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Padhy I, Dwibedy SK, Mohapatra SS. A molecular overview of the polymyxin-LPS interaction in the context of its mode of action and resistance development. Microbiol Res 2024; 283:127679. [PMID: 38508087 DOI: 10.1016/j.micres.2024.127679] [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: 07/31/2023] [Revised: 03/03/2024] [Accepted: 03/06/2024] [Indexed: 03/22/2024]
Abstract
With the rising incidences of antimicrobial resistance (AMR) and the diminishing options of novel antimicrobial agents, it is paramount to decipher the molecular mechanisms of action and the emergence of resistance to the existing drugs. Polymyxin, a cationic antimicrobial lipopeptide, is used to treat infections by Gram-negative bacterial pathogens as a last option. Though polymyxins were identified almost seventy years back, their use has been restricted owing to toxicity issues in humans. However, their clinical use has been increasing in recent times resulting in the rise of polymyxin resistance. Moreover, the detection of "mobile colistin resistance (mcr)" genes in the environment and their spread across the globe have complicated the scenario. The mechanism of polymyxin action and the development of resistance is not thoroughly understood. Specifically, the polymyxin-bacterial lipopolysaccharide (LPS) interaction is a challenging area of investigation. The use of advanced biophysical techniques and improvement in molecular dynamics simulation approaches have furthered our understanding of this interaction, which will help develop polymyxin analogs with better bactericidal effects and lesser toxicity in the future. In this review, we have delved deeper into the mechanisms of polymyxin-LPS interactions, highlighting several models proposed, and the mechanisms of polymyxin resistance development in some of the most critical Gram-negative pathogens.
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Affiliation(s)
- Indira Padhy
- Molecular Microbiology Lab, Department of Biotechnology, Berhampur University, Bhanja Bihar, Berhampur 760007, Odisha, India
| | - Sambit K Dwibedy
- Molecular Microbiology Lab, Department of Biotechnology, Berhampur University, Bhanja Bihar, Berhampur 760007, Odisha, India
| | - Saswat S Mohapatra
- Molecular Microbiology Lab, Department of Biotechnology, Berhampur University, Bhanja Bihar, Berhampur 760007, Odisha, India.
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Kumaraswamy M, Riestra A, Flores A, Uchiyama S, Dahesh S, Bondsäter G, Nilsson V, Chang M, Seo H, Sakoulas G, Nizet V. Unrecognized Potent Activities of Colistin Against Clinically Important mcr+ Enterobacteriaceae Revealed in Synergy with Host Immunity. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.03.21.533661. [PMID: 36993410 PMCID: PMC10055327 DOI: 10.1101/2023.03.21.533661] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/31/2023]
Abstract
Colistin (COL) is a cationic cyclic peptide that disrupts negatively-charged bacterial cell membranes and frequently serves as an antibiotic of last resort to combat multidrug-resistant Gram-negative bacterial infections. Emergence of the horizontally transferable plasmid-borne mobilized colistin resistance (mcr) determinant and its spread to Gram-negative strains harboring extended-spectrum β-lactamase and carbapenemase resistance genes threatens futility of our chemotherapeutic arsenal. COL is widely regarded to have zero activity against mcr+ patients based on standard antimicrobial susceptibility testing (AST) performed in enriched bacteriological growth media; consequently, the drug is withheld from patients with mcr+ infections. However, these standard testing media poorly mimic in vivo physiology and omit host immune factors. Here we report previously unrecognized bactericidal activities of COL against mcr-1+ isolates of Escherichia coli (EC), Klebsiella pneumoniae (KP), and Salmonella enterica (SE) in standard tissue culture media containing the physiological buffer bicarbonate. Moreover, COL promoted serum complement deposition on the mcr-1+ Gram-negative bacterial surface and synergized potently with active human serum in pathogen killing. At COL concentrations readily achievable with standard dosing, the peptide antibiotic killed mcr-1+ EC, KP, and SE in freshly isolated human blood proved effective as monotherapy in a murine model of mcr-1+ EC bacteremia. Our results suggest that COL, currently ignored as a treatment option based on traditional AST, may in fact benefit patients with mcr-1+ Gram negative infections based on evaluations performed in a more physiologic context. These concepts warrant careful consideration in the clinical microbiology laboratory and for future clinical investigation of their merits in high risk patients with limited therapeutic options.
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Affiliation(s)
- Monika Kumaraswamy
- Division of Infectious Diseases and Global Public Health, Department of Medicine, UC San Diego, La Jolla, CA, USA
- Infectious Diseases Section, VA San Diego Healthcare System, San Diego, CA, USA
| | - Angelica Riestra
- Department of Biology, San Diego State University, San Diego, CA, USA
- Division of Host-Microbe Systems and Therapeutics, Department of Pediatrics, UC San Diego, La Jolla, CA, USA
| | - Anabel Flores
- Division of Host-Microbe Systems and Therapeutics, Department of Pediatrics, UC San Diego, La Jolla, CA, USA
- Department of Biological Sciences, California Baptist University, Riverside, CA, USA
| | - Satoshi Uchiyama
- Division of Host-Microbe Systems and Therapeutics, Department of Pediatrics, UC San Diego, La Jolla, CA, USA
| | - Samira Dahesh
- Division of Host-Microbe Systems and Therapeutics, Department of Pediatrics, UC San Diego, La Jolla, CA, USA
| | - Gunnar Bondsäter
- Division of Host-Microbe Systems and Therapeutics, Department of Pediatrics, UC San Diego, La Jolla, CA, USA
- Faculty of Medicine, Lund University, Lund, Sweden
| | - Victoria Nilsson
- Division of Host-Microbe Systems and Therapeutics, Department of Pediatrics, UC San Diego, La Jolla, CA, USA
- Faculty of Medicine, Lund University, Lund, Sweden
| | - Melanie Chang
- Division of Host-Microbe Systems and Therapeutics, Department of Pediatrics, UC San Diego, La Jolla, CA, USA
- School of Medicine, China Medical University, Taichung, Taiwan
| | - Hideya Seo
- Division of Host-Microbe Systems and Therapeutics, Department of Pediatrics, UC San Diego, La Jolla, CA, USA
- Department of Anesthesia, Kyoto University, Kyoto, Japan
| | - George Sakoulas
- Division of Host-Microbe Systems and Therapeutics, Department of Pediatrics, UC San Diego, La Jolla, CA, USA
- Sharp Rees Stealy Medical Group, San Diego, CA, USA
| | - Victor Nizet
- Division of Host-Microbe Systems and Therapeutics, Department of Pediatrics, UC San Diego, La Jolla, CA, USA
- Skaggs School of Pharmacy and Pharmaceutical Sciences, UC San Diego, La Jolla, CA, USA
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3
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Qian C, Wu Q, Ruan Z, Liu F, Li W, Shi W, Ma L, Peng D, Yin H, Yao L, Li Z, Hong M, Xia L. A Visualized Mortality Prediction Score Model in Hematological Malignancies Patients with Carbapenem-Resistant Organisms Bloodstream Infection. Infect Drug Resist 2023; 16:201-215. [PMID: 36644657 PMCID: PMC9833326 DOI: 10.2147/idr.s393932] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2022] [Accepted: 12/30/2022] [Indexed: 01/09/2023] Open
Abstract
Background Bloodstream infection (BSI) due to carbapenem-resistant organisms (CROs) has emerged as a worldwide problem associated with high mortality. This study aimed to evaluate the risk factors associated with mortality in HM patients with CROs BSI and to establish a scoring model for early mortality prediction. Methods We conducted a retrospective cohort study at our hematological department from January 2018 to December 2021, including all HM patients with CROs BSI. The outcome measured was death within 30-day of BSI onset. Survivor and non-survivor subgroups were compared to identify predictors of mortality. Univariate and multivariate Cox regression analyses were used to identify prognostic risk factors and develop a nomogram. Results In total, 150 HM patients were included in the study showing an overall 30-day mortality rate of 56%. Klebsiella pneumonia was the dominant episode. Cox regression analysis showed that pre-infection length of stay was >14 days (score 41), Pitt score >4 (score 100), mucositis (score 41), CAR (The ratio of C-reactive protein to albumin) >8.8 (score 57), early definitive therapy (score 44), and long-duration (score 78) were positive independent risk predictors associated with 30-day mortality, all of which were selected into the nomogram. Furthermore, all patients were divided into the high-risk group (≥160 points) or the low-risk group based on the prediction score model. The mortality of the high-risk group was 8 times more than the low-risk group. Kaplan-Meier analysis showed that empirical polymyxin B therapy was associated with a lower 30-day mortality rate, which was identified as a good prognostic factor in the high-risk group. In comparison, empirical carbapenems and tigecycline were poor prognostic factors in a low-risk group. Conclusion Our score model can accurately predict 30-day mortality in HM patients with CROs BSI. Early administration of CROs-targeted therapy in the high-risk group is strongly recommended to decrease mortality.
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Affiliation(s)
- Chenjing Qian
- Institute of Hematology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430022, People’s Republic of China
| | - Qiuling Wu
- Institute of Hematology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430022, People’s Republic of China
| | - Zhixuan Ruan
- Faculty of Natural, Mathematical and Engineering Sciences, King’s College, London, UK
| | - Fang Liu
- Institute of Hematology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430022, People’s Republic of China
| | - Weiming Li
- Institute of Hematology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430022, People’s Republic of China
| | - Wei Shi
- Institute of Hematology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430022, People’s Republic of China
| | - Ling Ma
- Department of Clinical Laboratory, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, People’s Republic of China
| | - Danyue Peng
- Institute of Hematology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430022, People’s Republic of China
| | - Hua Yin
- Institute of Hematology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430022, People’s Republic of China
| | - Lan Yao
- Institute of Hematology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430022, People’s Republic of China
| | - Zixuan Li
- Institute of Hematology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430022, People’s Republic of China
| | - Mei Hong
- Institute of Hematology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430022, People’s Republic of China,Collaborative Innovation Center of Hematology, Soochow University, Suzhou, People’s Republic of China,Correspondence: Mei Hong; Linghui Xia, Institute of Hematology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Jiefang Road No. 1277, Wuhan, Hubei Province, People’s Republic of China, Tel +8613037137937; +8618627733999, Email ;
| | - Linghui Xia
- Institute of Hematology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430022, People’s Republic of China
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4
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Peptides Isolated from Amphibian Skin Secretions with Emphasis on Antimicrobial Peptides. Toxins (Basel) 2022; 14:toxins14100722. [PMID: 36287990 PMCID: PMC9607450 DOI: 10.3390/toxins14100722] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2022] [Revised: 10/07/2022] [Accepted: 10/19/2022] [Indexed: 11/19/2022] Open
Abstract
The skin of amphibians is a tissue with biological functions, such as defense, respiration, and excretion. In recent years, researchers have discovered a large number of peptides in the skin secretions of amphibians, including antimicrobial peptides, antioxidant peptides, bradykinins, insulin-releasing peptides, and other peptides. This review focuses on the origin, primary structure, secondary structure, length, and functions of peptides secreted from amphibians' skin. We hope that this review will provide further information and promote the further study of amphibian skin secretions, in order to provide reference for expanding the research and application of amphibian bioactive peptides.
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Immunomodulatory and Allergenic Properties of Antimicrobial Peptides. Int J Mol Sci 2022; 23:ijms23052499. [PMID: 35269641 PMCID: PMC8910669 DOI: 10.3390/ijms23052499] [Citation(s) in RCA: 45] [Impact Index Per Article: 22.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Revised: 02/20/2022] [Accepted: 02/22/2022] [Indexed: 02/06/2023] Open
Abstract
With the growing problem of the emergence of antibiotic-resistant bacteria, the search for alternative ways to combat bacterial infections is extremely urgent. While analyzing the effect of antimicrobial peptides (AMPs) on immunocompetent cells, their effect on all parts of the immune system, and on humoral and cellular immunity, is revealed. AMPs have direct effects on neutrophils, monocytes, dendritic cells, T-lymphocytes, and mast cells, participating in innate immunity. They act on B-lymphocytes indirectly, enhancing the induction of antigen-specific immunity, which ultimately leads to the activation of adaptive immunity. The adjuvant activity of AMPs in relation to bacterial and viral antigens was the reason for their inclusion in vaccines and made it possible to formulate the concept of a “defensin vaccine” as an innovative basis for constructing vaccines. The immunomodulatory function of AMPs involves their influence on cells in the nearest microenvironment, recruitment and activation of other cells, supporting the response to pathogenic microorganisms and completing the inflammatory process, thus exhibiting a systemic effect. For the successful use of AMPs in medical practice, it is necessary to study their immunomodulatory activity in detail, taking into account their pleiotropy. The degree of maturity of the immune system and microenvironment can contribute to the prevention of complications and increase the effectiveness of therapy, since AMPs can suppress inflammation in some circumstances, but aggravate the response and damage of organism in others. It should also be taken into account that the real functions of one or another AMP depend on the types of total regulatory effects on the target cell, and not only on properties of an individual peptide. A wide spectrum of biological activity, including direct effects on pathogens, inactivation of bacterial toxins and influence on immunocompetent cells, has attracted the attention of researchers, however, the cytostatic activity of AMPs against normal cells, as well as their allergenic properties and low stability to host proteases, are serious limitations for the medical use of AMPs. In this connection, the tasks of searching for compounds that selectively affect the target and development of an appropriate method of application become critically important. The scope of this review is to summarize the current concepts and newest advances in research of the immunomodulatory activity of natural and synthetic AMPs, and to examine the prospects and limitations of their medical use.
