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Tazaki A, Nishadhi DASM, Li A, Zhang L, Maw TH, Kondo-Ida L, Yanagisawa K, Kato M. Progression from in vivo validation to in vitro screening in hazard assessment for leukoderma-inducible chemicals. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2024:124508. [PMID: 39089942 DOI: 10.1016/j.envpol.2024.124508] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2024] [Revised: 06/17/2024] [Accepted: 07/03/2024] [Indexed: 08/04/2024]
Abstract
Chemicals are representative environmental factors that affect human health. Recently, external exposure to a chemical of rhododenol (RD) caused chemical leukoderma, an acquired patchy hypopigmentation, in about 20,000 Asian people. The development of a hazard assessment system for accurate determination of leukoderma-inducible chemicals is required for the prevention of such tragedies. Case studies in humans have shown 6 chemicals, including RD, with a constitutive leukoderma-inducible potency and 3 chemicals with a photosensitive but not a constitutive leukoderma-inducible potency. In this study, the 6 positive and 3 negative control chemicals with or without constitutive leukoderma-inducible potencies were investigated by our previously developed in vivo hazard assessment system using tail skin of mice. Based on the results of validation, this study aimed to develop an in vitro hazard assessment system to correctly determine chemicals with a constitutive leukoderma-inducible potency. As expected, external exposure to the 6 positive control chemicals, but not external exposure to the 3 negative control chemicals, resulted in development of constitutive leukoderma in mouse tail skin with a decreased level of skin melanin and decreased number of melanocytes. Moreover, the 6 positive and 3 negative control chemicals were correctly distinguished by the presence or absence of endoplasmic reticulum (ER) stress induction, but not by tyrosinase-dependent cell death or production of reactive oxygen species (ROS), in immortalized normal melanocytes. The hazard assessment system using tail skin could be a solid in vivo tool to reliably determine the chemical potency of a chemical for constitutive leukoderma induction. The hazard assessment system focusing on ER stress induction in normal melanocytes might be a novel and convenient in vitro tool for accurately evaluating chemicals with leukoderma-inducible potencies. Thus, this study contributed to environmentology through the development of a screening system for preventing an environmental factor-related disease.
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Affiliation(s)
- Akira Tazaki
- Department of Occupational and Environmental Health, Nagoya University Graduate School of Medicine, Nagoya, Aichi, Japan; Activities of the Institute of Innovation for Future Society of Nagoya University, Japan; Voluntary Body for International Healthcare in Universities, Nagoya, Aichi, Japan
| | - Delgama A S M Nishadhi
- Department of Occupational and Environmental Health, Nagoya University Graduate School of Medicine, Nagoya, Aichi, Japan; Voluntary Body for International Healthcare in Universities, Nagoya, Aichi, Japan
| | - Ao Li
- Department of Occupational and Environmental Health, Nagoya University Graduate School of Medicine, Nagoya, Aichi, Japan; Voluntary Body for International Healthcare in Universities, Nagoya, Aichi, Japan
| | - Lanyue Zhang
- Department of Occupational and Environmental Health, Nagoya University Graduate School of Medicine, Nagoya, Aichi, Japan
| | - Than Htike Maw
- Department of Occupational and Environmental Health, Nagoya University Graduate School of Medicine, Nagoya, Aichi, Japan; Voluntary Body for International Healthcare in Universities, Nagoya, Aichi, Japan
| | - Lisa Kondo-Ida
- Department of Occupational and Environmental Health, Nagoya University Graduate School of Medicine, Nagoya, Aichi, Japan; Department of Molecular and Cancer Medicine, Faculty of Pharmacy, Meijo University, Nagoya, Japan
| | - Kiyoshi Yanagisawa
- Department of Molecular and Cancer Medicine, Faculty of Pharmacy, Meijo University, Nagoya, Japan
| | - Masashi Kato
- Department of Occupational and Environmental Health, Nagoya University Graduate School of Medicine, Nagoya, Aichi, Japan; Activities of the Institute of Innovation for Future Society of Nagoya University, Japan; Voluntary Body for International Healthcare in Universities, Nagoya, Aichi, Japan.
