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Tang M, Zhao Y, Zhai Y, Zhang Y, Liu Y, Liu T, Wu J, He L, Yao Y, Xue P, He M, Xu Y, Feng S, Qu W, Zhang Y. Mercury chloride activates the IFNγ-IRF1 signaling in myeloid progenitors and promotes monopoiesis in mice. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2023; 337:122583. [PMID: 37741541 DOI: 10.1016/j.envpol.2023.122583] [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: 06/09/2023] [Revised: 08/21/2023] [Accepted: 09/17/2023] [Indexed: 09/25/2023]
Abstract
Inorganic mercury (Hg2+) is a highly toxic heavy metal in the environment. To date, the impacts of Hg2+ on the development of monocytes, or monopoiesis, have not been fully addressed. The aim of the present study was to investigate the impact of Hg2+ on monopoiesis. In this study, we treated B10.S mice and DBA/2 mice with 10 μM or 50 μM HgCl2 via drinking water for 4 wk, and we then evaluated the development of monocytes. Treatment with 50 μM HgCl2, but not 10 μM HgCl2, increased the number of monocytes in the blood, spleen and bone marrow (BM) of B10.S mice. Accordingly, treatment with 50 μM HgCl2, but not 10 μM HgCl2, increased the number of common myeloid progenitors (CMP) and granulocyte-macrophage progenitors (GMP) in the BM. Functional analyses indicated that treatment with 50 μM HgCl2 promoted the differentiation of CMP and GMP to monocytes in the BM of B10.S mice. Mechanistically, treatment with 50 μM HgCl2 induced the production of IFNγ, which activated the Jak1/3-STAT1/3-IRF1 signaling in CMP and GMP and enhanced their differentiation potential for monocytes in the BM, thus likely leading to increased number of mature monocytes in B10.S mice. Moreover, the increased monopoiesis by Hg2+ was associated with the increased inflammatory status in B10.S mice. In contrast, treatment with 50 μM HgCl2 did not impact the monopoiesis in DBA/2 mice. Our study reveals the impact of Hg on the development of monocytes.
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Affiliation(s)
- Mengke Tang
- School of Public Health and Key Laboratory of Public Health Safety, MOE, Fudan University, Shanghai, 200032, China
| | - Yifan Zhao
- School of Public Health and Key Laboratory of Public Health Safety, MOE, Fudan University, Shanghai, 200032, China
| | - Yue Zhai
- School of Public Health and Key Laboratory of Public Health Safety, MOE, Fudan University, Shanghai, 200032, China
| | - Yufan Zhang
- School of Public Health and Key Laboratory of Public Health Safety, MOE, Fudan University, Shanghai, 200032, China
| | - Yalin Liu
- School of Public Health and Key Laboratory of Public Health Safety, MOE, Fudan University, Shanghai, 200032, China
| | - Ting Liu
- School of Public Health and Key Laboratory of Public Health Safety, MOE, Fudan University, Shanghai, 200032, China
| | - Jiaojiao Wu
- School of Public Health and Key Laboratory of Public Health Safety, MOE, Fudan University, Shanghai, 200032, China
| | - Leyi He
- China Medical University-The Queen's University of Belfast Joint College, China Medical University, Shenyang, 110121, China
| | - Ye Yao
- School of Public Health and Key Laboratory of Public Health Safety, MOE, Fudan University, Shanghai, 200032, China
| | - Peng Xue
- School of Public Health and Key Laboratory of Public Health Safety, MOE, Fudan University, Shanghai, 200032, China
| | - Miao He
- State Key Laboratory of Medical Neurobiology, Institutes of Brain Science, Fudan University, Shanghai, 200032, China
| | - Yanyi Xu
- School of Public Health and Key Laboratory of Public Health Safety, MOE, Fudan University, Shanghai, 200032, China
| | - Shaoqing Feng
- Department of Plastic and Reconstructive Surgery, Shanghai Ninth People's Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, 200011, China
| | - Weidong Qu
- School of Public Health and Key Laboratory of Public Health Safety, MOE, Fudan University, Shanghai, 200032, China
| | - Yubin Zhang
- School of Public Health and Key Laboratory of Public Health Safety, MOE, Fudan University, Shanghai, 200032, China.
