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Wu X, Jeong CB, Huang W, Ip JCH, Guo J, Lai KP, Liu W, Mo J. Environmental occurrence, biological effects, and health implications of zinc pyrithione: A review. MARINE POLLUTION BULLETIN 2024; 203:116466. [PMID: 38713926 DOI: 10.1016/j.marpolbul.2024.116466] [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: 02/17/2024] [Revised: 04/19/2024] [Accepted: 05/03/2024] [Indexed: 05/09/2024]
Abstract
Due to the detrimental effects on aquatic organisms and ecosystem, tributyltin as a antifouling agent have been banned worldwide since 1990s. As a replacement for tributyltin, zinc pyrithione (ZnPT) has emerged as a new environmentally friendly antifouling agent. However, the widespread use of ZnPT unavoidably leads to the occurrence and accumulation in aquatic environments, especially in waters with limited sunlight. Despite empirical evidence demonstrating the ecotoxicity and health risks of ZnPT to different organisms, there has been no attempt to compile and interpret this data. The present review revealed that over the past 50 years, numerous studies have documented the toxicity of ZnPT in various organisms, both in vitro and in vivo. However, long-term effects and underlying mechanisms of ZnPT on biota, particularly at environmentally realistic exposure levels, remain largely unexplored. In-depth studies are thus necessary to generate detailed ecotoxicological information of ZnPT for environmental risk assessment and management.
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Affiliation(s)
- Xintong Wu
- Guangdong Provincial Key Laboratory of Marine Disaster Prediction and Prevention, Shantou University, Shantou 515063, China
| | - Chang-Bum Jeong
- Department of Marine Science, Incheon National University, Incheon 22012, South Korea
| | - Wenlong Huang
- Department of Forensic Medicine, Shantou University Medical College, Shantou 515041, Guangdong, China
| | | | - Jiahua Guo
- Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity, College of Urban and Environmental Sciences, Northwest University, Xi'an 710127, China
| | - Keng Po Lai
- Key Laboratory of Environmental Pollution and Integrative Omics, Guilin Medical University, Education Department of Guangxi Zhuang Autonomous Region, Guilin 541004, China
| | - Wenhua Liu
- Guangdong Provincial Key Laboratory of Marine Disaster Prediction and Prevention, Shantou University, Shantou 515063, China
| | - Jiezhang Mo
- Guangdong Provincial Key Laboratory of Marine Disaster Prediction and Prevention, Shantou University, Shantou 515063, China.
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2
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Bahader GA, James AW, Almarghalani DA, Shah ZA. Cofilin Inhibitor Protects against Traumatic Brain Injury-Induced Oxidative Stress and Neuroinflammation. BIOLOGY 2023; 12:630. [PMID: 37106830 PMCID: PMC10136258 DOI: 10.3390/biology12040630] [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: 03/01/2023] [Revised: 04/04/2023] [Accepted: 04/15/2023] [Indexed: 04/29/2023]
Abstract
Microglial activation and failure of the antioxidant defense mechanisms are major hallmarks in different brain injuries, particularly traumatic brain injury (TBI). Cofilin is a cytoskeleton-associated protein involved in actin binding and severing. In our previous studies, we identified the putative role of cofilin in mediating microglial activation and apoptosis in ischemic and hemorrhagic conditions. Others have highlighted the involvement of cofilin in ROS production and the resultant neuronal death; however, more studies are needed to delineate the role of cofilin in oxidative stress conditions. The present study aims to investigate the cellular and molecular effects of cofilin in TBI using both in vitro and in vivo models as well as the first-in-class small-molecule cofilin inhibitor (CI). An in vitro H2O2-induced oxidative stress model was used in two different types of cells, human neuroblastoma (SH-SY5Y) and microglia (HMC3), along with an in vivo controlled cortical impact model of TBI. Our results show that treatment with H2O2 increases the expression of cofilin and slingshot-1 (SSH-1), an upstream regulator of cofilin, in microglial cells, which was significantly reduced in the CI-treated group. Cofilin inhibition significantly attenuated H2O2-induced microglial activation by reducing the release of proinflammatory mediators. Furthermore, we demonstrate that CI protects against H2O2-induced ROS accumulation and neuronal cytotoxicity, activates the AKT signaling pathway by increasing its phosphorylation, and modulates mitochondrial-related apoptogenic factors. The expression of NF-E2-related factor 2 (Nrf2) and its associated antioxidant enzymes were also increased in CI-treated SY-SY5Y. In the mice model of TBI, CI significantly activated the Nrf2 and reduced the expression of oxidative/nitrosative stress markers at the protein and gene levels. Together, our data suggest that cofilin inhibition provides a neuroprotective effect in in vitro and in vivo TBI mice models by inhibiting oxidative stress and inflammatory responses, the pivotal mechanisms involved in TBI-induced brain damage.
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Affiliation(s)
- Ghaith A. Bahader
- Department of Medicinal and Biological Chemistry, The University of Toledo, 3000 Arlington Avenue, Toledo, OH 43614, USA
| | - Antonisamy William James
- Department of Medicinal and Biological Chemistry, The University of Toledo, 3000 Arlington Avenue, Toledo, OH 43614, USA
| | - Daniyah A. Almarghalani
- Department of Pharmacology and Experimental Therapeutics, College of Pharmacy and Pharmaceutical Sciences, The University of Toledo, Toledo, OH 43614, USA
| | - Zahoor A. Shah
- Department of Medicinal and Biological Chemistry, The University of Toledo, 3000 Arlington Avenue, Toledo, OH 43614, USA
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Kavitha A, Doss A, Praveen Pole R, Pushpa Rani TK, Prasad R, Satheesh S. A mini review on plant-mediated zinc oxide nanoparticles and their antibacterial potency. BIOCATALYSIS AND AGRICULTURAL BIOTECHNOLOGY 2023. [DOI: 10.1016/j.bcab.2023.102654] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
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Jamal M, Tsukamoto I, Maki T, Takei S, Konishi R, Kinoshita H. COA-Cl Evokes Protective Responses Against H 2O 2-and 6-OHDA-Induced Toxic Injury in PC12 Cells. Neurotox Res 2022; 40:2061-2071. [PMID: 36435924 DOI: 10.1007/s12640-022-00587-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2022] [Revised: 09/22/2022] [Accepted: 10/08/2022] [Indexed: 11/27/2022]
Abstract
COA-Cl, a novel adenosine-like nucleic acid analog, has recently been shown to exert neuroprotective effects and to increase dopamine levels both in vivo and in vitro. Therefore, we hypothesized that COA-Cl could protect dopaminergic neurons against toxic insults. Thus, the present study aimed to investigate the protective effects of COA-Cl against hydrogen peroxide (H2O2)- and 6-hydroxydopamine (6-OHDA)-induced toxicity in PC12 cells and to elucidate the possible mechanisms. PC12 cells were incubated with COA-Cl (100 μM) with or without H2O2 or 6-OHDA (200 μM) for 24 h. Treatment with COA-Cl attenuated the decrease in cell viability, SOD activity and the Bcl-2/Bax ratio caused by H2O2. In addition, COA-Cl attenuated the increase in LDH release, ROS production, caspase-3 activity, and apoptosis induced by H2O2. Further, COA-Cl enhanced the protection of PC12 cells against the toxicity caused by 6-OHDA, as evidenced by an increase in cell viability and the Bcl-2/Bax ratio, and a decrease in LDH release. Our results are the first to demonstrate that COA-Cl potentially protects PC12 cells against toxicity induced by H2O2 and 6-OHDA, implying that COA-Cl could be a promising neuroprotective agent for the treatment of Parkinson's disease.
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Affiliation(s)
- Mostofa Jamal
- Department of Forensic Medicine, Faculty of Medicine, Kagawa University, 1750-1, Ikenobe, Miki, Kita, Kagawa, 761-0793, Japan.
| | - Ikuko Tsukamoto
- Department of Pharmaco-Bio-Informatics, Faculty of Medicine, Kagawa University, Kagawa, Japan
| | - Takata Maki
- Department of Pharmaco-Bio-Informatics, Faculty of Medicine, Kagawa University, Kagawa, Japan
| | - Sella Takei
- Department of Forensic Medicine, Faculty of Medicine, Kagawa University, 1750-1, Ikenobe, Miki, Kita, Kagawa, 761-0793, Japan
| | - Ryoji Konishi
- Department of Pharmaco-Bio-Informatics, Faculty of Medicine, Kagawa University, Kagawa, Japan
| | - Hiroshi Kinoshita
- Department of Forensic Medicine, Faculty of Medicine, Kagawa University, 1750-1, Ikenobe, Miki, Kita, Kagawa, 761-0793, Japan
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Marques Dos Santos M, Tan Pei Fei M, Li C, Jia S, Snyder SA. Cell-line and culture model specific responses to organic contaminants in house dust: Cell bioenergetics, oxidative stress, and inflammation endpoints. ENVIRONMENT INTERNATIONAL 2022; 167:107403. [PMID: 35863240 DOI: 10.1016/j.envint.2022.107403] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2022] [Revised: 07/05/2022] [Accepted: 07/07/2022] [Indexed: 06/15/2023]
Abstract
Exposure to organic contaminants in house dust is linked to the development or exacerbation of many allergic and immune disorders. In this work, we evaluate the effects of organic contaminants on different cell bioenergetics endpoints using five different cell lines (16HBE14o-, NuLi-1, A549, THP-1 and HepG2), and examine its effects on lung epithelial cells using conventional 2D and 3D (air-liquid interface/ALI) models. Proposed rapid bioenergetic assays relies on a quick, 40 min, exposure protocol that provides equivalent dose-response curves for ATP production, spare respiratory capacity, and cell respiration. Although cell-line differences play an important role in assay performance, established EC50 concentrations for immortalized lung epithelial cells ranged from 0.11 to 0.15 mg/mL (∼2 µg of dust in a 96-well microplate format). Bioenergetic response of distinct cell types (i.e., monocytes and hepatocytes) was significantly different from epithelial cells; with HepG2 showing metabolic activity that might adversely affect results in 24 h exposure experiments. Like in cell bioenergetics, cell barrier function assay in ALI showed a dose dependent response. Although this is a physiologically relevant model, measurements are not as sensitivity as cytokine profiling and reactive oxygen species (ROS) assays. Observed effects are not solely explained by exposure to individual contaminants, this suggests that many causal agents responsible for adverse effects are still unknown. While 16HBE14o- cells show batter barrier formation characteristics, NuLi-1 cells are more sensitivity to oxidative stress induction even at low house dust extract concentrations, (NuLi-1 2.11-fold-change vs. 16HBE14o- 1.36-fold change) at 0.06 µg/mL. Results show that immortalized cell lines can be a suitable alternative to primary cells or other testing models, especially in the development of high-throughput assays. Observed cell line specific responses with different biomarker also highlights the importance of careful in-vitro model selection and potential drawbacks in risk assessment studies.
