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Schrank TP, Lenze N, Landess LP, Hoyle A, Parker J, Lal A, Sheth S, Chera BS, Patel SN, Hackman TG, Major MB, Issaeva N, Yarbrough WG. Genomic heterogeneity and copy number variant burden are associated with poor recurrence-free survival and 11q loss in human papillomavirus-positive squamous cell carcinoma of the oropharynx. Cancer 2021; 127:2788-2800. [PMID: 33819343 DOI: 10.1002/cncr.33504] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Revised: 01/15/2021] [Accepted: 01/23/2021] [Indexed: 11/09/2022]
Abstract
BACKGROUND Human papillomavirus-positive (HPV+) squamous cell carcinoma of the oropharynx (OPSCC) is the most prevalent HPV-associated malignancy in the United States. Favorable treatment outcomes have led to increased interest in treatment de-escalation to reduce treatment morbidity as well as the development of prognostic markers to identify appropriately low-risk patients. Intratumoral genomic heterogeneity and copy number alteration burden have been demonstrated to be predictive of poor outcomes in many other cancers; therefore, we sought to determine whether intratumor heterogeneity and genomic instability are associated with poor outcomes in HPV+ OPSCC. METHODS Tumor heterogeneity estimates were made based on targeted exome sequencing of 45 patients with HPV+ OPSCC tumors. Analysis of an additional cohort of HPV+ OPSCC tumors lacking matched normal sequencing allowed copy number analysis of 99 patient tumors. RESULTS High intratumorally genomic heterogeneity and high numbers of copy number alterations were strongly associated with worse recurrence-free survival. Tumors with higher heterogeneity and frequent copy number alterations were associated with loss of distal 11q, which encodes key genes related to double-strand break repair, including ATM and MRE11A. CONCLUSIONS Both intratumor genomic heterogeneity and high-burden copy number alterations are strongly associated with poor recurrence-free survival in patients with HPV+ OPSCC. The drivers of genomic instability and heterogeneity in these tumors remains to be elucidated. However, 11q loss and defective DNA double-strand break repair have been associated with genomic instability in other solid tumors. Copy number alteration burden and intratumoral heterogeneity represent promising avenues for risk stratification of patients with HPV+OPSCC.
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Affiliation(s)
- Travis P Schrank
- Department of Otolaryngology-Head and Neck Surgery, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina.,Linberger Comprehensive Cancer Center, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Nicholas Lenze
- Department of Otolaryngology-Head and Neck Surgery, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Lee P Landess
- Department of Otolaryngology-Head and Neck Surgery, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Alan Hoyle
- Linberger Comprehensive Cancer Center, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Joel Parker
- Linberger Comprehensive Cancer Center, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Asim Lal
- Department of Otolaryngology-Head and Neck Surgery, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Siddharth Sheth
- Division of Hematology and Oncology, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Bhishamjit S Chera
- Department of Radiation Oncology, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Samip N Patel
- Department of Otolaryngology-Head and Neck Surgery, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Trevor G Hackman
- Department of Otolaryngology-Head and Neck Surgery, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - M Ben Major
- Linberger Comprehensive Cancer Center, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina.,Department of Cell Biology and Physiology, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina.,Department of Cell Biology and Physiology, Washington University in St. Louis, St. Louis, Missouri.,Institute for Informatics, School of Medicine, Washington University in St. Louis, St. Louis, Missouri.,Department of Otolaryngology, School of Medicine, Washington University in St. Louis, St. Louis, Missouri
| | - Natalia Issaeva
- Department of Otolaryngology-Head and Neck Surgery, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina.,Linberger Comprehensive Cancer Center, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina.,Department of Pathology and Lab Medicine, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Wendell G Yarbrough
- Department of Otolaryngology-Head and Neck Surgery, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina.,Linberger Comprehensive Cancer Center, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina.,Department of Pathology and Lab Medicine, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
