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Huang R, Huang CH, Chen J, Yan ZY, Tang M, Shao J, Cai K, Zhu BZ. Unprecedented enantio-selective live-cell mitochondrial DNA super-resolution imaging and photo-sensitizing by the chiral ruthenium polypyridyl DNA "light-switch". Nucleic Acids Res 2023; 51:11981-11998. [PMID: 37933856 PMCID: PMC10711558 DOI: 10.1093/nar/gkad799] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2022] [Revised: 07/25/2023] [Accepted: 09/19/2023] [Indexed: 11/08/2023] Open
Abstract
Mitochondrial DNA (mtDNA) is known to play a critical role in cellular functions. However, the fluorescent probe enantio-selectively targeting live-cell mtDNA is rare. We recently found that the well-known DNA 'light-switch' [Ru(phen)2dppz]Cl2 can image nuclear DNA in live-cells with chlorophenolic counter-anions via forming lipophilic ion-pairing complex. Interestingly, after washing with fresh-medium, [Ru(phen)2dppz]Cl2 was found to re-localize from nucleus to mitochondria via ABC transporter proteins. Intriguingly, the two enantiomers of [Ru(phen)2dppz]Cl2 were found to bind enantio-selectively with mtDNA in live-cells not only by super-resolution optical microscopy techniques (SIM, STED), but also by biochemical methods (mitochondrial membrane staining with Tomo20-dronpa). Using [Ru(phen)2dppz]Cl2 as the new mtDNA probe, we further found that each mitochondrion containing 1-8 mtDNA molecules are distributed throughout the entire mitochondrial matrix, and there are more nucleoids near nucleus. More interestingly, we found enantio-selective apoptotic cell death was induced by the two enantiomers by prolonged visible light irradiation, and in-situ self-monitoring apoptosis process can be achieved by using the unique 'photo-triggered nuclear translocation' property of the Ru complex. This is the first report on enantio-selective targeting and super-resolution imaging of live-cell mtDNA by a chiral Ru complex via formation and dissociation of ion-pairing complex with suitable counter-anions.
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Affiliation(s)
- Rong Huang
- Key Laboratory of Biorheological Science and Technology, Ministry of Education, College of Bioengineering, Chongqing University, Chongqing 400044, China
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, and University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Chun-Hua Huang
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, and University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Jing Chen
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, and University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Zhu-Ying Yan
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, and University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100085, China
- State Key Laboratory of Food Science and Resources, Jiangnan University, Wuxi 214122, China
| | - Miao Tang
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, and University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Jie Shao
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, and University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Kaiyong Cai
- Key Laboratory of Biorheological Science and Technology, Ministry of Education, College of Bioengineering, Chongqing University, Chongqing 400044, China
| | - Ben-Zhan Zhu
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, and University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100085, China
- College of Environmental Science and Technology, Shandong University, Qingdao, Shandong 266237, PR China
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2
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Shen C, Sheng ZG, Shao J, Tang M, Mao L, Huang CH, Zhang ZH, Zhu BZ. Mechanistic investigation of the differential synergistic neurotoxicity between pesticide metam sodium and copper or zinc. CHEMOSPHERE 2023; 328:138430. [PMID: 36963585 DOI: 10.1016/j.chemosphere.2023.138430] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2022] [Revised: 02/21/2023] [Accepted: 03/15/2023] [Indexed: 06/18/2023]
Abstract
Epidemiological studies suggest neurological disorders have been associated with the co-exposure to certain pesticides and transition metals. The present study aims to investigate whether co-exposure to the widely-used pesticide metam sodium and copper (Cu2+) or zinc ion (Zn2+) is able to cause synergistic neurotoxicity in neural PC12 cells and its possible mechanism(s). We found that both metam/Cu2+ and metam/Zn2+ synergistically induced apoptosis, intracellular Cu2+/Zn2+ uptake, reactive oxygen species (ROS) accumulation, double-strand DNA breakage, mitochondrial membrane potential decrease, and nerve function disorder. In addition, metam/Cu2+ was shown to release cytochrome c and apoptosis-inducing factor (AIF) from mitochondria to cytoplasm and nucleus, respectively, and activate the caspase 9, 8, 3, 7. However, metam/Zn2+ induced caspase 7 activation and AIF translocation and mildly activated cytochrome c/caspase 9/caspase 3 pathway. Furthermore, metam/Cu2+ activated caspase 3/7 by the p38 pathway, whereas metam/Zn2+ did so via both the p38 and JNK pathways. These results demonstrated that metam/Cu2+ or metam/Zn2+ co-exposure cause synergistic neurotoxicity via different mechanisms, indicating a potential risk to human health when they environmentally co-exist.
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Affiliation(s)
- Chen Shen
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, and University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing, 100085, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Zhi-Guo Sheng
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, and University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing, 100085, China; University of Chinese Academy of Sciences, Beijing, 100049, China.
| | - Jie Shao
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, and University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing, 100085, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Miao Tang
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, and University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing, 100085, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Li Mao
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, and University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing, 100085, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Chun-Hua Huang
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, and University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing, 100085, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Zhi-Hui Zhang
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, and University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing, 100085, China; Department of Stomatology, Peking University Third Hospital, Beijing, 100191, China
| | - Ben-Zhan Zhu
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, and University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing, 100085, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Joint Institute for Environmental Science, Research Center for Eco-Environmental Sciences and Hong Kong Baptist University, Hong Kong, China.
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3
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Qin L, Huang CH, Liu CQ, Zhao CF, Li PL, Tang TS, Li J, Xie LN, Shao B, Shao J, Mao L, Li R, Zhang L, Zhu BZ. Molecular mechanism for the activation of the potent hepatotoxin acetylhydrazine: Identification of the initial N-centered radical and the secondary C-centered radical intermediates. Free Radic Biol Med 2023; 204:20-27. [PMID: 37094755 DOI: 10.1016/j.freeradbiomed.2023.04.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/05/2022] [Revised: 04/06/2023] [Accepted: 04/19/2023] [Indexed: 04/26/2023]
Abstract
Acetylhydrazine (AcHZ), a major human metabolite of the widely-used anti-tuberculosis drug isoniazid (INH), was considered to be responsible for its serious hepatotoxicity and potentially fatal liver injury. It has been proposed that reactive radical species produced from further metabolic activation of AcHZ might be responsible for its hepatotoxicity. However, the exact nature of such radical species remains not clear. Through complementary applications of ESR spin-trapping and HPLC/MS methods, here we show that the initial N-centered radical intermediate can be detected and identified from AcHZ activated by transition metal ions (Mn(III)Acetate and Mn(III) pyrophosphate) and myeloperoxidase. The exact location of the radical was found to be at the distal-nitrogen of the hydrazine group by 15N-isotope-labeling techniques via using 15N-labeled AcHZ we synthesized. Additionally, the secondary C-centered radical was identified unequivocally as the reactive acetyl radical by complementary applications of ESR spin-trapping and persistent radical TEMPO trapping coupled with HPLC/MS analysis. This study represents the first detection and unequivocal identification of the initial N-centered radical and its exact location, as well as the reactive secondary acetyl radical. These findings should provide new perspectives on the molecular mechanism of AcHZ activation, which may have potential biomedical and toxicological significance for future research on the mechanism of INH-induced hepatotoxicity.
