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Wang Y, Shi D, Zou W, Jiang Y, Wang T, Chen X, Ma C, Li W, Chen T, Burrows JF, Wang L, Zhou M. An Effective Modification Strategy to Build Multifunctional Peptides Based on a Trypsin Inhibitory Peptide of the Kunitz Family. Pharmaceutics 2024; 16:597. [PMID: 38794259 PMCID: PMC11125039 DOI: 10.3390/pharmaceutics16050597] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2024] [Revised: 04/18/2024] [Accepted: 04/25/2024] [Indexed: 05/26/2024] Open
Abstract
Peptides with antimicrobial activity or protease inhibitory activity are potential candidates to supplement traditional antibiotics or cancer chemotherapies. However, the potential of many peptides are limited by drawbacks such as cytotoxicity or susceptibility to hydrolysis. Therefore, strategies to modify the structure of promising peptides may represent an effective approach for developing more promising clinical candidates. In this study, the mature peptide OSTI-1949, a Kunitz-type inhibitor from Odorrana schmackeri, and four designed analogues were successfully synthesised. In contrast to the parent peptide, the analogues showed impressive multi-functionality including antimicrobial, anticancer, and trypsin inhibitory activities. In terms of safety, there were no obvious changes observed in the haemolytic activity at the highest tested concentration, and the analogue OSTI-2461 showed an increase in activity against cancer cell lines without cytotoxicity to normal cells (HaCaT). In summary, through structural modification of a natural Kunitz-type peptide, the biological activity of analogues was improved whilst retaining low cytotoxicity. The strategy of helicity enhancement by forming an artificial α-helix and ß-sheet structure provides a promising way to develop original bioactive peptides for clinical therapeutics.
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Affiliation(s)
- Ying Wang
- Natural Drug Discovery Group, School of Pharmacy, Queen’s University Belfast, Belfast BT9 7BL, Northern Ireland, UK; (Y.W.); (W.Z.); (Y.J.); (T.W.); (C.M.); (T.C.); (J.F.B.); (L.W.); (M.Z.)
| | - Daning Shi
- Chinese Academy of Agricultural Sciences, No.12 Zhongguancun South Street, Haidian District, Beijing 100081, China;
| | - Wanchen Zou
- Natural Drug Discovery Group, School of Pharmacy, Queen’s University Belfast, Belfast BT9 7BL, Northern Ireland, UK; (Y.W.); (W.Z.); (Y.J.); (T.W.); (C.M.); (T.C.); (J.F.B.); (L.W.); (M.Z.)
- College of Chinese Medicinal Materials, Jilin Provincial International Joint Research Center for the Development and Utilization of Authentic Medicinal Materials, Jilin Agricultural University, Changchun 130118, China
| | - Yangyang Jiang
- Natural Drug Discovery Group, School of Pharmacy, Queen’s University Belfast, Belfast BT9 7BL, Northern Ireland, UK; (Y.W.); (W.Z.); (Y.J.); (T.W.); (C.M.); (T.C.); (J.F.B.); (L.W.); (M.Z.)
| | - Tao Wang
- Natural Drug Discovery Group, School of Pharmacy, Queen’s University Belfast, Belfast BT9 7BL, Northern Ireland, UK; (Y.W.); (W.Z.); (Y.J.); (T.W.); (C.M.); (T.C.); (J.F.B.); (L.W.); (M.Z.)
| | - Xiaoling Chen
- Natural Drug Discovery Group, School of Pharmacy, Queen’s University Belfast, Belfast BT9 7BL, Northern Ireland, UK; (Y.W.); (W.Z.); (Y.J.); (T.W.); (C.M.); (T.C.); (J.F.B.); (L.W.); (M.Z.)
| | - Chengbang Ma
- Natural Drug Discovery Group, School of Pharmacy, Queen’s University Belfast, Belfast BT9 7BL, Northern Ireland, UK; (Y.W.); (W.Z.); (Y.J.); (T.W.); (C.M.); (T.C.); (J.F.B.); (L.W.); (M.Z.)
| | - Wei Li
- College of Chinese Medicinal Materials, Jilin Provincial International Joint Research Center for the Development and Utilization of Authentic Medicinal Materials, Jilin Agricultural University, Changchun 130118, China
| | - Tianbao Chen
- Natural Drug Discovery Group, School of Pharmacy, Queen’s University Belfast, Belfast BT9 7BL, Northern Ireland, UK; (Y.W.); (W.Z.); (Y.J.); (T.W.); (C.M.); (T.C.); (J.F.B.); (L.W.); (M.Z.)
| | - James F. Burrows
- Natural Drug Discovery Group, School of Pharmacy, Queen’s University Belfast, Belfast BT9 7BL, Northern Ireland, UK; (Y.W.); (W.Z.); (Y.J.); (T.W.); (C.M.); (T.C.); (J.F.B.); (L.W.); (M.Z.)
| | - Lei Wang
- Natural Drug Discovery Group, School of Pharmacy, Queen’s University Belfast, Belfast BT9 7BL, Northern Ireland, UK; (Y.W.); (W.Z.); (Y.J.); (T.W.); (C.M.); (T.C.); (J.F.B.); (L.W.); (M.Z.)
| | - Mei Zhou
- Natural Drug Discovery Group, School of Pharmacy, Queen’s University Belfast, Belfast BT9 7BL, Northern Ireland, UK; (Y.W.); (W.Z.); (Y.J.); (T.W.); (C.M.); (T.C.); (J.F.B.); (L.W.); (M.Z.)
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Sarkar S, Kumari A, Tiwari M, Tiwari V. Interaction and simulation studies suggest the possible molecular targets of intrinsically disordered amyloidogenic antimicrobial peptides in Acinetobacter baumannii. J Biomol Struct Dyn 2024; 42:2747-2764. [PMID: 37144752 DOI: 10.1080/07391102.2023.2208219] [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: 01/16/2023] [Accepted: 04/20/2023] [Indexed: 05/06/2023]
Abstract
Acinetobacter baumannii is one of the causing agents of nosocomial infections. A wide range of antibiotics fails to work against these pathogens. Hence, there is an urgent requirement to develop other therapeutics to solve this problem. Antimicrobial peptides (AMPs) are a diverse group of naturally occurring peptides that have the ability to kill diverse groups of microorganisms. The major challenge of using AMPs as therapeutics is their unstable nature and the fact that most of their molecular targets are still unknown. In this study, we have selected intrinsically disordered and amyloidogenic AMPs, showing activity against A. baumannii, that is, Bactenecin, Cath BF, Citropin 1.1, DP7, NA-CATH, Tachyplesin, and WAM-1. To identify the probable target of these AMPs in A. baumannii, calculation of docking score, binding energy, dissociation constant, and molecular dynamics analysis was performed with selected seventeen possible molecular targets. The result showed that the most probable molecular targets of most of the intrinsically disordered amyloidogenic AMPs were UDP-N-acetylenol-pyruvoyl-glucosamine reductase (MurB), followed by 33-36 kDa outer membrane protein (Omp 33-36), UDP-N-acetylmuramoyl-l-alanyl-d-glutamate-2,6-diaminopimelate ligase (MurE), and porin Subfamily Protein (PorinSubF). Further, molecular dynamics analysis concluded that the target of antimicrobial peptide Bactenecin is MurB of A. baumannii, and identified other molecular targets of selected AMPs. Additionally, the oligomerization capacity of the selected AMPs was also investigated, and it was shown that the selected AMPs form oligomeric states, and interact with their molecular targets in that state. Experimental validation using purified AMPs and molecular targets needs to be done to confirm the interaction.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Sayani Sarkar
- Department of Biochemistry, Central University of Rajasthan, Ajmer, India
| | - Aruna Kumari
- Department of Biochemistry, Central University of Rajasthan, Ajmer, India
| | - Monalisa Tiwari
- Department of Biochemistry, Central University of Rajasthan, Ajmer, India
| | - Vishvanath Tiwari
- Department of Biochemistry, Central University of Rajasthan, Ajmer, India
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Rangel K, Lechuga GC, Provance DW, Morel CM, De Simone SG. An Update on the Therapeutic Potential of Antimicrobial Peptides against Acinetobacter baumannii Infections. Pharmaceuticals (Basel) 2023; 16:1281. [PMID: 37765087 PMCID: PMC10537560 DOI: 10.3390/ph16091281] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2023] [Revised: 08/09/2023] [Accepted: 09/06/2023] [Indexed: 09/29/2023] Open
Abstract
The rise in antibiotic-resistant strains of clinically important pathogens is a major threat to global health. The World Health Organization (WHO) has recognized the urgent need to develop alternative treatments to address the growing list of priority pathogens. Antimicrobial peptides (AMPs) rank among the suggested options with proven activity and high potential to be developed into effective drugs. Many AMPs are naturally produced by living organisms protecting the host against pathogens as a part of their innate immunity. Mechanisms associated with AMP actions include cell membrane disruption, cell wall weakening, protein synthesis inhibition, and interference in nucleic acid dynamics, inducing apoptosis and necrosis. Acinetobacter baumannii is a critical pathogen, as severe clinical implications have developed from isolates resistant to current antibiotic treatments and conventional control procedures, such as UV light, disinfectants, and drying. Here, we review the natural AMPs representing primary candidates for new anti-A. baumannii drugs in post-antibiotic-era and present computational tools to develop the next generation of AMPs with greater microbicidal activity and reduced toxicity.
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Affiliation(s)
- Karyne Rangel
- Center for Technological Development in Health (CDTS), National Institute of Science and Technology for Innovation in Neglected Population Diseases (INCT-IDPN), Oswaldo Cruz Institut, Oswaldo Cruz Foundation, Rio de Janeiro 21040-900, RJ, Brazil; (K.R.); (G.C.L.); (D.W.P.J.); (C.M.M.)
- Epidemiology and Molecular Systematics Laboratory (LEMS), Oswaldo Cruz Institut, Oswaldo Cruz Foundation, Rio de Janeiro 21040-900, RJ, Brazil
| | - Guilherme Curty Lechuga
- Center for Technological Development in Health (CDTS), National Institute of Science and Technology for Innovation in Neglected Population Diseases (INCT-IDPN), Oswaldo Cruz Institut, Oswaldo Cruz Foundation, Rio de Janeiro 21040-900, RJ, Brazil; (K.R.); (G.C.L.); (D.W.P.J.); (C.M.M.)
- Epidemiology and Molecular Systematics Laboratory (LEMS), Oswaldo Cruz Institut, Oswaldo Cruz Foundation, Rio de Janeiro 21040-900, RJ, Brazil
| | - David W. Provance
- Center for Technological Development in Health (CDTS), National Institute of Science and Technology for Innovation in Neglected Population Diseases (INCT-IDPN), Oswaldo Cruz Institut, Oswaldo Cruz Foundation, Rio de Janeiro 21040-900, RJ, Brazil; (K.R.); (G.C.L.); (D.W.P.J.); (C.M.M.)
- Epidemiology and Molecular Systematics Laboratory (LEMS), Oswaldo Cruz Institut, Oswaldo Cruz Foundation, Rio de Janeiro 21040-900, RJ, Brazil
| | - Carlos M. Morel
- Center for Technological Development in Health (CDTS), National Institute of Science and Technology for Innovation in Neglected Population Diseases (INCT-IDPN), Oswaldo Cruz Institut, Oswaldo Cruz Foundation, Rio de Janeiro 21040-900, RJ, Brazil; (K.R.); (G.C.L.); (D.W.P.J.); (C.M.M.)
| | - Salvatore G. De Simone
- Center for Technological Development in Health (CDTS), National Institute of Science and Technology for Innovation in Neglected Population Diseases (INCT-IDPN), Oswaldo Cruz Institut, Oswaldo Cruz Foundation, Rio de Janeiro 21040-900, RJ, Brazil; (K.R.); (G.C.L.); (D.W.P.J.); (C.M.M.)
- Epidemiology and Molecular Systematics Laboratory (LEMS), Oswaldo Cruz Institut, Oswaldo Cruz Foundation, Rio de Janeiro 21040-900, RJ, Brazil
- Program of Post-Graduation on Science and Biotechnology, Department of Molecular and Cellular Biology, Biology Institute, Federal Fluminense University, Niterói 22040-036, RJ, Brazil
- Program of Post-Graduation on Parasitic Biology, Oswaldo Cruz Institute, Oswaldo Cruz Foundation, Rio de Janeiro 21040-900, RJ, Brazil
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Khoshbakht R, Panahi S, Neshani A, Ghavidel M, Ghazvini K. Novel approaches to overcome Colistin resistance in Acinetobacter baumannii: Exploring quorum quenching as a potential solution. Microb Pathog 2023; 182:106264. [PMID: 37474078 DOI: 10.1016/j.micpath.2023.106264] [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: 06/28/2023] [Revised: 07/17/2023] [Accepted: 07/18/2023] [Indexed: 07/22/2023]
Abstract
Acinetobacter baumannii is responsible for a variety of infections, such as nosocomial infections. In recent years, this pathogen has gained resistance to many antibiotics, and thus, carbapenems were used to treat infections with MDR A. baumannii strains in clinical settings. However, as carbapenem-resistant isolates are becoming increasingly prevalent, Colistin is now used as the last line of defense against resistant A. baumannii strains. Unfortunately, reports are increasing on the presence of Colistin-resistant phenotypes in infections caused by A. baumannii, creating an urgent need to find a substitute way to combat these resistant isolates. Quorum sensing inhibition, also known as quorum quenching, is an efficient alternative way of reversing resistance in different Gram-negative bacteria. Quorum sensing is a mechanism used by bacteria to communicate with each other by secreting signal molecules. When the population of bacteria increases and the concentration of signal molecules reaches a certain threshold, bacteria can implement mechanisms to adapt to a hostile environment, such as biofilm formation. Biofilms have many advantages for pathogens, such as antibiotic resistance. Different studies have revealed that disrupting the biofilm of A. baumannii makes it more susceptible to antibiotics. Although very few studies have been conducted on the biofilm disruption through quorum quenching in Colistin-resistant A. baumannii, these studies and similar studies bring hope in finding an alternative way of treating the Colistin-resistant isolates. In conclusion, quorum quenching has the potential to be used against Colistin-resistant A. baumannii.
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Affiliation(s)
- Reza Khoshbakht
- Department of Laboratory Sciences, School of Paramedical Sciences, Mashhad University of Medical Sciences, Mashhad, Iran; Student Research Committee, Mashhad University of Medical Sciences, Mashhad, Iran.
| | - Susan Panahi
- Department of Microbiology, School of Medicine, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Alireza Neshani
- Department of Laboratory Sciences, School of Paramedical Sciences, Mashhad University of Medical Sciences, Mashhad, Iran; Student Research Committee, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Mahdis Ghavidel
- Shahid Hasheminejad Hospital, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Kiarash Ghazvini
- Antimicrobial Resistance Research Center, Mashhad University of Medical Sciences, Mashhad, Iran; Department of Microbiology and Virology, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran.
