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Li GJ, Wang C, Wang WD, Shang Y, Zeng CY, Wang AM, Bai JL, Su J, Su L, Si SY, Yu LY, Gan ML, Chen SZ. Chromomycins from soil-derived Streptomyces sp. inhibit the growth of human non-small cell lung cancer cells by targeting c-FLIP. JOURNAL OF ASIAN NATURAL PRODUCTS RESEARCH 2024:1-16. [PMID: 38975979 DOI: 10.1080/10286020.2024.2375288] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2024] [Accepted: 06/28/2024] [Indexed: 07/09/2024]
Abstract
Three chromomycin derivatives, chromomycins A3 (1, CA3), A5 (2, CA5), and monodeacetylchromomycin A3 (3, MDA-CA3), were identified from the soil-derived Streptomyces sp. CGMCC 26516. A reinvestigation of the structure of CA5 is reported, of which the absolute configuration was unambiguously determined for the first time to be identical with that of CA3 based on nuclear magnetic resonance (NMR) data analysis as well as NMR and electronic circular dichroism calculations. Compounds 1-3 showed potent cytotoxicity against the non-small-cell lung cancer (NSCLC) cells (A549, H460, H157-c-FLIP, and H157-LacZ) and down-regulated the protein expression of c-FLIP in A549 cells. The IC50 values of chromomycins in H157-c-FLIP were higher than that in H157-LacZ. Furthermore, si-c-FLIP promoted anti-proliferation effect of chromomycins in NSCLC cells. In nude mice xenograft model, 1 and 2 both showed more potent inhibition on the growth of H157-lacZ xenografts than that of H157-c-FLIP xenografts. These results verify that c-FLIP mediates the anticancer effects of chromomycins in NSCLC.
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Affiliation(s)
- Gao-Jie Li
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China
| | - Chen Wang
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China
| | - Wen-Die Wang
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China
| | - Yue Shang
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China
| | - Chao-Yang Zeng
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China
| | - Ai-Min Wang
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China
| | - Jing-Lin Bai
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China
| | - Jing Su
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China
| | - Ling Su
- School of Life Sciences, Shandong University School of Life Sciences, Jinan 250100, China
| | - Shu-Yi Si
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China
| | - Li-Yan Yu
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China
| | - Mao-Luo Gan
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China
| | - Shu-Zhen Chen
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China
- State Key Laboratory of Bioactive Substances and Functions of Natural MedicinesInstitute of Medicinal Biotechnology, Peking Union Medical College and Chinese Academy of Medical Sciences, , Beijing 100050, China
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Isagulieva AK, Tevyashova AN, Shtil AA. Aureolic Acid-Derived Antibiotics: Prospects for a Biologically Active Class. RUSSIAN JOURNAL OF BIOORGANIC CHEMISTRY 2022. [DOI: 10.1134/s1068162022020121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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3
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Jhan CR, Satange R, Wang SC, Zeng JY, Horng YC, Jin P, Neidle S, Hou MH. Targeting the ALS/FTD-associated A-DNA kink with anthracene-based metal complex causes DNA backbone straightening and groove contraction. Nucleic Acids Res 2021; 49:9526-9538. [PMID: 33836081 PMCID: PMC8450080 DOI: 10.1093/nar/gkab227] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Revised: 03/16/2021] [Accepted: 03/26/2021] [Indexed: 12/22/2022] Open
Abstract
The use of a small molecule compound to reduce toxic repeat RNA transcripts or their translated aberrant proteins to target repeat-expanded RNA/DNA with a G4C2 motif is a promising strategy to treat C9orf72-linked disorders. In this study, the crystal structures of DNA and RNA–DNA hybrid duplexes with the -GGGCCG- region as a G4C2 repeat motif were solved. Unusual groove widening and sharper bending of the G4C2 DNA duplex A-DNA conformation with B-form characteristics inside was observed. The G4C2 RNA–DNA hybrid duplex adopts a more typical rigid A form structure. Detailed structural analysis revealed that the G4C2 repeat motif of the DNA duplex exhibits a hydration shell and greater flexibility and serves as a ‘hot-spot’ for binding of the anthracene-based nickel complex, NiII(Chro)2 (Chro = Chromomycin A3). In addition to the original GGCC recognition site, NiII(Chro)2 has extended specificity and binds the flanked G:C base pairs of the GGCC core, resulting in minor groove contraction and straightening of the DNA backbone. We have also shown that Chro-metal complexes inhibit neuronal toxicity and suppresses locomotor deficits in a Drosophila model of C9orf72-associated ALS. The approach represents a new direction for drug discovery against ALS and FTD diseases by targeting G4C2 repeat motif DNA.