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Affiliation(s)
- Li Qin
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, School of Resources and Environment, The University of the Chinese Academy of Sciences, The Chinese Academy of Sciences, Beijing, 100085, PR China; School of Public Health, Zhejiang Chinese Medical University, Hangzhou, 310053, China
| | - Chun-Hua Huang
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, School of Resources and Environment, The University of the Chinese Academy of Sciences, The Chinese Academy of Sciences, Beijing, 100085, PR China.
| | - Cui-Qing Liu
- School of Public Health, Zhejiang Chinese Medical University, Hangzhou, 310053, China
| | - Chuan-Fang Zhao
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, School of Resources and Environment, The University of the Chinese Academy of Sciences, The Chinese Academy of Sciences, Beijing, 100085, PR China
| | - Pei-Lin Li
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, School of Resources and Environment, The University of the Chinese Academy of Sciences, The Chinese Academy of Sciences, Beijing, 100085, PR China
| | - Tian-Shu Tang
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, School of Resources and Environment, The University of the Chinese Academy of Sciences, The Chinese Academy of Sciences, Beijing, 100085, PR China
| | - Jun Li
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, School of Resources and Environment, The University of the Chinese Academy of Sciences, The Chinese Academy of Sciences, Beijing, 100085, PR China
| | - Lin-Na Xie
- National Institute of Environmental Health, Chinese Center for Disease Control and Prevention, Beijing, 100021, China
| | - Bo Shao
- School of Public Health, Jining Medical University, Jining, Shandong, 272067, PR China
| | - Jie Shao
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, School of Resources and Environment, The University of the Chinese Academy of Sciences, The Chinese Academy of Sciences, Beijing, 100085, PR China
| | - Li Mao
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, School of Resources and Environment, The University of the Chinese Academy of Sciences, The Chinese Academy of Sciences, Beijing, 100085, PR China
| | - Ran Li
- School of Public Health, Zhejiang Chinese Medical University, Hangzhou, 310053, China
| | - Lu Zhang
- School of Public Health, Zhejiang Chinese Medical University, Hangzhou, 310053, China
| | - Ben-Zhan Zhu
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, School of Resources and Environment, The University of the Chinese Academy of Sciences, The Chinese Academy of Sciences, Beijing, 100085, PR China; School of Resources and Environment, The University of the Chinese Academy of Sciences, The Chinese Academy of Sciences, Beijing, PR China.
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4
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Qin M, Shao B, Lin L, Zhang ZQ, Sheng ZG, Qin L, Shao J, Zhu BZ. Molecular mechanism of the unusual biphasic effects of the natural compound hinokitiol on iron-induced cellular DNA damage. Free Radic Biol Med 2023; 194:163-171. [PMID: 36476568 DOI: 10.1016/j.freeradbiomed.2022.11.042] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/16/2022] [Revised: 11/19/2022] [Accepted: 11/29/2022] [Indexed: 12/12/2022]
Abstract
Hinokitiol is a natural monoterpene compound found in the heartwood of cupressaceous plants that have anticancer and anti-inflammatory properties. However, few studies have focused on its effect on iron-mediated cellular DNA damage. Here we show that hinokitiol exhibited unusual biphasic effects on iron-induced DNA damage in a molar ratio (hinokitiol/iron) dependent manner in HeLa cells. Under low ratios (<3:1), hinokitiol markedly enhanced DNA damage induced by Fe(II) or Fe(II)-H2O2; However, when the ratios increased over 3:1, the DNA damage was progressively inhibited. We found that the total cytoplasmic and nuclear iron concentration increased as the ratios of hinokitiol/iron increased. However, the cellular level of labile iron pool (LIP) only increased at ratios lower than 3, and the ROS generation is consistent with LIP change. Hinokitiol was found to interact with iron to form lipophilic hinokitiol-iron complexes with different stoichiometry and redox-activity by complementary applications of various analytical methods. Taken together, we propose that the enhancement of iron-induced cellular DNA damage by hinokitiol at low ratios (<3:1) was due to formation of lipophilic and redox-active iron complexes which facilitated cellular iron uptake and •OH production, while the inhibition at ratios higher than 3 was due to formation of redox-inactive iron complexes. These new findings will help us to design more effective drugs for the prevention and treatment of a series of iron-related diseases via regulating the two critical physicochemical factors (lipophilicity and redox activity of iron complexes) by simple natural compounds with iron-chelating properties.
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Affiliation(s)
- Miao Qin
- School of Public Health, Weifang Medical University, Weifang, Shandong, 261053, China; School of Public Health, Jining Medical University, Jining, Shandong, 272013, China; State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
| | - Bo Shao
- School of Public Health, Weifang Medical University, Weifang, Shandong, 261053, China; School of Public Health, Jining Medical University, Jining, Shandong, 272013, China; State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China.
| | - Li Lin
- School of Public Health, Weifang Medical University, Weifang, Shandong, 261053, China; School of Public Health, Jining Medical University, Jining, Shandong, 272013, China
| | - Zhao-Qiang Zhang
- School of Public Health, Jining Medical University, Jining, Shandong, 272013, China
| | - Zhi-Guo Sheng
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China; School of Resources and Environment, The University of Chinese Academy of Sciences, Beijing, China
| | - Li Qin
- School of Public Health, Zhejiang Chinese Medical University, Hangzhou, 310053, China
| | - Jie Shao
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China; School of Resources and Environment, The University of Chinese Academy of Sciences, Beijing, China
| | - Ben-Zhan Zhu
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China; School of Resources and Environment, The University of Chinese Academy of Sciences, Beijing, China.
