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Lam PL, Lee KKH, Wong RSM, Cheng GYM, Bian ZX, Chui CH, Gambari R. Recent advances on topical antimicrobials for skin and soft tissue infections and their safety concerns. Crit Rev Microbiol 2018; 44:40-78. [PMID: 28423970 DOI: 10.1080/1040841x.2017.1313811] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Antimicrobial resistance of disease-related microorganisms is considered a worldwide prevalent and serious issue which increases the failure of treatment outcomes and leads to high mortality. Considering that the increased resistance to systemic antimicrobial therapy often needs of the use of more toxic agents, topical antimicrobial therapy emerges as an attractive route for the treatment of infectious diseases. The topical antimicrobial therapy is based on the absorption of high drug doses in a readily accessible skin surface, resulting in a reduction of microbial proliferation at infected skin sites. Topical antimicrobials retain the following features: (a) they are able to escape the enzymatic degradation and rapid clearance in the gastrointestinal tract or the first-pass metabolism during oral administration; (b) alleviate the physical discomfort related to intravenous injection; (c) reduce possible adverse effects and drug interactions of systemic administrations; (d) increase patient compliance and convenience; and (e) reduce the treatment costs. Novel antimicrobials for topical application have been widely exploited to control the emergence of drug-resistant microorganisms. This review provides a description of antimicrobial resistance, common microorganisms causing skin and soft tissue infections, topical delivery route of antimicrobials, safety concerns of topical antimicrobials, recent advances, challenges and future prospective in topical antimicrobial development.
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Affiliation(s)
- P L Lam
- a Department of Applied Biology and Chemical Technology, State Key Laboratory of Chirosciences , The Hong Kong Polytechnic University , Hong Kong , P.R. China
| | - K K H Lee
- b Department of Medicine and Therapeutics, School of Biomedical Sciences, MOE Key Laboratory for Regenerative Medicine , The Chinese University of Hong Kong , Hong Kong , P.R. China
| | - R S M Wong
- b Department of Medicine and Therapeutics, School of Biomedical Sciences, MOE Key Laboratory for Regenerative Medicine , The Chinese University of Hong Kong , Hong Kong , P.R. China
| | - G Y M Cheng
- c Faculty of Health Sciences , University of Macau , Macau , P.R. China
| | - Z X Bian
- d Clinical Division, School of Chinese Medicine , Hong Kong Baptist University , Hong Kong , P.R. China
| | - C H Chui
- a Department of Applied Biology and Chemical Technology, State Key Laboratory of Chirosciences , The Hong Kong Polytechnic University , Hong Kong , P.R. China
- d Clinical Division, School of Chinese Medicine , Hong Kong Baptist University , Hong Kong , P.R. China
| | - R Gambari
- e Department of Life Sciences and Biotechnology, Centre of Biotechnology , University of Ferrara , Ferrara , Italy
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52
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Mårtensson AKF, Bergentall M, Tremaroli V, Lincoln P. Diastereomeric bactericidal effect of Ru(phenanthroline) 2 dipyridophenazine. Chirality 2018; 28:713-720. [PMID: 27791316 PMCID: PMC5248623 DOI: 10.1002/chir.22656] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2016] [Revised: 06/05/2016] [Accepted: 09/21/2016] [Indexed: 01/30/2023]
Abstract
Metal susceptibility assays and spot plating were used to investigate the antimicrobial activity of enantiopure [Ru(phen)2 dppz]2+ (phen =1,10-phenanthroline and dppz = dipyrido[3,2-a:2´,3´-c]phenazine) and [μ-bidppz(phen)4 Ru2 ]4+ (bidppz =11,11´-bis(dipyrido[3,2-a:2´,3´-c]phenazinyl)), on Gram-negative Escherichia coli and Gram-positive Bacillus subtilis as bacterial models. The minimum inhibitory concentrations (MIC) and minimum bactericidal concentrations (MBC) were determined for both complexes: while [μ-bidppz(phen)4 Ru2 ]4+ only showed a bactericidal effect at the highest concentrations tested, the antimicrobial activity of [Ru(phen)2 dppz]2+ against B. subtilis was comparable to that of tetracyline. In addition, the Δ-enantiomer of [Ru(phen)2 dppz]2+ showed a 2-fold higher bacteriostatic and bactericidal effect compared to the Λ-enantiomer. This was in accordance with the enantiomers relative binding affinity for DNA, thus strongly indicating DNA binding as the mode of action.
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Affiliation(s)
- Anna K F Mårtensson
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Gothenburg, Sweden.
| | - Mattias Bergentall
- Wallenberg Laboratory and Sahlgrenska Center for Cardiovascular and Metabolic Research, Department of Molecular and Clinical Medicine, Institute of Medicine, University of Gothenburg, Gothenburg, Sweden
| | - Valentina Tremaroli
- Wallenberg Laboratory and Sahlgrenska Center for Cardiovascular and Metabolic Research, Department of Molecular and Clinical Medicine, Institute of Medicine, University of Gothenburg, Gothenburg, Sweden
| | - Per Lincoln
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Gothenburg, Sweden
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Sundaraneedi MK, Tedla BA, Eichenberger RM, Becker L, Pickering D, Smout MJ, Rajan S, Wangchuk P, Keene FR, Loukas A, Collins JG, Pearson MS. Polypyridylruthenium(II) complexes exert anti-schistosome activity and inhibit parasite acetylcholinesterases. PLoS Negl Trop Dis 2017; 11:e0006134. [PMID: 29240773 PMCID: PMC5746282 DOI: 10.1371/journal.pntd.0006134] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2017] [Revised: 12/28/2017] [Accepted: 11/23/2017] [Indexed: 12/22/2022] Open
Abstract
BACKGROUND Schistosomiasis affects over 200 million people and there are concerns whether the current chemotherapeutic control strategy (periodic mass drug administration with praziquantel (PZQ)-the only licenced anti-schistosome compound) is sustainable, necessitating the development of new drugs. METHODOLOGY/PRINCIPAL FINDINGS We investigated the anti-schistosome efficacy of polypyridylruthenium(II) complexes and showed they were active against all intra-mammalian stages of S. mansoni. Two compounds, Rubb12-tri and Rubb7-tnl, which were among the most potent in their ability to kill schistosomula and adult worms and inhibit egg hatching in vitro, were assessed for their efficacy in a mouse model of schistosomiasis using 5 consecutive daily i.v. doses of 2 mg/kg (Rubb12-tri) and 10 mg/kg (Rubb7-tnl). Mice treated with Rubb12-tri showed an average 42% reduction (P = 0.009), over two independent trials, in adult worm burden. Liver egg burdens were not significantly decreased in either drug-treated group but ova from both of these groups showed significant decreases in hatching ability (Rubb12-tri-68%, Rubb7-tnl-56%) and were significantly morphologically altered (Rubb12-tri-62% abnormal, Rubb7-tnl-35% abnormal). We hypothesize that the drugs exerted their activity, at least partially, through inhibition of both neuronal and tegumental acetylcholinesterases (AChEs), as worms treated in vitro showed significant decreases in activity of these enzymes. Further, treated parasites exhibited a significantly decreased ability to uptake glucose, significantly depleted glycogen stores and withered tubercules (a site of glycogen storage), implying drug-mediated interference in this nutrient acquisition pathway. CONCLUSIONS/SIGNIFICANCE Our data provide compelling evidence that ruthenium complexes are effective against all intra-mammalian stages of schistosomes, including schistosomula (refractory to PZQ) and eggs (agents of disease transmissibility). Further, the results of this study suggest that schistosome AChE is a target of ruthenium drugs, a finding that can inform modification of current compounds to identify analogues which are even more effective and selective against schistosomes.