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Razumova Z, Govorov I, Östensson E, Mints M. Cadmium Intake as a Prognostic Factor in Endometrial Cancer: A Swedish Cohort-Based Study. Nutr Cancer 2021; 74:175-184. [PMID: 33593165 DOI: 10.1080/01635581.2021.1883681] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Metalloendocrinology is a new interdisciplinary field, which was established due to the importance of connections between inorganic chemicals and hormonal mechanisms. The role of cadmium in hormone-related tumors is an excellent example of this connection, as cadmium mimics estrogen in the human body. Since endometrial cancer (EC) is hormone-related, it is well-suited for assessing the estrogenic effects of cadmium. Therefore, the present study aims to explore the role of dietary cadmium intake in the progression-free survival (PFS) and overall survival (OS) in women with EC. Dietary cadmium intake was estimated based on a large cohort of Swedish women (n = 416) with EC. Median dietary cadmium intake was then analyzed in relation to different tumor characteristics and clinical outcomes. Cox proportional hazard models were used to estimate hazard ratios (HRs) and 95% confidence intervals (CIs). Median daily dietary cadmium intake in the cohort was 13.1 μg (interquartile range 25%-75%=6.4). High dietary cadmium intake (μg/day) was associated with significantly decreased OS in the study cohort (HR = 0.956, 95% CI = 0.914-1.001, p = 0.05). Dietary cadmium intake was not associated with PFS (HR = 0.975, 95% CI = 0.924-1.028, p = 0.348). Therefore, our results indicate that high dietary cadmium intake could be associated with poor outcome in women with EC.
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Affiliation(s)
- Zoia Razumova
- Division of Neonatology, Obstetrics and Gynaecology, Department of Women's and Children's Health, Karolinska Institutet, Stockholm, Sweden
| | - Igor Govorov
- Division of Neonatology, Obstetrics and Gynaecology, Department of Women's and Children's Health, Karolinska Institutet, Stockholm, Sweden.,Institute of Perinatology and Paediatrics, Almazov National Medical Research Centre, St. Petersburg, Russia
| | - Ellinor Östensson
- Division of Neonatology, Obstetrics and Gynaecology, Department of Women's and Children's Health, Karolinska Institutet, Stockholm, Sweden
| | - Miriam Mints
- Division of Neonatology, Obstetrics and Gynaecology, Department of Women's and Children's Health, Karolinska Institutet, Stockholm, Sweden.,School of Medical Sciences, Faculty of Medicine and Health, Örebro University, Örebro, Sweden
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3
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Wu CL, Huang LY, Chang CL. Linking arsenite- and cadmium-generated oxidative stress to microsatellite instability in vitro and in vivo. Free Radic Biol Med 2017; 112:12-23. [PMID: 28690196 DOI: 10.1016/j.freeradbiomed.2017.07.006] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/09/2017] [Revised: 07/03/2017] [Accepted: 07/05/2017] [Indexed: 11/27/2022]
Abstract
Mismatch repair (MMR) corrects replicative errors and minimizes DNA damage that occurs frequently in microsatellites. MMR deficiency is manifested as microsatellite instability (MSI), which contributes to hypermutability and cancer pathogenesis. Genomic instability, including MSI and chromosomal instability, appears to be responsible for the carcinogenesis of arsenic and cadmium, common contaminants in our environment. However, few studies have addressed arsenic- or cadmium-induced MSI, especially its potential link with arsenic- or cadmium-generated oxidative stress, due to the lack of quantifiable MSI assays and cost-effective animal models. Here, using a dual-fluorescent reporter, we demonstrate that sub-lethal doses of cadmium or arsenite, but not arsenate, increased the MSI frequency in human colorectal cancer cells. Arsenite- and cadmium-induced MSI occurred concomitantly with increased levels of reactive species and oxidative DNA damage, and with decreased levels of MMR proteins. However, N-acetyl-l-cysteine (NAC) suppressed arsenite- and cadmium-induced MSI and oxidative stress while restoring the levels of MMR proteins in the cells. Similarly, MSI was induced separately by arsenite and cadmium, and suppressed by NAC, in zebrafish in a fluorescinated PCR-based assay with newly-developed microsatellite markers and inter-segmental comparisons. Of five selected antioxidants examined, differential effects were exerted on the MSI induction and cytotoxicity of both arsenite and cadmium. Compared to MMR-proficient cells, MMR-deficient cells were more resistant to arsenic-mediated and cadmium-mediated cytotoxicity. Our findings demonstrate a novel linkage between arsenite-generated and cadmium-generated oxidative stress and MSI induction. Our findings also caution that antioxidants must be individually validated before being used for preventing arsenite- and cadmium-induced MSI that is associated with cancer development.
