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Tanneau L, Karlsson MO, Svensson EM. Understanding the drug exposure-response relationship of bedaquiline to predict efficacy for novel dosing regimens in the treatment of multidrug-resistant tuberculosis. Br J Clin Pharmacol 2020; 86:913-922. [PMID: 31840278 PMCID: PMC7163373 DOI: 10.1111/bcp.14199] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2019] [Revised: 11/22/2019] [Accepted: 11/29/2019] [Indexed: 12/30/2022] Open
Abstract
AIMS To externally validate an earlier characterized relationship between bedaquiline exposure and decline in bacterial load in a more difficult-to-treat patient population, and to explore the performances of alternative dosing regimens through simulations. METHODS The bedaquiline exposure-response relationship was validated using time-to-positivity data from 233 newly diagnosed or treatment-experienced patients with drug-resistant tuberculosis from the C209 open-label study. The significance of the exposure-response relationship on the bacterial clearance was compared to a constant drug effect model. Tuberculosis resistance type and the presence and duration of antituberculosis pre-treatment were evaluated as additional covariates. Alternative dosing regimens were simulated for tuberculosis patients with different types of drug resistance. RESULTS High bedaquiline concentrations were confirmed to be associated with faster bacterial load decline in patients, given that the exposure-effect relationship provided a significantly better fit than the constant drug effect (relative likelihood = 0.0003). The half-life of bacterial clearance was identified to be 22% longer in patients with pre-extensively drug-resistant (pre-XDR) tuberculosis (TB) and 86% longer in patients with extensively drug-resistant (XDR) TB, compared to patients with multidrug-resistant (MDR) TB. Achievement of the same treatment response for (pre-)XDR TB patients as for MDR TB patients would be possible by adjusting the dose and dosing frequency. Furthermore, daily bedaquiline administration as in the ZeNix regimen, was predicted to be as effective as the approved regimen. CONCLUSION The confirmed bedaquiline exposure-response relationship offers the possibility to predict efficacy under alternative dosing regimens, and provides a useful tool for potential treatment optimization.
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Affiliation(s)
- Lénaïg Tanneau
- Department of Pharmaceutical BiosciencesUppsala UniversityUppsalaSweden
| | - Mats O. Karlsson
- Department of Pharmaceutical BiosciencesUppsala UniversityUppsalaSweden
| | - Elin M. Svensson
- Department of Pharmaceutical BiosciencesUppsala UniversityUppsalaSweden
- Department of Pharmacy, Radboud Institute for Health SciencesRadboud University Medical CenterNijmegenthe Netherlands
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102
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Fan Y, Li XD, He PP, Hu XX, Zhang K, Fan JQ, Yang PP, Zheng HY, Tian W, Chen ZM, Ji L, Wang H, Wang L. A biomimetic peptide recognizes and traps bacteria in vivo as human defensin-6. SCIENCE ADVANCES 2020; 6:eaaz4767. [PMID: 32494712 PMCID: PMC7209993 DOI: 10.1126/sciadv.aaz4767] [Citation(s) in RCA: 67] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2019] [Accepted: 02/27/2020] [Indexed: 05/18/2023]
Abstract
Using broad-spectrum antibiotics for microbial infection may cause flora disequilibrium, drug-resistance, etc., seriously threatening human health. Here, we design a human defensin-6 mimic peptide (HDMP) that inhibits bacterial invasion in vivo through mimicking the mechanisms of human defensin-6 with high efficiency and precision. The HDMP with ligand and self-assembling peptide sequence recognizes bacteria through ligand-receptor interactions and subsequently traps bacteria by an in situ adaptive self-assembly process and resulting nanofibrous networks; these trapped bacteria are unable to invade host cells. In four animal infection models, the infection rate was markedly decreased. Notably, administration of HDMP (5 mg/kg) nanoparticles increased the survival rate of mice with methicillin-resistant S. aureus bacteremia by as much as 100%, even more than that of vancomycin treatment (5 mg/kg, 83.3%)-treated group, the golden standard of antibiotics. This biomimetic peptide shows great potential as a precise and highly efficient antimicrobial agent.
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Affiliation(s)
- Yu Fan
- Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education and Hubei Key Laboratory of Catalysis and Materials Science, South-Central University for Nationalities, 182 Minzu Road, Hongshan District, Wuhan, Hubei 430074, P.R. China
- CAS Center for Excellence in Nanoscience, CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, National Center for Nanoscience and Technology (NCNST), No. 11 Beiyitiao, Zhongguancun, Haidian District, Beijing 100190, P.R. China
| | - Xiang-Dan Li
- Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education and Hubei Key Laboratory of Catalysis and Materials Science, South-Central University for Nationalities, 182 Minzu Road, Hongshan District, Wuhan, Hubei 430074, P.R. China
| | - Ping-Ping He
- Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education and Hubei Key Laboratory of Catalysis and Materials Science, South-Central University for Nationalities, 182 Minzu Road, Hongshan District, Wuhan, Hubei 430074, P.R. China
- CAS Center for Excellence in Nanoscience, CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, National Center for Nanoscience and Technology (NCNST), No. 11 Beiyitiao, Zhongguancun, Haidian District, Beijing 100190, P.R. China
| | - Xiao-Xue Hu
- CAS Center for Excellence in Nanoscience, CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, National Center for Nanoscience and Technology (NCNST), No. 11 Beiyitiao, Zhongguancun, Haidian District, Beijing 100190, P.R. China
| | - Kuo Zhang
- CAS Center for Excellence in Nanoscience, CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, National Center for Nanoscience and Technology (NCNST), No. 11 Beiyitiao, Zhongguancun, Haidian District, Beijing 100190, P.R. China
| | - Jia-Qi Fan
- Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education and Hubei Key Laboratory of Catalysis and Materials Science, South-Central University for Nationalities, 182 Minzu Road, Hongshan District, Wuhan, Hubei 430074, P.R. China
- CAS Center for Excellence in Nanoscience, CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, National Center for Nanoscience and Technology (NCNST), No. 11 Beiyitiao, Zhongguancun, Haidian District, Beijing 100190, P.R. China
| | - Pei-Pei Yang
- CAS Center for Excellence in Nanoscience, CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, National Center for Nanoscience and Technology (NCNST), No. 11 Beiyitiao, Zhongguancun, Haidian District, Beijing 100190, P.R. China
| | - Hao-Yan Zheng
- CAS Center for Excellence in Nanoscience, CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, National Center for Nanoscience and Technology (NCNST), No. 11 Beiyitiao, Zhongguancun, Haidian District, Beijing 100190, P.R. China
| | - Wen Tian
- CAS Center for Excellence in Nanoscience, CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, National Center for Nanoscience and Technology (NCNST), No. 11 Beiyitiao, Zhongguancun, Haidian District, Beijing 100190, P.R. China
| | - Zi-Ming Chen
- CAS Center for Excellence in Nanoscience, CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, National Center for Nanoscience and Technology (NCNST), No. 11 Beiyitiao, Zhongguancun, Haidian District, Beijing 100190, P.R. China
| | - Lei Ji
- CAS Center for Excellence in Nanoscience, CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, National Center for Nanoscience and Technology (NCNST), No. 11 Beiyitiao, Zhongguancun, Haidian District, Beijing 100190, P.R. China
| | - Hao Wang
- CAS Center for Excellence in Nanoscience, CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, National Center for Nanoscience and Technology (NCNST), No. 11 Beiyitiao, Zhongguancun, Haidian District, Beijing 100190, P.R. China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, P.R. China
| | - Lei Wang
- CAS Center for Excellence in Nanoscience, CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, National Center for Nanoscience and Technology (NCNST), No. 11 Beiyitiao, Zhongguancun, Haidian District, Beijing 100190, P.R. China
- Corresponding author.
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103
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Yang B, Gao F, Li Z, Li M, Chen L, Guan Y, Liu G, Yang L. Selective Entropy Gain-Driven Adsorption of Nanospheres onto Spherical Bacteria Endows Photodynamic Treatment with Narrow-Spectrum Activity. J Phys Chem Lett 2020; 11:2788-2796. [PMID: 32191475 DOI: 10.1021/acs.jpclett.0c00287] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Narrow-spectrum antimicrobials specifically eradicate the target pathogens but suffer from significantly lagging development. Photodynamic therapy eliminates cells with reactive oxygen species (ROS) generated upon light irradiation but is intrinsically a wide-spectrum modality. We herein converted photodynamic therapy into a narrow-spectrum modality by taking advantage of a previously unnoticed physics recognition pathway. We found that negatively charged nanospheres undergo selective entropy gain-driven adsorption onto spherical bacteria, but not onto rod-like bacteria. This bacterial morphology-targeting selectivity, combined with the extremely limited effective radii of action of ROS, enabled photodynamic nanospheres to kill >99% of inoculated spherical bacteria upon light irradiation and <1% of rod-like bacteria under comparable conditions, indicative of narrow-spectrum activity against spherical bacteria. This work unveils the bacterial morphology selectivity in the adsorption of negatively charged nanospheres and suggests a new approach for treating infections characterized by overthriving spherical bacteria in niches naturally dominated by rod-like bacteria.
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104
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Velázquez-Lam E, Imperial J, Ponz F. Polyphenol-Functionalized Plant Viral-Derived Nanoparticles Exhibit Strong Antimicrobial and Antibiofilm Formation Activities. ACS APPLIED BIO MATERIALS 2020; 3:2040-2047. [DOI: 10.1021/acsabm.9b01161] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Edith Velázquez-Lam
- Centro de Biotecnología y Genómica de Plantas, Universidad Politécnica de Madrid-Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (CBGP, UPM-INIA), Campus Montegancedo, Autopista M-40, km 38, Pozuelo de Alarcón, 28223 Madrid, Spain
- Doctorado en Biotecnología y Recursos Genéticos de Plantas y Microorganismos Asociados, ETSI Agronómica, Alimentaria y de Biosistemas, Universidad Politécnica de Madrid, 28040 Madrid, Spain
| | - Juan Imperial
- Instituto de Ciencias Agrarias, CSIC, Serrano 115bis, 28006 Madrid, Spain
| | - Fernando Ponz
- Centro de Biotecnología y Genómica de Plantas, Universidad Politécnica de Madrid-Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (CBGP, UPM-INIA), Campus Montegancedo, Autopista M-40, km 38, Pozuelo de Alarcón, 28223 Madrid, Spain
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105
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Ferraz R, Silva D, Dias AR, Dias V, Santos MM, Pinheiro L, Prudêncio C, Noronha JP, Petrovski Ž, Branco LC. Synthesis and Antibacterial Activity of Ionic Liquids and Organic Salts Based on Penicillin G and Amoxicillin hydrolysate Derivatives against Resistant Bacteria. Pharmaceutics 2020; 12:pharmaceutics12030221. [PMID: 32131540 PMCID: PMC7150922 DOI: 10.3390/pharmaceutics12030221] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2019] [Revised: 02/19/2020] [Accepted: 02/19/2020] [Indexed: 12/21/2022] Open
Abstract
The preparation and characterization of ionic liquids and organic salts (OSILs) that contain anionic penicillin G [secoPen] and amoxicillin [seco-Amx] hydrolysate derivatives and their in vitro antibacterial activity against sensitive and resistant Escherichia coli and Staphylococcus aureus strains is reported. Eleven hydrolyzed β-lactam-OSILs were obtained after precipitation in moderate-to-high yields via the neutralization of the basic ammonia buffer of antibiotics with different cation hydroxide salts. The obtained minimum inhibitory concentration (MIC) data of the prepared compounds showed a relative decrease of the inhibitory concentrations (RDIC) in the order of 100 in the case of [C2OHMIM][seco-Pen] against sensitive S. aureus ATCC25923 and, most strikingly, higher than 1000 with [C16Pyr][seco-Amx] against methicillin-resistant Staphylococcus aureus (MRSA) ATCC 43300. These outstanding in vitro results showcase that a straightforward transformation of standard antibiotics into hydrolyzed organic salts can dramatically change the pharmaceutical activity of a drug, including giving rise to potent formulations of antibiotics against deadly bacteria strains.
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Affiliation(s)
- Ricardo Ferraz
- Ciências Químicas e das Biomoléculas (CQB) e Centro de Investigação em Saúde e Ambiente (CISA), Escola Superior de Saúde do Instituto Politécnico do Porto, 4400-330 Porto, Portugal; (A.R.D.); (V.D.); (C.P.)
- LAQV-REQUIMTE, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre 687, 4169-007 Porto, Portugal
- Correspondence: (R.F.); (Ž.P.); (L.C.B.)
| | - Dário Silva
- LAQV-REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa, 2829-516 Caparica, Portugal; (D.S.); (M.M.S.); (L.P.); (J.P.N.)
| | - Ana Rita Dias
- Ciências Químicas e das Biomoléculas (CQB) e Centro de Investigação em Saúde e Ambiente (CISA), Escola Superior de Saúde do Instituto Politécnico do Porto, 4400-330 Porto, Portugal; (A.R.D.); (V.D.); (C.P.)
- LAQV-REQUIMTE, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre 687, 4169-007 Porto, Portugal
| | - Vitorino Dias
- Ciências Químicas e das Biomoléculas (CQB) e Centro de Investigação em Saúde e Ambiente (CISA), Escola Superior de Saúde do Instituto Politécnico do Porto, 4400-330 Porto, Portugal; (A.R.D.); (V.D.); (C.P.)
| | - Miguel M. Santos
- LAQV-REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa, 2829-516 Caparica, Portugal; (D.S.); (M.M.S.); (L.P.); (J.P.N.)
| | - Luís Pinheiro
- LAQV-REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa, 2829-516 Caparica, Portugal; (D.S.); (M.M.S.); (L.P.); (J.P.N.)
| | - Cristina Prudêncio
- Ciências Químicas e das Biomoléculas (CQB) e Centro de Investigação em Saúde e Ambiente (CISA), Escola Superior de Saúde do Instituto Politécnico do Porto, 4400-330 Porto, Portugal; (A.R.D.); (V.D.); (C.P.)
