1
|
Shil A, Banerjee A, Roy J, Pal M, Das D, Paul R, Maji BK, Sikdar Nee Bhakta M. The potential antibacterial effects of tea polyphenols. Drug Metab Pers Ther 2024:dmdi-2024-0058. [PMID: 39263725 DOI: 10.1515/dmpt-2024-0058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2024] [Accepted: 08/07/2024] [Indexed: 09/13/2024]
Abstract
The current review of tea and its parts is focused on the antibacterial properties, considering the possible applications and modes of action against bacterial illnesses. It shows the backdrop of antibiotic resistance and the huge demand for antibacterial treatments out there. From the interactions with bacterial components, the theory presented that tea polyphenols are antibacterial and therefore would be a substitute or supplementary therapy to the usual antibiotics. The study highlighted the role of tea polyphenols as potential antibacterial compounds that may interact with various bacterial components and different polyphenolic compounds occurring in tea. Future research directions may be directed toward testing more plant-based sources for antibacterial properties, in vivo validation of the studies, and possible synergistic effects with classical antibiotics. By addressing the controversies and disagreements involved, the present understanding of the topic of tea's antibacterial properties and enable the entry of new ways for fighting microorganisms resistant to antibiotics. In conclusion, this review adds to the growing body of evidence regarding the antimicrobial properties of tea and emphasizes the need for further studies that will allow the full exploitation of its therapeutic potential for countering the rising problem of antibiotic resistance in healthcare.
Collapse
Affiliation(s)
- Aparna Shil
- Department of Physiology, Harimohan Ghose College, Kolkata, West Bengal, India
| | - Arnab Banerjee
- Department of Physiology (UG & PG), Serampore College, Hooghly, West Bengal, India
| | - Jayati Roy
- Department of Physiology (UG & PG), Serampore College, Hooghly, West Bengal, India
| | - Manisha Pal
- Department of Physiology (UG & PG), Serampore College, Hooghly, West Bengal, India
| | - Debasmita Das
- Department of Physiology (UG & PG), Serampore College, Hooghly, West Bengal, India
| | - Rajarshi Paul
- Department of Physiology (UG & PG), Serampore College, Hooghly, West Bengal, India
| | - Bithin Kumar Maji
- Department of Physiology (UG & PG), Serampore College, Hooghly, West Bengal, India
| | - Mausumi Sikdar Nee Bhakta
- Department of Life Sciences, Microbiology, Nutrition and Dietetics Laboratory, Physiology Unit, Presidency University, Kolkata, West Bengal, India
| |
Collapse
|
2
|
Coones RT, Karonen M, Green RJ, Frazier R. Interactions of Galloylated Polyphenols with a Simple Gram-Negative Bacterial Membrane Lipid Model. MEMBRANES 2024; 14:47. [PMID: 38392674 PMCID: PMC10890094 DOI: 10.3390/membranes14020047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2024] [Revised: 01/31/2024] [Accepted: 02/06/2024] [Indexed: 02/24/2024]
Abstract
Differential scanning calorimetry (DSC) was used to explore the interactions of isolated polyphenolic compounds, including (-)-epigallocatechin gallate ((-)-EGCg), tellimagrandins I and II (Tel-I and Tel-II), and 1,2,3,4,6-penta-O-galloyl-d-glucose (PGG), with a model Gram-negative bacterial membrane with a view to investigating their antimicrobial properties. The model membranes comprised 1,2-dipalmitoyl-sn-glycero-3-phosphoethanolamine (DPPE) and 1,2-dipalmitoyl-sn-glycero-3-phospho-(1'-rac-glycerol) (DPPG), fabricated to mimic the domain formation observed in natural membranes, as well as ideally mixed lipid vesicles for the interaction with (-)-EGCg. Polyphenols induced changes in lipid mixing/de-mixing depending on the method of vesicle preparation, as was clearly evidenced by alterations in the lipid transition temperatures. There was a distinct affinity of the polyphenols for the DPPG lipid component, which was attributed to the electrostatic interactions between the polyphenolic galloyl moieties and the lipid headgroups. These interactions were found to operate through either the stabilization of the lipid headgroups by the polyphenols or the insertion of the polyphenols into the membrane itself. Structural attributes of the polyphenols, including the number of galloyl groups, the hydrophobicity quantified by partition coefficients (logP), and structural flexibility, exhibited a correlation with the temperature transitions observed in the DSC measurements. This study furthers our understanding of the intricate interplay between the structural features of polyphenolic compounds and their interactions with model bacterial membrane vesicles towards the exploitation of polyphenols as antimicrobials.
