1
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Dasgupta P, Vinil K, Kanaujia SP. Evolutionary trends indicate a coherent organization of sap operons. Res Microbiol 2024:104228. [PMID: 38972435 DOI: 10.1016/j.resmic.2024.104228] [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: 04/15/2024] [Revised: 06/30/2024] [Accepted: 07/02/2024] [Indexed: 07/09/2024]
Abstract
Human hosts possess a complex network of immune responses against microbial pathogens. The production of antimicrobial peptides (AMPs), which target the pathogen cell membranes and inhibit them from inhabiting the hosts, is one such mechanism. However, pathogens have evolved systems that encounter these host-produced AMPs. The Sap (sensitivity to antimicrobial peptides) transporter uptakes AMPs inside the microbial cell and proteolytically degrades them. The Sap transporters comprise five subunits encoded by genes in an operon. Despite its ubiquitous nature, its subunits are not found to be in tandem with many organisms. In this study, a total of 421 Sap transporters were analyzed for their operonic arrangement. Out of 421, a total of 352 operons were found to be in consensus arrangement, while the remaining 69 show a varying arrangement of genes. The analysis of the intergenic distance between the subunits of the sap operon suggests a signature pattern with sapAB (-4), sapBC (-14), sapCD (-1), and sapDF (-4 to 1). An evolutionary analysis of these operons favors the consensus arrangement of the Sap transporter systems, substantiating its prevalence in most of the Gram-negative pathogens. Overall, this study provides insight into bacterial evolution, favoring the maintenance of the genetic organization of essential pathogenicity factors.
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Affiliation(s)
- Pratik Dasgupta
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati - 781039, Assam, India
| | - Kavya Vinil
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati - 781039, Assam, India
| | - Shankar Prasad Kanaujia
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati - 781039, Assam, India.
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2
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Nagappan S, Apoorva S, Shome A, Bishnoi S, Shrivastava S, Mahawar M. Sensitivity to antimicrobial peptide A (SapA) contributes to the survival of Salmonella typhimurium against antimicrobial peptides, neutrophils and virulence in mice. Arch Microbiol 2024; 206:302. [PMID: 38874634 DOI: 10.1007/s00203-024-04032-1] [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: 04/08/2024] [Revised: 06/01/2024] [Accepted: 06/05/2024] [Indexed: 06/15/2024]
Abstract
Host-generated antimicrobial peptides (AMPs) play a pivotal role in defense against bacterial pathogens. AMPs kill invading bacteria majorly by disrupting the bacterial cell walls. AMPs are actively synthesized and released into the lumen of the gastrointestinal tract to limit colonization of enteric pathogens like Salmonella typhimurium (S. typhimurium). However, S. typhimurium has evolved several resistance mechanisms to defend AMPs. The multicomponent SapABCDF uptake transporter is one such system that helps in resisting AMPs. In the current study, we analyzed the role of S. typhimurium SapA against stress survival and virulence of this bacterium. ∆sapA mutant strain showed hypersensitivity to AMPs, like melittin and mastoparan. Further, ∆sapA mutant showed more than 22 folds (p = 0.019) hypersensitivity to neutrophils as compared to the WT strain of S. typhimurium. In addition, ∆sapA strain showed defective survival in mice. In conclusion, the results of the current study suggest that the SapA is essential for survival against AMPs and virulence of S. typhimurium.
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Affiliation(s)
- Sabapathi Nagappan
- Division of Biochemistry, ICAR-Indian Veterinary Research Institute, Izatnagar, UP, 243122, India
| | - Shekhar Apoorva
- Division of Biochemistry, ICAR-Indian Veterinary Research Institute, Izatnagar, UP, 243122, India
| | - Arijit Shome
- Division of Biochemistry, ICAR-Indian Veterinary Research Institute, Izatnagar, UP, 243122, India
| | - Shikha Bishnoi
- Division of Biochemistry, ICAR-Indian Veterinary Research Institute, Izatnagar, UP, 243122, India
| | - Sameer Shrivastava
- Division of Veterinary Biotechnology, ICAR-Indian Veterinary Research Institute, Izatnagar, UP, India
| | - Manish Mahawar
- Division of Biochemistry, ICAR-Indian Veterinary Research Institute, Izatnagar, UP, 243122, India.
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3
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Li Q, Li S, Sun H, Niinomi M, Nakano T. Preparation and characterizations of antibacterial iodine-containing coatings on pure Ti. J Mech Behav Biomed Mater 2024; 151:106366. [PMID: 38176198 DOI: 10.1016/j.jmbbm.2023.106366] [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: 11/28/2023] [Revised: 12/28/2023] [Accepted: 12/31/2023] [Indexed: 01/06/2024]
Abstract
Iodine-containing coatings were prepared on pure Ti surfaces via electrochemical deposition to enhance their antibacterial properties. The factors influencing iodine content were analyzed using an orthogonal experiment. The electrochemically deposited samples were characterized using scanning electron microscopy with energy dispersive spectroscopy and X-ray photoelectron spectroscopy, and their antibacterial properties and cytotoxicity were evaluated. The results showed that changing the deposition time is an effective way to control the iodine content. The iodine content, coating thickness, and adhesion of the samples increased with deposition time. Iodine in the coatings mainly exists in three forms, which are I2, I3-, and pentavalent iodine. For samples with iodine-containing coatings, the antibacterial ratios against E. coli and S. aureus were greater than 90% and increased with increasing iodine content. Although the samples with iodine-containing coatings showed some inhibition of the proliferation of MC3T3-E1 cells, the cell viabilities were all higher than 80%, suggesting that iodine-containing coatings are biosafe.
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Affiliation(s)
- Qiang Li
- School of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, PR China; Shanghai Engineering Research Center of High-Performance Medical Device Materials, Shanghai, 200093, PR China.
| | - Shuaishuai Li
- School of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, PR China
| | - Hao Sun
- School of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, PR China
| | - Mitsuo Niinomi
- School of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, PR China; Institute for Materials Research, Tohoku University, 2-1-1, Katahira, Aoba-ku, Sendai 980-8577, Japan; Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1, Yamada-Oka, Suita, Osaka 565-0871, Japan
| | - Takayoshi Nakano
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1, Yamada-Oka, Suita, Osaka 565-0871, Japan
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4
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Dong X, Liu Y, Adcock AF, Sheriff K, Liang W, Yang L, Sun YP. Carbon-TiO 2 Hybrid Quantum Dots for Photocatalytic Inactivation of Gram-Positive and Gram-Negative Bacteria. Int J Mol Sci 2024; 25:2196. [PMID: 38396872 PMCID: PMC10889188 DOI: 10.3390/ijms25042196] [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: 12/21/2023] [Revised: 02/05/2024] [Accepted: 02/09/2024] [Indexed: 02/25/2024] Open
Abstract
Carbon-semiconductor hybrid quantum dots are classical carbon dots with core carbon nanoparticles doped with a selected nanoscale semiconductor. Specifically, on those with the nanoscale TiO2 doping, denoted as CTiO2-Dots, their synthesis and thorough characterization were reported previously. In this work, the CTiO2-Dots were evaluated for their visible light-activated antibacterial function, with the results showing the effective killing of not only Gram-positive but also the generally more resistant Gram-negative bacteria. The hybrid dots are clearly more potent antibacterial agents than their neat carbon dot counterparts. Mechanistically, the higher antibacterial performance of the CTiO2-Dots is attributed to their superior photoexcited state properties, which are reflected by the observed much brighter fluorescence emissions. Also considered and discussed is the possibility of additional contributions to the antibacterial activities due to the photosensitization of the nanoscale TiO2 by its doped core carbon nanoparticles.
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Affiliation(s)
- Xiuli Dong
- Department of Pharmaceutical Sciences, Biomanufacturing Research Institute and Technology Enterprise, North Carolina Central University, Durham, NC 27707, USA; (X.D.); (L.Y.)
- Department of Microbiology and Immunology, School of Osteopathic Medicine, Campbell University, Buies Creek, NC 27506, USA
| | - Yamin Liu
- Department of Chemistry, Clemson University, Clemson, SC 29634, USA
| | - Audrey F. Adcock
- Department of Pharmaceutical Sciences, Biomanufacturing Research Institute and Technology Enterprise, North Carolina Central University, Durham, NC 27707, USA; (X.D.); (L.Y.)
| | - Kirkland Sheriff
- Department of Chemistry, Clemson University, Clemson, SC 29634, USA
| | - Weixiong Liang
- Department of Chemistry, Clemson University, Clemson, SC 29634, USA
| | - Liju Yang
- Department of Pharmaceutical Sciences, Biomanufacturing Research Institute and Technology Enterprise, North Carolina Central University, Durham, NC 27707, USA; (X.D.); (L.Y.)
| | - Ya-Ping Sun
- Department of Chemistry, Clemson University, Clemson, SC 29634, USA
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Bradley E, Haran J. The human gut microbiome and aging. Gut Microbes 2024; 16:2359677. [PMID: 38831607 PMCID: PMC11152108 DOI: 10.1080/19490976.2024.2359677] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/19/2024] [Accepted: 05/21/2024] [Indexed: 06/05/2024] Open
Abstract
The composition of the human gut microbiome has been observed to change over the course of an individual's life. From birth, it is shaped by mode of delivery, diet, environmental exposures, geographic location, exposures to medications, and by aging itself. Here, we present a narrative review of the gut microbiome across the lifespan with a focus on its impacts on aging and age-related diseases in humans. We will describe how it is shaped, and features of the gut microbiome that have been associated with diseases at different phases of life and how this can adversely affect healthy aging. Across the lifespan, and especially in old age, a diverse microbiome that includes organisms suspected to produce anti-inflammatory metabolites such as short-chain fatty acids, has been reported to be associated with healthy aging. These findings have been remarkably consistent across geographic regions of the world suggesting that they could be universal features of healthy aging across all cultures and genetic backgrounds. Exactly how these features of the microbiome affect biologic processes associated with aging thus promoting healthy aging will be crucial to targeting the gut microbiome for interventions that will support health and longevity.
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Affiliation(s)
- Evan Bradley
- UMass Chan Medical School, Department of Emergency Medicine and Department of Microbiology and Physiologic Systems, Program in Microbiome Dynamics, Worcester, MA, USA
| | - John Haran
- UMass Chan Medical School, Department of Emergency Medicine and Department of Microbiology and Physiologic Systems, Program in Microbiome Dynamics, Worcester, MA, USA
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Stojowska-Swędrzyńska K, Kuczyńska-Wiśnik D, Laskowska E. New Strategies to Kill Metabolically-Dormant Cells Directly Bypassing the Need for Active Cellular Processes. Antibiotics (Basel) 2023; 12:1044. [PMID: 37370363 DOI: 10.3390/antibiotics12061044] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2023] [Revised: 06/09/2023] [Accepted: 06/11/2023] [Indexed: 06/29/2023] Open
Abstract
Antibiotic therapy failure is often caused by the presence of persister cells, which are metabolically-dormant bacteria capable of surviving exposure to antimicrobials. Under favorable conditions, persisters can resume growth leading to recurrent infections. Moreover, several studies have indicated that persisters may promote the evolution of antimicrobial resistance and facilitate the selection of specific resistant mutants; therefore, in light of the increasing numbers of multidrug-resistant infections worldwide, developing efficient strategies against dormant cells is of paramount importance. In this review, we present and discuss the efficacy of various agents whose antimicrobial activity is independent of the metabolic status of the bacteria as they target cell envelope structures. Since the biofilm-environment is favorable for the formation of dormant subpopulations, anti-persister strategies should also include agents that destroy the biofilm matrix or inhibit biofilm development. This article reviews examples of selected cell wall hydrolases, polysaccharide depolymerases and antimicrobial peptides. Their combination with standard antibiotics seems to be the most promising approach in combating persistent infections.
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Affiliation(s)
- Karolina Stojowska-Swędrzyńska
- Department of General and Medical Biochemistry, Faculty of Biology, University of Gdansk, Wita Stwosza 59, 80-308 Gdansk, Poland
| | - Dorota Kuczyńska-Wiśnik
- Department of General and Medical Biochemistry, Faculty of Biology, University of Gdansk, Wita Stwosza 59, 80-308 Gdansk, Poland
| | - Ewa Laskowska
- Department of General and Medical Biochemistry, Faculty of Biology, University of Gdansk, Wita Stwosza 59, 80-308 Gdansk, Poland
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Khunsri I, Prombutara P, Htoo HH, Wanvimonsuk S, Samernate T, Pornsing C, Tharntada S, Jaree P, Chaikeeratisak V, Somboonwiwat K, Nonejuie P. Roles of qseC mutation in bacterial resistance against anti-lipopolysaccharide factor isoform 3 (ALFPm3). PLoS One 2023; 18:e0286764. [PMID: 37267395 PMCID: PMC10237662 DOI: 10.1371/journal.pone.0286764] [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: 03/21/2023] [Accepted: 05/23/2023] [Indexed: 06/04/2023] Open
Abstract
Propelled by global climate changes, the shrimp industry has been facing tremendous losses in production due to various disease outbreaks, particularly early mortality syndrome (EMS), a disease caused by Vibrio parahaemolyticus AHPND. Not only is the use of antibiotics as EMS control agents not yet been proven successful, but the overuse and misuse of antibiotics could also worsen one of the most challenging global health issues-antimicrobial resistance. To circumvent antibiotic usage, anti-lipopolysaccharide factor isoform 3 (ALFPm3), an antimicrobial peptide (AMP) derived from the shrimp innate immune system, was proposed as an antibiotic alternative for EMS control. However, prolonged use of AMPs could also lead to bacterial cross resistance with life-saving antibiotics used in human diseases. Here, we showed that ALFPm3-resistant strains of E. coli could be induced in vitro. Genome analysis of the resistant mutants revealed multiple mutations, with the most interesting being a qseC(L299R). A study of antibiotic susceptibility profile showed that the resistant strains harboring the qseC(L299R) not only exhibited higher degree of resistance towards polymyxin antibiotics, but also produced higher biofilm under ALFPm3 stress. Lastly, a single cell death analysis revealed that, at early-log phase when biofilm is scarce, the resistant strains were less affected by ALFPm3 treatment, suggesting additional mechanisms by which qseC orchestrates to protect the bacteria from ALFPm3. Altogether, this study uncovers involvement of qseC mutation in mechanism of resistance of the bacteria against ALFPm3 paving a way for future studies on sustainable use of ALFPm3 as an EMS control agent.