- i3S, Instituto de Inovação e Investigação em Saúde, Universidade do Porto, 4099-002 Porto, Portugal
| | - João Paulo Noronha
- LAQV-REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa, 2829-516 Caparica, Portugal; (D.S.); (M.M.S.); (L.P.); (J.P.N.)
| | - Željko Petrovski
- LAQV-REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa, 2829-516 Caparica, Portugal; (D.S.); (M.M.S.); (L.P.); (J.P.N.)
- Correspondence: (R.F.); (Ž.P.); (L.C.B.)
| | - Luís C. Branco
- LAQV-REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa, 2829-516 Caparica, Portugal; (D.S.); (M.M.S.); (L.P.); (J.P.N.)
- Correspondence: (R.F.); (Ž.P.); (L.C.B.)
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106
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Sun Y, Zhao C, Niu J, Ren J, Qu X. Colorimetric Band-aids for Point-of-Care Sensing and Treating Bacterial Infection. ACS CENTRAL SCIENCE 2020; 6:207-212. [PMID: 32123738 PMCID: PMC7047266 DOI: 10.1021/acscentsci.9b01104] [Citation(s) in RCA: 64] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2019] [Indexed: 05/16/2023]
Abstract
Sensing bacterial infections and monitoring drug resistance are very important for the selection of treatment options. However, the common methods of sensing resistance are limited by time-consuming, the requirement for professional personnel, and expensive instruments. Moreover, the abuse of antibiotics causes the accelerated process of bacterial resistance. Herein, we construct a portable paper-based band-aid (PBA) which implements a selective antibacterial strategy after sensing of drug resistance. The colors of PBA indicate bacterial infection (yellow) and drug resistance (red), just like a bacterial resistance colorimetric card. On the basis of color, antibiotic-based chemotherapy and Zr-MOF PCN-224-based photodynamic therapy (PDT) are used on site to treat sensitive and resistant strains, respectively. Eventually, it takes 4 h to sense, and the limit of detection is 104 CFU/mL for drug-resistant E. coli. Compared with traditional PDT-based antibacterial strategies, our design can alleviate off-target side effects, maximize therapeutic efficacy, and track the drug resistance in real time with the naked eye. This work develops a new way for the rational use of antibiotics. Given the low cost and easy operation of this point-of-care device, it can be developed for practical applications.
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Affiliation(s)
- Yuhuan Sun
- Laboratory
of Chemical Biology and State Key Laboratory of Rare Earth Resource
Utilization, Changchun Institute of Applied
Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, China
- School
of Applied Chemistry and Engineering, University
of Science and Technology of China, Hefei, Anhui 230026, China
| | - Chuanqi Zhao
- Laboratory
of Chemical Biology and State Key Laboratory of Rare Earth Resource
Utilization, Changchun Institute of Applied
Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, China
- E-mail:
| | - Jingsheng Niu
- Laboratory
of Chemical Biology and State Key Laboratory of Rare Earth Resource
Utilization, Changchun Institute of Applied
Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, China
- School
of Applied Chemistry and Engineering, University
of Science and Technology of China, Hefei, Anhui 230026, China
| | - Jinsong Ren
- Laboratory
of Chemical Biology and State Key Laboratory of Rare Earth Resource
Utilization, Changchun Institute of Applied
Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, China
- School
of Applied Chemistry and Engineering, University
of Science and Technology of China, Hefei, Anhui 230026, China
| | - Xiaogang Qu
- Laboratory
of Chemical Biology and State Key Laboratory of Rare Earth Resource
Utilization, Changchun Institute of Applied
Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, China
- E-mail:
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107
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Kepiro IE, Marzuoli I, Hammond K, Ba X, Lewis H, Shaw M, Gunnoo SB, De Santis E, Łapińska U, Pagliara S, Holmes MA, Lorenz CD, Hoogenboom BW, Fraternali F, Ryadnov MG. Engineering Chirally Blind Protein Pseudocapsids into Antibacterial Persisters. ACS NANO 2020; 14:1609-1622. [PMID: 31794180 DOI: 10.1021/acsnano.9b06814] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Antimicrobial resistance stimulates the search for antimicrobial forms that may be less subject to acquired resistance. Here we report a conceptual design of protein pseudocapsids exhibiting a broad spectrum of antimicrobial activities. Unlike conventional antibiotics, these agents are effective against phenotypic bacterial variants, while clearing "superbugs" in vivo without toxicity. The design adopts an icosahedral architecture that is polymorphic in size, but not in shape, and that is available in both l and d epimeric forms. Using a combination of nanoscale and single-cell imaging we demonstrate that such pseudocapsids inflict rapid and irreparable damage to bacterial cells. In phospholipid membranes they rapidly convert into nanopores, which remain confined to the binding positions of individual pseudocapsids. This mechanism ensures precisely delivered influxes of high antimicrobial doses, rendering the design a versatile platform for engineering structurally diverse and functionally persistent antimicrobial agents.
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Affiliation(s)
- Ibolya E Kepiro
- National Physical Laboratory , Hampton Road , Teddington , TW11 0LW , U.K
| | - Irene Marzuoli
- National Physical Laboratory , Hampton Road , Teddington , TW11 0LW , U.K
- Randall Centre for Cell and Molecular Biophysics , King's College London , London , SE1 1UL , U.K
| | - Katharine Hammond
- National Physical Laboratory , Hampton Road , Teddington , TW11 0LW , U.K
- Department of Physics and Astronomy , University College London , London , WC1E 6BT , U.K
- London Centre for Nanotechnology , University College London , London , WC1H 0AH , U.K
| | - Xiaoliang Ba
- Department of Veterinary Medicine , University of Cambridge , Cambridge , CB3 0ES , U.K
| | - Helen Lewis
- National Physical Laboratory , Hampton Road , Teddington , TW11 0LW , U.K
| | - Michael Shaw
- National Physical Laboratory , Hampton Road , Teddington , TW11 0LW , U.K
- Department of Computer Science , University College London , London , WC1 6BT , U.K
| | - Smita B Gunnoo
- National Physical Laboratory , Hampton Road , Teddington , TW11 0LW , U.K
| | - Emiliana De Santis
- National Physical Laboratory , Hampton Road , Teddington , TW11 0LW , U.K
| | - Urszula Łapińska
- Living Systems Institute , University of Exeter , Exeter , EX4 4QD , U.K
| | - Stefano Pagliara
- Living Systems Institute , University of Exeter , Exeter , EX4 4QD , U.K
| | - Mark A Holmes
- Department of Veterinary Medicine , University of Cambridge , Cambridge , CB3 0ES , U.K
| | - Christian D Lorenz
- Department of Physics , King's College London , Strand Lane , London , WC2R 2LS , U.K
| | - Bart W Hoogenboom
- Department of Physics and Astronomy , University College London , London , WC1E 6BT , U.K
- London Centre for Nanotechnology , University College London , London , WC1H 0AH , U.K
| | - Franca Fraternali
- Randall Centre for Cell and Molecular Biophysics , King's College London , London , SE1 1UL , U.K
| | - Maxim G Ryadnov
- National Physical Laboratory , Hampton Road , Teddington , TW11 0LW , U.K
- Department of Physics , King's College London , Strand Lane , London , WC2R 2LS , U.K
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Zhao Y, Lv B, Sun F, Liu J, Wang Y, Gao Y, Qi F, Chang Z, Fu X. Rapid Freezing Enables Aminoglycosides To Eradicate Bacterial Persisters via Enhancing Mechanosensitive Channel MscL-Mediated Antibiotic Uptake. mBio 2020; 11:e03239-19. [PMID: 32047133 PMCID: PMC7018644 DOI: 10.1128/mbio.03239-19] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Accepted: 01/06/2020] [Indexed: 12/24/2022] Open
Abstract
Bacterial persisters exhibit noninherited antibiotic tolerance and are linked to the recalcitrance of bacterial infections. It is very urgent but also challenging to develop antipersister strategies. Here, we report that 10-s freezing with liquid nitrogen dramatically enhances the bactericidal action of aminoglycoside antibiotics by 2 to 6 orders of magnitude against many Gram-negative pathogens, with weaker potentiation effects on Gram-positive bacteria. In particular, antibiotic-tolerant Escherichia coli and Pseudomonas aeruginosa persisters-which were prepared by treating exponential-phase cells with ampicillin, ofloxacin, the protonophore cyanide m-chlorophenyl hydrazone (CCCP), or bacteriostatic antibiotics-can be effectively killed. We demonstrated, as a proof of concept, that freezing potentiated the aminoglycosides' killing of P. aeruginosa persisters in a mouse acute skin wound model. Mechanistically, freezing dramatically increased the bacterial uptake of aminoglycosides regardless of the presence of CCCP, indicating that the effects are independent of the proton motive force (PMF). In line with these results, we found that the effects were linked to freezing-induced cell membrane damage and were attributable, at least partly, to the mechanosensitive ion channel MscL, which was able to directly mediate such freezing-enhanced aminoglycoside uptake. In view of these results, we propose that the freezing-induced aminoglycoside potentiation is achieved by freezing-induced cell membrane destabilization, which, in turn, activates the MscL channel, which is able to effectively take up aminoglycosides in a PMF-independent manner. Our work may pave the way for the development of antipersister strategies that utilize the same mechanism as freezing but do so without causing any injury to animal cells.IMPORTANCE Antibiotics have long been used to successfully kill bacterial pathogens, but antibiotic resistance/tolerance usually has led to the failure of antibiotic therapy, and it has become a severe threat to human health. How to improve the efficacy of existing antibiotics is of importance for combating antibiotic-resistant/tolerant pathogens. Here, we report that 10-s rapid freezing with liquid nitrogen dramatically enhanced the bactericidal action of aminoglycoside antibiotics by 2 to 6 orders of magnitude against many bacterial pathogens in vitro and also in a mouse skin wound model. In particular, such combined treatment was able to effectively kill persister cells of Escherichia coli and Pseudomonas aeruginosa, which are per se tolerant of conventional treatment with bactericidal antibiotics for several hours. We also demonstrated that freezing-induced aminoglycoside potentiation was apparently linked to freezing-induced cell membrane damage that may have activated the mechanosensitive ion channel MscL, which, in turn, was able to effectively uptake aminoglycoside antibiotics in a proton motive force-independent manner. Our report sheds light on the development of a new strategy against bacterial pathogens by combining existing antibiotics with a conventional physical treatment or with MscL agonists.
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Affiliation(s)
- Yanna Zhao
- Provincial University Key Laboratory of Cellular Stress Response and Metabolic Regulation, Key Laboratory of Optoelectronic Science and Technology for Medicine of Ministry of Education, College of Life Sciences, Fujian Normal University, Fuzhou City, Fujian Province, China
| | - Boyan Lv
- Provincial University Key Laboratory of Cellular Stress Response and Metabolic Regulation, Key Laboratory of Optoelectronic Science and Technology for Medicine of Ministry of Education, College of Life Sciences, Fujian Normal University, Fuzhou City, Fujian Province, China
| | - Fengqi Sun
- Provincial University Key Laboratory of Cellular Stress Response and Metabolic Regulation, Key Laboratory of Optoelectronic Science and Technology for Medicine of Ministry of Education, College of Life Sciences, Fujian Normal University, Fuzhou City, Fujian Province, China
| | - Jiafeng Liu
- State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences, Peking University, Beijing, China
| | - Yan Wang
- Provincial University Key Laboratory of Cellular Stress Response and Metabolic Regulation, Key Laboratory of Optoelectronic Science and Technology for Medicine of Ministry of Education, College of Life Sciences, Fujian Normal University, Fuzhou City, Fujian Province, China
| | - Yuanyuan Gao
- Provincial University Key Laboratory of Cellular Stress Response and Metabolic Regulation, Key Laboratory of Optoelectronic Science and Technology for Medicine of Ministry of Education, College of Life Sciences, Fujian Normal University, Fuzhou City, Fujian Province, China
- Engineering Research Center of Industrial Microbiology of Ministry of Education, Fujian Normal University, Fuzhou City, Fujian Province, China
| | - Feng Qi
- Engineering Research Center of Industrial Microbiology of Ministry of Education, Fujian Normal University, Fuzhou City, Fujian Province, China
| | - Zengyi Chang
- State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences, Peking University, Beijing, China
| | - Xinmiao Fu
- Provincial University Key Laboratory of Cellular Stress Response and Metabolic Regulation, Key Laboratory of Optoelectronic Science and Technology for Medicine of Ministry of Education, College of Life Sciences, Fujian Normal University, Fuzhou City, Fujian Province, China
- Engineering Research Center of Industrial Microbiology of Ministry of Education, Fujian Normal University, Fuzhou City, Fujian Province, China
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Fan T, Guo W, Shao T, Zhou W, Hu P, Liu M, Chen Y, Yi Z. Design, synthesis and evaluation of phenylthiazole and phenylthiophene pyrimidindiamine derivatives targeting the bacterial membrane. Eur J Med Chem 2020; 190:112141. [PMID: 32078862 DOI: 10.1016/j.ejmech.2020.112141] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2019] [Revised: 02/10/2020] [Accepted: 02/10/2020] [Indexed: 01/17/2023]
Abstract
As the continuous rise in the incidence of antibiotic resistance, it is urgent to develop novel chemical scaffolds with antibacterial activities to control the spread of resistance to conventional antibiotics. In this study, a series of phenylthiazole and phenylthiophene pyrimidindiamine derivatives were designed and synthesized by modifying the hit compound (N2-isobutyl-N4-((4-methyl-2-phenylthiazol-5-yl)methyl) pyrimidine-2,4-diamine) and their antibacterial activities were evaluated both in vitro and in vivo. Among the tested compounds, compound 14g (N4-((5-(3-bromophenyl)thiophen-2-yl)methyl)-N2-isobutylpyrimidine-2,4-diamine) displayed the best antibacterial activities, which was not only capable of inhibiting E. coli and S. aureus growth at concentrations as low as 2 and 3 μg/mL in vitro, but also efficacious in a mice model of bacteremia in vivo. Unlike conventional antibiotics, compound 14g was elucidated to mainly destroy the bacterial cell membrane, with the dissipation of membrane potential and leakage of contents, ultimately leading to cell death. The destruction of cell structure is challenging to induce bacterial resistance, which suggested that compound 14g may be a kind of promising alternatives to antibiotics against bacteria.