Collapse
Affiliation(s)
- Ryan T Coones
- School of Chemistry, Food and Pharmacy, University of Reading, Harry Nursten Building, Pepper Lane, Whiteknights, Reading RG6 6DZ, UK
| | - Maarit Karonen
- Natural Chemistry Research Group, Department of Chemistry, University of Turku, 20014 Turku, Finland
| | - Rebecca J Green
- School of Chemistry, Food and Pharmacy, University of Reading, Harry Nursten Building, Pepper Lane, Whiteknights, Reading RG6 6DZ, UK
| | - Richard Frazier
- School of Chemistry, Food and Pharmacy, University of Reading, Harry Nursten Building, Pepper Lane, Whiteknights, Reading RG6 6DZ, UK
| |
Collapse
|
3
|
Yu Q, Du F, Belli I, Gomes PA, Sotiropoulos I, Waites CL. Glucocorticoid stress hormones stimulate vesicle-free Tau secretion and spreading in the brain. Cell Death Dis 2024; 15:73. [PMID: 38238309 PMCID: PMC10796385 DOI: 10.1038/s41419-024-06458-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2023] [Revised: 01/07/2024] [Accepted: 01/08/2024] [Indexed: 01/22/2024]
Abstract
Chronic stress and elevated levels of glucocorticoids (GCs), the main stress hormones, accelerate Alzheimer's disease (AD) onset and progression. A major driver of AD progression is the spreading of pathogenic Tau protein between brain regions, precipitated by neuronal Tau secretion. While stress and high GC levels are known to induce intraneuronal Tau pathology (i.e. hyperphosphorylation, oligomerization) in animal models, their role in trans-neuronal Tau spreading is unexplored. Here, we find that GCs promote secretion of full-length, primarily vesicle-free, phosphorylated Tau from murine hippocampal neurons and ex vivo brain slices. This process requires neuronal activity and the kinase GSK3β. GCs also dramatically enhance trans-neuronal Tau spreading in vivo, and this effect is blocked by an inhibitor of Tau oligomerization and type 1 unconventional protein secretion. These findings uncover a potential mechanism by which stress/GCs stimulate Tau propagation in AD.
Collapse
Affiliation(s)
- Qing Yu
- Department of Pathology and Cell Biology, Taub Institute for Research on Alzheimer's Disease and Aging Brain, Columbia University Irving Medical Center, New York, NY, USA
| | - Fang Du
- Department of Pathology and Cell Biology, Taub Institute for Research on Alzheimer's Disease and Aging Brain, Columbia University Irving Medical Center, New York, NY, USA
| | - Irla Belli
- Department of Pathology and Cell Biology, Taub Institute for Research on Alzheimer's Disease and Aging Brain, Columbia University Irving Medical Center, New York, NY, USA
| | - Patricia A Gomes
- Life and Health Sciences Research Institute (ICVS), School of Medicine, University of Minho, Campus de Gualtar, Braga, Portugal
- ICVS/3B's - PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - Ioannis Sotiropoulos
- Life and Health Sciences Research Institute (ICVS), School of Medicine, University of Minho, Campus de Gualtar, Braga, Portugal
- ICVS/3B's - PT Government Associate Laboratory, Braga/Guimarães, Portugal
- Institute of Biosciences and Applications, National Centre for Scientific Research (NCSR) Demokritos, Agia Paraskevi, Greece
| | - Clarissa L Waites
- Department of Pathology and Cell Biology, Taub Institute for Research on Alzheimer's Disease and Aging Brain, Columbia University Irving Medical Center, New York, NY, USA.
- Department of Neuroscience, Columbia University, New York, NY, USA.
| |
Collapse
|
4
|
Hervay NT, Elias D, Habova M, Jacko J, Morvova M, Gbelska Y. Catechin potentiates the antifungal effect of miconazole in Candida glabrata. Folia Microbiol (Praha) 2023; 68:835-842. [PMID: 37145224 PMCID: PMC10689516 DOI: 10.1007/s12223-023-01061-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2023] [Accepted: 04/25/2023] [Indexed: 05/06/2023]
Abstract
The rising number of invasive fungal infections caused by drug-resistant Candida strains is one of the greatest challenges for the development of novel antifungal strategies. The scarcity of available antifungals has drawn attention to the potential of natural products as antifungals and in combinational therapies. One of these is catechins-polyphenolic compounds-flavanols, found in a variety of plants. In this work, we evaluated the changes in the susceptibility of Candida glabrata strain characterized at the laboratory level and clinical isolates using the combination of catechin and antifungal azoles. Catechin alone had no antifungal activity within the concentration range tested. Its use in combination with miconazole resulted in complete inhibition of growth in the sensitive C. glabrata isolate and a significant growth reduction in the azole resistant C. glabrata clinical isolate. Simultaneous use of catechin and miconazole leads to increased intracellular ROS generation. The enhanced susceptibility of C. glabrata clinical isolates to miconazole by catechin was accompanied with the intracellular accumulation of ROS and changes in the plasma membrane permeability, as measured using fluorescence anisotropy, affecting the function of plasma membrane proteins.