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Misawa T, Kagawa T, Ohgami N, Tazaki A, Ohnuma S, Naito H, Chen D, Gu Y, Tamura T, Wakai K, Nishiwaki K, Kato M. Elevated level of urinary tellurium is a potential risk for increase of blood pressure in humans and mice. ENVIRONMENT INTERNATIONAL 2024; 188:108735. [PMID: 38761428 DOI: 10.1016/j.envint.2024.108735] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2023] [Revised: 03/12/2024] [Accepted: 05/08/2024] [Indexed: 05/20/2024]
Abstract
BACKGROUND People worldwide are routinely exposed to tellurium mainly via dietary ingestion. There has been no study to clarify the contribution of tellurium to blood pressure in humans or animals. METHODS In this cross-sectional study conducted in a general population of 2592 residents in Japan, the associations of urinary tellurium levels with blood pressure and prevalence of hypertension were investigated. The potential sources of tellurium were also investigated. An interventional study in mice confirmed the effect of tellurium exposure on blood pressure. RESULTS Linear and logistic regression analyses with consideration of confounders including urinary sodium-potassium ratio showed significant positive associations of urinary tellurium level with prevalence of hypertension and blood pressure. Cereals/beans and vegetables/fruits were determined to be potential dietary sources of tellurium exposure. Intermediary analysis suggested that increased intake of cereals/beans, but not that of vegetables/fruits, is positively associated with the tellurium-mediated risk of hypertension. Correspondingly, the mouse study showed that exposure to a putative human-equivalent dose of tellurium via drinking water increased blood pressure with an elevated level of urinary tellurium. The temporally increased blood pressure was decreased to the normal level by a break of tellurium exposure with a reduced level of urinary tellurium. CONCLUSIONS The interdisciplinary approach provided the first evidence that tellurium exposure is a potential risk for increase of blood pressure. Since the human urinary tellurium level in this study is comparable with the levels in general populations in other Asian and European countries in previous studies, exposure to tellurium may be a latent universal risk for hypertension.
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Affiliation(s)
- Tomoko Misawa
- Department of Occupational and Environmental Health, Nagoya University Graduate School of Medicine, Nagoya, Aichi, Japan; Department of Anesthesiology, Nagoya University Graduate School of Medicine, Nagoya, Aichi, Japan
| | - Takumi Kagawa
- Department of Occupational and Environmental Health, Nagoya University Graduate School of Medicine, Nagoya, Aichi, Japan; Department of Voluntary Body for International Health Care in Universities, Nagoya, Aichi, Japan
| | - Nobutaka Ohgami
- Department of Occupational and Environmental Health, Nagoya University Graduate School of Medicine, Nagoya, Aichi, Japan; Department of Voluntary Body for International Health Care in Universities, Nagoya, Aichi, Japan; Department of Hygiene, Fujita Heath University School of Medicine, Toyoake, Aichi, Japan
| | - Akira Tazaki
- Department of Occupational and Environmental Health, Nagoya University Graduate School of Medicine, Nagoya, Aichi, Japan; Department of Voluntary Body for International Health Care in Universities, Nagoya, Aichi, Japan
| | - Shoko Ohnuma
- Department of Voluntary Body for International Health Care in Universities, Nagoya, Aichi, Japan
| | - Hisao Naito
- Department of Occupational and Environmental Health, Nagoya University Graduate School of Medicine, Nagoya, Aichi, Japan
| | - Dijie Chen
- Department of Occupational and Environmental Health, Nagoya University Graduate School of Medicine, Nagoya, Aichi, Japan; Department of Voluntary Body for International Health Care in Universities, Nagoya, Aichi, Japan
| | - Yishuo Gu
- Department of Occupational and Environmental Health, Nagoya University Graduate School of Medicine, Nagoya, Aichi, Japan; Department of Voluntary Body for International Health Care in Universities, Nagoya, Aichi, Japan
| | - Takashi Tamura
- Department of Preventive Medicine, Nagoya University Graduate School of Medicine, Nagoya, Aichi, Japan
| | - Kenji Wakai
- Department of Preventive Medicine, Nagoya University Graduate School of Medicine, Nagoya, Aichi, Japan
| | - Kimitoshi Nishiwaki
- Department of Anesthesiology, Nagoya University Graduate School of Medicine, Nagoya, Aichi, Japan
| | - Masashi Kato
- Department of Occupational and Environmental Health, Nagoya University Graduate School of Medicine, Nagoya, Aichi, Japan; Department of Voluntary Body for International Health Care in Universities, Nagoya, Aichi, Japan.