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Affiliation(s)
- Tingting Fan
- East China Normal University and Shanghai Fengxian District Central Hospital Joint Center for Translational Medicine, Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences and School of Life Sciences, East China Normal University, 200241, Shanghai, China; Changzhi Medical College, Changzhi, 046000, Shanxi, China
| | - Weikai Guo
- East China Normal University and Shanghai Fengxian District Central Hospital Joint Center for Translational Medicine, Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences and School of Life Sciences, East China Normal University, 200241, Shanghai, China
| | - Ting Shao
- East China Normal University and Shanghai Fengxian District Central Hospital Joint Center for Translational Medicine, Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences and School of Life Sciences, East China Normal University, 200241, Shanghai, China
| | - Wenbo Zhou
- East China Normal University and Shanghai Fengxian District Central Hospital Joint Center for Translational Medicine, Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences and School of Life Sciences, East China Normal University, 200241, Shanghai, China
| | - Pan Hu
- East China Normal University and Shanghai Fengxian District Central Hospital Joint Center for Translational Medicine, Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences and School of Life Sciences, East China Normal University, 200241, Shanghai, China
| | - Mingyao Liu
- East China Normal University and Shanghai Fengxian District Central Hospital Joint Center for Translational Medicine, Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences and School of Life Sciences, East China Normal University, 200241, Shanghai, China
| | - Yihua Chen
- East China Normal University and Shanghai Fengxian District Central Hospital Joint Center for Translational Medicine, Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences and School of Life Sciences, East China Normal University, 200241, Shanghai, China.
| | - Zhengfang Yi
- East China Normal University and Shanghai Fengxian District Central Hospital Joint Center for Translational Medicine, Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences and School of Life Sciences, East China Normal University, 200241, Shanghai, China.
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Shikha S, Chaudhuri SR, Bhattacharyya MS. Facile One Pot Greener Synthesis of Sophorolipid Capped Gold Nanoparticles and its Antimicrobial Activity having Special Efficacy Against Gram Negative Vibrio cholerae. Sci Rep 2020; 10:1463. [PMID: 31996706 PMCID: PMC6989514 DOI: 10.1038/s41598-019-57399-3] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2018] [Accepted: 12/23/2019] [Indexed: 12/24/2022] Open
Abstract
Microbes develop several strategies to survive in the adverse condition such as biofilm formation, attaining non-dividing state, altering drug target or drug, thereby increases the burden of drug dosage. To combat these issues, nanoparticles have shown an alternative approach for new treatment strategy but synthesis via chemical synthetic route limits their application in biomedical field. Here, green method for the synthesis of gold nanoparticles using sophorolipid (SL) is discussed that is characterized by various techniques. Initially, the antimicrobial activity was checked against metabolically active state of microbes; Gram-positive Staphylococcus aureus and Gram-negative Vibrio cholerae using XTT assay and growth kinetics assay. Results suggested higher efficacy of nanoparticles for Gram-negative, therefore further analyzed against Escherichia coli that confirmed its potency for the same. AuNPs-SL also signifies its efficiency at least metabolically active state; non dividing cells and biofilm of these microbes. Induced morphological changes were studied by SEM that revealed AuNPs-SL led to disruption of cell membrane and leakage of intracellular fluid to the surroundings. Inhibition of respiratory enzymes activity also plays a crucial role in bactericidal action as indicated by LDH assay. Synergy of AuNPs-SL with different antibiotics was also analyzed using checkerboard assay. These results suggested the possible use of AuNPs-SL as an antimicrobial therapy in the field of nanomedicine.
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Affiliation(s)
- Sristy Shikha
- CSIR-Institute of Microbial Technology (IMTECH), Sector-39A, Chandigarh, 160036, India.
| | - Saumya Ray Chaudhuri
- CSIR-Institute of Microbial Technology (IMTECH), Sector-39A, Chandigarh, 160036, India
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Singu PS, Kanugala S, Dhawale SA, Kumar CG, Kumbhare RM. Synthesis and Pharmacological Evaluation of Some Amide Functionalized 1
H
‐Benzo[
d
]imidazole‐2‐thiol Derivatives as Antimicrobial Agents. ChemistrySelect 2020. [DOI: 10.1002/slct.201903380] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Padma S. Singu
- Department of Fluoro-AgrochemicalsCSIR-Indian Institute of Chemical Technology, Tarnaka Hyderabad 500007 India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad India
| | - Sirisha Kanugala
- Department of Organic Synthesis and Process ChemistryCSIR-Indian Institute of Chemical Technology, Tarnaka Hyderabad 500007, Telangana India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad India
| | - Sachin A. Dhawale
- Department of Pharmaceutical ChemistryY. B. Chavan College of PharmacyDr. Rafiq Zakaria Campus Aurangabad- 431001 India
| | - C. Ganesh Kumar
- Department of Organic Synthesis and Process ChemistryCSIR-Indian Institute of Chemical Technology, Tarnaka Hyderabad 500007, Telangana India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad India
| | - Ravindra M. Kumbhare
- Department of Fluoro-AgrochemicalsCSIR-Indian Institute of Chemical Technology, Tarnaka Hyderabad 500007 India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad India
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112
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Naikal James Prameela S, Jilla L, Vanguru S. Synthesis of novel piperazine tethered benzocycloheptenone hybrids and their antimicrobial evaluation. J Heterocycl Chem 2020. [DOI: 10.1002/jhet.3778] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
| | - Lavanya Jilla
- Department of Chemistry, University College of ScienceOsmania University Hyderabad Telangana India
| | - Sowmya Vanguru
- Department of Chemistry, University College of ScienceOsmania University Hyderabad Telangana India
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113
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Sima Z, Fadwa H, Basem D, Omar G, Ahmed AS. In vitro and in vivo Antibacterial Activity of Cheilocostus speciosus Rhizome Extract on Resistant Bacteria. Pak J Biol Sci 2020; 23:931-939. [PMID: 32700841 DOI: 10.3923/pjbs.2020.931.939] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
BACKGROUND AND OBJECTIVE Cheilocostus speciosus has traditionally been used in alternative medicine for different therapeutic purposes in different countries, including as an anti-infective agent. Antimicrobial properties of C. speciosus against standard bacterial strains have been reported before, however, complementary in vivo investigations, as well as, its antimicrobial activity against multi drug-resistant (MDR) bacteria are insufficient, if not lacking. In our study, in vitro and in vivo methods were used to test its antimicrobial activities on prominent clinical MDR isolates. MATERIALS AND METHODS Cheilocostus speciosus rhizome extracts (CSRE) were prepared using different solvents; methanol, hexane, petroleum ether, ethylene glycol and water. The bactericidal activity of CSRE was tested on methicillin resistant S. aureus (MRSA), A. baumannii, K. pneumoniae serotype K2 (Kp K2), MDR P. aeruginosa, S. typhimurium and MDR E. coli. The standard disc diffusion and the broth micro-dilution methods were used to confirm the efficacy of CSRE against the tested microorganisms. In vitro results proved a potent bactericidal effect on MRSA and Kp K2 and a pronounced bacteriostatic effect against E. coli. RESULTS We further confirmed the antibacterial activity of CSRE using BALB/c mice, animals were infected with Kp K2 or MRSA along with their standard strains; the extract was found to significantly reduce the bacterial load in mice lungs, liver and spleen. In addition, extracts were found to be more effective on the MDRs than the standard strains. CONCLUSION It is concluded that CSRE could be a potential source for new antibiotics, further investigations are required to identify the bioactive components.
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Amison RT, Faure ME, O'Shaughnessy BG, Bruce KD, Hu Y, Coates A, Page CP. The small quinolone derived compound HT61 enhances the effect of tobramycin against Pseudomonas aeruginosa in vitro and in vivo. Pulm Pharmacol Ther 2019; 61:101884. [PMID: 31887372 DOI: 10.1016/j.pupt.2019.101884] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/24/2019] [Accepted: 12/25/2019] [Indexed: 11/26/2022]
Abstract
HT61 is a small quinolone-derived compound previously demonstrated to exhibit bactericidal activity against gram-positive bacteria including methicillin-susceptible Staphylococcus aureus (MSSA) and methicillin-resistant Staphylococcus aureus (MRSA). When combined with the classical antibiotics and antiseptics neomycin, gentamicin, mupirocin and chlorhexidine, HT61 demonstrated synergistic bactericidal activity against both MSSA and MRSA infections in vitro. In this study, we investigated the individual antimicrobial activity of HT61 alongside its capability to potentiate the efficacy of tobramycin against both a tobramycin sensitive laboratory reference strain (PAO1) and tobramycin resistant clinical isolates (RP73, NN2) of the gram-negative bacteria Pseudomonas aeruginosa (P. aeruginosa). Using broth microdilution methods, the MICs of HT61 were assessed against all strains, as well as the effect of HT61 in combination with tobramycin using both the chequerboard method and bacterial time-kill assays. A murine model of pulmonary infection was also used to evaluate the combination therapy of tobramycin and HT61 in vivo. In these studies, we demonstrated significant synergism between HT61 and tobramycin against the tobramycin resistant P. aeruginosa strains RP73 and NN2, whilst an additive/intermediate effect was observed for P. aeruginosa strain PA01 which was further confirmed using bacterial time kill analysis. In addition, the enhancement of tobramycin by HT61 was also evident in in vitro assays of biofilm eradication. Finally, in vivo studies revealed analogous effects to those observed in vitro with HT61 significantly reducing bacterial load when administered in combination with tobramycin against each of the three P. aeruginosa strains at the highest tested dose (10 mg/kg).
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Affiliation(s)
- R T Amison
- Sackler Institute of Pulmonary Pharmacology, School of Cancer and Pharmaceutical Sciences, King's College London, London, SE1 9NH, UK.
| | - M-E Faure
- School of Cancer and Pharmaceutical Sciences, King's College London, London, SE1 9NH, UK
| | - B G O'Shaughnessy
- Sackler Institute of Pulmonary Pharmacology, School of Cancer and Pharmaceutical Sciences, King's College London, London, SE1 9NH, UK
| | - K D Bruce
- School of Cancer and Pharmaceutical Sciences, King's College London, London, SE1 9NH, UK
| | - Y Hu
- Institute of Infection and Immunity, St George's, University of London, Cranmer Terrace, London, SW17 ORE, UK
| | - A Coates
- Institute of Infection and Immunity, St George's, University of London, Cranmer Terrace, London, SW17 ORE, UK
| | - C P Page
- Sackler Institute of Pulmonary Pharmacology, School of Cancer and Pharmaceutical Sciences, King's College London, London, SE1 9NH, UK
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Dusane DH, Brooks JR, Sindeldecker D, Peters CW, Li A, Farrar NR, Diamond SM, Knecht CS, Plaut RD, Delury C, Aiken SS, Laycock PA, Sullivan A, Granger JF, Stoodley P. Complete Killing of Agar Lawn Biofilms by Systematic Spacing of Antibiotic-Loaded Calcium Sulfate Beads. MATERIALS 2019; 12:ma12244052. [PMID: 31817373 PMCID: PMC6947297 DOI: 10.3390/ma12244052] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/29/2019] [Revised: 11/27/2019] [Accepted: 11/29/2019] [Indexed: 12/21/2022]
Abstract
Background:Pseudomonas aeruginosa (PA) and Staphylococcus aureus (SA) are the major causative agents of acute and chronic infections. Antibiotic-loaded calcium sulfate beads (ALCSB) are used in the management of musculoskeletal infections such as periprosthetic joint infections (PJI). Methods: To determine whether the number and spatial distribution of ALCSB are important factors to totally eradicate biofilms, ALCSBs containing vancomycin and tobramycin were placed on 24 h agar lawn biofilms as a single bead in the center, or as 16 beads placed as four clusters of four, a ring around the edge and as a group in the center or 19 beads evenly across the plate. Bioluminescence was used to assess spatial metabolic activity in real time. Replica plating was used to assess viability. Results: For both strains antibiotics released from the beads completely killed biofilm bacteria in a zone immediately adjacent to each bead. However, for PA extended incubation revealed the emergence of resistant colony phenotypes between the zone of eradication and the background lawn. The rate of biofilm clearing was greater when the beads were distributed evenly over the plate. Conclusions: Both number and distribution pattern of ALCSB are important to ensure adequate coverage of antibiotics required to eradicate biofilms.
