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Berida TI, Adekunle YA, Dada-Adegbola H, Kdimy A, Roy S, Sarker SD. Plant antibacterials: The challenges and opportunities. Heliyon 2024; 10:e31145. [PMID: 38803958 PMCID: PMC11128932 DOI: 10.1016/j.heliyon.2024.e31145] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Revised: 05/09/2024] [Accepted: 05/10/2024] [Indexed: 05/29/2024] Open
Abstract
Nature possesses an inexhaustible reservoir of agents that could serve as alternatives to combat the growing threat of antimicrobial resistance (AMR). While some of the most effective drugs for treating bacterial infections originate from natural sources, they have predominantly been derived from fungal and bacterial species. However, a substantial body of literature is available on the promising antibacterial properties of plant-derived compounds. In this comprehensive review, we address the major challenges associated with the discovery and development of plant-derived antimicrobial compounds, which have acted as obstacles preventing their clinical use. These challenges encompass limited sourcing, the risk of agent rediscovery, suboptimal drug metabolism, and pharmacokinetics (DMPK) properties, as well as a lack of knowledge regarding molecular targets and mechanisms of action, among other pertinent issues. Our review underscores the significance of these challenges and their implications in the quest for the discovery and development of effective plant-derived antimicrobial agents. Through a critical examination of the current state of research, we give valuable insights that will advance our understanding of these classes of compounds, offering potential solutions to the global crisis of AMR. © 2017 Elsevier Inc. All rights reserved.
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Affiliation(s)
- Tomayo I. Berida
- Department of BioMolecular Sciences, Division of Pharmacognosy, University of Mississippi, University, MS, 38677, USA
| | - Yemi A. Adekunle
- Department of Pharmaceutical and Medicinal Chemistry, College of Pharmacy, Afe Babalola University, Ado-Ekiti, Nigeria
- Centre for Natural Products Discovery (CNPD), School of Pharmacy and Biomolecular Sciences, Liverpool John Moores University, James Parsons Building, Byrom Street, Liverpool, L3 3AF, United Kingdom
| | - Hannah Dada-Adegbola
- Department of Medical Microbiology and Parasitology, College of Medicine, University of Ibadan, Ibadan, Nigeria
| | - Ayoub Kdimy
- LS3MN2E, CERNE2D, Faculty of Science, Mohammed V University in Rabat, Rabat, 10056, Morocco
| | - Sudeshna Roy
- Department of BioMolecular Sciences, Division of Pharmacognosy, University of Mississippi, University, MS, 38677, USA
| | - Satyajit D. Sarker
- Centre for Natural Products Discovery (CNPD), School of Pharmacy and Biomolecular Sciences, Liverpool John Moores University, James Parsons Building, Byrom Street, Liverpool, L3 3AF, United Kingdom
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Gupta V, Datta P. Next-generation strategy for treating drug resistant bacteria: Antibiotic hybrids. Indian J Med Res 2019; 149:97-106. [PMID: 31219074 PMCID: PMC6563750 DOI: 10.4103/ijmr.ijmr_755_18] [Citation(s) in RCA: 52] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Resistance against nearly all antibiotics used clinically have been documented in bacteria. There is an ever-increasing danger caused by multidrug-resistant Gram-negative bacteria in both hospital and community settings. In Gram-negative bacteria, intrinsic resistance to currently available antibiotics is mainly due to overexpressed efflux pumps which are constitutively present and also presence of protective outer membrane. Combination therapy, i.e., use of two or more antibiotics, was thought to be an effective strategy because it took advantage of the additive effects of multiple antimicrobial mechanisms, lower risk of resistance development and lower mortality and improved clinical outcome. However, none of the benefits were seen in in vivo studies. Antibiotic hybrids are being used to challenge the growing drug resistance threat and increase the usefulness of current antibiotic arsenal. Antibiotic hybrids are synthetic constructs of two molecules which are covalently linked. These could be two antibiotics or antibiotic with an adjuvant (efflux pump inhibitor, siderophore, etc.) which increases the access of the antibiotics to the target. The concepts, developments and challenges in the future use of antibiotic hybrids are discussed here. Majority of the studies have been conducted on fluoroquinolones and aminoglycosides molecules. The antibiotic tobramycin has the property to enhance the action of antimicrobial agents against which the multidrug-resistant Gram-negative bacteria were earlier resistant, and thus potentiating the action of legacy antibiotics. Antibiotic hybrids may have a role as the silver bullet in Gram-negative bacteria to overcome drug resistance as well as extend the spectrum of existing antibiotics.
