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Wang L, Liu Y, Pang R, Guo Y, Ren Y, Wu Y, Cao Z. The Tick Saliva Peptide HIDfsin2 TLR4-Dependently Inhibits the Tick-Borne Severe Fever with Thrombocytopenia Syndrome Virus in Mouse Macrophages. Antibiotics (Basel) 2024; 13:449. [PMID: 38786177 PMCID: PMC11117380 DOI: 10.3390/antibiotics13050449] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2024] [Revised: 04/25/2024] [Accepted: 05/06/2024] [Indexed: 05/25/2024] Open
Abstract
Ticks transmit a variety of pathogens to their hosts by feeding on blood. The interactions and struggle between tick pathogens and hosts have evolved bilaterally. The components of tick saliva can directly or indirectly trigger host biological responses in a manner that promotes pathogen transmission; however, host cells continuously develop strategies to combat pathogen infection and transmission. Moreover, it is still unknown how host cells develop their defense strategies against tick-borne viruses during tick sucking. Here, we found that the tick saliva peptide HIDfsin2 enhanced the antiviral innate immunity of mouse macrophages by activating the Toll-like receptor 4 (TLR4) signaling pathway, thereby restricting tick-borne severe fever with thrombocytopenia syndrome virus (SFTSV) replication. HIDfsin2 was identified to interact with lipopolysaccharide (LPS), a ligand of TLR4, and then depolymerize LPS micelles into smaller particles, effectively enhancing the activation of the nuclear factor kappa-B (NF-κB) and type I interferon (IFN-I) signaling pathways, which are downstream of TLR4. Expectedly, TLR4 knockout completely eliminated the promotion effect of HIDfsin2 on NF-κB and type I interferon activation. Moreover, HIDfsin2 enhanced SFTSV replication in TLR4-knockout mouse macrophages, which is consistent with our recent report that HIDfsin2 hijacked p38 mitogen-activated protein kinase (MAPK) to promote the replication of tick-borne SFTSV in A549 and Huh7 cells (human cell lines) with low expression of TLR4. Together, these results provide new insights into the innate immune mechanism of host cells following tick bites. Our study also shows a rare molecular event relating to the mutual antagonism between tick-borne SFTSV and host cells mediated by the tick saliva peptide HIDfsin2 at the tick-host-virus interface.
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Affiliation(s)
- Luyao Wang
- National “111” Center for Cellular Regulation and Molecular Pharmaceutics, Key Laboratory of Fermentation Engineering (Ministry of Education), Hubei University of Technology, Wuhan 430068, China;
- State Key Laboratory of Virology, College of Life Sciences, Wuhan University, Wuhan 430072, China; (Y.L.); (R.P.); (Y.G.); (Y.R.); (Y.W.)
- Shenzhen Research Institute, Wuhan University, Shenzhen 518057, China
| | - Yishuo Liu
- State Key Laboratory of Virology, College of Life Sciences, Wuhan University, Wuhan 430072, China; (Y.L.); (R.P.); (Y.G.); (Y.R.); (Y.W.)
| | - Rui Pang
- State Key Laboratory of Virology, College of Life Sciences, Wuhan University, Wuhan 430072, China; (Y.L.); (R.P.); (Y.G.); (Y.R.); (Y.W.)
| | - Yiyuan Guo
- State Key Laboratory of Virology, College of Life Sciences, Wuhan University, Wuhan 430072, China; (Y.L.); (R.P.); (Y.G.); (Y.R.); (Y.W.)
| | - Yingying Ren
- State Key Laboratory of Virology, College of Life Sciences, Wuhan University, Wuhan 430072, China; (Y.L.); (R.P.); (Y.G.); (Y.R.); (Y.W.)
| | - Yingliang Wu
- State Key Laboratory of Virology, College of Life Sciences, Wuhan University, Wuhan 430072, China; (Y.L.); (R.P.); (Y.G.); (Y.R.); (Y.W.)
| | - Zhijian Cao
- National “111” Center for Cellular Regulation and Molecular Pharmaceutics, Key Laboratory of Fermentation Engineering (Ministry of Education), Hubei University of Technology, Wuhan 430068, China;
- State Key Laboratory of Virology, College of Life Sciences, Wuhan University, Wuhan 430072, China; (Y.L.); (R.P.); (Y.G.); (Y.R.); (Y.W.)
- Shenzhen Research Institute, Wuhan University, Shenzhen 518057, China
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Hwang JW, Lee SG, Kang H. Antioxidant, Antibacterial Properties of Novel Peptide CP by Enzymatic Hydrolysis of Chromis notata By-Products and Its Efficacy on Atopic Dermatitis. Mar Drugs 2024; 22:44. [PMID: 38248669 PMCID: PMC10817315 DOI: 10.3390/md22010044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2023] [Revised: 01/06/2024] [Accepted: 01/11/2024] [Indexed: 01/23/2024] Open
Abstract
This study investigated the antioxidant, antimicrobial, and anti-atopic dermatitis (AD) effects of a novel peptide (CP) derived from a Chromis notata by-product hydrolysate. Alcalase, Flavourzyme, Neutrase, and Protamex enzymes were used to hydrolyze the C. notata by-product protein, and the 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) radical-scavenging activity was measured. Alcalase hydrolysate exhibited the highest ABTS radical-scavenging activity, leading to the selection of Alcalase for further purification. The CHAO-1-I fraction, with the highest ABTS activity, was isolated and further purified, resulting in the identification of the peptide CP with the amino acid sequence Ala-Gln-Val-Met-Lys-Leu-Pro-His-Arg-Met-Gln-His-Ser-Gln-Ser. CP demonstrated antimicrobial activity against Staphylococcus aureus, inhibiting its growth. In a 2,4-dinitrochlorobenzene (DNCB)-induced AD-like skin model in mice, CP significantly alleviated skin lesions, reduced epidermal and dermal thickness, and inhibited mast cell infiltration. Moreover, CP suppressed the elevated levels of interleukin-6 (IL-6) in the plasma of DNCB-induced mice. These findings highlight the potential of CP as a therapeutic agent for AD and suggest a novel application of this C. notata by-product in the fish processing industry.
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Affiliation(s)
| | - Sung-Gyu Lee
- Department of Medical Laboratory Science, College of Health Science, Dankook University, Cheonan-si 31116, Chungcheongnam-do, Republic of Korea;
| | - Hyun Kang
- Department of Medical Laboratory Science, College of Health Science, Dankook University, Cheonan-si 31116, Chungcheongnam-do, Republic of Korea;
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Van Moll L, Wouters M, De Smet J, De Vooght L, Delputte P, Van Der Borght M, Cos P. In-depth biological characterization of two black soldier fly anti- Pseudomonas peptides reveals LPS-binding and immunomodulating effects. mSphere 2023; 8:e0045423. [PMID: 37800918 PMCID: PMC10597467 DOI: 10.1128/msphere.00454-23] [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: 08/11/2023] [Accepted: 08/22/2023] [Indexed: 10/07/2023] Open
Abstract
As effector molecules of the innate immune system, antimicrobial peptides (AMPs) have gathered substantial interest as a potential future generation of antibiotics. Here, we demonstrate the anti-Pseudomonas activity and lipopolysaccharide (LPS)-binding ability of HC1 and HC10, two cecropin peptides from the black soldier fly (Hermetia Illucens). Both peptides are active against a wide range of Pseudomonas aeruginosa strains, including drug-resistant clinical isolates. Moreover, HC1 and HC10 can bind to lipid A, the toxic center of LPS and reduce the LPS-induced nitric oxide and cytokine production in murine macrophage cells. This suggests that the peptide-LPS binding can also lower the strong inflammatory response associated with P. aeruginosa infections. As the activity of AMPs is often influenced by the presence of salts, we studied the LPS-binding activity of HC1 and HC10 in physiological salt concentrations, revealing a strong decrease in activity. Our research confirmed the early potential of HC1 and HC10 as starting points for anti-Pseudomonas drugs, as well as the need for structural or formulation optimization before further preclinical development can be considered. IMPORTANCE The high mortality and morbidity associated with Pseudomonas aeruginosa infections remain an ongoing challenge in clinical practice that requires urgent action. P. aeruginosa mostly infects immunocompromised individuals, and its prevalence is especially high in urgent care hospital settings. Lipopolysaccharides (LPSs) are outer membrane structures that are responsible for inducing the innate immune cascade upon infection. P. aeruginosa LPS can cause local excessive inflammation, or spread systemically throughout the body, leading to multi-organ failure and septic shock. As antimicrobial resistance rates in P. aeruginosa infections are rising, the research and development of new antimicrobial agents remain indispensable. Especially, antimicrobials that can both kill the bacteria themselves and neutralize their toxins are of great interest in P. aeruginosa research to develop as the next generation of drugs.
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Affiliation(s)
- Laurence Van Moll
- Laboratory of Microbiology, Parasitology and Hygiene (LMPH), Faculty of Pharmaceutical, Biomedical and Veterinary Sciences, University of Antwerp, Antwerp, Belgium
- Department of Microbial and Molecular Systems (M2S), Research Group for Insect Production and Processing (IP&P), KU Leuven, Campus Geel, Geel, Belgium
| | - Milan Wouters
- Laboratory of Microbiology, Parasitology and Hygiene (LMPH), Faculty of Pharmaceutical, Biomedical and Veterinary Sciences, University of Antwerp, Antwerp, Belgium
| | - Jeroen De Smet
- Department of Microbial and Molecular Systems (M2S), Research Group for Insect Production and Processing (IP&P), KU Leuven, Campus Geel, Geel, Belgium
| | - Linda De Vooght
- Laboratory of Microbiology, Parasitology and Hygiene (LMPH), Faculty of Pharmaceutical, Biomedical and Veterinary Sciences, University of Antwerp, Antwerp, Belgium
| | - Peter Delputte
- Laboratory of Microbiology, Parasitology and Hygiene (LMPH), Faculty of Pharmaceutical, Biomedical and Veterinary Sciences, University of Antwerp, Antwerp, Belgium
| | - Mik Van Der Borght
- Department of Microbial and Molecular Systems (M2S), Research Group for Insect Production and Processing (IP&P), KU Leuven, Campus Geel, Geel, Belgium
| | - Paul Cos
- Laboratory of Microbiology, Parasitology and Hygiene (LMPH), Faculty of Pharmaceutical, Biomedical and Veterinary Sciences, University of Antwerp, Antwerp, Belgium
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Sen S, Samat R, Jash M, Ghosh S, Roy R, Mukherjee N, Ghosh S, Sarkar J, Ghosh S. Potential Broad-Spectrum Antimicrobial, Wound Healing, and Disinfectant Cationic Peptide Crafted from Snake Venom. J Med Chem 2023; 66:11555-11572. [PMID: 37566805 DOI: 10.1021/acs.jmedchem.3c01150] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/13/2023]
Abstract
Antimicrobial cationic peptides are intriguing and propitious antibiotics for the future, even against multidrug-resistant superbugs. Venoms serve as a source of cutting-edge therapeutics and innovative, unexplored medicines. In this study, a novel cationic peptide library consisting of seven sequences was designed and synthesized from the snake venom cathelicidin, batroxicidin (BatxC), with the inclusion of the FLPII motif at the N-terminus. SP1V3_1 demonstrated exceptional antibacterial effectiveness against Escherichia coli, methicillin-resistant Staphylococcus aureus (MRSA), Pseudomonas aeruginosa, and Klebsiella pneumoniae and destroyed the bacteria by depolarizing, rupturing, and permeabilizing their membranes, as evident from fluorescence assays, atomic force microscopy, and scanning electron microscopy. SP1V3_1 was observed to modulate the immune response in LPS-elicited U937 cells and exhibited good antibiofilm activity against MRSA and K. pneumoniae. The peptide promoted wound healing and disinfection in the murine model. The study demonstrated that SP1V3_1 is an exciting peptide lead and may be explored further for the development of better therapeutic peptides.
