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Simón-Carrasco L, Pietrini E, López-Contreras AJ. Integrated analysis of FHIT gene alterations in cancer. Cell Cycle 2024; 23:92-113. [PMID: 38234243 PMCID: PMC11005815 DOI: 10.1080/15384101.2024.2304509] [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: 08/16/2023] [Accepted: 01/08/2024] [Indexed: 01/19/2024] Open
Abstract
The Fragile Histidine Triad Diadenosine Triphosphatase (FHIT) gene is located in the Common Fragile Site FRA3B and encodes an enzyme that hydrolyzes the dinucleotide Ap3A. Although FHIT loss is one of the most frequent copy number alterations in cancer, its relevance for cancer initiation and progression remains unclear. FHIT is frequently lost in cancers from the digestive tract, which is compatible with being a cancer driver event in these tissues. However, FHIT loss could also be a passenger event due to the inherent fragility of the FRA3B locus. Moreover, the physiological relevance of FHIT enzymatic activity and the levels of Ap3A is largely unclear. We have conducted here a systematic pan-cancer analysis of FHIT status in connection with other mutations and phenotypic alterations, and we have critically discussed our findings in connection with the literature to provide an overall view of FHIT implications in cancer.
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Affiliation(s)
- Lucía Simón-Carrasco
- Centro Andaluz de Biología Molecular y Medicina Regenerativa (CABIMER), Consejo Superior de Investigaciones Científicas (CSIC) - Universidad de Sevilla - Universidad Pablo de Olavide, Seville, Spain
| | - Elena Pietrini
- Centro Andaluz de Biología Molecular y Medicina Regenerativa (CABIMER), Consejo Superior de Investigaciones Científicas (CSIC) - Universidad de Sevilla - Universidad Pablo de Olavide, Seville, Spain
| | - Andrés J. López-Contreras
- Centro Andaluz de Biología Molecular y Medicina Regenerativa (CABIMER), Consejo Superior de Investigaciones Científicas (CSIC) - Universidad de Sevilla - Universidad Pablo de Olavide, Seville, Spain
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2
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Alsufyani D, Lindesay J. Evidence of cancer-linked rodent zoonoses from biophysical genomic variations. Sci Rep 2023; 13:13969. [PMID: 37634038 PMCID: PMC10460378 DOI: 10.1038/s41598-023-41257-4] [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: 11/11/2022] [Accepted: 08/23/2023] [Indexed: 08/28/2023] Open
Abstract
As a mechanism to explore the role of environmental adaptation in establishing the optimal distribution of single nucleotide polymophisms (SNPs) within resident homeostatic populations, relationships between quantified environmental parameters and the frequencies of the variants are being explored. We have performed sequential double-blind scans on more than 30% of chromosome 3 in an attempt to discover possible relationships using simple mathematical functions that are indicative of "adaptive forces" on the variants due to specific quantified environmental agents. We have found an association of rs13071758 with rodent zoonotic diseases. This variant is within the FHIT gene, which spans the most fragile of the common fragile sites in human lymphoblasts. FHIT, which is highly sensitive to environmental carcinogens, is partially lost in most human cancers. This finding is consistent with other studies postulating an association between rodent zoonoses and cancer. We quantify the adaptive force on the T allele as 0.28 GEUs per unit of zoonotic rodent host richness.
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Affiliation(s)
- Daniah Alsufyani
- College of Sciences and Health Professions, King Saud Bin Abdulaziz University for Health Sciences, Jeddah, Saudi Arabia.
- King Abdullah International Medical Research Center, Jeddah, Saudi Arabia.
| | - James Lindesay
- Computational Physics Laboratory, Department of Physics, Howard University, 2355 Sixth Street NW, Washington, DC, USA
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3
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Jotzo M, Zouboulis CC, Ballhausen WG. [Epigenetic changes in the promoter of the fragile histidine triad (FHIT) gene in human sebocytes under the influence of in vitro culture]. Ophthalmologe 2022; 119:813-819. [PMID: 35254487 DOI: 10.1007/s00347-022-01593-8] [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: 09/10/2021] [Revised: 01/05/2022] [Accepted: 02/01/2022] [Indexed: 11/25/2022]
Abstract
BACKGROUND Due to the lack of tumor suppressor function of the fragile histidine triad (FHIT) gene product, sebaceous gland carcinomas can develop. OBJECTIVE The model of the sebocyte cell line SZ95 was used to identify methylated CpG islands at the 5'-end of the FHIT gene and the decrease of gene expression as well as the increase of double-stranded (ds) DNA breaks were examined. MATERIAL AND METHODS Methylation, immunofluorescence analysis, promotor sequencing and treatment of SZ95 cells with 5‑azacytidine/trichostatin A (TSA). RESULTS The cultivation was accompanied by an increasing methylation of the CpG islands, a decrease of the FHIT gene expression and an accumulation of ds-DNA breaks. Treatment with 5‑azacytidine/TSA showed a decrease in DNA methylation and a re-expression of FHIT transcripts. DISCUSSION Epigenetic changes in the cellular genome are caused by in vitro cell culture. Consequently, a positive selection of sebocytes with an epigenetically inactivated FHIT locus occurs.
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Affiliation(s)
- Magdalena Jotzo
- Institut für Molekulare Medizin, Medizinische Fakultät, MLU Halle-Wittenberg, Kurt-Mothes Str. 3a, 06120, Halle (Saale), Deutschland
- Augentagesklinik Cottbus, An der Priormühle 14, 03050, Cottbus, Deutschland
| | - Christos C Zouboulis
- Hochschulklinik für Dermatologie, Venerologie und Allergologie, Immunologisches Zentrum, Städtisches Klinikum Dessau, Medizinische Hochschule Brandenburg Theodor Fontane, Dessau, Deutschland
| | - Wolfgang G Ballhausen
- Institut für Molekulare Medizin, Sektion Molekulare Onkologie, MLU Halle-Wittenberg, Kurt-Mothes Str. 3a, 06120, Halle (Saale), Deutschland.
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4
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Changes in Methylation Patterns of Tumor Suppressor Genes during Extended Human Embryonic Stem Cell Cultures. Stem Cells Int 2021; 2021:5575185. [PMID: 34552632 PMCID: PMC8452414 DOI: 10.1155/2021/5575185] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2021] [Revised: 08/11/2021] [Accepted: 08/18/2021] [Indexed: 11/23/2022] Open
Abstract
While studies on embryonic stem cells have been actively conducted, little is known about the epigenetic mechanisms in human embryonic stem cells (hESCs) in extended culture systems. Here, we investigated whether CpG island (CGI) methylation patterns of 24 tumor suppressor genes could be maintained during extended hESC cultures. In total, 10 hESC lines were analyzed. For each cell line, genomic DNA was extracted from early and late passages of cell cultures. CGI methylation levels of 24 tumor suppressor genes were analyzed using methylation-specific multiplex ligation-dependent probe amplification (MS-MLPA), pyrosequencing, and real-time polymerase chain reaction (PCR). Different CGI methylation patterns of CASP8, FHIT, and CHFR genes were identified in between early and late passages in some hESC lines. CGI methylation levels of CASP8 significantly increased at late passage in CHA-36, CHA-40, and CHA-42 cell lines compared to those at early passage. The CGI methylation of the FHIT gene was higher at late passage than at early passage in CHA-15, CHA-31, CHA-32, and iPS (FS)-1 cell lines but decreased at the late passage in CHA-20 and H1 cell lines. Different CGI methylation patterns were detected for the CHFR gene only in iPS (FS)-1, and the level significantly increased at late passage. Thus, our findings show that CGI methylation patterns could be altered during prolonged ESC cultures and examining these epigenetic changes is important to assess the maintenance, differentiation, and clinical usage of stem cells.
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Kawaguchi M, Sekimoto E, Ohta Y, Ieda N, Murakami T, Nakagawa H. Synthesis of Fluorescent Probes Targeting Tumor-Suppressor Protein FHIT and Identification of Apoptosis-Inducing FHIT Inhibitors. J Med Chem 2021; 64:9567-9576. [PMID: 34160227 DOI: 10.1021/acs.jmedchem.1c00874] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
For the early diagnosis of cancer, leading to a better chance of full recovery, marker genes whose expression is already altered in precancerous lesions are desirable, and the tumor-suppressor gene FHIT is one candidate. The gene product, FHIT protein, has a unique dinucleoside triphosphate hydrolase (AP3Aase) activity, and in this study, we designed and synthesized a series of FHIT fluorescent probes utilizing this activity. We optimized the probe structure for high and specific reactivity with FHIT and applied the optimized probe in a screening assay for FHIT inhibitors. Screening of a compound library with this assay identified several hits. Structural development of a hit compound afforded potent FHIT inhibitors. These inhibitors induce apoptosis in FHIT-expressing cancers via caspase activation. Our results support the idea that FHIT binders, no matter whether inhibitors or agonists of AP3Aase activity, might be promising anticancer agents.
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Affiliation(s)
- Mitsuyasu Kawaguchi
- Graduate School of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabe-dori, Mizuho-ku, Nagoya, Aichi 467-8603, Japan
| | - Eriko Sekimoto
- Graduate School of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabe-dori, Mizuho-ku, Nagoya, Aichi 467-8603, Japan
| | - Yuhei Ohta
- Graduate School of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabe-dori, Mizuho-ku, Nagoya, Aichi 467-8603, Japan.,Faculty of Pharmaceutical Sciences, Sojo University, 4-22-1 Ikeda, Nishi-ku, Kumamoto 860-0082, Japan
| | - Naoya Ieda
- Graduate School of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabe-dori, Mizuho-ku, Nagoya, Aichi 467-8603, Japan
| | - Takashi Murakami
- Faculty of Medicine, Saitama Medical University, 38 Moro-hongo, Moroyama, Iruma, Saitama 350-0495, Japan
| | - Hidehiko Nakagawa
- Graduate School of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabe-dori, Mizuho-ku, Nagoya, Aichi 467-8603, Japan
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Kim TO, Park DI, Han YK, Kang K, Park SG, Park HR, Yi JM. Genome-Wide Analysis of the DNA Methylation Profile Identifies the Fragile Histidine Triad ( FHIT) Gene as a New Promising Biomarker of Crohn's Disease. J Clin Med 2020; 9:jcm9051338. [PMID: 32375395 PMCID: PMC7291297 DOI: 10.3390/jcm9051338] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2020] [Revised: 04/30/2020] [Accepted: 04/30/2020] [Indexed: 12/26/2022] Open
Abstract
Inflammatory bowel disease is known to be associated with a genetic predisposition involving multiple genes; however, there is growing evidence that abnormal interactions with environmental factors, particularly epigenetic factors, can also significantly contribute to the development of inflammatory bowel disease (IBD). Although many genome-wide association studies have been performed to identify the genetic changes underlying the pathogenesis of Crohn’s disease, the role of epigenetic alterations based on molecular complications arising from Crohn’s disease (CD) is poorly understood. We employed an unbiased approach to define DNA methylation alterations in colonoscopy samples from patients with CD using the HumanMethylation450K BeadChip platform. Technical and functional validation was performed by methylation-specific PCR (MSP) and bisulfite sequencing of a validation set of 207 patients with CD samples. Immunohistochemistry (IHC) analysis was performed in the representative sample sets. DNA methylation profile in CD revealed that 135 probes (24 hypermethylated and 111 hypomethylated probes) were differentially methylated. We validated the methylation levels of 19 genes that showed hypermethylation in patients with CD compared with normal controls. We uniquely identified that the fragile histidine triad (FHIT) gene was hypermethylated in a disease-specific manner and its protein level was downregulated in patients with CD. Pathway analysis of the hypermethylated candidates further suggested putative molecular interactions relevant to IBD pathology. Our data provide information on the biological and clinical implications of DNA hypermethylated genes in CD, identifying FHIT methylation as a promising new biomarker for CD. Further study of the role of FHIT in IBD pathogenesis may lead to the development of new therapeutic targets.
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Affiliation(s)
- Tae-Oh Kim
- Department of Internal Medicine, Inje University, Haeundae Paik Hospital, Busan 48108, Korea;
| | - Dong-Il Park
- Department of Internal Medicine, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul 03181, Korea;
| | - Yu Kyeong Han
- Department of Microbiology and Immunology, College of Medicine, Inje University, Busan 47392, Korea; (Y.K.H.); (S.-G.P.)
| | - Keunsoo Kang
- Department of Microbiology, Dankook University, Cheonan 31116, Korea;
| | - Sae-Gwang Park
- Department of Microbiology and Immunology, College of Medicine, Inje University, Busan 47392, Korea; (Y.K.H.); (S.-G.P.)
| | - Hae Ryoun Park
- Department of Oral Pathology, School of Dentistry, Pusan National University, Yangsan, Gyeongsangnam do 50612, Korea;
| | - Joo Mi Yi
- Department of Microbiology and Immunology, College of Medicine, Inje University, Busan 47392, Korea; (Y.K.H.); (S.-G.P.)
- Correspondence: ; Tel.: +82-51-890-6734
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7
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Sjölander JJ, Sunnerhagen P. The fission yeast FHIT homolog affects checkpoint control of proliferation and is regulated by mitochondrial electron transport. Cell Biol Int 2019; 44:412-423. [PMID: 31538680 PMCID: PMC7003880 DOI: 10.1002/cbin.11241] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2019] [Accepted: 09/15/2019] [Indexed: 11/08/2022]
Abstract
Genetic analysis has strongly implicated human FHIT (Fragile Histidine Triad) as a tumor suppressor gene, being mutated in a large proportion of early‐stage cancers. The functions of the FHIT protein have, however, remained elusive. Here, we investigated aph1+, the fission yeast homolog of FHIT, for functions related to checkpoint control and oxidative metabolism. In sublethal concentrations of DNA damaging agents, aph1Δ mutants grew with a substantially shorter lag phase. In aph1Δ mutants carrying a hypomorphic allele of cds1 (the fission yeast homolog of Chk2), in addition, increased chromosome fragmentation and missegregation were found. We also found that under hypoxia or impaired electron transport function, the Aph1 protein level was strongly depressed. Previously, FHIT has been linked to regulation of the human 9‐1‐1 checkpoint complex constituted by Hus1, Rad1, and Rad9. In Schizosaccharomyces pombe, the levels of all three 9‐1‐1 proteins are all downregulated by hypoxia in similarity with Aph1. Moreover, deletion of the aph1+ gene reduced the Rad1 protein level, indicating a direct relationship between these two proteins. We conclude that the fission yeast FHIT homolog has a role in modulating DNA damage checkpoint function, possibly through an effect on the 9‐1‐1 complex, and that this effect may be critical under conditions of limiting oxidative metabolism and reoxygenation.