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Tian M, Liu J, Chai J, Wu J, Xu X. Antimicrobial and Anti-inflammatory Effects of a Novel Peptide From the Skin of Frog Microhyla pulchra. Front Pharmacol 2022; 12:783108. [PMID: 34975482 PMCID: PMC8718063 DOI: 10.3389/fphar.2021.783108] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2021] [Accepted: 11/15/2021] [Indexed: 12/23/2022] Open
Abstract
Brevinins are an important antimicrobial peptide (AMP) family identified in the skin of Ranidae frogs and generally contain a characteristic ranabox structure at their C-terminal sequence. Herein a novel AMP named brevinin-2MP has been identified from the skin of the frog Microhyla pulchra by molecular cloning. Brevinin-2MP (GVITDTLKGVAKTVAAELLRKAHCKLTNSC) with a high amphipathic α-helix in sodium dodecyl sulfate solutions can destroy bacterial cell membrane and kill microbes. Furthermore, brevinin-2MP has been found to inhibit the lipopolysaccharide (LPS)-induced expression of pro-inflammatory NO, MCP-1, IL-6, and TNF-α via binding unidentified targets on the cell membrane and consequently suppressing the activation of MAPK/NF-κB signaling cascades induced by LPS in RAW 264.7 cells. Consistently, brevinin-2MP significantly alleviates the acute inflammatory response in carrageenan-induced mice paw. In conclusion, brevinin-2MP with anti-inflammatory and antimicrobial properties will be an ideal candidate drug molecule for bacterial inflammation treatment.
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Affiliation(s)
- Maolin Tian
- Department of Pulmonary and Critical Care Medicine, Zhujiang Hospital, Southern Medical University, Guangzhou, China.,Guangdong Provincial Key Laboratory of New Drug Screening, School of Pharmaceutical Sciences, Southern Medical University, Guangzhou, China
| | - Junfang Liu
- Department of Pulmonary and Critical Care Medicine, Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - Jinwei Chai
- Guangdong Provincial Key Laboratory of New Drug Screening, School of Pharmaceutical Sciences, Southern Medical University, Guangzhou, China
| | - Jiena Wu
- Guangdong Provincial Key Laboratory of New Drug Screening, School of Pharmaceutical Sciences, Southern Medical University, Guangzhou, China
| | - Xueqing Xu
- Guangdong Provincial Key Laboratory of New Drug Screening, School of Pharmaceutical Sciences, Southern Medical University, Guangzhou, China
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7
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Yin CM, Pan XY, Cao XT, Li T, Zhang YH, Lan JF. A crayfish ALF inhibits the proliferation of microbiota by binding to RPS4 and MscL of E. coli. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2021; 121:104106. [PMID: 33878364 DOI: 10.1016/j.dci.2021.104106] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Revised: 04/11/2021] [Accepted: 04/14/2021] [Indexed: 06/12/2023]
Abstract
Antimicrobial peptides (AMPs), most of which are small proteins, are necessary for innate immunity against pathogens. Anti-lipopolysaccharide factor (ALF) with a conserved lipopolysaccharide binding domain (LBD) can bind to lipopolysaccharide (LPS) and neutralize LPS activity. The antibacterial mechanism of ALF, especially its role in bacteria, needs to be further investigated. In this study, the antibacterial role of an anti-lipopolysaccharide factor (PcALF5) derived from Procambarus clarkii was analyzed. PcALF5 could inhibit the replication of the microbiota in vitro and enhance the bacterial clearance ability in crayfish in vivo. Far-western blot assay results indicated that PcALF5 bound to two proteins of E. coli (approximately 25 kDa and 15 kDa). Mass spectrometry (MS), far-western blot assay, and pull-down results showed that 30S ribosomal protein S4 (RPS4, 25 kD) interacted with PcALF5. Further studies revealed that another E. coli protein binding to PcALF5 could be the large mechanosensitive channel (MscL), which is reported to participate in the transport of peptides and antibiotics. Additional assays showed that PcALF5 inhibited protein synthesis and promoted the transcription of ribosomal component genes in E. coli. Overall, these results indicate that PcALF5 could transfer into E. coli by binding to MscL and inhibit protein synthesis by interacting with RPS4. This study reveals the mechanism underlying ALF involvement in the antibacterial immune response and provides a new reference for the research on antibacterial drugs.
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Affiliation(s)
- Cheng-Ming Yin
- College of Fisheries, Huazhong Agricultural University, Wuhan, 430070, China
| | - Xiao-Yi Pan
- Agriculture Ministry Key Laboratory of Healthy Freshwater Aquaculture, Key Laboratory of Freshwater Aquaculture Genetic and Breeding of Zhejiang Province, Zhejiang Institute of Freshwater Fisheries, Huzhou, 313001, China
| | - Xiao-Tong Cao
- Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, College of Animal Science and Veterinary Medicine, Shandong Agricultural University, Taian, 271018, China
| | - Tong Li
- College of Fisheries, Huazhong Agricultural University, Wuhan, 430070, China
| | - Ying-Hao Zhang
- College of Fisheries, Huazhong Agricultural University, Wuhan, 430070, China.
| | - Jiang-Feng Lan
- College of Fisheries, Huazhong Agricultural University, Wuhan, 430070, China; Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, College of Animal Science and Veterinary Medicine, Shandong Agricultural University, Taian, 271018, China.
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Elias R, Duarte A, Perdigão J. A Molecular Perspective on Colistin and Klebsiella pneumoniae: Mode of Action, Resistance Genetics, and Phenotypic Susceptibility. Diagnostics (Basel) 2021; 11:1165. [PMID: 34202395 PMCID: PMC8305994 DOI: 10.3390/diagnostics11071165] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Revised: 06/11/2021] [Accepted: 06/16/2021] [Indexed: 12/26/2022] Open
Abstract
Klebsiella pneumoniae is a rod-shaped, encapsulated, Gram-negative bacteria associated with multiple nosocomial infections. Multidrug-resistant (MDR) K. pneumoniae strains have been increasing and the therapeutic options are increasingly limited. Colistin is a long-used, polycationic, heptapeptide that has regained attention due to its activity against Gram-negative bacteria, including the MDR K. pneumoniae strains. However, this antibiotic has a complex mode of action that is still under research along with numerous side-effects. The acquisition of colistin resistance is mainly associated with alteration of lipid A net charge through the addition of cationic groups synthesized by the gene products of a multi-genic regulatory network. Besides mutations in these chromosomal genes, colistin resistance can also be achieved through the acquisition of plasmid-encoded genes. Nevertheless, the diversity of molecular markers for colistin resistance along with some adverse colistin properties compromises the reliability of colistin-resistance monitorization methods. The present review is focused on the colistin action and molecular resistance mechanisms, along with specific limitations on drug susceptibility testing for K. pneumoniae.
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Affiliation(s)
- Rita Elias
- Research Institute for Medicines (iMed.ULisboa), Faculdade de Farmácia, Universidade de Lisboa, 1649-003 Lisboa, Portugal
| | - Aida Duarte
- Faculdade de Farmácia, Universidade de Lisboa, 1649-003 Lisboa, Portugal
- Centro de Investigação Interdisciplinar Egas Moniz, Instituto Universitário Egas Moniz, Monte da Caparica, 2829-511 Almada, Portugal
| | - João Perdigão
- Research Institute for Medicines (iMed.ULisboa), Faculdade de Farmácia, Universidade de Lisboa, 1649-003 Lisboa, Portugal
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Zarghami Dehaghani M, Yousefi F, Bagheri B, Seidi F, Hamed Mashhadzadeh A, Rabiee N, Zarrintaj P, Mostafavi E, Saeb MR, Kim YC. α-Helical Antimicrobial Peptide Encapsulation and Release from Boron Nitride Nanotubes: A Computational Study. Int J Nanomedicine 2021; 16:4277-4288. [PMID: 34194228 PMCID: PMC8238539 DOI: 10.2147/ijn.s313855] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2021] [Accepted: 05/28/2021] [Indexed: 12/16/2022] Open
Abstract
Introduction Antimicrobial peptides are potential therapeutics as anti-bacteria, anti-viruses, anti-fungi, or anticancers. However, they suffer from a short half-life and drug resistance which limit their long-term clinical usage. Methods Herein, we captured the encapsulation of antimicrobial peptide HA-FD-13 into boron nitride nanotube (BNNT) (20,20) and its release due to subsequent insertion of BNNT (14,14) with molecular dynamics simulation. Results The peptide-BNNT (20,20) van der Waals (vdW) interaction energy decreased to −270 kcal·mol−1 at the end of the simulation (15 ns). However, during the period of 0.2–1.8 ns, when half of the peptide was inside the nanotube, the encapsulation was paused due to an energy barrier in the vicinity of BNNT and subsequently the external intervention, such that the self-adjustment of the peptide allowed full insertion. The free energy of the encapsulation process was −200.12 kcal·mol−1, suggesting that the insertion procedure occurred spontaneously. Discussion Once the BNNT (14,14) entered into the BNNT (20,20), the peptide was completely released after 83.8 ps. This revealed that the vdW interaction between the BNNT (14,14) and BNNT (20,20) was stronger than between BNNT (20,20) and the peptide; therefore, the BNNT (14,14) could act as a piston pushing the peptide outside the BNNT (20,20). Moreover, the sudden drop in the vdW energy between nanotubes to the value of the −1300 Kcal·mol−1 confirmed the self-insertion of the BNNT (14,14) into the BNNT (20,20) and correspondingly the release of the peptide.
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Affiliation(s)
- Maryam Zarghami Dehaghani
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources and Joint International Research Lab of Lignocellulosic Functional Materials, Nanjing Forestry University, Nanjing, 210037, People's Republic of China
| | - Farrokh Yousefi
- Department of Physics, University of Zanjan, Zanjan, 45195-313, Iran
| | - Babak Bagheri
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 305-701, Republic of Korea
| | - Farzad Seidi
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources and Joint International Research Lab of Lignocellulosic Functional Materials, Nanjing Forestry University, Nanjing, 210037, People's Republic of China
| | - Amin Hamed Mashhadzadeh
- Center of Excellence in Electrochemistry, School of Chemistry, College of Science, University of Tehran, Tehran, Iran
| | - Navid Rabiee
- Department of Chemistry, Sharif University of Technology, Tehran, 11155-3516, Iran
| | - Payam Zarrintaj
- School of Chemical Engineering, Oklahoma State University, Stillwater, OK, 74078, USA
| | - Ebrahim Mostafavi
- Stanford Cardiovascular Institute, Stanford University School of Medicine, Stanford, CA, USA.,Department of Medicine, Stanford University School of Medicine, Stanford, CA, USA
| | - Mohammad Reza Saeb
- Center of Excellence in Electrochemistry, School of Chemistry, College of Science, University of Tehran, Tehran, Iran
| | - Yeu-Chun Kim
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 305-701, Republic of Korea
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An in vitro study on factors affecting endotoxin neutralization in human plasma using the Limulus amebocyte lysate test. Sci Rep 2021; 11:4192. [PMID: 33603020 PMCID: PMC7893160 DOI: 10.1038/s41598-021-83487-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Accepted: 01/21/2021] [Indexed: 01/14/2023] Open
Abstract
Endotoxin neutralization, caused by plasma components, makes it difficult to detect endotoxins in human blood. In this study, we investigated which factors influence the recovery of endotoxins using limulus ameobocyte lysate (LAL)-based assays. The individual factors that were examined in more detail were lipoprotein content, type of blood anticoagulation, kinetics and serum levels of divalent cations. Furthermore, it was investigated whether there is a direct correlation between LAL activity and monocyte activation. We could show that polyanionic heparin increases endotoxin recovery in blood, while citrate anticoagulation promotes endotoxin neutralization. Furthermore, we could show that the endotoxin activity in human plasma and serum decreases strongly over time. Time-dependent endotoxin neutralization reaches its maximum after 4–6 h incubation. By means of filtration tests we could determine that endotoxins in the plasma bind to lipoproteins but do not influence their activity. Comparative measurements have shown that high LAL activity of endotoxins in plasma simultaneously possesses high monocyte activating properties in whole blood. For the maximum recovery of endotoxins in human blood the physiological calcium and magnesium concentrations are sufficient. In this study, it was shown that the endotoxin neutralizing plasma components have a molecular weight similar to β2-microglobulin (11.7 kDa). For the exact identification of the endotoxin neutralizing plasma components, which caused a modulation of the immunostimulating endotoxin activity, further investigations have to be carried out in the future.