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Morici P, Rizzato C, Ghelardi E, Rossolini GM, Lupetti A. Sensitization of KPC and NDM Klebsiella pneumoniae To Rifampicin by the Human Lactoferrin-Derived Peptide hLF1-11. Microbiol Spectr 2023; 11:e0276722. [PMID: 36537823 PMCID: PMC9927577 DOI: 10.1128/spectrum.02767-22] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
A synergistic effect of non-bactericidal concentrations of the human lactoferrin (hLF)-derived peptide hLF1-11 and rifampicin against multidrug-resistant KPC (Klebsiella pneumoniae carbapenemase)-producing K. pneumoniae has been previously shown. The present study focuses on the mechanism(s) underlying this synergistic effect. The contribution of hLF1-11 and rifampicin to the synergistic effect was evaluated by killing assays with KPC K. pneumoniae cells incubated with hLF1-11 and, after washing, with rifampicin, or vice versa. Cell membrane permeability and polarization upon exposure to hLF1-11 and/or rifampicin were evaluated by ethidium bromide (EtBr) and DiBAC4(3) (bis-1,3-dibutylbarbituric acid trimethine oxonol) permeability, respectively. The effect of carbonyl cyanide m-chlorophenyl hydrazone (CCCP), an uncoupler of oxidative phosphorylation, was also evaluated. KPC K. pneumoniae cells were effectively killed after prior exposure to rifampicin for 30 to 60 min followed by treatment with hLF1-11, while no antibacterial activity was observed when cells were incubated with hLF1-11 first and then with rifampicin. EtBr accumulation increased upon exposure to hLF1-11 or the combination of hLF1-11 and rifampicin, but not upon exposure to rifampicin alone. Moreover, hLF1-11 induced a dose-dependent membrane depolarization. As expected, the antibacterial activity of hLF1-11 alone or combined with rifampicin was significantly reduced in the presence of CCCP. Furthermore, hLF1-11 and rifampicin were synergistic also against a colistin-resistant NDM (New Delhi metallo-β-lactamase)-producing K. pneumoniae strain. The results suggest that rifampicin was accumulated by KPC cells during the 30-to-60-min incubation and that the addition of hLF1-11 sensitized bacterial cells to rifampicin by inducing a transient loss of membrane potential and increased cell membrane permeability, thus facilitating the entrance and retention of rifampicin into the cytoplasm. IMPORTANCE The present study describes a synergistic effect between rifampicin, an impermeable hydrophobic antibiotic with an intracellular target, and an hLF1-11, an antimicrobial peptide derived from human lactoferrin, against multidrug-resistant Klebsiella pneumoniae. Carbapenem-resistant K. pneumoniae has recently caused an outbreak in Tuscany, Italy, thus pressing the need for the development of new treatment options. The mechanisms underlying such a synergistic effect have been studied. The results suggest that the synergistic effect was due to the transient loss of membrane potential induced by hLF1-11 and the subsequent increase in cell membrane permeability which allowed rifampicin to enter the bacterial cell. Therefore, it is likely that a sub-inhibitory concentration of hLF1-11 can efficiently permeabilize K. pneumoniae cells to rifampicin, allowing the antibiotic to reach its intracellular target. These results encourage further exploration of possible applications of this synergistic combination in the treatment of K. pneumoniae infections.
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Affiliation(s)
- Paola Morici
- Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, Pisa, Italy
| | - Cosmeri Rizzato
- Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, Pisa, Italy
| | - Emilia Ghelardi
- Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, Pisa, Italy
| | - Gian Maria Rossolini
- Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy
- Clinical Microbiology and Virology Unit, Florence Careggi University Hospital, Florence, Italy
| | - Antonella Lupetti
- Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, Pisa, Italy
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Peng J, Wang Y, Wu Z, Mao C, Li L, Cao H, Qiu Z, Guo G, Liang G, Shen F. Antimicrobial Peptide Cec4 Eradicates Multidrug-Resistant Acinetobacter baumannii in vitro and in vivo. Drug Des Devel Ther 2023; 17:977-992. [PMID: 37020803 PMCID: PMC10069437 DOI: 10.2147/dddt.s405579] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Accepted: 03/22/2023] [Indexed: 04/07/2023] Open
Abstract
Introduction Acinetobacter baumannii has become a major difficulty in the treatment of bacteria-associated infection. The previously reported antimicrobial peptide Cec4 exhibited good and stable activity against A. baumannii in vitro, but the mechanisms and effects in vivo are elusive. Methods The effects of Cec4 on bacterial membrane permeability, membrane potential and bacterial reactive oxygen species were measured. The cell membrane localization of antimicrobial peptides was studied by fluorescence labelling. The ability of bacteria to develop resistance to antimicrobial peptides was studied by continuous induction, and transcriptome difference was analysed. The in vivo toxicity of Cec4 against nematodes and mice was studied, and the in vivo therapeutic potential of Cec4 against A. baumannii was assessed. Results Cec4 effectively cleared multidrug-resistant A. baumannii by altering bacterial cell membrane permeability, changing bacterial cell membrane polarity, and increasing bacterial intracellular reactive oxygen species. Cec4 affected the expression of the secretion system, outer membrane, and efflux pump genes of A. baumannii. In addition, the bacteria did not acquire stable drug-resistant ability. Cec4 at 1.024 mg/mL did not affect the proliferation of HeLa and HepG2 cells, and Cec4 at 45 mg/kg had little effect on the mortality of Caenorhabditis elegans, even the liver and kidney tissues of mouse. Most importantly, Cec4 could effectively improve the survival rates and reduce the bacterial load of various tissues in the mouse model of infection. Conclusion In conclusion, Cec4 can damage the cell membrane of bacteria, and the bacteria is not easy to produce resistance to Cec4. Besides, Cec4 has good potential for the treatment of multidrug-resistant A. baumannii infections.
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Affiliation(s)
- Jian Peng
- Department of Intensive Care Unit, Affiliated Hospital of Guizhou Medical University, Guiyang, Guizhou, 550009, People’s Republic of China
- Guizhou Institute of Precision Medicine, Affiliated Hospital of Guizhou Medical University, Guiyang, Guizhou, 550009, People’s Republic of China
- Key Laboratory of Infectious Immune and Antibody Engineering of Guizhou Province, Cellular Immunotherapy Engineering Research Center of Guizhou Province, School of Biology and Engineering/School of Basic Medical Sciences, Guizhou Medical University, Guiyang, Guizhou, 550025, People’s Republic of China
| | - Yue Wang
- Key Laboratory of Infectious Immune and Antibody Engineering of Guizhou Province, Cellular Immunotherapy Engineering Research Center of Guizhou Province, School of Biology and Engineering/School of Basic Medical Sciences, Guizhou Medical University, Guiyang, Guizhou, 550025, People’s Republic of China
| | - Zhaoyin Wu
- Key Laboratory of Infectious Immune and Antibody Engineering of Guizhou Province, Cellular Immunotherapy Engineering Research Center of Guizhou Province, School of Biology and Engineering/School of Basic Medical Sciences, Guizhou Medical University, Guiyang, Guizhou, 550025, People’s Republic of China
| | - Chengju Mao
- Key Laboratory of Infectious Immune and Antibody Engineering of Guizhou Province, Cellular Immunotherapy Engineering Research Center of Guizhou Province, School of Biology and Engineering/School of Basic Medical Sciences, Guizhou Medical University, Guiyang, Guizhou, 550025, People’s Republic of China
| | - Lu Li
- Department of Intensive Care Unit, Affiliated Hospital of Guizhou Medical University, Guiyang, Guizhou, 550009, People’s Republic of China
- Guizhou Institute of Precision Medicine, Affiliated Hospital of Guizhou Medical University, Guiyang, Guizhou, 550009, People’s Republic of China
| | - Huijun Cao
- Department of Cardiac Surgery, the affiliated Hospital of Guizhou Medical University, Guiyang, Guizhou, 550009, People’s Republic of China
| | - Zhilang Qiu
- Key Laboratory of Infectious Immune and Antibody Engineering of Guizhou Province, Cellular Immunotherapy Engineering Research Center of Guizhou Province, School of Biology and Engineering/School of Basic Medical Sciences, Guizhou Medical University, Guiyang, Guizhou, 550025, People’s Republic of China
| | - Guo Guo
- Key Laboratory of Infectious Immune and Antibody Engineering of Guizhou Province, Cellular Immunotherapy Engineering Research Center of Guizhou Province, School of Biology and Engineering/School of Basic Medical Sciences, Guizhou Medical University, Guiyang, Guizhou, 550025, People’s Republic of China
- Translational Medicine Research Center, Guizhou Medical University, Guiyang, Guizhou, 550025, People’s Republic of China
| | - Guiyou Liang
- Department of Cardiac Surgery, the affiliated Hospital of Guizhou Medical University, Guiyang, Guizhou, 550009, People’s Republic of China
- Translational Medicine Research Center, Guizhou Medical University, Guiyang, Guizhou, 550025, People’s Republic of China
| | - Feng Shen
- Department of Intensive Care Unit, Affiliated Hospital of Guizhou Medical University, Guiyang, Guizhou, 550009, People’s Republic of China
- Guizhou Institute of Precision Medicine, Affiliated Hospital of Guizhou Medical University, Guiyang, Guizhou, 550009, People’s Republic of China
- Correspondence: Feng Shen; Guiyou Liang, Email ;
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de Santana CJC, Pires Júnior OR, Fontes W, Palma MS, Castro MS. Mastoparans: A Group of Multifunctional α-Helical Peptides With Promising Therapeutic Properties. Front Mol Biosci 2022; 9:824989. [PMID: 35813822 PMCID: PMC9263278 DOI: 10.3389/fmolb.2022.824989] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Accepted: 03/15/2022] [Indexed: 11/13/2022] Open
Abstract
Biologically active peptides have been attracting increasing attention, whether to improve the understanding of their mechanisms of action or in the search for new therapeutic drugs. Wasp venoms have been explored as a remarkable source for these molecules. In this review, the main findings on the group of wasp linear cationic α-helical peptides called mastoparans were discussed. These compounds have a wide variety of biological effects, including mast cell degranulation, activation of protein G, phospholipase A2, C, and D activation, serotonin and insulin release, and antimicrobial, hemolytic, and anticancer activities, which could lead to the development of new therapeutic agents.
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Affiliation(s)
- Carlos José Correia de Santana
- Laboratory of Toxinology, Department of Physiological Sciences, Institute of Biological Sciences, University of Brasília, Brasília, Brazil
- Laboratory of Protein Chemistry and Biochemistry, Department of Cell Biology, Institute of Biological Sciences, University of Brasília, Brasília, Brazil
| | - Osmindo Rodrigues Pires Júnior
- Laboratory of Toxinology, Department of Physiological Sciences, Institute of Biological Sciences, University of Brasília, Brasília, Brazil
| | - Wagner Fontes
- Laboratory of Protein Chemistry and Biochemistry, Department of Cell Biology, Institute of Biological Sciences, University of Brasília, Brasília, Brazil
| | - Mário Sérgio Palma
- Department of Basic and Applied Biology, Institute of Biosciences of Rio Claro, São Paulo State University, UNESP, Rio Claro, Brazil
| | - Mariana S. Castro
- Laboratory of Toxinology, Department of Physiological Sciences, Institute of Biological Sciences, University of Brasília, Brasília, Brazil
- Laboratory of Protein Chemistry and Biochemistry, Department of Cell Biology, Institute of Biological Sciences, University of Brasília, Brasília, Brazil
- *Correspondence: Mariana S. Castro,
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Lynch JP, Clark NM, Zhanel GG. Infections Due to Acinetobacter baumannii-calcoaceticus Complex: Escalation of Antimicrobial Resistance and Evolving Treatment Options. Semin Respir Crit Care Med 2022; 43:97-124. [PMID: 35172361 DOI: 10.1055/s-0041-1741019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Bacteria within the genus Acinetobacter (principally A. baumannii-calcoaceticus complex [ABC]) are gram-negative coccobacilli that most often cause infections in nosocomial settings. Community-acquired infections are rare, but may occur in patients with comorbidities, advanced age, diabetes mellitus, chronic lung or renal disease, malignancy, or impaired immunity. Most common sites of infections include blood stream, skin/soft-tissue/surgical wounds, ventilator-associated pneumonia, orthopaedic or neurosurgical procedures, and urinary tract. Acinetobacter species are intrinsically resistant to multiple antimicrobials, and have a remarkable ability to acquire new resistance determinants via plasmids, transposons, integrons, and resistance islands. Since the 1990s, antimicrobial resistance (AMR) has escalated dramatically among ABC. Global spread of multidrug-resistant (MDR)-ABC strains reflects dissemination of a few clones between hospitals, geographic regions, and continents; excessive antibiotic use amplifies this spread. Many isolates are resistant to all antimicrobials except colistimethate sodium and tetracyclines (minocycline or tigecycline); some infections are untreatable with existing antimicrobial agents. AMR poses a serious threat to effectively treat or prevent ABC infections. Strategies to curtail environmental colonization with MDR-ABC require aggressive infection-control efforts and cohorting of infected patients. Thoughtful antibiotic strategies are essential to limit the spread of MDR-ABC. Optimal therapy will likely require combination antimicrobial therapy with existing antibiotics as well as development of novel antibiotic classes.
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Affiliation(s)
- Joseph P Lynch
- Division of Pulmonary, Critical Care Medicine, Allergy, and Clinical Immunology; Department of Medicine; The David Geffen School of Medicine at UCLA, Los Angeles, California
| | - Nina M Clark
- Division of Infectious Diseases, Department of Medicine, Loyola University Medical Center, Maywood, Illinois
| | - George G Zhanel
- Department of Medical Microbiology/Infectious Diseases, University of Manitoba, Max Rady College of Medicine, Winnipeg, Manitoba, Canada
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The Antimicrobial Peptide Esc(1-21) Synergizes with Colistin in Inhibiting the Growth and in Killing Multidrug Resistant Acinetobacter baumannii Strains. Antibiotics (Basel) 2022; 11:antibiotics11020234. [PMID: 35203836 PMCID: PMC8868345 DOI: 10.3390/antibiotics11020234] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Revised: 02/04/2022] [Accepted: 02/08/2022] [Indexed: 02/01/2023] Open
Abstract
Multidrug-resistant microbial infections and the scarce availability of new antibiotics capable of eradicating them are posing a serious problem to global health security. Among the microorganisms that easily acquire resistance to antibiotics and that are the etiological cause of severe infections, there is Acinetobacter baumannii. Carbapenems are the principal agents used to treat A. baumannii infections. However, when strains develop resistance to this class of antibiotics, colistin is considered one of the last-resort drugs. However, the appearance of resistance to colistin also makes treatment of the Acinetobacter infections very difficult. Antimicrobial peptides (AMP) from the innate immunity hold promise as new alternative antibiotics due to their multiple biological properties. In this study, we characterized the activity and the membrane-perturbing mechanism of bactericidal action of a derivative of a frog-skin AMP, namely Esc(1-21), when used alone or in combination with colistin against multidrug-resistant A. baumannii clinical isolates. We found that the mixture of the two compounds had a synergistic effect in inhibiting the growth and killing of all of the tested strains. When combined at dosages below the minimal inhibitory concentration, the two drugs were also able to slow down the microbial growth and to potentiate the membrane-perturbing effect. To the best of our knowledge, this is the first report showing a synergistic effect between AMPs, i.e., Esc(1-21), and colistin against colistin-resistant A. baumannii clinical isolates, highlighting the potential clinical application of such combinational therapy.
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Wester A, Björkling F, Franzyk H. Evaluation of 1 H-Triazole-1-[ N, N'-Bis( tert-butoxycarbonyl)]carboxamidine in Solution-Phase and On-Resin Guanidinylation. J Org Chem 2021; 86:14371-14380. [PMID: 34661410 DOI: 10.1021/acs.joc.1c00994] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Several guanidines and guanidinylated peptides have substantial potential as therapeutics, but efficient guanidinylation reagents are vital for easy access to these compounds. Presently, pyrazole-1-carboxamidine type reagents are commonly used in the transformations of amines into corresponding guanidines. Here, we report a comparative study of the utility of 1H-triazole-1-[N,N'-bis(tert-butoxycarbonyl)]carboxamidine, which was synthesized in two steps and readily upscaled to gram amounts. It exhibited excellent performance in solution-phase reactions, rapidly converting a set of representative aliphatic primary and unhindered secondary amines as well as aniline into the corresponding bis(tert-butoxycarbonyl)-protected guanidines. To enable a direct assessment of the reactivity of guanidinylation reagents, conversions were performed in deuterated solvents (d7-DMF or d8-THF), allowing for continuous analysis of the reaction mixtures by 1H and 13C NMR. Likewise, 1H-triazole-1-[N,N'-bis(tert-butoxycarbonyl)]carboxamidine proved to be a versatile reagent in solid-phase conversions, for example, a resin-bound test peptide (KFFKFFK) was fully guanidinylated in only 2 h by using 2 equivalents of the reagent per free amino group. Also, 1H-triazole-1-[N,N'-bis(tert-butoxycarbonyl)]carboxamidine proved capable of completely guanidinylating more sterically hindered N-terminal residues (e.g., N-methyl amino acids or a peptoid) in resin-bound peptides. Its superior reactivity and stability demonstrated under heating conditions make 1H-triazole-1-[N,N'-bis(tert-butoxycarbonyl)]carboxamidine a valuable guanidinylation reagent both in solution- and solid-phase synthesis.