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Kurniasari F, Htike MT, Tazaki A, Kagawa T, Al Hossain MMA, Akhand AA, Ahsan N, Ohnuma S, Iwasaki N, Kato M. Beneficial and adverse effects of dam construction in canal tannery wastewater effluent with a high content of chromium in Hazaribagh, Bangladesh. CHEMOSPHERE 2024; 350:141047. [PMID: 38154667 DOI: 10.1016/j.chemosphere.2023.141047] [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: 11/07/2023] [Revised: 12/25/2023] [Accepted: 12/26/2023] [Indexed: 12/30/2023]
Abstract
BACKGROUND Blockage to divide downstream canals into upstream canals, into which tannery wastewater including a high concentration of trivalent chromium [Cr(III)] is directly discharged, has been constructed in Hazaribagh, a tannery built-up area in Bangladesh. However, there has been no study to verify the environmental significance of blockage construction for water pollution of Cr in nature. METHODS Consecutive fixed area monitoring for a total of 164 water samples collected outside and inside Hazaribagh from 2014 to 2023 was carried out to clarify the effects of stagnant and flowable canal water in the presence or absence of blockage on Cr(III) and hexavalent Cr [Cr(VI)] concentrations. RESULTS Since pollution of Cr(III) and Cr(VI) in Buriganga River (outside Hazaribagh) was not serious, this study then focused on their pollution in canal water (inside Hazaribagh) in the nonblockage period, blockage construction period and blockage destruction period. As expected, the mean Cr(III) concentration in downstream canal water samples in the blockage construction period was more than 98% lower than that in the upstream canal water samples in the same period, while the concentrations were comparable in downstream and upstream canal water samples in the nonblockage period and blockage destruction period. Unexpectedly, the mean concentration of Cr(VI) in the upstream canal water samples in the blockage construction period was 38.6-fold and 3.3-fold higher than that in the downstream canal water samples and the Cr(VI) guideline value by the US-EPA, respectively. CONCLUSION This study demonstrated for the first time not only a merit of decreased Cr(III) pollution but also a demerit of increased Cr(VI) pollution in stagnant water derived from blockage construction in natural environments. This bitter lesson obtained by the enclosure of Cr(III)-polluted water is globally applicable for water pollution of Cr(III), which is used in various industries including the leather industry.
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Affiliation(s)
- Fitri Kurniasari
- Department of Occupational and Environmental Health, Nagoya University Graduate School of Medicine, Nagoya, Aichi, Japan; Voluntary Body for International Healthcare in Universities, Nagoya, Aichi, Japan; Department of Environmental Health, Faculty of Public Health, University of Indonesia, Depok, West Java, Indonesia
| | - Maw Than Htike
- Department of Occupational and Environmental Health, Nagoya University Graduate School of Medicine, Nagoya, Aichi, Japan; Voluntary Body for International Healthcare in Universities, Nagoya, Aichi, Japan
| | - Akira Tazaki
- Department of Occupational and Environmental Health, Nagoya University Graduate School of Medicine, Nagoya, Aichi, Japan; Voluntary Body for International Healthcare in Universities, Nagoya, Aichi, Japan
| | - Takumi Kagawa
- Department of Occupational and Environmental Health, Nagoya University Graduate School of Medicine, Nagoya, Aichi, Japan; Voluntary Body for International Healthcare in Universities, Nagoya, Aichi, Japan
| | - M M Aeorangajeb Al Hossain
- Department of Occupational and Environmental Health, Nagoya University Graduate School of Medicine, Nagoya, Aichi, Japan; Voluntary Body for International Healthcare in Universities, Nagoya, Aichi, Japan; Directorate General of Health Services, Ministry of Health and Family Welfare, Government of the People's Republic of Bangladesh, Mohakhali, Dhaka, 1212, Bangladesh
| | - Anwarul Azim Akhand
- Voluntary Body for International Healthcare in Universities, Nagoya, Aichi, Japan; Department of Genetic Engineering and Biotechnology, University of Dhaka, Dhaka, 1000, Bangladesh
| | - Nazmul Ahsan
- Voluntary Body for International Healthcare in Universities, Nagoya, Aichi, Japan; Department of Genetic Engineering and Biotechnology, University of Dhaka, Dhaka, 1000, Bangladesh
| | - Shoko Ohnuma
- Voluntary Body for International Healthcare in Universities, Nagoya, Aichi, Japan
| | - Naruhito Iwasaki
- Department of Occupational and Environmental Health, Nagoya University Graduate School of Medicine, Nagoya, Aichi, Japan; Voluntary Body for International Healthcare in Universities, Nagoya, Aichi, Japan
| | - Masashi Kato
- Department of Occupational and Environmental Health, Nagoya University Graduate School of Medicine, Nagoya, Aichi, Japan; Voluntary Body for International Healthcare in Universities, Nagoya, Aichi, Japan; Units of Environmental Health Sciences, Department of Biomedical Sciences, College of Life and Health Sciences, Chubu University, Kasugai, Aichi, Japan.