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Affiliation(s)
- Madhu K. Sundaraneedi
- School of Physical, Environmental and Mathematical Sciences, UNSW Canberra, Canberra, Australian Capital Territory, Australia
| | - Bemnet A. Tedla
- Centre for Biodiscovery and Molecular Development of Therapeutics, Australian Institute of Tropical Health and Medicine, James Cook University, Cairns, Queensland, Australia
| | - Ramon M. Eichenberger
- Centre for Biodiscovery and Molecular Development of Therapeutics, Australian Institute of Tropical Health and Medicine, James Cook University, Cairns, Queensland, Australia
| | - Luke Becker
- Centre for Biodiscovery and Molecular Development of Therapeutics, Australian Institute of Tropical Health and Medicine, James Cook University, Cairns, Queensland, Australia
| | - Darren Pickering
- Centre for Biodiscovery and Molecular Development of Therapeutics, Australian Institute of Tropical Health and Medicine, James Cook University, Cairns, Queensland, Australia
| | - Michael J. Smout
- Centre for Biodiscovery and Molecular Development of Therapeutics, Australian Institute of Tropical Health and Medicine, James Cook University, Cairns, Queensland, Australia
| | - Siji Rajan
- School of Physical, Environmental and Mathematical Sciences, UNSW Canberra, Canberra, Australian Capital Territory, Australia
| | - Phurpa Wangchuk
- Centre for Biodiscovery and Molecular Development of Therapeutics, Australian Institute of Tropical Health and Medicine, James Cook University, Cairns, Queensland, Australia
| | - F. Richard Keene
- Centre for Biodiscovery and Molecular Development of Therapeutics, Australian Institute of Tropical Health and Medicine, James Cook University, Cairns, Queensland, Australia
- School of Physical Sciences, University of Adelaide, Adelaide, South Australia, Australia
| | - Alex Loukas
- Centre for Biodiscovery and Molecular Development of Therapeutics, Australian Institute of Tropical Health and Medicine, James Cook University, Cairns, Queensland, Australia
| | - J. Grant Collins
- School of Physical, Environmental and Mathematical Sciences, UNSW Canberra, Canberra, Australian Capital Territory, Australia
| | - Mark S. Pearson
- Centre for Biodiscovery and Molecular Development of Therapeutics, Australian Institute of Tropical Health and Medicine, James Cook University, Cairns, Queensland, Australia
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Sundaraneedi M, Eichenberger RM, Al-Hallaf R, Yang D, Sotillo J, Rajan S, Wangchuk P, Giacomin PR, Keene FR, Loukas A, Collins JG, Pearson MS. Polypyridylruthenium(II) complexes exert in vitro and in vivo nematocidal activity and show significant inhibition of parasite acetylcholinesterases. INTERNATIONAL JOURNAL FOR PARASITOLOGY-DRUGS AND DRUG RESISTANCE 2017; 8:1-7. [PMID: 29207309 PMCID: PMC5724747 DOI: 10.1016/j.ijpddr.2017.11.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Revised: 11/23/2017] [Accepted: 11/27/2017] [Indexed: 12/28/2022]
Abstract
Over 4.5 billion people are at risk of infection with soil transmitted helminths and there are concerns about the development of resistance to the handful of frontline nematocides in endemic populations. We investigated the anti-nematode efficacy of a series of polypyridylruthenium(II) complexes and showed they were active against L3 and adult stages of Trichuris muris, the rodent homologue of the causative agent of human trichuriasis, T. trichiura. One of the compounds, Rubb12-mono, which was among the most potent in its ability to kill L3 (IC50 = 3.1 ± 0.4 μM) and adult (IC50 = 5.2 ± 0.3 μM) stage worms was assessed for efficacy in a mouse model of trichuriasis by administering 3 consecutive daily oral doses of the drug 3 weeks post infection with the murine whipworm Trichuris muris. Mice treated with Rubb12-mono showed an average 66% reduction (P = 0.015) in faecal egg count over two independent trials. The drugs partially exerted their activity through inhibition of acetylcholinesterases, as worms treated in vitro and in vivo showed significant decreases in the activity of this class of enzymes. Our data show that ruthenium complexes are effective against T. muris, a model gastro-intestinal nematode and soil-transmitted helminth. Further, knowledge of the target of ruthenium drugs can facilitate modification of current compounds to identify analogues which are even more effective and selective against Trichuris and other helminths of human and veterinary importance. The effect of ruthenium complexes on Trichuris muris parasites were investigated. The drugs killed L3 and adult worms in vitro at low micromolar concentrations. The compounds partially exerted activity through acetylcholinesterase inhibition. When given to infected mice, Rubb12-mono significantly reduced parasite burden.
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Affiliation(s)
- Madhu Sundaraneedi
- School of Physical, Environmental and Mathematical Sciences, UNSW (ADFA), Canberra, Australian Capital Territory, 2612, Australia
| | - Ramon M Eichenberger
- Centre for Biodiscovery and Molecular Development of Therapeutics, Australian Institute of Tropical Health and Medicine, James Cook University, Cairns, Queensland, 4878, Australia
| | - Rafid Al-Hallaf
- Centre for Biodiscovery and Molecular Development of Therapeutics, Australian Institute of Tropical Health and Medicine, James Cook University, Cairns, Queensland, 4878, Australia
| | - Dai Yang
- Centre for Biodiscovery and Molecular Development of Therapeutics, Australian Institute of Tropical Health and Medicine, James Cook University, Cairns, Queensland, 4878, Australia
| | - Javier Sotillo
- Centre for Biodiscovery and Molecular Development of Therapeutics, Australian Institute of Tropical Health and Medicine, James Cook University, Cairns, Queensland, 4878, Australia
| | - Siji Rajan
- School of Physical, Environmental and Mathematical Sciences, UNSW (ADFA), Canberra, Australian Capital Territory, 2612, Australia
| | - Phurpa Wangchuk
- Centre for Biodiscovery and Molecular Development of Therapeutics, Australian Institute of Tropical Health and Medicine, James Cook University, Cairns, Queensland, 4878, Australia
| | - Paul R Giacomin
- Centre for Biodiscovery and Molecular Development of Therapeutics, Australian Institute of Tropical Health and Medicine, James Cook University, Cairns, Queensland, 4878, Australia
| | - F Richard Keene
- Centre for Biodiscovery and Molecular Development of Therapeutics, Australian Institute of Tropical Health and Medicine, James Cook University, Cairns, Queensland, 4878, Australia; School of Physical Sciences, University of Adelaide, Adelaide, South Australia, 5005, Australia
| | - Alex Loukas
- Centre for Biodiscovery and Molecular Development of Therapeutics, Australian Institute of Tropical Health and Medicine, James Cook University, Cairns, Queensland, 4878, Australia
| | - J Grant Collins
- School of Physical, Environmental and Mathematical Sciences, UNSW (ADFA), Canberra, Australian Capital Territory, 2612, Australia
| | - Mark S Pearson
- Centre for Biodiscovery and Molecular Development of Therapeutics, Australian Institute of Tropical Health and Medicine, James Cook University, Cairns, Queensland, 4878, Australia.
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55
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Bilal M, Rasheed T, Iqbal HMN, Hu H, Wang W, Zhang X. Macromolecular agents with antimicrobial potentialities: A drive to combat antimicrobial resistance. Int J Biol Macromol 2017; 103:554-574. [PMID: 28528940 DOI: 10.1016/j.ijbiomac.2017.05.071] [Citation(s) in RCA: 55] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2017] [Revised: 04/23/2017] [Accepted: 05/15/2017] [Indexed: 02/08/2023]
Abstract
In recent years, the antimicrobial resistance (AMR) or multidrug resistance (MDR) has become a serious health concern and major challenging issue, worldwide. After decades of negligence, the AMR has now captured global attention. The increasing number of antibiotic-resistant strains has threatened the achievements of science and medicine since it inactivates conventional antimicrobial therapeutics. Scientists are trying to respond to AMR/MDR threat by exploring innovative platforms and new therapeutic strategies to tackle infections from these resistant strains and bypass treatment limitations related to these pathologies. The present review focuses on the utilization of bio-inspired novel constructs and their potential applications as novel antimicrobial agents. The first part of the review describes plant-based biological macromolecules containing an immense variety of secondary metabolites, which could be potentially used as alternative strategies to combat antimicrobial resistance. The second part discusses the potential of metal-based macromolecules as effective antimicrobial platforms for preventing infections from resistant strains. The third part comprehensively elucidates how nanoparticles, in particular, metal-integrated nanoparticles can overcome this AMR or MDR issue. Towards the end, information is given with critical concluding remarks, gaps, and finally envisioned with future considerations.
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Affiliation(s)
- Muhammad Bilal
- State Key Laboratory of Microbial Metabolism, and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240, China.
| | - Tahir Rasheed
- The School of Chemistry & Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Hafiz M N Iqbal
- School of Engineering and Science, Tecnologico de Monterrey, Campus Monterrey, Ave. Eugenio Garza Sada 2501, Monterrey, N.L., CP 64849, Mexico.
| | - Hongbo Hu
- State Key Laboratory of Microbial Metabolism, and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Wei Wang
- State Key Laboratory of Microbial Metabolism, and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Xuehong Zhang
- State Key Laboratory of Microbial Metabolism, and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240, China
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Zheng Y, Liu W, Chen Y, Jiang H, Yan H, Kosenko I, Chekulaeva L, Sivaev I, Bregadze V, Wang X. A Highly Potent Antibacterial Agent Targeting Methicillin-Resistant Staphylococcus aureus Based on Cobalt Bis(1,2-Dicarbollide) Alkoxy Derivative. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00426] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Youkun Zheng
- State
Key Laboratory of Bioelectronics, National Demonstration Center for
Experimental Biomedical Engineering Education, School of Biological
Science and Medical Engineering, Southeast University, Nanjing 210096, China
| | - Weiwei Liu
- State
Key Laboratory of Bioelectronics, National Demonstration Center for
Experimental Biomedical Engineering Education, School of Biological
Science and Medical Engineering, Southeast University, Nanjing 210096, China
| | - Yun Chen
- State
Key Laboratory of Bioelectronics, National Demonstration Center for
Experimental Biomedical Engineering Education, School of Biological
Science and Medical Engineering, Southeast University, Nanjing 210096, China
| | - Hui Jiang
- State
Key Laboratory of Bioelectronics, National Demonstration Center for
Experimental Biomedical Engineering Education, School of Biological
Science and Medical Engineering, Southeast University, Nanjing 210096, China
| | - Hong Yan
- State
Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing 210093, China
| | - Irina Kosenko
- A.N.
Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilov Str. 28, Moscow 119991, Russia
| | - Lubov Chekulaeva
- A.N.
Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilov Str. 28, Moscow 119991, Russia
| | - Igor Sivaev
- A.N.
Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilov Str. 28, Moscow 119991, Russia
| | - Vladimir Bregadze
- A.N.
Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilov Str. 28, Moscow 119991, Russia
| | - Xuemei Wang
- State
Key Laboratory of Bioelectronics, National Demonstration Center for
Experimental Biomedical Engineering Education, School of Biological
Science and Medical Engineering, Southeast University, Nanjing 210096, China
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57
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Gorle AK, Bottomley AL, Harry EJ, Collins JG, Keene FR, Woodward CE. DNA condensation in live E. coli provides evidence for transertion. MOLECULAR BIOSYSTEMS 2017; 13:677-680. [PMID: 28232991 DOI: 10.1039/c6mb00753h] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Condensation studies of chromosomal DNA in E. coli with a tetranuclear ruthenium complex are carried out and images obtained with wide-field fluorescence microscopy. Remarkably different condensate morphologies resulted, depending upon the treatment protocol. The occurrence of condensed nucleoid spirals in live bacteria provides evidence for the transertion hypothesis.