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Affiliation(s)
- Cyong-Ru Jhan
- Department of Life Sciences, National Chung-Hsing University, Taichung 402, Taiwan
| | - Roshan Satange
- Ph.D. Program in Medical Biotechnology, National Chung Hsing University, Taichung 402, Taiwan.,Institute of Genomics and Bioinformatics; National Chung Hsing University, Taichung 402, Taiwan
| | - Shun-Ching Wang
- Institute of Genomics and Bioinformatics; National Chung Hsing University, Taichung 402, Taiwan
| | - Jing-Yi Zeng
- Institute of Genomics and Bioinformatics; National Chung Hsing University, Taichung 402, Taiwan
| | - Yih-Chern Horng
- Department of Chemistry, National Changhua University of Education, Changhua 50058, Taiwan
| | - Peng Jin
- Department of Human Genetics, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Stephen Neidle
- The School of Pharmacy, University College London, London, WC1N 1AX, United Kingdom
| | - Ming-Hon Hou
- Department of Life Sciences, National Chung-Hsing University, Taichung 402, Taiwan.,Ph.D. Program in Medical Biotechnology, National Chung Hsing University, Taichung 402, Taiwan.,Institute of Genomics and Bioinformatics; National Chung Hsing University, Taichung 402, Taiwan
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Discrimination between G/C Binding Sites by Olivomycin A Is Determined by Kinetics of the Drug-DNA Interaction. Int J Mol Sci 2020; 21:ijms21155299. [PMID: 32722584 PMCID: PMC7432603 DOI: 10.3390/ijms21155299] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Revised: 07/20/2020] [Accepted: 07/23/2020] [Indexed: 12/25/2022] Open
Abstract
Olivomycin A (OA) exerts its cytotoxic potency due to binding to the minor groove of the G/C-rich DNA and interfering with replication and transcription. Screening of the complete set of tetranucleotide G/C sites by electrophoretic mobility gel shift assay (EMSA) revealed that the sites containing central GC or GG dinucleotides were able to bind OA, whereas the sites with the central CG dinucleotide were not. However, studies of equilibrium OA binding in solution by fluorescence, circular dichroism and isothermal titration calorimetry failed to confirm the sequence preference of OA, indicating instead a similar type of complex and comparable affinity of OA to all G/C binding sites. This discrepancy was resolved by kinetics analysis of the drug–DNA interaction: the dissociation rate significantly differed between SGCS, SGGS and SCGS sites (S stands for G or C), thereby explaining the disintegration of the complexes during EMSA. The functional relevance of the revealed differential kinetics of OA–DNA interaction was demonstrated in an in vitro transcription assay. These findings emphasize the crucial role of kinetics in the mechanism of OA action and provide an important approach to the screening of new drug candidates.
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Homochirality through Photon-Induced Denaturing of RNA/DNA at the Origin of Life. Life (Basel) 2018; 8:life8020021. [PMID: 29882802 PMCID: PMC6027432 DOI: 10.3390/life8020021] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2018] [Revised: 05/22/2018] [Accepted: 05/22/2018] [Indexed: 12/22/2022] Open
Abstract
Since a racemic mixture of chiral nucleotides frustrates the enzymeless extension of RNA and DNA, the origin of homochirality must be intimately connected with the origin of life. Homochirality theories have elected to presume abiotic mechanisms for prebiotic enantiomer enrichment and post amplification, but none, so far, has been generally accepted. Here I present a novel hypothesis for the procurement of homochirality from an asymmetry in right- over left-circularly polarized photon-induced denaturing of RNA and DNA at the Archean ocean surface as temperatures descended below that of RNA and DNA melting. This asymmetry is attributed to the small excess of right-handed circularly polarized submarine light during the afternoon, when surface water temperatures were highest and thus most conducive to photon-induced denaturing, and to a negative circular dichroism band extending from 230 to 270 nm for small oligos of RNA and DNA. Because D-nucleic acids have greater affinity for L-tryptophan due to stereochemistry, and because D-RNA/DNA+L-tryptophan complexes have an increased negative circular dichroism band between 230 and 270 nm, the homochirality of tryptophan can also be explained by this hypothesis. A numerical model is presented, demonstrating the efficacy of such a mechanism in procuring homochirality of RNA or DNA from an original racemic solution in as little as 270 Archean years.
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Tseng WH, Chang CK, Wu PC, Hu NJ, Lee GH, Tzeng CC, Neidle S, Hou MH. Induced-Fit Recognition of CCG Trinucleotide Repeats by a Nickel-Chromomycin Complex Resulting in Large-Scale DNA Deformation. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201703989] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Wen-Hsuan Tseng
- Institute of Genomics and Bioinformatics; National Chung Hsing University; 250 Kuo-kuang Rd. Taichung Taiwan
| | - Chung-ke Chang
- Institute of Biomedical Sciences; Academia Sinica; 128 Sec. 2, Academia Rd. Nankang Taipei Taiwan
| | - Pei-Ching Wu
- Institute of Genomics and Bioinformatics; National Chung Hsing University; 250 Kuo-kuang Rd. Taichung Taiwan
| | - Nien-Jen Hu
- Institute of Biochemistry; National Chung Hsing University; 250 Kuo-kuang Rd. Taichung Taiwan
| | - Gene-Hsiang Lee
- Instrumentation Center; College of Science; National Taiwan University; No.1, Sec. 4, Roosevelt Rd. Taipei Taiwan
| | - Ching-Cherng Tzeng
- Department of Pathology; Chi Mei Medical Center; No.901, Zhonghua Rd. Tainan Taiwan
| | - Stephen Neidle
- The School of Pharmacy; University College London; London WC1N 1AX UK
| | - Ming-Hon Hou
- Institute of Genomics and Bioinformatics; National Chung Hsing University; 250 Kuo-kuang Rd. Taichung Taiwan
- Institute of Biotechnology; National Chung Hsing University; 250 Kuo-kuang Rd. Taichung Taiwan
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7
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Tseng WH, Chang CK, Wu PC, Hu NJ, Lee GH, Tzeng CC, Neidle S, Hou MH. Induced-Fit Recognition of CCG Trinucleotide Repeats by a Nickel-Chromomycin Complex Resulting in Large-Scale DNA Deformation. Angew Chem Int Ed Engl 2017; 56:8761-8765. [PMID: 28544401 DOI: 10.1002/anie.201703989] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2017] [Indexed: 01/23/2023]
Abstract
Small-molecule compounds targeting trinucleotide repeats in DNA have considerable potential as therapeutic or diagnostic agents against many neurological diseases. NiII (Chro)2 (Chro=chromomycin A3) binds specifically to the minor groove of (CCG)n repeats in duplex DNA, with unique fluorescence features that may serve as a probe for disease detection. Crystallographic studies revealed that the specificity originates from the large-scale spatial rearrangement of the DNA structure, including extrusion of consecutive bases and backbone distortions, with a sharp bending of the duplex accompanied by conformational changes in the NiII chelate itself. The DNA deformation of CCG repeats upon binding forms a GGCC tetranucleotide tract, which is recognized by NiII (Chro)2 . The extruded cytosine and last guanine nucleotides form water-mediated hydrogen bonds, which aid in ligand recognition. The recognition can be accounted for by the classic induced-fit paradigm.
