1
|
Ou J, Sun Y, Tong J, Tang W, Ma G. The relationship between serum manganese concentration with all-cause and cause-specific mortality: a retrospective and population-based cross-sectional study. BMC Cardiovasc Disord 2024; 24:229. [PMID: 38678176 PMCID: PMC11055268 DOI: 10.1186/s12872-024-03872-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Accepted: 04/01/2024] [Indexed: 04/29/2024] Open
Abstract
BACKGROUND The study aimed to explore the association between manganese concentration and all-cause, cardiovascular disease (CVD)-related, and cancer-related mortality in the general population of the United States. METHODS We integrated the data from the National Health and Nutrition Examination Survey from 2011 to 2018. A total of 9,207 subjects were selected based on the inclusion and exclusion criteria. The relationship between manganese concentration and all-cause, CVD-related, and cancer-related mortality was analyzed by constructing a Cox proportional hazard regression model and a restricted cubic spline (RCS) plot. Additionally, subgroup analyses stratified by age, sex, race/ethnicity, hypertension, diabetes mellitus (DM), chronic heart disease, chronic heart failure, angina pectoris, heart attack, stroke, and BMI were further performed. RESULTS In the full adjusted model, compared with the lowest quartile, the adjusted hazard ratios with 95% confidence intervals (CIs) for all-cause, CVD-related, and cancer-related mortality across manganese quartiles were (1.11 (0.87,1.41), 0.96 (0.74, 1.23), and 1.23 (0.96, 1.59); P-value for trend =0.041), (0.86 (0.54, 1.37), 0.87 (0.55, 1.40), and 1.07 (0.67, 1.72); P-value for trend =0.906), and (1.45 (0.92, 2.29), 1.14 (0.70, 1.88), and 1.26 (0.75, 2.11); P-value for trend =0.526), respectively. The RCS curve shown a U-shaped association between manganese concentration and all-cause mortality and CVD-related mortality (P-value for nonlinear <0.05). However, there was an increase and then a decrease in the link between manganese concentration and cancer-related mortality (P-value for nonlinear <0.05). Manganese exposure was positively correlated with sex (correlation coefficient, r =0.19, P-value <0.001) and negatively correlated with age (correlation coefficient, r =-0.11, P-value <0.001) and serum creatinine (correlation coefficient, r =-0.12, P-value <0.001), respectively. CONCLUSIONS Our findings suggest that elevated serum manganese concentrations are associated with all-cause and CVD-related mortality in the U.S. population and that maintenance of serum manganese between 8.67-9.23 µg/L may promote public health.
Collapse
Affiliation(s)
- Jianyun Ou
- Department of Cardiology, Zhongda Hospital, Southeast University, 87 Dingjiaqiao, Nanjing, 210009, P.R. China
| | - Yunfei Sun
- Department of Cardiology, Zhongda Hospital, Southeast University, 87 Dingjiaqiao, Nanjing, 210009, P.R. China
| | - Jie Tong
- Department of Cardiology, Zhongda Hospital, Southeast University, 87 Dingjiaqiao, Nanjing, 210009, P.R. China
| | - Weihong Tang
- Department of Cardiology, Zhongda Hospital, Southeast University, 87 Dingjiaqiao, Nanjing, 210009, P.R. China
| | - Genshan Ma
- Department of Cardiology, Zhongda Hospital, Southeast University, 87 Dingjiaqiao, Nanjing, 210009, P.R. China.
| |
Collapse
|
2
|
Shen C, Zhang K, Yang J, Shi J, Yang C, Sun Y, Yang W. Association between metal(loid)s in serum and leukemia: a systematic review and meta-analysis. JOURNAL OF ENVIRONMENTAL HEALTH SCIENCE & ENGINEERING 2023; 21:201-213. [PMID: 37159736 PMCID: PMC10163180 DOI: 10.1007/s40201-023-00853-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2022] [Revised: 01/14/2023] [Accepted: 01/25/2023] [Indexed: 05/11/2023]
Abstract
Purpose Heavy metals and metalloids are recognized as environmental threats, which are considered highly toxic and carcinogenic. Epidemiologically, their association with leukemia is under debate. We aim to clarify the association between the heavy metal(loid)s in serum and leukemia via a systematic review and meta-analysis. Methods We searched PubMed, Embase, Google Scholar, and CNKI (China National Knowledge Infrastructure) databases for all related articles. The standardized mean difference and its 95% confidence interval was used to evaluate the association of leukemia with heavy metal(loid)s in serum. The statistical heterogeneity among studies was assessed with the Q-test and I 2 statistics. Results Among 4,119 articles related to metal(loid)s and leukemia, 21 studies met our inclusion criteria, which are all cross-sectional studies. These 21 studies involved 1,316 cases and 1,310 controls, based on which we evaluate the association of heavy metals/metalloids in serum with leukemia. Our results indicated positive differences for serum chromium, nickel, and mercury in leukemia patients, while a negative difference for serum manganese in acute lymphocytic leukemia (ALL). Conclusion Our results suggested an elevated trend of serum chromium, nickel, and mercury concentrations in leukemia patients while descending trend of serum manganese concentration in ALL patients. The result of sensitivity analysis between lead, cadmium, and leukemia and publication bias of association between chromium and leukemia also needed attention. Future research work may focus on the dose-response relationship between any of these elements and the leukemia risks, and further elucidation of how these elements are related to leukemia may shed light on the prevention and treatment of leukemia. Supplementary Information The online version contains supplementary material available at 10.1007/s40201-023-00853-2.
