was increased after 34-week gestation in IUGR pregnancies. Placentas from pathological pregnancies had an altered expression of 8-OHdG, p53, p21, APE1, IL-6, and IL-8. The alterations of intracellular pathways involving these elements may be the cause or the consequence of placental dysfunction, but in any case reflect an impaired placental function, possibly due to increased aging velocity in pathologic cases.
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Affiliation(s)
- Ambrogio P Londero
- Clinic of Obstetrics and Gynecology, Deparment of Experimental Clinical and Medical Science, University of Udine, Piazzale SM della Misericordia, 15, 33100, Udine, Italy. .,Unit of Obstetrics and Gynecology, S. Polo Hospital, 34074, Monfalcone, GO, Italy.
| | - Maria Orsaria
- Department of Medical and Biological Sciences, University of Udine, 33100, Udine, Italy
| | - Stefania Marzinotto
- Department of Medical and Biological Sciences, University of Udine, 33100, Udine, Italy
| | - Tiziana Grassi
- Clinic of Obstetrics and Gynecology, Deparment of Experimental Clinical and Medical Science, University of Udine, Piazzale SM della Misericordia, 15, 33100, Udine, Italy
| | - Arrigo Fruscalzo
- Frauenklinik, St Franziskus Hospital, Münster, Germany.,Clinic of Obstetrics and Gynecology and Institute of Pathology, University Hospital of Münster, Albert-Schweitzer-Campus 1, Gebäude: A1, 48149, Münster, Germany
| | - Angelo Calcagno
- Clinic of Obstetrics and Gynecology, Deparment of Experimental Clinical and Medical Science, University of Udine, Piazzale SM della Misericordia, 15, 33100, Udine, Italy
| | - Serena Bertozzi
- Department of Surgical Oncology, IRCCS CRO, 33081, Aviano, PN, Italy
| | - Nastassia Nardini
- Department of Medical and Biological Sciences, University of Udine, 33100, Udine, Italy
| | - Enrica Stella
- Clinic of Obstetrics and Gynecology, Deparment of Experimental Clinical and Medical Science, University of Udine, Piazzale SM della Misericordia, 15, 33100, Udine, Italy
| | - Ralph J Lellé
- Clinic of Obstetrics and Gynecology and Institute of Pathology, University Hospital of Münster, Albert-Schweitzer-Campus 1, Gebäude: A1, 48149, Münster, Germany
| | - Lorenza Driul
- Clinic of Obstetrics and Gynecology, Deparment of Experimental Clinical and Medical Science, University of Udine, Piazzale SM della Misericordia, 15, 33100, Udine, Italy
| | - Gianluca Tell
- Department of Medical and Biological Sciences, University of Udine, 33100, Udine, Italy
| | - Laura Mariuzzi
- Department of Medical and Biological Sciences, University of Udine, 33100, Udine, Italy
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23
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Stulpinas A, Imbrasaitė A, Krestnikova N, Šarlauskas J, Čėnas N, Kalvelytė AV. Study of Bioreductive Anticancer Agent RH-1-Induced Signals Leading the Wild-Type p53-Bearing Lung Cancer A549 Cells to Apoptosis. Chem Res Toxicol 2015; 29:26-39. [DOI: 10.1021/acs.chemrestox.5b00336] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Aurimas Stulpinas
- Vilnius University Institute of Biochemistry, Mokslininku
st. 12, LT-08662 Vilnius, Lithuania
| | - Aušra Imbrasaitė
- Vilnius University Institute of Biochemistry, Mokslininku
st. 12, LT-08662 Vilnius, Lithuania
| | - Natalija Krestnikova
- Vilnius University Institute of Biochemistry, Mokslininku
st. 12, LT-08662 Vilnius, Lithuania
| | - Jonas Šarlauskas
- Vilnius University Institute of Biochemistry, Mokslininku
st. 12, LT-08662 Vilnius, Lithuania
| | - Narimantas Čėnas
- Vilnius University Institute of Biochemistry, Mokslininku
st. 12, LT-08662 Vilnius, Lithuania
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24
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Jacovas VC, Rovaris DL, Peréz O, de Azevedo S, Macedo GS, Sandoval JR, Salazar-Granara A, Villena M, Dugoujon JM, Bisso-Machado R, Petzl-Erler ML, Salzano FM, Ashton-Prolla P, Ramallo V, Bortolini MC. Genetic Variations in the TP53 Pathway in Native Americans Strongly Suggest Adaptation to the High Altitudes of the Andes. PLoS One 2015; 10:e0137823. [PMID: 26382048 PMCID: PMC4575214 DOI: 10.1371/journal.pone.0137823] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2015] [Accepted: 08/24/2015] [Indexed: 02/05/2023] Open
Abstract
The diversity of the five single nucleotide polymorphisms located in genes of the TP53 pathway (TP53, rs1042522; MDM2, rs2279744; MDM4, rs1563828; USP7, rs1529916; and LIF, rs929271) were studied in a total of 282 individuals belonging to Quechua, Aymara, Chivay, Cabanaconde, Yanke, Taquile, Amantani, Anapia, Uros, Guarani Ñandeva, and Guarani Kaiowá populations, characterized as Native American or as having a high level (> 90%) of Native American ancestry. In addition, published data pertaining to 100 persons from five other Native American populations (Surui, Karitiana, Maya, Pima, and Piapoco) were analyzed. The populations were classified as living in high altitude (≥ 2,500 m) or in lowlands (< 2,500 m). Our analyses revealed that alleles USP7-G, LIF-T, and MDM2-T showed significant evidence that they were selected for in relation to harsh environmental variables related to high altitudes. Our results show for the first time that alleles of classical TP53 network genes have been evolutionary co-opted for the successful human colonization of the Andes.