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Affiliation(s)
- Anil K Gorle
- School of Physical, Environmental and Mathematical Sciences, University of New South Wales, Australian Defence Force Academy, Canberra, ACT 2600, Australia.
| | - Amy L Bottomley
- The ithree institute, University of Technology Sydney, PO Box 123, Broadway, NSW 2007, Australia
| | - Elizabeth J Harry
- The ithree institute, University of Technology Sydney, PO Box 123, Broadway, NSW 2007, Australia
| | - J Grant Collins
- School of Physical, Environmental and Mathematical Sciences, University of New South Wales, Australian Defence Force Academy, Canberra, ACT 2600, Australia.
| | - F Richard Keene
- Centre for Biodiscovery & Molecular Development of Therapeutics, James Cook University, Townsville, QLD 4811, Australia and School of Physical Sciences, University of Adelaide, Adelaide, SA 5066, Australia.
| | - Clifford E Woodward
- School of Physical, Environmental and Mathematical Sciences, University of New South Wales, Australian Defence Force Academy, Canberra, ACT 2600, Australia.
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58
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Synthesis of 4′-substituted-2,2′;6′,2″-terpyridine Ru(II) complexes electrochemical, fluorescence quenching and antibacterial studies. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2016.12.102] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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Saeed HK, Saeed IQ, Buurma NJ, Thomas JA. The Structure of Linkers Affects the DNA Binding Properties of Tethered Dinuclear Ruthenium(II) Metallo-Intercalators. Chemistry 2017; 23:5467-5477. [PMID: 28072487 DOI: 10.1002/chem.201605750] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2016] [Indexed: 12/12/2022]
Abstract
With the long-term aim of enhancing the binding properties of dinuclear RuII -based DNA light-switch complexes, a series of eight structurally related mono- and dinuclear systems are reported in which the linker of the bridging ligand has been modulated. These tethered systems have been designed to explore issues of steric demand at the binding site and the thermodynamic cost of entropy loss upon binding. Detailed spectroscopic and isothermal titration calorimetry (ITC) studies on the new complexes reveal that one of the linkers produces a dinuclear system that binds to duplex DNA with an affinity (Kb >107 m-1 ) that is higher than its corresponding monometallic complex and is the highest affinity for a non-threading bis-intercalating metal complex. These studies confirm that the tether has a major effect on the binding properties of dinuclear complexes containing intercalating units and establishes key design rules for the construction of dinuclear complexes with enhanced DNA binding characteristics.
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Affiliation(s)
- Hiwa K Saeed
- Department of Chemistry, University of Sheffield, Sheffield, S3 7HF, UK
| | - Ibrahim Q Saeed
- Physical Organic Chemistry Centre, School of Chemistry, Cardiff University, Main Building Park Place, Cardiff, CF10 3AT, UK
| | - Niklaas J Buurma
- Physical Organic Chemistry Centre, School of Chemistry, Cardiff University, Main Building Park Place, Cardiff, CF10 3AT, UK
| | - Jim A Thomas
- Department of Chemistry, University of Sheffield, Sheffield, S3 7HF, UK
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60
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Abd-El-Aziz AS, Agatemor C, Etkin N. Antimicrobial resistance challenged with metal-based antimicrobial macromolecules. Biomaterials 2017; 118:27-50. [DOI: 10.1016/j.biomaterials.2016.12.002] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2016] [Revised: 11/30/2016] [Accepted: 12/02/2016] [Indexed: 12/24/2022]
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61
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Abstract
Ruthenium is seldom mentioned in microbiology texts, due to the fact that this metal has no known, essential roles in biological systems, nor is it generally considered toxic. Since the fortuitous discovery of cisplatin, first as an antimicrobial agent and then later employed widely as an anticancer agent, complexes of other platinum group metals, such as ruthenium, have attracted interest for their medicinal properties. Here, we review at length how ruthenium complexes have been investigated as potential antimicrobial, antiparasitic and chemotherapeutic agents, in addition to their long and well-established roles as biological stains and inhibitors of calcium channels. Ruthenium complexes are also employed in a surprising number of biotechnological roles. It is in the employment of ruthenium complexes as antimicrobial agents and alternatives or adjuvants to more traditional antibiotics, that we expect to see the most striking developments in the future. Such novel contributions from organometallic chemistry are undoubtedly sorely needed to address the antimicrobial resistance crisis and the slow appearance on the market of new antibiotics.
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62
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Smith NA, Zhang P, Greenough SE, Horbury MD, Clarkson GJ, McFeely D, Habtemariam A, Salassa L, Stavros VG, Dowson CG, Sadler PJ. Combatting AMR: photoactivatable ruthenium(ii)-isoniazid complex exhibits rapid selective antimycobacterial activity. Chem Sci 2017; 8:395-404. [PMID: 28451184 PMCID: PMC5365061 DOI: 10.1039/c6sc03028a] [Citation(s) in RCA: 84] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2016] [Accepted: 08/11/2016] [Indexed: 12/12/2022] Open
Abstract
The novel photoactive ruthenium(ii) complex cis-[Ru(bpy)2(INH)2][PF6]2 (1·2PF6, INH = isoniazid) was designed to incorporate the anti-tuberculosis drug, isoniazid, that could be released from the Ru(ii) cage by photoactivation with visible light. In aqueous solution, 1 rapidly released two equivalents of isoniazid and formed the photoproduct cis-[Ru(bpy)2(H2O)2]2+ upon irradiation with 465 nm blue light. We screened for activity against bacteria containing the three major classes of cell envelope: Gram-positive Bacillus subtilis, Gram-negative Escherichia coli, and Mycobacterium smegmatis in vitro using blue and multi-colored LED multi-well arrays. Complex 1 is inactive in the dark, but when photoactivated is 5.5× more potent towards M. smegmatis compared to the clinical drug isoniazid alone. Complementary pump-probe spectroscopy measurements along with density functional theory calculations reveal that the mono-aqua product is formed in <500 ps, likely facilitated by a 3MC state. Importantly, complex 1 is highly selective in killing mycobacteria versus normal human cells, towards which it is relatively non-toxic. This work suggests that photoactivatable prodrugs such as 1 are potentially powerful new agents in combatting the global problem of antibiotic resistance.
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Affiliation(s)
- Nichola A Smith
- Department of Chemistry , University of Warwick , Gibbet Hill Road , Coventry CV4 7AL , UK .
| | - Pingyu Zhang
- Department of Chemistry , University of Warwick , Gibbet Hill Road , Coventry CV4 7AL , UK .
| | - Simon E Greenough
- Department of Chemistry , University of Warwick , Gibbet Hill Road , Coventry CV4 7AL , UK .
| | - Michael D Horbury
- Department of Chemistry , University of Warwick , Gibbet Hill Road , Coventry CV4 7AL , UK .
| | - Guy J Clarkson
- Department of Chemistry , University of Warwick , Gibbet Hill Road , Coventry CV4 7AL , UK .
| | - Daniel McFeely
- School of Life Sciences , University of Warwick , Gibbet Hill Road , Coventry CV4 7AL , UK .
| | - Abraha Habtemariam
- Department of Chemistry , University of Warwick , Gibbet Hill Road , Coventry CV4 7AL , UK .
| | - Luca Salassa
- CIC biomaGUNE , Paseo de Miramón 182 , Donostia-San Sebastián , 20009 , Spain
- Kimika Fakultatea , Euskal Herriko Unibertsitatea and Donostia International Physics Center (DIPC) , P.K. 1072 , Donostia-San Sebastián , 20080 , Spain
- Ikerbasque , Basque Foundation for Science , Bilbao , 48011 , Spain
| | - Vasilios G Stavros
- Department of Chemistry , University of Warwick , Gibbet Hill Road , Coventry CV4 7AL , UK .
| | - Christopher G Dowson
- School of Life Sciences , University of Warwick , Gibbet Hill Road , Coventry CV4 7AL , UK .
| | - Peter J Sadler
- Department of Chemistry , University of Warwick , Gibbet Hill Road , Coventry CV4 7AL , UK .
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63
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Notaro A, Gasser G. Monomeric and dimeric coordinatively saturated and substitutionally inert Ru(ii) polypyridyl complexes as anticancer drug candidates. Chem Soc Rev 2017; 46:7317-7337. [DOI: 10.1039/c7cs00356k] [Citation(s) in RCA: 148] [Impact Index Per Article: 21.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Monomeric and dimeric coordinatively saturated and substitutionally inert Ru(ii) polypyridyl complexes with anticancer properties are reviewed.