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Affiliation(s)
- Wen-Hsuan Tseng
- Institute of Genomics and Bioinformatics, National Chung Hsing University, 250 Kuo-kuang Rd., Taichung, Taiwan
| | - Chung-Ke Chang
- Institute of Biomedical Sciences, Academia Sinica, 128 Sec. 2, Academia Rd. Nankang, Taipei, Taiwan
| | - Pei-Ching Wu
- Institute of Genomics and Bioinformatics, National Chung Hsing University, 250 Kuo-kuang Rd., Taichung, Taiwan
| | - Nien-Jen Hu
- Institute of Biochemistry, National Chung Hsing University, 250 Kuo-kuang Rd., Taichung, Taiwan
| | - Gene-Hsiang Lee
- Instrumentation Center, College of Science, National Taiwan University, No.1, Sec. 4, Roosevelt Rd., Taipei, Taiwan
| | - Ching-Cherng Tzeng
- Department of Pathology, Chi Mei Medical Center, No.901, Zhonghua Rd., Tainan, Taiwan
| | - Stephen Neidle
- The School of Pharmacy, University College London, London, WC1N 1AX, UK
| | - Ming-Hon Hou
- Institute of Genomics and Bioinformatics, National Chung Hsing University, 250 Kuo-kuang Rd., Taichung, Taiwan
- Institute of Biotechnology, National Chung Hsing University, 250 Kuo-kuang Rd., Taichung, Taiwan
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Guimarães LA, Jimenez PC, Sousa TDS, Freitas HPS, Rocha DD, Wilke DV, Martín J, Reyes F, Deusdênia Loiola Pessoa O, Costa-Lotufo LV. Chromomycin A2 induces autophagy in melanoma cells. Mar Drugs 2014; 12:5839-55. [PMID: 25486109 PMCID: PMC4278204 DOI: 10.3390/md12125839] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2014] [Revised: 11/17/2014] [Accepted: 11/20/2014] [Indexed: 12/19/2022] Open
Abstract
The present study highlights the biological effects of chromomycin A2 toward metastatic melanoma cells in culture. Besides chromomycin A2, chromomycin A3 and demethylchromomycin A2 were also identified from the extract derived from Streptomyces sp., recovered from Paracuru Beach, located in the northeast region of Brazil. The cytotoxic activity of chromomycin A2 was evaluated across a panel of human tumor cell lines, which found IC50 values in the nM-range for exposures of 48 and 72 h. MALME-3M, a metastatic melanoma cell line, showed the highest sensitivity to chromomycin A2 after 48h incubation, and was chosen as a model to investigate this potent cytotoxic effect. Treatment with chromomycin A2 at 30 nM reduced cell proliferation, but had no significant effect upon cell viability. Additionally, chromomycin A2 induced accumulation of cells in G0/G1 phase of the cell cycle, with consequent reduction of S and G2/M and unbalanced expression of cyclins. Chromomycin A2 treated cells depicted several cellular fragments resembling autophagosomes and increased expression of proteins LC3-A and LC3-B. Moreover, exposure to chromomycin A2 also induced the appearance of acidic vacuolar organelles in treated cells. These features combined are suggestive of the induction of autophagy promoted by chromomycin A2, a feature not previously described for chromomycins.
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Affiliation(s)
| | | | - Thiciana da Silva Sousa
- Department of Organic and Inorganic Chemistry, Federal University of Ceara, Fortaleza, CE 60021-970, Brazil.
| | - Hozana Patrícia S Freitas
- Department of Organic and Inorganic Chemistry, Federal University of Ceara, Fortaleza, CE 60021-970, Brazil.
| | - Danilo Damasceno Rocha
- Department of Physiology and Pharmacology, Federal University of Ceara, Fortaleza, Ceará 60430-270, Brazil.
| | - Diego Veras Wilke
- Marine Sciences Institute, Federal University of Ceara, Fortaleza, Ceara 60165-081, Brazil.
| | - Jesús Martín
- Fundación MEDINA, Centro de Excelencia en Investigación de Medicamentos Innovadores en Andalucía, Granada 18016, Spain.
| | - Fernando Reyes
- Fundación MEDINA, Centro de Excelencia en Investigación de Medicamentos Innovadores en Andalucía, Granada 18016, Spain.
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Dezhenkova LG, Tsvetkov VB, Shtil AA. Topoisomerase I and II inhibitors: chemical structure, mechanisms of action and role in cancer chemotherapy. RUSSIAN CHEMICAL REVIEWS 2014. [DOI: 10.1070/rc2014v083n01abeh004363] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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10
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The binding of the Co(II) complex of dimeric chromomycin A3 to GC sites with flanking G:G mismatches. J Inorg Biochem 2012; 121:28-36. [PMID: 23333714 DOI: 10.1016/j.jinorgbio.2012.12.007] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2012] [Revised: 12/12/2012] [Accepted: 12/12/2012] [Indexed: 01/09/2023]
Abstract
Some neurological diseases are correlated with expansion of (CXG)n trinucleotide repeats, which contain many contiguous GpC flanked by mismatched X/X base pair. This study focused on the binding of the Co(II) complex of dimeric chromomycin A3(Chro), Co(II)(Chro)2, to DNA with CXG trinucleotide repeats. The present study showed that GC sites with flanking G:G mismatches provide an excellent binding site for Co(II)(Chro)2 as shown by surface plasmon resonance and fluorescence analysis, compared to GC sites with flanking A:A, T:T, or C:C mismatches. In addition, we measured the ability of Co(II)(Chro)2 to act on the hairpin DNA of (CGG)16. We observed that Co(II)(Chro)2 could stabilize and trap the cruciform conformation of (CGG)16. Furthermore, two Co(II)(Chro)2 molecules may bind at the two GpC sites separated by at least one GC site in the hairpin structure of (CGG)16. In a synthetic self-priming DNA model, 5'-(CGG)16(CCG)6-3', Co(II)(Chro)2 can interfere with the expansion process of CGG triplet repeats, as shown by a gel electrophoretic expansion assay. Here, we first report the acting of Co(II)(Chro)2, the groove-binding drug, to trinucleotide repeats. Our results provide the possible biological consequence of Co(II)(Chro)2 bound to CGG triplet repeat sequences.