Collapse
Affiliation(s)
- Chengchen Shen
- Department of Physiology, West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, 610041 Chengdu, Sichuan People’s Republic of China
| | - Kui Zhang
- Department of Forensic Pathology, West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, 610041 Chengdu, Sichuan People’s Republic of China
| | - Jingxuan Yang
- Department of Physiology, West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, 610041 Chengdu, Sichuan People’s Republic of China
| | - Jingyi Shi
- Department of Physiology, West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, 610041 Chengdu, Sichuan People’s Republic of China
| | - Chan Yang
- Department of Physiology, West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, 610041 Chengdu, Sichuan People’s Republic of China
| | - Yanan Sun
- Department of Physiology, West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, 610041 Chengdu, Sichuan People’s Republic of China
| | - Wenxing Yang
- Department of Physiology, West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, 610041 Chengdu, Sichuan People’s Republic of China
| |
Collapse
|
3
|
Naseri T, Mousavi SM, Kuchta K. Environmentally sustainable and cost-effective recycling of Mn-rich Li-ion cells waste: Effect of carbon sources on the leaching efficiency of metals using fungal metabolites. WASTE MANAGEMENT (NEW YORK, N.Y.) 2023; 157:47-59. [PMID: 36525879 DOI: 10.1016/j.wasman.2022.11.043] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2022] [Revised: 11/28/2022] [Accepted: 11/30/2022] [Indexed: 06/17/2023]
Abstract
Metals recovery from spent lithium coin cells (SCCs) is enjoying great attention due to environmental problems and metal-rich contents such as Mn and Li. Fungi can generate many organic acids, and metals can be dissolved, but sucrose is not an economical medium. The main objective of this study is to find a suitable carbon substrate in place of sucrose for fungal bioleaching. We have developed an environmentally friendly, cost-effective, and green method for recycling and detoxifying Mn and Li from SCCs using the spent culture medium fromPenicillium citrinumcultivation. Sugar cane molasses and sucrose were selected as carbon sources. Based on the extracted fungal metabolites, the effects of pulp density, temperature, and leaching time were assessed on metal dissolution. The most suitable conditions were 30 g/L of pulp density, a temperature of 40 °C, and 4 days of leaching time in spent molasses medium, which led to a high extraction of 87% Mn and 100% Li. Based on EDX-mapping analyses, it was found that the initial concentration of ∑ (Mn + C) in the SCCs powder was almost 100% while reaching nearly 6.4% after bioleaching. After bioleaching, an analysis of residual powder confirmed that metal dissolution from SCCs was effective owing to fungal metabolites. The economic study showed that the bioleaching method is more valuable for the dissolution of metals than the chemical method; In addition to improving bioleaching efficiency, molasses carbon sources can be used for industrial purposes.
Collapse
Affiliation(s)
- Tannaz Naseri
- Biotechnology Group, Chemical Engineering Department, Tarbiat Modares University, Tehran, Iran; Circular Resource Engineering and Management (CREM), Institute of Environmental Technology and Energy Economics, Hamburg University of Technology, Blohmstr. 15, 21079 Hamburg, Germany
| | - Seyyed Mohammad Mousavi
- Biotechnology Group, Chemical Engineering Department, Tarbiat Modares University, Tehran, Iran; Modares Environmental Research Institute, Tarbiat Modares University, Tehran, Iran.
| | - Kerstin Kuchta
- Circular Resource Engineering and Management (CREM), Institute of Environmental Technology and Energy Economics, Hamburg University of Technology, Blohmstr. 15, 21079 Hamburg, Germany
| |
Collapse
|
4
|
Kruger E, Toraih EA, Hussein MH, Shehata SA, Waheed A, Fawzy MS, Kandil E. Thyroid Carcinoma: A Review for 25 Years of Environmental Risk Factors Studies. Cancers (Basel) 2022; 14:cancers14246172. [PMID: 36551665 PMCID: PMC9777404 DOI: 10.3390/cancers14246172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Revised: 12/07/2022] [Accepted: 12/13/2022] [Indexed: 12/23/2022] Open
Abstract
Environmental factors are established contributors to thyroid carcinomas. Due to their known ability to cause cancer, exposure to several organic and inorganic chemical toxicants and radiation from nuclear weapons, fallout, or medical radiation poses a threat to global public health. Halogenated substances like organochlorines and pesticides can interfere with thyroid function. Like phthalates and bisphenolates, polychlorinated biphenyls and their metabolites, along with polybrominated diethyl ethers, impact thyroid hormones biosynthesis, transport, binding to target organs, and impair thyroid function. A deeper understanding of environmental exposure is crucial for managing and preventing thyroid cancer. This review aims to investigate the relationship between environmental factors and the development of thyroid cancer.
Collapse
Affiliation(s)
- Eva Kruger
- School of Medicine, Tulane University, New Orleans, LA 70112, USA
| | - Eman A. Toraih
- Division of Endocrine and Oncologic Surgery, Department of Surgery, School of Medicine, Tulane University, New Orleans, LA 70112, USA
- Medical Genetics Unit, Department of Histology and Cell Biology, Faculty of Medicine, Suez Canal University, Ismailia 41522, Egypt
- Correspondence: (E.A.T.); (M.S.F.)
| | - Mohammad H. Hussein
- Division of Endocrine and Oncologic Surgery, Department of Surgery, School of Medicine, Tulane University, New Orleans, LA 70112, USA
| | - Shaimaa A. Shehata
- Department of Forensic Medicine and Clinical Toxicology, Faculty of Medicine, Suez Canal University, Ismailia 41522, Egypt
| | - Amani Waheed
- Department of Community Medicine, Faculty of Medicine, Suez Canal University, Ismailia 41522, Egypt
| | - Manal S. Fawzy
- Department of Medical Biochemistry and Molecular Biology, Faculty of Medicine, Suez Canal University, Ismailia 41522, Egypt
- Department of Biochemistry, Faculty of Medicine, Northern Border University, Arar 1321, Saudi Arabia
- Correspondence: (E.A.T.); (M.S.F.)
