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Komaki Y, Ono S, Okuya T, Ibuki Y. Glucose starvation impairs NER and γ-H2AX after UVB irradiation. Toxicol In Vitro 2023; 86:105503. [DOI: 10.1016/j.tiv.2022.105503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2022] [Revised: 09/12/2022] [Accepted: 10/17/2022] [Indexed: 11/07/2022]
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Tanaka M, Komaki Y, Toyooka T, Ibuki Y. Butyrate Enhances γ-H2AX Induced by Benzo[ a]pyrene. Chem Res Toxicol 2022; 35:2241-2251. [PMID: 36399157 DOI: 10.1021/acs.chemrestox.2c00238] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Benzo[a]pyrene (BaP) is known to form DNA adduct following metabolic activation, which causes phosphorylation of histone H2AX (γ-H2AX). Recent studies have shown that histone deacetylase (HDAC) inhibitors enhanced BaP-induced CYP1A1 gene expression. In this study, we examined the relationship between the HDAC inhibitor-augmented metabolic activation and BaP-induced γ-H2AX. Sodium butyrate (SB), a typical HDAC inhibitor, enhanced BaP-induced γ-H2AX. The enhanced DNA damage was further confirmed by biased sinusoidal field gel electrophoresis, which detects DNA double-strand breaks. SB remarkably augmented BaP-induced CYP1A1 gene expression, and CYP1A1-overexpressing cells showed elevated generation of γ-H2AX. Furthermore, SB enhanced intracellular oxidation after treatment with BaP. These results suggested that SB-induced CYP1A1 upregulation facilitated BaP metabolism, which might result in excess DNA adducts or oxidative DNA damages, leading to augmentation of γ-H2AX.
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Affiliation(s)
- Miki Tanaka
- Graduate Division of Nutritional and Environmental Sciences, University of Shizuoka, Yada 52-1, Suruga-ku, Shizuoka 422-8526, Japan
| | - Yukako Komaki
- Graduate Division of Nutritional and Environmental Sciences, University of Shizuoka, Yada 52-1, Suruga-ku, Shizuoka 422-8526, Japan
| | - Tatsushi Toyooka
- National Institute of Occupational Safety and Health, 6-21-1 Nagao, Tama-ku, Kawasaki 214-8585, Japan
| | - Yuko Ibuki
- Graduate Division of Nutritional and Environmental Sciences, University of Shizuoka, Yada 52-1, Suruga-ku, Shizuoka 422-8526, Japan
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3
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Komaki Y, Suganuma K, Ibuki Y. Protective role of electrophile-reactive glutathione for DNA damage repair inhibitory effect of dibromoacetonitrile. J Environ Sci (China) 2022; 117:305-314. [PMID: 35725084 DOI: 10.1016/j.jes.2022.05.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2022] [Revised: 05/05/2022] [Accepted: 05/06/2022] [Indexed: 06/15/2023]
Abstract
Dibromoacetonitrile (DBAN) is a disinfection byproduct (DBP) and linked with cancer in rodents, but the mechanism of its carcinogenicity has not been fully elucidated. We recently reported that DBAN induced inhibition of nucleotide excision repair (NER). In this study, we investigated if glutathione (GSH) is involved in the DBAN-induced inhibition of NER. Human keratinocytes HaCaT were pretreated with L-buthionine-(S,R)-sulfoximine (BSO) to deplete intracellular GSH. BSO treatment markedly potentiated the DBAN-induced NER inhibition as well as intracellular oxidation. The recruitment of NER proteins (transcription factor IIH, and xeroderma pigmentosum complementation group G) to DNA damage sites was inhibited by DBAN, which was further exacerbated by BSO treatment. Our results suggest that intracellular GSH protects cells from DBAN-induced genotoxicity including inhibition of DNA damage repair.
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Affiliation(s)
- Yukako Komaki
- Graduate Division of Nutritional and Environmental Sciences, University of Shizuoka, Shizuoka 422-8526, Japan.
| | - Koki Suganuma
- Graduate Division of Nutritional and Environmental Sciences, University of Shizuoka, Shizuoka 422-8526, Japan
| | - Yuko Ibuki
- Graduate Division of Nutritional and Environmental Sciences, University of Shizuoka, Shizuoka 422-8526, Japan
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4
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Komaki Y, Ibuki Y. Inhibition of nucleotide excision repair and damage response signaling by dibromoacetonitrile: A novel genotoxicity mechanism of a water disinfection byproduct. J Hazard Mater 2022; 423:127194. [PMID: 34844342 DOI: 10.1016/j.jhazmat.2021.127194] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [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: 07/24/2021] [Revised: 09/04/2021] [Accepted: 09/07/2021] [Indexed: 06/13/2023]
Abstract
Dibromoacetonitrile (DBAN) is a carcinogenic disinfection byproduct (DBP) but how it precipitates cancer is unknown. Nucleotide excision repair (NER) is a versatile repair mechanism for removing bulky DNA lesions to maintain genome stability, and impairment of this process is associated with cancer development. In this study, we found that DBAN inhibited NER and investigated its mechanism with other DNA damage responses. Human keratinocytes HaCaT were treated with DBAN followed by ultraviolet (UV) as a model inducer of DNA damage, pyrimidine dimers, which require NER for the removal. DBAN pretreatment exacerbated UV-cytotoxicity, and inhibited the repair of pyrimidine dimers. DBAN treatment delayed the recruitment of NER proteins, transcription factor IIH (TFIIH) and xeroderma pigmentosum complementation group G (XPG), to DNA damaged sites, and subsequent gap filling process. Moreover, DBAN suppressed the UV-induced double strand breaks (DSBs) formation, as well as phosphorylated histone H2AX (γ-H2AX), a widely used DNA damage marker. Altogether, DBAN could negatively impact the NER process and phosphorylation pathway responding to DNA damage. This study was the first to identify the inhibition of NER and damage response signaling as a genotoxicity mechanism of a class of DBPs and it may serve as a foundation for DBP carcinogenesis.
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Affiliation(s)
- Yukako Komaki
- Graduate Division of Nutritional and Environmental Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan.
| | - Yuko Ibuki
- Graduate Division of Nutritional and Environmental Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan.
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Shikata M, Toyooka T, Komaki Y, Ibuki Y. 4-(Methylnitrosamino)-1-(3-pyridyl)-1-butanone-Induced Histone Acetylation via α7nAChR-Mediated PI3K/Akt Activation and Its Impact on γ-H2AX Generation. Chem Res Toxicol 2021; 34:2512-2521. [PMID: 34784199 DOI: 10.1021/acs.chemrestox.1c00287] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
A typical tobacco-specific nitrosamine 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK) is known as a strong carcinogen. We previously reported that metabolized NNK induced histone H2AX phosphorylation (γ-H2AX), a DNA damage-induced histone modification. In this study, we found that NNK globally acetylated histone H3, which affected γ-H2AX generation. Human lung adenocarcinoma A549 was treated with several doses of NNK. NNK induced dose-dependent global histone H3 acetylation (Ac-H3), at 2 to 12 h after the treatment, independent of the cell cycle. The Ac-H3 pattern was not affected by CYP2A13 overexpression unlike γ-H2AX, indicating no requirement of NNK metabolism to induce Ac-H3. Immunofluorescence staining of Ac-H3 was uniform throughout the nucleus, whereas γ-H2AX was formed as foci and did not coincide with Ac-H3. Nicotinic receptor antagonist methyllycaconitine inhibited Ac-H3 and also γ-H2AX. Phosphoinositide-3-kinase (PI3K)/Akt inhibitors, LY294002, wortmannin, and GSK690693, also suppressed both Ac-H3 and γ-H2AX, whereas KU-55933, an inhibitor of ataxia telangiectasia mutated (ATM) upstream of γ-H2AX, inhibited γ-H2AX but not Ac-H3. These results suggested that binding of NNK to the nicotinic acetylcholine receptor (α7nAChR) activated the PI3K/Akt pathway, resulting in Ac-H3. The activated pathway leading to Ac-H3 enhanced γ-H2AX, suggesting that NNK-induced DNA damage is impacted by the α7nAChR-mediated signal transduction pathway.
