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Zhang Y, Liang Y, Pan D, Bai S, Wen D, Tang M, Song H, Guo X, Han H. Enhancing Escherichia coli Inactivation: Synergistic Mechanism of Ultraviolet Light and High-Voltage Electric Field. Foods 2024; 13:1343. [PMID: 38731714 PMCID: PMC11083544 DOI: 10.3390/foods13091343] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2024] [Revised: 04/21/2024] [Accepted: 04/22/2024] [Indexed: 05/13/2024] Open
Abstract
This study investigated the bactericidal effects of ultraviolet (UV) radiation, a high-voltage electric field (HVEF), and their combination on Escherichia coli. The results indicated that UV and combined disinfection were more effective with longer exposure, leading to significant reductions in microbial activity. Specifically, the single UV disinfection alone reduced activity by 3.3 log after 5 min, while combined disinfection achieved a 4.2 log reduction. In contrast, short-term HVEF treatment did not exhibit significant bactericidal effects, only achieving a reduction of 0.17 log in 5 min. Furthermore, prolonged exposure to both UV disinfection and an HVEF was found to damage cell membranes, ultimately causing cell death, while shorter durations did not. Despite rapid cell count decreases, flow cytometry did not detect apoptotic or necrotic cells, likely due to rapid cell rupture. This study suggests that combining UV radiation and an HVEF could be a promising approach for inhibiting bacterial reproduction, with HVEF enhancing UV effects. These findings provide insights for using combined HVEF and UV disinfection in food safety and preservation.
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Affiliation(s)
- Yihan Zhang
- School of Light Industry and Engineering, South China University of Technology, Guangzhou 510640, China; (Y.Z.); (Y.L.)
- State Key Laboratory of NBC Protection for Civilian, Beijing 102205, China; (D.P.); (S.B.); (D.W.); (X.G.); (H.H.)
| | - Yun Liang
- School of Light Industry and Engineering, South China University of Technology, Guangzhou 510640, China; (Y.Z.); (Y.L.)
| | - Di Pan
- State Key Laboratory of NBC Protection for Civilian, Beijing 102205, China; (D.P.); (S.B.); (D.W.); (X.G.); (H.H.)
| | - Shupei Bai
- State Key Laboratory of NBC Protection for Civilian, Beijing 102205, China; (D.P.); (S.B.); (D.W.); (X.G.); (H.H.)
| | - Diya Wen
- State Key Laboratory of NBC Protection for Civilian, Beijing 102205, China; (D.P.); (S.B.); (D.W.); (X.G.); (H.H.)
| | - Min Tang
- School of Light Industry and Engineering, South China University of Technology, Guangzhou 510640, China; (Y.Z.); (Y.L.)
| | - Hua Song
- State Key Laboratory of NBC Protection for Civilian, Beijing 102205, China; (D.P.); (S.B.); (D.W.); (X.G.); (H.H.)
| | - Xuan Guo
- State Key Laboratory of NBC Protection for Civilian, Beijing 102205, China; (D.P.); (S.B.); (D.W.); (X.G.); (H.H.)
| | - Hao Han
- State Key Laboratory of NBC Protection for Civilian, Beijing 102205, China; (D.P.); (S.B.); (D.W.); (X.G.); (H.H.)
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Algethami JS, Amna T, S Alqarni L, Alshahrani AA, Alhamami MAM, Seliem AF, Al-Dhuwayin BHA, Hassan MS. Production of Ceramics/Metal Oxide Nanofibers via Electrospinning: New Insights into the Photocatalytic and Bactericidal Mechanisms. Materials (Basel) 2023; 16:5148. [PMID: 37512422 PMCID: PMC10386518 DOI: 10.3390/ma16145148] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Revised: 07/16/2023] [Accepted: 07/17/2023] [Indexed: 07/30/2023]
Abstract
Environmental pollution is steadily rising and is having a negative influence on all living things, especially human beings. The advancement of nanoscience in recent decades has provided potential to address this issue. Functional metal oxide nanoparticles/nanofibers have been having a pull-on effect in the biological and environmental domains of nanobiotechnology. Current work, for the first time, is focusing on the electrospinning production of Zr0.5Sn0.5TiO3/SnO2 ceramic nanofibers that may be utilized to battle lethal infections swiftly and inexpensively. By using characterizations like XRD, FT-IR, FESEM, TEM, PL, and UV-Vis-DRS, the composition, structure, morphology, and optical absorption of samples were determined. The minimum inhibitory concentration (MIC) approach was used to investigate the antibacterial activity. Notably, this research indicated that nanofibers exert antibacterial action against both Gram-positive and Gram-negative bacteria with a MIC of 25 µg/mL. Furthermore, negatively charged E. coli was drawn to positively charged metal ions of Zr0.5Sn0.5TiO3/SnO2, which showed a robust inhibitory effect against E. coli. It was interesting to discover that, compared to pure TiO2, Zr0.5Sn0.5TiO3/SnO2 nanofibers revealed increased photocatalytic activity and exceptional cyclability to the photodegradation of Rhodamine B. The composite completely degrades dye in 30 min with 100% efficacy and excellent (97%) reusability. The synergetic effects of Zr0.5Sn0.5TiO3 and SnO2 may be responsible for increased photocatalytic and bactericidal activity.
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Affiliation(s)
- Jari S Algethami
- Department of Chemistry, College of Science and Arts, Najran University, Najran 11001, Saudi Arabia
- Promising Centre for Sensors and Electronic Devices (PCSED), Advanced Materials and Nano-Research Centre, Najran University, Najran 11001, Saudi Arabia
| | - Touseef Amna
- Department of Biology, College of Science, Al-Baha University, Albaha 65799, Saudi Arabia
| | - Laila S Alqarni
- Department of Chemistry, College of Science, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh 11432, Saudi Arabia
| | - Aisha A Alshahrani
- Department of Chemistry, College of Science, Al-Baha University, Albaha 65799, Saudi Arabia
| | - Mohsen A M Alhamami
- Department of Chemistry, College of Science and Arts, Najran University, Najran 11001, Saudi Arabia
| | - Amal F Seliem
- Department of Chemistry, College of Science and Arts, Najran University, Najran 11001, Saudi Arabia
| | - Badria H A Al-Dhuwayin
- Department of Chemistry, College of Science and Arts, Najran University, Najran 11001, Saudi Arabia
| | - M Shamshi Hassan
- Department of Chemistry, College of Science, Al-Baha University, Albaha 65799, Saudi Arabia
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Buatong J, Mittal A, Mittraparp-arthorn P, Palamae S, Saetang J, Benjakul S. Bactericidal Action of Shrimp Shell Chitooligosaccharide Conjugated with Epigallocatechin Gallate (COS-EGCG) against Listeria monocytogenes. Foods 2023; 12:foods12030634. [PMID: 36766163 PMCID: PMC9914238 DOI: 10.3390/foods12030634] [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] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2023] [Accepted: 01/28/2023] [Indexed: 02/05/2023] Open
Abstract
The antibacterial effect of chitooligosaccharide conjugated with five different polyphenols, including catechin (COS-CAT), epigallocatechin gallate (COS-EGCG), gallic acid (COS-GAL), caffeic acid (COS-CAF), and ferulic acid (COS-FER), against Listeria monocytogenes was investigated. Among all the conjugates tested, COS-EGCG showed the highest inhibition toward Listeria monocytogenes, with a minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) of 1024 and 1024 µg/mL, respectively. The COS-EGCG conjugate also had a bactericidal effect on the environmental and clinical strains of L. monocytogenes. The low concentration of COS-EGCG conjugate augmented the formation of biofilm and the growth of L. monocytogenes. Nevertheless, the inhibition of biofilm formation and bacterial growth was achieved when treated with the COS-EGCG conjugate at 2 × MIC for 48 h. In addition, the COS-EGCG conjugate at 2 × MIC had the potential to inactivate the pre-biofilm, and it reduced the production of the extracellular polysaccharides of L. monocytogenes. The COS-EGCG conjugate at the MIC/4 effectively impeded the motility (the swimming and swarming) of L. monocytogenes, with an 85.7-94.3% inhibition, while 100% inhibition was achieved with the MIC. Based on scanning electron microscopic (SEM) images, cell wall damage with numerous pores on the cell surface was observed. Such cell distortion resulted in protein leakage. As a result, COS-EGCG could penetrate into the cell and bind with the DNA backbone. Therefore, the COS-EGCG conjugate could be further developed as a natural antimicrobial agent for inhibiting or controlling L. monocytogenes.