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Affiliation(s)
- Iyacoob Khunsri
- Institute of Molecular Biosciences, Mahidol University, Nakhon Pathom, Thailand
- Center for Vaccine Development, Institute of Molecular Biosciences, Mahidol University, Nakhon Pathom, Thailand
| | - Pinidphon Prombutara
- Omics Science and Bioinformatics Center, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
| | - Htut Htut Htoo
- Institute of Molecular Biosciences, Mahidol University, Nakhon Pathom, Thailand
| | - Supitcha Wanvimonsuk
- Center of Excellence for Molecular Biology and Genomics of Shrimp, Department of Biochemistry, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
| | - Thanadon Samernate
- Institute of Molecular Biosciences, Mahidol University, Nakhon Pathom, Thailand
| | - Chindanai Pornsing
- Institute of Molecular Biosciences, Mahidol University, Nakhon Pathom, Thailand
| | - Sirinit Tharntada
- Department of Veterinary Technology, Faculty of Veterinary Technology, Kasetsart University, Bangkok, Thailand
| | - Phattarunda Jaree
- Institute of Molecular Biosciences, Mahidol University, Nakhon Pathom, Thailand
| | - Vorrapon Chaikeeratisak
- Center of Excellence for Molecular Biology and Genomics of Shrimp, Department of Biochemistry, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
| | - Kunlaya Somboonwiwat
- Center of Excellence for Molecular Biology and Genomics of Shrimp, Department of Biochemistry, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
| | - Poochit Nonejuie
- Institute of Molecular Biosciences, Mahidol University, Nakhon Pathom, Thailand
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8
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Brink KR, Hunt MG, Mu AM, Groszman K, Hoang KV, Lorch KP, Pogostin BH, Gunn JS, Tabor JJ. An E. coli display method for characterization of peptide-sensor kinase interactions. Nat Chem Biol 2023; 19:451-459. [PMID: 36482094 PMCID: PMC10065900 DOI: 10.1038/s41589-022-01207-z] [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: 05/17/2021] [Accepted: 10/10/2022] [Indexed: 12/13/2022]
Abstract
Bacteria use two-component system (TCS) signaling pathways to sense and respond to peptides involved in host defense, quorum sensing and inter-bacterial warfare. However, little is known about the broad peptide-sensing capabilities of TCSs. In this study, we developed an Escherichia coli display method to characterize the effects of human antimicrobial peptides (AMPs) on the pathogenesis-regulating TCS PhoPQ of Salmonella Typhimurium with much higher throughput than previously possible. We found that PhoPQ senses AMPs with diverse sequences, structures and biological functions. We further combined thousands of displayed AMP variants with machine learning to identify peptide sub-domains and biophysical features linked to PhoPQ activation. Most of the newfound AMP activators induce PhoPQ in S. Typhimurium, suggesting possible roles in virulence regulation. Finally, we present evidence that PhoPQ peptide-sensing specificity has evolved across commensal and pathogenic bacteria. Our method enables new insights into the specificities, mechanisms and evolutionary dynamics of TCS-mediated peptide sensing in bacteria.
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Affiliation(s)
- Kathryn R Brink
- Ph.D. Program in Systems, Synthetic, and Physical Biology, Rice University, Houston, TX, USA
| | - Maxwell G Hunt
- Ph.D. Program in Systems, Synthetic, and Physical Biology, Rice University, Houston, TX, USA
| | - Andrew M Mu
- Department of Biosciences, Rice University, Houston, TX, USA
| | - Ken Groszman
- Operations Research Center, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Ky V Hoang
- Center for Microbial Pathogenesis, Nationwide Children's Hospital, Columbus, OH, USA
- Infectious Diseases Institute, The Ohio State University, Columbus, OH, USA
| | - Kevin P Lorch
- Department of Bioengineering, Rice University, Houston, TX, USA
| | | | - John S Gunn
- Center for Microbial Pathogenesis, Nationwide Children's Hospital, Columbus, OH, USA
- Infectious Diseases Institute, The Ohio State University, Columbus, OH, USA
- Department of Pediatrics, The Ohio State University College of Medicine, Columbus, OH, USA
| | - Jeffrey J Tabor
- Ph.D. Program in Systems, Synthetic, and Physical Biology, Rice University, Houston, TX, USA.
- Department of Biosciences, Rice University, Houston, TX, USA.
- Department of Bioengineering, Rice University, Houston, TX, USA.
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9
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Li T, Wang Z, Guo J, de la Fuente-Nunez C, Wang J, Han B, Tao H, Liu J, Wang X. Bacterial resistance to antibacterial agents: Mechanisms, control strategies, and implications for global health. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 860:160461. [PMID: 36435256 DOI: 10.1016/j.scitotenv.2022.160461] [Citation(s) in RCA: 29] [Impact Index Per Article: 29.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2022] [Revised: 11/19/2022] [Accepted: 11/20/2022] [Indexed: 06/16/2023]
Abstract
The spread of bacterial drug resistance has posed a severe threat to public health globally. Here, we cover bacterial resistance to current antibacterial drugs, including traditional herbal medicines, conventional antibiotics, and antimicrobial peptides. We summarize the influence of bacterial drug resistance on global health and its economic burden while highlighting the resistance mechanisms developed by bacteria. Based on the One Health concept, we propose 4A strategies to combat bacterial resistance, including prudent Application of antibacterial agents, Administration, Assays, and Alternatives to antibiotics. Finally, we identify several opportunities and unsolved questions warranting future exploration for combating bacterial resistance, such as predicting genetic bacterial resistance through the use of more effective techniques, surveying both genetic determinants of bacterial resistance and the transmission dynamics of antibiotic resistance genes (ARGs).
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Affiliation(s)
- Ting Li
- Institute of Feed Research, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China; Key Laboratory of Feed Biotechnology, Ministry of Agriculture and Rural Affairs, Beijing 100081, PR China; State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Biotechnology, No. 20, Dongda Street, Fengtai District, Beijing 100071, PR China
| | - Zhenlong Wang
- Institute of Feed Research, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China; Key Laboratory of Feed Biotechnology, Ministry of Agriculture and Rural Affairs, Beijing 100081, PR China
| | - Jianhua Guo
- Australian Centre for Water and Environmental Biotechnology (ACWEB, formerly AWMC), The University of Queensland, St Lucia, Queensland 4072, Australia.
| | - Cesar de la Fuente-Nunez
- Machine Biology Group, Departments of Psychiatry and Microbiology, Institute for Biomedical Informatics, Institute for Translational Medicine and Therapeutics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, United States of America; Departments of Bioengineering and Chemical and Biomolecular Engineering, School of Engineering and Applied Science, University of Pennsylvania, Philadelphia, PA, United States of America; Penn Institute for Computational Science, University of Pennsylvania, Philadelphia, PA, United States of America.
| | - Jinquan Wang
- Institute of Feed Research, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China; Key Laboratory of Feed Biotechnology, Ministry of Agriculture and Rural Affairs, Beijing 100081, PR China
| | - Bing Han
- Institute of Feed Research, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China; Key Laboratory of Feed Biotechnology, Ministry of Agriculture and Rural Affairs, Beijing 100081, PR China
| | - Hui Tao
- Institute of Feed Research, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China; Key Laboratory of Feed Biotechnology, Ministry of Agriculture and Rural Affairs, Beijing 100081, PR China
| | - Jie Liu
- Institute of Feed Research, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China; Key Laboratory of Feed Biotechnology, Ministry of Agriculture and Rural Affairs, Beijing 100081, PR China
| | - Xiumin Wang
- Institute of Feed Research, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China; Key Laboratory of Feed Biotechnology, Ministry of Agriculture and Rural Affairs, Beijing 100081, PR China.
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Iroha C, Ugwu M, Iroha I, Esimone C, Ejikeugwu C. Detection and Dissemination of MCR-1 Colistin Resistance Gene in a Hospital Setting in Abakaliki, Nigeria. JOURNAL OF MEDICAL SCIENCES 2023. [DOI: 10.3923/jms.2023.1.6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
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11
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Islam J, Sarkar H, Hoque H, Hasan MN, Jewel GNA. In-silico approach of identifying novel therapeutic targets against Yersinia pestis using pan and subtractive genomic analysis. Comput Biol Chem 2022; 101:107784. [DOI: 10.1016/j.compbiolchem.2022.107784] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2022] [Revised: 10/30/2022] [Accepted: 11/01/2022] [Indexed: 11/06/2022]
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12
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Yan J, Cai J, Zhang B, Wang Y, Wong DF, Siu SWI. Recent Progress in the Discovery and Design of Antimicrobial Peptides Using Traditional Machine Learning and Deep Learning. Antibiotics (Basel) 2022; 11:1451. [PMID: 36290108 PMCID: PMC9598685 DOI: 10.3390/antibiotics11101451] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2022] [Revised: 10/11/2022] [Accepted: 10/13/2022] [Indexed: 11/16/2022] Open
Abstract
Antimicrobial resistance has become a critical global health problem due to the abuse of conventional antibiotics and the rise of multi-drug-resistant microbes. Antimicrobial peptides (AMPs) are a group of natural peptides that show promise as next-generation antibiotics due to their low toxicity to the host, broad spectrum of biological activity, including antibacterial, antifungal, antiviral, and anti-parasitic activities, and great therapeutic potential, such as anticancer, anti-inflammatory, etc. Most importantly, AMPs kill bacteria by damaging cell membranes using multiple mechanisms of action rather than targeting a single molecule or pathway, making it difficult for bacterial drug resistance to develop. However, experimental approaches used to discover and design new AMPs are very expensive and time-consuming. In recent years, there has been considerable interest in using in silico methods, including traditional machine learning (ML) and deep learning (DL) approaches, to drug discovery. While there are a few papers summarizing computational AMP prediction methods, none of them focused on DL methods. In this review, we aim to survey the latest AMP prediction methods achieved by DL approaches. First, the biology background of AMP is introduced, then various feature encoding methods used to represent the features of peptide sequences are presented. We explain the most popular DL techniques and highlight the recent works based on them to classify AMPs and design novel peptide sequences. Finally, we discuss the limitations and challenges of AMP prediction.
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Affiliation(s)
- Jielu Yan
- PAMI Research Group, Department of Computer and Information Science, University of Macau, Taipa, Macau, China
| | - Jianxiu Cai
- Faculty of Applied Sciences, Macao Polytechnic University, Macau, China
- Institute of Science and Environment, University of Saint Joseph, Estr. Marginal da Ilha Verde, Macau, China
| | - Bob Zhang
- PAMI Research Group, Department of Computer and Information Science, University of Macau, Taipa, Macau, China
| | - Yapeng Wang
- Faculty of Applied Sciences, Macao Polytechnic University, Macau, China
| | - Derek F. Wong
- NLP2CT Lab, Department of Computer and Information Science, University of Macau, Taipa, Macau, China
| | - Shirley W. I. Siu
- Institute of Science and Environment, University of Saint Joseph, Estr. Marginal da Ilha Verde, Macau, China
- School of Pharmaceutical Sciences, Universiti Sains Malaysia, Pulau Pinang 11800, Malaysia
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13
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Orsini M, Ianni A, Zinzula L. Brucella ceti and Brucella pinnipedialis genome characterization unveils genetic features that highlight their zoonotic potential. Microbiologyopen 2022; 11:e1329. [PMID: 36314752 PMCID: PMC9597259 DOI: 10.1002/mbo3.1329] [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: 05/13/2022] [Revised: 10/07/2022] [Accepted: 10/07/2022] [Indexed: 11/06/2022] Open
Abstract
The Gram-negative bacteria Brucella ceti and Brucella pinnipedialis circulate in marine environments primarily infecting marine mammals, where they cause an often-fatal disease named brucellosis. The increase of brucellosis among several species of cetaceans and pinnipeds, together with the report of sporadic human infections, raises concerns about the zoonotic potential of these pathogens on a large scale and may pose a threat to coastal communities worldwide. Therefore, the characterization of the B. ceti and B. pinnipedialis genetic features is a priority to better understand the pathological factors that may impact global health. Moreover, an in-depth functional analysis of the B. ceti and B. pinnipedialis genome in the context of virulence and pathogenesis was not undertaken so far. Within this picture, here we present the comparative whole-genome characterization of all B. ceti and B. pinnipedialis genomes available in public resources, uncovering a collection of genetic tools possessed by these aquatic bacterial species compared to their zoonotic terrestrial relatives. We show that B. ceti and B. pinnipedialis genomes display a wide host-range infection capability and a polyphyletic phylogeny within the genus, showing a genomic structure that fits the canonical definition of closeness. Functional genome annotation led to identifying genes related to several pathways involved in mechanisms of infection, others conferring pan-susceptibility to antimicrobials and a set of virulence genes that highlight the similarity of B. ceti and B. pinnipedialis genotypes to those of Brucella spp. displaying human-infecting phenotypes.
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Affiliation(s)
- Massimiliano Orsini
- Istituto Zooprofilattico Sperimentale delle Venezie, Laboratory of Microbial Ecology and GenomicsLegnaroItaly
| | - Andrea Ianni
- Research Unit in Hygiene, Statistics and Public HealthCampus Bio‐Medico di Roma UniversityRomeItaly
| | - Luca Zinzula
- Department of Molecular Structural BiologyMax Planck Institute of BiochemistryMartinsriedGermany
- Centro di Educazione Ambientale e alla Sostenibilità (CEAS) Laguna di NoraPulaItaly
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14
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Acyldepsipeptide Analogues: A Future Generation Antibiotics for Tuberculosis Treatment. Pharmaceutics 2022; 14:pharmaceutics14091956. [PMID: 36145704 PMCID: PMC9502522 DOI: 10.3390/pharmaceutics14091956] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2022] [Revised: 09/09/2022] [Accepted: 09/12/2022] [Indexed: 11/25/2022] Open
Abstract
Acyldepsipeptides (ADEPs) are a new class of emerging antimicrobial peptides (AMPs), which are currently explored for treatment of pathogenic infections, including tuberculosis (TB). These cyclic hydrophobic peptides have a unique bacterial target to the conventional anti-TB drugs, and present a therapeutic window to overcome Mycobacterium Tuberculosis (M. tb) drug resistance. ADEPs exerts their antibacterial activity on M. tb strains through activation of the protein homeostatic regulatory protease, the caseinolytic protease (ClpP1P2). ClpP1P2 is normally regulated and activated by the ClpP-ATPases to degrade misfolded and toxic peptides and/or short proteins. ADEPs bind and dysregulate all the homeostatic capabilities of ClpP1P2 while inducing non-selective proteolysis. The uncontrolled proteolysis leads to M. tb cell death within the host. ADEPs analogues that have been tested possess cytotoxicity and poor pharmacokinetic and pharmacodynamic properties. However, these can be improved by drug design techniques. Moreover, the use of nanomaterial in conjunction with ADEPs would yield effective synergistic effect. This new mode of action has potential to combat and eradicate the extensive multi-drug resistance (MDR) problem that is currently faced by the public health pertaining bacterial infections, especially TB.
