201
|
|
202
|
Sleegers N, van Nuijs AL, van den Berg M, De Wael K. Cephalosporin Antibiotics: Electrochemical Fingerprints and Core Structure Reactions Investigated by LC–MS/MS. Anal Chem 2019; 91:2035-2041. [DOI: 10.1021/acs.analchem.8b04487] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Nick Sleegers
- Chemistry Department, AXES Research Group, Groenenborgerlaan 171, 2020 Antwerp, Belgium
| | - Alexander L.N. van Nuijs
- Department of Pharmaceutical Sciences, Toxicological Centre, Universiteitsplein 1, 2610 Wilrijk, Belgium
| | | | - Karolien De Wael
- Chemistry Department, AXES Research Group, Groenenborgerlaan 171, 2020 Antwerp, Belgium
| |
Collapse
|
203
|
Buijs Y, Bech PK, Vazquez-Albacete D, Bentzon-Tilia M, Sonnenschein EC, Gram L, Zhang SD. Marine Proteobacteria as a source of natural products: advances in molecular tools and strategies. Nat Prod Rep 2019; 36:1333-1350. [DOI: 10.1039/c9np00020h] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
This review covers the recent advances in molecular tools and strategies for studies and use of natural products from marine Proteobacteria.
Collapse
Affiliation(s)
- Yannick Buijs
- Department of Biotechnology and Biomedicine
- Technical University of Denmark
- DK-2800 Kgs Lyngby
- Denmark
| | - Pernille Kjersgaard Bech
- Department of Biotechnology and Biomedicine
- Technical University of Denmark
- DK-2800 Kgs Lyngby
- Denmark
| | - Dario Vazquez-Albacete
- Department of Biotechnology and Biomedicine
- Technical University of Denmark
- DK-2800 Kgs Lyngby
- Denmark
| | - Mikkel Bentzon-Tilia
- Department of Biotechnology and Biomedicine
- Technical University of Denmark
- DK-2800 Kgs Lyngby
- Denmark
| | - Eva C. Sonnenschein
- Department of Biotechnology and Biomedicine
- Technical University of Denmark
- DK-2800 Kgs Lyngby
- Denmark
| | - Lone Gram
- Department of Biotechnology and Biomedicine
- Technical University of Denmark
- DK-2800 Kgs Lyngby
- Denmark
| | - Sheng-Da Zhang
- Department of Biotechnology and Biomedicine
- Technical University of Denmark
- DK-2800 Kgs Lyngby
- Denmark
| |
Collapse
|
204
|
Zoccarato L, Grossart HP. Relationship Between Lifestyle and Structure of Bacterial Communities and Their Functionality in Aquatic Systems. ADVANCES IN ENVIRONMENTAL MICROBIOLOGY 2019. [DOI: 10.1007/978-3-030-16775-2_2] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
|
205
|
Maugeri G, Lychko I, Sobral R, Roque ACA. Identification and Antibiotic-Susceptibility Profiling of Infectious Bacterial Agents: A Review of Current and Future Trends. Biotechnol J 2019; 14:e1700750. [PMID: 30024110 PMCID: PMC6330097 DOI: 10.1002/biot.201700750] [Citation(s) in RCA: 89] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2018] [Revised: 07/06/2018] [Indexed: 12/16/2022]
Abstract
Antimicrobial resistance is one of the most worrying threats to humankind with extremely high healthcare costs associated. The current technologies used in clinical microbiology to identify the bacterial agent and profile antimicrobial susceptibility are time-consuming and frequently expensive. As a result, physicians prescribe empirical antimicrobial therapies. This scenario is often the cause of therapeutic failures, causing higher mortality rates and healthcare costs, as well as the emergence and spread of antibiotic resistant bacteria. As such, new technologies for rapid identification of the pathogen and antimicrobial susceptibility testing are needed. This review summarizes the current technologies, and the promising emerging and future alternatives for the identification and profiling of antimicrobial resistance bacterial agents, which are expected to revolutionize the field of clinical diagnostics.
Collapse
Affiliation(s)
- Gaetano Maugeri
- UCIBIO, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa, 2819-516, Caparica, Portugal
| | - Iana Lychko
- UCIBIO, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa, 2819-516, Caparica, Portugal
| | - Rita Sobral
- UCIBIO, Departamento de Ciências da Vida, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa, 2819-516, Caparica, Portugal
| | - Ana C A Roque
- UCIBIO, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa, 2819-516, Caparica, Portugal
| |
Collapse
|
206
|
Olaniran EI, Sogbanmu TO, Saliu JK. Biomonitoring, physico-chemical, and biomarker evaluations of abattoir effluent discharges into the Ogun River from Kara Market, Ogun State, Nigeria, using Clarias gariepinus. ENVIRONMENTAL MONITORING AND ASSESSMENT 2018; 191:44. [PMID: 30593602 DOI: 10.1007/s10661-018-7168-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2018] [Accepted: 12/17/2018] [Indexed: 06/09/2023]
Abstract
The discharge of untreated effluents into aquatic ecosystems poses potential adverse effects to aquatic organisms. In this study, the physico-chemical characteristics of abattoir effluent from Kara Cow Market, Ogun State, Nigeria, surface water and sediments from the Ogun River were evaluated. Fish species and macrobenthic fauna diversity in the river were also examined. Acute toxicity and biochemical and histological studies were investigated in Clarias gariepinus exposed to sub-lethal concentrations of the effluent over a period of 28 days. Effluent physico-chemical parameters such as ammonia, conductivity, total dissolved solids, and total suspended solids were higher than set limits. Total polycyclic aromatic hydrocarbons (PAHs) in the effluent and sediment were 6.73 mg/L and 8.07 mg/kg, respectively. Tetracycline (an antibiotic administered to the cows at the market) levels in the effluent and surface water were 0.23 μg/mL and 0.85 μg/mL, respectively. Fish species diversity was lower at the test site compared to the reference site. Chironomus spp. and Tubifex tubifex dominated the benthic assemblage at the test site. There were significant changes (p < 0.05) in the biochemical indices but no histological alterations in exposed C. gariepinus after 28 days. The results demonstrate that the effluent poses potential risks to the aquatic organisms and ecosystem services provided by the river. We recommend that environmental regulatory agencies and stakeholders should establish effluent and solid wastes management systems at the market to prevent environmental and public health epidemics within the framework of the United Nations Sustainable Development Goals 6 (clean water and sanitation) and 14 (life below water). Graphical abstract ᅟ.
Collapse
Affiliation(s)
- Esther I Olaniran
- Ecotoxicology and Conservation Unit, Department of Zoology, Faculty of Science, University of Lagos, Lagos, Akoka, 101017, Nigeria
| | - Temitope Olawunmi Sogbanmu
- Ecotoxicology and Conservation Unit, Department of Zoology, Faculty of Science, University of Lagos, Lagos, Akoka, 101017, Nigeria.
| | - Joseph K Saliu
- Ecotoxicology and Conservation Unit, Department of Zoology, Faculty of Science, University of Lagos, Lagos, Akoka, 101017, Nigeria
| |
Collapse
|
207
|
Machowska A, Stålsby Lundborg C. Drivers of Irrational Use of Antibiotics in Europe. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2018; 16:E27. [PMID: 30583571 PMCID: PMC6338985 DOI: 10.3390/ijerph16010027] [Citation(s) in RCA: 169] [Impact Index Per Article: 28.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/12/2018] [Revised: 12/13/2018] [Accepted: 12/19/2018] [Indexed: 11/17/2022]
Abstract
The unnecessary use of antibiotics and concomitant rapid growth of antibiotic resistance (ABR) is a widely acknowledged threat to global health, development, and sustainability. While the underlying cause of ABR is undoubtedly the overall volume of antibiotic use in general, irrational antibiotic use, which is influenced by several interrelated factors, is a major contributory factor. Here, we aimed to present and describe selected main drivers of irrational use of antibiotics in Europe. We performed a broad search of the current literature in databases such as PubMed, Google Scholar, Cochrane, as well as various institutional websites (World Health Organization, European Observatory, European Commission) to provide a new perspective on selected drivers of irrational antibiotic use in Europe. We also searched for relevant literature using snowballing, i.e., using reference lists of papers to identify additional papers. In this narrative review, we present that major factors among the general public driving antibiotic resistance are lack of public knowledge and awareness, access to antibiotics without prescription and leftover antibiotics, and knowledge attitude and perception of prescribers and dispensers, inadequate medical training, pharmaceutical promotion, lack of rapid and sufficient diagnostic tests, and patient⁻doctor interaction as major factors among healthcare providers. We further discuss initiatives that, if taken and implemented, can have an impact on and improve the current situation in Europe.
Collapse
Affiliation(s)
- Anna Machowska
- Global Health-Health Systems and Policy: Medicines, Focusing Antibiotics, Department of Public Health Sciences, Karolinska Institutet, 171 77 Stockholm, Sweden.
| | - Cecilia Stålsby Lundborg
- Global Health-Health Systems and Policy: Medicines, Focusing Antibiotics, Department of Public Health Sciences, Karolinska Institutet, 171 77 Stockholm, Sweden.
| |
Collapse
|
208
|
A survey of reported behaviours, attitudes and knowledge related to antibiotic use of hospitalised patients in Thailand. Infect Dis Health 2018. [DOI: 10.1016/j.idh.2018.05.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
209
|
Lai PK, Geldart K, Ritter S, Kaznessis YN, Hackel BJ. Systematic Mutagenesis of Oncocin Reveals Enhanced Activity and Insights into the Mechanisms of Antimicrobial Activity. MOLECULAR SYSTEMS DESIGN & ENGINEERING 2018; 3:930-941. [PMID: 31105969 PMCID: PMC6519479 DOI: 10.1039/c8me00051d] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Oncocin is a proline-rich antimicrobial peptide that inhibits protein synthesis by binding to the bacterial ribosome. In this work, the antimicrobial activity of oncocin was improved by systematic peptide mutagenesis and activity evaluation. We found that a pair of cationic substitutions (P4K and L7K/R) improves the activity by 2-4 fold (p<0.05) against multiple Gram-negative bacteria. An in vitro transcription / translation assay indicated that the increased activity was not because of stronger ribosome binding. Rather a cellular internalization assay revealed a higher internalization rate for the optimized analogs thereby suggesting a mechanism to increase potency. In addition, we found that the optimized peptides' benefit is dependent upon nutrient-depleted media conditions. The molecular design and characterization strategies have broad potential for development of antimicrobial peptides.