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Affiliation(s)
- Vanessa Cristina Jacovas
- Departamento de Genética, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brasil
| | - Diego Luiz Rovaris
- Departamento de Genética, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brasil
| | - Orlando Peréz
- Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET), Puerto Madryn, Argentina
| | - Soledad de Azevedo
- Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET), Puerto Madryn, Argentina
| | - Gabriel Souza Macedo
- Departamento de Genética, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brasil
| | - José Raul Sandoval
- Facultad de Medicina Humana, Universidad de San Martin de Porres (USMP), Lima, Peru
| | | | - Mercedes Villena
- Instituto Boliviano de Biología de Altura (IBBA), Universidad Mayor de San Andres, La Paz, Bolivia
| | - Jean-Michel Dugoujon
- Anthropologie Moléculaire et Imagerie de Synthèse, CNRS UMR 5288, Université Paul Sabatier Toulouse III, Toulouse, 31000, France
| | - Rafael Bisso-Machado
- Departamento de Genética, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brasil
| | - Maria Luiza Petzl-Erler
- Laboratório de Genética Molecular, Departamento de Genética, Universidade Federal do Paraná, Curitiba, PR, Brasil
| | - Francisco Mauro Salzano
- Departamento de Genética, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brasil
| | - Patricia Ashton-Prolla
- Departamento de Genética, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brasil
- Serviço de Genética Medica, Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, Brazil
| | - Virginia Ramallo
- Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET), Puerto Madryn, Argentina
| | - Maria Cátira Bortolini
- Departamento de Genética, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brasil
- * E-mail:
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Identification and characterisation of Emp53, the homologue of human tumor suppressor p53, from Echinococcus multilocularis: its role in apoptosis and the oxidative stress response. Int J Parasitol 2015; 45:517-26. [DOI: 10.1016/j.ijpara.2015.02.010] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2014] [Revised: 01/29/2015] [Accepted: 02/02/2015] [Indexed: 12/18/2022]
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Chen H, Goodus MT, de Toledo SM, Azzam EI, Levison SW, Souayah N. Ionizing Radiation Perturbs Cell Cycle Progression of Neural Precursors in the Subventricular Zone Without Affecting Their Long-Term Self-Renewal. ASN Neuro 2015; 7:7/3/1759091415578026. [PMID: 26056396 PMCID: PMC4461572 DOI: 10.1177/1759091415578026] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Damage to normal human brain cells from exposure to ionizing radiation may occur during the course of radiotherapy or from accidental exposure. Delayed effects may complicate the immediate effects resulting in neurodegeneration and cognitive decline. We examined cellular and molecular changes associated with exposure of neural stem/progenitor cells (NSPs) to 137Cs γ-ray doses in the range of 0 to 8 Gy. Subventricular zone NSPs isolated from newborn mouse pups were analyzed for proliferation, self-renewal, and differentiation, shortly after irradiation. Strikingly, there was no apparent increase in the fraction of dying cells after irradiation, and the number of single cells that formed neurospheres showed no significant change from control. Upon differentiation, irradiated neural precursors did not differ in their ability to generate neurons, astrocytes, and oligodendrocytes. By contrast, progression of NSPs through the cell cycle decreased dramatically after exposure to 8 Gy (p < .001). Mice at postnatal day 10 were exposed to 8 Gy of γ rays delivered to the whole body and NSPs of the subventricular zone were analyzed using a four-color flow cytometry panel combined with ethynyl deoxyuridine incorporation. Similar flow cytometric analyses were performed on NSPs cultured as neurospheres. These studies revealed that neither the percentage of neural stem cells nor their proliferation was affected. By contrast, γ-irradiation decreased the proliferation of two classes of multipotent cells and increased the proliferation of a specific glial-restricted precursor. Altogether, these results support the conclusion that primitive neural precursors are radioresistant, but their proliferation is slowed down as a consequence of γ-ray exposure.
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Affiliation(s)
- Hongxin Chen
- Department of Neurology and Neurosciences, Rutgers University-New Jersey Medical School, Newark, NJ, USA
| | - Matthew T Goodus
- Department of Neurology and Neurosciences, Rutgers University-New Jersey Medical School, Newark, NJ, USA
| | - Sonia M de Toledo
- Department of Radiology, Rutgers University-New Jersey Medical School, Newark, NJ, USA
| | - Edouard I Azzam
- Department of Radiology, Rutgers University-New Jersey Medical School, Newark, NJ, USA
| | - Steven W Levison
- Department of Neurology and Neurosciences, Rutgers University-New Jersey Medical School, Newark, NJ, USA
| | - Nizar Souayah
- Department of Neurology and Neurosciences, Rutgers University-New Jersey Medical School, Newark, NJ, USA
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Nakamura Y, Yamazaki Y, Felizola SJ, Ise K, Morimoto R, Satoh F, Arai Y, Sasano H. Adrenocortical carcinoma: review of the pathologic features, production of adrenal steroids, and molecular pathogenesis. Endocrinol Metab Clin North Am 2015; 44:399-410. [PMID: 26038208 DOI: 10.1016/j.ecl.2015.02.007] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Adrenocortical carcinoma (ACC) is a malignant neoplasm often associated with an aggressive biological behavior. The histologic differentiation between ACC and adrenocortical adenoma (ACA) is largely determined by employing the Weiss criteria, although this classification may not apply to all the cases. Additionally, various genomic features of ACC could be an auxiliary mode to establish the diagnosis of ACC. Most ACC cases are hormonally functional, and immunohistochemical analysis of steroidogenic enzymes has provided pivotal information as to the analysis of intratumoral production of corticosteroids. This article summarizes the current status of the histopathological diagnosis, molecular pathogenesis, and hormonal features of ACC.
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Affiliation(s)
- Yasuhiro Nakamura
- Department of Pathology, Tohoku University Graduate School of Medicine, 2-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan
| | - Yuto Yamazaki
- Department of Pathology, Tohoku University Graduate School of Medicine, 2-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan
| | - Saulo J Felizola
- Department of Pathology, Tohoku University Graduate School of Medicine, 2-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan
| | - Kazue Ise
- Department of Pathology, Tohoku University Graduate School of Medicine, 2-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan
| | - Ryo Morimoto
- Division of Nephrology, Endocrinology, and Vascular Medicine, Department of Medicine, Tohoku University Graduate School of Medicine, 2-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan
| | - Fumitoshi Satoh
- Division of Nephrology, Endocrinology, and Vascular Medicine, Department of Medicine, Tohoku University Graduate School of Medicine, 2-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan
| | - Yoichi Arai
- Department of Urology, Tohoku University Graduate School of Medicine, 2-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan
| | - Hironobu Sasano
- Department of Pathology, Tohoku University Graduate School of Medicine, 2-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan.
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28
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Kurkalang S, Banerjee A, Dkhar H, Nongrum HB, Ganguly B, Islam M, Rangad GM, Chatterjee A. Precocious anaphase and expression of Securin and p53 genes as candidate biomarkers for the early detection in areca nut-induced carcinogenesis. Mutagenesis 2014; 30:381-9. [DOI: 10.1093/mutage/geu083] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
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29
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Tan M, Wettersten HI, Chu K, Huso DL, Watnick T, Friedlander S, Landesman Y, Weiss RH. Novel inhibitors of nuclear transport cause cell cycle arrest and decrease cyst growth in ADPKD associated with decreased CDK4 levels. Am J Physiol Renal Physiol 2014; 307:F1179-86. [PMID: 25234309 PMCID: PMC4254973 DOI: 10.1152/ajprenal.00406.2014] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2014] [Accepted: 09/16/2014] [Indexed: 02/07/2023] Open
Abstract
Autosomal-dominant polycystic kidney disease (ADPKD) is a progressive, proliferative renal disease. Kidneys from ADPKD patients are characterized by the presence of cysts that are marked by enhanced proliferation and apoptosis of renal tubular epithelial cells. Current treatment of this disease is supportive, as there are few if any clinically validated targeted therapeutics. Given the parallels between cystic disease and cancer, and in light of our findings of the efficacy of the nuclear transport inhibitors in kidney cancer, which has similarities to ADPKD, we asked whether such inhibitors show utility in ADPKD. In this study, we tested selective inhibitors of nuclear export (SINE) in two human ADPKD cell lines and in an in vivo mouse model of ADPKD. After effective downregulation of a nuclear exporter, exportin 1 (XPO1), with KPT-330, both cell lines showed dose-dependent inhibition of cell proliferation through G₀/G₁ arrest associated with downregulation of CDK4, with minimal apoptosis. To analyze mechanisms of CDK4 decrease by XPO1 inhibition, localization of various XPO1 target proteins was examined, and C/EBPβ was found to be localized in the nucleus by XPO1 inhibition, resulting in an increase of C/EBPα, which activates degradation of CDK4. Furthermore, inhibition of XPO1 with the parallel inhibitor KPT-335 attenuated cyst growth in vivo in the PKD1 mutant mouse model Pkd1(v/v). Thus, inhibition of nuclear export by KPT-330, which has shown no adverse effects in renal serum chemistries and urinalyses in animal models, and which is already in phase 1 trials for cancers, will be rapidly translatable to human ADPKD.