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Wang SY, Lee YL, Lai YH, Chen JJW, Wu WL, Yuann JMP, Su WL, Chuang SM, Hou MH. Spermine attenuates the action of the DNA intercalator, actinomycin D, on DNA binding and the inhibition of transcription and DNA replication. PLoS One 2012; 7:e47101. [PMID: 23144800 PMCID: PMC3493566 DOI: 10.1371/journal.pone.0047101] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2012] [Accepted: 09/10/2012] [Indexed: 12/23/2022] Open
Abstract
The anticancer activity of DNA intercalators is related to their ability to intercalate into the DNA duplex with high affinity, thereby interfering with DNA replication and transcription. Polyamines (spermine in particular) are almost exclusively bound to nucleic acids and are involved in many cellular processes that require nucleic acids. Until now, the effects of polyamines on DNA intercalator activities have remained unclear because intercalation is the most important mechanism employed by DNA-binding drugs. Herein, using actinomycin D (ACTD) as a model, we have attempted to elucidate the effects of spermine on the action of ACTD, including its DNA-binding ability, RNA and DNA polymerase interference, and its role in the transcription and replication inhibition of ACTD within cells. We found that spermine interfered with the binding and stabilization of ACTD to DNA. The presence of increasing concentrations of spermine enhanced the transcriptional and replication activities of RNA and DNA polymerases, respectively, in vitro treated with ActD. Moreover, a decrease in intracellular polyamine concentrations stimulated by methylglyoxal-bis(guanylhydrazone) (MGBG) enhanced the ACTD-induced inhibition of c-myc transcription and DNA replication in several cancer cell lines. The results indicated that spermine attenuates ACTD binding to DNA and its inhibition of transcription and DNA replication both in vitro and within cells. Finally, a synergistic antiproliferative effect of MGBG and ACTD was observed in a cell viability assay. Our findings will be of significant relevance to future developments in combination with cancer therapy by enhancing the anticancer activity of DNA interactors through polyamine depletion.
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Affiliation(s)
- Sheng-Yu Wang
- Department of Life Science, National Chung Hsing University, Taichung, Taiwan
- Institute of Genomics and Bioinformatics, National Chung Hsing University, Taichung, Taiwan
| | - Yueh-Luen Lee
- National Institute of Cancer Research, National Health Research Institutes, Miaoli, Taiwan
| | - Yi-Hua Lai
- Institute of Biomedical Sciences, National Chung Hsing University, Taichung, Taiwan
| | - Jeremy J. W. Chen
- Institute of Biomedical Sciences, National Chung Hsing University, Taichung, Taiwan
| | - Wen-Lin Wu
- Institute of Genomics and Bioinformatics, National Chung Hsing University, Taichung, Taiwan
| | - Jeu-Ming P. Yuann
- Department of Biotechnology, Ming Chuan University, Taoyuan County, Taiwan
| | - Wang-Lin Su
- Department of Life Science, National Chung Hsing University, Taichung, Taiwan
| | - Show-Mei Chuang
- Institute of Biomedical Sciences, National Chung Hsing University, Taichung, Taiwan
| | - Ming-Hon Hou
- Department of Life Science, National Chung Hsing University, Taichung, Taiwan
- Institute of Genomics and Bioinformatics, National Chung Hsing University, Taichung, Taiwan
- * E-mail:
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Hsu CW, Kuo CF, Chuang SM, Hou MH. Elucidation of the DNA-interacting properties and anticancer activity of a Ni(II)-coordinated mithramycin dimer complex. Biometals 2012; 26:1-12. [DOI: 10.1007/s10534-012-9589-8] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2012] [Accepted: 10/03/2012] [Indexed: 02/03/2023]
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13
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Chang YM, Chen CKM, Chang YC, Jeng WY, Hou MH, Wang AHJ. Functional studies of ssDNA binding ability of MarR family protein TcaR from Staphylococcus epidermidis. PLoS One 2012; 7:e45665. [PMID: 23029170 PMCID: PMC3448645 DOI: 10.1371/journal.pone.0045665] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2012] [Accepted: 08/20/2012] [Indexed: 01/21/2023] Open
Abstract
The negative transcription regulator of the ica locus, TcaR, regulates proteins involved in the biosynthesis of poly-N-acetylglucosamine (PNAG). Absence of TcaR increases PNAG production and promotes biofilm formation in Staphylococci. Previously, the 3D structure of TcaR in its apo form and its complex structure with several antibiotics have been analyzed. However, the detailed mechanism of multiple antibiotic resistance regulator (MarR) family proteins such as TcaR is unclear and only restricted on the binding ability of double-strand DNA (dsDNA). Here we show by electrophoretic mobility shift assay (EMSA), electron microscopy (EM), circular dichroism (CD), and Biacore analysis that TcaR can interact strongly with single-stranded DNA (ssDNA), thereby identifying a new role in MarR family proteins. Moreover, we show that TcaR preferentially binds 33-mer ssDNA over double-stranded DNA and inhibits viral ssDNA replication. In contrast, such ssDNA binding properties were not observed for other MarR family protein and TetR family protein, suggesting that the results from our studies are not an artifact due to simple charge interactions between TcaR and ssDNA. Overall, these results suggest a novel role for TcaR in regulation of DNA replication. We anticipate that the results of this work will extend our understanding of MarR family protein and broaden the development of new therapeutic strategies for Staphylococci.