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Affiliation(s)
- Jirayu Buatong
- International Center of Excellence in Seafood Science and Innovation, Faculty of Agro-Industry, Prince of Songkla University, Hat Yai 90110, Songkhla, Thailand
| | - Ajay Mittal
- International Center of Excellence in Seafood Science and Innovation, Faculty of Agro-Industry, Prince of Songkla University, Hat Yai 90110, Songkhla, Thailand
| | - Pimonsri Mittraparp-arthorn
- Division of Biological Science, Faculty of Science, Prince of Songkla University, Hat Yai 90110, Songkhla, Thailand
| | - Suriya Palamae
- International Center of Excellence in Seafood Science and Innovation, Faculty of Agro-Industry, Prince of Songkla University, Hat Yai 90110, Songkhla, Thailand
| | - Jirakrit Saetang
- International Center of Excellence in Seafood Science and Innovation, Faculty of Agro-Industry, Prince of Songkla University, Hat Yai 90110, Songkhla, Thailand
| | - Soottawat Benjakul
- International Center of Excellence in Seafood Science and Innovation, Faculty of Agro-Industry, Prince of Songkla University, Hat Yai 90110, Songkhla, Thailand
- Correspondence: ; Tel.: +66-7428-6334
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Shen S, Sun Y, Ren F, Blair JMA, Siasat P, Fan S, Hu J, He J. Characteristics of antimicrobial peptide OaBac5mini and its bactericidal mechanism against Escherichia coli. Front Vet Sci 2023; 10:1123054. [PMID: 36908510 PMCID: PMC9995905 DOI: 10.3389/fvets.2023.1123054] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2022] [Accepted: 02/06/2023] [Indexed: 02/25/2023] Open
Abstract
Introduction Antimicrobial peptides (AMPs) play an important role in defending against the attack of pathogenic microorganisms. Among them, the proline-rich antibacterial peptides (PrAMPs) have been attracting close attention due to their simple structure, strong antibacterial activity, and low cell toxicity. OaBac5mini is an active fragment of the sheep-derived OaBac5 belonging to the PrAMPs family. Methods In this study, the antibacterial activity of OaBac5mini was investigated by testing the MICs against different stains of E. coli and S. aureus as well as the time-kill curve. The bactericidal mechanism was explored by determining the effect of OaBac5mini on the cell membrane. The stability and biosafety were also evaluated. Results The susceptibility test demonstrated that OaBac5mini showed potent antibacterial activity against the multidrug-resistant (MDR) E. coli isolates. It is noticeable that the absence of inner membrane protein SbmA in E. coli ATCC 25922 caused the MIC of OaBac5mini to increase 4-fold, implying OaBac5mini can enter into the cytoplasm via SbmA and plays its antibacterial activity. Moreover, the antibacterial activity of OaBac5mini against E. coli ATCC 25922 was not remarkably affected by the serum salts except for CaCl2 at a physiological concentration, pH, temperature, repeated freeze-thawing and proteases (trypsin < 20 μg/mL, pepsin or proteinase K). Time-kill curve analysis showed OaBac5mini at the concentration of 200 μg/mL (8 × MICs) could effectively kill E. coli ATCC 25922 after co-incubation for 12 h. In addition, OaBac5mini was not hemolytic against rabbit red blood cells and also was not cytotoxic to porcine small intestinal epithelial cells (IPEC-J2). Bioinformatic analysis indicated that OaBac5mini is a linear peptide with 8 net positive charges. Furthermore, OaBac5mini significantly increased the outer membrane permeability and impaired the inner membrane integrity and ultrastructure of E. coli ATCC25922. Conclusion OaBac5mini is a stable and potent PrAMP that kills E. coli by two different modes of action - inhibiting intracellular target(s) and damaging cell membrane.
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Affiliation(s)
- Shanshan Shen
- College of Veterinary Medicine, Shanxi Agricultural University, Taigu, Shanxi, China.,College of Animal Science and Veterinary Medicine, Henan Institute of Science and Technology, Xinxiang, Henan, China
| | - Yawei Sun
- College of Animal Science and Veterinary Medicine, Henan Institute of Science and Technology, Xinxiang, Henan, China
| | - Fei Ren
- College of Animal Science and Veterinary Medicine, Henan Institute of Science and Technology, Xinxiang, Henan, China
| | - Jessica M A Blair
- Institute of Microbiology and Infection, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Pauline Siasat
- Institute of Microbiology and Infection, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Shuaiqi Fan
- College of Animal Science and Veterinary Medicine, Henan Institute of Science and Technology, Xinxiang, Henan, China
| | - Jianhe Hu
- College of Animal Science and Veterinary Medicine, Henan Institute of Science and Technology, Xinxiang, Henan, China
| | - Junping He
- College of Veterinary Medicine, Shanxi Agricultural University, Taigu, Shanxi, China
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Zhao H, Ji R, Zha X, Xu Z, Lin Y, Zhou S. Investigation of the bactericidal mechanism of Penicilazaphilone C on Escherichia coli based on 4D label-free quantitative proteomic analysis. Eur J Pharm Sci 2022; 179:106299. [PMID: 36179970 DOI: 10.1016/j.ejps.2022.106299] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [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: 07/04/2022] [Revised: 08/16/2022] [Accepted: 08/27/2022] [Indexed: 11/03/2022]
Abstract
There is an urgent need to find new antibiotics to fight against the increasing drug resistance of microorganisms. A novel natural compound, Penicilazaphilone C (PAC), was isolated from a marine-derived fungus. It has displayed broad bactericidal activities against Gram-negative and Gram-positive bacteria. However, its bactericidal mechanism is still unknown. Herein, time-kill assays verified that PAC is a fast and efficient bactericidal agent. Furthermore, data from 4D label-free quantitative proteome assays revealed that PAC significantly influences over 898 proteins in Escherichia coli. Combining the results of biofilm formation, β-galactosidase measurement, TEM observation, soft agar plate swimming, reactive oxygen species measurement, qRT-PCR, and west-blotting, the mode of PAC action against E. coli was to block respiration, inhibit assimilatory nitrate reduction and dissimilar sulfur reduction, facilitate assimilatory sulfate reduction, suppress cysteine and methionine biosynthesis, down-regulate antioxidant protein expression and induced intracellular ROS accumulation, weaken bacterial chemotaxis, destroy flagellar assembly, etc., and finally cause the bacteria's death. Our findings suggest that PAC could have a multi-target regulatory effect on E. coli and could be used as a new antibiotic in medicine.
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Affiliation(s)
- Huange Zhao
- Key Laboratory of Tropical Translational Medicine of Ministry of Education, NHC Key Laboratory of Control of Tropical Disease Control, Hainan Provincial Key Laboratory of Tropical Medicine, School of Tropical Medicine, Hainan Medical University, Haikou, Hainan, 571199
| | - Rong Ji
- Key Laboratory of Tropical Translational Medicine of Ministry of Education, NHC Key Laboratory of Control of Tropical Disease Control, Hainan Provincial Key Laboratory of Tropical Medicine, School of Tropical Medicine, Hainan Medical University, Haikou, Hainan, 571199
| | - Xiangru Zha
- Key Laboratory of Tropical Translational Medicine of Ministry of Education, NHC Key Laboratory of Control of Tropical Disease Control, Hainan Provincial Key Laboratory of Tropical Medicine, School of Tropical Medicine, Hainan Medical University, Haikou, Hainan, 571199
| | - Zhen Xu
- Key Laboratory of Tropical Translational Medicine of Ministry of Education, NHC Key Laboratory of Control of Tropical Disease Control, Hainan Provincial Key Laboratory of Tropical Medicine, School of Tropical Medicine, Hainan Medical University, Haikou, Hainan, 571199
| | - Yingying Lin
- Key Laboratory of Tropical Translational Medicine of Ministry of Education, NHC Key Laboratory of Control of Tropical Disease Control, Hainan Provincial Key Laboratory of Tropical Medicine, School of Tropical Medicine, Hainan Medical University, Haikou, Hainan, 571199
| | - Songlin Zhou
- Key Laboratory of Tropical Translational Medicine of Ministry of Education, NHC Key Laboratory of Control of Tropical Disease Control, Hainan Provincial Key Laboratory of Tropical Medicine, School of Tropical Medicine, Hainan Medical University, Haikou, Hainan, 571199.
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Lohmann SC, Tripathy A, Milionis A, Keller A, Poulikakos D. Effect of Flexibility and Size of Nanofabricated Topographies on the Mechanobactericidal Efficacy of Polymeric Surfaces. ACS Appl Bio Mater 2022; 5:1564-1575. [PMID: 35176858 DOI: 10.1021/acsabm.1c01318] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Driven by the growing threat of antimicrobial resistance, the design of intrinsically bactericidal surfaces has been gaining significant attention. Proposed surface topography designs are often inspired by naturally occurring nanopatterns on insect wings that mechanically damage bacteria via membrane deformation. The stability of and the absence of chemicals in such surfaces support their facile and sustainable employment in avoiding surface-born pathogen transmission. Recently, the deflection of controllably nanofabricated pillar arrays has been shown to strongly affect bactericidal activity, with the limits of mechanical effectiveness of such structures remaining largely unexplored. Here, we examine the limits of softer, commonly used polymeric materials and investigate the interplay between pillar nanostructure sizing and flexibility for effective antibacterial functionality. A facile, scalable, UV nanoimprint lithography method was used to fabricate nanopillar array topographies of variable sizes and flexibilities. It was found that bacterial death on nanopillars in the range of diameters ≤100 nm and Young's moduli ≥1.3 GPa is increased by 3.5- to 5.6-fold, while thicker or softer pillars did not reduce bacterial viability. To further support our findings, we performed a finite element analysis of pillar deformation. It revealed that differences in the amount of stress exerted on bacterial membranes, generated from the stored elastic energy in flexible pillars, contribute to the observed bactericidal performance.
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Affiliation(s)
- Sophie C Lohmann
- Laboratory of Thermodynamics in Emerging Technologies, ETH Zurich, Zurich 8092, Switzerland
| | - Abinash Tripathy
- Laboratory of Thermodynamics in Emerging Technologies, ETH Zurich, Zurich 8092, Switzerland
| | - Athanasios Milionis
- Laboratory of Thermodynamics in Emerging Technologies, ETH Zurich, Zurich 8092, Switzerland
| | - Anja Keller
- Institute of Food, Nutrition and Health, ETH Zurich, Zurich 8092, Switzerland
| | - Dimos Poulikakos
- Laboratory of Thermodynamics in Emerging Technologies, ETH Zurich, Zurich 8092, Switzerland
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Zhao S, Li Z, Linklater DP, Han L, Jin P, Wen L, Chen C, Xing D, Ren N, Sun K, Juodkazis S, Ivanova EP, Jiang L. Programmed Death of Injured Pseudomonas aeruginosa on Mechano-Bactericidal Surfaces. Nano Lett 2022; 22:1129-1137. [PMID: 35040647 DOI: 10.1021/acs.nanolett.1c04243] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Mechano-bactericidal surfaces deliver lethal effects to contacting bacteria. Until now, cell death has been attributed to the mechanical stress imparted to the bacterial cell envelope by the surface nanostructures; however, the process of bacterial death encountering nanostructured surfaces has not been fully illuminated. Here, we perform an in-depth investigation of the mechano-bactericidal action of black silicon (bSi) surfaces toward Gram-negative bacteria Pseudomonas aeruginosa. We discover that the mechanical injury is not sufficient to kill the bacteria immediately due to the survival of the inner plasma membrane. Instead, such sublethal mechanical injury leads to apoptosis-like death (ALD) in affected bacteria. In addition, when the mechanical stress is removed, the self-accumulated reactive oxygen species (ROS) incur poststress ALD in damaged cells in a nonstressed environment, revealing that the mechano-bactericidal actions have sustained physiological effects on the bacterium. This work creates a new facet and can introduce many new regulation tools to this field.
