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Rainey NE, Armand AS, Petit PX. Sodium arsenite and arsenic trioxide differently affect the oxidative stress of lymphoblastoid cells: An intricate crosstalk between mitochondria, autophagy and cell death. PLoS One 2024; 19:e0302701. [PMID: 38728286 PMCID: PMC11086853 DOI: 10.1371/journal.pone.0302701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2023] [Accepted: 04/10/2024] [Indexed: 05/12/2024] Open
Abstract
Although the toxicity of arsenic depends on its chemical forms, few studies have taken into account the ambiguous phenomenon that sodium arsenite (NaAsO2) acts as a potent carcinogen while arsenic trioxide (ATO, As2O3) serves as an effective therapeutic agent in lymphoma, suggesting that NaAsO2 and As2O3 may act via paradoxical ways to either promote or inhibit cancer pathogenesis. Here, we compared the cellular response of the two arsenical compounds, NaAsO2 and As2O3, on the Burkitt lymphoma cell model, the Epstein Barr Virus (EBV)-positive P3HR1 cells. Using flow cytometry and biochemistry analyses, we showed that a NaAsO2 treatment induces P3HR1 cell death, combined with drastic drops in ΔΨm, NAD(P)H and ATP levels. In contrast, As2O3-treated cells resist to cell death, with a moderate reduction of ΔΨm, NAD(P)H and ATP. While both compounds block cells in G2/M and affect their protein carbonylation and lipid peroxidation, As2O3 induces a milder increase in superoxide anions and H2O2 than NaAsO2, associated to a milder inhibition of antioxidant defenses. By electron microscopy, RT-qPCR and image cytometry analyses, we showed that As2O3-treated cells display an overall autophagic response, combined with mitophagy and an unfolded protein response, characteristics that were not observed following a NaAsO2 treatment. As previous works showed that As2O3 reactivates EBV in P3HR1 cells, we treated the EBV- Ramos-1 cells and showed that autophagy was not induced in these EBV- cells upon As2O3 treatment suggesting that the boost of autophagy observed in As2O3-treated P3HR1 cells could be due to the presence of EBV in these cells. Overall, our results suggest that As2O3 is an autophagic inducer which action is enhanced when EBV is present in the cells, in contrast to NaAsO2, which induces cell death. That's why As2O3 is combined with other chemicals, as all-trans retinoic acid, to better target cancer cells in therapeutic treatments.
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Affiliation(s)
- Nathan Earl Rainey
- CNRS UMR 8003 Paris University, SSPIN, Neuroscience Institute, Team “Mitochondria, Apoptosis and Autophagy Signaling”, Campus Saint-Germain, Paris, France
| | - Anne-Sophie Armand
- INSERM U1151, Institut Necker Enfants Malades (INEM), Campus Necker, Université Paris Cité, Paris, France
| | - Patrice X. Petit
- CNRS UMR 8003 Paris University, SSPIN, Neuroscience Institute, Team “Mitochondria, Apoptosis and Autophagy Signaling”, Campus Saint-Germain, Paris, France
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2
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Sun J, Wu M, Wang L, Wang P, Xiao T, Wang S, Liu Q. miRNA-21, which disrupts metabolic reprogramming to facilitate CD4 + T cell polarization toward the Th2 phenotype, accelerates arsenite-induced hepatic fibrosis. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2022; 248:114321. [PMID: 36427370 DOI: 10.1016/j.ecoenv.2022.114321] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2022] [Revised: 11/02/2022] [Accepted: 11/19/2022] [Indexed: 06/16/2023]
Abstract
Elevated levels of arsenic may be present in groundwater, and long-term exposure to arsenic increases hepatic fibrosis. T helper 2 (Th2) cells are involved in the fibrotic cascade, and cell metabolism is a regulatory factor participating in CD4+ T cell differentiation and function. However, the mechanism for Th2 cell regulation of arsenite-induced hepatic fibrosis is not fully understood. In present study, for arsenite-fed mice, activated hepatic stellate cells may be involved in the infiltration of CD4+ T cells, accompanied by up-regulation of GATA3, a transcription factor, and IL-13, the major Th2 cytokine. Exposed to arsenite, Jurkat cells had increased aerobic glycolysis to promote the cell cycle and cell proliferation. Further, this process elevated levels of marker molecules, including those of the Th2 paradigm characterized by GATA3, IL-4, and IL-13. LX-2 cells were activated when treated with culture medium from Jurkat cells exposed to arsenite. miR-21 may be a therapeutic target for arsenite-induced hepatic fibrosis. In vitro, miR-21 knock-down caused inhibition of the PTEN/PI3K/AKT pathway induced by arsenite. It also reversed the elevated glycolysis and the accelerated cell cycle and cell proliferation. Indeed, this alteration led to diminished expression of GATA3, IL-4, and IL-13 in T cells differentiated under Th2 conditions, which inhibits activation of LX-2 cells. Consistent with the results in vitro, miR-21 knock-out in mice reversed hepatic fibrosis and attenuated the levels of GATA3 and IL-13 induced by arsenite. These findings indicate that miR-21 regulates the glycolysis of CD4+ T cells through the PTEN/PI3K/AKT pathway to accelerate the cell cycle, thereby facilitating CD4+ T cell polarization toward Th2 and releasing the fibrogenic factor IL-13, which participates in arsenite-associated hepatic fibrosis. Inhibition of Th2 polarization of CD4+T cells or miR-21 could be a therapeutic strategy to combat hepatic fibrosis caused by exposure to arsenic.
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Affiliation(s)
- Jing Sun
- Center for Global Health, The Key Laboratory of Modern Toxicology, Ministry of Education, School of Public Health, Suzhou Institute of Public Health, Gusu School, Nanjing Medical University, Nanjing 211166, Jiangsu, People's Republic of China; Department of Nutrition, Clinical Assessment Center of Functional Food, Affiliated Hospital of Jiangnan University, Wuxi 214122, Jiangsu, People's Republic of China
| | - Meng Wu
- Center for Global Health, The Key Laboratory of Modern Toxicology, Ministry of Education, School of Public Health, Suzhou Institute of Public Health, Gusu School, Nanjing Medical University, Nanjing 211166, Jiangsu, People's Republic of China; Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center for Cancer Medicine, School of Public Health, Nanjing Medical University, Nanjing 211166, Jiangsu, People's Republic of China
| | - Li Wang
- Department of Toxicology, School of Public Health, Baotou Medical College, Baotou 014040, Inner Mongolia, People's Republic of China
| | - Peiwen Wang
- Center for Global Health, The Key Laboratory of Modern Toxicology, Ministry of Education, School of Public Health, Suzhou Institute of Public Health, Gusu School, Nanjing Medical University, Nanjing 211166, Jiangsu, People's Republic of China; Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center for Cancer Medicine, School of Public Health, Nanjing Medical University, Nanjing 211166, Jiangsu, People's Republic of China
| | - Tian Xiao
- Center for Global Health, The Key Laboratory of Modern Toxicology, Ministry of Education, School of Public Health, Suzhou Institute of Public Health, Gusu School, Nanjing Medical University, Nanjing 211166, Jiangsu, People's Republic of China; Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center for Cancer Medicine, School of Public Health, Nanjing Medical University, Nanjing 211166, Jiangsu, People's Republic of China
| | - Suhua Wang
- Department of Toxicology, School of Public Health, Baotou Medical College, Baotou 014040, Inner Mongolia, People's Republic of China.
| | - Qizhan Liu
- Center for Global Health, The Key Laboratory of Modern Toxicology, Ministry of Education, School of Public Health, Suzhou Institute of Public Health, Gusu School, Nanjing Medical University, Nanjing 211166, Jiangsu, People's Republic of China; Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center for Cancer Medicine, School of Public Health, Nanjing Medical University, Nanjing 211166, Jiangsu, People's Republic of China.
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3
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Nagai K, Hou L, Li L, Nguyen B, Seale T, Shirley C, Ma H, Levis M, Ghiaur G, Duffield A, Small D. Combination of ATO with FLT3 TKIs eliminates FLT3/ITD+ leukemia cells through reduced expression of FLT3. Oncotarget 2018; 9:32885-32899. [PMID: 30250637 PMCID: PMC6152471 DOI: 10.18632/oncotarget.25972] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2018] [Accepted: 08/02/2018] [Indexed: 12/02/2022] Open
Abstract
Acute myeloid leukemia (AML) patients with FLT3/ITD mutations have a poor prognosis. Monotherapy with selective FLT3 tyrosine kinase inhibitors (TKIs) have shown transient and limited efficacy due to the development of resistance. Arsenic trioxide (ATO, As2O3) has been proven effective in treating acute promyelocytic leukemia (APL) and has shown activity in some cases of refractory and relapsed AML and other hematologic malignances. We explored the feasibility of combining FLT3 TKIs with ATO in the treatment of FLT3/ITD+ leukemias. The combination of FLT3 TKIs with ATO showed synergistic effects in reducing proliferation, viability and colony forming ability, and increased apoptosis in FLT3/ITD+ cells and primary patient samples. In contrast, no cooperativity was observed against wild-type FLT3 leukemia cells. ATO reduced expression of FLT3 RNA and its upstream transcriptional regulators (HOXA9, MEIS1), and induced poly-ubiquitination and degradation of the FLT3 protein, partly through reducing its binding with USP10. ATO also synergizes with FLT3 TKIs to inactivate FLT3 autophosphorylation and phosphorylation of its downstream signaling targets, including STAT5, AKT and ERK. Furthermore, ATO combined with sorafenib, a FLT3 TKI, in vivo reduced growth of FLT3/ITD+ leukemia cells in NSG recipients. In conclusion, these results suggest that ATO is a potential candidate to study in clinical trials in combination with FLT3 TKIs to improve the treatment of FLT3/ITD+ leukemia.
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Affiliation(s)
- Kozo Nagai
- Department of Oncology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Lihong Hou
- Department of Oncology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Li Li
- Department of Oncology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Bao Nguyen
- Department of Oncology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Tessa Seale
- Department of Oncology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Courtney Shirley
- Department of Oncology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Hayley Ma
- Department of Oncology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Mark Levis
- Department of Oncology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Gabriel Ghiaur
- Department of Oncology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Amy Duffield
- Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Donald Small
- Department of Oncology, Johns Hopkins University School of Medicine, Baltimore, MD, USA.,Department of Pediatrics, Johns Hopkins University School of Medicine, Baltimore, MD, USA
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Ooki A, Begum A, Marchionni L, VandenBussche CJ, Mao S, Kates M, Hoque MO. Arsenic promotes the COX2/PGE2-SOX2 axis to increase the malignant stemness properties of urothelial cells. Int J Cancer 2018; 143:113-126. [PMID: 29396848 PMCID: PMC5938132 DOI: 10.1002/ijc.31290] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2017] [Revised: 12/22/2017] [Accepted: 01/25/2018] [Indexed: 12/14/2022]
Abstract
Chronic arsenic exposure is associated with the development of urothelial carcinoma of the bladder (UCB). To elucidate the contribution of arsenic exposure to urothelial cancer stem cell (CSC) generation, we established an in vitro stepwise malignant model transformed by chronically exposing human urothelial cells to arsenic. Using this model, we found that chronic arsenic exposure endows urothelial cells with malignant stemness properties including increased expression of stemness-related factors such as SOX2, sphere formation, self-renewal, invasion and chemoresistance. SOX2 was gradually and irreversibly overexpressed in line with acquired sphere-forming and self-renewal abilities. Following gene set enrichment analyses of arsenic-exposed and arsenic-unexposed cells, we found COX2 as an enriched gene for oncogenic signature. Mechanistically, arsenic-induced COX2/PGE2 increases SOX2 expression that eventually promotes malignant stem cell generation and repopulation. In urine samples from 90 subjects exposed to arsenic and 91 control subjects, we found a significant linear correlation between SOX2 and COX2 expression and the potential of SOX2 and COX2 expression as urinary markers to detect subjects exposed to arsenic. Furthermore, the combination marker yielded a high sensitivity for UCB detection in a separate cohort. Finally, our in vitro model exhibits basal-type molecular features and dual inhibition of EGFR and COX2 attenuated stem cell enrichment more efficiently than an EGFR inhibitor alone. In conclusion, the COX2/PGE2-SOX2 axis promotes arsenic-induced malignant stem cell transformation. In addition, our findings indicate the possible use of SOX2 and COX2 expression as urinary markers for the risk stratification and detection of UCB.
