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Bisio A, Schito AM, Pedrelli F, Danton O, Reinhardt JK, Poli G, Tuccinardi T, Bürgi T, De Riccardis F, Giacomini M, Calzia D, Panfoli I, Schito GC, Hamburger M, De Tommasi N. Antibacterial and ATP Synthesis Modulating Compounds from Salvia tingitana. JOURNAL OF NATURAL PRODUCTS 2020; 83:1027-1042. [PMID: 32182064 PMCID: PMC7997632 DOI: 10.1021/acs.jnatprod.9b01024] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2019] [Indexed: 05/05/2023]
Abstract
A surface extract of the aerial parts of Salvia tingitana afforded a nor-sesterterpenoid (1) and eight new sesterterpenoids (2-̵9), along with five known sesterterpenoids, five labdane and one abietane diterpenoid, one sesquiterpenoid, and four flavonoids. The structures of the new compounds were established by 1D and 2D NMR spectroscopy, HRESIMS, and VCD data and Mosher's esters analysis. The antimicrobial activity of compounds was evaluated against 30 human pathogens including 27 clinical strains and three isolates of marine origin for their possible implications on human health. The methyl ester of salvileucolide (10), salvileucolide-6,23-lactone (11), sclareol (15), and manool (17) were the most active against Gram-positive bacteria. The compounds were also tested for the inhibition of ATP production in purified mammalian rod outer segments. Terpenoids 10, 11, 15, and 17 inhibited ATP production, while only 17 inhibited also ATP hydrolysis. Molecular modeling studies confirmed the capacity of 17 to interact with mammalian ATP synthase. A significant reduction of ATP production in the presence of 17 was observed in Enterococcus faecalis and E. faecium isolates.
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Affiliation(s)
- Angela Bisio
- Department
of Pharmacy, University of Genova, Viale Cembrano 4, 16148 Genova, Italy
| | - Anna M. Schito
- Department
of Integrated Surgical and Diagnostical Sciences, University of Genova, Largo Rosanna Benzi 8, 16145 Genova, Italy
| | - Francesca Pedrelli
- Department
of Pharmacy, University of Genova, Viale Cembrano 4, 16148 Genova, Italy
| | - Ombeline Danton
- Department
of Pharmaceutical Sciences, University of
Basel, Klingelbergstrasse 50, 4056 Basel, Switzerland
| | - Jakob K. Reinhardt
- Department
of Pharmaceutical Sciences, University of
Basel, Klingelbergstrasse 50, 4056 Basel, Switzerland
| | - Giulio Poli
- Department
of Pharmacy, University of Pisa, Via Bonanno 6, 56126 Pisa, Italy
| | - Tiziano Tuccinardi
- Department
of Pharmacy, University of Pisa, Via Bonanno 6, 56126 Pisa, Italy
| | - Thomas Bürgi
- Department
of Chemical Physics, University of Geneva, 30 Quai Ernest-Ansermet, 1211 Genève 4, Switzerland
| | - Francesco De Riccardis
- Department
of Chemistry and Biology, University of
Salerno, Via Giovanni Paolo II 132, 84084 Salerno, Italy
| | - Mauro Giacomini
- Department
of Informatics Bioengineering Robotics and System Engineering, University of Genova, Via all’Opera Pia, 13, 16145 Genova, Italy
| | - Daniela Calzia
- Department
of Pharmacy, University of Genova, Viale Cembrano 4, 16148 Genova, Italy
| | - Isabella Panfoli
- Department
of Pharmacy, University of Genova, Viale Cembrano 4, 16148 Genova, Italy
| | - Gian Carlo Schito
- Department
of Pharmacy, University of Genova, Viale Cembrano 4, 16148 Genova, Italy
| | - Matthias Hamburger
- Department
of Pharmaceutical Sciences, University of
Basel, Klingelbergstrasse 50, 4056 Basel, Switzerland
| | - Nunziatina De Tommasi
- Department
of Pharmacy, University of Salerno, Via Giovanni Paolo II 132, 84084 Salerno, Italy
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Marino A, Nostro A, Mandras N, Roana J, Ginestra G, Miceli N, Taviano MF, Gelmini F, Beretta G, Tullio V. Evaluation of antimicrobial activity of the hydrolate of Coridothymus capitatus (L.) Reichenb. fil. (Lamiaceae) alone and in combination with antimicrobial agents. BMC Complement Med Ther 2020; 20:89. [PMID: 32183792 PMCID: PMC7076923 DOI: 10.1186/s12906-020-2877-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2018] [Accepted: 03/04/2020] [Indexed: 11/10/2022] Open
Abstract
Background Hydrolates, complex mixtures containing traces of essential oils (EOs), are inexpensive, easy to make and less toxic than their corresponding EOs. The antibacterial and antifungal activity of the hydrolate of Coridothymus capitatus (L.) Reichenb. fil. (Lamiaceae) alone and in combination with antimicrobial drugs, such as tetracycline and itraconazole, were evaluated. Methods The chemical composition was analysed by gas-chromatography-mass spectrometry (GC-MS). Standard methods were performed to evaluate the susceptibility of some Gram-positive and Gram-negative bacteria, and Candida spp. to the hydrolate, in comparison with its EO. The hydrolate mechanism of action was assayed by propidium iodide and MitoTracker staining. Checkerboard tests were carried out for combinations studies. Results GC-MS identified 0.14% (v/v) of total EO content into hydrolate and carvacrol as a dominant component. The hydrolate showed a good antimicrobial activity against bacteria and yeasts. It exhibited a synergistic effect with itraconazole against Candida krusei, and an additive effect with tetracycline against methicillin-resistant Staphylococcus aureus strains. Hydrolate changed the membranes permeability of bacteria and yeasts and altered mitochondrial function of yeasts. Conclusions Our study extends the knowledge by exploiting non-conventional antimicrobial agents to fight the emergence of antibiotic resistance.
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Affiliation(s)
- Andreana Marino
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Polo Annunziata, 98168, Messina, Italy.
| | - Antonia Nostro
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Polo Annunziata, 98168, Messina, Italy
| | - Narcisa Mandras
- Department of Public Health and Pediatrics, Microbiology Division, University of Turin, Via Santena 9, 10126, Turin, Italy
| | - Janira Roana
- Department of Public Health and Pediatrics, Microbiology Division, University of Turin, Via Santena 9, 10126, Turin, Italy
| | - Giovanna Ginestra
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Polo Annunziata, 98168, Messina, Italy
| | - Natalizia Miceli
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Polo Annunziata, 98168, Messina, Italy
| | - Maria Fernanda Taviano
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Polo Annunziata, 98168, Messina, Italy
| | - Fabrizio Gelmini
- Department of Environmental Science and Policy - ESP, University of Milan, Via Celoria, 2, 20133, Milan, Italy
| | - Giangiacomo Beretta
- Department of Environmental Science and Policy - ESP, University of Milan, Via Celoria, 2, 20133, Milan, Italy
| | - Vivian Tullio
- Department of Public Health and Pediatrics, Microbiology Division, University of Turin, Via Santena 9, 10126, Turin, Italy
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53
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Patil V, Mahajan S, Kulkarni M, Patil K, Rode C, Coronas A, Yi GR. Synthesis of silver nanoparticles colloids in imidazolium halide ionic liquids and their antibacterial activities for gram-positive and gram-negative bacteria. CHEMOSPHERE 2020; 243:125302. [PMID: 31726264 DOI: 10.1016/j.chemosphere.2019.125302] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2019] [Revised: 10/15/2019] [Accepted: 11/02/2019] [Indexed: 06/10/2023]
Abstract
Four 1-butyl-3-methylimidazolium halide ionic liquids were synthesized via metathesis and anion exchange reactions. Silver nanoparticles (AgNPs) colloids were synthesized in four ionic liquids in the pressurized reactor by reduction of silver nitrate with hydrogen gas, without adding solvents or stabilizing agents. Antibacterial activities of base ionic liquids and AgNPs colloids in ionic liquids were reviewed by well-diffusion method for gram-positive Bacillus cereus (NCIM-2155) and gram-negative Escherichia coli (NCIM-2931) bacteria. Antibacterial activities of ionic liquids and AgNPs colloids in ionic liquids were observed to be controlled by ionic liquids anions and AgNPs particle size. The 1-butyl-3-methylimidazolium iodide ionic liquid exhibited higher antibacterial activities among the studied ionic liquids. Further, the presence of AgNPs in 1-butyl-3-methylimidazolium iodide, ionic liquid enhanced its antibacterial activity for Bacillus cereus and Escherichia coli bacteria.
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Affiliation(s)
- Virendra Patil
- School of Chemical Engineering, Sungkyunkwan University, Suwon, 16419, Republic of Korea.
| | - Swapnil Mahajan
- Department of Chemistry, Savitribai Phule Pune University, Ganeshkhind Road, Pune, 411007, India
| | - Mohan Kulkarni
- Department of Chemistry, Savitribai Phule Pune University, Ganeshkhind Road, Pune, 411007, India
| | - Kashinath Patil
- Centre for Materials Characterization Division, CSIR-National Chemical Laboratory, Dr Homi Bhabha Road, Pashan, Pune, 411008, India
| | - Chandrashekhar Rode
- Chemical Engineering and Process Development Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pashan, Pune, 411008, India
| | - Alberto Coronas
- Rovira I Virgili University, Mechanical Engineering Dept., Av. Països Catalans, 26, 43007, Tarragona, Spain
| | - Gi-Ra Yi
- School of Chemical Engineering, Sungkyunkwan University, Suwon, 16419, Republic of Korea
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Reiter J, Borlinghaus J, Dörner P, Schröder W, Gruhlke MC, Klaas M, Slusarenko AJ. Investigation of the deposition behaviour and antibacterial effectivity of allicin aerosols and vapour using a lung model. Exp Ther Med 2020; 19:1541-1549. [PMID: 32010336 PMCID: PMC6966168 DOI: 10.3892/etm.2019.8387] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2019] [Accepted: 09/25/2019] [Indexed: 12/18/2022] Open
Abstract
Allicin is a natural antibiotic produced by garlic as a defence against pathogens and pests. Due to the worldwide increase in antibiotic resistance, new antibiotics are desperately required. Allicin is such a candidate and is active against several multidrug-resistant (MDR) strains of human pathogens, including methicillin-resistant Staphylococcus aureus (MRSA). When administered orally, allicin is titrated out by glutathione in the cells and blood, and effective therapeutic concentrations are difficult to achieve at the site of an infection. However, in the case of lung infections, allicin can be delivered directly to pathogens via the pulmonary route. In this study, we designed and constructed an in vitro lung test rig, which allowed us to model accurately the exposure of lung air-passage surfaces to allicin and gentamicin, in order to examine the feasibility of combating lung infections by direct inhalation. A prototype test rig of lung bronchi with three bifurcations was constructed, which could be coated internally with a thin layer of bacteria-seeded agar medium. The deposition of antimicrobial aerosols on the modelled bronchial surfaces was followed in preliminary tests without the need for animal experiments. The differential sensitivity of the test bacteria to different antibiotics and the dose-dependency of inhibition was shown using the model. Furthermore, a synergistic effect of allicin vapour and ethanol in inhibiting bacterial growth was demonstrated. The modelling of the axial velocity air-flow distribution correlated with the regions indicating the inhibition of bacterial growth, demonstrating that the model has predictive value and can reduce the requirement for animal sacrifice in pre-clinical trials of novel antibiotics.
