1
|
Al-Karmalawy AA, Mousa MHA, Sharaky M, Mourad MAE, El-Dessouki AM, Hamouda AO, Alnajjar R, Ayed AA, Shaldam MA, Tawfik HO. Lead Optimization of BIBR1591 To Improve Its Telomerase Inhibitory Activity: Design and Synthesis of Novel Four Chemical Series with In Silico, In Vitro, and In Vivo Preclinical Assessments. J Med Chem 2024; 67:492-512. [PMID: 38117230 DOI: 10.1021/acs.jmedchem.3c01708] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2023]
Abstract
Herein, modifications to the previously reported BIBR1591 were conducted to obtain bioisosteric candidates with improved activities. The % inhibition of the newly afforded candidates against the telomerase target was investigated. Notably, 6f achieved superior telomerase inhibition (63.14%) compared to BIBR1532 and BIBR1591 (69.64 and 51.58%, respectively). In addition, 8a and 8b showed comparable promising telomerase inhibition with 58.65 and 55.57%, respectively, which were recorded to be frontier to that of BIBR1591. 6f, 8a, and 8b were tested against five cancer cell lines related to the lung and liver subtypes. Moreover, 6f was examined on both cell cycle progression and apoptosis induction in HuH7 cancer cells. Furthermore, the in vivo antitumor activity of 6f was further assessed in female mice with solid Ehrlich carcinoma. In addition, molecular docking and molecular dynamics simulations were carried out. Collectively, 6f, 8a, and 8b could be considered potential new telomerase inhibitors to be subjected to further investigation and/or optimization.
Collapse
Affiliation(s)
- Ahmed A Al-Karmalawy
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Horus University-Egypt, New Damietta 34518, Egypt
- Pharmaceutical Chemistry Department, Faculty of Pharmacy, Ahram Canadian University, 6h of October City, Giza 12566, Egypt
| | - Mai H A Mousa
- Pharmaceutical Chemistry Department, Faculty of Pharmacy and Drug Technology, Egyptian Chinese University, Cairo 11786, Egypt
| | - Marwa Sharaky
- Cancer Biology Department, Pharmacology Unit, National Cancer Institute (NCI), Cairo University, Cairo 12613, Egypt
| | - Mai A E Mourad
- Medicinal Chemistry Department, Faculty of Pharmacy, Port-Said University, Port-Said 42511, Egypt
| | - Ahmed M El-Dessouki
- Pharmacology and Toxicology Department, Faculty of Pharmacy, Ahram Canadian University, 6th of October City, Giza 12566, Egypt
| | - Amir O Hamouda
- Department of Biochemistry, Faculty of Pharmacy, Horus University-Egypt, New Damietta 34518, Egypt
| | - Radwan Alnajjar
- Department of Chemistry, Faculty of Science, University of Benghazi, Benghazi 1308, Libya
- PharmD, Faculty of Pharmacy, Libyan International Medical University, Benghazi 1308, Libya
| | - Abdelmoneim A Ayed
- Department of Chemistry, Faculty of Science, Tanta University, Tanta 31527, Egypt
| | - Moataz A Shaldam
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Kafrelsheikh University, Kafrelsheikh 33516, Egypt
| | - Haytham O Tawfik
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Tanta University, Tanta 31527, Egypt
| |
Collapse
|
2
|
Jawarkar RD, Bakal RL, Khatale PN, Lewaa I, Jain CM, Manwar JV, Jaiswal MS. QSAR, pharmacophore modeling and molecular docking studies to identify structural alerts for some nitrogen heterocycles as dual inhibitor of telomerase reverse transcriptase and human telomeric G-quadruplex DNA. FUTURE JOURNAL OF PHARMACEUTICAL SCIENCES 2021. [DOI: 10.1186/s43094-021-00380-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Abstract
Background
Telomerase reverse transcriptase (TERT) and human telomeric G-quadruplex DNA are amongst the favorable target for researchers to discover novel and more effective anticancer agents. To understand and elucidate structure activity relationship and mechanism of inhibition of telomerase reverse transcriptase (TERT) and human telomeric G-quadruplex DNA, a QSAR modeling and molecular docking were conducted.
Results
Two robust QSAR model were obtained which consist of full set QSAR model (R2: 0.8174, CCCtr: 0.8995, Q2loo: 0.7881, Q2LMO: 0.7814) and divided set QSAR model (R2: 0.8217, CCCtr: 0.9021, Q2loo: 0.7886, Q2LMO: 0.7783, Q2-F1: 0.7078, Q2-F2: 0.6865, Q2-F3: 0.7346) for envisaging the inhibitory activity of telomerase reverse transcriptase (TERT) and human telomeric G-quadruplex DNA. The analysis reveals that carbon atom exactly at 3 bonds from aromatic carbon atom, nitrogen atom exactly at six bonds from planer nitrogen atom, aromatic carbon atom within 2 A0 from the center of mass of molecule and occurrence of element hydrogen within 2 A0 from donar atom are the key pharmacophoric features important for dual inhibition of TERT and human telomeric G-quadruplex DNA. To validate this analysis, pharmacophore modeling and the molecular docking is performed. Molecular docking analysis support QSAR analysis and revealed that, dual inhibition of TERT and human telomeric DNA is mainly contributed from hydrophobic and hydrogen bonding interactions.
Conclusion
The findings of molecular docking, pharmacophore modelling, and QSAR are all consistent and in strong agreement. The validated QSAR analyses can detect structural alerts, pharmacophore modelling can classify a molecule's consensus pharmacophore involving hydrophobic and acceptor regions, whereas docking analysis can reveal the mechanism of dual inhibition of telomerase reverse transcriptase (TERT) and human telomeric G-quadruplex DNA. The combination of QSAR, pharmacophore modeling and molecular docking may be useful for the future drug design of dual inhibitors to combat the devastating issue of resistance.
Graphical abstract
Collapse
|
3
|
Ali S, Lombardi EP, Ghosh D, Jia T, Vitry G, Saker L, Poupon J, Teulade-Fichou MP, Nicolas A, Londono-Vallejo A, Bombard S. Pt-ttpy, a G-quadruplex binding platinum complex, induces telomere dysfunction and G-rich regions DNA damage. Metallomics 2021; 13:6280987. [PMID: 34021581 DOI: 10.1093/mtomcs/mfab029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2021] [Revised: 05/11/2021] [Accepted: 05/13/2021] [Indexed: 11/14/2022]
Abstract
Pt-ttpy (tolyl terpyridin-Pt complex) covalently binds to G-quadruplex (G4) structures in vitro and to telomeres in cellulo via its Pt moiety. Here, we identified its targets in the human genome, in comparison to Pt-tpy, its derivative without G4 affinity, and cisplatin. Pt-ttpy, but not Pt-tpy, induces the release of the shelterin protein TRF2 from telomeres concomitantly to the formation of DNA damage foci at telomeres but also at other chromosomal locations. γ-H2AX chromatin immunoprecipitation (ChIP-seq) after treatment with Pt-ttpy or cisplatin revealed accumulation in G- and A-rich tandemly repeated sequences, but not particularly in potential G4 forming sequences. Collectively, Pt-ttpy presents dual targeting efficiency on DNA, by inducing telomere dysfunction and genomic DNA damage at specific loci.
Collapse
Affiliation(s)
- Samar Ali
- INSERM UMRS 1007, Université de Paris, 75006 Paris, France
| | - Emilia Puig Lombardi
- Institut Curie, PSL Research University, CNRS UMR3244, Sorbonne Université, Telomeres and Cancer lab, 75005 Paris, France
| | - Deepanjan Ghosh
- Institut Curie, CNRS UMR9187-INSERMU1196, CMBC, 91405 Orsay, France.,Institut Curie, CNRS UMR9187-INSERMU1196, Université Paris-Saclay, 91405 Orsay, France
| | - Tao Jia
- Institut Curie, CNRS UMR9187-INSERMU1196, CMBC, 91405 Orsay, France.,Institut Curie, CNRS UMR9187-INSERMU1196, Université Paris-Saclay, 91405 Orsay, France
| | | | - Lina Saker
- INSERM UMRS 1007, Université de Paris, 75006 Paris, France
| | - Joël Poupon
- Hôpital Lariboisière, Laboratoire de Toxicologie Biologique, 2 rue Ambroise Paré, 75475 Paris, France
| | - Marie-Paule Teulade-Fichou
- Institut Curie, CNRS UMR9187-INSERMU1196, CMBC, 91405 Orsay, France.,Institut Curie, CNRS UMR9187-INSERMU1196, Université Paris-Saclay, 91405 Orsay, France
| | - Alain Nicolas
- Institut Curie, PSL Research University, CNRS UMR3244, Sorbonne Université, Telomeres and Cancer lab, 75005 Paris, France
| | - Arturo Londono-Vallejo
- Institut Curie, PSL Research University, CNRS UMR3244, Sorbonne Université, Telomeres and Cancer lab, 75005 Paris, France
| | - Sophie Bombard
- Institut Curie, CNRS UMR9187-INSERMU1196, CMBC, 91405 Orsay, France.,Institut Curie, CNRS UMR9187-INSERMU1196, Université Paris-Saclay, 91405 Orsay, France
| |
Collapse
|
4
|
Craciun AM, Rotaru A, Cojocaru C, Mangalagiu II, Danac R. New 2,9-disubstituted-1,10-phenanthroline derivatives with anticancer activity by selective targeting of telomeric G-quadruplex DNA. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2021; 249:119318. [PMID: 33360205 DOI: 10.1016/j.saa.2020.119318] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2020] [Revised: 11/26/2020] [Accepted: 12/05/2020] [Indexed: 06/12/2023]
Abstract
Fifteen new 1,10-phenanthrolines disubstituted at positions 2 and 9 via amide bonds with different heterocycles have been designed and synthesized as G-quadruplex DNA stabilizers. Ten compounds were evaluated for the in vitro anticancer activity against 60 human tumor cell lines panel, four of them showing a very good inhibitory activity on several cell lines. To assess the ability of the most active compounds to interact with G-quadruplex DNA (G4-DNA), circular dichroism experiments were performed. The potency of the compounds to stabilize the G4-DNA has been shown from the thermal denaturation experiments. The mechanism of compounds binding to DNA and to G4-DNA was theoretically investigated by molecular docking studies. The experimental results demonstrated excellent capacity of the two compounds bearing two pyridin-3-yl residues (methylated and non-methylated) to act as selective G-quadruplex binders with promising anticancer activity.
