1
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Gil-Gil T, Berryhill BA, Manuel JA, Smith AP, McCall IC, Baquero F, Levin BR. The Evolution of Heteroresistance via Small Colony Variants in Escherichia coli Following Long Term Exposure to Bacteriostatic Antibiotics. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2023.10.30.564761. [PMID: 37961139 PMCID: PMC10634941 DOI: 10.1101/2023.10.30.564761] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/15/2023]
Abstract
Traditionally, bacteriostatic antibiotics are agents able to arrest bacterial growth. Despite being traditionally viewed as unable to kill bacterial cells, when they are used clinically the outcome of these drugs is frequently as effective as when a bactericidal drug is used. We explore the dynamics of Escherichia coli after exposure to two ribosome-targeting bacteriostatic antibiotics, chloramphenicol and azithromycin, for thirty days. The results of our experiments provide evidence that bacteria exposed to these drugs replicate, evolve, and generate a sub-population of small colony variants (SCVs) which are resistant to multiple drugs. These SCVs contribute to the evolution of heteroresistance and rapidly revert to a susceptible state once the antibiotic is removed. Stated another way, exposure to bacteriostatic drugs selects for the evolution of heteroresistance in populations previously lacking this trait. More generally, our results question the definition of bacteriostasis as populations exposed to bacteriostatic drugs are replicating despite the lack of net growth.
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Affiliation(s)
- Teresa Gil-Gil
- Department of Biology, Emory University; Atlanta, Georgia, 30322, USA
| | - Brandon A. Berryhill
- Department of Biology, Emory University; Atlanta, Georgia, 30322, USA
- Program in Microbiology and Molecular Genetics, Graduate Division of Biological and Biomedical Sciences, Laney Graduate School, Emory University; Atlanta, GA, 30322, USA
| | - Joshua A. Manuel
- Department of Biology, Emory University; Atlanta, Georgia, 30322, USA
| | - Andrew P. Smith
- Department of Biology, Emory University; Atlanta, Georgia, 30322, USA
| | - Ingrid C. McCall
- Department of Biology, Emory University; Atlanta, Georgia, 30322, USA
| | - Fernando Baquero
- Hospital Universitario Ramón y Cajal, Instituto Ramón y Cajal de Investigación Sanitaria, and Centro de Investigación Médica en Red, Epidemiologíy Salud Pública (CIBERESP) Madrid, Spain
| | - Bruce R. Levin
- Department of Biology, Emory University; Atlanta, Georgia, 30322, USA
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2
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Delahaye A, Eldin C, Bleibtreu A, Djossou F, Marrie TJ, Ghanem-Zoubi N, Roeden S, Epelboin L. Treatment of persistent focalized Q fever: time has come for an international randomized controlled trial. J Antimicrob Chemother 2024:dkae145. [PMID: 38888195 DOI: 10.1093/jac/dkae145] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2023] [Accepted: 04/15/2024] [Indexed: 06/20/2024] Open
Abstract
Q fever is a worldwide zoonosis due to Coxiella burnetii, responsible for endocarditis and endovascular infections. Since the 1990s, the combination hydroxychloroquine + doxycycline has constituted the curative and prophylactic treatment in persistent focalized Q fever. This combination appears to have significantly reduced the treatment's duration (from 60 to 26 months), yet substantial evidence of effectiveness remains lacking. Data are mostly based on in vitro and observational studies. We conducted a literature review to assess the effectiveness of this therapy, along with potential alternatives. The proposed in vitro mechanism of action describes the inhibition of Coxiella replication by doxycycline through the restoration of its bactericidal activity (inhibited in acidic environment) by alkalinization of phagolysosome-like vacuoles with hydroxychloroquine. So far, the rarity and heterogeneous presentation of cases have made it challenging to design prospective studies with statistical power. The main studies supporting this treatment are retrospective cohorts, dating back to the 1990s-2000s. Retrospective studies from the large Dutch outbreak of Q fever (>4000 cases between 2007 and 2010) did not corroborate a clear benefit of this combination, notably in comparison with other regimens. Thus, there is still no consensus among the medical community on this issue. However insufficient the evidence, today the doxycycline + hydroxychloroquine combination remains the regimen with the largest clinical experience in the treatment of 'chronic' Q fever. Reinforcing the guidelines' level of evidence is critical. We herein propose the creation of an extensive international registry, followed by a prospective cohort or ideally a randomized controlled trial.
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Affiliation(s)
- Audrey Delahaye
- Department of Infectious and Tropical Diseases, Andrée Rosemon Hospital, Cayenne, French Guiana
| | - Carole Eldin
- UMR UVE, Aix Marseille University, IRD 190 Inserm, 1207 EFS-IRBA, Marseille, France
| | - Alexandre Bleibtreu
- Department of Infectious and Tropical Diseases, University Hospitals Pitié Salpêtrière-Charles Foix, AP-HP, Paris, France
| | - Félix Djossou
- Infectious Diseases Institute, Rambam Health Care Campus, Haifa, Israel
| | - Thomas J Marrie
- Faculty of Medicine, Dalhousie University, 1459 Oxford Street, Halifax, NS B3H 4R2, Canada
| | - Nesrin Ghanem-Zoubi
- Ruth and Bruce Rappaport Faculty of Medicine, Technion, Israel Institute of Technology, Haifa, Israel
| | - Sonja Roeden
- Internal Medicine and Dermatology, University Medical Centre Utrecht, Utrecht, The Netherlands
| | - Loïc Epelboin
- Department of Infectious and Tropical Diseases, Andrée Rosemon Hospital, Cayenne, French Guiana
- Clinical Investigation Center Antilles Guyane, Inserm 1424, Centre Hospitalier de Cayenne Andrée Rosemon, Cayenne, French Guiana
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3
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Amábile-Cuevas CF, Lund-Zaina S. Non-Canonical Aspects of Antibiotics and Antibiotic Resistance. Antibiotics (Basel) 2024; 13:565. [PMID: 38927231 PMCID: PMC11200725 DOI: 10.3390/antibiotics13060565] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2024] [Revised: 05/09/2024] [Accepted: 05/29/2024] [Indexed: 06/28/2024] Open
Abstract
The understanding of antibiotic resistance, one of the major health threats of our time, is mostly based on dated and incomplete notions, especially in clinical contexts. The "canonical" mechanisms of action and pharmacodynamics of antibiotics, as well as the methods used to assess their activity upon bacteria, have not changed in decades; the same applies to the definition, acquisition, selective pressures, and drivers of resistance. As a consequence, the strategies to improve antibiotic usage and overcome resistance have ultimately failed. This review gathers most of the "non-canonical" notions on antibiotics and resistance: from the alternative mechanisms of action of antibiotics and the limitations of susceptibility testing to the wide variety of selective pressures, lateral gene transfer mechanisms, ubiquity, and societal factors maintaining resistance. Only by having a "big picture" view of the problem can adequate strategies to harness resistance be devised. These strategies must be global, addressing the many aspects that drive the increasing prevalence of resistant bacteria aside from the clinical use of antibiotics.
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Affiliation(s)
| | - Sofia Lund-Zaina
- Department of Public Health, University of Southern Denmark, Campusvej 55, 5230 Odense, Denmark
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4
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Akinwale AD, Parang K, Tiwari RK, Yamaki J. Mechanistic Study of Antimicrobial Effectiveness of Cyclic Amphipathic Peptide [R 4W 4] against Methicillin-Resistant Staphylococcus aureus Clinical Isolates. Antibiotics (Basel) 2024; 13:555. [PMID: 38927221 PMCID: PMC11201061 DOI: 10.3390/antibiotics13060555] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2024] [Revised: 05/30/2024] [Accepted: 06/11/2024] [Indexed: 06/28/2024] Open
Abstract
Antimicrobial peptides (AMPs) are being explored as a potential strategy to combat antibiotic resistance due to their ability to reduce susceptibility to antibiotics. This study explored whether the [R4W4] peptide mode of action is bacteriostatic or bactericidal using modified two-fold serial dilution and evaluating the synergism between gentamicin and [R4W4] against Escherichia coli (E. coli) and methicillin-resistant Staphylococcus aureus (MRSA) by a checkered board assay. [R4W4] exhibited bactericidal activity against bacterial isolates (MBC/MIC ≤ 4), with a synergistic effect with gentamicin against E. coli (FICI = 0.3) but not against MRSA (FICI = 0.75). Moreover, we investigated the mechanism of action of [R4W4] against MRSA by applying biophysical assays to evaluate zeta potential, cytoplasmic membrane depolarization, and lipoteichoic acid (LTA) binding affinity. [R4W4] at a 16 mg/mL concentration stabilized the zeta potential of MRSA -31 ± 0.88 mV to -8.37 mV. Also, [R4W4] at 2 × MIC and 16 × MIC revealed a membrane perturbation process associated with concentration-dependent effects. Lastly, in the presence of BODIPY-TR-cadaverine (BC) fluorescence dyes, [R4W4] exhibited binding affinity to LTA comparable with melittin, the positive control. In addition, the antibacterial activity of [R4W4] against MRSA remained unchanged in the absence and presence of LTA, with an MIC of 8 µg/mL. Therefore, the [R4W4] mechanism of action is deemed bactericidal, involving interaction with bacterial cell membranes, causing concentration-dependent membrane perturbation. Additionally, after 30 serial passages, there was a modest increment of MRSA strains resistant to [R4W4] and a change in antibacterial effectiveness MIC [R4W4] and vancomycin by 8 and 4 folds with a slight change in Levofloxacin MIC 1 to 2 µg/mL. These data suggest that [R4W4] warrants further consideration as a potential AMP.
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Affiliation(s)
- Ajayi David Akinwale
- Center for Targeted Drug Delivery, Department of Biomedical and Pharmaceutical Sciences, Harry and Diane Rinker Health Science Campus, Chapman University School of Pharmacy, Irvine, CA 92618, USA (K.P.)
- Department of Pharmacy Practice, Harry and Diane Rinker Health Science Campus, Chapman University School of Pharmacy, Irvine, CA 92618, USA
| | - Keykavous Parang
- Center for Targeted Drug Delivery, Department of Biomedical and Pharmaceutical Sciences, Harry and Diane Rinker Health Science Campus, Chapman University School of Pharmacy, Irvine, CA 92618, USA (K.P.)
| | - Rakesh Kumar Tiwari
- Department of Basic Medical Sciences, College of Osteopathic Medicine of the Pacific–Northwest, Western University of Health Sciences, Lebanon, OR 97355, USA
| | - Jason Yamaki
- Department of Pharmacy Practice, Harry and Diane Rinker Health Science Campus, Chapman University School of Pharmacy, Irvine, CA 92618, USA
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5
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Karlo J, Vijay A, Phaneeswar MS, Singh SP. Sensing the Bactericidal and Bacteriostatic Antimicrobial Mode of Action Using Raman Deuterium Stable Isotope Probing (DSIP) in Escherichia coli. ACS OMEGA 2024; 9:23753-23760. [PMID: 38854576 PMCID: PMC11154948 DOI: 10.1021/acsomega.4c01666] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/21/2024] [Revised: 05/10/2024] [Accepted: 05/15/2024] [Indexed: 06/11/2024]
Abstract
The mode of action of antibiotics can be broadly classified as bacteriostatic and bactericidal. The bacteriostatic mode leads to the arrested growth of the cells, while the bacteriocidal mode causes cell death. In this work, we report the applicability of deuterium stable isotope probing (DSIP) in combination with Raman spectroscopy (Raman DSIP) for discriminating the mode of action of antibiotics at the community level. Escherichia coli, a well-known model microbe, was used as an organism for the study. We optimized the concentration of deuterium oxide required for metabolic activity monitoring without compromising the microbial growth. Our findings suggest that changes in the intensity of the C-D band in the high-wavenumber region could serve as a quantifiable marker for determining the antibiotic mode of action. This can be used for early identification of the antibiotic's mode of action. Our results explore the new perspective that supports the utility of deuterium-based vibrational tags in the field of clinical spectroscopy. Understanding the antibiotic's mode of action on bacterial cells in a short and objective manner can significantly enhance the clinical management abilities of infectious diseases and may also help in personalized antimicrobial therapy.
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Affiliation(s)
- Jiro Karlo
- Department of Biosciences
and Bioengineering, Indian Institute of
Technology Dharwad, Dharwad, Karnataka 580011, India
| | - Arunsree Vijay
- Department of Biosciences
and Bioengineering, Indian Institute of
Technology Dharwad, Dharwad, Karnataka 580011, India
| | - Mahamkali Sri Phaneeswar
- Department of Biosciences
and Bioengineering, Indian Institute of
Technology Dharwad, Dharwad, Karnataka 580011, India
| | - Surya Pratap Singh
- Department of Biosciences
and Bioengineering, Indian Institute of
Technology Dharwad, Dharwad, Karnataka 580011, India
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6
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Blondeau JM, Fitch SD. Comparative In Vitro Killing by Pradofloxacin in Comparison to Ceftiofur, Enrofloxacin, Florfenicol, Marbofloxacin, Tildipirosin, Tilmicosin and Tulathromycin against Bovine Respiratory Bacterial Pathogens. Microorganisms 2024; 12:996. [PMID: 38792823 PMCID: PMC11123926 DOI: 10.3390/microorganisms12050996] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2024] [Revised: 05/03/2024] [Accepted: 05/13/2024] [Indexed: 05/26/2024] Open
Abstract
Pradofloxacin is the newest of the veterinary fluoroquinolones to be approved for use in animals-initially companion animals and most recently food animals. It has a broad spectrum of in vitro activity, working actively against Gram-positive/negative, atypical and some anaerobic microorganisms. It simultaneously targets DNA gyrase (topoisomerase type II) and topoisomerase type IV, suggesting a lower propensity to select for antimicrobial resistance. The purpose of this study was to determine the rate and extent of bacterial killing by pradofloxacin against bovine strains of Mannheimia haemolytica and Pasteurella multocida, in comparison with several other agents (ceftiofur, enrofloxacin, florfenicol, marbofloxacin, tildipirosin, tilmicosin and tulathromycin) using four clinically relevant drug concentrations: minimum inhibitory and mutant prevention drug concentration, maximum serum and maximum tissue drug concentrations. At the maximum serum and tissue drug concentrations, pradofloxacin killed 99.99% of M. haemolytica cells following 5 min of drug exposure (versus growth to 76% kill rate for the other agents) and 94.1-98.6% of P. multocida following 60-120 min of drug exposure (versus growth to 98.6% kill rate for the other agents). Statistically significant differences in kill rates were seen between the various drugs tested depending on drug concentration and time of sampling after drug exposure.