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Affiliation(s)
- Yu-Ming Chang
- Institute of Biological Chemistry, Academia Sinica, Taipei, Taiwan
| | | | - Yuan-Chih Chang
- Institute of Cellular and Organismic Biology, Academia Sinica, Taipei, Taiwan
| | - Wen-Yih Jeng
- Institute of Biological Chemistry, Academia Sinica, Taipei, Taiwan
- Core Facilities for Protein Structural Analysis, Academia Sinica, Taipei, Taiwan
- University Center for Bioscience and Biotechnology, National Cheng Kung University, Tainan, Taiwan
| | - Ming-Hon Hou
- Biotechnology Center, National Chung Hsing University, Taichung, Taiwan
- Institute of Genomics and Bioinformatics, National Chung Hsing University, Taichung, Taiwan
- Department of Life Science, National Chung Hsing University, Taichung, Taiwan
| | - Andrew H. -J. Wang
- Institute of Biological Chemistry, Academia Sinica, Taipei, Taiwan
- Core Facilities for Protein Structural Analysis, Academia Sinica, Taipei, Taiwan
- * E-mail:
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14
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Hsu CW, Chuang SM, Wu WL, Hou MH. The crucial role of divalent metal ions in the DNA-acting efficacy and inhibition of the transcription of dimeric chromomycin A3. PLoS One 2012; 7:e43792. [PMID: 22984445 PMCID: PMC3440418 DOI: 10.1371/journal.pone.0043792] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2012] [Accepted: 07/24/2012] [Indexed: 12/11/2022] Open
Abstract
Chromomycin A3 (Chro) is capable of forming a stable dimeric complex via chelation with Ni(II), Fe(II) and Co(II). According to the circular dichroism study, the dimer conformations are significantly different among the Fe(II)-, Co(II)-, and Ni(II)-containing dimeric Chro complexes; however, the dimer conformations were preserved at high temperatures. Furthermore, we conducted a systematic study to determine the effects of these divalent metal ions on the DNA-acting efficacy of dimeric Chro, including its DNA-binding affinity, DNA stabilization capacity, DNA cleavage activity, and the inhibition of transcription both in vitro and within cells. Kinetic analyses using surface plasmon resonance (SPR) showed that NiII(Chro)2 exhibited the highest Ka with a value of 1.26×107 M−1, which is approximately 1.6- and 3.7-fold higher than the Ka values obtained for CoII(Chro)2 and FeII(Chro)2, respectively. The Tm and ΔG values for the DNA duplex increased after the addition of drug complexes in the following order: NiII(Chro)2>CoII(Chro)2>FeII(Chro)2. In the DNA integrity assays, the DNA cleavage rate of CoII(Chro)2 (1.2×10−3 s−1) is higher than those of FeII(Chro)2 and NiII(Chro)2, which were calculated to be 1×10−4 and 3.1×10−4 s−1, respectively. Consistent with the SPR and UV melting results, NiII(Chro)2 possesses the highest inhibitory effect on in vitro transcription and c-myc transcription within cells compared to CoII(Chro)2 and FeII(Chro)2. By comparing the cytotoxicity among CoII(Chro)2, FeII(Chro)2, and NiII(Chro)2 to several cancer cell lines, our studies concluded that NiII(Chro)2 displayed more potential antitumor activities than CoII(Chro)2 and FeII(Chro)2 did due to its higher DNA-acting efficacy. Changes to the divalent metal ions in the dimeric Chro complexes have been correlated with improved anticancer profiles. The availability of new metal derivatives of Chro may introduce new possibilities for exploiting the unique properties of this class of compounds for therapeutic applications.
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Affiliation(s)
- Chun-Wei Hsu
- Institute of Genomics and Bioinformatics, National Chung Hsing University, Taichung, Taiwan
| | - Show-Mei Chuang
- Institute of Biomedical Sciences, National Chung Hsing University, Taichung, Taiwan
| | - Wen-Ling Wu
- Institute of Genomics and Bioinformatics, National Chung Hsing University, Taichung, Taiwan
- Biotechnology Center, National Chung Hsing University, Taichung, Taiwan
| | - Ming-Hon Hou
- Institute of Genomics and Bioinformatics, National Chung Hsing University, Taichung, Taiwan
- Biotechnology Center, National Chung Hsing University, Taichung, Taiwan
- Department of Life Science, National Chung Hsing University, Taichung, Taiwan
- * E-mail:
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15
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Synthesis, characterization, biological studies (DNA binding, cleavage, antibacterial and topoisomerase I) and molecular docking of copper(II) benzimidazole complexes. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2012; 114:15-26. [DOI: 10.1016/j.jphotobiol.2012.05.003] [Citation(s) in RCA: 115] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2012] [Revised: 04/24/2012] [Accepted: 05/03/2012] [Indexed: 11/19/2022]
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16
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Chang YM, Chen CKM, Hou MH. Conformational changes in DNA upon ligand binding monitored by circular dichroism. Int J Mol Sci 2012; 13:3394-3413. [PMID: 22489158 PMCID: PMC3317384 DOI: 10.3390/ijms13033394] [Citation(s) in RCA: 134] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2012] [Revised: 02/22/2012] [Accepted: 02/24/2012] [Indexed: 11/16/2022] Open
Abstract
Circular dichroism (CD) spectroscopy is an optical technique that measures the difference in the absorption of left and right circularly polarized light. This technique has been widely employed in the studies of nucleic acids structures and the use of it to monitor conformational polymorphism of DNA has grown tremendously in the past few decades. DNA may undergo conformational changes to B-form, A-form, Z-form, quadruplexes, triplexes and other structures as a result of the binding process to different compounds. Here we review the recent CD spectroscopic studies of the induction of DNA conformational changes by different ligands, which includes metal derivative complex of aureolic family drugs, actinomycin D, neomycin, cisplatin, and polyamine. It is clear that CD spectroscopy is extremely sensitive and relatively inexpensive, as compared with other techniques. These studies show that CD spectroscopy is a powerful technique to monitor DNA conformational changes resulting from drug binding and also shows its potential to be a drug-screening platform in the future.
