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Larsen NW, Kostrikov S, Hansen MB, Hjørringgaard CU, Larsen NB, Andresen TL, Kristensen K. Interactions of oral permeation enhancers with lipid membranes in simulated intestinal environments. Int J Pharm 2024; 654:123957. [PMID: 38430950 DOI: 10.1016/j.ijpharm.2024.123957] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2023] [Revised: 02/17/2024] [Accepted: 02/28/2024] [Indexed: 03/05/2024]
Abstract
The oral bioavailability of therapeutic peptides is generally low. To increase peptide transport across the gastrointestinal barrier, permeation enhancers are often used. Despite their widespread use, mechanistic knowledge of permeation enhancers is limited. To address this, we here investigate the interactions of six commonly used permeation enhancers with lipid membranes in simulated intestinal environments. Specifically, we study the interactions of the permeation enhancers sodium caprate, dodecyl maltoside, sodium cholate, sodium dodecyl sulfate, melittin, and penetratin with epithelial cell-like model membranes. To mimic the molecular composition of the real intestinal environment, the experiments are performed with two peptide drugs, salmon calcitonin and desB30 insulin, in fasted-state simulated intestinal fluid. Besides providing a comparison of the membrane interactions of the studied permeation enhancers, our results demonstrate that peptide drugs as well as intestinal-fluid components may substantially change the membrane activity of permeation enhancers. This highlights the importance of testing permeation enhancement in realistic physiological environments and carefully choosing a permeation enhancer for each individual peptide drug.
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Affiliation(s)
- Nanna Wichmann Larsen
- DTU Health Tech, Department of Health Technology, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark; Center for Intestinal Absorption and Transport of Biopharmaceuticals, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
| | - Serhii Kostrikov
- DTU Health Tech, Department of Health Technology, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark; Center for Intestinal Absorption and Transport of Biopharmaceuticals, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
| | - Morten Borre Hansen
- DTU Health Tech, Department of Health Technology, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark; Center for Intestinal Absorption and Transport of Biopharmaceuticals, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
| | - Claudia Ulrich Hjørringgaard
- DTU Health Tech, Department of Health Technology, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark; Center for Intestinal Absorption and Transport of Biopharmaceuticals, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
| | - Niels Bent Larsen
- DTU Health Tech, Department of Health Technology, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark; Center for Intestinal Absorption and Transport of Biopharmaceuticals, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
| | - Thomas Lars Andresen
- DTU Health Tech, Department of Health Technology, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark; Center for Intestinal Absorption and Transport of Biopharmaceuticals, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark.
| | - Kasper Kristensen
- DTU Health Tech, Department of Health Technology, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark; Center for Intestinal Absorption and Transport of Biopharmaceuticals, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark.
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Abstract
COVID-19 infection, caused by the SARS-CoV-2 coronavirus, has led to the largest pandemic since the Spanish flu in 1918. In view of this, the development of vaccines and antiviral drugs that can stop the spread of this infection has become an acute issue. Currently, in the search for antiviral drugs against COVID-19, much attention is paid to the study of the structure of the receptor-binding domain of the surface protein S. However, the emergence of new SARS-CoV-2 coronavirus strains indicates its high variability, which reduces the effectiveness of vaccines and antiviral drugs. At the same time, the envelope protein E of this virus is membrane active and shows a rather high conservatism. Despite the critical importance of this protein in the coronavirus life cycle, the physicochemical mechanisms of its interaction with cell membranes still remain unclear. So, we investigated the membrane activity of protein E of the SARS-CoV-2 coronavirus on models of giant unilamellar vesicles and lipid nanotubes. As a result, it was found that the protein forms pores in the lipid bilayer, i.e., performs the main function of viroporin. In addition, protein E is able to deform lipid membranes and form double-membrane vesicles depending on the concentration.