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Affiliation(s)
- Devendra H. Dusane
- Department of Microbial Infection and Immunity, The Ohio State University, Wexner Medical Center, Columbus, OH 43210, USA; (D.H.D.); (J.R.B.); (D.S.); (C.W.P.); (A.L.); (N.R.F.); (S.M.D.); (C.S.K.)
| | - Jacob R. Brooks
- Department of Microbial Infection and Immunity, The Ohio State University, Wexner Medical Center, Columbus, OH 43210, USA; (D.H.D.); (J.R.B.); (D.S.); (C.W.P.); (A.L.); (N.R.F.); (S.M.D.); (C.S.K.)
| | - Devin Sindeldecker
- Department of Microbial Infection and Immunity, The Ohio State University, Wexner Medical Center, Columbus, OH 43210, USA; (D.H.D.); (J.R.B.); (D.S.); (C.W.P.); (A.L.); (N.R.F.); (S.M.D.); (C.S.K.)
| | - Casey W. Peters
- Department of Microbial Infection and Immunity, The Ohio State University, Wexner Medical Center, Columbus, OH 43210, USA; (D.H.D.); (J.R.B.); (D.S.); (C.W.P.); (A.L.); (N.R.F.); (S.M.D.); (C.S.K.)
| | - Anthony Li
- Department of Microbial Infection and Immunity, The Ohio State University, Wexner Medical Center, Columbus, OH 43210, USA; (D.H.D.); (J.R.B.); (D.S.); (C.W.P.); (A.L.); (N.R.F.); (S.M.D.); (C.S.K.)
| | - Nicholas R. Farrar
- Department of Microbial Infection and Immunity, The Ohio State University, Wexner Medical Center, Columbus, OH 43210, USA; (D.H.D.); (J.R.B.); (D.S.); (C.W.P.); (A.L.); (N.R.F.); (S.M.D.); (C.S.K.)
| | - Scott M. Diamond
- Department of Microbial Infection and Immunity, The Ohio State University, Wexner Medical Center, Columbus, OH 43210, USA; (D.H.D.); (J.R.B.); (D.S.); (C.W.P.); (A.L.); (N.R.F.); (S.M.D.); (C.S.K.)
| | - Cory S. Knecht
- Department of Microbial Infection and Immunity, The Ohio State University, Wexner Medical Center, Columbus, OH 43210, USA; (D.H.D.); (J.R.B.); (D.S.); (C.W.P.); (A.L.); (N.R.F.); (S.M.D.); (C.S.K.)
| | - Roger D. Plaut
- Division of Bacterial, Parasitic, and Allergenic Products, Center for Biologics Evaluation and Research, Food and Drug Administration, Silver Spring, MD 20993, USA;
| | - Craig Delury
- Biocomposites Ltd., Keele Science Park, Keele, Staffordshire ST5 5NL, UK; (C.D.); (S.S.A.); (P.A.L.)
| | - Sean S. Aiken
- Biocomposites Ltd., Keele Science Park, Keele, Staffordshire ST5 5NL, UK; (C.D.); (S.S.A.); (P.A.L.)
| | - Phillip A. Laycock
- Biocomposites Ltd., Keele Science Park, Keele, Staffordshire ST5 5NL, UK; (C.D.); (S.S.A.); (P.A.L.)
| | - Anne Sullivan
- Department of Orthopaedics, The Ohio State University, Wexner Medical Center, Columbus, OH 43210, USA; (A.S.); (J.F.G.)
| | - Jeffrey F. Granger
- Department of Orthopaedics, The Ohio State University, Wexner Medical Center, Columbus, OH 43210, USA; (A.S.); (J.F.G.)
| | - Paul Stoodley
- Department of Microbial Infection and Immunity, The Ohio State University, Wexner Medical Center, Columbus, OH 43210, USA; (D.H.D.); (J.R.B.); (D.S.); (C.W.P.); (A.L.); (N.R.F.); (S.M.D.); (C.S.K.)
- Department of Orthopaedics, The Ohio State University, Wexner Medical Center, Columbus, OH 43210, USA; (A.S.); (J.F.G.)
- National Centre for Advanced Tribology at Southampton (nCATS) and National Biofilm Innovation Centre (NBIC), Department of Mechanical Engineering, University of Southampton, Southampton SO17 1BJ, UK
- Correspondence: ; Tel.: +1-614-292-7871
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Annunziato G. Strategies to Overcome Antimicrobial Resistance (AMR) Making Use of Non-Essential Target Inhibitors: A Review. Int J Mol Sci 2019; 20:E5844. [PMID: 31766441 PMCID: PMC6928725 DOI: 10.3390/ijms20235844] [Citation(s) in RCA: 100] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2019] [Revised: 11/19/2019] [Accepted: 11/20/2019] [Indexed: 12/23/2022] Open
Abstract
Antibiotics have always been considered as one of the most relevant discoveries of the twentieth century. Unfortunately, the dawn of the antibiotic era has sadly corresponded to the rise of the phenomenon of antimicrobial resistance (AMR), which is a natural process whereby microbes evolve in such a way to withstand the action of drugs. In this context, the identification of new potential antimicrobial targets and/or the identification of new chemical entities as antimicrobial drugs are in great demand. To date, among the many possible approaches used to deal with antibiotic resistance is the use of antibiotic adjuvants that hit bacterial non-essential targets. In this review, the author focuses on the discovery of antibiotic adjuvants and on new tools to study and reduce the prevalence of resistant bacterial infections.
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Affiliation(s)
- Giannamaria Annunziato
- Probes for Targets Group (P4T group), Department of food and Drug, University of Parma, 43124 Parma, Italy
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117
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Omolo CA, Megrab NA, Kalhapure RS, Agrawal N, Jadhav M, Mocktar C, Rambharose S, Maduray K, Nkambule B, Govender T. Liposomes with pH responsive 'on and off' switches for targeted and intracellular delivery of antibiotics. J Liposome Res 2019; 31:45-63. [PMID: 31663407 DOI: 10.1080/08982104.2019.1686517] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
pH responsive drug delivery systems are one of the new strategies to address the spread of bacterial resistance to currently used antibiotics. The aim of this study was to formulate liposomes with 'On' and 'Off'' pH responsive switches for infection site targeting. The vancomycin (VCM) loaded liposomes had sizes below 100 nm, at pH 7.4. The QL-liposomes had a negative zeta potential at pH 7.4 that switched to a positive charge at acidic pH. VCM release from the liposome was quicker at pH 6 than pH 7.4. The OA-QL-liposome showed 4-fold lower MIC at pH 7.4 and 8- and 16-fold lower at pH 6.0 against both MSSA and MRSA compared to the bare drug. OA-QL liposome had a 1266.67- and 704.33-fold reduction in the intracellular infection for TPH-1 macrophage and HEK293 cells respectively. In vivo studies showed that the amount of MRSA recovered from mice treated with formulations was 189.67 and 6.33-fold lower than the untreated and bare VCM treated mice respectively. MD simulation of the QL lipid with the phosphatidylcholine membrane (POPC) showed spontaneous binding of the lipid to the bilayer membrane both electrostatic and Van der Waals interactions contributed to the binding. These studies demonstrated that the 'On' and 'Off' pH responsive liposomes enhanced the activity targeted and intracellular delivery VCM.
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Affiliation(s)
- Calvin A Omolo
- Discipline of Pharmaceutical Sciences, College of Health Sciences, University of KwaZulu-Natal, Durban, South Africa.,School of Pharmacy and Health Sciences, United States International University of Africa, Nairobi, Kenya
| | - Nagia A Megrab
- Department of Pharmaceutics and Industrial Pharmacy, Zagazig University, Zagazig, Egypt
| | - Rahul S Kalhapure
- Discipline of Pharmaceutical Sciences, College of Health Sciences, University of KwaZulu-Natal, Durban, South Africa
| | - Nikhil Agrawal
- Discipline of Pharmaceutical Sciences, College of Health Sciences, University of KwaZulu-Natal, Durban, South Africa
| | - Mahantesh Jadhav
- Discipline of Pharmaceutical Sciences, College of Health Sciences, University of KwaZulu-Natal, Durban, South Africa
| | - Chunderika Mocktar
- Discipline of Pharmaceutical Sciences, College of Health Sciences, University of KwaZulu-Natal, Durban, South Africa
| | - Sanjeev Rambharose
- Discipline of Pharmaceutical Sciences, College of Health Sciences, University of KwaZulu-Natal, Durban, South Africa.,Division of Emergency Medicine, Department of Surgery, University of Cape Town, Cape Town, South Africa
| | - Kaminee Maduray
- Department of Physiology, School of Laboratory Medicine and Medical Sciences, College of Health Sciences, University of KwaZulu-Natal, Durban, South Africa
| | - Bongani Nkambule
- Department of Physiology, School of Laboratory Medicine and Medical Sciences, College of Health Sciences, University of KwaZulu-Natal, Durban, South Africa
| | - Thirumala Govender
- Discipline of Pharmaceutical Sciences, College of Health Sciences, University of KwaZulu-Natal, Durban, South Africa
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Dynamical Behavior of β-Lactamases and Penicillin- Binding Proteins in Different Functional States and Its Potential Role in Evolution. ENTROPY 2019. [PMCID: PMC7514474 DOI: 10.3390/e21111130] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
β-Lactamases are enzymes produced by bacteria to hydrolyze β-lactam-based antibiotics, and pose serious threat to public health through related antibiotic resistance. Class A β-lactamases are structurally and functionally related to penicillin-binding proteins (PBPs). Despite the extensive studies of the structures, catalytic mechanisms and dynamics of both β-lactamases and PBPs, the potentially different dynamical behaviors of these proteins in different functional states still remain elusive in general. In this study, four evolutionarily related proteins, including TEM-1 and TOHO-1 as class A β-lactamases, PBP-A and DD-transpeptidase as two PBPs, are subjected to molecular dynamics simulations and various analyses to characterize their dynamical behaviors in different functional states. Penicillin G and its ring opening product serve as common ligands for these four proteins of interest. The dynamic analyses of overall structures, the active sites with penicillin G, and three catalytically important residues commonly shared by all four proteins reveal unexpected cross similarities between Class A β-lactamases and PBPs. These findings shed light on both the hidden relations among dynamical behaviors of these proteins and the functional and evolutionary relations among class A β-lactamases and PBPs.
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119
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Yang Y, Ashworth AJ, Willett C, Cook K, Upadhyay A, Owens PR, Ricke SC, DeBruyn JM, Moore Jr. PA. Review of Antibiotic Resistance, Ecology, Dissemination, and Mitigation in U.S. Broiler Poultry Systems. Front Microbiol 2019; 10:2639. [PMID: 31803164 PMCID: PMC6872647 DOI: 10.3389/fmicb.2019.02639] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2018] [Accepted: 10/30/2019] [Indexed: 12/24/2022] Open
Abstract
Since the onset of land application of poultry litter, transportation of microorganisms, antibiotics, and disinfectants to new locations has occurred. While some studies provide evidence that antimicrobial resistance (AMR), an evolutionary phenomenon, could be influenced by animal production systems, other research suggests AMR originates in the environment from non-anthropogenic sources. In addition, AMR impacts the effective prevention and treatment of poultry illnesses and is increasingly a threat to global public health. Therefore, there is a need to understand the dissemination of AMR genes to the environment, particularly those directly relevant to animal health using the One Health Approach. This review focuses on the potential movement of resistance genes to the soil via land application of poultry litter. Additionally, we highlight impacts of AMR on microbial ecology and explore hypotheses explaining gene movement pathways from U.S. broiler operations to the environment. Current approaches for decreasing antibiotic use in U.S. poultry operations are also described in this review.
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Affiliation(s)
- Yichao Yang
- Department of Crop, Soil, and Environmental Sciences, University of Arkansas, Fayetteville, AR, United States
| | - Amanda J. Ashworth
- Poultry Production and Product Safety Research Unit, United States Department of Agriculture, Agricultural Research Service (USDA-ARS), Fayetteville, AR, United States
| | - Cammy Willett
- Department of Crop, Soil, and Environmental Sciences, University of Arkansas, Fayetteville, AR, United States
| | - Kimberly Cook
- Bacterial Epidemiology and Antimicrobial Resistance Research Unit, United States Department of Agriculture, Agricultural Research Service (USDA-ARS), Athens, GA, United States
| | - Abhinav Upadhyay
- Department of Poultry Science, University of Arkansas, Fayetteville, AR, United States
| | - Phillip R. Owens
- United States Department of Agriculture, Agricultural Research Service (USDA-ARS), Dale Bumpers Small Farms Research Center, Booneville, AR, United States
| | - Steven C. Ricke
- Department of Food Science and Center for Food Safety, University of Arkansas, Fayetteville, AR, United States
| | - Jennifer M. DeBruyn
- Department of Biosystems Engineering and Soil Science, University of Tennessee, Knoxville, Knoxville, TN, United States
| | - Philip A. Moore Jr.
- Poultry Production and Product Safety Research Unit, United States Department of Agriculture, Agricultural Research Service (USDA-ARS), Fayetteville, AR, United States
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Popiołek Ł, Rysz B, Biernasiuk A, Wujec M. Synthesis of promising antimicrobial agents: hydrazide‐hydrazones of 5‐nitrofuran‐2‐carboxylic acid. Chem Biol Drug Des 2019; 95:260-269. [DOI: 10.1111/cbdd.13639] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2019] [Revised: 08/08/2019] [Accepted: 09/21/2019] [Indexed: 12/26/2022]
Affiliation(s)
- Łukasz Popiołek
- Department of Organic Chemistry Faculty of Pharmacy with Medical Analytics Division Medical University of Lublin Lublin Poland
| | - Bernadetta Rysz
- Department of Organic Chemistry Faculty of Pharmacy with Medical Analytics Division Medical University of Lublin Lublin Poland
| | - Anna Biernasiuk
- Department of Pharmaceutical Microbiology Faculty of Pharmacy with Medical Analytics Division Medical University of Lublin Lublin Poland
| | - Monika Wujec
- Department of Organic Chemistry Faculty of Pharmacy with Medical Analytics Division Medical University of Lublin Lublin Poland
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121
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Biocompatible Polymer Materials with Antimicrobial Properties for Preparation of Stents. NANOMATERIALS 2019; 9:nano9111548. [PMID: 31683612 PMCID: PMC6915381 DOI: 10.3390/nano9111548] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/26/2019] [Revised: 10/15/2019] [Accepted: 10/29/2019] [Indexed: 12/17/2022]
Abstract
Biodegradable polymers are promising materials for use in medical applications such as stents. Their properties are comparable to commercially available resistant metal and polymeric stents, which have several major problems, such as stent migration and stent clogging due to microbial biofilm. Consequently, conventional stents have to be removed operatively from the patient's body, which presents a number of complications and can also endanger the patient's life. Biodegradable stents disintegrate into basic substances that decompose in the human body, and no surgery is required. This review focuses on the specific use of stents in the human body, the problems of microbial biofilm, and possibilities of preventing microbial growth by modifying polymers with antimicrobial agents.