| | - Emad Kandil
- Division of Endocrine and Oncologic Surgery, Department of Surgery, School of Medicine, Tulane University, New Orleans, LA 70112, USA
| |
Collapse
|
5
|
Toman R, Psenkova M, Tancin V, Miskeje M. Mutagens in raw ewe milk in Orava region, northern Slovakia: metals. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:62259-62271. [PMID: 35604602 DOI: 10.1007/s11356-022-20871-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Accepted: 05/12/2022] [Indexed: 06/15/2023]
Abstract
The aim of this work was to determine the concentrations of selected mutagenic elements (As, Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb, and Se) in raw ewe milk from undisturbed environment in Orava region, northern Slovakia. There are possible sources of some of the analyzed metals which may be distributed from the metallurgical plants located in the Ostrava region, Czech Republic, and Katowice, Poland. In total, forty milk samples were analyzed in June and August using an inductively coupled plasma optical emission spectrometry. The differences in elements concentrations between the seasonal periods were not significant except of iron (p < 0.0001). The concentrations of most of the metals in ewe milk were low and under the permissible or recommended limits. However, arsenic and selenium concentrations were elevated and could pose a risk of the mutagenic effect, particularly in children. The frequency of element occurrence in June was as follows: Se > Fe > As > Cu > Mn > Ni > Co > Pb > Cr > Cd, and in August: Se > Fe = As > Cu > Mn > Pb > Co > Ni > Cr > Cd. The correlation analysis revealed very strong positive correlation between Cu:Pb (p < 0.05), very strong negative correlation between Fe:Se (p < 0.05). The strong correlations were also found between other elements. The present study showed that milk produced in the relatively undisturbed environment might contain various mutagenic elements. The relationships between the elements might result in the additive or synergistic effects of elements and increase the risk of their mutagenic effects even in low concentrations. Therefore, attention must be paid to the monitoring of metals in the areas where food sources destined especially for child nutrition are produced.
Collapse
Affiliation(s)
- Robert Toman
- Slovak University of Agriculture, Tr. A. Hlinku 2, 94976, Nitra, Slovak Republic.
| | - Martina Psenkova
- Slovak University of Agriculture, Tr. A. Hlinku 2, 94976, Nitra, Slovak Republic
| | - Vladimir Tancin
- Slovak University of Agriculture, Tr. A. Hlinku 2, 94976, Nitra, Slovak Republic
| | - Michal Miskeje
- Slovak University of Agriculture, Tr. A. Hlinku 2, 94976, Nitra, Slovak Republic
| |
Collapse
|
6
|
Londonio A, Morzan E, Smichowski P. Simultaneous on-line preconcentration and determination of toxic elements in rice and rice-based products by SPE–ICP–MS: Multiple response optimization. J Food Compost Anal 2022. [DOI: 10.1016/j.jfca.2022.104388] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
|
7
|
van Gerwen M, Alerte E, Alsen M, Little C, Sinclair C, Genden E. The role of heavy metals in thyroid cancer: A meta-analysis. J Trace Elem Med Biol 2022; 69:126900. [PMID: 34798515 DOI: 10.1016/j.jtemb.2021.126900] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Revised: 08/10/2021] [Accepted: 11/04/2021] [Indexed: 12/20/2022]
Abstract
INTRODUCTION Metal ions are known to accumulate in the thyroid and some play an important role in the function and homeostatic mechanisms of the thyroid gland. Certain metal ions are known endocrine disruptors while others are classified to be carcinogenic. Although higher thyroid cancer incidence rates have been reported in regions with high metal levels in soil and drinking water, including volcanic regions, the effect of heavy metals on the thyroid is still poorly understood. To investigate the association between heavy metals and thyroid cancer, a comprehensive meta-analysis was performed to draw a more evidence-based conclusion for individual metal ions. MATERIAL AND METHODS Nineteen studies were included in this meta-analysis, of which 9 studies reported blood metal ion levels, 8 studies reported tissue metal ion levels and 2 studies reported blood and tissue metal ion levels. The standardized mean difference (SMD) was calculated between thyroid cancer patients group and a control group (benign thyroid patients group or healthy controls group) per study. RESULTS A significant positive SMD in manganese tissue levels between thyroid cancer patients and benign thyroid patients (SMD: 0.56 (95 % CI: 0.16, 0.95)) and a significant negative SMD in cobalt blood levels between thyroid cancer patients and healthy controls (SMD: -2.03 (95 % CI: -3.95, -0.10)) was found. No difference in levels of other metals in blood or thyroid tissue between thyroid cancer patients and non-thyroid cancer patients was noted. DISCUSSION AND CONCLUSION The present meta-analysis therefore demonstrates the urgent need for future studies, especially given the increasing exposure of the general population to various environmental pollutants, including metal ions, and the thyroid cancer burden worldwide.
