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Saejiw N, Choosong T, Sathirapanya C, Ngamchaliew P, Senthong P, Surasombatpattana S, Yingkajorn M, Pipithsuntornsan N, Chusri S, Vongkamjan K. The Strengths and Advantages of SARS-CoV-2 Management of a Southern University Hospital in Thailand. Asia Pac J Public Health 2024:10105395241240969. [PMID: 38577731 DOI: 10.1177/10105395241240969] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/06/2024]
Affiliation(s)
- Nutjaree Saejiw
- Faculty of Science and Industrial Technology, Prince of Songkla University, Surat Thani, Thailand
| | | | | | | | - Pattama Senthong
- Faculty of Science and Industrial Technology, Prince of Songkla University, Surat Thani, Thailand
| | | | | | | | - Sarunyou Chusri
- Faculty of Medicine, Prince of Songkla University, Songkhla, Thailand
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Abdelhady R, Senthong P, Eyers CE, Reamtong O, Cowley E, Cannizzaro L, Stimpson J, Cain K, Wilkinson OJ, Williams NH, Barran PE, Margison GP, Williams DM, Povey AC. Mass Spectrometric Analysis of the Active Site Tryptic Peptide of Recombinant O6-Methylguanine-DNA Methyltransferase Following Incubation with Human Colorectal DNA Reveals the Presence of an O6-Alkylguanine Adductome. Chem Res Toxicol 2023; 36:1921-1929. [PMID: 37983188 PMCID: PMC10731659 DOI: 10.1021/acs.chemrestox.3c00207] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Revised: 10/31/2023] [Accepted: 11/01/2023] [Indexed: 11/22/2023]
Abstract
Human exposure to DNA alkylating agents is poorly characterized, partly because only a limited range of specific alkyl DNA adducts have been quantified. The human DNA repair protein, O6-methylguanine O6-methyltransferase (MGMT), irreversibly transfers the alkyl group from DNA O6-alkylguanines (O6-alkGs) to an acceptor cysteine, allowing the simultaneous detection of multiple O6-alkG modifications in DNA by mass spectrometric analysis of the MGMT active site peptide (ASP). Recombinant MGMT was incubated with oligodeoxyribonucleotides (ODNs) containing different O6-alkGs, Temozolomide-methylated calf thymus DNA (Me-CT-DNA), or human colorectal DNA of known O6-MethylG (O6-MeG) levels. It was digested with trypsin, and ASPs were detected and quantified by matrix-assisted laser desorption/ionization-time-of-flight mass spectrometry. ASPs containing S-methyl, S-ethyl, S-propyl, S-hydroxyethyl, S-carboxymethyl, S-benzyl, and S-pyridyloxobutyl cysteine groups were detected by incubating MGMT with ODNs containing the corresponding O6-alkGs. The LOQ of ASPs containing S-methylcysteine detected after MGMT incubation with Me-CT-DNA was <0.05 pmol O6-MeG per mg CT-DNA. Incubation of MGMT with human colorectal DNA produced ASPs containing S-methylcysteine at levels that correlated with those of O6-MeG determined previously by HPLC-radioimmunoassay (r2 = 0.74; p = 0.014). O6-CMG, a putative O6-hydroxyethylG adduct, and other potential unidentified MGMT substrates were also detected in human DNA samples. This novel approach to the identification and quantitation of O6-alkGs in human DNA has revealed the existence of a human DNA alkyl adductome that remains to be fully characterized. The methodology establishes a platform for characterizing the human DNA O6-alkG adductome and, given the mutagenic potential of O6-alkGs, can provide mechanistic information about cancer pathogenesis.
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Affiliation(s)
- Rasha Abdelhady
- Epidemiology
and Public Health Group, Division of Population Health, Health Services
Research and Primary Care, School of Health Sciences, Faculty of Biology,
Medicine and Health, University of Manchester, Manchester M13 9PL, U.K.
| | - Pattama Senthong
- Epidemiology
and Public Health Group, Division of Population Health, Health Services
Research and Primary Care, School of Health Sciences, Faculty of Biology,
Medicine and Health, University of Manchester, Manchester M13 9PL, U.K.
| | - Claire E. Eyers
- Department
of Chemistry and Manchester Institute of Biotechnology, University of Manchester, Manchester M1 7DN, U.K.