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11
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Alford MA, Baquir B, Santana FL, Haney EF, Hancock REW. Cathelicidin Host Defense Peptides and Inflammatory Signaling: Striking a Balance. Front Microbiol 2020; 11:1902. [PMID: 32982998 PMCID: PMC7481365 DOI: 10.3389/fmicb.2020.01902] [Citation(s) in RCA: 48] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Accepted: 07/20/2020] [Indexed: 12/28/2022] Open
Abstract
Host-defense peptides (HDPs) are vital components of innate immunity in all vertebrates. While their antibacterial activity toward bacterial cells was the original focus for research, their ability to modulate immune and inflammatory processes has emerged as one of their major functions in the host and as a promising approach from which to develop novel therapeutics targeting inflammation and innate immunity. In this review, with particular emphasis on the cathelicidin family of peptides, the roles of natural HDPs are examined in managing immune activation, cellular recruitment, cytokine responses, and inflammation in response to infection, as well as their contribution(s) to various inflammatory disorders and autoimmune diseases. Furthermore, we discuss current efforts to develop synthetic HDPs as therapeutics aimed at restoring balance to immune responses that are dysregulated and contribute to disease pathologies.
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Affiliation(s)
- Morgan A. Alford
- Centre for Microbial Diseases and Immunity Research, University of British Columbia, Vancouver, BC, Canada
| | - Beverlie Baquir
- Centre for Microbial Diseases and Immunity Research, University of British Columbia, Vancouver, BC, Canada
| | - Felix L. Santana
- Centre for Microbial Diseases and Immunity Research, University of British Columbia, Vancouver, BC, Canada
- Departamento de Medicina Molecular y Bioprocesos, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Cuernavaca, Mexico
| | - Evan F. Haney
- Centre for Microbial Diseases and Immunity Research, University of British Columbia, Vancouver, BC, Canada
| | - Robert E. W. Hancock
- Centre for Microbial Diseases and Immunity Research, University of British Columbia, Vancouver, BC, Canada
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12
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Sharma A, Nigam R, Kumar A, Singh S. Mass Spectrometry-Based Identification of Urinary Antimicrobial Peptides in Dairy Cows. Protein Pept Lett 2020; 27:225-235. [PMID: 31654508 DOI: 10.2174/0929866526666191025105038] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2019] [Revised: 07/10/2019] [Accepted: 08/09/2019] [Indexed: 11/22/2022]
Abstract
BACKGROUND Urine is considered one of the biological fluids in which antimicrobial peptides are secreted or expressed. Cow urine has not been investigated for the presence of these peptides using MALDI-TOF-MS. OBJECTIVE The aim of this study is to isolate, identify and assess the antimicrobial activity of urinary antimicrobial peptides from healthy normal cycling cows. METHODS We analyzed the urine sample using diafiltration, ion exchange chromatography, Reverse Phase High-Performance Liquid Chromatography (RP-HPLC), acid urea polyacrylamide gel electrophoresis (AU-PAGE) coupled with identification through Peptide Mass Fingerprinting (PMF) by matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDITOF- MS). The in vitro antimicrobial effects of purified fractions were assessed using Radial Diffusion Assay (RDA) and microtitre broth dilution assay against Gram-positive and Gramnegative bacteria. RESULTS Proteins corresponding to the peaks were identified using SWISSPROT protein database. This study revealed constitutive expression of β-Defensin-1 (DEFB1), β-Defensin-4A (DFB4A), Neutrophil Defensin-1 (DEF1), Neutrophil Defensin-3 (DEF3) in cow urine. The identified peptides are cationic antimicrobial peptides of the defensin family. The purified fractions exhibited antimicrobial effects in radial diffusion assay and MIC values in the range of 2.93-29.3 µM/L. CONCLUSION This study concludes that cow urine, previously unexplored with regard to antimicrobial peptides, would be a promising source of highly potent AMPs and an effective alternative to the resistant antibiotics.
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Affiliation(s)
- Ambika Sharma
- Department of Veterinary Biochemistry, College of Veterinary Science & Animal Husbandry, DUVASU, Mathura-281 001, Uttar Pradesh, India
| | - Rajesh Nigam
- Department of Veterinary Biochemistry, College of Veterinary Science & Animal Husbandry, DUVASU, Mathura-281 001, Uttar Pradesh, India
| | - Ashish Kumar
- Department of Biochemistry, All India Institute of Medical Sciences (AIIMS), Rishikesh, Uttarakhand-249 203, India
| | - Simmi Singh
- College of Biotechnology, DUVASU, Mathura-281 001, Uttar Pradesh, India
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13
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Ahmad B, Li Z, Hanif Q, Hu Q, Wei X, Zhang L, Khan SA, Aihemaiti M, Gulzar H, Shahid M, Si D, Zhang R. A Hybrid Peptide DEFB-TP5 Expressed in Methylotrophic Yeast Neutralizes LPS With Potent Anti-inflammatory Activities. Front Pharmacol 2020; 11:461. [PMID: 32457599 PMCID: PMC7221121 DOI: 10.3389/fphar.2020.00461] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2019] [Accepted: 03/24/2020] [Indexed: 12/31/2022] Open
Abstract
DEFB-TP5 is a novel auspicious health-beneficial peptide derivative from two naturally occurring peptides, β-Defensin (DEFB) and thymopentin (TP5), and shows strong anti-inflammatory activity and binds to LPS without cytotoxicity and hemolytic effect. Furthermore, the application of DEFB-TP5 peptide is inadequate by its high cost. In the current study, we developed a biocompatible mechanism for expression of the DEFB-TP5 peptide in Pichia pastoris. The transgenic strain of hybrid DEFB-TP5 peptide with a molecular weight of 6.7kDa as predictable was obtained. The recombinant DEFB-TP5 peptide was purified by Ni-NTA chromatography, estimated 30.41 mg/L was obtained from the cell culture medium with 98.2% purity. Additionally, The purified DEFB-TP5 peptide significantly (p< 0.05) diminished the release of nitric oxide (NO), TNF-α, IL-6, IL-1β in LPS-stimulated RAW264.7 macrophages in a dose-dependent manner. This study will not only help to understand the molecular mechanism of expression that can potentially be used to develop an anti-endotoxin peptide but also to serve as the basis for the development of antimicrobial and anti-inflammatory agents as well, which also provides a potential source for the production of recombinant bioactive DEFB-TP5 at the industrial level.
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Affiliation(s)
- Baseer Ahmad
- State Key Laboratory of Animal Nutrition and Feed Sciences, Laboratory of Feed Biotechnology, College of Animal Science and Technology, China Agricultural University, Beijing, China
| | - Zhongxuan Li
- State Key Laboratory of Animal Nutrition and Feed Sciences, Laboratory of Feed Biotechnology, College of Animal Science and Technology, China Agricultural University, Beijing, China
| | - Quratulain Hanif
- Computational Biology Laboratory, Agricultural Biotechnology Division, National Institute for Biotechnology and Genetic Engineering, Faisalabad, Pakistan.,Department of Biotechnology, Pakistan Institute of Engineering and Applied Sciences, Nilore, Islamabad, Pakistan
| | - Qingyong Hu
- State Key Laboratory of Animal Nutrition and Feed Sciences, Laboratory of Feed Biotechnology, College of Animal Science and Technology, China Agricultural University, Beijing, China
| | - Xubiao Wei
- State Key Laboratory of Animal Nutrition and Feed Sciences, Laboratory of Feed Biotechnology, College of Animal Science and Technology, China Agricultural University, Beijing, China.,College of Life Sciences, Peking University, Beijing, China
| | - Lulu Zhang
- State Key Laboratory of Animal Nutrition and Feed Sciences, Laboratory of Feed Biotechnology, College of Animal Science and Technology, China Agricultural University, Beijing, China
| | - Shahzad Akbar Khan
- Guangzhou Institute of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou, China
| | - Maierhaba Aihemaiti
- State Key Laboratory of Animal Nutrition and Feed Sciences, Laboratory of Feed Biotechnology, College of Animal Science and Technology, China Agricultural University, Beijing, China
| | - Huma Gulzar
- College of Life Sciences, China Agricultural University, Beijing, China
| | - Muhammad Shahid
- State Key Laboratory of Animal Nutrition and Feed Sciences, Laboratory of Feed Biotechnology, College of Animal Science and Technology, China Agricultural University, Beijing, China
| | - Dayong Si
- State Key Laboratory of Animal Nutrition and Feed Sciences, Laboratory of Feed Biotechnology, College of Animal Science and Technology, China Agricultural University, Beijing, China
| | - Rijun Zhang
- State Key Laboratory of Animal Nutrition and Feed Sciences, Laboratory of Feed Biotechnology, College of Animal Science and Technology, China Agricultural University, Beijing, China
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Peek NFAW, Nell MJ, Brand R, Jansen-Werkhoven T, van Hoogdalem EJ, Verrijk R, Vonk MJ, Wafelman AR, Valentijn ARPM, Frijns JHM, Hiemstra PS, Drijfhout JW, Nibbering PH, Grote JJ. Ototopical drops containing a novel antibacterial synthetic peptide: Safety and efficacy in adults with chronic suppurative otitis media. PLoS One 2020; 15:e0231573. [PMID: 32287316 PMCID: PMC7156094 DOI: 10.1371/journal.pone.0231573] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2018] [Accepted: 03/25/2020] [Indexed: 11/18/2022] Open
Abstract
OBJECTIVE Chronic suppurative otitis media (CSOM) is a chronic infectious disease with worldwide prevalence that causes hearing loss and decreased quality of life. As current (antibiotic) treatments often unsuccessful and antibiotic resistance is emerging, alternative agents and/or strategies are urgently needed. We considered the synthetic antimicrobial and anti-biofilm peptide P60.4Ac to be an interesting candidate because it also displays anti-inflammatory activities including lipopolysaccharide-neutralizing activity. The aim of the present study was to investigate the safety and efficacy of ototopical drops containing P60.4Ac in adults with CSOM without cholesteatoma. METHODS We conducted a range-finding study in 16 subjects followed by a randomized, double blinded, placebo-controlled, multicentre phase IIa study in 34 subjects. P60.4Ac-containing ototopical drops or placebo drops were applied twice a day for 2 weeks and adverse events (AEs) and medication use were recorded. Laboratory tests, swabs from the middle ear and throat for bacterial cultures, and audiometry were performed at intervals up to 10 weeks after therapy. Response to treatment was assessed by blinded symptom scoring on otoscopy. RESULTS Application of P60.4Ac-containing ototopical drops (0.25-2.0 mg of peptide/ml) in the ear canal of patients suffering from CSOM was found to be safe and well-tolerated. The optimal dose (0.5 mg of peptide/ml) was selected for the subsequent phase IIa study. Safety evaluation revealed only a few AEs that were unlikely related to study treatment and all, except one, were of mild to moderate intensity. In addition to this excellent safety profile, P60.4Ac ototopical drops resulted in a treatment success in 47% of cases versus 6% in the placebo group. CONCLUSION The efficacy/safety balance assessed in the present study provides a compelling justification for continued clinical development of P60.4Ac in therapy-resistant CSOM.