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Affiliation(s)
- Akira Ooki
- Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins University School of Medicine, Baltimore, Maryland 21231, USA
| | - Asma Begum
- The Sidney Kimmel Comprehensive Cancer, Johns Hopkins University, Baltimore, Maryland 21231, USA
| | - Luigi Marchionni
- Department of Oncology, Johns Hopkins University School of Medicine, Baltimore, Maryland 21231, USA
| | | | - Shifeng Mao
- Allegheny Health Network Cancer Institute, Pittsburgh, PA 15212, USA
| | - Max Kates
- Department of Urology, Johns Hopkins University School of Medicine, Baltimore, Maryland 21287, USA
| | - Mohammad Obaidul Hoque
- Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins University School of Medicine, Baltimore, Maryland 21231, USA
- Department of Oncology, Johns Hopkins University School of Medicine, Baltimore, Maryland 21231, USA
- Department of Urology, Johns Hopkins University School of Medicine, Baltimore, Maryland 21287, USA
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5
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Elia AC, Magara G, Caruso C, Masoero L, Prearo M, Arsieni P, Caldaroni B, Dörr AJM, Scoparo M, Salvati S, Brizio P, Squadrone S, Abete MC. A comparative study on subacute toxicity of arsenic trioxide and dimethylarsinic acid on antioxidant status in Crandell Rees feline kidney (CRFK), human hepatocellular carcinoma (PLC/PRF/5), and epithelioma papulosum cyprini (EPC) cell lines. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH. PART A 2018; 81:333-348. [PMID: 29498595 DOI: 10.1080/15287394.2018.1442758] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2017] [Revised: 02/15/2018] [Accepted: 02/15/2018] [Indexed: 05/29/2023]
Abstract
Arsenic (As) is a global contaminant of terrestrial and aquatic environments posing concern for environmental and human health. The effects of subacute concentrations of arsenic trioxide (AsIII) and dimethylarsinic acid (DMAV) were examined using Crandell Rees feline kidney (CRFK), human hepatocellular carcinoma (PLC/PRF/5), and epithelioma papulosum cyprini (EPC). Whole monolayer with suffering cells (confluence 100%, pyknosis and refractive cells; value scale = 2) led to identification of subacute As concentrations for the three cell lines. The selected AsIII concentrations were 1.33 µM for CRFK and 33.37 µM for PLC/PRF/5 and EPC, at 48 hr time point. The selected DMAV concentrations were 0.67 mM for PLC/PRF/5, 1.33 mM for CRFK, and 2.67 mM for EPC for 48 hr. Unlike the AsIII test, the three cell lines did not exhibit marked susceptibility to DMAV-mediated toxicity. Several oxidative stress biomarker levels, directly or indirectly associated with reactive oxygen species (ROS) elimination including superoxide dismutase, catalase, glutathione peroxidases, glutathione reductase, glutathione S-transferase, glyoxalase I, glyoxalase II, and total glutathione, were determined in the three cell lines at 24 and 48 hr. Antioxidant responses in metal-treated cells were significantly altered compared to controls, suggesting a perturbation of redox state. The weakening of antioxidant pathway in either healthy or tumoral cells was greater using AsIII than DMAV. Differences in level of several oxidative stress biomarkers suggest that the oxidative stress mechanism induced by AsIII is distinctly different from DMAV. Multifaceted mechanisms of action underlying ROS generation in tumor and nontumor cells versus AsIII and DMAV exposure are thus involved. Since As-mediated toxicity is quite complex, more data regarding both oxidant-enhancement and oxidant-lowering strategies may be useful to improve knowledge regarding the influence of As on human and animal cells.
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Affiliation(s)
- Antonia Concetta Elia
- a Dipartimento di Chimica, Biologia e Biotecnologie , Università degli Studi di Perugia , Perugia , Italy
| | - Gabriele Magara
- a Dipartimento di Chimica, Biologia e Biotecnologie , Università degli Studi di Perugia , Perugia , Italy
| | - Claudio Caruso
- b Istituto Zooprofilattico Sperimentale del Piemonte , Torino , Italy
| | - Loretta Masoero
- b Istituto Zooprofilattico Sperimentale del Piemonte , Torino , Italy
| | - Marino Prearo
- b Istituto Zooprofilattico Sperimentale del Piemonte , Torino , Italy
| | - Paola Arsieni
- b Istituto Zooprofilattico Sperimentale del Piemonte , Torino , Italy
| | - Barbara Caldaroni
- a Dipartimento di Chimica, Biologia e Biotecnologie , Università degli Studi di Perugia , Perugia , Italy
| | | | - Melissa Scoparo
- a Dipartimento di Chimica, Biologia e Biotecnologie , Università degli Studi di Perugia , Perugia , Italy
| | - Stefania Salvati
- b Istituto Zooprofilattico Sperimentale del Piemonte , Torino , Italy
| | - Paola Brizio
- b Istituto Zooprofilattico Sperimentale del Piemonte , Torino , Italy
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Petruk G, Donadio G, Lanzilli M, Isticato R, Monti DM. Alternative use of Bacillus subtilis spores: protection against environmental oxidative stress in human normal keratinocytes. Sci Rep 2018; 8:1745. [PMID: 29379084 PMCID: PMC5788939 DOI: 10.1038/s41598-018-20153-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2017] [Accepted: 01/15/2018] [Indexed: 12/25/2022] Open
Abstract
Inorganic trivalent arsenic is a major environmental pollutant and exposure to human results in many pathologies, including keratosis and carcinoma. Here, we analyzed the effects of B. subtilis spores on human normal keratinocytes in the presence of sodium arsenite oxidative stress. Pre-treatment of cells with spores before inducing oxidative stress was able to keep normal levels of intracellular ROS, GSH and lipid peroxidation, as well as to inhibit the activation of the MAPK cascade. Moreover, spores showed a positive effect on cell proliferation, probably due to their binding on the cell surface and the activation of intracellular catalases. We found that spores exert their protective effect by the nuclear translocation of Nrf-2, involved in the activation of stress response genes. This, in turn, resulted in a protective effect against sodium arsenite stress injury, as oxidative stress markers were reported to physiological levels when cells were stressed before incubating them with spores. Therefore, B. subtilis spores can be considered as a new agent to counteract oxidative stress on normal human keratinocytes.
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Affiliation(s)
- Ganna Petruk
- Department of Chemical Sciences, University of Naples Federico II, Complesso Universitario Monte Sant'Angelo, via Cinthia 4, 80126, Naples, Italy
| | - Giuliana Donadio
- Department of Biology, University of Naples Federico II, Complesso Universitario Monte Sant'Angelo, via Cinthia 4, 80126, Naples, Italy
| | - Mariamichela Lanzilli
- Department of Biology, University of Naples Federico II, Complesso Universitario Monte Sant'Angelo, via Cinthia 4, 80126, Naples, Italy
| | - Rachele Isticato
- Department of Biology, University of Naples Federico II, Complesso Universitario Monte Sant'Angelo, via Cinthia 4, 80126, Naples, Italy.
| | - Daria Maria Monti
- Department of Chemical Sciences, University of Naples Federico II, Complesso Universitario Monte Sant'Angelo, via Cinthia 4, 80126, Naples, Italy. .,Istituto Nazionale di Biostrutture e Biosistemi (INBB), Rome, Italy.
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Chen H, Gu S, Dai H, Li X, Zhang Z. Dihydroartemisinin Sensitizes Human Lung Adenocarcinoma A549 Cells to Arsenic Trioxide via Apoptosis. Biol Trace Elem Res 2017; 179:203-212. [PMID: 28261759 DOI: 10.1007/s12011-017-0975-5] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/18/2016] [Accepted: 02/15/2017] [Indexed: 11/29/2022]
Abstract
Recent studies have shown that arsenic trioxide (ATO) is an effective anti-cancer drug for treatment of acute promyelocytic leukemia and other types of human cancer. However, we have found that lung cancer cells constantly develop a high level of resistance to ATO. In this study, we have explored a possibility of combination of dihydroartemisinin (DHA) and ATO treatments to reduce ATO resistance of lung cancer cells. We determined the combinatory effects of DHA and ATO on cytotoxicity of human lung adenocarcinoma (A549) cells. We showed that co-exposure to DHA and ATO of A549 cells synergistically increased the cytotoxicity and apoptotic cell death in the cells. We found that the synergistic effect of DHA and ATO in promoting apoptosis mainly resulted from increased cellular level of reactive oxygen species (ROS) and DNA damage. ATO alone only exerted moderate growth inhibitory effects on A549 cells. The results indicate that DHA can significantly sensitize ATO-induced cytotoxicity of A549 lung cancer cells through apoptosis mediated by ROS-induced DNA damage. Interestingly, we found that the combinatory treatment of DHA and ATO did not result in significant adverse effects in normal human bronchial epithelial (HBE) cells. Our results further provide evidence for the potential application of combinatory effects of DHA and ATO as a safe therapy for human lung cancer.
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Affiliation(s)
- Hongyu Chen
- Department of Environmental Health and Occupational Medicine, West China School of Public Health, Sichuan University, No. 16, Section 3, Renmin Nan Road, Chengdu, 610041, Sichuan, People's Republic of China
| | - Shiyan Gu
- Department of Environmental Health and Occupational Medicine, West China School of Public Health, Sichuan University, No. 16, Section 3, Renmin Nan Road, Chengdu, 610041, Sichuan, People's Republic of China
| | - Huangmei Dai
- Department of Environmental Health and Occupational Medicine, West China School of Public Health, Sichuan University, No. 16, Section 3, Renmin Nan Road, Chengdu, 610041, Sichuan, People's Republic of China
| | - Xinyang Li
- Department of Environmental Health and Occupational Medicine, West China School of Public Health, Sichuan University, No. 16, Section 3, Renmin Nan Road, Chengdu, 610041, Sichuan, People's Republic of China
| | - Zunzhen Zhang
- Department of Environmental Health and Occupational Medicine, West China School of Public Health, Sichuan University, No. 16, Section 3, Renmin Nan Road, Chengdu, 610041, Sichuan, People's Republic of China.