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Affiliation(s)
- Samya Sen
- Department of Bioscience and Bioengineering, Indian Institute of Technology, Jodhpur, Rajasthan 342030, India
- iHUB Drishti Foundation, Indian Institute of Technology, Jodhpur, Rajasthan 342030, India
| | - Ramkamal Samat
- Smart Healthcare Department, Interdisciplinary Research Platform, Indian Institute of Technology, Jodhpur, Rajasthan 342030, India
| | - Moumita Jash
- Department of Bioscience and Bioengineering, Indian Institute of Technology, Jodhpur, Rajasthan 342030, India
| | - Satyajit Ghosh
- Department of Bioscience and Bioengineering, Indian Institute of Technology, Jodhpur, Rajasthan 342030, India
| | - Rajsekhar Roy
- Department of Bioscience and Bioengineering, Indian Institute of Technology, Jodhpur, Rajasthan 342030, India
| | - Nabanita Mukherjee
- Smart Healthcare Department, Interdisciplinary Research Platform, Indian Institute of Technology, Jodhpur, Rajasthan 342030, India
| | - Surojit Ghosh
- Smart Healthcare Department, Interdisciplinary Research Platform, Indian Institute of Technology, Jodhpur, Rajasthan 342030, India
| | - Jayita Sarkar
- Centre for Research and Development of Scientific Instruments, Indian Institute of Technology, Jodhpur, Rajasthan 342030, India
| | - Surajit Ghosh
- Department of Bioscience and Bioengineering, Indian Institute of Technology, Jodhpur, Rajasthan 342030, India
- Smart Healthcare Department, Interdisciplinary Research Platform, Indian Institute of Technology, Jodhpur, Rajasthan 342030, India
- iHUB Drishti Foundation, Indian Institute of Technology, Jodhpur, Rajasthan 342030, India
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5
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Reactive metal boride nanoparticles trap lipopolysaccharide and peptidoglycan for bacteria-infected wound healing. Nat Commun 2022; 13:7353. [PMID: 36446788 PMCID: PMC9708144 DOI: 10.1038/s41467-022-35050-6] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Accepted: 11/17/2022] [Indexed: 11/30/2022] Open
Abstract
Bacteria and excessive inflammation are two main factors causing non-healing wounds. However, current studies have mainly focused on the inhibition of bacteria survival for wound healing while ignoring the excessive inflammation induced by dead bacteria-released lipopolysaccharide (LPS) or peptidoglycan (PGN). Herein, a boron-trapping strategy has been proposed to prevent both infection and excessive inflammation by synthesizing a class of reactive metal boride nanoparticles (MB NPs). Our results show that the MB NPs are gradually hydrolyzed to generate boron dihydroxy groups and metal cations while generating a local alkaline microenvironment. This microenvironment greatly enhances boron dihydroxy groups to trap LPS or PGN through an esterification reaction, which not only enhances metal cation-induced bacterial death but also inhibits dead bacteria-induced excessive inflammation both in vitro and in vivo, finally accelerating wound healing. Taken together, this boron-trapping strategy provides an approach to the treatment of bacterial infection and the accompanying inflammation.
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Otazo-Pérez A, Asensio-Calavia P, González-Acosta S, Baca-González V, López MR, Morales-delaNuez A, Pérez de la Lastra JM. Antimicrobial Activity of Cathelicidin-Derived Peptide from the Iberian Mole Talpa occidentalis. Vaccines (Basel) 2022; 10:vaccines10071105. [PMID: 35891269 PMCID: PMC9323388 DOI: 10.3390/vaccines10071105] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2022] [Revised: 07/07/2022] [Accepted: 07/08/2022] [Indexed: 02/05/2023] Open
Abstract
The immune systems of all vertebrates contain cathelicidins, a family of antimicrobial peptides. Cathelicidins are a type of innate immune effector that have a number of biological functions, including a well-known direct antibacterial action and immunomodulatory function. In search of new templates for antimicrobial peptide discovery, we have identified and characterized the cathelicidin of the small mammal Talpa occidentalis. We describe the heterogeneity of cathelicidin in the order Eulipotyphla in relation to the Iberian mole and predict its antibacterial activity using bioinformatics tools. In an effort to correlate these findings, we derived the putative active peptide and performed in vitro hemolysis and antimicrobial activity assays, confirming that Iberian mole cathelicidins are antimicrobial. Our results showed that the Iberian mole putative peptide, named To-KL37 (KLFGKVGNLLQKGWQKIKNIGRRIKDFFRNIRPMQEA) has antibacterial and antifungal activity. Understanding the antimicrobial defense of insectivores may help scientists prevent the spread of pathogens to humans. We hope that this study can also provide new, effective antibacterial peptides for future drug development.
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Affiliation(s)
- Andrea Otazo-Pérez
- Biotechnology of Macromolecules Research Group, Instituto de Productos Naturales y Agrobiología (IPNA-CSIC), Avda. Astrofísico Francisco Sánchez, 3, 38206 San Cristóbal de la Laguna, Spain; (A.O.-P.); (P.A.-C.); (S.G.-A.); (V.B.-G.); (M.R.L.); (A.M.-d.)
- Escuela de Doctorado y Estudios de Posgrado, Universidad de La Laguna, Avda. Astrofísico Francisco Sánchez, SN. Edificio Calabaza-Apdo. 456, 38200 San Cristóbal de La Laguna, Spain
| | - Patricia Asensio-Calavia
- Biotechnology of Macromolecules Research Group, Instituto de Productos Naturales y Agrobiología (IPNA-CSIC), Avda. Astrofísico Francisco Sánchez, 3, 38206 San Cristóbal de la Laguna, Spain; (A.O.-P.); (P.A.-C.); (S.G.-A.); (V.B.-G.); (M.R.L.); (A.M.-d.)
- Escuela de Doctorado y Estudios de Posgrado, Universidad de La Laguna, Avda. Astrofísico Francisco Sánchez, SN. Edificio Calabaza-Apdo. 456, 38200 San Cristóbal de La Laguna, Spain
| | - Sergio González-Acosta
- Biotechnology of Macromolecules Research Group, Instituto de Productos Naturales y Agrobiología (IPNA-CSIC), Avda. Astrofísico Francisco Sánchez, 3, 38206 San Cristóbal de la Laguna, Spain; (A.O.-P.); (P.A.-C.); (S.G.-A.); (V.B.-G.); (M.R.L.); (A.M.-d.)
- Escuela de Doctorado y Estudios de Posgrado, Universidad de La Laguna, Avda. Astrofísico Francisco Sánchez, SN. Edificio Calabaza-Apdo. 456, 38200 San Cristóbal de La Laguna, Spain
| | - Victoria Baca-González
- Biotechnology of Macromolecules Research Group, Instituto de Productos Naturales y Agrobiología (IPNA-CSIC), Avda. Astrofísico Francisco Sánchez, 3, 38206 San Cristóbal de la Laguna, Spain; (A.O.-P.); (P.A.-C.); (S.G.-A.); (V.B.-G.); (M.R.L.); (A.M.-d.)
| | - Manuel R. López
- Biotechnology of Macromolecules Research Group, Instituto de Productos Naturales y Agrobiología (IPNA-CSIC), Avda. Astrofísico Francisco Sánchez, 3, 38206 San Cristóbal de la Laguna, Spain; (A.O.-P.); (P.A.-C.); (S.G.-A.); (V.B.-G.); (M.R.L.); (A.M.-d.)
| | - Antonio Morales-delaNuez
- Biotechnology of Macromolecules Research Group, Instituto de Productos Naturales y Agrobiología (IPNA-CSIC), Avda. Astrofísico Francisco Sánchez, 3, 38206 San Cristóbal de la Laguna, Spain; (A.O.-P.); (P.A.-C.); (S.G.-A.); (V.B.-G.); (M.R.L.); (A.M.-d.)
| | - José Manuel Pérez de la Lastra
- Biotechnology of Macromolecules Research Group, Instituto de Productos Naturales y Agrobiología (IPNA-CSIC), Avda. Astrofísico Francisco Sánchez, 3, 38206 San Cristóbal de la Laguna, Spain; (A.O.-P.); (P.A.-C.); (S.G.-A.); (V.B.-G.); (M.R.L.); (A.M.-d.)
- Correspondence: ; Tel.: +34-922260112
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Chumponanomakun P, Niramitranon J, Chairatana P, Pongprayoon P. Molecular insights into the adsorption mechanism of E21R and T7E21R human defensin 5 on a bacterial membrane. MOLECULAR SIMULATION 2022. [DOI: 10.1080/08927022.2022.2086253] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- Phoom Chumponanomakun
- Department of Chemistry, Faculty of Science, Kasetsart University, Bangkok, Thailand
| | - Jitti Niramitranon
- Department of Computer Engineering, Faculty of Engineering, Kasetsart University, Bangkok, Thailand
| | - Phoom Chairatana
- Department of Microbiology, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
| | - Prapasiri Pongprayoon
- Department of Chemistry, Faculty of Science, Kasetsart University, Bangkok, Thailand
- Center for Advanced Studies in Nanotechnology for Chemical, Food and Agricultural Industries, KU Institute for Advanced Studies, Kasetsart University, Bangkok, Thailand
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Valenti GE, Alfei S, Caviglia D, Domenicotti C, Marengo B. Antimicrobial Peptides and Cationic Nanoparticles: A Broad-Spectrum Weapon to Fight Multi-Drug Resistance Not Only in Bacteria. Int J Mol Sci 2022; 23:ijms23116108. [PMID: 35682787 PMCID: PMC9181033 DOI: 10.3390/ijms23116108] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Revised: 05/25/2022] [Accepted: 05/27/2022] [Indexed: 11/16/2022] Open
Abstract
In the last few years, antibiotic resistance and, analogously, anticancer drug resistance have increased considerably, becoming one of the main public health problems. For this reason, it is crucial to find therapeutic strategies able to counteract the onset of multi-drug resistance (MDR). In this review, a critical overview of the innovative tools available today to fight MDR is reported. In this direction, the use of membrane-disruptive peptides/peptidomimetics (MDPs), such as antimicrobial peptides (AMPs), has received particular attention, due to their high selectivity and to their limited side effects. Moreover, similarities between bacteria and cancer cells are herein reported and the hypothesis of the possible use of AMPs also in anticancer therapies is discussed. However, it is important to take into account the limitations that could negatively impact clinical application and, in particular, the need for an efficient delivery system. In this regard, the use of nanoparticles (NPs) is proposed as a potential strategy to improve therapy; moreover, among polymeric NPs, cationic ones are emerging as promising tools able to fight the onset of MDR both in bacteria and in cancer cells.
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Affiliation(s)
- Giulia E. Valenti
- Department of Experimental Medicine (DIMES), General Pathology Section, University of Genoa, 16132 Genoa, Italy; (G.E.V.); (B.M.)
| | - Silvana Alfei
- Department of Pharmacy, University of Genoa, 16148 Genoa, Italy;
| | - Debora Caviglia
- Department of Surgical Sciences and Integrated Diagnostics (DISC), University of Genoa, Viale Benedetto XV, 6, 16132 Genova, Italy;
| | - Cinzia Domenicotti
- Department of Experimental Medicine (DIMES), General Pathology Section, University of Genoa, 16132 Genoa, Italy; (G.E.V.); (B.M.)
- Inter-University Center for the Promotion of the 3Rs Principles in Teaching & Research (Centro 3R), 56122 Pisa, Italy
- Correspondence: ; Tel.: +39-010-353-8830
| | - Barbara Marengo
- Department of Experimental Medicine (DIMES), General Pathology Section, University of Genoa, 16132 Genoa, Italy; (G.E.V.); (B.M.)