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Affiliation(s)
| | | | - Kristy Chu
- Department of Molecular and Comparative Pathobiology, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - David L Huso
- Department of Molecular and Comparative Pathobiology, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Terry Watnick
- Division of Nephrology, University of Maryland School of Medicine, Baltimore, Maryland
| | | | | | - Robert H Weiss
- Graduate Group in Comparative Pathology, Division of Nephrology, Department of Internal Medicine, and Cancer Center, University of California, Davis, California; Medical Service, Sacramento Veterans Affairs Medical Center, Sacramento, California
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30
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Herbert KJ, Holloway A, Cook AL, Chin SP, Snow ET. Arsenic exposure disrupts epigenetic regulation of SIRT1 in human keratinocytes. Toxicol Appl Pharmacol 2014; 281:136-45. [PMID: 25281835 DOI: 10.1016/j.taap.2014.09.012] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2014] [Revised: 09/09/2014] [Accepted: 09/22/2014] [Indexed: 02/08/2023]
Abstract
Arsenic is an environmental toxin which increases skin cancer risk for exposed populations worldwide; however the underlying biomolecular mechanism for arsenic-induced carcinogenesis is complex and poorly defined. Recent investigations show that histone deacetylase and DNA methyltransferase activity is impaired, and epigenetic patterns of gene regulation are consistently altered in cancers associated with arsenic exposure. Expression of the histone deacetylase SIRT1 is altered in solid tumours and haematological malignancies; however its role in arsenic-induced pathology is unknown. In this study we investigated the effect of arsenic on epigenetic regulation of SIRT1 and its targeting microRNA, miR-34a in primary human keratinocytes. Acetylation of histone H4 at lysine 16 (H4K16) increased in keratinocytes exposed to 0.5μM arsenite [As(III)]; and this was associated with chromatin remodelling at the miR-34a promoter. Moreover, although SIRT1 protein initially increased in these As(III)-exposed cells, after 24days expression was not significantly different from untreated controls. Extended exposure to low-dose As(III) (0.5μM; >5weeks) compromised the pattern of CpG methylation at SIRT1 and miR-34a gene promoters, and this was associated with altered expression for both genes. We have found that arsenic alters epigenetic regulation of SIRT1 expression via structural reorganisation of chromatin at the miR-34a gene promoter in the initial 24h of exposure; and over time, through shifts in miR-34a and SIRT1 gene methylation. Taken together, this investigation demonstrates that arsenic produces cumulative disruptions to epigenetic regulation of miR-34a expression, and this is associated with impaired coordination of SIRT1 functional activity.
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Affiliation(s)
- Katharine J Herbert
- School of Health Sciences, University of Tasmania, Launceston, TAS 7250, Australia
| | - Adele Holloway
- Menzies Research Institute Tasmania, University of Tasmania, Hobart, TAS 7000, Australia
| | - Anthony L Cook
- School of Health Sciences, University of Tasmania, Launceston, TAS 7250, Australia
| | - Suyin P Chin
- Menzies Research Institute Tasmania, University of Tasmania, Hobart, TAS 7000, Australia
| | - Elizabeth T Snow
- School of Health Sciences, University of Tasmania, Launceston, TAS 7250, Australia.
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31
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Ghosh M, Ryan RO. Curcumin homing to the nucleolus: mechanism for initiation of an apoptotic program. J Nutr Biochem 2014; 25:1117-1123. [PMID: 25172633 DOI: 10.1016/j.jnutbio.2014.06.009] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2014] [Revised: 05/07/2014] [Accepted: 06/12/2014] [Indexed: 11/15/2022]
Abstract
Curcumin is a plant-derived polyphenol that displays antitumor properties. Incubation of cultured SF-767 glioma cells with curcumin gave rise to intense intranuclear foci of curcumin fluorescence. In vitro studies revealed that nuclear homing by curcumin is not a result of DNA/chromatin binding. On the other hand, curcumin fluorescence colocalized with nucleophosmin, a nucleolus marker protein. To determine the temporal relationship between curcumin-induced apoptosis and nucleolar homing, confocal live cell imaging was performed. The data show that curcumin localization to the nucleolus occurs prior to cell surface exposure of phosphatidylserine. In studies of the mechanism of curcumin-induced apoptosis in SF-767 cells, its effect on the subcellular location of p14(ARF) was determined. Whereas p14(ARF) was confined to the nucleolus in untreated cells, 2 h following incubation with curcumin, it displayed a diffuse nuclear distribution. Given the role of nuclear p14(ARF) in binding the E3 ubiquitin ligase, mouse double minute 2 homolog (MDM2), the effect of curcumin treatment on cellular levels of the tumor suppressor protein, p53, was examined. Between 2 and 4 h following curcumin treatment, p53 levels increased with maximum levels reached by 8 h. Thus, curcumin homing to the nucleolus induces redistribution of p14(ARF) to the nucleoplasm where interaction with MDM2 leads to stabilization of p53, with subsequent initiation of apoptosis.
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Affiliation(s)
- Mistuni Ghosh
- Children's Hospital Oakland Research Institute, 5700 Martin Luther King Jr. Way, Oakland CA 94609, USA
| | - Robert O Ryan
- Children's Hospital Oakland Research Institute, 5700 Martin Luther King Jr. Way, Oakland CA 94609, USA.
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32
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Abstract
The activity of c-Jun N-terminal kinase (JNK) was initially described as ultraviolet- and oncogene-induced kinase activity on c-Jun. Shortly after this initial discovery, JNK activation was reported for a wider variety of DNA-damaging agents, including γ-irradiation and chemotherapeutic compounds. As the DNA damage response mechanisms were progressively uncovered, the mechanisms governing the activation of JNK upon genotoxic stresses became better understood. In particular, a recent set of papers links the physical breakage in DNA, the activation of the transcription factor NF-κB, the secretion of TNF-α, and an autocrine activation of the JNK pathway. In this review, we will focus on the pathway that is initiated by a physical break in the DNA helix, leading to JNK activation and the resultant cellular consequences. The implications of these findings will be discussed in the context of cancer therapy with DNA-damaging agents.