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Akanda MR, Kim IS, Ahn D, Tae HJ, Tian W, Nam HH, Choo BK, Park BY. In Vivo and In Vitro Hepatoprotective Effects of Geranium koreanum Methanolic Extract via Downregulation of MAPK/Caspase-3 Pathway. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE : ECAM 2017; 2017:8137627. [PMID: 28757890 PMCID: PMC5516716 DOI: 10.1155/2017/8137627] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/02/2017] [Accepted: 06/05/2017] [Indexed: 12/13/2022]
Abstract
Geranium koreanum (GK) is an indigenous Chinese herbal medicine widely used for the treatment of various inflammation and liver disorders. However, the exact mechanism of action of GK remains unknown. This study aimed to investigate the protective effect and related molecular mechanism of GK on NaAsO2-induced cytotoxicity in HepG2 cells and liver damage in mice. The cytoprotective role of GK was assessed on HepG2 cells using MTT assay. Oxidative stress and lactate dehydrogenase levels were measured with ROS and LDH assay. Histopathology and serum enzymes levels were estimated. The molecular mechanism was evaluated by qPCR and immunoblotting to ensure the hepatoprotective role of GK against NaAsO2 intoxication in mice. We found cotreatment with GK significantly attenuated NaAsO2-induced cell viability loss, intracellular ROS, and LDH release. Hepatic histopathology and serum biochemical parameters, ALT, and AST were notably improved by cotreatment with GK. Beside, GK markedly altered both mRNA and protein expression level of MAPK. The proapoptotic and antiapoptotic protein Bax/Bcl-2 ratio was significantly regulated by GK. Moreover, GK remarkably suppressed the postapoptotic transcription protein cleaved caspase-3 expression. The present study reveals that GK possesses hepatoprotective activity which is probably involved in the modulation of the MAPK/caspase-3 pathway.
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Affiliation(s)
- Md Rashedunnabi Akanda
- College of Veterinary Medicine and Biosafety Research Institute, Chonbuk National University, Iksan 54596, Republic of Korea
- Department of Pharmacology and Toxicology, Sylhet Agricultural University, Sylhet 3100, Bangladesh
| | - In-Shik Kim
- College of Veterinary Medicine and Biosafety Research Institute, Chonbuk National University, Iksan 54596, Republic of Korea
| | - Dongchoon Ahn
- College of Veterinary Medicine and Biosafety Research Institute, Chonbuk National University, Iksan 54596, Republic of Korea
| | - Hyun-Jin Tae
- College of Veterinary Medicine and Biosafety Research Institute, Chonbuk National University, Iksan 54596, Republic of Korea
| | - Weishun Tian
- College of Veterinary Medicine and Biosafety Research Institute, Chonbuk National University, Iksan 54596, Republic of Korea
| | - Hyeon-Hwa Nam
- Department of Crop Science & Biotechnology, Chonbuk National University, Jeonju 54896, Republic of Korea
| | - Byung-Kil Choo
- Department of Crop Science & Biotechnology, Chonbuk National University, Jeonju 54896, Republic of Korea
| | - Byung-Yong Park
- College of Veterinary Medicine and Biosafety Research Institute, Chonbuk National University, Iksan 54596, Republic of Korea
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9
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Teixeira MZ. Therapeutic use of the rebound effect of modern drugs: "New homeopathic medicines". Rev Assoc Med Bras (1992) 2017; 63:100-108. [PMID: 28355369 DOI: 10.1590/1806-9282.63.02.100] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2016] [Accepted: 07/09/2016] [Indexed: 11/22/2022] Open
Abstract
The homeopathic treatment is based on the principle of therapeutic similitude, employing medicines that cause certain disorders to treat similar manifestations, stimulating a reaction of the organism against its own ailments. The occurrence of this secondary reaction of the organism, opposite in nature to the primary action of the medicines, is evidenced in the study of the rebound (paradoxical) effect of several classes of modern drugs. In this work, in addition to substantiate the principle of similitude before the experimental and clinical pharmacology, we suggest a proposal to employ hundreds of conventional drugs according to homeopathic method, applying the therapeutic similitude between the adverse events of medicines and the clinical manifestations of patients. Describing existing lines of research and a specific method for the therapeutic use of the rebound effect of modern drugs (http://www.newhomeopathicmedicines.com), we hope to minimize prejudices related to the homeopathy and contribute to a broadening of the healing art.
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Affiliation(s)
- Marcus Zulian Teixeira
- MD, PhD, Postdoctoral Student of the Department of Obstetrics and Gynecology, Faculdade de Medicina da Universidade de São Paulo (FMUSP). Coordinator of the Elective Discipline Fundamentals of Homeopathy (MCM0773), FMUSP, São Paulo, SP, Brazil
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10
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Teixeira MZ. Biological therapies (immunomodulatory drugs), worsening of psoriasis and rebound effect: new evidence of similitude. HOMEOPATHY 2016; 105:344-355. [PMID: 27914574 DOI: 10.1016/j.homp.2016.09.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2015] [Revised: 04/25/2016] [Accepted: 09/14/2016] [Indexed: 02/06/2023]
Abstract
BACKGROUND Employing the secondary action or adaptative reaction of the organism as therapeutic response, homeopathy uses the treatment by similitude (similia similibus curentur) administering to sick individuals the medicines that caused similar symptoms in healthy individuals. Such homeostatic or paradoxical reaction of the organism is scientifically explained through the rebound effect of drugs, which cause worsening of symptoms after withdrawal of several palliative treatments. Despite promoting an improvement in psoriasis at the beginning of the treatment, modern biological therapies provoke worsening of the psoriasis (rebound psoriasis) after discontinuation of drugs. METHOD Exploratory qualitative review of the literature on the occurrence of the rebound effect with the use of immunomodulatory drugs [T-cell modulating agents and tumor necrosis factor (TNF) inhibitors drugs] in the treatment of psoriasis. RESULTS Several researches indicate the rebound effect as the mechanism of worsening of psoriasis with the use of efalizumab causing the suspension of its marketing authorization in 2009, in view of some severe cases. Other studies also have demonstrated the occurrence of rebound psoriasis with the use of alefacept, etanercept and infliximab. CONCLUSION As well as studied in other classes of drugs, the rebound effect of biologic agents supports the principle of similitude (primary action of the drugs followed by secondary action and opposite of the organism).
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Affiliation(s)
- Marcus Zulian Teixeira
- Department of Internal Medicine, Faculty of Medicine, University of São Paulo, São Paulo, Brazil.
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11
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Teixeira MZ, Podgaec S, Baracat EC. Protocol of randomized controlled trial of potentized estrogen in homeopathic treatment of chronic pelvic pain associated with endometriosis. HOMEOPATHY 2016; 105:240-249. [PMID: 27473545 DOI: 10.1016/j.homp.2016.03.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2015] [Revised: 03/01/2016] [Accepted: 03/09/2016] [Indexed: 11/30/2022]
Abstract
BACKGROUND Endometriosis is a chronic inflammatory disease that causes difficult-to-treat pelvic pain. Thus being, many patients seek help in complementary and alternative medicine, including homeopathy. The effectiveness of homeopathic treatment for endometriosis is controversial due to the lack of evidences in the literature. The aim of the present randomized controlled trial is to assess the efficacy of potentized estrogen compared to placebo in the treatment of chronic pelvic pain associated with endometriosis. METHODS/DESIGN The present is a randomized, double-blind, placebo-controlled trial of a homeopathic medicine individualized according to program 'New Homeopathic Medicines: use of modern drugs according to the principle of similitude' (http://newhomeopathicmedicines.com). Women with endometriosis, chronic pelvic pain and a set of signs and symptoms similar to the adverse events caused by estrogen were recruited at the Endometriosis Unit of Division of Clinical Gynecology, Clinical Hospital, School of Medicine, University of São Paulo (Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo - HCFMUSP). The participants were selected based on the analysis of their medical records and the application of self-report structured questionnaires. A total of 50 women meeting the eligibility criteria will be randomly allocated to receive potentized estrogen or placebo. The primary clinical outcome measure will be severity of chronic pelvic pain. Statistical analysis will be performed on the intention-to-treat and per-protocol approaches comparing the effect of the homeopathic medicine versus placebo after 24 weeks of intervention. DISCUSSION The present study was approved by the research ethics committee of HCFMUSP and the results are expected in 2016. TRIAL REGISTRATION ClinicalTrials.gov Identifier: https://clinicaltrials.gov/ct2/show/NCT02427386.
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Affiliation(s)
- Marcus Zulian Teixeira
- Department of Obstetrics and Gynecology, School of Medicine, University of Sao Paulo, Sao Paulo, Brazil.
| | - Sérgio Podgaec
- Department of Obstetrics and Gynecology, School of Medicine, University of Sao Paulo, Sao Paulo, Brazil
| | - Edmund Chada Baracat
- Department of Obstetrics and Gynecology, School of Medicine, University of Sao Paulo, Sao Paulo, Brazil
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12
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Evaluation of the change in sphingolipids in the human multiple myeloma cell line U266 and gastric cancer cell line MGC-803 treated with arsenic trioxide. J Chromatogr B Analyt Technol Biomed Life Sci 2015; 1004:98-107. [DOI: 10.1016/j.jchromb.2015.09.015] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2015] [Revised: 09/09/2015] [Accepted: 09/13/2015] [Indexed: 01/05/2023]
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13
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Muenyi CS, Ljungman M, States JC. Arsenic Disruption of DNA Damage Responses-Potential Role in Carcinogenesis and Chemotherapy. Biomolecules 2015; 5:2184-93. [PMID: 26404387 PMCID: PMC4693233 DOI: 10.3390/biom5042184] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2015] [Revised: 09/06/2015] [Accepted: 09/09/2015] [Indexed: 12/26/2022] Open
Abstract
Arsenic is a Class I human carcinogen and is widespread in the environment. Chronic arsenic exposure causes cancer in skin, lung and bladder, as well as in other organs. Paradoxically, arsenic also is a potent chemotherapeutic against acute promyelocytic leukemia and can potentiate the cytotoxic effects of DNA damaging chemotherapeutics, such as cisplatin, in vitro. Arsenic has long been implicated in DNA repair inhibition, cell cycle disruption, and ubiquitination dysregulation, all negatively impacting the DNA damage response and potentially contributing to both the carcinogenic and chemotherapeutic potential of arsenic. Recent studies have provided mechanistic insights into how arsenic interferes with these processes including disruption of zinc fingers and suppression of gene expression. This review discusses these effects of arsenic with a view toward understanding the impact on the DNA damage response.
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Affiliation(s)
- Clarisse S Muenyi
- Department of Pharmacology and Toxicology, University of Louisville School of Medicine, Louisville, KY 40292, USA.
| | - Mats Ljungman
- Departments of Radiation Oncology and Environmental Health Sciences, University of Michigan, Ann Arbor, MI 48109-2800, USA.
| | - J Christopher States
- Department of Pharmacology and Toxicology, University of Louisville School of Medicine, Louisville, KY 40292, USA.