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Affiliation(s)
- Mauricius Marques Dos Santos
- Nanyang Environment & Water Research Institute (NEWRI), Nanyang Technological University, 1 Cleantech Loop, CleanTech One, #06-08, 637141, Singapore; Department of Chemical & Environmental Engineering, University of Arizona, 1133 E James E Rogers Way, Harshbarger 108, Tucson, AZ 85721-0011, USA
| | - Megan Tan Pei Fei
- School of Civil and Environmental Engineering, Nanyang Technological University, Singapore 639798, Singapore
| | - Caixia Li
- Nanyang Environment & Water Research Institute (NEWRI), Nanyang Technological University, 1 Cleantech Loop, CleanTech One, #06-08, 637141, Singapore
| | - Shenglan Jia
- Nanyang Environment & Water Research Institute (NEWRI), Nanyang Technological University, 1 Cleantech Loop, CleanTech One, #06-08, 637141, Singapore
| | - Shane Allen Snyder
- Nanyang Environment & Water Research Institute (NEWRI), Nanyang Technological University, 1 Cleantech Loop, CleanTech One, #06-08, 637141, Singapore; School of Civil and Environmental Engineering, Nanyang Technological University, Singapore 639798, Singapore.
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6
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Gong S, Zheng Z, Guan X, Feng S, Feng G. Near-Infrared Mitochondria-Targetable Fluorescent Probe for High-Contrast Bioimaging of H2S. Anal Chem 2021; 93:5700-5708. [DOI: 10.1021/acs.analchem.0c04639] [Citation(s) in RCA: 58] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Shengyi Gong
- Key Laboratory of Pesticide and Chemical Biology of Ministry of Education, College of Chemistry, Central China Normal University, 152 Luoyu Road, Wuhan 430079, P. R. China
| | - Zhoupeng Zheng
- Key Laboratory of Pesticide and Chemical Biology of Ministry of Education, College of Chemistry, Central China Normal University, 152 Luoyu Road, Wuhan 430079, P. R. China
| | - Xiaogang Guan
- Key Laboratory of Pesticide and Chemical Biology of Ministry of Education, College of Chemistry, Central China Normal University, 152 Luoyu Road, Wuhan 430079, P. R. China
| | - Shumin Feng
- Key Laboratory of Pesticide and Chemical Biology of Ministry of Education, College of Chemistry, Central China Normal University, 152 Luoyu Road, Wuhan 430079, P. R. China
| | - Guoqiang Feng
- Key Laboratory of Pesticide and Chemical Biology of Ministry of Education, College of Chemistry, Central China Normal University, 152 Luoyu Road, Wuhan 430079, P. R. China
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The Effects of Different Fluorescent Indicators in Observing the Changes of the Mitochondrial Membrane Potential during Oxidative Stress-Induced Mitochondrial Injury of Cardiac H9c2 Cells. J Fluoresc 2020; 30:1421-1430. [PMID: 32935195 DOI: 10.1007/s10895-020-02623-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Accepted: 09/09/2020] [Indexed: 12/15/2022]
Abstract
We evaluated the ability of different fluorescent indicators by various analytical instruments, including a laser scanning confocal microscope (LSCM), fluorescence plate reader, and flow cytometer (FCM), to measure the mitochondrial membrane potential (ΔΨm) of cardiac H9c2 cells during oxidative stress-induced mitochondrial injury. The mitochondrial oxygen consumption rate and a transmission electron microscope were used to detect changes in mitochondrial functions and morphology, respectively. Cardiac H9c2 cells were exposed to H2O2 (500, 750, 1000, and 1250 μM) to induce mitochondrial oxidative stress injury, and fluorescent indicators including tetramethyl rhodamine ethyl ester (TMRE), 5,5',6,6'-tetrachloro-1,1',3,3'-tetraethylbenzimidazolocarbocyanine iodide (JC-1), and rhodamine 123 (R123) were used to detect changes in ΔΨm using an LSCM, fluorescence plate reader, and FCM. The decrease in ΔΨm caused by H2O2 was determined by endpoint and dynamic analyses after staining with JC-1 or TMRE. With the R123 probe, the LSCM could only detect the change in ΔΨm caused by 1000 μM H2O2. Moreover, R123 was less effective than JC-1 and TMRE for measurement of ΔΨm by the LSCM. Our data indicated that an LSCM is the most suitable instrument to detect dynamic changes in ΔΨm, whereas all three instruments can detect ΔΨm at the endpoint.
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Samet JM, Chen H, Pennington ER, Bromberg PA. Non-redox cycling mechanisms of oxidative stress induced by PM metals. Free Radic Biol Med 2020; 151:26-37. [PMID: 31877355 PMCID: PMC7803379 DOI: 10.1016/j.freeradbiomed.2019.12.027] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/28/2019] [Revised: 12/13/2019] [Accepted: 12/20/2019] [Indexed: 12/27/2022]
Abstract
Metallic compounds contribute to the oxidative stress of ambient particulate matter (PM) exposure. The toxicity of redox inert ions of cadmium, mercury, lead and zinc, as well as redox-active ions of vanadium and chromium is underlain by dysregulation of mitochondrial function and loss of signaling quiescence. Central to the initiation of these effects is the interaction of metal ions with cysteinyl thiols on glutathione and key regulatory proteins, which leads to impaired mitochondrial electron transport and persistent pan-activation of signal transduction pathways. The mitochondrial and signaling effects are linked by the production of H2O2, generated from mitochondrial superoxide anion or through the activation of NADPH oxidase, which extends the range and amplifies the magnitude of the oxidative effects of the metals. This oxidative burden can be further potentiated by inhibitory effects of the metals on the enzymes of the glutathione and thioredoxin systems. Along with the better-known Fenton-based mechanisms, the non-redox cycling mechanisms of oxidative stress induced by metals constitute significant pathways for cellular injury induced by PM inhalation.
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Affiliation(s)
- James M Samet
- Environmental Public Health Division, Center for Public Health and Environmental Assessment, U.S. Environmental Protection Agency, Chapel Hill, NC, USA.
| | - Hao Chen
- Oak Ridge Institute for Science and Education, Oak Ridge, TN, USA
| | | | - Philip A Bromberg
- Center for Environmental Medicine, Asthma and Lung Biology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
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Huang B, Liu J, Fu S, Zhang Y, Li Y, He D, Ran X, Yan X, Du J, Meng T, Gao X, Liu D. α-Cyperone Attenuates H 2O 2-Induced Oxidative Stress and Apoptosis in SH-SY5Y Cells via Activation of Nrf2. Front Pharmacol 2020; 11:281. [PMID: 32322198 PMCID: PMC7156596 DOI: 10.3389/fphar.2020.00281] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2019] [Accepted: 02/27/2020] [Indexed: 01/04/2023] Open
Abstract
α-Cyperone, extracted from Cyperus rotundus, has been reported to inhibit microglia-mediated neuroinflammation. Oxidative stress and apoptosis play crucial roles in the course of Parkinson’s disease (PD). PD is a common neurodegenerative disease characterized by selective death of dopaminergic neurons. This study was designed to investigate the neuroprotective effects of α-cyperone against hydrogen peroxide (H2O2)-induced oxidative stress and apoptosis in dopaminergic neuronal SH-SY5Y cells. Neurotoxicity was assessed by MTT assay and the measurement of lactic dehydrogenase (LDH) release. The level of reactive oxygen species (ROS) was measured by dichlorodihydrofluorescin diacetate (DCFH-DA) staining. The apoptosis of SH-SY5Y cells was evaluated by annexin-V-FITC staining. The translocation of NF-E2-related factor 2 (Nrf2) was determined by western blot and immunofluorescence staining. Western blot analysis was conducted to determine the expression level of cleaved-caspase-3, the pro-apoptotic factor Bax, and the anti-apoptotic factor, Bcl-2. The results showed that α-cyperone substantially decreased H2O2-induced death, release of LDH, and the production of ROS in SH-SY5Y cells. In addition, we found that α-cyperone attenuated H2O2-induced cellular apoptosis. Moreover, α-cyperone remarkably reduced the expression of cleaved-caspase-3 and Bax, and upregulated Bcl-2. Furthermore, α-cyperone enhanced the nuclear translocation of Nrf2. Pretreatment with brusatol (BT, an Nrf2 inhibitor) attenuated α-cyperone-mediated suppression of ROS, cleaved-caspase-3, and Bax, as well as α-cyperone-induced Bcl-2 upregulation in H2O2-treated SH-SY5Y cells. α-cyperone neuroprotection required Nrf2 activation. In conclusion, α-cyperone attenuated H2O2-induced oxidative stress and apoptosis in SH-SY5Y cells via the activation of Nrf2, suggesting the potential of this compound in the prevention and treatment of PD.