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Affiliation(s)
- Zaret Denieva
- A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow, Russia
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3
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Ajayakumar N, Narayanan P, Anitha AK, R MK, Kumar S. Membrane disruptive action of cationic anti-bacterial peptide B1CTcu3. Chembiochem 2022; 23:e202200239. [PMID: 35713298 DOI: 10.1002/cbic.202200239] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2022] [Revised: 06/15/2022] [Indexed: 11/09/2022]
Abstract
A twenty-two-residue peptide Brevinin1 Clinotarsus curtipus-3 (B1CTcu3), identified from the skin secretion of frog Clinotarsus curtipes of the Western Ghats, exhibited a broad range of antibacterial activity against Gram-negative and Gram-positive bacteria, including the methicillin-resistant Staphylococcus aureus (MRSA). It showed anti-biofilm activity even at sub-Minimum Inhibitory Concentration (sub-MIC) against Pseudomonas aeruginosa and Staphylococcus aureus. Analysis of the scanning electron microscopic (SEM) images, confocal images, flow cytometric data and the effect of salt concentration on antibacterial potency suggests that the killing action of the peptide is through the membranolytic process. Single channel electric recording confirmed that the peptide elicited pores on the bacterial cell membrane as it induces a heterogeneous channel in the lipid bilayer. It also showed cytotoxicity against MDA-MB-231 breast cancer cell with IC50 of 25µM. B1CTcu3 peptide could serve as the template for next-generation antibacterial agents, particularly against antibiotic resistant pathogenic bacteria.
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Affiliation(s)
- Neethu Ajayakumar
- Rajiv Gandhi Centre for Biotechnology, Chemical Biology Lab, RGCB-BIO innovation centre, Kinfra film and video park, Chandavila, kazhakoottam, 695523, trivandrum, INDIA
| | - Pratibha Narayanan
- Rajiv Gandhi Centre for Biotechnology, Chemical Biology Lab, rgcb-BIC Innovation Centre, Kinfra film and video park, Chandavila, Kazhakoottam, 695523, Trivandrum, INDIA
| | - Anju Krishnan Anitha
- Rajiv Gandhi Centre for Biotechnology, Chemical Biology Lab, RGCB-BIC Innovation Centre, Kinfra film and video park, Chandavila, Kazhakoottam, 695523, Trivandrum, INDIA
| | - Mahendran Kozhinjampara R
- Rajiv Gandhi Centre for Biotechnology, Membrane biology lab, RGCB-BIC Innovation centre, Kinfra film and video park, chandavila, kazhakoottam, 695523, rivandrum, INDIA
| | - Santhosh Kumar
- Rajiv Gandhi Centre for Biotechnology, Chemical Biology, Poojappura, 695014, Thiruvananthapuram, INDIA
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Paramonov AS, Lyukmanova EN, Tonevitsky AG, Arseniev AS, Shenkarev ZO. Spatial structure and oligomerization of viscotoxin A3 in detergent micelles: Implication for mechanisms of ion channel formation and membrane lysis. Biochem Biophys Res Commun 2021; 585:22-8. [PMID: 34781057 DOI: 10.1016/j.bbrc.2021.11.022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2021] [Accepted: 11/03/2021] [Indexed: 11/22/2022]
Abstract
Thionins are the family of small (∼5 kDa) cationic cysteine-rich peptides involved in the immune response in plants. Viscotoxin A3 (VtA3) is the thionin from mistletoe (Viscum album) demonstrating antimicrobial and cytotoxic activity against cancer cells in vitro. VtA3 (charge +6) interacts with the membranes containing anionic lipids and forms cation-selective ion channels. Here we studied the VtA3 structure in membrane-mimicking media by NMR spectroscopy. Spatial structure of VtA3, consisting of a helical hairpin and a short β-sheet, was stable and did not undergo significant changes during micelle binding. VtA3 molecule bound with high affinity to the surface of zwitterionic dodecylphosphocholine (DPC) micelle by hydrophobic patch in the helical hairpin. Oligomerization of VtA3 was observed in the anionic micelles of sodium dodecylsulphate (SDS). No direct contacts between the peptide molecules were observed and the possible interfaces of detergent-assisted oligomerization were revealed. The data obtained suggest that the VtA3 membrane activity, depending on the concentration, obeys the 'toroidal' pore model or the 'carpet' mechanism. The model of the membrane disrupting complex, which explains the ion channel formation in the partially anionic membranes, was proposed.