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5
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Huang CH, Tang M, Xu D, Shao B, Li PL, Tang TS, Qin L, Zhu BZ. The critical role of unique azido-substituted chloro-O-semiquinone radical intermediates in the synergistic toxicity between sodium azide and chlorocatecholic carcinogens. Free Radic Biol Med 2021; 177:260-269. [PMID: 34673144 DOI: 10.1016/j.freeradbiomed.2021.08.244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/31/2021] [Revised: 08/26/2021] [Accepted: 08/30/2021] [Indexed: 10/20/2022]
Abstract
We have shown previously that exposing bacteria to tetrachlorocatechol (TCC) and sodium azide (NaN3) together causes synergistic cytotoxicity in a biphasic mode. However, the underlying chemical mechanism remains unclear. In this study, an unexpected ring-contraction 3(2H)-furanone and two quinoid-compounds were identified as the major and minor reaction products, respectively; and two unusual azido-substituted chloro-O-semiquinone radicals were detected and characterized as the major radical intermediates by complementary applications of direct ESR, HPLC/ESI-Q-TOF and high-resolution MS studies with nitrogen-15 isotope-labeled NaN3. Taken together, we proposed a novel molecular mechanism for the reaction of TCC/NaN3: N3- may attack on tetrachloro-O-semiquinone radical, forming two transient 4-azido-3,5,6-trichloro- and 4,5-diazido-3,6-dichloro-O-semiquinone radicals, consecutively. The second-radical intermediate may either undergo an unusual zwitt-azido cleavage to form the less-toxic ring-contraction 3(2H)-furanone product, or further oxidize to form the more toxic quinoid-product 4-amino-5-azido-3,6-dichloro-O-benzoquinone. A good correlation was observed between the biphasic formation of this toxic quinone due to the two competing decomposition pathways of the radical intermediate and the biphasic synergism between TCC and NaN3, which are dependent on their molar-ratios. This is the first report of detection and identification of two unique azido-substituted chloro-O-semiquinone radicals, and an unprecedented ring-contraction mechanism via an unusually mild and facile zwitt-azido rearrangement.
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Affiliation(s)
- Chun-Hua Huang
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, The Chinese Academy of Sciences, Beijing, 100085, PR China; University of Chinese Academy of Sciences, Beijing, 100049, PR China.
| | - Miao Tang
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, The Chinese Academy of Sciences, Beijing, 100085, PR China; University of Chinese Academy of Sciences, Beijing, 100049, PR China
| | - Dan Xu
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, The Chinese Academy of Sciences, Beijing, 100085, PR China; University of Chinese Academy of Sciences, Beijing, 100049, PR China; Technical Center of Zhengzhou Customs District, Zhengzhou, 450003, Henan, PR China
| | - Bo Shao
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, The Chinese Academy of Sciences, Beijing, 100085, PR China
| | - Pei-Lin Li
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, The Chinese Academy of Sciences, Beijing, 100085, PR China; University of Chinese Academy of Sciences, Beijing, 100049, PR China
| | - Tian-Shu Tang
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, The Chinese Academy of Sciences, Beijing, 100085, PR China; University of Chinese Academy of Sciences, Beijing, 100049, PR China
| | - Li Qin
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, The Chinese Academy of Sciences, Beijing, 100085, PR China; University of Chinese Academy of Sciences, Beijing, 100049, PR China
| | - Ben-Zhan Zhu
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, The Chinese Academy of Sciences, Beijing, 100085, PR China; University of Chinese Academy of Sciences, Beijing, 100049, PR China; Joint Institute for Environmental Science, Research Center for Eco-Environmental Sciences and Hong Kong Baptist University, Beijing, Hong Kong, China.
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6
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Zhu BZ, Tang M, Huang CH, Mao L, Shao J. Mechanistic Study on Oxidative DNA Damage and Modifications by Haloquinoid Carcinogenic Intermediates and Disinfection Byproducts. Chem Res Toxicol 2021; 34:1701-1712. [PMID: 34143619 DOI: 10.1021/acs.chemrestox.1c00158] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Haloquinones (XQs) are a group of carcinogenic intermediates of the haloaromatic environmental pollutants and newly identified chlorination disinfection byproducts (DBPs) in drinking water. The highly reactive hydroxyl radicals/alkoxyl radicals and quinone enoxy/ketoxy radicals were found to arise in XQs and H2O2 or organic hydroperoxides system, independent of transition-metal ions. However, it was not clear whether these haloquinoid carcinogens and hydroperoxides can cause oxidative DNA damage and modifications, and if so, what are the underlying molecular mechanisms. We found that 8-oxodeoxyguanosine (8-oxodG), DNA strand breaks, and three methyl oxidation products could arise when DNA was treated with tetrachloro-1,4-benzoquinone and H2O2 via a metal-independent and intercalation-enhanced oxidation mechanism. Similar effects were observed with other XQs, which are generally more efficient than the typical Fenton system. We further extended our studies from isolated DNA to genomic DNA in living cells. We also found that potent oxidation of DNA to the more mutagenic imidazolone dIz could be induced by XQs and organic hydroperoxides such as t-butylhydroperoxide or the physiologically relevant hydroperoxide 13S-hydroperoxy-9Z,11E-octadecadienoic acid via an unprecedented quinone-enoxy radical-mediated mechanism. These findings should provide new perspectives to explain the potential genotoxicity, mutagenesis, and carcinogenicity for the ubiquitous haloquinoid carcinogenic intermediates and DBPs.
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Affiliation(s)
- Ben-Zhan Zhu
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, P.R. China.,University of Chinese Academy of Sciences, Beijing 100049, P.R. China
| | - Miao Tang
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, P.R. China.,University of Chinese Academy of Sciences, Beijing 100049, P.R. China
| | - Chun-Hua Huang
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, P.R. China.,University of Chinese Academy of Sciences, Beijing 100049, P.R. China
| | - Li Mao
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, P.R. China.,University of Chinese Academy of Sciences, Beijing 100049, P.R. China
| | - Jie Shao
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, P.R. China.,University of Chinese Academy of Sciences, Beijing 100049, P.R. China
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Hachey AC, Havrylyuk D, Glazer EC. Biological activities of polypyridyl-type ligands: implications for bioinorganic chemistry and light-activated metal complexes. Curr Opin Chem Biol 2021; 61:191-202. [PMID: 33799087 DOI: 10.1016/j.cbpa.2021.01.016] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2020] [Revised: 01/24/2021] [Accepted: 01/31/2021] [Indexed: 12/16/2022]
Abstract
Polypyridyl coordinating ligands are common in metal complexes used in medicinal inorganic chemistry. These ligands possess intrinsic cytotoxicity, but detailed data on this phenomenon are sparse, and cytotoxicity values vary widely and are often irreproducible. To provide new insights into the biological effects of bipyridyl-type ligands and structurally related metal-binding systems, reports of free ligand cytotoxicity were reviewed. The cytotoxicity of 25 derivatives of 2,2'-bipyridine and 1,10-phenanthroline demonstrates that there is no correlation between IC50 values and ligand properties such as pKa, log D, polarizability volume, and electron density, as indicated by NMR shifts. As a result of these observations, as well as the various reported mechanisms of action of polypyridyl ligands, we offer the hypothesis that biological effects are governed by the availability of and affinity for specific metal ions within the experimental model.
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Affiliation(s)
- Austin C Hachey
- Department of Chemistry, The University of Kentucky, 505 Rose St, Lexington, KY 40506, USA
| | - Dmytro Havrylyuk
- Department of Chemistry, The University of Kentucky, 505 Rose St, Lexington, KY 40506, USA
| | - Edith C Glazer
- Department of Chemistry, The University of Kentucky, 505 Rose St, Lexington, KY 40506, USA.