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Affiliation(s)
- Nanno F. A. W. Peek
- Department of Ear Nose and Throat, Leiden University Medical Centre (LUMC), Leiden, The Netherlands
| | - Marja J. Nell
- Octoplus Technologies BV/Dr Reddy’s research and development BV, Leiden, The Netherlands
| | - Ronald Brand
- Department of Biomedical Data Sciences, Leiden University Medical Centre, Leiden, The Netherlands
| | - Thekla Jansen-Werkhoven
- Department of Biomedical Data Sciences, Leiden University Medical Centre, Leiden, The Netherlands
| | - Ewoud J. van Hoogdalem
- Octoplus Technologies BV/Dr Reddy’s research and development BV, Leiden, The Netherlands
| | - Ruud Verrijk
- Octoplus Technologies BV/Dr Reddy’s research and development BV, Leiden, The Netherlands
| | - Marcel J. Vonk
- Department of Pulmonology, Leiden University Medical Centre, Leiden, The Netherlands
| | - Amon R. Wafelman
- Clinical Pharmacology and Toxicology, Leiden University Medical Centre, Leiden, The Netherlands
| | - A. Rob P. M. Valentijn
- Clinical Pharmacology and Toxicology, Leiden University Medical Centre, Leiden, The Netherlands
| | - Johan H. M. Frijns
- Department of Ear Nose and Throat, Leiden University Medical Centre (LUMC), Leiden, The Netherlands
| | - Pieter S. Hiemstra
- Department of Pulmonology, Leiden University Medical Centre, Leiden, The Netherlands
| | - Jan W. Drijfhout
- Immunohematology and Blood Transfusion, Leiden University Medical Centre, Leiden, The Netherlands
| | - Peter H. Nibbering
- Department of Infectious Diseases, Leiden University Medical Centre, Leiden, The Netherlands
| | - Jan J. Grote
- Department of Ear Nose and Throat, Leiden University Medical Centre (LUMC), Leiden, The Netherlands
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Basauri A, González-Fernández C, Fallanza M, Bringas E, Fernandez-Lopez R, Giner L, Moncalián G, de la Cruz F, Ortiz I. Biochemical interactions between LPS and LPS-binding molecules. Crit Rev Biotechnol 2020; 40:292-305. [DOI: 10.1080/07388551.2019.1709797] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Arantza Basauri
- Departamento de Ingenierías Química y Biomolecular, Universidad de Cantabria, Santander, Spain
| | | | - Marcos Fallanza
- Departamento de Ingenierías Química y Biomolecular, Universidad de Cantabria, Santander, Spain
| | - Eugenio Bringas
- Departamento de Ingenierías Química y Biomolecular, Universidad de Cantabria, Santander, Spain
| | - Raúl Fernandez-Lopez
- Instituto de Biomedicina y Biotecnologia (IBBTEC), CSIC, Universidad de Cantabria, Santander, Spain
| | - Laura Giner
- Instituto de Biomedicina y Biotecnologia (IBBTEC), CSIC, Universidad de Cantabria, Santander, Spain
| | - Gabriel Moncalián
- Instituto de Biomedicina y Biotecnologia (IBBTEC), CSIC, Universidad de Cantabria, Santander, Spain
| | - Fernando de la Cruz
- Instituto de Biomedicina y Biotecnologia (IBBTEC), CSIC, Universidad de Cantabria, Santander, Spain
| | - Inmaculada Ortiz
- Departamento de Ingenierías Química y Biomolecular, Universidad de Cantabria, Santander, Spain
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17
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Unveiling the Multifaceted Mechanisms of Antibacterial Activity of Buforin II and Frenatin 2.3S Peptides from Skin Micro-Organs of the Orinoco Lime Treefrog ( Sphaenorhynchus lacteus). Int J Mol Sci 2018; 19:ijms19082170. [PMID: 30044391 PMCID: PMC6121439 DOI: 10.3390/ijms19082170] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2018] [Accepted: 07/19/2018] [Indexed: 12/15/2022] Open
Abstract
Amphibian skin is a rich source of natural compounds with diverse antimicrobial and immune defense properties. Our previous studies showed that the frog skin secretions obtained by skin micro-organs from various species of Colombian anurans have antimicrobial activities against bacteria and viruses. We purified for the first time two antimicrobial peptides from the skin micro-organs of the Orinoco lime treefrog (Sphaenorhynchus lacteus) that correspond to Buforin II (BF2) and Frenatin 2.3S (F2.3S). Here, we have synthesized the two peptides and tested them against Gram-negative and Gram-positive bacteria, observing an effective bactericidal activity at micromolar concentrations. Evaluation of BF2 and F2.3S membrane destabilization activity on bacterial cell cultures and synthetic lipid bilayers reveals a distinct membrane interaction mechanism. BF2 agglutinates E. coli cells and synthetic vesicles, whereas F2.3S shows a high depolarization and membrane destabilization activities. Interestingly, we found that F2.3S is able to internalize within bacterial cells and can bind nucleic acids, as previously reported for BF2. Moreover, bacterial exposure to both peptides alters the expression profile of genes related to stress and resistance response. Overall, these results show the multifaceted mechanism of action of both antimicrobial peptides that can provide alternative tools in the fight against bacterial resistance.
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18
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Hajimohammadi A, Badiei K, Kheibari P, Pourjafar M, Chalmeh A. Effects of Polymyxin B on Clinical Signs, Serum TNF-α, Haptoglobin and Plasma Lactate Concentrations in Experimental Endotoxaemia in Sheep. J Vet Res 2018; 62:79-85. [PMID: 29978131 PMCID: PMC5957465 DOI: 10.1515/jvetres-2018-0011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2017] [Accepted: 02/16/2018] [Indexed: 11/15/2022] Open
Abstract
Introduction The experiment evaluated the effects of intravenous administration of polymyxin B on experimental endotoxaemia in sheep. Material and Methods Twenty clinically healthy fat-tailed sheep were randomly divided into: a group treated with 6,000 U/kg of polymyxin B, a group at 12,000 U/kg, and positive and negative controls. Endotoxaemia was induced by intravenous administration of lipopolysaccharide (LPS) from E. coli serotype O55:B5 at 0.5 μg/kg. polymyxin was infused intravenously along with 2.5 L of isotonic intravenous fluids at 20 mL/kg/h. The positive control group received LPS and 2.5 L of isotonic fluids, the negatives receiving just 2.5 L of isotonic fluids. Clinical signs were evaluated before and at 1.5, 3, 4.5, 6, 24, and 48 h after LPS administration. Blood was also sampled at the denoted hours and serum haptoglobin, tumour necrosis factor-α (TNF-α), and plasma lactate concentrations were assayed. Results The serum concentration of TNF-α in the positive control group increased significantly up to 48 h after LPS administration. The concentration of TNF-α was significantly different from those of the polymyxin B and positive control groups from 3 to 48 h; also, the concentrations of haptoglobin at different times in the polymyxin groups were lower than those of the positive control group and were significant at hours 3 to 48 (P < 0.05). Following the LPS administration, haptoglobin and TNF-α concentrations changed without significant difference between the two polymyxin B groups. Conclusion Polymyxin B (6,000 U/kg) restrained blood lactate concentrations. Furthermore, it significantly improved the clinical signs in endotoxaemic animals, including rectal temperature and heart and respiratory rates. Polymyxin B may be an antiendotoxic in fat-tailed sheep.
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Affiliation(s)
- Ali Hajimohammadi
- Department of Clinical Sciences, School of Veterinary Medicine, Shiraz University, Shiraz, 71345-1731, Iran
| | - Khalil Badiei
- Department of Clinical Sciences, School of Veterinary Medicine, Shiraz University, Shiraz, 71345-1731, Iran
| | - Parviz Kheibari
- Department of Clinical Sciences, School of Veterinary Medicine, Shiraz University, Shiraz, 71345-1731, Iran
| | - Meherdad Pourjafar
- Department of Clinical Sciences, School of Veterinary Medicine, Shiraz University, Shiraz, 71345-1731, Iran
| | - Aliasghar Chalmeh
- Department of Clinical Sciences, School of Veterinary Medicine, Shiraz University, Shiraz, 71345-1731, Iran
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19
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Effects of polymyxin B on clinical signs, serum TNF-α, haptoglobin and plasma lactate concentrations in experimental endotoxaemia in sheep. J Vet Res 2018. [DOI: 10.2478/jvetres-2018-0011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Abstract
Introduction
The experiment evaluated the effects of intravenous administration of polymyxin B on experimental endotoxaemia in sheep.
Material and Methods
Twenty clinically healthy fat-tailed sheep were randomly divided into: a group treated with 6,000 U/kg of polymyxin B, a group at 12,000 U/kg, and positive and negative controls. Endotoxaemia was induced by intravenous administration of lipopolysaccharide (LPS) from E. coli serotype O55:B5 at 0.5 μg/kg. polymyxin was infused intravenously along with 2.5 L of isotonic intravenous fluids at 20 mL/kg/h. The positive control group received LPS and 2.5 L of isotonic fluids, the negatives receiving just 2.5 L of isotonic fluids. Clinical signs were evaluated before and at 1.5, 3, 4.5, 6, 24, and 48 h after LPS administration. Blood was also sampled at the denoted hours and serum haptoglobin, tumour necrosis factor-α (TNF-α), and plasma lactate concentrations were assayed.
Results
The serum concentration of TNF-α in the positive control group increased significantly up to 48 h after LPS administration. The concentration of TNF-α was significantly different from those of the polymyxin B and positive control groups from 3 to 48 h; also, the concentrations of haptoglobin at different times in the polymyxin groups were lower than those of the positive control group and were significant at hours 3 to 48 (P < 0.05). Following the LPS administration, haptoglobin and TNF-α concentrations changed without significant difference between the two polymyxin B groups.
Conclusion
Polymyxin B (6,000 U/kg) restrained blood lactate concentrations. Furthermore, it significantly improved the clinical signs in endotoxaemic animals, including rectal temperature and heart and respiratory rates. Polymyxin B may be an antiendotoxic in fat-tailed sheep.
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Enhanced capture of bacteria and endotoxin by antimicrobial WLBU2 peptide tethered on polyethylene oxide spacers. Biointerphases 2017; 12:05G603. [DOI: 10.1116/1.4997049] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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21
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Oyama LB, Girdwood SE, Cookson AR, Fernandez-Fuentes N, Privé F, Vallin HE, Wilkinson TJ, Golyshin PN, Golyshina OV, Mikut R, Hilpert K, Richards J, Wootton M, Edwards JE, Maresca M, Perrier J, Lundy FT, Luo Y, Zhou M, Hess M, Mantovani HC, Creevey CJ, Huws SA. The rumen microbiome: an underexplored resource for novel antimicrobial discovery. NPJ Biofilms Microbiomes 2017; 3:33. [PMID: 29214045 PMCID: PMC5711939 DOI: 10.1038/s41522-017-0042-1] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2017] [Revised: 10/04/2017] [Accepted: 11/06/2017] [Indexed: 12/27/2022] Open
Abstract
Antimicrobial peptides (AMPs) are promising drug candidates to target multi-drug resistant bacteria. The rumen microbiome presents an underexplored resource for the discovery of novel microbial enzymes and metabolites, including AMPs. Using functional screening and computational approaches, we identified 181 potentially novel AMPs from a rumen bacterial metagenome. Here, we show that three of the selected AMPs (Lynronne-1, Lynronne-2 and Lynronne-3) were effective against numerous bacterial pathogens, including methicillin-resistant Staphylococcus aureus (MRSA). No decrease in MRSA susceptibility was observed after 25 days of sub-lethal exposure to these AMPs. The AMPs bound preferentially to bacterial membrane lipids and induced membrane permeability leading to cytoplasmic leakage. Topical administration of Lynronne-1 (10% w/v) to a mouse model of MRSA wound infection elicited a significant reduction in bacterial counts, which was comparable to treatment with 2% mupirocin ointment. Our findings indicate that the rumen microbiome may provide viable alternative antimicrobials for future therapeutic application. Anti-microbial molecules made by microbes in the gut of ruminant animals could become new weapons against antibiotic-resistant infections. An international team of researchers led by Sharon Huws at Queen’s University Belfast, UK, identified three anti-microbial peptides in the rumen of animals such as cattle, sheep and goats. The peptides—short proteins—were highly active in laboratory trials against several clinically important drug-resistant infections. These included methicillin resistant Staphylococcus aureus (MRSA), a notorious cause of life-threatening infections, especially in patients with weakened immunity. There is growing interest in using peptides as alternatives to existing antibiotics. The findings, initiated by examining a ‘library’ of molecular data, suggest that the rumen is an under-explored resource that may harbor many medically useful antimicrobials. The possibilities should be investigated further, with promising molecules being tested in clinical conditions.
