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Miranda GHN, Alencar de Oliveira Lima L, Bittencourt LO, dos Santos SM, Platini Caldas de Souza M, Nogueira LS, de Oliveira EHC, Monteiro MC, Dionizio A, Leite AL, Pessan JP, Buzalaf MAR, Lima RR. Effects of long-term fluoride exposure are associated with oxidative biochemistry impairment and global proteomic modulation, but not genotoxicity, in parotid glands of mice. PLoS One 2022; 17:e0261252. [PMID: 35085268 PMCID: PMC8794182 DOI: 10.1371/journal.pone.0261252] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2021] [Accepted: 11/25/2021] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND Fluoride has become widely used in dentistry because of its effectiveness in caries control. However, evidence indicates that excessive intake interferes with the metabolic processes of different tissues. Thus, this study aimed to investigate the effects of long-term exposure to F on the parotid salivary gland of mice, from the analysis of oxidative, proteomic and genotoxic parameters. MATERIALS AND METHODS The animals received deionized water containing 0, 10 or 50 mg/L of F, as sodium fluoride, for 60 days. After, parotid glands were collected for analysis of oxidative biochemistry, global proteomic profile, genotoxicity assessment and histopathological analyses. RESULTS The results revealed that exposure to fluoride interfered in the biochemical homeostasis of the parotid gland, with increased levels of thiobarbituric acid reactive species and reduced glutathione in the exposed groups; as well as promoted alteration of the glandular proteomic profile in these groups, especially in structural proteins and proteins related to oxidative stress. However, genotoxic assessment demonstrated that exposure to fluoride did not interfere with DNA integrity in these concentrations and durations of exposure. Also, it was not observed histopathological alterations in parotid gland. CONCLUSIONS Thus, our results suggest that long-term exposure to fluoride promoted modulation of the proteomic and biochemical profile in the parotid glands, without inducing damage to the genetic component. These findings reinforce the importance of rationalizing the use of fluorides to maximize their preventative effects while minimizing the environmental risks.
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Affiliation(s)
- Giza Hellen Nonato Miranda
- Laboratory of Functional and Structural Biology, Institute of Biological Sciences, Federal University of Pará, Belém, PA, Brazil
| | | | - Leonardo Oliveira Bittencourt
- Laboratory of Functional and Structural Biology, Institute of Biological Sciences, Federal University of Pará, Belém, PA, Brazil
| | - Sávio Monteiro dos Santos
- Laboratory of Clinical Immunology and Oxidative Stress, Pharmacy Faculty, Institute of Health Science, Federal University of Pará, Belém, PA, Brazil
| | | | | | | | - Marta Chagas Monteiro
- Laboratory of Clinical Immunology and Oxidative Stress, Pharmacy Faculty, Institute of Health Science, Federal University of Pará, Belém, PA, Brazil
| | - Aline Dionizio
- Department of Biological Sciences, Bauru Dental School, University of São Paulo, Bauru, SP, Brazil
| | - Aline Lima Leite
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska, United States of America
| | - Juliano Pelim Pessan
- Department of Preventive and Restorative Dentistry, School of Dentistry, São Paulo State University (UNESP), Araçatuba, SP, Brazil
| | | | - Rafael Rodrigues Lima
- Laboratory of Functional and Structural Biology, Institute of Biological Sciences, Federal University of Pará, Belém, PA, Brazil
- * E-mail:
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Quadros IPS, Madeira NN, Loriato VAP, Saia TFF, Silva JC, Soares FAF, Carvalho JR, Reis PAB, Fontes EPB, Clarindo WR, Fontes RLF. Cadmium-mediated toxicity in plant cells is associated with the DCD/NRP-mediated cell death response. PLANT, CELL & ENVIRONMENT 2022; 45:556-571. [PMID: 34719793 DOI: 10.1111/pce.14218] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2020] [Revised: 09/08/2021] [Accepted: 09/16/2021] [Indexed: 05/13/2023]
Abstract
Cadmium (Cd2+ ) is highly harmful to plant growth. Although Cd2+ induces programmed cell death (PCD) in plant cells, Cd2+ stress in whole plants during later developmental stages and the mechanism underlying Cd2+ -mediated toxicity are poorly understood. Here, we showed that Cd2+ limits plant growth, causes intense redness in leaf vein, leaf yellowing, and chlorosis during the R1 reproductive stage of soybean (Glycine max). These symptoms were associated with Cd2+ -induced PCD, as Cd2+ -stressed soybean leaves displayed decreased number of nuclei, enhanced cell death, DNA damage, and caspase 1 activity compared to unstressed leaves. Accordingly, Cd2+ -induced NRPs, GmNAC81, GmNAC30 and VPE, the DCD/NRP-mediated cell death signalling components, which execute PCD via caspase 1-like VPE activity. Furthermore, overexpression of the positive regulator of this cell death signalling GmNAC81 enhanced sensitivity to Cd2+ stress and intensified the hallmarks of Cd2+ -mediated PCD. GmNAC81 overexpression enhanced Cd2+ -induced H2 O2 production, cell death, DNA damage, and caspase-1-like VPE expression. Conversely, BiP overexpression negatively regulated the NRPs/GmNACs/VPE signalling module, conferred tolerance to Cd2+ stress and reduced Cd2+ -mediated cell death. Collectively, our data indicate that Cd2+ induces PCD in plants via activation of the NRP/GmNAC/VPE regulatory circuit that links developmentally and stress-induced cell death.