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14
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Ninomiya Y, Cui X, Yasuda T, Wang B, Yu D, Sekine-Suzuki E, Nenoi M. Arsenite induces premature senescence via p53/p21 pathway as a result of DNA damage in human malignant glioblastoma cells. BMB Rep 2015; 47:575-80. [PMID: 24499675 PMCID: PMC4261516 DOI: 10.5483/bmbrep.2014.47.10.254] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2013] [Indexed: 01/17/2023] Open
Abstract
In this study, we investigate whether arsenite-induced DNA damage leads to p53-dependent premature senescence using human glioblastoma cells with p53-wild type (U87MG-neo) and p53 deficient (U87MG-E6). A dose dependent relationship between arsenite and reduced cell growth is demonstrated, as well as induced γH2AX foci formation in both U87MG-neo and U87MG-E6 cells at low concentrations of arsenite. Senescence was induced by arsenite with senescence-associated β-galactosidase staining. Dimethyl- and trimethyl-lysine 9 of histone H3 (H3DMK9 and H3TMK9) foci formation was accompanied by p21 accumulation only in U87MG-neo but not in U87MG-E6 cells. This suggests that arsenite induces premature senescence as a result of DNA damage with heterochromatin forming through a p53/p21 dependent pathway. p21 and p53 siRNA consistently decreased H3TMK9 foci formation in U87M G-neo but not in U87MG-E6 cells after arsenite treatment. Taken together, arsenite reduces cell growth independently of p53 and induces premature senescence via p53/p21-dependent pathway following DNA damage. [BMB Reports 2014; 47(10): 575-580]
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Affiliation(s)
- Yasuharu Ninomiya
- Radiation Risk Reduction Research Program, Research Center for Radiation Protection, National Institute of Radiological Sciences, Chiba 263-8555, Japan
| | - Xing Cui
- Medical Physics Research Program, Research Center for Charged Particle Therapy, National Institute of Radiological Sciences, Chiba 263-8555, Japan
| | - Takeshi Yasuda
- Radiation Emergency Medicine Research Program, Research Center for Radiation Emergency Medicine, National Institute of Radiological Sciences, Chiba 263-8555, Japan
| | - Bing Wang
- Radiation Risk Reduction Research Program, Research Center for Radiation Protection, National Institute of Radiological Sciences, Chiba 263-8555, Japan
| | - Dong Yu
- School of Radiological Medicine and Protection, Medical College of Soochow University, 199 Ren Ai Rd, Suzhou Industrial Park, Suzhou 215123, China
| | - Emiko Sekine-Suzuki
- Research Program for Application of Heavy ions and Medical Science, Research Center for Charged Particle Therapy, National Institute of Radiological Sciences, Chiba 263-8555, Japan
| | - Mitsuru Nenoi
- Radiation Risk Reduction Research Program, Research Center for Radiation Protection, National Institute of Radiological Sciences, Chiba 263-8555, Japan
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15
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Chen C, Jiang X, Lai Y, Liu Y, Zhang Z. Resveratrol protects against arsenic trioxide-induced oxidative damage through maintenance of glutathione homeostasis and inhibition of apoptotic progression. ENVIRONMENTAL AND MOLECULAR MUTAGENESIS 2015; 56:333-46. [PMID: 25339131 PMCID: PMC4376608 DOI: 10.1002/em.21919] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2014] [Accepted: 10/07/2014] [Indexed: 05/22/2023]
Abstract
Arsenic trioxide (As2 O3 ) is commonly used to treat acute promyelocytic leukemia and solid tumors. However, the clinical application of the agent is limited by its cyto- and genotoxic effects on normal cells. Thus, relief of As2 O3 toxicity in normal cells is essentially necessary for improvement of As2 O3 -mediated chemotherapy. In this study, we have identified a series of protective effects of resveratrol against As2 O3 -induced oxidative damage in normal human bronchial epithelial (HBE) cells. We showed that treatment of HBE cells with resveratrol significantly reduced cellular levels of DNA damage, chromosomal breakage, and apoptosis induced by As2 O3 . The effect of resveratrol against DNA damage was associated with a decreased level of reactive oxygen species and lipid peroxidation in cells treated by As2 O3 , suggesting that resveratrol protects against As2 O3 toxicity via a cellular anti-oxidative stress pathway. Further analysis of the roles of resveratrol demonstrated that it modulated biosynthesis, recycling, and consumption of glutathione (GSH), thereby promoting GSH homeostasis in HBE cells treated by As2 O3 . This was further supported by results showing that resveratrol prevented an increase in the activities and levels of caspases, Fas, Fas-L, and cytochrome c proteins induced by As2 O3 . Our study indicates that resveratrol relieves As2 O3 -induced oxidative damage in normal human lung cells via maintenance of GSH homeostasis and suppression of apoptosis.
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Affiliation(s)
- Chengzhi Chen
- Department of Environmental Health, West China School of Public Health, Sichuan University, Chengdu, Sichuan, People's Republic of China
| | - Xuejun Jiang
- Department of Environmental Health, West China School of Public Health, Sichuan University, Chengdu, Sichuan, People's Republic of China
| | - Yanhao Lai
- Department of Environmental Health, West China School of Public Health, Sichuan University, Chengdu, Sichuan, People's Republic of China
- Department of Chemistry and Biochemistry, Florida International University, Miami, Florida, USA
| | - Yuan Liu
- Department of Chemistry and Biochemistry, Florida International University, Miami, Florida, USA
- Biomolecular Sciences Institute, Florida International University, Miami, Florida, USA
- Corresponding authors: Zunzhen Zhang, M.D., Ph.D., Department of Environmental Health, West China School of Public Health, Sichuan University, No. 16, Section 3, Renmin Nan Road, Chengdu 610041, People's Republic of China. ; ; Tel: +86 028 85501298; Fax: +86 028 85501295, Yuan Liu, M.D., Ph.D., Department of Chemistry and Biochemistry, Florida International University, 11200 SW 8 Street, Miami, Florida, 33199, USA. ; Tel: 305-348-3628
| | - Zunzhen Zhang
- Department of Environmental Health, West China School of Public Health, Sichuan University, Chengdu, Sichuan, People's Republic of China
- Corresponding authors: Zunzhen Zhang, M.D., Ph.D., Department of Environmental Health, West China School of Public Health, Sichuan University, No. 16, Section 3, Renmin Nan Road, Chengdu 610041, People's Republic of China. ; ; Tel: +86 028 85501298; Fax: +86 028 85501295, Yuan Liu, M.D., Ph.D., Department of Chemistry and Biochemistry, Florida International University, 11200 SW 8 Street, Miami, Florida, 33199, USA. ; Tel: 305-348-3628
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16
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Zebboudj A, Maroui MA, Dutrieux J, Touil-Boukoffa C, Bourouba M, Chelbi-Alix MK, Nisole S. Sodium arsenite induces apoptosis and Epstein-Barr virus reactivation in lymphoblastoid cells. Biochimie 2014; 107 Pt B:247-56. [PMID: 25241256 DOI: 10.1016/j.biochi.2014.09.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2014] [Accepted: 09/04/2014] [Indexed: 12/09/2022]
Abstract
Epstein-Barr virus (EBV) is associated with several malignancies, including carcinomas, such as nasopharyngeal carcinoma, and lymphomas, such as Burkitt's lymphoma and Hodgkin's lymphoma. The Latent Membrane Protein 1 (LMP1) is the major oncogene protein of EBV as its expression is responsible for the induction of cell transformation, immortalization and proliferation. Arsenic trioxide was shown to induce a cytotoxic effect on nasopharyngeal cancer cells associated with LMP1 down-regulation. However, the effect of arsenic on EBV-associated lymphoproliferative malignancies has been less studied. We investigated the effect of two different arsenical compounds, arsenic trioxide (As2O3) and sodium arsenite (NaAsO2) on the induction of cell death in P3HR1 cells, an Epstein-Barr virus-positive Burkitt lymphoma derived cell line. Both compounds inhibited cell growth and induced cell death. By flow-cytometry and Western blot analysis, we provide evidence that NaAsO2 induced caspase-dependent apoptosis whereas As2O3 triggered autophagic cell death. Furthermore, we show that NaAsO2 treatment led to a dramatic decrease of the expression level of LMP1 and the cellular protein PML. Importantly, this down-regulation was associated with a reactivation of EBV lytic cycle through the induction of immediate-early proteins Zta and Rta. These results are in agreement with a model in which LMP1 maintains EBV in a latent state by stabilizing PML expression. Altogether, our results suggest that NaAsO2 would represent a better therapeutic candidate than As2O3 in EBV-induced B lymphoma for its capacity to promote viral reactivation.
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Affiliation(s)
- Abderezak Zebboudj
- LBCM, FSB, Université des Sciences et de la Technologie Houari Boumediene (USTHB), BP 32, El Alia, Bab Ezzouar, 16111 Algiers, Algeria; INSERM UMR-S 1124, Université Paris Descartes, 45 rue des Saints-Pères, 75006 Paris, France
| | - Mohamed Ali Maroui
- INSERM UMR-S 1124, Université Paris Descartes, 45 rue des Saints-Pères, 75006 Paris, France
| | - Jacques Dutrieux
- INSERM UMR-S 1124, Université Paris Descartes, 45 rue des Saints-Pères, 75006 Paris, France
| | - Chafia Touil-Boukoffa
- LBCM, FSB, Université des Sciences et de la Technologie Houari Boumediene (USTHB), BP 32, El Alia, Bab Ezzouar, 16111 Algiers, Algeria
| | - Mehdi Bourouba
- LBCM, FSB, Université des Sciences et de la Technologie Houari Boumediene (USTHB), BP 32, El Alia, Bab Ezzouar, 16111 Algiers, Algeria
| | - Mounira K Chelbi-Alix
- INSERM UMR-S 1124, Université Paris Descartes, 45 rue des Saints-Pères, 75006 Paris, France
| | - Sébastien Nisole
- INSERM UMR-S 1124, Université Paris Descartes, 45 rue des Saints-Pères, 75006 Paris, France.
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17
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Wang S, Geng Z, Shi N, Li X, Wang Z. The functions of crucial cysteine residues in the arsenite methylation catalyzed by recombinant human arsenic (III) methyltransferase. PLoS One 2014; 9:e110924. [PMID: 25349987 PMCID: PMC4211708 DOI: 10.1371/journal.pone.0110924] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2014] [Accepted: 09/23/2014] [Indexed: 11/18/2022] Open
Abstract
Arsenic (III) methyltransferase (AS3MT) is a cysteine (Cys)-rich enzyme that catalyzes the biomethylation of arsenic. To investigate how these crucial Cys residues promote catalysis, we used matrix-assisted laser desorption ionization-time of flight-mass spectrometry (MALDI-TOF-MS) to analyze Cys residues in recombinant human arsenic (III) methyltransferase (hAS3MT). We detected two disulfide bonds, Cys250-Cys32 and Cys368-Cys369, in hAS3MT. The Cys250-Cys32 disulfide bond was reduced by glutathione (GSH) or other disulfide bond reductants before the enzymatic methylation of arsenite (iAs3+). In addition to exposing residues around the active sites, cleavage of the Cys250-Cys32 pair modulated the conformation of hAS3MT. This adjustment may stabilize the binding of S-Adenosyl-L-methionine (AdoMet) and favor iAs3+ binding to hAS3MT. Additionally, we observed the intermediate of Cys250-S-adenosylhomocysteine (AdoHcy), suggesting that Cys250 is involved in the transmethylation. In recovery experiments, we confirmed that trivalent arsenicals were substrates for hAS3MT, methylation of arsenic occurred on the enzyme, and an intramolecular disulfide bond might be formed after iAs3+ was methylated to dimethylarsinous acid (DMA3+). In this work, we clarified both the functional roles of GSH and the crucial Cys residues in iAs3+ methylation catalyzed by hAS3MT.