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122
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Singh AK, Sharma P. Disinfectant-like activity of lipopeptide biosurfactant produced by Bacillus tequilensis strain SDS21. Colloids Surf B Biointerfaces 2019; 185:110514. [PMID: 31639569 DOI: 10.1016/j.colsurfb.2019.110514] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2019] [Revised: 08/25/2019] [Accepted: 09/17/2019] [Indexed: 01/24/2023]
Abstract
Antiseptics and disinfectants are widely applied for eliminating microorganisms. However, microorganisms dwelling in the biofilm are less susceptible and in some cases resistant to biocide treatment. The present study describes isolation and characterization of lipopeptide biosurfactant exhibiting disinfectant-like activity. Biosurfactant was produced by an endo-rhizospheric bacterium Bacillus tequilensis strain SDS21. Biosurfactant reduced the surface tension of water from 72 to 30 mN/m with CMC of 40 mg/l. The Liquid Chromatography-Mass Spectrometry analysis of biosurfactant suggested it to be a mixture of C14, C15, C16 and C17 surfactin homologues. The lipopeptide biosurfactant exhibited bactericidal activity against planktonic cells and biofilm residing sessile cells. The biosurfactant treatment eradicated more than 99% of bacterial biofilm present on polystyrene, glass and stainless steel surface. The biosurfactant retained its bactericidal and biofilm eradicating activities even after exposure to extreme conditions like high temperate and extreme pH. Unlike some of the commonly used disinfectant, biosurfactant retained its bactericidal and biofilm removing activity even in the hard water containing Mg2+ and Ca2+ ions. Thus, suggesting that biosurfactant produced by strain SDS21 can be used as a disinfectant or in disinfectant-like formulations effective against both planktonic and biofilm residing bacteria.
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Affiliation(s)
- Anil Kumar Singh
- Department of Botany, Sant Baba Bhag Singh University, Jalandhar, Punjab, 144030, India.
| | - Prakriti Sharma
- College of Animal Biotechnology, Guru Angad Dev Veterinary And Animal Sciences University, Ludhiana, Punjab, 141004, India
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123
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Barrios-Gumiel A, Sanchez-Nieves J, Pérez-Serrano J, Gómez R, de la Mata FJ. PEGylated AgNP covered with cationic carbosilane dendrons to enhance antibacterial and inhibition of biofilm properties. Int J Pharm 2019; 569:118591. [DOI: 10.1016/j.ijpharm.2019.118591] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2019] [Revised: 07/30/2019] [Accepted: 08/01/2019] [Indexed: 10/26/2022]
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124
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Holmes EAF, Hughes DA. Challenges for Economic Evaluation of Health Care Strategies to Contain Antimicrobial Resistance. Antibiotics (Basel) 2019; 8:antibiotics8040166. [PMID: 31569624 PMCID: PMC6963561 DOI: 10.3390/antibiotics8040166] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2019] [Revised: 09/15/2019] [Accepted: 09/24/2019] [Indexed: 11/16/2022] Open
Abstract
The threat of antimicrobial resistance has global health and economic consequences. Medical strategies to reduce unnecessary antibiotic prescribing, to conserve the effectiveness of current antimicrobials in the long term, inevitably result in short-term costs to health care providers. Economic evaluations of health care interventions therefore need to consider the short-term costs of interventions, to gain future benefits. This represents a challenge for health economists, not only in terms of the most appropriate methods for evaluation, but also in attributing the potential budget impact over time and considering health impacts on future populations. This commentary discusses the challenge of accurately capturing the cost-effectiveness of health care interventions aimed at tackling antimicrobial resistance. We reflect on methods to capture and incorporate the costs and health outcomes associated with antimicrobial resistance, the appropriateness of the quality-adjusted-life year (QALY), individual time preferences, and perspectives in economic evaluation.
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Affiliation(s)
- Emily A F Holmes
- Centre for Health Economics and Medicines Evaluation (CHEME), Bangor University, Normal Site, Bangor, Gwynedd LL57 2PZ, UK.
| | - Dyfrig A Hughes
- Centre for Health Economics and Medicines Evaluation (CHEME), Bangor University, Normal Site, Bangor, Gwynedd LL57 2PZ, UK.
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125
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Richter P, Krüger M, Prasad B, Gastiger S, Bodenschatz M, Wieder F, Burkovski A, Geißdörfer W, Lebert M, Strauch SM. Using Colistin as a Trojan Horse: Inactivation of Gram-Negative Bacteria with Chlorophyllin. Antibiotics (Basel) 2019; 8:E158. [PMID: 31547053 PMCID: PMC6963628 DOI: 10.3390/antibiotics8040158] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2019] [Revised: 09/15/2019] [Accepted: 09/17/2019] [Indexed: 12/11/2022] Open
Abstract
Colistin (polymyxin E) is a membrane-destabilizing antibiotic used against Gram-negative bacteria. We have recently reported that the outer membrane prevents the uptake of antibacterial chlorophyllin into Gram-negative cells. In this study, we used sub-toxic concentrations of colistin to weaken this barrier for a combination treatment of Escherichia coli and Salmonella enterica serovar Typhimurium with chlorophyllin. In the presence of 0.25 µg/mL colistin, chlorophyllin was able to inactivate both bacteria strains at concentrations of 5-10 mg/L for E. coli and 0.5-1 mg/L for S. Typhimurium, which showed a higher overall susceptibility to chlorophyllin treatment. In accordance with a previous study, chlorophyllin has proven antibacterial activity both as a photosensitizer, illuminated with 12 mW/cm2, and in darkness. Our data clearly confirmed the relevance of the outer membrane in protection against xenobiotics. Combination treatment with colistin broadens chlorophyllin's application spectrum against Gram-negatives and gives rise to the assumption that chlorophyllin together with cell membrane-destabilizing substances may become a promising approach in bacteria control. Furthermore, we demonstrated that colistin acts as a door opener even for the photodynamic inactivation of colistin-resistant (mcr-1-positive) E. coli cells by chlorophyllin, which could help us to overcome this antimicrobial resistance.
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Affiliation(s)
- Peter Richter
- Cell Biology Division, Department of Biology, Friedrich-Alexander University Erlangen-Nuremberg, Staudtstraße 5, 91058 Erlangen, Germany.
| | - Marcus Krüger
- Clinic for Plastic, Aesthetic and Hand Surgery, Otto von Guericke University Magdeburg, Leipziger Str. 44, 39120 Magdeburg, Germany.
| | - Binod Prasad
- Cell Biology Division, Department of Biology, Friedrich-Alexander University Erlangen-Nuremberg, Staudtstraße 5, 91058 Erlangen, Germany.
| | - Susanne Gastiger
- Microbiology Division, Department of Biology, Friedrich-Alexander University Erlangen-Nuremberg, Staudtstraße 5, 91058 Erlangen, Germany.
| | - Mona Bodenschatz
- Microbiology Division, Department of Biology, Friedrich-Alexander University Erlangen-Nuremberg, Staudtstraße 5, 91058 Erlangen, Germany.
| | - Florian Wieder
- Cell Biology Division, Department of Biology, Friedrich-Alexander University Erlangen-Nuremberg, Staudtstraße 5, 91058 Erlangen, Germany.
| | - Andreas Burkovski
- Microbiology Division, Department of Biology, Friedrich-Alexander University Erlangen-Nuremberg, Staudtstraße 5, 91058 Erlangen, Germany.
| | - Walter Geißdörfer
- Microbiological Diagnostics, Clinical Microbiology, Immunology and Hygiene, University Hospital Erlangen, Wasserturmstraße 3/5, 91054 Erlangen, Germany.
| | - Michael Lebert
- Cell Biology Division, Department of Biology, Friedrich-Alexander University Erlangen-Nuremberg, Staudtstraße 5, 91058 Erlangen, Germany.
| | - Sebastian M Strauch
- Postgraduate Program in Health and Environment, University of Joinville Region, Rua Paulo Malschitzki, 10, Joinville 89219-710, Brazil.
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126
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Synthesis and structural studies of nickel(II)- and copper(II)-N,N′-diarylformamidine dithiocarbamate complexes as antimicrobial and antioxidant agents. Polyhedron 2019. [DOI: 10.1016/j.poly.2019.06.038] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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127
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Amphiphilic nebramine-based hybrids Rescue legacy antibiotics from intrinsic resistance in multidrug-resistant Gram-negative bacilli. Eur J Med Chem 2019; 175:187-200. [DOI: 10.1016/j.ejmech.2019.05.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2018] [Revised: 04/24/2019] [Accepted: 05/01/2019] [Indexed: 12/15/2022]
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128
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Kumar S, Thakur J, Yadav K, Mitra M, Pal S, Ray A, Gupta S, Medatwal N, Gupta R, Mishra D, Rani P, Padhi S, Sharma P, Kapil A, Srivastava A, Priyakumar UD, Dasgupta U, Thukral L, Bajaj A. Cholic Acid-Derived Amphiphile which Combats Gram-Positive Bacteria-Mediated Infections via Disintegration of Lipid Clusters. ACS Biomater Sci Eng 2019; 5:4764-4775. [PMID: 33448819 DOI: 10.1021/acsbiomaterials.9b00706] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Inappropriate and uncontrolled use of antibiotics results in the emergence of antibiotic resistance, thereby threatening the present clinical regimens to treat infectious diseases. Therefore, new antimicrobial agents that can prevent bacteria from developing drug resistance are urgently needed. Selective disruption of bacterial membranes is the most effective strategy for combating microbial infections as accumulation of genetic mutations will not allow for the emergence of drug resistance against these antimicrobials. In this work, we tested cholic acid (CA) derived amphiphiles tethered with different alkyl chains for their ability to combat Gram-positive bacterial infections. In-depth biophysical and biomolecular simulation studies suggested that the amphiphile with a hexyl chain (6) executes more effective interactions with Gram-positive bacterial membranes as compared to other hydrophobic counterparts. Amphiphile 6 is effective against multidrug resistant Gram-positive bacterial strains as well and does not allow the adherence of S. aureus on amphiphile 6 coated catheters implanted in mice. Further, treatment of wound infections with amphiphile 6 clears the bacterial infections. Therefore, the current study presents strategic guidelines in design and development of CA-derived membrane-targeting antimicrobials for Gram-positive bacterial infections.