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Affiliation(s)
- Johanna J Sjölander
- Department of Chemistry and Molecular Biology, Lundberg Laboratory, University of Gothenburg, P.O. Box 462, Göteborg, SE-405 30, Sweden
| | - Per Sunnerhagen
- Department of Chemistry and Molecular Biology, Lundberg Laboratory, University of Gothenburg, P.O. Box 462, Göteborg, SE-405 30, Sweden
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8
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Hashimoto Y, Shiina M, Dasgupta P, Kulkarni P, Kato T, Wong RK, Tanaka Y, Shahryari V, Maekawa S, Yamamura S, Saini S, Deng G, Tabatabai ZL, Majid S, Dahiya R. Upregulation of miR-130b Contributes to Risk of Poor Prognosis and Racial Disparity in African-American Prostate Cancer. Cancer Prev Res (Phila) 2019; 12:585-598. [PMID: 31266828 DOI: 10.1158/1940-6207.capr-18-0509] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2018] [Revised: 05/23/2019] [Accepted: 06/24/2019] [Indexed: 12/18/2022]
Abstract
Prostate cancer incidence and mortality rates are higher in African-American (AA) than in European-American (EA) men. The main objective of this study was to elucidate the role of miR-130b as a contributor to prostate cancer health disparity in AA patients. We also determined whether miR-130b is a prognostic biomarker and a new therapeutic candidate for AA prostate cancer. A comprehensive approach of using cell lines, tissue samples, and the TCGA database was employed. We performed a series of functional assays such as cell proliferation, migration, invasion, RT2-PCR array, qRT-PCR, cell cycle, luciferase reporter, immunoblot, and IHC. Various statistical approaches such as Kaplan-Meier, uni-, and multivariate analyses were utilized to determine the clinical significance of miR-130b. Our results showed that elevated levels of miR-130b correlated with race disparity and PSA levels/failure and acted as an independent prognostic biomarker for AA patients. Two tumor suppressor genes, CDKN1B and FHIT, were validated as direct functional targets of miR-130b. We also found race-specific cell-cycle pathway activation in AA patients with prostate cancer. Functionally, miR-130b inhibition reduced cell proliferation, colony formation, migration/invasion, and induced cell-cycle arrest. Inhibition of miR-130b modulated critical prostate cancer-related biological pathways in AA compared with EA prostate cancer patients. In conclusion, attenuation of miR-130b expression has tumor suppressor effects in AA prostate cancer. miR-130b is a significant contributor to prostate cancer racial disparity as its overexpression is a risk factor for poor prognosis in AA patients with prostate cancer. Thus, regulation of miR-130b may provide a novel therapeutic approach for the management of prostate cancer in AA patients.
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Affiliation(s)
- Yutaka Hashimoto
- Department of Urology, San Francisco VA Medical Center, San Francisco, California.,University of California San Francisco, San Francisco, California
| | - Marisa Shiina
- Department of Urology, San Francisco VA Medical Center, San Francisco, California.,University of California San Francisco, San Francisco, California
| | - Pritha Dasgupta
- Department of Urology, San Francisco VA Medical Center, San Francisco, California.,University of California San Francisco, San Francisco, California
| | - Priyanka Kulkarni
- Department of Urology, San Francisco VA Medical Center, San Francisco, California.,University of California San Francisco, San Francisco, California
| | - Taku Kato
- Department of Urology, San Francisco VA Medical Center, San Francisco, California.,University of California San Francisco, San Francisco, California
| | - Ryan K Wong
- Department of Urology, San Francisco VA Medical Center, San Francisco, California.,University of California San Francisco, San Francisco, California
| | - Yuichiro Tanaka
- Department of Urology, San Francisco VA Medical Center, San Francisco, California.,University of California San Francisco, San Francisco, California
| | - Varahram Shahryari
- Department of Urology, San Francisco VA Medical Center, San Francisco, California.,University of California San Francisco, San Francisco, California
| | - Shigekatsu Maekawa
- Department of Urology, San Francisco VA Medical Center, San Francisco, California.,University of California San Francisco, San Francisco, California
| | - Soichiro Yamamura
- Department of Urology, San Francisco VA Medical Center, San Francisco, California.,University of California San Francisco, San Francisco, California
| | - Sharanjot Saini
- Department of Urology, San Francisco VA Medical Center, San Francisco, California.,University of California San Francisco, San Francisco, California
| | - Guoren Deng
- Department of Urology, San Francisco VA Medical Center, San Francisco, California.,University of California San Francisco, San Francisco, California
| | - Z Laura Tabatabai
- Department of Pathology, San Francisco VA Medical Center, California.,University of California San Francisco, San Francisco, California
| | - Shahana Majid
- Department of Urology, San Francisco VA Medical Center, San Francisco, California. .,University of California San Francisco, San Francisco, California
| | - Rajvir Dahiya
- Department of Urology, San Francisco VA Medical Center, San Francisco, California. .,University of California San Francisco, San Francisco, California
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Druck T, Cheung DG, Park D, Trapasso F, Pichiorri F, Gaspari M, Palumbo T, Aqeilan RI, Gaudio E, Okumura H, Iuliano R, Raso C, Green K, Huebner K, Croce CM. Fhit-Fdxr interaction in the mitochondria: modulation of reactive oxygen species generation and apoptosis in cancer cells. Cell Death Dis 2019; 10:147. [PMID: 30770797 PMCID: PMC6377664 DOI: 10.1038/s41419-019-1414-7] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2019] [Accepted: 01/30/2019] [Indexed: 01/08/2023]
Abstract
Fhit protein is lost in cancers of most, perhaps all, cancer types; when restored, it can induce apoptosis and suppress tumorigenicity, as shown in vitro and in mouse tumor models in vivo. Following protein cross-linking and proteomics analyses, we characterized a Fhit protein complex involved in triggering Fhit-mediated apoptosis. The complex includes the heat-shock chaperonin pair, HSP60/10, which is likely involved in importing Fhit into the mitochondria, where it interacts with ferredoxin reductase, responsible for transferring electrons from NADPH to cytochrome P450 via ferredoxin, in electron transport chain complex III. Overexpression of Fhit protein in Fhit-deficient cancer cells modulates the production of intracellular reactive oxygen species, causing increased ROS, following peroxide treatment, with subsequent increased apoptosis of lung cancer cells under oxidative stress conditions; conversely, Fhit-negative cells escape ROS overproduction and ROS-induced apoptosis, likely carrying oxidative damage. Thus, characterization of Fhit-interacting proteins has identified direct effectors of a Fhit-mediated apoptotic signal pathway that is lost in many cancers. This is of translational interest considering the very recent emphasis in a number of high-profile publications, concerning the role of oxidative phosphorylation in the treatment of human cancers, and especially cancer stem cells that rely upon oxidative phosphorylation for survival. Additionally, we have shown that cells from a Fhit-deficient lung cancer cell line, are sensitive to killing by exposure to atovaquone, thought to act as a selective oxidative phosphorylation inhibitor by targeting the CoQ10 dependence of the mitochondrial complex III, while the Fhit-expressing sister clone is resistant to this treatment.
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Affiliation(s)
- Teresa Druck
- Department of Cancer Biology and Genetics, The Ohio State University Comprehensive Cancer Center, Columbus, OH, 43210, USA
| | - Douglas G Cheung
- Department of Cancer Biology and Genetics, The Ohio State University Comprehensive Cancer Center, Columbus, OH, 43210, USA
| | - Dongju Park
- Department of Cancer Biology and Genetics, The Ohio State University Comprehensive Cancer Center, Columbus, OH, 43210, USA
| | - Francesco Trapasso
- Dipartimento di Medicina Sperimentale e Clinica, University "Magna Græcia" of Catanzaro, Catanzaro, 88100, Italy
| | - Flavia Pichiorri
- Department of Hematologic Malignancies Translational Science, Beckman Research Institute, City of Hope, Duarte, CA, USA
| | - Marco Gaspari
- Dipartimento di Medicina Sperimentale e Clinica, University "Magna Græcia" of Catanzaro, Catanzaro, 88100, Italy
| | - Tiziana Palumbo
- Dipartimento di Farmacologia Sperimentale Preclinica e Clinica, University of Catania, Catania, 95123, Italy
| | - Rami I Aqeilan
- Department of Cancer Biology and Genetics, The Ohio State University Comprehensive Cancer Center, Columbus, OH, 43210, USA
- Lautenberg Center for Immunology and Cancer Research, Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel
| | - Eugenio Gaudio
- Università della Svizzera italiana, Institute of Oncology Research, Bellinzona, Switzerland
| | - Hiroshi Okumura
- Digestive Surgery, Breast and Thyroid Surgery, Graduate School of Medical Sciences, Kagoshima University, Sakuragaoka, Kagoshima, Japan
| | - Rodolfo Iuliano
- Dipartimento di Medicina Sperimentale e Clinica, University "Magna Græcia" of Catanzaro, Catanzaro, 88100, Italy
| | - Cinzia Raso
- Systems Biology Ireland, University College Dublin, Belfield, Dublin 4, Dublin, Ireland
| | - Kari Green
- Department of Chemistry, Mass Spectrometry Research and Education Center, University of Florida, 126 Sisler Hall, Gainesville, FL, 32611-7200, USA
| | - Kay Huebner
- Department of Cancer Biology and Genetics, The Ohio State University Comprehensive Cancer Center, Columbus, OH, 43210, USA
| | - Carlo M Croce
- Department of Cancer Biology and Genetics, The Ohio State University Comprehensive Cancer Center, Columbus, OH, 43210, USA.
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10
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Dannewitz Prosseda S, Tian X, Kuramoto K, Boehm M, Sudheendra D, Miyagawa K, Zhang F, Solow-Cordero D, Saldivar JC, Austin ED, Loyd JE, Wheeler L, Andruska A, Donato M, Wang L, Huebner K, Metzger RJ, Khatri P, Spiekerkoetter E. FHIT, a Novel Modifier Gene in Pulmonary Arterial Hypertension. Am J Respir Crit Care Med 2019; 199:83-98. [PMID: 30107138 PMCID: PMC6353016 DOI: 10.1164/rccm.201712-2553oc] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Accepted: 08/14/2018] [Indexed: 01/05/2023] Open
Abstract
RATIONALE Pulmonary arterial hypertension (PAH) is characterized by progressive narrowing of pulmonary arteries, resulting in right heart failure and death. BMPR2 (bone morphogenetic protein receptor type 2) mutations account for most familial PAH forms whereas reduced BMPR2 is present in many idiopathic PAH forms, suggesting dysfunctional BMPR2 signaling to be a key feature of PAH. Modulating BMPR2 signaling is therapeutically promising, yet how BMPR2 is downregulated in PAH is unclear. OBJECTIVES We intended to identify and pharmaceutically target BMPR2 modifier genes to improve PAH. METHODS We combined siRNA high-throughput screening of >20,000 genes with a multicohort analysis of publicly available PAH RNA expression data to identify clinically relevant BMPR2 modifiers. After confirming gene dysregulation in tissue from patients with PAH, we determined the functional roles of BMPR2 modifiers in vitro and tested the repurposed drug enzastaurin for its propensity to improve experimental pulmonary hypertension (PH). MEASUREMENTS AND MAIN RESULTS We discovered FHIT (fragile histidine triad) as a novel BMPR2 modifier. BMPR2 and FHIT expression were reduced in patients with PAH. FHIT reductions were associated with endothelial and smooth muscle cell dysfunction, rescued by enzastaurin through a dual mechanism: upregulation of FHIT as well as miR17-5 repression. Fhit-/- mice had exaggerated hypoxic PH and failed to recover in normoxia. Enzastaurin reversed PH in the Sugen5416/hypoxia/normoxia rat model, by improving right ventricular systolic pressure, right ventricular hypertrophy, cardiac fibrosis, and vascular remodeling. CONCLUSIONS This study highlights the importance of the novel BMPR2 modifier FHIT in PH and the clinical value of the repurposed drug enzastaurin as a potential novel therapeutic strategy to improve PAH.
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Affiliation(s)
- Svenja Dannewitz Prosseda
- Division of Pulmonary and Critical Care, Department of Medicine
- Wall Center for Pulmonary Vascular Disease
| | - Xuefei Tian
- Division of Pulmonary and Critical Care, Department of Medicine
- Wall Center for Pulmonary Vascular Disease
| | - Kazuya Kuramoto
- Division of Pulmonary and Critical Care, Department of Medicine
- Wall Center for Pulmonary Vascular Disease
| | - Mario Boehm
- Division of Pulmonary and Critical Care, Department of Medicine
- Wall Center for Pulmonary Vascular Disease
| | | | - Kazuya Miyagawa
- Wall Center for Pulmonary Vascular Disease
- Cardiovascular Institute
- Department of Pediatrics
| | - Fan Zhang
- Wall Center for Pulmonary Vascular Disease
| | | | | | - Eric D. Austin
- Vanderbilt University Medical Center, Nashville, Tennessee; and
| | - James E. Loyd
- Vanderbilt University Medical Center, Nashville, Tennessee; and
| | - Lisa Wheeler
- Vanderbilt University Medical Center, Nashville, Tennessee; and
| | - Adam Andruska
- Division of Pulmonary and Critical Care, Department of Medicine
| | - Michele Donato
- Biomedical Informatics Research–Institute for Immunity, Transplantation, and Infection, Stanford University, Stanford, California
| | - Lingli Wang
- Division of Pulmonary and Critical Care, Department of Medicine
- Wall Center for Pulmonary Vascular Disease
| | - Kay Huebner
- Molecular Genetics and Cancer Biology Program, Ohio State University, Columbus, Ohio
| | | | - Purvesh Khatri
- Biomedical Informatics Research–Institute for Immunity, Transplantation, and Infection, Stanford University, Stanford, California
| | - Edda Spiekerkoetter
- Division of Pulmonary and Critical Care, Department of Medicine
- Wall Center for Pulmonary Vascular Disease
- Cardiovascular Institute
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11
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Saldivar JC, Park D. Mechanisms shaping the mutational landscape of the FRA3B/FHIT-deficient cancer genome. Genes Chromosomes Cancer 2018; 58:317-323. [PMID: 30242938 DOI: 10.1002/gcc.22684] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2018] [Accepted: 09/16/2018] [Indexed: 12/20/2022] Open
Abstract
Genome instability is an enabling characteristic of cancer that facilitates the acquisition of oncogenic mutations that drive tumorigenesis. Underlying much of the instability in cancer is DNA replication stress, which causes both chromosome structural changes and single base-pair mutations. Common fragile sites are some of the earliest and most frequently altered loci in tumors. Notably, the fragile locus, FRA3B, lies within the fragile histidine triad (FHIT) gene, and consequently deletions within FHIT are common in cancer. We review the evidence in support of FHIT as a DNA caretaker and discuss the mechanism by which FHIT promotes genome stability. FHIT increases thymidine kinase 1 (TK1) translation to balance the deoxyribonucleotide triphosphates (dNTPs) for efficient DNA replication. Consequently, FHIT-loss causes replication stress, DNA breaks, aneuploidy, copy-number changes (CNCs), small insertions and deletions, and point mutations. Moreover, FHIT-loss-induced replication stress and DNA breaks cooperate with APOBEC3B overexpression to catalyze DNA hypermutation in cancer, as APOBEC family enzymes prefer single-stranded DNA (ssDNA) as substrates and ssDNA is enriched at sites of both replication stress and DNA breaks. Consistent with the frequent loss of FHIT across a broad spectrum of cancer types, FHIT-deficiency is highly associated with the ubiquitous, clock-like mutation signature 5 occurring in all cancer types thus far examined. The ongoing destabilization of the genome caused by FHIT loss underlies recurrent inactivation of tumor suppressors and activation of oncogenes. Considering that more than 50% of cancers are FHIT-deficient, we propose that FRA3B/FHIT fragility shapes the mutational landscape of cancer genomes.