Collapse
Affiliation(s)
- Anda-Mihaela Craciun
- Chemistry Department, Faculty of Chemistry, "Al. I. Cuza" University of Iasi, 11 Carol I, Iasi 700506, Romania; "Petru Poni" Institute of Macromolecular Chemistry, 41A, Grigore Ghica Voda Alley, Iasi 700487, Romania
| | - Alexandru Rotaru
- "Petru Poni" Institute of Macromolecular Chemistry, 41A, Grigore Ghica Voda Alley, Iasi 700487, Romania
| | - Corneliu Cojocaru
- "Petru Poni" Institute of Macromolecular Chemistry, 41A, Grigore Ghica Voda Alley, Iasi 700487, Romania
| | - Ionel I Mangalagiu
- Chemistry Department, Faculty of Chemistry, "Al. I. Cuza" University of Iasi, 11 Carol I, Iasi 700506, Romania
| | - Ramona Danac
- Chemistry Department, Faculty of Chemistry, "Al. I. Cuza" University of Iasi, 11 Carol I, Iasi 700506, Romania.
| |
Collapse
|
5
|
Gadgil RY, Romer EJ, Goodman CC, Rider SD, Damewood FJ, Barthelemy JR, Shin-Ya K, Hanenberg H, Leffak M. Replication stress at microsatellites causes DNA double-strand breaks and break-induced replication. J Biol Chem 2020; 295:15378-15397. [PMID: 32873711 DOI: 10.1074/jbc.ra120.013495] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2020] [Revised: 08/23/2020] [Indexed: 12/12/2022] Open
Abstract
Short tandemly repeated DNA sequences, termed microsatellites, are abundant in the human genome. These microsatellites exhibit length instability and susceptibility to DNA double-strand breaks (DSBs) due to their tendency to form stable non-B DNA structures. Replication-dependent microsatellite DSBs are linked to genome instability signatures in human developmental diseases and cancers. To probe the causes and consequences of microsatellite DSBs, we designed a dual-fluorescence reporter system to detect DSBs at expanded (CTG/CAG) n and polypurine/polypyrimidine (Pu/Py) mirror repeat structures alongside the c-myc replication origin integrated at a single ectopic chromosomal site. Restriction cleavage near the (CTG/CAG)100 microsatellite leads to homology-directed single-strand annealing between flanking AluY elements and reporter gene deletion that can be detected by flow cytometry. However, in the absence of restriction cleavage, endogenous and exogenous replication stressors induce DSBs at the (CTG/CAG)100 and Pu/Py microsatellites. DSBs map to a narrow region at the downstream edge of the (CTG)100 lagging-strand template. (CTG/CAG) n chromosome fragility is repeat length-dependent, whereas instability at the (Pu/Py) microsatellites depends on replication polarity. Strikingly, restriction-generated DSBs and replication-dependent DSBs are not repaired by the same mechanism. Knockdown of DNA damage response proteins increases (Rad18, polymerase (Pol) η, Pol κ) or decreases (Mus81) the sensitivity of the (CTG/CAG)100 microsatellites to replication stress. Replication stress and DSBs at the ectopic (CTG/CAG)100 microsatellite lead to break-induced replication and high-frequency mutagenesis at a flanking thymidine kinase gene. Our results show that non-B structure-prone microsatellites are susceptible to replication-dependent DSBs that cause genome instability.
Collapse
Affiliation(s)
- Rujuta Yashodhan Gadgil
- Department of Biochemistry and Molecular Biology, Boonshoft School of Medicine, Wright State University, Dayton, Ohio, USA
| | - Eric J Romer
- Department of Biochemistry and Molecular Biology, Boonshoft School of Medicine, Wright State University, Dayton, Ohio, USA
| | - Caitlin C Goodman
- Department of Biochemistry and Molecular Biology, Boonshoft School of Medicine, Wright State University, Dayton, Ohio, USA
| | - S Dean Rider
- Department of Biochemistry and Molecular Biology, Boonshoft School of Medicine, Wright State University, Dayton, Ohio, USA
| | - French J Damewood
- Department of Biochemistry and Molecular Biology, Boonshoft School of Medicine, Wright State University, Dayton, Ohio, USA
| | - Joanna R Barthelemy
- Department of Biochemistry and Molecular Biology, Boonshoft School of Medicine, Wright State University, Dayton, Ohio, USA
| | - Kazuo Shin-Ya
- Biomedical Information Research Center, National Institute of Advanced Industrial Science and Technology, Tokyo, Japan
| | - Helmut Hanenberg
- Department of Otorhinolaryngology and Head/Neck Surgery, Heinrich Heine University, Düsseldorf, Germany; Department of Pediatrics III, University Children's Hospital Essen, University of Duisburg-Essen, Essen, Germany
| | - Michael Leffak
- Department of Biochemistry and Molecular Biology, Boonshoft School of Medicine, Wright State University, Dayton, Ohio, USA.
| |
Collapse
|
6
|
Bryan TM. G-Quadruplexes at Telomeres: Friend or Foe? Molecules 2020; 25:molecules25163686. [PMID: 32823549 PMCID: PMC7464828 DOI: 10.3390/molecules25163686] [Citation(s) in RCA: 86] [Impact Index Per Article: 21.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2020] [Revised: 08/09/2020] [Accepted: 08/10/2020] [Indexed: 12/28/2022] Open
Abstract
Telomeres are DNA-protein complexes that cap and protect the ends of linear chromosomes. In almost all species, telomeric DNA has a G/C strand bias, and the short tandem repeats of the G-rich strand have the capacity to form into secondary structures in vitro, such as four-stranded G-quadruplexes. This has long prompted speculation that G-quadruplexes play a positive role in telomere biology, resulting in selection for G-rich tandem telomere repeats during evolution. There is some evidence that G-quadruplexes at telomeres may play a protective capping role, at least in yeast, and that they may positively affect telomere maintenance by either the enzyme telomerase or by recombination-based mechanisms. On the other hand, G-quadruplex formation in telomeric DNA, as elsewhere in the genome, can form an impediment to DNA replication and a source of genome instability. This review summarizes recent evidence for the in vivo existence of G-quadruplexes at telomeres, with a focus on human telomeres, and highlights some of the many unanswered questions regarding the location, form, and functions of these structures.
Collapse
Affiliation(s)
- Tracy M Bryan
- Children's Medical Research Institute, Faculty of Medicine and Health, University of Sydney, Westmead, NSW 2145, Australia
| |
Collapse
|
7
|
Raising the bar in anticancer therapy: recent advances in, and perspectives on, telomerase inhibitors. Drug Discov Today 2019; 24:1370-1388. [PMID: 31136800 DOI: 10.1016/j.drudis.2019.05.015] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2019] [Revised: 05/02/2019] [Accepted: 05/21/2019] [Indexed: 02/06/2023]
Abstract
Telomerase is a ribonucleic reverse transcriptase enzyme that uses an integral RNA component as a template to add tandem telomeric DNA repeats, TTAGGG, at the 3' end of the chromosomes. 85-90% of human tumors and their derived cell lines predominantly express high levels of telomerase, therefore contributing to cancer cell development. However, in normal cells, telomerase activity is almost always absent except in germ cells and stem cells. This differential expression has been exploited to develop highly specific and potent cancer therapeutics. In this review, we outline recent advances in the development of telomerase inhibitors as anticancer agents.
Collapse
|
8
|
Saker L, Ali S, Masserot C, Kellermann G, Poupon J, Teulade-Fichou MP, Ségal-Bendirdjian E, Bombard S. Platinum Complexes Can Bind to Telomeres by Coordination. Int J Mol Sci 2018; 19:E1951. [PMID: 29970863 PMCID: PMC6073198 DOI: 10.3390/ijms19071951] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2018] [Revised: 06/27/2018] [Accepted: 06/29/2018] [Indexed: 01/07/2023] Open
Abstract
It is suggested that several compounds, including G-quadruplex ligands, can target telomeres, inducing their uncapping and, ultimately, cell death. However, it has never been demonstrated whether such ligands can bind directly and quantitatively to telomeres. Here, we employed the property of platinum and platinum-G-quadruplex complexes to target G-rich sequences to investigate and quantify their covalent binding to telomeres. Using inductively coupled plasma mass spectrometry, surprisingly, we found that, in cellulo, in the presence of cisplatin, a di-functional platinum complex, telomeric DNA was platinated 13-times less than genomic DNA in cellulo, as compared to in vitro data. On the contrary, the amount of mono-functional platinum complexes (Pt-ttpy and Pt-tpy) bound either to telomeric or to genomic DNA was similar and occurred in a G-quadruplex independent-manner. Importantly, the quantification revealed that the low level of cisplatin bound to telomeric DNA could not be the direct physical cause of TRF2 displacement from telomeres. Altogether, our data suggest that platinum complexes can affect telomeres both directly and indirectly.
Collapse
Affiliation(s)
- Lina Saker
- INSERM UMR-S 1007, Cellular Homeostasis and Cancer, 75006 Paris, France.
- Paris Descartes University, Paris Sorbonne Cité, 75006 Paris, France.
| | - Samar Ali
- INSERM UMR-S 1007, Cellular Homeostasis and Cancer, 75006 Paris, France.
- Paris Sud University, Paris-Saclay University, 91405 Orsay, France.
| | - Caroline Masserot
- INSERM UMR-S 1007, Cellular Homeostasis and Cancer, 75006 Paris, France.
- Paris Sud University, Paris-Saclay University, 91405 Orsay, France.
| | - Guillaume Kellermann
- INSERM UMR-S 1007, Cellular Homeostasis and Cancer, 75006 Paris, France.
- Paris Descartes University, Paris Sorbonne Cité, 75006 Paris, France.
| | - Joel Poupon
- Laboratoire de Toxicologie-Biologique, Hôpital Lariboisière, 2 rue Ambroise Paré, 75475 Paris, France.
| | - Marie-Paule Teulade-Fichou
- Paris Sud University, Paris-Saclay University, 91405 Orsay, France.
- Institut Curie-Recherche, Bât. 112, Centre Universitaire, 91405 Orsay, France.
- CNRS UMR918, Centre Universitaire, 91405 Orsay, France.
- INSERM U1196, Centre Universitaire, 91405 Orsay, France.
| | - Evelyne Ségal-Bendirdjian
- INSERM UMR-S 1007, Cellular Homeostasis and Cancer, 75006 Paris, France.
- Paris Descartes University, Paris Sorbonne Cité, 75006 Paris, France.
- Paris Sud University, Paris-Saclay University, 91405 Orsay, France.
| | - Sophie Bombard
- INSERM UMR-S 1007, Cellular Homeostasis and Cancer, 75006 Paris, France.
- Paris Descartes University, Paris Sorbonne Cité, 75006 Paris, France.
- Paris Sud University, Paris-Saclay University, 91405 Orsay, France.
- Institut Curie-Recherche, Bât. 112, Centre Universitaire, 91405 Orsay, France.
- CNRS UMR918, Centre Universitaire, 91405 Orsay, France.