Collapse
Affiliation(s)
- Pin-Kuang Lai
- Department of Chemical Engineering and Materials Science, University of Minnesota - Twin Cities, Minneapolis, MN 55455, USA
| | - Kathryn Geldart
- Department of Chemical Engineering and Materials Science, University of Minnesota - Twin Cities, Minneapolis, MN 55455, USA
| | - Seth Ritter
- Department of Chemical Engineering and Materials Science, University of Minnesota - Twin Cities, Minneapolis, MN 55455, USA
| | - Yiannis N Kaznessis
- Department of Chemical Engineering and Materials Science, University of Minnesota - Twin Cities, Minneapolis, MN 55455, USA
| | - Benjamin J Hackel
- Department of Chemical Engineering and Materials Science, University of Minnesota - Twin Cities, Minneapolis, MN 55455, USA
| |
Collapse
|
210
|
Baker JE, Boudreau RM, Seitz AP, Caldwell CC, Gulbins E, Edwards MJ. Sphingolipids and Innate Immunity: A New Approach to Infection in the Post-Antibiotic Era? Surg Infect (Larchmt) 2018; 19:792-803. [DOI: 10.1089/sur.2018.187] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Affiliation(s)
- Jennifer E. Baker
- Division of Research, Department of Surgery, University of Cincinnati, Cincinnati, Ohio
| | - Ryan M. Boudreau
- Division of Research, Department of Surgery, University of Cincinnati, Cincinnati, Ohio
| | - Aaron P. Seitz
- Division of Research, Department of Surgery, University of Cincinnati, Cincinnati, Ohio
| | - Charles C. Caldwell
- Division of Research, Department of Surgery, University of Cincinnati, Cincinnati, Ohio
- Division of Research, Shriners Hospital for Children, Cincinnati, Ohio
| | - Erich Gulbins
- Division of Research, Department of Surgery, University of Cincinnati, Cincinnati, Ohio
- Department of Molecular Biology, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
| | - Michael J. Edwards
- Division of Research, Department of Surgery, University of Cincinnati, Cincinnati, Ohio
| |
Collapse
|
211
|
Horumpende PG, Sonda TB, van Zwetselaar M, Antony ML, Tenu FF, Mwanziva CE, Shao ER, Mshana SE, Mmbaga BT, Chilongola JO. Prescription and non-prescription antibiotic dispensing practices in part I and part II pharmacies in Moshi Municipality, Kilimanjaro Region in Tanzania: A simulated clients approach. PLoS One 2018; 13:e0207465. [PMID: 30462700 PMCID: PMC6248976 DOI: 10.1371/journal.pone.0207465] [Citation(s) in RCA: 62] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2018] [Accepted: 10/31/2018] [Indexed: 11/18/2022] Open
Abstract
Antibiotic dispensing without a prescription poses a threat to public health as it leads to excessive antibiotic consumption. Inappropriate antibiotic availability to the community has been documented to be amongst drivers of antimicrobial resistance emergence. Community pharmacies are a source of antibiotics in low and middle-income countries (LMICs). We aimed at assessing antibiotic dispensing practices by community pharmacy retailers in Moshi urban, Kilimanjaro, Tanzania and recommend interventions to improve practice. Using a Simulated Client (SC) Method, an observational cross-sectional survey of antibiotic dispensing practices was conducted from 10th June to 10th July 2017. Data analysis was done using Stata 13 (StataCorp, College Station, TX, USA). A total of 82 pharmacies were visited. Part I pharmacies were 26 (31.71%) and 56 (68.29%) were part II. Overall 92.3% (95% CI 77.8-97.6) of retailers dispensed antibiotics without prescriptions. The antibiotics most commonly dispensed without a prescription were ampiclox for cough (3 encounters) and azithromycin for painful urination (3 encounters). An oral third generation cephalosporin (cefixime) was dispensed once for painful urination without prescription by a part I pharmacy retailer. Out of 21, 15(71.43%) prescriptions with incomplete doses were accepted and had antibiotics dispensed. Out of 68, 4(5.9%) retailers gave instructions for medicine use voluntarily. None of the retailers voluntarily explained drug side-effects. In Moshi pharmacies, a high proportion of antibiotics are sold and dispensed without prescriptions. Instructions for medicine use are rarely given and none of the retailers explain side effects. These findings support the need for a legislative enforcement of prescription-only antibiotic dispensing rules and regulations. Initiation of clinician and community antibiotic stewardship and educational programs on proper antibiotic use to both pharmacists and public by the regulatory bodies are highly needed.
Collapse
Affiliation(s)
- Pius G. Horumpende
- Department of Biochemistry and Molecular Biology, Kilimanjaro Christian Medical University College, Moshi, Tanzania
- Kilimanjaro Clinical Research Institute, Moshi, Tanzania
- Department of Preventive Medicine and Research, Lugalo General Military Hospital and Military College of Medical Sciences (MCMS), Dar es Salaam, Tanzania
| | - Tolbert B. Sonda
- Department of Biochemistry and Molecular Biology, Kilimanjaro Christian Medical University College, Moshi, Tanzania
- Kilimanjaro Clinical Research Institute, Moshi, Tanzania
| | | | - Magreth L. Antony
- Section of HIV Viral Load and Early Infant Diagnostics, National Health Laboratory Quality Assurance and Training Centre, Dar es Salaam, Tanzania
| | - Filemon F. Tenu
- Department of Biochemistry and Molecular Biology, Kilimanjaro Christian Medical University College, Moshi, Tanzania
| | - Charles E. Mwanziva
- Department of Preventive Medicine and Research, Lugalo General Military Hospital and Military College of Medical Sciences (MCMS), Dar es Salaam, Tanzania
| | - Elichilia R. Shao
- Department of Biochemistry and Molecular Biology, Kilimanjaro Christian Medical University College, Moshi, Tanzania
| | - Stephen E. Mshana
- Department of Microbiology and Immunology, Catholic University of Health and Allied Sciences, Mwanza, Tanzania
| | | | - Jaffu O. Chilongola
- Department of Biochemistry and Molecular Biology, Kilimanjaro Christian Medical University College, Moshi, Tanzania
- Kilimanjaro Clinical Research Institute, Moshi, Tanzania
| |
Collapse
|
212
|
Faya M, Kalhapure RS, Dhumal D, Agrawal N, Omolo C, Akamanchi KG, Govender T. Antimicrobial cell penetrating peptides with bacterial cell specificity: pharmacophore modelling, quantitative structure activity relationship and molecular dynamics simulation. J Biomol Struct Dyn 2018; 37:2370-2380. [PMID: 30047310 DOI: 10.1080/07391102.2018.1484814] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
Current research has shown cell-penetrating peptides and antimicrobial peptides (AMPs) as probable vectors for use in drug delivery and as novel antibiotics. It has been reported that the higher the therapeutic index (TI) the higher would be the bacterial cell penetrating ability. To the best of our knowledge, no in-silico study has been performed to determine bacterial cell specificity of the antimicrobial cell penetrating peptides (aCPP's) based on their TI. The aim of this study was to develop a quantitative structure activity relationship (QSAR) model, which can estimate antimicrobial potential and cell-penetrating ability of aCPPs against S. aureus, to confirm the relationship between the TI and aCPPs and to identify specific descriptors responsible for aCPPs penetrating ability. Molecular dynamics (MD) simulation was also performed to confirm the membrane insertion of the most active aCPPs obtained from the QSAR study. The most appropriate pharmacophore was identified to predict the aCPP's activity. The statistical results confirmed the validity of the model. The QSAR model was successful in identifying the optimal aCPP with high activity prediction and provided insights into the structural requirements to correlate their TI to cell penetrating ability. MD simulation of the best aCPP with 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC) bilayer confirmed its interaction with the membrane and the C-terminal residues of the aCPP played a key role in membrane penetration. The strategy of combining QSAR and molecular dynamics, allowed for optimal estimation of ligand-target interaction and confirmed the importance of Trp and Lys in interacting with the POPC bilayer. Communicated by Ramaswamy H. Sarma.
Collapse
Affiliation(s)
- Mbuso Faya
- a Department of Pharmaceutical Sciences , University of KwaZulu-Natal , Private Bag , Durban , South Africa
| | - Rahul S Kalhapure
- a Department of Pharmaceutical Sciences , University of KwaZulu-Natal , Private Bag , Durban , South Africa
| | - Dinesh Dhumal
- b Department of Pharmaceutical Sciences and Technology , Institute of Chemical Technology , Mumbai , India
| | - Nikhil Agrawal
- a Department of Pharmaceutical Sciences , University of KwaZulu-Natal , Private Bag , Durban , South Africa
| | - Calvin Omolo
- a Department of Pharmaceutical Sciences , University of KwaZulu-Natal , Private Bag , Durban , South Africa
| | - Krishnacharya G Akamanchi
- b Department of Pharmaceutical Sciences and Technology , Institute of Chemical Technology , Mumbai , India
| | - Thirumala Govender
- a Department of Pharmaceutical Sciences , University of KwaZulu-Natal , Private Bag , Durban , South Africa
| |
Collapse
|
213
|
Agrawal P, Raghava GPS. Prediction of Antimicrobial Potential of a Chemically Modified Peptide From Its Tertiary Structure. Front Microbiol 2018; 9:2551. [PMID: 30416494 PMCID: PMC6212470 DOI: 10.3389/fmicb.2018.02551] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2018] [Accepted: 10/05/2018] [Indexed: 12/14/2022] Open
Abstract
Designing novel antimicrobial peptides is a hot area of research in the field of therapeutics especially after the emergence of resistant strains against the conventional antibiotics. In the past number of in silico methods have been developed for predicting the antimicrobial property of the peptide containing natural residues. This study describes models developed for predicting the antimicrobial property of a chemically modified peptide. Our models have been trained, tested and evaluated on a dataset that contains 948 antimicrobial and 931 non-antimicrobial peptides, containing chemically modified and natural residues. Firstly, the tertiary structure of all peptides has been predicted using software PEPstrMOD. Structure analysis indicates that certain type of modifications enhance the antimicrobial property of peptides. Secondly, a wide range of features was computed from the structure of these peptides using software PaDEL. Finally, models were developed for predicting the antimicrobial potential of chemically modified peptides using a wide range of structural features of these peptides. Our best model based on support vector machine achieve maximum MCC of 0.84 with an accuracy of 91.62% on training dataset and MCC of 0.80 with an accuracy of 89.89% on validation dataset. To assist the scientific community, we have developed a web server called "AntiMPmod" which predicts the antimicrobial property of the chemically modified peptide. The web server is present at the following link (http://webs.iiitd.edu.in/raghava/antimpmod/).
Collapse
Affiliation(s)
- Piyush Agrawal
- CSIR-Institute of Microbial Technology, Chandigarh, India.,Center for Computational Biology, Indraprastha Institute of Information Technology, Delhi, New Delhi, India
| | - Gajendra P S Raghava
- Center for Computational Biology, Indraprastha Institute of Information Technology, Delhi, New Delhi, India
| |
Collapse
|
214
|
Korzeniewska E, Harnisz M. Relationship between modification of activated sludge wastewater treatment and changes in antibiotic resistance of bacteria. THE SCIENCE OF THE TOTAL ENVIRONMENT 2018; 639:304-315. [PMID: 29791883 DOI: 10.1016/j.scitotenv.2018.05.165] [Citation(s) in RCA: 75] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2018] [Revised: 05/13/2018] [Accepted: 05/13/2018] [Indexed: 05/23/2023]
Abstract
Biological treatment processes at wastewater treatment plants (WWTPs), which are the most common methods of sewage treatment, could cause selective elimination and/or changes in the proportions of phenotypes/genotypes within bacterial populations in effluent. Therefore, WWTPs based on activated sludge used in sewage treatment constitute an important reservoir of enteric bacteria which harbour potentially transferable resistance genes. Together with treated wastewater, these microorganisms can penetrate the soil, surface water, rural groundwater supplies and drinking water. Because of this, the aim of this study was to determine the impact of various modification of sewage treatment (the conventional anaerobic/anoxic/oxic (A2/O) process, mechanical-biological (MB) system, sequencing batch reactors (SBR), mechanical-biological system with elevated removal of nutrients (MB-ERN)) on the amount of antibiotic resistant bacteria (ARB) (including E. coli) and antibiotic resistance genes (ARGs) in sewage flowing out of the 13 treatment plants using activated sludge technology. There were no significant differences in ARB and ARGs regardless of time of sampling and type of treated wastewater (p > 0.05). The highest percentage of reduction (up to 99.9%) in the amount of ARB and ARGs was observed in WWTPs with MB and MB-ERN systems. The lowest reduction was detected in WWTPs with SBR. A significant increase (p < 0.05) in the percentage of bacteria resistant to the new generation antibiotics (CTX and DOX) in total counts of microorganisms was observed in effluents (EFF) from WWTPs with A2/O system and with SBR. Among all ARGs analyzed, the highest prevalence of ARGs copies in EFF samples was observed for sul1, tet(A) and qepA, the lowest for blaTEM and blaSHV. Although, the results of presented study demonstrate high efficiency of ARB and ARGs removal during the wastewater treatment processes, especially by WWTPs with MB and MB-ERN systems, EFF is still an important reservoir of ARGs which can be transferred to other microorganisms.