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Affiliation(s)
- Vincent Picco
- Biomedical Research Department, Centre Scientifique de Monaco, Nice, France
| | - Gilles Pagès
- Institute for Research on Cancer and Aging of Nice, University of Nice Sophia Antipolis, Nice, France
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33
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Apoptosis and molecular targeting therapy in cancer. BIOMED RESEARCH INTERNATIONAL 2014; 2014:150845. [PMID: 25013758 PMCID: PMC4075070 DOI: 10.1155/2014/150845] [Citation(s) in RCA: 726] [Impact Index Per Article: 72.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 02/04/2014] [Accepted: 05/11/2014] [Indexed: 12/22/2022]
Abstract
Apoptosis is the programmed cell death which maintains the healthy survival/death balance in metazoan cells. Defect in apoptosis can cause cancer or autoimmunity, while enhanced apoptosis may cause degenerative diseases. The apoptotic signals contribute into safeguarding the genomic integrity while defective apoptosis may promote carcinogenesis. The apoptotic signals are complicated and they are regulated at several levels. The signals of carcinogenesis modulate the central control points of the apoptotic pathways, including inhibitor of apoptosis (IAP) proteins and FLICE-inhibitory protein (c-FLIP). The tumor cells may use some of several molecular mechanisms to suppress apoptosis and acquire resistance to apoptotic agents, for example, by the expression of antiapoptotic proteins such as Bcl-2 or by the downregulation or mutation of proapoptotic proteins such as BAX. In this review, we provide the main regulatory molecules that govern the main basic mechanisms, extrinsic and intrinsic, of apoptosis in normal cells. We discuss how carcinogenesis could be developed via defective apoptotic pathways or their convergence. We listed some molecules which could be targeted to stimulate apoptosis in different cancers. Together, we briefly discuss the development of some promising cancer treatment strategies which target apoptotic inhibitors including Bcl-2 family proteins, IAPs, and c-FLIP for apoptosis induction.
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34
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Vlatković N, Boyd MT, Rubbi CP. Nucleolar control of p53: a cellular Achilles' heel and a target for cancer therapy. Cell Mol Life Sci 2014; 71:771-91. [PMID: 23685903 PMCID: PMC11113510 DOI: 10.1007/s00018-013-1361-x] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2012] [Revised: 04/07/2013] [Accepted: 04/30/2013] [Indexed: 02/07/2023]
Abstract
Nucleoli perform a crucial cell function, ribosome biogenesis, and of critical relevance to the subject of this review, they are also extremely sensitive to cellular stresses, which can cause loss of function and/or associated structural disruption. In recent years, we have learned that cells take advantage of this stress sensitivity of nucleoli, using them as stress sensors. One major protein regulated by this role of nucleoli is the tumor suppressor p53, which is activated in response to diverse cellular injuries in order to exert its onco-protective effects. Here we discuss a model of nucleolar regulation of p53, which proposes that key steps in the promotion of p53 degradation by the ubiquitin ligase MDM2 occur in nucleoli, thus providing an explanation for the observed link between nucleolar disruption and p53 stability. We review current evidence for this compartmentalization in p53 homeostasis and highlight current limitations of the model. Interestingly, a number of current chemotherapeutic agents capable of inducing a p53 response are likely to do so by targeting nucleolar functions and these compounds may serve to inform further improved therapeutic targeting of nucleoli.
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Affiliation(s)
- Nikolina Vlatković
- Cancer Research Centre, University of Liverpool, 200 London Rd, Liverpool, L3 9TA UK
| | - Mark T. Boyd
- Cancer Research Centre, University of Liverpool, 200 London Rd, Liverpool, L3 9TA UK
| | - Carlos P. Rubbi
- Cancer Research Centre, University of Liverpool, 200 London Rd, Liverpool, L3 9TA UK
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c-Jun N-terminal kinase 1/c-Jun activation of the p53/microRNA 34a/sirtuin 1 pathway contributes to apoptosis induced by deoxycholic acid in rat liver. Mol Cell Biol 2014; 34:1100-20. [PMID: 24421392 DOI: 10.1128/mcb.00420-13] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
MicroRNAs (miRs) are increasingly associated with metabolic liver diseases. We have shown that ursodeoxycholic acid, a hydrophilic bile acid, counteracts the miR-34a/sirtuin 1 (SIRT1)/p53 pathway, activated in the liver of nonalcoholic steatohepatitis (NASH) patients. In contrast, hydrophobic bile acids, particularly deoxycholic acid (DCA), activate apoptosis and are increased in NASH. We evaluated whether DCA-induced apoptosis of rat hepatocytes occurs via miR-34a-dependent pathways and whether they connect with c-Jun N-terminal kinase (JNK) induction. DCA enhanced miR-34a/SIRT1/p53 proapoptotic signaling in a dose- and time-dependent manner. In turn, miR-34a inhibition and SIRT1 overexpression significantly rescued targeting of the miR-34a pathway and apoptosis by DCA. In addition, p53 overexpression activated the miR-34a/SIRT1/p53 pathway, further induced by DCA. DCA increased p53 expression as well as p53 transcriptional activation of PUMA and miR-34a itself, providing a functional mechanism for miR-34a activation. JNK1 and c-Jun were shown to be major targets of DCA, upstream of p53, in engaging the miR-34a pathway and apoptosis. Finally, activation of this JNK1/miR-34a proapoptotic circuit was also shown to occur in vivo in the rat liver. These results suggest that the JNK1/p53/miR-34a/SIRT1 pathway may represent an attractive pharmacological target for the development of new drugs to arrest metabolism- and apoptosis-related liver pathologies.
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36
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Brazel CY, Alaythan AA, Felling RJ, Calderon F, Levison SW. Molecular features of neural stem cells enable their enrichment using pharmacological inhibitors of survival-promoting kinases. J Neurochem 2013; 128:376-90. [PMID: 24032666 DOI: 10.1111/jnc.12447] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2012] [Revised: 09/05/2013] [Accepted: 09/10/2013] [Indexed: 11/28/2022]
Abstract
Isolating a pure population of neural stem cells (NSCs) has been difficult since no exclusive surface markers have been identified for panning or FACS purification. Moreover, additional refinements for maintaining NSCs in culture are required, since NSCs generate a variety of neural precursors (NPs) as they proliferate. Here, we demonstrate that post-natal rat NPs express low levels of pro-apoptotic molecules and resist phosphatidylinositol 3'OH kinase and extracellular regulated kinase 1/2 inhibition as compared to late oligodendrocyte progenitors. Furthermore, maintaining subventricular zone precursors in LY294002 and PD98059, inhibitors of PI3K and ERK1/2 signaling, eliminated lineage-restricted precursors as revealed by enrichment for Nestin(+)/SOX-2(+) cells. The cells that survived formed neurospheres and 89% of these neurospheres were tripotential, generating neurons, astrocytes, and oligodendrocytes. Without this enrichment step, less than 50% of the NPs were Nestin(+)/SOX-2(+) and 42% of the neurospheres were tripotential. In addition, neurospheres enriched using this procedure produced 3-times more secondary neurospheres, supporting the conclusion that this procedure enriches for NSCs. A number of genes that enhance survival were more highly expressed in neurospheres compared to late oligodendrocyte progenitors. Altogether, these studies demonstrate that primitive neural precursors can be enriched using a relatively simple and inexpensive means that will facilitate cell replacement strategies using stem cells as well as other studies whose goal is to reveal the fundamental properties of primitive neural precursors.