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Affiliation(s)
- Varsha Gupta
- Department of Microbiology, Government Medical College Hospital, Chandigarh, India
| | - Priya Datta
- Department of Microbiology, Government Medical College Hospital, Chandigarh, India
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Ciumac D, Gong H, Hu X, Lu JR. Membrane targeting cationic antimicrobial peptides. J Colloid Interface Sci 2019; 537:163-185. [DOI: 10.1016/j.jcis.2018.10.103] [Citation(s) in RCA: 123] [Impact Index Per Article: 24.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2018] [Revised: 10/29/2018] [Accepted: 10/30/2018] [Indexed: 01/13/2023]
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Antibiotic Hybrids: the Next Generation of Agents and Adjuvants against Gram-Negative Pathogens? Clin Microbiol Rev 2018. [PMID: 29540434 DOI: 10.1128/cmr.00077-17] [Citation(s) in RCA: 171] [Impact Index Per Article: 28.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
The global incidence of drug-resistant Gram-negative bacillary infections has been increasing, and there is a dire need to develop novel strategies to overcome this problem. Intrinsic resistance in Gram-negative bacteria, such as their protective outer membrane and constitutively overexpressed efflux pumps, is a major survival weapon that renders them refractory to current antibiotics. Several potential avenues to overcome this problem have been at the heart of antibiotic drug discovery in the past few decades. We review some of these strategies, with emphasis on antibiotic hybrids either as stand-alone antibacterial agents or as adjuvants that potentiate a primary antibiotic in Gram-negative bacteria. Antibiotic hybrid is defined in this review as a synthetic construct of two or more pharmacophores belonging to an established agent known to elicit a desired antimicrobial effect. The concepts, advances, and challenges of antibiotic hybrids are elaborated in this article. Moreover, we discuss several antibiotic hybrids that were or are in clinical evaluation. Mechanistic insights into how tobramycin-based antibiotic hybrids are able to potentiate legacy antibiotics in multidrug-resistant Gram-negative bacilli are also highlighted. Antibiotic hybrids indeed have a promising future as a therapeutic strategy to overcome drug resistance in Gram-negative pathogens and/or expand the usefulness of our current antibiotic arsenal.
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Obeng EM, Dullah EC, Razak NSA, Danquah MK, Budiman C, Ongkudon CM. Elucidating endotoxin-biomolecule interactions with FRET: extending the frontiers of their supramolecular complexation. J Biol Methods 2017; 4:e71. [PMID: 31453229 PMCID: PMC6706125 DOI: 10.14440/jbm.2017.172] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2016] [Revised: 01/24/2017] [Accepted: 02/28/2017] [Indexed: 01/22/2023] Open
Abstract
Endotoxin has been one of the topical chemical contaminants of major concern to researchers, especially in the field of bioprocessing. This major concern of researchers stems from the fact that the presence of Gram-negative bacterial endotoxin in intracellular products is unavoidable and requires complex downstream purification steps. For instance, endotoxin interacts with recombinant proteins, peptides, antibodies and aptamers and these interactions have formed the foundation for most biosensors for endotoxin detection. It has become imperative for researchers to engineer reliable means/techniques to detect, separate and remove endotoxin, without compromising the quality and quantity of the end-product. However, the underlying mechanism involved during endotoxin-biomolecule interaction is still a gray area. The use of quantitative molecular microscopy that provides high resolution of biomolecules is highly promising, hence, may lead to the development of improved endotoxin detection strategies in biomolecule preparation. Förster resonance energy transfer (FRET) spectroscopy is one of the emerging most powerful tools compatible with most super-resolution techniques for the analysis of molecular interactions. However, the scope of FRET has not been well-exploited in the analysis of endotoxin-biomolecule interaction. This article reviews endotoxin, its pathophysiological consequences and the interaction with biomolecules. Herein, we outline the common potential ways of using FRET to extend the current understanding of endotoxin-biomolecule interaction with the inference that a detailed understanding of the interaction is a prerequisite for the design of strategies for endotoxin identification and removal from protein milieus.