- INSERM U1196, Centre Universitaire, 91405 Orsay, France.
| |
Collapse
|
9
|
Zhou G, Liu X, Li Y, Xu S, Ma C, Wu X, Cheng Y, Yu Z, Zhao G, Chen Y. Telomere targeting with a novel G-quadruplex-interactive ligand BRACO-19 induces T-loop disassembly and telomerase displacement in human glioblastoma cells. Oncotarget 2017; 7:14925-39. [PMID: 26908447 PMCID: PMC4924762 DOI: 10.18632/oncotarget.7483] [Citation(s) in RCA: 62] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2015] [Accepted: 01/29/2016] [Indexed: 12/12/2022] Open
Abstract
Interference with telomerase and telomere maintenance is emerging as an attractive target for anticancer therapies. Ligand-induced stabilization of G-quadruplex formation by the telomeric DNA 3'-overhang inhibits telomerase from catalyzing telomeric DNA synthesis and from capping telomeric ends, making these ligands good candidates for chemotherapeutic purposes. BRACO-19 is one of the most effective and specific ligand for telomeric G4. It is shown here that BRACO-19 suppresses proliferation and reduces telomerase activity in human glioblastoma cells, paralleled by the displacement of telomerase from nuclear to cytoplasm. Meanwhile, BRACO-19 triggers extensive DNA damage response at telomere, which may result from uncapping and disassembly of telomeric T-loop structure, characterized by the formation of anaphase bridge and telomere fusion, as well as the release of telomere-binding protein from telomere. The resulting dysfunctional telomere ultimately provokes p53 and p21-mediated cell cycle arrest, apoptosis and senescence. Notably, normal primary astrocytes do not respond to the treatment of BRACO-19, suggesting the agent's good selectivity for cancer cells. These results reinforce the notion that G-quadruplex binding compounds can act as broad inhibitors of telomere-related processes and have potential as selective antineoplastic drugs for various tumors including malignant gliomas.
Collapse
Affiliation(s)
- Guangtong Zhou
- Department of Neurosurgery, First Hospital of Jilin University, Changchun, China
| | - Xinrui Liu
- Department of Neurosurgery, First Hospital of Jilin University, Changchun, China
| | - Yunqian Li
- Department of Neurosurgery, First Hospital of Jilin University, Changchun, China
| | - Songbai Xu
- Department of Neurosurgery, First Hospital of Jilin University, Changchun, China
| | - Chengyuan Ma
- Department of Neurosurgery, First Hospital of Jilin University, Changchun, China
| | - Xinmin Wu
- Department of Neurosurgery, First Hospital of Jilin University, Changchun, China
| | - Ye Cheng
- Department of Neurosurgery, First Hospital of Jilin University, Changchun, China
| | - Zhiyun Yu
- Department of Neurosurgery, First Hospital of Jilin University, Changchun, China
| | - Gang Zhao
- Department of Neurosurgery, First Hospital of Jilin University, Changchun, China
| | - Yong Chen
- Department of Neurosurgery, First Hospital of Jilin University, Changchun, China
| |
Collapse
|
10
|
Lancrey A, Safa L, Chatain J, Delagoutte E, Riou JF, Alberti P, Saintomé C. The binding efficiency of RPA to telomeric G-strands folded into contiguous G-quadruplexes is independent of the number of G4 units. Biochimie 2017; 146:68-72. [PMID: 29191792 DOI: 10.1016/j.biochi.2017.11.017] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2017] [Accepted: 11/24/2017] [Indexed: 11/18/2022]
Abstract
Replication protein A (RPA) is a single-stranded DNA binding protein involved in replication and in telomere maintenance. During telomere replication, G-quadruplexes (G4) can accumulate on the lagging strand template and need to be resolved. It has been shown that human RPA is able to unfold a single G4. Nevertheless, the G-strand of human telomeres is prone to fold into higher-order structures formed by contiguous G-quadruplexes. To understand how RPA deals with these structures, we studied its interaction with telomeric G-strands folding into an increasing number of contiguous G4s. The aim of this study was to determine whether the efficiency of binding/unfolding of hRPA to telomeric G-strands depends on the number of G4 units. Our data show that the number n of contiguous G4 units (n ≥ 2) does not affect the efficiency of hRPA to coat transiently exposed single-stranded telomeric G-strands. This feature may be essential in preventing instability due to G4 structures during telomere replication.
Collapse
Affiliation(s)
- Astrid Lancrey
- Structure et Instabilité des Génomes, Sorbonne Universités, Muséum National d'Histoire Naturelle, CNRS UMR 7196, INSERM U1154, 43 rue Cuvier, F-75005, Paris, France
| | - Layal Safa
- Structure et Instabilité des Génomes, Sorbonne Universités, Muséum National d'Histoire Naturelle, CNRS UMR 7196, INSERM U1154, 43 rue Cuvier, F-75005, Paris, France
| | - Jean Chatain
- Structure et Instabilité des Génomes, Sorbonne Universités, Muséum National d'Histoire Naturelle, CNRS UMR 7196, INSERM U1154, 43 rue Cuvier, F-75005, Paris, France
| | - Emmanuelle Delagoutte
- Structure et Instabilité des Génomes, Sorbonne Universités, Muséum National d'Histoire Naturelle, CNRS UMR 7196, INSERM U1154, 43 rue Cuvier, F-75005, Paris, France
| | - Jean-François Riou
- Structure et Instabilité des Génomes, Sorbonne Universités, Muséum National d'Histoire Naturelle, CNRS UMR 7196, INSERM U1154, 43 rue Cuvier, F-75005, Paris, France
| | - Patrizia Alberti
- Structure et Instabilité des Génomes, Sorbonne Universités, Muséum National d'Histoire Naturelle, CNRS UMR 7196, INSERM U1154, 43 rue Cuvier, F-75005, Paris, France.
| | - Carole Saintomé
- Structure et Instabilité des Génomes, Sorbonne Universités, Muséum National d'Histoire Naturelle, CNRS UMR 7196, INSERM U1154, 43 rue Cuvier, F-75005, Paris, France; Sorbonne Universités, UPMC Univ Paris 06, UFR927, F-75005, Paris, France.
| |
Collapse
|
11
|
Charif R, Granotier-Beckers C, Bertrand HC, Poupon J, Ségal-Bendirdjian E, Teulade-Fichou MP, Boussin FD, Bombard S. Association of a Platinum Complex to a G-Quadruplex Ligand Enhances Telomere Disruption. Chem Res Toxicol 2017; 30:1629-1640. [DOI: 10.1021/acs.chemrestox.7b00131] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Razan Charif
- Université
Paris Descartes, INSERM UMR-S-1007, 45 rue des Saints-Pères, 75006 Paris, France
| | - Christine Granotier-Beckers
- CEA/DRF/IRCM,
Laboratoire de RadioPathologie, INSERM U967, Université Paris
VII, Université Paris XI, 18
route du Panorama, 92265 Fontenay-aux-Roses Cedex, France
| | - Hélène Charlotte Bertrand
- Institut
Curie,
Centre Universitaire Paris Saclay, CNRS UMR9187/INSERM U1196, Bâtiments 110-112, 91405 Orsay, France
- Département
de Chimie, Ecole Normale Supérieure, PSL Research University,
UPMC Univ Paris 06, CNRS, Laboratoire des Biomolécules (LBM), 24 rue Lhomond, 75005 Paris, France
- Sorbonne Universités,
UPMC Univ Paris 06, Ecole Normale Supérieure, CNRS, Laboratoire
des Biomolécules (LBM), 24 rue
Lhomond, 75005 Paris, France
| | - Joël Poupon
- Laboratoire
de Toxicologie-Biologique, Hôpital Lariboisière, 2 rue Ambroise Paré, 75475 Paris, France
| | | | - Marie-Paule Teulade-Fichou
- Institut
Curie,
Centre Universitaire Paris Saclay, CNRS UMR9187/INSERM U1196, Bâtiments 110-112, 91405 Orsay, France
| | - François D. Boussin
- CEA/DRF/IRCM,
Laboratoire de RadioPathologie, INSERM U967, Université Paris
VII, Université Paris XI, 18
route du Panorama, 92265 Fontenay-aux-Roses Cedex, France
| | - Sophie Bombard
- Université
Paris Descartes, INSERM UMR-S-1007, 45 rue des Saints-Pères, 75006 Paris, France
- Institut
Curie,
Centre Universitaire Paris Saclay, CNRS UMR9187/INSERM U1196, Bâtiments 110-112, 91405 Orsay, France
| |
Collapse
|
12
|
Mulholland K, Wu C. Binding of Telomestatin to a Telomeric G-Quadruplex DNA Probed by All-Atom Molecular Dynamics Simulations with Explicit Solvent. J Chem Inf Model 2016; 56:2093-2102. [DOI: 10.1021/acs.jcim.6b00473] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Kelly Mulholland
- College of Science and Mathematics, Rowan University, Glassboro, New Jersey 08028, United States
| | - Chun Wu
- College of Science and Mathematics, Rowan University, Glassboro, New Jersey 08028, United States
| |
Collapse
|
13
|
Safa L, Gueddouda NM, Thiébaut F, Delagoutte E, Petruseva I, Lavrik O, Mendoza O, Bourdoncle A, Alberti P, Riou JF, Saintomé C. 5' to 3' Unfolding Directionality of DNA Secondary Structures by Replication Protein A: G-QUADRUPLEXES AND DUPLEXES. J Biol Chem 2016; 291:21246-21256. [PMID: 27440048 DOI: 10.1074/jbc.m115.709667] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2015] [Indexed: 11/06/2022] Open
Abstract
The replication protein A (RPA) is a single-stranded DNA-binding protein that plays an essential role in DNA metabolism. RPA is able to unfold G-quadruplex (G4) structures formed by telomeric DNA sequences, a function important for telomere maintenance. To elucidate the mechanism through which RPA unfolds telomeric G4s, we studied its interaction with oligonucleotides that adopt a G4 structure extended with a single-stranded tail on either side of the G4. Binding and unfolding was characterized using several biochemical and biophysical approaches and in the presence of specific G4 ligands, such as telomestatin and 360A. Our data show that RPA can bind on each side of the G4 but it unwinds the G4 only from 5' toward 3'. We explain the 5' to 3' unfolding directionality in terms of the 5' to 3' oriented laying out of hRPA subunits along single-stranded DNA. Furthermore, we demonstrate by kinetics experiments that RPA proceeds with the same directionality for duplex unfolding.