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Affiliation(s)
- Linda B Oyama
- Institute of Biological Environmental and Rural Sciences, Aberystwyth University, Aberystwyth, Wales, SY23 3DA UK
| | - Susan E Girdwood
- Institute of Biological Environmental and Rural Sciences, Aberystwyth University, Aberystwyth, Wales, SY23 3DA UK
| | - Alan R Cookson
- Institute of Biological Environmental and Rural Sciences, Aberystwyth University, Aberystwyth, Wales, SY23 3DA UK
| | - Narcis Fernandez-Fuentes
- Institute of Biological Environmental and Rural Sciences, Aberystwyth University, Aberystwyth, Wales, SY23 3DA UK
| | - Florence Privé
- Institute of Biological Environmental and Rural Sciences, Aberystwyth University, Aberystwyth, Wales, SY23 3DA UK
| | - Hannah E Vallin
- Institute of Biological Environmental and Rural Sciences, Aberystwyth University, Aberystwyth, Wales, SY23 3DA UK
| | - Toby J Wilkinson
- Institute of Biological Environmental and Rural Sciences, Aberystwyth University, Aberystwyth, Wales, SY23 3DA UK
| | | | | | - Ralf Mikut
- Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein, Leopoldshafen, Germany
| | - Kai Hilpert
- Institute of Infection and Immunity, St. George's University of London, Cranmer Terrace, London, SW17 0RE UK
| | - Jennifer Richards
- Specialist Antimicrobial Chemotherapy Unit, Public Health Wales, University Hospital of Wales, Heath Park, Cardiff, CF14 4XW UK
| | - Mandy Wootton
- Specialist Antimicrobial Chemotherapy Unit, Public Health Wales, University Hospital of Wales, Heath Park, Cardiff, CF14 4XW UK
| | - Joan E Edwards
- Wageningen University & Research, 6708 WE, Wageningen, Netherlands
| | - Marc Maresca
- Aix Marseille Université, CNRS, Central Marseille, iSm2, Marseille, France
| | - Josette Perrier
- Aix Marseille Université, CNRS, Central Marseille, iSm2, Marseille, France
| | - Fionnuala T Lundy
- Centre for Experimental Medicine, School of Medicine, Dentistry and Biomedical Sciences, Queen's University Belfast, Belfast, Northern Ireland, BT9 7BL UK
| | - Yu Luo
- Centre for Experimental Medicine, School of Medicine, Dentistry and Biomedical Sciences, Queen's University Belfast, Belfast, Northern Ireland, BT9 7BL UK
| | - Mei Zhou
- School of Pharmacy, Queens's University Belfast, Belfast, BT9 7BL, Northern Ireland, UK
| | - Matthias Hess
- UC Davis, College of Agricultural and Environmental Sciences, California, 95616 USA
| | - Hilario C Mantovani
- Department of Microbiology, Universidade Federal de Viçosa, Viçosa, 36570-900 Brazil
| | - Christopher J Creevey
- Institute of Biological Environmental and Rural Sciences, Aberystwyth University, Aberystwyth, Wales, SY23 3DA UK
| | - Sharon A Huws
- Institute for Global Food Security, School of Biological Sciences, Medical Biology Centre, Queen's University Belfast, 97 Lisburn Road, Belfast, Northern Ireland, BT9 7BL UK
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Genomewide Analysis of the Antimicrobial Peptides in Python bivittatus and Characterization of Cathelicidins with Potent Antimicrobial Activity and Low Cytotoxicity. Antimicrob Agents Chemother 2017. [PMID: 28630199 DOI: 10.1128/aac.00530-17] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
In this study, we sought to identify novel antimicrobial peptides (AMPs) in Python bivittatus through bioinformatic analyses of publicly available genome information and experimental validation. In our analysis of the python genome, we identified 29 AMP-related candidate sequences. Of these, we selected five cathelicidin-like sequences and subjected them to further in silico analyses. The results showed that these sequences likely have antimicrobial activity. The sequences were named Pb-CATH1 to Pb-CATH5 according to their sequence similarity to previously reported snake cathelicidins. We predicted their molecular structure and then chemically synthesized the mature peptide for three putative cathelicidins and subjected them to biological activity tests. Interestingly, all three peptides showed potent antimicrobial effects against Gram-negative bacteria but very weak activity against Gram-positive bacteria. Remarkably, ΔPb-CATH4 showed potent activity against antibiotic-resistant clinical isolates and also was observed to possess very low hemolytic activity and cytotoxicity. ΔPb-CATH4 also showed considerable serum stability. Electron microscopic analysis indicated that ΔPb-CATH4 exerts its effects via toroidal pore preformation. Structural comparison of the cathelicidins identified in this study to previously reported ones revealed that these Pb-CATHs are representatives of a new group of reptilian cathelicidins lacking the acidic connecting domain. Furthermore, Pb-CATH4 possesses a completely different mature peptide sequence from those of previously described reptilian cathelicidins. These new AMPs may be candidates for the development of alternatives to or complements of antibiotics to control multidrug-resistant pathogens.
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Characterization of a Gloverin-Like Antimicrobial Peptide Isolated from Muga Silkworm, Antheraea assamensis. Int J Pept Res Ther 2017. [DOI: 10.1007/s10989-017-9618-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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Grégoire N, Aranzana-Climent V, Magréault S, Marchand S, Couet W. Clinical Pharmacokinetics and Pharmacodynamics of Colistin. Clin Pharmacokinet 2017; 56:1441-1460. [DOI: 10.1007/s40262-017-0561-1] [Citation(s) in RCA: 89] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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25
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Swain SS, Paidesetty SK, Padhy RN. Antibacterial, antifungal and antimycobacterial compounds from cyanobacteria. Biomed Pharmacother 2017; 90:760-776. [PMID: 28419973 DOI: 10.1016/j.biopha.2017.04.030] [Citation(s) in RCA: 73] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2016] [Revised: 04/02/2017] [Accepted: 04/10/2017] [Indexed: 11/18/2022] Open
Abstract
Infections from multidrug resistant (MDR) pathogenic bacteria, fungi and Mycobacterium tuberculosis remain progressively intractable. The search of effective antimicrobials from other possible non-conventional sources against MDR pathogenic bacteria, fungi and mycobacteria is call of the day. This review considers 121 cyanobacterial compounds or cyano-compounds with antimicrobial activities. Chemical structures of cyano-compounds were retrieved from ChemSpider and PubChem databases and were visualized by the software ChemDraw Ultra. Chemical information on cyano-compounds pertaining to Lipinski rules of five was assessed. The reviewed cyano-compounds belong to the following chemical classes (with examples): alkaloids (ambiguine isonitriles and 12-epi-hapalindole E isonitrile), aromatic compounds (benzoic acid and cyanobacterin), cyclic depsipeptides (cryptophycin 52 and lyngbyabellin A), cyclic peptides (calophycin and tenuecyclamides), cyclic undecapeptides (kawaguchipeptins and lyngbyazothrin A), cyclophane (carbamidocyclophane), extracellular pigment (nostocine A), fatty acids (alpha-dimorphecolic acid and majusculonic acid), linear peptides (muscoride A), lipopeptides (fischerellins and scytonemin A), nucleosides (tolytoxin and tubercidin), phenols (ambigols and 4-4'-hydroxybiphenyl), macrolides (scytophycin A and tolytoxin), polyketides (malyngolide and nostocyclyne), polyphenyl ethers (crossbyanol A), porphinoids (tolyporphin J) and terpenoids (noscomin and scytoscalarol). Cyanobacteria appear to be a diverse source of compounds with antimicrobial activity. Further attention is required to elucidate whether those could be applied as pharmaceuticals.
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Affiliation(s)
- Shasank S Swain
- Central Research Laboratory, Institute of Medical Sciences and Sum Hospital, Siksha 'O' Anusandhan University, Kalinga Nagar, Bhubaneswar 751003, Odisha, India
| | - Sudhir K Paidesetty
- Department of Pharmaceutical Chemistry, School of Pharmaceutical Sciences, Siksha 'O' Anusandhan University, Kalinga Nagar, Bhubaneswar 751003, Odisha, India
| | - Rabindra N Padhy
- Central Research Laboratory, Institute of Medical Sciences and Sum Hospital, Siksha 'O' Anusandhan University, Kalinga Nagar, Bhubaneswar 751003, Odisha, India.
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Abstract
Antimicrobial peptides (AMPs) are expressed in various living organisms as first-line host defenses against potential harmful encounters in their surroundings. AMPs are short polycationic peptides exhibiting various antimicrobial activities. The principal antibacterial activity is attributed to the membrane-lytic mechanism which directly interferes with the integrity of the bacterial cell membrane and cell wall. In addition, a number of AMPs form a transmembrane channel in the membrane by self-aggregation or polymerization, leading to cytoplasm leakage and cell death. However, an increasing body of evidence has demonstrated that AMPs are able to exert intracellular inhibitory activities as the primary or supportive mechanisms to achieve efficient killing. In this review, we focus on the major intracellular targeting activities reported in AMPs, which include nucleic acids and protein biosynthesis and protein-folding, protease, cell division, cell wall biosynthesis, and lipopolysaccharide inhibition. These multifunctional AMPs could serve as the potential lead peptides for the future development of novel antibacterial agents with improved therapeutic profiles.
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Matzneller P, Strommer S, Drucker C, Petroczi K, Schörgenhofer C, Lackner E, Jilma B, Zeitlinger M. Colistin Reduces LPS-Triggered Inflammation in a Human Sepsis Model In Vivo: A Randomized Controlled Trial. Clin Pharmacol Ther 2017; 101:773-781. [PMID: 27864832 DOI: 10.1002/cpt.582] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2016] [Revised: 11/14/2016] [Accepted: 11/15/2016] [Indexed: 12/21/2022]
Abstract
The previously described anti-endotoxin effect of colistin has not been investigated in humans yet. We performed a randomized, double-blind, placebo-controlled crossover trial to determine the degree of colistin-driven modulation of inflammatory response in blood of lipopolysaccharide (LPS)-challenged healthy volunteers in a human endotoxemia model. After a single intravenous dose of 2.5 million IU colistin methanesulfonate, interleukin (IL)-6, IL-8, tumor necrosis factor alpha (TNF-α), and IL-1β concentrations as well as other biomarkers of inflammation such as C-reactive protein, differential leukocyte counts, and body temperature were measured up to 24 h postdose. Colistin significantly decreased the inflammatory cytokine response to LPS in blood of healthy volunteers. This effect was most evident for IL-6, IL-8, and TNF-α. This study is the first to confirm the anti-endotoxin effect of colistin in humans in vivo. Further studies might increase our knowledge on the interaction between colistin and the effectors of the immune system.
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Affiliation(s)
- P Matzneller
- Department of Clinical Pharmacology, Medical University of Vienna, Austria
| | - S Strommer
- Department of Clinical Pharmacology, Medical University of Vienna, Austria
| | - C Drucker
- Department of Clinical Pharmacology, Medical University of Vienna, Austria
| | - K Petroczi
- Department of Clinical Pharmacology, Medical University of Vienna, Austria
| | - C Schörgenhofer
- Department of Clinical Pharmacology, Medical University of Vienna, Austria
| | - E Lackner
- Department of Clinical Pharmacology, Medical University of Vienna, Austria
| | - B Jilma
- Department of Clinical Pharmacology, Medical University of Vienna, Austria
| | - M Zeitlinger
- Department of Clinical Pharmacology, Medical University of Vienna, Austria
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Samant P, Ramugade S. Successful use of intravitreal and systemic colistin in treating multidrug resistant Pseudomonas aeruginosa post-operative endophthalmitis. Indian J Ophthalmol 2016; 62:1167-70. [PMID: 25579363 PMCID: PMC4313502 DOI: 10.4103/0301-4738.126991] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
We report a case series of post-operative endophthalmitis due to Pseudomonas aeruginosa. A total of 8 patients operated for cataract, were referred to our facility with acute onset of decreased vision 1-2 days following surgery. All patients had clinical evidence of acute exogenous endophthalmitis with severe anterior chamber exudative reaction. Ocular samples (aqueous aspirate and vitreous tap) for microbiology were taken from all eyes. Microbiology from all revealed P. aeruginosa which was resistant to all antibiotics except colistin. With prompt and accurate microbiological support it was possible to control the infection in all the eyes with the use of colistin intravitreally and intravenously which to the best of our knowledge, has been never reported. Intravitreal injection of colistin could be an option effective in the management of multi-drug-resistant endophthalmitis caused by Gram-negative bacteria.