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Affiliation(s)
- Shuping Wang
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, Jiangsu, PR China
| | - Zhirong Geng
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, Jiangsu, PR China
| | - Nan Shi
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, Jiangsu, PR China
| | - Xiangli Li
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, Jiangsu, PR China
| | - Zhilin Wang
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, Jiangsu, PR China
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18
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Lohar S, Pal S, Sen B, Mukherjee M, Banerjee S, Chattopadhyay P. Selective and Sensitive Turn-on Chemosensor for Arsenite Ion at the ppb Level in Aqueous Media Applicable in Cell Staining. Anal Chem 2014; 86:11357-61. [PMID: 25312655 DOI: 10.1021/ac503255f] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Somenath Lohar
- Department
of Chemistry, The University of Burdwan, Burdwan, West Bengal 713104, India
| | - Siddhartha Pal
- Department
of Chemistry, The University of Burdwan, Burdwan, West Bengal 713104, India
| | - Buddhadeb Sen
- Department
of Chemistry, The University of Burdwan, Burdwan, West Bengal 713104, India
| | - Manjira Mukherjee
- Department
of Chemistry, The University of Burdwan, Burdwan, West Bengal 713104, India
| | - Samya Banerjee
- Department
of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore, Karnataka 560012, India
| | - Pabitra Chattopadhyay
- Department
of Chemistry, The University of Burdwan, Burdwan, West Bengal 713104, India
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19
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Khaleghian A, Ghaffari SH, Ahmadian S, Alimoghaddam K, Ghavamzadeh A. Metabolism of arsenic trioxide in acute promyelocytic leukemia cells. J Cell Biochem 2014; 115:1729-39. [PMID: 24819152 DOI: 10.1002/jcb.24838] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2014] [Accepted: 05/08/2014] [Indexed: 11/10/2022]
Abstract
Arsenic trioxide (As2O3) effectively induces complete clinical and molecular remissions in acute promyelocytic leukemia (APL) patients and triggers apoptosis in APL cells. The effect induced by As2O3 is also associated with extensive genomic-wide epigenetic changes with large-scale alterations in DNA methylation. We investigated the As2O3 metabolism in association with factors involved in the production of its methylated metabolites in APL-derived cell line, NB4. We used high performance liquid chromatography (HPLC) technique to detect As2O3 metabolites in NB4 cells. The effects of As2O3 on glutathione level, S-Adenosylmethionine (SAM) and S-adenosylhomocysteine (SAH) levels were investigated. Also, we studied the expression levels of arsenic methyltransferase (AS3MT) and DNA methyltransferases (DNMT1, DNMT3a, and DNMT3b) by real-time PCR. Our results show that after As2O3 entry into the cell, it was converted into methylated metabolites, mono-methylarsenic (MMA) and dimethylarsenic (DMA). The glutathione (GSH) production was increased in parallel with the methylated metabolites formations. As2O3 treatment inhibited DNMTs (DNMT1, DNMT3a, and DNMT3b) in dose- and time-dependent manners. The SAH levels in As2O3-treated cells were increased; however, the SAM level was not affected. The present study shows that APL cell is capable of metabolizing As2O3. The continuous formation of intracellular methylated metabolites, the inhibition of DNMTs expression levels and the increase of SAH level by As2O3 biotransformation would probably affect the DNMTs-methylated DNA methylation in a manner related to the extent of DNA hypomethylation. Production of intracellular methylated metabolites and epigenetic changes of DNA methylation during As2O3 metabolism may contribute to the therapeutic effect of As2O3 in APL.
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Affiliation(s)
- Ali Khaleghian
- Institute of Biochemistry and Biophysics (IBB), University of Tehran, P.O. Box 13145-1384, Tehran, Iran; Hematology, Oncology and Stem Cell Transplantation Research Center, Shariati Hospital, Tehran University of Medical Sciences, Tehran, Iran
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Inhibitory mechanism of dimercaptopropanesulfonic acid (DMPS) in the cellular biomethylation of arsenic. Biochimie 2014; 106:167-74. [PMID: 25194983 DOI: 10.1016/j.biochi.2014.08.017] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2014] [Accepted: 08/27/2014] [Indexed: 11/22/2022]
Abstract
Dimercaptopropanesulfonic acid (DMPS) has been approved for the treatment of arsenic poisoning through promoting arsenic excretion and modulating arsenic species. To clarify how DMPS regulates the excretion of arsenic species, we investigated the effects of DMPS on the biomethylation of arsenite (As(3+)) in HepG2 cells. In the experiments, we found that DMPS at low concentrations dramatically decreased the content of arsenic in HepG2 cells and inhibited the cellular methylation of As(3+). Three aspects, the expression of human arsenic (III) methyltransferase (hAS3MT), the accumulation of cellular reactive oxygen species (ROS) and the in vitro enzymatic methylation of arsenic, were considered to explain the reasons for the inhibition of DMPS in arsenic metabolism. The results suggested that DMPS competitively coordinated with As(3+) and monomethylarsonous acid (MMA(3+)) to inhibit the up-regulation of arsenic on the expression of hAS3MT and block arsenic involving in the enzymatic methylation. Moreover, DMPS eliminated arsenic-induced accumulation of ROS, which might contribute to the antidotal effects of DMPS on arsenic posing.
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Critical role of cellular glutathione homeostasis for trivalent inorganic arsenite-induced oxidative damage in human bronchial epithelial cells. MUTATION RESEARCH-GENETIC TOXICOLOGY AND ENVIRONMENTAL MUTAGENESIS 2014; 770:35-45. [DOI: 10.1016/j.mrgentox.2014.04.016] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2013] [Revised: 04/28/2014] [Accepted: 04/29/2014] [Indexed: 12/19/2022]
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Bustaffa E, Stoccoro A, Bianchi F, Migliore L. Genotoxic and epigenetic mechanisms in arsenic carcinogenicity. Arch Toxicol 2014; 88:1043-67. [PMID: 24691704 DOI: 10.1007/s00204-014-1233-7] [Citation(s) in RCA: 92] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2013] [Accepted: 03/18/2014] [Indexed: 02/06/2023]
Abstract
Arsenic is a human carcinogen with weak mutagenic properties that induces tumors through mechanisms not yet completely understood. People worldwide are exposed to arsenic-contaminated drinking water, and epidemiological studies showed a high percentage of lung, bladder, liver, and kidney cancer in these populations. Several mechanisms by which arsenical compounds induce tumorigenesis were proposed including genotoxic damage and chromosomal abnormalities. Over the past decade, a growing body of evidence indicated that epigenetic modifications have a role in arsenic-inducing adverse effects on human health. The main epigenetic mechanisms are DNA methylation in gene promoter regions that regulate gene expression, histone tail modifications that regulate the accessibility of transcriptional machinery to genes, and microRNA activity (noncoding RNA able to modulate mRNA translation). The "double capacity" of arsenic to induce mutations and epimutations could be the main cause of arsenic-induced carcinogenesis. The aim of this review is to better clarify the mechanisms of the initiation and/or the promotion of arsenic-induced carcinogenesis in order to understand the best way to perform an early diagnosis and a prompt prevention that is the key point for protecting arsenic-exposed population. Studies on arsenic-exposed population should be designed in order to examine more comprehensively the presence and consequences of these genetic/epigenetic alterations.
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Affiliation(s)
- Elisa Bustaffa
- Unit of Environmental Epidemiology and Diseases Registries, Institute of Clinical Physiology, National Council of Research, Via Moruzzi 1, 56123, Pisa, Italy
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Chen C, Jiang X, Ren Y, Zhang Z. Arsenic trioxide co-exposure potentiates benzo(a)pyrene genotoxicity by enhancing the oxidative stress in human lung adenocarcinoma cell. Biol Trace Elem Res 2013; 156:338-49. [PMID: 24061964 DOI: 10.1007/s12011-013-9819-0] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/02/2013] [Accepted: 09/09/2013] [Indexed: 10/26/2022]
Abstract
Although both arsenic trioxide (As2O3) and benzo(a)pyrene (BaP) are well-established human carcinogens, the interaction between As2O3 and BaP is synergistic or antagonistic remains controversial in terms of the existing studies. In addition, the mechanisms responsible for the combined effects are still unclear. In this study, we examined the potential interactive effects between As2O3 (1, 5, and 10 μM) and BaP (5, 10, and 20 μM) in cultured A549 cells by treating with BaP and As2O3 alone or in combination at various concentrations for 24 h. The single and combined effects of As2O3 and BaP on the cytotoxicity, DNA/chromosomal damage, and oxidative stress were examined by using tetrazolium (3-(4,5-dimethyithiazol-2-yl)-2,5-diphenyl-tetrazolium bromide) dye colorimetric assay, colony formation assay, fluorescence probe, chemical colorimetry, comet assay as well as micronucleus test. Our results showed that As2O3 synergistically enhanced the cytotoxicity, genotoxicity, and level of oxidative stress induced by BaP at various tested concentrations. Also, our experimental results showed that intracellular glutathione (GSH) contents were increased by various doses of BaP, but single or cotreatment with As2O3 significantly decreased the GSH level in the cells at all tested concentrations. Taken together, our results suggest that As2O3 may exert its synergistic cyto- and genotoxic effects with BaP mainly via elevated intracellular reactive oxygen species and reduced GSH contents and superoxide dismutase activities, thus promoting high level of oxidative stress, which may be a pivotal mechanism underlying As2O3 cocarcinogenic action.
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Affiliation(s)
- Chengzhi Chen
- Department of Environmental Health, West China School of Public Health, Sichuan University, No. 16, Section 3, Renmin Nan Road, Chengdu, 610041, People's Republic of China
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Teixeira MZ. Rebound effect of modern drugs: serious adverse event unknown by health professionals. Rev Assoc Med Bras (1992) 2013; 59:629-38. [PMID: 24211013 DOI: 10.1016/j.ramb.2013.05.003] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2012] [Revised: 02/24/2013] [Accepted: 05/21/2013] [Indexed: 12/13/2022] Open
Abstract
OBJECTIVE Supported in the Hippocratic aphorism primum non nocere, the bioethical principle of non-maleficence pray that the medical act cause the least damage or injury to the health of the patient, leaving it to the doctor to assess the risks of a particular therapy through knowledge of possible adverse events of drugs. Among these, the rebound effect represents a common side effect to numerous classes of modern drugs, may cause serious and fatal disorders in patients. This review aims to clarify the health professionals on clinical and epidemiological aspects of rebound phenomenon. METHODS A qualitative, exploratory and bibliographic review was held in the PubMed database using the keywords 'rebound', 'withdrawal', 'paradoxical', 'acetylsalicylic acid', 'anti-inflammatory', 'bronchodilator', 'antidepressant', 'statin', 'proton pump inhibitor' and 'bisphosphonate'. RESULTS The rebound effect occurs after discontinuation of numerous classes of drugs that act contrary to the disease disorders, exacerbating them at levels above those prior to treatment. Regardless of the disease, the drug and duration of treatment, the phenomenon manifests itself in a small proportion of susceptible individuals. However, it may cause serious and fatal adverse events should be considered a public health problem in view of the enormous consumption of drugs by population. CONCLUSION Bringing together a growing and unquestionable body of evidence, the physician needs to have knowledge of the consequences of the rebound effect and how to minimize it, increasing safety in the management of modern drugs. On the other hand, this rebound can be used in a curative way, broadening the spectrum of the modern therapeutics.
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Affiliation(s)
- Marcus Zulian Teixeira
- Disciplina Fundamentos da Homeopatia, Faculdade de Medicina, Universidade de São Paulo, São Paulo, SP, Brasil.