Collapse
Affiliation(s)
- Layal Safa
- From the Structure et Instabilité des Génomes, Sorbonne Universités, Muséum National d'Histoire Naturelle, INSERM U1154, CNRS UMR 7196, CP26, 57 rue Cuvier, 75005, Paris, France, the Sorbonne Universités, UPMC University Paris 06, F-75005, Paris, France
| | - Nassima Meriem Gueddouda
- the Laboratoire ARNA-INSERM U1212, UMR 5320, Institut européen de chimie et biologie, 2 rue Robert Escarpit, 33607 Pessac, France
| | - Frédéric Thiébaut
- From the Structure et Instabilité des Génomes, Sorbonne Universités, Muséum National d'Histoire Naturelle, INSERM U1154, CNRS UMR 7196, CP26, 57 rue Cuvier, 75005, Paris, France, the Sorbonne Universités, UPMC University Paris 06, F-75005, Paris, France, the Ecole Normale Supérieure, PSL Research University, Département de Chimie, 24 rue Lhomond, CNRS, UMR 7203 LBM, 75005 Paris, France, and
| | - Emmanuelle Delagoutte
- From the Structure et Instabilité des Génomes, Sorbonne Universités, Muséum National d'Histoire Naturelle, INSERM U1154, CNRS UMR 7196, CP26, 57 rue Cuvier, 75005, Paris, France
| | - Irina Petruseva
- the Novosibirsk Institute of Chemical Biology and Fundamental Medecine, Siberian Division of Russian Academy of Science, 630090 Novosibirsk, Russia
| | - Olga Lavrik
- the Novosibirsk Institute of Chemical Biology and Fundamental Medecine, Siberian Division of Russian Academy of Science, 630090 Novosibirsk, Russia
| | - Oscar Mendoza
- the Laboratoire ARNA-INSERM U1212, UMR 5320, Institut européen de chimie et biologie, 2 rue Robert Escarpit, 33607 Pessac, France
| | - Anne Bourdoncle
- the Laboratoire ARNA-INSERM U1212, UMR 5320, Institut européen de chimie et biologie, 2 rue Robert Escarpit, 33607 Pessac, France
| | - Patrizia Alberti
- From the Structure et Instabilité des Génomes, Sorbonne Universités, Muséum National d'Histoire Naturelle, INSERM U1154, CNRS UMR 7196, CP26, 57 rue Cuvier, 75005, Paris, France,
| | - Jean-François Riou
- From the Structure et Instabilité des Génomes, Sorbonne Universités, Muséum National d'Histoire Naturelle, INSERM U1154, CNRS UMR 7196, CP26, 57 rue Cuvier, 75005, Paris, France
| | - Carole Saintomé
- From the Structure et Instabilité des Génomes, Sorbonne Universités, Muséum National d'Histoire Naturelle, INSERM U1154, CNRS UMR 7196, CP26, 57 rue Cuvier, 75005, Paris, France, the Sorbonne Universités, UPMC University Paris 06, F-75005, Paris, France,
| |
Collapse
|
14
|
Su CH, Cheng C, Tzeng TY, Lin IH, Hsu MT. An H2A Histone Isotype, H2ac, Associates with Telomere and Maintains Telomere Integrity. PLoS One 2016; 11:e0156378. [PMID: 27228173 PMCID: PMC4882029 DOI: 10.1371/journal.pone.0156378] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2016] [Accepted: 05/13/2016] [Indexed: 11/19/2022] Open
Abstract
Telomeres are capped at the ends of eukaryotic chromosomes and are composed of TTAGGG repeats bound to the shelterin complex. Here we report that a replication-dependent histone H2A isotype, H2ac, was associated with telomeres in human cells and co-immunoprecipitates with telomere repeat factor 2 (TRF2) and protection of telomeres protein 1 (POT1), whereas other histone H2A isotypes and mutations of H2ac did not bind to telomeres or these two proteins. The amino terminal basic domain of TRF2 was necessary for the association with H2ac and for the recruitment of H2ac to telomeres. Depletion of H2ac led to loss of telomeric repeat sequences, the appearance of dysfunctional telomeres, and chromosomal instability, including chromosomal breaks and anaphase bridges, as well as accumulation of telomere-associated DNA damage factors in H2ac depleted cells. Additionally, knockdown of H2ac elicits an ATM-dependent DNA damage response at telomeres and depletion of XPF protects telomeres against H2ac-deficiency-induced G-strand overhangs loss and DNA damage response, and prevents chromosomal instability. These findings suggest that the H2A isotype, H2ac, plays an essential role in maintaining telomere functional integrity.
Collapse
Affiliation(s)
- Chia-Hsin Su
- Institute of Biochemistry and Molecular Biology, School of Life Science, National Yang-Ming University, Taipei, 11221, Taiwan, Republic of China
| | - Ching Cheng
- Institute of Biochemistry and Molecular Biology, School of Life Science, National Yang-Ming University, Taipei, 11221, Taiwan, Republic of China
| | - Tsai-Yu Tzeng
- VYM Genome Research Center, National Yang-Ming University, University System of Taiwan, Taipei, 11221, Taiwan, Republic of China
| | - I-Hsuan Lin
- Institute of Biochemistry and Molecular Biology, School of Life Science, National Yang-Ming University, Taipei, 11221, Taiwan, Republic of China
| | - Ming-Ta Hsu
- Institute of Biochemistry and Molecular Biology, School of Life Science, National Yang-Ming University, Taipei, 11221, Taiwan, Republic of China
- VYM Genome Research Center, National Yang-Ming University, University System of Taiwan, Taipei, 11221, Taiwan, Republic of China
- Chien-Tien Hsu Cancer Research Foundation, Taipei, 11221, Taiwan, Republic of China
- * E-mail:
| |
Collapse
|
15
|
G-Quadruplex ligands: Potent inhibitors of telomerase activity and cell proliferation in Plasmodium falciparum. Mol Biochem Parasitol 2016; 207:33-8. [DOI: 10.1016/j.molbiopara.2016.05.009] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2015] [Revised: 04/10/2016] [Accepted: 05/19/2016] [Indexed: 12/11/2022]
|
16
|
G-quadruplex ligand-induced DNA damage response coupled with telomere dysfunction and replication stress in glioma stem cells. Biochem Biophys Res Commun 2016; 471:75-81. [PMID: 26845351 DOI: 10.1016/j.bbrc.2016.01.176] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2016] [Accepted: 01/28/2016] [Indexed: 11/24/2022]
Abstract
Glioblastoma (GBM) is an invariably fatal brain tumor in which a small subpopulation of self-renewable glioma stem cells (GSCs) contributes to tumor propagation and relapse. Targeting GSCs could therefore have a significant clinical impact for GBM. Telomestatin is a naturally-occurring compound that preferentially impairs GSC growth by perturbing transcription and inducing a DNA damage response. Telomestatin stabilizes G-quadruplexes (G4s), which are guanine-rich four-strand nucleic acid structures observed in vitro and in vivo. However, the mechanism underlying the GSC-selective nature of the DNA damage response remains unknown. Here we demonstrate that GSCs are more susceptible to telomestatin-induced telomere dysfunction and replication stress when compared with GSC-derived non-stem glioma cells (NSGCs). Telomestatin induced dissociation of the telomere-capping protein TRF2 from telomeres, leading to telomeric DNA damage in GSCs-but not in NSGCs. BIBR1532, a telomerase catalytic inhibitor, did not preferentially inhibit GSC growth, suggesting that telomestatin promotes telomere dysfunction in a telomerase-independent manner. GSCs and NSGCs had comparable levels of G4s in their nuclei, and both responded to telomestatin with phosphorylation of RPA2 at Ser33-a hallmark of replication stress. However, activation of the checkpoint kinase Chk1, induction of a DNA damage response, and subsequent growth inhibition occurred only in telomestatin-treated GSCs. These observations suggest that telomestatin impairs GSC growth through removal of TRF2 from telomeres and potent activation of the replication stress response pathway. Therefore, a novel G4-directed therapeutic strategy could specifically target cancer stem cells in GBM.
Collapse
|
17
|
Highly efficient radiosensitization of human glioblastoma and lung cancer cells by a G-quadruplex DNA binding compound. Sci Rep 2015; 5:16255. [PMID: 26542881 PMCID: PMC4635363 DOI: 10.1038/srep16255] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2015] [Accepted: 10/12/2015] [Indexed: 12/24/2022] Open
Abstract
Telomeres are nucleoprotein structures at the end of chromosomes which stabilize and protect them from nucleotidic degradation and end-to-end fusions. The G-rich telomeric single-stranded DNA overhang can adopt a four-stranded G-quadruplex DNA structure (G4). Stabilization of the G4 structure by binding of small molecule ligands enhances radiosensitivity of tumor cells, and this combined treatment represents a novel anticancer approach. We studied the effect of the platinum-derived G4-ligand, Pt-ctpy, in association with radiation on human glioblastoma (SF763 and SF767) and non-small cell lung cancer (A549 and H1299) cells in vitro and in vivo. Treatments with submicromolar concentrations of Pt-ctpy inhibited tumor proliferation in vitro with cell cycle alterations and induction of apoptosis. Non-toxic concentrations of the ligand were then combined with ionizing radiation. Pt-ctpy radiosensitized all cell lines with dose-enhancement factors between 1.32 and 1.77. The combined treatment led to increased DNA breaks. Furthermore, a significant radiosensitizing effect of Pt-ctpy in mice xenografted with glioblastoma SF763 cells was shown by delayed tumor growth and improved survival. Pt-ctpy can act in synergy with radiation for efficient killing of cancer cells at concentrations at which it has no obvious toxicity per se, opening perspectives for future therapeutic applications.
Collapse
|
18
|
Maida Y, Masutomi K. Telomerase reverse transcriptase moonlights: Therapeutic targets beyond telomerase. Cancer Sci 2015; 106:1486-92. [PMID: 26331588 PMCID: PMC4714691 DOI: 10.1111/cas.12806] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2015] [Revised: 08/25/2015] [Accepted: 08/26/2015] [Indexed: 12/26/2022] Open
Abstract
Telomeres, the repetitive sequences at chromosomal ends, protect intact chromosomes. Telomeres progressively shorten through successive rounds of cell divisions, and critically shortened telomeres trigger senescence and apoptosis. The enzyme that elongates telomeres and maintains their structure is known as telomerase. The catalytic subunit of this enzyme (telomerase reverse transcriptase [TERT]) is expressed at a high level in malignant cells, but at a very low level in normal cells. Although telomerase activity was long believed to be the only function of TERT, emerging evidence indicates that TERT plays roles beyond telomeres. For example, TERT contributes to stem cell maintenance and cell reprogramming processes in a manner independent of its canonical function. Even some types of splice variants that lack the telomerase catalytic domains exhibit the functions in a manner that does not depend on telomerase activity. We recently demonstrated that the RNA-dependent RNA polymerase (RdRP) activity of TERT is involved in regulation of gene silencing and heterochromatic transcription. Moreover, TERT RdRP activity is mediated by a newly identified complex, distinct from the authentic telomerase complex, that plays a role in cancer stem cells in a telomere maintenance independent manner. TERT has attracted interest as a molecular target for anticancer treatment, but previous efforts aimed at developing novel therapeutic strategies focused only on the canonical function of TERT. However, accumulating evidence about the non-canonical functions of TERT led us to speculate that the functions other than telomerase might be therapeutic targets as well. In this review, we discuss the non-canonical functions of TERT and their potential applications for anticancer treatment.
Collapse
Affiliation(s)
- Yoshiko Maida
- Division of Cancer Stem Cell, National Cancer Center Research Institute, Tokyo, Japan
| | - Kenkichi Masutomi
- Division of Cancer Stem Cell, National Cancer Center Research Institute, Tokyo, Japan
| |
Collapse
|
19
|
Lei H, Feng D, Zhou F, Xu H, Tang T, Yu H, Xie C, Zhou Y. Expression of human protection of telomere 1 correlates with telomere length and radiosensitivity in the human laryngeal cancer Hep-2 cell line. Oncol Lett 2015; 10:1149-1154. [PMID: 26622642 DOI: 10.3892/ol.2015.3332] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2014] [Accepted: 05/15/2015] [Indexed: 11/06/2022] Open
Abstract
The close association between telomere length and radiosensitivity has been established by several studies. There is also a hypothesis that telomere length may be regulated by human protection of telomere 1 (hPOT1) in human carcinoma cells. In the present study, the hPOT1 level between the radioresistant Hep-2R cells and the wild-type were compared, and the results showed that the hPOT1 gene was upregulated in the radioresistant Hep-2R cell lines compared with the wild-type. This suggested that the expression level of hPOT1 correlates with radiosensitivity. Additionally, an hPOT1-directed short hairpin (sh)RNA plasmid was constructed and transferred into the Hep-2R cells, which lead to telomere shortening, an increase in apoptosis and markedly decreased growth of the RNAi-Hep-2R cell line. These results demonstrate that hPOT1-directed shRNAs are associated with telomere length and radiosensitivity, and maybe a potent sensitizer for laryngeal cancer radiotherapy.