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Affiliation(s)
- Joseph M. Blondeau
- Department of Clinical Microbiology, Royal University Hospital and Saskatchewan Health Authority, Saskatoon, SK S7N 0W8, Canada;
- Pathology and Laboratory Medicine and Ophthalmology, Departments Biochemistry, Microbiology and Immunology, University of Saskatchewan, Saskatoon, SK S7N 0W8, Canada
| | - Shantelle D. Fitch
- Department of Clinical Microbiology, Royal University Hospital and Saskatchewan Health Authority, Saskatoon, SK S7N 0W8, Canada;
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7
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King ES, Stacy AE, Scott JG. A low-footprint, fluorescence-based bacterial time-kill assay for estimating dose-dependent cell death dynamics. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.03.08.584154. [PMID: 38562844 PMCID: PMC10983867 DOI: 10.1101/2024.03.08.584154] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/04/2024]
Abstract
Dose-response curves that describe the relationship between antibiotic dose and growth rate in bacteria are commonly measured with optical density (OD) based assays. While being simple and high-throughput, any dose-dependent cell death dynamics are obscured, as OD assays in batch culture can only quantify a positive net change in cells. Time-kill experiments can be used to quantify cell death rates, but current techniques are extremely resource-intensive and may be biased by residual drug carried over into the quantification assay. Here, we report a novel, fluorescence-based time-kill assay leveraging resazurin as a viable cell count indicator. Our method improves upon previous techniques by greatly reducing the material cost and being robust to residual drug carry-over. We demonstrate our technique by quantifying a dose-response curve in Escherichia coli subject to cefotaxime, revealing dose-dependent death rates. We also show that our method is robust to extracellular debris and cell aggregation. Dose-response curves quantified with our method may provide a more accurate description of pathogen response to therapy, paving the way for more accurate integrated pharmacodynamic-pharmacokinetic studies.
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Affiliation(s)
- Eshan S. King
- Case Western Reserve University School of Medicine, Cleveland, Ohio, United States of America
| | - Anna E. Stacy
- Department of Physics, Case Western Reserve University, Cleveland, Ohio, United States of America
| | - Jacob G. Scott
- Case Western Reserve University School of Medicine, Cleveland, Ohio, United States of America
- Department of Physics, Case Western Reserve University, Cleveland, Ohio, United States of America
- Department of Translational Hematology and Oncology Research and Department of Radiation Oncology, Cleveland Clinic, Cleveland, Ohio, United States of America
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8
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Almajid A, Almuyidi S, Alahmadi S, Bohaligah S, Alfaqih L, Alotaibi A, Almarzooq A, Alsarihi A, Alrawi Z, Althaqfan R, Alamoudi R, Albaqami S, Alali AH. ''Myth Busting in Infectious Diseases'': A Comprehensive Review. Cureus 2024; 16:e57238. [PMID: 38686221 PMCID: PMC11056812 DOI: 10.7759/cureus.57238] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/30/2024] [Indexed: 05/02/2024] Open
Abstract
Antibiotics have played a pivotal role in modern medicine, drastically reducing mortality rates associated with bacterial infections. Despite their significant contributions, the emergence of antibiotic resistance has become a formidable challenge, necessitating a re-evaluation of antibiotic use practices. The widespread belief in clinical practice that bactericidal antibiotics are inherently superior to bacteriostatic ones lacks consistent support from evidence in randomized controlled trials (RCTs). With the latest evidence, certain infections have demonstrated equal or even superior efficacy with bacteriostatic agents. Furthermore, within clinical practice, there is a tendency to indiscriminately order urine cultures for febrile patients, even in cases where alternative etiologies might be present. Consequently, upon obtaining a positive urine culture result, patients often receive antimicrobial prescriptions despite the absence of clinical indications warranting such treatment. Furthermore, it is a prevailing notion among physicians that extended durations of antibiotic therapy confer potential benefits and mitigate the emergence of antimicrobial resistance. Contrary to this belief, empirical evidence refutes such assertions. This article aims to address common myths and misconceptions within the field of infectious diseases.
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Affiliation(s)
- Ali Almajid
- Internal Medicine, King Fahad Specialist Hospital, Dammam, SAU
| | | | - Shatha Alahmadi
- Medicine, Imam Abdulrahman Bin Faisal University, Dammam, SAU
| | - Sarah Bohaligah
- Medicine, Imam Abdulrahman Bin Faisal University, Dammam, SAU
| | | | | | | | - Asmaa Alsarihi
- Applied Medical Sciences, Taibah University, AlMadinah, SAU
| | - Zaina Alrawi
- Medicine, King Abdulaziz University, Jeddah, SAU
| | - Rahaf Althaqfan
- Applied Medical Sciences, King Khalid University, Khamis Mushait, SAU
| | - Rahma Alamoudi
- Medicine, Ibn Sina National College for Medical Studies, Jeddah, SAU
| | | | - Alaa H Alali
- Infectious Diseases, King Saud Medical City, Riyadh, SAU
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9
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Koch T, Hennigs A, Schmiedel S. Endocarditis guidelines: call for an interdisciplinary approach. THE LANCET. INFECTIOUS DISEASES 2024; 24:e75. [PMID: 38134950 DOI: 10.1016/s1473-3099(23)00748-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2023] [Accepted: 11/27/2023] [Indexed: 12/24/2023]
Affiliation(s)
- Till Koch
- Division of Infectious Diseases, First Department of Medicine, University Medical Center Hamburg-Eppendorf, 20251 Hamburg, Germany; Antibiotic Stewardship Team, Pharmacy, University Medical Center Hamburg-Eppendorf, 20251 Hamburg, Germany
| | - Annette Hennigs
- Division of Infectious Diseases, First Department of Medicine, University Medical Center Hamburg-Eppendorf, 20251 Hamburg, Germany.
| | - Stefan Schmiedel
- Division of Infectious Diseases, First Department of Medicine, University Medical Center Hamburg-Eppendorf, 20251 Hamburg, Germany; Infectious Diseases Clinic, University Medical Center Hamburg-Eppendorf, 20251 Hamburg, Germany
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10
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Walczak-Nowicka L, Biernasiuk A, Ziemichód W, Karczmarzyk Z, Kwaśnik M, Kozyra P, Wysocki W, Stenzel-Bembenek A, Kowalczuk D, Herbet M, Pitucha M. N-Substituted 2-(Benzenosulfonyl)-1-Carbotioamide Derivatives Exert Antimicrobial and Cytotoxic Effects via Aldehyde Dehydrogenase Pathway: Synthesis, In Silico and In Vitro Studies. Pharmaceuticals (Basel) 2023; 16:1706. [PMID: 38139832 PMCID: PMC10747733 DOI: 10.3390/ph16121706] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2023] [Revised: 11/30/2023] [Accepted: 12/03/2023] [Indexed: 12/24/2023] Open
Abstract
A series of N-Substituted 2-(benzenosulfonyl)-1-carbotioamide derivatives (WZ1-WZ4) were synthesized and characterized using spectral methods. A comprehensive activity study was performed for each compound. All compounds were tested for antibacterial activity. Moreover, in silico studies were carried out to determine the anticancer potential of the designed WZ1-WZ4 ligands. Based on molecular docking, aldehyde dehydrogenase was selected as a molecular target. The obtained data were compared with experimental data in vitro tests. Novel hybrids of the thiosemicarbazide scaffold and sulfonyl groups may have promising anticancer activity via the aldehyde dehydrogenase pathway. The best candidate for further studies appears to be WZ2, due to its superior selectivity in comparison to the other tested compounds.
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Affiliation(s)
- Lucja Walczak-Nowicka
- Chair and Department of Toxicology, Faculty of Pharmacy, Medical University of Lublin, Jaczewskiego 8b, 20-090 Lublin, Poland; (L.W.-N.); (M.H.)
| | - Anna Biernasiuk
- Department of Pharmaceutical Microbiology, Faculty of Pharmacy, Medical University of Lublin, Chodzki 1, 20-093 Lublin, Poland;
| | - Wojciech Ziemichód
- Independent Radiopharmacy Unit, Faculty of Pharmacy, Medical University of Lublin, Chodzki 4a, 20-093 Lublin, Poland; (W.Z.); (P.K.)
| | - Zbigniew Karczmarzyk
- Institute of Chemistry, University of Siedlce, 3 Maja 54, 08-110 Siedlce, Poland; (Z.K.)
| | - Mateusz Kwaśnik
- Department of Molecular Biology, Faculty of Medicine, The John Paul II Catholic University of Lublin, Konstantynów 1J/4.03, 20-708 Lublin, Poland;
| | - Paweł Kozyra
- Independent Radiopharmacy Unit, Faculty of Pharmacy, Medical University of Lublin, Chodzki 4a, 20-093 Lublin, Poland; (W.Z.); (P.K.)
| | - Waldemar Wysocki
- Institute of Chemistry, University of Siedlce, 3 Maja 54, 08-110 Siedlce, Poland; (Z.K.)
| | - Agnieszka Stenzel-Bembenek
- Department of Biochemistry and Molecular Biology, Faculty of Medical Sciences, Medical University of Lublin, Chodzki 1, 20-093 Lublin, Poland
| | - Dorota Kowalczuk
- Department of Medicinal Chemistry, Faculty of Pharmacy, Medical University of Lublin, Jaczewskiego 4, 20-090 Lublin, Poland
| | - Mariola Herbet
- Chair and Department of Toxicology, Faculty of Pharmacy, Medical University of Lublin, Jaczewskiego 8b, 20-090 Lublin, Poland; (L.W.-N.); (M.H.)
| | - Monika Pitucha
- Independent Radiopharmacy Unit, Faculty of Pharmacy, Medical University of Lublin, Chodzki 4a, 20-093 Lublin, Poland; (W.Z.); (P.K.)
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11
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Lam JC, Bourassa-Blanchette S. Ten common misconceptions about antibiotic use in the hospital. J Hosp Med 2023; 18:1123-1129. [PMID: 37812004 DOI: 10.1002/jhm.13220] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/14/2023] [Revised: 08/28/2023] [Accepted: 09/27/2023] [Indexed: 10/10/2023]
Abstract
Antimicrobials are one of the most administered medications in hospitals. Thoughtful and rational antibiotic prescribing by clinicians are important in reducing the adverse effects to both the host that takes the antibiotic and also the individuals in the host's community. Principles informing antibiotic prescribing in the hospital are commonly rooted in misconceptions. We review 10 common myths associated with antibacterial usage in hospitalized patients and share contemporary evidence in hopes of enhancing evidence-informed practice in this patient care setting.
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Affiliation(s)
- John C Lam
- Division of Infectious Diseases, Department of Medicine, University of California Los Angeles, Los Angeles, California, USA
| | - Samuel Bourassa-Blanchette
- Division of Infectious Diseases, Department of Medicine, Memorial University of Newfoundland, St. John's, Newfoundland, Canada
- Division of Microbiology, Department of Pathology and Laboratory Medicine, Memorial University of Newfoundland, St. John's, Newfoundland, Canada
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12
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Angela S, Lleò MM, Bontempi P, Boschi F. A New Method to Easily Assess Bacteriostatic and Bactericidal Activity of Ultraviolet Radiation Using Quantitative Image Analysis. Photochem Photobiol 2023; 99:1476-1482. [PMID: 36825386 DOI: 10.1111/php.13796] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2022] [Accepted: 02/21/2023] [Indexed: 02/25/2023]
Abstract
Ultraviolet (UV) radiation can elicit both bactericidal and bacteriostatic activity depending on light parameters and targeted bacteria. Current methods based on bacterial growth on solid medium allow measurement of only bactericidal but not bacteriostatic activity, while liquid cultures exhibit low light penetration. Here, we propose a method to quantify both bactericidal and bacteriostatic activity of radiation based on (a) bacterial cultures on solid medium, (b) acquisition and quantitative analysis of photographic images of plates containing bacterial colonies, (c) application of two mathematical equations to evaluate bactericidal and bacteriostatic activity. The proposed method considers the differences in growth on test and control (unexposed) plates. The measurements performed on the plates image are the independent variables of the mathematical equations returning the values of bactericidal and bacteriostatic activity. Experimentally, a test was performed using Escherichia coli grown on a solid medium and exposed to UVA (365 nm) radiation. The standard method allowed quantifying bactericidal activity and evaluating only qualitatively bacteriostatic activity of the radiation. Differently, the new method here proposed allowed quantification of both activities. The proposed method proved to be simple, enabling deep assessment of the antibacterial effects of UV radiation directly on the solid medium through image acquisition and analysis.
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Affiliation(s)
- Sandri Angela
- Department of Diagnostics and Public Health, Microbiology Section, University of Verona, Verona, Italy
| | - Maria M Lleò
- Department of Diagnostics and Public Health, Microbiology Section, University of Verona, Verona, Italy
| | - Pietro Bontempi
- Department of Computer Science, University of Verona, Verona, Italy
| | - Federico Boschi
- Department of Computer Science, University of Verona, Verona, Italy
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13
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León Madrazo A, Segura Campos MR. Antibacterial properties of peptides from chia (Salvia hispanica L.) applied to pork meat preservation. J Food Sci 2023; 88:4194-4217. [PMID: 37655475 DOI: 10.1111/1750-3841.16754] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Revised: 08/08/2023] [Accepted: 08/11/2023] [Indexed: 09/02/2023]
Abstract
Chia-derived peptides might represent a novel alternative to conventional preservatives in food. Despite the antibacterial potential of these molecules, their food application is still limited. This study aimed to evaluate chia-derived peptides' antibacterial and antibiofilm potential in food preservation. The peptides YACLKVK, KLKKNL, KLLKKYL, and KKLLKI were synthesized, and their antibacterial activity against Listeria monocytogenes, Staphylococcus aureus, Enterococcus faecalis, Escherichia coli, and Salmonella Enteritidis was evaluated through microdilution tests. A bacterial killing kinetic assay determined bacterial growth over time. The ability to prevent and eradicate S. aureus biofilm was assessed by crystal violet staining. The hemolytic and cytotoxic activities were determined in human red blood cells and fibroblasts using free hemoglobin detection and (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide) assays, respectively. Finally, a microbial challenge was performed on meat samples inoculated with L. monocytogenes and S. Enteritidis to determine their inhibitory effects on pork meat. Results showed the potential antibacterial activity of these peptides, with minimum inhibitory concentrations ranging from 0.23 to 5.58 mg/mL. Biofilm inhibition percentages were above 40%, and eradication percentages were lower than 20%. In vitro assays in human red blood cells and fibroblasts demonstrated that peptides are not hemolytic or cytotoxic agents. In microbiological challenge testing, KKLLKI showed the most promising antibacterial effects against S. Enteritidis on refrigerated pork meat samples. These findings suggest that chia-derived peptides have the potential as natural food preservatives due to their antibacterial and antibiofilm properties. Notably, KKLLKI demonstrated promising antibacterial effects against Salmonella spp. on a complex food matrix, such as pork meat. PRACTICAL APPLICATION: Chia-derived peptides can be a safer alternative to synthetic preservatives in the food industry because the latter may be detrimental to human health. Salmonella spp. growth on chilled pork meat was shown to be inhibited by the peptide KKLLKI, indicating that the use of these peptides may offer a more secure and natural alternative to synthetic preservatives.