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Kopiasz RJ, Rukasz A, Chreptowicz K, Podgórski R, Kuźmińska A, Mierzejewska J, Tomaszewski W, Ciach T, Jańczewski D. Influence of lipid bilayer composition on the activity of antimicrobial quaternary ammonium ionenes, the interplay of intrinsic lipid curvature and polymer hydrophobicity, the role of cardiolipin. Colloids Surf B Biointerfaces 2021; 207:112016. [PMID: 34364250 DOI: 10.1016/j.colsurfb.2021.112016] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Revised: 07/20/2021] [Accepted: 07/26/2021] [Indexed: 01/03/2023]
Abstract
Incorporation of hydrophobic component into amphiphilic polycations structure is frequently accompanied by an increase of antimicrobial activity. There is, however, a group of relatively hydrophilic polycations containing quaternary ammonium moieties along mainchain, ionenes, which also display strong antimicrobial and limited hemolytic properties. In this work, an influence of a hydrophobic side group length on antimicrobial mechanism of action is investigated in a series of novel amphiphilic ionenes. High antimicrobial activity was found by determination of minimum inhibitory concentration (MIC) and minimum bactericidal, and fungicidal concentration (MBC and MFC) in both growth media and a buffer. Biocompatibility was estimated by hemolytic and mammalian cells viability assays. Mechanistic studies were performed using large unilamellar vesicles (LUVs) with different lipid composition, as simplified models of cell membranes. The investigated ionenes are potent and selective antimicrobial molecules displaying a decrease of antimicrobial activity correlated with increase of hydrophobicity. Studies using LUVs revealed that the cardiolipin is an essential component responsible for the lipid bilayer permeabilization by investigated ionens. In contrast to relatively hydrophilic ionenes, more hydrophobic polymers showed an ability to stabilize membranes composed of lipids with negative spontaneous curvature in a certain range of polymer to lipid ratio. The results substantially contribute to the understanding of antimicrobial activity of the investigated class of polymers.
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Bansal S, Su WC, Budamagunta M, Xiao W, Ajena Y, Liu R, Voss JC, Carney RP, Parikh AN, Lam KS. Discovery and mechanistic characterization of a structurally-unique membrane active peptide. Biochim Biophys Acta Biomembr 2020; 1862:183394. [PMID: 32562695 PMCID: PMC7478859 DOI: 10.1016/j.bbamem.2020.183394] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2020] [Revised: 05/21/2020] [Accepted: 06/07/2020] [Indexed: 02/07/2023]
Abstract
Membrane active peptides (MAPs) have gained wide interest due to their far reaching applications in drug discovery and drug delivery. The search for new MAPs, however, has been largely skewed with bias selecting for physicochemical parameters believed to be important for membrane activity, such as alpha helicity, cationicity and hydrophobicity. Here we carry out a search-and-find strategy to screen a 100,000-membered one-bead-one-compound (OBOC) combinatorial peptide library for lead compounds, agnostic of those physicochemical constraints. Such a synthetic strategy also permits expansion of our peptide repertoire to include unnatural amino acids. Using this approach, we discovered a structurally unique lead peptide LBF14, a linear 14-mer peptide, that induces gross morphological disruption of membranes, irrespective of membrane composition. Further, we demonstrate that the unique insertion mechanism of the peptide, visualized by spinning disc confocal microscopy and further analyzed by electron paramagnetic resonance measurements, may be the cause of this large scale membrane deformation. We also demonstrate the robustness, reproducibility, and potential application of this technique to discover and characterize new membrane active peptides that display activity by local insertion and subsequent allosteric effects leading to global membrane disruption.
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Affiliation(s)
- Shivani Bansal
- Department of Biochemistry and Molecular Medicine, School of Medicine, University of California, Davis, United States of America; Department of Chemistry, University of California, Davis, United States of America
| | - Wan-Chih Su
- Department of Chemistry, University of California, Davis, United States of America; Department of Biomedical Engineering, University of California, Davis, United States of America
| | - Madhu Budamagunta
- Department of Biochemistry and Molecular Medicine, School of Medicine, University of California, Davis, United States of America
| | - Wenwu Xiao
- Department of Biochemistry and Molecular Medicine, School of Medicine, University of California, Davis, United States of America
| | - Yousif Ajena
- Department of Biochemistry and Molecular Medicine, School of Medicine, University of California, Davis, United States of America
| | - Ruiwu Liu
- Department of Biochemistry and Molecular Medicine, School of Medicine, University of California, Davis, United States of America
| | - John C Voss
- Department of Biochemistry and Molecular Medicine, School of Medicine, University of California, Davis, United States of America
| | - Randy P Carney
- Department of Biomedical Engineering, University of California, Davis, United States of America
| | - Atul N Parikh
- Department of Biomedical Engineering, University of California, Davis, United States of America
| | - Kit S Lam
- Department of Biochemistry and Molecular Medicine, School of Medicine, University of California, Davis, United States of America; Department of Chemistry, University of California, Davis, United States of America.