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Affiliation(s)
- Iana Pedro Silva Quadros
- National Institute of Science and Technology in Plant-Pest Interactions, Bioagro, Universidade Federal de Viçosa, Viçosa, Brazil
| | | | - Virgílio Adriano Pereira Loriato
- National Institute of Science and Technology in Plant-Pest Interactions, Bioagro, Universidade Federal de Viçosa, Viçosa, Brazil
- Biochemistry and Molecular Biology Department/BIOAGRO, Universidade Federal de Viçosa, Viçosa, Brazil
| | - Thaina Fernanda Fillietaz Saia
- National Institute of Science and Technology in Plant-Pest Interactions, Bioagro, Universidade Federal de Viçosa, Viçosa, Brazil
| | - Jéssica Coutinho Silva
- Cytogenetics and Cytometry Laboratory, Department of General Biology, Universidade Federal de Viçosa, Viçosa, Brazil
| | | | | | - Pedro Augusto Braga Reis
- National Institute of Science and Technology in Plant-Pest Interactions, Bioagro, Universidade Federal de Viçosa, Viçosa, Brazil
- Biochemistry and Molecular Biology Department/BIOAGRO, Universidade Federal de Viçosa, Viçosa, Brazil
| | - Elizabeth P B Fontes
- National Institute of Science and Technology in Plant-Pest Interactions, Bioagro, Universidade Federal de Viçosa, Viçosa, Brazil
- Biochemistry and Molecular Biology Department/BIOAGRO, Universidade Federal de Viçosa, Viçosa, Brazil
| | - Wellington Ronildo Clarindo
- Cytogenetics and Cytometry Laboratory, Department of General Biology, Universidade Federal de Viçosa, Viçosa, Brazil
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Costa NLB, Carvalho CR, Clarindo WR. Improved Procedures to Assess Plant Protoplast Viability: Evidencing Cytological and Genomic Damage. CYTOLOGIA 2018. [DOI: 10.1508/cytologia.83.397] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- Natália Layane Badaró Costa
- Laboratório de Citogenética e Citometria, Departamento de Biologia Geral, Centro de Ciências Biológicas e da Saúde, Universidade Federal de Viçosa
| | - Carlos Roberto Carvalho
- Laboratório de Citogenética e Citometria, Departamento de Biologia Geral, Centro de Ciências Biológicas e da Saúde, Universidade Federal de Viçosa
| | - Wellington Ronildo Clarindo
- Laboratório de Citogenética, Departamento de Biologia, Campus de Alegre, Universidade Federal do Espírito Santo
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4
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He K, Liang X, Wei T, Liu N, Wang Y, Zou L, Lu J, Yao Y, Kong L, Zhang T, Xue Y, Wu T, Tang M. DNA damage in BV-2 cells: An important supplement to the neurotoxicity of CdTe quantum dots. J Appl Toxicol 2018; 39:525-539. [DOI: 10.1002/jat.3745] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2018] [Revised: 09/28/2018] [Accepted: 10/03/2018] [Indexed: 01/23/2023]
Affiliation(s)
- Keyu He
- Key Laboratory of Environmental Medicine and Engineering, Ministry of Education; School of Public Health, & Collaborative Innovation Center of Suzhou Nano Science and Technology; Southeast University; Nanjing 210009 China
- Jiangsu Key Laboratory for Biomaterials and Devices; Southeast University; Nanjing 210009 China
| | - Xue Liang
- Key Laboratory of Environmental Medicine and Engineering, Ministry of Education; School of Public Health, & Collaborative Innovation Center of Suzhou Nano Science and Technology; Southeast University; Nanjing 210009 China
- Jiangsu Key Laboratory for Biomaterials and Devices; Southeast University; Nanjing 210009 China
| | - Tingting Wei
- Key Laboratory of Environmental Medicine and Engineering, Ministry of Education; School of Public Health, & Collaborative Innovation Center of Suzhou Nano Science and Technology; Southeast University; Nanjing 210009 China
- Jiangsu Key Laboratory for Biomaterials and Devices; Southeast University; Nanjing 210009 China
| | - Na Liu
- Key Laboratory of Environmental Medicine and Engineering, Ministry of Education; School of Public Health, & Collaborative Innovation Center of Suzhou Nano Science and Technology; Southeast University; Nanjing 210009 China
- Jiangsu Key Laboratory for Biomaterials and Devices; Southeast University; Nanjing 210009 China
| | - Yan Wang
- Key Laboratory of Environmental Medicine and Engineering, Ministry of Education; School of Public Health, & Collaborative Innovation Center of Suzhou Nano Science and Technology; Southeast University; Nanjing 210009 China