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Affiliation(s)
- Sandeep Kumar
- Laboratory of Nanotechnology and Chemical Biology, Regional Centre for Biotechnology, NCR Biotech Science Cluster, 3rd Milestone Faridabad-Gurgaon Expressway, Faridabad-121001, Haryana, India.,Manipal Academy of Higher Education, Tiger Circle Road, Madhav Nagar, Manipal-576104, Karnataka, India
| | - Jyoti Thakur
- Department of Chemistry, Indian Institute of Science Education and Research, Bhopal Bypass Road, Bhauri, Bhopal-462066, Madhya Pradesh, India
| | - Kavita Yadav
- Laboratory of Nanotechnology and Chemical Biology, Regional Centre for Biotechnology, NCR Biotech Science Cluster, 3rd Milestone Faridabad-Gurgaon Expressway, Faridabad-121001, Haryana, India.,Manipal Academy of Higher Education, Tiger Circle Road, Madhav Nagar, Manipal-576104, Karnataka, India
| | - Madhurima Mitra
- Laboratory of Nanotechnology and Chemical Biology, Regional Centre for Biotechnology, NCR Biotech Science Cluster, 3rd Milestone Faridabad-Gurgaon Expressway, Faridabad-121001, Haryana, India
| | - Sanjay Pal
- Laboratory of Nanotechnology and Chemical Biology, Regional Centre for Biotechnology, NCR Biotech Science Cluster, 3rd Milestone Faridabad-Gurgaon Expressway, Faridabad-121001, Haryana, India.,Kalinga Institute of Industrial Technology, KIIT Road, Patia, Bhubaneswar-751024, Odisha, India
| | - Arjun Ray
- CSIR-Institute of Genomics and Integrative Biology, South Campus, Mathura Road, Opp: Sukhdev Vihar Bus Depot, New Delhi-110025, India
| | - Siddhi Gupta
- Laboratory of Nanotechnology and Chemical Biology, Regional Centre for Biotechnology, NCR Biotech Science Cluster, 3rd Milestone Faridabad-Gurgaon Expressway, Faridabad-121001, Haryana, India
| | - Nihal Medatwal
- Laboratory of Nanotechnology and Chemical Biology, Regional Centre for Biotechnology, NCR Biotech Science Cluster, 3rd Milestone Faridabad-Gurgaon Expressway, Faridabad-121001, Haryana, India
| | - Ragini Gupta
- Laboratory of Nanotechnology and Chemical Biology, Regional Centre for Biotechnology, NCR Biotech Science Cluster, 3rd Milestone Faridabad-Gurgaon Expressway, Faridabad-121001, Haryana, India
| | - Deepakkumar Mishra
- Laboratory of Nanotechnology and Chemical Biology, Regional Centre for Biotechnology, NCR Biotech Science Cluster, 3rd Milestone Faridabad-Gurgaon Expressway, Faridabad-121001, Haryana, India
| | - Parul Rani
- Laboratory of Nanotechnology and Chemical Biology, Regional Centre for Biotechnology, NCR Biotech Science Cluster, 3rd Milestone Faridabad-Gurgaon Expressway, Faridabad-121001, Haryana, India
| | - Siladitya Padhi
- Centre for Computational Natural Sciences and Bioinformatics, International Institute of Information Technology, Professor CR Rao Road, Gachibowli, Hyderabad-500032, India
| | - Priyanka Sharma
- Department of Microbiology, All India Institute of Medical Sciences, Sri Aurobindo Marg, Ansari Nagar, New Delhi-110029, India
| | - Arti Kapil
- Department of Microbiology, All India Institute of Medical Sciences, Sri Aurobindo Marg, Ansari Nagar, New Delhi-110029, India
| | - Aasheesh Srivastava
- Department of Chemistry, Indian Institute of Science Education and Research, Bhopal Bypass Road, Bhauri, Bhopal-462066, Madhya Pradesh, India
| | - U Deva Priyakumar
- Centre for Computational Natural Sciences and Bioinformatics, International Institute of Information Technology, Professor CR Rao Road, Gachibowli, Hyderabad-500032, India
| | - Ujjaini Dasgupta
- Amity Institute of Integrative Sciences and Health, Amity University, Amity Education Valley Gurugram, Panchgaon, Manesar, Gurugram-122413, Haryana, India
| | - Lipi Thukral
- CSIR-Institute of Genomics and Integrative Biology, South Campus, Mathura Road, Opp: Sukhdev Vihar Bus Depot, New Delhi-110025, India
| | - Avinash Bajaj
- Laboratory of Nanotechnology and Chemical Biology, Regional Centre for Biotechnology, NCR Biotech Science Cluster, 3rd Milestone Faridabad-Gurgaon Expressway, Faridabad-121001, Haryana, India
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129
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Sumi CD, Heffernan AJ, Lipman J, Roberts JA, Sime FB. What Antibiotic Exposures Are Required to Suppress the Emergence of Resistance for Gram-Negative Bacteria? A Systematic Review. Clin Pharmacokinet 2019; 58:1407-1443. [DOI: 10.1007/s40262-019-00791-z] [Citation(s) in RCA: 57] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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130
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In Vitro Antimicrobial Activity of Some Medicinal Plants against Human Pathogenic Bacteria. J Trop Med 2019; 2019:1895340. [PMID: 31065287 PMCID: PMC6466868 DOI: 10.1155/2019/1895340] [Citation(s) in RCA: 121] [Impact Index Per Article: 24.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2019] [Revised: 03/08/2019] [Accepted: 03/13/2019] [Indexed: 11/24/2022] Open
Abstract
The emergence and spread of antibiotic resistance, as well as the evolution of new strains of disease causing agents, are of great concern to the global health community. Effective treatment of a disease entails the development of new pharmaceuticals or some potential source of novel drugs. Commonly used medicinal plants of our community could be an excellent source of drugs to fight off this problem. This study is focused on exploring the antimicrobial properties of the plants that are commonly being used as traditional medicines. The antimicrobial potential of four different plant extracts was screened against twelve pathogenic microorganisms and two reference bacterial strains. Methanolic extracts of Oxalis corniculata, Artemisia vulgaris, Cinnamomum tamala, and Ageratina adenophora were subjected to a test of their antimicrobial properties by agar well diffusion method. The result indicated that most of the extracts exhibited antimicrobial properties. The highest potential was observed in the extract of O. corniculata against Escherichia coli, Salmonella Typhi, MDR Salmonella Typhi, Klebsiella pneumoniae, and Citrobacter koseri with zone of inhibition (ZOI) of 17 mm, 13 mm, 16 mm, 11 mm, and 12 mm, respectively. Oxalis corniculata also showed the highest MIC against test organisms. The methanolic extract of Artemisia vulgaris, Cinnamomum tamala, and Ageratina adenophora showed efficacy against Staphylococcus aureus. Ageratina adenophora also showed antifungal activity against Rhizopus spp. The experiment confirmed the efficacy of some selected plant extracts as natural antimicrobials and suggested the possibility of employing them in drugs for the treatment of infectious diseases caused by the test organisms.
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131
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Karmakar P, Gaitonde V. Promising Recent Strategies with Potential Clinical Translational Value to Combat Antibacterial Resistant Surge. MEDICINES (BASEL, SWITZERLAND) 2019; 6:E21. [PMID: 30709019 PMCID: PMC6473725 DOI: 10.3390/medicines6010021] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/06/2018] [Revised: 01/10/2019] [Accepted: 01/26/2019] [Indexed: 12/27/2022]
Abstract
Multiple drug resistance (MDR) for the treatment of bacterial infection has been a significant challenge since the beginning of the 21st century. Many of the small molecule-based antibiotic treatments have failed on numerous occasions due to a surge in MDR, which has claimed millions of lives worldwide. Small particles (SPs) consisting of metal, polymer or carbon nanoparticles (NPs) of different sizes, shapes and forms have shown considerable antibacterial effect over the past two decades. Unlike the classical small-molecule antibiotics, the small particles are less exposed so far to the bacteria to trigger a resistance mechanism, and hence have higher chances of fighting the challenge of the MDR process. Until recently, there has been limited progress of clinical treatments using NPs, despite ample reports of in vitro antibacterial efficacy. In this review, we discuss some recent and unconventional strategies that have explored the antibacterial efficacy of these small particles, alone and in combination with classical small molecules in vivo, and demonstrate possibilities that are favorable for clinical translations in near future.
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Affiliation(s)
- Partha Karmakar
- Department of Radiology, Washington University School of Medicine, St. Louis, MO 63110, USA.
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132
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Mantravadi PK, Kalesh KA, Dobson RCJ, Hudson AO, Parthasarathy A. The Quest for Novel Antimicrobial Compounds: Emerging Trends in Research, Development, and Technologies. Antibiotics (Basel) 2019; 8:E8. [PMID: 30682820 PMCID: PMC6466574 DOI: 10.3390/antibiotics8010008] [Citation(s) in RCA: 54] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2019] [Revised: 01/17/2019] [Accepted: 01/20/2019] [Indexed: 12/11/2022] Open
Abstract
Pathogenic antibiotic resistant bacteria pose one of the most important health challenges of the 21st century. The overuse and abuse of antibiotics coupled with the natural evolutionary processes of bacteria has led to this crisis. Only incremental advances in antibiotic development have occurred over the last 30 years. Novel classes of molecules, such as engineered antibodies, antibiotic enhancers, siderophore conjugates, engineered phages, photo-switchable antibiotics, and genome editing facilitated by the CRISPR/Cas system, are providing new avenues to facilitate the development of antimicrobial therapies. The informatics revolution is transforming research and development efforts to discover novel antibiotics. The explosion of nanotechnology and micro-engineering is driving the invention of antimicrobial materials, enabling the cultivation of "uncultivable" microbes and creating specific and rapid diagnostic technologies. Finally, a revival in the ecological aspects of microbial disease management, the growth of prebiotics, and integrated management based on the "One Health" model, provide additional avenues to manage this health crisis. These, and future scientific and technological developments, must be coupled and aligned with sound policy and public awareness to address the risks posed by rising antibiotic resistance.
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Affiliation(s)
| | | | - Renwick C J Dobson
- Biomolecular Interaction Centre and School of Biological Sciences, University of Canterbury, Private Bag 4800 Christchurch, New Zealand.
| | - André O Hudson
- Rochester Institute of Technology, Thomas H. Gosnell School of Life Sciences, 85 Lomb Memorial Dr, Rochester, NY 14623, USA.
| | - Anutthaman Parthasarathy
- Rochester Institute of Technology, Thomas H. Gosnell School of Life Sciences, 85 Lomb Memorial Dr, Rochester, NY 14623, USA.
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133
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Sun L, Jiang W, Zhang H, Guo Y, Chen W, Jin Y, Chen H, Du K, Dai H, Ji J, Wang B. Photosensitizer-Loaded Multifunctional Chitosan Nanoparticles for Simultaneous in Situ Imaging, Highly Efficient Bacterial Biofilm Eradication, and Tumor Ablation. ACS APPLIED MATERIALS & INTERFACES 2019; 11:2302-2316. [PMID: 30596498 DOI: 10.1021/acsami.8b19522] [Citation(s) in RCA: 55] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
In recent decades, bacterial and viral infections and chronic inflammatory response have emerged as important causes of cancer. Also, infections remain a significant cause of morbidity and mortality in cancer patients. In this work, carboxymethyl chitosan nanoparticles (CMC NPs) were synthesized in a facile and green way and further combined with ammonium methylbenzene blue (MB) as a cross-linking agent as well as a fluorescent molecule and a photosensitizer for self-imaging photodynamic therapy (PDT). The obtained CMC-MB NPs exhibited an apparent pH-responsive release behavior of MB, which was released for a prolonged period in a simulated physiological environment (pH 7.4) for more than 15 days and the time reduced to only 3.5 h in acidic conditions (pH 5.5). When irradiated by a 650 nm laser at 202 mW/cm2 for 5 min, the CMC-MB NPs showed efficient bactericidal and biofilm eradication properties as well as suppression of tumor cell growth in a similar acidified microenvironment. Furthermore, in an in vivo rabbit wound bacterial infection model, the rapid sterilization of CMC-MB NPs played a crucial role in bacterial infections, inflammation inhibition, and wound healing. As a PDT treatment against cancer, the CMC-MB NPs also exhibited an efficient antitumor therapeutic effect in a subcutaneous tumor mice model.
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Affiliation(s)
- Lin Sun
- School of Ophthalmology & Optometry, Eye Hospital , Wenzhou Medical University , Wenzhou 325027 , China
| | - Wenya Jiang
- School of Ophthalmology & Optometry, Eye Hospital , Wenzhou Medical University , Wenzhou 325027 , China
| | - Hengrui Zhang
- School of Ophthalmology & Optometry, Eye Hospital , Wenzhou Medical University , Wenzhou 325027 , China
- Wenzhou Institute of Biomaterials and Engineering , Chinese Academy of Sciences , Wenzhou 325000 , China
| | - Yishun Guo
- School of Ophthalmology & Optometry, Eye Hospital , Wenzhou Medical University , Wenzhou 325027 , China
| | - Wei Chen
- School of Ophthalmology & Optometry, Eye Hospital , Wenzhou Medical University , Wenzhou 325027 , China
- Wenzhou Institute of Biomaterials and Engineering , Chinese Academy of Sciences , Wenzhou 325000 , China
| | - Yingying Jin
- School of Ophthalmology & Optometry, Eye Hospital , Wenzhou Medical University , Wenzhou 325027 , China
| | - Hao Chen
- School of Ophthalmology & Optometry, Eye Hospital , Wenzhou Medical University , Wenzhou 325027 , China
- Wenzhou Institute of Biomaterials and Engineering , Chinese Academy of Sciences , Wenzhou 325000 , China
| | - Kanghui Du
- School of Ophthalmology & Optometry, Eye Hospital , Wenzhou Medical University , Wenzhou 325027 , China
| | - Hangdong Dai
- School of Ophthalmology & Optometry, Eye Hospital , Wenzhou Medical University , Wenzhou 325027 , China
| | - Jian Ji
- MOE Key Laboratory of Macromolecule Synthesis and Functionalization, Department of Polymer Science and Engineering , Zhejiang University , Hangzhou 310027 , China
| | - Bailiang Wang
- School of Ophthalmology & Optometry, Eye Hospital , Wenzhou Medical University , Wenzhou 325027 , China
- Wenzhou Institute of Biomaterials and Engineering , Chinese Academy of Sciences , Wenzhou 325000 , China
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134
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Atique Ullah AK, Tamanna AN, Hossain A, Akter M, Kabir MF, Tareq ARM, Fazle Kibria AKM, Kurasaki M, Rahman MM, Khan MNI. In vitro cytotoxicity and antibiotic application of green route surface modified ferromagnetic TiO2 nanoparticles. RSC Adv 2019; 9:13254-13262. [PMID: 35520756 PMCID: PMC9063744 DOI: 10.1039/c9ra01395d] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2019] [Accepted: 04/15/2019] [Indexed: 11/21/2022] Open
Abstract
The enormous numbers of applications of TiO2 nanoparticles (NPs) cause concern about their risk to the environment and human health. Consequently, motivated by the necessity of searching for new sources of TiO2 NPs of low cytotoxicity with antibacterial activity, we synthesized TiO2 NPs by a green route using a solution of titanium(iv) isopropoxide as a precursor and an aqueous extract of Artocarpus heterophyllus leaf as a reducing and surface modifying agent. We investigated their structure, shape, size, and magnetic properties, and evaluated their antibiotic application and cytotoxicity. The synthesized TiO2 NPs were applied against two Gram-negative bacteria (E. coli and S. typhimurium) and two Gram-positive bacteria (S. aureus and B. subtilis) to observe their antibacterial activity; and eventually clear zones of inhibition formed by the TiO2 NPs were obtained. Moreover, after exposing the synthesized TiO2 NPs to HeLa cells (carcinoma cells) and Vero cells (normal cells), no toxic effect was found up to a dose of 1000 mg L−1, indicating the safe use of the samples up to at least 1000 mg L−1. However, toxic effects on HeLa cells and Vero cells were observed at doses of 2000 mg L−1 and 3000 mg L−1, respectively. These results indicate the safe use of Artocarpus heterophyllus leaf extract mediated synthesized TiO2 NPs in their potential applications. Artocarpus heterophyllus leaf extract mediated green synthesized TiO2 nanoparticles exhibit less toxicity with high antibacterial activity.![]()