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Affiliation(s)
- Chang-Lin Wu
- Institute of Basic Medical Sciences, College of Medicine, National Cheng Kung University, Tainan 70101, Taiwan, ROC
| | - Li-Yan Huang
- Institute of Molecular Medicine, College of Medicine, National Cheng Kung University, Tainan 70101, Taiwan, ROC
| | - Christina L Chang
- Institute of Basic Medical Sciences, College of Medicine, National Cheng Kung University, Tainan 70101, Taiwan, ROC; Institute of Molecular Medicine, College of Medicine, National Cheng Kung University, Tainan 70101, Taiwan, ROC.
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Du X, Lan T, Yuan B, Chen J, Hu J, Ren W, Chen Z. Cadmium-induced microsatellite instability in the kidneys and leukocytes of C57BL/6J mice. ENVIRONMENTAL TOXICOLOGY 2015; 30:683-692. [PMID: 24391048 DOI: 10.1002/tox.21946] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2013] [Revised: 12/15/2013] [Accepted: 12/21/2013] [Indexed: 06/03/2023]
Abstract
Cadmium is a cytotoxic, carcinogenic, and mutagenic industrial product or byproduct. The correlation between metal exposure and microsatellite instability (MSI) has been reported by several groups. In the present study, 50 C57BL/6J mice at 6 weeks of age were divided into five groups and intraperitoneally injected with 0, 0.25, 0.5, 1, or 2 mg/kg cadmium chloride quaque die alterna for 4 weeks. Then, the liver, kidney, testis, leukocytes, bone marrow, and small intestine were collected from the treated mice and weighed. Portions of these tissues were fixed for further histological analysis, and the remaining tissues were subjected to genomic DNA extraction for the analysis of a panel of 42 microsatellite markers. The liver and testis weight coefficients were significantly changed in the 1 and 2 mg/kg cadmium chloride-treated groups compared with the control group. Simultaneously, severe histopathologic changes in the liver and kidneys, along with a complete disorganization of testicular structure and obvious severe necrosis in the testes were observed in the cadmium-treated group. The cadmium accumulated in the liver and kidneys of the mice in all cadmium-treated groups; the tissue cadmium concentrations were significantly higher than those in the control group. After STR scanning, MSI was found at three loci (D15Mit5, D10Mit266, and DxMit172) in the kidneys and leukocytes of mice in the lower dose groups (0.25 and 0.5 mg/kg). In summary, we have successfully established a sub-chronic cadmium exposure model and confirmed that cadmium exposure can induce MSI in mice. We also identified two loci that could be regarded as "hotspots" of microsatellite mutation in mice.