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8
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Shao J, Yan ZY, Tang M, Huang CH, Sheng ZG, Chen J, Shao B, Zhu BZ. Potent oxidation of DNA by Ru(ii) tri(polypyridyl) complexes under visible light irradiation via a singlet oxygen-mediated mechanism. Inorg Chem Front 2021. [DOI: 10.1039/d0qi01518k] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The irradiation of Ru(ii) tri(polypridyl) complexes with visible light can induce potent oxidation of DNA mediated by 1O2via a type II photosensitization mechanism.
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Affiliation(s)
- Jie Shao
- State Key Laboratory of Environmental Chemistry and Eco-toxicology
- Research Centre for Eco-environmental Sciences and University of the Chinese Academy of Sciences
- the Chinese Academy of Sciences
- Beijing 100085
- PR China
| | - Zhu-Ying Yan
- State Key Laboratory of Environmental Chemistry and Eco-toxicology
- Research Centre for Eco-environmental Sciences and University of the Chinese Academy of Sciences
- the Chinese Academy of Sciences
- Beijing 100085
- PR China
| | - Miao Tang
- State Key Laboratory of Environmental Chemistry and Eco-toxicology
- Research Centre for Eco-environmental Sciences and University of the Chinese Academy of Sciences
- the Chinese Academy of Sciences
- Beijing 100085
- PR China
| | - Chun-Hua Huang
- State Key Laboratory of Environmental Chemistry and Eco-toxicology
- Research Centre for Eco-environmental Sciences and University of the Chinese Academy of Sciences
- the Chinese Academy of Sciences
- Beijing 100085
- PR China
| | - Zhi-Guo Sheng
- State Key Laboratory of Environmental Chemistry and Eco-toxicology
- Research Centre for Eco-environmental Sciences and University of the Chinese Academy of Sciences
- the Chinese Academy of Sciences
- Beijing 100085
- PR China
| | - Jing Chen
- State Key Laboratory of Environmental Chemistry and Eco-toxicology
- Research Centre for Eco-environmental Sciences and University of the Chinese Academy of Sciences
- the Chinese Academy of Sciences
- Beijing 100085
- PR China
| | - Bo Shao
- State Key Laboratory of Environmental Chemistry and Eco-toxicology
- Research Centre for Eco-environmental Sciences and University of the Chinese Academy of Sciences
- the Chinese Academy of Sciences
- Beijing 100085
- PR China
| | - Ben-Zhan Zhu
- State Key Laboratory of Environmental Chemistry and Eco-toxicology
- Research Centre for Eco-environmental Sciences and University of the Chinese Academy of Sciences
- the Chinese Academy of Sciences
- Beijing 100085
- PR China
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9
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Qin L, Huang CH, Mao L, Shao B, Zhu BZ. First unequivocal identification of the critical acyl radicals from the anti-tuberculosis drug isoniazid and its hydrazide analogs by complementary applications of ESR spin-trapping and HPLC/MS methods. Free Radic Biol Med 2020; 154:1-8. [PMID: 32360612 DOI: 10.1016/j.freeradbiomed.2020.04.021] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/10/2020] [Revised: 04/17/2020] [Accepted: 04/23/2020] [Indexed: 10/24/2022]
Abstract
The carbon-centered isonicotinic acyl radical of isoniazid (INH), a widely-used frontline anti-tuberculosis drug, has been considered to play a critical role in inhibiting Mycobacterium tuberculosis, but not fully identified. Here we show that this radical intermediate can be unequivocally characterized by complementary applications of ESR spin-trapping and HPLC/MS methods by employing N-tert-butyl-α-phenylnitrone (PBN) as the suitable spin-trapping agent, which can form the most stable radical adduct. More importantly, for the first time, analogous carbon-centered acyl radicals and their respective NAD+ adducts have also been detected and identified from its two isomers (nicotinic acid hydrazide and 2-pyridinecarbohydrazide) and benzhydrazide which are structurally-related to INH, but not by 2-chloroisonicotinohydrazide. This study represents the first unequivocal identification of the carbon-centered acyl radicals of INH and other hydrazide analogs by both ESR spin-trapping and HPLC/MS methods, which may have broad biomedical and toxicological significance for future research for more efficient hydrazide anti-tuberculosis drugs.
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Affiliation(s)
- Li Qin
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, PR China; University of Chinese Academy of Sciences, Beijing, 100049, PR China
| | - Chun-Hua Huang
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, PR China; University of Chinese Academy of Sciences, Beijing, 100049, PR China.
| | - Li Mao
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, PR China; University of Chinese Academy of Sciences, Beijing, 100049, PR China
| | - Bo Shao
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, PR China; School of Public Health, Jining Medical University, Jining, Shandong, 272067, PR China
| | - Ben-Zhan Zhu
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, PR China; University of Chinese Academy of Sciences, Beijing, 100049, PR China; Joint Institute for Environmental Science, Research Center for Eco-Environmental Sciences and Hong Kong Baptist University, Beijing/Hong Kong, PR China.
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10
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Gaál A, Garay TM, Horváth I, Máthé D, Szöllősi D, Veres DS, Mbuotidem J, Kovács T, Tóvári J, Bergmann R, Streli C, Szakács G, Mihály J, Varga Z, Szoboszlai N. Development and In Vivo Application of a Water-Soluble Anticancer Copper Ionophore System Using a Temperature-Sensitive Liposome Formulation. Pharmaceutics 2020; 12:pharmaceutics12050466. [PMID: 32443790 PMCID: PMC7284829 DOI: 10.3390/pharmaceutics12050466] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Revised: 05/01/2020] [Accepted: 05/15/2020] [Indexed: 12/13/2022] Open
Abstract
Liposomes containing copper and the copper ionophore neocuproine were prepared and characterized for in vitro and in vivo anticancer activity. Thermosensitive PEGylated liposomes were prepared with different molar ratios of 1,2-dipalmitoyl-sn-glycero-3-phosphatidylcholine (DPPC) and hydrogenated soybean phosphatidylcholine (HSPC) in the presence of copper(II) ions. Optimal, temperature dependent drug release was obtained at 70:30 DPPC to HSPC weight ratio. Neocuproine (applied at 0.2 mol to 1 mol phospholipid) was encapsulated through a pH gradient while using unbuffered solution at pH 4.5 inside the liposomes, and 100 mM HEPES buffer pH 7.8 outside the liposomes. Copper ions were present in excess, yielding 0.5 mM copper-(neocuproine)2 complex and 0.5 mM free copper. Pre-heating to 45 °C increased the toxicity of the heat-sensitive liposomes in short-term in vitro experiments, whereas at 72 h all investigated liposomes exhibited similar in vitro toxicity to the copper(II)-neocuproine complex (1:1 ratio). Thermosensitive liposomes were found to be more effective in reducing tumor growth in BALB/c mice engrafted with C26 cancer cells, regardless of the mild hyperthermic treatment. Copper uptake of the tumor was verified by PET/CT imaging following treatment with [64Cu]Cu-neocuproine liposomes. Taken together, our results demonstrate the feasibility of targeting a copper nanotoxin that was encapsulated in thermosensitive liposomes containing an excess of copper.