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15
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Moreno-Morales J, Guardiola S, Ballesté-Delpierre C, Giralt E, Vila J. A new synthetic protegrin as a promising peptide with antibacterial activity against MDR Gram-negative pathogens. J Antimicrob Chemother 2022; 77:3077-3085. [PMID: 35972429 DOI: 10.1093/jac/dkac284] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2022] [Accepted: 07/30/2022] [Indexed: 11/14/2022] Open
Abstract
OBJECTIVES Protegrins are a family of natural peptides from the innate immune system of vertebrates, with broad-spectrum antimicrobial activity. However, the toxicity and haemolysis of protegrin-1 (PG-1) at low concentrations renders it useless for therapeutic application. We rationally designed PLP-3, a novel synthetic PG-1-like peptide, comprising key activity features of protegrins in a constrained bicyclic structure. Our main objective was to investigate PLP-3's activity against MDR strains of Acinetobacter baumannii, Pseudomonas aeruginosa and Klebsiella pneumoniae and to analyse its haemolysis and cytotoxicity. METHODS Peptide synthesis was performed via solid phase and intramolecular ligation in solution, and the correct folding of the peptide was verified by circular dichroism. Antimicrobial activity was performed through broth microdilution. The test panel contained 45 bacterial strains belonging to A. baumannii, P. aeruginosa and K. pneumoniae (15 strains per species) comprising colistin-resistant and MDR strains. Cytotoxicity was assessed by XTT cell viability assays using HeLa and A549 cells and haemolysis of human erythrocytes. RESULTS PLP-3 was successfully synthesized, and its antiparallel β-sheet conformation was confirmed. Antimicrobial activity screening showed MIC90 values of 2 mg/L for A. baumannii, 16 mg/L for K. pneumoniae and 8 mg/L for P. aeruginosa. The haemolysis IC50 value was 48.53 mg/L. Cytotoxicity against human HeLa and A549 cells showed values of ca. 200 mg/L in both cell lines resulting in a 100-fold selectivity window for bacterial over human cells. CONCLUSIONS PLP-3 has potent antimicrobial activity, especially against A. baumannii, while maintaining low haemolysis and toxicity against human cell lines at antimicrobial concentrations. These characteristics make PLP-3 a promising peptide with an interesting therapeutic window.
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Affiliation(s)
| | | | - Clara Ballesté-Delpierre
- ISGlobal, Hospital Clínic - Universitat de Barcelona, Barcelona, Spain.,CIBER de Enfermedades Infecciosas (CIBERINFEC), Instituto Salud Carlos III, Madrid, Spain
| | - Ernest Giralt
- IRB Barcelona, Barcelona, Spain.,Department of Inorganic and Organic Chemistry, Universitat de Barcelona, Barcelona, Spain
| | - Jordi Vila
- ISGlobal, Hospital Clínic - Universitat de Barcelona, Barcelona, Spain.,CIBER de Enfermedades Infecciosas (CIBERINFEC), Instituto Salud Carlos III, Madrid, Spain.,Department of Clinical Microbiology, Hospital Clinic, Barcelona, Spain
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16
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Valeeva LR, Dague AL, Hall MH, Tikhonova AE, Sharipova MR, Valentovic MA, Bogomolnaya LM, Shakirov EV. Antimicrobial Activities of Secondary Metabolites from Model Mosses. Antibiotics (Basel) 2022; 11:1004. [PMID: 35892395 PMCID: PMC9331938 DOI: 10.3390/antibiotics11081004] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2022] [Revised: 07/20/2022] [Accepted: 07/21/2022] [Indexed: 02/06/2023] Open
Abstract
Plants synthetize a large spectrum of secondary metabolites with substantial structural and functional diversity, making them a rich reservoir of new biologically active compounds. Among different plant lineages, the evolutionarily ancient branch of non-vascular plants (Bryophytes) is of particular interest as these organisms produce many unique biologically active compounds with highly promising antibacterial properties. Here, we characterized antibacterial activity of metabolites produced by different ecotypes (strains) of the model mosses Physcomitrium patens and Sphagnum fallax. Ethanol and hexane moss extracts harbor moderate but unstable antibacterial activity, representing polar and non-polar intracellular moss metabolites, respectively. In contrast, high antibacterial activity that was relatively stable was detected in soluble exudate fractions of P. patens moss. Antibacterial activity levels in P. patens exudates significantly increased over four weeks of moss cultivation in liquid culture. Interestingly, secreted moss metabolites are only active against a number of Gram-positive, but not Gram-negative, bacteria. Size fractionation, thermostability and sensitivity to proteinase K assays indicated that the secreted bioactive compounds are relatively small (less than <10 kDa). Further analysis and molecular identification of antibacterial exudate components, combined with bioinformatic analysis of model moss genomes, will be instrumental in the identification of specific genes involved in the bioactive metabolite biosynthesis.
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Affiliation(s)
- Lia R. Valeeva
- Institute of Fundamental Medicine and Biology, Kazan Federal University, Kazan 420008, Russia; (L.R.V.); (A.E.T.); (M.R.S.)
| | - Ashley L. Dague
- Department of Biological Sciences, College of Science, Marshall University, Huntington, WV 25701, USA; (A.L.D.); (M.H.H.)
| | - Mitchell H. Hall
- Department of Biological Sciences, College of Science, Marshall University, Huntington, WV 25701, USA; (A.L.D.); (M.H.H.)
| | - Anastasia E. Tikhonova
- Institute of Fundamental Medicine and Biology, Kazan Federal University, Kazan 420008, Russia; (L.R.V.); (A.E.T.); (M.R.S.)
| | - Margarita R. Sharipova
- Institute of Fundamental Medicine and Biology, Kazan Federal University, Kazan 420008, Russia; (L.R.V.); (A.E.T.); (M.R.S.)
| | - 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 Biological Sciences, College of Science, Marshall University, Huntington, WV 25701, USA; (A.L.D.); (M.H.H.)
- Department of Biomedical Sciences, Joan C. Edwards School of Medicine, Marshall University, Huntington, WV 25755, USA;
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17
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Liu Y, Xu T, Wang Q, Huang J, Zhu Y, Liu X, Liu R, Yang B, Zhou K. Vibrio cholerae senses human enteric α-defensin 5 through a CarSR two-component system to promote bacterial pathogenicity. Commun Biol 2022; 5:559. [PMID: 35676416 PMCID: PMC9178039 DOI: 10.1038/s42003-022-03525-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2021] [Accepted: 05/23/2022] [Indexed: 11/09/2022] Open
Abstract
Vibrio cholerae (V. cholerae) is an aquatic bacterium responsible for acute and fatal cholera outbreaks worldwide. When V. cholerae is ingested, the bacteria colonize the epithelium of the small intestine and stimulate the Paneth cells to produce large amounts of cationic antimicrobial peptides (CAMPs). Human defensin 5 (HD-5) is the most abundant CAMPs in the small intestine. However, the role of the V. cholerae response to HD-5 remains unclear. Here we show that HD-5 significantly upregulates virulence gene expression. Moreover, a two-component system, CarSR (or RstAB), is essential for V. cholerae virulence gene expression in the presence of HD-5. Finally, phosphorylated CarR can directly bind to the promoter region of TcpP, activating transcription of tcpP, which in turn activates downstream virulence genes to promote V. cholerae colonization. In conclusion, this study reveals a virulence-regulating pathway, in which the CarSR two-component regulatory system senses HD-5 to activate virulence genes expression in V. cholerae.
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Affiliation(s)
- Yutao Liu
- TEDA Institute of Biological Sciences and Biotechnology, TEDA, Nankai University, Tianjin, PR China
| | - Tingting Xu
- The Second Clinical Medical College, Jinan University, The First Affiliated Hospital, Southern University of Science and Technology, Shenzhen People's Hospital, Shenzhen Institute of Respiratory Diseases, Shenzhen, Guangdong, PR China
| | - Qian Wang
- TEDA Institute of Biological Sciences and Biotechnology, TEDA, Nankai University, Tianjin, PR China
| | - Junxi Huang
- The Second Clinical Medical College, Jinan University, The First Affiliated Hospital, Southern University of Science and Technology, Shenzhen People's Hospital, Shenzhen Institute of Respiratory Diseases, Shenzhen, Guangdong, PR China
| | - Yangfei Zhu
- The Second Clinical Medical College, Jinan University, The First Affiliated Hospital, Southern University of Science and Technology, Laboratory Department, Shenzhen People's Hospital, Shenzhen, Guangdong, PR China
| | - Xingmei Liu
- TEDA Institute of Biological Sciences and Biotechnology, TEDA, Nankai University, Tianjin, PR China
| | - Ruiying Liu
- TEDA Institute of Biological Sciences and Biotechnology, TEDA, Nankai University, Tianjin, PR China
| | - Bin Yang
- TEDA Institute of Biological Sciences and Biotechnology, TEDA, Nankai University, Tianjin, PR China.
| | - Kai Zhou
- The Second Clinical Medical College, Jinan University, The First Affiliated Hospital, Southern University of Science and Technology, Shenzhen People's Hospital, Shenzhen Institute of Respiratory Diseases, Shenzhen, Guangdong, PR China.
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18
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Iubatti M, Gabas IM, Cavaco LM, Mood EH, Lim E, Bonanno F, Yavari N, Brolin C, Nielsen PE. Antisense Peptide Nucleic Acid-Diaminobutanoic Acid Dendron Conjugates with SbmA-Independent Antimicrobial Activity against Gram-Negative Bacteria. ACS Infect Dis 2022; 8:1098-1106. [PMID: 35436109 PMCID: PMC9112330 DOI: 10.1021/acsinfecdis.2c00089] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Precision antisense antibacterial agents may be developed into novel antibiotics in the fight against multidrug-resistant Gram-negative bacteria. In this study, a series of diaminobutanoic acid (DAB) dendrons are presented as novel carriers for the delivery of antisense antibacterial peptide nucleic acids (PNAs). The dendron-PNA conjugates targeting the essential acpP gene exhibit specific antisense antimicrobial bactericidal activity against Escherichia coli and Klebsiella pneumoniae at one-digit micromolar concentrations, while showing low toxicity to human cells. One compound selected from a structure-activity relationship series showed high stability in mouse and human serum (t1/2 ≫ 24 h) as well as in vivo activity against a multidrug-resistant, extended spectrum beta-lactamase-producing E. coli in a murine peritonitis model. The compound was also well tolerated in mice upon i.v. administration up to a dose of 20 mg/kg, and in vivo fluorescence imaging indicated clearance via renal excretion with slight accumulation in the kidneys and liver. Thus, DAB-based dendrons constitute a promising new chemistry platform for development of effective delivery agents for antibacterial drugs with possible in vivo use.
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Affiliation(s)
- Mirko Iubatti
- Center for Peptide-based Antibiotics, Department of Cellular and Molecular Medicine, The Panum Institute, Faculty of Health and Medical Sciences, University of Copenhagen, Blegdamsvej 3, Copenhagen 2200, Denmark
| | - Isabel Maicas Gabas
- Center for Peptide-based Antibiotics, Department of Cellular and Molecular Medicine, The Panum Institute, Faculty of Health and Medical Sciences, University of Copenhagen, Blegdamsvej 3, Copenhagen 2200, Denmark
| | - Lina M. Cavaco
- Department for Bacteria Parasites and Fungi, Statens Serum Institut, Copenhagen 2200, Denmark
| | - Elnaz Harifi Mood
- Center for Peptide-based Antibiotics, Department of Cellular and Molecular Medicine, The Panum Institute, Faculty of Health and Medical Sciences, University of Copenhagen, Blegdamsvej 3, Copenhagen 2200, Denmark
| | - Ernest Lim
- Center for Peptide-based Antibiotics, Department of Cellular and Molecular Medicine, The Panum Institute, Faculty of Health and Medical Sciences, University of Copenhagen, Blegdamsvej 3, Copenhagen 2200, Denmark
| | - Federica Bonanno
- Center for Peptide-based Antibiotics, Department of Cellular and Molecular Medicine, The Panum Institute, Faculty of Health and Medical Sciences, University of Copenhagen, Blegdamsvej 3, Copenhagen 2200, Denmark
| | - Niloofar Yavari
- Center for Peptide-based Antibiotics, Department of Cellular and Molecular Medicine, The Panum Institute, Faculty of Health and Medical Sciences, University of Copenhagen, Blegdamsvej 3, Copenhagen 2200, Denmark
| | - Camilla Brolin
- Center for Peptide-based Antibiotics, Department of Cellular and Molecular Medicine, The Panum Institute, Faculty of Health and Medical Sciences, University of Copenhagen, Blegdamsvej 3, Copenhagen 2200, Denmark
| | - Peter E. Nielsen
- Center for Peptide-based Antibiotics, Department of Cellular and Molecular Medicine, The Panum Institute, Faculty of Health and Medical Sciences, University of Copenhagen, Blegdamsvej 3, Copenhagen 2200, Denmark
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19
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Zhang B, Zhang M, Lin M, Dong X, Ma X, Xu Y, Sun J. Antibacterial Copolypeptoids with Potent Activity against Drug Resistant Bacteria and Biofilms, Excellent Stability, and Recycling Property. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2022; 18:e2106936. [PMID: 35142040 DOI: 10.1002/smll.202106936] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Revised: 01/06/2022] [Indexed: 06/14/2023]
Abstract
The preparation of a type of innovative cationic copolypeptoid antimicrobials containing various hydrophobic moieties that resemble both structure and membrane-lytic antibacterial mechanism of natural antimicrobial peptides (AMPs) is reported. By finely tuning the hydrophilic/hydrophobic balance, the polypeptoids exhibit a wide spectrum of antibacterial activity against both Gram-positive bacteria and Gram-negative bacteria with the lowest minimum inhibitory concentration (MIC) at only 2 µg mL-1 , whereas they also show low haemolytic properties. In particular, high selectivity (>128) is achieved from the polymers with butyl moieties. Moreover, the polypeptoids can readily inhibit the formation of biofilms and effectively eradicate the bacteria embedded in the mature biofilms, which is superior to many natural AMPs and vancomycin. Unlike conventional antibiotics, the polypeptoids possess potent activity against drug-resistant bacteria without visible resistance development after repeated usage. Notably, the polypeptoid antimicrobials not only have inherently fast bactericidal properties and excellent stability against incubation with human plasma, but also show excellent in vivo antibacterial effect. The prepared antimicrobials, coated onto magnetic nanospheres show recycling properties and enhanced antibacterial activity as combined with near-infrared (NIR)-induced photothermal antibacterial therapy.