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Affiliation(s)
- Bingxu Huang
- Department of Basic Veterinary Medicine, College of Animal Science and Veterinary Medicine, Jilin University, Changchun, China
| | - Juxiong Liu
- Department of Basic Veterinary Medicine, College of Animal Science and Veterinary Medicine, Jilin University, Changchun, China
| | - Shoupeng Fu
- Department of Basic Veterinary Medicine, College of Animal Science and Veterinary Medicine, Jilin University, Changchun, China
| | - Yufei Zhang
- Department of Basic Veterinary Medicine, College of Animal Science and Veterinary Medicine, Jilin University, Changchun, China
| | - Yuhang Li
- Department of Basic Veterinary Medicine, College of Animal Science and Veterinary Medicine, Jilin University, Changchun, China
| | - Dewei He
- Department of Basic Veterinary Medicine, College of Animal Science and Veterinary Medicine, Jilin University, Changchun, China
| | - Xin Ran
- Department of Basic Veterinary Medicine, College of Animal Science and Veterinary Medicine, Jilin University, Changchun, China
| | - Xuan Yan
- Department of Basic Veterinary Medicine, College of Animal Science and Veterinary Medicine, Jilin University, Changchun, China
| | - Jian Du
- Department of Basic Veterinary Medicine, College of Animal Science and Veterinary Medicine, Jilin University, Changchun, China
| | - Tianyu Meng
- Department of Food Quality and Safety, College of Food Science and Engineering, Jilin University, Changchun, China
| | - Xiyu Gao
- Department of Basic Veterinary Medicine, College of Animal Science and Veterinary Medicine, Jilin University, Changchun, China
| | - Dianfeng Liu
- Department of Basic Veterinary Medicine, College of Animal Science and Veterinary Medicine, Jilin University, Changchun, China
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Fang Y, Zhang X, Lu C, Yin Y, Hu X, Xu W, Liu Y, Wang H. Cytosolic mtDNA released from pneumolysin-damaged mitochondria triggers IFN-β production in epithelial cells. Can J Microbiol 2020; 66:435-445. [PMID: 32191844 DOI: 10.1139/cjm-2019-0481] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Pneumolysin (Ply) is a major virulence factor of Streptococcus pneumoniae. Ply-induced interferon-β (IFN-β) expression in host macrophages has been shown to be due to the accumulation of mitochondrial deoxyribonucleic acid (mtDNA) in the cytoplasm during S. pneumoniae infection. Our findings extend this work to show human bronchial epithelial cells that reside at the interface of inflammatory injury, BEAS-2B, adapt to local cues by altering mitochondrial states and releasing excess mtDNA. The results in this research showed that purified Ply induced the expression of IFN-β in human epithelial cells, which was accompanied by mitochondrial damage both in vivo and in vitro. The observations also were supported by the increased mtDNA concentrations in the bronchial lavage fluid of mice infected with S. pneumoniae. In summary, our study demonstrated that Ply triggered the production of IFN-β in epithelial cells, and this response was mediated by mtDNA released from Ply-damaged mitochondria. It displayed an impressive modulation of IFN-β response to S. pneumoniae in epithelial cells.
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Affiliation(s)
- Yuting Fang
- School of Laboratory Medicine, Key Laboratory of Diagnostic Medicine Designated by the Ministry of Education, Chongqing Medical University, Chongqing 400016, People's Republic of China
| | - Xuemei Zhang
- School of Laboratory Medicine, Key Laboratory of Diagnostic Medicine Designated by the Ministry of Education, Chongqing Medical University, Chongqing 400016, People's Republic of China
| | - Chang Lu
- School of Laboratory Medicine, Key Laboratory of Diagnostic Medicine Designated by the Ministry of Education, Chongqing Medical University, Chongqing 400016, People's Republic of China
| | - Yibing Yin
- School of Laboratory Medicine, Key Laboratory of Diagnostic Medicine Designated by the Ministry of Education, Chongqing Medical University, Chongqing 400016, People's Republic of China
| | - Xuexue Hu
- School of Laboratory Medicine, Key Laboratory of Diagnostic Medicine Designated by the Ministry of Education, Chongqing Medical University, Chongqing 400016, People's Republic of China
| | - Wenchun Xu
- School of Laboratory Medicine, Key Laboratory of Diagnostic Medicine Designated by the Ministry of Education, Chongqing Medical University, Chongqing 400016, People's Republic of China
| | - Yusi Liu
- Department of Laboratory Medicine, The First Affiliated Hospital of China Medical University, Shenyang 110001, People's Republic of China
| | - Hong Wang
- School of Laboratory Medicine, Key Laboratory of Diagnostic Medicine Designated by the Ministry of Education, Chongqing Medical University, Chongqing 400016, People's Republic of China
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Metabolomics Reveals that Cysteine Metabolism Plays a Role in Celastrol-Induced Mitochondrial Apoptosis in HL-60 and NB-4 Cells. Sci Rep 2020; 10:471. [PMID: 31949255 PMCID: PMC6965619 DOI: 10.1038/s41598-019-57312-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2019] [Accepted: 12/28/2019] [Indexed: 12/24/2022] Open
Abstract
Recently, celastrol has shown great potential for inducing apoptosis in acute myeloid leukemia cells, especially acute promyelocytic leukaemia cells. However, the mechanism is poorly understood. Metabolomics provides an overall understanding of metabolic mechanisms to illustrate celastrol's mechanism of action. We treated both nude mice bearing HL-60 cell xenografts in vivo and HL-60 cells as well as NB-4 cells in vitro with celastrol. Ultra-performance liquid chromatography coupled with mass spectrometry was used for metabolomics analysis of HL-60 cells in vivo and for targeted L-cysteine analysis in HL-60 and NB-4 cells in vitro. Flow cytometric analysis was performed to assess mitochondrial membrane potential, reactive oxygen species and apoptosis. Western blotting was conducted to detect the p53, Bax, cleaved caspase 9 and cleaved caspase 3 proteins. Celastrol inhibited tumour growth, induced apoptosis, and upregulated pro-apoptotic proteins in the xenograft tumour mouse model. Metabolomics showed that cysteine metabolism was the key metabolic alteration after celastrol treatment in HL-60 cells in vivo. Celastrol decreased L-cysteine in HL-60 cells. Acetylcysteine supplementation reversed reactive oxygen species accumulation and apoptosis induced by celastrol and reversed the dramatic decrease in the mitochondrial membrane potential and upregulation of pro-apoptotic proteins in HL-60 cells. In NB-4 cells, celastrol decreased L-cysteine, and acetylcysteine reversed celastrol-induced reactive oxygen species accumulation and apoptosis. We are the first to identify the involvement of a cysteine metabolism/reactive oxygen species/p53/Bax/caspase 9/caspase 3 pathway in celastrol-triggered mitochondrial apoptosis in HL-60 and NB-4 cells, providing a novel underlying mechanism through which celastrol could be used to treat acute myeloid leukaemia, especially acute promyelocytic leukaemia.