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Affiliation(s)
- Anikó Gaál
- Biological Nanochemistry Research Group, Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Magyar Tudósok Körútja 2, H-1117 Budapest, Hungary; (A.G.); (J.M.)
| | - Tamás M. Garay
- Faculty of Information Technology and Bionics, Pázmány Péter Catholic University, H-1083 Budapest, Práter utca 50/a, Hungary
- 1st Department of Internal Medicine and Oncology, Semmelweis University, H-1083 Budapest, Hungary
- Correspondence: (T.M.G.); (Z.V.); (N.S.); Tel.: +36-1-8864-769 (T.M.G.); +36-1-382-6568 (Z.V.); +36-1-372-2500 (ext. 6430) (N.S.)
| | - Ildikó Horváth
- Department of Biophysics and Radiation Biology, Semmelweis University, H-1094 Budapest, Hungary; (I.H.); (D.M.); (D.S.); (D.S.V.); (R.B.)
| | - Domokos Máthé
- Department of Biophysics and Radiation Biology, Semmelweis University, H-1094 Budapest, Hungary; (I.H.); (D.M.); (D.S.); (D.S.V.); (R.B.)
- CROmed Translational Research Centers Ltd., H-1047 Budapest, Hungary
| | - Dávid Szöllősi
- Department of Biophysics and Radiation Biology, Semmelweis University, H-1094 Budapest, Hungary; (I.H.); (D.M.); (D.S.); (D.S.V.); (R.B.)
| | - Dániel S. Veres
- Department of Biophysics and Radiation Biology, Semmelweis University, H-1094 Budapest, Hungary; (I.H.); (D.M.); (D.S.); (D.S.V.); (R.B.)
| | - Jeremiah Mbuotidem
- Institute of Translational Medicine, Semmelweis University, H-1094 Budapest, Hungary;
| | - Tibor Kovács
- Institute of Radiochemistry and Radioecology, University of Pannonia, H-8200 Veszprém, Hungary;
| | - József Tóvári
- Department of Experimental Pharmacology, National Institute of Oncology, H-1122 Budapest, Hungary;
| | - Ralf Bergmann
- Department of Biophysics and Radiation Biology, Semmelweis University, H-1094 Budapest, Hungary; (I.H.); (D.M.); (D.S.); (D.S.V.); (R.B.)
- Helmholz-Zentrum Dresden-Rossendorf, Institute of Radiopharmaceutical Cancer Research, D-01328 Dresden, Germany
| | - Christina Streli
- Institute of Atomic and Subatomic Physics, Atominstitut, TU Wien, A-1020 Vienna, Stadionallee 2, Austria;
| | - Gergely Szakács
- Institute of Enzymology, Research Centre for Natural Sciences, Magyar tudósok körútja 2, H-1117 Budapest, Hungary;
- Institute of Cancer Research, Medical University Vienna, A-1090 Vienna, Austria
| | - Judith Mihály
- Biological Nanochemistry Research Group, Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Magyar Tudósok Körútja 2, H-1117 Budapest, Hungary; (A.G.); (J.M.)
| | - Zoltán Varga
- Biological Nanochemistry Research Group, Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Magyar Tudósok Körútja 2, H-1117 Budapest, Hungary; (A.G.); (J.M.)
- Correspondence: (T.M.G.); (Z.V.); (N.S.); Tel.: +36-1-8864-769 (T.M.G.); +36-1-382-6568 (Z.V.); +36-1-372-2500 (ext. 6430) (N.S.)
| | - Norbert Szoboszlai
- Laboratory for Environmental Chemistry and Bioanalytics, Institute of Chemistry, Eötvös Loránd University, H-1117 Budapest, Pázmány Péter Stny. 1/A, Hungary
- Correspondence: (T.M.G.); (Z.V.); (N.S.); Tel.: +36-1-8864-769 (T.M.G.); +36-1-382-6568 (Z.V.); +36-1-372-2500 (ext. 6430) (N.S.)
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11
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Huang R, Feng FP, Huang CH, Mao L, Tang M, Yan ZY, Shao B, Qin L, Xu T, Xue YH, Zhu BZ. Chiral Os(II) Polypyridyl Complexes as Enantioselective Nuclear DNA Imaging Agents Especially Suitable for Correlative High-Resolution Light and Electron Microscopy Studies. ACS APPLIED MATERIALS & INTERFACES 2020; 12:3465-3473. [PMID: 31913004 DOI: 10.1021/acsami.9b19776] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
The high-resolution technique transmission electron microscopy (TEM), with OsO4 as the traditional fixative, is an essential tool for cell biology and medicine. Although OsO4 has been extensively used, it is far from perfect because of its high volatility and toxicity. Os(II) polypyridyl complexes like [Os(phen)2(dppz)]2+ (phen = 1,10-phenanthroline; dppz = dipyridophenazine) are not only the well-known molecular DNA "light-switches" but also the potential ideal candidates for TEM studies. Here, we report that the cell-impermeable cationic [Os(phen)2(dppz)]2+ can be preferentially delivered into the live-cell nucleus through ion-pairing with chlorophenolate counter-anions, where it functions as an unparalleled enantioselective nuclear DNA imaging reagent especially suitable for correlative light and electron microscopy (CLEM) studies in both living and fixed cells, which can clearly visualize chromosome aggregation and decondensation during mitosis simultaneously. We propose that the chiral Os(II) polypyridyl complexes can be used as a distinctive group of enantioselective high-resolution CLEM imaging probes for live-cell nuclear DNA studies.
