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MDR Pumps as Crossroads of Resistance: Antibiotics and Bacteriophages. Antibiotics (Basel) 2022; 11:antibiotics11060734. [PMID: 35740141 PMCID: PMC9220107 DOI: 10.3390/antibiotics11060734] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2022] [Revised: 05/21/2022] [Accepted: 05/26/2022] [Indexed: 01/27/2023] Open
Abstract
At present, antibiotic resistance represents a global problem in modern medicine. In the near future, humanity may face a situation where medicine will be powerless against resistant bacteria and a post-antibiotic era will come. The development of new antibiotics is either very expensive or ineffective due to rapidly developing bacterial resistance. The need to develop alternative approaches to the treatment of bacterial infections, such as phage therapy, is beyond doubt. The cornerstone of bacterial defense against antibiotics are multidrug resistance (MDR) pumps, which are involved in antibiotic resistance, toxin export, biofilm, and persister cell formation. MDR pumps are the primary non-specific defense of bacteria against antibiotics, while drug target modification, drug inactivation, target switching, and target sequestration are the second, specific line of their defense. All bacteria have MDR pumps, and bacteriophages have evolved along with them and use the bacteria’s need for MDR pumps to bind and penetrate into bacterial cells. The study and understanding of the mechanisms of the pumps and their contribution to the overall resistance and to the sensitivity to bacteriophages will allow us to either seriously delay the onset of the post-antibiotic era or even prevent it altogether due to phage-antibiotic synergy.
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Cobalt Bis-Dicarbollide Enhances Antibiotics Action towards Staphylococcus epidermidis Planktonic Growth Due to Cell Envelopes Disruption. Pharmaceuticals (Basel) 2022; 15:ph15050534. [PMID: 35631360 PMCID: PMC9147877 DOI: 10.3390/ph15050534] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Revised: 04/19/2022] [Accepted: 04/22/2022] [Indexed: 02/01/2023] Open
Abstract
The emergence of antibiotic resistance in opportunistic pathogens represents a huge problem, the solution for which may be a treatment with a combination of multiple antimicrobial agents. Sodium salt of cobalt bis-dicarbollide (COSAN.Na) is one of the very stable, low-toxic, amphiphilic boron-rich sandwich complex heteroboranes. This compound has a wide range of potential applications in the biological sciences due to its antitumor, anti-HIV-1, antimicrobial and antibiofilm activity. Our study confirmed the ability of COSAN.Na (in the concentration range 0.2–2.48 µg/mL) to enhance tetracycline, erythromycin, and vancomycin action towards Staphylococcus epidermidis planktonic growth with an additive or synergistic effect (e.g., the combination of 1.24 µg/mL COSAN.Na and 6.5 µg/mL TET). The effective inhibitory concentration of antibiotics was reduced up to tenfold most efficiently in the case of tetracycline (from 65 to 6.5 µg/mL). In addition, strong effect of COSAN.Na on disruption of the cell envelopes was determined using propidium iodide uptake measurement and further confirmed by transmission electron microscopy. The combination of amphiphilic COSAN.Na with antibiotics can therefore be considered a promising way to overcome antibiotic resistance in Gram-positive cocci.
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Nazarov PA, Kuznetsova AM, Karakozova MV. Multidrug Resistance Pumps as a Keystone of Bacterial Resistance. MOSCOW UNIVERSITY BIOLOGICAL SCIENCES BULLETIN 2022; 77:193-200. [PMID: 36843647 PMCID: PMC9940100 DOI: 10.3103/s009639252204006x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/17/2022] [Revised: 10/05/2022] [Accepted: 10/26/2022] [Indexed: 02/22/2023]
Abstract
Antibiotic resistance is a global problem of modern medicine. A harbinger of the onset of the postantibiotic era is the complexity and high cost of developing new antibiotics as well as their inefficiency due to the rapidly developing resistance of bacteria. Multidrug resistance (MDR) pumps, involved in the formation of resistance to xenobiotics, the export of toxins, the maintenance of cellular homeostasis, and the formation of biofilms and persistent cells, are the keystone of bacterial protection against antibiotics. MDR pumps are the basis for the nonspecific protection of bacteria, while modification of the drug target, inactivation of the drug, and switching of the target or sequestration of the target is the second specific line of their protection. Thus, the nonspecific protection of bacteria formed by MDR pumps is a barrier that prevents the penetration of antibacterial substances into the cell, which is the main factor determining the resistance of bacteria. Understanding the mechanisms of MDR pumps and a balanced assessment of their contribution to total resistance, as well as to antibiotic sensitivity, will either seriously delay the onset of the postantibiotic era or prevent its onset in the foreseeable future.