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Affiliation(s)
- Eugene M Obeng
- Biotechnology Research Institute, University Malaysia Sabah, Kota Kinabalu, Sabah 88400, Malaysia
| | - Elvina C Dullah
- Biotechnology Research Institute, University Malaysia Sabah, Kota Kinabalu, Sabah 88400, Malaysia
| | | | - Michael K Danquah
- Department of Chemical Engineering, Curtin University Sarawak, Miri, Sarawak 98009, Malaysia
| | - Cahyo Budiman
- Biotechnology Research Institute, University Malaysia Sabah, Kota Kinabalu, Sabah 88400, Malaysia
| | - Clarence M Ongkudon
- Biotechnology Research Institute, University Malaysia Sabah, Kota Kinabalu, Sabah 88400, Malaysia
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Silver LL. A Gestalt approach to Gram-negative entry. Bioorg Med Chem 2016; 24:6379-6389. [DOI: 10.1016/j.bmc.2016.06.044] [Citation(s) in RCA: 112] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2016] [Revised: 06/12/2016] [Accepted: 06/22/2016] [Indexed: 01/01/2023]
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Goswami S, Thiyagarajan D, Samanta S, Das G, Ramesh A. A zinc complex of a neutral pyridine-based amphiphile: a highly efficient and potentially therapeutic bactericidal material. J Mater Chem B 2015; 3:7068-7078. [DOI: 10.1039/c5tb01259g] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The complexation of Zn(ii) with a neutral pyridine-based amphiphile generates a potent bactericidal material for potential antibacterial and antibiofilm therapy.
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Affiliation(s)
- Sudeep Goswami
- Department of Biosciences and Bioengineering
- Indian Institute of Technology Guwahati
- Guwahati 781039
- India
| | - Durairaj Thiyagarajan
- Department of Biosciences and Bioengineering
- Indian Institute of Technology Guwahati
- Guwahati 781039
- India
| | - Soham Samanta
- Department of Chemistry
- Indian Institute of Technology Guwahati
- Guwahati 781039
- India
| | - Gopal Das
- Department of Chemistry
- Indian Institute of Technology Guwahati
- Guwahati 781039
- India
| | - Aiyagari Ramesh
- Department of Biosciences and Bioengineering
- Indian Institute of Technology Guwahati
- Guwahati 781039
- India
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Gutman J, Herzberg M, Walker SL. Biofouling of reverse osmosis membranes: positively contributing factors of Sphingomonas. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2014; 48:13941-13950. [PMID: 25354089 DOI: 10.1021/es503680s] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
In the present study, we investigate the possible contribution of Sphingomonas spp. glycosphingolipids (GSL) and its extracellular polymeric substances (EPS) to the initial colonization and development of biofilm bodies on reverse osmosis (RO) membranes. A combination of an RO cross-flow membrane lab unit, a quartz crystal microbalance with dissipation (QCM-D), and a rear stagnation point flow (RSPF) system with either model bacteria (Sphingomonas wittichii, Escherichia coli, and Pseudomonas aeruginosa) or vesicles made of the bacterial GSL or LPS was used. Results showed noticeable differences in the adhesion LPS versus GSL vesicles in the QCM-D, with the latter exhibiting 50% higher adhesion to polyamide coated crystals (mimicking an RO membrane surface). A similar trend was observed for EPS extracted from S. wittichii, when compared to the adhesion tendency of EPS extracted from P. aeruginosa. By applying the whole-cell approach in the RO lab unit, the cumulative impact of S. wittichii cells composing GSL and probably their EPS reduced the permeate flux during bacterial accumulation on the membrane surface. Experiments were conducted with the same amount of Sphingomonas spp. or Escherichia coli cells resulting in a two times greater flux decline in the presence of S. wittichii. The distinct effects of Sphingomonas spp. on RO membrane biofouling are likely a combination of GSL presence (known for enhancing adhesion when compared to non-GSL containing bacteria) and the EPS contributing to the overall strength of the biofilm matrix.