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Affiliation(s)
- Anita Wester
- Center for Peptide-Based Antibiotics, Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Jagtvej 162, DK-2100 Copenhagen East, Denmark
| | - Fredrik Björkling
- Center for Peptide-Based Antibiotics, Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Jagtvej 162, DK-2100 Copenhagen East, Denmark
| | - Henrik Franzyk
- Center for Peptide-Based Antibiotics, Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Jagtvej 162, DK-2100 Copenhagen East, Denmark
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Askari P, Namaei MH, Ghazvini K, Hosseini M. In vitro and in vivo toxicity and antibacterial efficacy of melittin against clinical extensively drug-resistant bacteria. BMC Pharmacol Toxicol 2021; 22:42. [PMID: 34261542 PMCID: PMC8281584 DOI: 10.1186/s40360-021-00503-z] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2021] [Accepted: 05/21/2021] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Melittin is one of the most studied antimicrobial peptides, and several in vitro experiments have demonstrated its antibacterial efficacy. However, there is evidence showing melittin has non-promising effects such as cytotoxicity and hemolysis. Therefore, concerns about unwanted collateral toxicity of melittin lie ahead in the path toward its clinical development. With these considerations, the present study aimed to fill the gap between in vitro and in vivo studies. METHODS In the first step, in vitro toxicity profile of melittin was assessed using cytotoxicity and hemolysis tests. Next, a maximum intraperitoneal (i.p.) sub-lethal dose was determined using BALB/c mice. Besides toxicity, antimicrobial efficacy of melittin against extensively drug-resistant (XDR) Acinetobacter baumannii, methicillin-resistant Staphylococcus aureus (MRSA), and KPC-producing Klebsiella pneumonia (KPC-KP) pathogens were tested using both in vitro and in vivo methods. RESULTS Melittin showed extensive hemolysis (HD50 = 0.44 µg/mL), and cytotoxicity (IC50 = 6.45 µg/mL) activities with i.p. LD50 value of 4.98 mg/kg in BALB/c mice. In vitro antimicrobial evaluation showed melittin MIC range from 8 to 32 µg/mL for the studied pathogens. Treatment of infected mice with repeated sub-lethal doses of melittin (2.4 mg/kg) displayed no beneficial effect on their survival and peritoneal bacterial loads. CONCLUSIONS These results indicate that melittin at its safe dose could not exhibit antimicrobial activity, which hinders its application in clinical practice.
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Affiliation(s)
- Parvin Askari
- Department of Microbiology and Virology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Mohammad Hasan Namaei
- Infectious Diseases Research Center, Birjand University of Medical Sciences, Mashhad, Iran
| | - Kiarash Ghazvini
- Department of Microbiology and Virology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran.
- Antimicrobial Resistance Research Center, Mashhad University of Medical Sciences, Mashhad, Iran.
| | - Mehran Hosseini
- Department of Anatomical Sciences, Faculty of Medicine, Birjand University of Medical Sciences, Birjand, Iran.
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Alfei S, Caviglia D, Piatti G, Zuccari G, Schito AM. Bactericidal Activity of a Self-Biodegradable Lysine-Containing Dendrimer against Clinical Isolates of Acinetobacter Genus. Int J Mol Sci 2021; 22:7274. [PMID: 34298891 PMCID: PMC8306826 DOI: 10.3390/ijms22147274] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2021] [Revised: 07/03/2021] [Accepted: 07/05/2021] [Indexed: 12/19/2022] Open
Abstract
The genus Acinetobacter consists of Gram-negative obligate aerobic pathogens, including clinically relevant species, such as A. baumannii, which frequently cause hospital infections, affecting debilitated patients. The growing resistance to antimicrobial therapies shown by A. baumannii is reaching unacceptable levels in clinical practice, and there is growing concern that the serious conditions it causes may soon become incurable. New therapeutic possibilities are, therefore, urgently needed to circumvent this important problem. Synthetic cationic macromolecules, such as cationic antimicrobial peptides (AMPs), which act as membrane disrupters, could find application in these conditions. A lysine-modified cationic polyester-based dendrimer (G5-PDK), capable of electrostatically interacting with bacterial surfaces as AMPs do, has been synthesized and characterized here. Given its chemical structure, similar to that of a fifth-generation lysine containing dendrimer (G5K) with a different core, and previously found inactive against Gram-positive bacterial species and Enterobacteriaceae, the new G5-PDK was also ineffective on the species mentioned above. In contrast, it showed minimum inhibitory concentration values (MICs) lower than reported for several AMPs and other synthetic cationic compounds on Acinetobacter genus (3.2-12.7 µM). Time-kill experiments on A. baumannii, A. pittii, and A. ursingii ascertained the rapid bactericidal effects of G5-PDK, while subsequent bacterial regrowth supported its self-biodegradability.
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Affiliation(s)
- Silvana Alfei
- Department of Pharmacy, University of Genoa, Viale Cembrano, 16148 Genoa, Italy;
| | - Debora Caviglia
- Department of Surgical Sciences and Integrated Diagnostics (DISC), University of Genoa, Viale Benedetto XV, 6, 16132 Genova, Italy; (D.C.); (G.P.); (A.M.S.)
| | - Gabriella Piatti
- Department of Surgical Sciences and Integrated Diagnostics (DISC), University of Genoa, Viale Benedetto XV, 6, 16132 Genova, Italy; (D.C.); (G.P.); (A.M.S.)
| | - Guendalina Zuccari
- Department of Pharmacy, University of Genoa, Viale Cembrano, 16148 Genoa, Italy;
| | - Anna Maria Schito
- Department of Surgical Sciences and Integrated Diagnostics (DISC), University of Genoa, Viale Benedetto XV, 6, 16132 Genova, Italy; (D.C.); (G.P.); (A.M.S.)
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Hassan A, Ikram A, Raza A, Saeed S, Zafar Paracha R, Younas Z, Khadim MT. Therapeutic Potential of Novel Mastoparan-Chitosan Nanoconstructs Against Clinical MDR Acinetobacter baumannii: In silico, in vitro and in vivo Studies. Int J Nanomedicine 2021; 16:3755-3773. [PMID: 34103914 PMCID: PMC8179793 DOI: 10.2147/ijn.s296717] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2020] [Accepted: 03/27/2021] [Indexed: 11/23/2022] Open
Abstract
PURPOSE Acinetobacter baumannii antibiotic resistant infections in high-risk patients are a great challenge for researchers and clinicians worldwide. In an effort to achieve potent bactericidal outcomes, a novel chitosan-mastoparan nanoconstruct (Mast-Cs NC) was designed and assessed for its therapeutic potential through in silico, in vitro and in vivo experimentation against clinical multidrug-resistant (MDR) A. baumannii. METHODS Optimized 3D structures of mastoparan and chitosan were coupled computationally through an ionic cross-linker to generate a circular ring of chitosan encasing mastoparan. The complex was assessed for interactions and stability through molecular dynamic simulation (MDS). Binding pocket analysis was used to assess the protease-peptide interface. Mast-Cs NC were prepared by the ionic gelation method. Mast-Cs NC were evaluated in vitro and in vivo for their therapeutic efficacy against drug-resistant clinical A. baumannii. RESULTS MDS for 100 ns showed stable bonds between chitosan and mastoparan; the first at chitosan oxygen atom-46 and mastoparan isoleucine carbon atom with a distance of 2.77 Å, and the second between oxygen atom-23 and mastoparan lysine nitrogen atom with a distance of 2.80 Å, and binding energies of -3.6 and -7.4 kcal/mol, respectively. Mast-Cs complexes approximately 156 nm in size, with +54.9 mV zeta potential and 22.63% loading capacity, offered >90% encapsulation efficiency and were found to be geometrically incompatible with binding pockets of various proteases. The MIC90 of Mast-Cs NC was significantly lower than that of chitosan (4 vs 512 μg/mL, respectively, p<0.05), with noticeable bacterial damage upon morphological analysis. In a BALB/c mouse sepsis model, a significant reduction in bacterial colony count in the Mast-Cs treated group was observed compared with chitosan and mastoparan alone (p<0.005). Mast-Cs maintained good biocompatibility and cytocompatibility. CONCLUSION Novel mastoparan-loaded chitosan nanoconstructs signify a successful strategy for achieving a synergistic bactericidal effect and higher therapeutic efficacy against MDR clinical A. baumannii isolates. The Mast-Cs nano-drug delivery system could work as an alternative promising treatment option against MDR A. baumannii.
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Affiliation(s)
- Afreenish Hassan
- Department of Microbiology, Armed Forces Institute of Pathology, National University of Medical Sciences, Rawalpindi, Pakistan
| | - Aamer Ikram
- Department of Microbiology, Armed Forces Institute of Pathology, National University of Medical Sciences, Rawalpindi, Pakistan
| | - Abida Raza
- NILOP Nanomedicine Research Laboratories, National Institute of Lasers and Optronics College, Pakistan Institute of Engineering and Applied Sciences, Islamabad, Pakistan
| | - Sidra Saeed
- NILOP Nanomedicine Research Laboratories, National Institute of Lasers and Optronics College, Pakistan Institute of Engineering and Applied Sciences, Islamabad, Pakistan
| | | | - Zumara Younas
- Department of Microbiology, Armed Forces Institute of Pathology, National University of Medical Sciences, Rawalpindi, Pakistan
| | - Muhammad Tahir Khadim
- Department of Microbiology, Armed Forces Institute of Pathology, National University of Medical Sciences, Rawalpindi, Pakistan
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Identification of potential therapeutic antimicrobial peptides against Acinetobacter baumannii in a mouse model of pneumonia. Sci Rep 2021; 11:7318. [PMID: 33795739 PMCID: PMC8016998 DOI: 10.1038/s41598-021-86844-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Accepted: 03/18/2021] [Indexed: 12/25/2022] Open
Abstract
Acinetobacter baumannii-induced nosocomial pneumonia has become a serious clinical problem because of high antibiotic resistance rates. Antimicrobial peptides (AMP) are an ideal alternative strategy due to their broad-spectrum of antimicrobial activity and low incidence of bacterial resistance. However, their application is limited by toxicity and stability in vivo. The present study used a mouse model to directly identify potential AMPs effective for treatment of A. baumannii-induced pneumonia. Fifty-eight AMPs were screened and two identified (SMAP-29 and TP4) to have prophylactic effects which prevented the death of mice with pneumonia. Furthermore, two TP4 derivatives (dN4 and dC4) were found to have therapeutic activity in pneumonia mouse models by peritoneal or intravenous administration. Both dN4 and dC4 also inhibited and/or eliminated A. baumannii biofilms at higher doses. Taken together, these data suggest the AMP derivatives dN4 and dC4 represent a potential treatment strategy for A. baumannii-induced pneumonia.
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Wasp Venom Biochemical Components and Their Potential in Biological Applications and Nanotechnological Interventions. Toxins (Basel) 2021; 13:toxins13030206. [PMID: 33809401 PMCID: PMC8000949 DOI: 10.3390/toxins13030206] [Citation(s) in RCA: 39] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2021] [Revised: 02/26/2021] [Accepted: 03/08/2021] [Indexed: 12/23/2022] Open
Abstract
Wasps, members of the order Hymenoptera, are distributed in different parts of the world, including Brazil, Thailand, Japan, Korea, and Argentina. The lifestyles of the wasps are solitary and social. Social wasps use venom as a defensive measure to protect their colonies, whereas solitary wasps use their venom to capture prey. Chemically, wasp venom possesses a wide variety of enzymes, proteins, peptides, volatile compounds, and bioactive constituents, which include phospholipase A2, antigen 5, mastoparan, and decoralin. The bioactive constituents have anticancer, antimicrobial, and anti-inflammatory effects. However, the limited quantities of wasp venom and the scarcity of advanced strategies for the synthesis of wasp venom’s bioactive compounds remain a challenge facing the effective usage of wasp venom. Solid-phase peptide synthesis is currently used to prepare wasp venom peptides and their analogs such as mastoparan, anoplin, decoralin, polybia-CP, and polydim-I. The goal of the current review is to highlight the medicinal value of the wasp venom compounds, as well as limitations and possibilities. Wasp venom could be a potential and novel natural source to develop innovative pharmaceuticals and new agents for drug discovery.
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Antimicrobial Peptides Grafted onto a Plasma Polymer Interlayer Platform: Performance upon Extended Bacterial Challenge. COATINGS 2021. [DOI: 10.3390/coatings11010068] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
To combat infections on biomedical devices, antimicrobial coatings have attracted considerable attention, including coatings comprising naturally occurring antimicrobial peptides (AMPs). In this study the aim was to explore performance upon extended challenge by bacteria growing in media above samples. The AMPs LL37, Magainin 2, and Parasin 1 were selected on the basis of well-known membrane disruption activity in solution and were covalently grafted onto a plasma polymer platform, which enables application of this multilayer coating strategy to a wide range of biomaterials. Detailed surface analyses were performed to verify the intended outcomes of the coating sequence. Samples were challenged by incubation in bacterial growth media for 5 and 20 h. Compared with the control plasma polymer surface, all three grafted AMP coatings showed considerable reductions in bacterial colonization even at the high bacterial challenge of initial seeding at 1 × 107 CFU, but there were increasing numbers of dead bacteria attached to the surface. All three grafted AMP coatings were found to be non-toxic to primary fibroblasts. These coatings thus could be useful to produce antibacterial surface coatings for biomaterials, though possible consequences arising from the presence of dead bacteria need to be studied further, and compared to non-fouling coatings that avoid attachment of dead bacteria.
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Liu Y, Yan Z, Chai J, Zhou J, Wang C. Antimicrobial Activity of the Antibacterial Peptide PMAP-GI24 and Its Analogs. Int J Pept Res Ther 2020. [DOI: 10.1007/s10989-020-10026-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Nelson N, Opene B, Ernst RK, Schwartz DK. Antimicrobial peptide activity is anticorrelated with lipid a leaflet affinity. PLoS One 2020; 15:e0242907. [PMID: 33253275 PMCID: PMC7703904 DOI: 10.1371/journal.pone.0242907] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2020] [Accepted: 11/12/2020] [Indexed: 11/18/2022] Open
Abstract
The activity of antimicrobial peptides (AMPs) has significant bacterial species bias, the mechanisms of which are not fully understood. We employed single-molecule tracking to measure the affinity of three different AMPs to hybrid supported bilayers composed of lipid A extracted from four different Gram negative bacteria and observed a strong empirical anticorrelation between the affinity of a particular AMP to a given lipid A layer and the activity of that AMP towards the bacterium from which that lipid A was extracted. This suggested that the species bias of AMP activity is directly related to AMP interactions with bacterial outer membranes, despite the fact that the mechanism of antimicrobial activity occurs at the inner membrane. The trend also suggested that the interactions between AMPs and the outer membrane lipid A (even in the absence of other components, such as lipopolysaccharides) capture effects that are relevant to the minimum inhibitory concentration.