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Affiliation(s)
- P. A. Nazarov
- grid.14476.300000 0001 2342 9668Belozersky Institute of Physicochemical Biology, Moscow State University, 119234 Moscow, Russia
| | - A. M. Kuznetsova
- grid.14476.300000 0001 2342 9668Department of Biology, Moscow State University, 119234 Moscow, Russia
| | - M. V. Karakozova
- grid.454320.40000 0004 0555 3608Skolkovo Institute of Science and Technology, 121205 Moscow, Russia
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Zelinskii GE, Limarev IP, Vologzhanina AV, Olshevskaya VA, Makarenkov AV, Dorovatovskii PV, Chuprin AS, Vershinin MA, Dudkin SV, Voloshin YZ. Synthesis and Structure of the Bis- and Tris-Polyhedral Hybrid Carboranoclathrochelates with Functionalizing Biorelevant Substituents-The Derivatives of Propargylamine Iron(II) Clathrochelates with Terminal Triple C≡C Bond(s). Molecules 2021; 26:3635. [PMID: 34198621 PMCID: PMC8232327 DOI: 10.3390/molecules26123635] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2021] [Revised: 06/09/2021] [Accepted: 06/09/2021] [Indexed: 11/16/2022] Open
Abstract
A synthetic strategy for obtaining structurally flexible hybrid iron(II) carboranoclatrochelates functionalized with biorelevant groups, based on a combination of a 1,3-dipolar cycloaddition reaction with nucleophilic substitution of an appropriate chloroclathrochelate precursor, was developed. In its first stage, a stepwise substitution of the dichloroclathrochelate precursor with amine N-nucleophiles of different natures in various solvents was performed. One of its two chlorine atoms with morpholine or diethylamine in dichloromethane gave reactive monohalogenoclathrochelate complexes functionalized with abiorelevant substituents. Further nucleophilic substitution of their remaining chlorine atoms with propargylamine in DMF led to morpholine- and diethylamine-functionalized monopropargylamine cage complexes, the molecules of which contain the single terminal C≡C bond. Their "click" 1,3-cycloaddition reactions in toluene with ortho-carborane-(1)-methylazide catalyzed by copper(II) acetate gave spacer-containing di- and tritopic iron(II) carboranoclatrochelates formed by a covalent linking between their different polyhedral(cage) fragments. The obtained complexes were characterized using elemental analysis, MALDI-TOF mass, UV-Vis, 1H, 1H{11B}, 11B, 11B{1H}, 19F{1H} and 13C{1H}-NMR spectra, and by a single crystal synchrotron X-ray diffraction experiment for the diethylamine-functionalized iron(II) carboranoclathrochelate. Its encapsulated iron(II) ion is situated almost in the center of the FeN6-coordination polyhedron possessing a geometry intermediate between a trigonal prism and a trigonal antiprism with a distortion angle φ of approximately 28°. Conformation of this hybrid molecule is strongly affected by its intramolecular dihydrogen bonding: a flexibility of the carborane-terminated ribbed substituent allowed the formation of numerous C-H…H-B intramolecular interactions. The H(C) atom of this carborane core also forms the intermolecular C-H…F-B interaction with an adjacent carboranoclathrochelate molecule. The N-H…N intermolecular interaction between the diethylamine group of one hybrid molecule and the heterocyclic five-membered 1H-[1,2,3]-triazolyl fragment of the second molecule of this type caused formation of H-bonded carboranoclathrochelate dimers in the X-rayed crystal.
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Affiliation(s)
- Genrikh E. Zelinskii
- Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, Leninskii pr., 31, 119991 Moscow, Russia; (G.E.Z.); (I.P.L.)
- Nesmeyanov Institute of the Organoelement Compounds of the Russian Academy of Sciences, Vavilova Str., 28, 119991 Moscow, Russia; (A.V.V.); (V.A.O.); (A.V.M.); (A.S.C.); (S.V.D.)
| | - Ilya P. Limarev
- Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, Leninskii pr., 31, 119991 Moscow, Russia; (G.E.Z.); (I.P.L.)