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Affiliation(s)
- Joshua C Saldivar
- Department of Chemical and Systems Biology, Stanford University School of Medicine, Stanford, California
| | - Dongju Park
- Department of Cancer Biology and Genetics, The Ohio State University, Comprehensive Cancer Center, Columbus, Ohio
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12
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Flunkert J, Maierhofer A, Dittrich M, Müller T, Horvath S, Nanda I, Haaf T. Genetic and epigenetic changes in clonal descendants of irradiated human fibroblasts. Exp Cell Res 2018; 370:322-332. [PMID: 29964050 DOI: 10.1016/j.yexcr.2018.06.034] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2018] [Revised: 06/12/2018] [Accepted: 06/27/2018] [Indexed: 10/28/2022]
Abstract
To study delayed genetic and epigenetic radiation effects, which may trigger radiation-induced carcinogenesis, we have established single-cell clones from irradiated and non-irradiated primary human fibroblasts. Stable clones were endowed with the same karyotype in all analyzed metaphases after 20 population doublings (PDs), whereas unstable clones displayed mosaics of normal and abnormal karyotypes. To account for variation in radiation sensitivity, all experiments were performed with two different fibroblast strains. After a single X-ray dose of 2 Gy more than half of the irradiated clones exhibited radiation-induced genome instability (RIGI). Irradiated clones displayed an increased rate of loss of chromosome Y (LOY) and copy number variations (CNVs), compared to controls. CNV breakpoints clustered in specific chromosome regions, in particular 3p14.2 and 7q11.21, coinciding with common fragile sites. CNVs affecting the FHIT gene in FRA3B were observed in independent unstable clones and may drive RIGI. Bisulfite pyrosequencing of control clones and the respective primary culture revealed global hypomethylation of ALU, LINE-1, and alpha-satellite repeats as well as rDNA hypermethylation during in vitro ageing. Irradiated clones showed further reduced ALU and alpha-satellite methylation and increased rDNA methylation, compared to controls. Methylation arrays identified several hundred differentially methylated genes and several enriched pathways associated with in vitro ageing. Methylation changes in 259 genes and the MAP kinase signaling pathway were associated with delayed radiation effects (after 20 PDs). Collectively, our results suggest that both genetic (LOY and CNVs) and epigenetic changes occur in the progeny of exposed cells that were not damaged directly by irradiation, likely contributing to radiation-induced carcinogenesis. We did not observe epigenetic differences between stable and unstable irradiated clones. The fact that the DNA methylation (DNAm) age of clones derived from the same primary culture varied greatly suggests that DNAm age of a single cell (represented by a clone) can be quite different from the DNAm age of a tissue. We propose that DNAm age reflects the emergent property of a large number of individual cells whose respective DNAm ages can be highly variable.
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Affiliation(s)
- Julia Flunkert
- Institute of Human Genetics, Julius Maximilians University, 97074 Würzburg, Germany
| | - Anna Maierhofer
- Institute of Human Genetics, Julius Maximilians University, 97074 Würzburg, Germany
| | - Marcus Dittrich
- Institute of Human Genetics, Julius Maximilians University, 97074 Würzburg, Germany; Department of Bioinformatics, Julius Maximilians University, 97074 Würzburg, Germany
| | - Tobias Müller
- Department of Bioinformatics, Julius Maximilians University, 97074 Würzburg, Germany
| | - Steve Horvath
- Department of Human Genetics, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, CA 90095, USA
| | - Indrajit Nanda
- Institute of Human Genetics, Julius Maximilians University, 97074 Würzburg, Germany
| | - Thomas Haaf
- Institute of Human Genetics, Julius Maximilians University, 97074 Würzburg, Germany.
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13
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Geng X, Pu W, Tan Y, Lu Z, Wang A, Tan L, Chen S, Guo S, Wang J, Chen X. Quantitative assessment of the diagnostic role of FHIT promoter methylation in non-small cell lung cancer. Oncotarget 2018; 8:6845-6856. [PMID: 28036263 PMCID: PMC5351674 DOI: 10.18632/oncotarget.14256] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2016] [Accepted: 12/12/2016] [Indexed: 01/28/2023] Open
Abstract
Aberrant methylation of CpG islands acquired in promoter regions plays an important role in carcinogenesis. Accumulated evidence demonstrates FHIT gene promoter hyper-methylation is involved in non-small cell lung cancer (NSCLC). To test the diagnostic ability of FHIT methylation status on NSCLC, thirteen studies, including 2,119 samples were included in our meta-analysis. Simultaneously, four independent DNA methylation datasets from TCGA and GEO database were analyzed for validation. The pooled odds ratio of FHIT promoter methylation in cancer samples was 3.43 (95% CI: 1.85 to 6.36) compared with that in controls. In subgroup analysis, significant difference of FHIT gene promoter methylation status in NSCLC and controls was found in Asians but not in Caucasian population. In validation stage, 950 Caucasian samples, including 126 paired samples from TCGA, 568 cancer tissues and 256 normal controls from GEO database were analyzed, and all 8 CpG sites near the promoter region of FHIT gene were not significantly differentially methylated. Thus the diagnostic role of FHIT gene in the lung cancer may be relatively limited in the Caucasian population but useful in the Asians.
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Affiliation(s)
- Xin Geng
- Department of Cardiothoracic Surgery, Huashan Hospital, Fudan University, Shanghai 200032, China
| | - Weilin Pu
- State Key Laboratory of Genetic Engineering, Collaborative Innovation Center for Genetics and Development, School of Life Sciences, Fudan University, Shanghai 200433, China
| | - Yulong Tan
- Department of Cardiothoracic Surgery, Huashan Hospital, Fudan University, Shanghai 200032, China
| | - Zhouyi Lu
- Department of Chest Surgery, Shanghai Pulmonary Hospital, Shanghai 200433, China
| | - An Wang
- Department of Chest Surgery, Shanghai Pulmonary Hospital, Shanghai 200433, China
| | - Lixing Tan
- State Key Laboratory of Genetic Engineering, Collaborative Innovation Center for Genetics and Development, School of Life Sciences, Fudan University, Shanghai 200433, China
| | - Sidi Chen
- State Key Laboratory of Genetic Engineering, Collaborative Innovation Center for Genetics and Development, School of Life Sciences, Fudan University, Shanghai 200433, China
| | - Shicheng Guo
- Department of Bioengineering, University of California at San Diego, La Jolla, CA 92093, USA
| | - Jiucun Wang
- State Key Laboratory of Genetic Engineering, Collaborative Innovation Center for Genetics and Development, School of Life Sciences, Fudan University, Shanghai 200433, China
| | - Xiaofeng Chen
- Department of Cardiothoracic Surgery, Huashan Hospital, Fudan University, Shanghai 200032, China
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14
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The ubiquitous 'cancer mutational signature' 5 occurs specifically in cancers with deleted FHIT alleles. Oncotarget 2017; 8:102199-102211. [PMID: 29254236 PMCID: PMC5731946 DOI: 10.18632/oncotarget.22321] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2017] [Accepted: 10/25/2017] [Indexed: 01/22/2023] Open
Abstract
The FHIT gene is located at the fragile FRA3B locus where activation by carcinogen-induced and endogenous replication stress causes FHIT deletions even in normal cells over a lifetime. Our lab has shown that loss of FHIT expression causes genome instability and provides single-strand DNA substrates for APOBEC3B hypermutation, in line with evidence that FHIT locus deletions occur in many cancers. Based on these biological features, we hypothesized that FHIT loss drives development of COSMIC mutational signature 5 and here provide evidence, including data mining of >6,500 TCGA samples, that FHIT is the cancer-associated gene with copy number alterations correlating most significantly with signature 5 mutation rate. In addition, tissues of Fhit-deficient mice exhibit a mutational signature strongly resembling signature 5 (cosine similarity value = 0.89). We conclude that FHIT loss is a molecular determinant for signature 5 mutations, which occur in all cancer types early in cancer development, are clock-like, and accelerated by carcinogen exposure. Loss of FHIT caretaker function may be a predictive and preventive marker for cancer development.
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15
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Jahid S, Sun J, Gelincik O, Blecua P, Edelmann W, Kucherlapati R, Zhou K, Jasin M, Gümüş ZH, Lipkin SM. Inhibition of colorectal cancer genomic copy number alterations and chromosomal fragile site tumor suppressor FHIT and WWOX deletions by DNA mismatch repair. Oncotarget 2017; 8:71574-71586. [PMID: 29069730 PMCID: PMC5641073 DOI: 10.18632/oncotarget.17776] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2017] [Accepted: 04/24/2017] [Indexed: 01/15/2023] Open
Abstract
Homologous recombination (HR) enables precise DNA repair after DNA double strand breaks (DSBs) using identical sequence templates, whereas homeologous recombination (HeR) uses only partially homologous sequences. Homeologous recombination introduces mutations through gene conversion and genomic deletions through single-strand annealing (SSA). DNA mismatch repair (MMR) inhibits HeR, but the roles of mammalian MMR MutL homologues (MLH1, PMS2 and MLH3) proteins in HeR suppression are poorly characterized. Here, we demonstrate that mouse embryonic fibroblasts (MEFs) carrying Mlh1, Pms2, and Mlh3 mutations have higher HeR rates, by using 7,863 uniquely mapping paired direct repeat sequences (DRs) in the mouse genome as endogenous gene conversion and SSA reporters. Additionally, when DSBs are induced by gamma-radiation, Mlh1, Pms2 and Mlh3 mutant MEFs have higher DR copy number alterations (CNAs), including DR CNA hotspots previously identified in mouse MMR-deficient colorectal cancer (dMMR CRC). Analysis of The Cancer Genome Atlas CRC data revealed that dMMR CRCs have higher genome-wide DR HeR rates than MMR proficient CRCs, and that dMMR CRCs have deletion hotspots in tumor suppressors FHIT/WWOX at chromosomal fragile sites FRA3B and FRA16D (which have elevated DSB rates) flanked by paired homologous DRs and inverted repeats (IR). Overall, these data provide novel insights into the MMR-dependent HeR inhibition mechanism and its role in tumor suppression.
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Affiliation(s)
- Sohail Jahid
- Departments of Medicine and Genetic Medicine, Weill Cornell Medicine, 10021, NY, USA
| | - Jian Sun
- Departments of Medicine and Genetic Medicine, Weill Cornell Medicine, 10021, NY, USA
| | - Ozkan Gelincik
- Departments of Medicine and Genetic Medicine, Weill Cornell Medicine, 10021, NY, USA
| | - Pedro Blecua
- Division of Clinical Genetics, Memorial Sloan Kettering Cancer Center, 10065, NY, USA
| | - Winfried Edelmann
- Department of Cell Biology and Department of Genetics, Albert Einstein College of Medicine of Yeshiva University, 10461, NY, USA
| | - Raju Kucherlapati
- Department of Genetics, Harvard Medical School, 02115, Boston, MA, USA
| | - Kathy Zhou
- Department of Biostatistics and Epidemiology, Weill Cornell Medical College, 10021, NY, USA
| | - Maria Jasin
- Developmental Biology Program, Memorial Sloan Kettering Cancer Center, 10065, NY, USA
| | - Zeynep H Gümüş
- Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, 10029, NY, USA.,Icahn Institute for Genomics and Multiscale Biology, Icahn School of Medicine at Mount Sinai, 10029, NY, USA
| | - Steven M Lipkin
- Departments of Medicine and Genetic Medicine, Weill Cornell Medicine, 10021, NY, USA
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16
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Kiss DL, Waters CE, Ouda IM, Saldivar JC, Karras JR, Amin ZA, Mahrous S, Druck T, Bundschuh RA, Schoenberg DR, Huebner K. Identification of Fhit as a post-transcriptional effector of Thymidine Kinase 1 expression. BIOCHIMICA ET BIOPHYSICA ACTA-GENE REGULATORY MECHANISMS 2017; 1860:374-382. [PMID: 28093273 DOI: 10.1016/j.bbagrm.2017.01.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2016] [Revised: 01/09/2017] [Accepted: 01/12/2017] [Indexed: 11/30/2022]
Abstract
FHIT is a genome caretaker gene that is silenced in >50% of cancers. Loss of Fhit protein expression promotes accumulation of DNA damage, affects apoptosis and epithelial-mesenchymal transition, though molecular mechanisms underlying these alterations have not been fully elucidated. Initiation of genome instability directly follows Fhit loss and the associated reduced Thymidine Kinase 1 (TK1) protein expression. The effects on TK1 of Fhit knockdown and Fhit induction in the current study confirmed the role of Fhit in regulating TK1 expression. Changes in Fhit expression did not impact TK1 protein turnover or transcription from the TK1 promoter, nor steady-state levels of TK1 mRNA or turnover. Polysome profile analysis showed that up-regulated Fhit expression resulted in decreased TK1 RNA in non-translating messenger ribonucleoproteins and increased ribosome density on TK1 mRNA. Fhit does not bind RNA but its expression increased luciferase expression from a transgene bearing the TK1 5'-UTR. Fhit has been reported to act as a scavenger decapping enzyme, and a similar result with a mutant (H96) that binds but does not cleave nucleoside 5',5'-triphosphates suggests the impact on TK1 translation is due to its ability to modulate the intracellular level of cap-like molecules. Consistent with this, cells expressing Fhit mutants with reduced activity toward cap-like dinucleotides exhibit DNA damage resulting from TK1 deficiency, whereas cells expressing wild-type Fhit or the H96N mutant do not. The results have implications for the mechanism by which Fhit regulates TK1 mRNA, and more broadly, for its modulation of multiple functions as tumor suppressor/genome caretaker.