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Affiliation(s)
- Jana Reiter
- Department of Plant Physiology (Bio3), RWTH Aachen University, D-52074 Aachen, Germany
| | - Jan Borlinghaus
- Department of Plant Physiology (Bio3), RWTH Aachen University, D-52074 Aachen, Germany
| | - Philipp Dörner
- Institute of Aerodynamics, RWTH Aachen University, D-52074 Aachen, Germany
| | - Wolfgang Schröder
- Institute of Aerodynamics, RWTH Aachen University, D-52074 Aachen, Germany
| | - Martin C.H. Gruhlke
- Department of Plant Physiology (Bio3), RWTH Aachen University, D-52074 Aachen, Germany
| | - Michael Klaas
- Institute of Aerodynamics, RWTH Aachen University, D-52074 Aachen, Germany
| | - Alan J. Slusarenko
- Department of Plant Physiology (Bio3), RWTH Aachen University, D-52074 Aachen, Germany
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55
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Khan M, Alkhathlan HZ, Khan ST. Antibiotic and Antibiofilm Activities of Salvadora persica L. Essential Oils against Streptococcus mutans: A Detailed Comparative Study with Chlorhexidine Digluconate. Pathogens 2020; 9:pathogens9010066. [PMID: 31963342 PMCID: PMC7169458 DOI: 10.3390/pathogens9010066] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2019] [Revised: 01/13/2020] [Accepted: 01/14/2020] [Indexed: 12/20/2022] Open
Abstract
The use of organic components from plants as an alternative antimicrobial agent is becoming popular due to the development of drug-resistance in various pathogens. Essential oils from fresh (MF-1) and dried (MD-1) roots of Salvadora persica L. were extracted and benzyl isothiocynate was determined as their chief constituent using GC-MS and GC-FID. The antibiofilm and antimicrobial activities of MD-1 and MF-1 against Streptococcus mutans a dental caries causing bacteria were determined using multiple assays. These activities were compared with chlorhexidine digluconate (CHX) and clove oil, well known antimicrobial agents for oral hygiene. Essential oils demonstrated IC50 values (10–11 µg/mL) comparable to that of CHX, showed a significant reduction (82 ± 7–87 ± 6%) of the biofilm formation at a very low concentration. These results were supported by RT-PCR studies showing change in the expression levels of AtlE, gtfB, ymcA and sodA genes involved in autolysis, biofilm formation and oxidative stress, respectively. The results presented in this study show the robust bactericidal and antibiofilm activity of MD-1 and MF-1 against S. mutans which is comparable to Chlorhexidine digluconate. Our results suggest that these essential oils can be as effective as CHX and hence can serve as a good alternative antimicrobial agent for oral hygiene.
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Affiliation(s)
- Merajuddin Khan
- Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia; (M.K.); (H.Z.A.)
| | - Hamad Z. Alkhathlan
- Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia; (M.K.); (H.Z.A.)
| | - Shams Tabrez Khan
- Department of Agricultural Microbiology, Aligarh Muslim University, Aligarh 2002002 UP, India
- Correspondence:
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Antimicrobial efficacy and toxicity of novel CAMPs against P. aeruginosa infection in a murine skin wound infection model. BMC Microbiol 2019; 19:293. [PMID: 31842727 PMCID: PMC6915932 DOI: 10.1186/s12866-019-1657-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2019] [Accepted: 11/20/2019] [Indexed: 01/08/2023] Open
Abstract
Background Treatment of P. aeruginosa wound infection is challenging due to its inherent and acquired resistance to many conventional antibiotics. Cationic antimicrobial peptides (CAMPs) with distinct modes of antimicrobial action have been considered as the next-generation therapeutic agents. In the present study, a murine skin surgical wound infection model was used to evaluate the in vivo toxicity and efficacy of two newly designed antimicrobial peptides (CAMP-A and CAMP-B), as chemotherapeutic agents to combat P. aeruginosa infection. Results In the first trial, topical application of CAMPs on the wounds at a dose equivalent to 4 × MIC for 7 consecutive days did not cause any significant changes in the physical activities, hematologic and plasma biochemical parameters, or histology of systemic organs of the treated mice. Daily treatment of infected wounds with CAMP-A and CAMP-B for 5 days at a dose equivalent to 2× MIC resulted in a significant reduction in wound bacterial burden (CAMP-A: 4.3 log10CFU/g of tissue and CAMP-B: 5.8 log10CFU/g of tissue), compared to that of the mock-treated group (8.1 log10CFU/g of tissue). Treatment with CAMPs significantly promoted wound closure and induced epidermal cell proliferation. Topical application of CAMP-A on wounds completely prevented systemic dissemination of P. aeruginosa while CAMP-B blocked systemic infection in 67% of mice and delayed the onset of systemic infection by at least 2 days in the rest of the mice (33%). In a second trial, daily application of CAMP-A at higher doses (5× MIC and 50× MIC) didn’t show any significant toxic effect on mice and the treatments with CAMP-A further reduced wound bacterial burden (5× MIC: 4.5 log10CFU/g of tissue and 50× MIC: 3.8 log10CFU/g of tissue). Conclusions The data collectively indicated that CAMPs significantly reduced wound bacterial load, promoted wound healing, and prevented hepatic dissemination. CAMP-A is a promising alternative to commonly used antibiotics to treat P. aeruginosa skin infection.
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57
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Giri P, Delvadia P, Ladani MK, Prajapati N, Joshi V, Giri S, Patel N, Jain MR, Srinivas NR. Relevance of preclinical rodent pharmacokinetics in the selection of a companion antibiotic for combining with beta-lactamase inhibitor. Xenobiotica 2019; 50:815-821. [PMID: 31755347 DOI: 10.1080/00498254.2019.1696494] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Recent approvals of beta-lactamase inhibitor (BLI) drug in combination with cephalosporins/penems have provided the right impetus for novel BLIs. One important research question, hitherto not addressed, is pertaining to the relevance of preclinical pharmacokinetics for pairing the antibiotic with existing/novel BLI.Two BLI combination drugs: (a) approved (i.e. ceftazidime/avibactam); (b) clinical development (i.e. cefepime/zidebactam) were explored to provide insights to address the research question.Individual intravenous dosing of ceftazidime, avibactam, cefepime and zidebactam was done at 1 mg/kg by intravenous route in Balb/c mice and Wistar rats. Serial blood samples were collected and analysed by LC-MS/MS method.Examination of the ratios of pharmacokinetic parameters (CL, VSS and T1/2) for individual drugs in combinations (for instance, CL (ceftazidime)/CL (avibactam); CL (cefepime)/CL (zidebactam)) suggested that the pharmacokinetic data gathered in rats were generally within 0.5- to 2-fold; but mouse data revealed larger disparity for VSS (0.11- to 8.25-fold) or CL (0.49- to 4.03-fold).The observed ratio for CL/VSS observed in rats agreed with corresponding human ratios for the pairwise comparison of the individual drugs in the combinations.Retrospectively, current pharmacokinetic findings suggest rat pharmacokinetic data may aid the combination of BLI with an appropriate antibiotic.
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Affiliation(s)
- Poonam Giri
- Department of Drug Metabolism and Pharmacokinetics, Zydus Research Centre, Ahmadabad, India
| | - Prashant Delvadia
- Department of Drug Metabolism and Pharmacokinetics, Zydus Research Centre, Ahmadabad, India
| | - Meera K Ladani
- Department of Drug Metabolism and Pharmacokinetics, Zydus Research Centre, Ahmadabad, India
| | - Namrata Prajapati
- Department of Drug Metabolism and Pharmacokinetics, Zydus Research Centre, Ahmadabad, India
| | - Vipul Joshi
- Department of Drug Metabolism and Pharmacokinetics, Zydus Research Centre, Ahmadabad, India
| | - Shyamkumar Giri
- Department of Drug Metabolism and Pharmacokinetics, Zydus Research Centre, Ahmadabad, India
| | - Nirmal Patel
- Department of Drug Metabolism and Pharmacokinetics, Zydus Research Centre, Ahmadabad, India
| | - Mukul R Jain
- Department of Drug Metabolism and Pharmacokinetics, Zydus Research Centre, Ahmadabad, India.,Department of Pharmacology and Toxicology, Zydus Research Centre, Ahmadabad, India
| | - Nuggehally R Srinivas
- Department of Drug Metabolism and Pharmacokinetics, Zydus Research Centre, Ahmadabad, India
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Demain AL, Gómez-Ortiz B, Ruiz-Villafán B, Rodríguez-Sanoja R, Sánchez S. Recent findings of molecules with anti-infective activity: screening of non-conventional sources. Curr Opin Pharmacol 2019; 48:40-47. [DOI: 10.1016/j.coph.2019.04.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2019] [Revised: 03/29/2019] [Accepted: 04/01/2019] [Indexed: 10/26/2022]
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Lima R, Del Fiol FS, Balcão VM. Prospects for the Use of New Technologies to Combat Multidrug-Resistant Bacteria. Front Pharmacol 2019; 10:692. [PMID: 31293420 PMCID: PMC6598392 DOI: 10.3389/fphar.2019.00692] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2019] [Accepted: 05/28/2019] [Indexed: 12/18/2022] Open
Abstract
The increasing use of antibiotics is being driven by factors such as the aging of the population, increased occurrence of infections, and greater prevalence of chronic diseases that require antimicrobial treatment. The excessive and unnecessary use of antibiotics in humans has led to the emergence of bacteria resistant to the antibiotics currently available, as well as to the selective development of other microorganisms, hence contributing to the widespread dissemination of resistance genes at the environmental level. Due to this, attempts are being made to develop new techniques to combat resistant bacteria, among them the use of strictly lytic bacteriophage particles, CRISPR-Cas, and nanotechnology. The use of these technologies, alone or in combination, is promising for solving a problem that humanity faces today and that could lead to human extinction: the domination of pathogenic bacteria resistant to artificial drugs. This prospective paper discusses the potential of bacteriophage particles, CRISPR-Cas, and nanotechnology for use in combating human (bacterial) infections.