Collapse
Affiliation(s)
- Han Lei
- Hubei Cancer Clinical Study Center, Hubei Key Laboratory of Tumor Biological Behaviors, Zhongnan Hospital, Wuhan University, Wuhan, Hubei, P.R. China
| | - Dali Feng
- Hubei Cancer Clinical Study Center, Hubei Key Laboratory of Tumor Biological Behaviors, Zhongnan Hospital, Wuhan University, Wuhan, Hubei, P.R. China
| | - Fuxiang Zhou
- Hubei Cancer Clinical Study Center, Hubei Key Laboratory of Tumor Biological Behaviors, Zhongnan Hospital, Wuhan University, Wuhan, Hubei, P.R. China ; Department of Radiation Oncology and Medical Oncology, Zhongnan Hospital, Wuhan University, Wuhan, Hubei, P.R. China
| | - Hui Xu
- Hubei Cancer Clinical Study Center, Hubei Key Laboratory of Tumor Biological Behaviors, Zhongnan Hospital, Wuhan University, Wuhan, Hubei, P.R. China
| | - Tian Tang
- Hubei Cancer Clinical Study Center, Hubei Key Laboratory of Tumor Biological Behaviors, Zhongnan Hospital, Wuhan University, Wuhan, Hubei, P.R. China
| | - Haijun Yu
- Hubei Cancer Clinical Study Center, Hubei Key Laboratory of Tumor Biological Behaviors, Zhongnan Hospital, Wuhan University, Wuhan, Hubei, P.R. China ; Department of Radiation Oncology and Medical Oncology, Zhongnan Hospital, Wuhan University, Wuhan, Hubei, P.R. China
| | - Conghua Xie
- Hubei Cancer Clinical Study Center, Hubei Key Laboratory of Tumor Biological Behaviors, Zhongnan Hospital, Wuhan University, Wuhan, Hubei, P.R. China ; Department of Radiation Oncology and Medical Oncology, Zhongnan Hospital, Wuhan University, Wuhan, Hubei, P.R. China
| | - Yunfeng Zhou
- Hubei Cancer Clinical Study Center, Hubei Key Laboratory of Tumor Biological Behaviors, Zhongnan Hospital, Wuhan University, Wuhan, Hubei, P.R. China ; Department of Radiation Oncology and Medical Oncology, Zhongnan Hospital, Wuhan University, Wuhan, Hubei, P.R. China
| |
Collapse
|
20
|
Bugaut A, Alberti P. Understanding the stability of DNA G-quadruplex units in long human telomeric strands. Biochimie 2015; 113:125-33. [PMID: 25888167 DOI: 10.1016/j.biochi.2015.04.003] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2015] [Accepted: 04/03/2015] [Indexed: 10/23/2022]
Abstract
Human telomeric DNA is composed of GGGTTA repeats. The presence of consecutive guanines makes the telomeric G-strand prone to fold into contiguous (or tandem) G-quadruplexes (G4s). The aim of this study was to provide a clarified picture of the stability of telomeric tandem G4 structures as a function of the number of G4 units and of boundary sequences, and an understanding of the diversity of their melting behaviors in terms of the single G4 units composing them. To this purpose we undertook an UV-spectroscopic investigation of the structure and stability of telomeric repeats potentially able to fold into up to four contiguous G4s, flanked or not by TTA sequences at their 5' and 3' extremities. We explain why the stability of (GGGTTA)4m-1GGG structures (m = 2, 3, 4 …) decreases with increasing the number m of G4 units, whereas the stability of TTA-(GGGTTA)4m-1GGG-TTA structures does not. Our results support that the inner G4 units have similar stabilities, whereas the stabilities of the terminal G4 units are modulated by their flanking nucleotides: in a TTA-(GGGTTA)4m-1GGG-TTA tandem context, the terminal G4 units are roughly as stable as the inner G4 units; while in a (GGGTTA)4m-1GGG tandem context, the G4 at the 5' extremity is more stable than the G4 at the 3' extremity, which in turn is more stable than an inner G4. Our study provides new information about the global and local stability of telomeric tandem G4 structures under near physiological conditions.
Collapse
Affiliation(s)
- Anthony Bugaut
- Muséum National d'Histoire Naturelle, Sorbonne Universités, 57 rue Cuvier, CP 26, 75005 Paris, France; CNRS UMR 7196, 57 rue Cuvier, CP 26, 75005 Paris, France; Inserm U 1154, 57 rue Cuvier, CP 26, 75005 Paris, France
| | - Patrizia Alberti
- Muséum National d'Histoire Naturelle, Sorbonne Universités, 57 rue Cuvier, CP 26, 75005 Paris, France; CNRS UMR 7196, 57 rue Cuvier, CP 26, 75005 Paris, France; Inserm U 1154, 57 rue Cuvier, CP 26, 75005 Paris, France.
| |
Collapse
|
21
|
Rahman KM, Corcoran DB, Bui TTT, Jackson PJM, Thurston DE. Pyrrolobenzodiazepines (PBDs) do not bind to DNA G-quadruplexes. PLoS One 2014; 9:e105021. [PMID: 25133504 PMCID: PMC4136862 DOI: 10.1371/journal.pone.0105021] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2014] [Accepted: 07/15/2014] [Indexed: 12/11/2022] Open
Abstract
The pyrrolo[2,1-c][1,4] benzodiazepines (PBDs) are a family of sequence-selective, minor-groove binding DNA-interactive agents that covalently attach to guanine residues. A recent publication in this journal (Raju et al, PloS One, 2012, 7, 4, e35920) reported that two PBD molecules were observed to bind with high affinity to the telomeric quadruplex of Tetrahymena glaucoma based on Electrospray Ionisation Mass Spectrometry (ESI-MS), Circular Dichroism, UV-Visible and Fluorescence spectroscopy data. This was a surprising result given the close 3-dimensional shape match between the structure of all PBD molecules and the minor groove of duplex DNA, and the completely different 3-dimensional structure of quadruplex DNA. Therefore, we evaluated the interaction of eight PBD molecules of diverse structure with a range of parallel, antiparallel and mixed DNA quadruplexes using DNA Thermal Denaturation, Circular Dichroism and Molecular Dynamics Simulations. Those PBD molecules without large C8-substitutents had an insignificant affinity for the eight quadruplex types, although those with large π-system-containing C8-substituents (as with the compounds evaluated by Raju and co-workers) were found to interact to some extent. Our molecular dynamics simulations support the likelihood that molecules of this type, including those examined by Raju and co-workers, interact with quadruplex DNA through their C8-substituents rather than the PBD moiety itself. It is important for the literature to be clear on this matter, as the mechanism of action of these agents will be under close scrutiny in the near future due to the growing number of PBD-based agents entering the clinic as both single-agents and as components of antibody-drug conjugates (ADCs).
Collapse
Affiliation(s)
- Khondaker M. Rahman
- Department of Pharmacy, Institute of Pharmaceutical Science, King's College London, London, United Kingdom
- * E-mail: (KMR); (DET)
| | - David B. Corcoran
- Department of Pharmacy, Institute of Pharmaceutical Science, King's College London, London, United Kingdom
| | - Tam T. T. Bui
- Department of Pharmacy, Institute of Pharmaceutical Science, King's College London, London, United Kingdom
| | - Paul J. M. Jackson
- Department of Pharmacy, Institute of Pharmaceutical Science, King's College London, London, United Kingdom
| | - David E. Thurston
- Department of Pharmacy, Institute of Pharmaceutical Science, King's College London, London, United Kingdom
- * E-mail: (KMR); (DET)
| |
Collapse
|
22
|
Liu H, Lv C, Ding B, Wang J, Li S, Zhang Y. Antitumor activity of G-quadruplex-interactive agent TMPyP4 with photodynamic therapy in ovarian carcinoma cells. Oncol Lett 2014; 8:409-413. [PMID: 24959286 PMCID: PMC4063630 DOI: 10.3892/ol.2014.2125] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2013] [Accepted: 03/20/2014] [Indexed: 11/06/2022] Open
Abstract
The aim of the present study was to investigate the potential effects of photodynamic therapy (PDT) mediated by the cationic porphyrin, 5,10,15,20-tetra-(N-methyl-4-pyridyl)porphine (TMPyP4), on an ovarian carcinoma cell line and the underlying mechanisms by which TMPyP4-PDT exerts its actions. The analysis of cell viability, hematoxylin and eosin staining and flow cytometric apoptosis assays revealed that TMPyP4-PDT potently suppressed the growth of the A2780 cells in a laser energy- and dose-dependent manner. Mechanically, it was observed that TMPyP4-PDT suppressed the proliferation and motility of the A2780 cells. In addition, the expression levels of minichromosome maintenance protein-2 (MCM2) and carbonic anhydrase IX (CA-IX) were detected by western blot analysis. The results indicated that the TMPyP4-PDT-induced apoptosis and antimetastatic activity in the A2780 cells was accompanied by the inhibition of the expression of MCM2 and CA-IX. Therefore, TMPyP4-PDT may represent a potential therapeutic method for the treatment of ovarian carcinoma.
Collapse
Affiliation(s)
- Hongli Liu
- Department of Obstetrics and Gynecology, Qilu Hospital of Shandong University, Jinan, Shandong 250012, P.R. China
| | - Changshuai Lv
- Department of Obstetrics and Gynecology, Qilu Hospital of Shandong University, Jinan, Shandong 250012, P.R. China
| | - Baijuan Ding
- Department of Obstetrics and Gynecology, Qilu Hospital of Shandong University, Jinan, Shandong 250012, P.R. China
| | - Jie Wang
- Department of Obstetrics and Gynecology, Qilu Hospital of Shandong University, Jinan, Shandong 250012, P.R. China
| | - Shan Li
- Department of Obstetrics and Gynecology, Qilu Hospital of Shandong University, Jinan, Shandong 250012, P.R. China
| | - Youzhong Zhang
- Department of Obstetrics and Gynecology, Qilu Hospital of Shandong University, Jinan, Shandong 250012, P.R. China
| |
Collapse
|
23
|
Safa L, Delagoutte E, Petruseva I, Alberti P, Lavrik O, Riou JF, Saintomé C. Binding polarity of RPA to telomeric sequences and influence of G-quadruplex stability. Biochimie 2014; 103:80-8. [PMID: 24747047 DOI: 10.1016/j.biochi.2014.04.006] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2013] [Accepted: 04/09/2014] [Indexed: 01/01/2023]
Abstract
Replication protein A (RPA) is a single-stranded DNA binding protein that plays an essential role in telomere maintenance. RPA binds to and unfolds G-quadruplex (G4) structures formed in telomeric DNA, thus facilitating lagging strand DNA replication and telomerase activity. To investigate the effect of G4 stability on the interactions with human RPA (hRPA), we used a combination of biochemical and biophysical approaches. Our data revealed an inverse relationship between G4 stability and ability of hRPA to bind to telomeric DNA; notably small G4 ligands that enhance G4 stability strongly impaired G4 unfolding by hRPA. To gain more insight into the mechanism of binding and unfolding of telomeric G4 structures by RPA, we carried out photo-crosslinking experiments to elucidate the spatial arrangement of the RPA subunits along the DNA strands. Our results showed that RPA1 and RPA2 are arranged from 5' to 3' along the unfolded telomeric G4, as already described for unstructured single-stranded DNA, while no contact is possible with RPA3 on this short oligonucleotide. In addition, these data are compatible with a 5' to 3' directionality in G4 unfolding by hRPA.