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Affiliation(s)
- Daniel L Kiss
- Center for RNA Biology, 484 West 12th Ave., Columbus, OH 43210 USA
- Department of Biological Chemistry and Pharmacology, The Ohio State University, 1060 Carmack Rd., Columbus, OH 43210 USA
| | - Catherine E Waters
- Department of Cancer Biology and Genetics, The Ohio State University, 460 West 12 Ave., Columbus, OH 43210 USA
| | - Iman M Ouda
- Department of Cancer Biology and Genetics, The Ohio State University, 460 West 12 Ave., Columbus, OH 43210 USA
- Department of Clinical Pathology, Faculty of Medicine, 2nd floor, Surgery Hospital, Zagazig University, Zagazig 44519, Egypt
| | - Joshua C Saldivar
- Department of Cancer Biology and Genetics, The Ohio State University, 460 West 12 Ave., Columbus, OH 43210 USA
| | - Jenna R Karras
- Department of Cancer Biology and Genetics, The Ohio State University, 460 West 12 Ave., Columbus, OH 43210 USA
| | - Zaynab A Amin
- Department of Cancer Biology and Genetics, The Ohio State University, 460 West 12 Ave., Columbus, OH 43210 USA
| | - Seham Mahrous
- Department of Clinical Pathology, Faculty of Medicine, 2nd floor, Surgery Hospital, Zagazig University, Zagazig 44519, Egypt
| | - Teresa Druck
- Department of Cancer Biology and Genetics, The Ohio State University, 460 West 12 Ave., Columbus, OH 43210 USA
| | - Ralf A Bundschuh
- Center for RNA Biology, 484 West 12th Ave., Columbus, OH 43210 USA
- Department of Physics, Department of Chemistry and Biochemistry, and Division of Hematology, Department of Internal Medicine, The Ohio State University, 191 West Woodruff Ave., Columbus, OH 43210 USA
| | - Daniel R Schoenberg
- Center for RNA Biology, 484 West 12th Ave., Columbus, OH 43210 USA
- Department of Biological Chemistry and Pharmacology, The Ohio State University, 1060 Carmack Rd., Columbus, OH 43210 USA
| | - Kay Huebner
- Department of Cancer Biology and Genetics, The Ohio State University, 460 West 12 Ave., Columbus, OH 43210 USA
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17
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Hazan I, Hofmann TG, Aqeilan RI. Tumor Suppressor Genes within Common Fragile Sites Are Active Players in the DNA Damage Response. PLoS Genet 2016; 12:e1006436. [PMID: 27977694 PMCID: PMC5157955 DOI: 10.1371/journal.pgen.1006436] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
The role of common fragile sites (CFSs) in cancer remains controversial. Two main views dominate the discussion: one suggests that CFS loci are hotspots of genomic instability leading to inactivation of genes encoded within them, while the other view proposes that CFSs are functional units and that loss of the encoded genes confers selective pressure, leading to cancer development. The latter view is supported by emerging evidence showing that expression of a given CFS is associated with genome integrity and that inactivation of CFS-resident tumor suppressor genes leads to dysregulation of the DNA damage response (DDR) and increased genomic instability. These two viewpoints of CFS function are not mutually exclusive but rather coexist; when breaks at CFSs are not repaired accurately, this can lead to deletions by which cells acquire growth advantage because of loss of tumor suppressor activities. Here, we review recent advances linking some CFS gene products with the DDR, genomic instability, and carcinogenesis and discuss how their inactivation might represent a selective advantage for cancer cells.
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Affiliation(s)
- Idit Hazan
- Lautenberg Center for Immunology and Cancer Research, IMRIC, Hebrew University-Hadassah Medical School, Jerusalem, Israel
| | - Thomas G. Hofmann
- Cellular Senescence Group, Department of Epigenetics, German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Rami I. Aqeilan
- Lautenberg Center for Immunology and Cancer Research, IMRIC, Hebrew University-Hadassah Medical School, Jerusalem, Israel
- Department of Cancer Biology and Genetics, The Ohio State University Wexner Medical Center, Columbus, Ohio, United States of America
- Department of Biochemistry, University of Vermont College of Medicine, Burlington, Vermont, United States of America
- * E-mail:
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18
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Ehrmann C, Schneider MR. Genetically modified laboratory mice with sebaceous glands abnormalities. Cell Mol Life Sci 2016; 73:4623-4642. [PMID: 27457558 PMCID: PMC11108334 DOI: 10.1007/s00018-016-2312-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Revised: 07/12/2016] [Accepted: 07/19/2016] [Indexed: 12/19/2022]
Abstract
Sebaceous glands (SG) are exocrine glands that release their product by holocrine secretion, meaning that the whole cell becomes a secretion following disruption of the membrane. SG may be found in association with a hair follicle, forming the pilosebaceous unit, or as modified SG at different body sites such as the eyelids (Meibomian glands) or the preputial glands. Depending on their location, SG fulfill a number of functions, including protection of the skin and fur, thermoregulation, formation of the tear lipid film, and pheromone-based communication. Accordingly, SG abnormalities are associated with several diseases such as acne, cicatricial alopecia, and dry eye disease. An increasing number of genetically modified laboratory mouse lines develop SG abnormalities, and their study may provide important clues regarding the molecular pathways regulating SG development, physiology, and pathology. Here, we summarize in tabulated form the available mouse lines with SG abnormalities and, focusing on selected examples, discuss the insights they provide into SG biology and pathology. We hope this survey will become a helpful information source for researchers with a primary interest in SG but also as for researchers from unrelated fields that are unexpectedly confronted with a SG phenotype in newly generated mouse lines.
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Affiliation(s)
- Carmen Ehrmann
- Institute of Molecular Animal Breeding and Biotechnology, Gene Center, LMU Munich, Feodor-Lynen-Str. 25, 81377, Munich, Germany
| | - Marlon R Schneider
- Institute of Molecular Animal Breeding and Biotechnology, Gene Center, LMU Munich, Feodor-Lynen-Str. 25, 81377, Munich, Germany.
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Gaudio E, Paduano F, Croce CM, Trapasso F. The Fhit protein: an opportunity to overcome chemoresistance. Aging (Albany NY) 2016; 8:3147-3150. [PMID: 27852977 PMCID: PMC5191891 DOI: 10.18632/aging.101123] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2016] [Accepted: 11/10/2016] [Indexed: 11/25/2022]
Affiliation(s)
- Eugenio Gaudio
- Department of Molecular Immunology, Virology and Medical Genetics, The Ohio State University, Columbus, OH, USA
- Lymphoma & Genomics Research Program, IOR Institute of Oncology Research, Bellinzona, Switzerland
- Dipartimento di Medicina Sperimentale e Clinica, University , Catanzaro, Italy
| | - Francesco Paduano
- Dipartimento di Medicina Sperimentale e Clinica, University , Catanzaro, Italy
- Tecnologica Research Institute, Biomedical Section, Crotone, Italy
| | - Carlo M Croce
- Department of Molecular Immunology, Virology and Medical Genetics, The Ohio State University, Columbus, OH, USA
| | - Francesco Trapasso
- Dipartimento di Medicina Sperimentale e Clinica, University , Catanzaro, Italy
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20
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Karras JR, Schrock MS, Batar B, Zhang J, La Perle K, Druck T, Huebner K. Fhit loss-associated initiation and progression of neoplasia in vitro. Cancer Sci 2016; 107:1590-1598. [PMID: 27513973 PMCID: PMC5132276 DOI: 10.1111/cas.13032] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2016] [Revised: 08/05/2016] [Accepted: 08/09/2016] [Indexed: 12/28/2022] Open
Abstract
The FHIT gene, encompassing an active common fragile site, FRA3B, is frequently silenced in preneoplasia and cancer, through gene rearrangement or methylation of regulatory sequences. Silencing of Fhit protein expression causes thymidine kinase 1 downregulation, resulting in dNTP imbalance, and spontaneous replication stress that leads to chromosomal aberrations, allele copy number variations, insertions/deletions, and single-base substitutions. Thus, Fhit, which is reduced in expression in the majority of human cancers, is a genome "caretaker" whose loss initiates genome instability in preneoplastic lesions. To follow the early genetic alterations and functional changes induced by Fhit loss that may recapitulate the neoplastic process in vitro, we established epithelial cell lines from kidney tissues of Fhit-/- and +/+ mouse pups early after weaning, and subjected cell cultures to nutritional and carcinogen stress, which +/+ cells did not survive. Through transcriptome profiling and protein expression analysis, we observed changes in the Trp53/p21 and survivin apoptotic pathways in -/- cells, and in expression of proteins involved in epithelial-mesenchymal transition. Some Fhit-deficient cell lines showed anchorage-independent colony formation and increased invasive capacity in vitro. Furthermore, cells of stressed Fhit-/- cell lines formed s.c. and metastatic tumors in nude mice. Collectively, we show that Fhit loss and subsequent thymidine kinase 1 inactivation, combined with selective pressures, leads to neoplasia-associated alterations in genes and gene expression patterns in vitro and in vivo.
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Affiliation(s)
- Jenna R. Karras
- Department of Cancer Biology and GeneticsOhio State University Wexner Medical CenterColumbusOhioUSA
| | - Morgan S. Schrock
- Department of Cancer Biology and GeneticsOhio State University Wexner Medical CenterColumbusOhioUSA
| | - Bahadir Batar
- Department of Cancer Biology and GeneticsOhio State University Wexner Medical CenterColumbusOhioUSA
| | - Jie Zhang
- Department of Biomedical InformaticsOhio State University Wexner Medical CenterColumbusOhioUSA
| | - Krista La Perle
- Department of Veterinary BiosciencesCollege of Veterinary MedicineOhio State UniversityColumbusOhioUSA
| | - Teresa Druck
- Department of Cancer Biology and GeneticsOhio State University Wexner Medical CenterColumbusOhioUSA
| | - Kay Huebner
- Department of Cancer Biology and GeneticsOhio State University Wexner Medical CenterColumbusOhioUSA
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21
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Haney SL, Upchurch GM, Opavska J, Klinkebiel D, Hlady RA, Roy S, Dutta S, Datta K, Opavsky R. Dnmt3a Is a Haploinsufficient Tumor Suppressor in CD8+ Peripheral T Cell Lymphoma. PLoS Genet 2016; 12:e1006334. [PMID: 27690235 PMCID: PMC5045215 DOI: 10.1371/journal.pgen.1006334] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2016] [Accepted: 08/31/2016] [Indexed: 12/29/2022] Open
Abstract
DNA methyltransferase 3A (DNMT3A) is an enzyme involved in DNA methylation that is frequently mutated in human hematologic malignancies. We have previously shown that inactivation of Dnmt3a in hematopoietic cells results in chronic lymphocytic leukemia in mice. Here we show that 12% of Dnmt3a-deficient mice develop CD8+ mature peripheral T cell lymphomas (PTCL) and 29% of mice are affected by both diseases. 10% of Dnmt3a+/- mice develop lymphomas, suggesting that Dnmt3a is a haploinsufficient tumor suppressor in PTCL. DNA methylation was deregulated genome-wide with 10-fold more hypo- than hypermethylated promoters and enhancers, demonstrating that hypomethylation is a major event in the development of PTCL. Hypomethylated promoters were enriched for binding sites of transcription factors AML1, NF-κB and OCT1, implying the transcription factors potential involvement in Dnmt3a-associated methylation. Whereas 71 hypomethylated genes showed an increased expression in PTCL, only 3 hypermethylated genes were silenced, suggesting that cancer-specific hypomethylation has broader effects on the transcriptome of cancer cells than hypermethylation. Interestingly, transcriptomes of Dnmt3a+/- and Dnmt3aΔ/Δ lymphomas were largely conserved and significantly overlapped with those of human tumors. Importantly, we observed downregulation of tumor suppressor p53 in Dnmt3a+/- and Dnmt3aΔ/Δ lymphomas as well as in pre-tumor thymocytes from 9 months old but not 6 weeks old Dnmt3a+/- tumor-free mice, suggesting that p53 downregulation is chronologically an intermediate event in tumorigenesis. Decrease in p53 is likely an important event in tumorigenesis because its overexpression inhibited proliferation in mouse PTCL cell lines, suggesting that low levels of p53 are important for tumor maintenance. Altogether, our data link the haploinsufficient tumor suppressor function of Dnmt3a in the prevention of mouse mature CD8+ PTCL indirectly to a bona fide tumor suppressor of T cell malignancies p53. Global deregulation of cytosine methylation is an epigenetic hallmark of hematologic malignancies that may promote tumorigenesis by silencing tumor suppressor genes, upregulating oncogenes, and inducing genomic instability. DNA methyltransferase 3a (DNMT3A) is one of the three catalytically active enzymes responsible for cytosine methylation and one of the most frequently mutated genes in myeloid and T cell malignancies. Its role in malignant hematopoiesis, however, remains poorly understood. Here we show that Dnmt3a is a haploinsufficient tumor suppressor in the prevention of peripheral T cell lymphomas in mice. Our molecular studies identified a large number of genes deregulated in the absence of Dnmt3a that may be putative drivers of oncogenesis. We also show that downregulation of the tumor suppressor p53 is an important event in the development of mouse T cell lymphomas. Thus, this study establishes a novel mouse model to elucidate how epigenetic deregulation of transcription contributes to the pathogenesis of T cell lymphomas.