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Hu X, Peng X, Lu C, Zhang X, Gan L, Gao Y, Yang S, Xu W, Wang J, Yin Y, Wang H. Type I
IFN
expression is stimulated by cytosolic Mt
DNA
released from pneumolysin‐damaged mitochondria via the
STING
signaling pathway in macrophages. FEBS J 2019; 286:4754-4768. [DOI: 10.1111/febs.15001] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2018] [Revised: 03/08/2019] [Accepted: 07/13/2019] [Indexed: 12/18/2022]
Affiliation(s)
- Xuexue Hu
- Key Laboratory of Diagnostic Medicine Designated by the Ministry of Education Chongqing Medical University China
- School of Laboratory Medicine Chongqing Medical University China
| | - Xiaoqiong Peng
- Department of Ultrasound The First Affiliated Hospital of Chongqing Medical University China
| | - Chang Lu
- Key Laboratory of Diagnostic Medicine Designated by the Ministry of Education Chongqing Medical University China
- School of Laboratory Medicine Chongqing Medical University China
| | - Xuemei Zhang
- Key Laboratory of Diagnostic Medicine Designated by the Ministry of Education Chongqing Medical University China
- School of Laboratory Medicine Chongqing Medical University China
| | - Lingling Gan
- Key Laboratory of Diagnostic Medicine Designated by the Ministry of Education Chongqing Medical University China
- School of Laboratory Medicine Chongqing Medical University China
| | - Yue Gao
- Key Laboratory of Diagnostic Medicine Designated by the Ministry of Education Chongqing Medical University China
- School of Laboratory Medicine Chongqing Medical University China
| | - Shenghui Yang
- Key Laboratory of Diagnostic Medicine Designated by the Ministry of Education Chongqing Medical University China
- School of Laboratory Medicine Chongqing Medical University China
| | - Wenchun Xu
- Key Laboratory of Diagnostic Medicine Designated by the Ministry of Education Chongqing Medical University China
- School of Laboratory Medicine Chongqing Medical University China
| | - Jian Wang
- Key Laboratory of Diagnostic Medicine Designated by the Ministry of Education Chongqing Medical University China
- School of Laboratory Medicine Chongqing Medical University China
| | - Yibing Yin
- Key Laboratory of Diagnostic Medicine Designated by the Ministry of Education Chongqing Medical University China
- School of Laboratory Medicine Chongqing Medical University China
| | - Hong Wang
- Key Laboratory of Diagnostic Medicine Designated by the Ministry of Education Chongqing Medical University China
- School of Laboratory Medicine Chongqing Medical University China
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13
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Samavarchi Tehrani S, Mahmoodzadeh Hosseini H, Yousefi T, Abolghasemi M, Qujeq D, Maniati M, Amani J. The crosstalk between trace elements with DNA damage response, repair, and oxidative stress in cancer. J Cell Biochem 2019; 120:1080-1105. [PMID: 30378148 DOI: 10.1002/jcb.27617] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2018] [Accepted: 08/14/2018] [Indexed: 01/24/2023]
Abstract
DNA damage response (DDR) is a regulatory system responsible for maintaining genome integrity and stability, which can sense and transduce DNA damage signals. The severity of damage appears to determine DDRs, which can include damage repair, cell-cycle arrest, and apoptosis. Furthermore, defective components in DNA damage and repair machinery are an underlying cause for the development and progression of various types of cancers. Increasing evidence indicates that there is an association between trace elements and DDR/repair mechanisms. In fact, trace elements seem to affect mediators of DDR. Besides, it has been revealed that oxidative stress (OS) and trace elements are associated with cancer development. In this review, we discuss the role of some critical trace elements in the risk of cancer. In addition, we provide a brief introduction on DDR and OS in cancer. Finally, we will further review the interactions between some important trace elements including selenium, zinc, chromium, cadmium, and arsenic, and DDR, and OS in cancer.
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Affiliation(s)
- Sadra Samavarchi Tehrani
- Applied Microbiology Research Center, Systems Biology and Poisonings Institute, Baqiyatallah University of Medical Sciences, Tehran, Iran
| | - Hamideh Mahmoodzadeh Hosseini
- Applied Microbiology Research Center, Systems Biology and Poisonings Institute, Baqiyatallah University of Medical Sciences, Tehran, Iran
| | - Tooba Yousefi
- Student Research Committee, Babol University of Medical Sciences, Babol, Iran
| | - Maryam Abolghasemi
- Student Research Committee, Babol University of Medical Sciences, Babol, Iran
| | - Durdi Qujeq
- Department of Clinical Biochemistry, Babol University of Medical Sciences, Babol, Iran
| | - Mahmood Maniati
- English Department, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
| | - Jafar Amani
- Applied Microbiology Research Center, Systems Biology and Poisonings Institute, Baqiyatallah University of Medical Sciences, Tehran, Iran
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14
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Jiang X, Wang L, Carroll SL, Chen J, Wang MC, Wang J. Challenges and Opportunities for Small-Molecule Fluorescent Probes in Redox Biology Applications. Antioxid Redox Signal 2018; 29:518-540. [PMID: 29320869 PMCID: PMC6056262 DOI: 10.1089/ars.2017.7491] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/26/2017] [Accepted: 01/07/2018] [Indexed: 12/21/2022]
Abstract
SIGNIFICANCE The concentrations of reactive oxygen/nitrogen species (ROS/RNS) are critical to various biochemical processes. Small-molecule fluorescent probes have been widely used to detect and/or quantify ROS/RNS in many redox biology studies and serve as an important complementary to protein-based sensors with unique applications. Recent Advances: New sensing reactions have emerged in probe development, allowing more selective and quantitative detection of ROS/RNS, especially in live cells. Improvements have been made in sensing reactions, fluorophores, and bioavailability of probe molecules. CRITICAL ISSUES In this review, we will not only summarize redox-related small-molecule fluorescent probes but also lay out the challenges of designing probes to help redox biologists independently evaluate the quality of reported small-molecule fluorescent probes, especially in the chemistry literature. We specifically highlight the advantages of reversibility in sensing reactions and its applications in ratiometric probe design for quantitative measurements in living cells. In addition, we compare the advantages and disadvantages of small-molecule probes and protein-based probes. FUTURE DIRECTIONS The low physiological relevant concentrations of most ROS/RNS call for new sensing reactions with better selectivity, kinetics, and reversibility; fluorophores with high quantum yield, wide wavelength coverage, and Stokes shifts; and structural design with good aqueous solubility, membrane permeability, low protein interference, and organelle specificity. Antioxid. Redox Signal. 29, 518-540.
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Affiliation(s)
- Xiqian Jiang
- Department of Pharmacology and Chemical Biology, Baylor College of Medicine, Houston, Texas
| | - Lingfei Wang
- Department of Pharmacology and Chemical Biology, Baylor College of Medicine, Houston, Texas
| | - Shaina L. Carroll
- Department of Pharmacology and Chemical Biology, Baylor College of Medicine, Houston, Texas
| | - Jianwei Chen
- Department of Pharmacology and Chemical Biology, Baylor College of Medicine, Houston, Texas
| | - Meng C. Wang
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas
- Huffington Center on Aging, Baylor College of Medicine, Houston, Texas
| | - Jin Wang
- Department of Pharmacology and Chemical Biology, Baylor College of Medicine, Houston, Texas
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, Texas
- Center for Drug Discovery, Baylor College of Medicine, Houston, Texas
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15
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Li SJ, Li YF, Liu HW, Zhou DY, Jiang WL, Ou-Yang J, Li CY. A Dual-Response Fluorescent Probe for the Detection of Viscosity and H2S and Its Application in Studying Their Cross-Talk Influence in Mitochondria. Anal Chem 2018; 90:9418-9425. [DOI: 10.1021/acs.analchem.8b02068] [Citation(s) in RCA: 133] [Impact Index Per Article: 22.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Song-Jiao Li
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province, Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan, 411105, PR China
| | - Yong-Fei Li
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province, Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan, 411105, PR China
- College of Chemical Engineering, Xiangtan University, Xiangtan, 411105, PR China
| | - Hong-Wen Liu
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province, Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan, 411105, PR China
| | - Dong-Ye Zhou
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province, Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan, 411105, PR China
| | - Wen-Li Jiang
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province, Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan, 411105, PR China
| | - Juan Ou-Yang
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province, Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan, 411105, PR China
| | - Chun-Yan Li
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province, Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan, 411105, PR China
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry & Chemical Engineering, Hunan University, Changsha, 410082, PR China
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16
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Corteselli EM, Samet JM, Gibbs-Flournoy EA. Imaging Approaches to Assessments of Toxicological Oxidative Stress Using Genetically-encoded Fluorogenic Sensors. J Vis Exp 2018. [PMID: 29443110 DOI: 10.3791/56945] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
While oxidative stress is a commonly cited toxicological mechanism, conventional methods to study it suffer from a number of shortcomings, including destruction of the sample, introduction of potential artifacts, and a lack of specificity for the reactive species involved. Thus, there is a current need in the field of toxicology for non-destructive, sensitive, and specific methods that can be used to observe and quantify intracellular redox perturbations, more commonly referred to as oxidative stress. Here, we present a method for the use of two genetically-encoded fluorogenic sensors, roGFP2 and HyPer, to be used in live-cell imaging studies to observe xenobiotic-induced oxidative responses. roGFP2 equilibrates with the glutathione redox potential (EGSH), while HyPer directly detects hydrogen peroxide (H2O2). Both sensors can be expressed into various cell types via transfection or transduction, and can be targeted to specific cellular compartments. Most importantly, live-cell microscopy using these sensors offers high spatial and temporal resolution that is not possible using conventional methods. Changes in the fluorescence intensity monitored at 510 nm serves as the readout for both genetically-encoded fluorogenic sensors when sequentially excited by 404 nm and 488 nm light. This property makes both sensors ratiometric, eliminating common microscopy artifacts and correcting for differences in sensor expression between cells. This methodology can be applied across a variety of fluorometric platforms capable of exciting and collecting emissions at the prescribed wavelengths, making it suitable for use with confocal imaging systems, conventional wide-field microscopy, and plate readers. Both genetically-encoded fluorogenic sensors have been used in a variety of cell types and toxicological studies to monitor cellular EGSH and H2O2 generation in real-time. Outlined here is a standardized method that is widely adaptable across cell types and fluorometric platforms for the application of roGFP2 and HyPer in live-cell toxicological assessments of oxidative stress.