- Nesmeyanov Institute of the Organoelement Compounds of the Russian Academy of Sciences, Vavilova Str., 28, 119991 Moscow, Russia; (A.V.V.); (V.A.O.); (A.V.M.); (A.S.C.); (S.V.D.)
| | - Anna V. Vologzhanina
- Nesmeyanov Institute of the Organoelement Compounds of the Russian Academy of Sciences, Vavilova Str., 28, 119991 Moscow, Russia; (A.V.V.); (V.A.O.); (A.V.M.); (A.S.C.); (S.V.D.)
| | - Valentina A. Olshevskaya
- Nesmeyanov Institute of the Organoelement Compounds of the Russian Academy of Sciences, Vavilova Str., 28, 119991 Moscow, Russia; (A.V.V.); (V.A.O.); (A.V.M.); (A.S.C.); (S.V.D.)
| | - Anton V. Makarenkov
- Nesmeyanov Institute of the Organoelement Compounds of the Russian Academy of Sciences, Vavilova Str., 28, 119991 Moscow, Russia; (A.V.V.); (V.A.O.); (A.V.M.); (A.S.C.); (S.V.D.)
| | | | - Alexander S. Chuprin
- Nesmeyanov Institute of the Organoelement Compounds of the Russian Academy of Sciences, Vavilova Str., 28, 119991 Moscow, Russia; (A.V.V.); (V.A.O.); (A.V.M.); (A.S.C.); (S.V.D.)
| | - Mikhail A. Vershinin
- Nikolaev Institute of Inorganic Chemistry of the Siberian Branch of the Russian Academy of Sciences, 3 Lavrentieva prosp., 630090 Novosibirsk, Russia;
| | - Semyon V. Dudkin
- Nesmeyanov Institute of the Organoelement Compounds of the Russian Academy of Sciences, Vavilova Str., 28, 119991 Moscow, Russia; (A.V.V.); (V.A.O.); (A.V.M.); (A.S.C.); (S.V.D.)
| | - Yan Z. Voloshin
- Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, Leninskii pr., 31, 119991 Moscow, Russia; (G.E.Z.); (I.P.L.)
- Nesmeyanov Institute of the Organoelement Compounds of the Russian Academy of Sciences, Vavilova Str., 28, 119991 Moscow, Russia; (A.V.V.); (V.A.O.); (A.V.M.); (A.S.C.); (S.V.D.)
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Nie X, Jiang C, Wu S, Chen W, Lv P, Wang Q, Liu J, Narh C, Cao X, Ghiladi RA, Wei Q. Carbon quantum dots: A bright future as photosensitizers for in vitro antibacterial photodynamic inactivation. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY. B, BIOLOGY 2020; 206:111864. [PMID: 32247250 DOI: 10.1016/j.jphotobiol.2020.111864] [Citation(s) in RCA: 41] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2019] [Revised: 03/07/2020] [Accepted: 03/19/2020] [Indexed: 02/04/2023]
Abstract
Carbon nanomaterials have increasingly gained the attention of the nano-, photo- and biomedical communities owing to their unique photophysical properties. Here, we facilely synthesized carbon quantum dots (CQDs) in a one-pot solvothermal reaction, and demonstrated their utility as photosensitizers for in vitro antibacterial photodynamic inactivation (aPDI). The bottom-up synthesis employed inexpensive and sustainable starting materials (citric acid), used ethanol as an environmentally-friendly solvent, was relatively energy efficient, produced minimal waste, and purification was accomplished simply by filtration. The CQDs were characterized by both physical (TEM, X-ray diffraction) and spectroscopic (UV-visible, fluorescence, and ATR-FTIR) methods, which together confirmed their nanoscale dimensions and photophysical properties. aPDI studies demonstrated detection limit inactivation (99.9999 + %) of Gram-negative Escherichia coli 8099 and Gram-positive Staphylococcus aureus ATCC-6538 upon visible light illumination (λ ≥ 420 nm, 65 ± 5 mW/cm2; 60 min). Post-illumination SEM images of the bacteria incubated with the CQDs showed perforated and fragmented cell membranes consistent with damage from reactive oxygen species (ROS), and mechanistic studies revealed that the bacteria were inactivated by singlet oxygen, with no discernable roles for other ROS (e.g., superoxide or hydroxyl radicals). These findings demonstrated that CQDs can be facilely prepared, operate via a Type II mechanism, and are effective photosensitizers for in vitro aPDI.