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Affiliation(s)
- Mariko Shikata
- Graduate Division of Nutritional and Environmental Sciences, University of Shizuoka, Yada 52-1, Suruga-ku, Shizuoka 422-8526, Japan
| | - Tatsushi Toyooka
- National Institute of Occupational Safety and Health, 6-21-1 Nagao, Tama-ku, Kawasaki 214-8585, Japan
| | - Yukako Komaki
- Graduate Division of Nutritional and Environmental Sciences, University of Shizuoka, Yada 52-1, Suruga-ku, Shizuoka 422-8526, Japan
| | - Yuko Ibuki
- Graduate Division of Nutritional and Environmental Sciences, University of Shizuoka, Yada 52-1, Suruga-ku, Shizuoka 422-8526, Japan
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Fukuda T, Komaki Y, Mori Y, Ibuki Y. Low extracellular pH inhibits nucleotide excision repair. Mutat Res 2021; 867:503374. [PMID: 34266626 DOI: 10.1016/j.mrgentox.2021.503374] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2021] [Revised: 06/15/2021] [Accepted: 06/16/2021] [Indexed: 11/15/2022]
Abstract
Nucleotide excision repair (NER) is the main pathway to repair bulky DNA damages including pyrimidine dimers, and the genetic dysregulation of NER associated proteins is well known to cause diseases such as cancer and neurological disorder. Other than the genetic defects, 'external factors' such as oxidative stress and environmental chemicals also affect NER. In this study, we examined the impact of extracellular pH on NER. We prepared the culture media, whose pH values are 8.4 (normal condition), 7.6, 6.6 and 6.2 under atmospheric CO2 conditions. Human keratinocytes, HaCaT, slightly died after 48 h incubation in DMEM at pH 8.4, 7.6 and 6.6, while in pH 6.2 condition, marked cell death was induced. UV-induced pyrimidine dimers, pyrimidine (6-4) pyrimidone photoproducts (6-4PPs) and cyclobutane pyrimidine dimers (CPDs), were effectively repaired at 60 min and 24 h, respectively, which were remarkably inhibited at pH 6.6 and 6.2. The associated repair molecule, TFIIH, was accumulated to the damaged sites 5 min after UVC irradiation in all pH conditions, but the release was delayed as the pH got lower. Furthermore, accumulation of XPG at 5 min was delayed at pH 6.2 and 6.6, and the release at 60 min was completely suppressed. At the low pH, the DNA synthesis at the gaps created by incision of oligonucleotides containing pyrimidine dimers was significantly delayed. In this study, we found that the low extracellular pH inhibited NER pathway. This might partially contribute to carcinogenesis in inflamed tissues, which exhibit acidic pH.
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Affiliation(s)
- Tetsuya Fukuda
- Graduate Division of Nutritional and Environmental Sciences, University of Shizuoka, 52-1 Yada, Shizuoka 422-8526, Japan
| | - Yukako Komaki
- Graduate Division of Nutritional and Environmental Sciences, University of Shizuoka, 52-1 Yada, Shizuoka 422-8526, Japan
| | - Yuta Mori
- Graduate Division of Nutritional and Environmental Sciences, University of Shizuoka, 52-1 Yada, Shizuoka 422-8526, Japan
| | - Yuko Ibuki
- Graduate Division of Nutritional and Environmental Sciences, University of Shizuoka, 52-1 Yada, Shizuoka 422-8526, Japan.
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Ibuki Y, Komaki Y, Yang G, Toyooka T. Long-wavelength UVA enhances UVB-induced cell death in cultured keratinocytes: DSB formation and suppressed survival pathway. Photochem Photobiol Sci 2021; 20:639-652. [PMID: 33978941 DOI: 10.1007/s43630-021-00050-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Accepted: 04/28/2021] [Indexed: 11/30/2022]
Abstract
Solar UV radiation consists of both UVA and UVB. The wavelength-specific molecular responses to UV radiation have been studied, but the interaction between UVA and UVB has not been well understood. In this study, we found that long-wavelength UVA, UVA1, augmented UVB-induced cell death, and examined the underlying mechanisms. Human keratinocytes HaCaT were exposed to UVA1, followed by UVB irradiation. Irradiation by UVA1 alone showed no effect on cell survival, whereas the UVA1 pre-irradiation remarkably enhanced UVB-induced cell death. UVA1 delayed the repair of pyrimidine dimers formed by UVB and the accumulation of nucleotide excision repair (NER) proteins to damaged sites. Gap synthesis during NER was also decreased, suggesting that UVA1 delayed NER, and unrepaired pyrimidine dimers and single-strand breaks generated in the process of NER were left behind. Accumulation of this unrepaired DNA damage might have led to the formation of DNA double-strand breaks (DSBs), as was detected using gel electrophoresis analysis and phosphorylated histone H2AX assay. Combined exposure enhanced the ATM-Chk2 signaling pathway, but not the ATR-Chk1 pathway, confirming the enhanced formation of DSBs. Moreover, UVA1 suppressed the UVB-induced phosphorylation of Akt, a survival signal pathway. These results indicated that UVA1 influenced the repair of UVB-induced DNA damage, which resulted in the formation of DSBs and enhanced cell death, suggesting the risk of simultaneous exposure to high doses of UVA1 and UVB.