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Affiliation(s)
- Anna Notaro
- Chimie ParisTech
- PSL Research University
- Laboratory for Inorganic Chemical Biology
- F-75005 Paris
- France
| | - Gilles Gasser
- Chimie ParisTech
- PSL Research University
- Laboratory for Inorganic Chemical Biology
- F-75005 Paris
- France
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64
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Zheng Y, Yi HP, Song BH, Chen SP. Crystal structures of two organic salts of 1,2,3,4-tetrahydro-1,10-phenanthroline. CRYSTALLOGR REP+ 2016. [DOI: 10.1134/s1063774516070154] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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65
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Vasdev RAS, Preston D, Scottwell SØ, Brooks HJL, Crowley JD, Schramm MP. Oxidatively Locked [Co₂L₃] 6+ Cylinders Derived from Bis(bidentate) 2-Pyridyl-1,2,3-triazole "Click" Ligands: Synthesis, Stability, and Antimicrobial Studies. Molecules 2016; 21:E1548. [PMID: 27854348 PMCID: PMC6273053 DOI: 10.3390/molecules21111548] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2016] [Revised: 11/04/2016] [Accepted: 11/10/2016] [Indexed: 11/17/2022] Open
Abstract
A small family of [Co₂(Lpytrz)₃]6+ cylinders was synthesised from bis(bidentate) 2-pyridyl-1,2,3-triazole "click" ligands (Lpytrz) through an "assembly-followed-by-oxidation" method. The cylinders were characterised using ¹H, 13C, and DOSY NMR, IR, and UV-Vis spectroscopies, along with electrospray ionisation mass spectrometry (ESMS). Stability studies were conducted in dimethyl sulfoxide (DMSO) and D₂O. In contrast to similar, previously studied, [Fe₂(Lpytrz)₃]4+ helicates the more kinetically inert [Co₂(Lpytrz)₃]6+ systems proved stable (over a period of days) when exposed to DMSO and were even more stable in D₂O. The triply stranded [Co₂(Lpytrz)₃]6+ systems and the corresponding "free" ligands were tested for antimicrobial activity in vitro against both Gram-positive (Staphylococcus aureus) and Gram-negative (Escherichia coli) microorganisms. Agar-based disk diffusion and Mueller-Hinton broth micro-dilution assays showed that the [Co₂(Lpytrz)₃]6+ cylinders were not active against either strain of bacteria. It is presumed that a high charge of the [Co₂(Lpytrz)₃]6+ cylinders is preventing them from crossing the bacterial cell membranes, rendering the compounds biologically inactive.
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Affiliation(s)
- Roan A S Vasdev
- Department of Chemistry, University of Otago, P.O. Box 56, Dunedin 9016, Otago, New Zealand.
| | - Dan Preston
- Department of Chemistry, University of Otago, P.O. Box 56, Dunedin 9016, Otago, New Zealand.
| | - Synøve Ø Scottwell
- Department of Chemistry, University of Otago, P.O. Box 56, Dunedin 9016, Otago, New Zealand.
| | - Heather J L Brooks
- Department of Microbiology and Immunology, University of Otago, P.O. Box 56, 720 Cumberland Street, Dunedin 9054, Otago, New Zealand.
| | - James D Crowley
- Department of Chemistry, University of Otago, P.O. Box 56, Dunedin 9016, Otago, New Zealand.
| | - Michael P Schramm
- Department of Chemistry and Biochemistry, California State University, Long Beach, 1250 Bellflower Boulevard, Long Beach, CA 90840-9507, USA.
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66
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Weber DK, Sani MA, Downton MT, Separovic F, Keene FR, Collins JG. Membrane Insertion of a Dinuclear Polypyridylruthenium(II) Complex Revealed by Solid-State NMR and Molecular Dynamics Simulation: Implications for Selective Antibacterial Activity. J Am Chem Soc 2016; 138:15267-15277. [DOI: 10.1021/jacs.6b09996] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Daniel K. Weber
- Computational
Biophysics, IBM Research Australia, Melbourne, VIC 3010, Australia
- School
of Chemistry, Bio21 Institute, University of Melbourne, Parkville, VIC 3010, Australia
| | - Marc-Antoine Sani
- School
of Chemistry, Bio21 Institute, University of Melbourne, Parkville, VIC 3010, Australia
| | - Matthew T. Downton
- Computational
Biophysics, IBM Research Australia, Melbourne, VIC 3010, Australia
- School
of Chemistry, Bio21 Institute, University of Melbourne, Parkville, VIC 3010, Australia
| | - Frances Separovic
- School
of Chemistry, Bio21 Institute, University of Melbourne, Parkville, VIC 3010, Australia
| | - F. Richard Keene
- School
of Physical Sciences, University of Adelaide, Adelaide, SA 5005, Australia
- Centre for Biodiscovery & Molecular Development of Therapeutics, James Cook University, Townsville, QLD 4811, Australia
| | - J. Grant Collins
- School
of Physical, Environmental and Mathematical Sciences, University of New South Wales, Australian Defence Force Academy, Canberra, ACT 2600, Australia
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67
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Alberti E, Zampakou M, Donghi D. Covalent and non-covalent binding of metal complexes to RNA. J Inorg Biochem 2016; 163:278-291. [DOI: 10.1016/j.jinorgbio.2016.04.021] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2015] [Revised: 03/12/2016] [Accepted: 04/12/2016] [Indexed: 01/19/2023]
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68
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Kumar SV, Scottwell SØ, Waugh E, McAdam CJ, Hanton LR, Brooks HJL, Crowley JD. Antimicrobial Properties of Tris(homoleptic) Ruthenium(II) 2-Pyridyl-1,2,3-triazole “Click” Complexes against Pathogenic Bacteria, Including Methicillin-Resistant Staphylococcus aureus (MRSA). Inorg Chem 2016; 55:9767-9777. [DOI: 10.1021/acs.inorgchem.6b01574] [Citation(s) in RCA: 57] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Sreedhar V. Kumar
- Department
of Chemistry, University of Otago, PO Box 56, Dunedin, New Zealand
- Department
of Microbiology and Immunology, Otago School of Medical Sciences, University of Otago, PO Box 56, Dunedin, New Zealand
| | - Synøve Ø. Scottwell
- Department
of Chemistry, University of Otago, PO Box 56, Dunedin, New Zealand
- Department
of Microbiology and Immunology, Otago School of Medical Sciences, University of Otago, PO Box 56, Dunedin, New Zealand
| | - Emily Waugh
- Department
of Microbiology and Immunology, Otago School of Medical Sciences, University of Otago, PO Box 56, Dunedin, New Zealand
| | - C. John McAdam
- Department
of Chemistry, University of Otago, PO Box 56, Dunedin, New Zealand
| | - Lyall R. Hanton
- Department
of Chemistry, University of Otago, PO Box 56, Dunedin, New Zealand
| | - Heather J. L. Brooks
- Department
of Microbiology and Immunology, Otago School of Medical Sciences, University of Otago, PO Box 56, Dunedin, New Zealand
| | - James D. Crowley
- Department
of Chemistry, University of Otago, PO Box 56, Dunedin, New Zealand
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69
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Li X, Heimann K, Dinh XT, Keene FR, Collins JG. Biological processing of dinuclear ruthenium complexes in eukaryotic cells. MOLECULAR BIOSYSTEMS 2016; 12:3032-45. [PMID: 27453040 DOI: 10.1039/c6mb00431h] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The biological processing - mechanism of cellular uptake, effects on the cytoplasmic and mitochondrial membranes, intracellular sites of localisation and induction of reactive oxygen species - of two dinuclear polypyridylruthenium(ii) complexes has been examined in three eukaryotic cells lines. Flow cytometry was used to determine the uptake of [{Ru(phen)2}2{μ-bb12}](4+) (Rubb12) and [Ru(phen)2(μ-bb7)Ru(tpy)Cl](3+) {Rubb7-Cl, where phen = 1,10-phenanthroline, tpy = 2,2':6',2''-terpyridine and bbn = bis[4(4'-methyl-2,2'-bipyridyl)]-1,n-alkane} in baby hamster kidney (BHK), human embryonic kidney (HEK-293) and liver carcinoma (HepG2) cell lines. The results demonstrated that the major uptake mechanism for Rubb12 and Rubb7-Cl was active transport, although with a significant contribution from carrier-assisted diffusion for Rubb12 and passive diffusion for Rubb7-Cl. Flow cytometry coupled with Annexin V/TO-PRO-3 double-staining was used to compare cell death by membrane damage or apoptosis. Rubb12 induced significant direct membrane damage, particularly with HepG2 cells, while Rubb7-Cl caused considerably less membrane damage but induced greater levels of apoptosis. Confocal microscopy, coupled with JC-1 assays, demonstrated that Rubb12 depolarises the mitochondrial membrane, whereas Rubb7-Cl had a much smaller affect. Cellular localisation experiments indicated that Rubb12 did not accumulate in the mitochondria, whereas significant mitochondrial accumulation was observed for Rubb7-Cl. The effect of Rubb12 and Rubb7-Cl on intracellular superoxide dismutase activity showed that the ruthenium complexes could induce cell death via a reactive oxygen species-mediated pathway. The results of this study demonstrate that Rubb12 predominantly kills eukaryotic cells by damaging the cytoplasmic membrane. As this dinuclear ruthenium complex has been previously shown to exhibit greater toxicity towards bacteria than eukaryotic cells, the results of the present study suggest that metal-based cationic oligomers can achieve selective toxicity against bacteria, despite exhibiting a non-specific membrane damage mechanism of action.
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Affiliation(s)
- Xin Li
- School of Physical, Environmental and Mathematical Sciences, University of New South Wales, Australian Defence Force Academy, Canberra, ACT 2600, Australia.