Collapse
Affiliation(s)
- Layal Safa
- Structure des Acides Nucléiques, Télomères et Evolution, Inserm U1154, CNRS UMR 7196, Muséum National d'Histoire Naturelle, 43 rue Cuvier, 75231 Paris cedex 05, France; Université Pierre et Marie Curie, 4 place Jussieu, 75005 Paris, France
| | - Emmanuelle Delagoutte
- Structure des Acides Nucléiques, Télomères et Evolution, Inserm U1154, CNRS UMR 7196, Muséum National d'Histoire Naturelle, 43 rue Cuvier, 75231 Paris cedex 05, France
| | - Irina Petruseva
- Novosibirsk Institute of Bioorganic Chemistry, Siberian Division of Russian Academy of Science, 630090 Novosibirsk, Russia
| | - Patrizia Alberti
- Structure des Acides Nucléiques, Télomères et Evolution, Inserm U1154, CNRS UMR 7196, Muséum National d'Histoire Naturelle, 43 rue Cuvier, 75231 Paris cedex 05, France
| | - Olga Lavrik
- Novosibirsk Institute of Bioorganic Chemistry, Siberian Division of Russian Academy of Science, 630090 Novosibirsk, Russia
| | - Jean-François Riou
- Structure des Acides Nucléiques, Télomères et Evolution, Inserm U1154, CNRS UMR 7196, Muséum National d'Histoire Naturelle, 43 rue Cuvier, 75231 Paris cedex 05, France.
| | - Carole Saintomé
- Structure des Acides Nucléiques, Télomères et Evolution, Inserm U1154, CNRS UMR 7196, Muséum National d'Histoire Naturelle, 43 rue Cuvier, 75231 Paris cedex 05, France; Université Pierre et Marie Curie, 4 place Jussieu, 75005 Paris, France.
| |
Collapse
|
24
|
Agarwal T, Lalwani MK, Kumar S, Roy S, Chakraborty TK, Sivasubbu S, Maiti S. Morphological Effects of G-Quadruplex Stabilization Using a Small Molecule in Zebrafish. Biochemistry 2014; 53:1117-24. [DOI: 10.1021/bi4009352] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tani Agarwal
- CSIR-Institute of Genomics and Integrative
Biology, , Mall Road, New Delhi 110 007, India
| | - Mukesh Kumar Lalwani
- CSIR-Institute of Genomics and Integrative
Biology, , Mall Road, New Delhi 110 007, India
| | - Santosh Kumar
- CSIR-Institute of Genomics and Integrative
Biology, , Mall Road, New Delhi 110 007, India
| | - Saumya Roy
- CSIR-Indian Institute of Chemical
Technology, , Hyderabad 500 007, India
| | - Tushar Kanti Chakraborty
- CSIR-Indian Institute of Chemical
Technology, , Hyderabad 500 007, India
- Department
of Organic Chemistry, Indian Institute of Science, Bangalore 560 012, India
| | - Sridhar Sivasubbu
- CSIR-Institute of Genomics and Integrative
Biology, , Mall Road, New Delhi 110 007, India
| | - Souvik Maiti
- CSIR-Institute of Genomics and Integrative
Biology, , Mall Road, New Delhi 110 007, India
- CSIR-National Chemical Laboratory, Pune 411008, India
| |
Collapse
|
25
|
A highly sensitive label-free sensor for Mercury ion (Hg²⁺) by inhibiting thioflavin T as DNA G-quadruplexes fluorescent inducer. Talanta 2014; 122:85-90. [PMID: 24720966 DOI: 10.1016/j.talanta.2014.01.033] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2013] [Revised: 01/21/2014] [Accepted: 01/23/2014] [Indexed: 11/20/2022]
Abstract
DNA sequences with guanine repeats can be induced to form G-quartets that adopt G-quadruplex structures in the presence of thioflavin T (ThT). ThT plays a dual role of inducing DNA sequences to fold into quadruplex structures and of sensing the change by its remarkable fluorescence enhancement. ThT binding to the DNA sequences with guanine repeats showed highly specific fluorescence enhancement compared with single/double-stranded DNA. In this work, we have utilized the conformational switch from G-quadruplex complex induced by fluorogenic dye ThT to Hg(2+) mediated T-Hg-T double-stranded DNA formation, thereby pioneering a facile approach to detect Hg(2+) with fluorescence spectrometry. Through this approach, Hg(2+) in aqueous solutions can be detected at 5 nM with fluorescence spectrometry in a facile way, with high selectivity against other metal ions. These results indicate the introduced label-free method for fluorescence spectrometric Hg(2+) detection is simple, quantitative, sensitive, and highly selective.
Collapse
|
26
|
Shibata K, Yoshida M, Takahashi T, Takagi M, Shin-ya K, Doi T. Synthesis of Heptaoxazole Macrocyclic Analogues of Telomestatin and Evaluation of Their Telomerase Inhibitory Activities. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2013. [DOI: 10.1246/bcsj.20130198] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Kazuaki Shibata
- Department of Applied Chemistry, Tokyo Institute of Technology
| | | | | | - Motoki Takagi
- Biomedicinal Information Research Center (BIRC), Japan Biological Informatics Consortium (JBIC)
| | - Kazuo Shin-ya
- National Institute of Advanced Industrial Science and Technology (AIST)
| | - Takayuki Doi
- Graduate School of Pharmaceutical Sciences, Tohoku University
| |
Collapse
|
27
|
Shan C, Tan JH, Ou TM, Huang ZS. Natural products and their derivatives as G-quadruplex binding ligands. Sci China Chem 2013. [DOI: 10.1007/s11426-013-4920-y] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
|
28
|
Wang L, Wei C. Spectroscopic and Biological Studies of Phenanthroline Compounds: Selective Recognition of Gene-Promoter G-Quadruplex DNAs Preferred over Duplex DNA. Chem Biodivers 2013; 10:1154-64. [DOI: 10.1002/cbdv.201200341] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2012] [Indexed: 11/06/2022]
|
29
|
Wei CY, Wang JH, Wen Y, Liu J, Wang LH. 4-(1H-Imidazo[4,5-f]-1,10-phenanthrolin-2-yl)phenol-based G-quadruplex DNA binding agents: Telomerase inhibition, cytotoxicity and DNA-binding studies. Bioorg Med Chem 2013; 21:3379-87. [DOI: 10.1016/j.bmc.2012.11.059] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2012] [Revised: 11/26/2012] [Accepted: 11/27/2012] [Indexed: 10/27/2022]
|
30
|
Zhou X, Huang H, Chen Y, Tan J, Song Y, Zou J, Tian X, Hua Y, Ju J. Marthiapeptide A, an anti-infective and cytotoxic polythiazole cyclopeptide from a 60 L scale fermentation of the deep sea-derived Marinactinospora thermotolerans SCSIO 00652. JOURNAL OF NATURAL PRODUCTS 2012; 75:2251-2255. [PMID: 23215246 DOI: 10.1021/np300554f] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
A new sequential tristhiazole-thiazoline-containing cyclic peptide, marthiapeptide A (1), was isolated from a 60 L scale culture of the deep South China Sea-derived strain Marinactinospora thermotolerans SCSIO 00652. The planar structure and absolute configuration of 1 were elucidated by application of spectroscopic techniques, as well as by single-crystal X-ray diffraction and chiral-phase HPLC analysis of the acid hydrolysates. Marthiapeptide A (1) exhibited antibacterial activity against a panel of Gram-positive bacteria, with MIC values ranging from 2.0 to 8.0 μg/mL, and displayed strong cytotoxic activity against a panel of human cancer cell lines with IC(50) values ranging from 0.38 to 0.52 μM.
Collapse
Affiliation(s)
- Xiao Zhou
- CAS Key Laboratory of Marine Bio-resources Sustainable Utilization, RNAM Center for Marine Microbiology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, 164 West Xingang Road, Guangzhou 510301, China
| | | | | | | | | | | | | | | | | |
Collapse
|
31
|
Abstract
In addition to the canonical double helix, DNA can fold into various other inter- and intramolecular secondary structures. Although many such structures were long thought to be in vitro artefacts, bioinformatics demonstrates that DNA sequences capable of forming these structures are conserved throughout evolution, suggesting the existence of non-B-form DNA in vivo. In addition, genes whose products promote formation or resolution of these structures are found in diverse organisms, and a growing body of work suggests that the resolution of DNA secondary structures is critical for genome integrity. This Review focuses on emerging evidence relating to the characteristics of G-quadruplex structures and the possible influence of such structures on genomic stability and cellular processes, such as transcription.
Collapse
|
32
|
Müller S, Sanders DA, Di Antonio M, Matsis S, Riou JF, Rodriguez R, Balasubramanian S. Pyridostatin analogues promote telomere dysfunction and long-term growth inhibition in human cancer cells. Org Biomol Chem 2012; 10:6537-46. [PMID: 22790277 PMCID: PMC3700226 DOI: 10.1039/c2ob25830g] [Citation(s) in RCA: 95] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2012] [Accepted: 06/21/2012] [Indexed: 01/10/2023]
Abstract
The synthesis, biophysical and biological evaluation of a series of G-quadruplex interacting small molecules based on a N,N'-bis(quinolinyl)pyridine-2,6-dicarboxamide scaffold is described. The synthetic analogues were evaluated for their ability to stabilize telomeric G-quadruplex DNA, some of which showed very high stabilization potential associated with high selectivity over double-stranded DNA. The compounds exhibited growth arrest of cancer cells with detectable selectivity over normal cells. Long-time growth arrest was accompanied by senescence, where telomeric dysfunction is a predominant mechanism together with the accumulation of restricted DNA damage sites in the genome. Our data emphasize the potential of a senescence-mediated anticancer therapy through the use of G-quadruplex targeting small molecules based on the molecular framework of pyridostatin.