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Affiliation(s)
- Bo Zhang
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012, China
- Key Laboratory of Biobased Polymer Materials, College of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao, 266042, China
| | - Meng Zhang
- Institute of Biomedical Engineering, College of Life Science, Qingdao University, Qingdao, 266071, China
| | - Min Lin
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012, China
| | - Xinzhe Dong
- Department of Radiation Oncology, Qilu Hospital of Shandong University, Jinan, 250000, China
| | - Xutao Ma
- Key Laboratory of Biobased Polymer Materials, College of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao, 266042, China
| | - Yuanhong Xu
- Institute of Biomedical Engineering, College of Life Science, Qingdao University, Qingdao, 266071, China
| | - Jing Sun
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012, China
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20
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Luong HX, Ngan HD, Thi Phuong HB, Quoc TN, Tung TT. Multiple roles of ribosomal antimicrobial peptides in tackling global antimicrobial resistance. ROYAL SOCIETY OPEN SCIENCE 2022; 9:211583. [PMID: 35116161 PMCID: PMC8790363 DOI: 10.1098/rsos.211583] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Accepted: 12/20/2021] [Indexed: 05/03/2023]
Abstract
In the last century, conventional antibiotics have played a significant role in global healthcare. Antibiotics support the body in controlling bacterial infection and simultaneously increase the tendency of drug resistance. Consequently, there is a severe concern regarding the regression of the antibiotic era. Despite the use of antibiotics, host defence systems are vital in fighting infectious diseases. In fact, the expression of ribosomal antimicrobial peptides (AMPs) has been crucial in the evolution of innate host defences and has been irreplaceable to date. Therefore, this valuable source is considered to have great potential in tackling the antimicrobial resistance (AMR) crisis. Furthermore, the possibility of bacterial resistance to AMPs has been intensively investigated. Here, we summarize all aspects related to the multiple applications of ribosomal AMPs and their derivatives in combating AMR.
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Affiliation(s)
- Huy Xuan Luong
- Faculty of Pharmacy, PHENIKAA University, Hanoi 12116, Vietnam
- PHENIKAA Institute for Advanced Study (PIAS), PHENIKAA University, Hanoi 12116, Vietnam
| | | | | | - Thang Nguyen Quoc
- Nuclear Medicine Unit, Vinmec Healthcare System, Hanoi 10000, Vietnam
| | - Truong Thanh Tung
- Faculty of Pharmacy, PHENIKAA University, Hanoi 12116, Vietnam
- PHENIKAA Institute for Advanced Study (PIAS), PHENIKAA University, Hanoi 12116, Vietnam
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21
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Enantioselectivity of Chiral Derivatives of Xanthones in Virulence Effects of Resistant Bacteria. Pharmaceuticals (Basel) 2021; 14:ph14111141. [PMID: 34832923 PMCID: PMC8623869 DOI: 10.3390/ph14111141] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Revised: 11/04/2021] [Accepted: 11/09/2021] [Indexed: 12/04/2022] Open
Abstract
Antimicrobial peptides are one of the lines of defense produced by several hosts in response to bacterial infections. Inspired by them and recent discoveries of xanthones as bacterial efflux pump inhibitors, chiral amides with a xanthone scaffold were planned to be potential antimicrobial adjuvants. The chiral derivatives of xanthones were obtained by peptide coupling reactions between suitable xanthones with enantiomerically pure building blocks, yielding derivatives with high enantiomeric purity. Among 18 compounds investigated for their antimicrobial activity against reference strains of bacteria and fungi, antibacterial activity for the tested strains was not found. Selected compounds were also evaluated for their potential to inhibit bacterial efflux pumps. Compound (R,R)-8 inhibited efflux pumps in the Gram-positive model tested and three compounds, (S,S)-8, (R)-17 and (R,S)-18, displayed the same activity in the Gram-negative strain used. Studies were performed on the inhibition of biofilm formation and quorum-sensing, to which the enantiomeric pair 8 displayed activity for the latter. To gain a better understanding of how the active compounds bind to the efflux pumps, docking studies were performed. Hit compounds were proposed for each activity, and it was shown that enantioselectivity was noticeable and must be considered, as enantiomers displayed differences in activity.
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22
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Nunes LGP, Reichert T, Machini MT. His-Rich Peptides, Gly- and His-Rich Peptides: Functionally Versatile Compounds with Potential Multi-Purpose Applications. Int J Pept Res Ther 2021. [DOI: 10.1007/s10989-021-10302-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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23
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Gera S, Kankuri E, Kogermann K. Antimicrobial peptides - Unleashing their therapeutic potential using nanotechnology. Pharmacol Ther 2021; 232:107990. [PMID: 34592202 DOI: 10.1016/j.pharmthera.2021.107990] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Revised: 08/30/2021] [Accepted: 09/01/2021] [Indexed: 02/07/2023]
Abstract
Antimicrobial peptides (AMPs) are potent, mostly cationic, and amphiphilic broad-spectrum host defense antimicrobials that are produced by all organisms ranging from prokaryotes to humans. In addition to their antimicrobial actions, they modulate inflammatory and immune responses and promote wound healing. Although they have clear benefits over traditional antibiotic drugs, their wide therapeutic utilization is compromised by concerns of toxicity, stability, and production costs. Recent advances in nanotechnology have attracted increasing interest to unleash the AMPs' immense potential as broad-spectrum antibiotics and anti-biofilm agents, against which the bacteria have less chances to develop resistance. Topical application of AMPs promotes migration of keratinocytes and fibroblasts, and contributes significantly to an accelerated wound healing process. Delivery of AMPs by employing nanotechnological approaches avoids the major disadvantages of AMPs, such as instability and toxicity, and provides a controlled delivery profile together with prolonged activity. In this review, we provide an overview of the key properties of AMPs and discuss the latest developments in topical AMP therapy using nanocarriers. We use chronic hard-to-heal wounds-complicated by infections, inflammation, and stagnated healing-as an example of an unmet medical need for which the AMPs' wide range of therapeutic actions could provide the most potential benefit. The use of innovative materials and sophisticated nanotechnological approaches offering various possibilities are discussed in more depth.
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Affiliation(s)
- Sonia Gera
- Institute of Pharmacy, University of Tartu, Nooruse 1, 50411 Tartu, Estonia
| | - Esko Kankuri
- Department of Pharmacology, Faculty of Medicine, University of Helsinki, Haartmaninkatu 8, 00290 Helsinki, Finland.
| | - Karin Kogermann
- Institute of Pharmacy, University of Tartu, Nooruse 1, 50411 Tartu, Estonia.
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24
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Jiménez-Vargas JM, Ramírez-Carreto S, Corzo G, Possani LD, Becerril B, Ortiz E. Structural and functional characterization of NDBP-4 family antimicrobial peptides from the scorpion Mesomexovis variegatus. Peptides 2021; 141:170553. [PMID: 33862164 DOI: 10.1016/j.peptides.2021.170553] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/09/2020] [Revised: 04/06/2021] [Accepted: 04/08/2021] [Indexed: 12/13/2022]
Abstract
Six peptides, belonging to the NDBP-4 family of scorpion antimicrobial peptides were structurally and functionally characterized. The sequence of the mature peptides VpCT1, VpCT2, VpCT3 and VpCT4 was inferred by transcriptomic analysis of the venom gland of the scorpion Mesomexovis variegatus. Analysis of their amino acid sequences revealed patterns that are also present in previously reported peptides that show differences in their hemolytic and antimicrobial activities in vitro. Two other variants, VpCT3W and VpCTConsensus were designed to evaluate the effect of sequence changes of interest on their structure and activity. The synthesized peptides were evaluated by circular dichroism to confirm their α-helical conformation in a folding promoting medium. The peptides were assayed on two Gram-positive and three Gram-negative bacterial strains, and on two yeast strains. They preferentially inhibited the growth of Staphylococcus aureus, were mostly ineffective on Pseudomonas aeruginosa, and moderately inhibited the growth of Candida yeasts. All six peptides exhibited hemolytic activity on human erythrocytes in the range of 4.8-83.7 μM. VpCT3W displayed increased hemolytic and anti-yeast activities, but showed no change in antibacterial activity, relative to its parental peptide, suggesting that Trp6 may potentiate the interaction of VpCT3 with eukaryotic cell membranes. VpCTConsensus showed broader and enhanced antimicrobial activity relative to several of the natural peptides. The results presented here contribute new information on the structure and function of NDBP-4 antimicrobial peptides and provides clues for the design of less hemolytic and more effective antimicrobial peptides.
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Affiliation(s)
- Juana María Jiménez-Vargas
- Instituto de Biotecnología, Universidad Nacional Autónoma de México, Avenida Universidad, 2001, Colonia Chamilpa, Cuernavaca, Morelos, 62210, Mexico; Consejo Nacional de Ciencia y Tecnología (CONACyT), CDMX, Mexico
| | - Santos Ramírez-Carreto
- Instituto de Biotecnología, Universidad Nacional Autónoma de México, Avenida Universidad, 2001, Colonia Chamilpa, Cuernavaca, Morelos, 62210, Mexico
| | - Gerardo Corzo
- Instituto de Biotecnología, Universidad Nacional Autónoma de México, Avenida Universidad, 2001, Colonia Chamilpa, Cuernavaca, Morelos, 62210, Mexico
| | - Lourival D Possani
- Instituto de Biotecnología, Universidad Nacional Autónoma de México, Avenida Universidad, 2001, Colonia Chamilpa, Cuernavaca, Morelos, 62210, Mexico
| | - Baltazar Becerril
- Instituto de Biotecnología, Universidad Nacional Autónoma de México, Avenida Universidad, 2001, Colonia Chamilpa, Cuernavaca, Morelos, 62210, Mexico
| | - Ernesto Ortiz
- Instituto de Biotecnología, Universidad Nacional Autónoma de México, Avenida Universidad, 2001, Colonia Chamilpa, Cuernavaca, Morelos, 62210, Mexico.
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25
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Totsingan F, Liu F, Gross RA. Structure-Activity Relationship Assessment of Sophorolipid Ester Derivatives against Model Bacteria Strains. Molecules 2021; 26:3021. [PMID: 34069408 PMCID: PMC8158775 DOI: 10.3390/molecules26103021] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2021] [Revised: 05/12/2021] [Accepted: 05/16/2021] [Indexed: 11/27/2022] Open
Abstract
Sophorolipids (SLs) are glycolipids that consist of a hydrophilic sophorose head group covalently linked to a hydrophobic fatty acid tail. They are produced by fermentation of non-pathogenic yeasts such as Candida Bombicola. The fermentation products predominantly consist of the diacetylated lactonic form that coexists with the open-chain acidic form. A systematic series of modified SLs were prepared by ring opening of natural lactonic SL with n-alkanols of varying chain length under alkaline conditions and lipase-selective acetylation of sophorose primary hydroxyl groups. The antimicrobial activity of modified SLs against Gram-positive human pathogens was a function of the n-alkanol length, as well as the degree of sophorose acetylation at the primary hydroxyl sites. Modified SLs were identified with promising antimicrobial activities against Gram-positive human pathogens with moderate selectivity (therapeutic index, TI = EC50/MICB. cereus = 6-33). SL-butyl ester exhibited the best antimicrobial activity (MIC = 12 μM) and selectivity (TI = 33) among all SLs tested. Kinetic studies revealed that SL-ester derivatives kill B. cereus in a time-dependent manner resulting in greater than a 3-log reduction in cell number within 1 h at 2×MIC. In contrast, lactonic SL required 3 h to achieve the same efficiency.
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Affiliation(s)
- Filbert Totsingan
- Department of Chemistry and Chemical Biology, Rensselaer Polytechnic Institute, Troy, NY 12180, USA
| | - Fei Liu
- Center for Biotechnology and Interdisciplinary Studies (CBIS), Rensselaer Polytechnic Institute, Troy, NY 12180, USA;
| | - Richard A. Gross
- Center for Biotechnology and Interdisciplinary Studies (CBIS), Rensselaer Polytechnic Institute, Troy, NY 12180, USA;
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Tamayo JA, Riascos M, Vargas CA, Baena LM. Additive manufacturing of Ti6Al4V alloy via electron beam melting for the development of implants for the biomedical industry. Heliyon 2021; 7:e06892. [PMID: 34027149 PMCID: PMC8120950 DOI: 10.1016/j.heliyon.2021.e06892] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Revised: 01/27/2021] [Accepted: 04/21/2021] [Indexed: 11/18/2022] Open
Abstract
Additive Manufacturing (AM) or rapid prototyping technologies are presented as one of the best options to produce customized prostheses and implants with high-level requirements in terms of complex geometries, mechanical properties, and short production times. The AM method that has been more investigated to obtain metallic implants for medical and biomedical use is Electron Beam Melting (EBM), which is based on the powder bed fusion technique. One of the most common metals employed to manufacture medical implants is titanium. Although discovered in 1790, titanium and its alloys only started to be used as engineering materials for biomedical prostheses after the 1950s. In the biomedical field, these materials have been mainly employed to facilitate bone adhesion and fixation, as well as for joint replacement surgeries, thanks to their good chemical, mechanical, and biocompatibility properties. Therefore, this study aims to collect relevant and up-to-date information from an exhaustive literature review on EBM and its applications in the medical and biomedical fields. This AM method has become increasingly popular in the manufacturing sector due to its great versatility and geometry control.
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Affiliation(s)
- José A. Tamayo
- Grupo Calidad, Metrología y Producción, Instituto Tecnológico Metropolitano (ITM), Medellín, Colombia
| | - Mateo Riascos
- Grupo Calidad, Metrología y Producción, Instituto Tecnológico Metropolitano (ITM), Medellín, Colombia
| | - Carlos A. Vargas
- Grupo Materiales Avanzados y Energía (Matyer), Instituto Tecnológico Metropolitano (ITM), Medellín, Colombia
| | - Libia M. Baena
- Grupo de Química Básica, Aplicada y Ambiente (Alquimia), Instituto Tecnológico Metropolitano (ITM), Medellín, Colombia
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Zhong K, Wang Y, Wang Z, Zhang Z, Zhao S, Li H, Huang J, Guo W, Zheng X, Guo G, Zhou L, Yang H, Tong A. AP-64, Encoded by C5orf46, Exhibits Antimicrobial Activity against Gram-Negative Bacteria. Biomolecules 2021; 11:biom11040485. [PMID: 33804835 PMCID: PMC8063792 DOI: 10.3390/biom11040485] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Revised: 03/16/2021] [Accepted: 03/20/2021] [Indexed: 02/05/2023] Open
Abstract
Antimicrobial peptides (AMPs), which are evolutionarily conserved components of the innate immune response, contribute to the first line of defense against microbes in the skin and at mucosal surfaces. Here, we report the identification of a human peptide, encoded by the chromosome 5 open reading frame 46 (C5orf46) gene, as a type of AMP, which we termed antimicrobial peptide with 64 amino acid residues (AP-64). AP-64 is an anionic amphiphilic peptide lacking cysteines (MW = 7.2, PI = 4.54). AP-64 exhibited significant antibacterial activity against Gram-negative bacteria, including Escherichia coli DH5α, Escherichia coli O157:H7, Vibrio cholerae, and Pseudomonas aeruginosa. Moreover, AP-64 was efficient in combating Escherichia coli O157:H7 infections in a mouse model and exhibited cytotoxic effects against human T-cell lymphoma Jurkat and B-cell lymphoma Raji cells. We also observed that Gm94, encoded by mouse C5orf46 homologous gene, closely resembles AP-64 in its antibacterial properties. Compared with other human AMPs, AP-64 has distinct characteristics, including a longer sequence length, absence of cysteine residues, a highly anionic character, and cell toxicity. Together, this study identified that AP-64 is an AMP worthy of further investigation.