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Affiliation(s)
- Jenia Gutman
- Department of Desalination and Water Treatment, Zuckerberg Institute for Water Research, Albert Katz International School for Desert Studies, Jacob Blaustein Institutes for Desert Research, Ben Gurion University of the Negev , Sede Boqer Campus 84990, Israel
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Correa W, Manrique-Moreno M, Behrends J, Patiño E, Marella C, Peláez-Jaramillo C, Garidel P, Gutsmann T, Brandenburg K, Heinbockel L. Galleria mellonella native and analogue peptides Gm1 and ΔGm1. II) Anti-bacterial and anti-endotoxic effects. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2014; 1838:2739-44. [DOI: 10.1016/j.bbamem.2014.07.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2013] [Revised: 06/25/2014] [Accepted: 07/01/2014] [Indexed: 10/25/2022]
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Wytrwal M, Bednar J, Nowakowska M, Wydro P, Kepczynski M. Interactions of serum with polyelectrolyte-stabilized liposomes: Cryo-TEM studies. Colloids Surf B Biointerfaces 2014; 120:152-9. [DOI: 10.1016/j.colsurfb.2014.02.040] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2013] [Revised: 02/13/2014] [Accepted: 02/22/2014] [Indexed: 11/27/2022]
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Correa W, Manrique-Moreno M, Patiño E, Peláez-Jaramillo C, Kaconis Y, Gutsmann T, Garidel P, Heinbockel L, Brandenburg K. Galleria mellonella native and analogue peptides Gm1 and ΔGm1. I) biophysical characterization of the interaction mechanisms with bacterial model membranes. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2014; 1838:2728-38. [PMID: 25017800 DOI: 10.1016/j.bbamem.2014.07.006] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2013] [Revised: 04/29/2014] [Accepted: 07/01/2014] [Indexed: 10/25/2022]
Abstract
Natural occurring antimicrobial peptides (AMPs) are important components of the innate immune system of animals and plants. They are considered to be promising alternatives to conventional antibiotics. Here we present a comparative study of two synthetic peptides: Gm1, corresponding to the natural overall uncharged peptide from Galleria mellonella (Gm) and ΔGm1, a modified overall positively charged Gm1 variant. We have studied the interaction of the peptides with lipid membranes composed of different kinds of lipopolysaccharides (LPS) and dimyristoylphosphatidylglycerol (DMPG), in some cases also dimyristoylphosphatidylethanolamine (DMPE) as representative lipid components of Gram-negative bacterial membranes, by applying Fourier-transform infrared spectroscopy (FTIR), Förster resonance energy transfer spectroscopy (FRET), differential scanning calorimetry (DSC) and isothermal titration calorimetry (ITC). Gm1 generates a destabilizing effect on the gel to liquid crystalline phase transition of the acyl chains of the lipids, as deduced from a decrease in the phase transition temperature and enthalpy, suggesting a fluidization, whereas ΔGm1 led to the opposite behavior. Further, FTIR analysis of the functional groups of the lipids participating in the interaction with the peptides indicated a shift in the band position and intensity of the asymmetric PO2(-) stretching vibration originating from the lipid phosphate groups, a consequence of the sterical changes in the head group region. Interestingly, FRET spectroscopy showed a similar intercalation of both peptides into the DMPG and LPS, but much less into the DMPE membrane systems. These results are discussed in the light of a possible use of the peptides as antimicrobial and anti-endotoxin drugs.
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Affiliation(s)
- Wilmar Correa
- Instituto de Química, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia, AA. 1226 Medellín, Colombia.
| | - Marcela Manrique-Moreno
- Instituto de Química, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia, AA. 1226 Medellín, Colombia.
| | - Edwin Patiño
- Instituto de Química, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia, AA. 1226 Medellín, Colombia.
| | - Carlos Peláez-Jaramillo
- Instituto de Química, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia, AA. 1226 Medellín, Colombia.
| | - Yani Kaconis
- Forschungszentrum Borstel, LG Biophysik, D-23845 Borstel, Germany.
| | - Thomas Gutsmann
- Forschungszentrum Borstel, LG Biophysik, D-23845 Borstel, Germany.
| | - Patrick Garidel
- Martin-Luther-University Halle/Wittenberg, Department of Chemistry/Physical Chemistry, D-06120 Halle/Saale, Germany.
| | - Lena Heinbockel
- Forschungszentrum Borstel, LG Biophysik, D-23845 Borstel, Germany.