Collapse
Affiliation(s)
- Ewa Korzeniewska
- Department of Environmental Microbiology, Faculty of Environmental Sciences, University of Warmia and Mazury in Olsztyn, Prawocheńskiego 1 Str., 10-720 Olsztyn, Poland.
| | - Monika Harnisz
- Department of Environmental Microbiology, Faculty of Environmental Sciences, University of Warmia and Mazury in Olsztyn, Prawocheńskiego 1 Str., 10-720 Olsztyn, Poland.
| |
Collapse
|
215
|
Yadav S, Mahato M, Jha D, Ahmadi Z, Gautam H, Sharma A. Enhanced antibacterial activity of tetramethylguanidinium-conjugated linear polyethylenimine polymers. INT J POLYM MATER PO 2018. [DOI: 10.1080/00914037.2017.1393679] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- S. Yadav
- CSIR-Institute of Genomics and Integrative Biology, Mall Road, Delhi, India
| | - M. Mahato
- CSIR-Institute of Genomics and Integrative Biology, Mall Road, Delhi, India
| | - D. Jha
- CSIR-Institute of Genomics and Integrative Biology, Sukhdev Vihar, New Delhi, India
| | - Z. Ahmadi
- CSIR-Institute of Genomics and Integrative Biology, Mall Road, Delhi, India
| | - H.K. Gautam
- CSIR-Institute of Genomics and Integrative Biology, Sukhdev Vihar, New Delhi, India
| | - A.K. Sharma
- CSIR-Institute of Genomics and Integrative Biology, Mall Road, Delhi, India
| |
Collapse
|
216
|
Aslam B, Wang W, Arshad MI, Khurshid M, Muzammil S, Rasool MH, Nisar MA, Alvi RF, Aslam MA, Qamar MU, Salamat MKF, Baloch Z. Antibiotic resistance: a rundown of a global crisis. Infect Drug Resist 2018; 11:1645-1658. [PMID: 30349322 PMCID: PMC6188119 DOI: 10.2147/idr.s173867] [Citation(s) in RCA: 1163] [Impact Index Per Article: 193.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
The advent of multidrug resistance among pathogenic bacteria is imperiling the worth of antibiotics, which have previously transformed medical sciences. The crisis of antimicrobial resistance has been ascribed to the misuse of these agents and due to unavailability of newer drugs attributable to exigent regulatory requirements and reduced financial inducements. Comprehensive efforts are needed to minimize the pace of resistance by studying emergent microorganisms, resistance mechanisms, and antimicrobial agents. Multidisciplinary approaches are required across health care settings as well as environment and agriculture sectors. Progressive alternate approaches including probiotics, antibodies, and vaccines have shown promising results in trials that suggest the role of these alternatives as preventive or adjunct therapies in future.
Collapse
Affiliation(s)
- Bilal Aslam
- Department of Microbiology, Government College University Faisalabad, Faisalabad, Pakistan
| | - Wei Wang
- NHC Key Laboratory of Food Safety Risk Assessment, China National Center for Food Safety Risk Assessment, Beijing, China
| | - Muhammad Imran Arshad
- Institute of Microbiology, University of Agriculture Faisalabad, Faisalabad, Pakistan
| | - Mohsin Khurshid
- Department of Microbiology, Government College University Faisalabad, Faisalabad, Pakistan.,College of Allied Health Professionals, Directorate of Medical Sciences, Government College University Faisalabad, Faisalabad, Pakistan
| | - Saima Muzammil
- Department of Microbiology, Government College University Faisalabad, Faisalabad, Pakistan
| | | | - Muhammad Atif Nisar
- Department of Microbiology, Government College University Faisalabad, Faisalabad, Pakistan
| | - Ruman Farooq Alvi
- Department of Microbiology, Government College University Faisalabad, Faisalabad, Pakistan
| | - Muhammad Aamir Aslam
- Institute of Microbiology, University of Agriculture Faisalabad, Faisalabad, Pakistan
| | - Muhammad Usman Qamar
- Department of Microbiology, Government College University Faisalabad, Faisalabad, Pakistan
| | | | - Zulqarnain Baloch
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, China,
| |
Collapse
|
217
|
Mokashe N, Chaudhari B, Patil U. Operative utility of salt-stable proteases of halophilic and halotolerant bacteria in the biotechnology sector. Int J Biol Macromol 2018; 117:493-522. [DOI: 10.1016/j.ijbiomac.2018.05.217] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2018] [Revised: 05/27/2018] [Accepted: 05/28/2018] [Indexed: 09/30/2022]
|
218
|
Zakharova OV, Gusev AA, Altabaeva YV, Perova SY. Biological Effects of Freshly Prepared and 24-h Aqueous Dispersions of Copper and Copper Oxide Nanoparticles on E. coli Bacteria. ACTA ACUST UNITED AC 2018. [DOI: 10.1134/s1995078018020180] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
219
|
Pandey A, Aggarwal N, Adholeya A, Kochar M. Resurrection of Nalidixic Acid: Evaluation of Water-Based Nanoformulations as Potential Nanomedicine. NANOSCALE RESEARCH LETTERS 2018; 13:298. [PMID: 30251124 PMCID: PMC6153259 DOI: 10.1186/s11671-018-2718-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/18/2018] [Accepted: 09/13/2018] [Indexed: 06/08/2023]
Abstract
Resistance to quinolone antibiotics has been a serious problem ever since nalidixic acid was introduced into clinical medicine. Over time, resistance of pathogenic microbes to nalidixic acid led to the design of novel variants to revive its potential application. In the present work, a series of eight nanoformulations of nalidixic acid-based diacyl and sulfonyl acyl hydrazine derivatives were prepared. All nanoformulations were found to be stable at different storage temperatures. Antibacterial and anticandida activity of the eight nanoformulations presented encouraging results when compared with their non-nano parent counterparts. The nanoformulations of chloro, furanyl, and sulfonyl acyl substituted derivatives of nalidixic acid displayed most promising results (MIC ranging from 50 to 100 μg mL-1) against the tested bacteria and yeast. Among the screened bacteria, Acinetobacter baumannii displayed maximum sensitivity to the above nanoformulations. Biosafety study on the mammalian model-wax moth, Galleria mellonella-showed that all eight prepared nanoformulations were absolutely nontoxic to the larvae and subsequent pupae and hence may likely have no or low toxicity against mammalian systems.
Collapse
Affiliation(s)
- Alka Pandey
- TERI-Deakin Nanobiotechnology Centre, TERI Gram, The Energy and Resources Institute, Gwal Pahari, Gurugram, Haryana 122003 India
| | - Nisha Aggarwal
- Department of Chemistry, Sri Aurobindo College, University of Delhi, New Delhi, India
| | - Alok Adholeya
- TERI-Deakin Nanobiotechnology Centre, TERI Gram, The Energy and Resources Institute, Gwal Pahari, Gurugram, Haryana 122003 India
| | - Mandira Kochar
- TERI-Deakin Nanobiotechnology Centre, TERI Gram, The Energy and Resources Institute, Gwal Pahari, Gurugram, Haryana 122003 India
| |
Collapse
|
220
|
Sultan I, Rahman S, Jan AT, Siddiqui MT, Mondal AH, Haq QMR. Antibiotics, Resistome and Resistance Mechanisms: A Bacterial Perspective. Front Microbiol 2018; 9:2066. [PMID: 30298054 PMCID: PMC6160567 DOI: 10.3389/fmicb.2018.02066] [Citation(s) in RCA: 143] [Impact Index Per Article: 23.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2018] [Accepted: 08/13/2018] [Indexed: 12/28/2022] Open
Abstract
History of mankind is regarded as struggle against infectious diseases. Rather than observing the withering away of bacterial diseases, antibiotic resistance has emerged as a serious global health concern. Medium of antibiotic resistance in bacteria varies greatly and comprises of target protection, target substitution, antibiotic detoxification and block of intracellular antibiotic accumulation. Further aggravation to prevailing situation arose on observing bacteria gradually becoming resistant to different classes of antibiotics through acquisition of resistance genes from same and different genera of bacteria. Attributing bacteria with feature of better adaptability, dispersal of antibiotic resistance genes to minimize effects of antibiotics by various means including horizontal gene transfer (conjugation, transformation, and transduction), Mobile genetic elements (plasmids, transposons, insertion sequences, integrons, and integrative-conjugative elements) and bacterial toxin-antitoxin system led to speedy bloom of antibiotic resistance amongst bacteria. Proficiency of bacteria to obtain resistance genes generated an unpleasant situation; a grave, but a lot unacknowledged, feature of resistance gene transfer.
Collapse
Affiliation(s)
- Insha Sultan
- Department of Biosciences, Jamia Millia Islamia, New Delhi, India
| | - Safikur Rahman
- Department of Medical Biotechnology, Yeungnam University, Gyeongsan, South Korea
| | - Arif Tasleem Jan
- School of Biosciences and Biotechnology, Baba Ghulam Shah Badshah University, Rajouri, India
| | | | | | | |
Collapse
|
221
|
Xu D, Chen W, Tobin-Miyaji YJ, Sturge CR, Yang S, Elmore B, Singh A, Pybus C, Greenberg DE, Sellati TJ, Qiang W, Dong H. Fabrication and Microscopic and Spectroscopic Characterization of Cytocompatible Self-Assembling Antimicrobial Nanofibers. ACS Infect Dis 2018; 4:1327-1335. [PMID: 29949345 DOI: 10.1021/acsinfecdis.8b00069] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The discovery of antimicrobial peptides (AMPs) has brought tremendous promise and opportunities to overcome the prevalence of bacterial resistance to commonly used antibiotics. However, their widespread use and translation into clinical application is hampered by the moderate to severe hemolytic activity and cytotoxicity. Here, we presented and validated a supramolecular platform for the construction of hemo- and cytocompatible AMP-based nanomaterials, termed self-assembling antimicrobial nanofibers (SAANs). SAANs, the "nucleus" of our antimicrobial therapeutic platform, are supramolecular assemblies of de novo designed AMPs that undergo programmed self-assembly into nanostructured fibers to "punch holes" in the bacterial membrane, thus killing the bacterial pathogen. In this study, we performed solid-state NMR spectroscopy showing predominant antiparallel β-sheet assemblies rather than monomers to interact with liposomes. We investigated the mode of antimicrobial action of SAANs using transmission electron microscopy and provided compelling microscopic evidence that self-assembled nanofibers were physically in contact with bacterial cells causing local membrane deformation and rupture. While effectively killing bacteria, SAANs, owing to their nanoparticulate nature, were found to cross mammalian cell membranes harmlessly with greatly reduced membrane accumulation and possess exceptional cytocompatibility and hemocompatibility compared to natural AMPs. Through these systematic investigations, we expect to establish this new paradigm for the customized design of SAANs that will provide exquisite, tunable control of both bactericidal activity and cytocompatibility and can potentially overcome the drawbacks of traditional AMPs.