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Affiliation(s)
- Renata Lima
- LABiToN-Laboratory of Bioactivity Assessment and Toxicology of Nanomaterials, University of Sorocaba, Sorocaba, Brazil
| | - Fernando Sá Del Fiol
- CRIA-Antibiotic Reference and Information Center, University of Sorocaba, Sorocaba, Brazil
| | - Victor M Balcão
- PhageLab-Laboratory of Biofilms and Bacteriophages, i(bs)2-intelligent biosensing and biomolecule stabilization research group, University of Sorocaba, Sorocaba, Brazil.,Department of Biology and CESAM, University of Aveiro, Campus Universitário de Santiago, Aveiro, Portugal
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60
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Kegere J, Ouf A, Siam R, Mamdouh W. Fabrication of Poly(vinyl alcohol)/Chitosan/ Bidens pilosa Composite Electrospun Nanofibers with Enhanced Antibacterial Activities. ACS OMEGA 2019; 4:8778-8785. [PMID: 31459967 PMCID: PMC6648370 DOI: 10.1021/acsomega.9b00204] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2019] [Accepted: 05/10/2019] [Indexed: 05/03/2023]
Abstract
Due to the current challenges faced by the increasing rate of drug-resistant bacteria, attention is gradually shifting from synthetic antimicrobial chemical compounds to natural products that are ecofriendly with a wide spectrum of properties. The aim of this research was to successfully fabricate electrospun nanofibers from poly(vinyl alcohol) (PVA), PVA blended with Bidens pilosa and chitosan composite blends and investigate their potential antibacterial activities against Escherichia coli and Staphylococcus aureus. Fabrication of nanofibers was performed by the electrospinning technique, which applies high voltage on the polymer, forcing it to spin off as a jet onto a plate collector. Characterization of the nanofibers was successfully performed by scanning electron microscopy and Fourier transform infrared spectroscopy. Antibacterial assessment was carried out by colony forming unit enumeration. The results obtained revealed a 12% increase in growth inhibition of bacteria in composite nanofibers as compared with their parental forms, which were >91 and 79%, respectively. Chitosan nanofibers have been extensively researched, and their antibacterial properties have been studied. However B. pilosa antibacterial properties in a nanofiber form have not been previously reported. These composite nanofibers open new avenues toward using natural materials as potent antibacterial agents.
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Affiliation(s)
- James Kegere
- Department
of Chemistry, School of Sciences and Engineering (SSE) and Department of
Biology and Biotechnology Graduate Program, School of Sciences and
Engineering (SSE), The American University
in Cairo (AUC), AUC Avenue, P.O. Box 74, New Cairo 11835, Egypt
| | - Amged Ouf
- Department
of Chemistry, School of Sciences and Engineering (SSE) and Department of
Biology and Biotechnology Graduate Program, School of Sciences and
Engineering (SSE), The American University
in Cairo (AUC), AUC Avenue, P.O. Box 74, New Cairo 11835, Egypt
| | - Rania Siam
- Department
of Chemistry, School of Sciences and Engineering (SSE) and Department of
Biology and Biotechnology Graduate Program, School of Sciences and
Engineering (SSE), The American University
in Cairo (AUC), AUC Avenue, P.O. Box 74, New Cairo 11835, Egypt
| | - Wael Mamdouh
- Department
of Chemistry, School of Sciences and Engineering (SSE) and Department of
Biology and Biotechnology Graduate Program, School of Sciences and
Engineering (SSE), The American University
in Cairo (AUC), AUC Avenue, P.O. Box 74, New Cairo 11835, Egypt
- E-mail:
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61
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Identification and Quantification of Related Impurities of a Novel Ketolide Antibiotic Nafithromycin. Chromatographia 2019. [DOI: 10.1007/s10337-019-03743-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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62
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Li Y, Gardner JJ, Fortney KR, Leus IV, Bonifay V, Zgurskaya HI, Pletnev AA, Zhang S, Zhang ZY, Gribble GW, Spinola SM, Duerfeldt AS. First-generation structure-activity relationship studies of 2,3,4,9-tetrahydro-1H-carbazol-1-amines as CpxA phosphatase inhibitors. Bioorg Med Chem Lett 2019; 29:1836-1841. [PMID: 31104993 DOI: 10.1016/j.bmcl.2019.05.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2019] [Revised: 05/02/2019] [Accepted: 05/03/2019] [Indexed: 12/26/2022]
Abstract
Genetic activation of the bacterial two-component signal transduction system, CpxRA, abolishes the virulence of a number of pathogens in human and murine infection models. Recently, 2,3,4,9-tetrahydro-1H-carbazol-1-amines were shown to activate the CpxRA system by inhibiting the phosphatase activity of CpxA. Herein we report the initial structure-activity relationships of this scaffold by focusing on three approaches 1) A-ring substitution, 2) B-ring deconstruction to provide N-arylated amino acid derivatives, and 3) C-ring elimination to give 2-ethylamino substituted indoles. These studies demonstrate that the A-ring is amenable to functionalization and provides a promising avenue for continued optimization of this chemotype. Further investigations revealed that the C-ring is not necessary for activity, although it likely provides conformational constraint that is beneficial to potency, and that the (R) stereochemistry is required at the primary amine. Simplification of the scaffold through deconstruction of the B-ring led to inactive compounds, highlighting the importance of the indole core. A new lead compound 26 was identified, which manifests a ∼30-fold improvement in CpxA phosphatase inhibition over the initial hit. Comparison of amino and des-amino derivatives in bacterial strains differing in membrane permeability and efflux capabilities demonstrate that the amine is required not only for target engagement but also for permeation and accumulation in Escherichia coli.
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Affiliation(s)
- Yangxiong Li
- Institute for Natural Products Applications and Research Technologies, Norman, OK 73019-5251, United States; Department of Chemistry & Biochemistry, Stephenson Life Sciences Research Center, Norman, OK 73019-5251, United States
| | - Jessi J Gardner
- Institute for Natural Products Applications and Research Technologies, Norman, OK 73019-5251, United States; Department of Chemistry & Biochemistry, Stephenson Life Sciences Research Center, Norman, OK 73019-5251, United States
| | - Katherine R Fortney
- Departments of Microbiology and Immunology, Indiana University School of Medicine, Indianapolis, IN 46202, United States
| | - Inga V Leus
- Department of Chemistry & Biochemistry, Stephenson Life Sciences Research Center, Norman, OK 73019-5251, United States
| | - Vincent Bonifay
- Department of Chemistry & Biochemistry, Stephenson Life Sciences Research Center, Norman, OK 73019-5251, United States
| | - Helen I Zgurskaya
- Department of Chemistry & Biochemistry, Stephenson Life Sciences Research Center, Norman, OK 73019-5251, United States
| | - Alexandre A Pletnev
- Department of Chemistry, Dartmouth College, Hanover New Hampshire, 03755, United States
| | - Sheng Zhang
- Biochemistry, Indiana University School of Medicine, Indianapolis, IN 46202, United States
| | - Zhong-Yin Zhang
- Biochemistry, Indiana University School of Medicine, Indianapolis, IN 46202, United States; Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, West Lafayette, IN 47907, United States; The Institute for Drug Discovery, Purdue University, West Lafayette, IN 47907, United States
| | - Gordon W Gribble
- Department of Chemistry, Dartmouth College, Hanover New Hampshire, 03755, United States
| | - Stanley M Spinola
- Departments of Microbiology and Immunology, Indiana University School of Medicine, Indianapolis, IN 46202, United States; Medicine, Indiana University School of Medicine, Indianapolis, IN 46202, United States; Pathology and Laboratory Medicine, Indiana University School of Medicine, Indianapolis, IN 46202, United States
| | - Adam S Duerfeldt
- Institute for Natural Products Applications and Research Technologies, Norman, OK 73019-5251, United States; Department of Chemistry & Biochemistry, Stephenson Life Sciences Research Center, Norman, OK 73019-5251, United States.
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Lopes FES, da Costa HPS, Souza PFN, Oliveira JPB, Ramos MV, Freire JEC, Jucá TL, Freitas CDT. Peptide from thaumatin plant protein exhibits selective anticandidal activity by inducing apoptosis via membrane receptor. PHYTOCHEMISTRY 2019; 159:46-55. [PMID: 30577001 DOI: 10.1016/j.phytochem.2018.12.006] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2018] [Revised: 12/10/2018] [Accepted: 12/11/2018] [Indexed: 06/09/2023]
Abstract
Osmotin- and thaumatin-like proteins (OLPs and TLPs) have been associated with plant defense responses to different biotic stresses. In the present work, several in silico sequences from OLPs and TLPs were investigated by means of bioinformatics tools aiming to prospect for antimicrobial peptides. The peptide sequences chosen were further synthesized and characterized, and their activities and action mechanisms were assayed against some phytopathogenic fungi, bacteria and yeasts of clinical importance. From this survey approach, four peptide sequences (GDCKATSC, CPRALKVPGGCN, IVGQCPAKLKA, and CAADIVGQCPAKLK) were selected considering some chemical parameters commonly attributed to antimicrobial peptides. Antimicrobial assays showed that these peptides were unable to inhibit mycelial growth of phytopathogenic fungi and they did not affect bacterial cell growth. Nevertheless, significant inhibitory activity was found for CPRALKVPGGCN and CAADIVGQCPAKLK against Candida albicans and Saccharomyces cerevisiae. Fluorescence and scanning electron microscopy assays suggested that CAADIVGQCPAKLK did not damage the overall cell structure, or its activity was negligible on yeast membrane and cell wall integrity. However, it induced the production of reactive oxygen species (ROS) and apoptosis. Molecular docking analysis showed that CAADIVGQCPAKLK had strong affinity to interact with specific plasma membrane receptors of C. albicans and S. cerevisiae, which have been described as promoting the induction of apoptosis. The results indicate that CAADIVGQCPAKLK can be a valuable target for the development of a desired antimicrobial agent against the pathogen C. albicans.
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Affiliation(s)
- Francisco E S Lopes
- Universidade Federal do Ceará, Departamento de Bioquímica e Biologia Molecular, CEP 60.440-970, Fortaleza, Ceará, Brazil
| | - Helen P S da Costa
- Universidade Federal do Ceará, Departamento de Bioquímica e Biologia Molecular, CEP 60.440-970, Fortaleza, Ceará, Brazil
| | - Pedro F N Souza
- Nebraska Center for Virology, University of Nebraska-Lincoln, Lincoln, NE, USA
| | - João P B Oliveira
- Universidade Federal do Ceará, Departamento de Bioquímica e Biologia Molecular, CEP 60.440-970, Fortaleza, Ceará, Brazil
| | - Márcio V Ramos
- Universidade Federal do Ceará, Departamento de Bioquímica e Biologia Molecular, CEP 60.440-970, Fortaleza, Ceará, Brazil
| | - José E C Freire
- Faculdade UniNassau, Campus Parangaba, Av. Dr. Silas Munguba, 403-433, Parangaba, Fortaleza, Ceará, Brazil
| | - Thiago L Jucá
- Refinaria de Lubrificantes e Derivados do Nordeste (Lubnor), Petrobras, Fortaleza, Ceará, Brazil
| | - Cleverson D T Freitas
- Universidade Federal do Ceará, Departamento de Bioquímica e Biologia Molecular, CEP 60.440-970, Fortaleza, Ceará, Brazil.
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Kang M, Kim S, Kim H, Song Y, Jung D, Kang S, Seo JH, Nam S, Lee Y. Calcium-Binding Polymer-Coated Poly(lactide- co-glycolide) Microparticles for Sustained Release of Quorum Sensing Inhibitors to Prevent Biofilm Formation on Hydroxyapatite Surfaces. ACS APPLIED MATERIALS & INTERFACES 2019; 11:7686-7694. [PMID: 30768237 DOI: 10.1021/acsami.8b18301] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Quorum sensing (QS) inhibitor-based therapy is an attractive strategy to inhibit bacterial biofilm formation without excessive induction of antibiotic resistance. Thus, we designed Ca2+-binding poly(lactide- co-glycolide) (PLGA) microparticles that can maintain a sufficient concentration of QS inhibitors around hydroxyapatite (HA) surfaces in order to prevent biofilm formation on HA-based dental or bone tissues or implants and, therefore, subsequent pathogenesis. Poly(butyl methacrylate- co-methacryloyloxyethyl phosphate) (PBMP) contains both Ca2+-binding phosphomonoester groups and PLGA-interacting butyl groups. The PBMP-coated PLGA (PLGA/PBMP) microparticles exhibited superior adhesion to HA surfaces without altering the sustained release properties of uncoated PLGA microparticles. PLGA/PBMP microparticle-encapsulating furanone C-30, a representative QS inhibitor, effectively inhibited the growth of Streptococcus mutans and its ability to form biofilms on HA surface for prolonged periods of up to 100 h, which was much longer than either furanone C-30 in its free form or when encapsulated in noncoated PLGA microparticles.