- Jiangsu Key Laboratory for Biomaterials and Devices; Southeast University; Nanjing 210009 China
| | - Linyue Zou
- Key Laboratory of Environmental Medicine and Engineering, Ministry of Education; School of Public Health, & Collaborative Innovation Center of Suzhou Nano Science and Technology; Southeast University; Nanjing 210009 China
- Jiangsu Key Laboratory for Biomaterials and Devices; Southeast University; Nanjing 210009 China
| | - Jie Lu
- Key Laboratory of Environmental Medicine and Engineering, Ministry of Education; School of Public Health, & Collaborative Innovation Center of Suzhou Nano Science and Technology; Southeast University; Nanjing 210009 China
- Jiangsu Key Laboratory for Biomaterials and Devices; Southeast University; Nanjing 210009 China
| | - Ying Yao
- Key Laboratory of Environmental Medicine and Engineering, Ministry of Education; School of Public Health, & Collaborative Innovation Center of Suzhou Nano Science and Technology; Southeast University; Nanjing 210009 China
- Jiangsu Key Laboratory for Biomaterials and Devices; Southeast University; Nanjing 210009 China
| | - Lu Kong
- Key Laboratory of Environmental Medicine and Engineering, Ministry of Education; School of Public Health, & Collaborative Innovation Center of Suzhou Nano Science and Technology; Southeast University; Nanjing 210009 China
- Jiangsu Key Laboratory for Biomaterials and Devices; Southeast University; Nanjing 210009 China
| | - Ting Zhang
- Key Laboratory of Environmental Medicine and Engineering, Ministry of Education; School of Public Health, & Collaborative Innovation Center of Suzhou Nano Science and Technology; Southeast University; Nanjing 210009 China
- Jiangsu Key Laboratory for Biomaterials and Devices; Southeast University; Nanjing 210009 China
| | - Yuying Xue
- Key Laboratory of Environmental Medicine and Engineering, Ministry of Education; School of Public Health, & Collaborative Innovation Center of Suzhou Nano Science and Technology; Southeast University; Nanjing 210009 China
- Jiangsu Key Laboratory for Biomaterials and Devices; Southeast University; Nanjing 210009 China
| | - Tianshu Wu
- Key Laboratory of Environmental Medicine and Engineering, Ministry of Education; School of Public Health, & Collaborative Innovation Center of Suzhou Nano Science and Technology; Southeast University; Nanjing 210009 China
- Jiangsu Key Laboratory for Biomaterials and Devices; Southeast University; Nanjing 210009 China
| | - Meng Tang
- Key Laboratory of Environmental Medicine and Engineering, Ministry of Education; School of Public Health, & Collaborative Innovation Center of Suzhou Nano Science and Technology; Southeast University; Nanjing 210009 China
- Jiangsu Key Laboratory for Biomaterials and Devices; Southeast University; Nanjing 210009 China
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5
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Liu Z, Li G, Long C, Xu J, Cen J, Yang X. The antioxidant activity and genotoxicity of isogarcinol. Food Chem 2018; 253:5-12. [PMID: 29502843 DOI: 10.1016/j.foodchem.2018.01.074] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2017] [Revised: 12/07/2017] [Accepted: 01/09/2018] [Indexed: 02/06/2023]
Abstract
The antioxidant activity and genotoxicity of isogarcinol were assessed by several in vitro tests. Its IC50 values for DPPH and ABTS were 36.3 ± 3.35 µM and 16.6 ± 3.98 µM, respectively, which were all lower than those of VC and BHT. Isogarcinol had no cyctotoxic or promotional activities at 1-10 µM in the CCK-8 assay, and negligible genotoxic effects at 50-500 µM on HepG2 cells by the single-cell gel electrophoresis assay. Pre-incubation of the cells with 0.5-1.5 µM isogarcinol, before exposure to H2O2, significantly increased cell viability in a concentration-dependent manner. Isogarcinol also reduced intercellular reactive oxygen species accumulation, lactate dehydrogenase release and malondialdehyde levels, and increased superoxide dismutase activity and glutathione levels. Western-blot analysis revealed that it up-regulated pro-caspase-3 and reduced cleaved caspase-3 during H2O2-induced oxidative stress. All the above results indicate that isogarcinol promises to be useful as a natural antioxidant.