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Affiliation(s)
- Nathaniel Nelson
- Department of Chemical and Biological Engineering, University of Colorado Boulder, Boulder, Colorado, United States of America
| | - Belita Opene
- Department of Microbial Pathogenesis, School of Dentistry, University of Maryland Baltimore, Baltimore, Maryland, United States of America
| | - Robert K. Ernst
- Department of Microbial Pathogenesis, School of Dentistry, University of Maryland Baltimore, Baltimore, Maryland, United States of America
| | - Daniel K. Schwartz
- Department of Chemical and Biological Engineering, University of Colorado Boulder, Boulder, Colorado, United States of America
- * E-mail:
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Lamiyan AK, Dalal R, Kumar NR. Venom peptides in association with standard drugs: a novel strategy for combating antibiotic resistance - an overview. J Venom Anim Toxins Incl Trop Dis 2020; 26:e20200001. [PMID: 32843888 PMCID: PMC7416788 DOI: 10.1590/1678-9199-jvatitd-2020-0001] [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: 02/03/2020] [Accepted: 07/08/2020] [Indexed: 01/03/2023] Open
Abstract
Development of antibiotic resistance that leads to resurgence of bacterial infections poses a threat to disease-free existence for humankind and is a challenge for the welfare of the society at large. Despite research efforts directed towards treatment of pathogens, antibiotics within new improved classes have not emerged for years, a fact largely attributable to the pharmacological necessities compelling drug development. Recent reversion to the use of natural products alone or in combination with standard drugs has opened up new vistas for alternative therapeutics. The success of this strategy is evident in the sudden interest in plant extracts as additives/synergists for treatment of maladies caused by drug-resistant bacterial strains. Animal venoms have long fascinated scientists as sources of pharmacologically active components that can be exploited for the treatment of specific ailments and should be promoted further to clinical trials. In the present review, we outline the scope and possible methods for the applications of animal venoms in combination with commercial antibiotics to offer a better treatment approach against antibiotic-resistant infections.
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Affiliation(s)
| | - Ramkesh Dalal
- Department of Zoology, Panjab University, Chandigarh, India
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El-Seedi H, Abd El-Wahed A, Yosri N, Musharraf SG, Chen L, Moustafa M, Zou X, Al-Mousawi S, Guo Z, Khatib A, Khalifa S. Antimicrobial Properties of Apis mellifera's Bee Venom. Toxins (Basel) 2020; 12:toxins12070451. [PMID: 32664544 PMCID: PMC7404974 DOI: 10.3390/toxins12070451] [Citation(s) in RCA: 49] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Revised: 07/08/2020] [Accepted: 07/09/2020] [Indexed: 12/12/2022] Open
Abstract
Bee venom (BV) is a rich source of secondary metabolites from honeybees (Apis mellifera L.). It contains a variety of bioactive ingredients including peptides, proteins, enzymes, and volatile metabolites. The compounds contribute to the venom’s observed biological functions as per its anti-inflammatory and anticancer effects. The antimicrobial action of BV has been shown in vitro and in vivo experiments against bacteria, viruses, and fungi. The synergistic therapeutic interactions of BV with antibiotics has been reported. The synergistic effect contributes to a decrease in the loading and maintenance dosage, a decrease in the side effects of chemotherapy, and a decrease in drug resistance. To our knowledge, there have been no reviews on the impact of BV and its antimicrobial constituents thus far. The purpose of this review is to address the antimicrobial properties of BV and its compounds.
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Affiliation(s)
- Hesham El-Seedi
- International Research Center for Food Nutrition and Safety, Jiangsu University, Zhenjiang 212013, China
- Department of Molecular Biosciences, The Wenner-Gren Institute, Stockholm University, S-106 91 Stockholm, Sweden
- Al-Rayan Research and Innovation Center, Al-Rayan Colleges, Medina 42541, Saudi Arabia
- Department of Chemistry, Faculty of Science, Menoufia University, Shebin El-Kom 32512, Egypt; (A.A.E.-W.); (N.Y.)
- Correspondence: (H.E.-S.); (S.K.); Tel.: +46-18-4714207 (H.E.-S.)
| | - Aida Abd El-Wahed
- Department of Chemistry, Faculty of Science, Menoufia University, Shebin El-Kom 32512, Egypt; (A.A.E.-W.); (N.Y.)
- Department of Bee Research, Plant Protection Research Institute, Agricultural Research Centre, Giza 12627, Egypt
| | - Nermeen Yosri
- Department of Chemistry, Faculty of Science, Menoufia University, Shebin El-Kom 32512, Egypt; (A.A.E.-W.); (N.Y.)
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China; (X.Z.); (Z.G.)
| | - Syed Ghulam Musharraf
- H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi 75270, Pakistan;
| | - Lei Chen
- College of Food Science, Fujian Agriculture and Forestry University, Fuzhou 350002, China;
| | - Moustafa Moustafa
- Department of Chemistry, Faculty of Science, University of Kuwait, Safat 13060, Kuwait; (M.M.); (S.A.-M.)
| | - Xiaobo Zou
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China; (X.Z.); (Z.G.)
| | - Saleh Al-Mousawi
- Department of Chemistry, Faculty of Science, University of Kuwait, Safat 13060, Kuwait; (M.M.); (S.A.-M.)
| | - Zhiming Guo
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China; (X.Z.); (Z.G.)
| | - Alfi Khatib
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, International Islamic University Malaysia, Kuantan, Pahang 25200, Malaysia;
- Faculty of Pharmacy, Airlangga University, Surabaya 60155, Indonesia
| | - Shaden Khalifa
- Department of Molecular Biosciences, The Wenner-Gren Institute, Stockholm University, S-106 91 Stockholm, Sweden
- Correspondence: (H.E.-S.); (S.K.); Tel.: +46-18-4714207 (H.E.-S.)
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Neshani A, Sedighian H, Mirhosseini SA, Ghazvini K, Zare H, Jahangiri A. Antimicrobial peptides as a promising treatment option against Acinetobacter baumannii infections. Microb Pathog 2020; 146:104238. [PMID: 32387392 DOI: 10.1016/j.micpath.2020.104238] [Citation(s) in RCA: 45] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Revised: 04/26/2020] [Accepted: 04/27/2020] [Indexed: 12/18/2022]
Abstract
BACKGROUND With the increasing rate of antibiotic resistance in Acinetobacter, the World Health Organization introduced the carbapenem-resistant isolates in the priority pathogens list for which innovative new treatments are urgently needed. Antimicrobial peptides (AMPs) are one of the antimicrobial agents with high potential to produce new anti-Acinetobacter drugs. This review aims to summarize recent advances and compare AMPs with anti-Acinetobacter baumannii activity. METHODS Active AMPs against Acinetobacter were considered, and essential features, including structure, mechanism of action, anti-A. baumannii potent, and other prominent characteristics, were investigated and compared to each other. In this regard, the Google Scholar search engine and databases of PubMed, Scopus, and Web of Science were used. RESULTS Forty-six anti-Acinetobacter peptides were identified and classified into ten groups: Cathelicidins, Defensins, Frog AMPs, Melittin, Cecropins, Mastoparan, Histatins, Dermcidins, Tachyplesins, and computationally designed AMPs. According to the Minimum Inhibitory Concentration (MIC) reports, six peptides of Melittin, Histatin-8, Omega76, AM-CATH36, Hymenochirin, and Mastoparan have the highest anti-A. baumannii power against sensitive and antibiotic-resistant isolates. All anti-Acinetobacter peptides except Dermcidin have a net positive charge. Most of these peptides have alpha-helical structure; however, β-sheet and other structures have been observed among them. The mechanism of action of these antimicrobial agents is divided into two categories of membrane-based and intracellular target-based attack. CONCLUSION Evidence from this review indicates that AMPs would be likely among the main anti-A. baumannii drugs in the post-antibiotic era. Also, the application of computer science to increase anti-A. baumannii activity and reduce toxicity could be helpful.
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Affiliation(s)
- Alireza Neshani
- Applied Microbiology Research Center, Systems Biology and Poisonings Institute, Baqiyatallah University of Medical Sciences, Tehran, Iran; Department of Laboratory Sciences, School of Paramedical Sciences, Mashhad University of Medical Sciences, Mashhad, Iran; Antimicrobial Resistance Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Hamid Sedighian
- Applied Microbiology Research Center, Systems Biology and Poisonings Institute, Baqiyatallah University of Medical Sciences, Tehran, Iran
| | - Seyed Ali Mirhosseini
- Applied Microbiology Research Center, Systems Biology and Poisonings Institute, Baqiyatallah University of Medical Sciences, Tehran, Iran
| | - Kiarash Ghazvini
- Antimicrobial Resistance Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Hosna Zare
- Antimicrobial Resistance Research Center, Mashhad University of Medical Sciences, Mashhad, Iran; Student Research Committee, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Abolfazl Jahangiri
- Applied Microbiology Research Center, Systems Biology and Poisonings Institute, Baqiyatallah University of Medical Sciences, Tehran, Iran.
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Muchintala D, Suresh V, Raju D, Sashidhar R. Synthesis and characterization of cecropin peptide-based silver nanocomposites: Its antibacterial activity and mode of action. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2020; 110:110712. [DOI: 10.1016/j.msec.2020.110712] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2019] [Revised: 01/26/2020] [Accepted: 01/30/2020] [Indexed: 12/19/2022]
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Antimicrobial Peptides from Rat-Tailed Maggots of the Drone Fly Eristalis tenax Show Potent Activity against Multidrug-Resistant Gram-Negative Bacteria. Microorganisms 2020; 8:microorganisms8050626. [PMID: 32344933 PMCID: PMC7284870 DOI: 10.3390/microorganisms8050626] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2020] [Revised: 04/18/2020] [Accepted: 04/22/2020] [Indexed: 02/06/2023] Open
Abstract
The spread of multidrug-resistant Gram-negative bacteria is an increasing threat to human health, because novel compound classes for the development of antibiotics have not been discovered for decades. Antimicrobial peptides (AMPs) may provide a much-needed breakthrough because these immunity-related defense molecules protect many eukaryotes against Gram-negative pathogens. Recent concepts in evolutionary immunology predict the presence of potent AMPs in insects that have adapted to survive in habitats with extreme microbial contamination. For example, the saprophagous and coprophagous maggots of the drone fly Eristalis tenax (Diptera) can flourish in polluted aquatic habitats, such as sewage tanks and farmyard liquid manure storage pits. We used next-generation sequencing to screen the E. tenax immunity-related transcriptome for AMPs that are synthesized in response to the injection of bacterial lipopolysaccharide. We identified 22 AMPs and selected nine for larger-scale synthesis to test their activity against a broad spectrum of pathogens, including multidrug-resistant Gram-negative bacteria. Two cecropin-like peptides (EtCec1-a and EtCec2-a) and a diptericin-like peptide (EtDip) displayed strong activity against the pathogens, even under simulated physiological conditions, and also achieved a good therapeutic window. Therefore, these AMPs could be used as leads for the development of novel antibiotics.
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Rangel K, Curty Lechuga G, Almeida Souza AL, Rangel da Silva Carvalho JP, Simões Villas Bôas MH, De Simone SG. Pan-Drug Resistant Acinetobacter baumannii, but Not Other Strains, Are Resistant to the Bee Venom Peptide Mellitin. Antibiotics (Basel) 2020; 9:antibiotics9040178. [PMID: 32295149 PMCID: PMC7235889 DOI: 10.3390/antibiotics9040178] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2019] [Revised: 12/09/2019] [Accepted: 12/14/2019] [Indexed: 12/20/2022] Open
Abstract
Acinetobacter baumannii is a prevalent pathogen in hospital settings with increasing importance in infections associated with biofilm production. Due to a rapid increase in its drug resistance and the failure of commonly available antibiotics to treat A. baumannii infections, this bacterium has become a critical public health issue. For these multi-drug resistant A. baumannii, polymyxin antibiotics are considered the only option for the treatment of severe infections. Concerning, several polymyxin-resistant A. baumannii strains have been isolated over the last few years. This study utilized pan drug-resistant (PDR) strains of A. baumannii isolated in Brazil, along with susceptible (S) and extreme drug-resistant (XDR) strains in order to evaluate the in vitro activity of melittin, an antimicrobial peptide, in comparison to polymyxin and another antibiotic, imipenem. From a broth microdilution method, the determined minimum inhibitory concentration showed that S and XDR strains were susceptible to melittin. In contrast, PDR A. baumannii was resistant to all treatments. Treatment with the peptide was also observed to inhibit biofilm formation of a susceptible strain and appeared to cause permanent membrane damage. A subpopulation of PDR showed membrane damage, however, it was not sufficient to stop bacterial growth, suggesting that alterations involved with antibiotic resistance could also influence melittin resistance. Presumably, mutations in the PDR that have arisen to confer resistance to widely used therapeutics also confer resistance to melittin. Our results demonstrate the potential of melittin to be used in the control of bacterial infections and suggest that antimicrobial peptides can serve as the basis for the development of new treatments.
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Affiliation(s)
- Karyne Rangel
- FIOCRUZ, Center for Technological, Development in Health (CDTS)/National, Institute of Science and Technology for Innovation in Neglected Population Diseases (INCT-IDPN), Rio de Janeiro 21040-900; (G.C.L.); (A.L.A.S.); (J.P.R.d.S.C.)
- Correspondence: (K.R.); (S.G.D.S.)
| | - Guilherme Curty Lechuga
- FIOCRUZ, Center for Technological, Development in Health (CDTS)/National, Institute of Science and Technology for Innovation in Neglected Population Diseases (INCT-IDPN), Rio de Janeiro 21040-900; (G.C.L.); (A.L.A.S.); (J.P.R.d.S.C.)
- FIOCRUZ, Oswaldo Cruz Institute, Laboratory of Cellular Ultrastructure, Rio de Janeiro 21040-900, Brazil
| | - André Luis Almeida Souza
- FIOCRUZ, Center for Technological, Development in Health (CDTS)/National, Institute of Science and Technology for Innovation in Neglected Population Diseases (INCT-IDPN), Rio de Janeiro 21040-900; (G.C.L.); (A.L.A.S.); (J.P.R.d.S.C.)
| | - João Pedro Rangel da Silva Carvalho
- FIOCRUZ, Center for Technological, Development in Health (CDTS)/National, Institute of Science and Technology for Innovation in Neglected Population Diseases (INCT-IDPN), Rio de Janeiro 21040-900; (G.C.L.); (A.L.A.S.); (J.P.R.d.S.C.)
| | - Maria Helena Simões Villas Bôas
- FIOCRUZ, Microbiology Department, National Institute for Quality Control in Health (INCQS), Rio de Janeiro 21040-900, Brazil;
| | - Salvatore Giovanni De Simone
- FIOCRUZ, Center for Technological, Development in Health (CDTS)/National, Institute of Science and Technology for Innovation in Neglected Population Diseases (INCT-IDPN), Rio de Janeiro 21040-900; (G.C.L.); (A.L.A.S.); (J.P.R.d.S.C.)
- FIOCRUZ, Federal Fluminense University, Biology Institute, Department of Molecular and Cellular Biology, Rio de Janeiro, Niterói 24020-140, Brazil
- Correspondence: (K.R.); (S.G.D.S.)
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Cote CK, Blanco II, Hunter M, Shoe JL, Klimko CP, Panchal RG, Welkos SL. Combinations of early generation antibiotics and antimicrobial peptides are effective against a broad spectrum of bacterial biothreat agents. Microb Pathog 2020; 142:104050. [PMID: 32050093 DOI: 10.1016/j.micpath.2020.104050] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Revised: 02/06/2020] [Accepted: 02/07/2020] [Indexed: 10/25/2022]
Abstract
The misuse of infectious disease pathogens as agents of deliberate attack on civilians and military personnel is a serious national security concern, which is exacerbated by the emergence of natural or genetically engineered multidrug resistant strains. In this study, the therapeutic potential of combinations of an antibiotic and a broad-spectrum antimicrobial peptide (AMP) was evaluated against five bacterial biothreats, the etiologic agents of glanders (Burkholderia mallei), melioidosis (Burkholderia pseudomallei), plague (Yersinia pestis), tularemia (Francisella tularensis), and anthrax (Bacillus anthracis). The therapeutics included licensed early generation antibiotics which are now rarely used. Three antibiotics and one 24- amino acid AMP were selected based on MIC assay data. Combinations of the AMP and tigecycline, minocycline, or novobiocin were screened for synergistic activity by checkerboard MIC assay. The combinations each enhanced the susceptibility of several strains. The tetracycline-peptide combinations increased the sensitivities of Y. pestis, F. tularensis, B. anthracis and B. pseudomallei, and the novobiocin-AMP combination augmented the sensitivity of all five. In time-kill assays, down-selected combinations of the peptide and minocycline or tigecycline enhanced killing of B. anthracis, Y. pestis, F. tularensis, and Burkholderia mallei but not B. pseudomallei. The novobiocin-AMP pair significantly reduced viability of all strains except B. mallei, which was very sensitive to the antibiotic alone. The results suggested that antibiotic-AMP combinations are useful tools for combating diverse pathogens. Future studies employing cell culture and animal models will utilize virulent strains of the agents to investigate the in vivo availability, host cytotoxicity, and protective efficacy of these therapeutics.