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Affiliation(s)
- Minji Kang
- Department of Chemistry, College of Natural Sciences , Seoul National University , Gwanak-ro 1 , Gwanak-gu, Seoul 08826 , Republic of Korea
| | - Sungwhan Kim
- Department of Chemistry, College of Natural Sciences , Seoul National University , Gwanak-ro 1 , Gwanak-gu, Seoul 08826 , Republic of Korea
| | - Heejin Kim
- Department of Chemistry, College of Natural Sciences , Seoul National University , Gwanak-ro 1 , Gwanak-gu, Seoul 08826 , Republic of Korea
| | - Youngjun Song
- Department of Chemistry, College of Natural Sciences , Seoul National University , Gwanak-ro 1 , Gwanak-gu, Seoul 08826 , Republic of Korea
| | - Dongwook Jung
- Department of Chemistry, College of Natural Sciences , Seoul National University , Gwanak-ro 1 , Gwanak-gu, Seoul 08826 , Republic of Korea
| | - Sunah Kang
- Department of Chemistry, College of Natural Sciences , Seoul National University , Gwanak-ro 1 , Gwanak-gu, Seoul 08826 , Republic of Korea
| | - Ji-Hun Seo
- Department of Materials Science and Engineering , Korea University , 145 Anam-ro , Seongbuk-gu, Seoul 02841 , Republic of Korea
| | - Sohee Nam
- Department of Chemistry, College of Natural Sciences , Seoul National University , Gwanak-ro 1 , Gwanak-gu, Seoul 08826 , Republic of Korea
| | - Yan Lee
- Department of Chemistry, College of Natural Sciences , Seoul National University , Gwanak-ro 1 , Gwanak-gu, Seoul 08826 , Republic of Korea
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O'Brien KS, Emerson P, Hooper PJ, Reingold AL, Dennis EG, Keenan JD, Lietman TM, Oldenburg CE. Antimicrobial resistance following mass azithromycin distribution for trachoma: a systematic review. THE LANCET. INFECTIOUS DISEASES 2019; 19:e14-e25. [PMID: 30292480 DOI: 10.1016/s1473-3099(18)30444-4] [Citation(s) in RCA: 85] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Revised: 06/21/2018] [Accepted: 07/10/2018] [Indexed: 01/12/2023]
Abstract
Mass azithromycin distribution is a core component of trachoma control programmes and could reduce mortality in children younger than 5 years in some settings. In this systematic review we synthesise evidence on the emergence of antimicrobial resistance after mass azithromycin distribution. We searched electronic databases for publications up to June 14, 2018. We included studies of any type (excluding modelling studies, surveillance reports, and review articles) on community-wide distribution of oral azithromycin for the prevention and treatment of trachoma that assessed macrolide resistance, without restrictions to the type of organism. We extracted prevalence of resistance from published reports and requested unpublished data from authors of included studies. Of 213 identified studies, 19 met inclusion criteria (12 assessed Streptococcus pneumoniae) and were used for qualitative synthesis. Macrolide resistance after azithromycin distribution was reported in three of the five organisms studied. The lack of resistance in Chlamydia trachomatis suggests that azithromycin might remain effective for trachoma programmes, but evidence is scarce. As mass azithromycin distribution for trachoma continues and is considered for other indications, ongoing monitoring of antimicrobial resistance will be required.
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Affiliation(s)
- Kieran S O'Brien
- Francis I Proctor Foundation, University of California, San Francisco, CA, USA; Division of Epidemiology, University of California, Berkeley, CA, USA
| | - Paul Emerson
- International Trachoma Initiative, Decatur, GA, USA
| | - P J Hooper
- International Trachoma Initiative, Decatur, GA, USA
| | - Arthur L Reingold
- Division of Epidemiology, University of California, Berkeley, CA, USA
| | - Elena G Dennis
- Francis I Proctor Foundation, University of California, San Francisco, CA, USA
| | - Jeremy D Keenan
- Francis I Proctor Foundation, University of California, San Francisco, CA, USA; Department of Ophthalmology, University of California, San Francisco, CA, USA
| | - Thomas M Lietman
- Francis I Proctor Foundation, University of California, San Francisco, CA, USA; Department of Ophthalmology, University of California, San Francisco, CA, USA; Department of Epidemiology & Biostatistics, University of California, San Francisco, CA, USA
| | - Catherine E Oldenburg
- Francis I Proctor Foundation, University of California, San Francisco, CA, USA; Department of Epidemiology & Biostatistics, University of California, San Francisco, CA, USA.
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66
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Hey SP, Kesselheim AS. Reprioritizing Research Activity for the Post-Antibiotic Era: Ethical, Legal, and Social Considerations. Hastings Cent Rep 2018; 47:16-20. [PMID: 28301705 DOI: 10.1002/hast.685] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Many hold that the so-called golden era of antibiotic discovery has passed, leaving only a limited clinical pipeline for new antibiotics. A logical conclusion of such arguments is that we need to reform the current system of antibiotic drug research-including clinical trials and regulatory requirements-to spur activity in discovery and development. The United States Congress in the past few years has debated a number of bills to address this crisis, including the 2012 Generating Antibiotic Incentives Now Act and the 2016 21st Century Cures Act. Experts have also sought to advance antibiotic development by encouraging greater use of trials with noninferiority hypotheses, which are thought to be easier to conduct. The goal underlying these proposals is to stave off the post-antibiotic era by expanding the pharmaceutical armamentarium as quickly as possible. But although new antibiotic agents are necessary to combat the long-term threat of drug-resistant disease, we argue that these research policies, which effectively lower the bar for antibiotic approval, are ethically problematic. Rather, given broader public health considerations related to the full lifecycle of antibiotic use-including development of resistance-we should reject an overly permissive approach to new antibiotic approval and instead set the bar for regulatory approval at a point that will naturally direct research resources toward the most transformative chemical or social interventions.
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Bacillamidins A⁻G from a Marine-Derived Bacillus pumilus. Mar Drugs 2018; 16:md16090326. [PMID: 30208577 PMCID: PMC6164710 DOI: 10.3390/md16090326] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2018] [Revised: 09/07/2018] [Accepted: 09/07/2018] [Indexed: 11/17/2022] Open
Abstract
Seven long-chain amides, including five previously undescribed bacillamidins A–E (1–5) and two previously reported synthetic analogs, bacillamidins F (6) and G (7), were isolated from extracts of the marine-derived Bacillus pumilus strain RJA1515. The structures of the new compounds were established by extensive analysis of 1D and 2D nuclear magnetic resonance (NMR) data as well as high resolution mass spectrometry (HRMS), and the absolute configurations of the stereogenic carbons of 1–4 were established by comparison of the calculated and the experimental electronic circular dichroism (ECD) spectra. The cytotoxic and antimicrobial activities of 1–7 were evaluated.
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69
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Uddin MJ, Easwaran M, Ahn J. Characterization of bacteriophages specificity for antibiotic-resistant Salmonella typhimurium. ANN MICROBIOL 2018. [DOI: 10.1007/s13213-018-1370-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
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70
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Taleb MH, Abdeltawab NF, Shamma RN, Abdelgayed SS, Mohamed SS, Farag MA, Ramadan MA. Origanum vulgare L. Essential Oil as a Potential Anti-Acne Topical Nanoemulsion-In Vitro and In Vivo Study. Molecules 2018; 23:E2164. [PMID: 30154336 PMCID: PMC6225355 DOI: 10.3390/molecules23092164] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2018] [Revised: 08/10/2018] [Accepted: 08/20/2018] [Indexed: 11/26/2022] Open
Abstract
Antibiotics are often prescribed in acne treatment; however, Propionibacterium acnes and Staphylococcus epidermidis, the two of the major acne-associated bacteria, developed antibiotic resistance. Essential oils (EOs) present a natural, safe, efficacious and multifunctional alternative treatment. This study aimed to assess the potential anti-acne activity of selected seven EOs commonly used in Mediterranean folk medicine. Antimicrobial activity screening of these oils showed oregano to exhibit the strongest antimicrobial activity with minimum inhibitory concentration (MIC) of 0.34 mg/mL and minimum bactericidal concentration (MBC) of 0.67 mg/mL against P. acnes; and MIC of 0.67 mg/mL and MBC of 1.34 mg/mL against S. epidermidis. The composition of the most effective EOs (oregano and thyme) was determined using gas chromatography-mass spectrometry (GC-MS). Monoterpenoid phenols predominated oregano and thyme EO with thymol percentile 99 and 72, respectively. Thymol showed MIC 0.70 mg/mL against both P. acnes and S. epidermidis whereas MBC was 1.40 and 2.80 mg/mL against P. acnes and S. epidermidis, respectively. Moreover, oregano exhibited the strongest anti-biofilm effect against S. epidermidis with MBIC 1.34 mg/mL and killing dynamic time of 12 and 8 h against P. acnes and S. epidermidis, respectively. Oregano, the most effective EO, was formulated and tested as a nanoemulsion in an acne animal mouse model. The formulation showed superior healing and antimicrobial effects compared to the reference antibiotic. Collectively, our data suggested that oregano oil nanoemulsion is a potential natural and effective alternative for treating acne and overcoming the emerging antibiotic resistance.
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Affiliation(s)
- Mohammed H Taleb
- Department of Microbiology and Immunology, Faculty of Pharmacy, Cairo University, Cairo 11562, Egypt.
- Department of Pharmaceutics and Pharmaceutical Technology, Faculty of Pharmacy, Al-Azhar University⁻Gaza, PO Box 1277, Gaza 79702, Palestine.
| | - Nourtan F Abdeltawab
- Department of Microbiology and Immunology, Faculty of Pharmacy, Cairo University, Cairo 11562, Egypt.
| | - Rehab N Shamma
- Department of Pharmaceutics and Industrial pharmacy, Faculty of Pharmacy, Cairo University, Cairo 11562, Egypt.
| | - Sherein S Abdelgayed
- Department of Pathology, Faculty of Veterinary Medicine, Cairo University, Cairo 12211, Egypt.
| | - Sarah S Mohamed
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Cairo University, Cairo 11562, Egypt.
| | - Mohamed A Farag
- Department of Pharmacognosy, Faculty of Pharmacy, Cairo University, Cairo 11562, Egypt.
- Department of Chemistry, School of Sciences & Engineering, The American University in Cairo, Cairo 11853, Egypt.
| | - Mohammed A Ramadan
- Department of Microbiology and Immunology, Faculty of Pharmacy, Cairo University, Cairo 11562, Egypt.