Collapse
Affiliation(s)
- Dawei Xu
- Department of Chemistry and Biomolecular Science, Clarkson University, Potsdam, New York 13699, United States
| | - Weike Chen
- Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, Texas 76019, United States
| | - Yuto J. Tobin-Miyaji
- Department of Chemistry, Binghamton University, SUNY, Binghamton, New York 13902, United States
| | - Carolyn R. Sturge
- Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas 75390, United States
| | - Su Yang
- Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, Texas 76019, United States
| | - Brendan Elmore
- Department of Chemistry and Biomolecular Science, Clarkson University, Potsdam, New York 13699, United States
| | - Anju Singh
- Department of Infectious Diseases, Drug Discovery Division, Southern Research Institute, Birmingham, Alabama 35255, United States
| | - Christine Pybus
- Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas 75390, United States
| | - David E. Greenberg
- Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas 75390, United States
- Department of Microbiology, University of Texas Southwestern Medical Center, Dallas, Texas 75390, United States
| | - Timothy J. Sellati
- Department of Infectious Diseases, Drug Discovery Division, Southern Research Institute, Birmingham, Alabama 35255, United States
| | - Wei Qiang
- Department of Chemistry, Binghamton University, SUNY, Binghamton, New York 13902, United States
| | - He Dong
- Department of Chemistry and Biomolecular Science, Clarkson University, Potsdam, New York 13699, United States
- Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, Texas 76019, United States
| |
Collapse
|
222
|
Tavares LJ, de Avila ED, Klein MI, Panariello BHD, Spolidório DMP, Pavarina AC. Antimicrobial photodynamic therapy alone or in combination with antibiotic local administration against biofilms of Fusobacterium nucleatum and Porphyromonas gingivalis. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2018; 188:135-145. [PMID: 30267963 DOI: 10.1016/j.jphotobiol.2018.09.010] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2018] [Revised: 09/05/2018] [Accepted: 09/11/2018] [Indexed: 12/18/2022]
Abstract
Antimicrobial photodynamic therapy (aPDT) kills several planktonic pathogens. However, the susceptibility of biofilm-derived anaerobic bacteria to aPDT is poorly characterized. Here, we evaluated the effect of Photodithazine (PDZ)-mediated aPDT on Fusobacterium nucleatum and Porphyromonas gingivalis biofilms. In addition, aPDT was tested with metronidazole (MTZ) to explore the potential antimicrobial effect of the treatment. The minimum inhibitory concentration (MIC) of MTZ was defined for each bacterial species. Single-species biofilms of each species were grown on polystyrene plates under anaerobic conditions for five days. aPDT was performed by applying PDZ at concentrations of 50, 75 and 100 mg/L, followed by exposure to 50 J/cm2 LED light (660 nm) with or without MTZ. aPDT exhibited a significant reduction in bacterial viability at a PDZ concentration of 100 mg/L, with 1.12 log10 and 2.66 log10 reductions for F. nucleatum and P. gingivalis in biofilms, respectively. However, the antimicrobial effect against F. nucleatum was achieved only when aPDT was combined with MTZ at 100× MIC. Regarding P. gingivalis, the combination of PDZ-mediated aPDT at 100 mg/L with MTZ 100× MIC resulted in a 5 log10 reduction in the bacterial population. The potential antimicrobial effects of aPDT in combination with MTZ for both single pathogenic biofilms were confirmed by live/dead staining. These results suggest that localized antibiotic administration may be an adjuvant to aPDT to control F. nucleatum and P. gingivalis biofilms.
Collapse
Affiliation(s)
- Lívia J Tavares
- Department of Dental Materials and Prosthodontics, São Paulo State University (Unesp), School of Dentistry, Araraquara, Rua Humaitá, 1680, 14801-903 Araraquara, SP, Brazil
| | - Erica D de Avila
- Department of Dental Materials and Prosthodontics, São Paulo State University (Unesp), School of Dentistry, Araraquara, Rua Humaitá, 1680, 14801-903 Araraquara, SP, Brazil
| | - Marlise I Klein
- Department of Dental Materials and Prosthodontics, São Paulo State University (Unesp), School of Dentistry, Araraquara, Rua Humaitá, 1680, 14801-903 Araraquara, SP, Brazil
| | - Beatriz H D Panariello
- Department of Cariology, Operative Dentistry and Dental Public Health, Indiana University School of Dentistry, 1121 W Michigan St, DS406, Indianapolis, IN 46202, USA
| | - Denise M P Spolidório
- Department of Physiology and Pathology, São Paulo State University (Unesp), School of Dentistry, Araraquara, Rua Humaitá, 1680, 14801-903, Araraquara, SP, Brazil
| | - Ana Cláudia Pavarina
- Department of Dental Materials and Prosthodontics, São Paulo State University (Unesp), School of Dentistry, Araraquara, Rua Humaitá, 1680, 14801-903 Araraquara, SP, Brazil.
| |
Collapse
|
223
|
Lu L, Liu J, Li Z, Liu Z, Guo J, Xiao Y, Yang J. Occurrence and Distribution of Tetracycline Antibiotics and Resistance Genes in Longshore Sediments of the Three Gorges Reservoir, China. Front Microbiol 2018; 9:1911. [PMID: 30174664 PMCID: PMC6108234 DOI: 10.3389/fmicb.2018.01911] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Accepted: 07/30/2018] [Indexed: 01/12/2023] Open
Abstract
The widespread use of antibiotics and the induced antibiotic resistance genes have attracted much attention in recent years. The longshore sediments in the water-level-fluctuating zone of the Three Gorges Reservoir were selected to investigate the spatial-temporal distribution of antibiotics and antibiotic resistance genes in two different operation stages (low-water level in summer and high-water level in winter). Three kinds of tetracycline antibiotics (tetracycline, oxytetracycline, and chlortetracycline) and three kinds of tetracycline resistance genes [tet(A), tet(C), and tet(M)] were analyzed and quantified. The results showed that the distribution of tetracyclines and resistance genes in riverine, transition and lacustrine zones showed a certain regularity, and the tetracycline antibiotics concentration and the total abundance of the tetracycline resistance genes were highest in the transition zone, and then the riverine zone. Meanwhile, there were significant seasonal variations of tetracycline and the resistance genes. The concentrations of the tetracycline and resistance genes were higher in summer than those in winter, while the relative abundance of resistance genes was higher in winter. It was suggested that the different seasonal distribution of antibiotics and resistance genes may be correlated with the reservoir operation in the Three Gorges Reservoir and the higher use of antibiotics in winter. In addition, Pearson correlation analysis showed that the concentrations of the tetracycline, class 1 integron and 16S rRNA were positively correlated with the abundance of the tetracycline resistance genes.
Collapse
Affiliation(s)
- Lunhui Lu
- CAS Key Laboratory of Reservoir Aquatic Environment, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, China
| | - Jie Liu
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing, China
| | - Zhe Li
- CAS Key Laboratory of Reservoir Aquatic Environment, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, China.,Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing, China
| | - Zhiping Liu
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing, China
| | - Jinsong Guo
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing, China
| | - Yan Xiao
- CAS Key Laboratory of Reservoir Aquatic Environment, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, China
| | - Jixiang Yang
- CAS Key Laboratory of Reservoir Aquatic Environment, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, China
| |
Collapse
|
224
|
Jaggupilli A, Singh N, De Jesus VC, Gounni MS, Dhanaraj P, Chelikani P. Chemosensory bitter taste receptors (T2Rs) are activated by multiple antibiotics. FASEB J 2018; 33:501-517. [PMID: 30011231 DOI: 10.1096/fj.201800521rr] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Many medications including antibiotics taste bitter. The potency of these antibiotics on the 25 bitter taste receptors (T2Rs) in humans remains poorly understood. Here we characterize by sensory and structure-function analyses how antibiotics frequently used to treat airway infections in cystic fibrosis activate multiple human T2Rs. The potency of the broad-spectrum antibiotics, tobramycin, levofloxacin, and azithromycin on the highly expressed T2Rs in airways, T2R4, T2R14, and T2R20 was pursued. The amino acids and structural features of T2R4, T2R14, and T2R20 important for antibiotic binding were characterized by mutational analysis in heterologous cell-based assays. Strikingly, extracellular loop 2 in T2Rs performs a key function in binding to antibiotics with contribution from residues in transmembrane helices. Our results suggest that different antibiotics activate multiple T2Rs with different potencies. An understanding of the nonantibiotic and physiologic effects mediated through T2Rs on the host cells is much needed.-Jaggupilli, A., Singh, N., De Jesus, V. C., Gounni, M. S., Dhanaraj, P., Chelikani, P. Chemosensory bitter taste receptors (T2Rs) are activated by multiple antibiotics.
Collapse
Affiliation(s)
- Appalaraju Jaggupilli
- Manitoba Chemosensory Biology Research Group and Department of Oral Biology, University of Manitoba, Children's Hospital Research Institute of Manitoba (CHRIM), Winnipeg, Manitoba, Canada
| | - Nisha Singh
- Manitoba Chemosensory Biology Research Group and Department of Oral Biology, University of Manitoba, Children's Hospital Research Institute of Manitoba (CHRIM), Winnipeg, Manitoba, Canada
| | - Vivianne Cruz De Jesus
- Manitoba Chemosensory Biology Research Group and Department of Oral Biology, University of Manitoba, Children's Hospital Research Institute of Manitoba (CHRIM), Winnipeg, Manitoba, Canada
| | - Mohamed Soussi Gounni
- Manitoba Chemosensory Biology Research Group and Department of Oral Biology, University of Manitoba, Children's Hospital Research Institute of Manitoba (CHRIM), Winnipeg, Manitoba, Canada
| | - Premnath Dhanaraj
- Manitoba Chemosensory Biology Research Group and Department of Oral Biology, University of Manitoba, Children's Hospital Research Institute of Manitoba (CHRIM), Winnipeg, Manitoba, Canada
| | - Prashen Chelikani
- Manitoba Chemosensory Biology Research Group and Department of Oral Biology, University of Manitoba, Children's Hospital Research Institute of Manitoba (CHRIM), Winnipeg, Manitoba, Canada
| |
Collapse
|
225
|
Brower JL. The Threat and Response to Infectious Diseases (Revised). MICROBIAL ECOLOGY 2018; 76:19-36. [PMID: 27480226 PMCID: PMC7080028 DOI: 10.1007/s00248-016-0806-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2015] [Accepted: 06/20/2016] [Indexed: 06/06/2023]
Abstract
The threat from microorganisms is complex, and the approaches for reducing the challenges the world is facing are also multifaceted, but a combination approach including several simple steps can make a difference and reduce morbidity and mortality and the economic cost of fighting infectious diseases. This paper discusses the continually evolving infectious disease landscape, contributing factors in the rise of the threat, reasons for optimism, and the policies, technologies, actions, and institutions that might be harnessed to further reduce the dangers introduced by pathogens. It builds upon and updates the work of other authors that have recognized the dangers of emerging and re-emerging pathogens and have explored and documented potential solutions.
Collapse
|
226
|
Pandey G, Khatoon S, Pandey MM, Rawat AKS. Altitudinal variation of berberine, total phenolics and flavonoid content in Thalictrum foliolosum and their correlation with antimicrobial and antioxidant activities. J Ayurveda Integr Med 2018; 9:169-176. [PMID: 29102462 PMCID: PMC6148047 DOI: 10.1016/j.jaim.2017.02.010] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2016] [Revised: 02/08/2017] [Accepted: 02/11/2017] [Indexed: 11/25/2022] Open
Abstract
Background The quality of herbal medicine is determined by its secondary metabolites, which may vary according to growth, season and altitude etc. Objective We studied the variation in phytochemistry and biological activities of Thalictrum foliolosum (TF) roots collected from four sites at different altitudes. Material and methods The berberine content in different extracts of T. foliolosum roots collected from various altitudes was estimated using HPTLC. Total phenolic and flavonoid contents were determined using Folin-Ciocalteau reagent and aluminum chloride method respectively. The sensitivity of microbes for the extracts was studied using disc diffusion and the MIC was estimated using broth dilution method. Antioxidant capacity of the plant was studied using β-carotene bleaching assay, lipid peroxidation assay using goat liver, reducing power assay and DPPH free radical scavenging activity. Results Berberine content varied inversely with altitude; while phenol and flavonoid content of TF increased at higher altitudes. All the TF extracts showed moderate to high activity against Candida albicans, Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa. Extracts with high berberine content were most effective against C. albicans and S. aureus and also showed relatively significant anti-lipid peroxidation, β-carotene bleaching and reducing power. TF extracts with higher phenol and flavonoid content showed better scavenging of DPPH free radicals. Berberine was used as a standard in all the antioxidant and antimicrobial experiments performed. Conclusion Thalictrum from lower elevations can be explored as an alternate source of berberine and the plant has high antioxidant and antimicrobial properties owing to its berberine content.