Collapse
Affiliation(s)
- Sebastian Müller
- Department of Chemistry , University of Cambridge , Lensfield Road , Cambridge , CB2 1EW , UK . ; ; Tel: +44 (0)1223 336347
| | - Deborah A. Sanders
- Department of Chemistry , University of Cambridge , Lensfield Road , Cambridge , CB2 1EW , UK . ; ; Tel: +44 (0)1223 336347
| | - Marco Di Antonio
- Department of Chemistry , University of Cambridge , Lensfield Road , Cambridge , CB2 1EW , UK . ; ; Tel: +44 (0)1223 336347
| | - Stephanos Matsis
- Department of Chemistry , University of Cambridge , Lensfield Road , Cambridge , CB2 1EW , UK . ; ; Tel: +44 (0)1223 336347
| | - Jean-François Riou
- Regulation et Dynamique des Genomes , Museum National d'Histoire Naturelle , INSERM U565 , CNRS UMR 7196 , Paris , France
| | - Raphaël Rodriguez
- Department of Chemistry , University of Cambridge , Lensfield Road , Cambridge , CB2 1EW , UK . ; ; Tel: +44 (0)1223 336347
| | - Shankar Balasubramanian
- Department of Chemistry , University of Cambridge , Lensfield Road , Cambridge , CB2 1EW , UK . ; ; Tel: +44 (0)1223 336347
- Cancer Research UK , Cambridge Research Institute , Li Ka Shing Center , Cambridge , CB2 0RE , UK
- School of Clinical Medicine , University of Cambridge , Cambridge , CB2 0SP , UK
| |
Collapse
|
33
|
Sidibe A, Hamon F, Largy E, Gomez D, Teulade-Fichou MP, Trentesaux C, Riou JF. Effects of a halogenated G-quadruplex ligand from the pyridine dicarboxamide series on the terminal sequence of XpYp telomere in HT1080 cells. Biochimie 2012; 94:2559-68. [PMID: 22796264 DOI: 10.1016/j.biochi.2012.07.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2012] [Accepted: 07/05/2012] [Indexed: 10/28/2022]
Abstract
Non-canonical four-stranded structures called G-quadruplexes can form among telomere repeats during its replication. Small molecule ligands able to interact and to stabilize G-quadruplexes were shown to disrupt the binding of essential telomeric components, such as POT1 and to trigger a telomeric dysfunction associated with a delayed growth arrest in tumor cells. We describe here the chemical synthesis and the G-quadruplex binding properties of three halogenated analogs of the 360A ligand that belongs to the 2,6 pyridine dicarboxamide series. 360A is now commonly used as a benchmark both for biophysical and cellular assays as this compound was shown to display a potent affinity and selectivity for telomeric G-quadruplex DNA over duplex DNA and to induce delayed growth inhibition in HT1080 tumor cell line. Two biophysical assays indicate that, in most cases, the presence of the halogen atom seems to slightly improve the interaction with the telomeric quadruplex. For stability reasons, the bromo derivative (360A-Br) was selected for the cellular assays. Since POT1 participates to the fine tuning of the C-strand end resection during telomere replication, we investigated the effect of 360A-Br to alter the terminal nucleotide composition of XpYp telomere in HT1080 cells using C-STELA. HT1080 cells treated for up to 24 days with 360A-Br presented some minor but significant variations of C-strand terminal nucleotide composition, also observed with a partial siRNA depletion of POT1. The relevance of these minor modifications of the telomeric C-strand resection induced by 360A-Br in HT1080 cells are discussed.
Collapse
|
34
|
Merle P, Evrard B, Petitjean A, Lehn JM, Teulade-Fichou MP, Chautard E, De Cian A, Guittat L, Tran PLT, Mergny JL, Verrelle P, Tchirkov A. Telomere targeting with a new G4 ligand enhances radiation-induced killing of human glioblastoma cells. Mol Cancer Ther 2012; 10:1784-95. [PMID: 21987532 DOI: 10.1158/1535-7163.mct-10-0664] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The aim of this study was to test in vitro the efficacy of TAC, an original G-quadruplex ligand, as a potential radiosensitizing agent for glioblastoma multiforme (GBM). Two human radioresistant telomerase-positive GBM cell lines (SF763 and SF767) were analyzed, with and without TAC treatment, for telomere length, cell proliferation, apoptosis, cell-cycle distribution, gene expression, cytogenetic aberrations, clonogenic survival assay, 53BP1 immunofluorescence staining, and γH2AX phosphorylation. We found that low concentrations of TAC (0.5 and 1 μmol/L) inhibited the proliferation of GBM cells in a concentration-dependent manner after only 1 week of treatment, with minimal effects on cell cycle and apoptosis. TAC treatment had no visible effect on average telomere length but modified expression levels of telomere-related genes (hTERT, TRF1, and TRF2) and induced concentration-dependent DNA damage response and dicentric chromosomes. Survival curves analysis showed that exposure to nontoxic, subapoptotic concentrations of TAC enhanced radiation-induced killing of GBM cells. Analysis of DNA repair after irradiation revealed delayed repair kinetics in GBM cells treated with TAC. Furthermore, the combined treatment (TAC and radiation) significantly increased the frequency of chromosomal aberrations as compared with radiation alone. These findings provide the first evidence that exposure to a G4 ligand radiosensitizes human glioblastoma cells and suggest the prospect of future therapeutic applications.
Collapse
Affiliation(s)
- Patrick Merle
- Laboratoire d’Immunologie, Clermont Université, Université d’Auvergne, Clermont-Ferrand, France
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
35
|
Jain AK, Paul A, Maji B, Muniyappa K, Bhattacharya S. Dimeric 1,3-Phenylene-bis(piperazinyl benzimidazole)s: Synthesis and Structure–Activity Investigations on their Binding with Human Telomeric G-Quadruplex DNA and Telomerase Inhibition Properties. J Med Chem 2012; 55:2981-93. [DOI: 10.1021/jm200860b] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Akash K Jain
- Department
of Organic Chemistry, Indian Institute of Science, Bangalore 560012, India
| | - Ananya Paul
- Department
of Organic Chemistry, Indian Institute of Science, Bangalore 560012, India
| | - Basudeb Maji
- Department
of Organic Chemistry, Indian Institute of Science, Bangalore 560012, India
| | - K. Muniyappa
- Department of Biochemistry, Indian Institute of Science, Bangalore 560012, India
| | - Santanu Bhattacharya
- Department
of Organic Chemistry, Indian Institute of Science, Bangalore 560012, India
- Chemical Biology Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore 560012, India
| |
Collapse
|
36
|
Abstract
G-quartets are square planar arrangements of four guanine bases, which can form extraordinarily stable stacks when present in nucleic acid sequences. Such G-quadruplex structures were long regarded as an in vitro phenomenon, but the widespread presence of suitable sequences in genomes and the identification of proteins that stabilize, modify or resolve these nucleic acid structures have provided circumstantial evidence for their physiological relevance. The therapeutic potential of small molecules that can stabilize or disrupt G-quadruplex structures has invigorated the field in recent years. Here we review some of the key observations that support biological functions for G-quadruplex DNA as well as the techniques and tools that have enabled researchers to probe these structures and their interactions with proteins and small molecules.
Collapse
Affiliation(s)
- Tracy M Bryan
- Children's Medical Research Institute, University of Sydney, 214 Hawkesbury Road, Westmead, Sydney, NSW 2145, Australia.
| | | |
Collapse
|
37
|
Miyazaki T, Pan Y, Joshi K, Purohit D, Hu B, Demir H, Mazumder S, Okabe S, Yamori T, Viapiano M, Shin-ya K, Seimiya H, Nakano I. Telomestatin impairs glioma stem cell survival and growth through the disruption of telomeric G-quadruplex and inhibition of the proto-oncogene, c-Myb. Clin Cancer Res 2012; 18:1268-80. [PMID: 22230766 DOI: 10.1158/1078-0432.ccr-11-1795] [Citation(s) in RCA: 86] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
PURPOSE Glioma stem cells (GSC) are a critical therapeutic target of glioblastoma multiforme (GBM). EXPERIMENTAL DESIGN The effects of a G-quadruplex ligand, telomestatin, were evaluated using patient-derived GSCs, non-stem tumor cells (non-GSC), and normal fetal neural precursors in vitro and in vivo. The molecular targets of telomestatin were determined by immunofluorescence in situ hybridization (iFISH) and cDNA microarray. The data were then validated by in vitro and in vivo functional assays, as well as by immunohistochemistry against 90 clinical samples. RESULTS Telomestatin impaired the maintenance of GSC stem cell state by inducing apoptosis in vitro and in vivo. The migration potential of GSCs was also impaired by telomestatin treatment. In contrast, both normal neural precursors and non-GSCs were relatively resistant to telomestatin. Treatment of GSC-derived mouse intracranial tumors reduced tumor sizes in vivo without a noticeable cell death in normal brains. iFISH revealed both telomeric and non-telomeric DNA damage by telomestatin in GSCs but not in non-GSCs. cDNA microarray identified a proto-oncogene, c-Myb, as a novel molecular target of telomestatin in GSCs, and pharmacodynamic analysis in telomestatin-treated tumor-bearing mouse brains showed a reduction of c-Myb in tumors in vivo. Knockdown of c-Myb phenocopied telomestatin-treated GSCs both in vitro and in vivo, and restoring c-Myb by overexpression partially rescued the phenotype. Finally, c-Myb expression was markedly elevated in surgical specimens of GBMs compared with normal tissues. CONCLUSIONS These data indicate that telomestatin potently eradicates GSCs through telomere disruption and c-Myb inhibition, and this study suggests a novel GSC-directed therapeutic strategy for GBMs.
Collapse
Affiliation(s)
- Takeshi Miyazaki
- Department of Neurological Surgery, Dardinger, Center for Neuro-oncology, James Cancer Hospital and The Ohio State University, Columbus, Ohio 43210, USA
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
38
|
Guittat L, Alberti P, Gomez D, De Cian A, Pennarun G, Lemarteleur T, Belmokhtar C, Paterski R, Morjani H, Trentesaux C, Mandine E, Boussin F, Mailliet P, Lacroix L, Riou JF, Mergny JL. Targeting human telomerase for cancer therapeutics. Cytotechnology 2011; 45:75-90. [PMID: 19003245 DOI: 10.1007/s10616-004-5127-z] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2004] [Accepted: 09/21/2004] [Indexed: 01/28/2023] Open
Abstract
The enzyme telomerase is involved in the replication of telomeres, specialized structures that cap and protect the ends of chromosomes. Its activity is required for maintenance of telomeres and for unlimited lifespan, a hallmark of cancer cells. Telomerase is overexpressed in the vast majority of human cancer cells and therefore represents an attractive target for therapy. Several approaches have been developed to inhibit this enzyme through the targeting of its RNA or catalytic components as well as its DNA substrate, the single-stranded 3'-telomeric overhang. Telomerase inhibitors are chemically diverse and include modified oligonucleotides as well as small diffusable molecules, both natural and synthetic. This review presents an update of recent investigations pertaining to these agents and discusses their biological properties in the context of the initial paradigm that the exposure of cancer cells to these agents should lead to progressive telomere shortening followed by a delayed growth arrest response.