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Parallel Evolution of Host-Attachment Proteins in Phage PP01 Populations Adapting to Escherichia coli O157:H7. Pharmaceuticals (Basel) 2018; 11:ph11020060. [PMID: 29925767 PMCID: PMC6027323 DOI: 10.3390/ph11020060] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2018] [Revised: 06/07/2018] [Accepted: 06/11/2018] [Indexed: 12/14/2022] Open
Abstract
The emergence of antibiotic resistance has sparked interest in phage therapy, which uses virulent phages as antibacterial agents. Bacteriophage PP01 has been studied for potential bio-control of Escherichia coli O157:H7, its natural host, but in the laboratory, PP01 can be inefficient at killing this bacterium. Thus, the goal of this study was to improve the therapeutic potential of PP01 through short-term experimental evolution. Four replicate populations of PP01 were serially passaged 21 times on non-evolving E. coli O157:H7 with the prediction that the evolved phage populations would adsorb faster and more efficiently kill the host bacteria. Dead-cell adsorption assays and in vitro killing assays confirmed that evolved viruses improved their adsorption ability on E. coli O157:H7, and adapted to kill host bacteria faster than the wildtype ancestor. Sequencing of candidate tail-fiber genes revealed that the phage populations evolved in parallel; the lineages shared two point mutations in gp38 that encodes a host recognition protein, and surprisingly shared a ~600 bp deletion in gp37 that encodes the distal tail fibers. In contrast, no mutations were observed in the gp12 gene encoding PP01’s short tail fibers. We discuss the functional role of the observed mutations, including the possible adaptive role of the evolved deletions. This study demonstrates how experimental evolution can be used to select for viral traits that improve phage attack of an important bacterial pathogen, and that the molecular targets of selection include loci contributing to cell attachment and phage virulence.
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73
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Ayaz Ahmed KB, Raman T, Veerappan A. Jacalin capped platinum nanoparticles confer persistent immunity against multiple Aeromonas infection in zebrafish. Sci Rep 2018; 8:2200. [PMID: 29396408 PMCID: PMC5797147 DOI: 10.1038/s41598-018-20627-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2017] [Accepted: 01/16/2018] [Indexed: 12/17/2022] Open
Abstract
Bacterial resistance is a major clinical problem, which is compounded by both a lack of new antibiotics and emergence of multi- and extremely-drug resistant microbes. In this context, non-toxic nanoparticles could play an important role in conferring protection against bacterial infections and in this study we have made an attempt to show the usefulness of jacalin capped platinum nanoparticles in protecting zebrafish against multiple infections with Aeromonas hydrophila. Our results also indicate that use of nanoparticles promotes adaptive immune response against the pathogen, so much so that zebrafish is able to survive repetitive infection even after twenty one days of being treated with jacalin-capped platinum nanoparticles. This is significant given that platinum salt is not antibacterial and jacalin is non-immunogenic. Our study for the first time reveals a novel mechanism of action of nanoparticles, which could form an alternate antibacterial strategy with minimal bacterial resistance.
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Affiliation(s)
- Khan Behlol Ayaz Ahmed
- School of Chemical and Biotechnology, SASTRA University, Thirumalaisamudram, Thanjavur, 613401, Tamil Nadu, India
| | - Thiagarajan Raman
- School of Chemical and Biotechnology, SASTRA University, Thirumalaisamudram, Thanjavur, 613401, Tamil Nadu, India.
- Department of Advanced Zoology and Biotechnology, Ramakrishna Mission Vivekananda College, Mylapore, Chennai, 600004, India.
| | - Anbazhagan Veerappan
- School of Chemical and Biotechnology, SASTRA University, Thirumalaisamudram, Thanjavur, 613401, Tamil Nadu, India.
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74
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Inactivation of Staphylococcus aureus in visible light by morphology tuned α-NiMoO4. J Photochem Photobiol A Chem 2018. [DOI: 10.1016/j.jphotochem.2017.09.042] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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75
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Pérez-Peinado C, Dias SA, Domingues MM, Benfield AH, Freire JM, Rádis-Baptista G, Gaspar D, Castanho MARB, Craik DJ, Henriques ST, Veiga AS, Andreu D. Mechanisms of bacterial membrane permeabilization by crotalicidin (Ctn) and its fragment Ctn(15-34), antimicrobial peptides from rattlesnake venom. J Biol Chem 2017; 293:1536-1549. [PMID: 29255091 DOI: 10.1074/jbc.ra117.000125] [Citation(s) in RCA: 74] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2017] [Revised: 12/11/2017] [Indexed: 12/14/2022] Open
Abstract
Crotalicidin (Ctn), a cathelicidin-related peptide from the venom of a South American rattlesnake, possesses potent antimicrobial, antitumor, and antifungal properties. Previously, we have shown that its C-terminal fragment, Ctn(15-34), retains the antimicrobial and antitumor activities but is less toxic to healthy cells and has improved serum stability. Here, we investigated the mechanisms of action of Ctn and Ctn(15-34) against Gram-negative bacteria. Both peptides were bactericidal, killing ∼90% of Escherichia coli and Pseudomonas aeruginosa cells within 90-120 and 5-30 min, respectively. Studies of ζ potential at the bacterial cell membrane suggested that both peptides accumulate at and neutralize negative charges on the bacterial surface. Flow cytometry experiments confirmed that both peptides permeabilize the bacterial cell membrane but suggested slightly different mechanisms of action. Ctn(15-34) permeabilized the membrane immediately upon addition to the cells, whereas Ctn had a lag phase before inducing membrane damage and exhibited more complex cell-killing activity, probably because of two different modes of membrane permeabilization. Using surface plasmon resonance and leakage assays with model vesicles, we confirmed that Ctn(15-34) binds to and disrupts lipid membranes and also observed that Ctn(15-34) has a preference for vesicles that mimic bacterial or tumor cell membranes. Atomic force microscopy visualized the effect of these peptides on bacterial cells, and confocal microscopy confirmed their localization on the bacterial surface. Our studies shed light onto the antimicrobial mechanisms of Ctn and Ctn(15-34), suggesting Ctn(15-34) as a promising lead for development as an antibacterial/antitumor agent.
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Affiliation(s)
- Clara Pérez-Peinado
- From the Department of Experimental and Health Science, Universitat Pompeu Fabra, Barcelona Biomedical Research Park, 08003 Barcelona, Spain
| | - Susana Almeida Dias
- the Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, 1649-028 Lisboa, Portugal
| | - Marco M Domingues
- the Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, 1649-028 Lisboa, Portugal
| | - Aurélie H Benfield
- the Institute for Molecular Bioscience, University of Queensland, St Lucia, Queensland 4072, Australia
| | - João Miguel Freire
- the Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, 1649-028 Lisboa, Portugal.,the Department of Virology, Institut Pasteur, 75724 Paris, France, and
| | - Gandhi Rádis-Baptista
- From the Department of Experimental and Health Science, Universitat Pompeu Fabra, Barcelona Biomedical Research Park, 08003 Barcelona, Spain.,the Laboratory of Biochemistry and Biotechnology, Institute for Marine Science, Federal University of Ceará, 60165-081 Fortaleza, CE, Brazil
| | - Diana Gaspar
- the Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, 1649-028 Lisboa, Portugal
| | - Miguel A R B Castanho
- the Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, 1649-028 Lisboa, Portugal
| | - David J Craik
- the Institute for Molecular Bioscience, University of Queensland, St Lucia, Queensland 4072, Australia
| | - Sónia Troeira Henriques
- the Institute for Molecular Bioscience, University of Queensland, St Lucia, Queensland 4072, Australia,
| | - Ana Salomé Veiga
- the Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, 1649-028 Lisboa, Portugal,
| | - David Andreu
- From the Department of Experimental and Health Science, Universitat Pompeu Fabra, Barcelona Biomedical Research Park, 08003 Barcelona, Spain,
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Diallylthiosulfinate (Allicin), a Volatile Antimicrobial from Garlic (Allium sativum), Kills Human Lung Pathogenic Bacteria, Including MDR Strains, as a Vapor. Molecules 2017; 22:molecules22101711. [PMID: 29023413 PMCID: PMC6151386 DOI: 10.3390/molecules22101711] [Citation(s) in RCA: 72] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2017] [Accepted: 10/09/2017] [Indexed: 11/16/2022] Open
Abstract
Garlic (Allium sativum) has potent antimicrobial activity due to allicin (diallylthiosulfinate) synthesized by enzyme catalysis in damaged garlic tissues. Allicin gives crushed garlic its characteristic odor and its volatility makes it potentially useful for combating lung infections. Allicin was synthesized (>98% pure) by oxidation of diallyl disulfide by H₂O₂ using formic acid as a catalyst and the growth inhibitory effect of allicin vapor and allicin in solution to clinical isolates of lung pathogenic bacteria from the genera Pseudomonas, Streptococcus, and Staphylococcus, including multi-drug resistant (MDR) strains, was demonstrated. Minimal inhibitory (MIC) and minimal bactericidal concentrations (MBC) were determined and compared to clinical antibiotics using standard European Committee on Antimicrobial Susceptibility Testing (EUCAST) procedures. The cytotoxicity of allicin to human lung and colon epithelial and murine fibroblast cells was tested in vitro and shown to be ameliorated by glutathione (GSH). Similarly, the sensitivity of rat precision-cut lung slices (PCLS) to allicin was decreased by raising the [GSH] to the approximate blood plasma level of 1 mM. Because allicin inhibited bacterial growth as a vapor, it could be used to combat bacterial lung infections via direct inhalation. Since there are no volatile antibiotics available to treat pulmonary infections, allicin, particularly at sublethal doses in combination with oral antibiotics, could make a valuable addition to currently available treatments.
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Ray SK, Dhakal D, Pandey RP, Lee SW. Ag-BaMoO 4 : Er 3+ /Yb 3+ photocatalyst for antibacterial application. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2017; 78:1164-1171. [DOI: 10.1016/j.msec.2017.04.115] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2017] [Revised: 04/17/2017] [Accepted: 04/19/2017] [Indexed: 12/11/2022]
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Topological pattern for the search of new active drugs against methicillin resistant Staphylococcus aureus. Eur J Med Chem 2017; 138:807-815. [PMID: 28734246 DOI: 10.1016/j.ejmech.2017.07.010] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2017] [Revised: 06/13/2017] [Accepted: 07/06/2017] [Indexed: 11/22/2022]
Abstract
Molecular topology was used to develop a mathematical model capable of classifying compounds according to antimicrobial activity against methicillin resistant Staphylococcus aureus (MRSA). Topological indices were used as structural descriptors and their relation to antimicrobial activity was determined by using linear discriminant analysis. This topological model establishes new structure activity relationships which show that the presence of cyclopropyl, chlorine and ramification pairs at a distance of two bonds favor this activity, while the presence of tertiary amines decreases it. This model was applied to a combinatorial library of a thousand and one 6-fluoroquinolones, from which 117 theoretical active molecules were obtained. The compound 10 and five new quinolones were tested against MRSA. They all showed some activity against MRSA, although compounds 6, 8 and 9 showed anti-MRSA activity similar to ciprofloxacin. This model was also applied to 263 theoretical antibacterial agents described by us in a previous work, from which 34 were predicted as theoretically active. Anti-MRSA activity was found bibliographically in 9 of them (ensuring at least 26% of success), and from the rest, 3 compounds were randomly chosen and tested, finding mitomycin C to be more active than ciprofloxacin. The results demonstrate the utility of the molecular topology approaches for identifying new drugs active against MRSA.