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Affiliation(s)
- Shuo Zhao
- State Key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Zheyu Li
- State Key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China
| | | | - Lin Han
- Key Laboratory of Micro-systems and Micro-structures Manufacturing (Harbin Institute of Technology), Ministry of Education, Harbin 150080, China
| | - Peng Jin
- Key Laboratory of Micro-systems and Micro-structures Manufacturing (Harbin Institute of Technology), Ministry of Education, Harbin 150080, China
| | - Liping Wen
- Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Chuan Chen
- State Key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Defeng Xing
- State Key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Nanqi Ren
- State Key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Kai Sun
- State Key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Saulius Juodkazis
- Optical Sciences Centre, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
| | - Elena P Ivanova
- School of Science, RMIT University, Melbourne, VIC 3000, Australia
| | - Lei Jiang
- Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
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Shi YG, Zhu CM, Li DH, Shi ZY, Gu Q, Chen YW, Wang JQ, Ettelaie R, Chen JS. New Horizons in Microbiological Food Safety: Ultraefficient Photodynamic Inactivation Based on a Gallic Acid Derivative and UV-A Light and Its Application with Electrospun Cyclodextrin Nanofibers. J Agric Food Chem 2021; 69:14961-14974. [PMID: 34843236 DOI: 10.1021/acs.jafc.1c04827] [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] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
An excellent bactericidal effect of octyl gallate (OG)-mediated photodynamic inactivation (PDI) against foodborne pathogens (Escherichia coli and Staphylococcus aureus) was evaluated in relation to the mode of action. UV-A irradiation (wavelength, 365 nm; irradiance, 8.254 ± 0.18 mW/cm2) of the bacterial suspension containing 0.15 mM OG could lead to a >5-log reduction of viable cell counts within 30 min for E. coli and only 5 min for S. aureus. Reactive oxygen species (ROS) formation was considered the main reason for the bactericidal effect of OG + UV-A light treatment because toxic ROS induced by OG-mediated PDI could attack the cellular wall, proteins, and DNA of microbes. Moreover, the bactericidal effect, as well as the yields of ROS, depended on OG concentrations, irradiation time, and laser output power. Furthermore, we prepared an edible photodynamic antimicrobial membrane comprising electrospun cyclodextrin nanofibers (NFs) by embedding OG. The resultant OG/HPβCD NFs (273.6 μg/mL) under UV-A irradiation for 30 min (14.58 J/cm) could cause a great reduction (>5-log) of viable bacterial counts of E. coli. The in situ photodynamic antibacterial activity of OG/HPβCD NF-based packaging was evaluated during the Chinese giant salamander storage. Overall, this research highlights the dual functionalities (antibacterial and photodynamic properties) of OG as both an antibacterial agent and photosensitizer and the effectiveness of electrospun NFs containing OG as an active antibacterial packaging material for food preservation upon UV light illumination.
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Affiliation(s)
- Yu-Gang Shi
- School of Food Science and Biotechnology, Zhejiang Gongshang University, Zhejiang, Hangzhou 310035, China
- Institute of Food Microbiology, Zhejiang Gongshang University, Zhejiang, Hangzhou 310035, China
| | - Chen-Min Zhu
- School of Food Science and Biotechnology, Zhejiang Gongshang University, Zhejiang, Hangzhou 310035, China
- Institute of Food Microbiology, Zhejiang Gongshang University, Zhejiang, Hangzhou 310035, China
| | - Dong-Hui Li
- School of Food Science and Biotechnology, Zhejiang Gongshang University, Zhejiang, Hangzhou 310035, China
- Institute of Food Microbiology, Zhejiang Gongshang University, Zhejiang, Hangzhou 310035, China
| | - Ze-Yu Shi
- College of Biology and Environmental Engineering, Zhejiang Shuren University, Hangzhou 310015, China
| | - Qing Gu
- School of Food Science and Biotechnology, Zhejiang Gongshang University, Zhejiang, Hangzhou 310035, China
- Institute of Food Microbiology, Zhejiang Gongshang University, Zhejiang, Hangzhou 310035, China
| | - Yue-Wen Chen
- School of Food Science and Biotechnology, Zhejiang Gongshang University, Zhejiang, Hangzhou 310035, China
- Institute of Food Microbiology, Zhejiang Gongshang University, Zhejiang, Hangzhou 310035, China
| | - Jie-Qian Wang
- School of Food Science and Biotechnology, Zhejiang Gongshang University, Zhejiang, Hangzhou 310035, China
- Institute of Food Microbiology, Zhejiang Gongshang University, Zhejiang, Hangzhou 310035, China
| | - Rammile Ettelaie
- School of Food Science and Nutrition, University of Leeds, Leeds LS2 9JT, U.K
| | - Jian-She Chen
- School of Food Science and Biotechnology, Zhejiang Gongshang University, Zhejiang, Hangzhou 310035, China
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Fang Y, Zhu Y, Li L, Lai Z, Dong N, Shan A. Biomaterial-Interrelated Bacterial Sweeper: Simplified Self-Assembled Octapeptides with Double-Layered Trp Zipper Induces Membrane Destabilization and Bacterial Apoptosis-Like Death. Small Methods 2021; 5:e2101304. [PMID: 34928043 DOI: 10.1002/smtd.202101304] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Indexed: 06/14/2023]
Abstract
Treatment of microbial-associated infections continues to be hampered by impaired antibacterial efficiency and the variability in nanomedicines. Herein, an octapeptide library with a double-layered zipper, constructed via a systematic arrangement, simplifying the sequence and optimizing the structure (diverse motifs including surfactant-like, central-bola, and end-bola), is assessed in terms of biological efficiency and self-assembly properties. The results indicate that peptides with double-layered Trp zipper exhibit significant antimicrobial activity. Extracellularly, affinity interactions between micelles and bacteria induce the lateral flow of the membrane and electric potential perturbation. Intracellularly, lead molecules cause apoptosis-like death, as indicated by excessive accumulation of reactive oxygen species, generation of a DNA ladder, and upregulation of mazEF expression. Among them, RW-1 performs the best in vivo and in vitro. The intersecting combination of Trp zipper and surfactants possesses overwhelming superiority with respect to bacterial sweepers (therapeutic index [TI] = 52.89), nanostructures (micelles), and bacterial damage compared to RW-2 (central-bola) and RW-3 (end-bola). These findings confirm that the combination of double-layered Trp zipper and surfactants has potential for application as a combined motif for combating microbial infection and connects the vast gap between antimicrobial peptides and self-assembly, such as Jacob's ladder.
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Affiliation(s)
- Yuxin Fang
- Laboratory of Molecular Nutrition and Immunity, The Institute of Animal Nutrition, Northeast Agricultural University, Harbin, 150030, P. R. China
| | - Yunhui Zhu
- Laboratory of Molecular Nutrition and Immunity, The Institute of Animal Nutrition, Northeast Agricultural University, Harbin, 150030, P. R. China
| | - Ling Li
- Laboratory of Molecular Nutrition and Immunity, The Institute of Animal Nutrition, Northeast Agricultural University, Harbin, 150030, P. R. China
| | - Zhenheng Lai
- Laboratory of Molecular Nutrition and Immunity, The Institute of Animal Nutrition, Northeast Agricultural University, Harbin, 150030, P. R. China
| | - Na Dong
- Laboratory of Molecular Nutrition and Immunity, The Institute of Animal Nutrition, Northeast Agricultural University, Harbin, 150030, P. R. China
| | - Anshan Shan
- Laboratory of Molecular Nutrition and Immunity, The Institute of Animal Nutrition, Northeast Agricultural University, Harbin, 150030, P. R. China
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Yu H, Ren X, Yang F, Xie Y, Guo Y, Cheng Y, Yao W. Antimicrobial and anti-dust mite efficacy of Cinnamomum camphora chvar. Borneol essential oil using pilot-plant neutral cellulase-assisted steam distillation. Lett Appl Microbiol 2021; 74:258-267. [PMID: 34822727 DOI: 10.1111/lam.13610] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [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: 07/03/2021] [Revised: 11/11/2021] [Accepted: 11/17/2021] [Indexed: 11/30/2022]
Abstract
Cinnamomum camphora chvar. Borneol essential oil (BEO) was efficiently extracted by using pilot-plant neutral cellulase-assisted steam distillation (NCSD). Borneol, β-cadinene and α-caryophyllene were identified as major components. Bacillus subtilis was the most sensitive bacteria to BEO with the lowest minimal inhibition concentration (MIC) and minimal bactericial concentration (MBC) at 1·75 and 3·50 mg ml-1 , respectively. Antimicrobial activity of the BEO was also reasonably high against Salmonella typhimurium, Escherichia coli and Staphylococcus aureus, but not sensitive against two fungi, i.e. Aspergillus niger and Penicillium aurantiogriseum. Changes in permeability and integrity of cell membrane, damage of cell wall and further leakage out of metabolites and ions were determined as bactericidal mechanisms of BEO against the two gram-positive bacteria. The BEO showed a reasonably high repelling activity of dust mite, which achieved higher than 95% repelling dust mite activity after the treatment of BEO solution at 0·50 mg ml-1 . When the concentration of BEO was higher than 0·50 mg ml-1 , it was B-grade miticide with miticidal activity higher than 95%. Miticidal procedures were characterized as excitation, contraction, relaxation and lastly leading to the death of dust mite. It is speculated that the BEO would cause dehydration and death of dust mite as neuromuscular toxicity.