Collapse
Affiliation(s)
- Maaike van Gerwen
- Department of Otolaryngology-Head and Neck Surgery, Icahn School of Medicine at Mount Sinai, New York, NY, 10029, USA; Institute for Translational Epidemiology, Icahn School of Medicine at Mount Sinai, New York, NY, 10029, USA.
| | - Eric Alerte
- Department of Medical Education, Icahn School of Medicine at Mount Sinai, New York, NY, 10029, USA.
| | - Mathilda Alsen
- Department of Otolaryngology-Head and Neck Surgery, Icahn School of Medicine at Mount Sinai, New York, NY, 10029, USA.
| | - Christine Little
- Department of Medical Education, Icahn School of Medicine at Mount Sinai, New York, NY, 10029, USA.
| | - Catherine Sinclair
- Department of Otolaryngology-Head and Neck Surgery, Icahn School of Medicine at Mount Sinai, New York, NY, 10029, USA.
| | - Eric Genden
- Department of Otolaryngology-Head and Neck Surgery, Icahn School of Medicine at Mount Sinai, New York, NY, 10029, USA.
| |
Collapse
|
8
|
Abstract
Trace elements, such as iodine and selenium (Se), are vital to human health and play an essential role in metabolism. They are also important to thyroid metabolism and function, and correlate with thyroid autoimmunity and tumors. Other minerals such as iron (Ir), lithium (Li), copper (Co), zinc (Zn), manganese (Mn), magnesium (Mg), cadmium (Cd), and molybdenum (Mo), may related to thyroid function and disease. Normal thyroid function depends on a variety of trace elements for thyroid hormone synthesis and metabolism. These trace elements interact with each other and are in a dynamic balance. However, this balance may be disturbed by the excess or deficiency of one or more elements, leading to abnormal thyroid function and the promotion of autoimmune thyroid diseases and thyroid tumors.The relationship between trace elements and thyroid disorders is still unclear, and further research is needed to clarify this issue and improve our understanding of how trace elements mediate thyroid function and metabolism. This paper systematically reviewed recently published literature on the relationship between various trace elements and thyroid function to provide a preliminary theoretical basis for future research.
Collapse
Affiliation(s)
- Qing Zhou
- Department of Thyroid Surgery, General Surgery Center, The Hospital of Jilin University, Changchun, China
| | - Shuai Xue
- Department of Thyroid Surgery, General Surgery Center, The Hospital of Jilin University, Changchun, China
- *Correspondence: Shuai Xue, ; Guang Chen,
| | - Li Zhang
- Department of Nephrology, The Hospital of Jilin University, Changchun, China
| | - Guang Chen
- Department of Thyroid Surgery, General Surgery Center, The Hospital of Jilin University, Changchun, China
- *Correspondence: Shuai Xue, ; Guang Chen,
| |
Collapse
|
9
|
Li Z, Long T, Wang R, Feng Y, Hu H, Xu Y, Wei Y, Wang F, Guo H, Zhang X, He M. Plasma metals and cancer incidence in patients with type 2 diabetes. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 758:143616. [PMID: 33218808 DOI: 10.1016/j.scitotenv.2020.143616] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Revised: 10/29/2020] [Accepted: 10/30/2020] [Indexed: 06/11/2023]
Abstract
There is limited evidence on the relationships between plasma levels of multiple metals and risk of incident cancer in patients with type 2 diabetes mellitus (T2DM). We examined the associations between plasma levels of 12 metals (iron, copper, zinc, selenium, chromium, manganese, molybdenum, cobalt, nickel, arsenic, cadmium, and lead) and cancer risk in 4573 T2DM patients using Cox proportional hazards models. With a median follow-up of 10.2 years, 541 incident cancers were identified. The multiple-metals model revealed that each 1-SD increase in ln-transformed plasma copper (HR: 1.14; 95%CI: 1.02, 1.27) and lead (HR:1.20; 95%CI:1.03, 1.39) were significantly associated with increased cancer incidence while each 1-SD increase in ln-transformed plasma zinc (HR: 0.82; 95%CI: 0.71, 0.96) and chromium (HR: 0.88; 95%CI: 0.82, 0.94) were significantly associated with decreased cancer incidence. When all participants were further stratified into four subgroups by the quartile levels (Q1-4) of plasma metals, manganese showed significant positive associations with cancer incidence in the upper two quartiles (P trend = 0.003) while nickel showed significant negative associations with cancer incidence in Q2 and 4 groups (P trend = 0.033) compared with participants in Q1 group. Collectively, monitoring of metal levels in diabetic patients needs to be strengthened, which is of great significance for the prevention of incident cancer.
Collapse
Affiliation(s)
- Zhaoyang Li
- Department of Occupational and Environmental Health and State Key Laboratory of Environmental Health for Incubating, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Tengfei Long
- Department of Occupational and Environmental Health and State Key Laboratory of Environmental Health for Incubating, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Ruixin Wang
- Department of Occupational and Environmental Health and State Key Laboratory of Environmental Health for Incubating, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Yue Feng
- Department of Occupational and Environmental Health and State Key Laboratory of Environmental Health for Incubating, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Hua Hu
- Department of Occupational and Environmental Health and State Key Laboratory of Environmental Health for Incubating, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Yali Xu
- Department of Occupational and Environmental Health and State Key Laboratory of Environmental Health for Incubating, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Yue Wei
- Department of Occupational and Environmental Health and State Key Laboratory of Environmental Health for Incubating, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Fei Wang
- Department of Occupational and Environmental Health and State Key Laboratory of Environmental Health for Incubating, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Huan Guo
- Department of Occupational and Environmental Health and State Key Laboratory of Environmental Health for Incubating, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Xiaomin Zhang
- Department of Occupational and Environmental Health and State Key Laboratory of Environmental Health for Incubating, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Meian He
- Department of Occupational and Environmental Health and State Key Laboratory of Environmental Health for Incubating, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.