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Mercury Chloride Affects Band 3 Protein-Mediated Anionic Transport in Red Blood Cells: Role of Oxidative Stress and Protective Effect of Olive Oil Polyphenols. Cells 2023; 12:cells12030424. [PMID: 36766766 PMCID: PMC9913727 DOI: 10.3390/cells12030424] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2022] [Revised: 01/19/2023] [Accepted: 01/25/2023] [Indexed: 01/31/2023] Open
Abstract
Mercury is a toxic heavy metal widely dispersed in the natural environment. Mercury exposure induces an increase in oxidative stress in red blood cells (RBCs) through the production of reactive species and alteration of the endogenous antioxidant defense system. Recently, among various natural antioxidants, the polyphenols from extra-virgin olive oil (EVOO), an important element of the Mediterranean diet, have generated growing interest. Here, we examined the potential protective effects of hydroxytyrosol (HT) and/or homovanillyl alcohol (HVA) on an oxidative stress model represented by human RBCs treated with HgCl2 (10 µM, 4 h of incubation). Morphological changes as well as markers of oxidative stress, including thiobarbituric acid reactive substance (TBARS) levels, the oxidation of protein sulfhydryl (-SH) groups, methemoglobin formation (% MetHb), apoptotic cells, a reduced glutathione/oxidized glutathione ratio, Band 3 protein (B3p) content, and anion exchange capability through B3p were analyzed in RBCs treated with HgCl2 with or without 10 μM HT and/or HVA pre-treatment for 15 min. Our data show that 10 µM HT and/or HVA pre-incubation impaired both acanthocytes formation, due to 10 µM HgCl2, and mercury-induced oxidative stress injury and, moreover, restored the endogenous antioxidant system. Interestingly, HgCl2 treatment was associated with a decrease in the rate constant for SO42- uptake through B3p as well as MetHb formation. Both alterations were attenuated by pre-treatment with HT and/or HVA. These findings provide mechanistic insights into benefits deriving from the use of naturally occurring polyphenols against oxidative stress induced by HgCl2 on RBCs. Thus, dietary supplementation with polyphenols might be useful in populations exposed to HgCl2 poisoning.
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Zhai Y, Zhao Y, Zhang Y, He J, Tang M, Liu Y, Yang G, Xue P, Yao Y, He M, Xu Y, Qu W, Zhang Y. Lead suppresses interferon γ to induce splenomegaly via modification on splenic endothelial cells and lymphoid tissue organizer cells in mice. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2022; 244:114046. [PMID: 36057201 DOI: 10.1016/j.ecoenv.2022.114046] [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: 05/08/2022] [Revised: 08/21/2022] [Accepted: 08/29/2022] [Indexed: 06/15/2023]
Abstract
Splenomegaly is a symptom characterized by the presence of an enlarged spleen. The impact of environmental factors on splenomegaly is largely unknown. In this study, C57BL/6 mice were treated with 125 ppm or 1250 ppm lead (Pb) via drinking water for 8 wk, and the process of splenomegaly was evaluated. Treatment with 1250 ppm Pb, but not 125 ppm Pb, caused splenomegaly, which was associated with increased capacity for erythrocyte clearance. Intriguingly, Pb-caused splenomegaly was independent of lymphoid tissue inducer (LTi) cells, which produce lymphotoxins α and β (LTα/β) to activate endothelial cells and LT organizer (LTo) cells and drive the development of spleen physiologically. A direct action of Pb on endothelial cells and LTo cells did not impact their proliferation. On the other hand, during steady state, a tonic level of interferon (IFN)γ acted on endothelial cells and LTo cells to suppress splenomegaly, as IFNγ receptor (IFNγR)-deficient mice had enlarged spleens relative to wild-type mice; during Pb exposure, splenic IFNγ production was suppressed, thus leading to a loss of the inhibitory effect of IFNγ on splenomegaly. Mechanically, Pb acted on splenic CD4+ T cells to suppress IFNγ production, which impaired the Janus kinase (Jak)1/ signal transducer and activator of transcription (STAT)1 signaling in endothelial cells and LTo cells; the weakened Jak1/STAT1 signaling resulted in the enhanced nuclear factor-κB (NF-κB) signaling in endothelial cells and LTo cells, which drove their proliferation and caused splenomegaly. The present study reveals a previously unrecognized mechanism for the immunotoxicity of Pb, which may extend our current understanding for Pb toxicology.