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Affiliation(s)
- Preetam Samant
- Department of Ophthalmology, P. D. Hinduja Hospital and Medical Research Center, Mumbai, Maharashtra, India
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29
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A Novel RNase 3/ECP Peptide for Pseudomonas aeruginosa Biofilm Eradication That Combines Antimicrobial, Lipopolysaccharide Binding, and Cell-Agglutinating Activities. Antimicrob Agents Chemother 2016; 60:6313-25. [PMID: 27527084 DOI: 10.1128/aac.00830-16] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2016] [Accepted: 07/22/2016] [Indexed: 12/19/2022] Open
Abstract
Eradication of established biofilm communities of pathogenic Gram-negative species is one of the pending challenges for the development of new antimicrobial agents. In particular, Pseudomonas aeruginosa is one of the main dreaded nosocomial species, with a tendency to form organized microbial communities that offer an enhanced resistance to conventional antibiotics. We describe here an engineered antimicrobial peptide (AMP) which combines bactericidal activity with a high bacterial cell agglutination and lipopolysaccharide (LPS) affinity. The RN3(5-17P22-36) peptide is a 30-mer derived from the eosinophil cationic protein (ECP), a host defense RNase secreted by eosinophils upon infection, with a wide spectrum of antipathogen activity. The protein displays high biofilm eradication activity that is not dependent on its RNase catalytic activity, as evaluated by using an active site-defective mutant. On the other hand, the peptide encompasses both the LPS-binding and aggregation-prone regions from the parental protein, which provide the appropriate structural features for the peptide's attachment to the bacterial exopolysaccharide layer and further improved removal of established biofilms. Moreover, the peptide's high cationicity and amphipathicity promote the cell membrane destabilization action. The results are also compared side by side with other reported AMPs effective against either planktonic and/or biofilm forms of Pseudomonas aeruginosa strain PAO1. The ECP and its derived peptide are unique in combining high bactericidal potency and cell agglutination activity, achieving effective biofilm eradication at a low micromolar range. We conclude that the designed RN3(5-17P22-36) peptide is a promising lead candidate against Gram-negative biofilms.
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Ahn M, Gunasekaran P, Rajasekaran G, Kim EY, Lee SJ, Bang G, Cho K, Hyun JK, Lee HJ, Jeon YH, Kim NH, Ryu EK, Shin SY, Bang JK. Pyrazole derived ultra-short antimicrobial peptidomimetics with potent anti-biofilm activity. Eur J Med Chem 2016; 125:551-564. [PMID: 27718471 DOI: 10.1016/j.ejmech.2016.09.071] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2016] [Revised: 09/20/2016] [Accepted: 09/21/2016] [Indexed: 12/18/2022]
Abstract
In this study, we report on the first chemical synthesis of ultra-short pyrazole-arginine based antimicrobial peptidomimetics derived from the newly synthesized N-alkyl/aryl pyrazole amino acids. Through the systematic tuning of hydrophobicity, charge, and peptide length, we identified the shortest peptide Py11 with the most potent antimicrobial activity. Py11 displayed greater antimicrobial activity against antibiotic-resistant bacteria, including MRSA, MDRPA, and VREF, which was approximately 2-4 times higher than that of melittin. Besides its higher selectivity (therapeutic index) toward bacterial cells than LL-37, Py11 showed highly increased proteolytic stability against trypsin digestion and maintained its antimicrobial activity in the presence of physiological salts. Interestingly, Py11 exhibited higher anti-biofilm activity against MDRPA compared to LL-37. The results from fluorescence spectroscopy and transmission electron microscopy (TEM) suggested that Py11 kills bacterial cells possibly by integrity disruption damaging the cell membrane, leading to the cytosol leakage and eventual cell lysis. Furthermore, Py11 displayed significant anti-inflammatory (endotoxin-neutralizing) activity by inhibiting LPS-induced production of nitric oxide (NO) and TNF-α. Collectively, our results suggest that Py11 may serve as a model compound for the design of antimicrobial and antisepsis agents.
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Affiliation(s)
- Mija Ahn
- Division of Magnetic Resonance, Korea Basic Science Institute, Ochang, Chung-Buk, 363-883, Republic of Korea
| | - Pethaiah Gunasekaran
- Molecular Embryology Laboratory, Department of Animal Sciences, Chungbuk National University, Chung-Buk, 361-763, Republic of Korea
| | - Ganesan Rajasekaran
- Department of Medical Science, Graduate School and Department of Cellular & Molecular Medicine, School of Medicine, Chosun University, Gwangju, 501-759, Republic of Korea
| | - Eun Young Kim
- Department of Medical Science, Graduate School and Department of Cellular & Molecular Medicine, School of Medicine, Chosun University, Gwangju, 501-759, Republic of Korea
| | - Soo-Jae Lee
- College of Pharmacy, Chungbuk National University, Chungbuk, 361-763, Republic of Korea
| | - Geul Bang
- Biomedical Omics Group, Korea Basic Science Institute, Ochang, Chung-Buk, 363-883, Republic of Korea
| | - Kun Cho
- Biomedical Omics Group, Korea Basic Science Institute, Ochang, Chung-Buk, 363-883, Republic of Korea
| | - Jae-Kyung Hyun
- Division of Electron Microscopic Research, Korea Basic Science Institute, 113 Gwahakro, Daejeon, 305-333, Republic of Korea
| | - Hyun-Ju Lee
- Division of Electron Microscopic Research, Korea Basic Science Institute, 113 Gwahakro, Daejeon, 305-333, Republic of Korea; Department of Chemistry, Chungnam National University, Daejeon, 305-764, Republic of Korea
| | - Young Ho Jeon
- College of Pharmacy, Korea University, 2511 Sejong-Ro, Sejong, 30019, Republic of Korea
| | - Nam-Hyung Kim
- Molecular Embryology Laboratory, Department of Animal Sciences, Chungbuk National University, Chung-Buk, 361-763, Republic of Korea
| | - Eun Kyoung Ryu
- Division of Magnetic Resonance, Korea Basic Science Institute, Ochang, Chung-Buk, 363-883, Republic of Korea; Department of Bio-analytical Science, University of Science & Technology, Daejeon, 34113, Republic of Korea
| | - Song Yub Shin
- Department of Medical Science, Graduate School and Department of Cellular & Molecular Medicine, School of Medicine, Chosun University, Gwangju, 501-759, Republic of Korea.
| | - Jeong Kyu Bang
- Division of Magnetic Resonance, Korea Basic Science Institute, Ochang, Chung-Buk, 363-883, Republic of Korea; Department of Bio-analytical Science, University of Science & Technology, Daejeon, 34113, Republic of Korea.
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Abstract
D-Galactosamine (D-galN) is well established as sensitizing mice and other animals to the lethal effects of TNF, specifically, and by several orders of magnitude. Protection by anti-TNF neutralizing antibody is complete, as is (metabolically-based) protection by uridine. Sensitization occurs regardless of the origin of the released TNF, whether it is released from macrophages and/or T-cells. The same is true for the challenging agent which leads to the release of TNF, whether it is endotoxin, a superantigen, lipoprotein, bacterial DNA, or bacteria, either killed or proliferating. Most studies have utilized endotoxin as the challenging agent, and more than 70 agents have been reported to confer protection against LPS and/or TNF challenge in the model. The model has provided new insight regarding modes of protection, including from dexamethasone, which protects against challenge from LPS but not from challenge by TNF. The D-galN lethality model has also been used to test for synergistic behavior between different bacterial components, and to test for lethality when only small amounts of the challenging agent are available (lipid A chemistry).
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Affiliation(s)
- Richard Silverstein
- Department of Biochemistry and Molecular Biology, University of Kansas Medical Center, Kansas City, Kansas, USA,
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32
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Andrä J, Gutsmann T, Garidel P, Brandenburg K. Invited review: Mechanisms of endotoxin neutralization by synthetic cationic compounds. ACTA ACUST UNITED AC 2016. [DOI: 10.1177/09680519060120050201] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
A basic challenge in the treatment of septic patients in critical care units is the release of bacterial pathogenicity factors such as lipopolysaccharide (LPS, endotoxin) from the cell envelope of Gram-negative bacteria due to killing by antibiotics. LPS aggregates may interact with serum and membrane proteins such as LBP (lipopolysaccharide-binding protein) and CD14 leading to the observed strong reaction of the immune system. Thus, an effective treatment of patients infected by Gram-negative bacteria must comprise beside bacterial killing the neutralization of endotoxins. Here, data are summarized for synthetic compounds indicating the stepwise development to very effective LPS-neutralizing agents. These data include synthetic peptides, based on the endotoxin-binding domains of natural binding proteins such as lactoferrin, Limulus anti-LPS factor, NK-lysin, and cathelicidins or based on LPS sequestering polyamines. Many of these compounds could be shown to act not only in vitro, but also in vivo (e.g . in animal models of sepsis), and might be useful in future clinical trials and in sepsis therapy.
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Affiliation(s)
- Jörg Andrä
- Forschungszentrum Borstel, Biophysics Division, Leibniz-Zentrum für Medizin und Biowissenschaften, Borstel, Germany
| | - Thomas Gutsmann
- Forschungszentrum Borstel, Biophysics Division, Leibniz-Zentrum für Medizin und Biowissenschaften, Borstel, Germany
| | - Patrick Garidel
- Institut für Physikalische Chemie, Martin-Luther-Universität Halle-Wittenberg, Halle, Germany
| | - Klaus Brandenburg
- Forschungszentrum Borstel, Biophysics Division, Leibniz-Zentrum für Medizin und Biowissenschaften, Borstel, Germany,
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33
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Bowdish DM, Hancock RE. Anti-endotoxin properties of cationic host defence peptides and proteins. ACTA ACUST UNITED AC 2016. [DOI: 10.1177/09680519050110040801] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The innate immune system of mammals contains a series of peptides with overall positive charge and an amphipathic structure which have a variety of important properties in host defences. Although these are often termed cationic antimicrobial peptides, they have numerous roles in innate defences in all complex species of life and thus we prefer to refer to them as host defence peptides. These roles include: (i) an ability to kill micro-organisms directly, ranging from bacteria to viruses, fungi, parasites and helminths; (ii) an adjuvant activity in the adaptive response; and (iii) a multiplicity of roles in modulating innate immunity, including an apparent ability to stimulate protective innate immunity while suppressing harmful inflammatory/septic responses. This latter property may be one of the more important activities of these peptides in vivo. Innate immunity is thought to be triggered by the interaction of conserved bacterial components with particular receptors including Toll-like receptors (TLRs) on host cells. However, the initiation of the innate immune response through this route may trigger a pro-inflammatory cascade that is the principle cause of harmful conditions such as sepsis. Since we are exposed to potentially dangerous pathogens on a daily basis, the host response must contain certain checks and balances. We propose that host defence peptides have a role in feed-back modulation of inflammation under normal (low-pathogen exposure) conditions. This review surveys the available information regarding the antiendotoxic/anti-inflammatory properties of host defence peptides, and will address whether this potential might be exploited for therapeutic benefit in sepsis.
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Affiliation(s)
- Dawn M.E. Bowdish
- Centre for Microbial Diseases and Immunity Research, University of British Columbia, Vancouver, British Columbia, Canada
| | - Robert E.W. Hancock
- Centre for Microbial Diseases and Immunity Research, University of British Columbia, Vancouver, British Columbia, Canada,
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Antibacterial effects of Lactobacillus and bacteriocin PLNC8 αβ on the periodontal pathogen Porphyromonas gingivalis. BMC Microbiol 2016; 16:188. [PMID: 27538539 PMCID: PMC4990846 DOI: 10.1186/s12866-016-0810-8] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2016] [Accepted: 08/12/2016] [Indexed: 11/18/2022] Open
Abstract
Background The complications in healthcare systems associated with antibiotic-resistant microorganisms have resulted in an intense search for new effective antimicrobials. Attractive substances from which novel antibiotics may be developed are the bacteriocins. These naturally occurring peptides are generally considered to be safe and efficient at eliminating pathogenic bacteria. Among specific keystone pathogens in periodontitis, Porphyromonas gingivalis is considered to be the most important pathogen in the development and progression of chronic inflammatory disease. The aim of the present study was to investigate the antimicrobial effects of different Lactobacillus species and the two-peptide bacteriocin PLNC8 αβ on P. gingivalis. Results Growth inhibition of P. gingivalis was obtained by viable Lactobacillus and culture media from L. plantarum NC8 and 44048, but not L. brevis 30670. The two-peptide bacteriocin from L. plantarum NC8 (PLNC8 αβ) was found to be efficient against P. gingivalis through binding followed by permeabilization of the membranes, using Surface plasmon resonance analysis and DNA staining with Sytox Green. Liposomal systems were acquired to verify membrane permeabilization by PLNC8 αβ. The antimicrobial activity of PLNC8 αβ was found to be rapid (1 min) and visualized by TEM to cause cellular distortion through detachment of the outer membrane and bacterial lysis. Conclusion Soluble or immobilized PLNC8 αβ bacteriocins may be used to prevent P. gingivalis colonization and subsequent pathogenicity, and thus supplement the host immune system against invading pathogens associated with periodontitis. Electronic supplementary material The online version of this article (doi:10.1186/s12866-016-0810-8) contains supplementary material, which is available to authorized users.