| |
Collapse
|
10
|
Malandrino P, Russo M, Gianì F, Pellegriti G, Vigneri P, Belfiore A, Rizzarelli E, Vigneri R. Increased Thyroid Cancer Incidence in Volcanic Areas: A Role of Increased Heavy Metals in the Environment? Int J Mol Sci 2020; 21:ijms21103425. [PMID: 32408629 PMCID: PMC7279170 DOI: 10.3390/ijms21103425] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Revised: 05/09/2020] [Accepted: 05/09/2020] [Indexed: 12/19/2022] Open
Abstract
Thyroid cancer incidence is significantly increased in volcanic areas, where relevant non-anthropogenic pollution with heavy metals is present in the environment. This review will discuss whether chronic lifelong exposure to slightly increased levels of metals can contribute to the increase in thyroid cancer in the residents of a volcanic area. The influence of metals on living cells depends on the physicochemical properties of the metals and their interaction with the target cell metallostasis network, which includes transporters, intracellular binding proteins, and metal-responsive elements. Very little is known about the carcinogenic potential of slightly increased metal levels on the thyroid, which might be more sensitive to mutagenic damage because of its unique biology related to iodine, which is a very reactive and strongly oxidizing agent. Different mechanisms could explain the specific carcinogenic effect of borderline/high environmental levels of metals on the thyroid, including (a) hormesis, the nonlinear response to chemicals causing important biological effects at low concentrations; (b) metal accumulation in the thyroid relative to other tissues; and (c) the specific effects of a mixture of different metals. Recent evidence related to all of these mechanisms is now available, and the data are compatible with a cause–effect relationship between increased metal levels in the environment and an increase in thyroid cancer incidence.
Collapse
Affiliation(s)
- Pasqualino Malandrino
- Endocrinology, Department of Clinical and Experimental Medicine, University of Catania, Garibaldi-Nesima Medical Center, 95122 Catania, Italy; (P.M.); (M.R.); (F.G.); (G.P.); (A.B.)
| | - Marco Russo
- Endocrinology, Department of Clinical and Experimental Medicine, University of Catania, Garibaldi-Nesima Medical Center, 95122 Catania, Italy; (P.M.); (M.R.); (F.G.); (G.P.); (A.B.)
| | - Fiorenza Gianì
- Endocrinology, Department of Clinical and Experimental Medicine, University of Catania, Garibaldi-Nesima Medical Center, 95122 Catania, Italy; (P.M.); (M.R.); (F.G.); (G.P.); (A.B.)
| | - Gabriella Pellegriti
- Endocrinology, Department of Clinical and Experimental Medicine, University of Catania, Garibaldi-Nesima Medical Center, 95122 Catania, Italy; (P.M.); (M.R.); (F.G.); (G.P.); (A.B.)
| | - Paolo Vigneri
- Medical Oncology and the Center of Experimental Oncology and Hematology, Department of Clinical and Experimental Medicine, University of Catania, A.O.U. Policlinico Vittorio Emanuele, 95125 Catania, Italy;
| | - Antonino Belfiore
- Endocrinology, Department of Clinical and Experimental Medicine, University of Catania, Garibaldi-Nesima Medical Center, 95122 Catania, Italy; (P.M.); (M.R.); (F.G.); (G.P.); (A.B.)
| | - Enrico Rizzarelli
- Department of Chemical Sciences, University of Catania, 95125 Catania, Italy;
- Consiglio Nazionale delle Ricerche, Cristallography Institute (Catania Section), via P. Gaifami 18, 95126 Catania, Italy
- Consorzio Interuniversitario di Ricerca in Chimica dei Metalli nei Sistemi Biologici (CIRCMSB), via Celso Ulpiani 27, 70126 Bari, Italy
| | - Riccardo Vigneri
- Endocrinology, Department of Clinical and Experimental Medicine, University of Catania, Garibaldi-Nesima Medical Center, 95122 Catania, Italy; (P.M.); (M.R.); (F.G.); (G.P.); (A.B.)
- Consiglio Nazionale delle Ricerche, Cristallography Institute (Catania Section), via P. Gaifami 18, 95126 Catania, Italy
- Correspondence: ; Tel.: +39-095-759-8747
| |
Collapse
|
11
|
Malandrino P, Russo M, Ronchi A, Moretti F, Gianì F, Vigneri P, Masucci R, Pellegriti G, Belfiore A, Vigneri R. Concentration of Metals and Trace Elements in the Normal Human and Rat Thyroid: Comparison with Muscle and Adipose Tissue and Volcanic Versus Control Areas. Thyroid 2020; 30:290-299. [PMID: 31880996 DOI: 10.1089/thy.2019.0244] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Background: The concentration of trace elements and metals in the thyroid is the result of exposure, uptake, retention, and clearance. The specificity and selectivity of thyroid capacity to concentrate these elements relative to other tissues are not known. To obtain this information, we measured the tissue concentration of 26 elements in the thyroid, muscle, and fat of euthyroid human subjects and also in normal rats. Methods: At programmed surgery, small (<1 g) tissue fragments were collected in 77 euthyroid subjects. Macroscopically normal thyroid tissue, sternothyroid muscle, and neck subcutaneous fat samples were excised, and thyroid tissue was confirmed to be morphologically normal through microscopy. Tissue specimens (thyroid, hindlimb muscle, and abdominal fat) were also obtained from normal rats. Measurements of trace elements were performed on tissues using inductively coupled plasma mass spectrometry (DRC-ICP-MS). Results: Only 19 of the 26 investigated elements were measurable as 7 elements were below the limit of detection. The ranking concentration in human thyroid tissue, not considering iodide, indicated that Zn, Br, Cu, Cr, Se, and Mn represented over 95% of the measured elements. A similar ranking was observed in the rat thyroid. A comparison with other tissues indicated that in addition to I, also Br, Mn, Se, and Sn were significantly more concentrated in the thyroid, and this was also the case for the recognized carcinogens As, Cd, and Hg. As and Hg, but not Cd (which was not detectable in any of the rat tissues), were also more concentrated in the rat thyroid. Since human thyroid specimens were also obtained from residents of a volcanic area, where environmental pollution may cause human biocontamination, we compared the trace element concentration in specimens from the volcanic area with controls. Many trace elements were slightly, but not significantly, increased in the volcanic area specimens. Conclusions: In the normal human thyroid, many trace elements, including Br, Mn, Se, and Sn, and the recognized carcinogens, As, Cd, and Hg, are significantly more concentrated than in muscle and fat of the same individual. Similar data were observed in rats. The reason for the differential element accumulation in the thyroid is unclear; a better understanding may be useful to further clarify thyroid biology.