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Affiliation(s)
- Rong Huang
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences , Chinese Academy of Sciences , Beijing 100085 , P. R. China
- University of Chinese Academy of Sciences , Beijing 100049 , P. R. China
| | - Feng-Ping Feng
- National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics , Chinese Academy of Sciences , Beijing 100101 , China
| | - Chun-Hua Huang
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences , Chinese Academy of Sciences , Beijing 100085 , P. R. China
- University of Chinese Academy of Sciences , Beijing 100049 , P. R. China
| | - Li Mao
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences , Chinese Academy of Sciences , Beijing 100085 , P. R. China
- University of Chinese Academy of Sciences , Beijing 100049 , P. R. China
| | - Miao Tang
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences , Chinese Academy of Sciences , Beijing 100085 , P. R. China
- University of Chinese Academy of Sciences , Beijing 100049 , P. R. China
| | - Zhu-Ying Yan
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences , Chinese Academy of Sciences , Beijing 100085 , P. R. China
- University of Chinese Academy of Sciences , Beijing 100049 , P. R. China
| | - Bo Shao
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences , Chinese Academy of Sciences , Beijing 100085 , P. R. China
- University of Chinese Academy of Sciences , Beijing 100049 , P. R. China
| | - Li Qin
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences , Chinese Academy of Sciences , Beijing 100085 , P. R. China
- University of Chinese Academy of Sciences , Beijing 100049 , P. R. China
| | - Tao Xu
- University of Chinese Academy of Sciences , Beijing 100049 , P. R. China
- National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics , Chinese Academy of Sciences , Beijing 100101 , China
| | - Yan-Hong Xue
- National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics , Chinese Academy of Sciences , Beijing 100101 , China
| | - Ben-Zhan Zhu
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences , Chinese Academy of Sciences , Beijing 100085 , P. R. China
- University of Chinese Academy of Sciences , Beijing 100049 , P. R. China
- Joint Institute for Environmental Science , Research Center for Eco-Environmental Sciences and Hong Kong Baptist University , Kowloon 999077 , Hong Kong
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12
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Sheng ZG, Shen C, Fan RM, Chao XJ, Liu YX, Zhu BZ. The Critical Role of X Chromosome-Linked Inhibitor of Apoptosis (XIAP) in Differential Synergism Induced by Pentachlorophenol and Copper-1,10-Phenanthroline Complex in Normal and Cancer Liver Cells. Toxicol Sci 2018; 168:339-348. [DOI: 10.1093/toxsci/kfy307] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Affiliation(s)
- Zhi-Guo Sheng
- Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Chen Shen
- Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Rui-Mei Fan
- Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Xi-Juan Chao
- Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Yu-Xiang Liu
- College of Chemistry and Chemical Engineering, Xinjiang Normal University, Urumqi, Xinjiang 830054, China
| | - Ben-Zhan Zhu
- Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- Linus Pauling Institute, Oregon State University, Corvallis, Oregon 97331
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13
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Nunes EA, Manieri TM, Matias AC, Bertuchi FR, da Silva DA, Lago L, Sato RH, Cerchiaro G. Protective effects of neocuproine copper chelator against oxidative damage in NSC34 cells. MUTATION RESEARCH-GENETIC TOXICOLOGY AND ENVIRONMENTAL MUTAGENESIS 2018; 836:62-71. [DOI: 10.1016/j.mrgentox.2018.06.019] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2017] [Revised: 06/23/2018] [Accepted: 06/25/2018] [Indexed: 11/28/2022]
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14
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Gaál A, Orgován G, Mihucz VG, Pape I, Ingerle D, Streli C, Szoboszlai N. Metal transport capabilities of anticancer copper chelators. J Trace Elem Med Biol 2018; 47:79-88. [PMID: 29544811 DOI: 10.1016/j.jtemb.2018.01.011] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/15/2017] [Revised: 01/19/2018] [Accepted: 01/23/2018] [Indexed: 12/31/2022]
Abstract
In the present study, several Cu chelators [2,2'-biquinoline, 8-hydroxiquinoline (oxine), ammonium pyrrolidinedithiocarbamate (APDTC), Dp44mT, dithizone, neocuproine] were used to study Cu uptake, depletion and localization in different cancer cell lines. To better understand the concentration dependent fluctuations in the Cu intracellular metal content and Cu-dependent in vitro antiproliferative data, the conditional stability constants of the Cu complex species of the investigated ligands were calculated. Each investigated chelator increased the intracellular Cu content on HT-29 cells causing Cu accumulation depending on the amount of the free Cu(II). Copper accumulation was 159 times higher for Dp44mT compared to the control. Investigating a number of other transition metals, intracellular accumulation of Cd was observed only for two chelators. Intracellular Zn content slightly decreased (cca. 10%) for MCF-7 cells, while a dramatic decrease was observed on MDA-MB-231 ones (cca. 50%). A similar decrease was observed for HCT-116, while Zn depletion for HT-29 corresponded to cca. 20%. The IC50 values were registered for the investigated four cell lines at increasing external Cu(II) concentration, namely, MDA-MB-231 cells had the lowest IC50 values for Dp44mT ranging between 7 and 35 nM. Thus, Zn depletion could be associated with lower IC50 values. Copper depletion was observed for all ligands being less pronounced for Dp44mT and neocuproine. Copper localization and its colocalization with Zn were determined by μ-XRF imaging. Loose correlation (0.57) was observed for the MCF-7 cells independently of the applied chelator. Similarly, a weak correlation (0.47) was observed for HT-29 cells treated with Cu(II) and oxine. Colocalization of Cu and Zn in the nucleus of HT-29 cells was observed for Dp44mT (correlation coefficient of 0.85).
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Affiliation(s)
- Anikó Gaál
- Laboratory for Environmental Chemistry and Bioanalytics, Institute of Chemistry, Eötvös Loránd University, H-1117 Budapest, Pázmány Péter stny. 1/A, Hungary
| | - Gábor Orgován
- Department of Pharmaceutical Chemistry, Semmelweis University, H-1092 Budapest, Hőgyes Endre u. 9, Hungary; Research Group of Drugs of Abuse and Doping Agents, Hungarian Academy of Sciences, H-1092 Budapest, Hőgyes Endre u. 9, Hungary
| | - Victor G Mihucz
- Laboratory for Environmental Chemistry and Bioanalytics, Institute of Chemistry, Eötvös Loránd University, H-1117 Budapest, Pázmány Péter stny. 1/A, Hungary; Hungarian Satellite Trace Elements Institute to UNESCO, H-1117 Budapest, Pázmány Péter stny. 1/A, Hungary
| | - Ian Pape
- Diamond Light Source Ltd, Harwell Science and Innovation Campus, Didcot, OX11 0DE, United Kingdom
| | - Dieter Ingerle
- Atominstitut, Technische Universitaet Wien, A-1020 Vienna, Stadionallee 2, Austria
| | - Christina Streli
- Atominstitut, Technische Universitaet Wien, A-1020 Vienna, Stadionallee 2, Austria
| | - Norbert Szoboszlai
- Laboratory for Environmental Chemistry and Bioanalytics, Institute of Chemistry, Eötvös Loránd University, H-1117 Budapest, Pázmány Péter stny. 1/A, Hungary.