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Affiliation(s)
- Staci L. Haney
- Department of Genetics, Cell Biology, and Anatomy, University of Nebraska Medical Center, Omaha, Nebraska, United States of America
| | - G. Michael Upchurch
- Eppley Institute for Research in Cancer and Allied Diseases, Fred and Pamela Buffett Cancer Center, University of Nebraska Medical Center, Omaha, Nebraska, United States of America
| | - Jana Opavska
- Eppley Institute for Research in Cancer and Allied Diseases, Fred and Pamela Buffett Cancer Center, University of Nebraska Medical Center, Omaha, Nebraska, United States of America
| | - David Klinkebiel
- Department of Biochemistry and Molecular Biology, University of Nebraska Medical Center, Omaha, Nebraska, United States of America
| | - Ryan A. Hlady
- Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, Minnesota, United States of America
| | - Sohini Roy
- Department of Biochemistry and Molecular Biology, University of Nebraska Medical Center, Omaha, Nebraska, United States of America
| | - Samikshan Dutta
- Department of Biochemistry and Molecular Biology, University of Nebraska Medical Center, Omaha, Nebraska, United States of America
| | - Kaustubh Datta
- Department of Biochemistry and Molecular Biology, University of Nebraska Medical Center, Omaha, Nebraska, United States of America
| | - Rene Opavsky
- Department of Genetics, Cell Biology, and Anatomy, University of Nebraska Medical Center, Omaha, Nebraska, United States of America
- Eppley Institute for Research in Cancer and Allied Diseases, Fred and Pamela Buffett Cancer Center, University of Nebraska Medical Center, Omaha, Nebraska, United States of America
- Center for Leukemia and Lymphoma Research, University of Nebraska Medical Center, Omaha, Nebraska, United States of America
- * E-mail:
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22
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Schrock MS, Karras JR, Guggenbiller MJ, Druck T, Batar B, Huebner K. Fhit and Wwox loss-associated genome instability: A genome caretaker one-two punch. Adv Biol Regul 2016; 63:167-176. [PMID: 27773744 DOI: 10.1016/j.jbior.2016.09.008] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2016] [Revised: 09/21/2016] [Accepted: 09/25/2016] [Indexed: 11/28/2022]
Abstract
Expression of Fhit and Wwox protein is frequently lost or reduced in many human cancers. In this report, we provide data that further characterizes the molecular consequences of Fhit loss in the initiation of DNA double-strand breaks (DSBs), and of Wwox loss in altered repair of DSBs. We show that loss of Fhit initiates mild genome instability in early passage mouse kidney cells, confirming that DNA damage associated with Fhit-deficiency is not limited to cancer cells. We also demonstrate that the cause of Fhit-deficient DSBs: thymidine deficiency-induced replication stress, can be resolved with thymidine supplementation in early passage mouse kidney cells before extensive genome instability occurs. As for consequences of Wwox loss in cancer, we show in a small panel of breast cancer cells and mouse embryonic fibroblasts that Wwox expression predicts response to radiation and mitomycin C, all agents that cause DSBs. In addition, loss of Wwox significantly reduced progression free survival in a cohort of ovarian cancer patients treated with platin-based chemotherapies. Finally, stratification of a cohort of squamous lung cancers by Fhit expression reveals that Wwox expression is significantly reduced in the low Fhit-expressing group, suggesting that loss of Fhit is quickly succeeded by loss of Wwox. We propose that Fhit and Wwox loss work synergistically in cancer progression and that DNA damage caused by Fhit could be targeted early in cancer initiation for prevention, while DNA damage caused by Wwox loss could be targeted later in cancer progression, particularly in cancers that develop resistance to genotoxic therapies.
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Affiliation(s)
- Morgan S Schrock
- Department of Cancer Biology and Genetics, The Ohio State University Wexner Medical Center, Columbus, OH, USA
| | - Jenna R Karras
- Department of Cancer Biology and Genetics, The Ohio State University Wexner Medical Center, Columbus, OH, USA
| | - Matthew J Guggenbiller
- Department of Cancer Biology and Genetics, The Ohio State University Wexner Medical Center, Columbus, OH, USA
| | - Teresa Druck
- Department of Cancer Biology and Genetics, The Ohio State University Wexner Medical Center, Columbus, OH, USA
| | - Bahadir Batar
- Department of Cancer Biology and Genetics, The Ohio State University Wexner Medical Center, Columbus, OH, USA
| | - Kay Huebner
- Department of Cancer Biology and Genetics, The Ohio State University Wexner Medical Center, Columbus, OH, USA.
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23
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Sun J, Shen R, Schrock MS, Liu J, Pan X, Quimby D, Zanesi N, Druck T, Fong LY, Huebner K. Reduction in squamous cell carcinomas in mouse skin by dietary zinc supplementation. Cancer Med 2016; 5:2032-42. [PMID: 27185213 PMCID: PMC4873604 DOI: 10.1002/cam4.768] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2016] [Revised: 04/12/2016] [Accepted: 04/21/2016] [Indexed: 11/10/2022] Open
Abstract
Inadequate dietary Zn consumption increases susceptibility to esophageal and other cancers in humans and model organisms. Since Zn supplementation can prevent cancers in rodent squamous cell carcinoma (SCC) models, we were interested in determining if it could have a preventive effect in a rodent skin cancer model, as a preclinical basis for considering a role for Zn in prevention of human nonmelanoma skin cancers, the most frequent cancers in humans. We used the 7,12-dimethyl benzanthracene carcinogen/phorbol myristate acetate tumor promoter treatment method to induce skin tumors in Zn-sufficient wild-type and Fhit (human or mouse protein) knockout mice. Fhit protein expression is lost in >50% of human cancers, including skin SCCs, and Fhit-deficient mice show increased sensitivity to carcinogen induction of tumors. We hypothesized that: (1) the skin cancer burdens would be reduced by Zn supplementation; (2) Fhit(-/-) (Fhit, murine fragile histidine triad gene) mice would show increased susceptibility to skin tumor induction versus wild-type mice. 30 weeks after initiating treatment, the tumor burden was increased ~2-fold in Fhit(-/-) versus wild-type mice (16.2 versus 7.6 tumors, P < 0.001); Zn supplementation significantly reduced tumor burdens in Fhit(-/-) mice (males and females combined, 16.2 unsupplemented versus 10.3 supplemented, P = 0.001). Most importantly, the SCC burden was reduced after Zn supplementation in both strains and genders of mice, most significantly in the wild-type males (P = 0.035). Although the mechanism(s) of action of Zn supplementation in skin tumor prevention is not known in detail, the Zn-supplemented tumors showed evidence of reduced DNA damage and some cohorts showed reduced inflammation scores. The results suggest that mild Zn supplementation should be tested for prevention of skin cancer in high-risk human cohorts.
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Affiliation(s)
- Jin Sun
- Department of Molecular Virology, Immunology and Medical GeneticsThe Ohio State University Comprehensive Cancer CenterColumbusOhio
- Present address: Department of PathologyMolecular PathologyThe Ohio State University Wexner Medical CenterColumbusOhio
| | - Rulong Shen
- Department of PathologyCollege of MedicineColumbusOhio
| | - Morgan S. Schrock
- Department of Molecular Virology, Immunology and Medical GeneticsThe Ohio State University Comprehensive Cancer CenterColumbusOhio
- Biomedical Sciences Graduate ProgramColumbusOhio
| | - James Liu
- Department of Molecular Virology, Immunology and Medical GeneticsThe Ohio State University Comprehensive Cancer CenterColumbusOhio
- Present address: Beaumont‐Oakland University Medical SchoolGrosse PointeMichigan
| | - Xueliang Pan
- Department of Biomedical InformaticsCenter for BiostatisticsThe Ohio State UniversityColumbusOhio
| | - Donald Quimby
- Department of Molecular Virology, Immunology and Medical GeneticsThe Ohio State University Comprehensive Cancer CenterColumbusOhio
- Present address: University of CincinnatiDepartment of Internal MedicineCincinnatiOhio
| | - Nicola Zanesi
- Department of Molecular Virology, Immunology and Medical GeneticsThe Ohio State University Comprehensive Cancer CenterColumbusOhio
| | - Teresa Druck
- Department of Molecular Virology, Immunology and Medical GeneticsThe Ohio State University Comprehensive Cancer CenterColumbusOhio
| | - Louise Y. Fong
- Department of Pathology, Anatomy & Cell BiologySidney Kimmel Cancer CenterThomas Jefferson UniversityPhiladelphiaPennsylvania
| | - Kay Huebner
- Department of Molecular Virology, Immunology and Medical GeneticsThe Ohio State University Comprehensive Cancer CenterColumbusOhio
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Paisie CA, Schrock MS, Karras JR, Zhang J, Miuma S, Ouda IM, Waters CE, Saldivar JC, Druck T, Huebner K. Exome-wide single-base substitutions in tissues and derived cell lines of the constitutive Fhit knockout mouse. Cancer Sci 2016; 107:528-35. [PMID: 26782170 PMCID: PMC4832848 DOI: 10.1111/cas.12887] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2015] [Revised: 01/07/2016] [Accepted: 01/11/2016] [Indexed: 02/03/2023] Open
Abstract
Loss of expression of Fhit, a tumor suppressor and genome caretaker, occurs in preneoplastic lesions during development of many human cancers. Furthermore, Fhit-deficient mouse models are exquisitely susceptible to carcinogen induction of cancers of the lung and forestomach. Due to absence of Fhit genome caretaker function, cultured cells and tissues of the constitutive Fhit knockout strain develop chromosome aneuploidy and allele copy number gains and losses and we hypothesized that Fhit-deficient cells would also develop point mutations. On analysis of whole exome sequences of Fhit-deficient tissues and cultured cells, we found 300 to >1000 single-base substitutions associated with Fhit loss in the 2% of the genome included in exomes, relative to the C57Bl6 reference genome. The mutation signature is characterized by increased C>T and T>C mutations, similar to the "age at diagnosis" signature identified in human cancers. The Fhit-deficiency mutation signature also resembles a C>T and T>C mutation signature reported for human papillary kidney cancers and a similar signature recently reported for esophageal and bladder cancers, cancers that are frequently Fhit deficient. The increase in T>C mutations in -/- exomes may be due to dNTP imbalance, particularly in thymidine triphosphate, resulting from decreased expression of thymidine kinase 1 in Fhit-deficient cells. Fhit-deficient kidney cells that survived in vitro dimethylbenz(a)anthracene treatment additionally showed increased T>A mutations, a signature generated by treatment with this carcinogen, suggesting that these T>A transversions may be evidence of carcinogen-induced preneoplastic changes.
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Affiliation(s)
- Carolyn A. Paisie
- Department of Molecular Virology, Immunology and Medical GeneticsColumbusOhioUSA
- Present address: The Center for Infectious Disease ResearchSeattleWashingtonUSA
| | - Morgan S. Schrock
- Department of Molecular Virology, Immunology and Medical GeneticsColumbusOhioUSA
| | - Jenna R. Karras
- Department of Molecular Virology, Immunology and Medical GeneticsColumbusOhioUSA
| | - Jie Zhang
- Department of Biomedical InformaticsThe Ohio State University Wexner Medical CenterColumbusOhioUSA
| | - Satoshi Miuma
- Department of Gastroenterology and HepatologyGraduate School of Biomedical SciencesNagasaki UniversityNagasakiJapan
| | - Iman M. Ouda
- Department of Molecular Virology, Immunology and Medical GeneticsColumbusOhioUSA
| | - Catherine E. Waters
- Department of Molecular Virology, Immunology and Medical GeneticsColumbusOhioUSA
- Present address: Department of BiochemistryMolecular Biology and Biophysics Institute for Molecular VirologyUniversity of MinnesotaMinneapolisMinnesotaUSA
| | - Joshua C. Saldivar
- Department of Chemical and Systems BiologyStanford University School of MedicineStanfordCaliforniaUSA
| | - Teresa Druck
- Department of Molecular Virology, Immunology and Medical GeneticsColumbusOhioUSA
| | - Kay Huebner
- Department of Molecular Virology, Immunology and Medical GeneticsColumbusOhioUSA
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25
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FHIT loss-induced DNA damage creates optimal APOBEC substrates: Insights into APOBEC-mediated mutagenesis. Oncotarget 2016; 6:3409-19. [PMID: 25401976 PMCID: PMC4413662 DOI: 10.18632/oncotarget.2636] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2014] [Accepted: 10/23/2014] [Indexed: 12/20/2022] Open
Abstract
APOBEC cytidine deaminase activity is a major source of hypermutation in cancer. But previous studies have shown that the TC context signature of these enzymes is not observed in sizable fractions of cancers with overexpression of APOBEC, suggesting that cooperating factors that contribute to this mutagenesis should be identified. The fragile histidine triad protein (Fhit) is a tumor suppressor and DNA caretaker that is deleted or silenced in >50% of cancers. Loss of Fhit protein activity causes replication stress through reduced Thymidine Kinase 1 expression, increased DNA breaks, and global genome instability in normal and cancer cells. Using data from The Cancer Genome Atlas (TCGA), we show that FHIT-low/APOBEC3B-high expressing lung adenocarcinomas display significantly increased numbers of APOBEC signature mutations. Tumor samples in this cohort with normal FHIT expression do not exhibit APOBEC hypermutation, despite having high APOBEC3B expression. In vitro, silencing Fhit expression elevates APOBEC3B-directed C > T mutations in the TP53 gene. Furthermore, inhibition of Fhit loss-induced DNA damage via thymidine supplementation decreases the TP53 mutation burden in FHIT-low/APOBEC3B-high cells. We conclude that APOBEC3B overexpression and Fhit-loss induced DNA damage are independent events that, when occurring together, result in a significantly increased frequency of APOBEC-induced mutations that drive cancer progression.