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Affiliation(s)
- Yu-Ming Chang
- Institute of Biological Chemistry, Academia Sinica, Taipei 115, Taiwan; E-Mails: (Y.-M.C.); (C.K.-M.C.)
| | - Cammy K.-M. Chen
- Institute of Biological Chemistry, Academia Sinica, Taipei 115, Taiwan; E-Mails: (Y.-M.C.); (C.K.-M.C.)
| | - Ming-Hon Hou
- Institute of Genomics and Bioinformatics, National Chung Hsing University, Taichung 402, Taiwan
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17
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Westbrook AM, Wei B, Hacke K, Xia M, Braun J, Schiestl RH. The role of tumour necrosis factor-α and tumour necrosis factor receptor signalling in inflammation-associated systemic genotoxicity. Mutagenesis 2011; 27:77-86. [PMID: 21980144 DOI: 10.1093/mutage/ger063] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
Chronic inflammatory diseases are characterised by systemically elevated levels of tumour necrosis factor (TNF)-α, a proinflammatory cytokine with pleiotropic downstream effects. We have previously demonstrated increased genotoxicity in peripheral leukocytes and various tissues in models of intestinal inflammation. In the present study, we asked whether TNF-α is sufficient to induce DNA damage systemically, as observed in intestinal inflammation, and whether tumour necrosis factor receptor (TNFR) signalling would be necessary for the resultant genotoxicity. In the wild-type mice, 500 ng per mouse of TNF-α was sufficient to induce DNA damage to multiple cell types and organs 1-h post-administration. Primary splenic T cells manifested TNF-α-induced DNA damage in the absence of other cell types. Furthermore, TNFR1(-/-)TNFR2(-/-) mice demonstrated decreased systemic DNA damage in a model of intestinal inflammation and after TNF-α injection versus wild-type mice, indicating the necessity of TNFR signalling. Nuclear factor (NF)-κB inhibitors were also able to decrease damage induced by TNF-α injection in wild-type mice. When TNF-α administration was combined with interleukin (IL)-1β, another proinflammatory cytokine, DNA damage persisted for up to 24 h. When combined with IL-10, an anti-inflammatory cytokine, decreased genotoxicity was observed in vivo and in vitro. TNF-α/TNFR-mediated signalling is therefore sufficient and plays a large role in mediating DNA damage to various cell types, subject to modulation by other cytokines and their mediators.
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Affiliation(s)
- Aya M Westbrook
- Department of Pathology and Laboratory Medicine, School of Medicine, University of California, Los Angeles, 650 Charles E. Young Drive South, Los Angeles, CA 90095, USA
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Bosserman MA, Flórez AB, Shaaban KA, Braña AF, Salas JA, Méndez C, Rohr J. Characterization of the terminal activation step catalyzed by oxygenase CmmOIV of the chromomycin biosynthetic pathway from Streptomyces griseus. Biochemistry 2011; 50:1421-8. [PMID: 21244022 DOI: 10.1021/bi1016205] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Inactivation and initial interrogation of key oxygenase CmmOIV of the biosynthetic pathway of chromomycin A(3) in Streptomyces griseus ssp. griseus revealed that a completely methylated and acetylated prechromomycin is the preferred substrate of this enzyme. This suggests that the three sugar decoration reactions, two O-acetylations and an O-methylation, which were previously believed to occur as the final steps of chromomycin A(3) biosynthesis, indeed take place prior to the CmmOIV reaction. Upon inactivation of CmmOIV, four new compounds accumulated; the fully decorated prechromomycin and its incompletely acetylated precursor along with a diketoprechromomycin-type compound were fully characterized and assayed with CmmOIV.
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Affiliation(s)
- Mary A Bosserman
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky, 789 South Limestone Street, Lexington, KY 40536-0596, USA
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Wang P, Leung CH, Ma DL, Lu W, Che CM. Organoplatinum(II) complexes with nucleobase motifs as inhibitors of human topoisomerase II catalytic activity. Chem Asian J 2011; 5:2271-80. [PMID: 20730852 DOI: 10.1002/asia.201000451] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Platinum(II) complexes bearing acetylide ligands containing nucleobase motifs are prepared and their impact on human topoisomerase II (TopoII) is evaluated. Both platinum(II) complexes [Pt(II)(C^N^N)(C≡CCH₂R)] (1a-c) and [Pt(II)(tBu₃terpy)(C≡CCH₂R)](+) (2a-c) (C^N^N=6-phenyl-2,2'-bipyridyl, tBu₃terpy=4,4',4''-tri-tert-butyl-2,2':6',2''-terpyridyl, and R=(a) adenine, (b) thymine, and (c) 2-amino-6-chloropurine) are stable in aqueous solutions for 48 hours at room temperature. The binding constants (K) for the platinum(II) complexes towards calf thymus DNA are in the order of 10⁵ dm³ mol⁻¹ as estimated by using UV/Vis absorption spectroscopy. Of the complexes examined, only complexes 1a-c are found to behave as intercalators. Both complexes 1a-c and 2a-c inhibit TopoII-induced relaxation of supercoiled DNA, while 2c is the most potent TopoII inhibitors among the tested compounds. Inhibition of DNA relaxation is detected at nanomolar concentrations of 2c. All of the platinum(II) complexes are cytotoxic to human cancer cells with IC₅₀ values of 0.5-13.7 μM, while they are less toxic against normal cells CCD-19 Lu.