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70
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Gorle AK, Li X, Primrose S, Li F, Feterl M, Kinobe RT, Heimann K, Warner JM, Keene FR, Collins JG. Oligonuclear polypyridylruthenium(II) complexes: selectivity between bacteria and eukaryotic cells. J Antimicrob Chemother 2016; 71:1547-55. [PMID: 26945708 DOI: 10.1093/jac/dkw026] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2015] [Accepted: 01/25/2016] [Indexed: 12/28/2022] Open
Abstract
OBJECTIVES The objectives of this study were to: (i) determine the in vitro activities of a series of di-, tri- and tetra-nuclear ruthenium complexes (Rubbn, Rubbn-tri and Rubbn-tetra) against a range of Gram-positive and -negative bacteria and compare the antimicrobial activities with the corresponding toxicities against eukaryotic cells; and (ii) compare MIC values with achievable in vivo serum concentrations for the least toxic ruthenium complex. METHODS The in vitro activities were determined by MIC assays and time-kill curve experiments, while the toxicities of the ruthenium complexes were determined using the Alamar blue cytotoxicity assay. A preliminary pharmacokinetic study was undertaken to determine the Rubb12 serum concentration in mice as a function of time after administration. RESULTS Rubb12, Rubb12-tri and Rubb12-tetra are highly active, with MIC values of 1-2 mg/L (0.5-1.5 μM) for a range of Gram-positive strains, but showed variable activities against a panel of Gram-negative bacteria. Time-kill experiments indicated that Rubb12, Rubb12-tri and Rubb12-tetra are bactericidal and kill bacteria within 3-8 h. The di-, tri- and tetra-nuclear complexes were ∼50 times more toxic to Gram-positive bacteria and 25 times more toxic to Gram-negative strains, classified as susceptible, than to liver and kidney cells. Preliminary pharmacokinetic experiments established that serum concentrations higher than MIC values can be obtained for Rubb12 with an administered dose of 32 mg/kg. CONCLUSIONS The ruthenium complexes, particularly Rubb12, have potential as new antimicrobial agents. The structure of the dinuclear ruthenium complex can be readily further modified in order to increase the selectivity for bacteria over eukaryotic cells.
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Affiliation(s)
- Anil K Gorle
- School of Physical, Environmental and Mathematical Sciences, University of New South Wales, Australian Defence Force Academy, Canberra, ACT 2600, Australia
| | - Xin Li
- School of Physical, Environmental and Mathematical Sciences, University of New South Wales, Australian Defence Force Academy, Canberra, ACT 2600, Australia
| | - Sebastian Primrose
- College of Public Health, Medical and Veterinary Sciences, James Cook University, Townsville, QLD 4811, Australia Centre for Biodiscovery and Molecular Development of Therapeutics, James Cook University, Townsville, QLD 4811, Australia
| | - Fangfei Li
- School of Physical, Environmental and Mathematical Sciences, University of New South Wales, Australian Defence Force Academy, Canberra, ACT 2600, Australia
| | - Marshall Feterl
- College of Public Health, Medical and Veterinary Sciences, James Cook University, Townsville, QLD 4811, Australia Centre for Biodiscovery and Molecular Development of Therapeutics, James Cook University, Townsville, QLD 4811, Australia
| | - Robert T Kinobe
- College of Public Health, Medical and Veterinary Sciences, James Cook University, Townsville, QLD 4811, Australia Centre for Biodiscovery and Molecular Development of Therapeutics, James Cook University, Townsville, QLD 4811, Australia
| | - Kirsten Heimann
- Centre for Biodiscovery and Molecular Development of Therapeutics, James Cook University, Townsville, QLD 4811, Australia College of Marine & Environmental Sciences, James Cook University, Townsville, QLD 4811, Australia
| | - Jeffrey M Warner
- College of Public Health, Medical and Veterinary Sciences, James Cook University, Townsville, QLD 4811, Australia Centre for Biodiscovery and Molecular Development of Therapeutics, James Cook University, Townsville, QLD 4811, Australia
| | - F Richard Keene
- Centre for Biodiscovery and Molecular Development of Therapeutics, James Cook University, Townsville, QLD 4811, Australia College of Science, Technology and Engineering, James Cook University, Townsville, QLD 4811, Australia School of Physical Sciences, University of Adelaide, Adelaide, SA 5000, Australia
| | - J Grant Collins
- School of Physical, Environmental and Mathematical Sciences, University of New South Wales, Australian Defence Force Academy, Canberra, ACT 2600, Australia
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71
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Li X, Heimann K, Li F, Warner JM, Richard Keene F, Grant Collins J. Dinuclear ruthenium(ii) complexes containing one inert metal centre and one coordinatively-labile metal centre: syntheses and biological activities. Dalton Trans 2016; 45:4017-29. [DOI: 10.1039/c5dt04885k] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Dinuclear ruthenium(ii) complexes containing one inert and one labile metal centre have been synthesised and their biological properties examined in bacterial and eukaryotic cells.
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Affiliation(s)
- Xin Li
- School of Physical
- Environmental and Mathematical Sciences
- University of New South Wales
- Australian Defence Force Academy
- Canberra
| | - Kirsten Heimann
- College of Marine & Environmental Sciences
- James Cook University
- Townsville
- Australia
- Centre for Biodiscovery and Molecular Development of Therapeutics
| | - Fangfei Li
- School of Physical
- Environmental and Mathematical Sciences
- University of New South Wales
- Australian Defence Force Academy
- Canberra
| | - Jeffrey M. Warner
- Centre for Biodiscovery and Molecular Development of Therapeutics
- James Cook University
- Townsville
- Australia
- College of Public Health
| | - F. Richard Keene
- Centre for Biodiscovery and Molecular Development of Therapeutics
- James Cook University
- Townsville
- Australia
- College of Science
| | - J. Grant Collins
- School of Physical
- Environmental and Mathematical Sciences
- University of New South Wales
- Australian Defence Force Academy
- Canberra
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72
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Mehta JV, Gajera SB, Patel MN. Design, synthesis and biological evaluation of pyrazoline nucleus based homoleptic Ru(iii) compounds. MEDCHEMCOMM 2016. [DOI: 10.1039/c6md00149a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Biological applications of homoleptic Ru(iii) compounds towards molecular docking, DNA-binding and DNA cleavage.
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73
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Mehta JV, Gajera SB, Raval DB, Thakkar VR, Patel MN. Biological assessment of substituted quinoline based heteroleptic organometallic compounds. MEDCHEMCOMM 2016. [DOI: 10.1039/c6md00251j] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Spectral changes accompanying addition of HS DNA to solution of quinoline nucleus based piano stool coordination compounds indicate intercalative mode of binding of the compound between DNA base pairs.
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Affiliation(s)
- Jugal V. Mehta
- Department of Chemistry
- Sardar Patel University
- Vallabh Vidyanagar–388 120
- India
| | - Sanjay B. Gajera
- Department of Chemistry
- Sardar Patel University
- Vallabh Vidyanagar–388 120
- India
| | - Dilip B. Raval
- B. R. Doshi School of Bioscience
- Sardar Patel University
- Vallabh Vidyanagar-388 120
- India
| | - Vasudev R. Thakkar
- B. R. Doshi School of Bioscience
- Sardar Patel University
- Vallabh Vidyanagar-388 120
- India
| | - Mohan N. Patel
- Department of Chemistry
- Sardar Patel University
- Vallabh Vidyanagar–388 120
- India
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Abstract
One of the major advances in medical science has been the development of antimicrobials; however, a consequence of their widespread use has been the emergence of drug-resistant populations of microorganisms. There is clearly a need for the development of new antimicrobials--but more importantly, there is the need for the development of new classes of antimicrobials, rather than drugs based upon analogues of known scaffolds. Due to the success of the platinum anticancer agents, there has been considerable interest in the development of therapeutic agents based upon other transition metals--and in particular ruthenium(II/III) complexes, due to their well known interaction with DNA. There have been many studies of the anticancer properties and cellular localisation of a range of ruthenium complexes in eukaryotic cells over the last decade. However, only very recently has there been significant interest in their antimicrobial properties. This review highlights the types of ruthenium complexes that have exhibited significant antimicrobial activity and discusses the relationship between chemical structure and biological processing--including site(s) of intracellular accumulation--of the ruthenium complexes in both bacterial and eukaryotic cells.
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Affiliation(s)
- Fangfei Li
- School of Physical, Environmental and Mathematical Sciences, University of New South Wales, Australian Defence Force Academy, Canberra, ACT 2600, Australia.
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75
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Nyawade EA, Friedrich HB, Omondi B, Chenia HY, Singh M, Gorle S. Synthesis and characterization of new α,α′-diaminoalkane-bridged dicarbonyl(η 5 -cyclopentadienyl)ruthenium(II) complex salts: Antibacterial activity tests of η 5 -cyclopentadienyl dicarbonyl ruthenium(II) amine complexes. J Organomet Chem 2015. [DOI: 10.1016/j.jorganchem.2015.09.007] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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76
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Wragg A, Gill MR, McKenzie L, Glover C, Mowll R, Weinstein JA, Su X, Smythe C, Thomas JA. Serum Albumin Binding Inhibits Nuclear Uptake of Luminescent Metal-Complex-Based DNA Imaging Probes. Chemistry 2015; 21:11865-71. [PMID: 26133680 DOI: 10.1002/chem.201501675] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2015] [Indexed: 11/07/2022]
Abstract
The DNA binding and cellular localization properties of a new luminescent heterobimetallic Ir(III) Ru(II) tetrapyridophenazine complex are reported. Surprisingly, in standard cell media, in which its tetracationic, isostructural Ru(II) Ru(II) analogue is localized in the nucleus, the new tricationic complex is poorly taken up by live cells and demonstrates no nuclear staining. Consequent cell-free studies reveal that the Ir(III) Ru(II) complex binds bovine serum albumin, BSA, in Sudlow's Site I with a similar increase in emission and binding affinity to that observed with DNA. Contrastingly, in serum-free conditions the complex is rapidly internalized by live cells, where it localizes in cell nuclei and functions as a DNA imaging agent. The absence of serum proteins also greatly alters the cytotoxicity of the complex, where high levels of oncosis/necrosis are observed due to this enhanced uptake. This suggests that simply increasing the lipophilicity of a DNA imaging probe to enhance cellular uptake can be counterproductive as, due to increased binding to serum albumin protein, this strategy can actually disrupt nuclear targeting.