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Affiliation(s)
- Yuko Ibuki
- Graduate Division of Nutritional and Environmental Sciences, University of Shizuoka, 52-1 Yada, Shizuoka, 422-8526, Japan.
| | - Yukako Komaki
- Graduate Division of Nutritional and Environmental Sciences, University of Shizuoka, 52-1 Yada, Shizuoka, 422-8526, Japan
| | - Guang Yang
- Graduate Division of Nutritional and Environmental Sciences, University of Shizuoka, 52-1 Yada, Shizuoka, 422-8526, Japan
| | - Tatsushi Toyooka
- National Institute of Occupational Safety and Health, Kawasaki, Japan
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Choe JK, Hua LC, Komaki Y, Simpson AMA, McCurry DL, Mitch WA. Evaluation of Histidine Reactivity and Byproduct Formation during Peptide Chlorination. Environ Sci Technol 2021; 55:1790-1799. [PMID: 33492937 DOI: 10.1021/acs.est.0c07408] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The covalent modifications resulting from chlorine reactions with peptide-bound amino acids contribute to pathogen inactivation and disinfection byproduct (DBP) formation. Previous research suggested that histidine is the third most reactive of the seven chlorine-reactive amino acids, leading to the formation of 2-chlorohistidine, 2-oxohistidine, or low-molecular-weight byproducts such as trihalomethanes. This study demonstrates that histidine is less reactive toward formation of chlorine transformation products (transformation time scale of hours to days) than five of the seven chlorine-reactive amino acids, including tyrosine (transformation time scale of minutes). Chlorine targeted tyrosine in preference to histidine within peptides, indicating that chlorine reactions with tyrosine and other more reactive amino acids could contribute more to the structural modifications to proteins over the short time scales relevant to pathogen inactivation. Over the longer time scales relevant to disinfection byproduct formation in treatment plants or distribution systems, this study identified β-cyanoalanine as the dominant transformation product of chlorine reactions with peptide-bound histidine, with molar yields of ∼50% after 1 day. While a chlorinated histidine intermediate was observed at lower yields (maximum ∼5%), the cumulative concentration of the conventional low-molecular-weight DBPs (e.g., trihalomethanes) was ≤7%. These findings support the need to identify the high-yield initial transformation products of chlorine reactions with important precursor structures to facilitate the identification of unknown DBPs.
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Affiliation(s)
- Jong Kwon Choe
- Department of Civil and Environmental Engineering and Institute of Construction and Environmental Engineering, Seoul National University, Seoul 08826, Republic of Korea
| | - Lap-Cuong Hua
- Institute of Environmental Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
| | - Yukako Komaki
- Graduate Division of Nutritional and Environmental Sciences, University of Shizuoka, Shizuoka 422-8529, Japan
| | - Adam M-A Simpson
- Department of Civil and Environmental Engineering, Stanford University, Stanford, California 94305, United States
| | - Daniel L McCurry
- Department of Civil and Environmental Engineering, University of Southern California, Los Angeles, California 90089, United States
| | - William A Mitch
- Department of Civil and Environmental Engineering, Stanford University, Stanford, California 94305, United States
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9
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Yamashita R, Komaki Y, Yang G, Ibuki Y. Cell line-dependent difference in glutathione levels affects the cigarette sidestream smoke-induced inhibition of nucleotide excision repair. Mutat Res Genet Toxicol Environ Mutagen 2020; 858-860:503273. [PMID: 33198939 DOI: 10.1016/j.mrgentox.2020.503273] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 03/27/2020] [Revised: 09/15/2020] [Accepted: 09/21/2020] [Indexed: 10/23/2022]
Abstract
We recently reported that cigarette sidestream smoke (CSS) induced inhibition of nucleotide excision repair (NER) and the cause was NER molecule degradation by aldehydes contained in CSS [Carcinogenesis39, 56-65, 2018; Mutat. Res.834, 42-50, 2018]. In this study, we examined the relationship between intracellular glutathione (GSH) levels and CSS-induced NER inhibition. CSS treatment decreased the intracellular GSH level in human keratinocytes HaCaT, in which the repair of pyrimidine (6-4) pyrimidone photoproducts (6-4PPs) after UVB irradiation was suppressed. We used l-buthionine-(S,R)-sulfoximine (BSO) to artificially deplete intracellular GSH level. BSO treatment remarkably accelerated the CSS-induced NER inhibition. The NER inhibition by CSS was attributed to the delay of accumulation of NER molecules (TFIIH and XPG) to DNA damaged sites, which was further enhanced by BSO treatment. CSS degraded TFIIH, and BSO promoted it as expected. Formaldehyde (FA), a major constituent of CSS, showed similar intracellular GSH reduction and NER inhibition, and BSO promoted its inhibitory effect. Five cultured cell lines showed considerable variability in intrinsic GSH levels, and CSS-induced NER inhibitory effect was significantly correlated with the GSH levels. Chemicals like aldehydes are known to react not only with proteins but also with DNA, causing DNA lesions targeted by NER. Our results suggest that the tissues and cells with low intrinsic GSH levels are susceptible to treatment with CSS and electrophilic compounds like aldehydes through NER inhibition, thus leading to higher genotoxicity and carcinogenicity.
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Affiliation(s)
- Riko Yamashita
- Graduate Division of Nutritional and Environmental Sciences, University of Shizuoka, 52-1 Yada, Shizuoka, 422-8526, Japan
| | - Yukako Komaki
- Graduate Division of Nutritional and Environmental Sciences, University of Shizuoka, 52-1 Yada, Shizuoka, 422-8526, Japan
| | - Guang Yang
- Graduate Division of Nutritional and Environmental Sciences, University of Shizuoka, 52-1 Yada, Shizuoka, 422-8526, Japan
| | - Yuko Ibuki
- Graduate Division of Nutritional and Environmental Sciences, University of Shizuoka, 52-1 Yada, Shizuoka, 422-8526, Japan.
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Komaki Y, Simpson AMA, Choe JK, Pinney MM, Herschlag D, Chuang YH, Mitch WA. Serum electrolytes can promote hydroxyl radical-initiated biomolecular damage from inflammation. Free Radic Biol Med 2019; 141:475-482. [PMID: 31349038 DOI: 10.1016/j.freeradbiomed.2019.07.023] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/23/2019] [Revised: 07/11/2019] [Accepted: 07/22/2019] [Indexed: 11/24/2022]
Abstract
Chronic inflammatory disorders are associated with biomolecular damage attributed partly to reactions with Reactive Oxygen Species (ROS), particularly hydroxyl radicals (•OH). However, the impacts of serum electrolytes on ROS-associated damage has received little attention. We demonstrate that the conversion of •OH to carbonate and halogen radicals via reactions with serum-relevant carbonate and halide concentrations fundamentally alters the targeting of amino acids and loss of enzymatic activity in catalase, albumin and carbonic anhydrase, three important blood proteins. Chemical kinetic modeling indicated that carbonate and halogen radical concentrations should exceed •OH concentrations by 6 and 2 orders of magnitude, respectively. Steady-state γ-radiolysis experiments demonstrated that serum-level carbonates and halides increased tyrosine, tryptophan and enzymatic activity losses in catalase up to 6-fold. These outcomes were specific to carbonates and halides, not general ionic strength effects. Serum carbonates and halides increased the degradation of tyrosines and methionines in albumin, and increased the degradation of histidines while decreasing enzymatic activity loss in carbonic anhydrase. Serum electrolytes increased the degradation of tyrosines, tryptophans and enzymatic activity in the model enzyme, ketosteroid isomerase, predominantly due to carbonate radical reactions. Treatment of a mutant ketosteroid isomerase indicated that preferential targeting of the active site tyrosine accounted for half of the total tyrosine loss. The results suggest that carbonate and halogen radicals may be more significant than •OH as drivers for protein degradation in serum. Accounting for the selective targeting of biomolecules by these daughter radicals is important for developing a mechanistic understanding of the consequences of oxidative stress.