Collapse
Affiliation(s)
- Pasqualino Malandrino
- Endocrinology, Department of Clinical and Experimental Medicine, University of Catania, Garibaldi-Nesima Medical Center, Catania, Italy
| | - Marco Russo
- Endocrinology, Department of Clinical and Experimental Medicine, University of Catania, Garibaldi-Nesima Medical Center, Catania, Italy
| | - Anna Ronchi
- Laboratory of Experimental and Clinical Toxicology-Toxicology Unit, Maugeri Clinical Scientific Institute Spa-SC, IRCCS Pavia, Pavia, Italy
| | - Fabiola Moretti
- Institute of Cell Biology and Neurobiology, National Research Council of Italy, Roma, Italy
| | - Fiorenza Gianì
- Endocrinology, Department of Clinical and Experimental Medicine, University of Catania, Garibaldi-Nesima Medical Center, Catania, Italy
| | - Paolo Vigneri
- Medical Oncology, Department of Clinical and Experimental Medicine, University of Catania, Catania, Italy
| | - Romilda Masucci
- Surgical Oncology, Garibaldi-Nesima Medical Center, Catania, Italy
| | - Gabriella Pellegriti
- Endocrinology, Department of Clinical and Experimental Medicine, University of Catania, Garibaldi-Nesima Medical Center, Catania, Italy
| | - Antonino Belfiore
- Endocrinology, Department of Clinical and Experimental Medicine, University of Catania, Garibaldi-Nesima Medical Center, Catania, Italy
| | - Riccardo Vigneri
- Endocrinology, Department of Clinical and Experimental Medicine, University of Catania, Garibaldi-Nesima Medical Center, Catania, Italy
- Section of Catania, Institute of Biostructures and Bioimages of the National Research Council (CNR-IBB), Catania, Italy
| |
Collapse
|
12
|
Fiore M, Oliveri Conti G, Caltabiano R, Buffone A, Zuccarello P, Cormaci L, Cannizzaro MA, Ferrante M. Role of Emerging Environmental Risk Factors in Thyroid Cancer: A Brief Review. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2019; 16:ijerph16071185. [PMID: 30986998 PMCID: PMC6480006 DOI: 10.3390/ijerph16071185] [Citation(s) in RCA: 89] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 01/28/2019] [Revised: 03/22/2019] [Accepted: 03/30/2019] [Indexed: 12/24/2022]
Abstract
Environmental factors are recognized as risk factors of thyroid cancer in humans. Exposure to radiation, both from nuclear weapon or fallout or medical radiation, and to some organic and inorganic chemical toxicants represent a worldwide public health issue for their proven carcinogenicity. Halogenated compounds, such as organochlorines and pesticides, are able to disrupt thyroid function. Polychlorinated biphenyls and their metabolites and polybrominated diethyl ethers bind to thyroid, transport proteins, replace thyroxin, and disrupt thyroid function as phthalates and bisphenolates do, highly mimicking thyroid hormones. A better knowledge of environmental risks represents a very important tool for cancer prevention through true risks prevention and management. This approach is very important because of the epigenetic origin’s theory of cancer. Therefore, the aim of this review was study the association between environmental agents and thyroid cancer promotion.
Collapse
Affiliation(s)
- Maria Fiore
- Environmental and Food Hygiene Laboratories (LIAA), Department of Medical Sciences, Surgical and Advanced Technologies "G.F. Ingrassia", University of Catania, 95123 Catania, Italy.
| | - Gea Oliveri Conti
- Environmental and Food Hygiene Laboratories (LIAA), Department of Medical Sciences, Surgical and Advanced Technologies "G.F. Ingrassia", University of Catania, 95123 Catania, Italy.
| | - Rosario Caltabiano
- Department of Medical and Surgical Sciences and Advanced Technologies, "G.F. Ingrassia", Section of Anatomic Pathology, 95123 Catania, Italy.
| | - Antonino Buffone
- Department of General Surgery and Specialty Medical Surgery, Endocrine surgery, A.O.U. Policlinico-Vittorio Emanuele P.O. G. Rodolico, University of Catania, 95123 Catania, Italy.
| | - Pietro Zuccarello
- Environmental and Food Hygiene Laboratories (LIAA), Department of Medical Sciences, Surgical and Advanced Technologies "G.F. Ingrassia", University of Catania, 95123 Catania, Italy.
| | - Livia Cormaci
- Hygiene and Preventive Medicine Specializaton School, Department of Medical and Surgical Sciences and Advanced Technologies, "G.F. Ingrassia", 95123 Catania, Italy.
| | - Matteo Angelo Cannizzaro
- Chirugia Generale, Department of Medical and Surgical Sciences and Advanced Technologies, "G.F. Ingrassia", 95123 Catania, Italy.
| | - Margherita Ferrante
- Environmental and Food Hygiene Laboratories (LIAA), Department of Medical Sciences, Surgical and Advanced Technologies "G.F. Ingrassia", University of Catania, 95123 Catania, Italy.