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Affiliation(s)
- Xiaolin Nie
- Key Laboratory of Eco-Textiles, Ministry of Education, Jiangnan University, Wuxi 214122, China
| | - Chenyu Jiang
- Department of Chemistry, North Carolina State University, Raleigh, NC 27695, USA
| | - Shuanglin Wu
- Key Laboratory of Eco-Textiles, Ministry of Education, Jiangnan University, Wuxi 214122, China
| | - Wangbingfei Chen
- Key Laboratory of Eco-Textiles, Ministry of Education, Jiangnan University, Wuxi 214122, China
| | - Pengfei Lv
- Key Laboratory of Eco-Textiles, Ministry of Education, Jiangnan University, Wuxi 214122, China
| | - Qingqing Wang
- Key Laboratory of Eco-Textiles, Ministry of Education, Jiangnan University, Wuxi 214122, China
| | - Jingyan Liu
- Key Laboratory of Eco-Textiles, Ministry of Education, Jiangnan University, Wuxi 214122, China
| | - Christopher Narh
- Key Laboratory of Eco-Textiles, Ministry of Education, Jiangnan University, Wuxi 214122, China
| | - Xiuming Cao
- Jiangsu Sunshine Group Co., Ltd., Jiangyin 214122, China
| | - Reza A Ghiladi
- Key Laboratory of Eco-Textiles, Ministry of Education, Jiangnan University, Wuxi 214122, China; Department of Chemistry, North Carolina State University, Raleigh, NC 27695, USA.
| | - Qufu Wei
- Key Laboratory of Eco-Textiles, Ministry of Education, Jiangnan University, Wuxi 214122, China; Fujian Key Laboratory of Novel Functional Textile Fibers and Materials, Minjiang University, Fuzhou, Fujian 350108, China.
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Ol’shevskaya VA, Kononova EG, Zaitsev AV. Fluorinated maleimide-substituted porphyrins and chlorins: synthesis and characterization. Beilstein J Org Chem 2019; 15:2704-2709. [PMID: 31807205 PMCID: PMC6880841 DOI: 10.3762/bjoc.15.263] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Accepted: 10/29/2019] [Indexed: 11/23/2022] Open
Abstract
Maleimide-containing fluorinated porphyrins and chlorins were prepared based on the reaction of Zn(II) or Ni(II) complexes of 5,10,15,20-tetrakis(4-amino-2,3,5,6-tetrafluorophenyl)porphyrin and chlorin with maleic anhydride. Porphyrin maleimide derivatives were also prepared by the reaction of 5,10,15,20-tetrakis(4-azido-2,3,5,6-tetrafluorophenyl)porphyrinato Zn(II) or Ni(II) with N-propargylmaleimide via the CuAAC click reaction to afford fluorinated porphyrin-triazole-maleimide conjugates. New maleimide derivatives were isolated in reasonable yields and identified by UV-vis, 1H NMR, 19F NMR spectroscopy and mass-spectrometry.
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Affiliation(s)
- Valentina A Ol’shevskaya
- A. N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences, 119991, Vavilova St. 28, Moscow, Russian Federation
| | - Elena G Kononova
- A. N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences, 119991, Vavilova St. 28, Moscow, Russian Federation
| | - Andrei V Zaitsev
- A. N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences, 119991, Vavilova St. 28, Moscow, Russian Federation
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Zelinskii GE, Belov AS, Vologzhanina AV, Limarev IP, Pavlov AA, Olshevskaya VA, Makarenkov AV, Dorovatovskii PV, Lebed EG, Voloshin YZ. Iron(II) Clathrochelate with Terminal Triple C≡C Bond and Its Carboranoclathrochelate Derivative with a Flexible Linker between the Polyhedral Cages: Synthesis and X‐Ray Structure. ChemistrySelect 2019. [DOI: 10.1002/slct.201902888] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Genrikh E. Zelinskii
- Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, 31 Leninsky Prosp. 119991 Moscow Russia
- Nesmeyanov Institute of Organoelement Compounds of the Russian Academy of Sciences, 28 Vavilova St. 119991 Moscow Russia
| | - Alexander S. Belov
- Nesmeyanov Institute of Organoelement Compounds of the Russian Academy of Sciences, 28 Vavilova St. 119991 Moscow Russia
| | - Anna V. Vologzhanina
- Nesmeyanov Institute of Organoelement Compounds of the Russian Academy of Sciences, 28 Vavilova St. 119991 Moscow Russia
| | - Ilya P. Limarev
- Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, 31 Leninsky Prosp. 119991 Moscow Russia
- Nesmeyanov Institute of Organoelement Compounds of the Russian Academy of Sciences, 28 Vavilova St. 119991 Moscow Russia