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Kagawa T, Ohgami N, He T, Tazaki A, Ohnuma S, Naito H, Yajima I, Chen D, Deng Y, Tamura T, Kondo T, Wakai K, Kato M. Elevated arsenic level in fasting serum via ingestion of fish meat increased the risk of hypertension in humans and mice. EUROPEAN HEART JOURNAL OPEN 2023; 3:oead074. [PMID: 37671121 PMCID: PMC10475452 DOI: 10.1093/ehjopen/oead074] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2023] [Revised: 07/18/2023] [Accepted: 08/01/2023] [Indexed: 09/07/2023]
Abstract
Aims There has been a shortage of human studies to elucidate the association between serum arsenic levels and the prevalence of hypertension. This study multidirectionally investigated associations among arsenic exposure, dietary ingestion, and the risk of hypertension by combined human epidemiological and mouse experimental studies. Methods and results This study focused on the total arsenic level in fasting serum, a biomarker of arsenic exposure. Associations among ingestion frequencies of 54 diet items of Japanese food separated into six categories, total arsenic level in fasting serum, and the prevalence of hypertension were investigated in 2709 general people in Japan. Logistic regression analysis demonstrated a dose-dependent association between serum arsenic level and hypertension and a positive association between the ingestion of fish meat and hypertension. Further analysis showed that the latter association was fully mediated by increased fasting serum arsenic levels in humans. Similarly, oral exposure to the putative human-equivalent dose of arsenic species mixture with the same ratios in a common fish meat in Japan increased systolic blood pressure and arsenic levels in fasting serum in mice. Conclusion This interdisciplinary approach suggests that fish-meat ingestion is a potential risk factor for arsenic-mediated hypertension. Because the increased consumption of fish meat is a recent global trend, health risks of the increased ingestion of arsenic via fish meat should be further investigated.
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Affiliation(s)
- Takumi Kagawa
- Department of Occupational and Environmental Health, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, Aichi 466-8550, Japan
- Voluntary Body for International Health Care in Universities, 65 Tsurumai-cho, Showa-ku, Nagoya, Aichi 466-8550, Japan
| | - Nobutaka Ohgami
- Department of Occupational and Environmental Health, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, Aichi 466-8550, Japan
- Voluntary Body for International Health Care in Universities, 65 Tsurumai-cho, Showa-ku, Nagoya, Aichi 466-8550, Japan
- Department of Hygiene, School of Medicine, Fujita Health University, 1-98 Dengakugakubo, Kutsukake-cho, Toyoake, Aichi 470–1192, Japan
| | - Tingchao He
- Department of Occupational and Environmental Health, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, Aichi 466-8550, Japan
- Voluntary Body for International Health Care in Universities, 65 Tsurumai-cho, Showa-ku, Nagoya, Aichi 466-8550, Japan
- Department of Hygiene, School of Medicine, Fujita Health University, 1-98 Dengakugakubo, Kutsukake-cho, Toyoake, Aichi 470–1192, Japan
| | - Akira Tazaki
- Department of Occupational and Environmental Health, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, Aichi 466-8550, Japan
- Voluntary Body for International Health Care in Universities, 65 Tsurumai-cho, Showa-ku, Nagoya, Aichi 466-8550, Japan
| | - Shoko Ohnuma
- Voluntary Body for International Health Care in Universities, 65 Tsurumai-cho, Showa-ku, Nagoya, Aichi 466-8550, Japan
| | - Hisao Naito
- Department of Occupational and Environmental Health, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, Aichi 466-8550, Japan
| | - Ichiro Yajima
- Department of Occupational and Environmental Health, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, Aichi 466-8550, Japan
- Voluntary Body for International Health Care in Universities, 65 Tsurumai-cho, Showa-ku, Nagoya, Aichi 466-8550, Japan
| | - Dijie Chen
- Department of Occupational and Environmental Health, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, Aichi 466-8550, Japan
- Voluntary Body for International Health Care in Universities, 65 Tsurumai-cho, Showa-ku, Nagoya, Aichi 466-8550, Japan
| | - Yuqi Deng
- Department of Occupational and Environmental Health, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, Aichi 466-8550, Japan
- Voluntary Body for International Health Care in Universities, 65 Tsurumai-cho, Showa-ku, Nagoya, Aichi 466-8550, Japan
- Department of Hygiene, School of Medicine, Fujita Health University, 1-98 Dengakugakubo, Kutsukake-cho, Toyoake, Aichi 470–1192, Japan
| | - Takashi Tamura
- Department of Preventive Medicine, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, Aichi 466-8550, Japan
| | - Takaaki Kondo
- Department of Pathophysiological Laboratory Sciences, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, Aichi 466-8550, Japan
| | - Kenji Wakai
- Department of Preventive Medicine, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, Aichi 466-8550, Japan
| | - Masashi Kato
- Department of Occupational and Environmental Health, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, Aichi 466-8550, Japan
- Voluntary Body for International Health Care in Universities, 65 Tsurumai-cho, Showa-ku, Nagoya, Aichi 466-8550, Japan
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