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Gutman J, Kaufman Y, Kawahara K, Walker SL, Freger V, Herzberg M. Interactions of glycosphingolipids and lipopolysaccharides with silica and polyamide surfaces: adsorption and viscoelastic properties. Biomacromolecules 2014; 15:2128-37. [PMID: 24835578 DOI: 10.1021/bm500245z] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Bacterial outer membrane components play a critical role in bacteria-surface interactions (adhesion and repulsion). Sphingomonas species (spp.) differ from other Gram-negative bacteria in that they lack lipopolysaccharides (LPSs) in their outer membrane. Instead, Sphingomonas spp. outer membrane consists of glycosphingolipids (GSLs). To delineate the properties of the outer membrane of Sphingomonas spp. and to explain the adhesion of these cells to surfaces, we employed a single-component-based approach of comparing GSL vesicles to LPS vesicles. This is the first study to report the formation of vesicles containing 100% GSL. Significant physicochemical differences between GSL and LPS vesicles are reported. Composition-dependent vesicle adherence to different surfaces using quartz crystal microbalance with dissipation monitoring (QCM-D) technology was observed, where higher GSL content resulted in higher mass accumulation on the sensor. Additionally, the presence of 10% GSL and above was found to promote the relative rigidity of the vesicle obtaining viscoelastic ratio of 30-70% higher than that of pure LPS vesicles.
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Affiliation(s)
- Jenia Gutman
- Department of Desalination and Water Treatment, Zuckerberg Institute for Water Research, Albert Katz International School for Desert Studies, Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev , Sede-Boqer Campus, Midreshet Ben Gurion 84990, Israel
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Zhang R, Long Y, He W, Hao X, Liu J. Application status of MALDI-TOF mass spectrometry in the identification and drug resistance of Mycobacterium tuberculosis. J Thorac Dis 2014; 6:512-6. [PMID: 24822112 DOI: 10.3978/j.issn.2072-1439.2014.02.19] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2014] [Accepted: 02/26/2014] [Indexed: 01/12/2023]
Abstract
Characterizing Mycobacterium tuberculosis (MTB) and detecting its drug resistance are challenging for clinical laboratory diagnosis, largely due to its slow growth and higher rate of genetic mutation. Matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS) is a revolutionary technique for the routine identification of microorganisms. In this review, we discuss the application status of mass spectrometry in the identification and drug resistance of M. tuberculosis.
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Affiliation(s)
- Ruixue Zhang
- 1 Institute of Clinical Laboratory Medicine, 2 Department of Traditional Chinese Medicine, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
| | - Yin Long
- 1 Institute of Clinical Laboratory Medicine, 2 Department of Traditional Chinese Medicine, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
| | - Wenfang He
- 1 Institute of Clinical Laboratory Medicine, 2 Department of Traditional Chinese Medicine, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
| | - Xiaoke Hao
- 1 Institute of Clinical Laboratory Medicine, 2 Department of Traditional Chinese Medicine, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
| | - Jiayun Liu
- 1 Institute of Clinical Laboratory Medicine, 2 Department of Traditional Chinese Medicine, Xijing Hospital, Fourth Military Medical University, Xi'an 710032, China
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Yamamoto N, Tamura A. Designing cell-aggregating peptides without cytotoxicity. Biomacromolecules 2014; 15:512-23. [PMID: 24432760 DOI: 10.1021/bm4014414] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We have designed α-helical peptides de novo that can induce aggregation of various kinds of cells by focusing on physicochemical properties such as hydrophobicity, net charges, and amphipathicity. It is shown that peptide hydrophobicity is the key factor to determine capabilities for cell aggregation while peptide net charges contribute to nonspecific electrostatic interactions with cells. On the other hand, amphipathic peptides tend to exhibit cytotoxicity such as antimicrobial activity and hemolysis, which are competitive with cell-aggregation capabilities. Different from the cases of living cells, aggregation of artificial anionic liposomes appears to be mainly determined by electrostatic interactions. This discrepancy might be due to the complex structure of surfaces of cell membranes consisting of macromolecular chains such as peptidoglycans, polysaccharides, or glycocalyx, which coexist with lipid bilayers. Our design strategy would pave the way to design peptides that lead aggregation of living cells without cytotoxicity.