| |
Collapse
|
13
|
Amballa RG, Veeravalli CS, Ganta RK, Korupolu RB, Nowduri A. Mn(II) Catalyzed Oxidation of Atenolol by Cerium(IV) in Aqueous Sulfuric Acid Medium: A Spectrophotometer Aided Kinetic, Mechanistic and Thermodynamic Study. Z PHYS CHEM 2017. [DOI: 10.1515/zpch-2017-0985] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
The kinetics and mechanism of manganese(II) catalyzed oxidation of atenolol by cerium(IV) sulfate in aqueous H2SO4 at a constant ionic strength of 0.50 mol dm-3 was studied spectrophotometrically. The reaction showed first order kinetics in cerium(IV) whereas fractional order in both manganese(II) and atenolol. Addition of products showed no effect on the rate of the reaction. The main product, 2-(4-(2-hydroxy-3-oxopropoxy)phenyl)acetamide, was identified with the aid of IR and mass spectral data. Stoichiometry with respect to the drug substrate and reagent was established as 2:1. Added H2SO4, SO4
2− and HSO4
− showed negligible effect on the rate of the reaction. HCe(SO4)3
− was found to be the predominant reactive species under the specified experimental conditions. The rate constants (k), catalytic constant (kc
) and equilibrium constant (K
6) for the proposed mechanism were determined. The kinetic and thermodynamic activation parameters were computed for both the slow rate determining step and complex forming equilibrium step.
Collapse
Affiliation(s)
- Ram Gopal Amballa
- Dr V S Krishna Govt. Degree (A) and PG College , Visakhapatnam 530013 , India , Tel.: +919441247706, e-mail:
- Department of Engineering Chemistry, AUCE (A) , Andhra University , Visakhapatnam 530003 , India
| | | | - Ravi Kumar Ganta
- Department of Engineering Chemistry, AUCE (A) , Andhra University , Visakhapatnam 530003 , India
| | - Raghu Babu Korupolu
- Department of Engineering Chemistry, AUCE (A) , Andhra University , Visakhapatnam 530003 , India
| | - Annapurna Nowduri
- Department of Engineering Chemistry, AUCE (A) , Andhra University , Visakhapatnam 530003 , India
| |
Collapse
|
14
|
Marcon AE, Navoni JA, de Oliveira Galvão MF, Garcia ACFS, do Amaral VS, Petta RA, Campos TFDC, Panosso R, Quinelato AL, de Medeiros SRB. Mutagenic potential assessment associated with human exposure to natural radioactivity. CHEMOSPHERE 2017; 167:36-43. [PMID: 27705811 DOI: 10.1016/j.chemosphere.2016.09.136] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2016] [Revised: 09/20/2016] [Accepted: 09/26/2016] [Indexed: 06/06/2023]
Abstract
Lucrécia city, known to harbor a high cancer rate, is located in a semiarid region characterized by the presence of mineral reservoirs, facing a high exposure to metal and natural radioactivity. The present study aimed to assess the environmental scenario at a semiarid region located in Northeastern Brazil. Metal concentration, alpha and beta radiation, and cyanobacteria content in tap water along with indoor radon and gamma emitters (U, K and Th) concentrations were measured. In addition, mutagenic and nuclear instability effects were assessed using buccal micronucleus cytome assay. The study included five samplings corresponding to a period between 2007 and 2009. Drinking water from Lucrécia city presented levels of Mn, Ni and Cr along with cyanobacteria in concentrations one to four times higher than regulatory guidelines considered. Furthermore, high levels of all the tested radionuclides were found. A high percentage of the houses included in this study presented indoor radon concentrations over 100 Bq m-3. The mean annual effective dose from Lucrécia houses was six times higher than observed in a control region. The levels of exposure in most of the Lucrécia houses were classified as middle to high. A significant mutagenic effect, represented as an increase of micronuclei (MN) frequency and nuclear abnormalities as nuclear buds (NB), binucleated cells (BN), and pyknotic cells (PYC) were found. The results obtained highlight the role of high background radioactivity on the observed mutagenic effect and could help to explain the exacerbated cancer rate reported in this locality.
Collapse
Affiliation(s)
- Alexandre Endres Marcon
- Graduate Program in Health Sciences, Center for Health Sciences, Federal University of Rio Grande do Norte, Natal, RN, Brazil
| | - Julio Alejandro Navoni
- Graduate Program in Development and Environment, Biosciences Center, Federal University of Rio Grande do Norte, Natal, RN, Brazil
| | | | | | - Viviane Souza do Amaral
- Graduate Program in Development and Environment, Biosciences Center, Federal University of Rio Grande do Norte, Natal, RN, Brazil; Graduate Program in Biochemistry, Biosciences Center, Federal University of Rio Grande do Norte, Natal, RN, Brazil; Department of Cell Biology and Genetics, Biosciences Center, Federal University of Rio Grande do Norte, Natal, RN, Brazil
| | - Reinaldo Antônio Petta
- Geology Department, Center for Exact and Earth Sciences, Federal University of Rio Grande do Norte, Natal, RN, Brazil
| | | | - Renata Panosso
- Department of Microbiology and Parasitology, Biosciences Center, Federal University of Rio Grande do Norte, Natal, RN, Brazil
| | | | - Sílvia Regina Batistuzzo de Medeiros
- Graduate Program in Health Sciences, Center for Health Sciences, Federal University of Rio Grande do Norte, Natal, RN, Brazil; Graduate Program in Development and Environment, Biosciences Center, Federal University of Rio Grande do Norte, Natal, RN, Brazil; Graduate Program in Biochemistry, Biosciences Center, Federal University of Rio Grande do Norte, Natal, RN, Brazil; Department of Cell Biology and Genetics, Biosciences Center, Federal University of Rio Grande do Norte, Natal, RN, Brazil.
| |
Collapse
|
15
|
A survey of the mechanisms of action of anticancer transition metal complexes. Future Med Chem 2016; 8:2263-2286. [DOI: 10.4155/fmc-2016-0153] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Metal complexes have been the subject of numerous investigations in oncology but, despite the plethora of newly synthesized compounds, their precise mechanisms of action remain generally unknown or, for the best, incompletely determined. The continuous development of efficient and sensitive techniques in analytical chemistry and molecular biology gives scientists new tools to gather information on how metal complexes can be effective toward cancer. This review focuses on recent findings about the anticancer mechanism of action of metal complexes and how the ligands can be used to tune their pharmacological and physicochemical properties.