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Affiliation(s)
- Christine Y Brazel
- Department of Neurology and Neurosciences, Rutgers University-New Jersey Medical School, Newark, New Jersey, USA
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37
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Burger K, Mühl B, Kellner M, Rohrmoser M, Gruber-Eber A, Windhager L, Friedel CC, Dölken L, Eick D. 4-thiouridine inhibits rRNA synthesis and causes a nucleolar stress response. RNA Biol 2013; 10:1623-30. [PMID: 24025460 DOI: 10.4161/rna.26214] [Citation(s) in RCA: 98] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
High concentrations (> 100 µM) of the ribonucleoside analog 4-thiouridine (4sU) is widely used in methods for RNA analysis like photoactivatable-ribonucleoside-enhanced crosslinking and immunoprecipitation (PAR-CLIP) and nascent messenger (m)RNA labeling (4sU-tagging). Here, we show that 4sU-tagging at low concentrations ≤ 10 µM can be used to measure production and processing of ribosomal (r)RNA. However, elevated concentrations of 4sU (> 50 µM), which are usually used for mRNA labeling experiments, inhibit production and processing of 47S rRNA. The inhibition of rRNA synthesis is accompanied by nucleoplasmic translocation of nucleolar nucleophosmin (NPM1), induction of the tumor suppressor p53, and inhibition of proliferation. We conclude that metabolic labeling of RNA by 4sU triggers a nucleolar stress response, which might influence the interpretation of results. Therefore, functional ribosome biogenesis, nucleolar integrity, and cell cycle should be addressed in 4sU labeling experiments.
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Affiliation(s)
- Kaspar Burger
- Department of Molecular Epigenetics; Helmholtz Center Munich; Center for Integrated Protein Science Munich (CIPSM); Munich, Germany
| | - Bastian Mühl
- Department of Molecular Epigenetics; Helmholtz Center Munich; Center for Integrated Protein Science Munich (CIPSM); Munich, Germany
| | - Markus Kellner
- Department of Molecular Epigenetics; Helmholtz Center Munich; Center for Integrated Protein Science Munich (CIPSM); Munich, Germany
| | - Michaela Rohrmoser
- Department of Molecular Epigenetics; Helmholtz Center Munich; Center for Integrated Protein Science Munich (CIPSM); Munich, Germany
| | - Anita Gruber-Eber
- Department of Molecular Epigenetics; Helmholtz Center Munich; Center for Integrated Protein Science Munich (CIPSM); Munich, Germany
| | - Lukas Windhager
- Institute for Informatics, Teaching and Research Unit Bioinformatics; Ludwig-Maximilians-University Munich; Munich, Germany
| | - Caroline C Friedel
- Institute for Informatics, Teaching and Research Unit Bioinformatics; Ludwig-Maximilians-University Munich; Munich, Germany
| | - Lars Dölken
- Department of Medicine; Addenbrooke's Hospital; University of Cambridge; Cambridge, UK
| | - Dirk Eick
- Department of Molecular Epigenetics; Helmholtz Center Munich; Center for Integrated Protein Science Munich (CIPSM); Munich, Germany
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38
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Kurkalang S, Banerjee A, Ghoshal N, Dkhar H, Chatterjee A. Induction of chromosome instability and stomach cancer by altering the expression pattern of mitotic checkpoint genes in mice exposed to areca-nut. BMC Cancer 2013; 13:315. [PMID: 23805780 PMCID: PMC3727982 DOI: 10.1186/1471-2407-13-315] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2013] [Accepted: 06/20/2013] [Indexed: 12/31/2022] Open
Abstract
Background There are strong indications for a causal association between areca-nut consumption and cancers. In Meghalaya, India, the variety of areca-nut is used as raw and unprocessed form whose chemical composition and pharmacological actions have been reported. Yet we know little on the initial pathway involved in areca-nut associated carcinogenesis since it is difficult to assess its effects on genetic alterations without interference of other compounding factors. Therefore, present study was undertaken in mice to verify the ability of raw areca-nut (RAN) to induce cancer and to monitor the expression of certain genes involved in carcinogenesis. This study was not intended to isolate any active ingredients from the RAN and to look its action. Methods Three groups of mice (n = 25 in each) were taken and used at different time-points for different experimental analysis. The other three groups of mice (n = 15 in each) were considered for tumor induction studies. In each set, two groups were administered RAN-extract ad libitum in drinking water with or without lime. The expression of certain genes was assessed by conventional RT-PCR and immunoblotting. The mice were given the whole RAN-extract with and without lime in order to mimic the human consumption style of RAN. Results Histological preparation of stomach tissue revealed that RAN induced stomach cancer. A gradual increase in the frequency of precocious anaphase and aneuploid cells was observed in the bone marrow cells with a greater increment following RAN + lime administeration. Levels of p53, Bax, Securin and p65 in esophageal and stomach cells were elevated during early days of RAN exposure while those of different mitotic checkpoint proteins were downregulated. Apoptotic cell death was detected in non-cancerous stomach cells but not in tumor cells which showed overexpression of Bax and absence of PARP. Conclusion Present study suggested (a) RAN induces stomach cancer, however, presence of lime promoted higher cell transformation and thereby developed cancer earlier, (b) perturbations in components of the chromosome segregation machinery could be involved in the initial process of carcinogenicity and (c) the importance of precocious anaphase as a screening marker for identification of mitotic checkpoint defects during early days.
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Affiliation(s)
- Sillarine Kurkalang
- Molecular Genetics Laboratory, Department of Biotechnology & Bioinformatics, North-Eastern Hill University, Shillong, Meghalaya 793022, India
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39
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Salazar JJ, Gallego-Pinazo R, de Hoz R, Pinazo-Durán MD, Rojas B, Ramírez AI, Serrano M, Ramírez JM. "Super p53" mice display retinal astroglial changes. PLoS One 2013; 8:e65446. [PMID: 23762373 PMCID: PMC3676457 DOI: 10.1371/journal.pone.0065446] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2013] [Accepted: 04/24/2013] [Indexed: 12/17/2022] Open
Abstract
Tumour-suppressor genes, such as the p53 gene, produce proteins that inhibit cell division under adverse conditions, as in the case of DNA damage, radiation, hypoxia, or oxidative stress (OS). The p53 gene can arrest proliferation and trigger death by apoptosis subsequent to several factors. In astrocytes, p53 promotes cell-cycle arrest and is involved in oxidative stress-mediated astrocyte cell death. Increasingly, astrocytic p53 is proving fundamental in orchestrating neurodegenerative disease pathogenesis. In terms of ocular disease, p53 may play a role in hypoxia due to ischaemia and may be involved in the retinal response to oxidative stress (OS). We studied the influence of the p53 gene in the structural and quantitative characteristics of astrocytes in the retina. Adult mice of the C57BL/6 strain (12 months old) were distributed into two groups: 1) mice with two extra copies of p53 (“super p53”; n = 6) and 2) wild-type p53 age-matched control, as the control group (WT; n = 6). Retinas from each group were immunohistochemically processed to locate the glial fibrillary acidic protein (GFAP). GFAP+ astrocytes were manually counted and the mean area occupied for one astrocyte was quantified. Retinal-astrocyte distribution followed established patterns; however, morphological changes were seen through the retinas in relation to p53 availability. The mean GFAP+ area occupied by one astrocyte in “super p53” eyes was significantly higher (p<0.05; Student’s t-test) than in the WT. In addition, astroglial density was significantly higher in the “super p53” retinas than in the WT ones, both in the whole-retina (p<0,01 Student’s t-test) and in the intermediate and peripheral concentric areas of the retina (p<0.05 Student’s t-test). This fact might improve the resistance of the retinal cells against OS and its downstream signalling pathways.