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Affiliation(s)
- Christopher K Cote
- Bacteriology Division, United States Army Medical Research Institute of Infectious Diseases (USAMRIID), 1425 Porter Street, Fort Detrick, Frederick, MD, 21702-5011, USA.
| | - Irma I Blanco
- Bacteriology Division, United States Army Medical Research Institute of Infectious Diseases (USAMRIID), 1425 Porter Street, Fort Detrick, Frederick, MD, 21702-5011, USA
| | - Melissa Hunter
- Bacteriology Division, United States Army Medical Research Institute of Infectious Diseases (USAMRIID), 1425 Porter Street, Fort Detrick, Frederick, MD, 21702-5011, USA
| | - Jennifer L Shoe
- Bacteriology Division, United States Army Medical Research Institute of Infectious Diseases (USAMRIID), 1425 Porter Street, Fort Detrick, Frederick, MD, 21702-5011, USA
| | - Christopher P Klimko
- Bacteriology Division, United States Army Medical Research Institute of Infectious Diseases (USAMRIID), 1425 Porter Street, Fort Detrick, Frederick, MD, 21702-5011, USA
| | | | - Susan L Welkos
- Bacteriology Division, United States Army Medical Research Institute of Infectious Diseases (USAMRIID), 1425 Porter Street, Fort Detrick, Frederick, MD, 21702-5011, USA.
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Hirsch R, Wiesner J, Marker A, Pfeifer Y, Bauer A, Hammann PE, Vilcinskas A. Profiling antimicrobial peptides from the medical maggot Lucilia sericata as potential antibiotics for MDR Gram-negative bacteria. J Antimicrob Chemother 2020; 74:96-107. [PMID: 30272195 PMCID: PMC6322280 DOI: 10.1093/jac/dky386] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2018] [Accepted: 08/24/2018] [Indexed: 12/16/2022] Open
Abstract
Background The ability of MDR Gram-negative bacteria to evade even antibiotics of last resort is a severe global challenge. The development pipeline for conventional antibiotics cannot address this issue, but antimicrobial peptides (AMPs) offer an alternative solution. Objectives Two insect-derived AMPs (LS-sarcotoxin and LS-stomoxyn) were profiled to assess their suitability for systemic application in humans. Methods The peptides were tested against an extended panel of 114 clinical MDR Gram-negative bacterial isolates followed by time–kill analysis, interaction studies and assays to determine the likelihood of emerging resistance. In further in vitro studies we addressed cytotoxicity, cardiotoxicity and off-target interactions. In addition, an in vivo tolerability and pharmacokinetic study in mice was performed. Results LS-sarcotoxin and LS-stomoxyn showed potent and selective activity against Gram-negative bacteria and no cross-resistance with carbapenems, fluoroquinolones or aminoglycosides. Peptide concentrations of 4 or 8 mg/L inhibited 90% of the clinical MDR isolates of Escherichia coli, Enterobacter cloacae, Acinetobacter baumannii and Salmonella enterica isolates tested. The ‘all-d’ homologues of the peptides displayed markedly reduced activity, indicating a chiral target. Pharmacological profiling revealed a good in vitro therapeutic index, no cytotoxicity or cardiotoxicity, an inconspicuous broad-panel off-target profile, and no acute toxicity in mice at 10 mg/kg. In mouse pharmacokinetic experiments LS-sarcotoxin and LS-stomoxyn plasma levels above the lower limit of quantification (1 and 0.25 mg/mL, respectively) were detected after 5 and 15 min, respectively. Conclusions LS-sarcotoxin and LS-stomoxyn are suitable as lead candidates for the development of novel antibiotics; however, their pharmacokinetic properties need to be improved for systemic administration.
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Affiliation(s)
- Rolf Hirsch
- Fraunhofer Institute for Molecular Biology and Applied Ecology, Department of Bioresources, Gießen, Germany
- Present address: Evotec International GmbH, Hamburg, Germany
| | - Jochen Wiesner
- Fraunhofer Institute for Molecular Biology and Applied Ecology, Department of Bioresources, Gießen, Germany
| | - Alexander Marker
- Sanofi-Aventis Deutschland GmbH, Industriepark Höchst, Frankfurt, Germany
| | - Yvonne Pfeifer
- Department 1 – Infectious Diseases, Robert Koch Institute, Wernigerode, Germany
| | - Armin Bauer
- Sanofi-Aventis Deutschland GmbH, Industriepark Höchst, Frankfurt, Germany
| | - Peter E Hammann
- Sanofi-Aventis Deutschland GmbH, Industriepark Höchst, Frankfurt, Germany
- Present address: Evotec International GmbH, Hamburg, Germany
| | - Andreas Vilcinskas
- Fraunhofer Institute for Molecular Biology and Applied Ecology, Department of Bioresources, Gießen, Germany
- Institute for Insect Biotechnology, Justus Liebig University of Gießen, Gießen, Germany
- Corresponding author. Tel: +49 641 99 39500; E-mail: orcid.org/0000-0001-8276-4968
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Computational screening of antimicrobial peptides for Acinetobacter baumannii. PLoS One 2019; 14:e0219693. [PMID: 31577808 PMCID: PMC6774513 DOI: 10.1371/journal.pone.0219693] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Accepted: 06/29/2019] [Indexed: 02/07/2023] Open
Abstract
Acinetobacter baumannii, has been developing resistance to even the last line of drugs. Antimicrobial peptides (AMPs) to which bacteria do not develop resistance easily may be the last hope. A few independent experimental studies have designed and studied the activity of AMPs on A. baumannii, however the number of such studies are still limited. With the goal of developing a rational approach to the screening of AMPs against A. baumannii, we carefully curated the drug activity data from 75 cationic AMPs, all measured with a similar protocol, and on the same ATCC 19606 strain. A quantitative model developed and validated with a part of the data. While the model may be used for predicting the activity of any designed AMPs, in this work, we perform an in silico screening for the entire database of naturally occurring AMPs, to provide a rational guidance in this urgently needed drug development.
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Morroni G, Simonetti O, Brenciani A, Brescini L, Kamysz W, Kamysz E, Neubauer D, Caffarini M, Orciani M, Giovanetti E, Offidani A, Giacometti A, Cirioni O. In vitro activity of Protegrin-1, alone and in combination with clinically useful antibiotics, against Acinetobacter baumannii strains isolated from surgical wounds. Med Microbiol Immunol 2019; 208:877-883. [PMID: 31214759 DOI: 10.1007/s00430-019-00624-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2018] [Accepted: 06/07/2019] [Indexed: 12/01/2022]
Abstract
In the past few years the increasing incidence of hospital infections with Acinetobacter baumannii, especially in immunocompromised patients, and its proneness to develop multidrug resistance have been raising considerable concern. This study examines the antimicrobial and antibiofilm activity of protegrin 1 (PG-1), an antimicrobial peptide from porcine leukocytes, against A. baumannii strains isolated from surgical wounds. PG-1 was tested both alone and combined with the antibiotics commonly used in clinical settings. Its antimicrobial activity was evaluated by determination of minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC), checkerboard assays, and time-kill experiments. Its effects on biofilm inhibition/eradication were tested with crystal violet staining. The strains were grown in subinhibitory or increasing PG-1 concentrations to test the development of resistance. Mammalian cell toxicity was tested by XTT assays. PG-1 MICs and MBCs ranged from 2 to 8 µg/ml. PG-1 was most active and demonstrated a synergistic interaction with colistin, a last resort antibiotic. Interestingly, antagonism was never observed. In time-kill experiments, incubation with 2 × MIC for 30 min suppressed all viable cells. PG-1 did not select resistant strains and showed a limited effect on cell viability, but it did exert a strong activity against multidrug-resistant A. baumannii. In contrast, in our experimental conditions it had no effect on biofilm inhibition/eradication. PG-1 thus seems to be a promising antimicrobial agent against multidrug-resistant Gram-negative infections.
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Affiliation(s)
- Gianluca Morroni
- Infectious Diseases Clinic, Department of Biomedical Sciences and Public Health, Polytechnic University of Marche, Ancona, Italy
| | - Oriana Simonetti
- Dermatological Clinic, Polytechnic University of Marche, Ancona, Italy
| | - Andrea Brenciani
- Microbiology Unit, Department of Biomedical Sciences and Public Health, Polytechnic University of Marche, Ancona, Italy.
| | - Lucia Brescini
- Infectious Diseases Clinic, Department of Biomedical Sciences and Public Health, Polytechnic University of Marche, Ancona, Italy
| | - Wojciech Kamysz
- Faculty of Pharmacy, Medical University of Gdansk, Gdańsk, Poland
| | | | - Damian Neubauer
- Faculty of Pharmacy, Medical University of Gdansk, Gdańsk, Poland
| | - Miriam Caffarini
- Histology, Department of Clinical and Molecular Sciences, Polytechnic University of Marche, Ancona, Italy
| | - Monia Orciani
- Histology, Department of Clinical and Molecular Sciences, Polytechnic University of Marche, Ancona, Italy
| | - Eleonora Giovanetti
- Microbiology Unit, Department of Life and Environmental Sciences, Polytechnic University of Marche, Ancona, Italy
| | | | - Andrea Giacometti
- Infectious Diseases Clinic, Department of Biomedical Sciences and Public Health, Polytechnic University of Marche, Ancona, Italy
| | - Oscar Cirioni
- Infectious Diseases Clinic, Department of Biomedical Sciences and Public Health, Polytechnic University of Marche, Ancona, Italy
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Single dose eradication of extensively drug resistant Acinetobacter spp. In a mouse model of burn infection by melittin antimicrobial peptide. Microb Pathog 2019; 127:60-69. [DOI: 10.1016/j.micpath.2018.11.055] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2018] [Revised: 11/29/2018] [Accepted: 11/30/2018] [Indexed: 11/23/2022]
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Portell-Buj E, Vergara A, Alejo I, López-Gavín A, Monté MR, San Nicolás L, González-Martín J, Tudó G. In vitro activity of 12 antimicrobial peptides against Mycobacterium tuberculosis and Mycobacterium avium clinical isolates. J Med Microbiol 2018; 68:211-215. [PMID: 30570475 DOI: 10.1099/jmm.0.000912] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Tuberculosis (TB) remains a major threat to human health worldwide. The increasing incidence of non-tuberculous mycobacterial infections and particularly those produced by Mycobacterium avium has emphasized the need to develop new drugs. Additionally, high levels of natural drug resistance in non-tuberculous mycobacteria (NTM) and the emergence of multidrug-resistant (MDR) TB is of great concern. Antimicrobial peptides (AMPs) are antibiotics with broad-spectrum antimicrobial activity. The objective was to assess the activity of AMPs against Mycobacterium tuberculosis and M. avium clinical isolates. MICs were determined using microtitre plates and the resazurin assay. Mastoparan and melittin showed the greatest activity against M. tuberculosis, while indolicidin had the lowest MIC against M. avium. In conclusion, AMPs could be alternatives for the treatment of mycobacterial infections. Further investigation of AMPs' activity in combination and associated with conventional antibiotics and their loading into drug-delivery systems could lead to their use in clinical practice.
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Affiliation(s)
- Elena Portell-Buj
- 1Departament de Fonaments Clínics, Facultat de Medicina i Ciències de la Salut, Universitat de Barcelona, Servei de Microbiologia-CDB, Hospital Clínic de Barcelona-ISGlobal, c/ Villarroel 170, 08036 Barcelona, Spain
| | - Andrea Vergara
- 2Servei de Microbiologia-CDB, Hospital Clínic de Barcelona-ISGlobal, Departament de Fonaments Clínics, Facultat de Medicina i Ciències de la Salut, Universitat deBarcelona, c/ Villarroel 170, 08036 Barcelona, Spain
| | - Izaskun Alejo
- 2Servei de Microbiologia-CDB, Hospital Clínic de Barcelona-ISGlobal, Departament de Fonaments Clínics, Facultat de Medicina i Ciències de la Salut, Universitat deBarcelona, c/ Villarroel 170, 08036 Barcelona, Spain.,3Servicio de Microbiología, Hospital Universitario de Cruces, Barakaldo, Bizkaia, Spain
| | - Alexandre López-Gavín
- 2Servei de Microbiologia-CDB, Hospital Clínic de Barcelona-ISGlobal, Departament de Fonaments Clínics, Facultat de Medicina i Ciències de la Salut, Universitat deBarcelona, c/ Villarroel 170, 08036 Barcelona, Spain
| | - Maria Rosa Monté
- 2Servei de Microbiologia-CDB, Hospital Clínic de Barcelona-ISGlobal, Departament de Fonaments Clínics, Facultat de Medicina i Ciències de la Salut, Universitat deBarcelona, c/ Villarroel 170, 08036 Barcelona, Spain
| | - Lorena San Nicolás
- 2Servei de Microbiologia-CDB, Hospital Clínic de Barcelona-ISGlobal, Departament de Fonaments Clínics, Facultat de Medicina i Ciències de la Salut, Universitat deBarcelona, c/ Villarroel 170, 08036 Barcelona, Spain
| | - Julian González-Martín
- 2Servei de Microbiologia-CDB, Hospital Clínic de Barcelona-ISGlobal, Departament de Fonaments Clínics, Facultat de Medicina i Ciències de la Salut, Universitat deBarcelona, c/ Villarroel 170, 08036 Barcelona, Spain
| | - Griselda Tudó
- 2Servei de Microbiologia-CDB, Hospital Clínic de Barcelona-ISGlobal, Departament de Fonaments Clínics, Facultat de Medicina i Ciències de la Salut, Universitat deBarcelona, c/ Villarroel 170, 08036 Barcelona, Spain
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Design of antimicrobial peptides from a cuttlefish database. Amino Acids 2018; 50:1573-1582. [PMID: 30121851 DOI: 10.1007/s00726-018-2633-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2018] [Accepted: 08/03/2018] [Indexed: 01/15/2023]
Abstract
No antimicrobial peptide has been identified in cephalopods to date. Annotation of transcriptomes or genomes using basic local alignment Search Tool failed to yield any from sequence identities. Therefore, we searched for antimicrobial sequences in the cuttlefish (Sepia officinalis) database by in silico analysis of a transcriptomic database. Using an original approach based on the analysis of cysteine-free antimicrobial peptides selected from our Antimicrobial Peptide Database (APD3), the online prediction tool of the Collection of Anti-Microbial Peptides (CAMPR3), and a homemade software program, we identified potential antibacterial sequences. Nine peptides less than 25 amino acids long were synthesized. The hydrophobic content of all nine of them ranged from 30 to 70%, and they could form alpha-helices. Three peptides possessed similarities with piscidins, one with BMAP-27, and five were totally new. Their antibacterial activity was evaluated on eight bacteria including the aquatic pathogens Vibrio alginolyticus, Aeromonas salmonicida, or human pathogens such as Salmonella typhimurium, Listeria monocytogenes, or Staphylococcus aureus. Despite the prediction of an antimicrobial potential for eight of the peptides, only two-GR21 and KT19-inhibited more than one bacterial strain with minimal inhibitory concentrations below 25 µM. Some sequences like VA20 and FK19 were hemolytic, while GR21 induced less than 10% of hemolysis on human blood cells at a concentration of 200 µM. GR21 was the only peptide derived from a precursor with a signal peptide, suggesting a real role in cuttlefish immune defense.