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Affiliation(s)
- Anaí León Madrazo
- Faculty of Chemical Engineering, Autonomous University of Yucatán, Merida, Mexico
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14
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Stevanovic M, Carvalho JPT, Bittihn P, Schultz D. Dynamical model of antibiotic responses linking expression of resistance to metabolism explains emergence of heterogeneity during drug exposures. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.09.22.558994. [PMID: 37790326 PMCID: PMC10542528 DOI: 10.1101/2023.09.22.558994] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/05/2023]
Abstract
Antibiotic responses in bacteria are highly dynamic and heterogeneous, with sudden exposure of bacterial colonies to high drug doses resulting in the coexistence of recovered and arrested cells. The dynamics of the response is determined by regulatory circuits controlling the expression of resistance genes, which are in turn modulated by the drug's action on cell growth and metabolism. Despite advances in understanding gene regulation at the molecular level, we still lack a framework to describe how feedback mechanisms resulting from the interdependence between expression of resistance and cell metabolism can amplify naturally occurring noise and create heterogeneity at the population level. To understand how this interplay affects cell survival upon exposure, we constructed a mathematical model of the dynamics of antibiotic responses that links metabolism and regulation of gene expression, based on the tetracycline resistance tet operon in E. coli. We use this model to interpret measurements of growth and expression of resistance in microfluidic experiments, both in single cells and in biofilms. We also implemented a stochastic model of the drug response, to show that exposure to high drug levels results in large variations of recovery times and heterogeneity at the population level. We show that stochasticity is important to determine how nutrient quality affects cell survival during exposure to high drug concentrations. A quantitative description of how microbes respond to antibiotics in dynamical environments is crucial to understand population-level behaviors such as biofilms and pathogenesis.
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Affiliation(s)
- Mirjana Stevanovic
- Department of Microbiology and Immunology, Geisel School of Medicine at Dartmouth, Hanover, NH, United States
| | - João Pedro Teuber Carvalho
- Department of Microbiology and Immunology, Geisel School of Medicine at Dartmouth, Hanover, NH, United States
| | - Philip Bittihn
- Max Planck Institute for Dynamics and Self-Organization, Göttingen, Germany
- Institute for the Dynamics of Complex Systems, University of Göttingen, Göttingen, Germany
| | - Daniel Schultz
- Department of Microbiology and Immunology, Geisel School of Medicine at Dartmouth, Hanover, NH, United States
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15
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Lee EB, Abbas MA, Park J, Tassew DD, Park SC. Optimizing tylosin dosage for co-infection of Actinobacillus pleuropneumoniae and Pasteurella multocida in pigs using pharmacokinetic/pharmacodynamic modeling. Front Pharmacol 2023; 14:1258403. [PMID: 37808183 PMCID: PMC10556534 DOI: 10.3389/fphar.2023.1258403] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Accepted: 09/04/2023] [Indexed: 10/10/2023] Open
Abstract
Formulating a therapeutic strategy that can effectively combat concurrent infections of Actinobacillus pleuropneumoniae (A. pleuropneumoniae) and Pasteurella multocida (P. multocida) can be challenging. This study aimed to 1) establish minimum inhibitory concentration (MIC), minimum bactericidal concentration (MBC), time kill curve, and post-antibiotic effect (PAE) of tylosin against A. pleuropneumoniae and P. multocida pig isolates and employ the MIC data for the development of epidemiological cutoff (ECOFF) values; 2) estimate the pharmacokinetics (PKs) of tylosin following its intramuscular (IM) administration (20 mg/kg) in healthy and infected pigs; and 3) establish a PK-pharmacodynamic (PD) integrated model and predict optimal dosing regimens and PK/PD cutoff values for tylosin in healthy and infected pigs. The MIC of tylosin against both 89 and 363 isolates of A. pleuropneumoniae and P. multocida strains spread widely, ranging from 1 to 256 μg/mL and from 0.5 to 128 μg/mL, respectively. According to the European Committee on Antimicrobial Susceptibility Testing (EUCAST) ECOFFinder analysis ECOFF value (≤64 µg/mL), 97.75% (87 strains) of the A. pleuropnumoniae isolates were wild-type, whereas with the same ECOFF value (≤64 µg/mL), 99.72% (363 strains) of the P. multicoda isolates were considered wild-type to tylosin. Area under the concentration time curve (AUC), T1/2, and Cmax values were significantly greater in healthy pigs than those in infected pigs (13.33 h × μg/mL, 1.99 h, and 5.79 μg/mL vs. 10.46 h × μg/mL, 1.83 h, and 3.59 μg/mL, respectively) (p < 0.05). In healthy pigs, AUC24 h/MIC values for the bacteriostatic activity were 0.98 and 1.10 h; for the bactericidal activity, AUC24 h/MIC values were 1.97 and 1.99 h for A. pleuropneumoniae and P. multocida, respectively. In infected pigs, AUC24 h/MIC values for the bacteriostatic activity were 1.03 and 1.12 h; for bactericidal activity, AUC24 h/MIC values were 2.54 and 2.36 h for A. pleuropneumoniae and P. multocida, respectively. Monte Carlo simulation lead to a 2 μg/mL calculated PK/PD cutoff. Managing co-infections can present challenges, as it often demands the administration of multiple antibiotics to address diverse pathogens. However, using tylosin, which effectively targets both A. pleuropneumoniae and P. multocida in pigs, may enhance the control of bacterial burden. By employing an optimized dosage of 11.94-15.37 mg/kg and 25.17-27.79 mg/kg of tylosin can result in achieving bacteriostatic and bactericidal effects in 90% of co-infected pigs.
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Affiliation(s)
- Eon-Bee Lee
- Laboratory of Veterinary Pharmacokinetics and Pharmacodynamics, College of Veterinary Medicine, Kyungpook National University, Daegu, Republic of Korea
| | - Muhammad Aleem Abbas
- Laboratory of Veterinary Pharmacokinetics and Pharmacodynamics, College of Veterinary Medicine, Kyungpook National University, Daegu, Republic of Korea
| | - Jonghyun Park
- Laboratory of Veterinary Pharmacokinetics and Pharmacodynamics, College of Veterinary Medicine, Kyungpook National University, Daegu, Republic of Korea
- DIVA Bio Incorporation, Daegu, Republic of Korea
| | | | - Seung-Chun Park
- Laboratory of Veterinary Pharmacokinetics and Pharmacodynamics, College of Veterinary Medicine, Kyungpook National University, Daegu, Republic of Korea
- Cardiovascular Research Institute, Kyungpook National University, Daegu, Republic of Korea
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16
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Eke IE, Williams JT, Haiderer ER, Albrecht VJ, Murdoch HM, Abdalla BJ, Abramovitch RB. Discovery and characterization of antimycobacterial nitro-containing compounds with distinct mechanisms of action and in vivo efficacy. Antimicrob Agents Chemother 2023; 67:e0047423. [PMID: 37610224 PMCID: PMC10508139 DOI: 10.1128/aac.00474-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2023] [Accepted: 06/30/2023] [Indexed: 08/24/2023] Open
Abstract
Nitro-containing compounds have emerged as important agents in the control of tuberculosis (TB). From a whole-cell high-throughput screen for Mycobacterium tuberculosis (Mtb) growth inhibitors, 10 nitro-containing compounds were prioritized for characterization and mechanism of action studies. HC2209, HC2210, and HC2211 are nitrofuran-based prodrugs that need the cofactor F420 machinery for activation. Unlike pretomanid which depends only on deazaflavin-dependent nitroreductase (Ddn), these nitrofurans depend on Ddn and possibly another F420-dependent reductase for activation. These nitrofurans also differ from pretomanid in their potent activity against Mycobacterium abscessus. Four dinitrobenzamides (HC2217, HC2226, HC2238, and HC2239) and a nitrofuran (HC2250) are proposed to be inhibitors of decaprenyl-phosphoryl-ribose 2'-epimerase 1 (DprE1), based on isolation of resistant mutations in dprE1. Unlike other DprE1 inhibitors, HC2250 was found to be potent against non-replicating persistent bacteria, suggesting additional targets. Two of the compounds, HC2233 and HC2234, were found to have potent, sterilizing activity against replicating and non-replicating Mtb in vitro, but a proposed mechanism of action could not be defined. In a pilot in vivo efficacy study, HC2210 was orally bioavailable and efficacious in reducing bacterial load by ~1 log in a chronic murine TB infection model.
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Affiliation(s)
- Ifeanyichukwu E. Eke
- Department of Microbiology and Molecular Genetics, Michigan State University, East Lansing, Michigan, USA
| | - John T. Williams
- Department of Microbiology and Molecular Genetics, Michigan State University, East Lansing, Michigan, USA
| | - Elizabeth R. Haiderer
- Department of Microbiology and Molecular Genetics, Michigan State University, East Lansing, Michigan, USA
| | - Veronica J. Albrecht
- Department of Microbiology and Molecular Genetics, Michigan State University, East Lansing, Michigan, USA
| | - Heather M. Murdoch
- Department of Microbiology and Molecular Genetics, Michigan State University, East Lansing, Michigan, USA
| | - Bassel J. Abdalla
- Department of Microbiology and Molecular Genetics, Michigan State University, East Lansing, Michigan, USA
| | - Robert B. Abramovitch
- Department of Microbiology and Molecular Genetics, Michigan State University, East Lansing, Michigan, USA
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17
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Freling S, Wald-Dickler N, Banerjee J, Canamar CP, Tangpraphaphorn S, Bruce D, Davar K, Dominguez F, Norwitz D, Krishnamurthi G, Fung L, Guanzon A, Minejima E, Spellberg M, Spellberg C, Baden R, Holtom P, Spellberg B. Real-World Application of Oral Therapy for Infective Endocarditis: A Multicenter, Retrospective, Cohort Study. Clin Infect Dis 2023; 77:672-679. [PMID: 36881940 DOI: 10.1093/cid/ciad119] [Citation(s) in RCA: 15] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2023] [Revised: 02/16/2023] [Accepted: 03/01/2023] [Indexed: 03/09/2023] Open
Abstract
BACKGROUND We sought to compare the outcomes of patients treated with intravenous (IV)-only vs oral transitional antimicrobial therapy for infective endocarditis (IE) after implementing a new expected practice within the Los Angeles County Department of Health Services (LAC DHS). METHODS We conducted a multicentered, retrospective cohort study of adults with definite or possible IE treated with IV-only vs oral therapy at the 3 acute care public hospitals in the LAC DHS system between December 2018 and June 2022. The primary outcome was clinical success at 90 days, defined as being alive and without recurrence of bacteremia or treatment-emergent infectious complications. RESULTS We identified 257 patients with IE treated with IV-only (n = 211) or oral transitional (n = 46) therapy who met study inclusion criteria. Study arms were similar for many demographics; however, the IV cohort was older, had more aortic valve involvement, were hemodialysis patients, and had central venous catheters present. In contrast, the oral cohort had a higher percentage of IE caused by methicillin-resistant Staphylococcus aureus. There was no significant difference between the groups in clinical success at 90 days or last follow-up. There was no difference in recurrence of bacteremia or readmission rates. However, patients treated with oral therapy had significantly fewer adverse events. Multivariable regression adjustments did not find significant associations between any selected variables and clinical success across treatment groups. CONCLUSIONS These results demonstrate similar outcomes of real-world use of oral vs IV-only therapy for IE, in accord with prior randomized, controlled trials and meta-analyses.
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Affiliation(s)
- Sarah Freling
- Department of Medicine and Infectious Diseases, Los Angeles County + University of Southern California Medical Center, Los Angeles, California, USA
- Department of Medicine, Keck School of Medicine-University of Southern California, Los Angeles, California, USA
| | - Noah Wald-Dickler
- Department of Medicine and Infectious Diseases, Los Angeles County + University of Southern California Medical Center, Los Angeles, California, USA
- Department of Medicine, Keck School of Medicine-University of Southern California, Los Angeles, California, USA
| | - Josh Banerjee
- Department of Medicine and Infectious Diseases, Los Angeles County + University of Southern California Medical Center, Los Angeles, California, USA
| | - Catherine P Canamar
- Department of Medicine and Infectious Diseases, Los Angeles County + University of Southern California Medical Center, Los Angeles, California, USA
| | - Soodtida Tangpraphaphorn
- Department of Medicine and Infectious Diseases, Los Angeles County + University of Southern California Medical Center, Los Angeles, California, USA
| | - Dara Bruce
- Department of Integrative Anatomical Sciences, Keck School of Medicine-University of Southern California, Los Angeles, California, USA
| | - Kusha Davar
- Department of Medicine and Infectious Diseases, Los Angeles County + University of Southern California Medical Center, Los Angeles, California, USA
| | - Fernando Dominguez
- Department of Medicine and Infectious Diseases, Los Angeles County + University of Southern California Medical Center, Los Angeles, California, USA
| | - Daniel Norwitz
- Department of Integrative Anatomical Sciences, Keck School of Medicine-University of Southern California, Los Angeles, California, USA
| | - Ganesh Krishnamurthi
- Department of Medicine and Infectious Diseases, Los Angeles County + University of Southern California Medical Center, Los Angeles, California, USA
- Department of Medicine, Keck School of Medicine-University of Southern California, Los Angeles, California, USA
| | - Lilian Fung
- Department of Medicine and Infectious Diseases, Los Angeles County + University of Southern California Medical Center, Los Angeles, California, USA
- Department of Medicine, Keck School of Medicine-University of Southern California, Los Angeles, California, USA
| | - Ashley Guanzon
- Department of Medicine and Infectious Diseases, Los Angeles County + University of Southern California Medical Center, Los Angeles, California, USA
- Department of Pharmacy, University of Southern California Mann School of Pharmacy and Pharmaceutical Sciences, Los Angeles, California, USA
| | - Emi Minejima
- Department of Medicine and Infectious Diseases, Los Angeles County + University of Southern California Medical Center, Los Angeles, California, USA
- Department of Pharmacy, University of Southern California Mann School of Pharmacy and Pharmaceutical Sciences, Los Angeles, California, USA
| | - Michael Spellberg
- Department of Medicine and Infectious Diseases, Los Angeles County + University of Southern California Medical Center, Los Angeles, California, USA
| | - Catherine Spellberg
- Department of Medicine and Infectious Diseases, Los Angeles County + University of Southern California Medical Center, Los Angeles, California, USA
| | - Rachel Baden
- Department of Medicine and Infectious Diseases, Los Angeles County + University of Southern California Medical Center, Los Angeles, California, USA
| | - Paul Holtom
- Department of Medicine and Infectious Diseases, Los Angeles County + University of Southern California Medical Center, Los Angeles, California, USA
- Department of Medicine, Keck School of Medicine-University of Southern California, Los Angeles, California, USA
| | - Brad Spellberg
- Department of Medicine and Infectious Diseases, Los Angeles County + University of Southern California Medical Center, Los Angeles, California, USA
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18
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Faller E, Jackson A. A cost minimisation analysis comparing oral linezolid and intravenous daptomycin administered via an outpatient parenteral antibiotic therapy programme in patients requiring prolonged antibiotic courses. J Chemother 2023; 35:411-424. [PMID: 36398996 DOI: 10.1080/1120009x.2022.2145452] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2022] [Revised: 10/28/2022] [Accepted: 11/03/2022] [Indexed: 11/20/2022]
Abstract
This study is an economic analysis seeking to examine cost savings that may be accrued from usage of oral linezolid in place of OPAT IV daptomycin in patients requiring prolonged courses of IV or highly bioavailable oral antibiotic therapy. In order to do so we conducted a literature review to establish the scenarios in which the agents could be considered equivalent. We then, using a decision-tree model, conducted a cost analysis to establish differences in cost between the approaches. Under the model base-case, the total cost of treatment with OPAT daptomycin was €3,496.84 and the total cost of treatment with oral linezolid was €772.01. Therefore the oral linezolid strategy would be projected to save the Irish health service €2,724.83 per patient. These results were robust to one-way deterministic sensitivity analyses and probabilistic sensitivity analysis. Our study suggests that significant savings could be safely accrued in the management of these patients.