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Affiliation(s)
- Xiaoyan Du
- Department of Laboratory Animal Science, School of Basic Medical Science, Capital Medical University, Beijing, 100069, China
| | - Tianfeng Lan
- Laboratory Animal Center, Jilin University, Changchun, Jilin, 130062, China
| | - Bao Yuan
- Department of Laboratory Animal Science, School of Basic Medical Science, Capital Medical University, Beijing, 100069, China
| | - Jian Chen
- Department of Laboratory Animal Science, School of Basic Medical Science, Capital Medical University, Beijing, 100069, China
| | - Jinping Hu
- Department of Laboratory Animal Science, School of Basic Medical Science, Capital Medical University, Beijing, 100069, China
| | - Wenzhi Ren
- Department of Laboratory Animal Science, School of Basic Medical Science, Capital Medical University, Beijing, 100069, China
| | - Zhenwen Chen
- Laboratory Animal Center, Jilin University, Changchun, Jilin, 130062, China
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5
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Bishak YK, Payahoo L, Osatdrahimi A, Nourazarian A. Mechanisms of Cadmium Carcinogenicity in the Gastrointestinal Tract. Asian Pac J Cancer Prev 2015; 16:9-21. [DOI: 10.7314/apjcp.2015.16.1.9] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Zhou Z, Wang C, Liu H, Huang Q, Wang M, Lei Y. Cadmium induced cell apoptosis, DNA damage, decreased DNA repair capacity, and genomic instability during malignant transformation of human bronchial epithelial cells. Int J Med Sci 2013; 10:1485-96. [PMID: 24046522 PMCID: PMC3775105 DOI: 10.7150/ijms.6308] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/23/2013] [Accepted: 08/12/2013] [Indexed: 12/31/2022] Open
Abstract
Cadmium and its compounds are well-known human carcinogens, but the mechanisms underlying the carcinogenesis are not entirely understood. Our study was designed to elucidate the mechanisms of DNA damage in cadmium-induced malignant transformation of human bronchial epithelial cells. We analyzed cell cycle, apoptosis, DNA damage, gene expression, genomic instability, and the sequence of exons in DNA repair genes in several kinds of cells. These cells consisted of untreated control cells, cells in the fifth, 15th, and 35th passage of cadmium-treated cells, and tumorigenic cells from nude mice using flow cytometry, Hoechst 33258 staining, comet assay, quantitative real-time polymerase chain reaction (PCR), Western blot analysis, random amplified polymorphic DNA (RAPD)-PCR, and sequence analysis. We observed a progressive increase in cell population of the G0/G1 phase of the cell cycle and the rate of apoptosis, DNA damage, and cadmium-induced apoptotic morphological changes in cerebral cortical neurons during malignant transformation. Gene expression analysis revealed increased expression of cell proliferation (PCNA), cell cycle (CyclinD1), pro-apoptotic activity (Bax), and DNA damage of the checkpoint genes ATM, ATR, Chk1, Chk2, Cdc25A. Decreased expression of the anti-apoptotic gene Bcl-2 and the DNA repair genes hMSH2, hMLH1, ERCC1, ERCC2, and hOGG1 was observed. RAPD-PCR revealed genomic instability in cadmium-exposed cells, and sequence analysis showed mutation of exons in hMSH2, ERCC1, XRCC1, and hOGG1 in tumorigenic cells. This study suggests that Cadmium can increase cell apoptosis and DNA damage, decrease DNA repair capacity, and cause mutations, and genomic instability leading to malignant transformation. This process could be a viable mechanism for cadmium-induced cancers.
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Affiliation(s)
- Zhiheng Zhou
- 1. School of public health, Guangzhou Medical University, Guangzhou 510182, People's Republic of China
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Oliveira H, Lopes T, Almeida T, Pereira MDL, Santos C. Cadmium-induced genetic instability in mice testis. Hum Exp Toxicol 2012; 31:1228-36. [PMID: 22699117 DOI: 10.1177/0960327112445937] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Cadmium is a well recognized carcinogenic, cytotoxic and mutagenic transition metal. Recent evidence suggests that the proteins participating in the DNA repair systems, especially in excision and mismatch repair (MMR), are sensitive targets of cadmium toxicity. Microsatellite instability (MSI) is regarded as one of the phenotypes of defective DNA MMR and, consequently, as a marker of high risk for cancer. The purpose of this work is to determine whether cadmium, in the form of cadmium chloride (CdCl(2)), may induce microsatellite mutations in murine testes. For this study, 2-month-old male ICR-CD1 mice were treated by a single subcutaneous injection of 1, 2 and 3 mg CdCl(2)/kg body weight and killed after 35 days. A panel of six microsatellite markers, previously reported as being the most sensitive in detecting MSI in murine tumours, was used in this study. The results show that CdCl(2) in the doses of 2 and 3 mg/kg induced a decrease in the testis weight and severe histopathologic changes with complete disorganization of testicular structure and evidences of severe necrosis. In addition, the animals exposed to the lowest CdCl(2) dose presented MSI in the testis. The results indicate the existence of MSI in at least two nuclear loci suggesting putative genotoxic effects induced by cadmium.