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Evaluation Synergistic Effect of TiO2, ZnO Nanoparticles and Amphiphilic Peptides (Mastoparan-B, Indolicidin) Against Drug-Resistant Pseudomonas aeruginosa, Klebsiella pneumoniae and Acinetobacter baumannii. ARCHIVES OF PEDIATRIC INFECTIOUS DISEASES 2018. [DOI: 10.5812/pedinfect.57920] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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33
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Bardbari AM, Arabestani MR, Karami M, Keramat F, Aghazadeh H, Alikhani MY, Bagheri KP. Highly synergistic activity of melittin with imipenem and colistin in biofilm inhibition against multidrug-resistant strong biofilm producer strains of Acinetobacter baumannii. Eur J Clin Microbiol Infect Dis 2018; 37:443-454. [DOI: 10.1007/s10096-018-3189-7] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2017] [Accepted: 01/08/2018] [Indexed: 01/10/2023]
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Liu C, Shan B, Qi J, Ma Y. Systemic Responses of Multidrug-Resistant Pseudomonas aeruginosa and Acinetobacter baumannii Following Exposure to the Antimicrobial Peptide Cathelicidin-BF Imply Multiple Intracellular Targets. Front Cell Infect Microbiol 2017; 7:466. [PMID: 29164074 PMCID: PMC5681922 DOI: 10.3389/fcimb.2017.00466] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2017] [Accepted: 10/20/2017] [Indexed: 12/04/2022] Open
Abstract
Cathelicidin-BF, derived from the banded krait (Bungarus fasciatus), is a typically cationic, amphiphilic and α-helical antimicrobial peptide (AMP) with 30 amino acids that exerts powerful effects on multidrug-resistant (MDR) clinical isolates, including Pseudomonas aeruginosa, Acinetobacter baumannii, and Klebsiella pneumoniae, but whether it targets plasma membranes or intracellular targets to kill bacteria is still controversial. In the present study, we demonstrated that the disruption of bacterial membranes with high concentrations of cathelicidin-BF was the cause of bacterial death, as with conventional antibiotics at high concentrations. At lower concentrations, cathelicidin-BF did not cause bacterial plasma membrane disruption, but it was able to cross the membrane and aggregate at the nucleoid regions. Functional proteins of the transcription processes of P. aeruginosa and A. baumannii were affected by sublethal doses of cathelicidin-BF, as demonstrated by comparative proteomics using isobaric tags for relative and absolute quantification and subsequent gene ontology (GO) analysis. Analysis using the Kyoto Encyclopedia of Genes and Genomes showed that cathelicidin-BF mainly interferes with metabolic pathways related to amino acid synthesis, metabolism of cofactors and vitamins, metabolism of purine and energy supply, and other processes. Although specific targets of cathelicidin-BF must still be validated, our study offers strong evidence that cathelicidin-BF may act upon intracellular targets to kill superbugs, which may be helpful for further efforts to discover novel antibiotics to fight against them.
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Affiliation(s)
- Cunbao Liu
- Laboratory of Molecular Immunology, Institute of Medical Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Kunming, China
| | - Bin Shan
- Department of Clinical Lab, The First Affiliated Hospital of Kunming Medical University, Kunming, China
| | - Jialong Qi
- Laboratory of Molecular Immunology, Institute of Medical Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Kunming, China
| | - Yanbing Ma
- Laboratory of Molecular Immunology, Institute of Medical Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Kunming, China
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Geng H, Yuan Y, Adayi A, Zhang X, Song X, Gong L, Zhang X, Gao P. Engineered chimeric peptides with antimicrobial and titanium-binding functions to inhibit biofilm formation on Ti implants. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2017; 82:141-154. [PMID: 29025642 DOI: 10.1016/j.msec.2017.08.062] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2017] [Revised: 08/16/2017] [Accepted: 08/16/2017] [Indexed: 01/08/2023]
Abstract
Titanium (Ti) implants have been commonly used in oral medicine. However, despite their widespread clinical application, these implants are susceptible to failure induced by microbial infection due to bacterial biofilm formation. Immobilization of chimeric peptides with antibacterial properties on the Ti surface may be a promising antimicrobial approach to inhibit biofilm formation. Here, chimeric peptides were designed by connecting three sequences (hBD-3-1/2/3) derived from human β-defensin-3 (hBD-3) with Ti-binding peptide-l (TBP-l: RKLPDAGPMHTW) via a triple glycine (G) linker to modify Ti surfaces. Using X-ray photoelectron spectroscopy (XPS), the properties of individual domains of the chimeric peptides were evaluated for their binding activity toward the Ti surface. The antimicrobial and anti-biofilm efficacy of the peptides against initial settlers, Streptococcus oralis (S. oralis), Streptococcus gordonii (S. gordonii) and Streptococcus sanguinis (S. sanguinis), was evaluated with confocal laser scanning microscopy (CLSM) and scanning electron microscopy (SEM). Transmission electron microscopy (TEM) and real-time quantitative PCR (qRT-PCR) were used to study cell membrane changes and the underlying antimicrobial mechanism. Compared with the other two peptides, TBP-1-GGG-hBD3-3 presented stronger antibacterial activity and remained stable in saliva and serum. Therefore, it was chosen as the best candidate to modify Ti surfaces in this study. This peptide inhibited the growth of initial streptococci and biofilm formation on Ti surfaces with no cytotoxicity to MC3T3-E1 cells. Disruption of the integrity of bacterial membranes and decreased expression of adhesion protein genes from S. gordonii revealed aspects of the antibacterial mechanism of TBP-1-GGG-hBD3-3. We conclude that engineered chimeric peptides with antimicrobial activity provide a potential solution for inhibiting biofilm formation on Ti surfaces to reduce or prevent the occurrence of peri-implant diseases.
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Affiliation(s)
- Hongjuan Geng
- School and Hospital of Stomatology, Tianjin Medical University, 12 Observatory Road, Tianjin 300070, PR China
| | - Yang Yuan
- General Hospital, Tianjin Medical University, 154 An Shan Road, Tianjin 300052, PR China
| | - Aidina Adayi
- School and Hospital of Stomatology, Tianjin Medical University, 12 Observatory Road, Tianjin 300070, PR China
| | - Xu Zhang
- School and Hospital of Stomatology, Tianjin Medical University, 12 Observatory Road, Tianjin 300070, PR China
| | - Xin Song
- Basic Medical Research Center, Tianjin Medical University, 12 Observatory Road, Tianjin 300070, PR China
| | - Lei Gong
- Department of Esophageal Cancer, Tianjin Clinical Research Center for Cancer and Key Laboratory of Cancer Prevention and Therapy, National Clinical Research Center for Cancer, Tianjin Medical University Cancer Institute and Hospital, Tianjin 300070, PR China
| | - Xi Zhang
- School and Hospital of Stomatology, Tianjin Medical University, 12 Observatory Road, Tianjin 300070, PR China.
| | - Ping Gao
- School and Hospital of Stomatology, Tianjin Medical University, 12 Observatory Road, Tianjin 300070, PR China.
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Lázaro-Díez M, Chapartegui-González I, Redondo-Salvo S, Leigh C, Merino D, Segundo DS, Fernández A, Navas J, Icardo JM, Acosta F, Ocampo-Sosa A, Martínez-Martínez L, Ramos-Vivas J. Human neutrophils phagocytose and kill Acinetobacter baumannii and A. pittii. Sci Rep 2017; 7:4571. [PMID: 28676640 PMCID: PMC5496873 DOI: 10.1038/s41598-017-04870-8] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Accepted: 05/22/2017] [Indexed: 12/23/2022] Open
Abstract
Acinetobacter baumannii is a common cause of health care associated infections worldwide. A. pittii is an opportunistic pathogen also frequently isolated from Acinetobacter infections other than those from A. baumannii. Knowledge of Acinetobacter virulence factors and their role in pathogenesis is scarce. Also, there are no detailed published reports on the interactions between A. pittii and human phagocytic cells. Using confocal laser and scanning electron microscopy, immunofluorescence, and live-cell imaging, our study shows that immediately after bacteria-cell contact, neutrophils rapidly and continuously engulf and kill bacteria during at least 4 hours of infection in vitro. After 3 h of infection, neutrophils start to release neutrophil extracellular traps (NETs) against Acinetobacter. DNA in NETs colocalizes well with human histone H3 and with the specific neutrophil elastase. We have observed that human neutrophils use large filopodia as cellular tentacles to sense local environment but also to detect and retain bacteria during phagocytosis. Furthermore, co-cultivation of neutrophils with human differentiated macrophages before infections shows that human neutrophils, but not macrophages, are key immune cells to control Acinetobacter. Although macrophages were largely activated by both bacterial species, they lack the phagocytic activity demonstrated by neutrophils.
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Affiliation(s)
- María Lázaro-Díez
- Instituto de Investigación Valdecilla IDIVAL, Santander, 39011, Spain
- Servicio de Microbiología, Hospital Universitario Marqués de Valdecilla, Santander, 39008, Spain
- Red Española de Investigación en Patología Infecciosa (REIPI), Instituto de Salud Carlos III, Madrid, 28029, Spain
| | - Itziar Chapartegui-González
- Instituto de Investigación Valdecilla IDIVAL, Santander, 39011, Spain
- Servicio de Microbiología, Hospital Universitario Marqués de Valdecilla, Santander, 39008, Spain
| | | | - Chike Leigh
- New York University School of Medicine, New York, 10003, USA
| | - David Merino
- Instituto de Investigación Valdecilla IDIVAL, Santander, 39011, Spain
- Servicio de Inmunología, Hospital Universitario Marqués de Valdecilla, Santander, 39008, Spain
| | - David San Segundo
- Instituto de Investigación Valdecilla IDIVAL, Santander, 39011, Spain
- Servicio de Inmunología, Hospital Universitario Marqués de Valdecilla, Santander, 39008, Spain
| | - Adrián Fernández
- Instituto de Investigación Valdecilla IDIVAL, Santander, 39011, Spain
| | - Jesús Navas
- Instituto de Investigación Valdecilla IDIVAL, Santander, 39011, Spain
- Departamento de Biología Molecular, Universidad de Cantabria, Santander, 39011, Spain
| | - José Manuel Icardo
- Departamento de Anatomía y Biología Celular, Universidad de Cantabria, Santander, 39011, Spain
| | - Félix Acosta
- Grupo de Investigación en Acuicultura, Universidad de Las Palmas de Gran Canaria, Gran Canaria, 35214, Spain
| | - Alain Ocampo-Sosa
- Instituto de Investigación Valdecilla IDIVAL, Santander, 39011, Spain
- Servicio de Microbiología, Hospital Universitario Marqués de Valdecilla, Santander, 39008, Spain
- Red Española de Investigación en Patología Infecciosa (REIPI), Instituto de Salud Carlos III, Madrid, 28029, Spain
| | - Luis Martínez-Martínez
- Red Española de Investigación en Patología Infecciosa (REIPI), Instituto de Salud Carlos III, Madrid, 28029, Spain
- Unidad de Gestión Clínica de Microbiología, Hospital Universitario Reina Sofía, Córdoba, 14004, Spain
- Instituto Maimónides de Investigación Biomédica de Córdoba (IMIBIC), Córdoba, 14004, Spain
| | - José Ramos-Vivas
- Instituto de Investigación Valdecilla IDIVAL, Santander, 39011, Spain.
- Servicio de Microbiología, Hospital Universitario Marqués de Valdecilla, Santander, 39008, Spain.
- Red Española de Investigación en Patología Infecciosa (REIPI), Instituto de Salud Carlos III, Madrid, 28029, Spain.
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Manohar P, Shanthini T, Ayyanar R, Bozdogan B, Wilson A, Tamhankar AJ, Nachimuthu R, Lopes BS. The distribution of carbapenem- and colistin-resistance in Gram-negative bacteria from the Tamil Nadu region in India. J Med Microbiol 2017; 66:874-883. [PMID: 28671537 DOI: 10.1099/jmm.0.000508] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
PURPOSE The occurrence of carbapenem- and colistin-resistance among Gram-negative bacteria is increasing worldwide. The aim of this study was to understand the distribution of carbapenem- and colistin-resistance in two areas in Tamil Nadu, India. METHODOLOGY The clinical isolates (n=89) used in this study were collected from two diagnostic centres in Tamil Nadu, India. The bacterial isolates were screened for meropenem- and colistin-resistance. Further, resistance genes blaNDM-1, blaOXA-48-like, blaIMP, blaVIM, blaKPC, mcr-1 and mcr-2 and integrons were studied. The synergistic effect of meropenem in combination with colistin was assessed. RESULTS A total of 89 bacterial isolates were studied which included Escherichia coli (n=43), Klebsiella pneumoniae (n=18), Pseudomonas aeruginosa (n=10), Enterobacter cloacae (n=6), Acinetobacter baumannii (n=5), Klebsiella oxytoca (n=4), Proteus mirabilis (n=2) and Salmonella paratyphi (n=1). MIC testing showed that 58/89 (65 %) and 29/89 (32 %) isolates were resistant to meropenem and colistin, respectively, whereas 27/89 (30 %) isolates were resistant to both antibiotics. Escherichia coli, K. pneumoniae, K. oxytoca, Pseudomonas aeruginosa, and Enterobacter cloacae isolates were blaNDM-1-positive (n=20). Some strains of Escherichia coli, K. pneumoniae and K. oxytoca were blaOXA-181-positive (n=4). Class 1, 2 and 3 integrons were found in 24, 20 and 3 isolates, respectively. Nine NDM-1-positive Escherichia coli strains could transfer carbapenem resistance via plasmids to susceptible Escherichia coli AB1157. Meropenem and colistin showed synergy in 10/20 (50 %) isolates by 24 h time-kill studies. CONCLUSION Our results highlight the distribution of carbapenem- and colistin-resistance in Gram-negative bacteria isolated from the Tamil Nadu region in South India.
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Affiliation(s)
- Prasanth Manohar
- Department of Biomedical Sciences, School of Biosciences and Technology, Antibiotic Resistance Laboratory, VIT University, Vellore 632014, Tamil Nadu, India
| | - Thamaraiselvan Shanthini
- School of Medicine, Medical Sciences and Nutrition, Medical Microbiology, University of Aberdeen, Aberdeen, UK
| | - Ramankannan Ayyanar
- Department of Biomedical Sciences, School of Biosciences and Technology, Antibiotic Resistance Laboratory, VIT University, Vellore 632014, Tamil Nadu, India
| | - Bulent Bozdogan
- Medical Microbiology Department, Adnan Menderes University, Aydin 09100, Turkey
| | - Aruni Wilson
- Division of Microbiology and Molecular Genetics, School of Medicine, Loma Linda University, CA 92350, USA
| | - Ashok J Tamhankar
- Department of Public Health Sciences, Global Health, Health Systems and Policy: Medicines in the health system - focusing antibiotics, Karolinska Institutet, Stockholm, Sweden
- Department of Environmental Medicine, Indian Initiative for Management of Antibiotic Resistance, Ruxmaniben Deepchand Gardi Medical College, Ujjain, India
| | - Ramesh Nachimuthu
- Department of Biomedical Sciences, School of Biosciences and Technology, Antibiotic Resistance Laboratory, VIT University, Vellore 632014, Tamil Nadu, India
| | - Bruno S Lopes
- School of Medicine, Medical Sciences and Nutrition, Medical Microbiology, University of Aberdeen, Aberdeen, UK
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Rangel M, Castro FFDS, Mota-Lima LD, Clissa PB, Martins DB, Cabrera MPDS, Mortari MR. Polydim-I antimicrobial activity against MDR bacteria and its model membrane interaction. PLoS One 2017; 12:e0178785. [PMID: 28570651 PMCID: PMC5453574 DOI: 10.1371/journal.pone.0178785] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2017] [Accepted: 05/18/2017] [Indexed: 01/26/2023] Open
Abstract
The rapid spread of multi-drug resistant pathogens represents a serious threat to public health, considering factors such as high mortality rates, treatment restrictions and high prevalence of multi-drug resistant bacteria in the hospital environment. Antimicrobial peptides (AMPs) may exhibit powerful antimicrobial activity against different and diverse microorganisms, also presenting the advantage of absence or low toxicity towards animal cells. In this study, the evaluation of the antimicrobial activity against multi-drug resistant bacteria of a recently described AMP from wasp, Polydim-I, was performed. Polydim-I presented activity against standard strains (non-carriers of multi-resistant genes) that are susceptible to commercial antimicrobials, and also against multi-drug resistant strains at concentrations bellow 1μg/ml (0.41 μM). This is a rather low concentration among those reported for AMPs. At this concentration we found out that Polydim-I inhibits almost 100% of the tested pathogens growth, while with the ATCC strains the minimum inhibitory concentration (MIC100) is 400 times higher. Also, in relation to in vitro activity of conventional drugs against multi-drug resistant bacteria strains, Polydim-I is almost 10 times more efficient and with broader spectrum. Cationic AMPs are known as multi-target compounds and specially for targeting the phospholipid matrix of bacterial membranes. Exploring the interactions of Polydim-I with lipid bilayers, we have confirmed that this interaction is involved in the mechanism of action. Circular dichroism experiments showed that Polydim-I undergoes a conformational transition from random coil to a mostly helical conformation in the presence of membrane mimetic environments. Zeta potential measurements confirmed the binding and partial charge neutralization of anionic asolectin vesicles, and also suggested a possible aggregation of peptide molecules. FTIR experiments confirmed that some peptide aggregation occurs, which is minimized in the presence of strongly anionic micelles of sodium dodecyl sulfate. Also, Polydim-I induced channel-like structures formation to asolectin lipid bilayers, as demonstrated in the electrophysiology experiments. We suggest that cationic Polydim-I targets the membrane lipids due to electrostatic attraction, partially accumulates, neutralizing the opposite charges and induces pore formation. Similar mechanism of action has already been suggested for other peptides from wasp venoms, especially mastoparans.