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Affiliation(s)
- Yukako Komaki
- Graduate Division of Nutritional and Environmental Sciences, University of Shizuoka, Shizuoka, 422-8526, Japan
| | - Adam M-A Simpson
- Department of Civil and Environmental Engineering, Stanford University, 473 Via Ortega, Stanford, CA, 94305, USA
| | - Jong Kwon Choe
- Department of Civil and Environmental Engineering and Institute of Construction and Environmental Engineering, Seoul National University, 1 Gwanak-ro Gwanak-gu, Seoul, 08826, Republic of Korea
| | - Margaux M Pinney
- Department of Biochemistry, Stanford University, Stanford, CA, 94305, USA
| | - Daniel Herschlag
- Department of Biochemistry, Stanford University, Stanford, CA, 94305, USA
| | - Yi-Hsueh Chuang
- Department of Civil and Environmental Engineering, Stanford University, 473 Via Ortega, Stanford, CA, 94305, USA
| | - William A Mitch
- Department of Civil and Environmental Engineering, Stanford University, 473 Via Ortega, Stanford, CA, 94305, USA.
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Komaki Y, Simpson AMA, Choe JK, Plewa MJ, Mitch WA. Chlorotyrosines versus Volatile Byproducts from Chlorine Disinfection during Washing of Spinach and Lettuce. Environ Sci Technol 2018; 52:9361-9369. [PMID: 30040386 DOI: 10.1021/acs.est.8b03005] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Following the Food Safety Modernization Act of 2011 in the U.S., guidelines for disinfection washes in food packaging facilities are under consideration to control pathogen risks. However, disinfectant exposures may need optimization because the high concentrations of chlorine disinfectant promote the formation of high levels of disinfection byproducts (DBPs). When chlorine doses up through the 200 mg/L as Cl2 range relevant to the current practice were applied to spinach and lettuce, significant DBP formation was observed, even within 5 min at 7 °C. Concentrations of volatile chlorinated DBPs in washwater were far higher than typically observed in disinfected drinking water (e.g., 350 μg/L 1,1-dichloropropanone). However, these DBPs partitioned to the aqueous phase and so represent a greater concern for the disposal or reuse of washwater than for consumer exposure via food. The volatile DBPs represent the low-yield, final products of chlorination reactions with multiple biomolecular precursors. The initial, high-yield transformation products of such reactions may represent a greater concern for consumer exposure because they remain bound within the biopolymers in food and would be liberated during digestion. Using protein-bound tyrosine as an example precursor, the concentrations of the initial 3-chlorotyrosine and 3,5-dichlorotyrosine transformation products from this one precursor in the leaf phase were comparable to, and, in the case of some lettuces, exceeded, the aggregate aqueous concentration of volatile DBPs formed from multiple precursors. Chlorotyrosine formation increased when spinach was shredded due to the greater accessibility of chlorine to proteins in the leaf interiors. The cytotoxicity of chlorotyrosines to Chinese hamster ovary cells was higher than any of the trihalomethanes regulated in drinking water.
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Affiliation(s)
- Yukako Komaki
- Department of Civil and Environmental Engineering , Stanford University , 473 Via Ortega , Stanford , California 94305 , United States
| | - Adam M-A Simpson
- Department of Civil and Environmental Engineering , Stanford University , 473 Via Ortega , Stanford , California 94305 , United States
| | - Jong Kwon Choe
- Department of Civil and Environmental Engineering and Institute of Construction and Environmental Engineering , Seoul National University , 1 Gwanak-ro , Gwanak-gu , Seoul 08826 , Republic of Korea
| | - Michael J Plewa
- Department of Crop Sciences and Safe Global Water Institute , University of Illinois at Urbana-Champaign , Urbana , Illinois 61801 , United States
| | - William A Mitch
- Department of Civil and Environmental Engineering , Stanford University , 473 Via Ortega , Stanford , California 94305 , United States
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Komaki Y, Yamada A, Komaki F, Sakuraba A. Letter: immunogenicity of infliximab originator vs. CT-P13 in IBD patients-authors' reply. Aliment Pharmacol Ther 2017; 46:905-906. [PMID: 29023885 DOI: 10.1111/apt.14274] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/08/2022]
Affiliation(s)
- Y Komaki
- Section of Gastroenterology, Hepatology and Nutrition, Department of Medicine, The University of Chicago Medicine, Chicago, USA
| | - A Yamada
- Section of Gastroenterology, Hepatology and Nutrition, Department of Medicine, The University of Chicago Medicine, Chicago, USA
| | - F Komaki
- Section of Gastroenterology, Hepatology and Nutrition, Department of Medicine, The University of Chicago Medicine, Chicago, USA
| | - A Sakuraba
- Section of Gastroenterology, Hepatology and Nutrition, Department of Medicine, The University of Chicago Medicine, Chicago, USA
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Komaki Y, Komaki F, Yamada A, Micic D, Ido A, Sakuraba A. Meta-Analysis of the Risk of Immune-Related Adverse Events With Anticytotoxic T-Lymphocyte-Associated Antigen 4 and Antiprogrammed Death 1 Therapies. Clin Pharmacol Ther 2017; 103:318-331. [PMID: 28118483 DOI: 10.1002/cpt.633] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2016] [Revised: 01/05/2017] [Accepted: 01/16/2017] [Indexed: 01/03/2023]
Abstract
We assessed the risks of immune-related adverse events with anticytotoxic T-lymphocyte-associated antigen 4 (CTLA4) and antiprogrammed death 1 (PD1) therapies by meta-analysis. Twenty-one studies including 11,144 patients were found. Anti-CTLA4 therapy was associated with a significantly higher risk of overall immune-related adverse events: diarrhea, immune-related colitis, pruritus, and rash compared to control therapies (relative risk (RR) = 2.43, 2.10, 11.39, 3.88, 3.87, 95% confidence interval (CI) = 1.77-3.34, 1.52-2.45, 6.30-20.59, 2.37-6.37, 2.39-6.27, P < 0.001 for all outcomes). Anti-PD1 therapy was associated with a significantly higher risk of pruritus (RR = 4.01, 95% CI = 1.97 to 8.17, P < 0.001); however, it did not increase the risks of other adverse events. Anti-CTLA4 and anti-PD1 therapies have distinct features of immune-related adverse events. The results of our study would aid the surveillance and management of immune-related adverse events in patients receiving these therapies.