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Affiliation(s)
- Kunhong Zhong
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, West China Medical School, Sichuan University, Chengdu 610041, China; (K.Z.); (Z.W.); (Z.Z.); (S.Z.); (H.L.); (W.G.); (G.G.)
| | - Yuelong Wang
- Department of Neurosurgery, West China Hospital, Sichuan University, Chengdu 610041, China; (Y.W.); (J.H.); (L.Z.)
| | - Zeng Wang
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, West China Medical School, Sichuan University, Chengdu 610041, China; (K.Z.); (Z.W.); (Z.Z.); (S.Z.); (H.L.); (W.G.); (G.G.)
| | - Zongliang Zhang
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, West China Medical School, Sichuan University, Chengdu 610041, China; (K.Z.); (Z.W.); (Z.Z.); (S.Z.); (H.L.); (W.G.); (G.G.)
| | - Shasha Zhao
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, West China Medical School, Sichuan University, Chengdu 610041, China; (K.Z.); (Z.W.); (Z.Z.); (S.Z.); (H.L.); (W.G.); (G.G.)
| | - Hexian Li
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, West China Medical School, Sichuan University, Chengdu 610041, China; (K.Z.); (Z.W.); (Z.Z.); (S.Z.); (H.L.); (W.G.); (G.G.)
| | - Jianhan Huang
- Department of Neurosurgery, West China Hospital, Sichuan University, Chengdu 610041, China; (Y.W.); (J.H.); (L.Z.)
| | - Wenhao Guo
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, West China Medical School, Sichuan University, Chengdu 610041, China; (K.Z.); (Z.W.); (Z.Z.); (S.Z.); (H.L.); (W.G.); (G.G.)
| | - Xi Zheng
- Lung Cancer Center, West China Hospital, Sichuan University, Chengdu 610041, China;
| | - Gang Guo
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, West China Medical School, Sichuan University, Chengdu 610041, China; (K.Z.); (Z.W.); (Z.Z.); (S.Z.); (H.L.); (W.G.); (G.G.)
| | - Liangxue Zhou
- Department of Neurosurgery, West China Hospital, Sichuan University, Chengdu 610041, China; (Y.W.); (J.H.); (L.Z.)
| | - Hui Yang
- Department of Otolaryngology, Head and Neck Surgery, West China Hospital, Sichuan University, Chengdu 610041, China
- Correspondence: (H.Y.); (A.T.); Tel.: +86-28-85502796 (H.Y. & A.T.)
| | - Aiping Tong
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, West China Medical School, Sichuan University, Chengdu 610041, China; (K.Z.); (Z.W.); (Z.Z.); (S.Z.); (H.L.); (W.G.); (G.G.)
- Correspondence: (H.Y.); (A.T.); Tel.: +86-28-85502796 (H.Y. & A.T.)
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Mai B, Gao Y, Li M, Jia M, Liu S, Wang X, Zhang K, Liu Q, Wang P. Tailoring the cationic lipid composition of lipo-DVDMS augments the phototherapy efficiency of burn infection. Biomater Sci 2021; 9:2053-2066. [PMID: 33470996 DOI: 10.1039/d0bm01895c] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Increase in infections with Gram-negative Pseudomonas aeruginosa (P. aeruginosa) is a serious global challenge in healthcare. Sinoporphyrin sodium (DVDMS) combined with photodynamic antimicrobial chemotherapy (PACT) can effectively eradicate Gram-positive organisms. However, the poor penetration of DVDMS into the Gram-negative bacterial cell membrane and bacterial biofilm greatly limits the photo-inspired antimicrobial activity. This study optimized the cationic lipid-mediated nano-DVDMS delivery to improve the cellular uptake, and evaluated the antimicrobial efficacy of cationic DVDMS-liposome (CDL)-provoked PACT in both P. aeruginosa and its multidrug resistant strain. The results showed that the positively charged liposome modification promoted the enrichment of DVDMS in Gram-negative bacteria. CDL-PACT-produced ROS and caused bacterial death, accompanied by the decreased expression levels of virulence factor-related genes. The P. aeruginosa-infected burn model indicated satisfactory bacterial eradication and accelerated wound healing after CDL-PACT, in addition to gradually increasing bFGF, VEGF, TGF-β1 and Hyp levels and reducing TNF-α and IL-6, with no detectable side-effects. Overall, these findings provide fundamental knowledge that enables the design of feasible and efficient PACT treatments, including biophysical membrane permeabilization and photodynamic eradication, which are promising to overcome the infection and resistance of highly opportunistic Gram-negative bacteria.
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Affiliation(s)
- Bingjie Mai
- Key Laboratory of Medicinal Resources and Natural Pharmaceutical Chemistry, Ministry of Education, National Engineering Laboratory for Resource Developing of Endangered Chinese Crude Drugs in Northwest of China, College of Life Sciences, Shaanxi Normal University, Xi'an 710119, Shaanxi, China.
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Evolution of Colistin Resistance in the Klebsiella pneumoniae Complex Follows Multiple Evolutionary Trajectories with Variable Effects on Fitness and Virulence Characteristics. Antimicrob Agents Chemother 2020; 65:AAC.01958-20. [PMID: 33139278 DOI: 10.1128/aac.01958-20] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2020] [Accepted: 10/25/2020] [Indexed: 12/14/2022] Open
Abstract
The increasing prevalence of multidrug-resistant Klebsiella pneumoniae has led to a resurgence in the use of colistin as a last-resort drug. Colistin is a cationic antibiotic that selectively acts on Gram-negative bacteria through electrostatic interactions with anionic phosphate groups of the lipid A moiety of lipopolysaccharides (LPSs). Colistin resistance in K. pneumoniae is mediated through loss of these phosphate groups, their modification by cationic groups, and by the hydroxylation of acyl groups of lipid A. Here, we study the in vitro evolutionary trajectories toward colistin resistance in four clinical K. pneumoniae complex strains and their impact on fitness and virulence characteristics. Through population sequencing during in vitro evolution, we found that colistin resistance develops through a combination of single nucleotide polymorphisms, insertions and deletions, and the integration of insertion sequence elements, affecting genes associated with LPS biosynthesis and modification and capsule structures. Colistin resistance decreased the maximum growth rate of one K. pneumoniae sensu stricto strain, but not those of the other three K. pneumoniae complex strains. Colistin-resistant strains had lipid A modified through hydroxylation, palmitoylation, and l-Ara4N addition. K. pneumoniae sensu stricto strains exhibited cross-resistance to LL-37, in contrast to the Klebsiella variicola subsp. variicola strain. Virulence, as determined in a Caenorhabditis elegans survival assay, was increased in two colistin-resistant strains. Our study suggests that nosocomial K. pneumoniae complex strains can rapidly develop colistin resistance through diverse evolutionary trajectories upon exposure to colistin. This effectively shortens the life span of this last-resort antibiotic for the treatment of infections with multidrug-resistant Klebsiella.
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Jia F, Wang J, Zhang L, Zhou J, He Y, Lu Y, Liu K, Yan W, Wang K. Multiple action mechanism and in vivo antimicrobial efficacy of antimicrobial peptide Jelleine-I. J Pept Sci 2020; 27:e3294. [PMID: 33283388 DOI: 10.1002/psc.3294] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2020] [Revised: 10/09/2020] [Accepted: 11/19/2020] [Indexed: 12/28/2022]
Abstract
With the extensive use of antibiotics in medicine, agriculture and food chemistry, the emergence of multi-drug resistant bacteria become more and more frequent and posed great threats to human health and life. So novel antimicrobial agents were urgently needed to defend the resistant bacteria. Jelleine-I was a small antimicrobial peptide (AMP) with eight amino acids in its sequence. It was believed to be an ideal template for developing antimicrobial agents. In the present study, the possible action mode against both gram-negative bacteria and gram-positive bacteria and in vivo antimicrobial activity was explored. Our results showed that Jelleine-I exhibits its antimicrobial activity mainly by disrupting the integrity of the cell membrane, which would not be affected by the conventional resistant mechanism. It also aims at some intracellular targets such as genomic DNA to inhibit the growth of microbes. In addition, the result of in vivo antimicrobial activity experiment showed that Jelleine-I performed a good therapeutic effect toward the mice with Escherichia coli infected peritonitis. Notably, Jelleine-I has negligible cytotoxicity toward the tested mammalian cells, indicating excellent cell selectivity between prokaryotic cells and eurkayotic cells. In summary, our results showed that Jelleine-I would be a potential candidate to be developed as a novel antimicrobial agent.
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Affiliation(s)
- Fengjing Jia
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, Institute of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Research Unit of Peptide Science of Chinese Academy of Medical Sciences 2019RU066, Lanzhou University, West Donggang Road, 199, Lanzhou, 730000, China
| | - Jiayi Wang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, Institute of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Research Unit of Peptide Science of Chinese Academy of Medical Sciences 2019RU066, Lanzhou University, West Donggang Road, 199, Lanzhou, 730000, China
| | - Lishi Zhang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, Institute of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Research Unit of Peptide Science of Chinese Academy of Medical Sciences 2019RU066, Lanzhou University, West Donggang Road, 199, Lanzhou, 730000, China
| | - Jingjing Zhou
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, Institute of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Research Unit of Peptide Science of Chinese Academy of Medical Sciences 2019RU066, Lanzhou University, West Donggang Road, 199, Lanzhou, 730000, China
| | - Yuhang He
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, Institute of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Research Unit of Peptide Science of Chinese Academy of Medical Sciences 2019RU066, Lanzhou University, West Donggang Road, 199, Lanzhou, 730000, China
| | - Yaqi Lu
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, Institute of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Research Unit of Peptide Science of Chinese Academy of Medical Sciences 2019RU066, Lanzhou University, West Donggang Road, 199, Lanzhou, 730000, China
| | - Kexin Liu
- School/Hospital of Stomatology, Lanzhou University, West Donggang Road 199, Lanzhou, 730000, China
| | - Wenjin Yan
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, Institute of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Research Unit of Peptide Science of Chinese Academy of Medical Sciences 2019RU066, Lanzhou University, West Donggang Road, 199, Lanzhou, 730000, China
| | - Kairong Wang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, Institute of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Research Unit of Peptide Science of Chinese Academy of Medical Sciences 2019RU066, Lanzhou University, West Donggang Road, 199, Lanzhou, 730000, China
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Nang SC, Han ML, Yu HH, Wang J, Torres VVL, Dai C, Velkov T, Harper M, Li J. Polymyxin resistance in Klebsiella pneumoniae: multifaceted mechanisms utilized in the presence and absence of the plasmid-encoded phosphoethanolamine transferase gene mcr-1. J Antimicrob Chemother 2020; 74:3190-3198. [PMID: 31365098 DOI: 10.1093/jac/dkz314] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2019] [Revised: 06/13/2019] [Accepted: 06/21/2019] [Indexed: 01/22/2023] Open
Abstract
OBJECTIVES Until plasmid-mediated mcr-1 was discovered, it was believed that polymyxin resistance in Gram-negative bacteria was mainly mediated by the chromosomally-encoded EptA and ArnT, which modify lipid A with phosphoethanolamine (pEtN) and 4-amino-4-deoxy-l-arabinose (l-Ara4N), respectively. This study aimed to construct a markerless mcr-1 deletion mutant in Klebsiella pneumoniae, validate a reliable reference gene for reverse transcription quantitative PCR (RT-qPCR) and investigate the interactions among mcr-1, arnT and eptA, in response to polymyxin treatments using pharmacokinetics/pharmacodynamics (PK/PD). METHODS An isogenic markerless mcr-1 deletion mutant (II-503Δmcr-1) was generated from a clinical K. pneumoniae II-503 isolate. The efficacy of different polymyxin B dosage regimens was examined using an in vitro one-compartment PK/PD model and polymyxin resistance was assessed using population analysis profiles. The expression of mcr-1, eptA and arnT was examined using RT-qPCR with a reference gene pepQ, and lipid A was profiled using LC-MS. In vivo polymyxin B efficacy was investigated in a mouse thigh infection model. RESULTS In K. pneumoniae II-503, mcr-1 was constitutively expressed, irrespective of polymyxin exposure. Against II-503Δmcr-1, an initial bactericidal effect was observed within 4 h with polymyxin B at average steady-state concentrations of 1 and 3 mg/L, mimicking patient PK. However, substantial regrowth and concomitantly increased expression of eptA and arnT were detected. Predominant l-Ara4N-modified lipid A species were detected in II-503Δmcr-1 following polymyxin B treatment. CONCLUSIONS This is the first study demonstrating a unique markerless deletion of mcr-1 in a clinical polymyxin-resistant K. pneumoniae. The current polymyxin B dosage regimens are suboptimal against K. pneumoniae, regardless of mcr, and can lead to the emergence of resistance.
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Affiliation(s)
- Sue C Nang
- Department of Microbiology, Infection and Immunity Program, Monash Biomedicine Discovery Institute, Monash University, Clayton, Victoria, Australia
| | - Mei-Ling Han
- Department of Microbiology, Infection and Immunity Program, Monash Biomedicine Discovery Institute, Monash University, Clayton, Victoria, Australia
| | - Heidi H Yu
- Department of Microbiology, Infection and Immunity Program, Monash Biomedicine Discovery Institute, Monash University, Clayton, Victoria, Australia
| | - Jiping Wang
- Department of Microbiology, Infection and Immunity Program, Monash Biomedicine Discovery Institute, Monash University, Clayton, Victoria, Australia
| | - Von Vergel L Torres
- Department of Microbiology, Infection and Immunity Program, Monash Biomedicine Discovery Institute, Monash University, Clayton, Victoria, Australia
| | - Chongshan Dai
- College of Veterinary Medicine, China Agricultural University, Beijing, China
| | - Tony Velkov
- Department of Pharmacology and Therapeutics, School of Biomedical Sciences, Faculty of Medicine, Dentistry and Health Sciences, University of Melbourne, Parkville, Victoria, Australia
| | - Marina Harper
- Department of Microbiology, Infection and Immunity Program, Monash Biomedicine Discovery Institute, Monash University, Clayton, Victoria, Australia
| | - Jian Li
- Department of Microbiology, Infection and Immunity Program, Monash Biomedicine Discovery Institute, Monash University, Clayton, Victoria, Australia
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Ortega MÁ, Guzmán Merino A, Fraile-Martínez O, Recio-Ruiz J, Pekarek L, G. Guijarro L, García-Honduvilla N, Álvarez-Mon M, Buján J, García-Gallego S. Dendrimers and Dendritic Materials: From Laboratory to Medical Practice in Infectious Diseases. Pharmaceutics 2020; 12:pharmaceutics12090874. [PMID: 32937793 PMCID: PMC7560085 DOI: 10.3390/pharmaceutics12090874] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2020] [Revised: 09/11/2020] [Accepted: 09/11/2020] [Indexed: 02/07/2023] Open
Abstract
Infectious diseases are one of the main global public health risks, predominantly caused by viruses, bacteria, fungi, and parasites. The control of infections is founded on three main pillars: prevention, treatment, and diagnosis. However, the appearance of microbial resistance has challenged traditional strategies and demands new approaches. Dendrimers are a type of polymeric nanoparticles whose nanometric size, multivalency, biocompatibility, and structural perfection offer boundless possibilities in multiple biomedical applications. This review provides the reader a general overview about the uses of dendrimers and dendritic materials in the treatment, prevention, and diagnosis of highly prevalent infectious diseases, and their advantages compared to traditional approaches. Examples of dendrimers as antimicrobial agents per se, as nanocarriers of antimicrobial drugs, as well as their uses in gene transfection, in vaccines or as contrast agents in imaging assays are presented. Despite the need to address some challenges in order to be used in the clinic, dendritic materials appear as an innovative tool with a brilliant future ahead in the clinical management of infectious diseases and many other health issues.