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Affiliation(s)
- Ashley Wragg
- Department of Chemistry, University of Chemistry, Sheffield S3 7HF (UK), Fax: (+44) 114-222-9346
| | - Martin R Gill
- Department of Biomedical Science, University of Sheffield, Sheffield S10 2TN (UK)
| | - Luke McKenzie
- Department of Chemistry, University of Chemistry, Sheffield S3 7HF (UK), Fax: (+44) 114-222-9346
| | - Caroline Glover
- Department of Chemistry, University of Chemistry, Sheffield S3 7HF (UK), Fax: (+44) 114-222-9346
| | - Rachel Mowll
- Department of Chemistry, University of Chemistry, Sheffield S3 7HF (UK), Fax: (+44) 114-222-9346
| | - Julia A Weinstein
- Department of Chemistry, University of Chemistry, Sheffield S3 7HF (UK), Fax: (+44) 114-222-9346
| | - Xiaodi Su
- Institute of Material Research and Engineering, A*STAR (Agency for Science, Technology and Research), Singapore 117602
| | - Carl Smythe
- Department of Biomedical Science, University of Sheffield, Sheffield S10 2TN (UK)
| | - Jim A Thomas
- Department of Chemistry, University of Chemistry, Sheffield S3 7HF (UK), Fax: (+44) 114-222-9346.
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77
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Gorle AK, Feterl M, Warner JM, Primrose S, Constantinoiu CC, Keene FR, Collins JG. Mononuclear Polypyridylruthenium(II) Complexes with High Membrane Permeability in Gram-Negative Bacteria-in particularPseudomonas aeruginosa. Chemistry 2015; 21:10472-81. [DOI: 10.1002/chem.201500385] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2015] [Indexed: 01/10/2023]
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78
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Mulyana Y, Keene FR, Spiccia L. Cooperative effects in homogenous water oxidation catalysis by mononuclear ruthenium complexes. Dalton Trans 2015; 43:6819-27. [PMID: 24647472 DOI: 10.1039/c4dt00629a] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The homogenous water oxidation catalysis by [Ru(terpy)(bipy)Cl](+) (1) and [Ru(terpy)(Me2bipy)Cl](+) (2) (terpy = 2,2':6',2''-terpyridine, bipy = 2,2'-bipyridine, Me2bipy = 4,4'-dimethyl-2,2'-bipyridine) under the influence of two redox mediators [Ru(bipy)3](2+) (3) and [Ru(phen)2(Me2bipy)](2+) (4) (phen = 1,10-phenanthroline) was investigated using Ce(4+) as sacrificial oxidant. Oxygen evolution experiments revealed that mixtures of both 2-4 and 2-3 produced more molecular oxygen than catalyst 2 alone. In contrast, the combination of mediator 4 and catalyst 1 resulted in a lower catalytic performance of 1. Measurements of the temporal change in the intensity of a UV transition at 261 nm caused by the addition of four equivalents of Ce(4+) to 2 revealed three distinctive regions-suggested to correspond to the stepwise processes: (i) [Ru(IV)=O](2+) → [Ru(V)=O](3+); (ii) [Ru(V)=O](3+) → [Ru(III)-(OOH)](2+); and (iii) [Ru(III)-(OOH)](2+) → [Ru(II)-OH2](2+). UV-Visible spectrophotometric experiments on the 1-4 and 2-4 mixtures, also carried out with four equivalents of Ce(4+), demonstrated a faster [Ru(phen)2(Me2bipy)](3+) → [Ru(phen)2(Me2bipy)](2+) reduction rate in 2-4 than that observed for the 1-4 combination. Cyclic voltammetry data measured for the catalysts and the mixtures revealed a coincidence in the potentials of the Ru(II)/Ru(III) redox process of mediators 3 and 4 and the predicted [Ru(IV)=O](2+)/[Ru(V)=O](3+) potential of catalyst 2. In contrast, the [Ru(IV)=O](2+)/[Ru(V)=O](3+) process for catalyst 1 was found to occur at a higher potential than the Ru(II)/Ru(III) redox process for 4. Both the spectroscopic and electrochemical experiments provide evidence that the interplay between the mediator and the catalyst is an important determinant of the catalytic activity.
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Affiliation(s)
- Yanyan Mulyana
- School of Chemistry and Australian Centre of Excellence for Electromaterials Science, Monash University, Victoria 3800, Australia.
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79
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Jain N, Alam P, Laskar IR, Panwar J. ‘Aggregation induced phosphorescence’ active iridium(iii) complexes for integrated sensing and inhibition of bacterial growth in aqueous solution. RSC Adv 2015. [DOI: 10.1039/c5ra10161a] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The present study attempts to develop a sensitive method to utilize ‘aggregation induced emission (AIE)’ active iridium(iii) complexes as potential agents for “integrated” sensing and inhibition of bacterial growth in aqueous systems.
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Affiliation(s)
- Navin Jain
- Department of Biological Sciences
- Birla Institute of Technology and Science
- Pilani – 333031
- India
| | - Parvej Alam
- Department of Chemistry
- Birla Institute of Technology and Science
- Pilani – 333031
- India
| | - Inamur Rahaman Laskar
- Department of Chemistry
- Birla Institute of Technology and Science
- Pilani – 333031
- India
| | - Jitendra Panwar
- Department of Biological Sciences
- Birla Institute of Technology and Science
- Pilani – 333031
- India
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80
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Zhang Z, Wang YJ, Wu Q, Wu XH, Sun FQ, Wang BG, Mei WJ, Chen SD. Microwave-Assisted Synthesis of Ruthenium(II) Complexes with Trimethylsilylacetylene as Inhibitors against the Migration of Breast Cancer Cells. Aust J Chem 2015. [DOI: 10.1071/ch14192] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
In the present study, two novel chiral ruthenium(ii) complexes with trimethylsilylacetylene (TMSA), Λ- and Δ-[Ru(bpy)2(p-TEPIP)](ClO4)2 (bpy = 2,2-bipyridine; p-TEPIP = 5-(2-(p-trimethylsilyl propargyl)-1H-imidazo[4,5-f][1,10] phenanthroline) (Λ-1 and Δ-1) were prepared using Sonogashira coupling reaction under microwave irradiation. We found that both Λ-1 and Δ-1 could inhibit the growth of highly metastatic human breast cancer cells (MDA-MB-231) with half-maximal inhibitory concentration (IC50) of 32.1 and 36.9 µM, respectively. Wound healing assay demonstrated that both isomers inhibited the migration of MDA-MB-231 cells. Both Λ-1 and Δ-1 compounds were found throughout the cell and were particularly enriched in the nucleus. Furthermore, we observed fragmentation of the nucleus leading to apoptosis. To conclude, it is clear that this type of chiral ruthenium(ii) complex with TMSA can induce apoptosis and thus inhibit the growth and migration of tumour cells.
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81
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Synthesis, structure, stability and antimicrobial activity of a ruthenium(II) helicate derived from a bis-bidentate “click” pyridyl-1,2,3-triazole ligand. Inorganica Chim Acta 2015. [DOI: 10.1016/j.ica.2014.10.011] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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82
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Tripathy SK, Taviti AC, Dehury N, Sahoo A, Pal S, Beuria TK, Patra S. Synthesis, characterisation and antibacterial activity of [(p-cym)RuX(L)]+/2+ (X = Cl, H2O; L = bpmo, bpms) complexes. Dalton Trans 2015; 44:5114-24. [DOI: 10.1039/c4dt03647f] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Simple replacement of Cl− by H2O in {(p-cym)RuII(L)X]n+ (X = Cl or H2O) complexes enhances antibacterial activity significantly.
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Affiliation(s)
- Suman Kumar Tripathy
- School of Basic Sciences
- Indian Institute of Technology Bhubaneswar
- Bhubaneswar
- India
| | | | - Niranjan Dehury
- School of Basic Sciences
- Indian Institute of Technology Bhubaneswar
- Bhubaneswar
- India
| | - Anupam Sahoo
- School of Basic Sciences
- Indian Institute of Technology Bhubaneswar
- Bhubaneswar
- India
| | - Satyanaryan Pal
- Department of Chemistry
- Ravenshaw University
- Cuttack-753 003
- India
| | | | - Srikanta Patra
- School of Basic Sciences
- Indian Institute of Technology Bhubaneswar
- Bhubaneswar
- India
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83
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Mehta JV, Gajera SB, Thakor P, Thakkar VR, Patel MN. Synthesis of 1,3,5-trisubstituted pyrazoline derivatives and their applications. RSC Adv 2015. [DOI: 10.1039/c5ra17185g] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The biological activities of pyrazoline based Ru(iii) complexes were carried out using gel electrophoresis, absorption titration, cellular level cytotoxicity and molecular docking study. Compounds exhibit potent nuclease and cytotoxicity activity.
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Affiliation(s)
| | | | - Parth Thakor
- Sardar Patel University
- B. R. Doshi School of Biosciences
- India
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84
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Li X, Gorle AK, Ainsworth TD, Heimann K, Woodward CE, Grant Collins J, Richard Keene F. RNA and DNA binding of inert oligonuclear ruthenium(ii) complexes in live eukaryotic cells. Dalton Trans 2015; 44:3594-603. [DOI: 10.1039/c4dt02575j] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Oligonuclear polypyridylruthenium(ii) complexes show selectivity for the nucleus of eukaryotic cells with a considerable preference for the RNA-rich nucleolus.