- Inter-University Center for the Promotion of the 3Rs Principles in Teaching & Research (Centro 3R), 56122 Pisa, Italy
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Ramazi S, Mohammadi N, Allahverdi A, Khalili E, Abdolmaleki P. A review on antimicrobial peptides databases and the computational tools. Database (Oxford) 2022; 2022:6550847. [PMID: 35305010 PMCID: PMC9216472 DOI: 10.1093/database/baac011] [Citation(s) in RCA: 23] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Revised: 02/04/2022] [Accepted: 02/28/2022] [Indexed: 12/29/2022]
Abstract
Antimicrobial Peptides (AMPs) have been considered as potential alternatives for infection therapeutics since antibiotic resistance has been raised as a global problem. The AMPs are a group of natural peptides that play a crucial role in the immune system in various organisms AMPs have features such as a short length and efficiency against microbes. Importantly, they have represented low toxicity in mammals which makes them potential candidates for peptide-based drugs. Nevertheless, the discovery of AMPs is accompanied by several issues which are associated with labour-intensive and time-consuming wet-lab experiments. During the last decades, numerous studies have been conducted on the investigation of AMPs, either natural or synthetic type, and relevant data are recently available in many databases. Through the advancement of computational methods, a great number of AMP data are obtained from publicly accessible databanks, which are valuable resources for mining patterns to design new models for AMP prediction. However, due to the current flaws in assessing computational methods, more interrogations are warranted for accurate evaluation/analysis. Considering the diversity of AMPs and newly reported ones, an improvement in Machine Learning algorithms are crucial. In this review, we aim to provide valuable information about different types of AMPs, their mechanism of action and a landscape of current databases and computational tools as resources to collect AMPs and beneficial tools for the prediction and design of a computational model for new active AMPs.
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Affiliation(s)
- Shahin Ramazi
- Department of Biophysics, Faculty of Biological Sciences, Tarbiat Modares University, Jalal Ale Ahmad Highway, Tehran 14115-111, Iran
| | - Neda Mohammadi
- Department of Medical Biotechnology, Faculty of Allied Medical Sciences, Iran University of Medical Sciences, Hemmat Highway, Tehran 1449614535, Iran,Institute of Pharmacology and Toxicology, University of Bonn, Biomedical Center, Venusberg Campus 1, Bonn 53127, Germany
| | - Abdollah Allahverdi
- Department of Biophysics, Faculty of Biological Sciences, Tarbiat Modares University, Jalal Ale Ahmad Highway, Tehran 14115-111, Iran
| | - Elham Khalili
- Department of Plant Biology, Faculty of Biological Sciences, Tarbiat Modares University, Jalal Ale Ahmad Highway, Tehran 14115-111, Iran
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Immunomodulatory and Allergenic Properties of Antimicrobial Peptides. Int J Mol Sci 2022; 23:ijms23052499. [PMID: 35269641 PMCID: PMC8910669 DOI: 10.3390/ijms23052499] [Citation(s) in RCA: 41] [Impact Index Per Article: 20.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Revised: 02/20/2022] [Accepted: 02/22/2022] [Indexed: 02/06/2023] Open
Abstract
With the growing problem of the emergence of antibiotic-resistant bacteria, the search for alternative ways to combat bacterial infections is extremely urgent. While analyzing the effect of antimicrobial peptides (AMPs) on immunocompetent cells, their effect on all parts of the immune system, and on humoral and cellular immunity, is revealed. AMPs have direct effects on neutrophils, monocytes, dendritic cells, T-lymphocytes, and mast cells, participating in innate immunity. They act on B-lymphocytes indirectly, enhancing the induction of antigen-specific immunity, which ultimately leads to the activation of adaptive immunity. The adjuvant activity of AMPs in relation to bacterial and viral antigens was the reason for their inclusion in vaccines and made it possible to formulate the concept of a “defensin vaccine” as an innovative basis for constructing vaccines. The immunomodulatory function of AMPs involves their influence on cells in the nearest microenvironment, recruitment and activation of other cells, supporting the response to pathogenic microorganisms and completing the inflammatory process, thus exhibiting a systemic effect. For the successful use of AMPs in medical practice, it is necessary to study their immunomodulatory activity in detail, taking into account their pleiotropy. The degree of maturity of the immune system and microenvironment can contribute to the prevention of complications and increase the effectiveness of therapy, since AMPs can suppress inflammation in some circumstances, but aggravate the response and damage of organism in others. It should also be taken into account that the real functions of one or another AMP depend on the types of total regulatory effects on the target cell, and not only on properties of an individual peptide. A wide spectrum of biological activity, including direct effects on pathogens, inactivation of bacterial toxins and influence on immunocompetent cells, has attracted the attention of researchers, however, the cytostatic activity of AMPs against normal cells, as well as their allergenic properties and low stability to host proteases, are serious limitations for the medical use of AMPs. In this connection, the tasks of searching for compounds that selectively affect the target and development of an appropriate method of application become critically important. The scope of this review is to summarize the current concepts and newest advances in research of the immunomodulatory activity of natural and synthetic AMPs, and to examine the prospects and limitations of their medical use.
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Amiss AS, Henriques ST, Lawrence N. Antimicrobial peptides provide wider coverage for targeting drug‐resistant bacterial pathogens. Pept Sci (Hoboken) 2021. [DOI: 10.1002/pep2.24246] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Anna S. Amiss
- Institute for Molecular Bioscience The University of Queensland Brisbane Queensland Australia
| | - Sónia Troeira Henriques
- Institute for Molecular Bioscience The University of Queensland Brisbane Queensland Australia
- School of Biomedical Sciences Queensland University of Technology, Translational Research Institute Brisbane Queensland Australia
| | - Nicole Lawrence
- Institute for Molecular Bioscience The University of Queensland Brisbane Queensland Australia
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Chook CYB, Chen FM, Leung FP, Chen ZY, Wong WT. Potential of crocodile blood as a medication and dietary supplement: A systemic review. Clin Exp Pharmacol Physiol 2021; 48:1043-1058. [PMID: 33987869 DOI: 10.1111/1440-1681.13524] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Revised: 05/04/2021] [Accepted: 05/10/2021] [Indexed: 12/16/2022]
Abstract
Crocodile blood has long been used as a traditional medicine in many Asian countries to treat diseases such as asthma, allergies, and many others. Yet, only recently has the safety and effectiveness of using crocodile blood as a medicine been examined using modern scientific methods; with both conserved and novel active components identified from crocodile blood. Further in vitro and in vivo investigations found that crocodile blood can have a wide range of beneficial effects, including antimicrobial, antiviral, anti-oxidative, anti-inflammatory, antitumour effects, anti-anaemia, and enhancement of wound healing. A systematic research of literature published in English-language journals up to April 2020 was conducted in PubMed, Google Scholar, and Web of Science. Based on the biological and chemical knowledge of crocodile immunity and crocodile blood, this article aims to: provide a critical review on the proposed properties of crocodile blood, identify the knowledge gap and offer some insights for future investigations regarding the use of crocodile blood as a medication or dietary supplement.
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Affiliation(s)
- Chui Yiu Bamboo Chook
- School of Life Sciences, Faculty of Science, The Chinese University of Hong Kong, Hong Kong, China
| | - Francis M Chen
- School of Life Sciences, Faculty of Science, The Chinese University of Hong Kong, Hong Kong, China
| | - Fung Ping Leung
- School of Life Sciences, Faculty of Science, The Chinese University of Hong Kong, Hong Kong, China
| | - Zhen-Yu Chen
- School of Life Sciences, Faculty of Science, The Chinese University of Hong Kong, Hong Kong, China
| | - Wing Tak Wong
- School of Life Sciences, Faculty of Science, The Chinese University of Hong Kong, Hong Kong, China
- State Key Laboratory of Agrobiotechnology, The Chinese University of Hong Kong, Hong Kong, China
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Osman A, Enan G, Al-Mohammadi AR, Abdel-Shafi S, Abdel-Hameid S, Sitohy MZ, El-Gazzar N. Antibacterial Peptides Produced by Alcalase from Cowpea Seed Proteins. Antibiotics (Basel) 2021; 10:870. [PMID: 34356791 PMCID: PMC8300757 DOI: 10.3390/antibiotics10070870] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2021] [Revised: 07/12/2021] [Accepted: 07/15/2021] [Indexed: 11/16/2022] Open
Abstract
Cowpea seed protein hydrolysates (CPH) were output from cowpea seeds applying alcalase® from Bacillus licheniformis. CPH with an elevated level of hydrolysis was fractionated by size exclusion chromatography (SEC). Both CPH and SEC-portions showed to contain antimicrobial peptides (AMPs) as they inhibited both Gram-positive bacteria, such as Listeria monocytogenes LMG10470 (L. monocytogenes), Listeria innocua. LMG11387 (L. innocua), Staphylococcus aureus ATCC25923 (S.aureus), and Streptococcus pyogenes ATCC19615 (St.pyogenes), and Gram-negative bacteria, such as Klebsiella pnemoniae ATCC43816 (K. pnemoniae), Pseudomonas aeroginosa ATCC26853 (P. aeroginosa), Escherichia coli ATCC25468) (E.coli) and Salmonella typhimurium ATCC14028 (S. typhimurium).The data exhibited that both CPH and size exclusion chromatography-fraction 1 (SEC-F1) showed high antibacterial efficiency versus almost all the assessed bacteria. The MIC of the AMPs within SEC-F1 and CPHs were (25 µg/mL) against P. aeruginosa, E.coli and St. pyogenes. However, higher MICsof approximately 100-150 µg/mL showed for both CPHs and SEC-F1 against both S. aureus and L. innocua; it was 50 µg/mL of CPH against S.aureus. The Electro-spray-ionization-mass-spectrometry (ESI-MS) of fraction (1) revealed 10 dipeptides with a molecular masses arranged from 184 Da to 364 Da and one Penta peptide with a molecular mass of approximately 659 Da inthe case of positive ions. While the negative ions showed 4 dipeptides with the molecular masses that arranged from 330 Da to 373 Da. Transmission electron microscope (TEM) demonstrated that the SEC-F1 induced changes in the bacterial cells affected. Thus, the results suggested that the hydrolysis of cowpea seed proteins by Alcalase is an uncomplicated appliance to intensify its antibacterial efficiency.
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Affiliation(s)
- Ali Osman
- Biochemistry Department, Faculty of Agriculture, Zagazig University, Zagazig 44511, Egypt; (A.O.); (M.Z.S.)
| | - Gamal Enan
- Botany and Microbiology Department, Faculty of Science, Zagazig University, Zagazig44519, Egypt; (S.A.-S.); (S.A.-H.); (N.E.-G.)
| | | | - Seham Abdel-Shafi
- Botany and Microbiology Department, Faculty of Science, Zagazig University, Zagazig44519, Egypt; (S.A.-S.); (S.A.-H.); (N.E.-G.)
| | - Samar Abdel-Hameid
- Botany and Microbiology Department, Faculty of Science, Zagazig University, Zagazig44519, Egypt; (S.A.-S.); (S.A.-H.); (N.E.-G.)
| | - Mahmoud Z. Sitohy
- Biochemistry Department, Faculty of Agriculture, Zagazig University, Zagazig 44511, Egypt; (A.O.); (M.Z.S.)
| | - Nashwa El-Gazzar
- Botany and Microbiology Department, Faculty of Science, Zagazig University, Zagazig44519, Egypt; (S.A.-S.); (S.A.-H.); (N.E.-G.)
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Al-Mohammadi AR, Osman A, Enan G, Abdel-Shafi S, El-Nemer M, Sitohy M, Taha MA. Powerful Antibacterial Peptides from Egg Albumin Hydrolysates. Antibiotics (Basel) 2020; 9:antibiotics9120901. [PMID: 33322196 PMCID: PMC7763489 DOI: 10.3390/antibiotics9120901] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2020] [Revised: 12/08/2020] [Accepted: 12/11/2020] [Indexed: 01/18/2023] Open
Abstract
Native egg albumin (NEA) was isolated from hen eggs and hydrolyzed by pepsin to produce hydrolyzed egg albumin (HEA). HEA was chemically characterized and screened for its antibacterial activity against 10 pathogenic bacteria (6 Gram (+) and 4 Gram (−)). The SDS-PAGE pattern of NEA showed molecular weights of hen egg albumin subunits ranging from 30 to 180 kDa. The highest intensive bands appeared at a molecular mass of about 50 and 97 kDa. Ultra-performance liquid chromatography (UPLC) of the peptic HEA revealed 44 peptides, 17 of them were dipeptides, and the other 27 fractions corresponded to bigger peptides (3–9 amino acids). The dipeptides and big peptides represented 26% and 74% of the total hydrolysate, respectively. The MIC of HEA was about 100 μg/L for Listeria monocytogenes, Bacillus cereus, Staphylococcus aureus, Salmonella typhimurium, Streptococcus pyogenes, and Klebsiella oxytoca and 150 μg/L for Pseudomonas aeruginosa, Bacillus subtilis, and Listeria ivanovii and 200 μg/L for Escherichia coli. L. monocytogenes was the most sensitive organism to HEA. Mixtures of HEA with antibiotics showed more significant antibacterial activity than individually using them. Transmission electron microscopy (TEM) revealed various signs of cellular deformation in the protein-treated bacteria. HEA may electrostatically and hydrophobically interact with the cell wall and cell membrane of the susceptible bacteria, engendering large pores and pore channels leading to cell wall and cell membrane disintegration. Higher cell permeability may, thus, occur, leading to cell emptiness, lysis, and finally death. Alternatively, no toxicity signs appeared when HEA was administrated to Wistar Albino rats as one single dose (2000, 5000 mg/kg body weight) or repeated daily dose (500 and 2500 mg/kg body weight/day) for 28 days to disclose the possible toxicity hazards. HEA did not produce any death.