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Affiliation(s)
- Helena Oliveira
- Department of Biology, CICECO, University of Aveiro, Aveiro, Portugal.
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Bobrowska B, Skrajnowska D, Tokarz A. Effect of Cu supplementation on genomic instability in chemically-induced mammary carcinogenesis in the rat. J Biomed Sci 2011; 18:95. [PMID: 22192448 PMCID: PMC3267691 DOI: 10.1186/1423-0127-18-95] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2011] [Accepted: 12/22/2011] [Indexed: 11/23/2022] Open
Abstract
Backround The aim of the present study was to assess the effect of dietary supplementation (copper or copper and resveratrol) on the intensity of carcinogenesis and the frequency of microsatellite instability in a widely used model of mammary carcinogenesis induced in the rat by treatment with 7,12-dimethylbenz[a]anthracene (DMBA). Methods DNA was extracted from rat mammary cancers and normal tisues, amplified by PCR, using different polymorphic DNA markers and the reaction products were analyzed for microsatellite instability. Results It was found that irrespectively of the applied diet there was no inhibition of mammary carcinogenesis in the rats due to DMBA. Besides, in the groups supplemented with Cu (II) or Cu (II) and resveratrol the tumor formation was clearly accelerated. Unlike the animals that were fed with standard diet, the supplemented rats were characterized by the loss of heterozygosity of microsatellite D3Mgh9 in cancer tumors (by respectively 50 and 40%). When the animals received Cu (II) and resveratrol supplemented diet the occurrence of genomic instability was additionally found in their livers in the case of microsatellite D1Mgh6 (which was stable in the animals without dietary supplementation). Conclusions Identification of the underlying mechanisms by which dietary factors affect genomic stability might prove useful in the treatment of mammary cancer as well as in the incorporation of dietary factors into mammary cancer prevention strategies.
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Affiliation(s)
- Barbara Bobrowska
- Department of Bromatology, Medical University of Warsaw, Poland, Banacha 1, 02-097 Warsaw.
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El-Ghor AA, Noshy MM, Eid JI. Lead acetate and arsenic trioxide induce instability of microsatellites at three different fragile sites (6q21, 9q32–9q33 and 15p14) within the genome of the rat. MUTATION RESEARCH-GENETIC TOXICOLOGY AND ENVIRONMENTAL MUTAGENESIS 2011; 726:195-9. [DOI: 10.1016/j.mrgentox.2011.10.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2011] [Revised: 06/18/2011] [Accepted: 09/16/2011] [Indexed: 12/14/2022]
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10
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Ali I, Penttinen-Damdimopoulou PE, Mäkelä SI, Berglund M, Stenius U, Åkesson A, Håkansson H, Halldin K. Estrogen-like effects of cadmium in vivo do not appear to be mediated via the classical estrogen receptor transcriptional pathway. ENVIRONMENTAL HEALTH PERSPECTIVES 2010; 118:1389-94. [PMID: 20525538 PMCID: PMC2957917 DOI: 10.1289/ehp.1001967] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/19/2010] [Accepted: 06/04/2010] [Indexed: 05/25/2023]
Abstract
BACKGROUND Cadmium (Cd), a ubiquitous food contaminant, has been proposed to be an endocrine disruptor by inducing estrogenic responses in vivo. Several in vitro studies suggested that these effects are mediated via estrogen receptors (ERs). OBJECTIVE We performed this study to clarify whether Cd-induced effects in vivo are mediated via classical ER signaling through estrogen responsive element (ERE)-regulated genes or if other signaling pathways are involved. METHODS We investigated the estrogenic effects of cadmium chloride (CdCl2) exposure in vivo by applying the Organisation for Economic Co-operation and Development (OECD) rodent uterotrophic bioassay to transgenic ERE-luciferase reporter mice. Immature female mice were injected subcutaneously with CdCl2 (5, 50, or 500 µg/kg body weight) or with 17α-ethinylestradiol (EE2) on 3 consecutive days. We examined uterine weight and histology, vaginal opening, body and organ weights, Cd tissue retention, activation of mitogen-activated protein kinase (MAPK) pathways, and ERE-dependent luciferase expression. RESULTS CdCl2 increased the height of the uterine luminal epithelium in a dose-dependent manner without increasing the uterine wet weight, altering the timing of vaginal opening, or affecting the luciferase activity in reproductive or nonreproductive organs. However, we observed changes in the phosphorylation of mouse double minute 2 oncoprotein (Mdm2) and extracellular signal-regulated kinase (Erk1/2) in the liver after CdCl2 exposure. As we expected, EE2 advanced vaginal opening and increased uterine epithelial height, uterine wet weight, and luciferase activity in various tissues. CONCLUSION Our data suggest that Cd exposure induces a limited spectrum of estrogenic responses in vivo and that, in certain targets, effects of Cd might not be mediated via classical ER signaling through ERE-regulated genes.