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Affiliation(s)
- H Yu
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu Province, China.,School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu Province, China.,Joint International Research Laboratory of Food Safety, Jiangnan University, Wuxi, Jiangsu Province, China
| | - X Ren
- Department of Food Science, Yantai Nanshan University, Yantai, Shandong Province, China
| | - F Yang
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu Province, China.,School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu Province, China.,Joint International Research Laboratory of Food Safety, Jiangnan University, Wuxi, Jiangsu Province, China
| | - Y Xie
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu Province, China.,School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu Province, China.,Joint International Research Laboratory of Food Safety, Jiangnan University, Wuxi, Jiangsu Province, China
| | - Y Guo
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu Province, China.,School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu Province, China.,Joint International Research Laboratory of Food Safety, Jiangnan University, Wuxi, Jiangsu Province, China
| | - Y Cheng
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu Province, China.,School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu Province, China.,Joint International Research Laboratory of Food Safety, Jiangnan University, Wuxi, Jiangsu Province, China
| | - W Yao
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu Province, China.,School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu Province, China.,Joint International Research Laboratory of Food Safety, Jiangnan University, Wuxi, Jiangsu Province, China
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11
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Li H, Liang D, Huang J, Cui C, Rao H, Zhao D, Hao J. The Bactericidal Efficacy and the Mechanism of Action of Slightly Acidic Electrolyzed Water on Listeria monocytogenes' Survival. Foods 2021; 10:2671. [PMID: 34828952 DOI: 10.3390/foods10112671] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2021] [Revised: 10/26/2021] [Accepted: 10/29/2021] [Indexed: 11/16/2022] Open
Abstract
In the present work, the bactericidal efficacy and mechanism of slightly acidic electrolyzed water (SAEW) on L. monocytogenes were evaluated. The results showed that the strains of L. monocytogenes were killed completely within 30 s by SAEW whose available chlorine concentration (ACC) was higher than 12 mg/L, and it was confirmed that ACC is the main factor affecting the disinfection efficacy of SAEW. Moreover, our results demonstrated that SAEW could destroy the cell membrane of L. monocytogenes, which was observed by SEM and FT-IR, thus resulting in the leakage of intracellular substances including electrolyte, protein and nucleic acid, and DNA damage. On the other hand, the results found that SAEW could disrupt the intracellular ROS balance of L. monocytogenes by inhibiting the antioxidant enzyme activity, thus promoting the death of L. monocytogenes. In conclusion, the bactericidal mechanism of SAEW on L. monocytogenes was explained from two aspects including the damage of the cell membrane and the breaking of ROS balance.
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12
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Wu S, Subharat P, Brightwell G. A New Insight into the Bactericidal Mechanism of 405 nm Blue Light-Emitting-Diode against Dairy Sourced Cronobacter sakazakii. Foods 2021; 10:1996. [PMID: 34574108 DOI: 10.3390/foods10091996] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [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: 07/29/2021] [Revised: 08/20/2021] [Accepted: 08/23/2021] [Indexed: 12/02/2022] Open
Abstract
(1) Background: Limited evidence exists addressing the action of antimicrobial visible light against Cronobacter sakazakii. Here, we investigated the antimicrobial effects of blue-LED (light emitting diode) at 405 nm against two persistent dairy environment sourced strains of C. sakazakii (ES191 and AGRFS2961). (2) Methods: Beside of investigating cell survival by counts, the phenotypic characteristics of the strains were compared with a reference strain (BAA894) by evaluating the metabolic rate, cell membrane permeability, and ROS level. (3) Results: The two environment isolates (ES191 and AGRFS2961) were more metabolic active and ES191 showed dramatic permeability change of the outer membrane. Notably, we detected varied impacts of different ROS scavengers (catalase > thiourea > superoxide dismutase) during light application, suggesting that hydrogen peroxide (H2O2), the reducing target of catalase, has a key role during blue light inactivation. This finding was further strengthened, following the observation that the combined effect of external H2O2 (sublethal concentration) and 405 nm LED, achieved an additional 2–4 log CFU reduction for both stationary phase and biofilm cells. (4) Conclusions: H2O2 could be used in combination with blue light to enhance bactericidal efficacy and form the basis of a new hurdle technology for controlling C. sakazakii in dairy processing plants.
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Gu L, Sun C, Chen L, Pang S, Hussain MA, Jiang C, Ma J, Jiang Z, Hou J. Non-perfectly Amphipathic α-Helical Structure Containing the XXYXX Sequence Improves the Biological Activity of Bovine α s2-Casein Antimicrobial Peptides. J Agric Food Chem 2020; 68:7520-7529. [PMID: 32569466 DOI: 10.1021/acs.jafc.0c01377] [Citation(s) in RCA: 6] [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] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Non-amphiphilic WIQPKTKVIPYVRYL (WI-6) derived from bovine αs2-casein f (193-207) was modified by a defined mutation method to obtain five engineered peptides with mirror symmetry structures. The five engineered peptide sequences were WF-1 (WFQVKTRVRTKVQFW), FW-2 (FWRRYKKVKKYRRWF), FW-3 (FWQVIKKVKKIVQWF), FK-4 (FKQFYRRVRRYFQKF), and FR-5 (FRQWYRRVRRYWQRF). However, FW-2, FW-3, FK-4, and FR-5 had obvious XXYXX sequences. Among these, FW-3 was demonstrated to have the highest antibacterial activity, which indicates that the non-perfectly amphipathic α-helical structure containing the XXYXX sequence has a better bactericidal effect. Therefore, peptide FW-3 could be widely used as a substitute for antibiotics in food, medicine, and other fields. These findings provide a potential method for designing novel antimicrobial peptides.
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Affiliation(s)
- Liya Gu
- Key Laboratory of Dairy Science, Ministry of Education, College of Food Science, Northeast Agricultural University, Harbin, Heilongjiang 150030, People's Republic of China
| | - Changbao Sun
- Key Laboratory of Dairy Science, Ministry of Education, College of Food Science, Northeast Agricultural University, Harbin, Heilongjiang 150030, People's Republic of China
| | - Lijun Chen
- National Engineering Research Center of Dairy for Maternal & Child Health, Beijing Sanyuan Foods Company, Limited, Beijing 100163, People's Republic of China
| | - Shiyue Pang
- Key Laboratory of Dairy Science, Ministry of Education, College of Food Science, Northeast Agricultural University, Harbin, Heilongjiang 150030, People's Republic of China
| | - Muhammad Altaf Hussain
- Key Laboratory of Dairy Science, Ministry of Education, College of Food Science, Northeast Agricultural University, Harbin, Heilongjiang 150030, People's Republic of China
| | - Chenggang Jiang
- Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Harbin, Heilongjiang 150001, People's Republic of China
| | - Jiage Ma
- Key Laboratory of Dairy Science, Ministry of Education, College of Food Science, Northeast Agricultural University, Harbin, Heilongjiang 150030, People's Republic of China
| | - Zhanmei Jiang
- Key Laboratory of Dairy Science, Ministry of Education, College of Food Science, Northeast Agricultural University, Harbin, Heilongjiang 150030, People's Republic of China
| | - Juncai Hou
- Key Laboratory of Dairy Science, Ministry of Education, College of Food Science, Northeast Agricultural University, Harbin, Heilongjiang 150030, People's Republic of China
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14
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Zheng H, Li H, Zhang J, Fan H, Jia L, Ma W, Ma S, Wang S, You H, Yin Z, Li X. Serum amyloid A exhibits pH dependent antibacterial action and contributes to host defense against Staphylococcus aureus cutaneous infection. J Biol Chem 2019; 295:2570-2581. [PMID: 31819008 DOI: 10.1074/jbc.ra119.010626] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [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: 08/13/2019] [Revised: 12/04/2019] [Indexed: 12/21/2022] Open
Abstract
Serum amyloid A (SAA), one of the major highly conserved acute-phase proteins in most mammals, is predominantly produced by hepatocytes and also by a variety of cells in extrahepatic tissues. It is well-known that the expression of SAA is sharply increased in bacterial infections. However, the exact physiological function of SAA during bacterial infection remains unclear. Herein, we showed that SAA expression significantly increased in abscesses of Staphylococcus aureus cutaneous infected mice, which exert direct antibacterial effects by binding to the bacterial cell surface and disrupting the cell membrane in acidic conditions. Mechanically, SAA disrupts anionic liposomes by spontaneously forming small vesicles or micelles under acidic conditions. Especially, the N-terminal region of SAA is necessary for membrane disruption and bactericidal activity. Furthermore, we found that mice deficient in SAA1/2 were more susceptible to infection by S. aureus In addition, the expression of SAA in infected skin was regulated by interleukin-6. Taken together, these findings support a key role of the SAA in host defense and may provide a novel therapeutic strategy for cutaneous bacterial infection.