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Affiliation(s)
- Zijin Liu
- Institute of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, People's Republic of China; Beijing Key Laboratory of Gene Resource and Molecular Development, College of Life Sciences, Beijing Normal University, Beijing 100875, People's Republic of China
| | - Gang Li
- College of Materials and Chemical Engineering, Hainan University, Haikou 570228, People's Republic of China
| | - Cheng Long
- Institute of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, People's Republic of China
| | - Jing Xu
- College of Materials and Chemical Engineering, Hainan University, Haikou 570228, People's Republic of China
| | - Juren Cen
- Institute of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, People's Republic of China.
| | - Xiaobo Yang
- Institute of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, People's Republic of China.
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6
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Zhang LJ, Li Y, Chen P, Li XM, Chen YG, Hang YY, Gong WJ. A study of genotoxicity and oxidative stress induced by mercuric chloride in the marine polychaete Perinereis aibuhitensis. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2017; 56:361-365. [PMID: 29126054 DOI: 10.1016/j.etap.2017.10.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2017] [Revised: 10/11/2017] [Accepted: 10/17/2017] [Indexed: 06/07/2023]
Abstract
The marine polychaete worm Perinereis aibuhitensis was used to study the genotoxic effects of mercuric chloride by means of the comet assay and micronucleus (MN) test. P. aibuhitensis was subjected in vivo to two different concentrations of mercuric chloride (0.05mgL-1 and 0.5mgL-1) for 96h. The comet assay of coelomocytes demonstrated that TailDNA% values increased with extended exposure to or increased concentrations of HgCl2 (p<0.01). The frequency of MNs was the highest in the treatment with 96h of exposure at all concentrations (p<0.01). The genotoxic effect of HgCl2 was both dose- and time-dependent in exposed P. aibuhitensis. The activities of the antioxidant enzymes, superoxide dismutase (SOD) and glutathione peroxidases (GPx) were also estimated. Significant variations in antioxidant enzyme activities depended on the sampling time and the concentrations of mercuric chloride. Compared with the control, the activities of the antioxidant enzymes (SOD and GPx) were elevated at the lower concentration of mercuric chloride (0.05mg L-1) (p<0.05) for shorter exposure periods (24h and 72h). At the higher concentration of mercury (0.5mgL-1), the activities of GPx and SOD were inhibited; no variation was observed. These results proved that the use of the comet assay and MN test in coelomocytes of P. aibuhitensis is appropriate for determining the levels of DNA damage and that P. aibuhitensis is a species that is sensitive to mercury pollutants. This species may be considered a suitable candidate for monitoring marine heavy metal pollution.