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Abstract
Infectious diseases caused by pathogens and food poisoning caused by spoilage microorganisms are threatening human health all over the world. The efficacies of some antimicrobial agents, which are currently used to extend shelf-life and increase the safety of food products in food industry and to inhibit disease-causing microorganisms in medicine, have been weakened by microbial resistance. Therefore, new antimicrobial agents that could overcome this resistance need to be discovered. Many spices-such as clove, oregano, thyme, cinnamon, and cumin-possessed significant antibacterial and antifungal activities against food spoilage bacteria like Bacillus subtilis and Pseudomonas fluorescens, pathogens like Staphylococcus aureus and Vibrio parahaemolyticus, harmful fungi like Aspergillus flavus, even antibiotic resistant microorganisms such as methicillin resistant Staphylococcus aureus. Therefore, spices have a great potential to be developed as new and safe antimicrobial agents. This review summarizes scientific studies on the antibacterial and antifungal activities of several spices and their derivatives.
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80
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Grassi L, Maisetta G, Maccari G, Esin S, Batoni G. Analogs of the Frog-skin Antimicrobial Peptide Temporin 1Tb Exhibit a Wider Spectrum of Activity and a Stronger Antibiofilm Potential as Compared to the Parental Peptide. Front Chem 2017; 5:24. [PMID: 28443279 PMCID: PMC5387044 DOI: 10.3389/fchem.2017.00024] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2016] [Accepted: 03/23/2017] [Indexed: 11/13/2022] Open
Abstract
The frog skin-derived peptide Temporin 1Tb (TB) has gained increasing attention as novel antimicrobial agent for the treatment of antibiotic-resistant and/or biofilm-mediated infections. Nevertheless, such a peptide possesses a preferential spectrum of action against Gram-positive bacteria. In order to improve the therapeutic potential of TB, the present study evaluated the antibacterial and antibiofilm activities of two TB analogs against medically relevant bacterial species. Of the two analogs, TB_KKG6A has been previously described in the literature, while TB_L1FK is a new analog designed by us through statistical-based computational strategies. Both TB analogs displayed a faster and stronger bactericidal activity than the parental peptide, especially against Gram-negative bacteria in planktonic form. Differently from the parental peptide, TB_KKG6A and TB_L1FK were able to inhibit the formation of Staphylococcus aureus biofilms by more than 50% at 12 μM, while only TB_KKG6A prevented the formation of Pseudomonas aeruginosa biofilms at 24 μM. A marked antibiofilm activity against preformed biofilms of both bacterial species was observed for the two TB analogs when used in combination with EDTA. Analysis of synergism at the cellular level suggested that the antibiofilm activity exerted by the peptide-EDTA combinations against mature biofilms might be due mainly to a disaggregating effect on the extracellular matrix in the case of S. aureus, and to a direct activity on biofilm-embedded cells in the case of P. aeruginosa. Both analogs displayed a low hemolytic effect at the active concentrations and, overall, TB_L1FK resulted less cytotoxic toward mammalian cells. Collectively, the results obtained demonstrated that subtle changes in the primary sequence of TB may provide TB analogs that, used alone or in combination with adjuvant molecules such as EDTA, exhibit promising features against both planktonic and biofilm cells of medically relevant bacteria.
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Affiliation(s)
- Lucia Grassi
- Department of Translational Research and new Technologies in Medicine and Surgery, University of PisaPisa, Italy
| | - Giuseppantonio Maisetta
- Department of Translational Research and new Technologies in Medicine and Surgery, University of PisaPisa, Italy
| | - Giuseppe Maccari
- Center for Nanotechnology Innovation @NEST, Italian Institute of TechnologyPisa, Italy
| | - Semih Esin
- Department of Translational Research and new Technologies in Medicine and Surgery, University of PisaPisa, Italy
| | - Giovanna Batoni
- Department of Translational Research and new Technologies in Medicine and Surgery, University of PisaPisa, Italy
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81
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Casadevall A. Crisis in Infectious Diseases: 2 Decades Later. Clin Infect Dis 2017; 64:823-828. [PMID: 28362950 PMCID: PMC5849092 DOI: 10.1093/cid/cix067] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2017] [Accepted: 02/22/2017] [Indexed: 12/13/2022] Open
Affiliation(s)
- Arturo Casadevall
- Department of Molecular Microbiology and Immunology and Department of Medicine, Division of Infectious Diseases, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland
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82
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An Efficient Synthesis of Novel Bioactive Thiazolyl-Phthalazinediones under Ultrasound Irradiation. Molecules 2017; 22:molecules22020319. [PMID: 28218718 PMCID: PMC6155881 DOI: 10.3390/molecules22020319] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2016] [Revised: 01/16/2017] [Accepted: 02/14/2017] [Indexed: 12/05/2022] Open
Abstract
Novel 2-thiazolylphthalazine derivatives were efficiently synthesized under ultrasound irradiation, resulting in high yields and short reaction times after optimization of the reaction conditions. All prepared compounds were fully characterized using spectroscopic methods. They were screened for their antimicrobial activity against Gram-positive and Gram-negative bacteria as well as for antifungal activity. The antimicrobial activity profile of the tested compounds showed some promising results. The potent activity of compounds 4d, 7b (117% zone inhibition) and 7c (105% zone inhibition) against Salmonella sp., exceeding that of the reference drug Gentamycin is particularly noteworthy. In general, the newly synthesized thiazolylphthalazine derivatives showed higher antimicrobial activity against the tested Gram-negative bacteria than against Gram-positive bacteria and fungi.
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83
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Malhadas C, Malheiro R, Pereira JA, de Pinho PG, Baptista P. Antimicrobial activity of endophytic fungi from olive tree leaves. World J Microbiol Biotechnol 2017; 33:46. [PMID: 28168624 DOI: 10.1007/s11274-017-2216-7] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2016] [Accepted: 01/18/2017] [Indexed: 12/14/2022]
Abstract
In this study, the antimicrobial potential of three fungal endophytes from leaves of Olea europaea L. was evaluated and the host plant extract effect in the antimicrobial activity was examined. The volatile compounds produced by endophytes were identified by GC/MS and further correlated with the antimicrobial activity. In potato dextrose agar, both Penicillium commune and Penicillium canescens were the most effective inhibiting Gram-positive and -negative bacteria (up to 2.7-fold compared to 30 µg/mL chloramphenicol), whereas Alternaria alternata was most effective inhibiting yeasts (up to 8.0-fold compared to 25 μg/mL fluconazole). The presence of aqueous leaf extract in culture medium showed to induce or repress the antimicrobial activity, depending on the endophytic species. In the next step, various organic extracts from both A. alternata mycelium and cultured broth were prepared; being ethyl acetate extracts displayed the widest spectrum of anti-microorganisms at a minimum inhibitory concentration ≤0.095 mg/mL. The volatile composition of the fungi that displayed the highest (A. alternata) and the lowest (P. canescens) antimicrobial activity against yeasts revealed the presence of six volatiles, being the most abundant components (3-methyl-1-butanol and phenylethyl alcohol) ascribed with antimicrobial potentialities. Overall the results highlighted for the first time the antimicrobial potential of endophytic fungi from O. europaea and the possibility to be exploited for their antimicrobial agents.
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Affiliation(s)
- Cynthia Malhadas
- REQUIMTE-LAQV, School of Agriculture, Polytechnic Institute of Bragança, Campus de Santa Apolónia, 5300-253, Bragança, Portugal
| | - Ricardo Malheiro
- REQUIMTE-LAQV, School of Agriculture, Polytechnic Institute of Bragança, Campus de Santa Apolónia, 5300-253, Bragança, Portugal
| | - José Alberto Pereira
- REQUIMTE-LAQV, School of Agriculture, Polytechnic Institute of Bragança, Campus de Santa Apolónia, 5300-253, Bragança, Portugal
| | - Paula Guedes de Pinho
- REQUIMTE/Laboratory of Toxicology, Faculty of Pharmacy, Porto University, Rua Jorge Viterbo Ferreira 228, 4050-313, Porto, Portugal
| | - Paula Baptista
- REQUIMTE-LAQV, School of Agriculture, Polytechnic Institute of Bragança, Campus de Santa Apolónia, 5300-253, Bragança, Portugal.
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84
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Disorazoles Block Group A Streptococcal Invasion into Epithelial Cells Via Interference with the Host Factor Ezrin. Cell Chem Biol 2017; 24:159-170. [DOI: 10.1016/j.chembiol.2016.12.011] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2016] [Revised: 11/07/2016] [Accepted: 12/15/2016] [Indexed: 12/22/2022]
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85
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Ruiz-González R, Setaro F, Gulías Ò, Agut M, Hahn U, Torres T, Nonell S. Cationic phthalocyanine dendrimers as potential antimicrobial photosensitisers. Org Biomol Chem 2017; 15:9008-9017. [DOI: 10.1039/c7ob02270k] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Synthesis, photophysical properties and photoantimicrobial efficiency of cationic Zn(ii) and Ru(ii) dendrimeric phthalocyanines.
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Affiliation(s)
| | - Francesca Setaro
- Departamento de Química Orgánica
- Universidad Autónoma de Madrid
- 28049 Madrid
- Spain
| | - Òscar Gulías
- Institut Químic de Sarriá
- Universitat Ramon Llull
- Barcelona
- Spain
| | - Montserrat Agut
- Institut Químic de Sarriá
- Universitat Ramon Llull
- Barcelona
- Spain
| | - Uwe Hahn
- Departamento de Química Orgánica
- Universidad Autónoma de Madrid
- 28049 Madrid
- Spain
- Laboratoire de Chimie des Matériaux Moléculaires
| | - Tomás Torres
- Departamento de Química Orgánica
- Universidad Autónoma de Madrid
- 28049 Madrid
- Spain
- IMDEA-Nanociencia
| | - Santi Nonell
- Institut Químic de Sarriá
- Universitat Ramon Llull
- Barcelona
- Spain
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86
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Kamal AAM, Maurer CK, Allegretta G, Haupenthal J, Empting M, Hartmann RW. Quorum Sensing Inhibitors as Pathoblockers for Pseudomonas aeruginosa Infections: A New Concept in Anti-Infective Drug Discovery. TOPICS IN MEDICINAL CHEMISTRY 2017. [DOI: 10.1007/7355_2017_17] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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87
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Versluis D, Rodriguez de Evgrafov M, Sommer MOA, Sipkema D, Smidt H, van Passel MWJ. Sponge Microbiota Are a Reservoir of Functional Antibiotic Resistance Genes. Front Microbiol 2016; 7:1848. [PMID: 27909433 PMCID: PMC5112248 DOI: 10.3389/fmicb.2016.01848] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2016] [Accepted: 11/03/2016] [Indexed: 11/16/2022] Open
Abstract
Wide application of antibiotics has contributed to the evolution of multi-drug resistant human pathogens, resulting in poorer treatment outcomes for infections. In the marine environment, seawater samples have been investigated as a resistance reservoir; however, no studies have methodically examined sponges as a reservoir of antibiotic resistance. Sponges could be important in this respect because they often contain diverse microbial communities that have the capacity to produce bioactive metabolites. Here, we applied functional metagenomics to study the presence and diversity of functional resistance genes in the sponges Aplysina aerophoba, Petrosia ficiformis, and Corticium candelabrum. We obtained 37 insert sequences facilitating resistance to D-cycloserine (n = 6), gentamicin (n = 1), amikacin (n = 7), trimethoprim (n = 17), chloramphenicol (n = 1), rifampicin (n = 2) and ampicillin (n = 3). Fifteen of 37 inserts harbored resistance genes that shared <90% amino acid identity with known gene products, whereas on 13 inserts no resistance gene could be identified with high confidence, in which case we predicted resistance to be mainly mediated by antibiotic efflux. One marine-specific ampicillin-resistance-conferring β-lactamase was identified in the genus Pseudovibrio with 41% global amino acid identity to the closest β-lactamase with demonstrated functionality, and subsequently classified into a new family termed PSV. Taken together, our results show that sponge microbiota host diverse and novel resistance genes that may be harnessed by phylogenetically distinct bacteria.