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Jiang X, Chen C, Zhao W, Zhang Z. Sodium arsenite and arsenic trioxide differently affect the oxidative stress, genotoxicity and apoptosis in A549 cells: an implication for the paradoxical mechanism. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2013; 36:891-902. [PMID: 24004876 DOI: 10.1016/j.etap.2013.08.002] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2013] [Revised: 08/02/2013] [Accepted: 08/04/2013] [Indexed: 05/12/2023]
Abstract
Although arsenic toxicity greatly depends on its chemical forms, few studies have taken into account the paradoxical phenomenon which is manifested by that sodium arsenite (NaAsO₂) acts as a potent carcinogen but arsenic trioxide (As₂O₃) serves as an effective therapeutic agent. In this study, we compared the in vitro effects of NaAsO₂ and As₂O₃ on cell viability, colony formation, cell cycle progression, apoptosis, genotoxicity and oxidative stress in human lung adenocarcinoma A549 cells. Our results demonstrated that both NaAsO₂ and As₂O₃ caused oxidative stress, genotoxicity, cytotoxicity, cell cycle arrest as well as apoptosis, while As₂O₃ induced higher production of reactive oxygen species (ROS) with a more remarkable decrease in superoxide dismutase (SOD) activities and intracellular levels of glutathione (GSH) than NaAsO₂. Moreover, the degree of DNA damage, chromosomal breakage, cell cycle arrest and apoptosis in As₂O₃-treated cells were more severe than those in NaAsO₂-treated cells. These findings suggest that differential effects and mechanisms of NaAsO₂ and As₂O₃ may responsible for the paradoxical effects of arsenic on the carcinogenesis and anticancer function.
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Affiliation(s)
- Xuejun Jiang
- Department of Environmental Health, West China School of Public Health, Sichuan University, Chengdu 610041, PR China
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Schmeisser S, Schmeisser K, Weimer S, Groth M, Priebe S, Fazius E, Kuhlow D, Pick D, Einax JW, Guthke R, Platzer M, Zarse K, Ristow M. Mitochondrial hormesis links low-dose arsenite exposure to lifespan extension. Aging Cell 2013; 12:508-17. [PMID: 23534459 PMCID: PMC3709120 DOI: 10.1111/acel.12076] [Citation(s) in RCA: 108] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/16/2013] [Indexed: 11/30/2022] Open
Abstract
Arsenite is one of the most toxic chemical substances known and is assumed to exert detrimental effects on viability even at lowest concentrations. By contrast and unlike higher concentrations, we here find that exposure to low-dose arsenite promotes growth of cultured mammalian cells. In the nematode C. elegans, low-dose arsenite promotes resistance against thermal and chemical stressors and extends lifespan of this metazoan, whereas higher concentrations reduce longevity. While arsenite causes a transient increase in reactive oxygen species (ROS) levels in C. elegans, co-exposure to ROS scavengers prevents the lifespan-extending capabilities of arsenite, indicating that transiently increased ROS levels act as transducers of arsenite effects on lifespan, a process known as mitohormesis. This requires two transcription factors, namely DAF-16 and SKN-1, which employ the metallothionein MTL-2 as well as the mitochondrial transporter TIN-9.1 to extend lifespan. Taken together, low-dose arsenite extends lifespan, providing evidence for nonlinear dose-response characteristics of toxin-mediated stress resistance and longevity in a multicellular organism.
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Affiliation(s)
- Sebastian Schmeisser
- Department of Human Nutrition Institute of Nutrition University of Jena D‐07743Jena Germany
- Leibniz Graduate School of Aging Leibniz Institute for Age Research Fritz‐Lipmann‐Institute D‐07745Jena Germany
| | - Kathrin Schmeisser
- Department of Human Nutrition Institute of Nutrition University of Jena D‐07743Jena Germany
| | - Sandra Weimer
- Department of Clinical Nutrition German Institute of Human Nutrition Potsdam‐Rehbrücke D‐14558Nuthetal Germany
- Energy Metabolism Laboratory Swiss Federal Institute of Technology (ETH) Zurich Schwerzenbach/Zürich CH 8603Switzerland
| | - Marco Groth
- Genome Analysis Group Leibniz Institute for Age Research Fritz‐Lipmann‐Institute D‐07745Jena Germany
| | - Steffen Priebe
- Systems Biology and Bioinformatics Group Leibniz Institute for Natural Product Research and Infection Biology Hans‐Knöll‐Institute D‐07745 Jena Germany
| | - Eugen Fazius
- Systems Biology and Bioinformatics Group Leibniz Institute for Natural Product Research and Infection Biology Hans‐Knöll‐Institute D‐07745 Jena Germany
| | - Doreen Kuhlow
- Department of Human Nutrition Institute of Nutrition University of Jena D‐07743Jena Germany
- Department of Clinical Nutrition German Institute of Human Nutrition Potsdam‐Rehbrücke D‐14558Nuthetal Germany
| | - Denis Pick
- Department of Environmental Analysis Institute of Inorganic and Analytical Chemistry University of Jena D‐07743Jena Germany
| | - Jürgen W. Einax
- Department of Environmental Analysis Institute of Inorganic and Analytical Chemistry University of Jena D‐07743Jena Germany
| | - Reinhard Guthke
- Systems Biology and Bioinformatics Group Leibniz Institute for Natural Product Research and Infection Biology Hans‐Knöll‐Institute D‐07745 Jena Germany
| | - Matthias Platzer
- Genome Analysis Group Leibniz Institute for Age Research Fritz‐Lipmann‐Institute D‐07745Jena Germany
| | - Kim Zarse
- Department of Human Nutrition Institute of Nutrition University of Jena D‐07743Jena Germany
- Energy Metabolism Laboratory Swiss Federal Institute of Technology (ETH) Zurich Schwerzenbach/Zürich CH 8603Switzerland
| | - Michael Ristow
- Department of Human Nutrition Institute of Nutrition University of Jena D‐07743Jena Germany
- Department of Clinical Nutrition German Institute of Human Nutrition Potsdam‐Rehbrücke D‐14558Nuthetal Germany
- Energy Metabolism Laboratory Swiss Federal Institute of Technology (ETH) Zurich Schwerzenbach/Zürich CH 8603Switzerland
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Chen C, Jiang X, Zhao W, Zhang Z. Dual role of resveratrol in modulation of genotoxicity induced by sodium arsenite via oxidative stress and apoptosis. Food Chem Toxicol 2013; 59:8-17. [PMID: 23727334 DOI: 10.1016/j.fct.2013.05.030] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2013] [Revised: 05/12/2013] [Accepted: 05/15/2013] [Indexed: 12/14/2022]
Abstract
The potential benefits of resveratrol as an anticancer (proapoptosis) and antioxidant (pro-survival) compound have been studied extensively. However, the role of resveratrol in modulation of the toxicity induced by sodium arsenite (NaAsO₂) is still unclear. In the present study, we examined the effects of resveratrol on NaAsO₂-induced cytotoxicity, DNA and chromosomal damage, cell cycle progression, apoptosis and oxidative stress in human lung adenocarcinoma epithelial (A549) cell line at concentrations from 1 to 20 μM after 24h exposure. Our results revealed that at 1 and 5 μM, resveratrol was found to exert benefit effects, promoting cell viability and proliferation over 24h NaAsO₂ exposure, whereas, resveratrol was showed to inhibit cell survival under the same condition at 20 μM. Corresponding to the opposing effect of resveratrol at low vs. high concentrations, DNA and chromosomal damage, cell apoptotic rate and level of oxidative stress were also alleviated by lower concentrations (1, 5 μM) of resveratrol, but exacerbated by higher concentration (20 μM) resveratrol. Our study implicates that resveratrol is the most beneficial to cells at 1 and 5 μM and caution should be taken in applying resveratrol as an anticancer therapeutic agent or nutraceutical supplement due to its concentration dependent effect.
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Affiliation(s)
- Chengzhi Chen
- Department of Environmental Health, School of Public Health, Sichuan University, Chengdu 610041, China
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28
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Anwar-Mohamed A, Abdelhamid G, Amara IEA, El-Kadi AOS. Differential modulation of cytochrome P450 1a1 by arsenite in vivo and in vitro in C57BL/6 mice. Free Radic Biol Med 2013; 58:52-63. [PMID: 23369756 DOI: 10.1016/j.freeradbiomed.2013.01.012] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/12/2012] [Revised: 01/14/2013] [Accepted: 01/22/2013] [Indexed: 10/27/2022]
Abstract
Heavy metals, typified by arsenite (As(III)), have been implicated in altering the carcinogenicity of aryl hydrocarbon receptor (AhR) ligands, typified by 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD), by modulating the induction of the Cyp1a1 enzyme, but the mechanism remains unresolved. In this study, the effects of As(III) on Cyp1a1 expression and activity were investigated in C57BL/6 mouse livers and isolated hepatocytes. For this purpose, C57BL/6 mice were injected intraperitoneally with As(III) (12.5 mg/kg) in the absence and presence of TCDD (15 μg/kg) for 6 and 24 h. Furthermore, isolated hepatocytes from C57BL/6 mice were treated with As(III) (1, 5, and 10 μM) in the absence and presence of TCDD (1 nM) for 3, 6, 12, and 24 h. At the in vivo level, As(III) decreased the TCDD-mediated induction of Cyp1a1 mRNA at 6h while potentiating its mRNA, protein, and catalytic activity levels at 24 h. At the in vitro level, As(III) decreased the TCDD-mediated induction of Cyp1a1 mRNA in a concentration- and time-dependent manner. Moreover, As(III) decreased the TCDD-mediated induction of Cyp1a1 protein and catalytic activity levels at 24 h. Interestingly, As(III) increased the serum hemoglobin (Hb) levels in animals treated for 24 h. Upon treatment of isolated hepatocytes with Hb alone, there was an increase in the nuclear accumulation of AhR and AhR-dependent luciferase activity. Furthermore, Hb potentiated the TCDD-induced AhR-dependent luciferase activity. Importantly, when isolated hepatocytes were treated for 5h with As(III) in the presence of TCDD and the medium was then replaced with new medium containing Hb, there was potentiation of the TCDD-mediated effect. Taken together, these results demonstrate for the first time that there is a differential modulation of the TCDD-mediated induction of Cyp1a1 by As(III) in C57BL/6 mouse livers and isolated hepatocytes. Thus, this study implicates Hb as an in vivo-specific modulator.
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Affiliation(s)
- Anwar Anwar-Mohamed
- Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, AB, Canada T6G 2E1
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29
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Kritharis A, Bradley TP, Budman DR. The evolving use of arsenic in pharmacotherapy of malignant disease. Ann Hematol 2013; 92:719-30. [DOI: 10.1007/s00277-013-1707-3] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2012] [Accepted: 02/11/2013] [Indexed: 12/01/2022]
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30
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Anwar-Mohamed A, El-Sherbeni AA, Kim SH, Althurwi HN, Zordoky BNM, El-Kadi AOS. Acute arsenic toxicity alters cytochrome P450 and soluble epoxide hydrolase and their associated arachidonic acid metabolism in C57Bl/6 mouse heart. Xenobiotica 2012; 42:1235-47. [PMID: 22680237 DOI: 10.3109/00498254.2012.693971] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Acute arsenic (As(III)) exposure has been reported to cause cardiac toxicity, however this toxicity was never linked to the disturbance in cytochrome P450 (P450)-mediated arachidonic acid metabolism. Therefore, we investigated the effect of acute As(III) toxicity on the expression of P450 and soluble epoxide hydrolase (sEH) and their associated arachidonic acid metabolism in mice hearts. As(III) toxicity was induced by a single intraperitoneal injection of 12.5 mg/kg of As(III). Our results showed that As(III) treatment caused a significant induction of the cardiac hypertrophic markers in addition to Cyp1b1, Cyp2b, Cyp2c, Cyp4f, and sEH gene expression in mice hearts. Furthermore, As(III) increased sEH protein expression and activity in hearts with a consequent decrease in 11,12-, and 14,15-epoxyeicosatrienoic acids (EETs) formation. Whereas the formation of 8,9-, 11,12-, 14,15-dihydroxyeicosatrienoic acids (DHETs) was significantly increased. As(III) also increased sEH mRNA and protein expression levels in addition to the hypertrophic markers which was reversed by knockdown of sEH in H9c2 cells. In conclusion, acute As(III) toxicity alters the expression of several P450s and sEH enzymes with a consequent decrease in the cardioprotective EETs which may represent a novel mechanism by which As(III) causes progressive cardiotoxicity. Furthermore, inhibiting sEH might represent a novel therapeutic approach to prevent As(III)-induced hypertrophy.