Collapse
Affiliation(s)
- Garima Pandey
- Pharmacognosy & Ethnopharmacology Division, CSIR- National Botanical Research Institute, Lucknow- Post Box No. 436, Rana Pratap Marg, Lucknow, 226001, India.
| | - Sayyada Khatoon
- Pharmacognosy & Ethnopharmacology Division, CSIR- National Botanical Research Institute, Lucknow- Post Box No. 436, Rana Pratap Marg, Lucknow, 226001, India
| | - M M Pandey
- Pharmacognosy & Ethnopharmacology Division, CSIR- National Botanical Research Institute, Lucknow- Post Box No. 436, Rana Pratap Marg, Lucknow, 226001, India
| | - A K S Rawat
- Pharmacognosy & Ethnopharmacology Division, CSIR- National Botanical Research Institute, Lucknow- Post Box No. 436, Rana Pratap Marg, Lucknow, 226001, India
| |
Collapse
|
227
|
Assessment and modelling of antibacterial combination regimens. Clin Microbiol Infect 2018; 24:689-696. [DOI: 10.1016/j.cmi.2017.12.004] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2017] [Revised: 11/30/2017] [Accepted: 12/07/2017] [Indexed: 12/11/2022]
|
228
|
Rudilla H, Merlos A, Sans-Serramitjana E, Fusté E, Sierra JM, Zalacaín A, Vinuesa T, Viñas M. New and old tools to evaluate new antimicrobial peptides. AIMS Microbiol 2018; 4:522-540. [PMID: 31294231 PMCID: PMC6604946 DOI: 10.3934/microbiol.2018.3.522] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2018] [Accepted: 06/24/2018] [Indexed: 12/16/2022] Open
Abstract
The emergence of antimicrobial resistance due to the overuse of antimicrobials together with the existence of naturally untreatable infections well demonstrates the need for new instruments to fight microbes. Antimicrobial peptides (AMPs) are a promising family of molecules in this regard, because they abundantly occur in nature and the results of preliminary studies of their clinical potential have been encouraging. However, further progress will benefit from the standardization of research methods to assess the antimicrobial properties of AMPs. Here we review the diverse methods used to study the antimicrobial power of AMPs and recommend a pathway to explore new molecules. The use of new methodologies to quantitatively evaluate the physical effect on bacterial biofilms such as force spectroscopy and surface cell damage evaluation, constitute novel approaches to study new AMPs.
Collapse
Affiliation(s)
- Hector Rudilla
- Department of Pathology & Experimental therapeutics, Faculty of Medicine & Health Sciences, University of Barcelona, Feixa Llarga s/n 08907 Hospitalet, Barcelona, Spain
| | - Alexandra Merlos
- Department of Pathology & Experimental therapeutics, Faculty of Medicine & Health Sciences, University of Barcelona, Feixa Llarga s/n 08907 Hospitalet, Barcelona, Spain
| | - Eulàlia Sans-Serramitjana
- Department of Pathology & Experimental therapeutics, Faculty of Medicine & Health Sciences, University of Barcelona, Feixa Llarga s/n 08907 Hospitalet, Barcelona, Spain
| | - Ester Fusté
- Department of Pathology & Experimental therapeutics, Faculty of Medicine & Health Sciences, University of Barcelona, Feixa Llarga s/n 08907 Hospitalet, Barcelona, Spain
| | - Josep M Sierra
- Department of Pathology & Experimental therapeutics, Faculty of Medicine & Health Sciences, University of Barcelona, Feixa Llarga s/n 08907 Hospitalet, Barcelona, Spain
| | - Antonio Zalacaín
- Department of Clinical Sciences, Faculty of Medicine & Health Sciences, University of Barcelona, Feixa Llarga s/n 08907 Hospitalet, Barcelona, Spain
| | - Teresa Vinuesa
- Department of Pathology & Experimental therapeutics, Faculty of Medicine & Health Sciences, University of Barcelona, Feixa Llarga s/n 08907 Hospitalet, Barcelona, Spain
| | - Miguel Viñas
- Department of Pathology & Experimental therapeutics, Faculty of Medicine & Health Sciences, University of Barcelona, Feixa Llarga s/n 08907 Hospitalet, Barcelona, Spain
| |
Collapse
|
229
|
Soliman DH, Eldehna WM, Ghabbour HA, Kabil MM, Abdel-Aziz MM, Abdel-Aziz HAK. Novel 6-Phenylnicotinohydrazide Derivatives: Design, Synthesis and Biological Evaluation as a Novel Class of Antitubercular and Antimicrobial Agents. Biol Pharm Bull 2018; 40:1883-1893. [PMID: 29093335 DOI: 10.1248/bpb.b17-00361] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
In our ongoing efforts to develop potent antitubercular agents based on the 6-phenylnicotinohydrazide, herein we report the design, synthesis and biological evaluation of three sets of 6-phenylnicotinohydrazide derivatives 8a-g, 12 and 16a, b. The designed compounds were synthesized and in vitro evaluated for their antitubercular activity. In addition, their antifungal and antibacterial activities were evaluated as well. The nicotinohydrazide class displayed different levels of antimicrobial activity and possessed a distinctive pattern of selectivity against the tested microorganisms. However, the 2,6-dichlorobenzylidene counterpart 8b emerged as the most active one in this study, with superior antimycobacterial activity (minimum inhibitory concentration (MIC)=3.90 µg/mL) and potent broad-spectrum antimicrobial activities with MIC range of 0.24-1.95 µg/mL. The structure-activity relationship for such nicotinohydrazides has been established. Further, the cytotoxicity of the most active antitubercular compounds 8b, d and g were tested against the normal breast cells WI-38; none of them displayed significant cytotoxic effect, thereby providing a good therapeutic index.
Collapse
Affiliation(s)
- Dalia Hussein Soliman
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Egyptian Russian University.,Pharmaceutical Chemistry Department, Faculty of Pharmacy (Girls), Al-Azhar University
| | - Wagdy Mohamed Eldehna
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Kafrelsheikh University
| | - Hazem Ahmed Ghabbour
- Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University.,Department of Medicinal Chemistry, Faculty of Pharmacy, Mansoura University
| | | | | | | |
Collapse
|
230
|
Harnisz M, Korzeniewska E. The prevalence of multidrug-resistant Aeromonas spp. in the municipal wastewater system and their dissemination in the environment. THE SCIENCE OF THE TOTAL ENVIRONMENT 2018; 626:377-383. [PMID: 29353783 DOI: 10.1016/j.scitotenv.2018.01.100] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2017] [Revised: 01/11/2018] [Accepted: 01/11/2018] [Indexed: 06/07/2023]
Abstract
The objective of this study was to identify the determinants of antibiotic resistance and virulence of Aeromonas spp. isolated from treated wastewater (WW) and from samples of river water collected upstream (URW) and downstream (DRW) from the effluent discharge point. The resistance of Aeromonas spp. to antibiotics that are widely used in human and veterinary medicine, including beta-lactams, tetracyclines, glycylcyclines, fluoroquinolones, aminoglycosides and sulfamethoxazole-trimethoprim, was analyzed by disk diffusion method. The prevalence of hemolysins, aerolysins (virulence factors) and integrase genes was determined. A total of 83 Aeromonas spp. strains were selected from the isolates obtained from river water and wastewater samples. The highest percentage (81.8%) of multidrug-resistant isolates was noted in DRW samples. The analyzed isolates were most frequently resistant to beta-lactams, tetracyclines and aminoglycosides, whereas resistance to glycylcyclines was least common. Isolates resistant to beta-lactams most frequently harbored blaTEM and blaOXA genes. The group of genes encoding resistance to tetracyclines was most frequently represented by tet(E) and tet(O). Genes encoding virulence ahh1 (heat-labile hemolysin) or integrase intI1 occurred more frequently in the strains isolated from DRW than URW. An analysis of genetic relatedness revealed two main clusters - one with closely related WW and DRW isolates and one with less related isolates from all analyzed samples. The results of this study indicate that regardless of the applied treatment, municipal sewage may be a reservoir of antibiotic-resistant bacteria, antibiotic resistance and virulence genes and that treated water can contaminate other environmental domains.
Collapse
Affiliation(s)
- Monika Harnisz
- Department of Environmental Microbiology, Faculty of Environmental Sciences, University of Warmia and Mazury in Olsztyn, Prawocheńskiego 1, 10-720 Olsztyn, Poland.
| | - Ewa Korzeniewska
- Department of Environmental Microbiology, Faculty of Environmental Sciences, University of Warmia and Mazury in Olsztyn, Prawocheńskiego 1, 10-720 Olsztyn, Poland
| |
Collapse
|
231
|
Roth N, Mayrhofer S, Gierus M, Weingut C, Schwarz C, Doupovec B, Berrios R, Domig KJ. Effect of an organic acids based feed additive and enrofloxacin on the prevalence of antibiotic-resistant E. coli in cecum of broilers. Poult Sci 2018; 96:4053-4060. [PMID: 29050428 DOI: 10.3382/ps/pex232] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2017] [Accepted: 08/16/2017] [Indexed: 11/20/2022] Open
Abstract
Increasing antibiotic resistance is a major public health concern. Fluoroquinolones are used to treat and prevent poultry diseases worldwide. Fluoroquinolone resistance rates are high in their countries of use. The aim of this study was to evaluate the effect of an acids-based feed additive, as well as fluoroquinolone antibiotics, on the prevalence of antibiotic-resistant E. coli. A total of 480 broiler chickens (Ross 308) were randomly assigned to 3 treatments: a control group receiving a basal diet; a group receiving a feed additive (FA) based on formic acid, acetic acid and propionic acid; and an antibiotic enrofloxacin (AB) group given the same diet, but supplemented with enrofloxacin in water. A pooled fecal sample of one-day-old chicks was collected upon arrival at the experimental farm. On d 17 and d 38 of the trial, cecal samples from each of the 8 pens were taken, and the count of E. coli and antibiotic-resistant E. coli was determined.The results of the present study show a high prevalence of antibiotic-resistant E. coli in one-day-old chicks. Supplementation of the diet with FA and treatment of broilers with AB did not have a significant influence on the total number of E. coli in the cecal content on d 17 and d 38 of the trial. Supplementation with FA contributed to better growth performance and to a significant decrease (P ≤ 0.05) in E. coli resistant to ampicillin and tetracycline compared to the control and AB groups, as well as to a decrease (P ≤ 0.05) in sulfamethoxazole and ciprofloxacin-resistant E. coli compared to the AB group. Treatment with AB increased (P ≤ 0.05) the average daily weight compared to the control group and increased (P ≤ 0.05) the number of E. coli resistant to ciprofloxacin, streptomycin, sulfamethoxazole and tetracycline; it also decreased (P ≤ 0.05) the number of E. coli resistant to cefotaxime and extended spectrum beta-lactamase- (ESBL-) producing E. coli in the ceca of broilers.