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Affiliation(s)
- E Faller
- Infectious Disease Department, Cork University Hospital (CUH), Cork, Ireland
- London School of Economics and Political Science, London, UK
| | - A Jackson
- Infectious Disease Department, Cork University Hospital (CUH), Cork, Ireland
- School of Medicine, UCC, College Road, Cork, Ireland
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19
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Czuppon P, Day T, Débarre F, Blanquart F. A stochastic analysis of the interplay between antibiotic dose, mode of action, and bacterial competition in the evolution of antibiotic resistance. PLoS Comput Biol 2023; 19:e1011364. [PMID: 37578976 PMCID: PMC10449190 DOI: 10.1371/journal.pcbi.1011364] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2023] [Revised: 08/24/2023] [Accepted: 07/17/2023] [Indexed: 08/16/2023] Open
Abstract
The use of an antibiotic may lead to the emergence and spread of bacterial strains resistant to this antibiotic. Experimental and theoretical studies have investigated the drug dose that minimizes the risk of resistance evolution over the course of treatment of an individual, showing that the optimal dose will either be the highest or the lowest drug concentration possible to administer; however, no analytical results exist that help decide between these two extremes. To address this gap, we develop a stochastic mathematical model of bacterial dynamics under antibiotic treatment. We explore various scenarios of density regulation (bacterial density affects cell birth or death rates), and antibiotic modes of action (biostatic or biocidal). We derive analytical results for the survival probability of the resistant subpopulation until the end of treatment, the size of the resistant subpopulation at the end of treatment, the carriage time of the resistant subpopulation until it is replaced by a sensitive one after treatment, and we verify these results with stochastic simulations. We find that the scenario of density regulation and the drug mode of action are important determinants of the survival of a resistant subpopulation. Resistant cells survive best when bacterial competition reduces cell birth and under biocidal antibiotics. Compared to an analogous deterministic model, the population size reached by the resistant type is larger and carriage time is slightly reduced by stochastic loss of resistant cells. Moreover, we obtain an analytical prediction of the antibiotic concentration that maximizes the survival of resistant cells, which may help to decide which drug dosage (not) to administer. Our results are amenable to experimental tests and help link the within and between host scales in epidemiological models.
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Affiliation(s)
- Peter Czuppon
- Institute for Evolution and Biodiversity, University of Münster, Münster, Germany
- Institute of Ecology and Environmental Sciences of Paris, Sorbonne Université, UPEC, CNRS, IRD, INRA, Paris, France
- Center for Interdisciplinary Research in Biology, CNRS, Collège de France, PSL Research University, Paris, France
| | - Troy Day
- Department of Mathematics and Statistics, Department of Biology, Queen’s University, Kingston, Canada
| | - Florence Débarre
- Institute of Ecology and Environmental Sciences of Paris, Sorbonne Université, UPEC, CNRS, IRD, INRA, Paris, France
| | - François Blanquart
- Center for Interdisciplinary Research in Biology, CNRS, Collège de France, PSL Research University, Paris, France
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20
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Tauber SC, Nau R. Treatment of septic encephalopathy and encephalitis - a critical appraisal. Expert Rev Neurother 2023; 23:1069-1080. [PMID: 38019041 DOI: 10.1080/14737175.2023.2288652] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2023] [Accepted: 11/23/2023] [Indexed: 11/30/2023]
Abstract
INTRODUCTION The central nervous system is frequently involved during severe sepsis. Patients either develop septic encephalopathy characterized by delirium and coma or focal neurological signs as a consequence of septic-embolic or septic-metastatic encephalitis. AREAS COVERED In this review, a summary of currently available literature on established and some promising experimental treatment options for septic encephalopathy and encephalitis is provided, with a focus on the clinical utility of published studies. EXPERT OPINION Treatment relies on proper identification of the causative pathogen and rapidly initiated adequate empirical or (after identification of the pathogen) tailored antibiotic therapy, fluid and electrolyte management. In the presence of brain abscess(es) or mycotic aneurysm(s), surgery or interventional neuroradiology must be considered. Pharmacological approaches to prevent delirium of different etiology include the use of dexmedetomidine and (with limitations) of melatonin and its derivatives. In the absence of a specific pharmacological treatment, non-pharmacological bundles of interventions (e.g. promotion of sleep, cognitive stimulation, early mobilization and adequate therapy of pain) are of proven efficacy to prevent delirium of different etiology including sepsis. Experimental promising therapies include the use of non-bacteriolytic antibiotics and the reduction of the toxic effects of microglial activation.
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Affiliation(s)
- Simone C Tauber
- Department of Neurology, RWTH University Hospital Aachen, Aachen, Germany
| | - Roland Nau
- Department of Neuropathology, University Medicine Göttingen, Georg-August-University Göttingen, Göttingen, Germany
- Department of Geriatrics, Evangelisches Krankenhaus Göttingen-Weende, Göttingen, Germany
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21
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Kawasuji H, Nagaoka K, Tsuji Y, Kimoto K, Takegoshi Y, Kaneda M, Murai Y, Karaushi H, Mitsutake K, Yamamoto Y. Effectiveness and Safety of Linezolid Versus Vancomycin, Teicoplanin, or Daptomycin against Methicillin-Resistant Staphylococcus aureus Bacteremia: A Systematic Review and Meta-Analysis. Antibiotics (Basel) 2023; 12:antibiotics12040697. [PMID: 37107059 PMCID: PMC10135165 DOI: 10.3390/antibiotics12040697] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2023] [Revised: 03/19/2023] [Accepted: 03/28/2023] [Indexed: 04/05/2023] Open
Abstract
Vancomycin (VCM) and daptomycin (DAP) are standard therapies for methicillin-resistant Staphylococcus aureus (MRSA) bacteremia, despite concerns regarding clinical utility and growing resistance. Linezolid (LZD) affords superior tissue penetration to VCM or DAP and has been successfully used as salvage therapy for persistent MRSA bacteremia, indicating its utility as a first-choice drug against MRSA bacteremia. In a systematic review and meta-analysis, we compared the effectiveness and safety of LZD with VCM, teicoplanin (TEIC), or DAP in patients with MRSA bacteremia. We evaluated all-cause mortality as the primary effectiveness outcome, clinical and microbiological cure, hospital length of stay, recurrence, and 90-day readmission rates as secondary effectiveness outcomes, and drug-related adverse effects as primary safety outcomes. We identified 5328 patients across 2 randomized controlled trials (RCTs), 1 pooled analysis of 5 RCTs, 1 subgroup analysis (1 RCT), and 5 case-control and cohort studies (CSs). Primary and secondary effectiveness outcomes were comparable between patients treated with LZD versus VCM, TEIC, or DAP in RCT-based studies and CSs. There was no difference in adverse event incidence between LZD and comparators. These findings suggest that LZD could be a potential first-line drug against MRSA bacteremia as well as VCM or DAP.
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Affiliation(s)
- Hitoshi Kawasuji
- Department of Clinical Infectious Diseases, Toyama University Graduate School of Medicine and Pharmaceutical Sciences, Toyama 930-0194, Japan
| | - Kentaro Nagaoka
- Department of Clinical Infectious Diseases, Toyama University Graduate School of Medicine and Pharmaceutical Sciences, Toyama 930-0194, Japan
| | - Yasuhiro Tsuji
- Laboratory of Clinical Pharmacometrics, School of Pharmacy, Nihon University, Chiba 274-8555, Japan
| | - Kou Kimoto
- Department of Clinical Infectious Diseases, Toyama University Graduate School of Medicine and Pharmaceutical Sciences, Toyama 930-0194, Japan
| | - Yusuke Takegoshi
- Department of Clinical Infectious Diseases, Toyama University Graduate School of Medicine and Pharmaceutical Sciences, Toyama 930-0194, Japan
| | - Makito Kaneda
- Department of Clinical Infectious Diseases, Toyama University Graduate School of Medicine and Pharmaceutical Sciences, Toyama 930-0194, Japan
| | - Yushi Murai
- Department of Clinical Infectious Diseases, Toyama University Graduate School of Medicine and Pharmaceutical Sciences, Toyama 930-0194, Japan
| | - Haruka Karaushi
- Department of Infectious Diseases and Infection Control, International Medical Center, Saitama Medical University School of Medicine, Saitama 350-1298, Japan
| | - Kotaro Mitsutake
- Department of Infectious Diseases and Infection Control, International Medical Center, Saitama Medical University School of Medicine, Saitama 350-1298, Japan
| | - Yoshihiro Yamamoto
- Department of Clinical Infectious Diseases, Toyama University Graduate School of Medicine and Pharmaceutical Sciences, Toyama 930-0194, Japan
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22
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Inferring density-dependent population dynamics mechanisms through rate disambiguation for logistic birth-death processes. J Math Biol 2023; 86:50. [PMID: 36864131 DOI: 10.1007/s00285-023-01877-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2022] [Revised: 11/21/2022] [Accepted: 01/18/2023] [Indexed: 03/04/2023]
Abstract
Density dependence is important in the ecology and evolution of microbial and cancer cells. Typically, we can only measure net growth rates, but the underlying density-dependent mechanisms that give rise to the observed dynamics can manifest in birth processes, death processes, or both. Therefore, we utilize the mean and variance of cell number fluctuations to separately identify birth and death rates from time series that follow stochastic birth-death processes with logistic growth. Our nonparametric method provides a novel perspective on stochastic parameter identifiability, which we validate by analyzing the accuracy in terms of the discretization bin size. We apply our method to the scenario where a homogeneous cell population goes through three stages: (1) grows naturally to its carrying capacity, (2) is treated with a drug that reduces its carrying capacity, and (3) overcomes the drug effect to restore its original carrying capacity. In each stage, we disambiguate whether the dynamics occur through the birth process, death process, or some combination of the two, which contributes to understanding drug resistance mechanisms. In the case of limited sample sizes, we provide an alternative method based on maximum likelihood and solve a constrained nonlinear optimization problem to identify the most likely density dependence parameter for a given cell number time series. Our methods can be applied to other biological systems at different scales to disambiguate density-dependent mechanisms underlying the same net growth rate.
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Abstract
Almost all bactericidal drugs require bacterial replication and/or metabolic activity for their killing activity. When these processes are inhibited by bacteriostatic antibiotics, bacterial killing is significantly reduced. One notable exception is the lipopeptide antibiotic daptomycin, which has been reported to efficiently kill growth-arrested bacteria. However, these studies employed only short periods of growth arrest (<1 h), which may not fully represent the duration of growth arrest that can occur in vivo. We found that a growth inhibitory concentration of the protein synthesis inhibitor tetracycline led to a time-dependent induction of daptomycin tolerance in S. aureus, with an approximately 100,000-fold increase in survival after 16 h of growth arrest, relative to exponential-phase bacteria. Daptomycin tolerance required glucose and was associated with increased production of the cell wall polymers peptidoglycan and wall-teichoic acids. However, while the accumulation of peptidoglycan was required for daptomycin tolerance, only a low abundance of wall teichoic acid was necessary. Therefore, whereas tolerance to most antibiotics occurs passively due to a lack of metabolic activity and/or replication, daptomycin tolerance arises via active cell wall remodelling. IMPORTANCE Understanding why antibiotics sometimes fail to cure infections is fundamental to improving treatment outcomes. This is a major challenge when it comes to Staphylococcus aureus because this pathogen causes several different chronic or recurrent infections. Previous work has shown that a lack of replication, as often occurs during infection, makes bacteria tolerant of most bactericidal antibiotics. However, one antibiotic that has been reported to kill nonreplicating bacteria is daptomycin. In this work, we show that the growth arrest of S. aureus does in fact lead to daptomycin tolerance, but it requires time, nutrients, and biosynthetic pathways, making it distinct from other types of antibiotic tolerance that occur in nonreplicating bacteria.
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Dague AL, Valeeva LR, McCann NM, Sharipova MR, Valentovic MA, Bogomolnaya LM, Shakirov EV. Identification and Analysis of Antimicrobial Activities from a Model Moss Ceratodon purpureus. Metabolites 2023; 13:350. [PMID: 36984790 PMCID: PMC10057591 DOI: 10.3390/metabo13030350] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2023] [Revised: 02/21/2023] [Accepted: 02/24/2023] [Indexed: 03/02/2023] Open
Abstract
The emergence of bacterial drug resistance is often viewed as the next great health crisis of our time. While more antimicrobial agents are urgently needed, very few new antibiotics are currently in the production pipeline. Here, we aim to identify and characterize novel antimicrobial natural products from a model dioicous moss, Ceratodon purpureus. We collected secreted moss exudate fractions from two C. purpureus strains, male R40 and female GG1. Exudates from the female C. purpureus strain GG1 did not exhibit inhibitory activity against any tested bacteria. However, exudates from the male moss strain R40 exhibited strong inhibitory properties against several species of Gram-positive bacteria, including Staphylococcus aureus and Enterococcus faecium, though they did not inhibit the growth of Gram-negative bacteria. Antibacterial activity levels in C. purpureus R40 exudates significantly increased over four weeks of moss cultivation in liquid culture. Size fractionation experiments indicated that the secreted bioactive compounds have a relatively low molecular weight of less than 1 kDa. Additionally, the R40 exudate compounds are thermostable and not sensitive to proteinase K treatment. Overall, our results suggest that the bioactive compounds present in C. purpureus R40 exudates can potentially add new options for treating infections caused by antibiotic-resistant Gram-positive bacteria.
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Affiliation(s)
- Ashley L. Dague
- Department of Biomedical Sciences, Joan C. Edwards School of Medicine, Marshall University, Huntington, WV 25755, USA
| | - Lia R. Valeeva
- Department of Biological Sciences, College of Science, Marshall University, Huntington, WV 25701, USA
- Institute of Fundamental Medicine and Biology, Kazan Federal University, Kazan 420008, Russia
| | - Natalie M. McCann
- Department of Biological Sciences, College of Science, Marshall University, Huntington, WV 25701, USA
| | - Margarita R. Sharipova
- Institute of Fundamental Medicine and Biology, Kazan Federal University, Kazan 420008, Russia
| | - Monica A. Valentovic
- Department of Biomedical Sciences, Joan C. Edwards School of Medicine, Marshall University, Huntington, WV 25755, USA
| | - Lydia M. Bogomolnaya
- Department of Biomedical Sciences, Joan C. Edwards School of Medicine, Marshall University, Huntington, WV 25755, USA
| | - Eugene V. Shakirov
- Department of Biomedical Sciences, Joan C. Edwards School of Medicine, Marshall University, Huntington, WV 25755, USA
- Department of Biological Sciences, College of Science, Marshall University, Huntington, WV 25701, USA
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Zuma NH, Aucamp J, Janse van Rensburg HD, N'Da DD. Synthesis and in vitro antileishmanial activity of alkylene-linked nitrofurantoin-triazole hybrids. Eur J Med Chem 2023; 246:115012. [PMID: 36516584 DOI: 10.1016/j.ejmech.2022.115012] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2022] [Revised: 12/01/2022] [Accepted: 12/06/2022] [Indexed: 12/12/2022]
Abstract
Leishmaniasis is a vector-borne parasitic disease that mostly affects populations in tropical and sub-tropical countries. There is currently no protective anti-leishmanial vaccine and only a paucity of clinical drugs is available to treat this disease albeit their toxicity. Leishmaniasis is curable but its eradication and elimination have been hampered by the emergence of multidrug resistant strains of the causative pathogens. This heightens the necessity for new and effective antileishmanial drugs. In search for such agents, nitrofurantoin, a clinical antibiotic, was appended to triazole scaffold through alkylene linkers of various length, and the resulting hybrids were evaluated for in vitro antileishmanial efficacy against Leishmania (L.) parasite of two strains. The hybrid 13, harboring a n-pentylene linker was uncovered as a leishmanicidal hit with micromolar activity against antimonial-resistant L. donovani, the causative of deadly visceral Leishmaniasis.