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Uppu DSSM, Haldar J. Lipopolysaccharide Neutralization by Cationic-Amphiphilic Polymers through Pseudoaggregate Formation. Biomacromolecules 2016; 17:862-73. [DOI: 10.1021/acs.biomac.5b01567] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Divakara S. S. M. Uppu
- Chemical Biology & Medicinal Chemistry Laboratory, New Chemistry Unit (NCU), Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur, Bengaluru, Karnataka 560064, India
| | - Jayanta Haldar
- Chemical Biology & Medicinal Chemistry Laboratory, New Chemistry Unit (NCU), Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur, Bengaluru, Karnataka 560064, India
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The C-terminal Domain Supports a Novel Function for CETPI as a New Plasma Lipopolysaccharide-Binding Protein. Sci Rep 2015; 5:16091. [PMID: 26537318 PMCID: PMC4633601 DOI: 10.1038/srep16091] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2015] [Accepted: 10/08/2015] [Indexed: 12/22/2022] Open
Abstract
Described by our group a few years ago, the cholesteryl-ester transfer protein isoform (CETPI), exclusively expressed in the small intestine and present in human plasma, lacked a functional identification for a role of physiological relevance. Now, this study introduces CETPI as a new protein with the potential capability to recognise, bind and neutralise lipopolysaccharides (LPS). Peptides derived from the C-terminal domain of CETPI showed that CETPI not only might interact with several LPS serotypes but also might displace LPS bound to the surface of cells. Peptide VSAK, derived from the last 18 residues of CETPI, protected against the cytotoxic effect of LPS on macrophages. At high concentrations, when different cell types were tested in culture, it did not exhibit cytotoxicity by itself and it did prevent the expression of pro-inflammatory cytokines as well as the generation of oxidative stress conditions. In a rabbit model of septic shock, the infusion of peptide VSAK exerted a protective effect against the effects of LPS and reduced the presence of tumor necrosis factor-alpha (TNFα) in plasma. Therefore, CETPI is proposed as a new protein with the capability to advance the possibilities for better understanding and treatment of the dangerous effects of LPS in vivo.
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The Potential Use of Natural and Structural Analogues of Antimicrobial Peptides in the Fight against Neglected Tropical Diseases. Molecules 2015; 20:15392-433. [PMID: 26305243 PMCID: PMC6332049 DOI: 10.3390/molecules200815392] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2015] [Revised: 08/02/2015] [Accepted: 08/10/2015] [Indexed: 12/13/2022] Open
Abstract
Recently, research into the development of new antimicrobial agents has been driven by the increase in resistance to traditional antibiotics and Emerging Infectious Diseases. Antimicrobial peptides (AMPs) are promising candidates as alternatives to current antibiotics in the treatment and prevention of microbial infections. AMPs are produced by all known living species, displaying direct antimicrobial killing activity and playing an important role in innate immunity. To date, more than 2000 AMPs have been discovered and many of these exhibit broad-spectrum antibacterial, antiviral and anti-parasitic activity. Neglected tropical diseases (NTDs) are caused by a variety of pathogens and are particularly wide-spread in low-income and developing regions of the world. Alternative, cost effective treatments are desperately needed to effectively battle these medically diverse diseases. AMPs have been shown to be effective against a variety of NTDs, including African trypanosomes, leishmaniosis and Chagas disease, trachoma and leprosy. In this review, the potential of selected AMPs to successfully treat a variety of NTD infections will be critically evaluated.
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38
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Meloni M, Candusso S, Galeotti M, Volpatti D. Preliminary study on expression of antimicrobial peptides in European sea bass (Dicentrarchus labrax) following in vivo infection with Vibrio anguillarum. A time course experiment. FISH & SHELLFISH IMMUNOLOGY 2015; 43:82-90. [PMID: 25542381 DOI: 10.1016/j.fsi.2014.12.016] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2014] [Revised: 12/05/2014] [Accepted: 12/15/2014] [Indexed: 06/04/2023]
Abstract
Antimicrobial polypeptides (AMPPs) are humoral components of the vertebrates and invertebrates innate immune system. Their potent broad spectrum antimicrobial activities have drawn the attention of the scientific community to their potential use not only as an alternative to antibiotics but also as functional targets for immunostimulants in order to enhance the host immunity. Fish synthesize a great number of these peptides but in European sea bass, an important fish species in the Mediterranean aquaculture, only a few AMPPs have been studied and these surveys have highlighted their functional role as predictive markers of stressful conditions. Many aspects concerning AMPP mode of action in the host during bacterial infections are still unknown. In this work a 72 h time course experiment, performed on juvenile sea bass intraperitoneally (i.p.) injected with a sub-lethal dose of Vibrio anguillarum, was aimed to investigate the mRNA expression of four specific AMPP genes and interleukin-1β (IL-1β) in skin, gills, spleen, and head kidney. AMPP genes were: dicentracin (DIC), histone-like protein 1 (HLP-1), histone-like protein 2 (HLP-2) and hemoglobin-like protein (Hb-LP). The delta-delta C(T) method in real-time RT-PCR allowed to gain more knowledge about temporal dynamics, preferential sites of expression as well as immunological and physiological role of these molecular markers. DIC was significantly up-regulated mainly in head kidney at 1.5-3 h post-infection (p.i.). HLP-1 showed an extended-time overexpression in gills and a significant up-regulation in spleen. HLP-2 was interestingly overexpressed in gills at 24 h p.i., while Hb-LP showed a significant up-regulation in skin for all the 72 h trial as well as lower but always significant values either in gills or in spleen. Different was the response of IL-1β that showed a dramatic up-regulation in spleen and head kidney at 8 h p.i. whilst in gills it displayed a severe inhibition. During this survey the i.p. stimulus surely conditioned the AMPP expression in skin and gills, especially as regards the DIC that as piscidin-related gene has an important defensive role in the mucosal tissues. However, two unconventional AMPP genes such as HLP-2 and Hb-LP, strictly related to the physiological mechanisms of fish, were less affected in terms of expression by the route of infection, being more evident in peripheral loci. These findings might suggest them as potential markers to be analyzed within plans of health survey in fish farms.
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Affiliation(s)
- Mauro Meloni
- Department of Food Sciences, Section of Veterinary Pathology, University of Udine, via Sondrio 2/A, 33100 Udine, Italy.
| | - Sabrina Candusso
- Department of Food Sciences, Section of Veterinary Pathology, University of Udine, via Sondrio 2/A, 33100 Udine, Italy
| | - Marco Galeotti
- Department of Food Sciences, Section of Veterinary Pathology, University of Udine, via Sondrio 2/A, 33100 Udine, Italy
| | - Donatella Volpatti
- Department of Food Sciences, Section of Veterinary Pathology, University of Udine, via Sondrio 2/A, 33100 Udine, Italy
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Lim HS, Chun SM, Soung MG, Kim J, Kim SJ. Antimicrobial efficacy of granulysin-derived synthetic peptides in acne vulgaris. Int J Dermatol 2015; 54:853-62. [PMID: 25601314 DOI: 10.1111/ijd.12756] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/09/2013] [Revised: 04/30/2014] [Accepted: 05/03/2014] [Indexed: 12/27/2022]
Abstract
BACKGROUND Antimicrobial peptides are considered as a potential alternative to antibiotic treatment in acne vulgaris because the development of a resistant strain of Propionibacterium acnes is problematic. Granulysin can be regarded as an ideal substance with which to treat acne because it has antimicrobial and anti-inflammatory effects. OBJECTIVES This study was performed to explore the effectiveness of granulysin-derived peptides (GDPs) in killing P. acnes in vitro under a standard microbiologic assay and to evaluate their potential use in a topical agent for the treatment of acne vulgaris. METHODS Twenty different peptides based on the known sequence of a GDP were synthesized and tested in vitro for antimicrobial activity. Thirty patients with facial acne vulgaris were instructed to apply a topical formulation containing synthetic GDP to acne lesions twice per day for 12 weeks. RESULTS A newly synthesized peptide in which aspartic acid was substituted with arginine, and methionine was substituted with cysteine, showed the highest antimicrobial activity against P. acnes. Moreover, it was effective against both Gram-positive and Gram-negative bacteria in vitro. After treatment with the topical formulation containing 50 ppm of synthetic peptide for 12 weeks, a significant reduction in the number of pustules was observed, regardless of the increase in the number of comedones. In addition, a significant reduction in the clinical grade of acne based on the Korean Acne Grading System (KAGS) was evident. CONCLUSIONS Synthesized GDP shows strong antimicrobial activity against P. acnes in vitro. The clinical improvement observed suggests a topical formulation containing the GDP has therapeutic potential for the improvement of inflammatory-type acne vulgaris by its antimicrobial activity.
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Affiliation(s)
- Hee-Sun Lim
- Department of Dermatology, Chonnam National University Medical School, Gwangju, South Korea
| | - Seung-Min Chun
- Department of Dermatology, Chonnam National University Medical School, Gwangju, South Korea
| | - Min-Gyu Soung
- Department of Applied Biology and Chemistry, College of Agriculture and Life Science, Chungnam National University, Daejeon, South Korea.,Cellicon Laboratory, Hannam University, Daejeon, South Korea
| | - Jenny Kim
- Division of Dermatology, David Geffen School of Medicine, UCLA
| | - Seong-Jin Kim
- Department of Dermatology, Chonnam National University Medical School, Gwangju, South Korea
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40
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Deveci A, Coban AY. Optimum management of Citrobacter koseri infection. Expert Rev Anti Infect Ther 2014; 12:1137-42. [DOI: 10.1586/14787210.2014.944505] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Aydin Deveci
- Department of Infectious Disease and Clinical Microbiology, Medical School, Ondokuz Mayis University,
55139, Samsun, Turkey
| | - Ahmet Yilmaz Coban
- Department of Medical Microbiology, Medical School, Ondokuz Mayis University,
55139, Samsun, Turkey
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41
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Martis N, Leroy S, Blanc V. Colistin in multi-drug resistant Pseudomonas aeruginosa blood-stream infections. J Infect 2014; 69:1-12. [DOI: 10.1016/j.jinf.2014.03.001] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2013] [Revised: 02/16/2014] [Accepted: 03/01/2014] [Indexed: 10/25/2022]
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42
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Ryder MP, Wu X, McKelvey GR, McGuire J, Schilke KF. Binding interactions of bacterial lipopolysaccharide and the cationic amphiphilic peptides polymyxin B and WLBU2. Colloids Surf B Biointerfaces 2014; 120:81-7. [PMID: 24905681 DOI: 10.1016/j.colsurfb.2014.05.004] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2013] [Revised: 05/01/2014] [Accepted: 05/02/2014] [Indexed: 11/26/2022]
Abstract
Passage of blood through a sorbent device for removal of bacteria and endotoxin by specific binding with immobilized, membrane-active, bactericidal peptides holds promise for treating severe blood infections. Peptide insertion in the target membrane and rapid/strong binding is desirable, while membrane disruption and release of degradation products to the circulating blood is not. Here we describe interactions between bacterial endotoxin (lipopolysaccharide, LPS) and the membrane-active, bactericidal peptides WLBU2 and polymyxin B (PmB). Analysis of the interfacial behavior of mixtures of LPS and peptide using air-water interfacial tensiometry and optical waveguide lightmode spectroscopy strongly suggests insertion of intact LPS vesicles by the peptide WLBU2 without vesicle destabilization. In contrast, dynamic light scattering (DLS) studies show that LPS vesicles appear to undergo peptide-induced destabilization in the presence of PmB. Circular dichroism spectra further confirm that WLBU2, which shows disordered structure in aqueous solution and substantially helical structure in membrane-mimetic environments, is stably located within the LPS membrane in peptide-vesicle mixtures. We therefore expect that presentation of WLBU2 at an interface, if tethered in a fashion which preserves its mobility and solvent accessibility, will enable the capture of bacteria and endotoxin without promoting reintroduction of endotoxin to the circulating blood, thus minimizing adverse clinical outcomes. On the other hand, our results suggest no such favorable outcome of LPS interactions with polymyxin B.