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Affiliation(s)
- Yue Zhai
- School of Public Health and Key Laboratory of Public Health Safety, Ministry of Education, Fudan University, Shanghai 200032, China
| | - Yifan Zhao
- School of Public Health and Key Laboratory of Public Health Safety, Ministry of Education, Fudan University, Shanghai 200032, China
| | - Yufan Zhang
- School of Public Health and Key Laboratory of Public Health Safety, Ministry of Education, Fudan University, Shanghai 200032, China
| | - Jinyi He
- School of Public Health and Key Laboratory of Public Health Safety, Ministry of Education, Fudan University, Shanghai 200032, China
| | - Mengke Tang
- School of Public Health and Key Laboratory of Public Health Safety, Ministry of Education, Fudan University, Shanghai 200032, China
| | - Yalin Liu
- School of Public Health and Key Laboratory of Public Health Safety, Ministry of Education, Fudan University, Shanghai 200032, China
| | - Guangrui Yang
- School of Public Health and Key Laboratory of Public Health Safety, Ministry of Education, Fudan University, Shanghai 200032, China
| | - Peng Xue
- School of Public Health and Key Laboratory of Public Health Safety, Ministry of Education, Fudan University, Shanghai 200032, China
| | - Ye Yao
- School of Public Health and Key Laboratory of Public Health Safety, Ministry of Education, Fudan University, Shanghai 200032, China
| | - Miao He
- State Key Laboratory of Medical Neurobiology, Institutes of Brain Science, Fudan University, Shanghai 200032, China
| | - Yanyi Xu
- School of Public Health and Key Laboratory of Public Health Safety, Ministry of Education, Fudan University, Shanghai 200032, China
| | - Weidong Qu
- School of Public Health and Key Laboratory of Public Health Safety, Ministry of Education, Fudan University, Shanghai 200032, China
| | - Yubin Zhang
- School of Public Health and Key Laboratory of Public Health Safety, Ministry of Education, Fudan University, Shanghai 200032, China.
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Güven D, Özbek İ. Characteristics, Treatment, and Prognosis of Elemental Mercury Intoxication in Children: A Single-Center Retrospective Study. Pediatr Emerg Care 2022; 38:481-488. [PMID: 36066601 DOI: 10.1097/pec.0000000000002834] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
OBJECTIVES Mercury exposure is common and can be toxic, especially in children. Children are often drawn to elemental mercury because of its density, color, and proclivity to form beads. METHODS We present data on 49 children with mercury intoxication (MI) and 60 children with mercury exposure from Turkey. RESULTS The most common source of mercury was broken thermometer in schools. Inhaling mercury vapor was the most common route of exposure. The median exposure time was 6 (6-16) hours in the MI group, and the time to 1st symptoms was 10 (0-24) hours. In the MI group, the median blood mercury level was 21 μg/L (13-32.3), the median spot urine mercury level was 40 μg/L (7.66-78), and the median 24-hour urine mercury level was 25.8 μg/L (11-64). The most common symptoms in patients with MI were malaise, muscle pain, muscle cramps, abdominal pain, nausea, headache, and decreased appetite. The patients were treated with n-acetyl cysteine, 2,3-dimercaptopropane sulfonic acid, D-penicillamine, and meso 2,3-dimercaptosuccinic acid. A positive correlation was found between exposure time and urinary mercury level in the MI group (r = 0.793, P < 0.001). A positive moderate correlation was found between exposure time and blood level in the mercury exposure group (r = 0.535, P < 0.00). The neurological and systemic examinations of patients were all normal at the 1st follow-up visit 1 month after discharge. CONCLUSIONS Diagnosis, removal of the exposure source, and use of chelation therapy can result in complete resolution of the signs and symptoms of MI.
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Affiliation(s)
- Deniz Güven
- From the Department of Pediatrics, University of Health Sciences, Ankara Atatürk Sanatorium Training and Research Hospital, Ankara, Turkey
| | - İmran Özbek
- Department of Pediatrics, Ankara Gazi Mustafa Kemal Occupational and Environmental Diseases Hospital, Ankara, Turkey
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