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Affiliation(s)
- Nonkululeko H Zuma
- Centre of Excellence for Pharmaceutical Sciences, North-West University, Potchefstroom, 2520, South Africa
| | - Janine Aucamp
- Centre of Excellence for Pharmaceutical Sciences, North-West University, Potchefstroom, 2520, South Africa
| | | | - David D N'Da
- Centre of Excellence for Pharmaceutical Sciences, North-West University, Potchefstroom, 2520, South Africa.
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Niu T, Zhang Y, Li Z, Bian Y, Zhang J, Wang Y. The association between penicillin allergy and surgical site infection after orthopedic surgeries: a retrospective cohort study. Front Cell Infect Microbiol 2023; 13:1182778. [PMID: 37153141 PMCID: PMC10160653 DOI: 10.3389/fcimb.2023.1182778] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2023] [Accepted: 04/03/2023] [Indexed: 05/09/2023] Open
Abstract
Background Cephalosporins are used as first-line antimicrobial prophylaxis for orthopedics surgeries. However, alternative antibiotics are usually used in the presence of penicillin allergy (PA), which might increase the risk of surgical site infection (SSI). This study aimed to analyze the relationship between SSI after orthopedic surgeries and PA among surgical candidates and related alternative antibiotic use. Methods In this single-center retrospective cohort study, we compared inpatients with and without PA from January 2015 to December 2021. The primary outcome was SSI, and the secondary outcomes were SSI sites and perioperative antibiotic use. Moreover, pathogen characteristics of all SSIs were also compared between the two cohorts. Results Among the 20,022 inpatient records, 1704 (8.51%) were identified with PA, and a total of 111 (0.55%) SSI incidents were reported. Compared to patients without PA, patients with PA had higher postoperative SSI risk (1.06%, 18/1704 vs. 0.51%, 93/18318), shown both in multivariable regression analysis (odds ratio [OR] 2.11; 95% confidence interval [CI], 1.26-3.50; p= 0.004) and propensity score matching (OR 1.84; 95% CI, 1.05-3.23; p= 0.034). PA was related to elevated deep SSI risk (OR 2.79; 95% CI, 1.47-5.30; p= 0.002) and had no significant impact on superficial SSI (OR 1.39; 95% CI, 0.59-3.29; p= 0.449). The PA group used significantly more alternative antibiotics. Complete mediation effect of alternative antibiotics on SSI among these patients was found in mediation analysis. Pathogen analysis revealed gram-positive cocci as the most common pathogen for SSI in our study cohort, while patients with PA had higher infection rate from gram-positive rods and gram-negative rods than non-PA group. Conclusion Compared to patients without PA, patients with PA developed more SSI after orthopedic surgeries, especially deep SSI. The elevated infection rate could be secondary to the use of alternative prophylactic antibiotics.
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Affiliation(s)
- Tong Niu
- Department of Orthopedics, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China
| | - Yuelun Zhang
- Medical Research Centre, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China
| | - Ziquan Li
- Department of Orthopedics, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China
| | - Yanyan Bian
- Department of Orthopedics, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China
| | - Jianguo Zhang
- Department of Orthopedics, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China
| | - Yipeng Wang
- Department of Orthopedics, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China
- *Correspondence: Yipeng Wang,
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Davar K, Clark D, Centor RM, Dominguez F, Ghanem B, Lee R, Lee TC, McDonald EG, Phillips MC, Sendi P, Spellberg B. Can the Future of ID Escape the Inertial Dogma of Its Past? The Exemplars of Shorter Is Better and Oral Is the New IV. Open Forum Infect Dis 2022; 10:ofac706. [PMID: 36694838 PMCID: PMC9853939 DOI: 10.1093/ofid/ofac706] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Accepted: 12/28/2022] [Indexed: 12/31/2022] Open
Abstract
Like all fields of medicine, Infectious Diseases is rife with dogma that underpins much clinical practice. In this study, we discuss 2 specific examples of historical practice that have been overturned recently by numerous prospective studies: traditional durations of antimicrobial therapy and the necessity of intravenous (IV)-only therapy for specific infectious syndromes. These dogmas are based on uncontrolled case series from >50 years ago, amplified by the opinions of eminent experts. In contrast, more than 120 modern, randomized controlled trials have established that shorter durations of therapy are equally effective for many infections. Furthermore, 21 concordant randomized controlled trials have demonstrated that oral antibiotic therapy is at least as effective as IV-only therapy for osteomyelitis, bacteremia, and endocarditis. Nevertheless, practitioners in many clinical settings remain refractory to adopting these changes. It is time for Infectious Diseases to move beyond its history of eminent opinion-based medicine and truly into the era of evidenced-based medicine.
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Affiliation(s)
- Kusha Davar
- Los Angeles County + University of Southern California (LAC+USC) Medical Center, Los Angeles, California, USA
| | - Devin Clark
- Los Angeles County + University of Southern California (LAC+USC) Medical Center, Los Angeles, California, USA
| | - Robert M Centor
- Department of Medicine, Birmingham Veterans Affairs (VA) Medical Center, Birmingham, Alabama, Birmingham, Alabama, USA
| | - Fernando Dominguez
- Los Angeles County + University of Southern California (LAC+USC) Medical Center, Los Angeles, California, USA
| | | | - Rachael Lee
- Department of Medicine, Division of Infectious Diseases, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Todd C Lee
- Division of Infectious Diseases, Department of Medicine, McGill University, Montreal, Canada
| | - Emily G McDonald
- Division of General Internal Medicine, Department of Medicine, McGill University, Montreal, Quebec, Canada
| | - Matthew C Phillips
- Division of Infectious Diseases, Department of Medicine, Massachusetts General Hospital, Boston, Massachusetts, USA,Harvard Medical School, Boston, Massachusetts, USA
| | - Parham Sendi
- Institute for Infectious Diseases, University of Bern, Bern, Switzerland
| | - Brad Spellberg
- Correspondence: Brad Spellberg, MD, Hospital Administration, 2051 Marengo Street, Los Angeles, CA 90033 ()
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Haddad N, Carr M, Balian S, Lannin J, Kim Y, Toth C, Jarvis J. The Blood-Brain Barrier and Pharmacokinetic/Pharmacodynamic Optimization of Antibiotics for the Treatment of Central Nervous System Infections in Adults. Antibiotics (Basel) 2022; 11:antibiotics11121843. [PMID: 36551500 PMCID: PMC9774927 DOI: 10.3390/antibiotics11121843] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2022] [Revised: 12/08/2022] [Accepted: 12/14/2022] [Indexed: 12/24/2022] Open
Abstract
Bacterial central nervous system (CNS) infections are serious and carry significant morbidity and mortality. They encompass many syndromes, the most common being meningitis, which may occur spontaneously or as a consequence of neurosurgical procedures. Many classes of antimicrobials are in clinical use for therapy of CNS infections, some with established roles and indications, others with experimental reporting based on case studies or small series. This review delves into the specifics of the commonly utilized antibacterial agents, updating their therapeutic use in CNS infections from the pharmacokinetic and pharmacodynamic perspectives, with a focus on the optimization of dosing and route of administration that have been described to achieve good clinical outcomes. We also provide a concise synopsis regarding the most focused, clinically relevant information as pertains to each class and subclass of antimicrobial therapeutics. CNS infection morbidity and mortality remain high, and aggressive management is critical in ensuring favorable patient outcomes while averting toxicity and upholding patient safety.
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Affiliation(s)
- Nicholas Haddad
- College of Medicine, Central Michigan University (CMU), Mt Pleasant, MI 48859, USA
- Correspondence: ; Tel.: +1-(989)-746-7860
| | | | - Steve Balian
- CMU Medical Education Partners, Saginaw, MI 48602, USA
| | | | - Yuri Kim
- CMU Medical Education Partners, Saginaw, MI 48602, USA
| | - Courtney Toth
- Ascension St. Mary’s Hospital, Saginaw, MI 48601, USA
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Multidirectional Characterization of Phytochemical Profile and Health-Promoting Effects of Ziziphora bungeana Juz. Extracts. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27248994. [PMID: 36558125 PMCID: PMC9788533 DOI: 10.3390/molecules27248994] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Revised: 12/09/2022] [Accepted: 12/11/2022] [Indexed: 12/24/2022]
Abstract
Ziziphora species (Lamiaceae) have been used in traditional medicine as sedatives, antiseptics, carminatives, or expectorants. Despite their common applications in phytotherapy, there is still lack of evidence about the composition of their extracts and its impact on biological properties of the plants. The aim of this study was to evaluate the content of Ziziphora bungeana, a less studied species growing in Kazakhstan, using HPLC-ESI-QTOF-MS/MS instrumentation and to determine its antimicrobial, antioxidant, and cytotoxic activity together with inhibitory properties against tyrosinase and toxicity in erythrocyte lysis assay. Extracts from Z. bungeana were found to be sources of flavonoids, phenolic acids, organic acids, and terpenes that determined their antiradical activity. The minimum inhibitory concentrations of extracts were lower for Gram-positive bacteria (1.25-10 mg/mL) than for Gram-negative bacteria and fungi (5-20 mg/mL). The EC50 value calculated for antiradical activity ranged between 15.00 ± 1.06 µg/mL and 13.21 ± 3.24 µg/mL for ABTS and DPPH assays, respectively. Z. bungeana extracts were found to decrease the activity of tyrosinase by 50% (at 200 µg/mL) similarly to kojic acid and were slightly cytotoxic for human melanoma A375 cell line (at 200 µg/mL) with no effect on HaCaT keratinocytes. In the end, Z. bungeana did not reveal toxic effects in hemolytic assay as compared to the positive control Triton X-100. The performed tests show potential application of the plant in the treatment of infectious diseases, disorders caused by free radicals, and skin problems.
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Alffenaar JWC, de Steenwinkel JEM, Diacon AH, Simonsson USH, Srivastava S, Wicha SG. Pharmacokinetics and pharmacodynamics of anti-tuberculosis drugs: An evaluation of in vitro, in vivo methodologies and human studies. Front Pharmacol 2022; 13:1063453. [PMID: 36569287 PMCID: PMC9780293 DOI: 10.3389/fphar.2022.1063453] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2022] [Accepted: 11/22/2022] [Indexed: 12/13/2022] Open
Abstract
There has been an increased interest in pharmacokinetics and pharmacodynamics (PKPD) of anti-tuberculosis drugs. A better understanding of the relationship between drug exposure, antimicrobial kill and acquired drug resistance is essential not only to optimize current treatment regimens but also to design appropriately dosed regimens with new anti-tuberculosis drugs. Although the interest in PKPD has resulted in an increased number of studies, the actual bench-to-bedside translation is somewhat limited. One of the reasons could be differences in methodologies and outcome assessments that makes it difficult to compare the studies. In this paper we summarize most relevant in vitro, in vivo, in silico and human PKPD studies performed to optimize the drug dose and regimens for treatment of tuberculosis. The in vitro assessment focuses on MIC determination, static time-kill kinetics, and dynamic hollow fibre infection models to investigate acquisition of resistance and killing of Mycobacterium tuberculosis populations in various metabolic states. The in vivo assessment focuses on the various animal models, routes of infection, PK at the site of infection, PD read-outs, biomarkers and differences in treatment outcome evaluation (relapse and death). For human PKPD we focus on early bactericidal activity studies and inclusion of PK and therapeutic drug monitoring in clinical trials. Modelling and simulation approaches that are used to evaluate and link the different data types will be discussed. We also describe the concept of different studies, study design, importance of uniform reporting including microbiological and clinical outcome assessments, and modelling approaches. We aim to encourage researchers to consider methods of assessing and reporting PKPD of anti-tuberculosis drugs when designing studies. This will improve appropriate comparison between studies and accelerate the progress in the field.
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Affiliation(s)
- Jan-Willem C. Alffenaar
- Sydney Institute for Infectious Diseases, The University of Sydney, Sydney, NSW, Australia,School of Pharmacy, The University of Sydney Faculty of Medicine and Health, Sydney, NSW, Australia,Westmead Hospital, Sydney, NSW, Australia,*Correspondence: Jan-Willem C. Alffenaar,
| | | | | | | | - Shashikant Srivastava
- Department of Pulmonary Immunology, University of Texas Health Science Center at Tyler, Tyler, TX, United States
| | - Sebastian G. Wicha
- Department of Clinical Pharmacy, Institute of Pharmacy, University of Hamburg, Hamburg, Germany
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Álvarez-Santos N, Estrella-Parra EA, Benítez-Flores JDC, Serrano-Parrales R, Villamar-Duque TE, Santiago-Santiago MA, González-Valle MDR, Avila-Acevedo JG, García-Bores AM. Asterohyptis stellulata: Phytochemistry and wound healing activity. FOOD BIOSCI 2022. [DOI: 10.1016/j.fbio.2022.102150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Singh A, Zhao X, Drlica K. Fluoroquinolone heteroresistance, antimicrobial tolerance, and lethality enhancement. Front Cell Infect Microbiol 2022; 12:938032. [PMID: 36250047 PMCID: PMC9559723 DOI: 10.3389/fcimb.2022.938032] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2022] [Accepted: 07/21/2022] [Indexed: 11/13/2022] Open
Abstract
With tuberculosis, the emergence of fluoroquinolone resistance erodes the ability of treatment to interrupt the progression of MDR-TB to XDR-TB. One way to reduce the emergence of resistance is to identify heteroresistant infections in which subpopulations of resistant mutants are likely to expand and make the infections fully resistant: treatment modification can be instituted to suppress mutant enrichment. Rapid DNA-based detection methods exploit the finding that fluoroquinolone-resistant substitutions occur largely in a few codons of DNA gyrase. A second approach for restricting the emergence of resistance involves understanding fluoroquinolone lethality through studies of antimicrobial tolerance, a condition in which bacteria fail to be killed even though their growth is blocked by lethal agents. Studies with Escherichia coli guide work with Mycobacterium tuberculosis. Lethal action, which is mechanistically distinct from blocking growth, is associated with a surge in respiration and reactive oxygen species (ROS). Mutations in carbohydrate metabolism that attenuate ROS accumulation create pan-tolerance to antimicrobials, disinfectants, and environmental stressors. These observations indicate the existence of a general death pathway with respect to stressors. M. tuberculosis displays a variation on the death pathway idea, as stress-induced ROS is generated by NADH-mediated reductive stress rather than by respiration. A third approach, which emerges from lethality studies, uses a small molecule, N-acetyl cysteine, to artificially increase respiration and additional ROS accumulation. That enhances moxifloxacin lethality with M. tuberculosis in culture, during infection of cultured macrophages, and with infection of mice. Addition of ROS stimulators to fluoroquinolone treatment of tuberculosis constitutes a new direction for suppressing the transition of MDR-TB to XDR-TB.