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Affiliation(s)
- Elizabeth M Corteselli
- Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina at Chapel Hill
| | - James M Samet
- Environmental Public Health Division, National Health and Environmental Effects Research Laboratory, U.S. Environmental Protection Agency;
| | - Eugene A Gibbs-Flournoy
- Environmental Public Health Division, National Health and Environmental Effects Research Laboratory, U.S. Environmental Protection Agency; Oak Ridge Institute for Science and Education
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17
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Raguvaran R, Manuja A, Manuja BK, Riyesh T, Singh S, Kesavan M, Dimri U. Sodium alginate and gum acacia hydrogels of zinc oxide nanoparticles reduce hemolytic and oxidative stress inflicted by zinc oxide nanoparticles on mammalian cells. Int J Biol Macromol 2017; 101:967-972. [DOI: 10.1016/j.ijbiomac.2017.03.180] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2017] [Revised: 02/27/2017] [Accepted: 03/29/2017] [Indexed: 01/13/2023]
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18
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19
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Qin X, Zhang J, Wang B, Xu G, Zou Z. LAMP-2 mediates oxidative stress-dependent cell death in Zn 2+ -treated lung epithelium cells. Biochem Biophys Res Commun 2017; 488:177-181. [DOI: 10.1016/j.bbrc.2017.05.030] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2017] [Accepted: 05/05/2017] [Indexed: 01/21/2023]
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20
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Abstract
The balance of oxidants and antioxidants within the cell is crucial for maintaining health, and regulating physiological processes such as signalling. Consequently, imbalances between oxidants and antioxidants are now understood to lead to oxidative stress, a physiological feature that underlies many diseases. These processes have spurred the field of chemical biology to develop a plethora of sensors, both small-molecule and fluorescent protein-based, for the detection of specific oxidizing species and general redox balances within cells. The mitochondrion, in particular, is the site of many vital redox reactions. There is therefore a need to target redox sensors to this particular organelle. It has been well established that targeting mitochondria can be achieved by the use of a lipophilic cation-targeting group, or by utilizing natural peptidic mitochondrial localization sequences. Here, we review how these two approaches have been used by a number of researchers to develop mitochondrially localized fluorescent redox sensors that are already proving useful in providing insights into the roles of reactive oxygen species in the mitochondria.
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Affiliation(s)
| | | | - Elizabeth J. New
- School of Chemistry, The University of Sydney, New South Wales 2006, Australia
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21
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Bacchetta R, Santo N, Marelli M, Nosengo G, Tremolada P. Chronic toxicity effects of ZnSO 4 and ZnO nanoparticles in Daphnia magna. ENVIRONMENTAL RESEARCH 2017; 152:128-140. [PMID: 27771567 DOI: 10.1016/j.envres.2016.10.006] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2016] [Revised: 10/06/2016] [Accepted: 10/10/2016] [Indexed: 06/06/2023]
Abstract
The chronic toxicity of ZnSO4 and ZnO nanoparticles has been studied in Daphnia magna also considering the life cycle parameters beyond the standard 21-day exposure time. Specimens have been individually followed until the natural end of their life, and some of them sampled for microscopic analyses at 48h, 9 and 21 days. Despite the low level of exposure (0.3mg Zn/L), ultrastructural analyses of the midgut epithelial cells revealed efficient internalization of nanoparticles between 48h and 9d, and translocation to other tissues as well. At 21d, the most affected fields have been recorded for both compounds; in particular samples exposed to ZnO nanoparticles showed swelling of mitochondria, while those exposed to ZnSO4 had a great number of autophagy vacuoles. The life cycle parameters resulted altered as well, with a significant inhibition of reproduction in both groups, when compared to controls. After the 21-day exposure, some interesting results were obtained: animals, previously exposed to nanoZnO at low concentrations, showed a complete recovery of the full reproduction potential, while those previously exposed to ZnSO4 presented a dose-dependent and compound-specific reduction in lifespan. Based on the results from the present research and the effects of the same chemicals at higher doses, it can be concluded that the soluble form plays a key role in ZnO nanoparticle cytotoxicity, and that the nanoparticulate form is able to locally increase the amount of Zn inside the cell, even within the ovary. It's worth noting that ZnO nanoparticles have been internalized despite the very low concentration used: this raises concern about the possible environmental implications which may derive from their use, and which in turn must be carefully considered.
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Affiliation(s)
- Renato Bacchetta
- Department of Life Sciences, Università degli Studi di Milano, Via G. Celoria, 26, I-20133 Milan, Italy.
| | - Nadia Santo
- Department of Life Sciences, Università degli Studi di Milano, Via G. Celoria, 26, I-20133 Milan, Italy
| | - Marcello Marelli
- CNR-ISTM - Istituto di Scienze e Tecnologie Molecolari, Via C. Golgi, 19, I-20133 Milan, Italy
| | - Greta Nosengo
- Department of Life Sciences, Università degli Studi di Milano, Via G. Celoria, 26, I-20133 Milan, Italy
| | - Paolo Tremolada
- Department of Life Sciences, Università degli Studi di Milano, Via G. Celoria, 26, I-20133 Milan, Italy
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22
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Silvestri S, Orlando P, Brugè F, Falcioni G, Tiano L. Effect of different metals on oxidative state and mitochondrial membrane potential in trout erythrocytes. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2016; 134P1:280-285. [PMID: 27566895 DOI: 10.1016/j.ecoenv.2016.07.040] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2016] [Revised: 07/26/2016] [Accepted: 07/27/2016] [Indexed: 06/06/2023]
Abstract
Homeostasis of metal ions is critical for life and excessive exposure can promote cellular damage that could be due to oxidative damage. In this context we evaluated the effects of three different elements (copper, zinc and aluminum) on oxidative stress and mitochondrial functionality in nucleated trout erythrocytes (Oncorhynchus mykiss). Flowcytometric measurements using MitoProbe and DCFDA-H2 as fluorescent probes, indicated that redox active copper was able to influence all the biological parameters considered while redox inert, zinc and aluminum, show no significant effects. Toxicity of Al and Zn represent a debated argument and their ability to interact with other endogenous metal ions/metal binding proteins could play a role modulating their cellular toxicity.
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Affiliation(s)
- Sonia Silvestri
- Department of Clinical Dental Sciences, Polytechnic University of Marche, Ancona, Italy
| | - Patrick Orlando
- Department of Clinical Dental Sciences, Polytechnic University of Marche, Ancona, Italy
| | - Francesca Brugè
- Department of Clinical Dental Sciences, Polytechnic University of Marche, Ancona, Italy
| | | | - Luca Tiano
- Department of Clinical Dental Sciences, Polytechnic University of Marche, Ancona, Italy.
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23
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Bacchetta R, Maran B, Marelli M, Santo N, Tremolada P. Role of soluble zinc in ZnO nanoparticle cytotoxicity in Daphnia magna: A morphological approach. ENVIRONMENTAL RESEARCH 2016; 148:376-385. [PMID: 27131075 DOI: 10.1016/j.envres.2016.04.028] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2016] [Revised: 04/18/2016] [Accepted: 04/20/2016] [Indexed: 06/05/2023]
Abstract
The role of soluble zinc has been determined in Daphnia magna by a morphological approach, integrating a previous paper in which the ultrastructural damages to gut epithelial cells have been studied after ZnO nanoparticles exposure. In the present paper, the toxicity and morphological effects of soluble zinc from ZnSO4 have been determined in a 48-h acute exposure test. Daphnids have been exposed to six nominal zinc concentrations (0.075, 0.15, 0.3, 0.6, 1.2, and 2.4mg Zn/L) and then fixed for microscopic analyses. Data from the acute toxicity tests gave an EC50 value of 0.99mg/L and showed that no immobilization appeared up to 0.3mg Zn/L. Ultrastructural analyses of samples from the two highest concentrations showed large vacuolar structures, swelling of mitochondria, multilamellar bodies, and a great number of autophagy vacuoles. These findings have been compared to those from our previous study, and similarities and/or differences discussed. Based on the overall results it can be concluded that dissolved zinc ions played a key role in ZnO nanoparticle toxicity and that the morphological approach is an extremely useful tool for comparing toxicological effects as well. A possible common toxic mechanism of soluble zinc and ZnO nanoparticles was also proposed.
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Affiliation(s)
- Renato Bacchetta
- Department of Life Sciences, Università degli Studi di Milano, Via G. Celoria, 26, I-20133 Milan, Italy.
| | - Barbara Maran
- Department of Life Sciences, Università degli Studi di Milano, Via G. Celoria, 26, I-20133 Milan, Italy
| | - Marcello Marelli
- CNR - Istituto di Scienze e Tecnologie Molecolari, Via C. Golgi, 19, I-20133 Milan, Italy
| | - Nadia Santo
- Department of Life Sciences, Università degli Studi di Milano, Via G. Celoria, 26, I-20133 Milan, Italy
| | - Paolo Tremolada
- Department of Life Sciences, Università degli Studi di Milano, Via G. Celoria, 26, I-20133 Milan, Italy
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24
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Currier JM, Cheng WY, Menendez D, Conolly R, Chorley BN. Developing a Gene Biomarker at the Tipping Point of Adaptive and Adverse Responses in Human Bronchial Epithelial Cells. PLoS One 2016; 11:e0155875. [PMID: 27195669 PMCID: PMC4873291 DOI: 10.1371/journal.pone.0155875] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2016] [Accepted: 05/05/2016] [Indexed: 12/26/2022] Open
Abstract
Determining mechanism-based biomarkers that distinguish adaptive and adverse cellular processes is critical to understanding the health effects of environmental exposures. Shifting from in vivo, low-throughput toxicity studies to high-throughput screening (HTS) paradigms and risk assessment based on in vitro and in silico testing requires utilizing toxicity pathway information to distinguish adverse outcomes from recoverable adaptive events. Little work has focused on oxidative stresses in human airway for the purposes of predicting adverse responses. We hypothesize that early gene expression-mediated molecular changes could be used to delineate adaptive and adverse responses to environmentally-based perturbations. Here, we examined cellular responses of the tracheobronchial airway to zinc (Zn) exposure, a model oxidant. Airway derived BEAS-2B cells exposed to 2–10 μM Zn2+ elicited concentration- and time-dependent cytotoxicity. Normal, adaptive, and cytotoxic Zn2+ exposure conditions were determined with traditional apical endpoints, and differences in global gene expression around the tipping point of the responses were used to delineate underlying molecular mechanisms. Bioinformatic analyses of differentially expressed genes indicate early enrichment of stress signaling pathways, including those mediated by the transcription factors p53 and NRF2. After 4 h, 154 genes were differentially expressed (p < 0.01) between the adaptive and cytotoxic Zn2+ concentrations. Nearly 40% of the biomarker genes were related to the p53 signaling pathway with 30 genes identified as likely direct targets using a database of p53 ChIP-seq studies. Despite similar p53 activation profiles, these data revealed widespread dampening of p53 and NRF2-related genes as early as 4 h after exposure at higher, unrecoverable Zn2+ exposures. Thus, in our model early increased activation of stress response pathways indicated a recoverable adaptive event. Overall, this study highlights the importance of characterizing molecular mechanisms around the tipping point of adverse responses to better inform HTS paradigms.