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Affiliation(s)
- Y Komaki
- Section of Gastroenterology, Hepatology and Nutrition, Department of Medicine, University of Chicago Medicine, Chicago, Illinois, USA
| | - F Komaki
- Section of Gastroenterology, Hepatology and Nutrition, Department of Medicine, University of Chicago Medicine, Chicago, Illinois, USA
| | - A Yamada
- Section of Gastroenterology, Hepatology and Nutrition, Department of Medicine, University of Chicago Medicine, Chicago, Illinois, USA.,Department of Internal Medicine, Toho University Sakura Medical Center, Chiba, Japan
| | - D Micic
- Division of Gastroenterology and Hepatology, Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA
| | - A Ido
- Digestive and Lifestyle Diseases, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan
| | - A Sakuraba
- Section of Gastroenterology, Hepatology and Nutrition, Department of Medicine, University of Chicago Medicine, Chicago, Illinois, USA
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Komaki Y, Plewa MJ. Investigation of nuclear enzyme topoisomerase as a putative molecular target of monohaloacetonitrile disinfection by-products. J Environ Sci (China) 2017; 58:231-238. [PMID: 28774614 DOI: 10.1016/j.jes.2017.04.024] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2017] [Revised: 04/17/2017] [Accepted: 04/20/2017] [Indexed: 05/08/2023]
Abstract
Disinfection by-products occur widely as the unintended effect of water disinfection and are associated with toxicity and adverse human health effects. Yet the molecular mechanisms of their toxicity are not well understood. To investigate the molecular basis of hyperploidy induction by monohaloacetonitriles, the interaction of monohaloacetonitriles with topoisomerase II in Chinese hamster ovary cells was examined. We showed a concentration-dependent inhibition of DNA decatenation activity of topoisomerase under acellular conditions while in vitro monohaloacetonitrile treatment expressed mixed results. The working hypothesis, that topoisomerase II is a molecular target of monohaloacetonitriles, was only partially supported. Nevertheless, this research serves as a starting point toward molecular mechanisms of toxic action of monohaloacetonitriles.
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Affiliation(s)
- Yukako Komaki
- Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, United States; Safe Global Water Institute, University of Illinois at Urbana-Champaign, Urbana, IL 61801, United States.
| | - Michael J Plewa
- Safe Global Water Institute, University of Illinois at Urbana-Champaign, Urbana, IL 61801, United States; Department of Crop Sciences, University of Illinois at Urbana-Champaign, Urbana, IL 61801, United States
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Komaki Y, Yamada A, Komaki F, Micic D, Ido A, Sakuraba A. Editorial: CT-P13, a biosimilar of anti-tumour necrosis factor-alpha agent (infliximab), in inflammatory bowel diseases - authors' reply. Aliment Pharmacol Ther 2017; 45:1372. [PMID: 28417494 DOI: 10.1111/apt.14060] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Y Komaki
- Section of Gastroenterology, Hepatology and Nutrition, Department of Medicine, The University of Chicago Medicine, Chicago, IL, USA
| | - A Yamada
- Section of Gastroenterology, Hepatology and Nutrition, Department of Medicine, The University of Chicago Medicine, Chicago, IL, USA
| | - F Komaki
- Section of Gastroenterology, Hepatology and Nutrition, Department of Medicine, The University of Chicago Medicine, Chicago, IL, USA
| | - D Micic
- Division of Gastroenterology and Hepatology, Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | - A Ido
- Digestive and Lifestyle Diseases, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan
| | - A Sakuraba
- Section of Gastroenterology, Hepatology and Nutrition, Department of Medicine, The University of Chicago Medicine, Chicago, IL, USA
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Komaki Y, Yamada A, Komaki F, Micic D, Ido A, Sakuraba A. Systematic review with meta-analysis: the efficacy and safety of CT-P13, a biosimilar of anti-tumour necrosis factor-α agent (infliximab), in inflammatory bowel diseases. Aliment Pharmacol Ther 2017; 45:1043-1057. [PMID: 28239873 DOI: 10.1111/apt.13990] [Citation(s) in RCA: 83] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/24/2016] [Revised: 12/23/2016] [Accepted: 01/26/2017] [Indexed: 12/17/2022]
Abstract
BACKGROUND Biosimilars of anti-tumour necrosis factor (TNF)-α agents have now become clinically available for the treatment of inflammatory bowel diseases (IBD). AIM To perform a systematic review and meta-analysis to evaluate the efficacy and safety of biosimilars of anti-TNF-α agents in patients with IBD. METHODS Electronic databases were searched. The outcomes were the pooled rates of clinical response or remission, sustained clinical response or remission, and adverse events in patients with IBD induced with or switched to biosimilars of anti-TNF-α agents. RESULTS Eleven observational studies reporting outcomes in 829 patients treated with biosimilar of infliximab (CT-P13) were identified. The pooled rates of clinical response among Crohn's disease (CD) and ulcerative colitis (UC) at 8-14 weeks were 0.79 (95% confidence interval (CI) = 0.65-0.88) and 0.74 (95% CI = 0.65-0.82), respectively, and at 24-30 weeks were 0.77 (95% CI = 0.63-0.86) and 0.77 (95% CI = 0.67-0.85) respectively. Adverse events were rare (CD, 0.08 (95% CI = 0.02-0.26); UC, 0.08 (95% CI = 0.03-0.17)). The pooled rates of sustained clinical response among CD and UC after switching from infliximab to CT-P13 at 30-32 weeks were 0.85 (95% CI = 0.71-0.93) and 0.96 (95% CI = 0.58-1.00), respectively, and at 48-63 weeks were 0.75 (95% CI = 0.44-0.92) and 0.83 (95% CI = 0.19-0.99) respectively. Adverse events were rare (CD, 0.10, 95% CI = 0.02-0.31; UC, 0.22, 95% CI = 0.04-0.63). CONCLUSIONS CT-P13 was associated with excellent clinical efficacy and safety profile, supporting its use in the treatment of IBD.
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Affiliation(s)
- Y Komaki
- Section of Gastroenterology, Hepatology and Nutrition, Department of Medicine, The University of Chicago Medicine, Chicago, USA
| | - A Yamada
- Section of Gastroenterology, Hepatology and Nutrition, Department of Medicine, The University of Chicago Medicine, Chicago, USA
| | - F Komaki
- Section of Gastroenterology, Hepatology and Nutrition, Department of Medicine, The University of Chicago Medicine, Chicago, USA
| | - D Micic
- Division of Gastroenterology and Hepatology, Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, USA
| | - A Ido
- Digestive and Lifestyle Diseases, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan
| | - A Sakuraba
- Section of Gastroenterology, Hepatology and Nutrition, Department of Medicine, The University of Chicago Medicine, Chicago, USA
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Kimura SY, Vu TN, Komaki Y, Plewa MJ, Mariñas BJ. Acetonitrile and N-Chloroacetamide Formation from the Reaction of Acetaldehyde and Monochloramine. Environ Sci Technol 2015; 49:9954-63. [PMID: 26167888 DOI: 10.1021/acs.est.5b01875] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Nitriles and amides are two classes of nitrogenous disinfection byproducts (DBPs) associated with chloramination that are more cytotoxic and genotoxic than regulated DBPs. Monochloramine reacts with acetaldehyde, a common ozone and free chlorine disinfection byproduct, to form 1-(chloroamino)ethanol. Equilibrium (K1) and forward and reverse rate (k1,k-1) constants for the reaction between initial reactants and 1-(chloroamino)ethanol were determined between 2 and 30 °C. Activation energies for k1 and k-1 were 3.04 and 45.2 kJ·mol(-1), respectively, and enthalpy change for K1 was -42.1 kJ·mol(-1). In parallel reactions, 1-(chloroamino)ethanol (1) slowly dehydrated (k2) to (chloroimino)ethane that further decomposed to acetonitrile and (2) was oxidized (k3) by monochloramine to produce N-chloroacetamide. Both reactions were acid/base catalyzed, and rate constants were characterized at 10, 18, and 25 °C. Modeling for drinking water distribution system conditions showed that N-chloroacetamide and acetonitrile concentrations were 5-9 times higher at pH 9.0 compared to 7.8. Furthermore, acetonitrile concentration was found to form 7-10 times higher than N-chloroacetamide under typical monochloramine and acetaldehyde concentrations. N-chloroacetamide cytotoxicity (LC50 = 1.78 × 10(-3) M) was comparable to dichloroacetamide and trichloroacetamide, but less potent than N,2-dichloroacetamide and chloroacetamide. While N-chloroacetamide was not found to be genotoxic, N,2-dichloroacetamide genotoxic potency (5.19 × 10(-3) M) was on the same order of magnitude as chloroacetamide and trichloroacetamide.