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Affiliation(s)
- Miguel Ángel Ortega
- Department of Medicine and Medical Specialities, Faculty of Medicine and Health Sciences, University of Alcalá, 28801 Alcalá de Henares, Spain; (M.Á.O.); (A.G.M.); (O.F.-M.); (L.P.); (N.G.-H.); (M.Á.-M.); (J.B.)
- Institute Ramón y Cajal for Health Research (IRYCIS), 28034 Madrid, Spain
- Tumour Registry, Pathological Anatomy Service, University Hospital Príncipe de Asturias, 28805 Alcalá de Henares, Spain
- University Center for the Defense of Madrid (CUD-ACD), 28047 Madrid, Spain
| | - Alberto Guzmán Merino
- Department of Medicine and Medical Specialities, Faculty of Medicine and Health Sciences, University of Alcalá, 28801 Alcalá de Henares, Spain; (M.Á.O.); (A.G.M.); (O.F.-M.); (L.P.); (N.G.-H.); (M.Á.-M.); (J.B.)
| | - Oscar Fraile-Martínez
- Department of Medicine and Medical Specialities, Faculty of Medicine and Health Sciences, University of Alcalá, 28801 Alcalá de Henares, Spain; (M.Á.O.); (A.G.M.); (O.F.-M.); (L.P.); (N.G.-H.); (M.Á.-M.); (J.B.)
| | - Judith Recio-Ruiz
- Department of Organic and Inorganic Chemistry, Faculty of Sciences, and Research Institute in Chemistry “Andrés M. del Río” (IQAR), University of Alcalá, 28801 Alcalá de Henares, Spain;
| | - Leonel Pekarek
- Department of Medicine and Medical Specialities, Faculty of Medicine and Health Sciences, University of Alcalá, 28801 Alcalá de Henares, Spain; (M.Á.O.); (A.G.M.); (O.F.-M.); (L.P.); (N.G.-H.); (M.Á.-M.); (J.B.)
| | - Luis G. Guijarro
- Department of Systems Biology, Faculty of Medicine and Health Sciences, University of Alcalá, 28801 Alcalá de Henares, Spain;
- Networking Research Centre on Hepatic and Digestive Diseases (CIBER-EHD), 28029 Madrid, Spain
| | - Natalio García-Honduvilla
- Department of Medicine and Medical Specialities, Faculty of Medicine and Health Sciences, University of Alcalá, 28801 Alcalá de Henares, Spain; (M.Á.O.); (A.G.M.); (O.F.-M.); (L.P.); (N.G.-H.); (M.Á.-M.); (J.B.)
- Institute Ramón y Cajal for Health Research (IRYCIS), 28034 Madrid, Spain
- University Center for the Defense of Madrid (CUD-ACD), 28047 Madrid, Spain
| | - Melchor Álvarez-Mon
- Department of Medicine and Medical Specialities, Faculty of Medicine and Health Sciences, University of Alcalá, 28801 Alcalá de Henares, Spain; (M.Á.O.); (A.G.M.); (O.F.-M.); (L.P.); (N.G.-H.); (M.Á.-M.); (J.B.)
- Institute Ramón y Cajal for Health Research (IRYCIS), 28034 Madrid, Spain
- University Center for the Defense of Madrid (CUD-ACD), 28047 Madrid, Spain
- Immune System Diseases-Rheumatology, Oncology and Medicine Service, University Hospital Príncipe de Asturias, 28805 Alcalá de Henares, Madrid, Spain
| | - Julia Buján
- Department of Medicine and Medical Specialities, Faculty of Medicine and Health Sciences, University of Alcalá, 28801 Alcalá de Henares, Spain; (M.Á.O.); (A.G.M.); (O.F.-M.); (L.P.); (N.G.-H.); (M.Á.-M.); (J.B.)
- Institute Ramón y Cajal for Health Research (IRYCIS), 28034 Madrid, Spain
- Tumour Registry, Pathological Anatomy Service, University Hospital Príncipe de Asturias, 28805 Alcalá de Henares, Spain
- University Center for the Defense of Madrid (CUD-ACD), 28047 Madrid, Spain
| | - Sandra García-Gallego
- Institute Ramón y Cajal for Health Research (IRYCIS), 28034 Madrid, Spain
- Department of Organic and Inorganic Chemistry, Faculty of Sciences, and Research Institute in Chemistry “Andrés M. del Río” (IQAR), University of Alcalá, 28801 Alcalá de Henares, Spain;
- Correspondence:
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Schneider R, Primon-Barros M, Von Borowski RG, Chat S, Nonin-Lecomte S, Gillet R, Macedo AJ. Pseudonajide peptide derived from snake venom alters cell envelope integrity interfering on biofilm formation in Staphylococcus epidermidis. BMC Microbiol 2020; 20:237. [PMID: 32746783 PMCID: PMC7397659 DOI: 10.1186/s12866-020-01921-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Accepted: 07/24/2020] [Indexed: 12/12/2022] Open
Abstract
Background The increase in bacterial resistance phenotype cases is a global health problem. New strategies must be explored by the scientific community in order to create new treatment alternatives. Animal venoms are a good source for antimicrobial peptides (AMPs), which are excellent candidates for new antimicrobial drug development. Cathelicidin-related antimicrobial peptides (CRAMPs) from snake venoms have been studied as a model for the design of new antimicrobial pharmaceuticals against bacterial infections. Results In this study we present an 11 amino acid-long peptide, named pseudonajide, which is derived from a Pseudonaja textilis venom peptide and has antimicrobial and antibiofilm activity against Staphylococcus epidermidis. Pseudonajide was selected based on the sequence alignments of various snake venom peptides that displayed activity against bacteria. Antibiofilm activity assays with pseudonajide concentrations ranging from 3.12 to 100 μM showed that the lowest concentration to inhibit biofilm formation was 25 μM. Microscopy analysis demonstrated that pseudonajide interacts with the bacterial cell envelope, disrupting the cell walls and membranes, leading to morphological defects in prokaryotes. Conclusions Our results suggest that pseudonajide’s positives charges interact with negatively charged cell wall components of S. epidermidis, leading to cell damage and inhibiting biofilm formation.
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Affiliation(s)
- Rafael Schneider
- Université de Rennes, CNRS, Institut de Génétique et Développement de Rennes (IGDR), UMR 6290, Rennes, France.,Laboratório de Biofilmes e Diversidade Microbiana, Faculdade de Farmácia and Centro de Biotecnologia, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Muriel Primon-Barros
- Laboratório de Biofilmes e Diversidade Microbiana, Faculdade de Farmácia and Centro de Biotecnologia, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Rafael Gomes Von Borowski
- Université de Rennes, CNRS, Institut de Génétique et Développement de Rennes (IGDR), UMR 6290, Rennes, France.,Laboratório de Biofilmes e Diversidade Microbiana, Faculdade de Farmácia and Centro de Biotecnologia, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Sophie Chat
- Université de Rennes, CNRS, Institut de Génétique et Développement de Rennes (IGDR), UMR 6290, Rennes, France
| | - Sylvie Nonin-Lecomte
- Faculté de Pharmacie, Université de Paris, CNRS, CiTCoM, UMR 8038, Paris, France
| | - Reynald Gillet
- Université de Rennes, CNRS, Institut de Génétique et Développement de Rennes (IGDR), UMR 6290, Rennes, France.
| | - Alexandre José Macedo
- Laboratório de Biofilmes e Diversidade Microbiana, Faculdade de Farmácia and Centro de Biotecnologia, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.
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Mukhopadhyay S, Bharath Prasad AS, Mehta CH, Nayak UY. Antimicrobial peptide polymers: no escape to ESKAPE pathogens-a review. World J Microbiol Biotechnol 2020; 36:131. [PMID: 32737599 PMCID: PMC7395033 DOI: 10.1007/s11274-020-02907-1] [Citation(s) in RCA: 43] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2020] [Accepted: 07/26/2020] [Indexed: 01/01/2023]
Abstract
Antimicrobial resistance (AMR) is one of the significant clinical challenges and also an emerging area of concern arising from nosocomial infections of ESKAPE pathogens, which has been on the rise in both the developed and developing countries alike. These pathogens/superbugs can undergo rapid mutagenesis, which helps them to generate resistance against antimicrobials in addition to the patient's non-adherence to the antibiotic regimen. Sticking to the idea of a 'one-size-fits-all' approach has led to the inappropriate administration of antibiotics resulting in augmentation of antimicrobial resistance. Antimicrobial peptides (AMPs) are the natural host defense peptides that have gained attention in the field of AMR, and recently, synthetic AMPs are well studied to overcome the drawbacks of natural counterparts. This review deals with the novel techniques utilizing the bacteriolytic activity of natural AMPs. The effective localization of these peptides onto the negatively charged bacterial surface by using nanocarriers and structurally nanoengineered antimicrobial peptide polymers (SNAPPs) owing to its smaller size and better antimicrobial activity is also described here.
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Affiliation(s)
- Songhita Mukhopadhyay
- Department of Pharmaceutics, Manipal College of Pharmaceutical Sciences, Manipal Academy of Higher Education, Manipal, Karnataka, 576104, India
| | - A S Bharath Prasad
- Department of Ageing Research, Manipal School of Life Sciences, Manipal Academy of Higher Education, Manipal, Karnataka, 576104, India
| | - Chetan H Mehta
- Department of Pharmaceutics, Manipal College of Pharmaceutical Sciences, Manipal Academy of Higher Education, Manipal, Karnataka, 576104, India
| | - Usha Y Nayak
- Department of Pharmaceutics, Manipal College of Pharmaceutical Sciences, Manipal Academy of Higher Education, Manipal, Karnataka, 576104, India.
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36
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Yuan Q, Wang Y, Yao P, Lv J, Wang Q, Sun F, Feng W. Effect of unsymmetrical oligo-phenylene-ethynylene OPE3 against multidrug-resistant bacteria in vitro and in vivo. J Chemother 2020; 33:156-164. [PMID: 32460634 DOI: 10.1080/1120009x.2020.1770026] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The rapid proliferation of multidrug-resistant (MDR) bacterial infections has posed the serious health threats. Photodynamic therapy is considered one of the most promising therapeutic strategies for combating bacterial resistance. In the present study, we synthesized an unsymmetrical oligo-p-phenylene ethynylene (OPE), namely OPE3, and investigated its antimicrobial activity against gram-negative and gram-positive MDR bacteria in vitro and in vivo. The results showed that OPE3 had marked antibacterial activity against MDR bacteria under light irradiation conditions. OPE3 exerted a slightly greater effect on gram-positive bacteria than gram-negative bacteria. Biofilm assay results showed that OPE3 could not inhibit biofilm formation at sub-minimum inhibitory concentrations (MICs), whereas a significant decrease in preformed biofilms was observed when they were treated with OPE3 at concentrations ≥2 × MIC. OPE3 had no hemolytic activity or cytotoxicity in mammalian cells at low concentrations. In the mouse model of burn infection caused by Pseudomonas aeruginosa and Staphylococcus aureus, the treatment of infected wounds with OPE3 resulted in a significant dose-dependent reduction in the bacterial load and caused smaller skin lesions. In addition, the levels of the inflammatory cytokines TNF-α and IL-6 in the serum were also significantly reduced. The present study results indicate that OPE3 may serve as a potent antimicrobial molecule for the treatment of MDR bacterial infections.
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Affiliation(s)
- Qian Yuan
- Department of Pharmacy, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China
| | - Yu Wang
- Department of Pharmacy, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China
| | - Pu Yao
- Department of Pharmacy, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China
| | - Jun Lv
- Department of Pharmacy, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China
| | - Qianmei Wang
- Department of Pharmacy, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China
| | - Fengjun Sun
- Department of Pharmacy, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China
| | - Wei Feng
- Department of Pharmacy, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China
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Ultrashort Cationic Lipopeptides-Effect of N-Terminal Amino Acid and Fatty Acid Type on Antimicrobial Activity and Hemolysis. Molecules 2020; 25:molecules25020257. [PMID: 31936341 PMCID: PMC7024302 DOI: 10.3390/molecules25020257] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2019] [Revised: 12/31/2019] [Accepted: 01/02/2020] [Indexed: 01/28/2023] Open
Abstract
Ultrashort cationic lipopeptides (USCLs) are promising antimicrobial agents that hypothetically may be alternatively used to combat pathogens such as bacteria and fungi. In general, USCLs consist of fatty acid chains and a few basic amino acid residues. The main shortcoming of USCLs is their relatively high cytotoxicity and hemolytic activity. This study focuses on the impact of the hydrophobic fatty acid chain, on both antimicrobial and hemolytic activities. To learn more about this region, a series of USCLs with different straight-chain fatty acids (C8, C10, C12, C14) attached to the tripeptide with two arginine residues were synthesized. The amino acid at the N-terminal position was exchanged for proteinogenic and non-proteinogenic amino acid residues (24 in total). Moreover, the branched fatty acid residues were conjugated to N-terminus of a dipeptide with two arginine residues. All USCLs had C-terminal amides. USCLs were tested against reference bacterial strains (including ESKAPE group) and Candida albicans. The hemolytic potential was tested on human erythrocytes. Hydrophobicity of the compounds was evaluated by RP-HPLC. Shortening of the fatty acid chain and simultaneous addition of amino acid residue at N-terminus were expected to result in more selective and active compounds than those of the reference lipopeptides with similar lipophilicity. Hypothetically, this approach would also be beneficial to other antimicrobial peptides where N-lipidation strategy was used to improve their biological characteristics.