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Affiliation(s)
- Abdul-Raouf Al-Mohammadi
- Department of Science, King Khalid Military Academy, P.O. Box 22140, Riyadh 11495, Saudi Arabia;
| | - Ali Osman
- Biochemistry Department, Faculty of Agriculture, Zagazig University, Zagazig 44511, Egypt; (A.O.); (M.S.)
| | - Gamal Enan
- Botany and Microbiology Department, Faculty of Science, Zagazig University, Zagazig 44519, Egypt; (M.E.-N.); (M.A.T.)
- Correspondence: (G.E.); (S.A.-S.); Tel.: +20-1009877015 (G.E.); +20-1289600036 (S.A.-S.)
| | - Seham Abdel-Shafi
- Botany and Microbiology Department, Faculty of Science, Zagazig University, Zagazig 44519, Egypt; (M.E.-N.); (M.A.T.)
- Correspondence: (G.E.); (S.A.-S.); Tel.: +20-1009877015 (G.E.); +20-1289600036 (S.A.-S.)
| | - Mona El-Nemer
- Botany and Microbiology Department, Faculty of Science, Zagazig University, Zagazig 44519, Egypt; (M.E.-N.); (M.A.T.)
| | - Mahmoud Sitohy
- Biochemistry Department, Faculty of Agriculture, Zagazig University, Zagazig 44511, Egypt; (A.O.); (M.S.)
| | - Mohamed A. Taha
- Botany and Microbiology Department, Faculty of Science, Zagazig University, Zagazig 44519, Egypt; (M.E.-N.); (M.A.T.)
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15
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Kong X, Song W, Hua Y, Li X, Chen Y, Zhang C, Chen Y. Insights into the antibacterial activity of cottonseed protein-derived peptide against Escherichia coli. Food Funct 2020; 11:10047-10057. [PMID: 33135695 DOI: 10.1039/d0fo01279c] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
In the study, antibacterial peptides were separated and identified from cottonseed protein hydrolysates and the interactions between antibacterial peptides and Escherichia coli were further investigated. Firstly, by using a combined strategy of Amberlite CG-50 ion exchange chromatography and reversed-phase high-performance liquid chromatography, three peptides with antibacterial activity were purified and identified, including HHRRFSLY, KFMPT, and RRLFSDY. Interestingly, HHRRFSLY and RRLFSDY exhibited higher inhibition activity with the IC50 value of 0.26 mg mL-1 and 0.58 mg mL-1 (p < 0.05), respectively. Flow cytometry results showed that the incubation of antibacterial peptides with E. coli could cause damage to the integrity of the E. coli cell membrane. Transmission electron microscopy and scanning electron microscopy results revealed the damage caused to the bacterial cell surface and the leakage of cytoplasmic content by the antibacterial peptides. Molecular docking studies indicated that HHRRFSLY, KFMPT, and RRLFSDY have a good binding affinity to the active sites of the surface protein (OmpF) mainly through a hydrogen bond and salt bridge. The results here showed that the antibacterial peptides derived from cottonseed protein could be used as a good choice for functional foods or related drugs, and also shed light on further studies of antibacterial mechanism.
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Affiliation(s)
- Xiangzhen Kong
- State Key Laboratory of Food Science and Technology, Jiangnan University, China.
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Grassi L, Pompilio A, Kaya E, Rinaldi AC, Sanjust E, Maisetta G, Crabbé A, Di Bonaventura G, Batoni G, Esin S. The Anti-Microbial Peptide (Lin-SB056-1) 2-K Reduces Pro-Inflammatory Cytokine Release through Interaction with Pseudomonas aeruginosa Lipopolysaccharide. Antibiotics (Basel) 2020; 9:antibiotics9090585. [PMID: 32911618 PMCID: PMC7557804 DOI: 10.3390/antibiotics9090585] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Revised: 08/31/2020] [Accepted: 09/07/2020] [Indexed: 01/09/2023] Open
Abstract
The ability of many anti-microbial peptides (AMPs) to modulate the host immune response has highlighted their possible therapeutic use to reduce uncontrolled inflammation during chronic infections. In the present study, we examined the anti-inflammatory potential of the semi-synthetic peptide lin-SB056-1 and its dendrimeric derivative (lin-SB056-1)2-K, which were previously found to have anti-microbial activity against Pseudomonas aeruginosa in in vivo-like models mimicking the challenging environment of chronically infected lungs (i.e., artificial sputum medium and 3-D lung mucosa model). The dendrimeric derivative exerted a stronger anti-inflammatory activity than its monomeric counterpart towards lung epithelial- and macrophage-cell lines stimulated with P. aeruginosa lipopolysaccharide (LPS), based on a marked decrease (up to 80%) in the LPS-induced production of different pro-inflammatory cytokines (i.e., IL-1β, IL-6 and IL-8). Accordingly, (lin-SB056-1)2-K exhibited a stronger LPS-binding affinity than its monomeric counterpart, thereby suggesting a role of peptide/LPS neutralizing interactions in the observed anti-inflammatory effect. Along with the anti-bacterial and anti-biofilm properties, the anti-inflammatory activity of (lin-SB056-1)2-K broadens its therapeutic potential in the context of chronic (biofilm-associated) infections.
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Affiliation(s)
- Lucia Grassi
- Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, 56123 Pisa PI, Italy; (L.G.); (E.K.); (G.M.)
| | - Arianna Pompilio
- Department of Medical, Oral and Biotechnological Sciences, and Center for Advanced Studies and Technology (CAST), “G. d’Annunzio” University of Chieti-Pescara, 66100 Chieti CH, Italy; (A.P.); (G.D.B.)
| | - Esingül Kaya
- Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, 56123 Pisa PI, Italy; (L.G.); (E.K.); (G.M.)
| | - Andrea C. Rinaldi
- Department of Biomedical Sciences, University of Cagliari, 09142 Monserrato CA, Italy; (A.C.R.); (E.S.)
| | - Enrico Sanjust
- Department of Biomedical Sciences, University of Cagliari, 09142 Monserrato CA, Italy; (A.C.R.); (E.S.)
| | - Giuseppantonio Maisetta
- Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, 56123 Pisa PI, Italy; (L.G.); (E.K.); (G.M.)
| | - Aurélie Crabbé
- Laboratory of Pharmaceutical Microbiology, Ghent University, 9000 Gent, Belgium;
| | - Giovanni Di Bonaventura
- Department of Medical, Oral and Biotechnological Sciences, and Center for Advanced Studies and Technology (CAST), “G. d’Annunzio” University of Chieti-Pescara, 66100 Chieti CH, Italy; (A.P.); (G.D.B.)
| | - Giovanna Batoni
- Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, 56123 Pisa PI, Italy; (L.G.); (E.K.); (G.M.)
- Correspondence: (G.B.); (S.E.)
| | - Semih Esin
- Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, 56123 Pisa PI, Italy; (L.G.); (E.K.); (G.M.)
- Correspondence: (G.B.); (S.E.)
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17
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Cantini F, Luzi C, Bouchemal N, Savarin P, Bozzi A, Sette M. Effect of positive charges in the structural interaction of crabrolin isoforms with lipopolysaccharide. J Pept Sci 2020; 26:e3271. [DOI: 10.1002/psc.3271] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2020] [Revised: 05/19/2020] [Accepted: 06/02/2020] [Indexed: 01/04/2023]
Affiliation(s)
- Francesca Cantini
- Magnetic Resonance Center (CERM)University of Florence Sesto Fiorentino Italy
- Department of ChemistryUniversity of Florence Sesto Fiorentino Italy
| | - Carla Luzi
- Department of Biotechnological and Clinical SciencesUniversity of L'Aquila L'Aquila Italy
| | - Nadia Bouchemal
- Sorbonne Paris Cité, CSPBAT LaboratoryUniversity of Paris 13 Bobigny France
| | - Philippe Savarin
- Sorbonne Paris Cité, CSPBAT LaboratoryUniversity of Paris 13 Bobigny France
| | - Argante Bozzi
- Department of Biotechnological and Clinical SciencesUniversity of L'Aquila L'Aquila Italy
| | - Marco Sette
- Sorbonne Paris Cité, CSPBAT LaboratoryUniversity of Paris 13 Bobigny France
- Department of Chemical Sciences and TechnologyUniversity of Rome Tor Vergata Rome Italy
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18
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Abstract
In 1994, the “danger model” argued that adaptive immune responses are driven rather by molecules released upon tissue damage than by the recognition of “strange” molecules. Thus, an alternative to the “self versus non-self recognition model” has been provided. The model, which suggests that the immune system discriminates dangerous from safe molecules, has established the basis for the future designation of damage-associated molecular patterns (DAMPs), a term that was coined by Walter G. Land, Seong, and Matzinger. The pathological importance of DAMPs is barely somewhere else evident as in the posttraumatic or post-surgical inflammation and regeneration. Since DAMPs have been identified to trigger specific immune responses and inflammation, which is not necessarily detrimental but also regenerative, it still remains difficult to describe their “friend or foe” role in the posttraumatic immunogenicity and healing process. DAMPs can be used as biomarkers to indicate and/or to monitor a disease or injury severity, but they also may serve as clinically applicable parameters for optimized indication of the timing for, i.e., secondary surgeries. While experimental studies allow the detection of these biomarkers on different levels including cellular, tissue, and circulatory milieu, this is not always easily transferable to the human situation. Thus, in this review, we focus on the recent literature dealing with the pathophysiological importance of DAMPs after traumatic injury. Since dysregulated inflammation in traumatized patients always implies disturbed resolution of inflammation, so-called model of suppressing/inhibiting inducible DAMPs (SAMPs) will be very briefly introduced. Thus, an update on this topic in the field of trauma will be provided.
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Lee H, Lim SI, Shin SH, Lim Y, Koh JW, Yang S. Conjugation of Cell-Penetrating Peptides to Antimicrobial Peptides Enhances Antibacterial Activity. ACS OMEGA 2019; 4:15694-15701. [PMID: 31572872 PMCID: PMC6761801 DOI: 10.1021/acsomega.9b02278] [Citation(s) in RCA: 65] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2019] [Accepted: 08/27/2019] [Indexed: 05/24/2023]
Abstract
Antimicrobial peptides (AMPs), essential elements in host innate immune defenses against numerous pathogens, have received considerable attention as potential alternatives to conventional antibiotics. Most AMPs exert broad-spectrum antimicrobial activity through depolarization and permeabilization of the bacterial cytoplasmic membrane. Here, we introduce a new approach for enhancing the antibiotic activity of AMPs by conjugation of a cationic cell-penetrating peptide (CPP). Interestingly, CPP-conjugated AMPs elicited only a 2- to 4-fold increase in antimicrobial activity against Gram-positive bacteria, but showed a 4- to 16-fold increase in antimicrobial activity against Gram-negative bacteria. Although CPP-AMP conjugates did not significantly increase membrane permeability, they efficiently translocated across a lipid bilayer. Indeed, confocal microscopy showed that, while AMPs were localized mainly in the membrane of Escherichia coli, the conjugates readily penetrated bacterial cells. In addition, the conjugates exhibited a higher affinity for DNA than unconjugated AMPs. Collectively, we demonstrate that CPP-AMP conjugates possess multiple functional properties, including membrane permeabilization, membrane translocation, and DNA binding, which are involved in their enhanced antibacterial activity against Gram-negative bacteria. We propose that conjugation of CPPs to AMPs may present an effective approach for the development of novel antimicrobials against Gram-negative bacteria.