Collapse
Affiliation(s)
- Nora Tóth Hervay
- Faculty of Natural Sciences, Department of Microbiology and Virology, Comenius University in Bratislava, Ilkovicova 6, Bratislava, 842 15, Slovak Republic
| | - Daniel Elias
- Faculty of Natural Sciences, Department of Microbiology and Virology, Comenius University in Bratislava, Ilkovicova 6, Bratislava, 842 15, Slovak Republic
| | - Marcela Habova
- Faculty of Natural Sciences, Department of Microbiology and Virology, Comenius University in Bratislava, Ilkovicova 6, Bratislava, 842 15, Slovak Republic
| | - Juraj Jacko
- Faculty of Mathematics, Physics and Informatics, Department of Nuclear Physics and Biophysics, Comenius University in Bratislava, Mlynska Dolina, Bratislava, 842 48, Slovak Republic
| | - Marcela Morvova
- Faculty of Mathematics, Physics and Informatics, Department of Nuclear Physics and Biophysics, Comenius University in Bratislava, Mlynska Dolina, Bratislava, 842 48, Slovak Republic
| | - Yvetta Gbelska
- Faculty of Natural Sciences, Department of Microbiology and Virology, Comenius University in Bratislava, Ilkovicova 6, Bratislava, 842 15, Slovak Republic.
| |
Collapse
|
5
|
Tan BC, Mahyuddin A, Sockalingam SNMP, Zakaria ASI. Preliminary in vitro cytotoxic evaluation of Uncaria gambier (Hunt) Roxb extract as a potential herbal-based pulpotomy medicament. BMC Complement Med Ther 2023; 23:331. [PMID: 37730579 PMCID: PMC10510159 DOI: 10.1186/s12906-023-04163-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Accepted: 09/11/2023] [Indexed: 09/22/2023] Open
Abstract
BACKGROUND The downfall of formocresol as a pulpotomy medicament highlights the importance of cytotoxic evaluation and the establishment of a safe concentration of dental material prior to its usage in the oral cavity. Uncaria gambir is an herbal plant that possesses antimicrobial, anti-inflammatory and antioxidant properties, suggesting its potential as an alternative medicament for pulpotomy. However, there are not many studies published on its cytotoxicity, with some using non-standardised techniques and reported variable outcomes. Here, we investigated the concentration and time-dependent toxicity of Uncaria gambir extract towards the M3CT3-E1 cell line and compared it with the gold standard pulpotomy medicament: mineral trioxide aggregate (MTA). METHODS Uncaria gambir extracts at concentrations ranging from 1000 to 7.8 µg/ml and MTA eluates at 4- and 48 h setting times were prepared. 10% dimethyl sulfoxide (DMSO) and culture media were used as positive and negative controls respectively. Cell viability on days 1, 2, 3 and 7 was analysed using Alamar Blue and Live and Dead Cell assay. Any morphological cellular changes were evaluated using transmission electron microscopes (TEM). Data were analysed using a two-way mixed Analysis of Variance (ANOVA). RESULTS The interaction between the concentration and exposure time on the fluorescence intensity of Uncaria gambir extract and MTA 48 h was found to be statistically significant (p < 0.001). No cytotoxic effects on the cells were exerted by both MTA 48 h and Uncaria gambir extract at a concentration below 500 µg/mL. TEM analysis and Live and Dead Cell assay for both materials were comparable to the negative control. No significant differences in fluorescent intensity were observed between Uncaria gambir extract at 500 µg/mL and MTA 48 h (p > 0.05). CONCLUSION Uncaria gambir extracts at a maximum concentration of 500 μg/mL are non-cytotoxic over time and are comparable to the MTA.
Collapse
Affiliation(s)
- Bee Chin Tan
- Department of Family Oral Health, The National University of Malaysia, Jalan Raja Muda Abdul Aziz, Kuala Lumpur, 50300, Malaysia
| | - Alida Mahyuddin
- Department of Family Oral Health, The National University of Malaysia, Jalan Raja Muda Abdul Aziz, Kuala Lumpur, 50300, Malaysia
| | - S Nagarajan M P Sockalingam
- Department of Family Oral Health, The National University of Malaysia, Jalan Raja Muda Abdul Aziz, Kuala Lumpur, 50300, Malaysia
| | - Ahmad Shuhud Irfani Zakaria
- Department of Family Oral Health, The National University of Malaysia, Jalan Raja Muda Abdul Aziz, Kuala Lumpur, 50300, Malaysia.
| |
Collapse
|
6
|
Waites C, Yu Q, Du F, Belli I, Gomes P, Sotiropoulos I. Glucocorticoid stress hormones stimulate vesicle-free Tau secretion and spreading in the brain. RESEARCH SQUARE 2023:rs.3.rs-3097174. [PMID: 37503224 PMCID: PMC10371092 DOI: 10.21203/rs.3.rs-3097174/v1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/29/2023]
Abstract
Chronic stress and elevated levels of glucocorticoids (GCs), the main stress hormones, accelerate Alzheimer's disease (AD) onset and progression. A major driver of AD progression is the spreading of pathogenic Tau protein between brain regions, precipitated by neuronal Tau secretion. While stress and high GC levels are known to induce intraneuronal Tau pathology (i.e. hyperphosphorylation, oligomerization) in animal models, their role in trans-neuronal Tau spreading is unexplored. Here, we find that GCs promote secretion of full-length, vesicle-free, phosphorylated Tau from murine hippocampal neurons and ex vivo brain slices. This process occurs via type 1 unconventional protein secretion (UPS) and requires neuronal activity and the kinase GSK3b. GCs also dramatically enhance trans-neuronal Tau spreading in vivo, and this effect is blocked by an inhibitor of Tau oligomerization and type 1 UPS. These findings uncover a potential mechanism by which stress/GCs stimulate Tau propagation in AD.