| | - Onrapak Reamtong
- Department
of Chemistry and Manchester Institute of Biotechnology, University of Manchester, Manchester M1 7DN, U.K.
| | - Elizabeth Cowley
- Epidemiology
and Public Health Group, Division of Population Health, Health Services
Research and Primary Care, School of Health Sciences, Faculty of Biology,
Medicine and Health, University of Manchester, Manchester M13 9PL, U.K.
| | - Luca Cannizzaro
- Department
of Chemistry and Manchester Institute of Biotechnology, University of Manchester, Manchester M1 7DN, U.K.
| | - Joanna Stimpson
- Department
of Chemistry and Manchester Institute of Biotechnology, University of Manchester, Manchester M1 7DN, U.K.
| | - Kathleen Cain
- Department
of Chemistry and Manchester Institute of Biotechnology, University of Manchester, Manchester M1 7DN, U.K.
| | - Oliver J. Wilkinson
- Centre
for Chemical Biology, Department of Chemistry, Sheffield Institute
for Nucleic Acids, University of Sheffield, Sheffield S3 7HF, U.K.
| | - Nicholas H. Williams
- Centre
for Chemical Biology, Department of Chemistry, Sheffield Institute
for Nucleic Acids, University of Sheffield, Sheffield S3 7HF, U.K.
| | - Perdita E. Barran
- Department
of Chemistry and Manchester Institute of Biotechnology, University of Manchester, Manchester M1 7DN, U.K.
| | - Geoffrey P. Margison
- Epidemiology
and Public Health Group, Division of Population Health, Health Services
Research and Primary Care, School of Health Sciences, Faculty of Biology,
Medicine and Health, University of Manchester, Manchester M13 9PL, U.K.
| | - David M. Williams
- Centre
for Chemical Biology, Department of Chemistry, Sheffield Institute
for Nucleic Acids, University of Sheffield, Sheffield S3 7HF, U.K.
| | - Andrew C. Povey
- Epidemiology
and Public Health Group, Division of Population Health, Health Services
Research and Primary Care, School of Health Sciences, Faculty of Biology,
Medicine and Health, University of Manchester, Manchester M13 9PL, U.K.
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Senthong P, Wittayasilp S. Working Conditions and Health Risk Assessment in Hair Salons. Environ Health Insights 2021; 15:11786302211026772. [PMID: 34248357 PMCID: PMC8239987 DOI: 10.1177/11786302211026772] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Accepted: 06/02/2021] [Indexed: 06/13/2023]
Abstract
Objective:The aim of this study was to assess the chemical and physical work conditions in hair salons and to analyze health risk of exposure to VOCs for the hairdressers of hair salons. Methods: This study was carried out at 4 selected hair salons close to universities in Surat Thani province, Thailand. VOCs were collected by area sampling using charcoal tubes (9 samples per salon). The air samples were analyzed using GC/FID. The noise levels, illumination, and temperature were measured by using sound level meter, lux meter, and WBGT, respectively. Results: Toluene, cyclohexanone, xylene, and hexane were the most frequently found across the hair salons. All of the VOCs concentration was highest in the mixing area. All of hair salons had cancer risk exceeding 1 × 10-6 and HI > 1.0, indicating that indoor air pollution may affect hairdresser's health. The average VOCs concentrations after installation of local exhaust ventilation and open the door for 30 minutes before closing the hair salon, was significantly lower than before and after installation of the local exhaust ventilation. The WBGT indoors varied within 22 to 28°C, sound pressure levels within 71 to 76 dBA, and illumination within 70 to 400 lux. The noise levels and temperature in the hair salons were satisfactory on the scale of the Ministry of Labor (Thailand). Conclusions:Installing and using proper ventilation in hair salon are recommended to eliminate health effects. Hairdresser worked in poor lighting that should be improved to appropriate levels (>1000 lux).