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Affiliation(s)
- Hyunhee Lee
- Department
of Biomedical Science, Graduate School, Chosun University, Gwangju 61452, South Korea
| | - Sung In Lim
- Department
of Chemical Engineering, Pukyong National
University, Busan 48513, South Korea
| | - Sung-Heui Shin
- Department
of Biomedical Science, Graduate School, Chosun University, Gwangju 61452, South Korea
- Department of Microbiology, Department of Immunology, and Department of
Ophthalmology, Chosun University College
of Medicine, Gwangju 61452, South Korea
| | - Yong Lim
- Department
of Biomedical Science, Graduate School, Chosun University, Gwangju 61452, South Korea
- Department of Microbiology, Department of Immunology, and Department of
Ophthalmology, Chosun University College
of Medicine, Gwangju 61452, South Korea
| | - Jae Woong Koh
- Department of Microbiology, Department of Immunology, and Department of
Ophthalmology, Chosun University College
of Medicine, Gwangju 61452, South Korea
| | - Sungtae Yang
- Department
of Biomedical Science, Graduate School, Chosun University, Gwangju 61452, South Korea
- Department of Microbiology, Department of Immunology, and Department of
Ophthalmology, Chosun University College
of Medicine, Gwangju 61452, South Korea
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20
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Brand GD, Ramada MHS, Manickchand JR, Correa R, Ribeiro DJS, Santos MA, Vasconcelos AG, Abrão FY, Prates MV, Murad AM, Cardozo Fh JL, Leite JRSA, Magalhães KG, Oliveira AL, Bloch C. Intragenic antimicrobial peptides (IAPs) from human proteins with potent antimicrobial and anti-inflammatory activity. PLoS One 2019; 14:e0220656. [PMID: 31386688 PMCID: PMC6684085 DOI: 10.1371/journal.pone.0220656] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2019] [Accepted: 07/19/2019] [Indexed: 11/20/2022] Open
Abstract
Following the treads of our previous works on the unveiling of bioactive peptides encrypted in plant proteins from diverse species, the present manuscript reports the occurrence of four proof-of-concept intragenic antimicrobial peptides in human proteins, named Hs IAPs. These IAPs were prospected using the software Kamal, synthesized by solid phase chemistry, and had their interactions with model phospholipid vesicles investigated by differential scanning calorimetry and circular dichroism. Their antimicrobial activity against bacteria, yeasts and filamentous fungi was determined, along with their cytotoxicity towards erythrocytes. Our data demonstrates that Hs IAPs are capable to bind model membranes while attaining α-helical structure, and to inhibit the growth of microorganisms at concentrations as low as 1μM. Hs02, a novel sixteen residue long internal peptide (KWAVRIIRKFIKGFIS-NH2) derived from the unconventional myosin 1h protein, was further investigated in its capacity to inhibit lipopolysaccharide-induced release of TNF-α in murine macrophages. Hs02 presented potent anti-inflammatory activity, inhibiting the release of TNF-α in LPS-primed cells at the lowest assayed concentration, 0.1 μM. A three-dimensional solution structure of Hs02 bound to DPC micelles was determined by Nuclear Magnetic Resonance. Our work exemplifies how the human genome can be mined for molecules with biotechnological potential in human health and demonstrates that IAPs are actual alternatives to antimicrobial peptides as pharmaceutical agents or in their many other putative applications.
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Affiliation(s)
- Guilherme D. Brand
- Laboratório de Síntese e Análise de Biomoléculas, LSAB, Instituto de Química, Universidade de Brasília, Brasília, DF, Brasil
- * E-mail:
| | - Marcelo H. S. Ramada
- Programa de Pós-Graduação em Ciências Genômicas e Biotecnologia, Universidade Católica de Brasília, Brasília, DF, Brasil
- Programa de Pós-Graduação em Gerontologia, Universidade Católica de Brasília, Brasília, DF, Brasil
- Laboratório de Espectrometria de Massa, LEM, Embrapa Recursos Genéticos e Biotecnologia, Brasília, DF, Brasil
| | - Júlia R. Manickchand
- Laboratório de Síntese e Análise de Biomoléculas, LSAB, Instituto de Química, Universidade de Brasília, Brasília, DF, Brasil
| | - Rafael Correa
- Laboratório de Imunologia e Inflamação, LIMI, Instituto de Biologia, Universidade de Brasília, Brasília, DF, Brasil
| | - Dalila J. S. Ribeiro
- Laboratório de Imunologia e Inflamação, LIMI, Instituto de Biologia, Universidade de Brasília, Brasília, DF, Brasil
| | - Michele A. Santos
- Laboratório de Ressonância Magnética Nuclear, LRMN, Instituto de Química, Universidade de Brasília, Brasília, DF, Brasil
| | - Andreanne G. Vasconcelos
- Núcleo de Pesquisa em Morfologia e Imunologia Aplicada, NuPMIA, Faculdade de Medicina, Campus Universitário Darcy Ribeiro, Universidade de Brasília, Brasília, DF, Brasil
| | | | - Maura V. Prates
- Laboratório de Espectrometria de Massa, LEM, Embrapa Recursos Genéticos e Biotecnologia, Brasília, DF, Brasil
| | - André M. Murad
- Laboratório de Espectrometria de Massa, LEM, Embrapa Recursos Genéticos e Biotecnologia, Brasília, DF, Brasil
| | - José L. Cardozo Fh
- Laboratório de Espectrometria de Massa, LEM, Embrapa Recursos Genéticos e Biotecnologia, Brasília, DF, Brasil
- Departamento de Fitopatologia, Instituto Mato-Grossense do Algodão, Primavera do Leste, MT, Brasil
| | - José Roberto S. A. Leite
- Núcleo de Pesquisa em Morfologia e Imunologia Aplicada, NuPMIA, Faculdade de Medicina, Campus Universitário Darcy Ribeiro, Universidade de Brasília, Brasília, DF, Brasil
| | - Kelly G. Magalhães
- Laboratório de Imunologia e Inflamação, LIMI, Instituto de Biologia, Universidade de Brasília, Brasília, DF, Brasil
| | - Aline L. Oliveira
- Laboratório de Ressonância Magnética Nuclear, LRMN, Instituto de Química, Universidade de Brasília, Brasília, DF, Brasil
| | - Carlos Bloch
- Laboratório de Espectrometria de Massa, LEM, Embrapa Recursos Genéticos e Biotecnologia, Brasília, DF, Brasil
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21
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Bessa LJ, Manickchand JR, Eaton P, Leite JRSA, Brand GD, Gameiro P. Intragenic Antimicrobial Peptide Hs02 Hampers the Proliferation of Single- and Dual-Species Biofilms of P. aeruginosa and S. aureus: A Promising Agent for Mitigation of Biofilm-Associated Infections. Int J Mol Sci 2019; 20:E3604. [PMID: 31340580 PMCID: PMC6678116 DOI: 10.3390/ijms20143604] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2019] [Revised: 07/12/2019] [Accepted: 07/15/2019] [Indexed: 01/24/2023] Open
Abstract
Pseudomonas aeruginosa and Staphylococcus aureus are two major pathogens involved in a large variety of infections. Their co-occurrence in the same site of infection has been frequently reported and is linked to enhanced virulence and difficulty of treatment. Herein, the antimicrobial and antibiofilm activities of an intragenic antimicrobial peptide (IAP), named Hs02, which was uncovered from the human unconventional myosin 1H protein, were investigated against several P. aeruginosa and S. aureus strains, including multidrug-resistant (MDR) isolates. The antibiofilm activity was evaluated on single- and dual-species biofilms of P. aeruginosa and S. aureus. Moreover, the effect of peptide Hs02 on the membrane fluidity of the strains was assessed through Laurdan generalized polarization (GP). Minimum inhibitory concentration (MIC) values of peptide Hs02 ranged from 2 to 16 μg/mL against all strains and MDR isolates. Though Hs02 was not able to hamper biofilm formation by some strains at sub-MIC values, it clearly affected 24 h preformed biofilms, especially by reducing the viability of the bacterial cells within the single- and dual-species biofilms, as shown by confocal laser scanning microscopy (CLSM) and atomic force microscopy (AFM) images. Laurdan GP values showed that Hs02 induces membrane rigidification in both P. aeruginosa and S. aureus. Peptide Hs02 can potentially be a lead for further improvement as an antibiofilm agent.
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Affiliation(s)
- Lucinda J Bessa
- LAQV/Requimte, Departamento de Química e Bioquímica, Faculdade de Ciências da, Universidade do Porto, 4050-313 Porto, Portugal.
| | - Julia R Manickchand
- Laboratório de Síntese e Análise de Biomoléculas, Instituto de Química, Universidade de Brasília, UnB, Brasília DF 70910-900, Brasil
| | - Peter Eaton
- LAQV/Requimte, Departamento de Química e Bioquímica, Faculdade de Ciências da, Universidade do Porto, 4050-313 Porto, Portugal
| | - José Roberto S A Leite
- Núcleo de Pesquisa em Morfologia e Imunonologia Aplicada, NuPMIA, Área de Morfologia, Faculdade de Medicina, FM, Universidade de Brasília, UnB, Brasília DF 70910-900, Brasil
| | - Guilherme D Brand
- Laboratório de Síntese e Análise de Biomoléculas, Instituto de Química, Universidade de Brasília, UnB, Brasília DF 70910-900, Brasil
| | - Paula Gameiro
- LAQV/Requimte, Departamento de Química e Bioquímica, Faculdade de Ciências da, Universidade do Porto, 4050-313 Porto, Portugal
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22
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Rabbit’s Host Defense Peptide (RSRAH) Protects Mice from Escherichia coli Challenge. Int J Pept Res Ther 2019. [DOI: 10.1007/s10989-018-9694-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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23
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Ning Q. Main Complications of AECHB and Severe Hepatitis B (Liver Failure). ACUTE EXACERBATION OF CHRONIC HEPATITIS B 2019. [PMCID: PMC7498917 DOI: 10.1007/978-94-024-1603-9_2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Qin Ning
- Department of Infectious Disease, Tongji Hospital, Wuhan, China
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24
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Deslouches B, Di YP. Antimicrobial peptides with selective antitumor mechanisms: prospect for anticancer applications. Oncotarget 2018; 8:46635-46651. [PMID: 28422728 PMCID: PMC5542299 DOI: 10.18632/oncotarget.16743] [Citation(s) in RCA: 201] [Impact Index Per Article: 33.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Accepted: 03/20/2017] [Indexed: 02/07/2023] Open
Abstract
In the last several decades, there have been significant advances in anticancer therapy. However, the development of resistance to cancer drugs and the lack of specificity related to actively dividing cells leading to toxic side effects have undermined these achievements. As a result, there is considerable interest in alternative drugs with novel antitumor mechanisms. In addition to the recent approach using immunotherapy, an effective but much cheaper therapeutic option of pharmaceutical drugs would still provide the best choice for cancer patients as the first line treatment. Ribosomally synthesized cationic antimicrobial peptides (AMPs) or host defense peptides (HDP) display broad-spectrum activity against bacteria based on electrostatic interactions with negatively charged lipids on the bacterial surface. Because of increased proportions of phosphatidylserine (negatively charged) on the surface of cancer cells compared to normal cells, cationic amphipathic peptides could be an effective source of anticancer agents that are both selective and refractory to current resistance mechanisms. We reviewed herein the prospect for AMP application to cancer treatment, with a focus on modes of action of cationic AMPs.