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Affiliation(s)
- Jenna M. Currier
- Oak Ridge Institute for Science and Education at U.S. Environmental Protection Agency, Research Triangle Park, North Carolina, United States of America
| | - Wan-Yun Cheng
- Oak Ridge Institute for Science and Education at U.S. Environmental Protection Agency, Research Triangle Park, North Carolina, United States of America
| | - Daniel Menendez
- Genome Integrity & Structural Biology Laboratory, National Institute of Environmental Health Sciences, NIH, Research Triangle Park, North Carolina, United States of America
| | - Rory Conolly
- National Health and Environmental Effects Research Laboratory, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina, United States of America
| | - Brian N. Chorley
- National Health and Environmental Effects Research Laboratory, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina, United States of America
- * E-mail:
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25
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Schwarzländer M, Dick TP, Meyer AJ, Morgan B. Dissecting Redox Biology Using Fluorescent Protein Sensors. Antioxid Redox Signal 2016; 24:680-712. [PMID: 25867539 DOI: 10.1089/ars.2015.6266] [Citation(s) in RCA: 191] [Impact Index Per Article: 23.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
SIGNIFICANCE Fluorescent protein sensors have revitalized the field of redox biology by revolutionizing the study of redox processes in living cells and organisms. RECENT ADVANCES Within one decade, a set of fundamental new insights has been gained, driven by the rapid technical development of in vivo redox sensing. Redox-sensitive yellow and green fluorescent protein variants (rxYFP and roGFPs) have been the central players. CRITICAL ISSUES Although widely used as an established standard tool, important questions remain surrounding their meaningful use in vivo. We review the growing range of thiol redox sensor variants and their application in different cells, tissues, and organisms. We highlight five key findings where in vivo sensing has been instrumental in changing our understanding of redox biology, critically assess the interpretation of in vivo redox data, and discuss technical and biological limitations of current redox sensors and sensing approaches. FUTURE DIRECTIONS We explore how novel sensor variants may further add to the current momentum toward a novel mechanistic and integrated understanding of redox biology in vivo. Antioxid. Redox Signal. 24, 680-712.
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Affiliation(s)
- Markus Schwarzländer
- 1 Plant Energy Biology Lab, Department Chemical Signalling, Institute of Crop Science and Resource Conservation (INRES), University of Bonn , Bonn, Germany
| | - Tobias P Dick
- 2 Division of Redox Regulation, German Cancer Research Center (DKFZ) , DKFZ-ZMBH Alliance, Heidelberg, Germany
| | - Andreas J Meyer
- 3 Department Chemical Signalling, Institute of Crop Science and Resource Conservation (INRES), University of Bonn , Bonn, Germany
| | - Bruce Morgan
- 2 Division of Redox Regulation, German Cancer Research Center (DKFZ) , DKFZ-ZMBH Alliance, Heidelberg, Germany .,4 Cellular Biochemistry, Department of Biology, University of Kaiserslautern , Kaiserslautern, Germany
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26
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Abstract
Exposure of cells to micromolar Cu activates recombinant transcription factor EB (TFEB), leading to expression of the lysosomal network genes. Whereas TFEB overexpression has a cytoprotective effect under moderate Cu exposure, it enhances oxidative stress and mitochondrial damage caused by high levels of Cu. Transition metal toxicity is an important factor in the pathogenesis of numerous human disorders, including neurodegenerative diseases. Lysosomes have emerged as important factors in transition metal toxicity because they handle transition metals via endocytosis, autophagy, absorption from the cytoplasm and exocytosis. Transcription factor EB (TFEB) regulates lysosomal biogenesis and the expression of lysosomal proteins in response to lysosomal and/or metabolic stresses. Since transition metals cause lysosomal dysfunction, we proposed that TFEB may be activated to drive gene expression in response to transition metal exposure and that such activation may influence transition metal toxicity. We found that transition metals copper (Cu) and iron (Fe) activate recombinant TFEB and stimulate the expression of TFEB-dependent genes in TFEB-overexpressing cells. In cells that show robust lysosomal exocytosis, TFEB was cytoprotective at moderate levels of Cu exposure, decreasing oxidative stress as reported by the expression of heme oxygenase-1 (HMOX1) gene. However, at high levels of Cu exposure, particularly in cells with low levels of lysosomal exocytosis, activation of overexpressed TFEB was toxic, increasing oxidative stress and mitochondrial damage. Based on these data, we conclude that TFEB-driven gene network is a component of the cellular response to transition metals. These data suggest limitations and disadvantages of TFEB overexpression as a therapeutic approach.
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27
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Wages PA, Silbajoris R, Speen A, Brighton L, Henriquez A, Tong H, Bromberg PA, Simmons SO, Samet JM. Role of H2O2 in the oxidative effects of zinc exposure in human airway epithelial cells. Redox Biol 2014; 3:47-55. [PMID: 25462065 PMCID: PMC4297933 DOI: 10.1016/j.redox.2014.10.005] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2014] [Revised: 10/07/2014] [Accepted: 10/21/2014] [Indexed: 11/25/2022] Open
Abstract
Human exposure to particulate matter (PM) is a global environmental health concern. Zinc (Zn2+) is a ubiquitous respiratory toxicant that has been associated with PM health effects. However, the molecular mechanism of Zn2+ toxicity is not fully understood. H2O2 and Zn2+ have been shown to mediate signaling leading to adverse cellular responses in the lung and we have previously demonstrated Zn2+ to cause cellular H2O2 production. To determine the role of Zn2+-induced H2O2 production in the human airway epithelial cell response to Zn2+ exposure. BEAS-2B cells expressing the redox-sensitive fluorogenic sensors HyPer (H2O2) or roGFP2 (EGSH) in the cytosol or mitochondria were exposed to 50 µM Zn2+ for 5 min in the presence of 1 µM of the zinc ionophore pyrithione. Intracellular H2O2 levels were modulated using catalase expression either targeted to the cytosol or ectopically to the mitochondria. HO-1 mRNA expression was measured as a downstream marker of response to oxidative stress induced by Zn2+ exposure. Both cytosolic catalase overexpression and ectopic catalase expression in mitochondria were effective in ablating Zn2+-induced elevations in H2O2. Compartment-directed catalase expression blunted Zn2+-induced elevations in cytosolic EGSH and the increased expression of HO-1 mRNA levels. Zn2+ leads to multiple oxidative effects that are exerted through H2O2-dependent and independent mechanisms. We used targeted catalase expression to examine the role of H2O2 in Zn2+-induced effects. Cytosolic or mitochondrial catalase ablated Zn2+-induced mitochondrial H2O2 production. Catalase expression blunted Zn2+-induced cytosolic EGSH and HO-1 mRNA. Independently, decreasing GSHtotal or increasing EGSH failed to induce HO-1 mRNA. Zn2+ causes multiple oxidative effects by H2O2-dependent and independent mechanisms.
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Affiliation(s)
- Phillip A Wages
- Curriculum in Toxicology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Robert Silbajoris
- EPHD, NHEERL, US Environmental Protection Agency, Chapel Hill, NC, USA
| | - Adam Speen
- Curriculum in Toxicology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Luisa Brighton
- CEMALB, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Andres Henriquez
- Curriculum in Toxicology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Haiyan Tong
- EPHD, NHEERL, US Environmental Protection Agency, Chapel Hill, NC, USA
| | - Philip A Bromberg
- CEMALB, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | | | - James M Samet
- EPHD, NHEERL, US Environmental Protection Agency, Chapel Hill, NC, USA.