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Affiliation(s)
- Lai Jun Zhang
- College of Life Sciences and Ecology, Tropical Ocean College of Hainan, Sanya, 572022, Hainan Province, China.
| | - Yao Li
- Navigation College, Guangdong Ocean University, Zhanjiang 524025, Guangdong Province, China
| | - Pan Chen
- College of Life Sciences and Ecology, Tropical Ocean College of Hainan, Sanya, 572022, Hainan Province, China
| | - Xiao Mei Li
- College of Life Sciences and Ecology, Tropical Ocean College of Hainan, Sanya, 572022, Hainan Province, China
| | - Yong Gan Chen
- College of Life Sciences and Ecology, Tropical Ocean College of Hainan, Sanya, 572022, Hainan Province, China
| | - Yu Yu Hang
- College of Life Sciences and Ecology, Tropical Ocean College of Hainan, Sanya, 572022, Hainan Province, China
| | - Wei Jie Gong
- College of Life Sciences and Ecology, Tropical Ocean College of Hainan, Sanya, 572022, Hainan Province, China
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7
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Zuo B, Zheng X, He P, Wang L, Lei Q, Feng C, Zhou J, Li Q, Han Z, Kong J. Overexpression of MzASMT improves melatonin production and enhances drought tolerance in transgenic Arabidopsis thaliana plants. J Pineal Res 2014; 57:408-17. [PMID: 25250844 DOI: 10.1111/jpi.12180] [Citation(s) in RCA: 161] [Impact Index Per Article: 16.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/06/2014] [Accepted: 09/19/2014] [Indexed: 12/20/2022]
Abstract
Melatonin is a potent naturally occurring reactive oxygen species (ROS) and reactive nitrogen species (RNS) scavenger in plants. Melatonin protects plants from oxidative stress and, therefore, it improves their tolerance against a variety of environmental abiotic stressors. N-acetylserotonin-O-methyltransferase (ASMT) is a specific enzyme required for melatonin synthesis. In this report, an ASMT gene was cloned from apple rootstock (Malus zumi Mats) and designated as MzASMT1 (KJ123721). The MzASMT1 expression was induced by drought stress in apple leaves. The upregulation of MzASMT1 in the apple leaf positively relates to melatonin production over a 24-hr dark/light cycle. Purified MzASMT1 protein expressed in E. coli converted its substrates to melatonin with an activity of approximately 5.5 pmol/min/mg protein. The transient transformation in tobacco identified that MzASMT1 is located in cytoplasm of the cell. When MzASMT1 gene driven by 35S promoter was transferred to Arabidopsis, melatonin levels in transgenic Arabidopsis plants were 2-4 times higher than those in the wild type. The transgenic Arabidopsis plants had significantly lower intrinsic ROS than the wild type and therefore these plants exhibited greater tolerance to drought stress than that of wild type. This is, at least partially, attributed to the elevated melatonin levels resulting from the overexpression of MzASMT1. The results elucidated the important role that membrane-located melatonin synthase plays in drought tolerance. These findings have significant implications in agriculture.
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Affiliation(s)
- Bixiao Zuo
- Institute for Horticultural Plants, China Agricultural University, Beijing, China
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8
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Brunborg G, Jackson P, Shaposhnikov S, Dahl H, Azqueta A, Collins AR, Gutzkow KB. High throughput sample processing and automated scoring. Front Genet 2014; 5:373. [PMID: 25389434 PMCID: PMC4211552 DOI: 10.3389/fgene.2014.00373] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2014] [Accepted: 10/06/2014] [Indexed: 01/01/2023] Open
Abstract
The comet assay is a sensitive and versatile method for assessing DNA damage in cells. In the traditional version of the assay, there are many manual steps involved and few samples can be treated in one experiment. High throughput (HT) modifications have been developed during recent years, and they are reviewed and discussed. These modifications include accelerated scoring of comets; other important elements that have been studied and adapted to HT are cultivation and manipulation of cells or tissues before and after exposure, and freezing of treated samples until comet analysis and scoring. HT methods save time and money but they are useful also for other reasons: large-scale experiments may be performed which are otherwise not practicable (e.g., analysis of many organs from exposed animals, and human biomonitoring studies), and automation gives more uniform sample treatment and less dependence on operator performance. The HT modifications now available vary largely in their versatility, capacity, complexity, and costs. The bottleneck for further increase of throughput appears to be the scoring.