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Affiliation(s)
- Xin Li
- School of Physical
- Environmental and Mathematical Sciences
- University of New South Wales
- Australian Defence Force Academy
- Canberra
| | - Anil K. Gorle
- School of Physical
- Environmental and Mathematical Sciences
- University of New South Wales
- Australian Defence Force Academy
- Canberra
| | - Tracy D. Ainsworth
- ARC Centre of Excellence for Coral Reef Studies
- James Cook University
- Townsville
- Australia
| | - Kirsten Heimann
- College of Marine & Environmental Sciences
- James Cook University
- Townsville
- Australia
- Centre for Biodiscovery and Molecular Development of Therapeutics
| | - Clifford E. Woodward
- School of Physical
- Environmental and Mathematical Sciences
- University of New South Wales
- Australian Defence Force Academy
- Canberra
| | - J. Grant Collins
- School of Physical
- Environmental and Mathematical Sciences
- University of New South Wales
- Australian Defence Force Academy
- Canberra
| | - F. Richard Keene
- Centre for Biodiscovery and Molecular Development of Therapeutics
- James Cook University
- Townsville
- Australia
- Department of Matter & Materials
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85
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Deng J, Su HP, Chen SP. Crystal structures of 5,6-dimethyl-1,2,3,4-tetrahydro-1,10-phenanthroline and its benzene sulfonate. CRYSTALLOGR REP+ 2014. [DOI: 10.1134/s1063774514080021] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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86
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Desmond RT, Magpusao AN, Lorenc C, Alverson JB, Priestley N, Peczuh MW. De novo macrolide-glycolipid macrolactone hybrids: Synthesis, structure and antibiotic activity of carbohydrate-fused macrocycles. Beilstein J Org Chem 2014; 10:2215-21. [PMID: 25246980 PMCID: PMC4168945 DOI: 10.3762/bjoc.10.229] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2014] [Accepted: 08/29/2014] [Indexed: 01/17/2023] Open
Abstract
Natural product-like macrocycles were designed as potential antibacterial compounds. The macrocycles featured a D-glucose unit fused into a 12- or 13-member macrolactone. The rings are connected via the C6' and anomeric (C1') positions of the monosaccharide. The new macrocycles/macrolides were characterized by X-ray crystallography. Their structures showed that, in addition to the ester and alkene units, the dihedral angle about the glycosidic linkage (exo-anomeric effect) influenced the overall shape of the molecules. Glycosylation of an available hydroxy group on the macrocycle gave a hybrid macrolide with features common to erythromycin and sophorlipid macrolactone. Weak antibiotic activity (MICs <100 μg/mL) was observed for several of the compounds.
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Affiliation(s)
- Richard T Desmond
- Department of Chemistry, University of Connecticut, 55 N. Eagleville Road, U3060, Storrs, CT 06269, USA, +1-860-486-1605 FAX: +1-860-486-2981
| | - Anniefer N Magpusao
- Department of Chemistry, University of Connecticut, 55 N. Eagleville Road, U3060, Storrs, CT 06269, USA, +1-860-486-1605 FAX: +1-860-486-2981
| | - Chris Lorenc
- Department of Chemistry, University of Connecticut, 55 N. Eagleville Road, U3060, Storrs, CT 06269, USA, +1-860-486-1605 FAX: +1-860-486-2981
| | - Jeremy B Alverson
- Department of Chemistry and Biochemistry, University of Montana, Missoula, MT 59812, USA
| | - Nigel Priestley
- Department of Chemistry and Biochemistry, University of Montana, Missoula, MT 59812, USA
| | - Mark W Peczuh
- Department of Chemistry, University of Connecticut, 55 N. Eagleville Road, U3060, Storrs, CT 06269, USA, +1-860-486-1605 FAX: +1-860-486-2981
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87
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Chemical interference with iron transport systems to suppress bacterial growth of Streptococcus pneumoniae. PLoS One 2014; 9:e105953. [PMID: 25170896 PMCID: PMC4149436 DOI: 10.1371/journal.pone.0105953] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2014] [Accepted: 07/26/2014] [Indexed: 12/02/2022] Open
Abstract
Iron is an essential nutrient for the growth of most bacteria. To obtain iron, bacteria have developed specific iron-transport systems located on the membrane surface to uptake iron and iron complexes such as ferrichrome. Interference with the iron-acquisition systems should be therefore an efficient strategy to suppress bacterial growth and infection. Based on the chemical similarity of iron and ruthenium, we used a Ru(II) complex R-825 to compete with ferrichrome for the ferrichrome-transport pathway in Streptococcus pneumoniae. R-825 inhibited the bacterial growth of S. pneumoniae and stimulated the expression of PiuA, the iron-binding protein in the ferrichrome-uptake system on the cell surface. R-825 treatment decreased the cellular content of iron, accompanying with the increase of Ru(II) level in the bacterium. When the piuA gene (SPD_0915) was deleted in the bacterium, the mutant strain became resistant to R-825 treatment, with decreased content of Ru(II). Addition of ferrichrome can rescue the bacterial growth that was suppressed by R-825. Fluorescence spectral quenching showed that R-825 can bind with PiuA in a similar pattern to the ferrichrome-PiuA interaction in vitro. These observations demonstrated that Ru(II) complex R-825 can compete with ferrichrome for the ferrichrome-transport system to enter S. pneumoniae, reduce the cellular iron supply, and thus suppress the bacterial growth. This finding suggests a novel antimicrobial approach by interfering with iron-uptake pathways, which is different from the mechanisms used by current antibiotics.
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88
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Frei A, Rubbiani R, Tubafard S, Blacque O, Anstaett P, Felgenträger A, Maisch T, Spiccia L, Gasser G. Synthesis, characterization, and biological evaluation of new Ru(II) polypyridyl photosensitizers for photodynamic therapy. J Med Chem 2014; 57:7280-92. [PMID: 25121347 DOI: 10.1021/jm500566f] [Citation(s) in RCA: 143] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Two Ru(II) polypyridyl complexes, Ru(DIP)2(bdt) (1) and [Ru(dqpCO2Me)(ptpy)](2+) (2) (DIP = 4,7-diphenyl-1,10-phenanthroline, bdt = 1,2-benzenedithiolate, dqpCO2Me = 4-methylcarboxy-2,6-di(quinolin-8-yl)pyridine), ptpy = 4'-phenyl-2,2':6',2″-terpyridine) have been investigated as photosensitizers (PSs) for photodynamic therapy (PDT). In our experimental settings, the phototoxicity and phototoxic index (PI) of 2 (IC50(light): 25.3 μM, 420 nm, 6.95 J/cm(2); PI >4) and particularly of 1 (IC50(light): 0.62 μM, 420 nm, 6.95 J/cm(2); PI: 80) are considerably superior compared to the two clinically approved PSs porfimer sodium and 5-aminolevulinic acid. Cellular uptake and distribution of these complexes was investigated by confocal microscopy (1) and by inductively coupled plasma mass spectrometry (1 and 2). Their phototoxicity was also determined against the Gram-(+) Staphylococcus aureus and Gram-(-) Escherichia coli for potential antimicrobial PDT (aPDT) applications. Both complexes showed significant aPDT activity (420 nm, 8 J/cm(2)) against Gram-(+) (S. aureus; >6 log10 CFU reduction) and, for 2, also against Gram-(-) E. coli (>4 log10 CFU reduction).
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Affiliation(s)
- Angelo Frei
- Department of Chemistry, University of Zurich , Winterthurerstrasse 190, CH-8057 Zurich, Switzerland
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89
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Ahmad H, Wragg A, Cullen W, Wombwell C, Meijer AJHM, Thomas JA. From Intercalation to Groove Binding: Switching the DNA-Binding Mode of Isostructural Transition-Metal Complexes. Chemistry 2014; 20:3089-96. [DOI: 10.1002/chem.201304053] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2013] [Revised: 12/10/2013] [Indexed: 11/06/2022]
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90
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Lam PL, Lu GL, Hon KM, Lee KW, Ho CL, Wang X, Tang JCO, Lam KH, Wong RSM, Kok SHL, Bian ZX, Li H, Lee KKH, Gambari R, Chui CH, Wong WY. Development of ruthenium(II) complexes as topical antibiotics against methicillin resistant Staphylococcus aureus. Dalton Trans 2014; 43:3949-57. [PMID: 24448670 DOI: 10.1039/c3dt52879k] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
A series of ruthenium(II) bis(2,2'-bipyridyl) complexes containing N-phenyl-substituted diazafluorenes (Ru-C1, Ru-C6, Ru-C7 and Ru-F) was synthesized and their potential antibacterial activity against methicillin resistant Staphylococcus aureus (MRSA) was investigated. The Ru-C7 complex showed significant improvement in both minimum inhibitory concentration (MIC, 6.25 μg mL(-1)) and minimum bactericidal concentration (MBC, 25 μg mL(-1)) towards MRSA when compared with those of methicillin (positive control) (MIC = 25 μg mL(-1) and MBC = 100 μg mL(-1)). The Ru-C7 complex possessed much stronger antibacterial effects than the Ru-C6 complex (MIC, 25 μg mL(-1), MBC, >100 μg mL(-1)). Both Ru-C6 and Ru-C7 complexes were also demonstrated to be biologically safe when tested on normal human skin keratinocytes.
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Affiliation(s)
- P-L Lam
- State Key Laboratory of Chirosciences, Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hong Kong, P.R. China
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91
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Gorle AK, Feterl M, Warner JM, Wallace L, Keene FR, Collins JG. Tri- and tetra-nuclear polypyridyl ruthenium(ii) complexes as antimicrobial agents. Dalton Trans 2014; 43:16713-25. [DOI: 10.1039/c4dt02139h] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Tri- and tetra-nuclear polypyridylruthenium(ii) complexes have been synthesised which exhibit high levels of antimicrobial activity.