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Affiliation(s)
- Susana Y Kimura
- †Department of Civil and Environmental Engineering, ‡Department of Crop Science, and §Science and Technology Center for Advanced Materials for the Purification of Water with Systems, Safe Global Water Institute, University of Illinois at Urbana-Champaign, Champaign, Illinois 61801, United States
| | - Trang Nha Vu
- †Department of Civil and Environmental Engineering, ‡Department of Crop Science, and §Science and Technology Center for Advanced Materials for the Purification of Water with Systems, Safe Global Water Institute, University of Illinois at Urbana-Champaign, Champaign, Illinois 61801, United States
| | - Yukako Komaki
- †Department of Civil and Environmental Engineering, ‡Department of Crop Science, and §Science and Technology Center for Advanced Materials for the Purification of Water with Systems, Safe Global Water Institute, University of Illinois at Urbana-Champaign, Champaign, Illinois 61801, United States
| | - Michael J Plewa
- †Department of Civil and Environmental Engineering, ‡Department of Crop Science, and §Science and Technology Center for Advanced Materials for the Purification of Water with Systems, Safe Global Water Institute, University of Illinois at Urbana-Champaign, Champaign, Illinois 61801, United States
| | - Benito J Mariñas
- †Department of Civil and Environmental Engineering, ‡Department of Crop Science, and §Science and Technology Center for Advanced Materials for the Purification of Water with Systems, Safe Global Water Institute, University of Illinois at Urbana-Champaign, Champaign, Illinois 61801, United States
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Hikishima K, Ando K, Komaki Y, Kawai K, Yano R, Inoue T, Itoh T, Yamada M, Momoshima S, Okano HJ, Okano H. Voxel-based morphometry of the marmoset brain: In vivo detection of volume loss in the substantia nigra of the MPTP-treated Parkinson's disease model. Neuroscience 2015; 300:585-92. [PMID: 26012491 DOI: 10.1016/j.neuroscience.2015.05.041] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2015] [Revised: 05/14/2015] [Accepted: 05/16/2015] [Indexed: 11/30/2022]
Abstract
Movement dysfunction in Parkinson's disease (PD) is caused by the degeneration of dopaminergic (DA) neurons in the substantia nigra (SN). Here, we established a method for voxel-based morphometry (VBM) and automatic tissue segmentation of the marmoset monkey brain using a 7-T animal scanner and applied the method to assess DA degeneration in a PD model, 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP)-treated animals, with tyrosine-hydroxylase staining. The most significant decreases of local tissue volume were detected in the bilateral SN of MPTP-treated marmoset brains (-53.0% in right and -46.5% in left) and corresponded with the location of DA neurodegeneration found in histology (-65.4% in right). In addition to the SN, the decreases were also confirmed in the locus coeruleus, and lateral hypothalamus. VBM using 7-T MRI was effective in detecting volume loss in the SN of the PD-model marmoset. This study provides a potential basis for the application of VBM with ultra-high field MRI in the clinical diagnosis of PD. The developed method may also offer value in automatic whole-brain evaluation of structural changes for the marmoset monkey.
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Affiliation(s)
- K Hikishima
- Department of Physiology, Keio University School of Medicine, Tokyo, Japan; Central Institute for Experimental Animals, Kawasaki, Japan
| | - K Ando
- Central Institute for Experimental Animals, Kawasaki, Japan
| | - Y Komaki
- Department of Physiology, Keio University School of Medicine, Tokyo, Japan; Central Institute for Experimental Animals, Kawasaki, Japan
| | - K Kawai
- Central Institute for Experimental Animals, Kawasaki, Japan
| | - R Yano
- Department of Physiology, Keio University School of Medicine, Tokyo, Japan
| | - T Inoue
- Central Institute for Experimental Animals, Kawasaki, Japan
| | - T Itoh
- Central Institute for Experimental Animals, Kawasaki, Japan
| | - M Yamada
- Faculty of Radiological Technology, Fujita Health University School of Health Sciences, Toyoake, Japan
| | - S Momoshima
- Department of Diagnostic Radiology, Keio University School of Medicine, Tokyo, Japan
| | - H J Okano
- Division of Regenerative Medicine, Jikei University School of Medicine, Tokyo, Japan
| | - H Okano
- Department of Physiology, Keio University School of Medicine, Tokyo, Japan; Laboratory for Marmoset Neural Architecture, Brain Science Institute RIKEN, Wako, Japan.
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Yang Y, Komaki Y, Kimura SY, Hu HY, Wagner ED, Mariñas BJ, Plewa MJ. Toxic impact of bromide and iodide on drinking water disinfected with chlorine or chloramines. Environ Sci Technol 2014; 48:12362-9. [PMID: 25222908 DOI: 10.1021/es503621e] [Citation(s) in RCA: 153] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Disinfectants inactivate pathogens in source water; however, they also react with organic matter and bromide/iodide to form disinfection byproducts (DBPs). Although only a few DBP classes have been systematically analyzed for toxicity, iodinated and brominated DBPs tend to be the most toxic. The objectives of this research were (1) to determine if monochloramine (NH2Cl) disinfection generated drinking water with less toxicity than water disinfected with free chlorine (HOCl) and (2) to determine the impact of added bromide and iodide in conjunction with HOCl or NH2Cl disinfection on mammalian cell cytotoxicity and genomic DNA damage induction. Water disinfected with chlorine was less cytotoxic but more genotoxic than water disinfected with chloramine. For both disinfectants, the addition of Br(-) and I(-) increased cytotoxicity and genotoxicity with a greater response observed with NH2Cl disinfection. Both cytotoxicity and genotoxicity were highly correlated with TOBr and TOI. However, toxicity was weakly and inversely correlated with TOCl. Thus, the forcing agents for cytotoxicity and genotoxicity were the generation of brominated and iodinated DBPs rather than the formation of chlorinated DBPs. Disinfection practices need careful consideration especially when using source waters containing elevated bromide and iodide.