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Affiliation(s)
- Naoki Yamamoto
- Department of Chemistry, Graduate School of Science, Kobe University , 1-1 Rokkodai-cho, Nada, Kobe 657-8501, Japan
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Adhikari MD, Goswami S, Panda BR, Chattopadhyay A, Ramesh A. Membrane-directed high bactericidal activity of (gold nanoparticle)-polythiophene composite for niche applications against pathogenic bacteria. Adv Healthc Mater 2013. [PMID: 23184755 DOI: 10.1002/adhm.201200278] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The use of nanoscale materials as bactericidal agents represents a novel paradigm in the development of therapeutics against drug-resistant pathogenic bacteria. In this paper the antimicrobial activity of a water soluble (gold nanoparticle)-polythiophene (AuNP-PTh) composite against common bacterial pathogens is reported. The nanocomposite is broad-spectrum in its bactericidal activity and exhibits a membrane-directed mode of action on target pathogens. The therapeutic potency of AuNP-PTh is demonstrated by experiments which reveal that the nanocomposite can breach the outer membrane defense barrier of Gram-negative pathogens for subsequent killing by a hydrophobic antibiotic, inhibit the growth of model gastrointestinal pathogens in simulated gastric fluid, and significantly eradicate bacterial biofilms. The high bacterial selectivity and lack of cytotoxicity on human cells augers well for future therapeutic application of the nanocomposite against clinically relevant pathogenic bacteria.
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Affiliation(s)
- Manab Deb Adhikari
- Department of Biotechnology, Indian Institute of Technology Guwahati, Guwahati, Assam, India
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Goswami S, Adhikari MD, Kar C, Thiyagarajan D, Das G, Ramesh A. Synthetic amphiphiles as therapeutic antibacterials: lessons on bactericidal efficacy and cytotoxicity and potential application as an adjuvant in antimicrobial chemotherapy. J Mater Chem B 2013; 1:2612-2623. [DOI: 10.1039/c3tb20226g] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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17
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Alexander DB, Iigo M, Yamauchi K, Suzui M, Tsuda H. Lactoferrin: an alternative view of its role in human biological fluids. Biochem Cell Biol 2012; 90:279-306. [PMID: 22553915 DOI: 10.1139/o2012-013] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Lactoferrin is a major component of biologically important mucosal fluids and of the specific granules of neutrophils. Understanding its biological function is essential for understanding neutrophil- and mucosal-mediated immunity. In this review, we reevaluate the in vivo functions of human lactoferrin (hLF) emphasizing in vivo studies and in vitro studies performed in biologically relevant fluids. We discuss the evidence in the literature that supports (or does not support) proposed roles for hLF in mucosal immunity and in neutrophil function. We argue that the current literature supports a microbiostatic role, but not a microbicidal role, for hLF in vivo. The literature also supports a role for hLF in inhibiting colonization and infection of epithelial surfaces by microorganisms and in protecting tissues from neutrophil-mediated damage. Using this information, we briefly discuss hLF in the context of the complex biological fluids in which it is found.
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Affiliation(s)
- David B Alexander
- Laboratory of Nanotoxicology Project, Nagoya City University, 3-1 Tanabedohri, Mizuho-ku, Nagoya 467-8603, Japan.
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Vudumula U, Adhikari MD, Ojha B, Goswami S, Das G, Ramesh A. Tuning the bactericidal repertoire and potency of quinoline-based amphiphiles for enhanced killing of pathogenic bacteria. RSC Adv 2012. [DOI: 10.1039/c2ra20140b] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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