Collapse
Affiliation(s)
| | - Qing Yu
- Columbia University Irving Medical Center
| | - Fang Du
- Columbia University Irving Medical Center
| | - Irla Belli
- Columbia University Irving Medical Center
| | - Patrícia Gomes
- Life and Health Sciences Research Institute (ICVS), School of Medicine, University of Minho, Campus de Gualtar, 4710-057, Braga, Portugal
| | | |
Collapse
|
7
|
Yu Q, Du F, Belli I, Gomes PA, Sotiropoulos I, Waites CL. Glucocorticoid stress hormones stimulate vesicle-free Tau secretion and spreading in the brain. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.06.07.544054. [PMID: 37333306 PMCID: PMC10274779 DOI: 10.1101/2023.06.07.544054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/20/2023]
Abstract
Chronic stress and elevated levels of glucocorticoids (GCs), the main stress hormones, accelerate Alzheimer's disease (AD) onset and progression. A major driver of AD progression is the spreading of pathogenic Tau protein between brain regions, precipitated by neuronal Tau secretion. While stress and high GC levels are known to induce intraneuronal Tau pathology ( i.e. hyperphosphorylation, oligomerization) in animal models, their role in trans-neuronal Tau spreading is unexplored. Here, we find that GCs promote secretion of full-length, vesicle-free, phosphorylated Tau from murine hippocampal neurons and ex vivo brain slices. This process occurs via type 1 unconventional protein secretion (UPS) and requires neuronal activity and the kinase GSK3β. GCs also dramatically enhance trans-neuronal Tau spreading in vivo , and this effect is blocked by an inhibitor of Tau oligomerization and type 1 UPS. These findings uncover a potential mechanism by which stress/GCs stimulate Tau propagation in AD.
Collapse
|
8
|
Effects of a Semisynthetic Catechin on Phosphatidylglycerol Membranes: A Mixed Experimental and Simulation Study. MOLECULES (BASEL, SWITZERLAND) 2023; 28:molecules28010422. [PMID: 36615630 PMCID: PMC9824143 DOI: 10.3390/molecules28010422] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Revised: 12/27/2022] [Accepted: 12/30/2022] [Indexed: 01/06/2023]
Abstract
Catechins have been shown to display a great variety of biological activities, prominent among them are their chemo preventive and chemotherapeutic properties against several types of cancer. The amphiphilic nature of catechins points to the membrane as a potential target for their actions. 3,4,5-Trimethoxybenzoate of catechin (TMBC) is a modified structural analog of catechin that shows significant antiproliferative activity against melanoma and breast cancer cells. Phosphatidylglycerol is an anionic membrane phospholipid with important physical and biochemical characteristics that make it biologically relevant. In addition, phosphatidylglycerol is a preeminent component of bacterial membranes. Using biomimetic membranes, we examined the effects of TMBC on the structural and dynamic properties of phosphatidylglycerol bilayers by means of biophysical techniques such as differential scanning calorimetry, X-ray diffraction and infrared spectroscopy, together with an analysis through molecular dynamics simulation. We found that TMBC perturbs the thermotropic gel to liquid-crystalline phase transition and promotes immiscibility in both phospholipid phases. The modified catechin decreases the thickness of the bilayer and is able to form hydrogen bonds with the carbonyl groups of the phospholipid. Experimental data support the simulated data that locate TMBC as mostly forming clusters in the middle region of each monolayer approaching the carbonyl moiety of the phospholipid. The presence of TMBC modifies the structural and dynamic properties of the phosphatidylglycerol bilayer. The decrease in membrane thickness and the change of the hydrogen bonding pattern in the interfacial region of the bilayer elicited by the catechin might contribute to the alteration of the events taking place in the membrane and might help to understand the mechanism of action of the diverse effects displayed by catechins.