Collapse
|
16
|
|
17
|
Freire C, Koifman RJ, Fujimoto D, de Oliveira Souza VC, Barbosa F, Koifman S. Reference values of cadmium, arsenic and manganese in blood and factors associated with exposure levels among adult population of Rio Branco, Acre, Brazil. CHEMOSPHERE 2015; 128:70-8. [PMID: 25655821 DOI: 10.1016/j.chemosphere.2014.12.083] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2014] [Revised: 11/20/2014] [Accepted: 12/22/2014] [Indexed: 05/12/2023]
Abstract
This study aimed to investigate the distribution and factors influencing blood levels of Cadmium (Cd), Arsenic (As), and Manganese (Mn), and to determine their reference values in a sample of blood donors residing in Rio Branco, capital city of Acre State, Brazil. Blood samples were collected from all blood donors attending the Central Hemotherapic Unit in Rio Branco between 2010 and 2011. Among these, 1183 donors (98.9%) answered to a questionnaire on sociodemographic and lifestyle factors. Blood metal concentrations were determined by atomic spectrometry. Association between Cd, As and Mn levels and donors' characteristics was examined by linear regression analysis. Reference values were estimated as the upper limit of the 95% confidence interval of the 95th percentile of metal levels. References values were 0.87 μg L(-1) for Cd, 9.87 μg L(-1) for As, and 29.32 μg L(-1) for Mn. Reference values of Cd and As in smokers were 2.66 and 10.86 μg L(-1), respectively. Factors contributing to increase Cd levels were smoking, ethnicity (non-white), and lower education, whereas drinking tea and non-bottled water were associated with lower Cd. Lower levels of As were associated with higher household income, living near industrial facilities, working in a glass factory, a compost plant or in metal mining activities. Risk factors for Mn exposure were not identified. In general, blood Cd concentrations were in the range of exposure levels reported for other people from the general population, whereas levels of As and Mn were higher than in other non-occupationally exposed populations elsewhere.
Collapse
Affiliation(s)
- Carmen Freire
- National School of Public Health, Oswaldo Cruz Foundation, CEP: 21041-210, Rio de Janeiro, RJ, Brazil.
| | - Rosalina Jorge Koifman
- National School of Public Health, Oswaldo Cruz Foundation, CEP: 21041-210, Rio de Janeiro, RJ, Brazil.
| | - Denys Fujimoto
- Federal University of Acre, CEP: 69920-900, Rio Branco, AC, Brazil.
| | | | - Fernando Barbosa
- School of Pharmaceutical Sciences, University of São Paulo, CEP: 14050-220, Ribeirão Preto, SP, Brazil.
| | - Sergio Koifman
- National School of Public Health, Oswaldo Cruz Foundation, CEP: 21041-210, Rio de Janeiro, RJ, Brazil.
| |
Collapse
|
18
|
Claxton LD. The history, genotoxicity, and carcinogenicity of carbon-based fuels and their emissions: Part 5. Summary, comparisons, and conclusions. MUTATION RESEARCH-REVIEWS IN MUTATION RESEARCH 2015; 763:103-47. [DOI: 10.1016/j.mrrev.2014.10.001] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2014] [Revised: 10/04/2014] [Accepted: 10/06/2014] [Indexed: 12/19/2022]
|
19
|
Willhite CC, Bhat VS, Ball GL, McLellan CJ. Emergency Do Not Consume/Do Not Use concentrations for potassium permanganate in drinking water. Hum Exp Toxicol 2012; 32:275-98. [DOI: 10.1177/0960327112456316] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Over the past decade, regulatory authorities and water purveyors have become increasingly concerned with accidental or intentional adulteration of municipal drinking water. Emergency response guidelines, such as the ‘Do Not Consume’ or use concentration limits derived herein, can be used to notify the public in such cases. Potassium permanganate (KMnO4) is used to control iron concentrations and to reduce the levels of nuisance materials that affect odor or taste of finished drinking water. Manganese (Mn) is recognized an essential nutrient, permanganate (MnO4−) and manganous (Mn+2) ions are caustic, and the acute toxicity of KMnO4 is defined by its oxidant/irritant properties and by the toxicity of Mn. Ingestion of small amounts (4–20 mg/kg) of aqueous KMnO4 solutions that are above 200 mg/L causes gastrointestinal distress, while bolus ingestion has caused respiratory arrest following coagulative necrosis and hemorrhage in the esophagus, stomach, or liver. Dilute KMnO4 solutions (1–100 mg/L) are used as a topical antiseptics and astringents, but >1:5000 (200 mg/L) dilutions can irritate or discolor sensitive mucous membranes and direct skin or ocular contact with concentrated KMnO4 can perforate tissues. Based on clinical experience with 200 mg/L KMnO4, a Do Not Consume concentration of 7 mg/L KMnO4 (equivalent to 2 mg Mn/L) is recommended. Recognizing limited empirical data from which to calculate an ocular reference value, a skin contact ‘Do Not Use’ concentration of 30 mg Mn/L is recommended based on the skin irritation in some patients after a 10-min contact with 100 mg KMnO4/L.
Collapse
Affiliation(s)
| | | | | | - CJ McLellan
- NSF International, Dixboro Road, Ann Arbor, Michigan, USA
| |
Collapse
|