Collapse
Affiliation(s)
- Nataliya Roth
- Department of Food Science and Technology, Institute of Food Science, BOKU - University of Natural Resources and Life Sciences, Vienna, Austria
| | - Sigrid Mayrhofer
- Department of Food Science and Technology, Institute of Food Science, BOKU - University of Natural Resources and Life Sciences, Vienna, Austria
| | - Martin Gierus
- Department of Agrobiotechnology, Institute of Animal Nutrition, Livestock Products, and Nutrition Physiology, BOKU - University of Natural Resources and Life Sciences, Vienna, Austria
| | - Christine Weingut
- Department of Food Science and Technology, Institute of Food Science, BOKU - University of Natural Resources and Life Sciences, Vienna, Austria
| | - Christiane Schwarz
- Department of Agrobiotechnology, Institute of Animal Nutrition, Livestock Products, and Nutrition Physiology, BOKU - University of Natural Resources and Life Sciences, Vienna, Austria
| | | | | | - Konrad J Domig
- Department of Food Science and Technology, Institute of Food Science, BOKU - University of Natural Resources and Life Sciences, Vienna, Austria
| |
Collapse
|
232
|
Conjugates and nano-delivery of antimicrobial peptides for enhancing therapeutic activity. J Drug Deliv Sci Technol 2018. [DOI: 10.1016/j.jddst.2017.12.010] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
|
233
|
Pérez V, Dorador C, Molina V, Yáñez C, Hengst M. Rhodobacter sp. Rb3, an aerobic anoxygenic phototroph which thrives in the polyextreme ecosystem of the Salar de Huasco, in the Chilean Altiplano. Antonie van Leeuwenhoek 2018; 111:1449-1465. [PMID: 29569108 DOI: 10.1007/s10482-018-1067-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Accepted: 03/16/2018] [Indexed: 10/17/2022]
Abstract
The Salar de Huasco is an evaporitic basin located in the Chilean Altiplano, which presents extreme environmental conditions for life, i.e. high altitude (3800 m.a.s.l.), negative water balance, a wide salinity range, high daily temperature changes and the occurrence of the highest registered solar radiation on the planet (> 1200 W m-2). This ecosystem is considered as a natural laboratory to understand different adaptations of microorganisms to extreme conditions. Rhodobacter, an anoxygenic aerobic phototrophic bacterial genus, represents one of the most abundant groups reported based on taxonomic diversity surveys in this ecosystem. The bacterial mat isolate Rhodobacter sp. strain Rb3 was used to study adaptation mechanisms to stress-inducing factors potentially explaining its success in a polyextreme ecosystem. We found that the Rhodobacter sp. Rb3 genome was characterized by a high abundance of genes involved in stress tolerance and adaptation strategies, among which DNA repair and oxidative stress were the most conspicuous. Moreover, many other molecular mechanisms associated with oxidative stress, photooxidation and antioxidants; DNA repair and protection; motility, chemotaxis and biofilm synthesis; osmotic stress, metal, metalloid and toxic anions resistance; antimicrobial resistance and multidrug pumps; sporulation; cold shock and heat shock stress; mobile genetic elements and toxin-antitoxin system were detected and identified as potential survival mechanism features in Rhodobacter sp. Rb3. In total, these results reveal a wide set of strategies used by the isolate to adapt and thrive under environmental stress conditions as a model of polyextreme environmental resistome.
Collapse
Affiliation(s)
- Vilma Pérez
- Laboratory of Molecular Ecology and Applied Microbiology, Departamento de Ciencias Farmacéuticas, Universidad Católica del Norte, Antofagasta, Chile.,Centre for Biotechnology & Bioengineering (CeBiB), Santiago, Chile
| | - Cristina Dorador
- Centre for Biotechnology & Bioengineering (CeBiB), Santiago, Chile.,Laboratorio de Complejidad Microbiana y Ecología Funcional, Instituto Antofagasta & Departamento de Biotecnología, Universidad de Antofagasta, Antofagasta, Chile
| | - Verónica Molina
- Departamento de Biología, Facultad de Ciencias Naturales y Exactas, Universidad de Playa Ancha, Valparaiso, Chile
| | - Carolina Yáñez
- Laboratorio Microbiología, Instituto de Biología, Facultad de Ciencias, Pontificia Universidad Católica de Valparaíso, Valparaiso, Chile
| | - Martha Hengst
- Laboratory of Molecular Ecology and Applied Microbiology, Departamento de Ciencias Farmacéuticas, Universidad Católica del Norte, Antofagasta, Chile. .,Centre for Biotechnology & Bioengineering (CeBiB), Santiago, Chile.
| |
Collapse
|
234
|
Kar S, Mishra RK, Pathak A, Dikshit A, Golakoti NR. In silico modeling and synthesis of phenyl and thienyl analogs of chalcones for potential leads as anti-bacterial agents. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2017.12.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
|
235
|
Evolutionary stability of antibiotic protection in a defensive symbiosis. Proc Natl Acad Sci U S A 2018; 115:E2020-E2029. [PMID: 29444867 DOI: 10.1073/pnas.1719797115] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
The increasing resistance of human pathogens severely limits the efficacy of antibiotics in medicine, yet many animals, including solitary beewolf wasps, successfully engage in defensive alliances with antibiotic-producing bacteria for millions of years. Here, we report on the in situ production of 49 derivatives belonging to three antibiotic compound classes (45 piericidin derivatives, 3 streptochlorin derivatives, and nigericin) by the symbionts of 25 beewolf host species and subspecies, spanning 68 million years of evolution. Despite a high degree of qualitative stability in the antibiotic mixture, we found consistent quantitative differences between species and across geographic localities, presumably reflecting adaptations to combat local pathogen communities. Antimicrobial bioassays with the three main components and in silico predictions based on the structure and specificity in polyketide synthase domains of the piericidin biosynthesis gene cluster yield insights into the mechanistic basis and ecoevolutionary implications of producing a complex mixture of antimicrobial compounds in a natural setting.
Collapse
|
236
|
Jia Z, Sukker I, Müller M, Schönherr H. Selective Discrimination of Key Enzymes of Pathogenic and Nonpathogenic Bacteria on Autonomously Reporting Shape-Encoded Hydrogel Patterns. ACS APPLIED MATERIALS & INTERFACES 2018; 10:5175-5184. [PMID: 29345895 DOI: 10.1021/acsami.7b15147] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
This work reports on a new approach to rapidly and selectively detect and discriminate enzymes of pathogenic from those of nonpathogenic bacteria using a patterned autonomously reporting hydrogel on a transparent support, in which the selectivity has been encoded by the pattern shape to enable facile detection by a color change at one single wavelength. In particular, enzyme-responsive chitosan hydrogel layers that report the presence of the enzymes β-glucuronidase (β-Gus) and β-galactosidase (β-Gal), produced by the nonvirulent Escherichia coli K12 and the food-borne biosafety level 3 pathogen enterohemorrhagic E. coli, respectively, via the blue color of an indigo dye were patterned by two complementary strategies. The comparison of the functionalization of patterned chitosan patches on a solid support with two chromogenic substrates on one hand and the area-selective conjugation of the substrates on the other hand showed that the two characteristic enzymes could indeed be rapidly and selectively discriminated. The limits of detection of the highly stable sensing layers for an observation time of 60 min using a spectrophotometer correspond to enzyme concentrations of β-Gus and β-Gal of ≤5 and ≤3 nM, respectively, and to ≤62 and ≤33 nM for bare eye detection in nonoptimized sensor patches. These results confirm the applicability of this approach, which is compatible with the simple measurement of optical density at one single wavelength only as well as with parallel, multiplexed detection, to differentiate the enzymes secreted by a highly pathogenic E. coli from a nonpathogenic E. coli on the basis of specifically secreted enzymes. Hence, a general approach for the rapid and selective detection of enzymes of different bacterial species for potential applications in food safety as well as point-of-care microbiological diagnostics is described.
Collapse
Affiliation(s)
- Zhiyuan Jia
- Physical Chemistry I & Research Center of Micro and Nanochemistry and Engineering (Cμ), Department of Chemistry and Biology, University of Siegen , Adolf-Reichwein-Straße 2, 57076 Siegen, Germany
| | - Issa Sukker
- Physical Chemistry I & Research Center of Micro and Nanochemistry and Engineering (Cμ), Department of Chemistry and Biology, University of Siegen , Adolf-Reichwein-Straße 2, 57076 Siegen, Germany
| | - Mareike Müller
- Physical Chemistry I & Research Center of Micro and Nanochemistry and Engineering (Cμ), Department of Chemistry and Biology, University of Siegen , Adolf-Reichwein-Straße 2, 57076 Siegen, Germany
| | - Holger Schönherr
- Physical Chemistry I & Research Center of Micro and Nanochemistry and Engineering (Cμ), Department of Chemistry and Biology, University of Siegen , Adolf-Reichwein-Straße 2, 57076 Siegen, Germany
| |
Collapse
|
237
|
Saleem H, Maryam A, Bokhari SA, Ashiq A, Rauf SA, Khalid RR, Qureshi FA, Siddiqi AR. Design, synthesis, characterization and computational docking studies of novel sulfonamide derivatives. EXCLI JOURNAL 2018; 17:169-180. [PMID: 29743855 PMCID: PMC5938533 DOI: 10.17179/excli2017-886] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/17/2017] [Accepted: 01/29/2018] [Indexed: 12/20/2022]
Abstract
This study reports three novel sulfonamide derivatives 4-Chloro-N-[(4-methylphenyl) sulphonyl]-N-propyl benzamide (1A), N-(2-hydroxyphenyl)-4-methyl benzene sulfonamide (1B) and 4-methyl-N-(2-nitrophenyl) benzene sulfonamide (1C). The compounds were synthesised from starting material 4-methylbenzenesulfonyl chloride and their structure was studied through 1H-NMR and 13C-NMR spectra. Computational docking was performed to estimate their binding energy against bacterial p-amino benzoic acid (PABA) receptor, the dihydropteroate synthase (DHPS). The derivatives were tested in vitro for their antimicrobial activity against Gram+ and Gram- bacteria including E. coli, B. subtilis, B. licheniformis and B. linen. 1A was found active only against B. linen; 1B was effective against E. coli, B. subtilis and B. linen whereas 1C showed activity against E. coli, B. licheniformis and B. linen. 1C showed maximum activity with minimum inhibitory concentration (MIC) of 50, 100 and 150 µg/mL against E. coli, B. licheniformis and B. linen respectively. 1C exhibited maximum affinity to DHPS with binding free energy of -8.1 kcal/mol. It enriched in the top 0.5 % of a library of 7663 compounds, ranked in order of their binding affinity against DHPS. 1C was followed by 1B which showed a moderate to low level MIC of 100, 250 and 150 µg/mL against E. coli, B. subtilis and B. linen respectively, whereas 1A showed a moderate level MIC of 100 µg/mL but only against B. linen. These derivatives may thus serve as potential anti-bacterial alternatives against resistant pathogens.
Collapse
Affiliation(s)
- Hira Saleem
- Department of Biosciences, COMSATS Institute of Information Technology, Islamabad, Pakistan
| | - Arooma Maryam
- Department of Biosciences, COMSATS Institute of Information Technology, Islamabad, Pakistan
| | - Saleem Ahmed Bokhari
- Department of Biosciences, COMSATS Institute of Information Technology, Islamabad, Pakistan
| | - Ayesha Ashiq
- Department of Biosciences, COMSATS Institute of Information Technology, Islamabad, Pakistan
| | - Sadaf Abdul Rauf
- Department of Computer Science, Fatima Jinnah Women University, The Mall, Rawalpindi
| | - Rana Rehan Khalid
- Department of Biosciences, COMSATS Institute of Information Technology, Islamabad, Pakistan
| | - Fahim Ashraf Qureshi
- Department of Biosciences, COMSATS Institute of Information Technology, Islamabad, Pakistan
| | - Abdul Rauf Siddiqi
- Department of Biosciences, COMSATS Institute of Information Technology, Islamabad, Pakistan
| |
Collapse
|
238
|
Arias-Sánchez FI, Allen RC, Hall AR. Effects of prior exposure to antibiotics on bacterial adaptation to phages. J Evol Biol 2017; 31:277-286. [PMID: 29218855 DOI: 10.1111/jeb.13220] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2017] [Accepted: 11/30/2017] [Indexed: 11/27/2022]
Abstract
Understanding adaptation to complex environments requires information about how exposure to one selection pressure affects adaptation to others. For bacteria, antibiotics and viral parasites (phages) are two of the most common selection pressures and are both relevant for treatment of bacterial infections: increasing antibiotic resistance is generating significant interest in using phages in addition or as an alternative to antibiotics. However, we lack knowledge of how exposure to antibiotics affects bacterial responses to phages. Specifically, it is unclear how the negative effects of antibiotics on bacterial population growth combine with any possible mutagenic effects or physiological responses to influence adaptation to other stressors such as phages, and how this net effect varies with antibiotic concentration. Here, we experimentally addressed the effect of pre-exposure to a wide range of antibiotic concentrations on bacterial responses to phages. Across 10 antibiotics, we found a strong association between their effects on bacterial population size and subsequent population growth in the presence of phages (which in these conditions indicates phage-resistance evolution). We detected some evidence of mutagenesis among populations treated with fluoroquinolones and β-lactams at sublethal doses, but these effects were small and not consistent across phage treatments. These results show that, although stressors such as antibiotics can boost adaptation to other stressors at low concentrations, these effects are weak compared to the effect of reduced population growth at inhibitory concentrations, which in our experiments strongly reduced the likelihood of subsequent phage-resistance evolution.