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Affiliation(s)
- Anwar Anwar-Mohamed
- Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, Alberta, Canada
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31
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Abstract
A paradoxical drug reaction constitutes an outcome that is opposite from the outcome that would be expected from the drug's known actions. There are three types: 1. A paradoxical response in a condition for which the drug is being explicitly prescribed. 2. Paradoxical precipitation of a condition for which the drug is indicated, when the drug is being used for an alternative indication. 3. Effects that are paradoxical in relation to an aspect of the pharmacology of the drug but unrelated to the usual indication. In bidirectional drug reactions, a drug may produce opposite effects, either in the same or different individuals, the effects usually being different from the expected beneficial effect. Paradoxical and bidirectional drug effects can sometimes be harnessed for benefit; some may be adverse. Such reactions arise in a wide variety of drug classes. Some are common; others are reported in single case reports. Paradoxical effects are often adverse, since they are opposite the direction of the expected effect. They may complicate the assessment of adverse drug reactions, pharmacovigilance, and clinical management. Bidirectional effects may be clinically useful or adverse. From a clinical toxicological perspective, altered pharmacokinetics or pharmacodynamics in overdose may exacerbate paradoxical and bidirectional effects. Certain antidotes have paradoxical attributes, complicating management. Apparent clinical paradoxical or bidirectional effects and reactions ensue when conflicts arise at different levels in self-regulating biological systems, as complexity increases from subcellular components, such as receptors, to cells, tissues, organs, and the whole individual. These may be incompletely understood. Mechanisms of such effects include different actions at the same receptor, owing to changes with time and downstream effects; stereochemical effects; multiple receptor targets with or without associated temporal effects; antibody-mediated reactions; three-dimensional architectural constraints; pharmacokinetic competing compartment effects; disruption and non-linear effects in oscillating systems, systemic overcompensation, and other higher-level feedback mechanisms and feedback response loops at multiple levels. Here we review and provide a compendium of multiple class effects and individual reactions, relevant mechanisms, and specific clinical toxicological considerations of antibiotics, immune modulators, antineoplastic drugs, and cardiovascular, CNS, dermal, endocrine, musculoskeletal, gastrointestinal, haematological, respiratory, and psychotropic agents.
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Affiliation(s)
- Silas W Smith
- Department of Emergency Medicine, New York University School of Medicine, New York, NY 10016, USA.
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32
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Anwar-Mohamed A, Abdelhamid G, Amara IEA, El-Kadi AOS. Differential modulation of aryl hydrocarbon receptor regulated enzymes by arsenite in the kidney, lung, and heart of C57BL/6 mice. Arch Toxicol 2012; 86:897-910. [DOI: 10.1007/s00204-012-0855-x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2012] [Accepted: 04/10/2012] [Indexed: 10/28/2022]
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33
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Muenyi CS, Pinhas AR, Fan TW, Brock GN, Helm CW, States JC. Sodium arsenite ± hyperthermia sensitizes p53-expressing human ovarian cancer cells to cisplatin by modulating platinum-DNA damage responses. Toxicol Sci 2012; 127:139-49. [PMID: 22331493 DOI: 10.1093/toxsci/kfs085] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Epithelial ovarian cancer (EOC) is the leading cause of gynecological cancer death in the United States. Cisplatin is a DNA damaging agent initially effective against EOC but limited by resistance. P53 plays a critical role in cellular response to DNA damage and has been implicated in EOC response to platinum chemotherapy. In this study, we examined the role of p53 status in EOC response to a novel combination of cisplatin, sodium arsenite, and hyperthermia. Human EOC cells were treated with cisplatin ± 20μM sodium arsenite at 37°C or 39°C for 1 h. Sodium arsenite ± hyperthermia sensitized wild-type p53-expressing (A2780, A2780/CP70, OVCA 420, OVCA 429, and OVCA 433) EOC cells to cisplatin. Hyperthermia sensitized p53-null SKOV-3 and p53-mutant (OVCA 432 and OVCAR-3) cells to cisplatin. P53 small interfering RNA (siRNA) transfection abrogated sodium arsenite sensitization effect. XPC, a critical DNA damage recognition protein in global genome repair pathway, was induced by cisplatin only in wild-type p53-expressing cells. Cotreatment with sodium arsenite ± hyperthermia attenuated cisplatin-induced XPC in wild-type p53-expressing cells. XPC siRNA transfection sensitized wild-type p53-expressing cells to cisplatin, suggesting that sodium arsenite ± hyperthermia attenuation of XPC is a mechanism by which wild-type p53-expressing cells are sensitized to cisplatin. Hyperthermia ± sodium arsenite enhanced cellular and DNA accumulation of platinum in wild-type p53-expressing cells. Only hyperthermia enhanced platinum accumulation in p53-null cells. In conclusion, sodium arsenite ± hyperthermia sensitizes wild-type p53-expressing EOC cells to cisplatin by suppressing DNA repair protein XPC and increasing cellular and DNA platinum accumulation.
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Affiliation(s)
- Clarisse S Muenyi
- Department of Pharmacology and Toxicology, University of Louisville, Louisville, Kentucky 40292, USA
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34
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Molin M, Ulven SM, Dahl L, Telle-Hansen VH, Holck M, Skjegstad G, Ledsaak O, Sloth JJ, Goessler W, Oshaug A, Alexander J, Fliegel D, Ydersbond TA, Meltzer HM. Humans seem to produce arsenobetaine and dimethylarsinate after a bolus dose of seafood. ENVIRONMENTAL RESEARCH 2012; 112:28-39. [PMID: 22137101 DOI: 10.1016/j.envres.2011.11.007] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2011] [Revised: 09/22/2011] [Accepted: 11/11/2011] [Indexed: 05/04/2023]
Abstract
Seafood is the predominant food source of several organoarsenic compounds. Some seafood species, like crustaceans and seaweed, also contain inorganic arsenic (iAs), a well-known toxicant. It is unclear whether human biotransformation of ingested organoarsenicals from seafood result in formation of arsenicals of health concern. The present controlled dietary study examined the urinary excretion of arsenic compounds (total arsenic (tAs), iAs, AB (arsenobetaine), dimethylarsinate (DMA) and methylarsonate (MA)) following ingestion of a single test meal of seafood (cod, 780 μg tAs, farmed salmon, 290 μg tAs or blue mussel, 690 μg tAs or potato (control, 110 μg tAs)) in 38 volunteers. The amount of ingested tAs excreted via the urine within 0-72 h varied significantly among the groups: Cod, 74% (52-92%), salmon 56% (46-82%), blue mussel 49% (37-78%), control 45% (30-60%). The estimated total urinary excretion of AB was higher than the amount of ingested AB in the blue mussel group (112%) and also ingestion of cod seemed to result in more AB, indicating possible endogenous formation of AB from other organoarsenicals. Excretion of iAs was lower than ingested (13-22% of the ingested iAs was excreted in the different groups). Although the ingested amount of iAs+DMA+MA was low for all seafood groups (1.2-4.5% of tAs ingested), the urinary DMA excretion was high in the blue mussel and salmon groups, counting for 25% and 11% of the excreted tAs respectively. In conclusion our data indicate a possible formation of AB as a result of biotransformation of other organic arsenicals. The considerable amount of DMA excreted is probably not only due to methylation of ingested iAs, but due to biotransformation of organoarsenicals making it an inappropriate biomarker of iAs exposure in populations with a high seafood intake.
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Affiliation(s)
- M Molin
- Department of Health, Nutrition and Management, Faculty of Health Sciences, Oslo and Akershus University College of Applied Sciences, P.O. 4, St. Olavs Plass, NO-0130 Oslo, Norway.
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Alteration in miRNA gene expression pattern in acute promyelocytic leukemia cell induced by arsenic trioxide: a possible mechanism to explain arsenic multi-target action. Tumour Biol 2011; 33:157-72. [PMID: 22072212 DOI: 10.1007/s13277-011-0259-1] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2011] [Accepted: 10/25/2011] [Indexed: 10/15/2022] Open
Abstract
MicroRNAs (miRNAs) are involved in cancer pathogenesis, apoptosis, and cell growth, and these miRNAs are thought to be functional as oncogenes and/or tumor suppressors in the gene regulatory networks. We studied the potential contribution of miRNAs in acute promyelocytic leukemia (APL) cell NB4 during the apoptosis induction by arsenic trioxide (ATO). The apoptotic effects of ATO on the NB4 cell line at a pharmacological dose (2 μM) was verified using cell growth and viability assays, MTT assay, BrdU cell proliferation assay, flow cytometric analysis, and caspase-3 activity assay. miRNAs from untreated and 2 μM ATO-treated NB4 cell line were extracted, purified, and converted to complementary DNAs. Differential expressions of 88 cancer-related miRNAs were analyzed by real-time reverse transcription PCR using miRNA PCR cancer-array system. After normalizing to the average Ct value of three housekeeping genes in the array (U6, SNORD47, and SNORD48), the fold change of miRNAs was calculated in the ATO-treated cells as compared to untreated. Among the 88 cancer-focused miRNAs, 51 miRNAs were found to be differentially expressed more than 2-fold after ATO treatment. Of these, 48 miRNAs were upregulated up to 21.65-fold changes, while three miRNAs were downregulated up to 5.19-fold changes. By screening the literature, a majority of these upregulated miRNAs were found to have tumor and/or metastatic suppressors' functions associated with cell cycle arrest and apoptosis, as well as inhibition of angiogenesis, invasion, and metastasis. Our results demonstrate that ATO, at the relevant concentration, modulate a substantial number of cancer-related miRNAs in APL cell line; most of these are known to function as a tumor and/or metastatic suppressors and have confirmed targets involved in cell cycle arrest and apoptosis. The results of this study support the hypothesis that miRNAs may play a mediatory role in eliciting the multi-target and pleiotropic action of ATO.
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Raja WK, Satti J, Liu G, Castracane J. Dose Response of MTLn3 Cells to Serial Dilutions of Arsenic Trioxide and Ionizing Radiation. Dose Response 2011; 11:29-40. [PMID: 23550222 DOI: 10.2203/dose-response.11-025.raja] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
MTLn3 cells derived from mouse mammary epithelium are known to be highly malignant and are resistant to both radio- and chemo-therapy. We exposed MTLn3 cells to various doses of inorganic Arsenic trioxide (As2O3) in combination with ionizing radiation. Cells were treated with a series of As2O3 concentrations ranging from 20 μM to 1.22 nM for 8 hour, 24 hour and 48 hour periods. Post-treated cell proliferation was quantified by measuring mitochondrial activity and DNA analysis. Cells exposed to radiation and As2O3 at concentration greater than 1.25 μM showed apoptosis and radiations alone treated cells were statistically not different from the control. Hormesis was observed for As2O3 concentrations in the range of 0.078 μM to 0.625 μM while the combined chemo and radiation treatments of the cells did not affect the hormetic effect. We have demonstrated that As2O3 (in the presence and absence of ionizing radiation) in specific low concentrations induced apoptosis in the otherwise chemoresistant cancer cells. This low concentration-mediated cell death is immediately followed by a surge in cell survival. Low dosing dosimetry is highly desirable in metronomic therapy however, it has a narrow window since necrosis, hormesis, apoptosis and other dose-dependent biological processes take place in this region. Further quantifiable dosimetry is highly desired for routine clinical practice.