| | - Alexander A. Pavlov
- Nesmeyanov Institute of Organoelement Compounds of the Russian Academy of Sciences, 28 Vavilova St. 119991 Moscow Russia
| | - Valentina A. Olshevskaya
- Nesmeyanov Institute of Organoelement Compounds of the Russian Academy of Sciences, 28 Vavilova St. 119991 Moscow Russia
| | - Anton V. Makarenkov
- Nesmeyanov Institute of Organoelement Compounds of the Russian Academy of Sciences, 28 Vavilova St. 119991 Moscow Russia
| | | | - Ekaterina G. Lebed
- Nesmeyanov Institute of Organoelement Compounds of the Russian Academy of Sciences, 28 Vavilova St. 119991 Moscow Russia
| | - Yan Z. Voloshin
- Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, 31 Leninsky Prosp. 119991 Moscow Russia
- Nesmeyanov Institute of Organoelement Compounds of the Russian Academy of Sciences, 28 Vavilova St. 119991 Moscow Russia
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Porphyrinoid photosensitizers mediated photodynamic inactivation against bacteria. Eur J Med Chem 2019; 175:72-106. [PMID: 31096157 DOI: 10.1016/j.ejmech.2019.04.057] [Citation(s) in RCA: 95] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2018] [Revised: 12/27/2018] [Accepted: 04/19/2019] [Indexed: 12/28/2022]
Abstract
The multi-drug resistant bacteria have become a serious problem complicating therapies to such a degree that often the term "post-antibiotic era" is applied to describe the situation. The infections with methicillin-resistant S. aureus, vancomycin-resistant E. faecium, third generation cephalosporin-resistant E. coli, third generation cephalosporin-resistant K. pneumoniae and carbapenem-resistant P. aeruginosa have become commonplace. Thus, the new strategies of infection treatment have been searched for, and one of the approaches is based on photodynamic antimicrobial chemotherapy. Photodynamic protocols require the interaction of photosensitizer, molecular oxygen and light. The aim of this review is to provide a comprehensive overview of photodynamic antimicrobial chemotherapy by porphyrinoid photosensitizers. In the first part of the review information on the mechanism of photodynamic action and the mechanism of the bacteria resistance to the photodynamic technique were described. In the second one, it was described porphyrinoids photosensitizers like: porphyrins, chlorins and phthalocyanines useable in photodynamic bacteria inactivation.
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Silva AF, Borges A, Freitas CF, Hioka N, Mikcha JMG, Simões M. Antimicrobial Photodynamic Inactivation Mediated by Rose Bengal and Erythrosine Is Effective in the Control of Food-Related Bacteria in Planktonic and Biofilm States. Molecules 2018; 23:molecules23092288. [PMID: 30205468 PMCID: PMC6225188 DOI: 10.3390/molecules23092288] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2018] [Revised: 08/28/2018] [Accepted: 09/05/2018] [Indexed: 12/19/2022] Open
Abstract
The thermal and chemical-based methods applied for microbial control in the food industry are not always environmentally friendly and may change the nutritional and organoleptic characteristics of the final products. Moreover, the efficacy of sanitizing agents may be reduced when microbial cells are enclosed in biofilms. The objective of this study was to investigate the effect of photodynamic inactivation, using two xanthene dyes (rose bengal and erythrosine) as photosensitizing agents and green LED as a light source, against Staphylococcus aureus, Listeria innocua, Enterococcus hirae and Escherichia coli in both planktonic and biofilm states. Both photosensitizing agents were able to control planktonic cells of all bacteria tested. The treatments altered the physicochemical properties of cells surface and also induced potassium leakage, indicating damage of cell membranes. Although higher concentrations of the photosensitizing agents (ranging from 0.01 to 50.0 μmol/L) were needed to be applied, the culturability of biofilm cells was reduced to undetectable levels. This finding was confirmed by the live/dead staining, where propidium iodide-labeled bacteria numbers reached up to 100%. The overall results demonstrated that photoinactivation by rose bengal and erythrosine may be a powerful candidate for the control of planktonic cells and biofilms in the food sector.