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Affiliation(s)
- Han Zheng
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, State Key Laboratory of Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing 100193, China
| | - Haifeng Li
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, State Key Laboratory of Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing 100193, China
| | - Jingyuan Zhang
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, State Key Laboratory of Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing 100193, China
| | - Hanlu Fan
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, State Key Laboratory of Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing 100193, China
| | - Lina Jia
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, State Key Laboratory of Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing 100193, China
| | - Wenqiang Ma
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, State Key Laboratory of Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing 100193, China
| | - Shuoqian Ma
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, State Key Laboratory of Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing 100193, China
| | - Shenghong Wang
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, State Key Laboratory of Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing 100193, China
| | - Hua You
- Affiliated Cancer Hospital and Institute of Guangzhou Medical University, Guangzhou 511436, China
| | - Zhinan Yin
- First Affiliated Hospital, Biomedical Translational Research Institute, Guangdong Province Key Laboratory of Molecular Immunology and Antibody Engineering, Jinan University, Guangzhou 510310, China
| | - Xiangdong Li
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, State Key Laboratory of Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing 100193, China; Affiliated Cancer Hospital and Institute of Guangzhou Medical University, Guangzhou 511436, China.
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15
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Dong N, Wang C, Li X, Guo Y, Li X. Simplified Head-to-Tail Cyclic Polypeptides as Biomaterial-Associated Antimicrobials with Endotoxin Neutralizing and Anti-Inflammatory Capabilities. Int J Mol Sci 2019; 20:ijms20235904. [PMID: 31775224 PMCID: PMC6928678 DOI: 10.3390/ijms20235904] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2019] [Revised: 11/15/2019] [Accepted: 11/20/2019] [Indexed: 12/21/2022] Open
Abstract
The therapeutic application of antimicrobial peptides (AMPs), a potential type of peptide-based biomaterial, is impeded by their poor antimicrobial activity and potential cytotoxicity as a lack of understanding of their structure–activity relationships. In order to comprehensively enhance the antibacterial and clinical application potency of AMPs, a rational approach was applied to design amphiphilic peptides, including head-to-tail cyclic, linear and D-proline antimicrobial peptides using the template (IR)nP(IR)nP (n = 1, 2 and 3). Results showed that these amphiphilic peptides demonstrated antimicrobial activity in a size-dependent manner and that cyclic peptide OIR3, which contained three repeating units (IR)3, had greater antimicrobial potency and cell selectivity than liner peptide IR3, DIR3 with D-Pro and gramicidin S (GS). Surface plasmon resonance and endotoxin neutralization assays indicated that OIR3 had significant endotoxin neutralization capabilities, which suggested that the effects of OIR3 were mediated by binding to lipopolysaccharides (LPS). Using fluorescence spectrometry and electron microscopy, we found that OIR3 strongly promoted membrane disruption and thereby induced cell lysis. In addition, an LPS-induced inflammation assay showed that OIR3 inhibited the pro-inflammatory factor TNF-α in RAW264.7 cells. OIR3 was able to reduce oxazolone-induced skin inflammation in allergic dermatitis mouse model via the inhibition of TNF-α, IL-1β and IL-6 mRNA expression. Collectively, the engineered head-to-tail cyclic peptide OIR3 was considerable potential candidate for use as a clinical therapeutic for the treatment of bacterial infections and skin inflammation.
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Affiliation(s)
- Na Dong
- The Laboratory of Molecular Nutrition and Immunity, Institute of Animal Nutrition, Northeast Agricultural University, Harbin 150030, China; (N.D.); (C.W.); (X.L.)
| | - Chensi Wang
- The Laboratory of Molecular Nutrition and Immunity, Institute of Animal Nutrition, Northeast Agricultural University, Harbin 150030, China; (N.D.); (C.W.); (X.L.)
| | - Xinran Li
- The Laboratory of Molecular Nutrition and Immunity, Institute of Animal Nutrition, Northeast Agricultural University, Harbin 150030, China; (N.D.); (C.W.); (X.L.)
| | - Yuming Guo
- State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China
- Correspondence: ; Tel.: +(86-010)-6273-3900
| | - Xiaoli Li
- Heilongjiang Key Laboratory of Molecular Design and Preparation of Flame Retarded Materials, College of Science, Northeast Forestry University, Harbin 150040, China;
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16
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Chu Z, Hu X, Wang X, Wu J, Dai T, Wang X. Inactivation of Cronobacter sakazakii by blue light illumination and the resulting oxidative damage to fatty acids. Can J Microbiol 2019; 65:922-929. [PMID: 31525298 DOI: 10.1139/cjm-2019-0054] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Blue light (BL) exerts an antimicrobial effect on pathogenic bacteria. It has been hypothesized that its bactericidal activity depends upon the generation of reactive oxygen species (such as anion superoxides) and the resultant cellular damage. However, some aspects of this hypothesis needed to be tested and investigated. Thus, the work conducted herein examined the molecular impact of BL treatment on Cronobacter sakazakii, an emerging foodborne pathogen. The results showed that BL exhibited an efficient bactericidal effect against C. sakazakii. Under a sublethal BL dose, both intracellular anion superoxides and malondialdehyde (a marker of oxidative stress) contents were increased gradually. Moreover, permeability of the outer membrane was increased by approximately 50%, indicating membrane damage. Further investigation revealed alterations to cellular fatty acid profiles, with a decrease and disappearance of unsaturated fatty acids, including C18:2, C16:1, and C18:1. These data indicate that bacterial lipids, especially unsaturated fatty acids, are important molecular targets of BL photo-oxidation. The transcriptional response of bacteria to BL was also studied, and it was found that three genes were upregulated, including genes encoding antioxidants. The current study contributes towards an improved understanding of the bactericidal mechanisms of BL and highlights the importance of lipid and membrane damage.
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Affiliation(s)
- Zhaojuan Chu
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi 214122, P.R. China
| | - Xiaoqing Hu
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi 214122, P.R. China.,International Joint Laboratory on Food Safety, Jiangnan University, Wuxi 214122, P.R. China
| | - Xiaoyuan Wang
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi 214122, P.R. China.,International Joint Laboratory on Food Safety, Jiangnan University, Wuxi 214122, P.R. China
| | - Jiaxin Wu
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi 214122, P.R. China
| | - Tianhong Dai
- Department of Dermatology, Harvard Medical School, Boston, MA 02114, USA.,Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA 02114, USA
| | - Xiaohong Wang
- College of Food Science and Technology, Huazhong Agriculture University, Wuhan 430070, P.R. China
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17
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Dong N, Wang C, Zhang T, Zhang L, Xue C, Feng X, Bi C, Shan A. Bioactivity and Bactericidal Mechanism of Histidine-Rich β-Hairpin Peptide Against Gram-Negative Bacteria. Int J Mol Sci 2019; 20:ijms20163954. [PMID: 31416220 PMCID: PMC6718988 DOI: 10.3390/ijms20163954] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2019] [Revised: 08/06/2019] [Accepted: 08/13/2019] [Indexed: 02/07/2023] Open
Abstract
Antibacterial peptides (APMs) are a new type of antibacterial substance. The relationship between their structure and function remains indistinct; in particular, there is a lack of a definitive and fixed template for designing new antimicrobial peptides. Previous studies have shown that porcine Protegrin-1 (PG-1) exhibits considerable antimicrobial activity and cytotoxicity. In this study, to reduce cytotoxicity and increase cell selectivity, we designed histidine-rich peptides based on the sequence template RR(XY)2XDPGX(YX)2RR-NH2, where X represents I, W, V, and F. The results showed that the peptides form more β-hairpin structures in a lipid-rich environment that mimics cell membranes. Among them, the antimicrobial peptide HV2 showed strong antibacterial activity against Gram-negative strains and almost no toxicity to normal cells. The results of our analysis of its antibacterial mechanism showed that peptide HV2 acts on the bacterial cell membrane to increase its permeability, resulting in cell membrane disruption and death. Furthermore, peptide HV2 inhibited bacterial movement in a concentration-dependent manner and had a more robust anti-inflammatory effect by inhibiting the production of TNF-α. In summary, peptide HV2 exhibits high bactericidal activity and cell selectivity, making it a promising candidate for future use as an antibiotic.
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Affiliation(s)
- Na Dong
- Laboratory of Molecular Nutrition and Immunity. The Institute of Animal Nutrition, Northeast Agricultural University, Harbin 150030, China
| | - Chensi Wang
- Laboratory of Molecular Nutrition and Immunity. The Institute of Animal Nutrition, Northeast Agricultural University, Harbin 150030, China
| | - Tingting Zhang
- Laboratory of Molecular Nutrition and Immunity. The Institute of Animal Nutrition, Northeast Agricultural University, Harbin 150030, China
| | - Lei Zhang
- Laboratory of Molecular Nutrition and Immunity. The Institute of Animal Nutrition, Northeast Agricultural University, Harbin 150030, China
| | - Chenyu Xue
- Laboratory of Molecular Nutrition and Immunity. The Institute of Animal Nutrition, Northeast Agricultural University, Harbin 150030, China
| | - Xinjun Feng
- Laboratory of Molecular Nutrition and Immunity. The Institute of Animal Nutrition, Northeast Agricultural University, Harbin 150030, China
| | - Chongpeng Bi
- Laboratory of Molecular Nutrition and Immunity. The Institute of Animal Nutrition, Northeast Agricultural University, Harbin 150030, China
| | - Anshan Shan
- Laboratory of Molecular Nutrition and Immunity. The Institute of Animal Nutrition, Northeast Agricultural University, Harbin 150030, China.