Collapse
|
9
|
Šturm L, Prislan I, González-Ortega R, Mrak P, Snoj T, Anderluh G, Poklar Ulrih N. Interactions of (-)-epigallocatechin-3-gallate with model lipid membranes. BIOCHIMICA ET BIOPHYSICA ACTA. BIOMEMBRANES 2022; 1864:183999. [PMID: 35820494 DOI: 10.1016/j.bbamem.2022.183999] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Revised: 06/01/2022] [Accepted: 06/21/2022] [Indexed: 06/15/2023]
Abstract
(-)-Epigallocatechin-3-gallate (EGCG) is a flavonoid known for its good antioxidant potential and health benefits. It is one of the most intriguing flavonoids, especially because of its specific interactions with model lipid membranes. It was noticed that EGCG might form EGCG rich domains/rafts at certain compositions of lipid membranes. In this article, we investigate whether EGCG forms EGCG rich domains when incorporated in 1,2-dipalmitoyl-sn-glycero-3-phosphatidylcholine (DPPC) liposomes. Our results show that EGCG decreases lipid ordering parameter in ordered membranes and increases it in the case of disordered ones. Also, incorporation of EGCG does not affect the zeta-potential and shape of the liposomes, but it can induce aggregation of liposomes. Our study also demonstrates that liposomes with incorporated EGCG are highly protected against UV-light induced oxidation.
Collapse
Affiliation(s)
- Luka Šturm
- Department of Food Science and Technology, Biotechnical Faculty, University of Ljubljana, Jamnikarjeva 101, 1000 Ljubljana, Slovenia
| | - Iztok Prislan
- Department of Food Science and Technology, Biotechnical Faculty, University of Ljubljana, Jamnikarjeva 101, 1000 Ljubljana, Slovenia
| | - Rodrigo González-Ortega
- Department of Food Science and Technology, Biotechnical Faculty, University of Ljubljana, Jamnikarjeva 101, 1000 Ljubljana, Slovenia; Faculty of Bioscience and Technology for Food Agriculture and Environment, University of Teramo, Via Renato Balzarini 1, 64100 Teramo, Italy
| | - Polona Mrak
- Department of Biology, Biotechnical Faculty, University of Ljubljana, Večna pot 111, 1000 Ljubljana, Slovenia
| | - Tina Snoj
- National Institute of Chemistry, Hajdrihova 19, POBox 660, 1001 Ljubljana, Slovenia
| | - Gregor Anderluh
- National Institute of Chemistry, Hajdrihova 19, POBox 660, 1001 Ljubljana, Slovenia
| | - Nataša Poklar Ulrih
- Department of Food Science and Technology, Biotechnical Faculty, University of Ljubljana, Jamnikarjeva 101, 1000 Ljubljana, Slovenia.
| |
Collapse
|
10
|
Hossain SI, Seppelt M, Nguyen N, Stokes C, Deplazes E. The role of ion-lipid interactions and lipid packing in transient defects caused by phenolic compounds. Biophys J 2022; 121:3520-3532. [PMID: 35932150 PMCID: PMC9515000 DOI: 10.1016/j.bpj.2022.08.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Revised: 07/19/2022] [Accepted: 08/03/2022] [Indexed: 11/16/2022] Open
Abstract
The transient disruption of membranes for the passive permeation of ions or small molecules is a complex process relevant to understanding physiological processes and biotechnology applications. Phenolic compounds are widely studied for their antioxidant and antimicrobial properties, and some of these activities are based on the interactions of the phenolic compound with membranes. Ions are ubiquitous in cells and are known to alter the structure of phospholipid bilayers. Yet, ion-lipid interactions are usually ignored when studying the membrane-altering properties of phenolic compounds. This study aims to assess the role of Ca2+ ions on the membrane-disrupting activity of two phenolic acids and to highlight the role of local changes in lipid packing in forming transient defects or pores. Results from tethered bilayer lipid membrane electrical impedance spectroscopy experiments showed that Ca2+ significantly reduces membrane disruption by caffeic acid methyl ester and caffeic acid. As phenolic acids are known metal chelators, we used UV-vis and fluorescence spectroscopy to exclude the possibility that Ca2+ interferes with membrane disruption by binding to the phenolic compound and subsequently preventing membrane binding. Molecular dynamics simulations showed that Ca2+ but not caffeic acid methyl ester or caffeic acid increases lipid packing in POPC bilayers. The combined data confirm that Ca2+ reduces the membrane-disrupting activity of the phenolic compounds, and that Ca2+-induced changes to lipid packing govern this effect. We discuss our data in the context of ion-induced pores and transient defects and how lipid packing affects membrane disruption by small molecules.
Collapse
Affiliation(s)
- Sheikh I Hossain
- School of Life Sciences, University of Technology Sydney, Ultimo, NSW 2007, Australia; School of Chemistry and Molecular Biosciences, University of Queensland, St Lucia, QLD 4072, Australia
| | - Mathilda Seppelt
- School of Life Sciences, University of Technology Sydney, Ultimo, NSW 2007, Australia; School of Chemistry and Molecular Biosciences, University of Queensland, St Lucia, QLD 4072, Australia
| | - Natalie Nguyen
- School of Life Sciences, University of Technology Sydney, Ultimo, NSW 2007, Australia; School of Chemistry and Molecular Biosciences, University of Queensland, St Lucia, QLD 4072, Australia
| | - Chelsea Stokes
- School of Life Sciences, University of Technology Sydney, Ultimo, NSW 2007, Australia; School of Chemistry and Molecular Biosciences, University of Queensland, St Lucia, QLD 4072, Australia
| | - Evelyne Deplazes
- School of Life Sciences, University of Technology Sydney, Ultimo, NSW 2007, Australia; School of Chemistry and Molecular Biosciences, University of Queensland, St Lucia, QLD 4072, Australia.