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28
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Liu XL, Du XJ, Dai CG, Song QH. Ratiometric Two-Photon Fluorescent Probes for Mitochondrial Hydrogen Sulfide in Living Cells. J Org Chem 2014; 79:9481-9. [DOI: 10.1021/jo5014838] [Citation(s) in RCA: 95] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Xiu-Ling Liu
- Department
of Chemistry, University of Science and Technology of China, Hefei 230026, P. R. China
| | - Xiao-Jiao Du
- School
of Life Sciences, University of Science and Technology of China, Hefei 230027, P. R. China
| | - Chun-Guang Dai
- Department
of Chemistry, University of Science and Technology of China, Hefei 230026, P. R. China
| | - Qin-Hua Song
- Department
of Chemistry, University of Science and Technology of China, Hefei 230026, P. R. China
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Kaludercic N, Deshwal S, Di Lisa F. Reactive oxygen species and redox compartmentalization. Front Physiol 2014; 5:285. [PMID: 25161621 PMCID: PMC4130307 DOI: 10.3389/fphys.2014.00285] [Citation(s) in RCA: 120] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2014] [Accepted: 07/11/2014] [Indexed: 01/01/2023] Open
Abstract
Reactive oxygen species (ROS) formation and signaling are of major importance and regulate a number of processes in physiological conditions. A disruption in redox status regulation, however, has been associated with numerous pathological conditions. In recent years it has become increasingly clear that oxidative and reductive modifications are confined in a spatio-temporal manner. This makes ROS signaling similar to that of Ca(2+) or other second messengers. Some subcellular compartments are more oxidizing (such as lysosomes or peroxisomes) whereas others are more reducing (mitochondria, nuclei). Moreover, although more reducing, mitochondria are especially susceptible to oxidation, most likely due to the high number of exposed thiols present in that compartment. Recent advances in the development of redox probes allow specific measurement of defined ROS in different cellular compartments in intact living cells or organisms. The availability of these tools now allows simultaneous spatio-temporal measurements and correlation between ROS generation and organelle and/or cellular function. The study of ROS compartmentalization and microdomains will help elucidate their role in physiology and disease. Here we will examine redox probes currently available and how ROS generation may vary between subcellular compartments. Furthermore, we will discuss ROS compartmentalization in physiological and pathological conditions focusing our attention on mitochondria, since their vulnerability to oxidative stress is likely at the basis of several diseases.
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Affiliation(s)
- Nina Kaludercic
- Neuroscience Institute, National Research Council of Italy (CNR) Padova, Italy
| | - Soni Deshwal
- Department of Biomedical Sciences, University of Padova Padova, Italy
| | - Fabio Di Lisa
- Neuroscience Institute, National Research Council of Italy (CNR) Padova, Italy ; Department of Biomedical Sciences, University of Padova Padova, Italy
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Jain S, Rachamalla M, Kulkarni A, Kaur J, Tikoo K. Pulmonary fibrotic response to inhalation of ZnO nanoparticles and toluene co-exposure through directed flow nose only exposure chamber. Inhal Toxicol 2014; 25:703-13. [PMID: 24255948 DOI: 10.3109/08958378.2013.839765] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
The increasing use of Zinc Oxide nanoparticles (ZnONPs) in paint industry is not supplemented with adequate toxicology data. This report focuses on the fibrogenic toxicity caused due to co-exposure of ZnONPs and toluene in male Wistar rats, exposed for 28 days, through directed flow nose only exposure chamber. The rats were grouped as air control, toluene control (200 ppm), zinc oxide control (10 mg/m(3)), low dose co-exposed (5 mg/m(3) ZnO and 200 ppm of toluene) and high dose co-exposed (10 mg/m(3) of ZnO and 200 ppm of toluene). Our study demonstrates that co-exposure of ZnONPs and toluene (as in paint industry), even at their respective permissible exposure level (5 mg/m(3) for ZnO and 200 ppm for toluene) have the potential to produce a progressive inflammatory and fibrotic response in the alveolar tissues of the lungs. We observed a significant increase in inflammatory markers in BAL fluid and elevated malondialdehyde (MDA) levels with lower levels of intracellular reduced glutathione (GSH) in lungs of rats of co-exposed group. Significant increase in the levels of pro-inflammatory mediators (IL-6, Ikβα, Cox-II, p-NF-κB) in lung tissues also indicated pulmonary damage. To best of our knowledge this is the first study which highlights the toxicity of co-exposed ZnO NPs and toluene.
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Affiliation(s)
- Sonam Jain
- Laboratory of Chromatin Biology, Department of Pharmacology and Toxicology, National Institute of Pharmaceutical Education and Research (NIPER) , Mohali, Punjab , India
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Snow SJ, Cheng W, Wolberg AS, Carraway MS. Air pollution upregulates endothelial cell procoagulant activity via ultrafine particle-induced oxidant signaling and tissue factor expression. Toxicol Sci 2014; 140:83-93. [PMID: 24752501 DOI: 10.1093/toxsci/kfu071] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Air pollution exposure is associated with cardiovascular events triggered by clot formation. Endothelial activation and initiation of coagulation are pathophysiological mechanisms that could link inhaled air pollutants to vascular events. Here we investigated the underlying mechanisms of increased endothelial cell procoagulant activity following exposure to soluble components of ultrafine particles (soluble UF). Human coronary artery endothelial cells (HCAEC) were exposed to soluble UF and assessed for their ability to trigger procoagulant activity in platelet-free plasma. Exposed HCAEC triggered earlier thrombin generation and faster fibrin clot formation, which was abolished by an anti-tissue factor (TF) antibody, indicating TF-dependent effects. Soluble UF exposure increased TF mRNA expression without compensatory increases in key anticoagulant proteins. To identify early events that regulate TF expression, we measured endothelial H2O2 production following soluble UF exposure and identified the enzymatic source. Soluble UF exposure increased endothelial H2O2 production, and antioxidants attenuated UF-induced upregulation of TF, linking the procoagulant responses to reactive oxygen species (ROS) formation. Chemical inhibitors and RNA silencing showed that NOX-4, an important endothelial source of H2O2, was involved in UF-induced upregulation of TF mRNA. These data indicate that soluble UF exposure induces endothelial cell procoagulant activity, which involves de novo TF synthesis, ROS production, and the NOX-4 enzyme. These findings provide mechanistic insight into the adverse cardiovascular effects associated with air pollution exposure.
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Affiliation(s)
- S J Snow
- Curriculum in Toxicology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599
| | - W Cheng
- Department of Environmental Science and Engineering, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599
| | - A S Wolberg
- Department of Pathology and Laboratory Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599
| | - M S Carraway
- Environmental Public Health Division, NHEERL, US Environmental Protection Agency, Research Triangle Park, North Carolina 27599
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Loss of TRPML1 promotes production of reactive oxygen species: is oxidative damage a factor in mucolipidosis type IV? Biochem J 2013; 457:361-8. [DOI: 10.1042/bj20130647] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
TRPML1 is a lysosomal ion channel permeable to cations, including Fe2+. Our data suggest that TRPML1 redistributes Fe2+ between the lysosomes and the cytoplasm. Loss of TRPML1 leads to production of reactive oxygen species, and to mitochondrial deterioration.
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Wu W, Bromberg PA, Samet JM. Zinc ions as effectors of environmental oxidative lung injury. Free Radic Biol Med 2013; 65:57-69. [PMID: 23747928 DOI: 10.1016/j.freeradbiomed.2013.05.048] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/04/2013] [Revised: 04/29/2013] [Accepted: 05/31/2013] [Indexed: 12/30/2022]
Abstract
The redox-inert transition metal Zn is a micronutrient that plays essential roles in protein structure, catalysis, and regulation of function. Inhalational exposure to ZnO or to soluble Zn salts in occupational and environmental settings leads to adverse health effects, the severity of which appears dependent on the flux of Zn(2+) presented to the airway and alveolar cells. The cellular toxicity of exogenous Zn(2+) exposure is characterized by cellular responses that include mitochondrial dysfunction, elevated production of reactive oxygen species, and loss of signaling quiescence leading to cell death and increased expression of adaptive and inflammatory genes. Central to the molecular effects of Zn(2+) are its interactions with cysteinyl thiols, which alters their functionality by modulating their reactivity and participation in redox reactions. Ongoing studies aimed at elucidating the molecular toxicology of Zn(2+) in the lung are contributing valuable information about its role in redox biology and cellular homeostasis in normal and pathophysiology.
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Affiliation(s)
- Weidong Wu
- School of Public Health XinXiang Medical University XinXiang, China 453003; Center for Environmental Medicine, Asthma and Lung Biology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Philip A Bromberg
- Center for Environmental Medicine, Asthma and Lung Biology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - James M Samet
- Environmental Public Health Division, National Health and Environmental Effects Research Laboratory, U.S. EPA, Chapel Hill, NC 27514, USA.