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Affiliation(s)
- Juan J. Salazar
- Instituto de Investigaciones Oftalmológicas “Ramón Castroviejo”, Universidad Complutense de Madrid, Madrid, Spain
- Facultad de Óptica y Optometría, Universidad Complutense de Madrid, Madrid, Spain
| | - Roberto Gallego-Pinazo
- Ophthalmology Department of the University and Polytechnic Hospital La Fe, Valencia, Spain
- Ophthalmic Research Unit “Santiago Grisolia” Faculty of Medicine, University of Valencia, Valencia, Spain
| | - Rosa de Hoz
- Instituto de Investigaciones Oftalmológicas “Ramón Castroviejo”, Universidad Complutense de Madrid, Madrid, Spain
- Facultad de Óptica y Optometría, Universidad Complutense de Madrid, Madrid, Spain
| | - Maria D. Pinazo-Durán
- Ophthalmic Research Unit “Santiago Grisolia” Faculty of Medicine, University of Valencia, Valencia, Spain
| | - Blanca Rojas
- Instituto de Investigaciones Oftalmológicas “Ramón Castroviejo”, Universidad Complutense de Madrid, Madrid, Spain
- Facultad de Medicina, Universidad Complutense de Madrid, Madrid, Spain
| | - Ana I. Ramírez
- Instituto de Investigaciones Oftalmológicas “Ramón Castroviejo”, Universidad Complutense de Madrid, Madrid, Spain
- Facultad de Óptica y Optometría, Universidad Complutense de Madrid, Madrid, Spain
| | | | - José M. Ramírez
- Instituto de Investigaciones Oftalmológicas “Ramón Castroviejo”, Universidad Complutense de Madrid, Madrid, Spain
- Facultad de Medicina, Universidad Complutense de Madrid, Madrid, Spain
- * E-mail:
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40
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Ayed-Boussema I, Abassi H, Bouaziz C, Hlima WB, Ayed Y, Bacha H. Antioxidative and antigenotoxic effect of vitamin E against patulin cytotoxicity and genotoxicity in HepG2 cells. ENVIRONMENTAL TOXICOLOGY 2013; 28:299-306. [PMID: 21656641 DOI: 10.1002/tox.20720] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2010] [Accepted: 03/10/2011] [Indexed: 05/30/2023]
Abstract
Patulin (PAT) is a mycotoxin produced in fruits, mainly in apples, by certain species of Penicillium, Aspergillus, and Byssochlamys. It has been shown that PAT is cytotoxic, genotoxic, and mutagenic in different cell types. Several studies incriminate the oxidative stress as a mechanism of PAT-mediated toxicity. In this context, our aim was to investigate the protective role of Vitamin E (Vit E), an antioxidant agent, against PAT induced cytotoxicity and genotoxicity in cultured HepG2 cells. The obtained results showed that addition of Vit E in cells treated with PAT significantly reduce cell mortality induced by this toxin. In the same conditions, Vit E decreased the intracellular level of ROS, reduced PAT induced p53 expression, and reversed PAT induced DNA damage. In addition, Vit E prevented significantly the percentage of chromosome aberrations induced by PAT in HepG2 cells in a concentration dependant manner. These results suggest that Vit E, an exogenous antioxidant agent, plays an important role in defense against PAT-induced cytotoxicity and genotoxicity, which confirms the involvement of oxidative stress in the induction of DNA damage by PAT in HepG2 cells.
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Affiliation(s)
- Imen Ayed-Boussema
- Laboratory for Research on Biologically Compatible Compounds-LRSBC, Monastir University, Rue Avicenne, Monastir 5019, Tunisia
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Abstract
The p53 tumor suppressor protein is a transcription factor controlling various outcomes, such as growth arrest and apoptosis, through the regulation of different sets of target genes. The nuclear mitotic apparatus protein (NuMA) plays important roles in spindle pole organization during mitosis and in chromatin regulation in the nucleus during interphase. Although NuMA has been shown to colocalize with several nuclear proteins, including high-mobility-group proteins I and Y and GAS41, the role of NuMA during interphase remains unclear. Here we report that NuMA binds to p53 to modulate p53-mediated transcription. Acute and partial ablation of NuMA attenuates the induction of the proarrested p21 gene following DNA damage, subsequently causing impaired cell cycle arrest. Interestingly, NuMA knockdown had little effect on the induction of the p53-dependent proapoptotic PUMA gene. Furthermore, NuMA is required for the recruitment of cyclin-dependent kinase 8 (Cdk8), a component of the Mediator complex and a promoter of p53-mediated p21 gene function. These data demonstrate that NuMA is critical for the target selectivity of p53-mediated transcription.
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42
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McKay BC, Cabrita MA. Arresting transcription and sentencing the cell: the consequences of blocked transcription. Mech Ageing Dev 2013; 134:243-52. [PMID: 23542592 DOI: 10.1016/j.mad.2013.03.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2012] [Revised: 02/16/2013] [Accepted: 03/16/2013] [Indexed: 10/27/2022]
Abstract
Bulky DNA adducts induced by agents like ultraviolet light, cisplatin and oxidative metabolism pose a block to elongation by RNA polymerase II (RNAPII). The arrested RNAPII can initiate the repair of transcription-blocking DNA lesions by transcription-coupled nucleotide excision repair (TC-NER) to permit efficient recovery of mRNA synthesis while widespread sustained transcription blocks lead to apoptosis. Therefore, RNAPII serves as a processive DNA damage sensor that identifies transcription-blocking DNA lesions. Cockayne syndrome (CS) is an autosomal recessive disorder characterized by a complex phenotype that includes clinical photosensitivity, progressive neurological degeneration and premature-aging. CS is associated with defects in TC-NER and the recovery of mRNA synthesis, making CS cells exquisitely sensitive to a variety of DNA damaging agents. These defects in the coupling of repair and transcription appear to underlie some of the complex clinical features of CS. Recent insight into the consequences of blocked transcription and their relationship to CS will be discussed.
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Affiliation(s)
- Bruce C McKay
- Cancer Therapeutics Program, Ottawa Hospital Research Institute, Canada.