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18
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Zhou W, Wang Z, Mo H, Zhao Y, Li H, Zhang H, Hu L, Zhou X. Thymol Mediates Bactericidal Activity against Staphylococcus aureus by Targeting an Aldo-Keto Reductase and Consequent Depletion of NADPH. J Agric Food Chem 2019; 67:8382-8392. [PMID: 31271032 DOI: 10.1021/acs.jafc.9b03517] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Staphylococcus aureus is a common pathogen that can cause life-threatening infections. Treatment of antibiotic-resistant S. aureus infection needs effective antibacterial agents. Thymol, a generally recognized safe natural compound, has potential as an alternative to treat S. aureus infections. However, the targets and mechanisms of action of thymol were not fully understood. Bioinformatics analysis showed that IolS, a predicted aldo-keto reductase (AKR) in S. aureus, could be a potential target of thymol. Isothermal titration calorimetry (ITC) analysis demonstrated that thymol directly binds IolS and amino acid residues (Y30 and L33) are essential for such binding. Deletion of IolS or mutation of Y30A and L33A reduced the bactericidal activity of thymol at the concentration of 200 μg/mL, suggesting that thymol mediates bactericidal activity via binding with IolS. Biochemical analysis showed that addition of thymol significantly increased AKR activity of IolS from 1.6 ± 0.1 to 2.4 ± 0.2 U (p < 0.05). The content of NADPH within S. aureus cells decreased significantly from 105 ± 5 to 72 ± 3 pmol/108 cells (p < 0.05) following thymol treatment at the concentration of 200 μg/mL. Importantly, addition of NADPH could alleviate the bactericidal effect of thymol on S. aureus, indicating that the depletion of NADPH is responsible for thymol-mediated bactericidal activity. Overall, these results demonstrated that thymol could directly bind IolS and increase its AKR activity, leading to the depletion of NADPH and bactericidal effect. AKR activity of IolS could be a promising target for the development of new antimicrobials.
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Affiliation(s)
- Wei Zhou
- School of Food Science , Henan Institute of Science and Technology , Xinxiang 453003 , Henan China
| | - Zhen Wang
- School of Food Science , Henan Institute of Science and Technology , Xinxiang 453003 , Henan China
| | - Haizhen Mo
- School of Food Science , Henan Institute of Science and Technology , Xinxiang 453003 , Henan China
| | - Yanyan Zhao
- School of Food Science , Henan Institute of Science and Technology , Xinxiang 453003 , Henan China
| | - Hongbo Li
- School of Food Science , Henan Institute of Science and Technology , Xinxiang 453003 , Henan China
| | - Hao Zhang
- School of Food Science , Henan Institute of Science and Technology , Xinxiang 453003 , Henan China
| | - Liangbin Hu
- School of Food Science , Henan Institute of Science and Technology , Xinxiang 453003 , Henan China
| | - Xiaohui Zhou
- Department of Pathobiology and Veterinary Science , University of Connecticut , Storrs , Connecticut 06269 , United States
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19
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Kumar A, Singh S, Kumar A, Bawankule DU, Tandon S, Singh AK, Verma RS, Saikia D. Chemical composition, bactericidal kinetics, mechanism of action, and anti-inflammatory activity of Isodon melissoides (Benth.) H. Hara essential oil. Nat Prod Res 2019; 35:690-695. [PMID: 30964333 DOI: 10.1080/14786419.2019.1591399] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Present study was aimed to investigate the antibacterial activity, bactericidal mechanism of action, killing kinetics and anti-inflammatory activity of Isodon melissoides (Benth.) H. Hara essential oil. The gas chromatography-flame ionization detector (GC-FID) and gas chromatography-mass spectrometry (GC-MS) analysis revealed the presence of carvacrol (45.4%), p-cymene (11.6%) and thymol (11.3%) as major constituents of the oil. The oil displayed broad spectrum significant antibacterial activity (MIC: 0.13-8.33 ppm; MBC: 0.13->33.34 ppm) against test strains. The oil exhibited a time and dose-dependent bactericidal effect. The oil disrupted the cell membrane by changing the cell membrane permeability. The essential oil significantly decreased the overproduction of proinflammatory cytokines in LPS-induced inflammation in HaCaT cells without any cytotoxic effect. I. melissoides essential oil can be a promising alternative antimicrobial agent for the control of methicillin resistant staphylococci and other pathogenic bacteria tested, and also useful for the topical anti-inflammatory properties.
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Affiliation(s)
- Ajay Kumar
- Molecular Bioprospection Department, CSIR-Central Institute of Medicinal and Aromatic Plants (CIMAP), Lucknow, India
| | - Swati Singh
- Chemical Sciences Division, CSIR-Central Institute of Medicinal and Aromatic Plants (CIMAP), PO CIMAP, Lucknow, India
| | - Anant Kumar
- Molecular Bioprospection Department, CSIR-Central Institute of Medicinal and Aromatic Plants (CIMAP), Lucknow, India
| | - Dnyaneshwar Umrao Bawankule
- Molecular Bioprospection Department, CSIR-Central Institute of Medicinal and Aromatic Plants (CIMAP), Lucknow, India
| | - Sudeep Tandon
- Chemical Sciences Division, CSIR-Central Institute of Medicinal and Aromatic Plants (CIMAP), PO CIMAP, Lucknow, India
| | - Anil Kumar Singh
- Chemical Sciences Division, CSIR-Central Institute of Medicinal and Aromatic Plants (CIMAP), PO CIMAP, Lucknow, India
| | - Ram Swaroop Verma
- Chemical Sciences Division, CSIR-Central Institute of Medicinal and Aromatic Plants (CIMAP), PO CIMAP, Lucknow, India
| | - Dharmendra Saikia
- Molecular Bioprospection Department, CSIR-Central Institute of Medicinal and Aromatic Plants (CIMAP), Lucknow, India
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20
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Dong N, Chou S, Li J, Xue C, Li X, Cheng B, Shan A, Xu L. Short Symmetric-End Antimicrobial Peptides Centered on β-Turn Amino Acids Unit Improve Selectivity and Stability. Front Microbiol 2018; 9:2832. [PMID: 30538681 PMCID: PMC6277555 DOI: 10.3389/fmicb.2018.02832] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2018] [Accepted: 11/05/2018] [Indexed: 11/13/2022] Open
Abstract
Antimicrobial peptides (AMPs) are excellent candidates to combat the increasing number of multi- or pan-resistant pathogens worldwide based on their mechanism of action, which is different from that of antibiotics. In this study, we designed short peptides by fusing an α-helix and β-turn sequence-motif in a symmetric-end template to promote the higher cell selectivity, antibacterial activity and salt-resistance of these structures. The results showed that the designed peptides PQ and PP tended to form an α-helical structure upon interacting with a membrane-mimicking environment. They displayed high cell selectivity toward bacterial cells over eukaryotic cells. Their activities were mostly maintained in the presence of different conditions (salts, serum, heat, and pH), which indicated their stability in vivo. Fluorescence spectroscopy and electron microscopy analyses indicated that PP and PQ killed bacterial cells through membrane pore formation, thereby damaging membrane integrity. This study revealed the potential application of these designed peptides as new candidate antimicrobial agents.
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Affiliation(s)
- Na Dong
- The Laboratory of Molecular Nutrition and Immunity, Institute of Animal Nutrition, Northeast Agricultural University, Harbin, China
| | - Shuli Chou
- The Laboratory of Molecular Nutrition and Immunity, Institute of Animal Nutrition, Northeast Agricultural University, Harbin, China
| | - Jiawei Li
- The Laboratory of Molecular Nutrition and Immunity, Institute of Animal Nutrition, Northeast Agricultural University, Harbin, China
| | - Chenyu Xue
- The Laboratory of Molecular Nutrition and Immunity, Institute of Animal Nutrition, Northeast Agricultural University, Harbin, China
| | - Xinran Li
- The Laboratory of Molecular Nutrition and Immunity, Institute of Animal Nutrition, Northeast Agricultural University, Harbin, China
| | - Baojing Cheng
- The Laboratory of Molecular Nutrition and Immunity, Institute of Animal Nutrition, Northeast Agricultural University, Harbin, China
| | - Anshan Shan
- The Laboratory of Molecular Nutrition and Immunity, Institute of Animal Nutrition, Northeast Agricultural University, Harbin, China
| | - Li Xu
- The Laboratory of Molecular Nutrition and Immunity, Institute of Animal Nutrition, Northeast Agricultural University, Harbin, China
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Sun Y, Zhang Z, Wang S. Study on the Bactericidal Mechanism of Atmospheric-Pressure Low-Temperature Plasma against Escherichia coli and Its Application in Fresh-Cut Cucumbers. Molecules 2018; 23:E975. [PMID: 29690567 DOI: 10.3390/molecules23040975] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [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: 03/31/2018] [Revised: 04/18/2018] [Accepted: 04/20/2018] [Indexed: 12/02/2022] Open
Abstract
Atmospheric-pressure low-temperature plasma (APLTP) was used to study the bactericidal mechanism against Escherichia coli (E. coli) and its application in the sterilization of fresh-cut cucumbers. The morphological changes of E. coli cells subjected to APLTP were observed by scanning electron microscopy (SEM). Cell death was evaluated by fluorescence microscopy (FM). Cell membrane permeability was measured by conductivity changes, and the amount of soluble protein leakage in the bacterial supernatant was determined by measurement of protein concentration. Additionally, the effects of APLTP on the physicochemical and sensory quality of fresh-cut cucumber were studied by assessing the changes of moisture content, soluble solid content (SSC), pH value, color, relative conductivity, malondialdehyde (MDA) level, vitamin C (Vc) content, aroma composition and microstructure. The results showed that the E. coli cell morphology was changed due to the charged particles and active components produced by APLTP. The E. coli cell wall and cell membrane ruptured, cell content leaked out, cells lost the ability to reproduce and self-replicate, and the function of cell metabolism was directly affected and led to E. coli inactivation. In addition, there was no significant effect on physicochemical properties and sensory quality of fresh-cut cucumbers.