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26
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Simple M, Suresh A, Das D, Kuriakose MA. Cancer stem cells and field cancerization of Oral squamous cell carcinoma. Oral Oncol 2015; 51:643-51. [DOI: 10.1016/j.oraloncology.2015.04.006] [Citation(s) in RCA: 75] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2015] [Revised: 04/02/2015] [Accepted: 04/04/2015] [Indexed: 12/20/2022]
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Abstract
WWOX, the WW domain-containing oxidoreductase gene at chromosome region 16q23.3-q24.1, spanning chromosomal fragile site FRA16D, encodes the 46 kDa Wwox protein, a tumor suppressor that is lost or reduced in expression in a wide variety of cancers, including breast, prostate, ovarian, and lung. The function of Wwox as a tumor suppressor implies that it serves a function in the prevention of carcinogenesis. Indeed, in vitro studies show that Wwox protein interacts with many binding partners to regulate cellular apoptosis, proliferation, and/or maturation. It has been reported that newborn Wwox knockout mice exhibit nascent osteosarcomas while Wwox(+/-) mice exhibit increased incidence of spontaneous and induced tumors. Furthermore, absence or reduction of Wwox expression in mouse xenograft models results in increased tumorigenesis, which can be rescued by Wwox re-expression, though there is not universal agreement among investigators regarding the role of Wwox loss in these experimental models. Despite this proposed tumor suppressor function, the overlap of the human WWOX locus with FRA16D sensitizes the gene to protein-inactivating deletions caused by replication stress. The high frequency of deletions within the WWOX locus in cancers of various types, without the hallmark protein inactivation-associated mutations of "classical" tumor suppressors, has led to the proposal that WWOX deletions in cancers are passenger events that occur in early cancer progenitor cells due to fragility of the genetic locus, rather than driver events which provide the cancer cell a selective advantage. Recently, a proposed epigenetic cause of chromosomal fragility has suggested a novel mechanism for early fragile site instability and has implications regarding the involvement of tumor suppressor genes at chromosomal fragile sites in cancer. In this review, we provide an overview of the evidence for WWOX as a tumor suppressor gene and put this into the context of fragility associated with the FRA16D locus.
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Affiliation(s)
- Morgan S Schrock
- Biomedical Sciences Graduate Program, Ohio State University Wexner Medical Center, Columbus, Ohio 43210, USA Department of Molecular Virology, Immunology and Medical Genetics, Comprehensive Cancer Center, Ohio State University Wexner Medical Center, Columbus, Ohio 43210, USA
| | - Kay Huebner
- Department of Molecular Virology, Immunology and Medical Genetics, Comprehensive Cancer Center, Ohio State University Wexner Medical Center, Columbus, Ohio 43210, USA
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28
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Waters CE, Saldivar JC, Hosseini SA, Huebner K. The FHIT gene product: tumor suppressor and genome "caretaker". Cell Mol Life Sci 2014; 71:4577-87. [PMID: 25283145 DOI: 10.1007/s00018-014-1722-0] [Citation(s) in RCA: 73] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2014] [Accepted: 08/28/2014] [Indexed: 01/13/2023]
Abstract
The FHIT gene at FRA3B is one of the earliest and most frequently altered genes in the majority of human cancers. It was recently discovered that the FHIT gene is not the most fragile locus in epithelial cells, the cell of origin for most Fhit-negative cancers, eroding support for past claims that deletions at this locus are simply passenger events that are carried along in expanding cancer clones, due to extreme vulnerability to DNA damage rather than to loss of FHIT function. Indeed, recent reports have reconfirmed FHIT as a tumor suppressor gene with roles in apoptosis and prevention of the epithelial-mesenchymal transition. Other recent works have identified a novel role for the FHIT gene product, Fhit, as a genome "caretaker." Loss of this caretaker function leads to nucleotide imbalance, spontaneous replication stress, and DNA breaks. Because Fhit loss-induced DNA damage is "checkpoint blind," cells accumulate further DNA damage during subsequent cell cycles, accruing global genome instability that could facilitate oncogenic mutation acquisition and expedite clonal expansion. Loss of Fhit activity therefore induces a mutator phenotype. Evidence for FHIT as a mutator gene is discussed in light of these recent investigations of Fhit loss and subsequent genome instability.
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Affiliation(s)
- Catherine E Waters
- Biomedical Sciences Graduate Program, Ohio State University Wexner Medical Center, Columbus, OH, USA
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29
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Replicative Stress and the FHIT Gene: Roles in Tumor Suppression, Genome Stability and Prevention of Carcinogenesis. Cancers (Basel) 2014; 6:1208-19. [PMID: 24901304 PMCID: PMC4074825 DOI: 10.3390/cancers6021208] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2014] [Revised: 05/21/2014] [Accepted: 05/26/2014] [Indexed: 12/25/2022] Open
Abstract
The fragile FHIT gene, encompassing the chromosomal fragile site FRA3B, is an early target of DNA damage in precancerous cells. While vulnerable to DNA damage itself, FHIT protein expression is essential to protect from DNA damage-induced cancer initiation and progression by modulating genome stability, oxidative stress and levels of accumulating DNA damage. Thus, FHIT, whose expression is lost or reduced in many human cancers, is a tumor suppressor and genome caretaker whose loss initiates genome instability in preneoplastic lesions. Ongoing studies are seeking more detailed understanding of the role of FHIT in the cellular response to oxidative damage. This review discusses the relationship between FHIT, reactive oxygen species production, and DNA damage in the context of cancer initiation and progression.
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30
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Hu B, Ying X, Wang J, Piriyapongsa J, Jordan IK, Sheng J, Yu F, Zhao P, Li Y, Wang H, Ng WL, Hu S, Wang X, Wang C, Zheng X, Li W, Curran WJ, Wang Y. Identification of a tumor-suppressive human-specific microRNA within the FHIT tumor-suppressor gene. Cancer Res 2014; 74:2283-94. [PMID: 24556720 DOI: 10.1158/0008-5472.can-13-3279] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Loss or attenuated expression of the tumor-suppressor gene FHIT is associated paradoxically with poor progression of human tumors. Fhit promotes apoptosis and regulates reactive oxygen species; however, the mechanism by which Fhit inhibits tumor growth in animals remains unclear. In this study, we used a multidisciplinary approach based on bioinformatics, small RNA library screening, human tissue analysis, and a xenograft mouse model to identify a novel member of the miR-548 family in the fourth intron of the human FHIT gene. Characterization of this human-specific microRNA illustrates the importance of this class of microRNAs in tumor suppression and may influence interpretation of Fhit action in human cancer.
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Affiliation(s)
- Baocheng Hu
- Authors' Affiliations: Department of Medical Molecular Biology, Beijing Institute of Biotechnology; Center of Computational Biology, Beijing Institute of Basic Medical Sciences; Department of Pathology, Chinese PLA General Hospital; Department of Biochemistry and Molecular Biology, Beijing Institute of Radiation Medicine, Beijing, China; Department of Radiation Oncology, Emory University School of Medicine, Winship Cancer Institute of Emory University; School of Biology, Georgia Institute of Technology, Atlanta, Georgia; Department of Cancer Biology, Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania; and Genome Institute, National Center for Genetic Engineering and Biotechnology, Pathumthani, Thailand
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31
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Miuma S, Saldivar JC, Karras JR, Waters CE, Paisie CA, Wang Y, Jin V, Sun J, Druck T, Zhang J, Huebner K. Fhit deficiency-induced global genome instability promotes mutation and clonal expansion. PLoS One 2013; 8:e80730. [PMID: 24244712 PMCID: PMC3828255 DOI: 10.1371/journal.pone.0080730] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2013] [Accepted: 10/07/2013] [Indexed: 01/25/2023] Open
Abstract
Loss of Fhit expression, encoded at chromosome fragile site FRA3B, leads to increased replication stress, genome instability and accumulation of genetic alterations. We have proposed that Fhit is a genome ‘caretaker’ whose loss initiates genome instability in preneoplastic lesions. We have characterized allele copy number alterations and expression changes observed in Fhit-deficient cells in conjunction with alterations in cellular proliferation and exome mutations, using cells from mouse embryo fibroblasts (MEFs), mouse kidney, early and late after establishment in culture, and in response to carcinogen treatment. Fhit-/- MEFs escape senescence to become immortal more rapidly than Fhit+/+ MEFs; -/- MEFs and kidney cultures show allele losses and gains, while +/+ derived cells show few genomic alterations. Striking alterations in expression of p53, p21, Mcl1 and active caspase 3 occurred in mouse kidney -/- cells during progressive tissue culture passage. To define genomic changes associated with preneoplastic changes in vivo, exome DNAs were sequenced for +/+ and -/- liver tissue after treatment of mice with the carcinogen, 7,12-dimethylbenz[a]anthracene, and for +/+ and -/- kidney cells treated in vitro with this carcinogen. The -/- exome DNAs, in comparison with +/+ DNA, showed small insertions, deletions and point mutations in more genes, some likely related to preneoplastic changes. Thus, Fhit loss provides a ‘mutator’ phenotype, a cellular environment in which mild genome instability permits clonal expansion, through proliferative advantage and escape from apoptosis, in response to pressures to survive.
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Affiliation(s)
- Satoshi Miuma
- Department of Molecular Virology, Immunology and Medical Genetics, Ohio State University Wexner Medical Center, Columbus, Ohio, United States of America
| | - Joshua C. Saldivar
- Department of Molecular Virology, Immunology and Medical Genetics, Ohio State University Wexner Medical Center, Columbus, Ohio, United States of America
| | - Jenna R. Karras
- Department of Molecular Virology, Immunology and Medical Genetics, Ohio State University Wexner Medical Center, Columbus, Ohio, United States of America
| | - Catherine E. Waters
- Department of Molecular Virology, Immunology and Medical Genetics, Ohio State University Wexner Medical Center, Columbus, Ohio, United States of America
| | - Carolyn A. Paisie
- Department of Molecular Virology, Immunology and Medical Genetics, Ohio State University Wexner Medical Center, Columbus, Ohio, United States of America
| | - Yao Wang
- Department of Biomedical Informatics, Ohio State University Wexner Medical Center, Columbus, Ohio, United States of America
| | - Victor Jin
- Department of Biomedical Informatics, Ohio State University Wexner Medical Center, Columbus, Ohio, United States of America
| | - Jin Sun
- Department of Molecular Virology, Immunology and Medical Genetics, Ohio State University Wexner Medical Center, Columbus, Ohio, United States of America
| | - Teresa Druck
- Department of Molecular Virology, Immunology and Medical Genetics, Ohio State University Wexner Medical Center, Columbus, Ohio, United States of America
| | - Jie Zhang
- Department of Biomedical Informatics, Ohio State University Wexner Medical Center, Columbus, Ohio, United States of America
| | - Kay Huebner
- Department of Molecular Virology, Immunology and Medical Genetics, Ohio State University Wexner Medical Center, Columbus, Ohio, United States of America
- * E-mail:
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32
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Fhit delocalizes annexin a4 from plasma membrane to cytosol and sensitizes lung cancer cells to paclitaxel. PLoS One 2013; 8:e78610. [PMID: 24223161 PMCID: PMC3819369 DOI: 10.1371/journal.pone.0078610] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2013] [Accepted: 09/14/2013] [Indexed: 11/29/2022] Open
Abstract
Fhit protein is lost or reduced in a large fraction of human tumors, and its restoration triggers apoptosis and suppresses tumor formation or progression in preclinical models. Here, we describe the identification of candidate Fhit-interacting proteins with cytosolic and plasma membrane localization. Among these, Annexin 4 (ANXA4) was validated by co-immunoprecipitation and confocal microscopy as a partner of this novel Fhit protein complex. Here we report that overexpression of Fhit prevents Annexin A4 translocation from cytosol to plasma membrane in A549 lung cancer cells treated with paclitaxel. Moreover, paclitaxel administration in combination with AdFHIT acts synergistically to increase the apoptotic rate of tumor cells both in vitro and in vivo experiments.
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33
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Wong CY, Tang RKT, Lam RF, Io IYF, Yuen CYF, Ho JWC, Tse RKK. Muir-Torre Syndrome in a Middle-Aged Chinese Patient with Sebaceous Carcinoma of the Eyelid. Semin Ophthalmol 2013; 30:420-2. [PMID: 24117411 DOI: 10.3109/08820538.2013.833267] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Muir-Torre syndrome is a rare, autosomal dominant condition characterized by the presence of a skin tumor of sebaceous differentiation and visceral malignancies. We reviewed the case of a 46-year-old Chinese man who had a bleeding mass over the right upper eyelid. He had a history of colon cancer and a family history satisfying the Amsterdam criteria for hereditary non-polyposis colorectal cancer syndrome with germline mutation in the MutS homolog-2 gene. The eyelid lesion was excised completely and submitted for histopathologic examination which showed sebaceous carcinoma. Frozen section and conjunctival map biopsy showed no residual malignancy or local metastasis. Post-operative positron-emission tomography with combined computed tomography did not reveal any residual or visceral malignancy. He had no recurrence in the 32-month follow-up period. We should consider Muir-Torre syndrome in patients with sebaceous carcinoma, especially in the presence of personal and/or family history of visceral malignancies.
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Affiliation(s)
- Ching-Yuen Wong
- a Department of Ophthalmology , Caritas Medical Centre , Hong Kong
| | | | - Robert Fung Lam
- a Department of Ophthalmology , Caritas Medical Centre , Hong Kong
| | - Ida Yu-Fong Io
- a Department of Ophthalmology , Caritas Medical Centre , Hong Kong
| | - Can Yin-Fun Yuen
- a Department of Ophthalmology , Caritas Medical Centre , Hong Kong
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Zuo H, Chan ASL, Ammer H, Wong YH. Activation of Gαq subunits up-regulates the expression of the tumor suppressor Fhit. Cell Signal 2013; 25:2440-52. [PMID: 23993961 DOI: 10.1016/j.cellsig.2013.08.019] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2013] [Accepted: 08/24/2013] [Indexed: 12/31/2022]
Abstract
The tumor suppressor Fhit protein is defective or absent in many tumor cells due to methylation, mutation or deletion of the FHIT gene. Despite numerous attempts to unravel the functions of Fhit, the mechanisms by which the function and expression of Fhit are regulated remain poorly understood. We have recently shown that activated Gαq subunits interact directly with Fhit and enhance its inhibitory effect on cell growth. Here we investigated the regulation of Fhit expression by Gq. Our results showed that Fhit was up-regulated specifically by activating Gα subunits of the Gq subfamily but not by those of the other G protein subfamilies. This up-regulation effect was mediated by a PKC/MEK pathway independent of Src-mediated Fhit Tyr(114) phosphorylation. We further demonstrated that elevated Fhit expression was due to the specific regulation of Fhit protein synthesis in the ribosome by activated Gαq, where the regulations of cap-dependent protein synthesis were apparently not required. Moreover, we showed that activated Gαq could increase cell-cell adhesion through Fhit. These findings provide a possible handle to modulate the level of the Fhit tumor suppressor by manipulating the activity of Gq-coupled receptors.
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Affiliation(s)
- Hao Zuo
- Division of Life Sciences, and the Biotechnology Research Institute, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.