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Affiliation(s)
- Yang Yang
- Environmental Simulation and Pollution Control State Key Joint Laboratory, School of Environment, Tsinghua University , Beijing, P.R. China
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Komaki Y, Mariñas BJ, Plewa MJ. Toxicity of drinking water disinfection byproducts: cell cycle alterations induced by the monohaloacetonitriles. Environ Sci Technol 2014; 48:11662-9. [PMID: 25185076 DOI: 10.1021/es5032344] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Haloacetonitriles (HANs) are a chemical class of drinking water disinfection byproducts (DBPs) that form from reactions between disinfectants and nitrogen-containing precursors, the latter more prevalent in water sources impacted by algae bloom and municipal wastewater effluent discharge. HANs, previously demonstrated to be genotoxic, were investigated for their effects on the mammalian cell cycle. Treating Chinese hamster ovary (CHO) cells with monoHANs followed by the release from the chemical treatment resulted in the accumulation of abnormally high DNA content in cells over time (hyperploid). The potency for the cell cycle alteration followed the order: iodoacetonitrile (IAN) > bromoacetonitrile (BAN) ≫ chloroacetonitrile (CAN). Exposure to 6 μM IAN, 12 μM BAN and 900 μM CAN after 26 h post-treatment incubation resulted in DNA repair; however, subsequent cell cycle alteration effects were observed. Cell proliferation of HAN-treated cells was suppressed for as long as 43 to 52 h. Enlarged cell size was observed after 52 h post-treatment incubation without the induction of cytotoxicity. The HAN-mediated cell cycle alteration was mitosis- and proliferation-dependent, which suggests that HAN treatment induced mitosis override, and that HAN-treated cells proceeded into S phase and directly into the next cell cycle. Cells with multiples genomes would result in aneuploidy (state of abnormal chromosome number and DNA content) at the next mitosis since extra centrosomes could compromise the assembly of bipolar spindles. There is accumulating evidence of a transient tetraploid state proceeding to aneuploidy in cancer progression. Biological self-defense systems to ensure genomic stability and to eliminate tetraploid cells exist in eukaryotic cells. A key tumor suppressor gene, p53, is oftentimes mutated in various types of human cancer. It is possible that HAN disruption of the normal cell cycle and the generation of aberrant cells with an abnormal number of chromosomes may contribute to cancer induction and perhaps be involved in the induction of adverse pregnancy outcomes associated with long-term consumption of disinfected water. Here we present the first observation of the induction of hyperploidy by a class of DBPs.
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Affiliation(s)
- Yukako Komaki
- Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign , Urbana, Illinois 61801, United States
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Kimura SY, Komaki Y, Plewa MJ, Mariñas BJ. Chloroacetonitrile and n,2-dichloroacetamide formation from the reaction of chloroacetaldehyde and monochloramine in water. Environ Sci Technol 2013; 47:12382-12390. [PMID: 24147580 DOI: 10.1021/es4029638] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Combined chlorine is increasingly being used as an alternative disinfectant to free chlorine to maintain a residual in drinking water distribution systems mainly because it would reduce the formation of regulated disinfection byproducts (DBPs) trihalomethanes and haloacetic acids. However, the use of combined chlorine could promote the formation of currently unregulated nitrogenous DBPs (N-DBPs) such as haloacetonitriles and haloacetamides that are found to be more cyto- and genotoxic than regulated DBPs. Monochloramine quickly reacts with chloroacetaldehyde, a DBP formed during primary disinfection with free chlorine, forming and reaching pseudoequilibrium (equilibrium constant K1 = 1.87 × 10(3) M(-1)) with the carbinolamine 2-chloro-1-(chloroamino)ethanol. 2-Chloro-1-(chloroamino)ethanol undergoes slow dehydration to form the imine 1-chloro-2-(chloroimino)ethane that decomposes at a faster rate to chloroacetonitrile. 2-Chloro-1-(chloroamino)ethanol is also oxidized by monochloramine to produce the previously unreported DBP N,2-dichloroacetamide. The carbinolamine dehydration step was found to be acid/base catalyzed (k2(0) = 3.30 × 10(-6) s(-1), k2(H) = 2.43 M(-1) s(-1), k2(OH) = 3.90 M(-1) s(-1)). In contrast, N,2-dichloroacetamide formation was observed to be only base catalyzed (k3(OH) = 3.03 × 10(4) M(-2) s(-1)). N,2-dichloroacetamide cytotoxicity (LC50 = 2.56 × 10(-4) M) was found to be slightly lower compared to that reported for chloroacetamide but higher than those of di- and trichloroacetamide.
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Affiliation(s)
- Susana Y Kimura
- Department of Civil and Environmental Engineering, ‡Department of Crop Science, and §Science and Technology Center for Advanced Materials for the Purification of Water with Systems, University of Illinois at Urbana-Champaign , Urbana-Champaign, Illinois 61801, United States
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Saenz de Jubera AM, Herbison JH, Komaki Y, Plewa MJ, Moore JS, Cahill DG, Mariñas BJ. Development and performance characterization of a polyamide nanofiltration membrane modified with covalently bonded aramide dendrimers. Environ Sci Technol 2013; 47:8642-8649. [PMID: 23796139 DOI: 10.1021/es400765q] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
A first generation of amine terminated aramide dendrimers (G1-NH2) was covalently attached to the polyamide (PA) active layer of a commercially available nanofiltration (NF) membrane. Amide bonds between G1-NH2 and PA free carboxylic groups were formed by activation of the carboxylic groups with 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide (EDC) or 2-chloro-1-methylpyridinium iodide (CMPI), followed by aminolysis. Dendrimer attachment was assessed by indirectly measuring the concentration of carboxylic groups and amine groups before and after membrane modification with RBS using yttrium and tungstate ions (Y(3+) and WO4(2-)) as ion probes. RBS analyses showed a decrease in the concentration of carboxylic groups and an increase in amine groups on the membrane active layer, consistent with dendrimers attaching covalently to the active layer. Permeation experiments with Rhodamine WT (R-WT) revealed that the water and solutes permeability decreased after modification with dendrimer G1-NH2. Water permeability of G1-NH2 modified membrane decreased by 16-19% using EDC combined with sulfo-N-hydroxysuccinimide (s-NHS), and by 17-33% using CMPI. The permeability of the electrolyte BaCl2 decreased by 54% after G1-NH2 modification using EDC/s-NHS and only by 20% using CMPI, the latter consistent with a weaker Donnan exclusion effect. The permeability of the larger solute R-WT decreased by 82% in modified G1-NH2 membranes when using EDC/s-NHS, and 64% for cross-linking reagent CMPI. Thus, the use of EDC/s-NHS was more favorable because it resulted in higher gains in solute rejection with lower losses in water permeability.