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Affiliation(s)
- Marisa Rangel
- Immunopathology Laboratory, Butantan Institute, Sao Paulo-SP, Brazil
- Laboratory of Neuropharmacology, Department of Physiological Sciences, Institute of Biological Sciences, University of Brasília, Brasília-DF, Brazil
- * E-mail:
| | - Fabíola Fernandes dos Santos Castro
- Laboratory of Neuropharmacology, Department of Physiological Sciences, Institute of Biological Sciences, University of Brasília, Brasília-DF, Brazil
| | | | | | - Danubia Batista Martins
- Departamento de Física, Universidade Estadual Paulista, UNESP, São José do Rio Preto, SP, Brazil
| | - Marcia Perez dos Santos Cabrera
- Departamento de Física, Universidade Estadual Paulista, UNESP, São José do Rio Preto, SP, Brazil
- Departamento de Química e Ciências Ambientais, Universidade Estadual Paulista, UNESP, São José do Rio Preto, SP, Brazil
| | - Marcia Renata Mortari
- Laboratory of Neuropharmacology, Department of Physiological Sciences, Institute of Biological Sciences, University of Brasília, Brasília-DF, Brazil
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Lin CH, Lee MC, Tzen JTC, Lee HM, Chang SM, Tu WC, Lin CF. Efficacy of Mastoparan-AF alone and in combination with clinically used antibiotics on nosocomial multidrug-resistant Acinetobacter baumannii. Saudi J Biol Sci 2016; 24:1023-1029. [PMID: 28663698 PMCID: PMC5478288 DOI: 10.1016/j.sjbs.2016.12.013] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2016] [Revised: 06/25/2016] [Accepted: 12/05/2016] [Indexed: 11/27/2022] Open
Abstract
Emergence of multidrug-resistant Acinetobacter baumannii (MDRAB) has become a critical clinical problem worldwide and limited therapeutic options for infectious diseases caused by MDRAB. Therefore, there is an urgent need for the development of new antimicrobial agents or alternative therapy to combat MDRAB infection. The aim of this study was to investigate effects of Mastoparan-AF (MP-AF), an amphipathic peptide isolated from the hornet venom of Vespa affinis with broad-spectrum antimicrobial activity, on MDRAB. As compared with clinical used antibiotics, MP-AF exhibited potent antimicrobial activity at 2–16 μg/ml against the reference strain A. baumannii ATCC 15151 and seven MDRAB clinical isolates, especially the colistin-resistant MDRAB, E0158. The synergistic antimicrobial combination study revealed that MP-AF acted synergistically with specific antibiotics, e.g., ciprofloxacin, trimethoprim/sulfamethoxazole (SXT) or colistin against some isolates of the MDRAB. It was noteworthy when MP-AF combined with SXT exhibited synergistic activity against all SXT-resistant MDRAB isolates. The synergistic combination of MP-AF and antibiotics could reduce the dosage recommended of each antimicrobial agent and improve the safety of medications with ignorable adverse effects, such as colistin with nephrotoxicity in therapeutic dose. Furthermore, MP-AF combined with antibiotics with different antimicrobial mechanisms could reduce selective pressure of antibiotics on bacteria and prevent the emergence of antimicrobial-resistant strains. Importantly, we are the first finding that MP-AF could make MDRAB from the original non-susceptibility to SXT become sensitivity. In conclusion, MP-AF alone or in combination with other antibiotics, especially SXT, is a potential candidate against MDRAB infection in clinical medicine.
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Affiliation(s)
- Chun-Hsien Lin
- Department of Entomology, National Chung Hsing University, Taichung, Taiwan
| | - Mong-Chuan Lee
- Graduate Institute of Biotechnology and Biomedical Engineering, Central Taiwan University of Science and Technology, Taichung, Taiwan
| | - Jason T C Tzen
- Graduate Institute of Biotechnology, National Chung Hsing University, Taichung, Taiwan
| | - Hsien-Ming Lee
- Department of Nursing, Central Taiwan University of Science and Technology, Taichung, Taiwan
| | - Sam-Min Chang
- Department of Medical Laboratory Science and Biotechnology, Feng Yuan Hospital, Ministry of Health and Welfare, Taichung, Taiwan
| | - Wu-Chun Tu
- Department of Entomology, National Chung Hsing University, Taichung, Taiwan
| | - Chuen-Fu Lin
- Department of Veterinary Medicine, National Chiayi University, Chiayi City, Taiwan
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40
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Kwon AJ, Moon JY, Kim WK, Kim S, Hur J. Protection efficacy of the Brucella abortus ghost vaccine candidate lysed by the N-terminal 24-amino acid fragment (GI24) of the 36-amino acid peptide PMAP-36 (porcine myeloid antimicrobial peptide 36) in murine models. J Vet Med Sci 2016; 78:1541-1548. [PMID: 27349900 PMCID: PMC5095622 DOI: 10.1292/jvms.16-0036] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Brucella abortus cells were lysed by the N-terminal 24-amino acid fragment (GI24) of the 36-amino acid peptide PMAP-36 (porcine myeloid
antimicrobial peptide 36). Next, the protection efficacy of the lysed fragment as a vaccine candidate was evaluated. Group A mice were immunized with sterile
PBS, group B mice were intraperitoneally (ip) immunized with 3 × 108 colony-forming units (CFUs) of B. abortus strain RB51, group C
mice were immunized ip with 3 × 108 cells of the B. abortus vaccine candidate, and group D mice were orally immunized with 3 ×
109 cells of the B. abortus vaccine candidate. Brucella lipopolysaccharide (LPS)-specific serum IgG titers were
considerably higher in groups C and D than in group A. The levels of interleukin (IL)-4, IL-10, tumor necrosis factor alpha (TNF-α) and interferon gamma (IFN-γ)
were significantly higher in groups B–D than in group A. After an ip challenge with B. abortus 544, only group C mice showed a significant
level of protection as compared to group A. Overall, these results show that ip immunization with a vaccine candidate lysed by GI24 can effectively protect mice
from systemic infection with virulent B. abortus.
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Affiliation(s)
- Ae Jeong Kwon
- Veterinary Public Health, College of Veterinary Medicine and Bio-Safety Research Institute, Chonbuk National University, Iksan 54596, Republic of Korea
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Bernhards RC, Cote CK, Amemiya K, Waag DM, Klimko CP, Worsham PL, Welkos SL. Characterization of in vitro phenotypes of Burkholderia pseudomallei and Burkholderia mallei strains potentially associated with persistent infection in mice. Arch Microbiol 2016; 199:277-301. [PMID: 27738703 PMCID: PMC5306356 DOI: 10.1007/s00203-016-1303-8] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2016] [Revised: 09/18/2016] [Accepted: 09/29/2016] [Indexed: 12/29/2022]
Abstract
Burkholderia pseudomallei (Bp) and Burkholderia mallei (Bm), the agents of melioidosis and glanders, respectively, are Tier 1 biothreats. They infect humans and animals, causing disease ranging from acute and fatal to protracted and chronic. Chronic infections are especially challenging to treat, and the identification of in vitro phenotypic markers which signal progression from acute to persistent infection would be extremely valuable. First, a phenotyping strategy was developed employing colony morphotyping, chemical sensitivity testing, macrophage infection, and lipopolysaccharide fingerprint analyses to distinguish Burkholderia strains. Then mouse spleen isolates collected 3–180 days after infection were characterized phenotypically. Isolates from long-term infections often exhibited increased colony morphology differences and altered patterns of antimicrobial sensitivity and macrophage infection. Some of the Bp and Bm persistent infection isolates clearly displayed enhanced virulence in mice. Future studies will evaluate the potential role and significance of these phenotypic markers in signaling the establishment of a chronic infection.
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Affiliation(s)
- R C Bernhards
- Bacteriology Division, United States Army Medical Research Institute of Infectious Diseases (USAMRIID), 1425 Porter Street, Fort Detrick, Frederick, MD, 21702-5011, USA
- Present Address: Edgewood Chemical Biological Centre, Aberdeen Proving Ground, Edgewood, MD, 21010-5424, USA
| | - C K Cote
- Bacteriology Division, United States Army Medical Research Institute of Infectious Diseases (USAMRIID), 1425 Porter Street, Fort Detrick, Frederick, MD, 21702-5011, USA
| | - K Amemiya
- Bacteriology Division, United States Army Medical Research Institute of Infectious Diseases (USAMRIID), 1425 Porter Street, Fort Detrick, Frederick, MD, 21702-5011, USA
| | - D M Waag
- Bacteriology Division, United States Army Medical Research Institute of Infectious Diseases (USAMRIID), 1425 Porter Street, Fort Detrick, Frederick, MD, 21702-5011, USA
| | - C P Klimko
- Bacteriology Division, United States Army Medical Research Institute of Infectious Diseases (USAMRIID), 1425 Porter Street, Fort Detrick, Frederick, MD, 21702-5011, USA
| | - P L Worsham
- Bacteriology Division, United States Army Medical Research Institute of Infectious Diseases (USAMRIID), 1425 Porter Street, Fort Detrick, Frederick, MD, 21702-5011, USA
| | - S L Welkos
- Bacteriology Division, United States Army Medical Research Institute of Infectious Diseases (USAMRIID), 1425 Porter Street, Fort Detrick, Frederick, MD, 21702-5011, USA.
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Rashid R, Veleba M, Kline KA. Focal Targeting of the Bacterial Envelope by Antimicrobial Peptides. Front Cell Dev Biol 2016; 4:55. [PMID: 27376064 PMCID: PMC4894902 DOI: 10.3389/fcell.2016.00055] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2016] [Accepted: 05/23/2016] [Indexed: 01/15/2023] Open
Abstract
Antimicrobial peptides (AMPs) are utilized by both eukaryotic and prokaryotic organisms. AMPs such as the human beta defensins, human neutrophil peptides, human cathelicidin, and many bacterial bacteriocins are cationic and capable of binding to anionic regions of the bacterial surface. Cationic AMPs (CAMPs) target anionic lipids [e.g., phosphatidylglycerol (PG) and cardiolipins (CL)] in the cell membrane and anionic components [e.g., lipopolysaccharide (LPS) and lipoteichoic acid (LTA)] of the cell envelope. Bacteria have evolved mechanisms to modify these same targets in order to resist CAMP killing, e.g., lysinylation of PG to yield cationic lysyl-PG and alanylation of LTA. Since CAMPs offer a promising therapeutic alternative to conventional antibiotics, which are becoming less effective due to rapidly emerging antibiotic resistance, there is a strong need to improve our understanding about the AMP mechanism of action. Recent literature suggests that AMPs often interact with the bacterial cell envelope at discrete foci. Here we review recent AMP literature, with an emphasis on focal interactions with bacteria, including (1) CAMP disruption mechanisms, (2) delocalization of membrane proteins and lipids by CAMPs, and (3) CAMP sensing systems and resistance mechanisms. We conclude with new approaches for studying the bacterial membrane, e.g., lipidomics, high resolution imaging, and non-detergent-based membrane domain extraction.
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Affiliation(s)
- Rafi Rashid
- Singapore Centre for Environmental Life Sciences Engineering, School of Biological Sciences, Nanyang Technological University Singapore, Singapore
| | - Mark Veleba
- Singapore Centre for Environmental Life Sciences Engineering, School of Biological Sciences, Nanyang Technological University Singapore, Singapore
| | - Kimberly A Kline
- Singapore Centre for Environmental Life Sciences Engineering, School of Biological Sciences, Nanyang Technological University Singapore, Singapore
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Smani Y, Pachón-Ibáñez ME, Pachón J. New molecules and adjuvants in the treatment of infections by Acinetobacter baumannii. Expert Opin Pharmacother 2016; 17:1207-14. [PMID: 27067283 DOI: 10.1080/14656566.2016.1176144] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
INTRODUCTION The current problems of the treatment of infections by Acinetobacter baumannii are linked with the increase of multidrug- and extensive-drug resistance and the lack of development of new antimicrobial drugs for Gram-negative bacilli. For these reasons, new alternatives for the treatment and control of severe infections by A. baumannii are necessary. Several studies have reported the effect of adjuvants to restore the efficacy of existing antimicrobial agents. AREAS COVERED In the present review, the authors describe the main results in the development of adjuvant drugs as well as new data on antimicrobial peptides, in monotherapy or in combination therapy with existing antimicrobial agents, which have shown promising preclinical results in vitro and in vivo. EXPERT OPINION The preclinical evaluation of adjuvants and antimicrobial peptides, in monotherapy or in combination therapy, for A. baumannii infections has shown promising results. However, caution is needed and further extensive in vivo studies and clinical trials have to be performed to confirm the potential use of these adjuvants as true therapeutic alternatives.
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Affiliation(s)
- Younes Smani
- a Clinical Unit of Infectious Diseases, Microbiology, and Preventive Medicine , Institute of Biomedicine of Seville (IBiS), University Hospital Virgen del Rocío/CSIC/University of Seville , Seville , Spain
| | - María Eugenia Pachón-Ibáñez
- a Clinical Unit of Infectious Diseases, Microbiology, and Preventive Medicine , Institute of Biomedicine of Seville (IBiS), University Hospital Virgen del Rocío/CSIC/University of Seville , Seville , Spain
| | - Jerónimo Pachón
- a Clinical Unit of Infectious Diseases, Microbiology, and Preventive Medicine , Institute of Biomedicine of Seville (IBiS), University Hospital Virgen del Rocío/CSIC/University of Seville , Seville , Spain
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Acinetobacter baumannii Infection and IL-17 Mediated Immunity. Mediators Inflamm 2016; 2016:9834020. [PMID: 26977122 PMCID: PMC4762998 DOI: 10.1155/2016/9834020] [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] [Received: 09/25/2015] [Accepted: 01/11/2016] [Indexed: 01/25/2023] Open
Abstract
Acinetobacter baumannii is a significant cause of severe hospital-acquired infections with a recent rise in multidrug-resistant infections involving traumatic wounds of military personnel. The interleukin-17 (IL-17) pathway is essential for neutrophil recruitment in response to a variety of pathogens, while the control of A. baumannii infection is known to be dependent on neutrophils. This suggests that IL-17 may play an important role in A. baumannii infection; however, this has yet to be studied. Here, we summarize the recent advances in understanding the host-pathogen interaction of A. baumannii and propose a potential role of the IL-17 pathway in generating a protective immune response.