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Affiliation(s)
- Ping Wang
- Department of Chemistry and Open Laboratory of Chemical Biology of the Institute of Molecular Technology for Drug Discovery and Synthesis, The University of Hong Kong, Pokfulam Road, Hong Kong, P.R. China
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Tsai HP, Lin LW, Lai ZY, Wu JY, Chen CE, Hwang J, Chen CS, Lin CM. Immobilizing topoisomerase I on a surface plasmon resonance biosensor chip to screen for inhibitors. J Biomed Sci 2010; 17:49. [PMID: 20565729 PMCID: PMC2898767 DOI: 10.1186/1423-0127-17-49] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2010] [Accepted: 06/17/2010] [Indexed: 01/13/2023] Open
Abstract
BACKGROUND The topoisomerase I (TopI) reaction intermediate consists of an enzyme covalently linked to a nicked DNA molecule, known as a TopI-DNA complex, that can be trapped by inhibitors and results in failure of re-ligation. Attempts at new derivative designs for TopI inhibition are enthusiastically being pursued, and TopI inhibitors were developed for a variety of applications. Surface plasmon resonance (SPR) was recently used in TopI-inhibition studies. However, most such immobilized small molecules or short-sequence nucleotides are used as ligands onto sensor chips, and TopI was used as the analyte that flowed through the sensor chip. METHODS We established a sensor chip on which the TopI protein is immobilized to evaluate TopI inhibition by SPR. Camptothecin (CPT) targeting the DNA-TopI complex was used as a representative inhibitor to validate this label-free method. RESULTS Purified recombinant human TopI was covalently coupled to the sensor chip for the SPR assay. The binding of anti-human (h)TopI antibodies and plasmid pUC19, respectively, to the immobilized hTopI was observed with dose-dependent increases in resonance units (RU) suggesting that the immobilized hTopI retains its DNA-binding activity. Neither CPT nor evodiamine alone in the analyte flowing through the sensor chip showed a significant increase in RU. The combination of pUC19 and TopI inhibitors as the analyte flowing through the sensor chip caused increases in RU. This confirms its reliability for binding kinetic studies of DNA-TopI binders for interaction and for primary screening of TopI inhibitors. CONCLUSIONS TopI immobilized on the chip retained its bioactivities of DNA binding and catalysis of intermediates of the DNA-TopI complex. This provides DNA-TopI binders for interaction and primary screening with a label-free method. In addition, this biochip can also ensure the reliability of binding kinetic studies of TopI.
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Affiliation(s)
- Hsiang-Ping Tsai
- Department of Biochemistry, School of Medicine, Taipei Medical University, Taipei, Taiwan
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21
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Rich RL, Myszka DG. Grading the commercial optical biosensor literature-Class of 2008: 'The Mighty Binders'. J Mol Recognit 2010; 23:1-64. [PMID: 20017116 DOI: 10.1002/jmr.1004] [Citation(s) in RCA: 109] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Optical biosensor technology continues to be the method of choice for label-free, real-time interaction analysis. But when it comes to improving the quality of the biosensor literature, education should be fundamental. Of the 1413 articles published in 2008, less than 30% would pass the requirements for high-school chemistry. To teach by example, we spotlight 10 papers that illustrate how to implement the technology properly. Then we grade every paper published in 2008 on a scale from A to F and outline what features make a biosensor article fabulous, middling or abysmal. To help improve the quality of published data, we focus on a few experimental, analysis and presentation mistakes that are alarmingly common. With the literature as a guide, we want to ensure that no user is left behind.
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Affiliation(s)
- Rebecca L Rich
- Center for Biomolecular Interaction Analysis, University of Utah, Salt Lake City, UT 84132, USA
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The impact of spermine competition on the efficacy of DNA-binding Fe(II), Co(II), and Cu(II) complexes of dimeric chromomycin A(3). J Inorg Biochem 2009; 103:1626-33. [PMID: 19800127 DOI: 10.1016/j.jinorgbio.2009.09.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2009] [Revised: 09/01/2009] [Accepted: 09/02/2009] [Indexed: 11/21/2022]
Abstract
Chromomycin (Chro) forms a 2:1 drug/metal complex through the chelation with Fe(II), Co(II), or Cu(II) ion. The effects of spermine on the interaction of Fe(II), Co(II), and Cu(II) complexes of dimeric Chro with DNA were studied. Circular dichroism (CD) measurements revealed that spermine strongly competed for the Fe(II) and Cu(II) cations in dimeric Chro-DNA complexes, and disrupted the structures of these complexes. However, the DNA-Co(II)(Chro)(2) complex showed extreme resistance to spermine-mediated competition for the Co(II) cation. According to surface plasmon resonance (SPR) experiments, a 6mM concentration of spermine completely abolished the DNA-binding activity of Fe(II)(Chro)(2) and Cu(II)(Chro)(2) and interfered with the associative binding of Co(II)(Chro)(2) complexes to DNA duplexes, but only slightly affected dissociation. In DNA integrity assays, lower concentrations of spermine (1 and 2mM) promoted DNA strand cleavage by Cu(II)(Chro)(2), whereas various concentrations of spermine protected plasmid DNA from damage caused by either Co(II)(Chro)(2) or Fe(II)(Chro)(2). Additionally, DNA condensation was observed in the reactions of DNA, spermine, and Fe(II)(Chro)(2). Despite the fact that Cu(II)(Chro)(2) and Fe(II)(Chro)(2) demonstrated lower DNA-binding activity than Co(II)(Chro)(2) in the absence of spermine, while Cu(II)(Chro)(2) and Fe(II)(Chro)(2) exhibited greater cytoxicity against HepG2 cells than Co(II)(Chro)(2), possibly due to competition of spermine for Fe(II) or Cu(II) in the dimeric Chro complex in the nucleus of the cancer cells. Our results should have significant relevance to future developments in metalloantibiotics for cancer therapy.