| |
Collapse
|
11
|
Mescola A, Ragazzini G, Facci P, Alessandrini A. The potential of AFM in studying the role of the nanoscale amphipathic nature of (lipo)-peptides interacting with lipid bilayers. NANOTECHNOLOGY 2022; 33:432001. [PMID: 35830770 DOI: 10.1088/1361-6528/ac80c9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Accepted: 07/13/2022] [Indexed: 06/15/2023]
Abstract
Antimicrobial peptides (AMPs) and lipopeptides (LPs) represent very promising molecules to fight resistant bacterial infections due to their broad-spectrum of activity, their first target, i.e. the bacterial membrane, and the rapid bactericidal action. For both types of molecules, the action mechanism starts from the membrane of the pathogen agents, producing a disorganization of their phase structure or the formation of pores of different size altering their permeability. This mechanism of action is based on physical interactions more than on a lock-and-key recognition event and it is difficult for the pathogens to rapidly develop an effective resistance. Very small differences in the sequence of both AMPs and LPs might lead to very different effects on the target membrane. Therefore, a correct understanding of their mechanism of action is required with the aim of developing new synthetic peptides, analogues of the natural ones, with specific and more powerful bactericidal activity. Atomic force microscopy (AFM), with its high resolution and the associated force spectroscopy resource, provides a valuable technique to investigate the reorganization of lipid bilayers exposed to antimicrobial or lipopeptides. Here, we present AFM results obtained by ours and other groups on the action of AMPs and LPs on supported lipid bilayers (SLBs) of different composition. We also consider data obtained by fluorescence microscopy to compare the AFM data with another technique which can be used on different lipid bilayer model systems such as SLBs and giant unilamellar vesicles. The outcomes here presented highlight the powerful of AFM-based techniques in detecting nanoscale peptide-membrane interactions and strengthen their use as an exceptional complementary tool toin vivoinvestigations. Indeed, the combination of these approaches can help decipher the mechanisms of action of different antimicrobials and lipopeptides at both the micro and nanoscale levels, and to design new and more efficient antimicrobial compounds.
Collapse
Affiliation(s)
- Andrea Mescola
- CNR-Nanoscience Institute-S3, Via Campi 213/A, I-41125, Modena, Italy
| | - Gregorio Ragazzini
- Department of Physics, Informatics and Mathematics, University of Modena and Reggio Emilia, Via Campi 213/A, I-41125, Modena, Italy
| | - Paolo Facci
- CNR-Ibf, Via De Marini 6, I-16149, Genova, Italy
| | - Andrea Alessandrini
- CNR-Nanoscience Institute-S3, Via Campi 213/A, I-41125, Modena, Italy
- Department of Physics, Informatics and Mathematics, University of Modena and Reggio Emilia, Via Campi 213/A, I-41125, Modena, Italy
| |
Collapse
|
12
|
Hedbrant A, Persson I, Erlandsson A, Wijkander J. Green, Black and Rooibos Tea Inhibit Prostaglandin E2 Formation in Human Monocytes by Inhibiting Expression of Enzymes in the Prostaglandin E2 Pathway. Molecules 2022; 27:397. [PMID: 35056712 PMCID: PMC8778366 DOI: 10.3390/molecules27020397] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Revised: 01/05/2022] [Accepted: 01/06/2022] [Indexed: 02/04/2023] Open
Abstract
The formation of prostaglandin E2 (PGE2) is associated with adverse inflammatory effects. However, long-term treatment with nonsteroidal anti-inflammatory drugs (NSAIDs) comes with risk of severe side effects. Therefore, alternative ways to inhibit PGE2 are warranted. We have investigated the effects of tea extracts and the polyphenols epigallocatechin gallate (EGCG) and quercetin on PGE2 formation, determined by immunoassay, and protein expression, determined by immunoblotting, of cytosolic phospholipase A2 (cPLA2), cyclooxygenase 2 (COX-2) and microsomal PGE synthase-1 (mPGES-1) in human monocytes. Green and black tea extracts, and with a lower potency, Rooibos tea extract, inhibited lipopolysaccharide (LPS) and calcium ionophore-induced PGE2 formation. In addition, all tea extracts inhibited the LPS-induced expression of mPGES-1, and the green and black tea extracts also inhibited, to a lesser extent, COX-2 expression. The tea extracts only marginally reduced cPLA2 expression and had no effect on COX-1 expression. EGCG, present in green and black tea, and quercetin, present in all three teas, also inhibited PGE2 formation and expression of mPGES-1, COX-2 and cPLA2. Cell-based and cell-free assays were also performed to evaluate direct effects on the enzymatic activity of COX and PGE synthases. Mainly, the cell-free assay demonstrated partial inhibition by the tea extracts and polyphenols. However, the inhibition required higher doses compared to the effects demonstrated on protein expression. In conclusion, green and black tea, and to a lesser extent Rooibos tea, are potent inhibitors of PGE2 formation in human monocytes, and mediate their effects by inhibiting the expression of the enzymes responsible for PGE2 formation, especially mPGES-1.