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Pan T, Liu X, Xiang S, Ji W. Treatment for patients with multidrug resistant Acinetobacter baumannii pulmonary infection. Exp Ther Med 2016; 11:1345-1347. [PMID: 27073447 PMCID: PMC4812438 DOI: 10.3892/etm.2016.3051] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2015] [Accepted: 02/08/2016] [Indexed: 01/26/2023] Open
Abstract
Bacterial infections are common but have become increasingly resistant to drugs. The aim of the present study was to examine the combined treatment of traditional Chinese and Western medicine in 30 cases of pulmonary infection with multidrug resistant Acinetobacter baumannii. Patients were divided into groups A and B according to drug treatments. Cefoperazone or sulbactam and tanreqing were administered in group A, and cefoperazone or sulbactam in group B. The curative effect and prognosis of the two groups were recorded and the remaining treatments were performed routinely in the clinic. For the combined therapy group, which was administered sulperazone and tanreqing, 8 patients were recovered, 6 patients had significant effects, 3 patients exhibited some improvement and 1 patient had no response. One of the patients did not survive after 28 days. By contrast, there were 4 patients that were successfully treated, 3 patients with significant effects, 2 patients with some improvement and 2 patients had no response in the sulperazone group, and 4 patients did not survive after 28 days. In conclusion, the combined therapy of cefoperazone or sulbactam supplemented with tanreqing was identified to be more effective than cefoperazone or sulbactam as monotherapy, for treating multidrug resistant Acinetobacter baumannii.
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Affiliation(s)
- Tao Pan
- Department of Intensive Care Medicine, Xiangyang Hospital Affiliated to Hubei University of Medicine, Xiangyang, Hubei 441000, P.R. China
| | - Xiaoyun Liu
- Department of Intensive Care Medicine, Xiangyang Hospital Affiliated to Hubei University of Medicine, Xiangyang, Hubei 441000, P.R. China
| | - Shougui Xiang
- Department of Intensive Care Medicine, Xiangyang Hospital Affiliated to Hubei University of Medicine, Xiangyang, Hubei 441000, P.R. China
| | - Wenli Ji
- Department of Intensive Care Medicine, Xiangyang Hospital Affiliated to Hubei University of Medicine, Xiangyang, Hubei 441000, P.R. China
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In Vitro Activity of the Novel Antimicrobial Peptide Dendrimer G3KL against Multidrug-Resistant Acinetobacter baumannii and Pseudomonas aeruginosa. Antimicrob Agents Chemother 2015; 59:7915-8. [PMID: 26459893 DOI: 10.1128/aac.01853-15] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2015] [Accepted: 10/03/2015] [Indexed: 01/28/2023] Open
Abstract
The in vitro activity of the novel antimicrobial peptide dendrimer G3KL was evaluated against 32 Acinetobacter baumannii (including 10 OXA-23, 7 OXA-24, and 11 OXA-58 carbapenemase producers) and 35 Pseudomonas aeruginosa (including 18 VIM and 3 IMP carbapenemase producers) strains and compared to the activities of standard antibiotics. Overall, both species collections showed MIC50/90 values of 8/8 μg/ml and minimum bactericidal concentrations at which 50% or 90% of strains tested are killed (MBC50/90) of 8/8 μg/ml. G3KL is a promising molecule with antibacterial activity against multidrug-resistant and extensively drug-resistant A. baumannii and P. aeruginosa isolates.
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47
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Li RF, Yan XH, Lu YB, Lu YL, Zhang HR, Chen SH, Liu S, Lu ZF. Anti-candidal activity of a novel peptide derived from human chromogranin A and its mechanism of action against Candida krusei. Exp Ther Med 2015; 10:1768-1776. [PMID: 26640548 PMCID: PMC4665730 DOI: 10.3892/etm.2015.2731] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2014] [Accepted: 08/13/2015] [Indexed: 11/17/2022] Open
Abstract
Candida species (Candida spp.) are important fungal pathogens, which cause numerous clinical diseases associated with significant mortality and morbidity in healthcare settings. In our previous study, we identified a recombinant peptide, chromogranin A (CGA)-N46, corresponding to the N-terminal Pro31-Gln76 sequence of human CGA, that exhibited antifungal activity against Candida albicans. The present study investigated the antifungal activity of CGA-N46, and its underlying mechanism, against numerous Candida spp. CGA-N46 inhibited the growth of all of the tested Candida spp., of which Candida krusei exhibited the greatest sensitivity. CGA-N46 was able to disrupt the stability of the phospholipid monolayer without damaging the integrity and permeability of the outer membrane of C. krusei cells, and induced cytoplasm vacuolization and mitochondrial damage. In addition, treatment of C. krusei with CGA-N46 was associated with decreased levels of intracellular reactive oxygen species, a reduction in the mitochondrial membrane potential, and DNA synthesis inhibition. The results of the present study suggested that CGA-N46 was able to pass through the cell membrane of Candida spp. by temporarily destabilizing the phospholipid membrane, which in turn led to mitochondrial dysfunction and inhibition of DNA synthesis. Therefore, CGA-N46 may be considered a novel antifungal compound for the treatment of patients with C. krusei infections.
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Affiliation(s)
- Rui-Fang Li
- College of Biological Engineering, Henan University of Technology, Zhengzhou, Henan 450001, P.R. China
| | - Xiao-Hui Yan
- College of Biological Engineering, Henan University of Technology, Zhengzhou, Henan 450001, P.R. China
| | - Yan-Bo Lu
- College of Biological Engineering, Henan University of Technology, Zhengzhou, Henan 450001, P.R. China
| | - Ya-Li Lu
- College of Biological Engineering, Henan University of Technology, Zhengzhou, Henan 450001, P.R. China
| | - Hui-Ru Zhang
- College of Biological Engineering, Henan University of Technology, Zhengzhou, Henan 450001, P.R. China
| | - Shi-Hua Chen
- College of Biological Engineering, Henan University of Technology, Zhengzhou, Henan 450001, P.R. China
| | - Shuai Liu
- College of Biological Engineering, Henan University of Technology, Zhengzhou, Henan 450001, P.R. China
| | - Zhi-Fang Lu
- College of Biological Engineering, Henan University of Technology, Zhengzhou, Henan 450001, P.R. China
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48
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Lipopolysaccharide loss produces partial colistin dependence and collateral sensitivity to azithromycin, rifampicin and vancomycin in Acinetobacter baumannii. Int J Antimicrob Agents 2015; 46:696-702. [PMID: 26391380 DOI: 10.1016/j.ijantimicag.2015.07.017] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2015] [Revised: 07/29/2015] [Accepted: 07/29/2015] [Indexed: 12/11/2022]
Abstract
Treatment options for multidrug-resistant (MDR) strains of Acinetobacter baumannii that acquire resistance to colistin are limited. Acinetobacter baumannii can become highly resistant to colistin through complete loss of lipopolysaccharide (LPS) owing to mutations in the genes encoding the first three enzymes involved in lipid A biosynthesis (lpxA, lpxC and lpxD). The objective of this study was to characterise the susceptibility to 15 clinically relevant antibiotics and 6 antimicrobial peptides (AMPs) of MDR A. baumannii clinical isolates that acquired colistin resistance due to mutations in lpxA, lpxC and lpxD as well as their colistin-susceptible counterparts. A dramatic increase in antibiotic susceptibility (≥16-fold increase) was observed upon LPS loss for azithromycin, rifampicin and vancomycin, whereas a moderate increase in susceptibility was seen for amikacin, ceftazidime, imipenem, cefepime and meropenem. Importantly, concentrations ranging from 8 mg/L to 32 mg/L of the six AMPs were able to reduce bacterial viability by ≥3 log10 in growth curve assays. We also demonstrate that colistin resistance results in partial colistin dependence for growth in LPS-deficient strains containing mutations in lpxA, lpxC and lpxD, but not when colistin resistance occurs via LPS modification due to mutations in the PmrA/B two-component system. The results of this study indicate that loss of LPS expression results in collateral sensitivity to azithromycin, rifampicin and vancomycin, and that the six AMPs tested retain activity against LPS-deficient strains, indicating that these antibiotics may be viable treatment options for infections caused by these strains.
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Galdiero E, Maselli V, Falanga A, Gesuele R, Galdiero S, Fulgione D, Guida M. Integrated analysis of the ecotoxicological and genotoxic effects of the antimicrobial peptide melittin on Daphnia magna and Pseudokirchneriella subcapitata. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2015; 203:145-152. [PMID: 25884346 DOI: 10.1016/j.envpol.2015.03.046] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2014] [Revised: 03/23/2015] [Accepted: 03/29/2015] [Indexed: 06/04/2023]
Abstract
Melittin is a major constituent of the bee venom of Apis mellifera with a broad spectrum of activities. Melittin therapeutical potential is subject to its toxicity and the assessment of ecotoxicity and genotoxicity is of particular interest for therapeutic use. Here we analyzed the biological effects of melittin on two aquatic species, which are representative of two different levels of the aquatic trophic chain: the invertebrate Daphnia magna and the unicellular microalgae Pseudokirchneriella subcapitata. The attention was focused on the determination of: i) ecotoxicity; ii) genotoxicity; iii) antigenotoxicity. Our main finding is that melittin is detrimental to D. magna reproduction and its sub-lethal concentrations create an accumulation dependent on exposition times and a negative effect on DNA. We also observed that melittin significantly delayed time to first eggs. Moreover, results showed that melittin exerted its toxic and genotoxic effects in both species, being a bit more aggressive towards P. subcapitata.
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Affiliation(s)
- Emilia Galdiero
- Department of Biology, University of Naples "Federico II", Via Cinthia Complesso Monte Sant'Angelo, 80134, Naples, Italy.
| | - Valeria Maselli
- Department of Biology, University of Naples "Federico II", Via Cinthia Complesso Monte Sant'Angelo, 80134, Naples, Italy
| | - Annarita Falanga
- Department of Pharmacy, University of Naples "Federico II", Via Mezzocannone 16, 80134, Naples, Italy; DFM Scarl, University of Naples "Federico II", Via Mezzocannone 16, 80134, Naples, Italy
| | - Renato Gesuele
- Department of Biology, University of Naples "Federico II", Via Cinthia Complesso Monte Sant'Angelo, 80134, Naples, Italy
| | - Stefania Galdiero
- Department of Pharmacy, University of Naples "Federico II", Via Mezzocannone 16, 80134, Naples, Italy
| | - Domenico Fulgione
- Department of Biology, University of Naples "Federico II", Via Cinthia Complesso Monte Sant'Angelo, 80134, Naples, Italy
| | - Marco Guida
- Department of Biology, University of Naples "Federico II", Via Cinthia Complesso Monte Sant'Angelo, 80134, Naples, Italy
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50
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Huang W, Wang S, Yao Y, Xia Y, Yang X, Long Q, Sun W, Liu C, Li Y, Ma Y. OmpW is a potential target for eliciting protective immunity against Acinetobacter baumannii infections. Vaccine 2015. [PMID: 26207591 DOI: 10.1016/j.vaccine.2015.07.031] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Acinetobacter baumannii (A. baumannii) is an important conditioned pathogen that causes nosocomial and community-associated infections. In this study, we sought to investigate whether outer membrane protein W (OmpW) is a potential target for eliciting protective immunity against A. baumannii infections. Mice immunized with the fusion protein thioredoxin-OmpW generated strong OmpW-specific IgG responses. In a sepsis model, both active and passive immunizations against OmpW effectively protected mice from A. baumannii infections. This protection was demonstrated by a significantly improved survival rate, reduced bacterial burdens within organs, and the suppressed accumulation of inflammatory cytokines and chemokines in sera. Opsonophagocytic assays with murine macrophage RAW264.7 cells indicated that the bactericidal effects of the antisera derived from the immunized mice are mediated synergistically by specific antibodies and complement components. The antisera presented significant opsonophagocytic activities against homologous strains and clonally distinct clinical isolates in vitro. Protein data analysis showed that the sequence of OmpW, which has a molecule length of 183 amino acids, is more than 91% conserved in reported A. baumannii strains. In conclusion, we identified OmpW as a highly immunogenic and conserved protein as a valuable antigen candidate for the development of an effective vaccine or the preparation of antisera to control A. baumannii infections.
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Affiliation(s)
- Weiwei Huang
- Laboratory of Molecular Immunology, Institute of Medical Biology, Chinese Academy of Medical Sciences & Peking Union Medical College, Kunming 650118, China; Yunnan Key Laboratory of Vaccine Research & Development on Severe Infectious Diseases, Kunming 650118, China; Yunnan Engineering Research Center of Vaccine Research and Development on Severe Infectious Diseases, Kunming 650118, China
| | - Shijie Wang
- Laboratory of Molecular Immunology, Institute of Medical Biology, Chinese Academy of Medical Sciences & Peking Union Medical College, Kunming 650118, China; Yunnan Key Laboratory of Vaccine Research & Development on Severe Infectious Diseases, Kunming 650118, China; Yunnan Engineering Research Center of Vaccine Research and Development on Severe Infectious Diseases, Kunming 650118, China
| | - Yufeng Yao
- Laboratory of Molecular Immunology, Institute of Medical Biology, Chinese Academy of Medical Sciences & Peking Union Medical College, Kunming 650118, China; Yunnan Key Laboratory of Vaccine Research & Development on Severe Infectious Diseases, Kunming 650118, China; Yunnan Engineering Research Center of Vaccine Research and Development on Severe Infectious Diseases, Kunming 650118, China
| | - Ye Xia
- Laboratory of Molecular Immunology, Institute of Medical Biology, Chinese Academy of Medical Sciences & Peking Union Medical College, Kunming 650118, China; Yunnan Key Laboratory of Vaccine Research & Development on Severe Infectious Diseases, Kunming 650118, China; Yunnan Engineering Research Center of Vaccine Research and Development on Severe Infectious Diseases, Kunming 650118, China
| | - Xu Yang
- Laboratory of Molecular Immunology, Institute of Medical Biology, Chinese Academy of Medical Sciences & Peking Union Medical College, Kunming 650118, China; Yunnan Key Laboratory of Vaccine Research & Development on Severe Infectious Diseases, Kunming 650118, China; Yunnan Engineering Research Center of Vaccine Research and Development on Severe Infectious Diseases, Kunming 650118, China
| | - Qiong Long
- Laboratory of Molecular Immunology, Institute of Medical Biology, Chinese Academy of Medical Sciences & Peking Union Medical College, Kunming 650118, China; Yunnan Key Laboratory of Vaccine Research & Development on Severe Infectious Diseases, Kunming 650118, China; Yunnan Engineering Research Center of Vaccine Research and Development on Severe Infectious Diseases, Kunming 650118, China
| | - Wenjia Sun
- Laboratory of Molecular Immunology, Institute of Medical Biology, Chinese Academy of Medical Sciences & Peking Union Medical College, Kunming 650118, China; Yunnan Key Laboratory of Vaccine Research & Development on Severe Infectious Diseases, Kunming 650118, China; Yunnan Engineering Research Center of Vaccine Research and Development on Severe Infectious Diseases, Kunming 650118, China
| | - Cunbao Liu
- Laboratory of Molecular Immunology, Institute of Medical Biology, Chinese Academy of Medical Sciences & Peking Union Medical College, Kunming 650118, China; Yunnan Key Laboratory of Vaccine Research & Development on Severe Infectious Diseases, Kunming 650118, China; Yunnan Engineering Research Center of Vaccine Research and Development on Severe Infectious Diseases, Kunming 650118, China
| | - Yang Li
- Laboratory of Molecular Immunology, Institute of Medical Biology, Chinese Academy of Medical Sciences & Peking Union Medical College, Kunming 650118, China; Yunnan Key Laboratory of Vaccine Research & Development on Severe Infectious Diseases, Kunming 650118, China; Yunnan Engineering Research Center of Vaccine Research and Development on Severe Infectious Diseases, Kunming 650118, China
| | - Yanbing Ma
- Laboratory of Molecular Immunology, Institute of Medical Biology, Chinese Academy of Medical Sciences & Peking Union Medical College, Kunming 650118, China; Yunnan Key Laboratory of Vaccine Research & Development on Severe Infectious Diseases, Kunming 650118, China; Yunnan Engineering Research Center of Vaccine Research and Development on Severe Infectious Diseases, Kunming 650118, China.
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