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Hou MH, Lu WJ, Huang CY, Fan RJ, Yuann JMP. Effects of polyamines on the DNA-reactive properties of dimeric mithramycin complexed with cobalt(II): implications for anticancer therapy. Biochemistry 2009; 48:4691-8. [PMID: 19368394 DOI: 10.1021/bi900092w] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Few studies have examined the effects of polyamines on the action of DNA-binding anticancer drugs. Here, a Co(II)-mediated dimeric mithramycin (Mith) complex, (Mith)(2)-Co(II), was shown to be resistant to polyamine competition toward the divalent metal ion when compared to the Fe(II)-mediated drug complexes. Surface plasmon resonance experiments demonstrated that polyamines interfered with the binding capacity and association rates of (Mith)(2)-Co(II) binding to DNA duplexes, while the dissociation rates were not affected. Although (Mith)(2)-Co(II) exhibited the highest oxidative activity under physiological conditions (pH 7.3 and 37 degrees C), polyamines (spermine in particular) inhibited the DNA cleavage activity of the (Mith)(2)-Co(II) in a concentration-dependent manner. Depletion of intracellular polyamines by methylglyoxal bis(guanylhydrazone) (MGBG) enhanced the sensitivity of A549 lung cancer cells to (Mith)(2)-Co(II), most likely due to the decreased intracellular effect of polyamines on the action of (Mith)(2)-Co(II). Our study suggests a novel method for enhancing the anticancer activity of DNA-binding metalloantibiotics through polyamine depletion.
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Affiliation(s)
- Ming-Hon Hou
- Biotechnology Center, National Chung Hsing University, Taichung, 402 Taiwan.
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Tevyashova AN, Olsufyeva EN, Turchin KF, Balzarini J, Bykov EE, Dezhenkova LG, Shtil AA, Preobrazhenskaya MN. Reaction of the antitumor antibiotic olivomycin I with aryl diazonium salts. Synthesis, cytotoxic and antiretroviral potency of 5-aryldiazenyl-6-O-deglycosyl derivatives of olivomycin I. Bioorg Med Chem 2009; 17:4961-7. [PMID: 19535252 DOI: 10.1016/j.bmc.2009.05.076] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2009] [Revised: 05/25/2009] [Accepted: 05/31/2009] [Indexed: 10/20/2022]
Abstract
The azo coupling of the antibiotic olivomycin I (1) with aryl diazonium tetrafluoroborates produced 5-aryldiazenyl-6-O-deglycosyl derivatives of 1. The structures of new compounds were confirmed by (1)H NMR and mass spectrometry analysis. A quantum-chemical study was performed to analyze the possible directions of electrophilic substitution of 1 and the easiness of 6-O-disaccharide hydrolysis in the course of azo coupling. The antiproliferative and anti-retroviral activities of novel derivatives were studied.
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Affiliation(s)
- Anna N Tevyashova
- Gause Institute of New Antibiotics, Russian Academy of Medical Sciences, 11 B. Pirogovskaya, Moscow 119021, Russian Federation
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Olano C, Méndez C, Salas JA. Antitumor compounds from actinomycetes: from gene clusters to new derivatives by combinatorial biosynthesis. Nat Prod Rep 2009; 26:628-60. [PMID: 19387499 DOI: 10.1039/b822528a] [Citation(s) in RCA: 98] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Covering: up to October 2008. Antitumor compounds produced by actinomycetes and novel derivatives generated by combinatorial biosynthesis are reviewed (with 318 references cited.) The different structural groups for which the relevant gene clusters have been isolated and characterized are reviewed, with a description of the strategies used for the generation of the novel derivatives and the activities of these compounds against tumor cell lines.
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Affiliation(s)
- Carlos Olano
- Departamento de Biología Funcional and Instituto Universitario de Oncología del Principado de Asturias (I.U.O.P.A.), Universidad de Oviedo, 33006, Oviedo, Spain
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Modification of the antibiotic olivomycin I at the 2'-keto group of the side chain. Novel derivatives, antitumor and topoisomerase I-poisoning activity. J Antibiot (Tokyo) 2009; 62:37-41. [PMID: 19132061 DOI: 10.1038/ja.2008.7] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
A novel way of chemical modification of the antibiotic olivomycin I at the 2'-keto group of the side chain of the aglycone moiety was developed. Reaction of olivomycin I with the carboxymethoxylamine hemihydrochloride gave the key intermediate, 2'-carboxymethoxime-olivomycin I, which was further reacted with different amines in the presence of benzotriazol-1-yl-oxy-trispyrrolidinophosphonium hexafluorophosphate to give the corresponding amides. The antiproliferative and topoisomerase I (Topo-I)-poisoning activities of the novel derivatives were examined. One of the novel derivatives showed a marked inhibitory activity against Topo-I, a pronounced antitumor activity in in vivo experiments on mice bearing leukemia P-388 and lower toxic side effects compared with the parent olivomycin I.
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