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Cmielova J, Havelek R, Kohlerova R, Soukup T, Bruckova L, Suchanek J, Vavrova J, Mokry J, Rezacova M. The effect of ATM kinase inhibition on the initial response of human dental pulp and periodontal ligament mesenchymal stem cells to ionizing radiation. Int J Radiat Biol 2013; 89:501-11. [PMID: 23425510 DOI: 10.3109/09553002.2013.775530] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
PURPOSE This study evaluates early changes in human mesenchymal stem cells (MSC) isolated from dental pulp and periodontal ligament after γ-irradiation and the effect of ataxia-telangiectasia mutated (ATM) inhibition. METHODS MSC were irradiated with 2 and 20 Gy by (60)Co. For ATM inhibition, specific inhibitor KU55933 was used. DNA damage was measured by Comet assay and γH2AX detection. Cell cycle distribution and proteins responding to DNA damage were analyzed 2-72 h after the irradiation. RESULTS The irradiation of MSC causes an increase in γH2AX; the phosphorylation was ATM-dependent. Irradiation activates ATM kinase, and the level of p53 protein is increased due to its phosphorylation on serine15. While this phosphorylation of p53 is ATM-dependent in MSC, the increase in p53 was not prevented by ATM inhibition. A similar trend was observed for Chk1 and Chk2. The increase in p21 is greater without ATM inhibition. ATM inhibition also does not fully abrogate the accumulation of irradiated MSC in the G2-phase of the cell-cycle. CONCLUSIONS In irradiated MSC, double-strand breaks are tagged quickly by γH2AX in an ATM-dependent manner. Although phosphorylations of p53(ser15), Chk1(ser345) and Chk2(thr68) are ATM-dependent, the overall amount of these proteins increases when ATM is inhibited. In both types of MSC, ATM-independent mechanisms for cell-cycle arrest in the G2-phase are triggered.
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Affiliation(s)
- Jana Cmielova
- Department of Medical Biochemistry, Faculty of Medicine in Hradec Kralove,Charles University in Prague, Czech Republic.
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Wolters S, Schumacher B. Genome maintenance and transcription integrity in aging and disease. Front Genet 2013; 4:19. [PMID: 23443494 PMCID: PMC3580961 DOI: 10.3389/fgene.2013.00019] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2012] [Accepted: 02/03/2013] [Indexed: 12/21/2022] Open
Abstract
DNA damage contributes to cancer development and aging. Congenital syndromes that affect DNA repair processes are characterized by cancer susceptibility, developmental defects, and accelerated aging (Schumacher et al., 2008). DNA damage interferes with DNA metabolism by blocking replication and transcription. DNA polymerase blockage leads to replication arrest and can gives rise to genome instability. Transcription, on the other hand, is an essential process for utilizing the information encoded in the genome. DNA damage that interferes with transcription can lead to apoptosis and cellular senescence. Both processes are powerful tumor suppressors (Bartek and Lukas, 2007). Cellular response mechanisms to stalled RNA polymerase II complexes have only recently started to be uncovered. Transcription-coupled DNA damage responses might thus play important roles for the adjustments to DNA damage accumulation in the aging organism (Garinis et al., 2009). Here we review human disorders that are caused by defects in genome stability to explore the role of DNA damage in aging and disease. We discuss how the nucleotide excision repair system functions at the interface of transcription and repair and conclude with concepts how therapeutic targeting of transcription might be utilized in the treatment of cancer.
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Affiliation(s)
- Stefanie Wolters
- Cologne Excellence Cluster for Cellular Stress Responses in Aging-Associated Diseases, Institute for Genetics, University of Cologne Cologne, Germany
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Mei J, Li MQ, Ding D, Li DJ, Jin LP, Hu WG, Zhu XY. Indoleamine 2,3-dioxygenase-1 (IDO1) enhances survival and invasiveness of endometrial stromal cells via the activation of JNK signaling pathway. INTERNATIONAL JOURNAL OF CLINICAL AND EXPERIMENTAL PATHOLOGY 2013; 6:431-444. [PMID: 23411497 PMCID: PMC3563200] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 12/12/2012] [Accepted: 01/27/2013] [Indexed: 06/01/2023]
Abstract
Evidence for an immunosuppressive function of indoleamine 2,3-dioxygenase (IDO) has been accumulating. However, the unusual distribution of IDO1 in gynecologic cancer cells suggests that modulating immunity may not its only function. To clarify the physiological importance of IDO1 in endometriosis, a tumor-like benign disease, we have investigated the potential mechanism by which IDO1 modulated endometrial stromal cells (ESCs) proliferation and invasion. ESCs were obtained from 16 control women (normal) and 14 patients with ovarian endometrioma, then the normal ESCs were treated with plasmid pEGFP-N1-IDO1 or SD11-IDO1 short hairpin RNA (shRNA) alone, or in combination with c-Jun N-terminal kinase (JNK) inhibitor (SP600125), and subjected to cell viability, proliferation, apoptosis assay and Matrigel invasion assay. IDO1 mRNA expression was evaluated by quantitative real-time reverse transcription-polymerase chain reaction (real-time PCR), and protein levels of IDO1, survivin, protein 53 (p53), matrix metalloproteinase (MMP)-2, MMP-9, tissue-inhibitor of metalloproteinase-1 (TIMP-1) and cyclooxygenase-2 (COX-2) in IDO1-overexpressing and IDO1-deficiency ESCs were analyzed by in-cell Western. We found that IDO1 expression was higher in endometriosis-derived eutopic and ectopic ESCs, compared with endometriosis-free normal ESCs. As a result, IDO1-overexpression in ESCs was markedly linked to reduction of apoptosis and p53 expression, and upregulation of survival, proliferation, invasion, as well as expression of MMP-9, COX-2 expression, rather than expression of survivin, MMP-2 and TIMP-1. Reversely, JNK blockage could abrogate these alterations of ESCs in IDO1-overexpressing milieu, suggesting that JNK signaling pathway was indispensable for ESCs survival, proliferation and invasion enhanced by IDO1, which may contribute to the pathophysiology of endometriosis.
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Affiliation(s)
- Jie Mei
- Laboratory for Reproductive Immunology, Hospital and Institute of Obstetrics & Gynecology, Shanghai Medical School, Fudan UniversityShanghai, 200011, China;
| | - Ming-Qing Li
- Laboratory for Reproductive Immunology, Hospital and Institute of Obstetrics & Gynecology, Shanghai Medical School, Fudan UniversityShanghai, 200011, China;
| | - Ding Ding
- Laboratory for Reproductive Immunology, Hospital and Institute of Obstetrics & Gynecology, Shanghai Medical School, Fudan UniversityShanghai, 200011, China;
| | - Da-Jin Li
- Laboratory for Reproductive Immunology, Hospital and Institute of Obstetrics & Gynecology, Shanghai Medical School, Fudan UniversityShanghai, 200011, China;
| | - Li-Ping Jin
- Laboratory for Reproductive Immunology, Hospital and Institute of Obstetrics & Gynecology, Shanghai Medical School, Fudan UniversityShanghai, 200011, China;
| | - Wei-Guo Hu
- Laboratory for Reproductive Immunology, Hospital and Institute of Obstetrics & Gynecology, Shanghai Medical School, Fudan UniversityShanghai, 200011, China;
| | - Xiao-Yong Zhu
- Laboratory for Reproductive Immunology, Hospital and Institute of Obstetrics & Gynecology, Shanghai Medical School, Fudan UniversityShanghai, 200011, China;
- The Shanghai Key Laboratory of Female Reproductive Endocrine Related DiseasesShanghai, 200011, China.