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35
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Zuo H, Chan GPW, Zhu J, Yeung WWS, Chan ASL, Ammer H, Wong YH. Activation state-dependent interaction between Gαq subunits and the Fhit tumor suppressor. Cell Commun Signal 2013; 11:59. [PMID: 23947369 PMCID: PMC3751744 DOI: 10.1186/1478-811x-11-59] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2013] [Accepted: 08/12/2013] [Indexed: 12/30/2022] Open
Abstract
Background The FHIT tumor suppressor gene is arguably the most commonly altered gene in cancer since it is inactivated in about 60% of human tumors. The Fhit protein is a member of the ubiquitous histidine triad proteins which hydrolyze dinucleoside polyphosphates such as Ap3A. Despite the fact that Fhit functions as a tumor suppressor, the pathway through which Fhit inhibits growth of cancer cells remains largely unknown. Phosphorylation by Src tyrosine kinases provides a linkage between Fhit and growth factor signaling. Since many G proteins can regulate cell proliferation through multiple signaling components including Src, we explored the relationship between Gα subunits and Fhit. Results Several members of the Gαq subfamily (Gα16, Gα14, and Gαq) were found to co-immunoprecipitate with Fhit in their GTP-bound active state in HEK293 cells. The binding of activated Gαq members to Fhit appeared to be direct and was detectable in native DLD-1 colon carcinoma cells. The use of Gα16/z chimeras further enabled the mapping of the Fhit-interacting domain to the α2-β4 region of Gα16. However, Gαq/Fhit did not affect either Ap3A binding and hydrolysis by Fhit, or the ability of Gαq/16 to regulate downstream effectors including phospholipase Cβ, Ras, ERK, STAT3, and IKK. Functional mutants of Fhit including the H96D, Y114F, L25W and L25W/I10W showed comparable abilities to associate with Gαq. Despite the lack of functional regulation of Gq signaling by Fhit, stimulation of Gq-coupled receptors in HEK293 and H1299 cells stably overexpressing Fhit led to reduced cell proliferation, as opposed to an enhanced cell proliferation typically seen with parental cells. Conclusions Activated Gαq members interact with Fhit through their α2-β4 region which may result in enhancement of the growth inhibitory effect of Fhit, thus providing a possible avenue for G protein-coupled receptors to modulate tumor suppression.
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Affiliation(s)
- Hao Zuo
- Division of Life Sciences, Biotechnology Research Institute, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
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Abstract
The role of the promyelocytic leukemia (PML) protein has been widely tested in many different contexts, as attested by the hundreds of papers present in the literature. In most of these studies, PML is regarded as a tumor suppressor, a notion on the whole accepted by the scientific community. In this review, we examine how the concept of tumor-suppressor gene has evolved until now and then systematically assess whether this assumption for PML is supported by unambiguous experimental evidence.
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Affiliation(s)
- Massimiliano Mazza
- Department of Experimental Oncology, European Institute of Oncology , Milan , Italy
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Saldivar JC, Miuma S, Bene J, Hosseini SA, Shibata H, Sun J, Wheeler LJ, Mathews CK, Huebner K. Initiation of genome instability and preneoplastic processes through loss of Fhit expression. PLoS Genet 2012; 8:e1003077. [PMID: 23209436 PMCID: PMC3510054 DOI: 10.1371/journal.pgen.1003077] [Citation(s) in RCA: 77] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2012] [Accepted: 09/25/2012] [Indexed: 12/27/2022] Open
Abstract
Genomic instability drives tumorigenesis, but how it is initiated in sporadic neoplasias is unknown. In early preneoplasias, alterations at chromosome fragile sites arise due to DNA replication stress. A frequent, perhaps earliest, genetic alteration in preneoplasias is deletion within the fragile FRA3B/FHIT locus, leading to loss of Fhit protein expression. Because common chromosome fragile sites are exquisitely sensitive to replication stress, it has been proposed that their clonal alterations in cancer cells are due to stress sensitivity rather than to a selective advantage imparted by loss of expression of fragile gene products. Here, we show in normal, transformed, and cancer-derived cell lines that Fhit-depletion causes replication stress-induced DNA double-strand breaks. Using DNA combing, we observed a defect in replication fork progression in Fhit-deficient cells that stemmed primarily from fork stalling and collapse. The likely mechanism for the role of Fhit in replication fork progression is through regulation of Thymidine kinase 1 expression and thymidine triphosphate pool levels; notably, restoration of nucleotide balance rescued DNA replication defects and suppressed DNA breakage in Fhit-deficient cells. Depletion of Fhit did not activate the DNA damage response nor cause cell cycle arrest, allowing continued cell proliferation and ongoing chromosomal instability. This finding was in accord with in vivo studies, as Fhit knockout mouse tissue showed no evidence of cell cycle arrest or senescence yet exhibited numerous somatic DNA copy number aberrations at replication stress-sensitive loci. Furthermore, cells established from Fhit knockout tissue showed rapid immortalization and selection of DNA deletions and amplifications, including amplification of the Mdm2 gene, suggesting that Fhit loss-induced genome instability facilitates transformation. We propose that loss of Fhit expression in precancerous lesions is the first step in the initiation of genomic instability, linking alterations at common fragile sites to the origin of genome instability. Normal cells have robust mechanisms to maintain the proper sequence of their DNA; in cancer cells these mechanisms are compromised, resulting in complex changes in the DNA of tumors. How this genome instability begins has not been defined, except in cases of familial cancers, which often have mutations in genes called “caretaker” genes, necessary to preserve DNA stability. We have defined a mechanism for genome instability in non-familial tumors that occur sporadically in the population. Certain fragile regions of our DNA are more difficult to duplicate during cell division and are prone to breakage. A fragile region, FRA3B, lies within the FHIT gene, and deletions within FRA3B are common in precancer cells, causing loss of Fhit protein expression. We find that loss of Fhit protein causes defective DNA replication, leading to further DNA breaks. Cells that continue DNA replication in the absence of Fhit develop numerous chromosomal aberrations. Importantly, cells established from tissues of mice that are missing Fhit undergo selection for increasing DNA alterations that can promote immortality, a cancer cell hallmark. Thus, loss of Fhit expression in precancer cells is the first step in the initiation of genomic instability and facilitates cancer development.
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Affiliation(s)
- Joshua C Saldivar
- Biomedical Sciences Graduate Program, Ohio State University, Columbus, Ohio, United States of America
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Martin J, St-Pierre MV, Dufour JF. Hit proteins, mitochondria and cancer. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2011; 1807:626-32. [PMID: 21316334 DOI: 10.1016/j.bbabio.2011.02.001] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2010] [Revised: 02/02/2011] [Accepted: 02/02/2011] [Indexed: 11/30/2022]
Abstract
The histidine triad (HIT) superfamily comprises proteins that share the histidine triad motif, His-ϕ-His-ϕ-His-ϕ-ϕ, where ϕ is a hydrophobic amino acid. HIT proteins are ubiquitous in prokaryotes and eukaryotes. HIT proteins bind nucleotides and exert dinucleotidyl hydrolase, nucleotidylyl transferase or phosphoramidate hydrolase enzymatic activity. In humans, 5 families of HIT proteins are recognized. The accumulated epidemiological and experimental evidence indicates that two branches of the superfamily, the HINT (Histidine Triad Nucleotide Binding) members and FHIT (Fragile Histidine Triad), have tumor suppressor properties but a conclusive physiological role can still not be assigned to these proteins. Aprataxin forms another discrete branch of the HIT superfamily, is implicated in DNA repair mechanisms and unlike the HINT and FHIT members, a defective protein can be conclusively linked to a disease, ataxia with oculomotor apraxia type 1. The scavenger mRNA decapping enzyme, DcpS, forms a fourth branch of the HIT superfamily. Finally, the GalT enzymes, which exert specific nucleoside monophosphate transferase activity, form a fifth branch that is not implicated in tumorigenesis. The molecular mechanisms by which the HINT and FHIT proteins participate in bioenergetics of cancer are just beginning to be unraveled. Their purported actions as tumor suppressors are highlighted in this review.
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Affiliation(s)
- Juliette Martin
- Institute of Clinical Pharmacology and Visceral Research, University of Bern, Switzerland
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Sun J, Liu J, Pan X, Quimby D, Zanesi N, Druck T, Pfeifer GP, Croce CM, Fong LY, Huebner K. Effect of zinc supplementation on N-nitrosomethylbenzylamine-induced forestomach tumor development and progression in tumor suppressor-deficient mouse strains. Carcinogenesis 2010; 32:351-8. [PMID: 21097531 DOI: 10.1093/carcin/bgq251] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
Zinc deficiency is associated with high incidences of esophageal and other cancers in humans and leads to a highly proliferative hyperplastic condition in the upper gastrointestinal tract in laboratory rodents. Zn replenishment reduces the incidence of lingual, esophageal and forestomach tumors in Zn-deficient rats and mice. While previous animal studies focused on Zn deficiency, we have investigated the effect of Zn supplementation on carcinogenesis in Zn-sufficient mice of wild-type and tumor suppressor-deficient mouse strains. All mice received N-nitrosomethylbenzylamine and half the mice of each strain then received Zn supplementation. At killing, mice without Zn supplementation had developed more tumors than Zn-supplemented mice: wild-type C57BL/6 mice developed an average of 7.0 versus 5.0 tumors for Zn supplemented (P < 0.05); Zn-supplemented Fhit-/- mice averaged 5.7 versus 8.0 for control mice (P < 0.01); Zn-supplemented Fhit-/-Nit1-/- mice averaged 5.4 versus 9.2 for control mice (P < 0.01) and Zn-supplemented Fhit-/-Rassf1a-/- (the murine gene) mice averaged 5.9 versus 9.1 for control mice (P < 0.01). Zn supplementation reduced tumor burdens by 28% (wild-type) to 42% (Fhit-/-Nit1-/-). Histological analysis of forestomach tissues also showed significant decreases in severity of preneoplastic and neoplastic lesions in Zn-supplemented cohorts of each mouse strain. Thus, Zn supplementation significantly reduced tumor burdens in mice with multiple tumor suppressor deficiencies. When Zn supplementation was begun at 7 weeks after the final carcinogen dose, the reduction in tumor burden was the same as observed when supplementation began immediately after carcinogen dosing, suggesting that Zn supplementation may affect tumor progression rather than tumor initiation.
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Affiliation(s)
- Jin Sun
- Department of Molecular Virology, Immunology and Medical Genetics, The Ohio State University Comprehensive Cancer Center, Columbus, OH 43210, USA
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Huebner K, Saldivar JC, Sun J, Shibata H, Druck T. Hits, Fhits and Nits: beyond enzymatic function. ACTA ACUST UNITED AC 2010; 51:208-17. [PMID: 21035495 DOI: 10.1016/j.advenzreg.2010.09.003] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2010] [Accepted: 09/02/2010] [Indexed: 11/29/2022]
Abstract
We have briefly summarized what is known about these proteins, but in closing wish to feature the outstanding questions. Hint1 was discovered mistakenly as an inhibitor of Protein Kinase C and designated Pkci, a designation that still confuses the literature. The other Hint family members were discovered by homology to Hint1. Aprataxin was discovered as a result of the hunt for a gene responsible for AOA1. Fhit was discovered through cloning of a familial chromosome translocation breakpoint on chromosome 3 that interrupts the large FHIT gene within an intron, in the FRA3B chromosome region (Ohta et al., 1996), now known to be the region of the human genome most susceptible to DNA damage due to replication stress (Durkin et al., 2008). The NitFhit fusion genewas discovered during searches for Fhit homologs in flies and worms because the fly/worm Nit polypeptide is fused to the 5'-end of the Fhit gene; the mammalian Nit gene family was discovered because of the NitFhit fusion gene, in searches for homologs to the Nit polypeptide of the NitFhit gene. Each of the Hit family member proteins is reported to have enzymatic activities toward putative substrates involving nucleosides or dinucleosides. Most surprisingly, each of the Hit family proteins discussed has been implicated in important DNA damage response pathways and/or tumor suppression pathways. And for each of them it has been difficult to assign definite substrates, to know if the substrates and catalytic products have biological functions, to know if that function is related to the DNA damage response and suppressor functions, and to precisely define the pathways through which tumor suppression occurs. When the fly Nit sequence was found at the 5'-end of the fly Fhit gene, this gene was hailed as a Rosetta stone gene/protein that would help in discovery of the function of Fhit, because the Nit protein should be in the same signal pathway (Pace et al., 2000). However, the mammalian Nit family proteins have turned out to be at least as mysterious as the Fhit proteins, with the Nit1 substrate still unknown and the surprising finding that Nit proteins also appear to behave as tumor suppressor proteins. Whether the predicted enzymatic functions of these proteins are relevant to the observed biological functions, remain among the outstanding unanswered puzzles and raise the question: have these mammalian proteins evolved beyond the putative original enzymatic purpose, such that the catalytic function is now vestigial and subservient to signal pathways that use the protein-substrate complexes in pathways that signal apoptosis or DNA damage response? Or can these proteins be fulfilling catalytic functions independently but in parallel with signal pathway functions, as perhaps observed for Aprataxin? Or is the catalytic function indeed part of the observed biological functions, such as apoptosis and tumor suppression? Perhaps the recent, post-genomic focus on metabolomics and genome-wide investigations of signal pathway networks will lead to answers to some of these outstanding questions.
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Affiliation(s)
- Kay Huebner
- Department of Molecular Virology, Immunology, and Medical Genetics, The Ohio State University Medical Center, Columbus, OH 43210, United States.
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Uchida M, Tsukamoto Y, Uchida T, Ishikawa Y, Nagai T, Hijiya N, Nguyen LT, Nakada C, Kuroda A, Okimoto T, Kodama M, Murakami K, Noguchi T, Matsuura K, Tanigawa M, Seto M, Ito H, Fujioka T, Takeuchi I, Moriyama M. Genomic profiling of gastric carcinoma in situ and adenomas by array-based comparative genomic hybridization. J Pathol 2010; 221:96-105. [PMID: 20217874 DOI: 10.1002/path.2686] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Although genomic copy number aberrations (CNAs) of gastric carcinoma at the advanced stage have already been extensively characterized by array comparative genomic hybridization (array CGH) analysis, those of gastric carcinoma in situ (CIS) are still poorly understood. Furthermore, no reports have demonstrated correlations between CNAs and histopathological features of gastric adenoma. In this study, we investigated CNAs of 20 gastric CISs (Vienna category 4.2) and 20 adenomas including seven low-grade adenomas (LGA; Vienna category 3) and 13 high-grade adenomas (HGA; Vienna category 4.1), using oligonucleotide-based array CGH. The most frequent aberrations in CIS were gains at 8q (85%) and 20q (50%), and losses at 5q (50%) and 17p (50%), suggesting that these CNAs are involved in the development of CIS. We found that the pattern of CNAs in HGA was quite different from that in LGA. The most frequent CNAs in HGA were gains at 8q (62%) and 7pq (54%), whereas those in LGA were gain at 7q21.3-q22.1 (57%) and loss at 5q (43%). Interestingly, gains at 8q and 7pq, both of which occurred most frequently in HGA, were not detected in any cases of LGA. Of note, 8q gain was detected most frequently in both HGA and CIS but was undetected in LGA. Since HGA is believed to have a higher risk of progression to invasive carcinoma than LGA, these data suggest that 8q gain is important for the malignant transformation of gastric adenoma.