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Chou S, Wang J, Shang L, Akhtar MU, Wang Z, Shi B, Feng X, Shan A. Short, symmetric-helical peptides have narrow-spectrum activity with low resistance potential and high selectivity. Biomater Sci 2019; 7:2394-2409. [PMID: 30919848 DOI: 10.1039/c9bm00044e] [Citation(s) in RCA: 55] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Broad-spectrum antibiotics have, until now, been the mainstay of antibiotic therapy. However, the increasing threat of drug-resistant bacteria and the ecological imbalance of normal microbial communities have forced a reconsideration of the best strategies to treat such pathogens. Therefore, antibacterial agents with specific abilities of eliminating pathogens may provide long-term protection. Antimicrobial peptides (AMPs), which can be optimized by modifying their primary sequences, are regarded as potentially valuable in development of pathogen-specific agents. To obtain efficient narrow-spectrum AMPs, database-filtering technology, which filters the most probable amino acid composition, positive charge, sequence length and hydrophobic content of peptides against Gram-negative bacteria, was taken as the first step. Then, the filtered parameters were distributed and modified into an α-helical symmetrical structure by considering the structure-function relationship of synthesized antimicrobial peptides. Finally, short, safe and stable peptides against Escherichia coli, Salmonella pullorum and Pseudomonas aeruginosa were successfully identified. The potential peptides F1 and F4 showed low cell toxicity, low resistance potential and low salt sensitivity. CD spectroscopy of the peptides illustrated that F1 and F4 exhibited a tendency towards an α-helical structure in a membrane-mimetic environment. Indeed, fluorescence spectroscopy and electron microscopy analyses indicated that the shorter potential sequence F4 killed the bacteria by causing physical destruction of the bacterial membrane and cytosol leakage. In the mouse model test, F4 reduced the bacterial load in major organs and the cytokine (TNF-α, IL-6, and IL-1β) levels in serum significantly (P < 0.05). Collectively, this symmetric-helical distribution, dependent on database-filtering parameters, is a promising strategy for designing effective smart AMPs with high cell selectivity, and it also provides new insights into the design and optimization of pathogen-specific biomaterials.
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Affiliation(s)
- Shuli Chou
- Laboratory of Molecular Nutrition and Immunity, The Institute of Animal Nutrition, Northeast Agricultural University, Harbin, P. R. China.
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Li C, You X. Coagulation factors: a novel class of endogenous host antimicrobial proteins against drug-resistant gram-negative bacteria. Signal Transduct Target Ther 2019; 4:46. [PMID: 31728211 PMCID: PMC6838306 DOI: 10.1038/s41392-019-0083-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Revised: 09/18/2019] [Accepted: 09/23/2019] [Indexed: 11/08/2022] Open
Affiliation(s)
- Congran Li
- Beijing Key Laboratory of Antimicrobial Agents, Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences & Peking Union Medical College, 100050 Beijing, China
| | - Xuefu You
- Beijing Key Laboratory of Antimicrobial Agents, Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences & Peking Union Medical College, 100050 Beijing, China
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40
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Desloges I, Taylor JA, Leclerc JM, Brannon JR, Portt A, Spencer JD, Dewar K, Marczynski GT, Manges A, Gruenheid S, Le Moual H, Thomassin JL. Identification and characterization of OmpT-like proteases in uropathogenic Escherichia coli clinical isolates. Microbiologyopen 2019; 8:e915. [PMID: 31496120 PMCID: PMC6854850 DOI: 10.1002/mbo3.915] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2019] [Revised: 07/01/2019] [Accepted: 07/06/2019] [Indexed: 01/01/2023] Open
Abstract
Bacterial colonization of the urogenital tract is limited by innate defenses, including the production of antimicrobial peptides (AMPs). Uropathogenic Escherichia coli (UPEC) resist AMP‐killing to cause a range of urinary tract infections (UTIs) including asymptomatic bacteriuria, cystitis, pyelonephritis, and sepsis. UPEC strains have high genomic diversity and encode numerous virulence factors that differentiate them from non‐UTI‐causing strains, including ompT. As OmpT homologs cleave and inactivate AMPs, we hypothesized that UPEC strains from patients with symptomatic UTIs have high OmpT protease activity. Therefore, we measured OmpT activity in 58 clinical E. coli isolates. While heterogeneous OmpT activities were observed, OmpT activity was significantly greater in UPEC strains isolated from patients with symptomatic infections. Unexpectedly, UPEC strains exhibiting the greatest protease activities harbored an additional ompT‐like gene called arlC (ompTp). The presence of two OmpT‐like proteases in some UPEC isolates led us to compare the substrate specificities of OmpT‐like proteases found in E. coli. While all three cleaved AMPs, cleavage efficiency varied on the basis of AMP size and secondary structure. Our findings suggest the presence of ArlC and OmpT in the same UPEC isolate may confer a fitness advantage by expanding the range of target substrates.
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Affiliation(s)
- Isabelle Desloges
- Department of Microbiology and Immunology, McGill University, Montreal, QC, Canada
| | - James A Taylor
- Department of Microbiology and Immunology, McGill University, Montreal, QC, Canada
| | - Jean-Mathieu Leclerc
- Department of Microbiology and Immunology, McGill University, Montreal, QC, Canada
| | - John R Brannon
- Department of Microbiology and Immunology, McGill University, Montreal, QC, Canada
| | - Andrea Portt
- Department of Microbiology and Immunology, McGill University, Montreal, QC, Canada
| | - John D Spencer
- Division of Nephrology, Nationwide Children's Hospital, Columbus, Ohio
| | - Ken Dewar
- Microbiome and Disease Tolerance Centre, McGill University, Montreal, QC, Canada.,Department of Human Genetics, McGill University, Montreal, QC, Canada
| | - Gregory T Marczynski
- Department of Microbiology and Immunology, McGill University, Montreal, QC, Canada.,Microbiome and Disease Tolerance Centre, McGill University, Montreal, QC, Canada
| | - Amee Manges
- School of Population and Public Health, University of British Columbia, Vancouver, BC, Canada
| | - Samantha Gruenheid
- Department of Microbiology and Immunology, McGill University, Montreal, QC, Canada.,Microbiome and Disease Tolerance Centre, McGill University, Montreal, QC, Canada
| | - Hervé Le Moual
- Department of Microbiology and Immunology, McGill University, Montreal, QC, Canada.,Microbiome and Disease Tolerance Centre, McGill University, Montreal, QC, Canada.,Faculty of Dentistry, McGill University, Montreal, QC, Canada
| | - Jenny-Lee Thomassin
- Department of Microbiology and Immunology, McGill University, Montreal, QC, Canada
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Coagulation factors VII, IX and X are effective antibacterial proteins against drug-resistant Gram-negative bacteria. Cell Res 2019; 29:711-724. [PMID: 31399697 PMCID: PMC6796875 DOI: 10.1038/s41422-019-0202-3] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2018] [Accepted: 06/24/2019] [Indexed: 02/05/2023] Open
Abstract
Infections caused by drug-resistant “superbugs” pose an urgent public health threat due to the lack of effective drugs; however, certain mammalian proteins with intrinsic antibacterial activity might be underappreciated. Here, we reveal an antibacterial property against Gram-negative bacteria for factors VII, IX and X, three proteins with well-established roles in initiation of the coagulation cascade. These factors exert antibacterial function via their light chains (LCs). Unlike many antibacterial agents that target cell metabolism or the cytoplasmic membrane, the LCs act by hydrolyzing the major components of bacterial outer membrane, lipopolysaccharides, which are crucial for the survival of Gram-negative bacteria. The LC of factor VII exhibits in vitro efficacy towards all Gram-negative bacteria tested, including extensively drug-resistant (XDR) pathogens, at nanomolar concentrations. It is also highly effective in combating XDR Pseudomonas aeruginosa and Acinetobacter baumannii infections in vivo. Through decoding a unique mechanism whereby factors VII, IX and X behave as antimicrobial proteins, this study advances our understanding of the coagulation system in host defense, and suggests that these factors may participate in the pathogenesis of coagulation disorder-related diseases such as sepsis via their dual functions in blood coagulation and resistance to infection. Furthermore, this study may offer new strategies for combating Gram-negative “superbugs”.
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42
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Pero R, Brancaccio M, Laneri S, Biasi MGD, Lombardo B, Scudiero O. A Novel View of Human Helicobacter pylori Infections: Interplay between Microbiota and Beta-Defensins. Biomolecules 2019; 9:biom9060237. [PMID: 31216758 PMCID: PMC6627275 DOI: 10.3390/biom9060237] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2019] [Revised: 06/11/2019] [Accepted: 06/13/2019] [Indexed: 02/07/2023] Open
Abstract
The gut microbiota is significantly involved in the preservation of the immune system of the host, protecting it against the pathogenic bacteria of the stomach. The correlation between gut microbiota and the host response supports human gastric homeostasis. Gut microbes may be shifted in Helicobacter pylori (Hp)-infected individuals to advance gastric inflammation and distinguished diseases. Particularly interesting is the establishment of cooperation between gut microbiota and antimicrobial peptides (AMPs) of the host in the gastrointestinal tract. AMPs have great importance in the innate immune reactions to Hp and participate in conservative co-evolution with an intricate microbiome. β-Defensins, a class of short, cationic, arginine-rich proteins belonging to the AMP group, are produced by epithelial and immunological cells. Their expression is enhanced during Hp infection. In this review, we discuss the impact of the gut microbiome on the host response, with particular regard to β-defensins in Hp-associated infections. In microbial infections, mostly in precancerous lesions induced by Hp infection, these modifications could lead to different outcomes.
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Affiliation(s)
- Raffaela Pero
- Dipartimento di Medicina Molecolare e Biotecnologie Mediche, Università degli Studi di Napoli "Federico II", 80131 Napoli, Italy.
- Task Force sugli Studi del Microbioma, Università degli Studi di Napoli "Federico II", 80131 Napoli, Italy.
| | - Mariarita Brancaccio
- Department of Biology and Evolution of Marine Organisms, Stazione Zoologica Anton Dohrn, 80121 Napoli, Italy.
| | - Sonia Laneri
- Dipartimento di Farmacia, Università degli Studi di Napoli "Federico II", Via Montesano 49, 80131 Napoli, Italy.
| | | | - Barbara Lombardo
- Dipartimento di Medicina Molecolare e Biotecnologie Mediche, Università degli Studi di Napoli "Federico II", 80131 Napoli, Italy.
- CEINGE-Biotecnologie Avanzate Scarl, Via G. Salvatore 486, 80145 Napoli, Italy.
| | - Olga Scudiero
- Dipartimento di Medicina Molecolare e Biotecnologie Mediche, Università degli Studi di Napoli "Federico II", 80131 Napoli, Italy.
- Task Force sugli Studi del Microbioma, Università degli Studi di Napoli "Federico II", 80131 Napoli, Italy.
- CEINGE-Biotecnologie Avanzate Scarl, Via G. Salvatore 486, 80145 Napoli, Italy.
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43
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Zhou Y, Qiu B, Yin X, Liu H, Zhu L. Concomitant drugs-loaded microcapsules of roxithromycin and theophylline with pH-sensitive controlled-releasing properties. INT J POLYM MATER PO 2019. [DOI: 10.1080/00914037.2019.1596917] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- You Zhou
- Hainan Provincial Fine Chemical Engineering Research Center, Hainan University, Haikou, P.R. China
| | - Bining Qiu
- Hainan Provincial Fine Chemical Engineering Research Center, Hainan University, Haikou, P.R. China
| | - Xueqiong Yin
- Hainan Provincial Fine Chemical Engineering Research Center, Hainan University, Haikou, P.R. China
| | - Haifang Liu
- Affiliated Haikou Hospital, Xiangya School of Medicine central south University, Haikou Municipal People’s Hospital, Haikou, Hainan, 570208, P.R. China
| | - Li Zhu
- Hainan Provincial Fine Chemical Engineering Research Center, Hainan University, Haikou, P.R. China
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44
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Xiao F, Cao B, Wang C, Guo X, Li M, Xing D, Hu X. Pathogen-Specific Polymeric Antimicrobials with Significant Membrane Disruption and Enhanced Photodynamic Damage To Inhibit Highly Opportunistic Bacteria. ACS NANO 2019; 13:1511-1525. [PMID: 30632740 DOI: 10.1021/acsnano.8b07251] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Highly pathogenic Gram-negative bacteria and their drug resistance are a severe public health threat with high mortality. Gram-negative bacteria are hard to kill due to the complex cell envelopes with low permeability and extra defense mechanisms. It is challenging to treat them with current strategies, mainly including antibiotics, peptides, polymers, and some hybrid materials, which still face the issue of drug resistance, limited antibacterial selectivity, and severe side effects. Together with precise bacteria targeting, synergistic therapeutic modalities, including physical membrane damage and photodynamic eradication, are promising to combat Gram-negative bacteria. Herein, pathogen-specific polymeric antimicrobials were formulated from amphiphilic block copolymers, poly(butyl methacrylate)- b-poly(2-(dimethylamino) ethyl methacrylate- co-eosin)- b-ubiquicidin, PBMA- b-P(DMAEMA- co-EoS)-UBI, in which pathogen-targeting peptide ubiquicidin (UBI) was tethered in the hydrophilic chain terminal, and Eosin-Y was copolymerized in the hydrophilic block. The micelles could selectively adhere to bacteria instead of mammalian cells, inserting into the bacteria membrane to induce physical membrane damage and out-diffusion of intracellular milieu. Furthermore, significant in situ generation of reactive oxygen species was observed upon light irradiation, achieving further photodynamic eradication. Broad-spectrum bacterial inhibition was demonstrated for the polymeric antimicrobials, especially highly opportunistic Gram-negative bacteria, such as Pseudomona aeruginosa ( P. aeruginosa) based on the synergy of physical destruction and photodynamic therapy, without detectable resistance. In vivo P. aeruginosa-infected knife injury model and burn model both proved good potency of bacteria eradication and promoted wound healing, which was comparable with commercial antibiotics, yet no risk of drug resistance. It is promising to hurdle the infection and resistance suffered from highly opportunistic bacteria.