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Affiliation(s)
- Gunnar Brunborg
- Department of Chemicals and Radiation, Division of Environmental Medicine, Norwegian Institute of Public HealthOslo, Norway
| | - Petra Jackson
- National Research Centre for the Working EnvironmentCopenhagen, Denmark
| | - Sergey Shaposhnikov
- Department of Nutrition, University of OsloOslo, Norway
- NorGenoTech AS, SkreiaNorway
| | - Hildegunn Dahl
- Department of Chemicals and Radiation, Division of Environmental Medicine, Norwegian Institute of Public HealthOslo, Norway
| | - Amaya Azqueta
- Department of Pharmacology and Toxicology, University of NavarraPamplona, Spain
| | | | - Kristine B. Gutzkow
- Department of Chemicals and Radiation, Division of Environmental Medicine, Norwegian Institute of Public HealthOslo, Norway
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Wang L, Zhao Y, Reiter RJ, He C, Liu G, Lei Q, Zuo B, Zheng XD, Li Q, Kong J. Changes in melatonin levels in transgenic 'Micro-Tom' tomato overexpressing ovine AANAT and ovine HIOMT genes. J Pineal Res 2014; 56:134-42. [PMID: 24138427 DOI: 10.1111/jpi.12105] [Citation(s) in RCA: 129] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/17/2013] [Accepted: 10/16/2013] [Indexed: 02/05/2023]
Abstract
In animals, the melatonin biosynthesis pathway has been well defined after the isolation and identification of the four key genes that are involved in the conversion of tryptophan to melatonin. In plants, there are special alternative catalyzing steps, and plant genes share very low homology with the animal genes. It was of interest to examine the phenotype of transgenic Micro-Tom tomato plants overexpressing the homologous sheep oAANAT and oHIOMT genes responsible for the last two steps of melatonin synthesis. The oAANAT transgenic plants have higher melatonin levels and lower indoleacetic acid (IAA) contents than control due to the competition for tryptophan, the same precursor for both melatonin and IAA. Therefore, the oAANAT lines lose the 'apical dominance' inferring that melatonin likely lacks auxin activity. The significantly higher melatonin content in oHIOMT lines than oAANAT lines provides new proof for the important role of ASMT in plant melatonin synthesis. In addition, the enhanced drought tolerance of oHIOMT lines will also be an important contribution for plant engineering.
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Affiliation(s)
- Lin Wang
- Institute for Horticultural Plants, China Agricultural University, Beijing, China
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10
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Lei Q, Wang L, Tan DX, Zhao Y, Zheng XD, Chen H, Li QT, Zuo BX, Kong J. Identification of genes for melatonin synthetic enzymes in 'Red Fuji' apple (Malus domestica Borkh.cv.Red) and their expression and melatonin production during fruit development. J Pineal Res 2013; 55:443-51. [PMID: 24102635 DOI: 10.1111/jpi.12096] [Citation(s) in RCA: 77] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/22/2013] [Accepted: 09/12/2013] [Indexed: 01/15/2023]
Abstract
Melatonin is present in many edible fruits; however, the presence of melatonin in apple has not previously been reported. In this study, the genes for melatonin synthetic enzymes including tryptophan decarboxylase, tryptamine 5-hydroxylase (T5H), arylalkylamine N-acetyltransferase, and N-acetylserotonin methyltransferase were identified in 'Red Fuji' apple. Each gene has several homologous genes. Sequence analysis shows that these genes have little homology with those of animals and they only have limited homology with known genes of rice melatonin synthetic enzymes. Multiple origins of melatonin synthetic genes during the evolution are expected. The expression of these genes is fully coordinated with melatonin production in apple development. Melatonin levels in apple exhibit an inverse relationship with the content of malondialdehyde, a product of lipid peroxidation. Two major melatonin synthetic peaks appeared on July 17 and on October 8 in both unbagged and bagged apple samples. At the periods mentioned above, apples experienced rapid expansion and increased respiration. These episodes significantly elevate reactive oxygen species production in the apple. Current data further confirmed that melatonin produced in apple was used to neutralize the toxic oxidants and protect the developing apple against oxidative stress.
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Affiliation(s)
- Qiong Lei
- College of Agriculture and Biotechnology, China Agricultural University, Beijing, China
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11
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Gutzkow KB, Langleite TM, Meier S, Graupner A, Collins AR, Brunborg G. High-throughput comet assay using 96 minigels. Mutagenesis 2013; 28:333-40. [PMID: 23462850 DOI: 10.1093/mutage/get012] [Citation(s) in RCA: 77] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
The single-cell gel electrophoresis--the comet assay--has proved to be a sensitive and relatively simple method that is much used in research for the analysis of specific types of DNA damage, and its use in genotoxicity testing is increasing. The efficiency of the comet assay, in terms of number of samples processed per experiment, has been rather poor, and both research and toxicological testing should profit from an increased throughput. We have designed and validated a format involving 96 agarose minigels supported by a hydrophilic polyester film. Using simple technology, hundreds of samples may be processed in one experiment by one person, with less time needed for processing, less use of chemicals and requiring fewer cells per sample. Controlled electrophoresis, including circulation of the electrophoresis solution, improves the homogeneity between replicate samples in the 96-minigel format. The high-throughput method described in this paper should greatly increase the overall capacity, versatility and robustness of the comet assay.