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Affiliation(s)
- Masahiro Uchida
- Department of Molecular Pathology, Oita University, Oita, Japan
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Shalin SC, Lyle S, Calonje E, Lazar AJF. Sebaceous neoplasia and the Muir-Torre syndrome: important connections with clinical implications. Histopathology 2010; 56:133-47. [PMID: 20055911 DOI: 10.1111/j.1365-2559.2009.03454.x] [Citation(s) in RCA: 78] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Sebaceous neoplasia comprises a spectrum ranging from benign to malignant. Proper histological identification is important for treatment, prognosis and potential association with the Muir-Torre syndrome (MTS). Our increased understanding of the significance and pathogenesis of these tumours has led to improved risk stratification, screening recommendations, and treatment of patients with an initial presentation of a sebaceous tumour. This review focuses on the diagnostic and histological features of sebaceous lesions, the MTS, and recent insights into the molecular pathogenesis of sebaceous tumours.
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Affiliation(s)
- Sara C Shalin
- Department of Pathology, Baylor College of Medicine, Houston, TX, USA
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43
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D'Arca D, LeNoir J, Wildemore B, Gottardo F, Bragantini E, Shupp-Byrne D, Zanesi N, Fassan M, Croce CM, Gomella LG, Baffa R. Prevention of urinary bladder cancer in the FHIT knock-out mouse with Rofecoxib, a Cox-2 inhibitor. Urol Oncol 2010; 28:189-94. [DOI: 10.1016/j.urolonc.2009.01.016] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2008] [Revised: 01/14/2009] [Accepted: 01/15/2009] [Indexed: 11/25/2022]
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Hassan MI, Naiyer A, Ahmad F. Fragile histidine triad protein: structure, function, and its association with tumorogenesis. J Cancer Res Clin Oncol 2009; 136:333-50. [PMID: 20033706 DOI: 10.1007/s00432-009-0751-9] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2009] [Accepted: 12/09/2009] [Indexed: 01/31/2023]
Abstract
BACKGROUND The human fragile histidine triad (FHIT) gene is a putative tumor suppressor gene, which is located at chromosome region 3p14.2. It was suggested that the loss of heterozygosity (LOH), homozygous deletions, and abnormal expression of the FHIT gene were involved in several types of human malignancies. MATERIALS AND METHODS To determine the role of FHIT in various cancers, we have performed structural and functional analysis of FHIT in detail. RESULTS AND DISCUSSION The protein FHIT catalyzes the Mg(2+) dependent hydrolysis of P1-5 cent-O-adenosine-P3-5 cent-O-adenosine triphosphate, Ap3A, to AMP, and ADP. The reaction is thought to follow a two-step mechanism. Histidine triad proteins, named for a motif related to the sequence H-cent-H-cent-H-cent-cent- (cent, a hydrophobic amino acid), belong to superfamily of nucleotide hydrolases and transferases. This enzyme acts on the R-phosphate of ribonucleotides, and contain a approximately 30-kDa domain that is typically a homodimer of approximately 15 kDa polypeptides with catalytic site. CONCLUSION Here we have gathered information is known about biological activities of FHIT, the structural and biochemical bases for their functions. Our approach may provide a comparative framework for further investigation of FHIT.
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Affiliation(s)
- Md Imtaiyaz Hassan
- Centre for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia, Jamia Nagar, New Delhi, 110025, India
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Sun J, Okumura H, Yearsley M, Frankel W, Fong LY, Druck T, Huebner K. Nit1 and Fhit tumor suppressor activities are additive. J Cell Biochem 2009; 107:1097-106. [PMID: 19479888 DOI: 10.1002/jcb.22207] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The fragile histidine triad gene (human FHIT, mouse Fhit) has been shown to act as a tumor suppressor gene. Nit1 and Fhit form a fusion protein, encoded by the NitFhit gene in flies and worms, suggesting that mammalian Nit1 and Fhit proteins, which are encoded by genes on different chromosomes in mammals, may function in the same signal pathway(s). A previous study showed that Nit1 deficiency in knockout mice confers a cancer prone phenotype, as does Fhit deficiency. We have now assessed the tumor susceptibility of Fhit(-/-)Nit1(-/-) mice and observed that double knockout mice develop more spontaneous and carcinogen-induced tumors than Fhit(-/-) mice, suggesting that the extent of tumor susceptibility due to Nit1 and Fhit deficiency is additive, and that Nit1 and Fhit affect distinct signal pathways in mammals. Nit1, like Fhit, is present in cytoplasm and mitochondria but not nuclei. Because Fhit deficiency affects responses to replicative and oxidative stress, we sought evidence for Nit1 function in response to such stresses in tissues and cultured cells: when treated with hydroxyurea, the normal kidney-derived double-deficient cells appear not to activate the pChk2 pathway and when treated with H(2)O(2), show little evidence of DNA damage, compared with wild type and Fhit(-/-) cells. The relevance of Nit1 deficiency to human cancers was examined in human esophageal cancer tissues, and loss of Nit1 expression was observed in 48% of esophageal adenocarcinomas.
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Affiliation(s)
- Jin Sun
- Department of Molecular Virology, Immunology, and Medical Genetics, Ohio State University Comprehensive Cancer Center, Columbus, Ohio 43210, USA
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46
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Yu X, Lu L, Wen S, Wang Y. The effects of Fhit on tumorigenesis after multi-exposure to low-dose radiation. Int J Clin Exp Med 2009; 2:348-53. [PMID: 20057978 PMCID: PMC2802049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2009] [Accepted: 11/18/2009] [Indexed: 05/28/2023]
Abstract
Low-dose (= 0.1 Gy) radiation could reduce high-dose induced damage including tumorigenesis. However, it remains unclear whether multi-exposure to low-dose radiation at a high dose rate has any risk for increasing tumorigenesis, and whether Fhit plays any role in the process. The purpose of this study is to investigate the effects of multi-exposure to low-dose radiation at a high dose rate on tumorigenesis, and the role of Fhit in it. We irradiated Fhit(+/+) and Fhit(-/-) mice with 1 Gy/1 or 0.1 Gy x 10 exposures at a dose rate of 1 Gy/min, sacrificed the mice at 1.5 years after radiation and observed multi-organ tumorigenesis. The results showed that although the spontaneous tumorigenesis in these mice was relatively high, 1 Gy/1-exposure dramatically increased the tumorigenesis including lung and liver tumor. Fhit(-/-) mice showed more tumorigenesis than Fhit(+/+) mice after 1 Gy/1-exposure. However, 0.1 Gy x 10 exposures did not increase tumorigenesis, and there was no statistical difference in tumorigenesis between Fhit(+/+) mice and Fhit(-/-) mice following 0.1 Gy x 10 exposures. Our results suggest that 0.1 Gy, even after multiple exposures, does not increase tumorigenesis, and Fhit could prevent high-dose radiation-induced tumors but has no effect in a low-dose environment.
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Affiliation(s)
- Xiaoyan Yu
- Department of Radiation Oncology, Winship Cancer Institute, Emory UniversityAtlanta, GA 30322, USA
- Department of Experimental Phamacology and Toxicology, School of Pharmacy, Jilin UniversityChangchun, 130021, China
| | - Lin Lu
- Department of Radiation Oncology, Thomas Jefferson UniversityPhiladelphia, PA 19107, USA
| | - Siyuan Wen
- Department of Radiation Oncology, Winship Cancer Institute, Emory UniversityAtlanta, GA 30322, USA
- Current address: Beijing Institute of Radiation MedicineBeijing 100850, China
| | - Ya Wang
- Department of Radiation Oncology, Winship Cancer Institute, Emory UniversityAtlanta, GA 30322, USA
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Hiraoka H, Minami K, Kaneko N, Shimokawa Miyama T, Mizuno T, Okuda M. Molecular cloning of the canine fragile histidine triad (FHIT) gene and Fhit protein expression in canine peripheral blood mononuclear cells. J Vet Med Sci 2009; 71:645-9. [PMID: 19498293 DOI: 10.1292/jvms.71.645] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
A fragile histidine triad (FHIT) gene has been studied as a tumor-associated gene in humans. The aberrant FHIT gene and its protein expression have been reported in many types of human cancers. The present study explored the canine FHIT gene structure and its protein expression in the peripheral blood mononuclear cells of healthy dogs by RT-PCR, RACE and immunoblot analysis. The obtained canine FHIT gene contained nine small exons and was located on canine chromosome 20. Furthermore, we identified an alternative splicing form of the FHIT transcript. The deduced amino acid sequence was well conserved between species, and anti-human Fhit antibody could be used to detect the canine Fhit protein. These findings will be useful for future research.
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Affiliation(s)
- Hiroko Hiraoka
- Faculty of Agriculture, Yamaguchi University, Yamaguchi, Japan
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Krasnikov BF, Chien CH, Nostramo R, Pinto JT, Nieves E, Callaway M, Sun J, Huebner K, Cooper AJL. Identification of the putative tumor suppressor Nit2 as omega-amidase, an enzyme metabolically linked to glutamine and asparagine transamination. Biochimie 2009; 91:1072-80. [PMID: 19595734 DOI: 10.1016/j.biochi.2009.07.003] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2009] [Accepted: 07/03/2009] [Indexed: 11/25/2022]
Abstract
The present report identifies the enzymatic substrates of a member of the mammalian nitrilase-like (Nit) family. Nit2, which is widely distributed in nature, has been suggested to be a tumor suppressor protein. The protein was assumed to be an amidase based on sequence homology to other amidases and on the presence of a putative amidase-like active site. This assumption was recently confirmed by the publication of the crystal structure of mouse Nit2. However, the in vivo substrates were not previously identified. Here we report that rat liver Nit2 is omega-amidodicarboxylate amidohydrolase (E.C. 3.5.1.3; abbreviated omega-amidase), a ubiquitously expressed enzyme that catalyzes a variety of amidase, transamidase, esterase and transesterification reactions. The in vivo amidase substrates are alpha-ketoglutaramate and alpha-ketosuccinamate, generated by transamination of glutamine and asparagine, respectively. Glutamine transaminases serve to salvage a number of alpha-keto acids generated through non-specific transamination reactions (particularly those of the essential amino acids). Asparagine transamination appears to be useful in mitochondrial metabolism and in photorespiration. Glutamine transaminases play a particularly important role in transaminating alpha-keto-gamma-methiolbutyrate, a key component of the methionine salvage pathway. Some evidence suggests that excess alpha-ketoglutaramate may be neurotoxic. Moreover, alpha-ketosuccinamate is unstable and is readily converted to a number of hetero-aromatic compounds that may be toxic. Thus, an important role of omega-amidase is to remove potentially toxic intermediates by converting alpha-ketoglutaramate and alpha-ketosuccinamate to biologically useful alpha-ketoglutarate and oxaloacetate, respectively. Despite its importance in nitrogen and sulfur metabolism, the biochemical significance of omega-amidase has been largely overlooked. Our report may provide clues regarding the nature of the biological amidase substrate(s) of Nit1 (another member of the Nit family), which is a well-established tumor suppressor protein), and emphasizes a) the crucial role of Nit2 in nitrogen and sulfur metabolism, and b) the possible link of Nit2 to cancer biology.
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Affiliation(s)
- Boris F Krasnikov
- Department of Biochemistry and Molecular Biology, New York Medical College, Valhalla, NY 10595, USA.
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Ferens B, Kawiak A, Banecki B, Bielawski KP, Zawacka-Pankau J. Aberration of the enzymatic activity of Fhit tumor suppressor protein enhances cancer cell death upon photodynamic therapy similarly to that driven by wild-type Fhit. Cancer Lett 2009; 280:101-9. [DOI: 10.1016/j.canlet.2009.02.014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2008] [Revised: 02/05/2009] [Accepted: 02/09/2009] [Indexed: 11/29/2022]
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50
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Zhang H, Hou YJ, Han SY, Zhang EC, Huebner K, Zhang J. Mammalian nitrilase 1 homologue Nit1 is a negative regulator in T cells. Int Immunol 2009; 21:691-703. [PMID: 19395373 DOI: 10.1093/intimm/dxp038] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
The mammalian Nit1 protein is homologous to plant and bacterial nitrilases. In flies and worms, Nit1 is fused to the 5' end of Fhit, suggesting that Nit1 may functionally interact with the Fhit pathway. Fhit has been shown to play a role of a tumor suppressor. Somatic loss of Fhit in human tissues is associated with a wide variety of cancers. Deletion of Fhit results in a predisposition to induced and spontaneous tumors in mice. It has been suggested that Nit1 collaborates with Fhit in tumor suppression. Similar to mice lacking Fhit, Nit1-deficient mice are more sensitive to carcinogen-induced tumors. It was previously shown that ectopic expression of Nit1 or Fhit led to caspase activation and apoptosis, and that both proteins may play a role in DNA damage-induced apoptosis. In this study, we analyzed the physiological function of Nit1 in T cells using Nit1-knockout mice. Nit1-deficient T cells can undergo apoptosis induced by DNA damage due to irradiation and chemical treatment. However, apoptosis induced by Fas or Ca(++) signals appeared to be compromised. Additionally, Nit1 deficiency resulted in T cell hyperproliferative responses induced by TCR stimulation. The expressions of T cell activation markers were elevated in Nit1(-/-) T cells. There was a spontaneous cell cycle entry and enhanced cell cycle progression in Nit1(-/-) T cells. These data indicate that Nit1 is a novel negative regulator in primary T cells.
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Affiliation(s)
- Haibing Zhang
- Department of Microbiology and Immunology, Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, PA 19107, USA
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