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Affiliation(s)
- Berthony Deslouches
- Department of Environmental and Occupational Health, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, PA, USA.,Department of Microbiology and Molecular Genetics, School of Medicine, University of Pittsburgh, Pittsburgh, PA, USA
| | - Y Peter Di
- Department of Environmental and Occupational Health, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, PA, USA
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25
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Jenner ZB, Crittenden CM, Gonzalez M, Brodbelt JS, Bruns KA. Hydrocarbon-stapled lipopeptides exhibit selective antimicrobial activity. Biopolymers 2017; 108. [DOI: 10.1002/bip.23006] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2016] [Revised: 11/22/2016] [Accepted: 11/27/2016] [Indexed: 12/27/2022]
Affiliation(s)
- Zachary B. Jenner
- Department of Chemistry and Biochemistry; Southwestern University; Georgetown Texas 78626
- Department of Microbiology; McGovern Medical School, formerly The University of Texas Health Science Center at Houston (UTHealth) Medical School; Texas 77030
| | | | - Martín Gonzalez
- Department of Biology; Southwestern University; Georgetown Texas 78626
| | | | - Kerry A. Bruns
- Department of Chemistry and Biochemistry; Southwestern University; Georgetown Texas 78626
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26
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Baindara P, Kapoor A, Korpole S, Grover V. Cysteine-rich low molecular weight antimicrobial peptides from Brevibacillus and related genera for biotechnological applications. World J Microbiol Biotechnol 2017; 33:124. [DOI: 10.1007/s11274-017-2291-9] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2017] [Accepted: 05/20/2017] [Indexed: 11/28/2022]
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27
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Antimicrobial Dendrimeric Peptides: Structure, Activity and New Therapeutic Applications. Int J Mol Sci 2017; 18:ijms18030542. [PMID: 28273806 PMCID: PMC5372558 DOI: 10.3390/ijms18030542] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2017] [Revised: 02/15/2017] [Accepted: 02/23/2017] [Indexed: 01/09/2023] Open
Abstract
Microbial resistance to conventional antibiotics is one of the most outstanding medical and scientific challenges of our times. Despite the recognised need for new anti-infective agents, however, very few new drugs have been brought to the market and to the clinic in the last three decades. This review highlights the properties of a new class of antibiotics, namely dendrimeric peptides. These intriguing novel compounds, generally made of multiple peptidic sequences linked to an inner branched core, display an array of antibacterial, antiviral and antifungal activities, usually coupled to low haemolytic activity. In addition, several peptides synthesized in oligobranched form proved to be promising tools for the selective treatment of cancer cells.
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28
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Huwaitat R, McCloskey AP, Gilmore BF, Laverty G. Potential strategies for the eradication of multidrug-resistant Gram-negative bacterial infections. Future Microbiol 2016; 11:955-72. [PMID: 27357521 DOI: 10.2217/fmb-2016-0035] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Antimicrobial resistance is one of the leading threats to society. The increasing burden of multidrug-resistant Gram-negative infection is particularly concerning as such bacteria are demonstrating resistance to nearly all currently licensed therapies. Various strategies have been hypothesized to treat multidrug-resistant Gram-negative infections including: targeting the Gram-negative outer membrane; neutralization of lipopolysaccharide; inhibition of bacterial efflux pumps and prevention of protein folding. Silver and silver nanoparticles, fusogenic liposomes and nanotubes are potential strategies for extending the activity of licensed, Gram-positive selective, antibiotics to Gram-negatives. This may serve as a strategy to fill the current void in pharmaceutical development in the short term. This review outlines the most promising strategies that could be implemented to solve the threat of multidrug-resistant Gram-negative infections.
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Affiliation(s)
- Rawan Huwaitat
- Biofunctional Nanomaterials Group, School of Pharmacy, Queens University of Belfast, Medical Biology Centre, 97 Lisburn Road, Belfast BT9 7BL, UK
| | - Alice P McCloskey
- Biofunctional Nanomaterials Group, School of Pharmacy, Queens University of Belfast, Medical Biology Centre, 97 Lisburn Road, Belfast BT9 7BL, UK
| | - Brendan F Gilmore
- Biofunctional Nanomaterials Group, School of Pharmacy, Queens University of Belfast, Medical Biology Centre, 97 Lisburn Road, Belfast BT9 7BL, UK
| | - Garry Laverty
- Biofunctional Nanomaterials Group, School of Pharmacy, Queens University of Belfast, Medical Biology Centre, 97 Lisburn Road, Belfast BT9 7BL, UK
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29
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Sitohy M, Mahgoub S, Osman A, El-Masry R, Al-Gaby A. Extent and Mode of Action of Cationic Legume Proteins against Listeria monocytogenes and Salmonella Enteritidis. Probiotics Antimicrob Proteins 2016; 5:195-205. [PMID: 26782988 DOI: 10.1007/s12602-013-9134-2] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
The methylated soybean protein and methylated chickpea protein (MSP and MCP) with isoelectric points around pI 8 were prepared by esterifying 83 % of their free carboxyl groups and tested for their interactions with Listeria monocytogenes and Salmonella Enteritidis. The two substances exhibited a concentration-dependent inhibitory action against the two studied bacteria with a minimum inhibitory concentration of about 100 μg/mL. The IC50 % of the two proteins against L. monocytogenes (17 μg/mL) was comparable to penicillin but comparatively much lower (15 μg/mL) than that of penicillin (85 μg/mL) against S. Enteritidis. The two proteins could inhibit the growth of L. monocytogenes and S. Enteritidis by about 97 and 91 %, respectively, after 6-12 h of incubation at 37 °C. The constituting subunits of MSP (methylated 11S and methylated 7S) were both responsible for its antimicrobial action. Transmission electron microscopy of the protein-treated bacteria showed various signs of cellular deformation. The cationic proteins can electrostatically and hydrophobically interact with cell wall and cell membrane, producing large pores, pore channels and cell wall and cell membrane disintegration, engendering higher cell permeability leading finally to cell emptiness, lysis and death.
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Affiliation(s)
- Mahmoud Sitohy
- Biochemistry Department, Faculty of Agriculture, Zagazig University, Zagazig, 44511, Egypt.
| | - Samir Mahgoub
- Microbiology Department, Faculty of Agriculture, Zagazig University, Zagazig, 44511, Egypt
| | - Ali Osman
- Biochemistry Department, Faculty of Agriculture, Zagazig University, Zagazig, 44511, Egypt
| | - Ragab El-Masry
- Biochemistry Department, Faculty of Agriculture, Zagazig University, Zagazig, 44511, Egypt
| | - Aly Al-Gaby
- Biochemistry Department, Faculty of Agriculture, Zagazig University, Zagazig, 44511, Egypt
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30
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North SH, Taitt CR. Application of circular dichroism for structural analysis of surface-immobilized cecropin A interacting with lipoteichoic acid. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:10791-10798. [PMID: 26362347 DOI: 10.1021/acs.langmuir.5b02600] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The development of biomaterials integrating antimicrobial peptides (AMPs) for improved pathogen detection or use as therapeutic agents requires an understanding of how a peptide may behave once immobilized. Here, we use a combination of circular dichroism and capture assays to assess the structure-function relationship of the cationic amphipathic AMP, cecropin A (cecA), upon interaction with Gram-positive lipoteichoic acids (LTAs). In solution, cecA peptides underwent a change from a largely unstructured conformation in water to structures with significant α-helical content in the presence of both Bacillus subtilis and Staphylococcus aureus LTAs. After surface immobilization, cecA peptides attached by either C- or N-terminus were able to capture both LTAs as well as to undergo conformational changes in the presence of SDS similar to those observed in solution. However, in spite of demonstrated LTA binding activity and the ability to undergo conformational changes (i.e., with SDS), no structural changes were observed when cecA immobilized by its N-terminus was treated with either LTA preparation. On the other hand, cecA immobilized by its C-terminus underwent a conformational change in the presence of S. aureus, but not B. subtilis, LTA. These results indicate that after immobilization recognition of different targets by cationic AMPs may occur by mechanisms quite different from those in solution and that selectivity of these mechanisms is further dependent on the orientation of the immobilized peptide.
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Affiliation(s)
- Stella H North
- Center for Biomolecular Science & Engineering, Naval Research Laboratory , 4555 Overlook Avenue, SW, Washington, D.C. 20375, United States
| | - Chris R Taitt
- Center for Biomolecular Science & Engineering, Naval Research Laboratory , 4555 Overlook Avenue, SW, Washington, D.C. 20375, United States
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31
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Meloni M, Candusso S, Galeotti M, Volpatti D. Preliminary study on expression of antimicrobial peptides in European sea bass (Dicentrarchus labrax) following in vivo infection with Vibrio anguillarum. A time course experiment. FISH & SHELLFISH IMMUNOLOGY 2015; 43:82-90. [PMID: 25542381 DOI: 10.1016/j.fsi.2014.12.016] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2014] [Revised: 12/05/2014] [Accepted: 12/15/2014] [Indexed: 06/04/2023]
Abstract
Antimicrobial polypeptides (AMPPs) are humoral components of the vertebrates and invertebrates innate immune system. Their potent broad spectrum antimicrobial activities have drawn the attention of the scientific community to their potential use not only as an alternative to antibiotics but also as functional targets for immunostimulants in order to enhance the host immunity. Fish synthesize a great number of these peptides but in European sea bass, an important fish species in the Mediterranean aquaculture, only a few AMPPs have been studied and these surveys have highlighted their functional role as predictive markers of stressful conditions. Many aspects concerning AMPP mode of action in the host during bacterial infections are still unknown. In this work a 72 h time course experiment, performed on juvenile sea bass intraperitoneally (i.p.) injected with a sub-lethal dose of Vibrio anguillarum, was aimed to investigate the mRNA expression of four specific AMPP genes and interleukin-1β (IL-1β) in skin, gills, spleen, and head kidney. AMPP genes were: dicentracin (DIC), histone-like protein 1 (HLP-1), histone-like protein 2 (HLP-2) and hemoglobin-like protein (Hb-LP). The delta-delta C(T) method in real-time RT-PCR allowed to gain more knowledge about temporal dynamics, preferential sites of expression as well as immunological and physiological role of these molecular markers. DIC was significantly up-regulated mainly in head kidney at 1.5-3 h post-infection (p.i.). HLP-1 showed an extended-time overexpression in gills and a significant up-regulation in spleen. HLP-2 was interestingly overexpressed in gills at 24 h p.i., while Hb-LP showed a significant up-regulation in skin for all the 72 h trial as well as lower but always significant values either in gills or in spleen. Different was the response of IL-1β that showed a dramatic up-regulation in spleen and head kidney at 8 h p.i. whilst in gills it displayed a severe inhibition. During this survey the i.p. stimulus surely conditioned the AMPP expression in skin and gills, especially as regards the DIC that as piscidin-related gene has an important defensive role in the mucosal tissues. However, two unconventional AMPP genes such as HLP-2 and Hb-LP, strictly related to the physiological mechanisms of fish, were less affected in terms of expression by the route of infection, being more evident in peripheral loci. These findings might suggest them as potential markers to be analyzed within plans of health survey in fish farms.
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Affiliation(s)
- Mauro Meloni
- Department of Food Sciences, Section of Veterinary Pathology, University of Udine, via Sondrio 2/A, 33100 Udine, Italy.
| | - Sabrina Candusso
- Department of Food Sciences, Section of Veterinary Pathology, University of Udine, via Sondrio 2/A, 33100 Udine, Italy
| | - Marco Galeotti
- Department of Food Sciences, Section of Veterinary Pathology, University of Udine, via Sondrio 2/A, 33100 Udine, Italy
| | - Donatella Volpatti
- Department of Food Sciences, Section of Veterinary Pathology, University of Udine, via Sondrio 2/A, 33100 Udine, Italy
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32
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Eberle R, Brattig NW, Trusch M, Schlüter H, Achukwi MD, Eisenbarth A, Renz A, Liebau E, Perbandt M, Betzel C. Isolation, identification and functional profile of excretory-secretory peptides from Onchocerca ochengi. Acta Trop 2015; 142:156-66. [PMID: 25479441 DOI: 10.1016/j.actatropica.2014.11.015] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2014] [Revised: 11/19/2014] [Accepted: 11/24/2014] [Indexed: 10/24/2022]
Abstract
Parasitic helminths excrete or secrete a variety of functional molecules into the internal milieu of their mammalian hosts and arthropod vectors which reveal distinct immunomodulatory and other biological activities. We identified and initially characterized the low molecular weight peptide composition of the secretome from the filarial parasite Onchocerca ochengi. A total of 85 peptides were purified by liquid chromatography and further characterized by mass spectrometry. 72 of these peptides were derived from already described Onchocerca proteins and 13 peptide sequences are included in the sequence of uncharacterized proteins. Three peptides, similar to host defense peptides, revealed antibacterial activity. The present analysis confirms the putative involvement of low molecular weight compounds in the parasite-host cross-talk.