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Affiliation(s)
- Anil K. Gorle
- School of Physical
- Environmental and Mathematical Sciences
- University of New South Wales
- Australian Defence Force Academy
- Canberra, Australia
| | - Marshall Feterl
- School of Veterinary and Biomedical Sciences
- James Cook University
- Townsville, Australia
- Centre for Biodiscovery and Molecular Development of Therapeutics
- James Cook University
| | - Jeffrey M. Warner
- School of Veterinary and Biomedical Sciences
- James Cook University
- Townsville, Australia
- Centre for Biodiscovery and Molecular Development of Therapeutics
- James Cook University
| | - Lynne Wallace
- School of Physical
- Environmental and Mathematical Sciences
- University of New South Wales
- Australian Defence Force Academy
- Canberra, Australia
| | - F. Richard Keene
- Centre for Biodiscovery and Molecular Development of Therapeutics
- James Cook University
- Townsville, Australia
- School of Pharmacy and Molecular Sciences
- James Cook University
| | - J. Grant Collins
- School of Physical
- Environmental and Mathematical Sciences
- University of New South Wales
- Australian Defence Force Academy
- Canberra, Australia
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92
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Li F, Harry EJ, Bottomley AL, Edstein MD, Birrell GW, Woodward CE, Keene FR, Collins JG. Dinuclear ruthenium(ii) antimicrobial agents that selectively target polysomes in vivo. Chem Sci 2014. [DOI: 10.1039/c3sc52166d] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
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93
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Li F, Feterl M, Warner JM, Keene FR, Collins JG. Dinuclear polypyridylruthenium(II) complexes: flow cytometry studies of their accumulation in bacteria and the effect on the bacterial membrane. J Antimicrob Chemother 2013; 68:2825-33. [PMID: 23873648 DOI: 10.1093/jac/dkt279] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
OBJECTIVES To determine the energy dependency of and the contribution of the membrane potential to the cellular accumulation of the dinuclear complexes [{Ru(phen)2}2{μ-bbn}](4+) (Rubbn) and the mononuclear complexes [Ru(Me4phen)3](2+) and [Ru(phen)2(bb7)](2+) in Staphylococcus aureus and Escherichia coli, and to examine their effect on the bacterial membrane. METHODS The accumulation of the ruthenium complexes in bacteria was determined using flow cytometry at a range of temperatures. The cellular accumulation of the ruthenium complexes was also determined in cells that had been incubated with the metal complexes in the presence or absence of metabolic stimulators or inhibitors and/or commercial dyes to determine the membrane potential or membrane permeability. RESULTS The accumulation of ruthenium complexes in the two bacterial strains was shown to increase with increasing incubation temperature, with the relative increase in accumulation greater with E. coli, particularly for Rubb12 and Rubb16. No decrease in accumulation was observed for Rubb12 in ATP-inhibited cells. While carbonyl cyanide m-chlorophenyl hydrazone (CCCP) did depolarize the cell membrane, no reduction in the accumulation of Rubb12 was observed; however, all ruthenium complexes, when incubated with S. aureus at concentrations twice their MIC, depolarized the membrane to a similar extent to CCCP. Except for the mononuclear complex [Ru(Me4phen)3](2+), incubation of any of the other ruthenium complexes allowed a greater quantity of the membrane-impermeable dye TO-PRO-3 to be taken up by S. aureus. CONCLUSIONS The results indicate that the potential new antimicrobial Rubbn complexes enter the cell in an energy-independent manner, depolarize the cell membrane and significantly permeabilize the cellular membrane.
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Affiliation(s)
- Fangfei Li
- School of Physical, Environmental and Mathematical Sciences, University of New South Wales, Australian Defence Force Academy, Canberra, ACT 2600, Australia
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94
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Borges A, Ferreira C, Saavedra MJ, Simões M. Antibacterial activity and mode of action of ferulic and gallic acids against pathogenic bacteria. Microb Drug Resist 2013; 19:256-65. [PMID: 23480526 DOI: 10.1089/mdr.2012.0244] [Citation(s) in RCA: 602] [Impact Index Per Article: 54.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
The increased resistance of pathogenic microorganisms is frequently attributed to the extreme and inadequate use of antibiotics and transmission of resistance within and between individuals. To counter the emergence of resistant microorganisms, considerable resources have been invested in the search for new antimicrobials. Plants synthesize a diverse array of secondary metabolites (phytochemicals) known to be involved in defense mechanisms, and in the last few years it is recognized that some of these molecules have health beneficial effects, including antimicrobial properties. In this study, the mechanism of action of gallic (GA) and ferulic (FA) acids, a hydroxybenzoic acid and a hydroxycinnamic acid, was assessed on Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus, and Listeria monocytogenes. The targets of antimicrobial action were studied using different bacterial physiological indices: minimum inhibitory concentration (MIC), minimum bactericidal concentration (MBC), membrane permeabilization, intracellular potassium release, physicochemical surface properties, and surface charge. It was found that FA and GA had antimicrobial activity against the bacteria tested with MIC of 500 μg/mL for P. aeruginosa, 1500 μg/mL for E. coli, 1750 μg/mL for S. aureus, and 2000 μg/mL for L. monocytogenes with GA; 100 μg/mL for E. coli and P. aeruginosa, 1100 μg/mL and 1250 μg/mL for S. aureus and L. monocytogenes, respectively, with FA. The MBC for E. coli was 2500 μg/mL (FA) and 5000 (GA), for S. aureus was 5000 μg/mL (FA) and 5250 μg/mL (GA), for L. monocytogenes was 5300 μg/mL (FA) and 5500 μg/mL (GA), and 500 μg/mL for P. aeruginosa, with both phytochemicals. GA and FA led to irreversible changes in membrane properties (charge, intra and extracellular permeability, and physicochemical properties) through hydrophobicity changes, decrease of negative surface charge, and occurrence of local rupture or pore formation in the cell membranes with consequent leakage of essential intracellular constituents. The overall study emphasizes the potential of plant-derived molecules as a green and sustainable source of new broad spectrum antimicrobial products.
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Affiliation(s)
- Anabela Borges
- LEPAE, Department of Chemical Engineering, Faculty of Engineering, University of Porto, Porto, Portugal
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95
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Pandrala M, Li F, Wallace L, Steel PJ, Moore II B, Autschbach J, Collins JG, Keene FR. Iridium(III) Complexes Containing 1,10-Phenanthroline and Derivatives: Synthetic, Stereochemical, and Structural Studies, and their Antimicrobial Activity. Aust J Chem 2013. [DOI: 10.1071/ch13264] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
A convenient synthetic strategy is reported for the series of complexes [Ir(pp)3]3+ (where pp = phen, Me2phen and Me4phen) through the intermediacy of the appropriate [Ir(pp)2(CF3SO3)2]+ species. In the case of [Ir(phen)3]3+, the cation was resolved into its enantiomeric forms, for which the absolute configurations were determined by X-ray diffraction. The availability for the first time of the CD spectra allowed comparison with computed CD spectra. Measurement of the antimicrobial activity of the [Ir(pp)3]3+ species {and the [Ir(pp)2X2]+ (X = Cl–, CF3SO3–) precursors involved in their synthesis}, as well as cell uptake studies with the four bacterial strains S. aureus, methicillin-resistant S. aureus (MRSA), E. coli, and P. aeruginosa, indicated that they showed little activity compared with their Ru(ii) analogues. The results suggest that it is unfavourable for an individual metal centre with a 3+ charge to pass across the bacterial cell membrane.
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96
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Li F, Feterl M, Warner JM, Day AI, Keene FR, Collins JG. Protein binding by dinuclear polypyridyl ruthenium(ii) complexes and the effect of cucurbit[10]uril encapsulation. Dalton Trans 2013; 42:8868-77. [DOI: 10.1039/c3dt50551k] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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97
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Zhao XL, Li ZS, Zheng ZB, Zhang AG, Wang KZ. pH luminescence switch, DNA binding and photocleavage, and cytotoxicity of a dinuclear ruthenium complex. Dalton Trans 2013; 42:5764-77. [DOI: 10.1039/c3dt33116d] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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98
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Pandrala M, Li F, Feterl M, Mulyana Y, Warner JM, Wallace L, Keene FR, Collins JG. Chlorido-containing ruthenium(ii) and iridium(iii) complexes as antimicrobial agents. Dalton Trans 2013; 42:4686-94. [DOI: 10.1039/c3dt32775b] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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99
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Krizkova S, Jilkova E, Krejcova L, Cernei N, Hynek D, Ruttkay-Nedecky B, Sochor J, Kynicky J, Adam V, Kizek R. Rapid superparamagnetic-beads-based automated immunoseparation of Zn-proteins fromStaphylococcus aureuswith nanogram yield. Electrophoresis 2012; 34:224-34. [DOI: 10.1002/elps.201200234] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2012] [Revised: 08/14/2012] [Accepted: 09/01/2012] [Indexed: 01/13/2023]
Affiliation(s)
| | - Eva Jilkova
- Department of Chemistry and Biochemistry; Faculty of Agronomy; Mendel University in Brno; Brno; Czech Republic
| | - Ludmila Krejcova
- Department of Chemistry and Biochemistry; Faculty of Agronomy; Mendel University in Brno; Brno; Czech Republic
| | - Natalia Cernei
- Department of Chemistry and Biochemistry; Faculty of Agronomy; Mendel University in Brno; Brno; Czech Republic
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100
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Anchuri SS, Thota S, Bongoni RN, Yerra R, Reddy RN, Dhulipala S. Antimicrobial and Antimalarial Activity of Novel Synthetic Mononuclear Ruthenium(II) Compounds. J CHIN CHEM SOC-TAIP 2012. [DOI: 10.1002/jccs.201200301] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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