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Abstract
This spotlight on application provides a brief overview of our research exploration, focusing on the research of small molecules with membrane-active antibacterial activity that mimic host-defense peptides (HDPs). The development of antimicrobial HDP agents is an emerging research area as they circumvent the potential disadvantages of HDPs. The small molecules are preferable for development due to their low production cost and potential of more practical applications. In recent years, we conducted research on the design of antibacterial agents based on small molecules including hydantoins, acylated reduced amides, biscyclic guanidines, and dimeric alkylamides of lysines. We herein sketch our journey on the exploration of the antimicrobial activity of these few classes of molecules and hopefully share our insight in the future design of small-molecular-weight antibiotic agents with membrane-active activity that mimic HDPs.
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Affiliation(s)
- Mi Zhou
- Department of Chemistry, University of South Florida, 4202 East Fowler Avenue, Tampa, Florida 33620, United States
| | - Mengmeng Zheng
- Department of Chemistry, University of South Florida, 4202 East Fowler Avenue, Tampa, Florida 33620, United States
| | - Jianfeng Cai
- Department of Chemistry, University of South Florida, 4202 East Fowler Avenue, Tampa, Florida 33620, United States
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8
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Azerang P, Khalaj V, Kobarfard F, Owlia P, Sardari S, Shahidi S. Molecular Characterization of a Fungus Producing Membrane Active Metabolite and Analysis of the Produced Secondary Metabolite. Iran Biomed J 2019; 23. [PMID: 30218995 PMCID: PMC6707112 DOI: 10.29252/.23.2.121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/04/2022]
Abstract
BACKGROUND The majority of studies on soil Aspergillus concern the isolation and characterization of the antimicrobial compounds produced by this organism. Our previous studies indicated an isolated Aspergillus strain soil to be of interest, and this subject is further investigated here. METHODS Soil samples of various locations in Iran were collected. Extract from Aspergillus sp. culture was obtained using ethyl acetate fractionation. Antimicrobial activity testing was performed using broth microdilution assay against Escherichia coli, Candida albicans, and Staphylococcus aureus microorganisms. One metabolite PA3-d10 was isolated from these active extracts and identified using thin layer chromatography, preparative thin-layer chromatography, HPLC, 1HNMR (proton nuclear magnetic resonance), 2D NMR, and LC-MS (liquid chromatography-mass spectrometry). RESULTS According to morphological and biochemical properties as well as ITS rDNA sequencing, we identified an isolate of Aspergillus flavus. The ethyl acetate fraction of the fermentation medium containing membrane active metabolites showed antimicrobial effects against different bacterial and yeast indicator strains. One metabolite from these active extracts was finally identified. CONCLUSION Membrane active fraction produced by Aspergillus strain in this research demonstrated antimicrobial activities against bacteria and yeast strains. Therefore, this metabolite can be considered as a potential antimicrobial membrane active agent.
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Affiliation(s)
- Parisa Azerang
- Drug Design and Bioinformatics Unit, Medical Biotechnology Department, Biotechnology Research Center, Pasteur Institute of Iran, Tehran, Iran
| | - Vahid Khalaj
- Medical Biotechnology Departments, Biotechnology Research Center, Pasteur Institute of Iran, Tehran, Iran
| | - Farzad Kobarfard
- Department of Medicinal Chemistry, School of Pharmacy, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Parviz Owlia
- Molecular Microbiology Research Center, Faculty of Medicine, Shahed University, Tehran, Iran
| | - Soroush Sardari
- Drug Design and Bioinformatics Unit, Medical Biotechnology Department, Biotechnology Research Center, Pasteur Institute of Iran, Tehran, Iran;,Corresponding Author: Soroush Sardari , Drug Design and Bioinformatics Unit, Medical Biotechnology Department, Biotechnology Research Center, Pasteur Institute of Iran, Tehran 13164, Iran; E-mail:
| | - Sahar Shahidi
- Drug Design and Bioinformatics Unit, Medical Biotechnology Department, Biotechnology Research Center, Pasteur Institute of Iran, Tehran, Iran
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9
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Fu J, Yang H, Wang J. Computational design of the helical hairpin structure of membrane-active antibacterial peptides based on RSV glycoprotein epitope scaffold. Comput Biol Chem 2018; 73:200-205. [PMID: 29499459 DOI: 10.1016/j.compbiolchem.2018.02.013] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2017] [Revised: 02/10/2018] [Accepted: 02/15/2018] [Indexed: 12/16/2022]
Abstract
Peptides with helical hairpin conformation have been found to possess potent membrane activity and can be exploited as the structural scaffold of antibacterial peptides (ABPs). Here, we attempted to computationally design membrane-active ABPs based on the helical hairpin motif of respiratory syncytial virus (RSV) glycoprotein epitope. Dynamics simulations revealed that the epitope peptide Rfe (net charge = -1) cannot effectively interact with and permeabilize bacterial membrane due to the electrostatic repulsion between the negatively charged peptide and anionic membrane surface. The native Rfe can be modified to a cationic peptide Rfe-KKK (net charge = +6) by triple mutation of its positively charged residues Glu256, Asp263 and Asp269 to a basic lysine as well as by C-terminal amidation. As might be expected, the modified peptide was able to target membrane surface with a moderate antibacterial potency (MIC = 50-100 μg/ml). Next, a cyclized version of the linear Rfe-KKK was generated, termed as cycRfe-KKK, which was observed to have improved membrane activity and increased antibacterial potency (MIC < 50 μg/ml) by pre-stabilizing amphipathic hairpin conformation of the peptide.