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33
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Sharma A, Pohane AA, Bansal S, Bajaj A, Jain V, Srivastava A. Cell penetrating synthetic antimicrobial peptides (SAMPs) exhibiting potent and selective killing of mycobacterium by targeting its DNA. Chemistry 2015; 21:3540-5. [PMID: 25608020 DOI: 10.1002/chem.201404650] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2014] [Revised: 12/09/2014] [Indexed: 01/08/2023]
Abstract
Naturally occurring antimicrobial peptides (AMPs) are powerful defence tools to tackle pathogenic microbes. However, limited natural production and high synthetic costs in addition to poor selectivity limit large-scale use of AMPs in clinical settings. Here, we present a series of synthetic AMPs (SAMPs) that exhibit highly selective and potent killing of Mycobacterium (minimum inhibitory concentration <20 μg mL(-1)) over E. coli or mammalian cells. These SAMPs are active against rapidly multiplying as well as growth saturated Mycobacterium cultures. These SAMPs are not membrane-lytic in nature, and are readily internalized by Mycobacterium and mammalian cells; whereas in E. coli, the lipopolysaccharide layer inhibits their cellular uptake, and hence, their antibacterial action. Upon internalization, these SAMPs interact with the unprotected genomic DNA of mycobacteria, and impede DNA-dependent processes, leading to bacterial cell death.
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Affiliation(s)
- Aashish Sharma
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Indore Bypass Road, Bhauri, Bhopal, 462066 (India)
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Zimmer J, Hobkirk J, Mohamed F, Browning MJ, Stover CM. On the Functional Overlap between Complement and Anti-Microbial Peptides. Front Immunol 2015; 5:689. [PMID: 25646095 PMCID: PMC4298222 DOI: 10.3389/fimmu.2014.00689] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2014] [Accepted: 12/22/2014] [Indexed: 12/19/2022] Open
Abstract
Intriguingly, activated complement and anti-microbial peptides share certain functionalities; lytic, phagocytic, and chemo-attractant activities and each may, in addition, exert cell instructive roles. Each has been shown to have distinct LPS detoxifying activity and may play a role in the development of endotoxin tolerance. In search of the origin of complement, a functional homolog of complement C3 involved in opsonization has been identified in horseshoe crabs. Horseshoe crabs possess anti-microbial peptides able to bind to acyl chains or phosphate groups/saccharides of endotoxin, LPS. Complement activity as a whole is detectable in marine invertebrates. These are also a source of anti-microbial peptides with potential pharmaceutical applicability. Investigating the locality for the production of complement pathway proteins and their role in modulating cellular immune responses are emerging fields. The significance of local synthesis of complement components is becoming clearer from in vivo studies of parenchymatous disease involving specifically generated, complement-deficient mouse lines. Complement C3 is a central component of complement activation. Its provision by cells of the myeloid lineage varies. Their effector functions in turn are increased in the presence of anti-microbial peptides. This may point to a potentiating range of activities, which should serve the maintenance of health but may also cause disease. Because of the therapeutic implications, this review will consider closely studies dealing with complement activation and anti-microbial peptide activity in acute inflammation (e.g., dialysis-related peritonitis, appendicitis, and ischemia).
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Affiliation(s)
- Jana Zimmer
- Department of Infectious Diseases - Medical Microbiology and Hygiene, Ruprecht-Karls-University of Heidelberg , Heidelberg , Germany
| | - James Hobkirk
- Department of Academic Endocrinology, Diabetes and Metabolism, Hull York Medical School, University of Hull , Hull , UK
| | - Fatima Mohamed
- Department of Infection, Immunity and Inflammation, University of Leicester , Leicester , UK
| | - Michael J Browning
- Department of Infection, Immunity and Inflammation, University of Leicester , Leicester , UK ; Department of Immunology, Leicester Royal Infirmary , Leicester , UK
| | - Cordula M Stover
- Department of Infection, Immunity and Inflammation, University of Leicester , Leicester , UK
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New amphiphilic neamine derivatives active against resistant Pseudomonas aeruginosa and their interactions with lipopolysaccharides. Antimicrob Agents Chemother 2014; 58:4420-30. [PMID: 24867965 DOI: 10.1128/aac.02536-13] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
The development of novel antimicrobial agents is urgently required to curb the widespread emergence of multidrug-resistant bacteria like colistin-resistant Pseudomonas aeruginosa. We previously synthesized a series of amphiphilic neamine derivatives active against bacterial membranes, among which 3',6-di-O-[(2"-naphthyl)propyl]neamine (3',6-di2NP), 3',6-di-O-[(2"-naphthyl)butyl]neamine (3',6-di2NB), and 3',6-di-O-nonylneamine (3',6-diNn) showed high levels of activity and low levels of cytotoxicity (L. Zimmermann et al., J. Med. Chem. 56:7691-7705, 2013). We have now further characterized the activity of these derivatives against colistin-resistant P. aeruginosa and studied their mode of action; specifically, we characterized their ability to interact with lipopolysaccharide (LPS) and to alter the bacterial outer membrane (OM). The three amphiphilic neamine derivatives were active against clinical colistin-resistant strains (MICs, about 2 to 8 μg/ml), The most active one (3',6-diNn) was bactericidal at its MIC and inhibited biofilm formation at 2-fold its MIC. They cooperatively bound to LPSs, increasing the outer membrane permeability. Grafting long and linear alkyl chains (nonyl) optimized binding to LPS and outer membrane permeabilization. The effects of amphiphilic neamine derivatives on LPS micelles suggest changes in the cross-bridging of lipopolysaccharides and disordering in the hydrophobic core of the micelles. The molecular shape of the 3',6-dialkyl neamine derivatives induced by the nature of the grafted hydrophobic moieties (naphthylalkyl instead of alkyl) and the flexibility of the hydrophobic moiety are critical for their fluidifying effect and their ability to displace cations bridging LPS. Results from this work could be exploited for the development of new amphiphilic neamine derivatives active against colistin-resistant P. aeruginosa.
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36
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The role of biophysical parameters in the antilipopolysaccharide activities of antimicrobial peptides from marine fish. Mar Drugs 2014; 12:1471-94. [PMID: 24633250 PMCID: PMC3967222 DOI: 10.3390/md12031471] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2014] [Revised: 03/03/2014] [Accepted: 03/03/2014] [Indexed: 01/03/2023] Open
Abstract
Numerous antimicrobial peptides (AMPs) from marine fish have been identified, isolated and characterized. These peptides act as host defense molecules that exert antimicrobial effects by targeting the lipopolysaccharide (LPS) of Gram-negative bacteria. The LPS-AMP interactions are driven by the biophysical properties of AMPs. In this review, therefore, we will focus on the physiochemical properties of AMPs; that is, the contributions made by their sequences, net charge, hydrophobicity and amphipathicity to their mechanism of action. Moreover, the interactions between LPS and fish AMPs and the structure of fish AMPs with LPS bound will also be discussed. A better understanding of the biophysical properties will be useful in the design of AMPs effective against septic shock and multidrug-resistant bacterial strains, including those that commonly produce wound infections.
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López-Abarrategui C, Del Monte-Martínez A, Reyes-Acosta O, Franco OL, Otero-González AJ. LPS inmobilization on porous and non-porous supports as an approach for the isolation of anti-LPS host-defense peptides. Front Microbiol 2013; 4:389. [PMID: 24409171 PMCID: PMC3865429 DOI: 10.3389/fmicb.2013.00389] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2013] [Accepted: 11/29/2013] [Indexed: 12/20/2022] Open
Abstract
Lipopolysaccharides (LPSs) are the major molecular component of the outer membrane of Gram-negative bacteria. This molecule is recognized as a sign of bacterial infection, responsible for the development of local inflammatory response and, in extreme cases, septic shock. Unfortunately, despite substantial advances in the pathophysiology of sepsis, there is no efficacious therapy against this syndrome yet. As a consequence, septic shock syndrome continues to increase, reaching mortality rates over 50% in some cases. Even though many preclinical studies and clinical trials have been conducted, there is no Food and Drug Administration-approved drug yet that interacts directly against LPS. Cationic host-defense peptides (HDPs) could be an alternative solution since they possess both antimicrobial and antiseptic properties. HDPs are small, positively charged peptides which are evolutionarily conserved components of the innate immune response. In fact, binding to diverse chemotypes of LPS and inhibition of LPS-induced pro-inflammatory cytokines from macrophages have been demonstrated for different HDPs. Curiously, none of them have been isolated by their affinity to LPS. A diversity of supports could be useful for such biological interaction and suitable for isolating HDPs that recognize LPS. This approach could expand the rational search for anti-LPS HDPs.
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Affiliation(s)
| | | | | | - Octavio L Franco
- Centro de Análises Proteômicas e Bioquímicas, Programa de Pós-Graduação em Ciências Genômicas e Biotecnologia, Universidade Católica de Brasília Brasília, Brazil
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Martínez-Sernández V, Mezo M, González-Warleta M, Perteguer MJ, Muiño L, Guitián E, Gárate T, Ubeira FM. The MF6p/FhHDM-1 major antigen secreted by the trematode parasite Fasciola hepatica is a heme-binding protein. J Biol Chem 2013; 289:1441-56. [PMID: 24280214 DOI: 10.1074/jbc.m113.499517] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Blood-feeding parasites have developed biochemical mechanisms to control heme intake and detoxification. Here we show that a major antigen secreted by Fasciola hepatica, previously reported as MF6p, of unknown function (gb|CCA61804.1), and as FhHDM-1, considered to be a helminth defense molecule belonging to the family of cathelicidin-like proteins (gb|ADZ24001.1), is in fact a heme-binding protein. The heme-binding nature of the MF6p/FhHDM-1 protein was revealed in two independent experiments: (i) immunopurification of the secreted protein·heme complexes with mAb MF6 and subsequent analysis by C8 reversed-phase HPLC and MS/MS spectrometry and (ii) analysis of the binding ability of the synthetic protein to hemin in vitro. By immunohistochemistry analysis, we have observed that MF6p/FhHDM-1 is produced by parenchymal cells and transported to other tissues (e.g. vitellaria and testis). Interestingly, MF6p/FhHDM-1 is absent both in the intestinal cells and in the lumen of cecum, but it can be released through the tegumental surface to the external medium, where it binds to free heme molecules regurgitated by the parasite after hemoglobin digestion. Proteins that are close analogs of the Fasciola MF6p/FhHDM-1 are present in other trematodes, including Clonorchis, Opistorchis, Paragonimus, Schistosoma, and Dicrocoelium. Using UV-visible spectroscopy and immunoprecipitation techniques, we observed that synthetic MF6p/FhHDM-1 binds to hemin with 1:1 stoichiometry and an apparent Kd of 1.14 × 10(-6) M(-1). We also demonstrated that formation of synthetic MF6p/FhHDM-1·hemin complexes inhibited hemin degradation by hydrogen peroxide and hemin peroxidase-like activity in vitro. Our results suggest that MF6p/FhHDM-1 may be involved in heme homeostasis in trematodes.
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Affiliation(s)
- Victoria Martínez-Sernández
- From the Laboratorio de Parasitología, Facultad de Farmacia, Universidad de Santiago de Compostela, 15782 Santiago de Compostela, Spain
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Enhanced Interaction of Shuffled Mutacin IV, an Antimicrobial Peptide of Bacterial Origin, with Surface Protein IsdB of Staphylococcus aureus. Int J Pept Res Ther 2013. [DOI: 10.1007/s10989-013-9368-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Robinson MW, Dalton JP, O’Brien BA, Donnelly S. Fasciola hepatica: The therapeutic potential of a worm secretome. Int J Parasitol 2013; 43:283-91. [DOI: 10.1016/j.ijpara.2012.11.004] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2012] [Revised: 11/05/2012] [Accepted: 11/06/2012] [Indexed: 12/23/2022]
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Preclinical investigations reveal the broad-spectrum neutralizing activity of peptide Pep19-2.5 on bacterial pathogenicity factors. Antimicrob Agents Chemother 2013; 57:1480-7. [PMID: 23318793 DOI: 10.1128/aac.02066-12] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Bacterial infections are known to cause severe health-threatening conditions, including sepsis. All attempts to get this disease under control failed in the past, and especially in times of increasing antibiotic resistance, this leads to one of the most urgent medical challenges of our times. We designed a peptide to bind with high affinity to endotoxins, one of the most potent pathogenicity factors involved in triggering sepsis. The peptide Pep19-2.5 reveals high endotoxin neutralization efficiency in vitro, and here, we demonstrate its antiseptic/anti-inflammatory effects in vivo in the mouse models of endotoxemia, bacteremia, and cecal ligation and puncture, as well as in an ex vivo model of human tissue. Furthermore, we show that Pep19-2.5 can bind and neutralize not only endotoxins but also other bacterial pathogenicity factors, such as those from the Gram-positive bacterium Staphylococcus aureus. This broad neutralization efficiency and the additive action of the peptide with common antibiotics makes it an exceptionally appropriate drug candidate against bacterial sepsis and also offers multiple other medication opportunities.