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Affiliation(s)
- Waseem Khan Raja
- Biomedical Engineering, Tufts University and College of Nanoscale Science and Engineering, University at Albany
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Demicheli C, Frézard F, Pereira FA, Santos DM, Mangrum JB, Farrell NP. Interaction of arsenite with a zinc finger CCHC peptide: evidence for formation of an As-Zn-peptide mixed complex. J Inorg Biochem 2011; 105:1753-8. [PMID: 22099473 DOI: 10.1016/j.jinorgbio.2011.09.023] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2011] [Revised: 09/12/2011] [Accepted: 09/14/2011] [Indexed: 11/26/2022]
Abstract
The interaction of arsenite with a Cys(3)His (CCHC) zinc finger model (34-51) HIV-1 nucleocapsid protein p7 (NCp7) peptide in the absence and presence of Zn(II) was studied using fluorescence spectroscopy, CD (circular dichroism) and ESI-MS (Electrospray Ionization Mass Spectrometry). We found that arsenic forms different complexes with the free peptide and the zinc finger peptide. In the former case the peptide conformation differed greatly from that of the zinc finger, whereas in the second case a mixed As-Zn-peptide complex was formed with partial preservation of zinc finger conformation. An apparent stability constant was estimated for the mixed As-Zn-peptide complex (K=2083 M(-1) and 442 M(-1) at 25°C and pHs 6 and 7, respectively). Our study also shows that the interaction of arsenic with the CCHC motif is facilitated by glutathione (GSH), through formation of a GS-As-peptide conjugate.
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Affiliation(s)
- Cynthia Demicheli
- Departamento de Química, Instituto de Ciências Exatas, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Pampulha, Belo Horizonte, MG, Brazil.
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As2O3 oxidation by vitamin C: cell culture studies. Biometals 2011; 25:103-13. [DOI: 10.1007/s10534-011-9486-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2011] [Accepted: 07/31/2011] [Indexed: 11/25/2022]
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Arsenic trioxide inhibits HCCLM3 cells invasion through de novo ceramide synthesis and sphingomyelinase-induced ceramide production. Med Oncol 2011; 29:2251-60. [DOI: 10.1007/s12032-011-0023-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2011] [Accepted: 06/29/2011] [Indexed: 01/18/2023]
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Muenyi CS, States VA, Masters JH, Fan TW, Helm CW, States JC. Sodium arsenite and hyperthermia modulate cisplatin-DNA damage responses and enhance platinum accumulation in murine metastatic ovarian cancer xenograft after hyperthermic intraperitoneal chemotherapy (HIPEC). J Ovarian Res 2011; 4:9. [PMID: 21696631 PMCID: PMC3143084 DOI: 10.1186/1757-2215-4-9] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2011] [Accepted: 06/22/2011] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND Epithelial ovarian cancer (EOC) is the leading cause of gynecologic cancer death in the USA. Recurrence rates are high after front-line therapy and most patients eventually die from platinum (Pt) - resistant disease. Cisplatin resistance is associated with increased nucleotide excision repair (NER), decreased mismatch repair (MMR) and decreased platinum uptake. The objective of this study is to investigate how a novel combination of sodium arsenite (NaAsO2) and hyperthermia (43°C) affect mechanisms of cisplatin resistance in ovarian cancer. METHODS We established a murine model of metastatic EOC by intraperitoneal injection of A2780/CP70 human ovarian cancer cells into nude mice. We developed a murine hyperthermic intraperitoneal chemotherapy model to treat the mice. Mice with peritoneal metastasis were perfused for 1 h with 3 mg/kg cisplatin ± 26 mg/kg NaAsO2 at 37 or 43°C. Tumors and tissues were collected at 0 and 24 h after treatment. RESULTS Western blot analysis of p53 and key NER proteins (ERCC1, XPC and XPA) and MMR protein (MSH2) suggested that cisplatin induced p53, XPC and XPA and suppressed MSH2 consistent with resistant phenotype. Hyperthermia suppressed cisplatin-induced XPC and prevented the induction of XPA by cisplatin, but it had no effect on Pt uptake or retention in tumors. NaAsO2 prevented XPC induction by cisplatin; it maintained higher levels of MSH2 in tumors and enhanced initial accumulation of Pt in tumors. Combined NaAsO2 and hyperthermia decreased cisplatin-induced XPC 24 h after perfusion, maintained higher levels of MSH2 in tumors and significantly increased initial accumulation of Pt in tumors. ERCC1 levels were generally low except for NaAsO2 co-treatment with cisplatin. Systemic Pt and arsenic accumulation for all treatment conditions were in the order: kidney > liver = spleen > heart > brain and liver > kidney = spleen > heart > brain respectively. Metal levels generally decreased in systemic tissues within 24 h after treatment. CONCLUSION NaAsO2 and/or hyperthermia have the potential to sensitize tumors to cisplatin by inhibiting NER, maintaining functional MMR and enhancing tumor platinum uptake.
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Affiliation(s)
- Clarisse S Muenyi
- Department of Pharmacology & Toxicology, University of Louisville, Louisville, KY 40292, USA
| | - Vanessa A States
- Department of Pharmacology & Toxicology, University of Louisville, Louisville, KY 40292, USA
| | - Joshua H Masters
- Department of Pharmacology & Toxicology, University of Louisville, Louisville, KY 40292, USA
| | - Teresa W Fan
- Department of Pharmacology & Toxicology, University of Louisville, Louisville, KY 40292, USA
- Department of Chemistry, University of Louisville, Louisville, KY 40292, USA
- Center for Regulatory and Environmental Analytical Metabolomics, University of Louisville, Louisville, KY 40292, USA
- Center for Genetics & Molecular Medicine, University of Louisville, Louisville, KY 40292, USA
- Center for Environmental Genomics & Integrative Biology, University of Louisville, Louisville, KY 40292, USA
- James Graham Brown Cancer Center, University of Louisville, Louisville, KY 40292, USA
| | - C William Helm
- Department of Obstetrics and Gynecology, Division of Gynecologic Oncology, St. Louis University School of Medicine, St Louis, MO 63117, USA
| | - J Christopher States
- Department of Pharmacology & Toxicology, University of Louisville, Louisville, KY 40292, USA
- Center for Genetics & Molecular Medicine, University of Louisville, Louisville, KY 40292, USA
- Center for Environmental Genomics & Integrative Biology, University of Louisville, Louisville, KY 40292, USA
- James Graham Brown Cancer Center, University of Louisville, Louisville, KY 40292, USA
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Quintal SM, dePaula QA, Farrell NP. Zinc finger proteins as templates for metal ion exchange and ligand reactivity. Chemical and biological consequences. Metallomics 2011; 3:121-39. [PMID: 21253649 DOI: 10.1039/c0mt00070a] [Citation(s) in RCA: 84] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Zinc finger reactions with inorganic ions and coordination compounds are as diverse as the zinc fingers themselves. Use of metal ions such as Co(2+) and Cd(2+) has given structural, thermodynamic and kinetic information on zinc fingers and zinc-finger-DNA/RNA interactions. It is a general truism that alteration of the coordination sphere in the finger environment will disrupt the recognition with DNA/RNA and this has implications for mechanism of toxicity and carcinogenesis of metal ions. Structural zinc fingers are susceptible to electrophilic attack and the recognition that the coordination sphere of inorganic compounds may be modulated for control of electrophilic attack on zinc fingers raises the possibility of systematic studies of zinc fingers as drug targets using inorganic chemistry. Some inorganic compounds such as those of As(III) and Au(I) may exert their biological effects through inactivation of zinc fingers and novel approaches to specifically attack the zinc-bound ligands using Co(III)-Schiff bases and Platinum(II)-Nucleobase compounds have been proposed. The genomic importance of zinc fingers suggests that the "coordination chemistry" of zinc fingers themselves is ripe for exploration to design new targets for medicinal inorganic chemistry.
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Affiliation(s)
- Susana M Quintal
- Department of Chemistry, Virginia Commonwealth University, 1001 W. Main St., Richmond, VA 23284-2006, USA
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Oxidative damage in lymphocytes of copper smelter workers correlated to higher levels of excreted arsenic. Mediators Inflamm 2010; 2010:403830. [PMID: 21253489 PMCID: PMC3022209 DOI: 10.1155/2010/403830] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2010] [Revised: 11/12/2010] [Accepted: 12/12/2010] [Indexed: 01/27/2023] Open
Abstract
Arsenic has been associated with multiple harmful effects at the cellular level. Indirectly these defects could be related to impairment
of the integrity of the immune system, in particular in lymphoid population. To characterize the effect of Arsenic on redox status on this
population, copper smelter workers and arsenic unexposed donors were recruited for this study. We analyzed urine samples
and lymphocyte enriched fractions from donors to determinate arsenic levels and lymphocyte proliferation. Moreover, we studied the
presence of oxidative markers MDA, vitamin E and SOD activity in donor plasma. Here we demonstrated that in human beings
exposed to high arsenic concentrations, lymphocyte MDA and arsenic urinary levels showed a positive correlation with SOD activity,
and a negative correlation with vitamin E serum levels. Strikingly, lymphocytes from the arsenic exposed population respond to
a polyclonal stimulator, phytohemaglutinin, with higher rates of thymidine incorporation than lymphocytes of a control population.
As well, similar in vitro responses to arsenic were observed using a T cell line. Our results suggest that chronic
human exposure to arsenic induces oxidative damage in lymphocytes and could be considered more relevant than evaluation of T cell
surveillance.
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Carew MW, Leslie EM. Selenium-dependent and -independent transport of arsenic by the human multidrug resistance protein 2 (MRP2/ABCC2): implications for the mutual detoxification of arsenic and selenium. Carcinogenesis 2010; 31:1450-5. [DOI: 10.1093/carcin/bgq125] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Chitin and chitosan as multipurpose natural polymers for groundwater arsenic removal and AS2O3 delivery in tumor therapy. Mar Drugs 2010; 8:1518-25. [PMID: 20559486 PMCID: PMC2885078 DOI: 10.3390/md8051518] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2010] [Revised: 04/23/2010] [Accepted: 04/26/2010] [Indexed: 11/21/2022] Open
Abstract
Chitin and chitosan are natural polysaccharide polymers. These polymers have been used in several agricultural, food protection and nutraceutical applications. Moreover, chitin and chitosan have been also used in biomedical and biotechnological applications as drug delivery systems or in pharmaceutical formulations. So far, there are only few studies dealing with arsenic (As) removal from groundwater using chitin or chitosan and no evidence of the use of these natural polymers for arsenic trioxide (As2O3) delivery in tumor therapy. Here we suggest that chitin and/or chitosan might have the right properties to be employed as efficient polymers for such applications. Besides, nanotechnology offers suitable tools for the fabrication of novel nanostructured materials of natural origin. Since different nanostructured materials have already been employed successfully in various multidisciplinary fields, we expect that the integration of nanotechnology and natural polymer chemistry will further lead to innovative applications for environment and medicine.
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