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Chen J, Gao M, Wang L, Li S, He J, Qin A, Ren L, Wang Y, Tang BZ. Aggregation-Induced Emission Probe for Study of the Bactericidal Mechanism of Antimicrobial Peptides. ACS Appl Mater Interfaces 2018; 10:11436-11442. [PMID: 29564898 DOI: 10.1021/acsami.7b18221] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Multidrug resistant bacterial infection has become one of the most serious threats to human health. Antimicrobial peptides (AMPs) have been identified as potential alternatives to antibiotics owing to their excellent bactericidal activity. However, the complicated bactericidal mechanism of AMPs is still poorly understood. Fluorescence imaging has many advantages in terms of dynamic monitoring, easy operation, and high sensitivity. In this study, we developed an aggregation-induced emission (AIE)-active probe AMP-2HBT by decorating the antimicrobial peptide HHC36 (KRWWKWWRR) with an AIEgen of 2-(2-hydroxyphenyl)benzothiazole (HBT). This AIE-active probe exhibited an excellent light-up fluorescence after binding with bacteria, enabling a real-time monitoring of the binding process. Moreover, a similar time-dependent bactericidal kinetics was observed for the AIE-active probe and HHC36 peptide, which indicated that the bactericidal activity of the peptide was not compromised by decorating with the AIEgen. The bactericidal mechanism of HHC36 peptide was further investigated by super-resolution fluorescence microscopy, transmission electron microscopy (TEM), and scanning electron microscopy (SEM), which suggested that the probe tended to accumulate on the bacterial membrane and efficiently disrupt the membrane structure to kill both Gram-positive and -negative bacteria. This AIE-active probe thus provided a convenient tool to investigate the bactericidal mechanism of AMPs.
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Affiliation(s)
- Junjian Chen
- National Engineering Research Center for Tissue Restoration and Reconstruction , South China University of Technology , Guangzhou 510006 , China
- School of Materials Science and Engineering , South China University of Technology , Guangzhou 510640 , China
| | - Meng Gao
- National Engineering Research Center for Tissue Restoration and Reconstruction , South China University of Technology , Guangzhou 510006 , China
- School of Materials Science and Engineering , South China University of Technology , Guangzhou 510640 , China
| | - Lin Wang
- National Engineering Research Center for Tissue Restoration and Reconstruction , South China University of Technology , Guangzhou 510006 , China
- School of Materials Science and Engineering , South China University of Technology , Guangzhou 510640 , China
| | - Shiwu Li
- School of Materials Science and Engineering , South China University of Technology , Guangzhou 510640 , China
- Guangdong Innovative Research Team, Center for Aggregation-Induced Emission, State Key Laboratory of Luminescent Materials & Devices , South China University of Technology , Guangzhou 510640 , China
| | - Jingcai He
- National Engineering Research Center for Tissue Restoration and Reconstruction , South China University of Technology , Guangzhou 510006 , China
| | - Anjun Qin
- School of Materials Science and Engineering , South China University of Technology , Guangzhou 510640 , China
- Guangdong Innovative Research Team, Center for Aggregation-Induced Emission, State Key Laboratory of Luminescent Materials & Devices , South China University of Technology , Guangzhou 510640 , China
| | - Li Ren
- School of Materials Science and Engineering , South China University of Technology , Guangzhou 510640 , China
| | - Yingjun Wang
- National Engineering Research Center for Tissue Restoration and Reconstruction , South China University of Technology , Guangzhou 510006 , China
| | - Ben Zhong Tang
- Guangdong Innovative Research Team, Center for Aggregation-Induced Emission, State Key Laboratory of Luminescent Materials & Devices , South China University of Technology , Guangzhou 510640 , China
- Department of Chemistry and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction , The Hong Kong University of Science & Technology , Clear Water Bay, Kowloon , Hong Kong , China
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Dong N, Wang Z, Chou S, Zhang L, Shan A, Jiang J. Antibacterial activities and molecular mechanism of amino-terminal fragments from pig nematode antimicrobial peptide CP-1. Chem Biol Drug Des 2018; 91:1017-1029. [PMID: 29266746 DOI: 10.1111/cbdd.13165] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [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: 06/06/2017] [Revised: 10/18/2017] [Accepted: 12/07/2017] [Indexed: 12/20/2022]
Abstract
High manufacturing costs and weak cell selectivity have limited the clinical application of naturally occurring peptides when faced with an outbreak of drug resistance. To overcome these limitations, a set of antimicrobial peptides was synthesized with the general sequence of (WL)n, where n = 1, 2, 3, and WL was truncated from the N-terminus of Cecropin P1 without initial serine residues. The antimicrobial peptide WL3 exhibited stronger antimicrobial activity against both Gram-negative and Gram-positive microbes than the parental peptide CP-1. WL3 showed no hemolysis even at the highest test concentrations compared to the parental peptide CP-1. The condition sensitivity assays (salts, serum, and trypsin) demonstrated that WL3 had high stability in vitro. Fluorescence spectroscopy and electron microscopy indicated that WL3 killed microbes by means of penetrating the membrane and causing cell lysis. In a mouse model, WL3 was able to significantly reduce the bacteria load in major organs and cytokines (TNF-α, IL-6, and IL-1β) levels in serum. In summary, these findings suggest that WL3, which was modified from a natural antimicrobial peptide, has enormous potential for application as a novel antibacterial agent.
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Affiliation(s)
- Na Dong
- The Laboratory of Molecular Nutrition and Immunity, Institute of Animal Nutrition, Northeast Agricultural University, Harbin, China
| | - Zhihua Wang
- The Laboratory of Molecular Nutrition and Immunity, Institute of Animal Nutrition, Northeast Agricultural University, Harbin, China
| | - Shuli Chou
- The Laboratory of Molecular Nutrition and Immunity, Institute of Animal Nutrition, Northeast Agricultural University, Harbin, China
| | - Licong Zhang
- The Laboratory of Molecular Nutrition and Immunity, Institute of Animal Nutrition, Northeast Agricultural University, Harbin, China
| | - Anshan Shan
- The Laboratory of Molecular Nutrition and Immunity, Institute of Animal Nutrition, Northeast Agricultural University, Harbin, China
| | - Junguang Jiang
- The State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, China
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24
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Pérez-Peinado C, Dias SA, Domingues MM, Benfield AH, Freire JM, Rádis-Baptista G, Gaspar D, Castanho MARB, Craik DJ, Henriques ST, Veiga AS, Andreu D. Mechanisms of bacterial membrane permeabilization by crotalicidin (Ctn) and its fragment Ctn(15-34), antimicrobial peptides from rattlesnake venom. J Biol Chem 2017; 293:1536-1549. [PMID: 29255091 DOI: 10.1074/jbc.ra117.000125] [Citation(s) in RCA: 74] [Impact Index Per Article: 10.6] [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: 09/26/2017] [Revised: 12/11/2017] [Indexed: 12/14/2022] Open
Abstract
Crotalicidin (Ctn), a cathelicidin-related peptide from the venom of a South American rattlesnake, possesses potent antimicrobial, antitumor, and antifungal properties. Previously, we have shown that its C-terminal fragment, Ctn(15-34), retains the antimicrobial and antitumor activities but is less toxic to healthy cells and has improved serum stability. Here, we investigated the mechanisms of action of Ctn and Ctn(15-34) against Gram-negative bacteria. Both peptides were bactericidal, killing ∼90% of Escherichia coli and Pseudomonas aeruginosa cells within 90-120 and 5-30 min, respectively. Studies of ζ potential at the bacterial cell membrane suggested that both peptides accumulate at and neutralize negative charges on the bacterial surface. Flow cytometry experiments confirmed that both peptides permeabilize the bacterial cell membrane but suggested slightly different mechanisms of action. Ctn(15-34) permeabilized the membrane immediately upon addition to the cells, whereas Ctn had a lag phase before inducing membrane damage and exhibited more complex cell-killing activity, probably because of two different modes of membrane permeabilization. Using surface plasmon resonance and leakage assays with model vesicles, we confirmed that Ctn(15-34) binds to and disrupts lipid membranes and also observed that Ctn(15-34) has a preference for vesicles that mimic bacterial or tumor cell membranes. Atomic force microscopy visualized the effect of these peptides on bacterial cells, and confocal microscopy confirmed their localization on the bacterial surface. Our studies shed light onto the antimicrobial mechanisms of Ctn and Ctn(15-34), suggesting Ctn(15-34) as a promising lead for development as an antibacterial/antitumor agent.