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Affiliation(s)
- Fengfeng Xiao
- MOE Key Laboratory of Laser Life Science and Institute of Laser Life Science , South China Normal University , Guangzhou 510631 , China
- College of Biophotonics , South China Normal University , Guangzhou 510631 , China
| | - Bing Cao
- MOE Key Laboratory of Laser Life Science and Institute of Laser Life Science , South China Normal University , Guangzhou 510631 , China
- College of Biophotonics , South China Normal University , Guangzhou 510631 , China
| | - Congyu Wang
- MOE Key Laboratory of Laser Life Science and Institute of Laser Life Science , South China Normal University , Guangzhou 510631 , China
- College of Biophotonics , South China Normal University , Guangzhou 510631 , China
| | - Xujuan Guo
- MOE Key Laboratory of Laser Life Science and Institute of Laser Life Science , South China Normal University , Guangzhou 510631 , China
- College of Biophotonics , South China Normal University , Guangzhou 510631 , China
| | - Mengge Li
- MOE Key Laboratory of Laser Life Science and Institute of Laser Life Science , South China Normal University , Guangzhou 510631 , China
- College of Biophotonics , South China Normal University , Guangzhou 510631 , China
| | - Da Xing
- MOE Key Laboratory of Laser Life Science and Institute of Laser Life Science , South China Normal University , Guangzhou 510631 , China
- College of Biophotonics , South China Normal University , Guangzhou 510631 , China
| | - Xianglong Hu
- MOE Key Laboratory of Laser Life Science and Institute of Laser Life Science , South China Normal University , Guangzhou 510631 , China
- College of Biophotonics , South China Normal University , Guangzhou 510631 , China
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45
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Wang J, Song J, Yang Z, He S, Yang Y, Feng X, Dou X, Shan A. Antimicrobial Peptides with High Proteolytic Resistance for Combating Gram-Negative Bacteria. J Med Chem 2019; 62:2286-2304. [PMID: 30742437 DOI: 10.1021/acs.jmedchem.8b01348] [Citation(s) in RCA: 98] [Impact Index Per Article: 19.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Poor proteolytic resistance is an urgent problem to be solved in the clinical application of antimicrobial peptides (AMPs), yet common solutions, such as complicated chemical modifications and utilization of d-amino acids, greatly increase the difficulty and cost of producing AMPs. In this work, a set of novel peptides was synthesized based on an antitrypsin/antichymotrypsin hydrolytic peptide structure unit (XYPX) n (X represents I, L, and V; Y represents R and K), which was designed using a systematic natural amino acid arrangement. Of these peptides, 16 with seven repeat units had the highest average selectivity index (GMSI = 99.07) for all of the Gram-negative bacteria tested and remained highly effective in combating Escherichia coli infection in vivo. Importantly, 16 also had dramatic resistance to a high concentration of trypsin/chymotrypsin hydrolysis and exerted bactericidal activity through a membrane-disruptive mechanism. Overall, these findings provide new approaches for the development of antiprotease hydrolytic peptides that target Gram-negative bacteria.
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Affiliation(s)
- Jiajun Wang
- Institute of Animal Nutrition , Northeast Agricultural University , Harbin 150030 , P. R. China
| | - Jing Song
- Institute of Animal Nutrition , Northeast Agricultural University , Harbin 150030 , P. R. China
| | - Zhanyi Yang
- Institute of Animal Nutrition , Northeast Agricultural University , Harbin 150030 , P. R. China
| | - Shiqi He
- Institute of Animal Nutrition , Northeast Agricultural University , Harbin 150030 , P. R. China
| | - Yi Yang
- Institute of Animal Nutrition , Northeast Agricultural University , Harbin 150030 , P. R. China
| | - Xingjun Feng
- Institute of Animal Nutrition , Northeast Agricultural University , Harbin 150030 , P. R. China
| | - Xiujing Dou
- Institute of Animal Nutrition , Northeast Agricultural University , Harbin 150030 , P. R. China
| | - Anshan Shan
- Institute of Animal Nutrition , Northeast Agricultural University , Harbin 150030 , P. R. China
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46
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Encinas N, Angulo M, Astorga C, Colilla M, Izquierdo-Barba I, Vallet-Regí M. Mixed-charge pseudo-zwitterionic mesoporous silica nanoparticles with low-fouling and reduced cell uptake properties. Acta Biomater 2019; 84:317-327. [PMID: 30529082 PMCID: PMC6718287 DOI: 10.1016/j.actbio.2018.12.012] [Citation(s) in RCA: 54] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2018] [Revised: 11/26/2018] [Accepted: 12/05/2018] [Indexed: 12/31/2022]
Abstract
The design of drug delivery systems needs to consider biocompatibility and host body recognition for an adequate actuation. In this work, mesoporous silica nanoparticles (MSNs) surfaces were successfully modified with two silane molecules to provide mixed-charge brushes (-NH3⊕/-PO3⊝) and well evaluated in terms of surface properties, low-fouling capability and cell uptake in comparison to PEGylated MSNs. The modification process consists in the simultaneous direct-grafting of hydrolysable short chain amino (aminopropyl silanetriol, APST) and phosphonate-based (trihydroxy-silyl-propyl-methyl-phosphonate, THSPMP) silane molecules able to provide a pseudo-zwitterionic nature under physiological pH conditions. Results confirmed that both mixed-charge pseudo-zwitterionic MSNs (ZMSN) and PEG-MSN display a significant reduction of serum protein adhesion and macrophages uptake with respect to pristine MSNs. In the case of ZMSNs, this reduction is up to a 70-90% for protein adsorption and c.a. 60% for cellular uptake. This pseudo-zwitterionic modification has been focused on the aim of local treatment of bacterial infections through the synergistic effect between the inherent antimicrobial effect of mixed-charge system and the levofloxacin antibiotic release profile. These findings open promising future expectations for the effective treatment of bacterial infections through the use of mixed-charge pseudo-zwitterionic MSNs furtive to macrophages and with antimicrobial properties. STATEMENT OF SIGNIFICANCE: Herein a novel antimicrobial mixed-charge pseudo-zwitterionic MSNs based system with low-fouling and reduced cell uptake behavior has been developed. This chemical modification has been performed by the simultaneous grafting of short chain organosilanes, containing amino and phosphonate groups, respectively. This nanocarrier has been tested for local infection treatment through the synergy between the antimicrobial effect of mixed-charge brushes and the levofloxacin antibiotic release profile.
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Affiliation(s)
- Noemí Encinas
- Chemistry in Pharmaceutical Sciences Department, Inorganic and Bioinorganic Chemistry Unit, Universidad Complutense de Madrid, Instituto de Investigación Sanitaria Hospital 12 de Octubre i+12, Plaza Ramón y Cajal s/n, 28040 Madrid, Spain
| | - Mercedes Angulo
- Chemistry in Pharmaceutical Sciences Department, Inorganic and Bioinorganic Chemistry Unit, Universidad Complutense de Madrid, Instituto de Investigación Sanitaria Hospital 12 de Octubre i+12, Plaza Ramón y Cajal s/n, 28040 Madrid, Spain
| | - Carlos Astorga
- Chemistry in Pharmaceutical Sciences Department, Inorganic and Bioinorganic Chemistry Unit, Universidad Complutense de Madrid, Instituto de Investigación Sanitaria Hospital 12 de Octubre i+12, Plaza Ramón y Cajal s/n, 28040 Madrid, Spain
| | - Montserrat Colilla
- Chemistry in Pharmaceutical Sciences Department, Inorganic and Bioinorganic Chemistry Unit, Universidad Complutense de Madrid, Instituto de Investigación Sanitaria Hospital 12 de Octubre i+12, Plaza Ramón y Cajal s/n, 28040 Madrid, Spain; CIBER Bioengineering, Biomaterials and Nanomedicine, CIBER-BBN, Madrid, Spain
| | - Isabel Izquierdo-Barba
- Chemistry in Pharmaceutical Sciences Department, Inorganic and Bioinorganic Chemistry Unit, Universidad Complutense de Madrid, Instituto de Investigación Sanitaria Hospital 12 de Octubre i+12, Plaza Ramón y Cajal s/n, 28040 Madrid, Spain; CIBER Bioengineering, Biomaterials and Nanomedicine, CIBER-BBN, Madrid, Spain.
| | - María Vallet-Regí
- Chemistry in Pharmaceutical Sciences Department, Inorganic and Bioinorganic Chemistry Unit, Universidad Complutense de Madrid, Instituto de Investigación Sanitaria Hospital 12 de Octubre i+12, Plaza Ramón y Cajal s/n, 28040 Madrid, Spain; CIBER Bioengineering, Biomaterials and Nanomedicine, CIBER-BBN, Madrid, Spain.
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Chouirfa H, Bouloussa H, Migonney V, Falentin-Daudré C. Review of titanium surface modification techniques and coatings for antibacterial applications. Acta Biomater 2019; 83:37-54. [PMID: 30541702 DOI: 10.1016/j.actbio.2018.10.036] [Citation(s) in RCA: 446] [Impact Index Per Article: 89.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2018] [Revised: 10/09/2018] [Accepted: 10/23/2018] [Indexed: 02/07/2023]
Abstract
Implanted biomaterials play a key role in the current success of orthopedic and dental procedures. Pure titanium and its alloys are the most commonly used materials for permanent implants in contact with bone. However, implant-related infections remain among the leading reasons for failure. The most critical pathogenic event in the development of infection on biomaterials is biofilm formation, which starts immediately after bacterial adhesion. In the last decade, numerous studies reported the ability of titanium surface modifications and coatings to minimize bacterial adhesion, inhibit biofilm formation and provide effective bacterial killing to protect implanted biomaterials. In the present review, the different strategies to prevent infection onto titanium surfaces are reported: surface modification and coatings by antibiotics, antimicrobial peptides, inorganic antibacterial metal elements and antibacterial polymers. STATEMENT OF SIGNIFICANCE: Implanted biomaterials play a key role in the current success of orthopedic and dental procedures. Pure titanium and its alloys are the most commonly used materials for permanent implants in contact with bone. Microbial infection is one of the main causes of implant failure. Currently, the global infection risk is 2-5% in orthopedic surgery. Numerous solutions exist to render titanium surfaces antibacterial. The LBPS team is an expert on the functionalization of titanium surfaces by using bioactive polymers to improve the biologiocal response. In this review, the different strategies to prevent infection are reported onto titanium and titanium alloy surfaces such as surface modification by antibiotics, antimicrobial peptides, inorganic antibacterial metal elements and antibacterial polymers.
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Neundorf I. Antimicrobial and Cell-Penetrating Peptides: How to Understand Two Distinct Functions Despite Similar Physicochemical Properties. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2019; 1117:93-109. [PMID: 30980355 DOI: 10.1007/978-981-13-3588-4_7] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Antimicrobial and cell-penetrating peptides are both classes of membrane-active peptides sharing similar physicochemical properties. Both kinds of peptides have attracted much attention owing to their specific features. AMPs disrupt cell membranes of bacteria and display urgently needed antibiotic substances with alternative modes of action. Since the multidrug resistance of bacterial pathogens is a more and more raising concern, AMPs have gained much interest during the past years. On the other side, CPPs enter eukaryotic cells without substantially affecting the plasma membrane. They can be used as drug delivery platforms and have proven their usefulness in various applications. However, although both groups of peptides are quite similar, their intrinsic activity is often different, and responsible factors are still in discussion. The aim of this chapter is to summarize and shed light on recent findings and concepts dealing with differences and similarities of AMPs and CPPs and to understand these different functions.
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Affiliation(s)
- Ines Neundorf
- Department of Chemistry, Institute for Biochemistry, University of Cologne, Cologne, Germany.
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Loxosceles gaucho Spider Venom: An Untapped Source of Antimicrobial Agents. Toxins (Basel) 2018; 10:toxins10120522. [PMID: 30563217 PMCID: PMC6316817 DOI: 10.3390/toxins10120522] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2018] [Revised: 11/14/2018] [Accepted: 11/29/2018] [Indexed: 12/12/2022] Open
Abstract
The remarkable ability of microorganisms to develop resistance to conventional antibiotics is one of the biggest challenges that the pharmaceutical industry currently faces. Recent studies suggest that antimicrobial peptides discovered in spider venoms may be useful resources for the design of structurally new anti-infective agents effective against drug-resistant microorganisms. In this work, we found an anionic antibacterial peptide named U1-SCRTX-Lg1a in the venom of the spider Loxosceles gaucho. The peptide was purified using high-performance liquid chromatography (HPLC), its antimicrobial activity was tested through liquid growth inhibition assays, and its chemical properties were characterized using mass spectrometry. U1-SCRTX-Lg1a was found to show a monoisotopic mass of 1695.75 Da, activity against Gram-negative bacteria, a lack of hemolytic effects against human red blood cells, and a lack of cytotoxicity against human cervical carcinoma cells (HeLa). Besides this, the sequence of the peptide exhibited great similarity to specific regions of phospholipases D from different species of Loxosceles spiders, leading to the hypothesis that U1-SCRTX-Lg1a may have originated from a limited proteolytic cleavage. Our data suggest that U1-SCRTX-Lg1a is a promising candidate for the development of new antibiotics that could help fight bacterial infections and represents an exciting discovery for Loxosceles spiders.
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Dorman MJ, Feltwell T, Goulding DA, Parkhill J, Short FL. The Capsule Regulatory Network of Klebsiella pneumoniae Defined by density-TraDISort. mBio 2018; 9:e01863-18. [PMID: 30459193 PMCID: PMC6247091 DOI: 10.1128/mbio.01863-18] [Citation(s) in RCA: 63] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2018] [Accepted: 10/08/2018] [Indexed: 01/04/2023] Open
Abstract
Klebsiella pneumoniae infections affect infants and the immunocompromised, and the recent emergence of hypervirulent and multidrug-resistant K. pneumoniae lineages is a critical health care concern. Hypervirulence in K. pneumoniae is mediated by several factors, including the overproduction of extracellular capsule. However, the full details of how K. pneumoniae capsule biosynthesis is achieved or regulated are not known. We have developed a robust and sensitive procedure to identify genes influencing capsule production, density-TraDISort, which combines density gradient centrifugation with transposon insertion sequencing. We have used this method to explore capsule regulation in two clinically relevant Klebsiella strains, K. pneumoniae NTUH-K2044 (capsule type K1) and K. pneumoniae ATCC 43816 (capsule type K2). We identified multiple genes required for full capsule production in K. pneumoniae, as well as putative suppressors of capsule in NTUH-K2044, and have validated the results of our screen with targeted knockout mutants. Further investigation of several of the K. pneumoniae capsule regulators identified-ArgR, MprA/KvrB, SlyA/KvrA, and the Sap ABC transporter-revealed effects on capsule amount and architecture, serum resistance, and virulence. We show that capsule production in K. pneumoniae is at the center of a complex regulatory network involving multiple global regulators and environmental cues and that the majority of capsule regulatory genes are located in the core genome. Overall, our findings expand our understanding of how capsule is regulated in this medically important pathogen and provide a technology that can be easily implemented to study capsule regulation in other bacterial species.IMPORTANCE Capsule production is essential for K. pneumoniae to cause infections, but its regulation and mechanism of synthesis are not fully understood in this organism. We have developed and applied a new method for genome-wide identification of capsule regulators. Using this method, many genes that positively or negatively affect capsule production in K. pneumoniae were identified, and we use these data to propose an integrated model for capsule regulation in this species. Several of the genes and biological processes identified have not previously been linked to capsule synthesis. We also show that the methods presented here can be applied to other species of capsulated bacteria, providing the opportunity to explore and compare capsule regulatory networks in other bacterial strains and species.
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Affiliation(s)
- Matthew J Dorman
- Wellcome Sanger Institute, Hinxton, Cambridgeshire, United Kingdom
| | - Theresa Feltwell
- Wellcome Sanger Institute, Hinxton, Cambridgeshire, United Kingdom
| | - David A Goulding
- Wellcome Sanger Institute, Hinxton, Cambridgeshire, United Kingdom
| | - Julian Parkhill
- Wellcome Sanger Institute, Hinxton, Cambridgeshire, United Kingdom
| | - Francesca L Short
- Wellcome Sanger Institute, Hinxton, Cambridgeshire, United Kingdom
- Department of Medicine, University of Cambridge, Cambridge, United Kingdom
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