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Bae SK, Heo CH, Choi DJ, Sen D, Joe EH, Cho BR, Kim HM. A Ratiometric Two-Photon Fluorescent Probe Reveals Reduction in Mitochondrial H2S Production in Parkinson’s Disease Gene Knockout Astrocytes. J Am Chem Soc 2013; 135:9915-23. [DOI: 10.1021/ja404004v] [Citation(s) in RCA: 340] [Impact Index Per Article: 30.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Sung Keun Bae
- Division of Energy Systems Research,
Ajou University, Suwon 443-749, Korea
| | - Cheol Ho Heo
- Division of Energy Systems Research,
Ajou University, Suwon 443-749, Korea
| | - Dong Joo Choi
- Department of Pharmacology/Neuroscience
Graduate Program, Ajou University School of Medicine, Suwon 443-721,
Korea
| | - Debabrata Sen
- Division of Energy Systems Research,
Ajou University, Suwon 443-749, Korea
| | - Eun-Hye Joe
- Department of Pharmacology/Neuroscience
Graduate Program, Ajou University School of Medicine, Suwon 443-721,
Korea
| | - Bong Rae Cho
- Department of Chemistry,
Korea
University, Seoul 136-701, Korea
| | - Hwan Myung Kim
- Division of Energy Systems Research,
Ajou University, Suwon 443-749, Korea
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Meng Q, Richmond-Bryant J, Lu SE, Buckley B, Welsh WJ, Whitsel EA, Hanna A, Yeatts KB, Warren J, Herring AH, Xiu A. Cardiovascular outcomes and the physical and chemical properties of metal ions found in particulate matter air pollution: a QICAR study. ENVIRONMENTAL HEALTH PERSPECTIVES 2013; 121:558-64. [PMID: 23462649 PMCID: PMC3673192 DOI: 10.1289/ehp.1205793] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2012] [Accepted: 03/04/2013] [Indexed: 05/04/2023]
Abstract
BACKGROUND This paper presents an application of quantitative ion character-activity relationships (QICAR) to estimate associations of human cardiovascular (CV) diseases (CVDs) with a set of metal ion properties commonly observed in ambient air pollutants. QICAR has previously been used to predict ecotoxicity of inorganic metal ions based on ion properties. OBJECTIVES The objective of this work was to examine potential associations of biological end points with a set of physical and chemical properties describing inorganic metal ions present in exposures using QICAR. METHODS Chemical and physical properties of 17 metal ions were obtained from peer-reviewed publications. Associations of cardiac arrhythmia, myocardial ischemia, myocardial infarction, stroke, and thrombosis with exposures to metal ions (measured as inference scores) were obtained from the Comparative Toxicogenomics Database (CTD). Robust regressions were applied to estimate the associations of CVDs with ion properties. RESULTS CVD was statistically significantly associated (Bonferroni-adjusted significance level of 0.003) with many ion properties reflecting ion size, solubility, oxidation potential, and abilities to form covalent and ionic bonds. The properties are relevant for reactive oxygen species (ROS) generation, which has been identified as a possible mechanism leading to CVDs. CONCLUSION QICAR has the potential to complement existing epidemiologic methods for estimating associations between CVDs and air pollutant exposures by providing clues about the underlying mechanisms that may explain these associations.
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Affiliation(s)
- Qingyu Meng
- School of Public Health, University of Medicine and Dentistry of New Jersey, Piscataway, New Jersey, USA
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Gibbs-Flournoy EA, Simmons SO, Bromberg PA, Dick TP, Samet JM. Monitoring intracellular redox changes in ozone-exposed airway epithelial cells. ENVIRONMENTAL HEALTH PERSPECTIVES 2013; 121:312-317. [PMID: 23249900 PMCID: PMC3621206 DOI: 10.1289/ehp.1206039] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/20/2012] [Accepted: 12/17/2012] [Indexed: 06/01/2023]
Abstract
BACKGROUND The toxicity of many xenobiotic compounds is believed to involve oxidative injury to cells. Direct assessment of mechanistic events involved in xenobiotic-induced oxidative stress is not easily achievable. Development of genetically encoded probes designed for monitoring intracellular redox changes represents a methodological advance with potential applications in toxicological studies. OBJECTIVE We tested the utility of redox-sensitive green fluorescent protein (roGFP)-based redox sensors for monitoring real-time intracellular redox changes induced by xenobiotics in toxicological studies. METHODS roGFP2, a reporter of the glutathione redox potential (E(GSH)), was used to monitor EGSH in cultured human airway epithelial cells (BEAS-2B cells) undergoing exposure to 0.15-1.0 ppm ozone (O(3)). Cells were imaged in real time using a custom-built O(3) exposure system coupled to a confocal microscope. RESULTS O(3) exposure induced a dose- and time-dependent increase of the cytosolic EGSH. Additional experiments confirmed that roGFP2 is not directly oxidized, but properly equilibrates with the glutathione redox couple: Inhibition of endogenous glutaredoxin 1 (Grx1) disrupted roGFP2 responses to O(3), and a Grx1-roGFP2 fusion protein responded more rapidly to O(3) exposure. Selenite-induced up-regulation of GPx (glutathione peroxidase) expression-enhanced roGFP2 responsiveness to O(3), suggesting that (hydro)peroxides are intermediates linking O(3) exposure to glutathione oxidation. CONCLUSION Exposure to O(3) induces a profound increase in the cytosolic E(GSH) of airway epithelial cells that is indicative of an oxidant-dependent impairment of glutathione redox homeostasis. These studies demonstrate the utility of using genetically encoded redox reporters in making reliable assessments of cells undergoing exposure to xenobiotics with strong oxidizing properties.
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Affiliation(s)
- Eugene A Gibbs-Flournoy
- Curriculum in Toxicology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-7310, USA
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Polyunsaturated fatty acids cause apoptosis in C. albicans and C. dubliniensis biofilms. Biochim Biophys Acta Gen Subj 2012; 1820:1463-8. [DOI: 10.1016/j.bbagen.2012.05.004] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2012] [Revised: 04/24/2012] [Accepted: 05/10/2012] [Indexed: 01/31/2023]
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Cheng WY, Currier J, Bromberg PA, Silbajoris R, Simmons SO, Samet JM. Linking oxidative events to inflammatory and adaptive gene expression induced by exposure to an organic particulate matter component. ENVIRONMENTAL HEALTH PERSPECTIVES 2012; 120:267-74. [PMID: 21997482 PMCID: PMC3279454 DOI: 10.1289/ehp.1104055] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2011] [Accepted: 10/13/2011] [Indexed: 05/03/2023]
Abstract
BACKGROUND Toxicological studies have correlated inflammatory effects of diesel exhaust particles (DEP) with its organic constituents, such as the organic electrophile 1,2-naphthoquinone (1,2-NQ). OBJECTIVE To elucidate the mechanisms involved in 1,2-NQ-induced inflammatory responses, we examined the role of oxidant stress in 1,2-NQ-induced expression of inflammatory and adaptive genes in a human airway epithelial cell line. METHODS We measured cytosolic redox status and hydrogen peroxide (H2O2) in living cells using the genetically encoded green fluorescent protein (GFP)-based fluorescent indicators roGFP2 and HyPer, respectively. Expression of interleukin-8 (IL-8), cyclooxygenase-2 (COX-2), and heme oxygenase-1 (HO-1) mRNA was measured in BEAS-2B cells exposed to 1,2-NQ for 1-4 hr. Catalase overexpression and metabolic inhibitors were used to determine the role of redox changes and H2O2 in 1,2-NQ-induced gene expression. RESULTS Cells expressing roGFP2 and HyPer showed a rapid loss of redox potential and an increase in H2O2 of mitochondrial origin following exposure to 1,2-NQ. Overexpression of catalase diminished the H2O2-dependent signal but not the 1,2-NQ-induced loss of reducing potential. Catalase overexpression and inhibitors of mitochondrial respiration diminished elevations in IL-8 and COX-2 induced by exposure to 1,2-NQ, but potentiated HO-1 mRNA levels in BEAS cells. CONCLUSION These data show that 1,2-NQ exposure induces mitochondrial production of H2O2 that mediates the expression of inflammatory genes, but not the concurrent loss of reducing redox potential in BEAS cells. 1,2-NQ exposure also causes marked expression of HO-1 that appears to be enhanced by suppression of H2O2. These findings shed light into the oxidant-dependent events that underlie cellular responses to environmental electrophiles.
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Affiliation(s)
- Wan-Yun Cheng
- Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
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Progressive severe lung injury by zinc oxide nanoparticles; the role of Zn2+ dissolution inside lysosomes. Part Fibre Toxicol 2011; 8:27. [PMID: 21896169 PMCID: PMC3179432 DOI: 10.1186/1743-8977-8-27] [Citation(s) in RCA: 265] [Impact Index Per Article: 20.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2011] [Accepted: 09/06/2011] [Indexed: 12/17/2022] Open
Abstract
Background Large production volumes of zinc oxide nanoparticles (ZnONP) might be anticipated to pose risks, of accidental inhalation in occupational and even in consumer settings. Herein, we further investigated the pathological changes induced by ZnONP and their possible mechanism of action. Methods Two doses of ZnONP (50 and 150 cm2/rat) were intratracheally instilled into the lungs of rats with assessments made at 24 h, 1 wk, and 4 wks after instillation to evaluate dose- and time-course responses. Assessments included bronchoalveolar lavage (BAL) fluid analysis, histological analysis, transmission electron microscopy, and IgE and IgA measurement in the serum and BAL fluid. To evaluate the mechanism, alternative ZnONP, ZnONP-free bronchoalveolar lavage exudate, and dissolved Zn2+ (92.5 μg/rat) were also instilled to rats. Acridine orange staining was utilized in macrophages in culture to evaluate the lysosomal membrane destabilization by NP. Results ZnONP induced eosinophilia, proliferation of airway epithelial cells, goblet cell hyperplasia, and pulmonary fibrosis. Bronchocentric interstitial pulmonary fibrosis at the chronic phase was associated with increased myofibroblast accumulation and transforming growth factor-β positivity. Serum IgE levels were up-regulated by ZnONP along with the eosinophilia whilst serum IgA levels were down-regulated by ZnONP. ZnONP are rapidly dissolved under acidic conditions (pH 4.5) whilst they remained intact around neutrality (pH 7.4). The instillation of dissolved Zn2+ into rat lungs showed similar pathologies (eg., eosinophilia, bronchocentric interstitial fibrosis) as were elicited by ZnONP. Lysosomal stability was decreased and cell death resulted following treatment of macrophages with ZnONP in vitro. Conclusions We hypothesise that rapid, pH-dependent dissolution of ZnONP inside of phagosomes is the main cause of ZnONP-induced diverse progressive severe lung injuries.
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