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Affiliation(s)
- Matthew P Ryder
- School of Chemical, Biological and Environmental Engineering, Oregon State University, Corvallis, OR 97331, United States
| | - Xiangming Wu
- School of Chemical, Biological and Environmental Engineering, Oregon State University, Corvallis, OR 97331, United States
| | - Greg R McKelvey
- School of Chemical, Biological and Environmental Engineering, Oregon State University, Corvallis, OR 97331, United States
| | - Joseph McGuire
- School of Chemical, Biological and Environmental Engineering, Oregon State University, Corvallis, OR 97331, United States
| | - Karl F Schilke
- School of Chemical, Biological and Environmental Engineering, Oregon State University, Corvallis, OR 97331, United States.
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43
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Brogden KA, Johnson GK, Vincent SD, Abbasi T, Vali S. Oral inflammation, a role for antimicrobial peptide modulation of cytokine and chemokine responses. Expert Rev Anti Infect Ther 2014; 11:1097-113. [DOI: 10.1586/14787210.2013.836059] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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44
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Murugan RN, Jacob B, Ahn M, Hwang E, Sohn H, Park HN, Lee E, Seo JH, Cheong C, Nam KY, Hyun JK, Jeong KW, Kim Y, Shin SY, Bang JK. De novo design and synthesis of ultra-short peptidomimetic antibiotics having dual antimicrobial and anti-inflammatory activities. PLoS One 2013; 8:e80025. [PMID: 24302996 PMCID: PMC3841161 DOI: 10.1371/journal.pone.0080025] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2013] [Accepted: 09/27/2013] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Much attention has been focused on the design and synthesis of potent, cationic antimicrobial peptides (AMPs) that possess both antimicrobial and anti-inflammatory activities. However, their development into therapeutic agents has been limited mainly due to their large size (12 to 50 residues in length) and poor protease stability. METHODOLOGY/PRINCIPAL FINDINGS In an attempt to overcome the issues described above, a set of ultra-short, His-derived antimicrobial peptides (HDAMPs) has been developed for the first time. Through systematic tuning of pendant hydrophobic alkyl tails at the N(π)- and N(τ)-positions on His, and the positive charge of Arg, much higher prokaryotic selectivity was achieved, compared to human AMP LL-37. Additionally, the most potent HDAMPs showed promising dual antimicrobial and anti-inflammatory activities, as well as anti-methicillin-resistant Staphylococcus aureus (MRSA) activity and proteolytic resistance. Our results from transmission electron microscopy, membrane depolarization, confocal laser-scanning microscopy, and calcein-dye leakage experiments propose that HDAMP-1 kills microbial cells via dissipation of the membrane potential by forming pore/ion channels on bacterial cell membranes. CONCLUSION/SIGNIFICANCE The combination of the ultra-short size, high-prokaryotic selectivity, potent anti-MRSA activity, anti-inflammatory activity, and proteolytic resistance of the designed HDAMP-1, -3, -5, and -6 makes these molecules promising candidates for future antimicrobial therapeutics.
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Affiliation(s)
- Ravichandran N. Murugan
- Division of Magnetic Resonance, Korea Basic Science Institute, Ochang, Chung-Buk, Republic of Korea
| | - Binu Jacob
- Department of Bio-Materials, Graduate School and Department of Cellular & Molecular Medicine, School of Medicine, Chosun University, Gwangju, Republic of Korea
| | - Mija Ahn
- Division of Magnetic Resonance, Korea Basic Science Institute, Ochang, Chung-Buk, Republic of Korea
| | - Eunha Hwang
- Division of Magnetic Resonance, Korea Basic Science Institute, Ochang, Chung-Buk, Republic of Korea
| | - Hoik Sohn
- Department of Chemistry and Biochemistry, University of Texas at Austin, Austin, Texas, United States of America
| | - Hyo-Nam Park
- Division of Electron Microscopic Research, Korea Basic Science Institute, Daejeon, Republic of Korea
| | - Eunjung Lee
- Department of Bioscience and Biotechnology, Institute of SMART Biotechnology, Konkuk University, Seoul, Republic of Korea
| | - Ji-Hyung Seo
- Division of Magnetic Resonance, Korea Basic Science Institute, Ochang, Chung-Buk, Republic of Korea
| | - Chaejoon Cheong
- Division of Magnetic Resonance, Korea Basic Science Institute, Ochang, Chung-Buk, Republic of Korea
| | - Ky-Youb Nam
- Bioinformatics and Molecular Design Research Center, Yonsei University Research Complex, Seoul, Republic of Korea
| | - Jae-Kyung Hyun
- Division of Electron Microscopic Research, Korea Basic Science Institute, Daejeon, Republic of Korea
| | - Ki-Woong Jeong
- Department of Bioscience and Biotechnology, Institute of SMART Biotechnology, Konkuk University, Seoul, Republic of Korea
| | - Yangmee Kim
- Department of Bioscience and Biotechnology, Institute of SMART Biotechnology, Konkuk University, Seoul, Republic of Korea
| | - Song Yub Shin
- Department of Bio-Materials, Graduate School and Department of Cellular & Molecular Medicine, School of Medicine, Chosun University, Gwangju, Republic of Korea
- * E-mail: (JKB); (SYS)
| | - Jeong Kyu Bang
- Division of Magnetic Resonance, Korea Basic Science Institute, Ochang, Chung-Buk, Republic of Korea
- * E-mail: (JKB); (SYS)
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45
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Jacob B, Park IS, Bang JK, Shin SY. Short KR-12 analogs designed from human cathelicidin LL-37 possessing both antimicrobial and antiendotoxic activities without mammalian cell toxicity. J Pept Sci 2013; 19:700-7. [PMID: 24105706 DOI: 10.1002/psc.2552] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2013] [Revised: 08/08/2013] [Accepted: 08/14/2013] [Indexed: 11/08/2022]
Abstract
KR-12 (residues 18-29 of LL-37) was known to be the smallest peptide of human cathelicidin LL-37 possessing antimicrobial activity. In order to optimize α-helical short antimicrobial peptides having both antimicrobial and antiendotoxic activities without mammalian cell toxicity, we designed and synthesized a series of KR-12 analogs. Highest hydrophobic analogs KR-12-a5 and KR-12-a6 displayed greater inhibition of lipopolysaccharide (LPS)-stimulated tumor necrosis factor-α production and higher LPS-binding activity. We have observed that antimicrobial activity is independent of charge, but LPS neutralization requires a balance of hydrophobicity and net positive charge. Among KR-12 analogs, KR-12-a2, KR-12-a3 and KR-12-a4 showed much higher cell specificity for bacteria over erythrocytes and retained antiendotoxic activity, relative to parental LL-37. KR-12-a5 displayed the strongest antiendotoxic activity but almost similar cell specificity as compared with LL-37. Also, these KR-12 analogs (KR-12-a2, KR-12-a3, KR-12-a4 and KR-12-a5) exhibited potent antimicrobial activity (minimal inhibitory concentration: 4 μM) against methicillin-resistant Staphylococcus aureus. Taken together, these KR-12 analogs have the potential for future development as a novel class of antimicrobial and anti-inflammatory therapeutic agents.
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Affiliation(s)
- Binu Jacob
- Department of Bio-Materials, Graduate School, Chosun University, Gwangju, 501-759, Korea
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46
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Luca V, Stringaro A, Colone M, Pini A, Mangoni ML. Esculentin(1-21), an amphibian skin membrane-active peptide with potent activity on both planktonic and biofilm cells of the bacterial pathogen Pseudomonas aeruginosa. Cell Mol Life Sci 2013; 70:2773-86. [PMID: 23503622 PMCID: PMC11113931 DOI: 10.1007/s00018-013-1291-7] [Citation(s) in RCA: 128] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2012] [Revised: 01/26/2013] [Accepted: 02/05/2013] [Indexed: 12/23/2022]
Abstract
Pseudomonas aeruginosa is an opportunistic bacterial pathogen that forms sessile communities, named biofilms. The non-motile forms are very difficult to eradicate and are often associated with the establishment of persistent infections, especially in patients with cystic fibrosis. The resistance of P. aeruginosa to conventional antibiotics has become a growing health concern worldwide and has prompted the search for new anti-infective agents with new modes of action. Naturally occurring antimicrobial peptides (AMPs) represent promising future template candidates. Here we report on the potent activity and membrane-perturbing effects of the amphibian AMP esculentin(1-21), on both the free-living and sessile forms of P. aeruginosa, as a possible mechanism for biofilm disruption. Furthermore, the findings that esculentin(1-21) is able to prolong survival of animals in models of sepsis and pulmonary infection indicate that this peptide can be a promising template for the generation of new antibiotic formulations to advance care of infections caused by P. aeruginosa.
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Affiliation(s)
- Vincenzo Luca
- Dipartimento di Scienze Biochimiche “A. Rossi Fanelli”, Istituto Pasteur-Fondazione Cenci Bolognetti, Sapienza Università di Roma, Rome, Italy
| | - Annarita Stringaro
- Dipartimento di Tecnologie e Salute, Istituto Superiore di Sanità, Rome, Italy
| | - Marisa Colone
- Dipartimento di Tecnologie e Salute, Istituto Superiore di Sanità, Rome, Italy
| | - Alessandro Pini
- Dipartimento di Biotecnologie Mediche, Università degli Studi di Siena, Siena, Italy
| | - Maria Luisa Mangoni
- Dipartimento di Scienze Biochimiche “A. Rossi Fanelli”, Istituto Pasteur-Fondazione Cenci Bolognetti, Sapienza Università di Roma, Rome, Italy
- Department of Biochemical Sciences, La Sapienza University, Via degli Apuli 9, 00185 Rome, Italy
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47
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Colistin bladder instillation, an alternative way of treating multi-resistant Acinetobacter urinary tract infection: a case series and review of literature. Infection 2013; 42:199-202. [DOI: 10.1007/s15010-013-0507-y] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2013] [Accepted: 07/08/2013] [Indexed: 10/26/2022]
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48
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Identification of cell-penetrating peptides that are bactericidal to Neisseria meningitidis and prevent inflammatory responses upon infection. Antimicrob Agents Chemother 2013; 57:3704-12. [PMID: 23689723 DOI: 10.1128/aac.00624-13] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Meningococcal disease is characterized by a fast progression and a high mortality rate. Cell-penetrating peptides (CPPs), developed as vectors for cargo delivery into eukaryotic cells, share structural features with antimicrobial peptides. A screen identified two CPPs, transportan-10 (TP10) and model amphipathic peptide (MAP), with bactericidal action against Neisseria meningitidis. Both peptides were active in human whole blood at micromolar concentrations, while hemolysis remained negligible. Additionally, TP10 exhibited significant antibacterial activity in vivo. Uptake of SYTOX green into live meningococci was observed within minutes after TP10 treatment, suggesting that TP10 may act by membrane permeabilization. Apart from its bactericidal activity, TP10 suppressed inflammatory cytokine release from macrophages infected with N. meningitidis as well as from macrophages stimulated with enterobacterial and meningococcal lipopolysaccharide (LPS). Finally, incubation with TP10 reduced the binding of LPS to macrophages. This novel endotoxin-inhibiting property of TP10, together with its antimicrobial activity in vivo, indicates the possibility to design peptide-based therapies for infectious diseases.
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49
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Li W, Mochizuki S, Sakurai K. Structural Transition of Lipopolysaccharide and Reduction in the Biological Activity by Amphiphilic Lipid with Cationic Amino Acid. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2013. [DOI: 10.1246/bcsj.20120353] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Wenjing Li
- Department of Chemistry and Biochemistry, The University of Kitakyushu
| | | | - Kazuo Sakurai
- Department of Chemistry and Biochemistry, The University of Kitakyushu
- CREST, Japan Science and Technology Agency
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50
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Marr AK, McGwire BS, McMaster WR. Modes of action of Leishmanicidal antimicrobial peptides. Future Microbiol 2013; 7:1047-59. [PMID: 22953706 DOI: 10.2217/fmb.12.85] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Leishmaniasis is one of the major neglected tropical diseases of the world. It is present in 88 countries with an estimated number of 500,000 cases of visceral leishmaniasis and 1.5 million cases of cutaneous disease. No effective vaccinations are available against leishmaniasis and the efficacy of existing treatments is compromised due to the emergence of drug resistance. Thus, there is an urgent need to develop new compounds with antileishmanial activity. Antimicrobial peptides have potential as novel antileishmanial therapy, either for use alone or in combination with current drug regimens. The modes of action of these peptides against Leishmania includes: membrane disruption leading to necrotic cell death; induction of apoptosis; binding to intracellular target(s); and indirect effects via immunomodulation of host immune cells. This article reviews the mechanisms of action of antimicrobial peptides with leishmanicidal activity.
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Affiliation(s)
- Alexandra K Marr
- Immunity & Infection Research Centre, Vancouver Coastal Health Research Institute, Vancouver, BC, Canada
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