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Affiliation(s)
- Jinhua Fu
- Intensive Care Unit, Yidu Central Hospital Affiliated to Weifang Medical University, Qingzhou 262500, China.
| | - Hong Yang
- Emergency Department Work Office, Yidu Central Hospital Affiliated to Weifang Medical University, Qingzhou 262500, China
| | - Jing Wang
- Intensive Care Unit, Yidu Central Hospital Affiliated to Weifang Medical University, Qingzhou 262500, China
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10
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Abstract
Cell penetrating peptides (CPPs) have been proven to be an effective vector to deliver a variety of membrane-impermeable macromolecules, such as DNAs, siRNAs, and proteins. Conventional single-chain CPPs typically suffer from severe protease degradation and fast clearance rate for in vivo therapeutic delivery application. In this chapter, we show that supramolecular assembly of de novo designed cationic multidomain peptides (MDPs) leads to nanostructured filaments with increased proteolytic stability and potent membrane activity necessary for improved transfection efficiency.
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Soghomonyan D, Margaryan A, Trchounian K, Ohanyan K, Badalyan H, Trchounian A. The Effects of Low Doses of Gamma-Radiation on Growth and Membrane Activity of Pseudomonas aeruginosa GRP3 and Escherichia coli M17. Cell Biochem Biophys 2017; 76:209-217. [PMID: 29039057 DOI: 10.1007/s12013-017-0831-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2017] [Accepted: 10/09/2017] [Indexed: 11/26/2022]
Abstract
Microorganisms are part of the natural environments and reflect the effects of different physical factors of surrounding environment, such as gamma (γ) radiation. This work was devoted to the study of the influence of low doses of γ radiation with the intensity of 2.56 μW (m2 s)-1 (absorbed doses were 3.8 mGy for the radiation of 15 min and 7.2 mGy-for 30 min) on Escherichia coli M-17 and Pseudomonas aeruginosa GRP3 wild type cells. The changes of bacterial, growth, survival, morphology, and membrane activity had been studied after γ irradiation. Verified microbiological (specific growth rate, lag phase duration, colony-forming units (CFU) number, and light microscopy digital image analysis), biochemical (ATPase activity of bacterial membrane vesicles), and biophysical (H+ fluxes throughout cytoplasmic membrane of bacteria) methods were used for assessment of radiation implications on bacteria. It was shown that growth specific rate, lag phase duration and CFU number of these bacteria were lowered after irradiation, and average cell surface area was decreased too. Moreover ion fluxes of bacteria were changed: for P. aeruginosa they were decreased and for E. coli-increased. The N,N'-dicyclohexylcarbodiimide (DCCD) sensitive fluxes were also changed which were indicative for the membrane-associated F0F1-ATPase enzyme. ATPase activity of irradiated membrane vesicles was decreased for P. aeruginosa and stimulated for E. coli. Furthermore, DCCD sensitive ATPase activity was also changed. The results obtained suggest that these bacteria especially, P. aeruginosa are sensitive to γ radiation and might be used for developing new monitoring methods for estimating environmental changes after γ irradiation.