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Affiliation(s)
- A. K. M. Atique Ullah
- Nanoscience and Technology Research Laboratory
- Atomic Energy Centre
- Bangladesh Atomic Energy Commission
- Dhaka 1000
- Bangladesh
| | - A. N. Tamanna
- Department of Physics
- University of Dhaka
- Dhaka 1000
- Bangladesh
| | - A. Hossain
- Department of Physical and Inorganic Chemistry
- Institute of Natural Sciences and Mathematics
- Ural Federal University
- 620000 Yekaterinburg
- Russia
| | - M. Akter
- Graduate School of Environmental Science
- Hokkaido University
- 060-0810 Sapporo
- Japan
| | - M. F. Kabir
- Department of Physics
- University of Dhaka
- Dhaka 1000
- Bangladesh
| | - A. R. M. Tareq
- Environmental Organic Chemistry Laboratory
- Chemistry Division
- Atomic Energy Centre
- Bangladesh Atomic Energy Commission
- Dhaka 1000
| | - A. K. M. Fazle Kibria
- Nuclear Safety, Security and Safeguards Division
- Bangladesh Atomic Energy Commission
- Dhaka 1207
- Bangladesh
| | - Masaaki Kurasaki
- Graduate School of Environmental Science
- Hokkaido University
- 060-0810 Sapporo
- Japan
| | - M. M. Rahman
- Department of Physics
- University of Dhaka
- Dhaka 1000
- Bangladesh
| | - M. N. I. Khan
- Materials Science Division
- Atomic Energy Centre
- Bangladesh Atomic Energy Commission
- Dhaka 1000
- Bangladesh
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135
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Tejchman W, Orwat B, Korona-Głowniak I, Barbasz A, Kownacki I, Latacz G, Handzlik J, Żesławska E, Malm A. Highly efficient microwave synthesis of rhodanine and 2-thiohydantoin derivatives and determination of relationships between their chemical structures and antibacterial activity. RSC Adv 2019; 9:39367-39380. [PMID: 35540630 PMCID: PMC9076067 DOI: 10.1039/c9ra08690k] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2019] [Accepted: 11/15/2019] [Indexed: 11/21/2022] Open
Abstract
Here we report studies on the synthesis of 12 new heterocyclic derivatives that differ in three structural motifs and the simultaneous evaluation of the impact of these three variables on the biological properties. The examined compounds are based on rhodanine and 2-thiohydantoin cores equipped with hydrogen or carboxymethyl substituents at the N-3 position and linked to a triphenylamine moiety through 1,4-phenylene, 1,4-naphthalenylene and 1,9-anthracenylene spacers at the C-5 position of the heterocycles. All the compounds were synthesized very quickly, selectively and in high yields according to the developed microwave-assisted Knoevenagel condensation protocol, and they were characterized thoroughly with NMR, FT-IR and ESI-HRMS techniques. The derivatives were tested for their activity against selected strains of Gram-positive and Gram-negative bacteria and yeast. Two compounds showed good activity against Gram-positive bacteria, and all of them showed low cytotoxicity against three cell lines of the human immune system. Based on membrane permeability assays it was demonstrated that the active compounds do not penetrate the cell membrane, and thus they must act on the bacterial cell surface. Finally, we proved that the evaluated structure modifications had a synergistic effect and the simultaneous presence of a 1,4-phenylene spacer and carboxymethyl group at N-3 caused the highest boost in antimicrobial activity. An efficient microwave-assisted synthesis of rhodanine and 2-thiohydantoin derivatives, and the correlation between their chemical structure and biological properties is reported.![]()
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Affiliation(s)
- Waldemar Tejchman
- Department of Chemistry
- Institute of Biology
- Pedagogical University of Cracow
- 30-084 Kraków
- Poland
| | - Bartosz Orwat
- Faculty of Chemistry
- Adam Mickiewicz University
- 61-614 Poznań
- Poland
- Centre for Advanced Technology
| | | | - Anna Barbasz
- Department of Chemistry
- Institute of Biology
- Pedagogical University of Cracow
- 30-084 Kraków
- Poland
| | - Ireneusz Kownacki
- Faculty of Chemistry
- Adam Mickiewicz University
- 61-614 Poznań
- Poland
- Centre for Advanced Technology
| | - Gniewomir Latacz
- Department of Technology and Biotechnology of Drugs
- Jagiellonian University Medical College
- 30-688 Kraków
- Poland
| | - Jadwiga Handzlik
- Department of Technology and Biotechnology of Drugs
- Jagiellonian University Medical College
- 30-688 Kraków
- Poland
| | - Ewa Żesławska
- Department of Chemistry
- Institute of Biology
- Pedagogical University of Cracow
- 30-084 Kraków
- Poland
| | - Anna Malm
- Department of Pharmaceutical Microbiology
- Medical University of Lublin
- 20-093 Lublin
- Poland
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136
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Azidothymidine Produces Synergistic Activity in Combination with Colistin against Antibiotic-Resistant Enterobacteriaceae. Antimicrob Agents Chemother 2018; 63:AAC.01630-18. [PMID: 30373798 DOI: 10.1128/aac.01630-18] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2018] [Accepted: 10/12/2018] [Indexed: 12/21/2022] Open
Abstract
Bacterial infections remain a leading killer worldwide, which is worsened by the continuous emergence of antibiotic resistance. In particular, antibiotic-resistant Enterobacteriaceae are prevalent and extremely difficult to treat. Repurposing existing drugs and improving the therapeutic potential of existing antibiotics represent an attractive novel strategy. Azidothymidine (AZT) is an antiretroviral drug which is used in combination with other antivirals to prevent and to treat HIV/AIDS. AZT is also active against Gram-negative bacteria but has not been developed for that purpose. Here, we investigated the in vitro and in vivo efficacy of AZT in combination with colistin against antibiotic-resistant Enterobacteriaceae, including strains producing extended-spectrum beta-lactamases (ESBLs) or New Delhi metallo-beta-lactamase 1 (NDM) or carrying mobilized colistin resistance (mcr-1). The MIC was determined using the broth microdilution method. The combined effect of AZT and colistin was examined using the checkerboard method and time-kill analysis. A murine peritoneal infection model was used to test the therapeutic effect of the combination of AZT and colistin. The fractional inhibitory concentration index from the checkerboard assay demonstrated that AZT synergized with colistin against 61% and 87% of ESBL-producing Escherichia coli and Klebsiella pneumoniae strains, respectively, 100% of NDM-1-producing strains, and 92% of mcr-1-producing E. coli strains. Time-kill analysis demonstrated significant synergistic activities when AZT was combined with colistin. In a murine peritoneal infection model, AZT in combination with colistin showed augmented activities of both drugs in the treatment of NDM-1 K. pneumoniae and mcr-1 E. coli infections. The AZT and colistin combination possesses a potential to be used coherently to treat antibiotic-resistant Enterobacteriaceae infections.
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137
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Dreyer J, Malan AP, Dicks LMT. Bacteria of the Genus Xenorhabdus, a Novel Source of Bioactive Compounds. Front Microbiol 2018; 9:3177. [PMID: 30619229 PMCID: PMC6305712 DOI: 10.3389/fmicb.2018.03177] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2018] [Accepted: 12/07/2018] [Indexed: 12/04/2022] Open
Abstract
The genus Xenorhabdus of the family Enterobacteriaceae, are mutualistically associated with entomopathogenic nematodes of the genus Steinernema. Although most of the associations are species-specific, a specific Xenorhabdus sp. may infect more than one Steinernema sp. During the Xenorhabdus-Steinernema life cycle, insect larvae are infected and killed, while both mutualists produce bioactive compounds. These compounds act synergistically to ensure reproduction and proliferation of the nematodes and bacteria. A single strain of Xenorhabdus may produce a variety of antibacterial and antifungal compounds, some of which are also active against insects, nematodes, protozoa, and cancer cells. Antimicrobial compounds produced by Xenorhabdus spp. have not been researched to the same extent as other soil bacteria and they may hold the answer to novel antibacterial and antifungal compounds. This review summarizes the bioactive secondary metabolites produced by Xenorhabdus spp. and their application in disease control. Gene regulation and increasing the production of a few of these antimicrobial compounds are discussed. Aspects limiting future development of these novel bioactive compounds are also pointed out.
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Affiliation(s)
- Jönike Dreyer
- Department of Microbiology, Stellenbosch University, Stellenbosch, South Africa
| | - Antoinette P. Malan
- Department of Conservation Ecology and Entomology, Stellenbosch University, Stellenbosch, South Africa
| | - Leon M. T. Dicks
- Department of Microbiology, Stellenbosch University, Stellenbosch, South Africa
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138
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Delaviz Y, Liu TW, Deonarain AR, Finer Y, Shokati B, Santerre JP. Physical properties and cytotoxicity of antimicrobial dental resin adhesives containing dimethacrylate oligomers of Ciprofloxacin and Metronidazole. Dent Mater 2018; 35:229-243. [PMID: 30502964 DOI: 10.1016/j.dental.2018.11.016] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2018] [Revised: 10/14/2018] [Accepted: 11/14/2018] [Indexed: 11/26/2022]
Abstract
OBJECTIVE Antimicrobial oligomers synthesized from ciprofloxacin (CF) and metronidazole (MN) were investigated for their potential use in dental adhesives. METHODS Susceptibility of the cariogenic bacterium Streptococcus mutans UA159 to CF, MN, and CF/MN combination was evaluated. Hydrolytic stability and drug release from the oligomers was studied in buffer and simulated human salivary esterase conditions. Cytotoxicity of films with 15wt% drug oligomers co-polymerized with commercial monomers were assessed using human gingival fibroblasts (HGFs). In-house adhesives were prepared and characterized for viscosity. Polymerized films were analysed for gel content and water swelling. Interfacial fracture toughness (KIC) of composites bonded to dentin by either a 2 or 3-step etch-and-rinse approach using the in-house formulated adhesives was measured. RESULTS The respective minimum inhibitory concentration for CF and MN against S. mutans was 0.7 and 2400μg/mL, with the combination having an additive effect (0.35μg/mL CF with 1200μg/mL MN). Antibiotics were released upon hydrolysis of the oligomers. Films containing the drug oligomers were not cytotoxic against HGFs. Replacing 2-hydroxyethyl methacrylate with the drug oligomers increased the viscosity of the experimental adhesives, reduced gel content, and decreased swelling of films in water. Antimicrobial adhesives demonstrated bonding to dentin with interfacial KIC values comparable to the in-house control in the 2-step application, and with slightly lower KIC values in the 3-step approach. SIGNIFICANCE The antimicrobial oligomers can be incorporated into dental adhesive systems using formulations that show comparable fracture toughness to commercial materials, and may provide a means to deliver local antimicrobial drug release at the marginal interface.
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Affiliation(s)
- Yasaman Delaviz
- Institute of Biomaterials and Biomedical Engineering, University of Toronto, Ontario, Canada
| | - Timothy W Liu
- Institute of Biomaterials and Biomedical Engineering, University of Toronto, Ontario, Canada
| | | | - Yoav Finer
- Institute of Biomaterials and Biomedical Engineering, University of Toronto, Ontario, Canada; Faculty of Dentistry, University of Toronto, Ontario, Canada
| | - Babak Shokati
- Faculty of Dentistry, University of Toronto, Ontario, Canada
| | - J Paul Santerre
- Institute of Biomaterials and Biomedical Engineering, University of Toronto, Ontario, Canada; Faculty of Dentistry, University of Toronto, Ontario, Canada.
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139
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Arshad M, Shoeb Khan M, Asghar Nami SA, Ahmad D. Synthesis, Characterization, Computational, Antimicrobial Screening, and MTT Assay of Thiazolidinone Derivatives Containing the Indole and Pyridine Moieties. RUSS J GEN CHEM+ 2018. [DOI: 10.1134/s1070363218100213] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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140
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González-Bello C. The Inhibition of Lipid A Biosynthesis-The Antidote Against Superbugs? ADVANCED THERAPEUTICS 2018. [DOI: 10.1002/adtp.201800117] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Concepción González-Bello
- Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CIQUS); Departamento de Química Orgánica; Universidade de Santiago de Compostela; calle Jenaro de la Fuente s/n 15782 Santiago de Compostela Spain
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141
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Dicks LMT, Dreyer L, Smith C, van Staden AD. A Review: The Fate of Bacteriocins in the Human Gastro-Intestinal Tract: Do They Cross the Gut-Blood Barrier? Front Microbiol 2018; 9:2297. [PMID: 30323796 PMCID: PMC6173059 DOI: 10.3389/fmicb.2018.02297] [Citation(s) in RCA: 92] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2018] [Accepted: 09/07/2018] [Indexed: 12/20/2022] Open
Abstract
The intestinal barrier, consisting of the vascular endothelium, epithelial cell lining, and mucus layer, covers a surface of about 400 m2. The integrity of the gut wall is sustained by transcellular proteins forming tight junctions between the epithelial cells. Protected by three layers of mucin, the gut wall forms a non-permeable barrier, keeping digestive enzymes and microorganisms within the luminal space, separate from the blood stream. Microorganisms colonizing the gut may produce bacteriocins in an attempt to outcompete pathogens. Production of bacteriocins in a harsh and complex environment such as the gastro-intestinal tract (GIT) may be below minimal inhibitory concentration (MIC) levels. At such low levels, the stability of bacteriocins may be compromised. Despite this, most bacteria in the gut have the ability to produce bacteriocins, distributed throughout the GIT. With most antimicrobial studies being performed in vitro, we know little about the migration of bacteriocins across epithelial barriers. The behavior of bacteriocins in the GIT is studied ex vivo, using models, flow cells, or membranes resembling the gut wall. Furthermore, little is known about the effect bacteriocins have on the immune system. It is generally believed that the peptides will be destroyed by macrophages once they cross the gut wall. Studies done on the survival of neurotherapeutic peptides and their crossing of the brain-blood barrier, along with other studies on small peptides intravenously injected, may provide some answers. In this review, the stability of bacteriocins in the GIT, their effect on gut epithelial cells, and their ability to cross epithelial cells are discussed. These are important questions to address in the light of recent papers advocating the use of bacteriocins as possible alternatives to, or used in combination with, antibiotics.