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Affiliation(s)
- Kristine B Gutzkow
- Department of Chemicals and Radiation, National Institute of Public Health, PO Box 4404 Nydalen, Oslo N-0403, Norway
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12
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Tan DX, Hardeland R, Manchester LC, Rosales-Corral S, Coto-Montes A, Boga JA, Reiter RJ. Emergence of naturally occurring melatonin isomers and their proposed nomenclature. J Pineal Res 2012; 53:113-21. [PMID: 22332602 DOI: 10.1111/j.1600-079x.2012.00979.x] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Melatonin was considered to be the sole member of this natural family. The emergence of naturally occurring melatonin isomers (MIs) has opened an exciting new research area. Currently, several MIs have been identified in wine, and these molecules are believed to be synthesized by either yeasts or bacteria. A tentative nomenclature for the MIs is proposed in this article. It will be important to explore whether all organisms have the capacity to synthesize MIs, especially under the conditions of environmental stress. These isomers probably share many of the biological functions of melatonin, but their activities seem to exceed those of melatonin. On basis of the limited available information, it seems that MIs differ in their biosynthetic pathways from melatonin. Especially in those compounds in which the aliphatic side chain is not attached to ring atom 3, the starting material may not be tryptophan. Also, the metabolic pathways of MIs remain unknown. This, therefore, is another promising area of research to explore. It is our hypothesis that MIs would increase the performance of yeasts and probiotic bacteria during the processes of fermentation. Therefore, yeasts producing elevated levels of these isomers might have a superior alcohol tolerance and be able to produce higher levels of alcohol. This can be tested by comparing existing yeast strains differing in alcohol tolerance. Selection for MIs may become a strategy for isolating more resistant yeast and Lactobacillus strains, which can be of interest for industrial alcohol production and quality improvements in bacterially fermented foods such as kimchi.
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Affiliation(s)
- Dun-Xian Tan
- Department of Cellular and Structural Biology, The University of Texas, Health Science Center at San Antonio, San Antonio, TX 78229, USA.
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Tan DX, Hardeland R, Manchester LC, Korkmaz A, Ma S, Rosales-Corral S, Reiter RJ. Functional roles of melatonin in plants, and perspectives in nutritional and agricultural science. JOURNAL OF EXPERIMENTAL BOTANY 2012; 63:577-97. [PMID: 22016420 DOI: 10.1093/jxb/err256] [Citation(s) in RCA: 346] [Impact Index Per Article: 28.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
The presence of melatonin in plants is universal. Evidence has confirmed that a major portion of the melatonin is synthesized by plants themselves even though a homologue of the classic arylalkylamine N-acetyltransferase (AANAT) has not been identified as yet in plants. Thus, the serotonin N-acetylating enzyme in plants may differ greatly from the animal AANAT with regard to sequence and structure. This would imply multiple evolutionary origins of enzymes with these catalytic properties. A primary function of melatonin in plants is to serve as the first line of defence against internal and environmental oxidative stressors. The much higher melatonin levels in plants compared with those found in animals are thought to be a compensatory response by plants which lack means of mobility, unlike animals, as a means of coping with harsh environments. Importantly, remarkably high melatonin concentrations have been measured in popular beverages (coffee, tea, wine, and beer) and crops (corn, rice, wheat, barley, and oats). Billions of people worldwide consume these products daily. The beneficial effects of melatonin on human health derived from the consumption of these products must be considered. Evidence also indicates that melatonin has an ability to increase the production of crops. The mechanisms may involve the roles of melatonin in preservation of chlorophyll, promotion of photosynthesis, and stimulation of root development. Transgenic plants with enhanced melatonin content could probably lead to breakthroughs to increase crop production in agriculture and to improve the general health of humans.
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Affiliation(s)
- Dun-Xian Tan
- Department of Cellular and Structural Biology, The University of Texas, Health Science Center at San Antonio, 7703 Floyd Curl, San Antonio, TX 78229, USA.
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