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Affiliation(s)
- Clara Pérez-Peinado
- From the Department of Experimental and Health Science, Universitat Pompeu Fabra, Barcelona Biomedical Research Park, 08003 Barcelona, Spain
| | - Susana Almeida Dias
- the Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, 1649-028 Lisboa, Portugal
| | - Marco M Domingues
- the Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, 1649-028 Lisboa, Portugal
| | - Aurélie H Benfield
- the Institute for Molecular Bioscience, University of Queensland, St Lucia, Queensland 4072, Australia
| | - João Miguel Freire
- the Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, 1649-028 Lisboa, Portugal.,the Department of Virology, Institut Pasteur, 75724 Paris, France, and
| | - Gandhi Rádis-Baptista
- From the Department of Experimental and Health Science, Universitat Pompeu Fabra, Barcelona Biomedical Research Park, 08003 Barcelona, Spain.,the Laboratory of Biochemistry and Biotechnology, Institute for Marine Science, Federal University of Ceará, 60165-081 Fortaleza, CE, Brazil
| | - Diana Gaspar
- the Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, 1649-028 Lisboa, Portugal
| | - Miguel A R B Castanho
- the Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, 1649-028 Lisboa, Portugal
| | - David J Craik
- the Institute for Molecular Bioscience, University of Queensland, St Lucia, Queensland 4072, Australia
| | - Sónia Troeira Henriques
- the Institute for Molecular Bioscience, University of Queensland, St Lucia, Queensland 4072, Australia,
| | - Ana Salomé Veiga
- the Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, 1649-028 Lisboa, Portugal,
| | - David Andreu
- From the Department of Experimental and Health Science, Universitat Pompeu Fabra, Barcelona Biomedical Research Park, 08003 Barcelona, Spain,
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25
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Ma Z, Han J, Chang B, Gao L, Lu Z, Lu F, Zhao H, Zhang C, Bie X. Membrane-Active Amphipathic Peptide WRL3 with in Vitro Antibiofilm Capability and in Vivo Efficacy in Treating Methicillin-Resistant Staphylococcus aureus Burn Wound Infections. ACS Infect Dis 2017; 3:820-832. [PMID: 28885829 DOI: 10.1021/acsinfecdis.7b00100] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Methicillin-resistant Staphylococcus aureus (MRSA) has become increasingly prevalent in hospitals, clinics, and the community. MRSA can cause significant and even lethal infections, especially in skin burn wounds. The currently available topical agents have largely failed to eliminate MRSA infections due to resistance. Therefore, there is an urgent need for new and effective approaches for treating MRSA. Here, we show that a novel engineered amphipathic peptide, WRL3 (WLRAFRRLVRRLARGLRR-NH2), exhibits potent antimicrobial activity against MRSA, even in the presence of various salts or serum. The cell selectivity of WRL3 was demonstrated by its ability to specifically eliminate MRSA cells over host cells in a coculture model. Additionally, WRL3 showed a synergistic effect against MRSA when combined with ceftriaxone and effectively inhibited sessile biofilm bacteria growth leading to a reduction in biomass. Fluorescent measurements and microscopic observations of live bacterial cells and artificial membranes revealed that WRL3 exerted its bactericidal activity possibly by destroying the bacterial membrane. In vivo studies indicate that WRL3 is able to control proliferation of MRSA in wound tissue and reduce bioburden and provides a more favorable environment for wound healing. Collectively, our data suggest that WRL3 has enormous potential as a novel antimicrobial agent for the treatment of clinical MRSA infections of skin burn wounds.
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Affiliation(s)
- Zhi Ma
- College of Food Science and Technology, Nanjing Agricultural University, 1 Weigang, Xuanwu
District, Nanjing, Jiangsu 210095, People’s Republic of China
| | - Jinzhi Han
- College of Food Science and Technology, Nanjing Agricultural University, 1 Weigang, Xuanwu
District, Nanjing, Jiangsu 210095, People’s Republic of China
| | - Bingxue Chang
- College of Food Science and Technology, Nanjing Agricultural University, 1 Weigang, Xuanwu
District, Nanjing, Jiangsu 210095, People’s Republic of China
| | - Ling Gao
- College of Food Science and Technology, Nanjing Agricultural University, 1 Weigang, Xuanwu
District, Nanjing, Jiangsu 210095, People’s Republic of China
| | - Zhaoxin Lu
- College of Food Science and Technology, Nanjing Agricultural University, 1 Weigang, Xuanwu
District, Nanjing, Jiangsu 210095, People’s Republic of China
| | - Fengxia Lu
- College of Food Science and Technology, Nanjing Agricultural University, 1 Weigang, Xuanwu
District, Nanjing, Jiangsu 210095, People’s Republic of China
| | - Haizhen Zhao
- College of Food Science and Technology, Nanjing Agricultural University, 1 Weigang, Xuanwu
District, Nanjing, Jiangsu 210095, People’s Republic of China
| | - Chong Zhang
- College of Food Science and Technology, Nanjing Agricultural University, 1 Weigang, Xuanwu
District, Nanjing, Jiangsu 210095, People’s Republic of China
| | - Xiaomei Bie
- College of Food Science and Technology, Nanjing Agricultural University, 1 Weigang, Xuanwu
District, Nanjing, Jiangsu 210095, People’s Republic of China
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Abstract
Surface modification of titanium (Ti) implants are extensively studied in order to obtain prominent biocompatibility and antimicrobial activity, especially preventing implant-associated infection. In this study, Ti substrates surface were modified by graphene oxide (GO) thin film and silver (Ag) nanoparticles via electroplating and ultraviolet reduction methods so as to achieve this purpose. Microstructures, distribution, quantities and spectral peaks of GO and Ag loading on the Ti sheets surface were characterized. GO-Ag-Ti multiphase nanocomposite exhibited excellent antimicrobial ability and anti-adherence performance. Subsequently, morphology, membrane integrity, apoptosis and relative genes expression of bacteria incubated on the Ti samples surface were monitored to reveal the bactericidal mechanism. Additionally, the cytotoxicity of Ti substrates incorporating GO thin film and Ag nanoparticles were investigated. GO-Ag-Ti composite configuration that have outstanding antibacterial properties will provide the foundation to study bone integration in vitro and in vivo in the future.
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Affiliation(s)
- Jianfeng Jin
- State Key Laboratory of Military Stomatology and National Clinical Research Center for Oral Diseases and Shaanxi Engineering Research Center for Dental Materials and Advanced Manufacture, Department of Periodontology, School of Stomatology, The Fourth Military Medical University, Xi’an
- Department of General Dentistry, Kunming Municipal Stomatology Hospital, Kunming
| | - Li Zhang
- State Key Laboratory of Military Stomatology and National Clinical Research Center for Oral Diseases and Shaanxi Key Laboratory of Stomatology, Department of Prosthodontics, School of Stomatology, The Fourth Military Medical University, Xi’an, People’s Republic of China
| | - Mengqi Shi
- State Key Laboratory of Military Stomatology and National Clinical Research Center for Oral Diseases and Shaanxi Key Laboratory of Stomatology, Department of Prosthodontics, School of Stomatology, The Fourth Military Medical University, Xi’an, People’s Republic of China
| | - Yumei Zhang
- State Key Laboratory of Military Stomatology and National Clinical Research Center for Oral Diseases and Shaanxi Key Laboratory of Stomatology, Department of Prosthodontics, School of Stomatology, The Fourth Military Medical University, Xi’an, People’s Republic of China
| | - Qintao Wang
- State Key Laboratory of Military Stomatology and National Clinical Research Center for Oral Diseases and Shaanxi Engineering Research Center for Dental Materials and Advanced Manufacture, Department of Periodontology, School of Stomatology, The Fourth Military Medical University, Xi’an
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Yang XY, Shi T, Du G, Liu W, Yin XF, Sun X, Pan Y, He QY. iTRAQ-Based Proteomics Revealed the Bactericidal Mechanism of Sodium New Houttuyfonate against Streptococcus pneumoniae. J Agric Food Chem 2016; 64:6375-6382. [PMID: 27458754 DOI: 10.1021/acs.jafc.6b02147] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Sodium new houttuyfonate (SNH), an addition product of active ingredient houttuynin from the plant Houttuynia cordata Thunb., inhibits a variety of bacteria, yet the mechanism by which it induces cell death has not been fully understood. In the present study, we utilized iTRAQ-based quantitative proteomics to analyze the protein alterations in Streptococcus pneumoniae in response to SNH treatment. Numerous proteins related to the production of reactive oxygen species (ROS) were found to be up-regulated by SNH, suggesting that ROS pathways may be involved as analyzed via bioinformatics. As reported recently, cellular reactions stimulated by ROS including superoxide anion (O2(•-)), hydrogen peroxide (H2O2), and hydroxyl radicals (OH(•)) have been implicated as mechanisms whereby bactericidal antibiotics kill bacteria. We then validated that SNH killed S. pneumoniae in a dose-dependent manner accompanied by the increasing level of H2O2. On the other hand, the addition of catalase, which can neutralize H2O2 in cells, showed a significant recovery in bacterial survival. These results indicate that SNH indeed induced H2O2 formation to contribute to the cell lethality, providing new insights into the bactericidal mechanism of SNH and expanding our understanding of the common mechanism of killing induced by bactericidal agents.
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Affiliation(s)
- Xiao-Yan Yang
- The First Affiliated Hospital of Jinan University , Guangzhou 510632, China
- Key Laboratory of Functional Protein Research of Guangdong Higher Education Institutes, Institute of Life and Health Engineering, College of Life Science and Technology, Jinan University , Guangzhou 510632, China
| | - Tianyuan Shi
- Key Laboratory of Functional Protein Research of Guangdong Higher Education Institutes, Institute of Life and Health Engineering, College of Life Science and Technology, Jinan University , Guangzhou 510632, China
| | - Gaofei Du
- Key Laboratory of Functional Protein Research of Guangdong Higher Education Institutes, Institute of Life and Health Engineering, College of Life Science and Technology, Jinan University , Guangzhou 510632, China
| | - Wanting Liu
- Key Laboratory of Functional Protein Research of Guangdong Higher Education Institutes, Institute of Life and Health Engineering, College of Life Science and Technology, Jinan University , Guangzhou 510632, China
| | - Xing-Feng Yin
- Key Laboratory of Functional Protein Research of Guangdong Higher Education Institutes, Institute of Life and Health Engineering, College of Life Science and Technology, Jinan University , Guangzhou 510632, China
| | - Xuesong Sun
- Key Laboratory of Functional Protein Research of Guangdong Higher Education Institutes, Institute of Life and Health Engineering, College of Life Science and Technology, Jinan University , Guangzhou 510632, China
| | - Yunlong Pan
- The First Affiliated Hospital of Jinan University , Guangzhou 510632, China
| | - Qing-Yu He
- Key Laboratory of Functional Protein Research of Guangdong Higher Education Institutes, Institute of Life and Health Engineering, College of Life Science and Technology, Jinan University , Guangzhou 510632, China
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