Collapse
Affiliation(s)
- Lionel Guittat
- Laboratoire de Biophysique, Muséum National d'Histoire Naturelle USM503, INSERM U 565, CNRS UMR 5153, 43, rue Cuvier, 75231, Paris cedex 05, France
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
39
|
Romera C, Bombarde O, Bonnet R, Gomez D, Dumy P, Calsou P, Gwan JF, Lin JH, Defrancq E, Pratviel G. Improvement of porphyrins for G-quadruplex DNA targeting. Biochimie 2011; 93:1310-7. [PMID: 21689723 DOI: 10.1016/j.biochi.2011.06.008] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2010] [Accepted: 06/07/2011] [Indexed: 01/17/2023]
Abstract
G-quadruplex nucleic acids are emerging as therapeutic targets for small molecules referred to as small-molecule G-quadruplex ligands. The porphyrin H(2)-TMPyP4 was early reported to be a suitable motif for G-quadruplex DNA recognition. It probably binds to G-quadruplex nucleic acid through π-π stacking with the external G-quartets. We explored chemical modifications of this porphyrin such as insertion of various metal ions in the centre of the aromatic core and addition of bulky substituents that may improve the specificity of the compound toward G-quadruplex DNA. Porphyrin metallation, affording a G4-ligand with two symmetric faces, allowed the conclusion that the presence of an axial water molecule perpendicular to the aromatic plane lowered but did not hamper π-π stacking interactions between the aromatic parts of the ligand on the one hand and the external G-quartet on the other. The charge introduced in the centre of the porphyrin had little influence on binding. Thus, the ionic channel in the centre of G-quadruplex nucleic acids was not found to provide clear additional molecular clues for G-quadruplex nucleic acids targeting by porphyrins tested in the present study. Furthermore, we confirmed the unique G-quadruplex selectivity of a porphyrin modified with four bulky substituents at the meso positions and showed that although the compound is not "drug-like" it was capable of entering cells in culture and mediated some of the typical cellular effects of small-molecule G-quadruplex ligands.
Collapse
Affiliation(s)
- Carmen Romera
- CNRS, Laboratoire de Chimie de Coordination, 205 Route de Narbonne, Toulouse Cedex 4, France
| | | | | | | | | | | | | | | | | | | |
Collapse
|
40
|
Wu WB, Chen SH, Hou JQ, Tan JH, Ou TM, Huang SL, Li D, Gu LQ, Huang ZS. Disubstituted 2-phenyl-benzopyranopyrimidine derivatives as a new type of highly selective ligands for telomeric G-quadruplex DNA. Org Biomol Chem 2011; 9:2975-86. [DOI: 10.1039/c0ob00921k] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
|
41
|
Xu Y. Chemistry in human telomere biology: structure, function and targeting of telomere DNA/RNA. Chem Soc Rev 2011; 40:2719-40. [DOI: 10.1039/c0cs00134a] [Citation(s) in RCA: 249] [Impact Index Per Article: 19.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
|
42
|
Abstract
Advances in chromosome dynamics have increased our understanding of the significant role of telomeres and telomerase in cancer. Telomerase is expressed in almost all cancer cells but is inactive in most normal somatic cells. Therefore, telomerase is an important target for the design of therapeutic agents that might have minimal side effects. Herein, we evaluate current approaches to telomerase/telomere-targeted therapy, discuss the benefits and disadvantages, and speculate on the future direction of telomerase inhibitors as cancer therapeutics.
Collapse
|
43
|
Agarwal T, Roy S, Chakraborty TK, Maiti S. Furan based cyclic homo-oligopeptides bind G-quadruplex selectively and repress c-MYC transcription. Bioorg Med Chem Lett 2010; 20:4346-9. [DOI: 10.1016/j.bmcl.2010.06.080] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2010] [Revised: 05/24/2010] [Accepted: 06/14/2010] [Indexed: 12/01/2022]
|
44
|
Ghosh S, Majumder P, Pradhan SK, Dasgupta D. Mechanism of interaction of small transcription inhibitors with DNA in the context of chromatin and telomere. BIOCHIMICA ET BIOPHYSICA ACTA-GENE REGULATORY MECHANISMS 2010; 1799:795-809. [PMID: 20638489 DOI: 10.1016/j.bbagrm.2010.06.008] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2010] [Revised: 06/23/2010] [Accepted: 06/30/2010] [Indexed: 01/13/2023]
Abstract
Small molecules from natural and synthetic sources have long been employed as human drugs. The transcription inhibitory potential of one class of these molecules has paved their use as anticancer drugs. The principal mode of action of these molecules is via reversible interaction with genomic DNA, double and multiple stranded. In this article we have revisited the mechanism of the interaction in the context of chromatin and telomere. The established modes of association of these molecules with double helical DNA provide a preliminary mechanism of their transcription inhibitory potential, but the scenario assumes a different dimension when the genomic DNA is associated with proteins in the transcription apparatus of both prokaryotic and eukaryotic organisms. We have discussed this altered scenario as a prelude to understand the chemical biology of their action in the cell. For the telomeric quadruplex DNA, we have reviewed the mechanism of their association with the quadruplex and resultant cellular consequence.
Collapse
Affiliation(s)
- Saptaparni Ghosh
- Biophysics Division, Saha Institute of Nuclear Physics, Sector-I, Block-AF, Bidhan Nagar, Kolkata Pin, 700064, India
| | | | | | | |
Collapse
|
45
|
Paeschke K, McDonald KR, Zakian VA. Telomeres: structures in need of unwinding. FEBS Lett 2010; 584:3760-72. [PMID: 20637196 DOI: 10.1016/j.febslet.2010.07.007] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2010] [Revised: 06/25/2010] [Accepted: 07/02/2010] [Indexed: 11/26/2022]
Abstract
Telomeres protect the ends of eukaryotic chromosomes from being recognized and processed as double strand breaks. In most organisms, telomeric DNA is highly repetitive with a high GC-content. Moreover, the G residues are concentrated in the strand running 3'-5' from the end of the chromosome towards its center. This G-rich strand is extended to form a 3' single-stranded tail that can form unusual secondary structures such as T-loops and G-quadruplex DNA. Both the duplex repeats and the single-stranded G-tail are assembled into stable protein-DNA complexes. The unique architecture, high GC content, and multi-protein association create particularly stable protein-DNA complexes that are a challenge for replication, recombination, and transcription. Helicases utilize the energy of nucleotide hydrolysis to unwind base paired nucleic acids and, in some cases, to displace proteins from them. The telomeric functions of helicases from the RecQ, Pifl, FANCJ, and DNA2 families are reviewed in this article. We summarize data showing that perturbation of their telomere activities can lead to telomere dysfunction and genome instability and in some cases human disease.
Collapse
Affiliation(s)
- Katrin Paeschke
- Department of Molecular Biology, Princeton University, Princeton, NJ 08544, USA
| | | | | |
Collapse
|
46
|
Kong DM, Cai LL, Guo JH, Wu J, Shen HX. Characterization of the G-quadruplex structure of a catalytic DNA with peroxidase activity. Biopolymers 2010; 91:331-9. [PMID: 19137574 DOI: 10.1002/bip.21135] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
It has been reported that the complexes formed by hemin and some G-quadruplexes can be developed as a new class of DNAzyme with peroxidase activity. This kind of DNAzyme has received a great deal of attention. But to date, the actual G-quadruplex structure that can provide hemin with enhanced peroxidase activity is in doubt. Herein, the G-quadruplex structure of CatG4, a 21-nucleotide DNA oligomer which was previously reported to bind hemin and the resulting complex exhibiting enhanced peroxidase activity, was characterized by fluorescence and circular dichroism measurements. The results suggest that the catalytically active form of CatG4 may be a unimolecular parallel quadruplex rather than a unimolecular chair-type antiparallel quadruplex or a multistranded parallel quadruplex. In addition, the fluorescence analysis of labeled oligonucleotides may be developed as a supplementary tool for the study of DNA conformations.
Collapse
Affiliation(s)
- De-Ming Kong
- Key Laboratory of Functional Polymer Materials (Nankai University), Ministry of Education, Department of Chemistry, Research Centre for Analytical Sciences, Nankai University, Tianjin 300071, People's Republic of China.
| | | | | | | | | |
Collapse
|
47
|
Abstract
A simple thermal melting experiment may be used to demonstrate the stabilization of a given structure by a ligand (usually a small molecule, sometimes a peptide). Preparation of the sample is straightforward, and the experiment itself requires an inexpensive apparatus. Furthermore, reasonably low amounts of sample are required. A qualitative analysis of the data is simple: An increase in the melting temperature (T(m)) indicates preferential binding to the folded form as compared to the unfolded form. However, it is perilous to derive an affinity constant from an increase in T(m) as other factors play a role.
Collapse
Affiliation(s)
- Aurore Guédin
- Equipe Santé, Laboratoire Régulation et Dynamique des Génomes, Muséum National d'Histoire Naturelle USM 503, INSERM UR 565, CNRS UMR 5153, Paris, France
| | | | | |
Collapse
|
48
|
Yaku H, Murashima T, Miyoshi D, Sugimoto N. Anionic phthalocyanines targeting G-quadruplexes and inhibiting telomerase activity in the presence of excessive DNA duplexes. Chem Commun (Camb) 2010; 46:5740-2. [DOI: 10.1039/c0cc00956c] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
|
49
|
Abstract
G-quartets are square planar arrangements of four guanine bases, which can form extraordinarily stable stacks when present in nucleic acid sequences. Such G-quadruplex structures were long regarded as an in vitro phenomenon, but the widespread presence of suitable sequences in genomes and the identification of proteins that stabilize, modify, or resolve these nucleic acid structures have provided circumstantial evidence for their physiological relevance. The therapeutic potential of small molecules that can stabilize or disrupt G-quadruplex structures has invigorated the field in recent years. Here we review some of the key observations that support biological functions for G-quadruplex DNA as well as the techniques and tools that have enabled researchers to probe these structures and their interactions with proteins and small molecules.
Collapse
Affiliation(s)
- Tracy M Bryan
- Children's Medical Research Institute and the University of Sydney, Sydney, Australia
| | | |
Collapse
|
50
|
Arnoult N, Saintome C, Ourliac-Garnier I, Riou JF, Londoño-Vallejo A. Human POT1 is required for efficient telomere C-rich strand replication in the absence of WRN. Genes Dev 2009; 23:2915-24. [PMID: 20008939 DOI: 10.1101/gad.544009] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Mechanisms of telomere replication remain poorly defined. It has been suggested that G-rich telomeric strand replication by lagging mechanisms requires, in a stochastic way, the WRN protein. Here we show that this requirement is more systematic than previously thought. Our data are compatible with a situation in which, in the absence of WRN, DNA synthesis at replication forks is uncoupled, thus allowing replication to continue on the C strand, while single G strands accumulate. We also show that in cells in which both WRN and POT1 are limiting, both G- and C-rich telomeric strands shorten, suggesting a complete replication block. Under this particular condition, expression of a fragment spanning the two POT1-OB (oligonucleotide-binding) fold domains is able to restore C (but not G) strand replication, suggesting that binding of POT1 to the lagging strand allows DNA synthesis uncoupling in the absence of WRN. Furthermore, in vitro experiments indicate that purified POT1 has a higher affinity for the telomeric G-rich strand than purified RPA. We propose a model in which the relative enrichments of POT1 versus RPA on the telomeric lagging strand allows or does not allow uncoupling of DNA synthesis at the replication fork. Our study reveals an unanticipated role for hPOT1 during telomere replication.
Collapse
Affiliation(s)
- Nausica Arnoult
- Telomeres and Cancer Laboratory, Institut Curie, Paris 75248, France
| | | | | | | | | |
Collapse
|