Collapse
Affiliation(s)
- Alexander Hedbrant
- Department of Health Sciences, Karlstad University, SE-651 88 Karlstad, Sweden; (A.H.); (I.P.); (A.E.)
- School of Medical Sciences, Faculty of Medicine and Health, Örebro University, SE-701 82 Örebro, Sweden
| | - Ingrid Persson
- Department of Health Sciences, Karlstad University, SE-651 88 Karlstad, Sweden; (A.H.); (I.P.); (A.E.)
| | - Ann Erlandsson
- Department of Health Sciences, Karlstad University, SE-651 88 Karlstad, Sweden; (A.H.); (I.P.); (A.E.)
- Department of Environmental and Life Sciences/Biology, Karlstad University, SE-651 88 Karlstad, Sweden
| | - Jonny Wijkander
- Department of Health Sciences, Karlstad University, SE-651 88 Karlstad, Sweden; (A.H.); (I.P.); (A.E.)
| |
Collapse
|
13
|
Applications of Catechins in the Treatment of Bacterial Infections. Pathogens 2021; 10:pathogens10050546. [PMID: 34062722 PMCID: PMC8147231 DOI: 10.3390/pathogens10050546] [Citation(s) in RCA: 33] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Revised: 04/26/2021] [Accepted: 04/27/2021] [Indexed: 01/08/2023] Open
Abstract
Tea is the second most commonly consumed beverage worldwide. Along with its aromatic and delicate flavors that make it an enjoyable beverage, studies report numerous health advantages in tea consumption, including applications in antimicrobial therapy. The antimicrobial properties of tea are related to catechin and its derivatives, which are natural flavonoids that are abundant in tea. Increasing evidence from in vitro studies demonstrated antimicrobial effects of catechins on both gram-positive and gram-negative bacteria, and proposed direct and indirect therapeutic mechanisms. Additionally, catechins were reported to be effective anti-virulence agents. Furthermore, a number of studies presented evidence that catechins display synergistic effects with certain antibiotics, thus potentiating the activity of antibiotics in resistant bacteria. Despite their numerous beneficial properties, catechins face many challenges in their development as therapeutic agents, including poor absorption, low bioavailability, and rapid degradation. The introduction of nanobiotechnology provides target-based and stable delivery, which enhances catechin bioavailability and optimizes drug efficacy. As further research continues to focus on overcoming the unresolved challenges, catechins are likely to see additional promising applications in our continual fight against bacterial infections.
Collapse
|
14
|
Nie RZ, Dang MZ, Ge ZZ, Huo YQ, Yu B, Tang SW. Influence of the gallate moiety on the interactions between green tea polyphenols and lipid membranes elucidated by molecular dynamics simulations. Biophys Chem 2021; 274:106592. [PMID: 33887572 DOI: 10.1016/j.bpc.2021.106592] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2020] [Revised: 04/11/2021] [Accepted: 04/12/2021] [Indexed: 02/09/2023]
Abstract
Previous studies suggested that naturally occurring EGCG primarily acted on the bacterial cell membrane then damaged the membrane and the gallate moiety in EGCG was very important to its anti-bacterial activity. However, the detailed mechanisms were still poorly understood. In this paper, EGCG and EGC were selected to study the great contribution of gallate moiety on the anti-bacterial activities of polyphenols. The results indicated that EGCG could penetrate deeper into the POPG lipid bilayer and possess more potent structure-perturbing potency on the POPG lipid bilayer than EGC. We also found that EGCG had the ability to form hydrogen bonds with the deeper inside oxygen atoms in the POPG lipid bilayer and the gallate moiety was the key functional group for EGCG forming hydrogen bonds with the POPG lipid bilayer. Moreover, results from the binding free energy analysis demonstrated that the gallate moiety made great contribution to the high affinity between EGCG and the POPG lipid bilayer. We believed that these findings could yield useful insights into the influence mechanisms of gallate moiety on the anti-bacterial activities of polyphenols.
Collapse
Affiliation(s)
- Rong-Zu Nie
- School of Food Science and Technology, School of Chemical Engineering, Hubei University of Arts and Science, Xiangyang 441053, China; Food Ingredients Engineering Technology Research Center of Hubei, Xiangyang 441053, China
| | - Mei-Zhu Dang
- School of Energy and Intelligence Engineering, Henan University of Animal Husbandry and Economy, Zhengzhou 450002, China
| | - Zhen-Zhen Ge
- School of Food and Bioengineering, Zhengzhou University of Light Industry, Zhengzhou 450001, China
| | - Yin-Qiang Huo
- School of Food Science and Technology, School of Chemical Engineering, Hubei University of Arts and Science, Xiangyang 441053, China; Food Ingredients Engineering Technology Research Center of Hubei, Xiangyang 441053, China
| | - Bo Yu
- School of Food Science and Technology, School of Chemical Engineering, Hubei University of Arts and Science, Xiangyang 441053, China; Food Ingredients Engineering Technology Research Center of Hubei, Xiangyang 441053, China
| | - Shang-Wen Tang
- School of Food Science and Technology, School of Chemical Engineering, Hubei University of Arts and Science, Xiangyang 441053, China; Food Ingredients Engineering Technology Research Center of Hubei, Xiangyang 441053, China.