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15
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Li Y, Huang CH, Liu YX, Mao L, Zhu BZ. Detoxifying Polyhalogenated Catechols through a Copper-Chelating Agent by Forming Stable and Redox-Inactive Hydrogen-Bonded Complexes with an Unusual Perpendicular Structure. Chemistry 2014; 20:13028-33. [DOI: 10.1002/chem.201402833] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2014] [Revised: 06/12/2014] [Indexed: 12/13/2022]
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16
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Copper efflux is induced during anaerobic amino acid limitation in Escherichia coli to protect iron-sulfur cluster enzymes and biogenesis. J Bacteriol 2013; 195:4556-68. [PMID: 23893112 DOI: 10.1128/jb.00543-13] [Citation(s) in RCA: 81] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Adaptation to changing environments is essential to bacterial physiology. Here we report a unique role of the copper homeostasis system in adapting Escherichia coli to its host-relevant environment of anaerobiosis coupled with amino acid limitation. We found that expression of the copper/silver efflux pump CusCFBA was significantly upregulated during anaerobic amino acid limitation in E. coli without the supplement of exogenous copper. Inductively coupled plasma mass spectrometry analysis of the total intracellular copper content combined with transcriptional assay of the P(cusC)-lacZ reporter in the presence of specific Cu(I) chelators indicated that anaerobic amino acid limitation led to the accumulation of free Cu(I) in the periplasmic space of E. coli, resulting in Cu(I) toxicity. Cells lacking cusCFBA and another copper transporter, copA, under this condition displayed growth defects and reduced ATP production during fumarate respiration. Ectopic expression of the Fe-S cluster enzyme fumarate reductase (Frd), or supplementation with amino acids whose biosynthesis involves Fe-S cluster enzymes, rescued the poor growth of ΔcusC cells. Yet, Cu(I) treatment did not impair the Frd activity in vitro. Further studies revealed that the alternative Fe-S cluster biogenesis system Suf was induced during the anaerobic amino acid limitation, and ΔcusC enhanced this upregulation, indicating the impairment of the Fe-S cluster assembly machinery and the increased Fe-S cluster demands under this condition. Taken together, we conclude that the copper efflux system CusCFBA is induced during anaerobic amino acid limitation to protect Fe-S cluster enzymes and biogenesis from the endogenously originated Cu(I) toxicity, thus facilitating the physiological adaptation of E. coli.
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Arnal N, de Alaniz MJ, Marra CA. Carnosine and neocuproine as neutralizing agents for copper overload-induced damages in cultured human cells. Chem Biol Interact 2011; 192:257-63. [DOI: 10.1016/j.cbi.2011.03.017] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2010] [Revised: 12/28/2010] [Accepted: 03/28/2011] [Indexed: 12/11/2022]
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18
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The significance of copper chelators in clinical and experimental application. J Nutr Biochem 2011; 22:301-10. [DOI: 10.1016/j.jnutbio.2010.06.010] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2010] [Revised: 06/08/2010] [Accepted: 06/30/2010] [Indexed: 01/17/2023]
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19
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Xiao Y, Chen DI, Zhang X, Cui Q, Fan Y, Bi C, Dou QP. Molecular study on copper-mediated tumor proteasome inhibition and cell death. Int J Oncol 2010; 37:81-87. [PMID: 20514399 DOI: 10.3892/ijo_00000655] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
The metal ion copper is a cofactor essential for maintaining normal biological and physical functions in human beings. High copper levels have been found in variety of tumor tissues and are involved in tumor angiogenesis processes. The ubiquitin-proteasome system plays an important role in cell growth and apoptosis and has been shown as a novel target for cancer therapy. We previously reported that some organic copper complexes can inhibit the proteasomal chymotrypsin-like activity and induce apoptosis in human cancer cells and xenograft models. In the current study, we investigated the effect of oxidation status of copper, Cu(I) or Cu(II), on inhibition of proteasome activity, induction of apoptosis, and induction of reactive oxygen species (ROS) in human cancer cells. We report four major findings here: i) both Cu(I) and Cu(II) could inhibit the chymotrypsin-like activity of purified 20S proteasome, but Cu(I) was more potent than Cu(II), ii) purified 20S proteasome protein was able to reduce Cu(II) to Cu(I), suggesting that Cu(I) is the oxidation status of copper that directly reacts with the proteasome, iii) when complexed with the copper ligand neocuproine, Cu(I) showed higher ability to induce ROS production in cancer cells, compared with Cu(II), iv) addition of a ROS scavenger in the cancer cell culture-blocked copper-induced ROS generation, but did not overcome copper-mediated proteasome-inhibitory and cell death-inducing events, demonstrating the ROS-independent proteasome-inhibitory property of copper complexes.
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Affiliation(s)
- Yan Xiao
- The Prevention Program, Barbara Ann Karmanos Cancer Institute, and Department of Pathology, School of Medicine, Wayne State University, Detroit, MI 48201, USA.,Key Laboratory of Marine Chemistry Engineering and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China.,Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, P.R. China
| | - D I Chen
- The Prevention Program, Barbara Ann Karmanos Cancer Institute, and Department of Pathology, School of Medicine, Wayne State University, Detroit, MI 48201, USA
| | - Xia Zhang
- The Prevention Program, Barbara Ann Karmanos Cancer Institute, and Department of Pathology, School of Medicine, Wayne State University, Detroit, MI 48201, USA.,Key Laboratory of Marine Chemistry Engineering and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China
| | - Qiuzhi Cui
- The Prevention Program, Barbara Ann Karmanos Cancer Institute, and Department of Pathology, School of Medicine, Wayne State University, Detroit, MI 48201, USA
| | - Yuhua Fan
- Key Laboratory of Marine Chemistry Engineering and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China
| | - Caifeng Bi
- Key Laboratory of Marine Chemistry Engineering and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China
| | - Q Ping Dou
- The Prevention Program, Barbara Ann Karmanos Cancer Institute, and Department of Pathology, School of Medicine, Wayne State University, Detroit, MI 48201, USA
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20
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Chen SH, Lin JK, Liu SH, Liang YC, Lin-Shiau SY. Apoptosis of Cultured Astrocytes Induced by the Copper and Neocuproine Complex through Oxidative Stress and JNK Activation. Toxicol Sci 2007; 102:138-49. [DOI: 10.1093/toxsci/kfm292] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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21
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Caragounis A, Du T, Filiz G, Laughton K, Volitakis I, Sharples R, Cherny R, Masters C, Drew S, Hill A, Li QX, Crouch P, Barnham K, White A. Differential modulation of Alzheimer's disease amyloid beta-peptide accumulation by diverse classes of metal ligands. Biochem J 2007; 407:435-50. [PMID: 17680773 PMCID: PMC2275059 DOI: 10.1042/bj20070579] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Biometals have an important role in AD (Alzheimer's disease) and metal ligands have been investigated as potential therapeutic agents for treatment of AD. In recent studies the 8HQ (8-hydroxyquinoline) derivative CQ (clioquinol) has shown promising results in animal models and small clinical trials; however, the actual mode of action in vivo is still being investigated. We previously reported that CQ-metal complexes up-regulated MMP (matrix metalloprotease) activity in vitro by activating PI3K (phosphoinositide 3-kinase) and JNK (c-jun N-terminal kinase), and that the increased MMP activity resulted in enhanced degradation of secreted Abeta (amyloid beta) peptide. In the present study, we have further investigated the biochemical mechanisms by which metal ligands affect Abeta metabolism. To achieve this, we measured the effects of diverse metal ligands on cellular metal uptake and secreted Abeta levels in cell culture. We report that different classes of metal ligands including 8HQ and phenanthroline derivatives and the sulfur compound PDTC (pyrrolidine dithiocarbamate) elevated cellular metal levels (copper and zinc), and resulted in substantial loss of secreted Abeta. Generally, the ability to inhibit Abeta levels correlated with a higher lipid solubility of the ligands and their capacity to increase metal uptake. However, we also identified several ligands that potently inhibited Abeta levels while only inducing minimal change to cellular metal levels. Metal ligands that inhibited Abeta levels [e.g. CQ, 8HQ, NC (neocuproine), 1,10-phenanthroline and PDTC] induced metal-dependent activation of PI3K and JNK, resulting in JNK-mediated up-regulation of metalloprotease activity and subsequent loss of secreted Abeta. The findings in the present study show that diverse metal ligands with high lipid solubility can elevate cellular metal levels resulting in metalloprotease-dependent inhibition of Abeta. Given that a structurally diverse array of ligands was assessed, the results are consistent with the effects being due to metal transport rather than the chelating ligand interacting directly with a receptor.