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Extracellular vesicles from parasitic helminths contain specific excretory/secretory proteins and are internalized in intestinal host cells. PLoS One 2012; 7:e45974. [PMID: 23029346 PMCID: PMC3454434 DOI: 10.1371/journal.pone.0045974] [Citation(s) in RCA: 251] [Impact Index Per Article: 20.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2012] [Accepted: 08/23/2012] [Indexed: 11/30/2022] Open
Abstract
The study of host-parasite interactions has increased considerably in the last decades, with many studies focusing on the identification of parasite molecules (i.e. surface or excretory/secretory proteins (ESP)) as potential targets for new specific treatments and/or diagnostic tools. In parallel, in the last few years there have been significant advances in the field of extracellular vesicles research. Among these vesicles, exosomes of endocytic origin, with a characteristic size ranging from 30–100 nm, carry several atypical secreted proteins in different organisms, including parasitic protozoa. Here, we present experimental evidence for the existence of exosome-like vesicles in parasitic helminths, specifically the trematodes Echinostoma caproni and Fasciola hepatica. These microvesicles are actively released by the parasites and are taken up by host cells. Trematode extracellular vesicles contain most of the proteins previously identified as components of ESP, as confirmed by proteomic, immunogold labeling and electron microscopy studies. In addition to parasitic proteins, we also identify host proteins in these structures. The existence of extracellular vesicles explains the secretion of atypical proteins in trematodes, and the demonstration of their uptake by host cells suggests an important role for these structures in host-parasite communication, as described for other infectious agents.
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Cotton S, Donnelly S, Robinson MW, Dalton JP, Thivierge K. Defense peptides secreted by helminth pathogens: antimicrobial and/or immunomodulator molecules? Front Immunol 2012; 3:269. [PMID: 22973271 PMCID: PMC3428582 DOI: 10.3389/fimmu.2012.00269] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2012] [Accepted: 08/07/2012] [Indexed: 01/08/2023] Open
Abstract
Host defense peptides (HDPs) are an evolutionarily conserved component of the innate immune response found in all living species. They possess antimicrobial activities against a broad range of organisms including bacteria, fungi, eukaryotic parasites, and viruses. HDPs also have the ability to enhance immune responses by acting as immunomodulators. We discovered a new family of HDPs derived from pathogenic helminth (worms) that cause enormous disease in animals and humans worldwide. The discovery of these peptides was based on their similar biochemical and functional characteristics to the human defense peptide LL-37. We propose that these new peptides modulate the immune response via molecular mimicry of mammalian HDPs thus providing a mechanism behind the anti-inflammatory properties of helminth infections.
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Affiliation(s)
- Sophie Cotton
- Institute of Parasitology, McGill University, Sainte-Anne-de-Bellevue QC, Canada
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Reddy BY, Jow T, Hantash BM. Bioactive oligopeptides in dermatology: Part II. Exp Dermatol 2012; 21:569-75. [DOI: 10.1111/j.1600-0625.2012.01527.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/06/2012] [Indexed: 12/01/2022]
Affiliation(s)
- Bobby Y. Reddy
- Department of Dermatology; New Jersey Medical School; Newark; NJ; USA
| | - Tiffany Jow
- Department of Dermatology; New Jersey Medical School; Newark; NJ; USA
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Silva ON, Mulder KCL, Barbosa AEAD, Otero-Gonzalez AJ, Lopez-Abarrategui C, Rezende TMB, Dias SC, Franco OL. Exploring the pharmacological potential of promiscuous host-defense peptides: from natural screenings to biotechnological applications. Front Microbiol 2011; 2:232. [PMID: 22125552 PMCID: PMC3222093 DOI: 10.3389/fmicb.2011.00232] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2011] [Accepted: 11/01/2011] [Indexed: 02/02/2023] Open
Abstract
In the last few years, the number of bacteria with enhanced resistance to conventional antibiotics has dramatically increased. Most of such bacteria belong to regular microbial flora, becoming a real challenge, especially for immune-depressed patients. Since the treatment is sometimes extremely expensive, and in some circumstances completely inefficient for the most severe cases, researchers are still determined to discover novel compounds. Among them, host-defense peptides (HDPs) have been found as the first natural barrier against microorganisms in nearly all living groups. This molecular class has been gaining attention every day for multiple reasons. For decades, it was believed that these defense peptides had been involved only with the permeation of the lipid bilayer in pathogen membranes, their main target. Currently, it is known that these peptides can bind to numerous targets, as well as lipids including proteins and carbohydrates, from the surface to deep within the cell. Moreover, by using in vivo models, it was shown that HDPs could act both in pathogens and cognate hosts, improving immunological functions as well as acting through multiple pathways to control infections. This review focuses on structural and functional properties of HDP peptides and the additional strategies used to select them. Furthermore, strategies to avoid problems in large-scale manufacture by using molecular and biochemical techniques will also be explored. In summary, this review intends to construct a bridge between academic research and pharmaceutical industry, providing novel insights into the utilization of HDPs against resistant bacterial strains that cause infections in humans.
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Affiliation(s)
- Osmar N Silva
- Programa de Pós-Graduação em Ciências Genômicas e Biotecnologia, Centro de Análises Protômicas e Bioquímicas, Universidade Católica de Brasília Brasília, Brazil
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Robinson MW, Donnelly S, Hutchinson AT, To J, Taylor NL, Norton RS, Perugini MA, Dalton JP. A family of helminth molecules that modulate innate cell responses via molecular mimicry of host antimicrobial peptides. PLoS Pathog 2011; 7:e1002042. [PMID: 21589904 PMCID: PMC3093369 DOI: 10.1371/journal.ppat.1002042] [Citation(s) in RCA: 104] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2010] [Accepted: 03/15/2011] [Indexed: 01/01/2023] Open
Abstract
Over the last decade a significant number of studies have highlighted the central role of host antimicrobial (or defence) peptides in modulating the response of innate immune cells to pathogen-associated ligands. In humans, the most widely studied antimicrobial peptide is LL-37, a 37-residue peptide containing an amphipathic helix that is released via proteolytic cleavage of the precursor protein CAP18. Owing to its ability to protect against lethal endotoxaemia and clinically-relevant bacterial infections, LL-37 and its derivatives are seen as attractive candidates for anti-sepsis therapies. We have identified a novel family of molecules secreted by parasitic helminths (helminth defence molecules; HDMs) that exhibit similar biochemical and functional characteristics to human defence peptides, particularly CAP18. The HDM secreted by Fasciola hepatica (FhHDM-1) adopts a predominantly α-helical structure in solution. Processing of FhHDM-1 by F. hepatica cathepsin L1 releases a 34-residue C-terminal fragment containing a conserved amphipathic helix. This is analogous to the proteolytic processing of CAP18 to release LL-37, which modulates innate cell activation by classical toll-like receptor (TLR) ligands such as lipopolysaccharide (LPS). We show that full-length recombinant FhHDM-1 and a peptide analogue of the amphipathic C-terminus bind directly to LPS in a concentration-dependent manner, reducing its interaction with both LPS-binding protein (LBP) and the surface of macrophages. Furthermore, FhHDM-1 and the amphipathic C-terminal peptide protect mice against LPS-induced inflammation by significantly reducing the release of inflammatory mediators from macrophages. We propose that HDMs, by mimicking the function of host defence peptides, represent a novel family of innate cell modulators with therapeutic potential in anti-sepsis treatments and prevention of inflammation.
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Affiliation(s)
- Mark W Robinson
- Infection, Immunity and Innovation (i3) Institute, University of Technology Sydney (UTS), Ultimo, Sydney, Australia.
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Cationic amphiphiles, a new generation of antimicrobials inspired by the natural antimicrobial peptide scaffold. Antimicrob Agents Chemother 2010; 54:4049-58. [PMID: 20696877 DOI: 10.1128/aac.00530-10] [Citation(s) in RCA: 232] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Naturally occurring cationic antimicrobial peptides (AMPs) and their mimics form a diverse class of antibacterial agents currently validated in preclinical and clinical settings for the treatment of infections caused by antimicrobial-resistant bacteria. Numerous studies with linear, cyclic, and diastereomeric AMPs have strongly supported the hypothesis that their physicochemical properties, rather than any specific amino acid sequence, are responsible for their microbiological activities. It is generally believed that the amphiphilic topology is essential for insertion into and disruption of the cytoplasmic membrane. In particular, the ability to rapidly kill bacteria and the relative difficulty with which bacteria develop resistance make AMPs and their mimics attractive targets for drug development. However, the therapeutic use of naturally occurring AMPs is hampered by the high manufacturing costs, poor pharmacokinetic properties, and low bacteriological efficacy in animal models. In order to overcome these problems, a variety of novel and structurally diverse cationic amphiphiles that mimic the amphiphilic topology of AMPs have recently appeared. Many of these compounds exhibit superior pharmacokinetic properties and reduced in vitro toxicity while retaining potent antibacterial activity against resistant and nonresistant bacteria. In summary, cationic amphiphiles promise to provide a new and rich source of diverse antibacterial lead structures in the years to come.
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Bruschi M, Pirri G, Giuliani A, Nicoletto SF, Baster I, Scorciapino MA, Casu M, Rinaldi AC. Synthesis, characterization, antimicrobial activity and LPS-interaction properties of SB041, a novel dendrimeric peptide with antimicrobial properties. Peptides 2010; 31:1459-67. [PMID: 20438783 DOI: 10.1016/j.peptides.2010.04.022] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/01/2010] [Revised: 04/26/2010] [Accepted: 04/26/2010] [Indexed: 10/19/2022]
Abstract
Multimeric peptides offer several advantages with respect to their monomeric counterparts, as increased activity and greater stability to peptidases and proteases. SB041 is a novel antimicrobial peptide with dendrimeric structure; it is a tetramer of pyrEKKIRVRLSA linked by a lysine core, with an amino valeric acid chain. Here, we report on its synthesis, NMR characterization, antimicrobial activity, and LPS-interaction properties. The peptide was especially active against Gram-negative strains, with a potency comparable (on molar basis) to that of lipopeptides colistin and polymixin B, but it also displayed some activity against selected Gram-positive strains. Following these indications, we investigated the efficacy of SB041 in binding Escherichia coli and Pseudomonas aeruginosa LPS in vitro and counteracting its biological effects in RAW-Blue cells, derived from RAW 264.7 macrophages. SB041 strongly bound purified LPS, especially that of E. coli, as proved by fluorescent displacement assay, and readily penetrated into LPS monolayers. However, the killing activity of SB041 against E. coli was not inhibited by increasing concentrations of LPS added to the medium. Checking the SB041 effect on LPS-induced activation of pattern recognition receptors (PRRs) in Raw-Blue cells revealed that while the peptide gave a statistically significant decrease in PRRs stimulation when RAW-Blue cells were challenged with P. aeruginosa LPS, the same was not seen when E. coli LPS was used to activate innate immune defense-like responses. Thus, as previously seen for other antimicrobial peptides, also for SB041 binding to LPS did not translate necessarily into LPS-neutralizing activity, suggesting that SB041-LPS interactions must be of complex nature.
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Affiliation(s)
- Michela Bruschi
- Research & Development Unit, Spider Biotech S.r.l., I-10010 Colleretto Giacosa (TO), Italy
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