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Affiliation(s)
- Amit Singh
- Department of Microbiology and Cell Biology, Indian Institute of Science, Bangalore, India
- Centre for Infectious Disease Research, Indian Institute of Science, Bangalore, India
- *Correspondence: Amit Singh, ; Karl Drlica,
| | - Xilin Zhao
- Public Health Research Institute and Department of Microbiology, Biochemistry and Molecular Genetics, New Jersey Medical School, Rutgers Biomedical and Health Sciences, Rutgers University, Newark, NJ, United States
- State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, School of Public Health, Xiamen University, Xiamen, China
| | - Karl Drlica
- Public Health Research Institute and Department of Microbiology, Biochemistry and Molecular Genetics, New Jersey Medical School, Rutgers Biomedical and Health Sciences, Rutgers University, Newark, NJ, United States
- *Correspondence: Amit Singh, ; Karl Drlica,
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Rational Discovery of Antimicrobial Peptides by Means of Artificial Intelligence. MEMBRANES 2022; 12:membranes12070708. [PMID: 35877911 PMCID: PMC9320227 DOI: 10.3390/membranes12070708] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Revised: 07/05/2022] [Accepted: 07/06/2022] [Indexed: 11/16/2022]
Abstract
Antibiotic resistance is a worldwide public health problem due to the costs and mortality rates it generates. However, the large pharmaceutical industries have stopped searching for new antibiotics because of their low profitability, given the rapid replacement rates imposed by the increasingly observed resistance acquired by microorganisms. Alternatively, antimicrobial peptides (AMPs) have emerged as potent molecules with a much lower rate of resistance generation. The discovery of these peptides is carried out through extensive in vitro screenings of either rational or non-rational libraries. These processes are tedious and expensive and generate only a few AMP candidates, most of which fail to show the required activity and physicochemical properties for practical applications. This work proposes implementing an artificial intelligence algorithm to reduce the required experimentation and increase the efficiency of high-activity AMP discovery. Our deep learning (DL) model, called AMPs-Net, outperforms the state-of-the-art method by 8.8% in average precision. Furthermore, it is highly accurate to predict the antibacterial and antiviral capacity of a large number of AMPs. Our search led to identifying two unreported antimicrobial motifs and two novel antimicrobial peptides related to them. Moreover, by coupling DL with molecular dynamics (MD) simulations, we were able to find a multifunctional peptide with promising therapeutic effects. Our work validates our previously proposed pipeline for a more efficient rational discovery of novel AMPs.
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Mohammadi F, Gholami A, Omidifar N, Amini A, Kianpour S, Taghizadeh SM. The potential of surface nano-engineering in characteristics of cobalt-based nanoparticles and biointerface interaction with prokaryotic and human cells. Colloids Surf B Biointerfaces 2022; 215:112485. [PMID: 35367746 DOI: 10.1016/j.colsurfb.2022.112485] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Revised: 03/01/2022] [Accepted: 03/24/2022] [Indexed: 01/07/2023]
Abstract
Cobalt-based nanoparticles (CBNPs) have recently received great attention in biomedical studies; however, the possible biotoxicity of these nanoparticles (NPs) has remained a foremost concern that should be addressed. As surface functionalization is one of the helpful proposed solutions, we aimed to apply Lipoamino acids (LAAs) as a coating agent to improve biocompatibility. To this purpose, cobalt oxide, cobalt ferrite, and iron oxide nanoparticles (IONs) were synthesized with and without 2-amino-hexadecanoic acid coating to assess the impacts of LAA coating on characteristics and biocompatibility of CBNPs in human cells and compare with IONs, a widely used magnetic NPs in biomedicine. Antibacterial activities of NPs were evaluated against four Gram-negative and Gram-positive bacteria species to assess their biointerface interaction with prokaryotic cells. In addition, the antibacterial activities of synthesized NPs were compared to silver NPs, one of the widely used antimicrobial NPs and standard antibiotics (ampicillin). The structural characteristics properties of NPs were analyzed using TEM, FE-SEM, EDS, FTIR, XRD, and VSM. These NPs exhibited sphere-like to polygon-like morphology with desirable mean size. CBNPs displayed dose-dependent cytotoxicity and antimicrobial activities against human cell lines and all tested microbial species, as well as more cytotoxicity and bacterial inhibition compared to IONs. Besides, the results revealed that LAA coating could significantly improve the biocompatibility and antibacterial activity of NPs while impacting magnetic properties. To sum up, it seems that surface functionalization could provide more potent tools for bioapplications with improving biocompatibility and bacterial inhibition of CBNPs, though; further studies are needed in this regard.
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Affiliation(s)
- Fatemeh Mohammadi
- Biotechnology Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Ahmad Gholami
- Pharmaceutical Sciences Research Center, Shiraz University of Medical Sciences, Shiraz, Iran; Department of Pharmaceutical Biotechnology, School of Pharmacy, Shiraz University of Medical Sciences, Shiraz, Iran.
| | - Navid Omidifar
- Biotechnology Research Center, Shiraz University of Medical Sciences, Shiraz, Iran; Department of Pathology, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Abbas Amini
- Centre for Infrastructure Engineering, Western Sydney University, Penrith 2751, NSW, Australia; Department of Mechanical Engineering, Australian University-Kuwait, Mishref, Safat 13015, Kuwait
| | - Sedigheh Kianpour
- Pharmaceutical Sciences Research Center, Shiraz University of Medical Sciences, Shiraz, Iran; Biotechnology Incubator, Shiraz University of Medical Sciences, Shiraz, Iran
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Rose W, Volk C, Dilworth TJ, Sakoulas G. Approaching 65 Years: Is it Time to Consider Retirement of Vancomycin for Treating Methicillin-Resistant Staphylococcus aureus Endovascular Infections? Open Forum Infect Dis 2022; 9:ofac137. [PMID: 35493116 PMCID: PMC9043000 DOI: 10.1093/ofid/ofac137] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2022] [Accepted: 03/17/2022] [Indexed: 11/21/2022] Open
Abstract
Vancomycin was introduced nearly 65 years ago and remains the standard antibiotic for serious methicillin-resistant Staphylococcus aureus (MRSA) infections. Staphylococcus aureus remains highly susceptibility to vancomycin (>97%). Despite this, MRSA treatment failure with vancomycin is high in complicated bacteremia. Additionally, vancomycin can cause nephrotoxicity, leading to new therapeutic drug monitoring guidance. This demonstrates how difficult it is to dose vancomycin in a way that is both efficacious and safe, especially during long courses of therapy. Often underappreciated are the cost, resources, and complexity of vancomycin care at a time when alternative antibiotics are becoming cost comparable. This perspective highlights a bigger picture of how the treatment repertoires of many other diseases have changed and advanced since vancomycin’s introduction in the 1950s, yet the vancomycin MRSA treatment standard remains. While vancomycin can still have a role, 65 years may be a practical retirement age for vancomycin in highly complex endovascular infections.
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Affiliation(s)
- Warren Rose
- School of Pharmacy, University of Wisconsin-Madison, Madison, WI, USA
| | - Cecilia Volk
- School of Pharmacy, University of Wisconsin-Madison, Madison, WI, USA
| | - Thomas J Dilworth
- Department of Pharmacy Services, Advocate Aurora Health, Milwaukee, WI, USA
| | - George Sakoulas
- Division of Host-Microbe Systems & Therapeutics, Center for Immunity, Infection & Inflammation, University of California-San Diego School of Medicine, La Jolla, CA, USA
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Essential Oils and Hydrolates: Potential Tools for Defense against Bacterial Plant Pathogens. Microorganisms 2022; 10:microorganisms10040702. [PMID: 35456755 PMCID: PMC9031397 DOI: 10.3390/microorganisms10040702] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Revised: 03/16/2022] [Accepted: 03/21/2022] [Indexed: 02/04/2023] Open
Abstract
The essential oils (EOs) of Origanum compactum and Satureja montana chemotyped (CT) at carvacrol, two Thymus vulgaris CT at thujanol and thymol, and Hydrolates (Hys) of S. montana and Citrus aurantium var. amara were chosen for studying their bactericidal efficacy against few phytobacterial pathogens. The Minimal Inhibitory Concentration (MIC) and Bactericidal Concentration (MBC) were found by microdilution assay. The essential oils of O. compactum (MBC 0.06% v/v), T. vulgaris CT thymol (MBC 0.06% v/v), and Hy of C. aurantium (MBC 6.25% v/v) resulted in being the most effective against Erwinia amylovora; thus, they were used as starting concentrations for ex vivo assays. Despite the great in vitro effectiveness, the disease incidence and the population dynamic ex vivo assays showed no significant results. On the other hand, EO of O. compactum and Hy of C. aurantium (at 0.03% and 4.5% v/v, respectively) showed resistance induction in tomato plants against Xanthomonas vesicatoria infections; both treatments resulted in approximately 50% protection. In conclusion, EOs and Hys could be promising tools for agricultural defense, but further studies will be necessary to stabilize the EOs emulsions, while Hys application could be an effective method to prevent bacterial diseases when used as resistance inducer by pre-transplantation treatment at roots.
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Lopez-Luis BA, Ponce-De-León A, Ortiz-Brizuela E, Lambraño-Castillo D, Leal-Vega FJ, Tovar-Calderón YE, Bobadilla-Del-Valle M, Sifuentes-Osornio J. Risk Factors Associated with Failure of Linezolid Therapy in Vancomycin-Resistant Enterococcus faecium Bacteremia: A Retrospective Cohort Study in a Referral Center in Mexico. Microb Drug Resist 2022; 28:744-749. [PMID: 35333619 DOI: 10.1089/mdr.2021.0333] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
We aimed to assess the factors associated with 30-day mortality in patients with vancomycin-resistant Enterococcus faecium (VREf) bloodstream infection (BSI) who received treatment with linezolid in an 11-year retrospective cohort of patients with VREf BSI. A univariate and stepwise multivariate logistic regression analysis was performed to determine 30-day mortality factors. Moreover, a Cox proportional hazards analysis of predictor covariates of mortality was performed. Eighty patients were included in the final analysis; 42 (53%) died and 38 (47%) survived 30 days after the index bacteremia. Thirteen patients of 42 (31%) died in the first 7 days. The Acute Physiology and Chronic Health Evaluation II (APACHE II) score was significantly associated with 30-day mortality (adjusted odds ratio [aOR], 1.46; 95% confidence interval [CI]: 1.22-1.76; p < 0.001) in the multivariate analysis. Moreover, VREf BSI persisting for more than 48 hours was a strong factor related to 30-day mortality (aOR, 19.6; 95% CI: 1.46-263; p = 0.01). Adequate control of infection source showed a trend to be protective without reaching significance in the multivariate analysis (aOR, 0.19; 95% CI: 0.04-1.0; p = 0.05). The Cox proportional hazards analysis confirmed the same significant mortality predictor besides linezolid treatment within the first 48 hours as a protective factor (hazard ratio 0.46; 95% CI: 0.23-0.92, p = 0.02). Severely ill patients with high APACHE II score and persistent bacteremia have a higher risk of failure with linezolid therapy.
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Affiliation(s)
- Bruno Ali Lopez-Luis
- Laboratory of Clinical Microbiology, Department of Infectious Diseases, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico
| | - Alfredo Ponce-De-León
- Laboratory of Clinical Microbiology, Department of Infectious Diseases, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico
| | - Edgar Ortiz-Brizuela
- Laboratory of Clinical Microbiology, Department of Infectious Diseases, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico
| | - Darwin Lambraño-Castillo
- Laboratory of Clinical Microbiology, Department of Infectious Diseases, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico
| | - Francisco Javier Leal-Vega
- Laboratory of Clinical Microbiology, Department of Infectious Diseases, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico
| | - Yanet Estrella Tovar-Calderón
- Laboratory of Clinical Microbiology, Department of Infectious Diseases, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico
| | - Miriam Bobadilla-Del-Valle
- Laboratory of Clinical Microbiology, Department of Infectious Diseases, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico
| | - José Sifuentes-Osornio
- Department of Medicine, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico
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In search for a synergistic combination against pandrug-resistant A. baumannii; methodological considerations. Infection 2022; 50:569-581. [PMID: 34982411 DOI: 10.1007/s15010-021-01748-w] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2021] [Accepted: 12/18/2021] [Indexed: 01/07/2023]
Abstract
PURPOSE Pending approval of new antimicrobials, synergistic combinations are the only treatment option against pandrug-resistant A. baumannii (PDRAB). Considering the lack of a standardized methodology, the aim of this manuscript is to systematically review the methodology and discuss unique considerations for assessing antimicrobial combinations against PDRAB. METHODS Post-hoc analysis of a systematic review (conducted in PubMed and Scopus from inception to April 2021) of studies evaluating antimicrobial combination against A. baumannii, based on antimicrobials that are inactive in vitro alone. RESULTS Eighty-four publications were reviewed, using a variety of synergy testing methods, including; gradient-based methods (n = 11), disk-based methods (n = 6), agar dilution (n = 2), checkerboard assay (n = 44), time-kill assay (n = 50), dynamic in vitro PK/PD models (n = 6), semi-mechanistic PK/PD models (n = 5), and in vivo animal models (n = 11). Several variations in definitions of synergy and interpretation of each method were observed and are discussed. Challenges related to testing combinations of antimicrobials that are inactive alone (with regards to concentrations at which the combinations are assessed), as well as other considerations (assessment of stasis vs killing, clinical relevance of re-growth in vitro after initial killing, role of in vitro vs in vivo conditions, challenges of clinical testing of antimicrobial combinations against PDRAB infections) are discussed. CONCLUSION This review demonstrates the need for consensus on a standardized methodology and clinically relevant definitions for synergy. Modifications in the methodology and definitions of synergy as well as a roadmap for further development of antimicrobial combinations against PDRAB are proposed.
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Saleem N, Ryckaert F, Chandos Snow TA, Satta G, Singer M, Arulkumaran N. Mortality and clinical cure rates for pneumonia: A systematic review, meta-analysis, and trial sequential analysis of randomized control trials comparing bactericidal and bacteriostatic antibiotic treatments. Clin Microbiol Infect 2022; 28:936-945. [DOI: 10.1016/j.cmi.2021.12.021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Revised: 12/07/2021] [Accepted: 12/25/2021] [Indexed: 11/03/2022]
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Lim JW, Jo YH, Choi JS, Lee MK, Lee KY, Kang SY. Antibacterial Activities of Prenylated Isoflavones from Maclura tricuspidata against Fish Pathogenic Streptococcus: Their Structure-Activity Relationships and Extraction Optimization. Molecules 2021; 26:molecules26247451. [PMID: 34946533 PMCID: PMC8704674 DOI: 10.3390/molecules26247451] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2021] [Revised: 12/01/2021] [Accepted: 12/07/2021] [Indexed: 11/30/2022] Open
Abstract
Streptococcus zoonotic bacteria cause serious problems in aquaculture with clinical effects on humans. A structure-antibacterial activity relationships analysis of 22 isoflavones isolated from M. tricuspidata (leaves, ripe fruits, and unripe fruits) against S. iniae revealed that prenylation of the isoflavone skeleton was an important key for their antibacterial activities (minimum inhibitory concentrations: 1.95–500 μg/mL). Through principal component analysis, characteristic prenylated isoflavones such as 6,8-diprenlygenistein (4) were identified as pivotal compounds that largely determine each part’s antibacterial activities. M. tiricuspidata ripe fruits (MTF), which showed the highest antibacterial activity among the parts tested, were optimized for high antibacterial activity and low cytotoxicity on fathead minnow cells using Box–Behnken design. Optimized extraction conditions were deduced to be 50%/80 °C/7.5 h for ethanol concentration/extraction temperature/time, and OE-MTF showed contents of 6,8-diprenlygenistein (4), 2.09% with a MIC of 40 µg/mL. These results suggest that OE-MTF and its active isoflavones have promising potential as eco-friendly antibacterial agents against streptococcosis in aquaculture.