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46
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NF-κB1 p50 promotes p53 protein translation through miR-190 downregulation of PHLPP1. Oncogene 2013; 33:996-1005. [PMID: 23396362 DOI: 10.1038/onc.2013.8] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2012] [Revised: 12/04/2012] [Accepted: 12/14/2012] [Indexed: 12/25/2022]
Abstract
The biological function of NF-κB1 (p50) in the regulation of protein expression is far from well understood owing to the lack of a transcriptional domain. Here, we report a novel function of p50 in its regulation of p53 protein translation under stress conditions. We found that the deletion of p50 (p50-/-) impaired arsenite-induced p53 protein expression, which could be restored after reconstitutive expression of HA-p50 in p50-/- cells, p50-/-(Ad-HA-p50). Further studies indicated that the amounts of p53 mRNA, p53 promoter-driven transcription activity and p53 protein degradation were comparable between wild-type and p50-/- cells. Moreover, we found that p50 was crucial for Akt/S6 ribosomal protein activation via inhibition of the translation of the PH domain and leucine-rich repeat protein phosphatases 1 (PHLPP1), a phosphatase of Akt. Further studies showed that p50-mediated upregulation of miR-190 was responsible for the inhibition of PHLPP1 translation by targeting the 3'-untranslated region of its mRNA. Collectively, we have identified a novel function of p50 in modulating p53 protein translation via regulation of the miR-190/PHLPP1/Akt-S6 ribosomal protein pathway.
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47
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New insights into p53 signaling and cancer cell response to DNA damage: implications for cancer therapy. J Biomed Biotechnol 2012; 2012:170325. [PMID: 22911014 PMCID: PMC3403320 DOI: 10.1155/2012/170325] [Citation(s) in RCA: 176] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2012] [Accepted: 04/17/2012] [Indexed: 02/06/2023] Open
Abstract
Activation of the p53 signaling pathway by DNA-damaging agents was originally proposed to result either in cell cycle checkpoint activation to promote survival or in apoptotic cell death. This model provided the impetus for numerous studies focusing on the development of p53-based cancer therapies. According to recent evidence, however, most p53 wild-type human cell types respond to ionizing radiation by undergoing stress-induced premature senescence (SIPS) and not apoptosis. SIPS is a sustained growth-arrested state in which cells remain viable and secrete factors that may promote cancer growth and progression. The p21(WAF1) (hereafter p21) protein has emerged as a key player in the p53 pathway. In addition to its well-studied role in cell cycle checkpoints, p21 regulates p53 and its upstream kinase (ATM), controls gene expression, suppresses apoptosis, and induces SIPS. Herein, we review these and related findings with human solid tumor-derived cell lines, report new data demonstrating dynamic behaviors of p53 and p21 in the DNA damage response, and examine the gain-of-function properties of cancer-associated p53 mutations. We point out obstacles in cancer-therapeutic strategies that are aimed at reactivating the wild-type p53 function and highlight some alternative approaches that target the apoptotic threshold in cancer cells with differing p53 status.
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48
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Gu B, Zhu WG. Surf the post-translational modification network of p53 regulation. Int J Biol Sci 2012; 8:672-84. [PMID: 22606048 PMCID: PMC3354625 DOI: 10.7150/ijbs.4283] [Citation(s) in RCA: 164] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2012] [Accepted: 05/07/2012] [Indexed: 02/07/2023] Open
Abstract
Among the human genome, p53 is one of the first tumor suppressor genes to be discovered. It has a wide range of functions covering cell cycle control, apoptosis, genome integrity maintenance, metabolism, fertility, cellular reprogramming and autophagy. Although different possible underlying mechanisms for p53 regulation have been proposed for decades, none of them is conclusive. While much literature focuses on the importance of individual post-translational modifications, further explorations indicate a new layer of p53 coordination through the interplay of the modifications, which builds up a complex 'network'. This review focuses on the necessity, characteristics and mechanisms of the crosstalk among post-translational modifications and its effects on the precise and selective behavior of p53.
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Affiliation(s)
- Bo Gu
- Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education), Department of Biochemistry and Molecular Biology, Peking University Health Science Center, Beijing 100191, China
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Boyd MT, Vlatkovic N, Rubbi CP. The nucleolus directly regulates p53 export and degradation. ACTA ACUST UNITED AC 2012; 194:689-703. [PMID: 21893597 PMCID: PMC3171122 DOI: 10.1083/jcb.201105143] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Nucleoli directly regulate p53 export and degradation rather than simply sequestering p53 regulatory factors. The correlation between stress-induced nucleolar disruption and abrogation of p53 degradation is evident after a wide variety of cellular stresses. This link may be caused by steps in p53 regulation occurring in nucleoli, as suggested by some biochemical evidence. Alternatively, nucleolar disruption also causes redistribution of nucleolar proteins, potentially altering their interactions with p53 and/or MDM2. This raises the fundamental question of whether the nucleolus controls p53 directly, i.e., as a site where p53 regulatory processes occur, or indirectly, i.e., by determining the cellular localization of p53/MDM2-interacting factors. In this work, transport experiments based on heterokaryons, photobleaching, and micronucleation demonstrate that p53 regulatory events are directly regulated by nucleoli and are dependent on intact nucleolar structure and function. Subcellular fractionation and nucleolar isolation revealed a distribution of ubiquitylated p53 that supports these findings. In addition, our results indicate that p53 is exported by two pathways: one stress sensitive and one stress insensitive, the latter being regulated by activities present in the nucleolus.
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Affiliation(s)
- Mark T Boyd
- p53/MDM2 Research Group, Department of Molecular and Clinical Cancer Medicine, University of Liverpool, Liverpool L69 3GA, England, UK
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CMIELOVÁ J, HAVELEK R, JIROUTOVÁ A, KOHLEROVÁ R, SEIFRTOVÁ M, MUTHNÁ D, VÁVROVÁ J, ŘEZÁČOVÁ M. DNA Damage Caused by Ionizing Radiation in Embryonic Diploid Fibroblasts WI-38 Induces Both Apoptosis and Senescence. Physiol Res 2011; 60:667-77. [DOI: 10.33549/physiolres.932083] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Cellular response to ionizing radiation-induced damage depends on the cell type and the ability to repair DNA damage. Some types of cells undergo apoptosis, whereas others induce a permanent cell cycle arrest and do not proliferate. Our study demonstrates two types of response of embryonic diploid fibroblasts WI-38 to ionizing radiation. In the WI-38 cells p53 is activated, protein p21 increases, but the cells are arrested in G2 phase of cell cycle. Some of the cells die by apoptosis, but in remaining viable cells p16 increases, senescence associated DNA-damage foci occur, and senescence-associated beta-galactosidase activity increases, which indicate stress-induced premature senescence.
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Affiliation(s)
- J. CMIELOVÁ
- Department of Medical Biochemistry, Faculty of Medicine in Hradec Králové, Charles University in Prague, Czech Republic
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