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Affiliation(s)
- Pattama Senthong
- Faculty of Science and Industrial Technology, Prince of Songkla University, Surat Thani, Thailand
| | - Sivasit Wittayasilp
- Faculty of Engineering, Department of Industrial Engineering, Prince of Songkla University, Hat Yai, Songkhla, Thailand
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Abdu K, Aiertza MK, Wilkinson OJ, Senthong P, Craggs TD, Povey AC, Margison GP, Williams DM. Synthesis of oligodeoxyribonucleotides containing a tricyclic thio analogue of O6-methylguanine and their recognition by MGMT and Atl1. Nucleosides Nucleotides Nucleic Acids 2020; 39:1108-1121. [PMID: 32449465 DOI: 10.1080/15257770.2020.1764971] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Promutagenic O6-alkylguanine adducts in DNA are repaired in humans by O6-methylguanine-DNA-methyltransferase (MGMT) in an irreversible reaction. Here we describe the synthesis of a phosphoramidite that allows the preparation of oligodeoxyribonucleotides (ODNs) containing a novel tricyclic thio analogue of O6-methylguanine in which the third ring bridges the 6-thio group and C7 of a 7-deazapurine. These ODNs are very poor substrates for MGMT and poorly recognised by the alkyltransferase-like protein, Atl1. Examination of the active sites of both MGMT and Atl1 suggest large steric clashes hindering binding of the analogue. Such analogues, if mutagenic, are likely to be highly toxic.
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Affiliation(s)
- Kabir Abdu
- Department of Pure and Industrial Chemistry, Faculty of Physical Sciences, Bayero University, Kano, Nigeria
| | - Miren K Aiertza
- Centre for Chemical Biology, Department of Chemistry, Sheffield Institute for Nucleic Acids, University of Sheffield, Sheffield, UK
| | - Oliver J Wilkinson
- Centre for Chemical Biology, Department of Chemistry, Sheffield Institute for Nucleic Acids, University of Sheffield, Sheffield, UK
| | | | - Timothy D Craggs
- Centre for Chemical Biology, Department of Chemistry, Sheffield Institute for Nucleic Acids, University of Sheffield, Sheffield, UK
| | - Andrew C Povey
- Centre of Epidemiology, Faculty of Biology, Medicine and Health
| | | | - David M Williams
- Centre for Chemical Biology, Department of Chemistry, Sheffield Institute for Nucleic Acids, University of Sheffield, Sheffield, UK
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Senthong P, Wittayasilp S. Measurements and health impacts of carbon black and BTEXs in photocopy centers. Arch Environ Occup Health 2018; 73:169-175. [PMID: 29116891 DOI: 10.1080/19338244.2017.1400940] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2017] [Accepted: 11/01/2017] [Indexed: 06/07/2023]
Abstract
The purpose of this study was to measure the concentration of carbon black and BTEXs at three photocopy centers and to assess the health risk following exposure. Air samples were collected by sampling in the breathing zone of workers during the class and examination periods. The results found that the concentration of carbon black before operation was higher than morning and afternoon in both class and examination periods. These levels are considerably lower than the suggested limited value set by OSHA. Toluene had the highest concentration but did not exceed of recommended exposure limit by NIOSH. The carbon black and toluene concentrations were higher in examination period than during the normal class period. The results from interview indicate that cough and sneeze are the highest symptom among workers. Carbon black and toluene concentrations in photocopy centers should be concerned in terms of indoor air quality and human health.
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Affiliation(s)
- Pattama Senthong
- a Faculty of Science and Industrial Technology , Prince of Songkla University, Surat Thani Campus , Muang , Surat Thani , Thailand
| | - Sivasit Wittayasilp
- b Faculty of Engineering, Department of Industrial Engineering , Prince of Songkla University , Hat Yai , Songkhla , Thailand
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Senthong P, Boriboon U. Evaluation of Occupational Exposure to Nitrosamine, Carbon Black and Dust in Rubber Processing Industry. Int J Occup Environ Med 2017; 8:181-3. [PMID: 28689215 PMCID: PMC6679626 DOI: 10.15171/ijoem.2017.1098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 05/30/2017] [Accepted: 06/24/2017] [Indexed: 11/09/2022]
Affiliation(s)
- Pattama Senthong
- Faculty of Science and Industrial Technology, Prince of Songkla University, Surat Thani Campus, Muang, Surat Thani, Thailand.