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Affiliation(s)
- Ana M Saenz de Jubera
- Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign , Urbana, Illinois 61801, United States
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Hikishima K, Sawada K, Murayama A, Komaki Y, Kawai K, Sato N, Inoue T, Itoh T, Momoshima S, Iriki A, Okano H, Sasaki E, Okano H. Atlas of the developing brain of the marmoset monkey constructed using magnetic resonance histology. Neuroscience 2013; 230:102-13. [DOI: 10.1016/j.neuroscience.2012.09.053] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2012] [Revised: 08/29/2012] [Accepted: 09/22/2012] [Indexed: 10/27/2022]
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Hsiao A, Komaki Y, Imaad SM, Mariñas BJ, Plewa MJ, Liu GL. Cytotoxicity analysis of water disinfection byproducts with a micro-pillar microfluidic device. Lab Chip 2012; 12:3891-3900. [PMID: 22832726 DOI: 10.1039/c2lc40374a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Water disinfection byproducts (DBPs) are a class of chemicals that are produced when chemical disinfectants react with organic materials in untreated water. Cytotoxicity and genotoxicity of DBPs have been systematically evaluated to compile a comparative, quantitative database of in vitro mammalian cell toxicity of DBPs. However, one of the most challenging limitations for current DBP cytotoxicity assessment assays is sample availability. Although our current cytotoxicity assay using a 96-well microplate has been designed to reduce sample consumption, further minimization of the size of the test system would allow us to explore various possibilities for point-of-care applications. We have developed a microfluidic device with micro-pillars that shows high uniformity in distribution of cells across all chambers with low cell count. We compare the performance between the 96-well microplate and the microfluidic device by running 72-hour standalone-on-chip cell culture and cytotoxicity analysis experiments, using dimethyl sulfoxide (DMSO) and ethanol as model toxic agents, and bromoacetic acid (BAA) as a representative DBP. The results show close agreement between the two systems. The measured LC(50) values for the 96-well microplate and the microfluidic device are 1.54% v/v and 1.27% v/v for DMSO, 1.44% v/v and 2.92% v/v for ethanol, and 17.6 μM and 8.20 μM for BAA, respectively. The micro-pillar microfluidic device offers a great reduction in sample consumption while maintaining the accuracy of the cytotoxicity analyses of water disinfection byproducts.
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Affiliation(s)
- Austin Hsiao
- Department of Bioengineering, University of Illinois at Urbana-Champaign, Urbana, IL, USA
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Hikishima K, Quallo M, Komaki Y, Yamada M, Kawai K, Momoshima S, Okano H, Sasaki E, Tamaoki N, Lemon R, Iriki A, Okano H. Population-averaged standard template brain atlas for the common marmoset (Callithrix jacchus). Neuroimage 2011; 54:2741-9. [DOI: 10.1016/j.neuroimage.2010.10.061] [Citation(s) in RCA: 78] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2010] [Revised: 10/18/2010] [Accepted: 10/20/2010] [Indexed: 11/27/2022] Open
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Komaki Y, Pals J, Wagner ED, Mariñas BJ, Plewa MJ. Mammalian cell DNA damage and repair kinetics of monohaloacetic acid drinking water disinfection by-products. Environ Sci Technol 2009; 43:8437-42. [PMID: 19924981 DOI: 10.1021/es901852z] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Haloacetic acids (HAAs) are the second most common class of chlorinated water disinfection by-products (DBPs). The single cell gel electrophoresis genotoxicity assay using Chinese hamster ovary (CHO) cells was modified to include liquid holding recovery time to measure genomic DNA damage and repair kinetics of three monoHAAs: chloroacetic acid (CAA), bromoacetic acid (BAA), and iodoacetic acid (IAA). The rank order of genotoxic potency was IAA > BAA >> CAA from previous research. The concentration of each HAA was chosen to generate approximately the same level of genotoxic damage. No cytotoxicity was expressed during the 24 h liquid holding period. Nuclei from CHO cells treated with BAA showed the lowest rate of DNA repair (t(50) = 296 min) compared to that of CAA or IAA (t(50) = 134 and 84 min, respectively). The different rates of genomic repair expressed by IAA or CAA versus BAA suggest that different distributions of DNA lesions are induced. The use of DNA repair coupled with genomic technologies may lead to the understanding of the biological and genetic mechanisms involved in toxic responses induced by DBPs.
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Affiliation(s)
- Yukako Komaki
- Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
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Ichinose M, Sugiura H, Yamagata S, Koarai A, Tomaki M, Ogawa H, Komaki Y, Barnes PJ, Shirato K, Hattori T. Xanthine oxidase inhibition reduces reactive nitrogen species production in COPD airways. Eur Respir J 2003; 22:457-61. [PMID: 14516135 DOI: 10.1183/09031936.03.00052002] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Reactive nitrogen species (RNS) have been reported to be involved in the inflammatory process in chronic obstructive pulmonary disease (COPD). However, there are no studies on the modulation of RNS in COPD. It was hypothesised that inhibition of xanthine oxidase (XO) might decrease RNS production in COPD airways through the suppression of superoxide anion production. Ten COPD and six healthy subjects participated in the study. The XO inhibitor allopurinol (300 mg x day(-1) p.o. for 4 weeks) was administered to COPD patients. RNS production in the airway was assessed by 3-nitrotyrosine immunoreactivity and enzymic activity of XO in induced sputum as well as by exhaled nitric oxide (eNO) concentration. XO activity in the airway was significantly elevated in COPD compared with healthy subjects. Allopurinol administration to COPD subjects significantly decreased XO activity and nitrotyrosine formation. In contrast, eNO concentration was significantly increased by allopurinol administration. These results suggest that oral administration of the xanthine oxidase inhibitor allopurinol reduces airway reactive nitrogen species production in chronic obstructive pulmonary disease subjects. This intervention may be useful in the future management of chronic obstructive pulmonary disease.
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Affiliation(s)
- M Ichinose
- Third Dept of Internal Medicine, Wakayama Medical University, Wakayama, Japan.
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Koarai A, Ichinose M, Sugiura H, Tomaki M, Watanabe M, Yamagata S, Komaki Y, Shirato K, Hattori T. iNOS depletion completely diminishes reactive nitrogen-species formation after an allergic response. Eur Respir J 2002; 20:609-16. [PMID: 12358336 DOI: 10.1183/09031936.02.00274902] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Nitric oxide (NO) shows proinflammatory actions mainly via reactive nitrogen species (RNS) formation through superoxide- and peroxidase-dependent mechanisms. The purpose of this study was to examine the role of inducible NO synthase (iNOS) in RNS production, airway hyperresponsiveness, and inflammation after allergen challenge. Ovalbumin (OVA)-sensitised, iNOS-deficient and wild-type mice were used. RNS production was assessed by nitrotyrosine (NT) immunoreactivity in the airways. Airway inflammation and responsiveness were evaluated by eosinophil accumulation and methacholine (i.v.) challenge, respectively. In wild-type mice, OVA-inhalation challenge increased iNOS immunoreactivity in airway epithelial cells as well as iNOS protein measured by Western blotting. The total amounts of nitrite and nitrate in bronchoalveolar lavage (BAL) fluid were increased, and NT immunoreactivity was also observed abundantly in airway inflammatory cells. In iNOS-deficient mice, both iNOS expression and NT formation were completely abolished, and the total amounts of nitrite and nitrate in BAL fluid were significantly decreased. In contrast, OVA-induced airway eosinophil recruitment and hyperresponsiveness were observed almost equally in wild-type and iNOS-deficient mice. These data suggest that reactive nitrogen species production after allergic reaction occurs totally via inducible nitric oxide synthase-dependent pathways. Allergen-mediated airway eosinophil recruitment and hyperresponsiveness appear to be independent of reactive nitrogen species production.
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Affiliation(s)
- A Koarai
- Division of Respiratory and Infectious Diseases, Tohoku University Graduate School of Medicine, Sendai, Japan
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Abstract
A method has been developed for the chemical etching of fission tracks in polyfluoro plastics. The formation of fine holes several tens of nanometers in diameter in polyvinylidene fluoride films, bombarded by fission fragments in oxygen and etched in 5-normal sodium hydroxide solution at 85 degrees C, was confirmed by electron microscopy.
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