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Affiliation(s)
- Imran Ali
- Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
| | | | - Sari I. Mäkelä
- Functional Foods Forum and Institute of Biomedicine, University of Turku, Turku, Finland
| | - Marika Berglund
- Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
| | - Ulla Stenius
- Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
| | - Agneta Åkesson
- Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
| | - Helen Håkansson
- Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
| | - Krister Halldin
- Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
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Liu J, Huang H, Zhang W, Li H. Cadmium-induced increase in uterine wet weight and its mechanism. ACTA ACUST UNITED AC 2010; 89:43-9. [PMID: 20151473 DOI: 10.1002/bdrb.20233] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND Cadmium (Cd) increases in uterine wet weight in rodents remain unclear and there are only a few studies that examined the effects of Cd on uterine morphology. It is unknown whether Cd induces a uterotrophic effect via its interaction with the estrogen receptor (ER). In our study, we compared the effects of cadmium chloride (CaCl(2)) on uterine wet weight and morphology to those of 17beta-estradiol in Sprague-Dawley (SD) rats. METHODS Forty-eight SD rats (23 days of age) were ectomized and randomly divided into six groups (eight rats per group): vehicle control (sterile saline solution), positive control (17beta-estradiol, 0.03 mg/kg in peanut oil), and CaCl(2) groups (0.0064, 0.032, 0.16, and 0.8 mg/kg, respectively). The animals were treated by daily intraperitoneal (i.p.) injection for 3 days. The uteri were removed and assessed for weight, morphology, and immunohistochemical analysis. RESULTS Compared to the control group, the uterine wet weight, the thickness of endomerium, the thickness of the stroma and the nucleus/cytoplasm ratio in the 17beta-estradiol-treated and 0.8 mg/kg-day CaCl(2)-treated groups changed (P<0.01 or P 0.05). The endometrial gland number, the uterine epithelial cell height, and the PCNA-positive expression in 17beta-estradiol-treated rats increased compared to that of the control (P<0.01), but not in the CaCl(2) dose groups. CONCLUSIONS These results indicate that cadmium may induce an increase in uterine wet weight. However, this effect is not similar to that caused by 17beta-estradiol, suggesting it is not via Ca-ER interactions.