| | - Uma Boriboon
- Bureau of Quality and Safety of Food, Department of Medical Sciences, Ministry of Public Health, Nonthaburi, Thailand
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Senthong P, Millington CL, Wilkinson OJ, Marriott AS, Watson AJ, Reamtong O, Eyers CE, Williams DM, Margison GP, Povey AC. The nitrosated bile acid DNA lesion O6-carboxymethylguanine is a substrate for the human DNA repair protein O6-methylguanine-DNA methyltransferase. Nucleic Acids Res 2013; 41:3047-55. [PMID: 23335782 PMCID: PMC3597670 DOI: 10.1093/nar/gks1476] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
Abstract
The consumption of red meat is a risk factor in human colorectal cancer (CRC). One hypothesis is that red meat facilitates the nitrosation of bile acid conjugates and amino acids, which rapidly convert to DNA-damaging carcinogens. Indeed, the toxic and mutagenic DNA adduct O6-carboxymethylguanine (O6-CMG) is frequently present in human DNA, increases in abundance in people with high levels of dietary red meat and may therefore be a causative factor in CRC. Previous reports suggested that O6-CMG is not a substrate for the human version of the DNA damage reversal protein O6-methylguanine-DNA methyltransferase (MGMT), which protects against the genotoxic effects of other O6-alkylguanine lesions by removing alkyl groups from the O6-position. We now show that synthetic oligodeoxyribonucleotides containing the known MGMT substrate O6-methylguanine (O6-MeG) or O6-CMG effectively inactivate MGMT in vitro (IC50 0.93 and 1.8 nM, respectively). Inactivation involves the removal of the O6-alkyl group and its transfer to the active-site cysteine residue of MGMT. O6-CMG is therefore an MGMT substrate, and hence MGMT is likely to be a protective factor in CRC under conditions where O6-CMG is a potential causative agent.
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Affiliation(s)
- Pattama Senthong
- Centre for Occupational and Environmental Health, Faculty of Medical & Human Sciences, University of Manchester, Manchester M13 9PL, UK
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Abdu K, Aiertza MK, Wilkinson OJ, Grasby JA, Senthong P, Povey AC, Margison GP, Williams DM. Synthesis of oligodeoxyribonucleotides containing a conformationally-locked anti analogue of O6-methyl-2'-deoxyguanosine and their recognition by MGMT and Atl1. Chem Commun (Camb) 2012; 48:11214-6. [PMID: 23059787 DOI: 10.1039/c2cc36252j] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
We show that DNA containing a conformationally-locked anti analogue of O(6)-alkylguanine is a poor substrate for human O(6)-methylguanine-DNA methyltransferase (MGMT) and the alkyltransferase-like protein, Atl1. This highlights the requirement for the syn conformation and rationalises why certain O(6)-alkylguanines are poor MGMT substrates.
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Affiliation(s)
- Kabir Abdu
- Centre for Chemical Biology, Department of Chemistry, Krebs Institute, University of Sheffield, Sheffield, S3 7HF, UK
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Latypov VF, Tubbs JL, Watson AJ, Marriott AS, McGown G, Thorncroft M, Wilkinson OJ, Senthong P, Butt A, Arvai AS, Millington CL, Povey AC, Williams DM, Santibanez-Koref MF, Tainer JA, Margison GP. Atl1 regulates choice between global genome and transcription-coupled repair of O(6)-alkylguanines. Mol Cell 2012; 47:50-60. [PMID: 22658721 DOI: 10.1016/j.molcel.2012.04.028] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2012] [Revised: 04/05/2012] [Accepted: 04/20/2012] [Indexed: 11/20/2022]
Abstract
Nucleotide excision repair (NER) has long been known to remove DNA lesions induced by chemical carcinogens, and the molecular mechanism has been partially elucidated. Here we demonstrate that in Schizosaccharomyces pombe a DNA recognition protein, alkyltransferase-like 1 (Atl1), can play a pivotal role in selecting a specific NER pathway, depending on the nature of the DNA modification. The relative ease of dissociation of Atl1 from DNA containing small O(6)-alkylguanines allows accurate completion of global genome repair (GGR), whereas strong Atl1 binding to bulky O(6)-alkylguanines blocks GGR, stalls the transcription machinery, and diverts the damage to transcription-coupled repair. Our findings redraw the initial stages of the NER process in those organisms that express an alkyltransferase-like gene and raise the question of whether or not O(6)-alkylguanine lesions that are poor substrates for the alkyltransferase proteins in higher eukaryotes might, by analogy, signal such lesions for repair by NER.
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Affiliation(s)
- Vitaly F Latypov
- Cancer Research UK Carcinogenesis Group, Paterson Institute for Cancer Research, University of Manchester, Manchester M20 4BX, UK
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