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Affiliation(s)
- Aphrodite Caragounis
- *Department of Pathology, The University of Melbourne, Victoria 3010, Australia
- †The Mental Health Research Institute, Parkville, Victoria 3052, Australia
- ‡Centre for Neuroscience, The University of Melbourne, Victoria 3010, Australia
| | - Tai Du
- *Department of Pathology, The University of Melbourne, Victoria 3010, Australia
- †The Mental Health Research Institute, Parkville, Victoria 3052, Australia
- ‡Centre for Neuroscience, The University of Melbourne, Victoria 3010, Australia
| | - Gulay Filiz
- *Department of Pathology, The University of Melbourne, Victoria 3010, Australia
- †The Mental Health Research Institute, Parkville, Victoria 3052, Australia
- ‡Centre for Neuroscience, The University of Melbourne, Victoria 3010, Australia
| | - Katrina M. Laughton
- *Department of Pathology, The University of Melbourne, Victoria 3010, Australia
- †The Mental Health Research Institute, Parkville, Victoria 3052, Australia
| | - Irene Volitakis
- *Department of Pathology, The University of Melbourne, Victoria 3010, Australia
- ‡Centre for Neuroscience, The University of Melbourne, Victoria 3010, Australia
| | - Robyn A. Sharples
- *Department of Pathology, The University of Melbourne, Victoria 3010, Australia
- †The Mental Health Research Institute, Parkville, Victoria 3052, Australia
- §Bio21 Molecular Science and Biotechnology Institute, Parkville, Victoria 3052, Australia
- ∥Department of Biochemistry and Molecular Biology, The University of Melbourne, Victoria 3010, Australia
| | - Robert A. Cherny
- *Department of Pathology, The University of Melbourne, Victoria 3010, Australia
- †The Mental Health Research Institute, Parkville, Victoria 3052, Australia
| | - Colin L. Masters
- *Department of Pathology, The University of Melbourne, Victoria 3010, Australia
- †The Mental Health Research Institute, Parkville, Victoria 3052, Australia
- ‡Centre for Neuroscience, The University of Melbourne, Victoria 3010, Australia
| | - Simon C. Drew
- *Department of Pathology, The University of Melbourne, Victoria 3010, Australia
- †The Mental Health Research Institute, Parkville, Victoria 3052, Australia
- §Bio21 Molecular Science and Biotechnology Institute, Parkville, Victoria 3052, Australia
| | - Andrew F. Hill
- *Department of Pathology, The University of Melbourne, Victoria 3010, Australia
- †The Mental Health Research Institute, Parkville, Victoria 3052, Australia
- §Bio21 Molecular Science and Biotechnology Institute, Parkville, Victoria 3052, Australia
- ∥Department of Biochemistry and Molecular Biology, The University of Melbourne, Victoria 3010, Australia
| | - Qiao-Xin Li
- *Department of Pathology, The University of Melbourne, Victoria 3010, Australia
- †The Mental Health Research Institute, Parkville, Victoria 3052, Australia
| | - Peter J. Crouch
- *Department of Pathology, The University of Melbourne, Victoria 3010, Australia
- †The Mental Health Research Institute, Parkville, Victoria 3052, Australia
- ‡Centre for Neuroscience, The University of Melbourne, Victoria 3010, Australia
| | - Kevin J. Barnham
- *Department of Pathology, The University of Melbourne, Victoria 3010, Australia
- †The Mental Health Research Institute, Parkville, Victoria 3052, Australia
- §Bio21 Molecular Science and Biotechnology Institute, Parkville, Victoria 3052, Australia
| | - Anthony R. White
- *Department of Pathology, The University of Melbourne, Victoria 3010, Australia
- †The Mental Health Research Institute, Parkville, Victoria 3052, Australia
- ‡Centre for Neuroscience, The University of Melbourne, Victoria 3010, Australia
- To whom correspondence should be addressed (email )
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Shomron N, Malca H, Vig I, Ast G. Reversible inhibition of the second step of splicing suggests a possible role of zinc in the second step of splicing. Nucleic Acids Res 2002; 30:4127-37. [PMID: 12364591 PMCID: PMC140552 DOI: 10.1093/nar/gkf553] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
A multicomponent complex of proteins and RNA is assembled on the newly synthesized pre-mRNA to form the spliceosome. This complex catalyzes a two-step transesterification reaction required to remove the introns and ligate the exons. To date, only six proteins have been found necessary for the second step of splicing in yeast, and their human homologs have been identified. We demonstrate that the addition of the selective chelator of zinc, 1,10-phenanthroline, to an in vitro mRNA splicing reaction causes a dose-dependent inhibition of the second step of splicing. This inhibition is accompanied by the accumulation of spliceosomes paused before completion of step two of the splicing reaction. The inhibition effect on the second step is due neither to snRNA degradation nor to direct binding to the mRNA, and is reversible by dialysis or add-back of zinc, but not of other divalent metals, at the beginning of the reaction. These findings suggest that the activity of a putative zinc-dependent metalloprotein(s) involved in the second step of splicing is affected. This study outlines a new method for specific reversible inhibition of the second step of splicing using external reagents, and suggests a possible role of divalent cations in the second step of mRNA splicing, most likely zinc.
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Affiliation(s)
- Noam Shomron
- Department of Human Genetics and Molecular Medicine, Sackler School of Medicine, Tel Aviv University, Ramat Aviv 69978, Tel Aviv, Israel
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