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Affiliation(s)
- Dennis Versluis
- Laboratory of Microbiology, Wageningen University Wageningen, Netherlands
| | | | - Morten O A Sommer
- Novo Nordisk Foundation Center for Biosustainability, Technical University of Denmark Hørsholm, Denmark
| | - Detmer Sipkema
- Laboratory of Microbiology, Wageningen University Wageningen, Netherlands
| | - Hauke Smidt
- Laboratory of Microbiology, Wageningen University Wageningen, Netherlands
| | - Mark W J van Passel
- Laboratory of Microbiology, Wageningen UniversityWageningen, Netherlands; National Institute for Public Health and the EnvironmentBilthoven, Netherlands
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88
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Stein RA. Colistin: revival in times of hardship. Int J Clin Pract 2016; 70:703-5. [PMID: 27600861 DOI: 10.1111/ijcp.12862] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Affiliation(s)
- Richard A Stein
- Department of Biochemistry and Molecular Pharmacology, New York University School of Medicine, New York, NY, USA
- Department of Natural Sciences, LaGuardia Community College, City University of New York, New York, NY, USA
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89
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Soldati R, Cervellati R, Martelli G, Greco E, Demma A, Giacomini D. Unprotected Polyphenols in Substitution Reactions with 4-Acetoxy-azetidinones. ChemistrySelect 2016. [DOI: 10.1002/slct.201600669] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Roberto Soldati
- Department of Chemistry “G. Ciamician”; University of Bologna; Via Selmi, 2 40126 Bologna - Italy
| | - Rinaldo Cervellati
- Department of Chemistry “G. Ciamician”; University of Bologna; Via Selmi, 2 40126 Bologna - Italy
| | - Giulia Martelli
- Department of Chemistry “G. Ciamician”; University of Bologna; Via Selmi, 2 40126 Bologna - Italy
| | - Emanuela Greco
- Department of Chemistry “G. Ciamician”; University of Bologna; Via Selmi, 2 40126 Bologna - Italy
| | - Anna Demma
- Department of Chemistry “G. Ciamician”; University of Bologna; Via Selmi, 2 40126 Bologna - Italy
| | - Daria Giacomini
- Department of Chemistry “G. Ciamician”; University of Bologna; Via Selmi, 2 40126 Bologna - Italy
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90
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Khan R, Baeshen MN, Saini KS, Bora RS, Al-Hejin AM, Baeshen NA. Antibacterial activities of Rhazya stricta leaf extracts against multidrug-resistant human pathogens. BIOTECHNOL BIOTEC EQ 2016. [DOI: 10.1080/13102818.2016.1209087] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
Affiliation(s)
- Raziuddin Khan
- Faculty of Sciences, Department of Biology, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Mohammed N. Baeshen
- Faculty of Sciences, Department of Biology, University of Jeddah, Saudi Arabia
- Center of Nanotechnology, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Kulvinder S. Saini
- Faculty of Sciences, Department of Biology, King Abdulaziz University, Jeddah, Saudi Arabia
- School of Biotechnology, Eternal University, Baru Sahib, India
| | - Roop S. Bora
- Faculty of Sciences, Department of Biology, King Abdulaziz University, Jeddah, Saudi Arabia
- School of Biotechnology, Eternal University, Baru Sahib, India
| | - Ahmed M. Al-Hejin
- Faculty of Sciences, Department of Biology, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Nabih A. Baeshen
- Faculty of Sciences, Department of Biology, King Abdulaziz University, Jeddah, Saudi Arabia
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91
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An expeditious four-component domino protocol for the synthesis of novel thiazolo[3,2-a]thiochromeno[4,3-d]pyrimidine derivatives as antibacterial and antibiofilm agents. Bioorg Med Chem 2016; 24:3808-17. [PMID: 27344213 DOI: 10.1016/j.bmc.2016.06.025] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Revised: 06/10/2016] [Accepted: 06/11/2016] [Indexed: 12/13/2022]
Abstract
An efficient domino protocol has been developed for the synthesis of new pyrimidine scaffolds, through a one-pot four-component cascade transformation via [Bmim]HSO4 ionic liquid mediated reaction, using an equimolar mixture of thiochroman-4-one, benzaldehyde, thiourea and 3-bromo-1-phenylpropan-1-one leading to the formation of a double electrophilic pyrimidine-2(5H)-thione intermediate. The intermediate regioselectively undergoes cyclization through intramolecular NH bond activation followed by CS bond formation leading to highly functionalized thiazolo[3,2-a]thiochromeno[4,3-d]pyrimidines. The ionic liquid operates efficiently under mild conditions. The recyclability and scope for recovery of the ionic liquid makes this protocol environmentally benign. Further, the compounds 5d, 5g and 5k showed promising antimicrobial activity against the tested Gram-positive bacterial strains. Among them, the compound 5d was identified as a lead molecule exhibiting promising anti-biofilm activity towards Staphylococcus aureus MTCC 96, Bacillus subtilis MTCC 121, Staphylococcus aureus MLS16 MTCC 2940 and Micrococcus luteus MTCC 2470 with IC50 values of 2.1, 1.9, 2.4 and 5.3μg/mL, respectively. Further, the compound 5d showed increased levels of intracellular ROS accumulation in Staphylococcus aureus MTCC 96 suggesting that oxidative stress resulted in bacterial cell lysis and death.
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92
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Marchese A, Barbieri R, Sanches-Silva A, Daglia M, Nabavi SF, Jafari NJ, Izadi M, Ajami M, Nabavi SM. Antifungal and antibacterial activities of allicin: A review. Trends Food Sci Technol 2016. [DOI: 10.1016/j.tifs.2016.03.010] [Citation(s) in RCA: 87] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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93
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Antimicrobial Susceptibility of Escherichia coli Strains Isolated from Alouatta spp. Feces to Essential Oils. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2016; 2016:1643762. [PMID: 27313638 PMCID: PMC4904082 DOI: 10.1155/2016/1643762] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 03/28/2016] [Accepted: 05/09/2016] [Indexed: 11/18/2022]
Abstract
This study evaluated the in vitro antibacterial activity of essential oils from Lippia graveolens (Mexican oregano), Origanum vulgaris (oregano), Thymus vulgaris (thyme), Rosmarinus officinalis (rosemary), Cymbopogon nardus (citronella), Cymbopogon citratus (lemongrass), and Eucalyptus citriodora (eucalyptus) against Escherichia coli (n = 22) strains isolated from Alouatta spp. feces. Minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) were determined for each isolate using the broth microdilution technique. Essential oils of Mexican oregano (MIC mean = 1818 μg mL−1; MBC mean = 2618 μg mL−1), thyme (MIC mean = 2618 μg mL−1; MBC mean = 2909 μg mL−1), and oregano (MIC mean = 3418 μg mL−1; MBC mean = 4800 μg mL−1) showed the best antibacterial activity, while essential oils of eucalyptus, rosemary, citronella, and lemongrass displayed no antibacterial activity at concentrations greater than or equal to 6400 μg mL−1. Our results confirm the antimicrobial potential of some essential oils, which deserve further research.
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94
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Zheng Z, Xu Q, Guo J, Qin J, Mao H, Wang B, Yan F. Structure-Antibacterial Activity Relationships of Imidazolium-Type Ionic Liquid Monomers, Poly(ionic liquids) and Poly(ionic liquid) Membranes: Effect of Alkyl Chain Length and Cations. ACS APPLIED MATERIALS & INTERFACES 2016; 8:12684-12692. [PMID: 27145107 DOI: 10.1021/acsami.6b03391] [Citation(s) in RCA: 171] [Impact Index Per Article: 21.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The structure-antibacterial activity relationship between the small molecular compounds and polymers are still elusive. Here, imidazolium-type ionic liquid (IL) monomers and their corresponding poly(ionic liquids) (PILs) and poly(ionic liquid) membranes were synthesized. The effect of chemical structure, including carbon chain length of substitution at the N3 position and charge density of cations (mono- or bis-imidazolium) on the antimicrobial activities against both Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) was investigated by determination of minimum inhibitory concentration (MIC). The antibacterial activities of both ILs and PILs were improved with the increase of the alkyl chain length and higher charge density (bis-cations) of imidazolium cations. Moreover, PILs exhibited lower MIC values relative to the IL monomers. However, the antibacterial activities of PIL membranes showed no correlation to those of their analogous small molecule IL monomers and PILs, which increased with the charge density (bis-cations) while decreasing with the increase of alkyl chain length. The results indicated that antibacterial property studies on small molecules and homopolymers may not provide a solid basis for evaluating that in corresponding polymer membranes.
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Affiliation(s)
- Zhiqiang Zheng
- Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, Department of Polymer Science and Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University , Suzhou 215123, China
| | - Qiming Xu
- Department of Anesthesiology and Critical Care Medicine, Zhongshan Hospital, Fudan University , Shanghai 200438, China
| | - Jiangna Guo
- Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, Department of Polymer Science and Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University , Suzhou 215123, China
| | - Jing Qin
- Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, Department of Polymer Science and Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University , Suzhou 215123, China
| | - Hailei Mao
- Department of Anesthesiology and Critical Care Medicine, Zhongshan Hospital, Fudan University , Shanghai 200438, China
| | - Bin Wang
- Department of Plastic and Reconstructive Surgery, Shanghai Ninth People's Hospital, Shanghai Jiaotong University School of Medicine , Shanghai 200025, China
| | - Feng Yan
- Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, Department of Polymer Science and Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University , Suzhou 215123, China
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95
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Branched Peptide, B2088, Disrupts the Supramolecular Organization of Lipopolysaccharides and Sensitizes the Gram-negative Bacteria. Sci Rep 2016; 6:25905. [PMID: 27174567 PMCID: PMC4865820 DOI: 10.1038/srep25905] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2015] [Accepted: 04/25/2016] [Indexed: 12/30/2022] Open
Abstract
Dissecting the complexities of branched peptide-lipopolysaccharides (LPS) interactions provide rationale for the development of non-cytotoxic antibiotic adjuvants. Using various biophysical methods, we show that the branched peptide, B2088, binds to lipid A and disrupts the supramolecular organization of LPS. The disruption of outer membrane in an intact bacterium was demonstrated by fluorescence spectroscopy and checkerboard assays, the latter confirming strong to moderate synergism between B2088 and various classes of antibiotics. The potency of synergistic combinations of B2088 and antibiotics was further established by time-kill kinetics, mammalian cell culture infections model and in vivo model of bacterial keratitis. Importantly, B2088 did not show any cytotoxicity to corneal epithelial cells for at least 96 h continuous exposure or hemolytic activity even at 20 mg/ml. Peptide congeners containing norvaline, phenylalanine and tyrosine (instead of valine in B2088) displayed better synergism compared to other substitutions. We propose that high affinity and subsequent disruption of the supramolecular assembly of LPS by the branched peptides are vital for the development of non-cytotoxic antibiotic adjuvants that can enhance the accessibility of conventional antibiotics to the intracellular targets, decrease the antibiotic consumption and holds promise in averting antibiotic resistance.