Collapse
Affiliation(s)
| | - R C Allen
- Institute of Integrative Biology, ETH Zürich, Zürich, Switzerland
| | - A R Hall
- Institute of Integrative Biology, ETH Zürich, Zürich, Switzerland
| |
Collapse
|
239
|
Garbisu C, Garaiyurrebaso O, Epelde L, Grohmann E, Alkorta I. Plasmid-Mediated Bioaugmentation for the Bioremediation of Contaminated Soils. Front Microbiol 2017; 8:1966. [PMID: 29062312 PMCID: PMC5640721 DOI: 10.3389/fmicb.2017.01966] [Citation(s) in RCA: 57] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2017] [Accepted: 09/25/2017] [Indexed: 11/29/2022] Open
Abstract
Bioaugmentation, or the inoculation of microorganisms (e.g., bacteria harboring the required catabolic genes) into soil to enhance the rate of contaminant degradation, has great potential for the bioremediation of soils contaminated with organic compounds. Regrettably, cell bioaugmentation frequently turns into an unsuccessful initiative, owing to the rapid decrease of bacterial viability and abundance after inoculation, as well as the limited dispersal of the inoculated bacteria in the soil matrix. Genes that encode the degradation of organic compounds are often located on plasmids and, consequently, they can be spread by horizontal gene transfer into well-established, ecologically competitive, indigenous bacterial populations. Plasmid-mediated bioaugmentation aims to stimulate the spread of contaminant degradation genes among indigenous soil bacteria by the introduction of plasmids, located in donor cells, harboring such genes. But the acquisition of plasmids by recipient cells can affect the host’s fitness, a crucial aspect for the success of plasmid-mediated bioaugmentation. Besides, environmental factors (e.g., soil moisture, temperature, organic matter content) can play important roles for the transfer efficiency of catabolic plasmids, the expression of horizontally acquired genes and, finally, the contaminant degradation activity. For plasmid-mediated bioaugmentation to be reproducible, much more research is needed for a better selection of donor bacterial strains and accompanying plasmids, together with an in-depth understanding of indigenous soil bacterial populations and the environmental conditions that affect plasmid acquisition and the expression and functioning of the catabolic genes of interest.
Collapse
Affiliation(s)
- Carlos Garbisu
- Soil Microbial Ecology Group, Department of Conservation of Natural Resources, Neiker Tecnalia, Derio, Spain
| | - Olatz Garaiyurrebaso
- Instituto Biofisika (UPV/EHU, CSIC), Department of Biochemistry and Molecular Biology, University of the Basque Country, Bilbao, Spain
| | - Lur Epelde
- Soil Microbial Ecology Group, Department of Conservation of Natural Resources, Neiker Tecnalia, Derio, Spain
| | | | - Itziar Alkorta
- Soil Microbial Ecology Group, Department of Conservation of Natural Resources, Neiker Tecnalia, Derio, Spain
| |
Collapse
|
240
|
Sharaha U, Rodriguez-Diaz E, Riesenberg K, Bigio IJ, Huleihel M, Salman A. Using Infrared Spectroscopy and Multivariate Analysis to Detect Antibiotics' Resistant Escherichia coli Bacteria. Anal Chem 2017; 89:8782-8790. [PMID: 28731324 DOI: 10.1021/acs.analchem.7b01025] [Citation(s) in RCA: 63] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Bacterial pathogens are one of the primary causes of human morbidity worldwide. Historically, antibiotics have been highly effective against most bacterial pathogens; however, the increasing resistance of bacteria to a broad spectrum of commonly used antibiotics has become a global health-care problem. Early and rapid determination of bacterial susceptibility to antibiotics has become essential in many clinical settings and, sometimes, can save lives. Currently classical procedures require at least 48 h for determining bacterial susceptibility, which can constitute a life-threatening delay for effective treatment. Infrared (IR) microscopy is a rapid and inexpensive technique, which has been used successfully for the detection and identification of various biological samples; nonetheless, its true potential in routine clinical diagnosis has not yet been established. In this study, we evaluated the potential of this technique for rapid identification of bacterial susceptibility to specific antibiotics based on the IR spectra of the bacteria. IR spectroscopy was conducted on bacterial colonies, obtained after 24 h culture from patients' samples. An IR microscope was utilized, and a computational classification method was developed to analyze the IR spectra by novel pattern-recognition and statistical tools, to determine E. coli susceptibility within a few minutes to different antibiotics, gentamicin, ceftazidime, nitrofurantoin, nalidixic acid, ofloxacin. Our results show that it was possible to classify the tested bacteria into sensitive and resistant types, with success rates as high as 85% for a number of examined antibiotics. These promising results open the potential of this technique for faster determination of bacterial susceptibility to certain antibiotics.
Collapse
Affiliation(s)
- Uraib Sharaha
- Department of Microbiology, Immunology and Genetics, Ben-Gurion University of the Negev , Beer-Sheva 84105, Israel
| | - Eladio Rodriguez-Diaz
- Department of Medicine, Section of Gastroenterology, Boston University School of Medicine , Boston, Massachusetts 02118, United States.,USA 2 Section of Gastroenterology, VA Boston Healthcare System , Boston, Massachusetts 02130, United States
| | | | - Irving J Bigio
- Department of Biomedical Engineering, Boston University , Boston, Massachusetts 02215, United States.,Department of Electrical & Computer Engineering, Boston University , Boston, Massachusetts 02215, United States
| | - Mahmoud Huleihel
- Department of Microbiology, Immunology and Genetics, Ben-Gurion University of the Negev , Beer-Sheva 84105, Israel
| | - Ahmad Salman
- Department of Physics, SCE-Shamoon College of Engineering , Beer-Sheva 84100, Israel
| |
Collapse
|
241
|
Araújo BF, Campos PAD, Royer S, Ferreira ML, Gonçalves IR, Batistão DWDF, Resende DS, Brito CSD, Gontijo-Filho PP, Ribas RM. High frequency of the combined presence of QRDR mutations and PMQR determinants in multidrug-resistant Klebsiella pneumoniae and Escherichia coli isolates from nosocomial and community-acquired infections. J Med Microbiol 2017; 66:1144-1150. [PMID: 28771139 DOI: 10.1099/jmm.0.000551] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Plasmid-mediated quinolone resistance (PMQR) determinants combined with mutations in quinolone resistance-determining regions (QRDRs) and clonal dissemination were investigated in 40 fluoroquinolone-resistant Klebsiella pneumoniae and Escherichia coli isolates from nosocomial and community-acquired infections. We observed nucleotide substitutions in gyrA (Ser83Ile, Val37Leu, Lys154Arg, Ser171Ala, Ser19Asn, Ile198Val, Ser83Tyr, Ser83Leu, Asp87Asn and Asp87Gly) and parC genes (Ser80Ile, Glu84Lys, Ala129Ser, Val141Ala and Glu84Gly). Two novel substitutions were detected in the gyrA gene (Val37Leu and Ile198Val). The presence of PMQR genes predominated in community isolates (55.5 %). In addition to the frequent presence of the class 1 integron in isolates from community-acquired infections, the genetic similarity results obtained by PFGE showed high genomic diversity. This study suggests that management of multidrug-resistant Enterobacteriaceae isolates from the community are a possible source of genetic mobile elements that carry genes that confer resistance to fluoroquinolones. More attention should be paid to the surveillance of community-acquired infections.
Collapse
Affiliation(s)
- Bruna Fuga Araújo
- Institute of Biomedical Sciences (ICBIM), Laboratory of Molecular Microbiology, Federal University of Uberlandia, Uberlandia, Minas Gerais, Brazil
| | - Paola Amaral de Campos
- Institute of Biomedical Sciences (ICBIM), Laboratory of Molecular Microbiology, Federal University of Uberlandia, Uberlandia, Minas Gerais, Brazil
| | - Sabrina Royer
- Institute of Biomedical Sciences (ICBIM), Laboratory of Molecular Microbiology, Federal University of Uberlandia, Uberlandia, Minas Gerais, Brazil
| | - Melina Lorraine Ferreira
- Institute of Biomedical Sciences (ICBIM), Laboratory of Molecular Microbiology, Federal University of Uberlandia, Uberlandia, Minas Gerais, Brazil
| | - Iara Rossi Gonçalves
- Institute of Biomedical Sciences (ICBIM), Laboratory of Molecular Microbiology, Federal University of Uberlandia, Uberlandia, Minas Gerais, Brazil
| | | | | | - Cristiane Silveira de Brito
- Institute of Biomedical Sciences (ICBIM), Laboratory of Molecular Microbiology, Federal University of Uberlandia, Uberlandia, Minas Gerais, Brazil
| | - Paulo Pinto Gontijo-Filho
- Institute of Biomedical Sciences (ICBIM), Laboratory of Molecular Microbiology, Federal University of Uberlandia, Uberlandia, Minas Gerais, Brazil
| | - Rosineide Marques Ribas
- Institute of Biomedical Sciences (ICBIM), Laboratory of Molecular Microbiology, Federal University of Uberlandia, Uberlandia, Minas Gerais, Brazil
| |
Collapse
|
242
|
Ray S, Maitra A, Biswas A, Panjikar S, Mondal J, Anand R. Functional insights into the mode of DNA and ligand binding of the TetR family regulator TylP from Streptomyces fradiae. J Biol Chem 2017; 292:15301-15311. [PMID: 28739805 DOI: 10.1074/jbc.m117.788000] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2017] [Revised: 07/21/2017] [Indexed: 01/18/2023] Open
Abstract
Tetracycline repressors (TetRs) modulate multidrug efflux pathways in several pathogenic bacteria. In Streptomyces, they additionally regulate secondary metabolic pathways like antibiotic production. For instance, in the antibiotic producer Streptomyces fradiae, a layered network of TetRs regulates the levels of the commercially important antibiotic tylosin, with TylP occupying the top of this cascading network. TetRs exist in two functional states, the DNA-bound and the ligand-bound form, which are allosterically regulated. Here, to develop deeper insights into the factors that govern allostery, the crystal structure of TylP was solved to a resolution of 2.3 Å. The structure revealed that TylP possesses several unique features; notably, it harbors a unique C-terminal helix-loop extension that spans the entire length of the structure. This anchor connects the DNA-binding domain (DBD) with the ligand-binding domain (LBD) via a mix of positively charged and hydrogen-bonding interactions. Supporting EMSA studies with a series of ΔC truncated versions show that a systematic deletion of this region results in complete loss of DNA binding. The structure additionally revealed that TylP is markedly different in the orientation of its DBD and LBD architecture and the dimeric geometry from its hypothesized Streptomyces homologue CprB, which is a γ-butyrolactone regulator. Rather, TylP is closer in structural design to macrolide-binding TetRs found in pathogens. Supporting molecular dynamic studies suggested that TylP binds a macrolide intermediate in the tylosin pathway. Collectively, the structure along with corroborating biochemical studies provided insights into the novel mode of regulation of TetRs in antibiotic-producing organisms.