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Affiliation(s)
- Alex Fiori Silva
- Postgraduate Program of Health Sciences, State University of Maringá, Av. Colombo, 5790, Maringá 87020-900, Paraná, Brazil.
- LEPABE, Department of Chemical Engineering, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, s/n, 4200-465 Porto, Portugal.
| | - Anabela Borges
- LEPABE, Department of Chemical Engineering, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, s/n, 4200-465 Porto, Portugal.
| | - Camila Fabiano Freitas
- Department of Chemistry, State University of Maringa, Av. Colombo, 5790, Maringá 87020-900, Paraná, Brazil.
| | - Noboru Hioka
- Department of Chemistry, State University of Maringa, Av. Colombo, 5790, Maringá 87020-900, Paraná, Brazil.
| | - Jane Martha Graton Mikcha
- Postgraduate Program of Health Sciences, State University of Maringá, Av. Colombo, 5790, Maringá 87020-900, Paraná, Brazil.
| | - Manuel Simões
- LEPABE, Department of Chemical Engineering, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, s/n, 4200-465 Porto, Portugal.
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Xu F, Li Y, Ahmad J, Wang Y, Scott DE, Vostal JG. Vitamin K5 is an efficient photosensitizer for ultraviolet A light inactivation of bacteria. FEMS Microbiol Lett 2018; 365:4810545. [DOI: 10.1093/femsle/fny005] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2017] [Accepted: 01/12/2018] [Indexed: 12/12/2022] Open
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Mitochondria-targeted antioxidants as highly effective antibiotics. Sci Rep 2017; 7:1394. [PMID: 28469140 PMCID: PMC5431119 DOI: 10.1038/s41598-017-00802-8] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2016] [Accepted: 03/13/2017] [Indexed: 12/17/2022] Open
Abstract
Mitochondria-targeted antioxidants are known to alleviate mitochondrial oxidative damage that is associated with a variety of diseases. Here, we showed that SkQ1, a decyltriphenyl phosphonium cation conjugated to a quinone moiety, exhibited strong antibacterial activity towards Gram-positive Bacillus subtilis, Mycobacterium sp. and Staphylococcus aureus and Gram-negative Photobacterium phosphoreum and Rhodobacter sphaeroides in submicromolar and micromolar concentrations. SkQ1 exhibited less antibiotic activity towards Escherichia coli due to the presence of the highly effective multidrug resistance pump AcrAB-TolC. E. coli mutants lacking AcrAB-TolC showed similar SkQ1 sensitivity, as B. subtilis. Lowering of the bacterial membrane potential by SkQ1 might be involved in the mechanism of its bactericidal action. No significant cytotoxic effect on mammalian cells was observed at bacteriotoxic concentrations of SkQ1. Therefore, SkQ1 may be effective in protection of the infected mammals by killing invading bacteria.
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Campos VR, Gomes ATPC, Cunha AC, Neves MDGPMS, Ferreira VF, Cavaleiro JAS. Efficient access to β -vinylporphyrin derivatives via palladium cross coupling of β-bromoporphyrins with N-tosylhydrazones. Beilstein J Org Chem 2017; 13:195-202. [PMID: 28228860 PMCID: PMC5301804 DOI: 10.3762/bjoc.13.22] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2016] [Accepted: 01/11/2017] [Indexed: 12/30/2022] Open
Abstract
This work describes a new approach to obtain new β-vinylporphyrin derivatives through palladium-catalyzed cross-coupling reaction of 2-bromo-5,10,15,20-tetraphenylporphyrinatozinc(II) with N-tosylhydrazones. This is the first report of the use of such synthetic methodology in porphyrin chemistry allowing the synthesis of new derivatives, containing β-arylvinyl substituents.
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Affiliation(s)
- Vinicius R Campos
- Departamento de Química Orgânica, Instituto de Química, Universidade Federal Fluminense, 24020-150 Niterói, RJ, Brazil; QOPNA and Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Ana T P C Gomes
- QOPNA and Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Anna C Cunha
- Departamento de Química Orgânica, Instituto de Química, Universidade Federal Fluminense, 24020-150 Niterói, RJ, Brazil
| | | | - Vitor F Ferreira
- Departamento de Química Orgânica, Instituto de Química, Universidade Federal Fluminense, 24020-150 Niterói, RJ, Brazil
| | - José A S Cavaleiro
- QOPNA and Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal
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