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96
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Vries RD, Andrade CAS, Bakuzis AF, Mandal SM, Franco OL. Next-generation nanoantibacterial tools developed from peptides. Nanomedicine (Lond) 2016; 10:1643-61. [PMID: 26008197 DOI: 10.2217/nnm.15.9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Bacteria resistant against various antimicrobial compounds have emerged in many countries, and the age of resistance has just started. Among the more promising novel antimicrobial compounds on which current research is focusing are the antimicrobial peptides (AMPs). These are often less susceptible to bacterial resistance since multiple modifications in the cellular membranes, cell wall and metabolism are required to reduce their effectiveness. Most likely, the use of pure AMPs will be insufficient for controlling pathogenic bacteria, and innovative approaches are required to employ AMPs in new antibiotic treatments. Therefore, here we review novel bionanotechnological approaches, including nanofibers, nanoparticles and magnetic particles for effectively using AMPs in fighting infectious diseases.
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Affiliation(s)
- Renko de Vries
- 2Department of Biomedical Engineering, University Medical Center Groningen, University of Groningen, PO Box 196, 9700 AD Groningen, The Netherlands
| | - Cesar A S Andrade
- 3Departamento de Bioquímica e Programa de Pós-Graduação em Inovação Terapêutica, Universidade Federal de Pernambuco, 50670-901 Recife, PE, Brazil
| | - Andris F Bakuzis
- 4Instituto de Física, Universidade Federal de Goiás, 74001-970, Goiânia, GO, Brazil
| | - Santi M Mandal
- 5Anti-Infective Research Lab, Department of Microbiology, Vidyasagar University, Midnapore 721102, West Bengal, Índia
| | - Octavio L Franco
- 6Centro de Análises, Proteômicas e Bioquímicas, Programa de Pós-Graduação em Ciências Genômicas e Biotecnologia, Universidade Católica de Brasília, 70790-160, Brazil.,7S-Inova, Pós-Graduação em Biotecnologia, Universidade Católica Dom Bosco, Campo Grande, MS, Brazil
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97
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van Hout J, Heuvelink A, Gonggrijp M. Monitoring of antimicrobial susceptibility of Streptococcus suis in the Netherlands, 2013-2015. Vet Microbiol 2016; 194:5-10. [PMID: 27131836 DOI: 10.1016/j.vetmic.2016.03.014] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2015] [Revised: 03/23/2016] [Accepted: 03/25/2016] [Indexed: 12/14/2022]
Abstract
The objective of the present study was to analyse the in vitro antimicrobial susceptibility of Streptococcus suis isolates from post-mortem samples from pigs in the Netherlands. S. suis isolates originated from diagnostic submissions of pigs sent to the Pathology Department of GD Animal Health, from April 2013 till June 2015. Minimal inhibitory concentrations (MICs) of in total 15 antimicrobials were assessed by broth microdilution following CLSI recommendations. MIC50 and MIC90 values were determined and MICs were interpreted as susceptible, intermediate and resistant using CLSI veterinary breakpoints (when available). Emergence of resistance among S. suis (n=1163) derived from clinical submissions of pigs appeared to be limited. Resistance to ampicillin, ceftiofur, clindamycin, enrofloxacin, florfenicol, penicillin, trimethoprim/sulfamethoxazole and tetracycline was 0.3%, 0.5%, 48.1%, 0.6%, 0.1%, 0.5%, 3.0%, and 78.4%, respectively. Cross-resistance between penicillin and ampicillin appeared to be incomplete. MIC values of erythromycin, clindamycin, neomycin, penicillin and tilmicosin for isolates originating from grower/finisher pigs were significantly more often lower than the MIC values of isolates from suckling/weaned piglets. It has to be kept in mind that these results represent only part of the Dutch pig population and it can be discussed whether this is a representative sample. Interpretation of the MIC results of (clinically relevant) antimicrobials tested for treatment of S. suis infection is strongly hampered by the lack of CLSI-defined veterinary clinical breakpoints that are animal species- and body site-specific. Therefore, and to conduct a clinically reliable monitoring of antimicrobial susceptibility of veterinary pathogens, more species- and organ-specific veterinary breakpoints are urgently needed.
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Affiliation(s)
- Jobke van Hout
- GD Animal Health, Arnsbergstraat 7, 7418 EZ, Deventer, the Netherlands.
| | - Annet Heuvelink
- GD Animal Health, Arnsbergstraat 7, 7418 EZ, Deventer, the Netherlands
| | - Maaike Gonggrijp
- GD Animal Health, Arnsbergstraat 7, 7418 EZ, Deventer, the Netherlands
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98
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Mohanram H, Bhattacharjya S. 'Lollipop'-shaped helical structure of a hybrid antimicrobial peptide of temporin B-lipopolysaccharide binding motif and mapping cationic residues in antibacterial activity. Biochim Biophys Acta Gen Subj 2016; 1860:1362-72. [PMID: 27015761 DOI: 10.1016/j.bbagen.2016.03.025] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2015] [Revised: 03/08/2016] [Accepted: 03/20/2016] [Indexed: 12/17/2022]
Abstract
BACKGROUND Temporins are attractive templates for the development of antibiotics. However, many temporins are inactive against Gram-negative bacteria. Previously, we demonstrated conjugation of a lipopolysaccharide binding motif peptide to temporins yielded hybrid non-haemolytic AMPs that killed several Gram-negative bacteria. METHODS We carried out a systematic Ala replacement of individual cationic and polar amino acid residues of LG21, a hybrid AMP consisted of temporin B (TB) and LPS binding motif. These Ala containing analogs of LG21 were examined for antibacterial activity, cell membrane permeabilization and liposome leakage assays using optical spectroscopic methods. Atomic resolution structure of LG21 was determined in zwitterionic dodecyl phosphocholine (DPC) micelles by NMR spectroscopy. RESULTS Cationic residues in the LPS binding motif of LG21 were critical for bactericidal and membrane permeabilization. Detergent bound structure of LG21 revealed helical conformation containing extensive sidechain/sidechain packing including cation/π interactions in the LPS binding motif. The helical structure of LG21 resembled a 'lollipop' like shape that was sustained by a compacted bulky aromatic/cationic head with a comparatively thinner 'stick' at the N-terminal region. The 'head' of the structure could be localized into micelle-water interfacial region whereas the 'stick' region may be inserted into the hydrophobic core of micelle. CONCLUSIONS The LPS binding motif of LG21 played dominant roles in broad spectrum activity and the 3-D structure provided plausible mechanistic insights for permeabilization of bacterial membrane. GENERAL SIGNIFICANCE Hybrid AMPs containing LPS binding motif could be useful for the structure based development of broad spectrum antibiotics.
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Affiliation(s)
- Harini Mohanram
- School of Biological Sciences, Nanyang Technological University, 60 Nanyang Drive, Singapore 637551, Singapore
| | - Surajit Bhattacharjya
- School of Biological Sciences, Nanyang Technological University, 60 Nanyang Drive, Singapore 637551, Singapore.
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99
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Zeng LW, Zhou CX, Liu JD, Liu CH, Mo JX, Hou AF, Yao W, Wang ZZ, Gan LS. Design, synthesis, and antimicrobial activities of new tanshinone IIA esters. Nat Prod Res 2016; 30:2662-2668. [DOI: 10.1080/14786419.2016.1138302] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Lin-Wei Zeng
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, P.R. China
| | - Chang-Xin Zhou
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, P.R. China
| | - Jia-Dong Liu
- State Key Lab of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing, P.R. China
| | - Chang-Hong Liu
- State Key Lab of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing, P.R. China
| | - Jian-Xia Mo
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, P.R. China
| | - A-Fang Hou
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, P.R. China
| | - Wei Yao
- Zhejiang Chemical Industry Research Institute Co. Ltd, Hangzhou, P.R. China
| | - Zhen-Zhen Wang
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, P.R. China
| | - Li-She Gan
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, P.R. China
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100
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Barriers and facilitators of evidence-based management of patients with bacterial infections among general dental practitioners: a theory-informed interview study. Implement Sci 2016; 11:11. [PMID: 26821790 PMCID: PMC4731984 DOI: 10.1186/s13012-016-0372-z] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2015] [Accepted: 01/12/2016] [Indexed: 01/21/2023] Open
Abstract
Background General dental practitioners (GDPs) regularly prescribe antibiotics to manage dental infections although most infections can be treated successfully by local measures. Published guidance to support GDPs to make appropriate prescribing decisions exists but there continues to be wide variation in dental antibiotic prescribing. An interview study was conducted as part of the Reducing Antibiotic Prescribing in Dentistry (RAPiD) trial to understand the barriers and facilitators of using local measures instead of prescribing antibiotics to manage bacterial infections. Methods Thirty semi-structured one-to-one telephone interviews were conducted using the Theoretical Domains Framework (TDF). Responses were coded into domains of the TDF and sub-themes. Priority domains (high frequency: ≥50 % interviewees discussed) relevant to behaviour change were identified as targets for future intervention efforts and mapped onto ‘intervention functions’ of the Behaviour Change Wheel system. Results Five domains (behavioural regulation, social influences, reinforcement, environmental context and resources, and beliefs about consequences) with seven sub-themes were identified as targets for future intervention. All participants had knowledge about the evidence-based management of bacterial infections, but they reported difficulties in following this due to patient factors and time management. Lack of time was found to significantly influence their decision processes with regard to performing local measures. Beliefs about their capabilities to overcome patient influence, beliefs that performing local measures would impact on subsequent appointment times as well as there being no incentives for performing local measures were also featured. Though no knowledge or basic skills issues were identified, the participants suggested some continuous professional development programmes (e.g. time management, an overview of published guidance) to address some of the barriers. The domain results suggest a number of intervention functions through which future interventions could change GDPs’ antibiotic prescribing for bacterial infections: imparting skills through training, providing an example for GDPs to imitate (i.e. modelling) or creating the expectation of a reward (i.e. incentivisation). Conclusions This is the first theoretically informed study to identify barriers and facilitators of evidence-based management of patients with bacterial infections among GDPs. A pragmatic approach is needed to address the modifiable barriers in future interventions intended to change dentists’ inappropriate prescribing behaviour. Electronic supplementary material The online version of this article (doi:10.1186/s13012-016-0372-z) contains supplementary material, which is available to authorized users.
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