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Affiliation(s)
- D Soghomonyan
- Research Institute of Biology, Biology Faculty, Yerevan State University, 1A. Manoogian, 0025, Yerevan, Armenia
| | - A Margaryan
- Research Institute of Biology, Biology Faculty, Yerevan State University, 1A. Manoogian, 0025, Yerevan, Armenia
| | - K Trchounian
- Research Institute of Biology, Biology Faculty, Yerevan State University, 1A. Manoogian, 0025, Yerevan, Armenia
| | - K Ohanyan
- Department of Nuclear Physics, Yerevan State University, 1A. Manoogian, 0025, Yerevan, Armenia
| | - H Badalyan
- Department of General Physics and Astrophysics, Yerevan State University, 1A. Manoogian, 0025, Yerevan, Armenia
| | - A Trchounian
- Research Institute of Biology, Biology Faculty, Yerevan State University, 1A. Manoogian, 0025, Yerevan, Armenia.
- Department of Biochemistry Microbiology and Biotechnology, Yerevan State University, 1A. Manoogian, 0025, Yerevan, Armenia.
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Xu D, Samways DSK, Dong H. Fabrication of self-assembling nanofibers with optimal cell uptake and therapeutic delivery efficacy. Bioact Mater 2017; 2:260-8. [PMID: 29744435 DOI: 10.1016/j.bioactmat.2017.09.001] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2017] [Revised: 09/12/2017] [Accepted: 09/15/2017] [Indexed: 12/14/2022] Open
Abstract
Effective strategies to fabricate finite organic nanoparticles and understanding their structure-dependent cell interaction is highly important for the development of long circulating nanocarriers in cancer therapy. In this contribution, we will capitalize on our recent development of finite supramolecular nanofibers based on the self-assembly of modularly designed cationic multidomain peptides (MDPs) and use them as a model system to investigate structure-dependent cell penetrating activity. MDPs self-assembled into nanofibers with high density of cationic charges at the fiber-solvent interface to interact with the cell membrane. However, despite the multivalent charge presentation, not all fibers led to high levels of membrane activity and cellular uptake. The flexibility of the cationic charge domains on self-assembled nanofibers plays a key role in effective membrane perturbation. Nanofibers were found to sacrifice their dimension, thermodynamic and kinetic stability for a more flexible charge domain in order to achieve effective membrane interaction. The increased membrane activity led to improved cell uptake of membrane-impermeable chemotherapeutics through membrane pore formation. In vitro cytotoxicity study showed co-administering of water-soluble doxorubicin with membrane-active peptide nanofibers dramatically reduced the IC50 by eight folds compared to drug alone. Through these detailed structure and activity studies, the acquired knowledge will provide important guidelines for the design of a variety of supramolecular cell penetrating nanomaterials not limited to peptide assembly which can be used to probe various complex biological processes.
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Christoffersen HF, Hansen SK, Vad BS, Nielsen EH, Nielsen JT, Vosegaard T, Skrydstrup T, Otzen DE. The natural, peptaibolic peptide SPF-5506-A4 adopts a β-bend spiral structure, shows low hemolytic activity and targets membranes through formation of large pores. Biochim Biophys Acta 2015; 1854:882-9. [PMID: 25796141 DOI: 10.1016/j.bbapap.2015.03.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2014] [Revised: 03/04/2015] [Accepted: 03/06/2015] [Indexed: 12/23/2022]
Abstract
The medium-length fungal peptaibol SPF-5506-A(4) has been shown to inhibit formation of the Aβ peptide involved in Alzheimer''s disease. As Aβ is a cleavage-product from the membrane-bound APP protein, we hypothesized that SPF-5506-A(4)'s activity might be linked to membrane interactions in general. Here we describe the synthesis, structure and membrane interactions of SPF-5506-A4. The challenging synthesis was carried out on solid phase and a detailed conformational analysis in solution revealed a β-bend ribbon spiral core structure with flexible termini. Investigations of its membrane activity revealed low hemolytic activity, limited inhibition of both Gram-positive and Gram-negative cell growth and a preference for an overall negatively charged membrane surface mimicking the bacterial cell surface. SPF-5506-A(4) is the first peptaibol to be shown to facilitate leakage of large (4.6 nm diameter) fluorescence-labeled dextran from vesicles while leaving the vesicles intact. We conclude that SPF-5506-A(4) follows the toroidal pore model in its mode of action.
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