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Affiliation(s)
- Leon M. T. Dicks
- Department of Microbiology, Stellenbosch University, Stellenbosch, South Africa
| | - Leané Dreyer
- Department of Microbiology, Stellenbosch University, Stellenbosch, South Africa
| | - Carine Smith
- Department of Physiological Sciences, Stellenbosch University, Stellenbosch, South Africa
| | - Anton D. van Staden
- Department of Microbiology, Stellenbosch University, Stellenbosch, South Africa
- Department of Physiological Sciences, Stellenbosch University, Stellenbosch, South Africa
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142
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Chlorate Specifically Targets Oxidant-Starved, Antibiotic-Tolerant Populations of Pseudomonas aeruginosa Biofilms. mBio 2018; 9:mBio.01400-18. [PMID: 30254119 PMCID: PMC6156191 DOI: 10.1128/mbio.01400-18] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
The anaerobic growth and survival of bacteria are often correlated with physiological tolerance to conventional antibiotics, motivating the development of novel strategies targeting pathogens in anoxic environments. A key challenge is to identify drug targets that are specific to this metabolic state. Chlorate is a nontoxic compound that can be reduced to toxic chlorite by a widespread enzyme of anaerobic metabolism. We tested the antibacterial properties of chlorate against Pseudomonas aeruginosa, a pathogen that can inhabit hypoxic or anoxic microenvironments, including those that arise in human infection. Chlorate and the antibiotic tobramycin kill distinct metabolic populations in P. aeruginosa biofilms, where chlorate targets anaerobic cells that tolerate tobramycin. Chlorate is particularly effective against P. aeruginosalasR mutants, which are frequently isolated from human infections and more resistant to some antibiotics. This work suggests that chlorate may hold potential as an anaerobic prodrug. Nitrate respiration is a widespread mode of anaerobic energy generation used by many bacterial pathogens, and the respiratory nitrate reductase, Nar, has long been known to reduce chlorate to the toxic oxidizing agent chlorite. Here, we demonstrate the antibacterial activity of chlorate against Pseudomonas aeruginosa, a representative pathogen that can inhabit hypoxic or anoxic host microenvironments during infection. Aerobically grown P. aeruginosa cells are tobramycin sensitive but chlorate tolerant. In the absence of oxygen or an alternative electron acceptor, cells are tobramycin tolerant but chlorate sensitive via Nar-dependent reduction. The fact that chlorite, the product of chlorate reduction, is not detected in culture supernatants suggests that it may react rapidly and be retained intracellularly. Tobramycin and chlorate target distinct populations within metabolically stratified aggregate biofilms; tobramycin kills cells on the oxic periphery, whereas chlorate kills hypoxic and anoxic cells in the interior. In a matrix populated by multiple aggregates, tobramycin-mediated death of surface aggregates enables deeper oxygen penetration into the matrix, benefiting select aggregate populations by increasing survival and removing chlorate sensitivity. Finally, lasR mutants, which commonly arise in P. aeruginosa infections and are known to withstand conventional antibiotic treatment, are hypersensitive to chlorate. A lasR mutant shows a propensity to respire nitrate and reduce chlorate more rapidly than the wild type does, consistent with its heightened chlorate sensitivity. These findings illustrate chlorate’s potential to selectively target oxidant-starved pathogens, including physiological states and genotypes of P. aeruginosa that represent antibiotic-tolerant populations during infections.
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143
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Solid-Phase Synthesis and Antibacterial Activity of an Artificial Cyclic Peptide Containing Two Disulfide Bridges. Int J Pept Res Ther 2018. [DOI: 10.1007/s10989-018-9757-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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144
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Travers T, Wang KJ, López CA, Gnanakaran S. Sequence- and structure-based computational analyses of Gram-negative tripartite efflux pumps in the context of bacterial membranes. Res Microbiol 2018; 169:414-424. [DOI: 10.1016/j.resmic.2018.01.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2017] [Revised: 12/28/2017] [Accepted: 01/21/2018] [Indexed: 01/12/2023]
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145
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Blaukopf M, Worrall L, Kosma P, Strynadka NCJ, Withers SG. Insights into Heptosyltransferase I Catalysis and Inhibition through the Structure of Its Ternary Complex. Structure 2018; 26:1399-1407.e5. [PMID: 30122450 DOI: 10.1016/j.str.2018.07.001] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2018] [Revised: 06/06/2018] [Accepted: 07/06/2018] [Indexed: 11/28/2022]
Abstract
Heptosyltransferase I (WaaC) is a highly conserved glycosyltransferase found in Gram-negative bacteria that transfers a heptose residue onto the endotoxin inner core structure (ReLPS) of the outer membrane. Knockouts of WaaC have decreased virulence and increased susceptibility to antibiotics, making WaaC a potential drug target. While previous studies have elucidated the structure of the holoenzyme and a donor analog complex, no information on the binding mode of the acceptor has been available so far. By soaking of a chemically modified functional acceptor, along with a stable donor analog, the crystal structure of a pseudo-ternary complex of WaaC was obtained at 2.3-Å resolution. The acceptor is bound in an unusual horseshoe conformation stabilized by interaction of the anionic carboxylate and phosphate groups at its center and tips with highly conserved Lys and Arg residues. This binding is accompanied by both inter- and intra-domain movements within the protein.
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Affiliation(s)
- Markus Blaukopf
- University of Natural Resources and Life Sciences - Vienna, Department of Chemistry, Muthgasse 18, 1190 Vienna, Austria.
| | - Liam Worrall
- University of British Columbia, Department of Biochemistry and Molecular Biology, Life Sciences Centre, 2350 Health Sciences Mall, Vancouver, BC V6T 1Z3, Canada
| | - Paul Kosma
- University of Natural Resources and Life Sciences - Vienna, Department of Chemistry, Muthgasse 18, 1190 Vienna, Austria
| | - Natalie C J Strynadka
- University of British Columbia, Department of Biochemistry and Molecular Biology, Life Sciences Centre, 2350 Health Sciences Mall, Vancouver, BC V6T 1Z3, Canada
| | - Stephen G Withers
- University of British Columbia, Department of Chemistry, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada
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146
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Burman S, Bhattacharya K, Mukherjee D, Chandra G. Antibacterial efficacy of leaf extracts of Combretum album Pers. against some pathogenic bacteria. BMC COMPLEMENTARY AND ALTERNATIVE MEDICINE 2018; 18:213. [PMID: 29996826 PMCID: PMC6042374 DOI: 10.1186/s12906-018-2271-0] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/24/2018] [Accepted: 06/26/2018] [Indexed: 11/25/2022]
Abstract
Background Plant derived medicines show significant contributions to mankind in treating infections of pathogenic bacteria. Recently plants are used in pharmaceutical industries for novel drug preparations because to ensure efficacy and safety as synthetic antibiotics are threatened for their multidrug resistance. The present study aimed at finding antibacterial potential of aqueous and ethanolic leaf extracts of Combretum album. Methods Antibacterial activity was evaluated against seven bacterial strains by determining minimum inhibitory concentration (MIC) and zone of inhibition. Diameters of the zone of inhibition were compared with standard antibiotics. Preliminary phytochemical screening was done according to standard protocol. FTIR analysis was performed to identify the general phytochemical groups of compounds in the extract. All experiments were conducted in triplicate and values were expressed as the mean ± standard deviation. One-way analysis of variance (ANOVA) and Tukey tests were performed for statistical justification. Results Maximum zones of inhibition were found in case of ethanolic extracts in the following order Bacillus licheniformis (MTCC 530) > Pseudomonas aeruginosa (MTCC 2453) > Bacillus subtilis (MTCC 441) >, Pseudomonas fluorescens (MTCC 103) > Bacillus mycoides (MTCC 7343) > Escherichia coli (MTCC 739) > Pseudomonas putida (MTCC 1654) with zone of inhibition of 27.67 ± 0.33 mm diameter in B. licheniformis (MTCC 530). Qualitatively, the ethanol extract contains flavonoids, tannins and alkaloids. The results of FTIR analysis confirmed the presence of R-CH2-OH groups, aromatics, C-N stretching amine and NH stretching secondary amine. One way ANOVA and Tukey tests statistically justify the data (p ≤ 0.05). Conclusions All the tested leaf extracts showed promising antibacterial activity against both gram positive and gram negative bacteria. Phytochemical screening and FTIR analysis revealed the presence of tannins, alkaloids, R-CH2-OH groups, aromatics and flavonoids in ethanolic leaf extract qualitatively and these compounds could be responsible for antibacterial property of leaf extracts of C. album.
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147
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Antibiotic discovery: combining isolation chip (iChip) technology and co-culture technique. Appl Microbiol Biotechnol 2018; 102:7333-7341. [DOI: 10.1007/s00253-018-9193-0] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2018] [Revised: 05/18/2018] [Accepted: 06/20/2018] [Indexed: 10/28/2022]
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148
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Housseini B Issa K, Phan G, Broutin I. Functional Mechanism of the Efflux Pumps Transcription Regulators From Pseudomonas aeruginosa Based on 3D Structures. Front Mol Biosci 2018; 5:57. [PMID: 29971236 PMCID: PMC6018408 DOI: 10.3389/fmolb.2018.00057] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2018] [Accepted: 05/31/2018] [Indexed: 01/19/2023] Open
Abstract
Bacterial antibiotic resistance is a worldwide health problem that deserves important research attention in order to develop new therapeutic strategies. Recently, the World Health Organization (WHO) classified Pseudomonas aeruginosa as one of the priority bacteria for which new antibiotics are urgently needed. In this opportunistic pathogen, antibiotics efflux is one of the most prevalent mechanisms where the drug is efficiently expulsed through the cell-wall. This resistance mechanism is highly correlated to the expression level of efflux pumps of the resistance-nodulation-cell division (RND) family, which is finely tuned by gene regulators. Thus, it is worthwhile considering the efflux pump regulators of P. aeruginosa as promising therapeutical targets alternative. Several families of regulators have been identified, including activators and repressors that control the genetic expression of the pumps in response to an extracellular signal, such as the presence of the antibiotic or other environmental modifications. In this review, based on different crystallographic structures solved from archetypal bacteria, we will first focus on the molecular mechanism of the regulator families involved in the RND efflux pump expression in P. aeruginosa, which are TetR, LysR, MarR, AraC, and the two-components system (TCS). Finally, the regulators of known structure from P. aeruginosa will be presented.
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Affiliation(s)
- Karim Housseini B Issa
- Laboratoire de Cristallographie et RMN Biologiques (UMR 8015), Centre National de la Recherche Scientifique, Faculté de Pharmacie, Université Paris Descartes, Université Sorbonne Paris Cité, Paris, France
| | - Gilles Phan
- Laboratoire de Cristallographie et RMN Biologiques (UMR 8015), Centre National de la Recherche Scientifique, Faculté de Pharmacie, Université Paris Descartes, Université Sorbonne Paris Cité, Paris, France
| | - Isabelle Broutin
- Laboratoire de Cristallographie et RMN Biologiques (UMR 8015), Centre National de la Recherche Scientifique, Faculté de Pharmacie, Université Paris Descartes, Université Sorbonne Paris Cité, Paris, France
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Biophysical and in silico interaction studies of aporphine alkaloids with Malonyl-CoA: ACP transacylase (FabD) from drug resistant Moraxella catarrhalis. Biochimie 2018; 149:18-33. [DOI: 10.1016/j.biochi.2018.03.012] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2017] [Accepted: 03/21/2018] [Indexed: 01/23/2023]
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150
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Popiołek Ł, Biernasiuk A, Paruch K, Malm A, Wujec M. Synthesis and in vitro antimicrobial activity screening of new pipemidic acid derivatives. Arch Pharm Res 2018; 41:633-645. [PMID: 29619676 PMCID: PMC6028826 DOI: 10.1007/s12272-018-1025-3] [Citation(s) in RCA: 12] [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: 12/22/2017] [Accepted: 03/19/2018] [Indexed: 11/25/2022]
Abstract
This article describes the synthesis and antimicrobial activity evaluation of new pipemidic acid derivatives. New compounds were obtained on the basis of Mannich reaction of 4,5-disubstituted 1,2,4-triazole-3-thiones with pipemidic acid. Antimicrobial tests revealed high antibacterial activity of obtained derivatives. Gram-negative rods belonging to Enterobacteriaceae family were particularly most sensitive to new pipemidic acid derivatives. Synthesized compounds exhibited very strong activity towards Proteus mirabilis ATCC 12453, Salmonella typhimurium ATCC 14028 and Escherichia coli ATCC 25922. The minimum inhibitory concentrations of new pipemidic acid derivatives which inhibited the growth of these bacteria were 0.98-7.81 µg/ml, 0.98-7.81 µg/ml and 0.98-3.91 µg/ml, respectively. The antibacterial activity of newly synthesized pipemidic acid derivatives in many cases was far better than the activity of substances used as positive controls (nitrofurantoin, cefuroxime, ampicillin and pipemidic acid).
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Affiliation(s)
- Łukasz Popiołek
- Department of Organic Chemistry, Faculty of Pharmacy, Medical University of Lublin, 4A Chodźki Street, 20-093, Lublin, Poland.
| | - Anna Biernasiuk
- Department of Pharmaceutical Microbiology, Faculty of Pharmacy, Medical University of Lublin, 1 Chodźki Street, 20-093, Lublin, Poland
| | - Kinga Paruch
- Department of Organic Chemistry, Faculty of Pharmacy, Medical University of Lublin, 4A Chodźki Street, 20-093, Lublin, Poland
| | - Anna Malm
- Department of Pharmaceutical Microbiology, Faculty of Pharmacy, Medical University of Lublin, 1 Chodźki Street, 20-093, Lublin, Poland
| | - Monika Wujec
- Department of Organic Chemistry, Faculty of Pharmacy, Medical University of Lublin, 4A Chodźki Street, 20-093, Lublin, Poland
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