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Affiliation(s)
- Jae-Woong Lim
- Department of Aqualife Medicine, Chonnam National University, Yeosu 59626, Korea; (J.-W.L.); (J.-S.C.)
| | - Yang Hee Jo
- College of Pharmacy, Chungbuk National University, Cheongju 28160, Korea; (Y.H.J.); (M.K.L.)
| | - Ji-Seok Choi
- Department of Aqualife Medicine, Chonnam National University, Yeosu 59626, Korea; (J.-W.L.); (J.-S.C.)
| | - Mi Kyeong Lee
- College of Pharmacy, Chungbuk National University, Cheongju 28160, Korea; (Y.H.J.); (M.K.L.)
| | - Ki Yong Lee
- College of Pharmacy, Korea University, Sejong 30019, Korea;
| | - So Young Kang
- Department of Aqualife Medicine, Chonnam National University, Yeosu 59626, Korea; (J.-W.L.); (J.-S.C.)
- Correspondence: ; Tel./Fax: +82-61-659-7176
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Harrower J, McNaughtan M, Hunter C, Hough R, Zhang Z, Helwig K. Chemical Fate and Partitioning Behavior of Antibiotics in the Aquatic Environment-A Review. ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY 2021; 40:3275-3298. [PMID: 34379810 DOI: 10.1002/etc.5191] [Citation(s) in RCA: 51] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Revised: 04/23/2021] [Accepted: 08/06/2021] [Indexed: 06/13/2023]
Abstract
Antibiotics in the aquatic environment is a major problem because of the emergence of antibiotic resistance. The long-term ecological impact on the aquatic environment is unknown. Many sources allow entry of antibiotics into the environment, including wastewater-treatment plants (WWTPs), agricultural runoff, hospital effluent, and landfill leachate. Concentrations of antibiotics in the aquatic environment vary significantly; studies have shown fluoroquinolones, tetracycline, macrolides, sulfonamides, and penicillins to reach 2900, 1500, 9700, 21 400, and 1600 ng L-1 in wastewater effluent samples, respectively. However, concentrations are highly variable between different countries and depend on several factors including seasonal variation, prescription, and WWTP operating procedures. Likewise, the reported concentrations that cause environmental effects vary greatly between antibiotics, even within the same class; however, this predicted concentration for the antibiotics considered was frequently <1000 ngL-1 , indicating that when discharged into the environment along with treated effluent, these antibiotics have a potentially detrimental effect on the environment. Antibiotics are generally quite hydrophilic in nature; however, they can ionize in the aquatic environment to form charged structures, such as cations, zwitterions, and anions. Certain classes, particularly fluoroquinolones and tetracyclines, can adsorb onto solid matrices, including soils, sediment, and sludge, making it difficult to fully understand their chemical fate in the aquatic environment. The adsorption coefficient (Kd ) varies between different classes of antibiotics, with tetracyclines and fluoroquinolones showing the highest Kd values. The Kd values for fluoroquinolones, tetracyclines, macrolides, and sulfonamides have been reported as 54 600, 7600, 130, and 1.37 L kg-1 , respectively. Factors such as pH of the environment, solid matrix (sediment/soil sludge), and ionic strength can influence the Kd ; therefore, several values exist in literature for the same compound. Environ Toxicol Chem 2021;40:3275-3298. © 2021 SETAC.
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Affiliation(s)
- Jamie Harrower
- Glasgow Caledonian University, Cowcaddens Road, Glasgow G4 0BA, Scotland, United Kingdom
- The James Hutton Institute, Cragiebuckler, Aberdeen AB15 8QH, Scotland, United Kingdom
| | - Moyra McNaughtan
- Glasgow Caledonian University, Cowcaddens Road, Glasgow G4 0BA, Scotland, United Kingdom
| | - Colin Hunter
- Glasgow Caledonian University, Cowcaddens Road, Glasgow G4 0BA, Scotland, United Kingdom
| | - Rupert Hough
- The James Hutton Institute, Cragiebuckler, Aberdeen AB15 8QH, Scotland, United Kingdom
| | - Zulin Zhang
- The James Hutton Institute, Cragiebuckler, Aberdeen AB15 8QH, Scotland, United Kingdom
| | - Karin Helwig
- Glasgow Caledonian University, Cowcaddens Road, Glasgow G4 0BA, Scotland, United Kingdom
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42
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Tinévez C, Velardo F, Ranc AG, Dubois D, Pailhoriès H, Codde C, Join-Lambert O, Gras E, Corvec S, Neuwirth C, Melenotte C, Dorel M, Lagneaux AS, Pichon M, Doat V, Fournier D, Lemaignen A, Bouard L, Patoz P, Hery-Arnaud G, Lemaitre N, Couzigou C, Guillard T, Recalt E, Bille E, Belaroussi Y, Neau D, Cazanave C, Lehours P, Puges M. Retrospective multicentric study on Campylobacter spp. bacteremia in France: the Campylobacteremia study. Clin Infect Dis 2021; 75:702-709. [PMID: 34849656 DOI: 10.1093/cid/ciab983] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2021] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Campylobacter spp. bacteremia is a severe infection. A nationwide 5-year retrospective study was conducted to characterize its clinical features and prognostic factors. METHODS Patients diagnosed with Campylobacter spp. bacteremia in 37 French hospitals participating in the surveillance network of the National Reference Center for Campylobacter and Helicobacter were included from January 1, 2015, to December 31, 2019. The goal was to analyze the effects of a delay of appropriate antibiotic therapy and other risk factors on 30-day mortality, antibiotic resistance, patient characteristics and prognosis according to the Campylobacter species. FINDINGS Among the 592 patients, Campylobacter jejuni and Campylobacter fetus were the most commonly identified species (42.9 and 42.6%, respectively). The patients were elderly (median age 68 years), and most had underlying conditions, mainly immunodepression (43.4%), hematologic malignancies (25.9%), solid neoplasms (23%) and diabetes (22.3%). C. jejuni and Campylobacter coli were associated with gastrointestinal signs, and C. fetus was associated with secondary localizations. Among the 80 patients (13.5%) with secondary localizations, 12 had endocarditis, 38 vascular, 24 osteo-articular and 9 ascitic fluid infections. The thirty-day mortality rate was 11.7%, and an appropriate antibiotic treatment was independently associated with 30-day survival (odds ratio [OR]=0.47, 95% CI [0.24-0.93], p=0.03). The median efficient therapy initiation delay was quite short (2 days, IQR [0-4]) but it had no significant impact on 30-day mortality (p=0.78). INTERPRETATION Campylobacter spp. bacteremia mainly occurred in elderly immunocompromised individuals with variable clinical presentations according to the species involved. Appropriate antimicrobial therapy was associated with improved 30-day survival.
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Affiliation(s)
- Claire Tinévez
- CHU de Bordeaux, Infectious and Tropical Diseases Department, F-33000 Bordeaux, France
| | - Fanny Velardo
- INSERM, Bordeaux Population Health Research Center, ISPED, University of Bordeaux, F-33000 Bordeaux, France
| | - Anne-Gaëlle Ranc
- CHU de Lyon Sud, Bacteriology Department, F-69310 Pierre-Bénite, France
| | - Damien Dubois
- CHU de Toulouse, Bacteriology Department, F-31059 Toulouse, France
| | | | - Cyrielle Codde
- CHU de Limoges, Infectious and Tropical Diseases Department, F-87000 Limoges, France
| | | | - Emmanuelle Gras
- Hôpital Européen Georges-Pompidou, Infectious and Tropical Diseases Department, F-75015 Paris, France
| | - Stéphane Corvec
- CHU de Nantes, Bacteriology Department, F-44093 Nantes, France
| | | | - Cléa Melenotte
- CHU de Marseille, Bacteriology Department, F-13005 Marseille, France
| | - Marie Dorel
- CHU de Rennes, Infectious Diseases and Intensive Care Department, F-35033 Rennes, France
| | | | - Maxime Pichon
- CHU de Poitiers, Infectious Agents Department, Bacteriology, F-86021 Poitiers, France
| | - Violaine Doat
- CH Pierre Oudot, Biology Department, F-38300 Bourguoin-Jallieu, France
| | - Damien Fournier
- CHU de Besançon, Bacteriology Department, F-25000 Besançon, France
| | - Adrien Lemaignen
- CHRU de Tours, Infectious and Tropical Diseases Department, F-37000 Tours, France
| | - Leslie Bouard
- CHD Vendée, Biology Department, F-85000 La Roche-Sur-Yon, France
| | - Pierre Patoz
- CH de Tourcoing, Biology Department, F-59208 Tourcoing, France
| | | | - Nadine Lemaitre
- CHU d'Amiens, Bacteriology Department, F-80000 Amiens, France
| | | | - Thomas Guillard
- CHU de Reims, Bacteriology Department, F-51092 Reims, France
| | - Elise Recalt
- CHU de Strasbourg, Bacteriology Department, F-67200 Strasbourg, France
| | - Emmanuelle Bille
- CH Necker-Enfants malades, Bacteriology Department, F-75015 Paris, France
| | - Yaniss Belaroussi
- INSERM, Bordeaux Population Health Research Center, ISPED, University of Bordeaux, F-33000 Bordeaux, France
| | - Didier Neau
- CHU de Bordeaux, Infectious and Tropical Diseases Department, F-33000 Bordeaux, France
| | - Charles Cazanave
- CHU de Bordeaux, Infectious and Tropical Diseases Department, F-33000 Bordeaux, France
| | - Philippe Lehours
- CHU de Bordeaux, National Reference Center for Campylobacter and Helicobacter, Bacteriology Department, F-33000 Bordeaux, France.,Univ. Bordeaux, INSERM, UMR1053 Bordeaux Research in Translational Oncology, BaRITOn, 33076, Bordeaux, France
| | - Mathilde Puges
- CHU de Bordeaux, Infectious and Tropical Diseases Department, F-33000 Bordeaux, France
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Rodríguez-Baño J, Retamar P. Unneeded antibiotics for acute respiratory infections in primary care: stop as early as possible. Clin Microbiol Infect 2021; 28:147-148. [PMID: 34823010 DOI: 10.1016/j.cmi.2021.11.009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2021] [Accepted: 11/05/2021] [Indexed: 01/08/2023]
Affiliation(s)
- Jesús Rodríguez-Baño
- Unidad Clínica de Enfermedades Infecciosas y Microbiología, Hospital Universitario Virgen Macarena and Departamento de Medicina, Universidad de Sevilla/Instituto de Biomedicina de Sevilla, Spain; Centro de Investigación Biomédica en Red de Enfermedades Infecciosas (CIBERINFEC), Spain.
| | - Pilar Retamar
- Unidad Clínica de Enfermedades Infecciosas y Microbiología, Hospital Universitario Virgen Macarena and Departamento de Medicina, Universidad de Sevilla/Instituto de Biomedicina de Sevilla, Spain; Centro de Investigación Biomédica en Red de Enfermedades Infecciosas (CIBERINFEC), Spain
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44
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Blondeau JM, Fitch SD. In Vitro Killing of Canine Urinary Tract Infection Pathogens by Ampicillin, Cephalexin, Marbofloxacin, Pradofloxacin, and Trimethoprim/Sulfamethoxazole. Microorganisms 2021; 9:2279. [PMID: 34835405 PMCID: PMC8619264 DOI: 10.3390/microorganisms9112279] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2021] [Revised: 10/27/2021] [Accepted: 10/29/2021] [Indexed: 12/24/2022] Open
Abstract
Urinary tract infections are common in dogs, necessitating antimicrobial therapy. We determined the speed and extent of in vitro killing of canine urinary tract infection pathogens by five antimicrobial agents (ampicillin, cephalexin, marbofloxacin, pradofloxacin, and trimethoprim/sulfamethoxazole) following the first 3 h of drug exposure. Minimum inhibitory and mutant prevention drug concentrations were determined for each strain. In vitro killing was determined by exposing bacteria to clinically relevant drug concentrations and recording the log10 reduction and percent kill in viable cells at timed intervals. Marbofloxacin and pradofloxacin killed more bacterial cells, and faster than other agents, depending on the time of sampling and drug concentration. Significant differences were seen between drugs for killing Escherichia coli, Proteus mirabilis, Enterococcus faecalis, and Staphylococcus pseudintermedius strains. At the maximum urine drug concentrations, significantly more E. coli cells were killed by marbofloxacin than by ampicillin (p < 0.0001), cephalexin (p < 0.0001), and TMP/SMX (p < 0.0001) and by pradofloxacin than by cephalexin (p < 0.0001) and TMP/SMX (p < 0.0001), following 5 min of drug exposure. Rapid killing of bacteria should inform thinking on drug selection for short course therapy for uncomplicated UTIs, without compromising patient care, and is consistent with appropriate antimicrobial use and stewardship principles.
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Affiliation(s)
- Joseph M. Blondeau
- Departments of Microbiology and Immunology, Pathology and Laboratory Medicine and Ophthalmology, University of Saskatchewan, Saskatoon, SK S7N 0W8, Canada
- Department of Clinical Microbiology, Royal University Hospital and Saskatchewan Health Authority, Saskatoon, SK S7N 0W8, Canada;
| | - Shantelle D. Fitch
- Department of Clinical Microbiology, Royal University Hospital and Saskatchewan Health Authority, Saskatoon, SK S7N 0W8, Canada;
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45
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Maier L, Goemans CV, Wirbel J, Kuhn M, Eberl C, Pruteanu M, Müller P, Garcia-Santamarina S, Cacace E, Zhang B, Gekeler C, Banerjee T, Anderson EE, Milanese A, Löber U, Forslund SK, Patil KR, Zimmermann M, Stecher B, Zeller G, Bork P, Typas A. Unravelling the collateral damage of antibiotics on gut bacteria. Nature 2021; 599:120-124. [PMID: 34646011 PMCID: PMC7612847 DOI: 10.1038/s41586-021-03986-2] [Citation(s) in RCA: 133] [Impact Index Per Article: 44.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2019] [Accepted: 09/01/2021] [Indexed: 12/15/2022]
Abstract
Antibiotics are used to fight pathogens but also target commensal bacteria, disturbing the composition of gut microbiota and causing dysbiosis and disease1. Despite this well-known collateral damage, the activity spectrum of different antibiotic classes on gut bacteria remains poorly characterized. Here we characterize further 144 antibiotics from a previous screen of more than 1,000 drugs on 38 representative human gut microbiome species2. Antibiotic classes exhibited distinct inhibition spectra, including generation dependence for quinolones and phylogeny independence for β-lactams. Macrolides and tetracyclines, both prototypic bacteriostatic protein synthesis inhibitors, inhibited nearly all commensals tested but also killed several species. Killed bacteria were more readily eliminated from in vitro communities than those inhibited. This species-specific killing activity challenges the long-standing distinction between bactericidal and bacteriostatic antibiotic classes and provides a possible explanation for the strong effect of macrolides on animal3-5 and human6,7 gut microbiomes. To mitigate this collateral damage of macrolides and tetracyclines, we screened for drugs that specifically antagonized the antibiotic activity against abundant Bacteroides species but not against relevant pathogens. Such antidotes selectively protected Bacteroides species from erythromycin treatment in human-stool-derived communities and gnotobiotic mice. These findings illluminate the activity spectra of antibiotics in commensal bacteria and suggest strategies to circumvent their adverse effects on the gut microbiota.