Collapse
Affiliation(s)
- Shamayeeta Ray
- From the Department of Chemistry, Indian Institute of Technology Bombay, Mumbai-400076, India.,the IITB-Monash Research Academy, Mumbai-400076, India
| | - Anwesha Maitra
- From the Department of Chemistry, Indian Institute of Technology Bombay, Mumbai-400076, India
| | - Anwesha Biswas
- From the Department of Chemistry, Indian Institute of Technology Bombay, Mumbai-400076, India
| | - Santosh Panjikar
- the Department of Biochemistry and Molecular Biology, Monash University, Victoria 3800, Australia.,the Australian Synchrotron, Victoria 3168, Australia, and
| | - Jagannath Mondal
- the Tata Institute of Fundamental Research (TIFR) Centre for Interdisciplinary Sciences, Hyderabad-500075, India
| | - Ruchi Anand
- From the Department of Chemistry, Indian Institute of Technology Bombay, Mumbai-400076, India,
| |
Collapse
|
243
|
Macromolecular Conjugate and Biological Carrier Approaches for the Targeted Delivery of Antibiotics. Antibiotics (Basel) 2017; 6:antibiotics6030014. [PMID: 28677631 PMCID: PMC5617978 DOI: 10.3390/antibiotics6030014] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2017] [Revised: 06/24/2017] [Accepted: 06/29/2017] [Indexed: 01/21/2023] Open
Abstract
For the past few decades, the rapid rise of antibiotic multidrug-resistance has presented a palpable threat to human health worldwide. Meanwhile, the number of novel antibiotics released to the market has been steadily declining. Therefore, it is imperative that we utilize innovative approaches for the development of antimicrobial therapies. This article will explore alternative strategies, namely drug conjugates and biological carriers for the targeted delivery of antibiotics, which are often eclipsed by their nanomedicine-based counterparts. A variety of macromolecules have been investigated as conjugate carriers, but only those most widely studied in the field of infectious diseases (e.g., proteins, peptides, antibodies) will be discussed in detail. For the latter group, blood cells, especially erythrocytes, have been successfully tested as homing carriers of antimicrobial agents. Bacteriophages have also been studied as a candidate for similar functions. Once these alternative strategies receive the amount of research interest and resources that would more accurately reflect their latent applicability, they will inevitably prove valuable in the perennial fight against antibiotic resistance.
Collapse
|
244
|
Antibacterial Activity of AI-Hemocidin 2, a Novel N-Terminal Peptide of Hemoglobin Purified from Arca inflata. Mar Drugs 2017; 15:md15070205. [PMID: 28661457 PMCID: PMC5532647 DOI: 10.3390/md15070205] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2017] [Revised: 06/25/2017] [Accepted: 06/27/2017] [Indexed: 01/01/2023] Open
Abstract
The continued emergence of antibiotic resistant bacteria in recent years is of great concern. The search for new classes of antibacterial agents has expanded to non-traditional sources such as shellfish. An antibacterial subunit of hemoglobin (Hb-I) was purified from the mantle of Arca inflata by phosphate extraction and ion exchange chromatography. A novel antibacterial peptide, AI-hemocidin 2, derived from Hb-I, was discovered using bioinformatics analysis. It displayed antibacterial activity across a broad spectrum of microorganisms, including several Gram-positive and Gram-negative bacteria, with minimal inhibitory concentration (MIC) values ranging from 37.5 to 300 μg/mL, and it exhibited minimal hemolytic or cytotoxic activities. The antibacterial activity of AI-hemocidin 2 was thermostable (25–100 °C) and pH resistant (pH 3–10). The cellular integrity was determined by flow cytometry. AI-hemocidin 2 was capable of permeating the cellular membrane. Changes in the cell morphology were observed with a scanning electron microscope. Circular dichroism spectra suggested that AI-hemocidin 2 formed an α-helix structure in the membrane mimetic environment. The results indicated that the anti-bacterial mechanism for AI-hemocidin 2 occurred through disrupting the cell membrane. AI-hemocidin 2 might be a potential candidate for tackling antibiotic resistant bacteria.
Collapse
|
245
|
Abstract
Widespread antibiotic resistance among bacterial pathogens is providing the impetus to explore novel sources of antimicrobial agents. Recently, the potent antibacterial activity of certain clay minerals has stimulated scientific interest in these materials. One such example is Kisameet glacial clay (KC), an antibacterial clay from a deposit on the central coast of British Columbia, Canada. However, our understanding of the active principles of these complex natural substances is incomplete. Like soils, clays may possess complex mixtures of bacterial taxa, including the Actinobacteria, a clade known to be rich in antibiotic-producing organisms. Here, we present the first characterization of both the microbial and geochemical characteristics of a glacial clay deposit. KC harbors surprising bacterial species richness, with at least three distinct community types. We show that the deposit has clines of inorganic elements that can be leached by pH, which may be drivers of community structure. We also note the prevalence of Gallionellaceae in samples recovered near the surface, as well as taxa that include medically or economically important bacteria such as Actinomycetes and Paenibacillus. These results provide insight into the microbial taxa that may be the source of KC antibacterial activity and suggest that natural clays may be rich sources of microbial and molecular diversity. Identifying and characterizing the resident microbial populations (bacteria, viruses, protozoa, and fungi) is key to understanding the ecology, chemistry, and homeostasis of virtually all sites on Earth. The Kisameet Bay deposit in British Columbia, Canada, holds a novel glacial clay with a history of medicinal use by local indigenous people. We previously showed that it has potent activity against a variety of antibiotic-resistant bacteria, suggesting it could complement our dwindling arsenal of antibiotics. Here, we have characterized the microbiome of this deposit to gain insight into what might make the clay antibacterial. Our analyses suggest that the deposit contains a surprising diversity of bacteria, which live in at least three distinct environments. In addition, the clay harbors bacteria that may have interesting potential as biocontrol/bioremediation agents or producers of novel bioactive compounds.
Collapse
|
246
|
Olsson S, Bonfante P, Pawlowska TE. Chapter 39 Ecology and Evolution of Fungal-Bacterial Interactions. Mycology 2017. [DOI: 10.1201/9781315119496-40] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
|
247
|
Renbarger TL, Baker JM, Sattley WM. Slow and steady wins the race: an examination of bacterial persistence. AIMS Microbiol 2017; 3:171-185. [PMID: 31294156 PMCID: PMC6605009 DOI: 10.3934/microbiol.2017.2.171] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2017] [Accepted: 03/21/2017] [Indexed: 12/02/2022] Open
Abstract
Bacterial persistence is a state of metabolic dormancy among a small fraction (<1%) of a genetically identical population of cells that, as a result, becomes transiently resistant to environmental stressors. Such cells, called persisters, are able to survive indeterminate periods of exposure to challenging and even hostile environmental conditions, including nutrient deprivation, oxidative stress, or the presence of an antibiotic to which the bacterium would normally be susceptible. Subpopulations of cells having the persister phenotype is also a common feature of biofilms, in which limited space, hypoxia, and nutrient deficiencies all contribute to the onset of persistence. Microbiologists have been aware of bacterial persistence since the early days of antibiotic development. However, in recent years the significance of this phenomenon has been brought into new focus, as persistent bacterial infections that require multiple rounds of antibiotic treatment are becoming a more widespread clinical challenge. Here, we provide an overview of the major features of bacterial persistence, including the various conditions that precipitate persister formation and a discussion of several of the better-characterized molecular mechanisms that trigger this distinctive mode of bacterial dormancy.
Collapse
Affiliation(s)
- Tara L Renbarger
- Division of Natural Sciences, Indiana Wesleyan University, Marion, Indiana 46953, USA
| | - Jennifer M Baker
- Division of Natural Sciences, Indiana Wesleyan University, Marion, Indiana 46953, USA
| | - W Matthew Sattley
- Division of Natural Sciences, Indiana Wesleyan University, Marion, Indiana 46953, USA
| |
Collapse
|
248
|
Antimicrobial susceptibility, virulence gene and pulsed-field gel electrophoresis profiles of Salmonella enterica serovar Typhimurium recovered from retail raw chickens, China. Food Control 2017. [DOI: 10.1016/j.foodcont.2016.07.032] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
249
|
Obimakinde S, Fatoki O, Opeolu B, Olatunji O. Veterinary pharmaceuticals in aqueous systems and associated effects: an update. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:3274-3297. [PMID: 27752951 DOI: 10.1007/s11356-016-7757-z] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2016] [Accepted: 09/20/2016] [Indexed: 06/06/2023]
Abstract
Environmental studies have shown that pharmaceuticals can contaminate aqueous matrices, such as groundwater, surface water, sediment as well as aquatic flora and fauna. Effluents from sewage and wastewater treatment plants, pharmaceutical industries and hospitals have been implicated in such contamination. Recent studies have however revealed significant concentrations of pharmaceuticals in wastewater from animal facilities in proximal aquatic habitats. Furthermore, epidemiological studies have shown a consistent positive correlation between exposure to some drugs of veterinary importance and increased adverse effects in aquatic biota largely due to induction of endocrine disruption, antibiotic resistance, neurotoxicity, genotoxicity and oxidative stress. The aquatic habitats and associated biota are important in the maintenance of global ecosystem and food chain. For this reason, anything that compromises the integrity and functions of the aquatic environment may lead to major upset in the world's ecosystems. Therefore, knowledge about this route of exposure cannot be neglected and monitoring of their occurrence in the environment is required. This review focuses on scientific evidence that link the presence of pharmaceuticals in aqueous matrices to animal production facilities and presents means to reduce the occurrence of veterinary pharmaceutical residues in the aquatic habitats.
Collapse
Affiliation(s)
- Samuel Obimakinde
- Department of Chemistry, Cape Peninsula University of Technology, Zonnebloem, Cape Town, 8000, South Africa.
| | - Olalekan Fatoki
- Department of Chemistry, Cape Peninsula University of Technology, Zonnebloem, Cape Town, 8000, South Africa
| | - Beatrice Opeolu
- Department of Environmental and Occupational Health, Cape Peninsula University of Technology, Zonnebloem, Cape Town, 8000, South Africa
| | - Olatunde Olatunji
- Department of Chemistry, Cape Peninsula University of Technology, Zonnebloem, Cape Town, 8000, South Africa
| |
Collapse
|
250
|
Rather IA, Kim BC, Bajpai VK, Park YH. Self-medication and antibiotic resistance: Crisis, current challenges, and prevention. Saudi J Biol Sci 2017; 24:808-812. [PMID: 28490950 PMCID: PMC5415144 DOI: 10.1016/j.sjbs.2017.01.004] [Citation(s) in RCA: 150] [Impact Index Per Article: 21.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2016] [Revised: 12/22/2016] [Accepted: 01/02/2017] [Indexed: 01/21/2023] Open
Abstract
The present study aims to explore the crisis of antibiotic resistance and discover more about the current challenges related to self-medication. The current challenges related to antibiotic resistance are unique and differ from the challenges of the past since new bacterial pathogens are involved and continue to evolve. Strains with resistance to multiple antibiotic classes have emerged which the discovery of new antibiotics has failed to match. The consequences of antibiotic resistance are grave with mortality and morbidity continually on the rise. This paper also highlights the possible interventions that can be effective at the micro or individual level in the prevention of development of antibiotic resistance.
Collapse
Affiliation(s)
- Irfan A Rather
- Department of Applied Microbiology and Biotechnology, School of Biotechnology, Yeungnam University, Gyeongsan, Gyeongbuk 38541, Republic of Korea
| | - Byung-Chun Kim
- Probionic Institute, Jeonju-si, Jeollabuk-do, Republic of Korea
| | - Vivek K Bajpai
- Department of Applied Microbiology and Biotechnology, School of Biotechnology, Yeungnam University, Gyeongsan, Gyeongbuk 38541, Republic of Korea
| | - Yong-Ha Park
- Department of Applied Microbiology and Biotechnology, School of Biotechnology, Yeungnam University, Gyeongsan, Gyeongbuk 38541, Republic of Korea.,Probionic Institute, Jeonju-si, Jeollabuk-do, Republic of Korea
| |
Collapse
|