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Affiliation(s)
- Jin Liu
- Department of Occupational and Environmental Health, University of Public Health, Fujian Medical University, Fuzhou, Fujian, P.R. China
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12
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Microsatellite instability at three microsatellite loci (D6mit3, D9mit2 and D15Mgh1) located in different common fragile sites of rats exposed to cadmium. MUTATION RESEARCH-GENETIC TOXICOLOGY AND ENVIRONMENTAL MUTAGENESIS 2010; 696:160-6. [DOI: 10.1016/j.mrgentox.2010.01.007] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2009] [Revised: 12/27/2009] [Accepted: 01/11/2010] [Indexed: 11/20/2022]
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13
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Singh KP, Kumari R, Pevey C, Jackson D, DuMond JW. Long duration exposure to cadmium leads to increased cell survival, decreased DNA repair capacity, and genomic instability in mouse testicular Leydig cells. Cancer Lett 2009; 279:84-92. [PMID: 19232459 DOI: 10.1016/j.canlet.2009.01.023] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2008] [Revised: 01/15/2009] [Accepted: 01/18/2009] [Indexed: 11/19/2022]
Abstract
Epidemiological and experimental studies have shown that cadmium is carcinogenic to human and experimental animals, however, the mechanism of cadmium-induced carcinogenesis is not clear. The aberrant expression of cell cycle and DNA repair genes resulting in increased cell proliferation and genomic instability are the characteristic features of cancer cells. The purpose of this study was to determine if exposure to cadmium can perturb cell proliferation/survival and causes genomic instability in TM3 cells, a mouse testicular Leydig cell line. The results of this study revealed that short-duration exposure to lower doses of cadmium significantly increase the growth of TM3 cells, whereas, higher doses are toxic and cause cell death. The long duration exposure to higher doses of cadmium, however, results in increased cell survival and acquisition of apoptotic resistance. Gene expression analysis by real-time PCR revealed increased expression of the anti-apoptotic gene Bcl-2, whereas decreased expression of pro-apoptotic gene Bax. Decreased expression of genes for maintenance of DNA methylation, DNMT1, and DNA repair, OGG1 and MYH, was also observed in cells exposed to cadmium for 24h. The random amplified polymorphic DNA (RAPD) assay revealed genomic instability in cells with chronic exposure to cadmium. The findings of this study indicate that mouse testicular Leydig cells adapt to chronic cadmium exposure by increasing cell survival through increased expression of Bcl-2, and decreased expression of Bax. The increased proliferation of cells with genomic instability may result in malignant transformation, and therefore, could be a viable mechanism for cadmium-induced cancers.
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Affiliation(s)
- Kamaleshwar P Singh
- Department of Biology, Texas Southern University, 3100 Cleburne Avenue, Houston, TX 77004, United States.
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Akesson A, Julin B, Wolk A. Long-term dietary cadmium intake and postmenopausal endometrial cancer incidence: a population-based prospective cohort study. Cancer Res 2008; 68:6435-41. [PMID: 18676869 DOI: 10.1158/0008-5472.can-08-0329] [Citation(s) in RCA: 195] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Environmental pollutants mimicking the effects of estrogen are suggested to contribute to the high incidence of hormone-related cancers, but supporting data are sparse. A potent estrogen-like activity of the pollutant cadmium, mediated via the estrogen receptor-alpha, has been shown in vivo. We prospectively examined the association between cadmium exposure and incidence of postmenopausal endometrial cancer. The Swedish Mammography Cohort is a population-based prospective cohort of 30,210 postmenopausal women free of cancer diagnose at baseline (1987) and who completed a food frequency questionnaire at baseline and in 1997. We estimated the dietary cadmium intake based on the questionnaire data and the cadmium content in all foods. During 16.0 years (484,274 person-years) of follow-up between the baseline and mid-2006, we ascertained 378 incident cases of endometrioid adenocarcinoma. The average estimated dietary cadmium intake was 15 mug/day (80% from cereals and vegetables). Cadmium intake was statistically significantly associated with increased risk of endometrial cancer in all women; the multivariate relative risk (RR) was 1.39 [95% confidence interval (CI), 1.04-1.86; P(trend) = 0.019], comparing highest tertile versus lowest. Among never-smoking women with body mass index (BMI) of <27 kg/m(2), the RR was 1.86 (95% CI, 1.13-3.08; P(trend) = 0.009). We observed a 2.9-fold increased risk (95% CI, 1.05-7.79) associated with long-term cadmium intake consistently above the median at both baseline 1987 and in 1997 in never-smoking women with low bioavailable estrogen (BMI of <27 kg/m(2) and nonusers of postmenopausal hormones). Our results support the hypothesis that cadmium may exert estrogenic effects and thereby increase the risk of hormone-related cancers.
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Affiliation(s)
- Agneta Akesson
- Division of Nutritional Epidemiology, Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden.
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