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Affiliation(s)
- Lisa Maier
- Genome Biology Unit, European Molecular Biology Laboratory, Heidelberg, Germany.
- Interfaculty Institute of Microbiology and Infection Medicine, University of Tübingen, Tübingen, Germany.
- Cluster of Excellence 'Controlling Microbes to Fight Infections', University of Tübingen, Tübingen, Germany.
| | - Camille V Goemans
- Genome Biology Unit, European Molecular Biology Laboratory, Heidelberg, Germany
| | - Jakob Wirbel
- Structural and Computational Biology Unit, European Molecular Biology Laboratory, Heidelberg, Germany
| | - Michael Kuhn
- Structural and Computational Biology Unit, European Molecular Biology Laboratory, Heidelberg, Germany
| | - Claudia Eberl
- Max-von-Pettenkofer Institute, LMU Munich, Munich, Germany
- German Center for Infection Research (DZIF), partner site LMU Munich, Munich, Germany
| | - Mihaela Pruteanu
- Genome Biology Unit, European Molecular Biology Laboratory, Heidelberg, Germany
- Department of Biology, Humboldt University Berlin, Berlin, Germany
| | - Patrick Müller
- Interfaculty Institute of Microbiology and Infection Medicine, University of Tübingen, Tübingen, Germany
- Cluster of Excellence 'Controlling Microbes to Fight Infections', University of Tübingen, Tübingen, Germany
| | | | - Elisabetta Cacace
- Genome Biology Unit, European Molecular Biology Laboratory, Heidelberg, Germany
| | - Boyao Zhang
- Structural and Computational Biology Unit, European Molecular Biology Laboratory, Heidelberg, Germany
| | - Cordula Gekeler
- Interfaculty Institute of Microbiology and Infection Medicine, University of Tübingen, Tübingen, Germany
- Cluster of Excellence 'Controlling Microbes to Fight Infections', University of Tübingen, Tübingen, Germany
| | - Tisya Banerjee
- Genome Biology Unit, European Molecular Biology Laboratory, Heidelberg, Germany
- Department of Chemistry, TU Munich, Munich, Germany
| | - Exene Erin Anderson
- Genome Biology Unit, European Molecular Biology Laboratory, Heidelberg, Germany
- NYU School of Medicine, New York, NY, USA
| | - Alessio Milanese
- Structural and Computational Biology Unit, European Molecular Biology Laboratory, Heidelberg, Germany
| | - Ulrike Löber
- Experimental and Clinical Research Center, a cooperation of Charité - Universitätsmedizin Berlin and Max-Delbrück-Center for Molecular Medicine, Berlin, Germany
- Max-Delbrück-Center for Molecular Medicine, Berlin, Germany
| | - Sofia K Forslund
- Structural and Computational Biology Unit, European Molecular Biology Laboratory, Heidelberg, Germany
- Experimental and Clinical Research Center, a cooperation of Charité - Universitätsmedizin Berlin and Max-Delbrück-Center for Molecular Medicine, Berlin, Germany
- Max-Delbrück-Center for Molecular Medicine, Berlin, Germany
| | - Kiran Raosaheb Patil
- Structural and Computational Biology Unit, European Molecular Biology Laboratory, Heidelberg, Germany
- The Medical Research Council Toxicology Unit, University of Cambridge, Cambridge, UK
| | - Michael Zimmermann
- Structural and Computational Biology Unit, European Molecular Biology Laboratory, Heidelberg, Germany
| | - Bärbel Stecher
- Max-von-Pettenkofer Institute, LMU Munich, Munich, Germany
- German Center for Infection Research (DZIF), partner site LMU Munich, Munich, Germany
| | - Georg Zeller
- Structural and Computational Biology Unit, European Molecular Biology Laboratory, Heidelberg, Germany
| | - Peer Bork
- Structural and Computational Biology Unit, European Molecular Biology Laboratory, Heidelberg, Germany
- Max-Delbrück-Center for Molecular Medicine, Berlin, Germany
- Yonsei Frontier Lab (YFL), Yonsei University, Seoul, South Korea
- Department of Bioinformatics, Biocenter, University of Würzburg, Würzburg, Germany
| | - Athanasios Typas
- Genome Biology Unit, European Molecular Biology Laboratory, Heidelberg, Germany.
- Structural and Computational Biology Unit, European Molecular Biology Laboratory, Heidelberg, Germany.
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46
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Beam JE, Rowe SE, Conlon BP. Shooting yourself in the foot: How immune cells induce antibiotic tolerance in microbial pathogens. PLoS Pathog 2021; 17:e1009660. [PMID: 34293056 PMCID: PMC8297873 DOI: 10.1371/journal.ppat.1009660] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Antibiotic treatment failure of infection is common and frequently occurs in the absence of genetically encoded antibiotic resistance mechanisms. In such scenarios, the ability of bacteria to enter a phenotypic state that renders them tolerant to the killing activity of multiple antibiotic classes is thought to contribute to antibiotic failure. Phagocytic cells, which specialize in engulfing and destroying invading pathogens, may paradoxically contribute to antibiotic tolerance and treatment failure. Macrophages act as reservoirs for some pathogens and impede penetration of certain classes of antibiotics. In addition, increasing evidence suggests that subpopulations of bacteria can survive inside these cells and are coerced into an antibiotic-tolerant state by host cell activity. Uncovering the mechanisms that drive immune-mediated antibiotic tolerance may present novel strategies to improving antibiotic therapy.
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Affiliation(s)
- Jenna E. Beam
- Department of Microbiology and Immunology, University of North Carolina Chapel Hill, Chapel Hill, North Carolina, United States of America
| | - Sarah E. Rowe
- Department of Microbiology and Immunology, University of North Carolina Chapel Hill, Chapel Hill, North Carolina, United States of America
| | - Brian P. Conlon
- Department of Microbiology and Immunology, University of North Carolina Chapel Hill, Chapel Hill, North Carolina, United States of America
- * E-mail:
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47
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Jarczak D, Kluge S, Nierhaus A. Sepsis-Pathophysiology and Therapeutic Concepts. Front Med (Lausanne) 2021; 8:628302. [PMID: 34055825 PMCID: PMC8160230 DOI: 10.3389/fmed.2021.628302] [Citation(s) in RCA: 118] [Impact Index Per Article: 39.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2020] [Accepted: 04/09/2021] [Indexed: 12/12/2022] Open
Abstract
Sepsis is a life-threatening condition and a global disease burden. Today, the heterogeneous syndrome is defined as severe organ dysfunction caused by a dysregulated host response to infection, with renewed emphasis on immune pathophysiology. Despite all efforts of experimental and clinical research during the last three decades, the ability to positively influence course and outcome of the syndrome remains limited. Evidence-based therapy still consists of basic causal and supportive measures, while adjuvant interventions such as blood purification or targeted immunotherapy largely remain without proof of effectiveness so far. With this review, we aim to provide an overview of sepsis immune pathophysiology, to update the choice of therapeutic approaches targeting different immunological mechanisms in the course of sepsis and septic shock, and to call for a paradigm shift from the pathogen to the host response as a potentially more promising angle.
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Affiliation(s)
- Dominik Jarczak
- Department of Intensive Care Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Stefan Kluge
- Department of Intensive Care Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Axel Nierhaus
- Department of Intensive Care Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
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48
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Demir KK, Butler-Laporte G, Del Corpo O, Ekmekjian T, Sheppard DC, Lee TC, Cheng MP. Comparative effectiveness of amphotericin B, azoles and echinocandins in the treatment of candidemia and invasive candidiasis: A systematic review and network meta-analysis. Mycoses 2021; 64:1098-1110. [PMID: 33894072 DOI: 10.1111/myc.13290] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Revised: 04/11/2021] [Accepted: 04/14/2021] [Indexed: 12/14/2022]
Abstract
BACKGROUND + OBJECTIVES: The echinocandins, amphotericin B preparations, voriconazole and fluconazole are approved for the treatment of invasive candidiasis, though it remains unclear which agent is most effective. In order to answer this question, we performed a systematic review and network meta-analysis of the randomised controlled trials (RCTs) which evaluated these agents in comparison. METHODS Four electronic databases were searched from database inception to 8 October 2020. RCTs comparing triazoles, echinocandins or amphotericin B for the treatment of invasive candidiasis or candidemia were included. Random effect Bayesian network meta-analysis methods were used to compare treatment outcomes. RESULTS Thirteen RCTs met inclusion criteria. Of the 3528 patients included from these trials, 1531 were randomised to receive an echinocandin, 944 to amphotericin B and 1053 to a triazole. For all forms of invasive candidiasis, echinocandins were associated with the highest rate of treatment success when compared to amphotericin B (OR 1.41, 95% CI 1.04-1.92) and the triazoles (OR 1.82, 95% CI 1.35-2.51). Rank probability analysis favoured echinocandins as the most effective choice 98% of the time. Overall survival did not significantly differ between groups. CONCLUSIONS Among patients with invasive candidiasis, echinocandins had the best clinical outcomes and should remain the first-line agents in the treatment of invasive candidiasis.
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Affiliation(s)
- Koray K Demir
- Department of Medicine, McGill University Health Centre, Montréal, QC, Canada
| | - Guillaume Butler-Laporte
- Department of Medicine, McGill University Health Centre, Montréal, QC, Canada.,Division of Infectious Diseases, Department of Medicine, McGill University Health Centre, Montréal, QC, Canada.,Division of Medical Microbiology, Department of Laboratory Medicine, McGill University Health Centre, Montréal, QC, Canada
| | - Olivier Del Corpo
- Department of Medicine, McGill University Health Centre, Montréal, QC, Canada
| | - Taline Ekmekjian
- Medical Libraries, McGill University Health Centre, Montréal, QC, Canada
| | - Donald C Sheppard
- Department of Medicine, McGill University Health Centre, Montréal, QC, Canada.,Division of Infectious Diseases, Department of Medicine, McGill University Health Centre, Montréal, QC, Canada.,Division of Medical Microbiology, Department of Laboratory Medicine, McGill University Health Centre, Montréal, QC, Canada.,McGill Interdisciplinary Initiative in Infection and Immunity, Montréal, QC, Canada
| | - Todd C Lee
- Department of Medicine, McGill University Health Centre, Montréal, QC, Canada.,Division of Infectious Diseases, Department of Medicine, McGill University Health Centre, Montréal, QC, Canada.,McGill Interdisciplinary Initiative in Infection and Immunity, Montréal, QC, Canada.,Clinical Practice Assessment Unit, McGill University Health Centre, Montréal, QC, Canada
| | - Matthew P Cheng
- Department of Medicine, McGill University Health Centre, Montréal, QC, Canada.,Division of Infectious Diseases, Department of Medicine, McGill University Health Centre, Montréal, QC, Canada.,Division of Medical Microbiology, Department of Laboratory Medicine, McGill University Health Centre, Montréal, QC, Canada.,McGill Interdisciplinary Initiative in Infection and Immunity, Montréal, QC, Canada
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49
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Serota DP, Chueng TA, Schechter MC. Applying the Infectious Diseases Literature to People who Inject Drugs. Infect Dis Clin North Am 2021; 34:539-558. [PMID: 32782101 DOI: 10.1016/j.idc.2020.06.010] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
People who inject drugs (PWID) presenting with injection drug use-associated infections are an understudied population excluded from most prospective infectious disease (ID) clinical trials. Careful application of the existing ID literature to PWID must consider their unique medical, psychological, and social challenges. Identification and treatment of the underlying substance use disorder are key underpinnings to any successful ID intervention.
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Affiliation(s)
- David P Serota
- Division of Infectious Diseases, Department of Medicine, University of Miami Miller School of Medicine, 1120 Northwest 14 Street, Suite 851, Miami, FL 33136, USA.
| | - Teresa A Chueng
- Division of Infectious Diseases, Department of Medicine, University of Miami Miller School of Medicine, 1120 Northwest 14 Street, Suite 851, Miami, FL 33136, USA; Jackson Memorial Hospital, Jackson Health System, Miami, FL, USA. https://twitter.com/teresachueng
| | - Marcos C Schechter
- Division of Infectious Diseases, Department of Medicine, Emory University, 49 Jesse Hill Jr Dr SE, Atlanta, GA 30303, USA. https://twitter.com/limbsandlungs
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50
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Robertson J, McGoverin C, White JR, Vanholsbeeck F, Swift S. Rapid Detection of Escherichia coli Antibiotic Susceptibility Using Live/Dead Spectrometry for Lytic Agents. Microorganisms 2021; 9:924. [PMID: 33925816 PMCID: PMC8147107 DOI: 10.3390/microorganisms9050924] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2021] [Revised: 04/21/2021] [Accepted: 04/22/2021] [Indexed: 02/06/2023] Open
Abstract
Antibiotic resistance is a serious threat to public health. The empiric use of the wrong antibiotic occurs due to urgency in treatment combined with slow, culture-based diagnostic techniques. Inappropriate antibiotic choice can promote the development of antibiotic resistance. We investigated live/dead spectrometry using a fluorimeter (Optrode) as a rapid alternative to culture-based techniques through application of the LIVE/DEAD® BacLightTM Bacterial Viability Kit. Killing was detected by the Optrode in near real-time when Escherichia coli was treated with lytic antibiotics-ampicillin and polymyxin B-and stained with SYTO 9 and/or propidium iodide. Antibiotic concentration, bacterial growth phase, and treatment time used affected the efficacy of this detection method. Quantification methods of the lethal action and inhibitory action of the non-lytic antibiotics, ciprofloxacin and chloramphenicol, respectively, remain to be elucidated.
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Affiliation(s)
- Julia Robertson
- Department of Molecular Medicine and Pathology, The University of Auckland, Auckland 1023, New Zealand; (J.R.W.); (S.S.)
- The Dodd-Walls Centre for Photonic and Quantum Technologies, Auckland 1010, New Zealand; (C.M.); (F.V.)
| | - Cushla McGoverin
- The Dodd-Walls Centre for Photonic and Quantum Technologies, Auckland 1010, New Zealand; (C.M.); (F.V.)
- Department of Physics, The University of Auckland, Auckland 1010, New Zealand
| | - Joni R. White
- Department of Molecular Medicine and Pathology, The University of Auckland, Auckland 1023, New Zealand; (J.R.W.); (S.S.)
- The Dodd-Walls Centre for Photonic and Quantum Technologies, Auckland 1010, New Zealand; (C.M.); (F.V.)
| | - Frédérique Vanholsbeeck
- The Dodd-Walls Centre for Photonic and Quantum Technologies, Auckland 1010, New Zealand; (C.M.); (F.V.)
- Department of Physics, The University of Auckland, Auckland 1010, New Zealand
| | - Simon Swift
- Department of Molecular Medicine and Pathology, The University of Auckland, Auckland 1023, New Zealand; (J.R.W.); (S.S.)
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