| |
Collapse
|
15
|
Normalizing polydiacetylene colorimetric assays of vesicle binding across lipid systems. Anal Biochem 2020; 609:113864. [DOI: 10.1016/j.ab.2020.113864] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Revised: 06/24/2020] [Accepted: 07/07/2020] [Indexed: 11/18/2022]
|
16
|
Gastaldo IP, Himbert S, Ram U, Rheinstädter MC. The Effects of Resveratrol, Caffeine, β-Carotene, and Epigallocatechin Gallate (EGCG) on Amyloid- β 25 -- 35 Aggregation in Synthetic Brain Membranes. Mol Nutr Food Res 2020; 64:e2000632. [PMID: 32981185 DOI: 10.1002/mnfr.202000632] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Indexed: 01/08/2023]
Abstract
SCOPE Alzheimer's disease is a neurodegenerative condition marked by the formation and aggregation of amyloid-β (Aβ) peptides. There exists, to this day, no cure or effective prevention for the disease; however, there is evidence that a healthy diet and certain food products can slow down first occurrence and progression. To investigate if food ingredients can interact with peptide aggregates, synthetic membranes that contained aggregates consisting of cross-β sheets of the membrane active fragment A β 25 -- 35 are prepared. METHODS AND RESULTS The impact of resveratrol, found in grapes, caffeine, the main active ingredient in coffee, β-carotene, found in orange fruits and vegetables, and epigallocatechin gallate (EGCG), a component of green tea, on the size and volume fraction of Aβ aggregates is studied using optical and fluorescence microscopy, X-ray diffraction, UV-vis spectroscopy, and molecular dynamics simulations. All compounds are membrane active and spontaneously partitioned in the synthetic brain membranes. While resveratrol and caffeine lead to membrane thickening and reduced membrane fluidity, β-carotene and EGCG preserve or increase fluidity. CONCLUSION Resveratrol and caffeine do not reduce the volume fraction of peptide aggregates while β-carotene significantly reduces plaque size. Interestingly, EGCG dissolves peptide aggregates and significantly decreases the corresponding cross-β and β-sheet signals.
Collapse
Affiliation(s)
- Isabella P Gastaldo
- Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, L8S 4M1, Canada.,Origins Institute, McMaster University, Hamilton, Ontario, L8S 4M1, Canada.,Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, L8S 4M1, Canada
| | - Sebastian Himbert
- Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, L8S 4M1, Canada.,Origins Institute, McMaster University, Hamilton, Ontario, L8S 4M1, Canada
| | - Udbhav Ram
- Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, L8S 4M1, Canada.,Origins Institute, McMaster University, Hamilton, Ontario, L8S 4M1, Canada
| | - Maikel C Rheinstädter
- Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, L8S 4M1, Canada.,Origins Institute, McMaster University, Hamilton, Ontario, L8S 4M1, Canada
| |
Collapse
|
17
|
Sanver D, Sadeghpour A, Rappolt M, Di Meo F, Trouillas P. Structure and Dynamics of Dioleoyl-Phosphatidylcholine Bilayers under the Influence of Quercetin and Rutin. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:11776-11786. [PMID: 32911935 DOI: 10.1021/acs.langmuir.0c01484] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Quercetin and rutin, two widely studied flavonoids with applications foreseen in the sectors of pharmaceutical and cosmetic industries, have been chosen as model compounds for a detailed structural and dynamical investigation onto their influence on fluid lipid bilayers. Combining global small angle X-ray scattering analysis with molecular dynamics, various changes in the properties of dioleoyl-phosphatidylcholine (DOPC) bilayers have been determined. The solubility of quercetin in DOPC membranes is assured up to 12 mol %, whereas rutin, with additional glucose and rhamnose groups, are fully soluble only up to 6 mol %. Both flavonoids induce an increase in membrane undulations and thin the bilayers slightly (<1 Å) in a concentration dependent manner, wherein quercetin shows a stronger effect. Concomitantly, in the order of 2-4%, the adjacent bilayer distance increases with the flavonoid's concentration. Partial molecular areas of quercetin and rutin are determined to be 26 and 51 Å2, respectively. Simulated averaged areas per molecule confirm these estimates. A 60° tilted orientation of quercetin is observed with respect to the bilayer normal, whereas the flavonoid moiety of rutin is oriented more perpendicular (α-angle 30°) to the membrane surface. Both flavonoid moieties are located at a depth of 12 and 16 Å for quercetin and rutin, respectively, while their anionic forms display a location closer to the polar interface. Finally, at both simulated concentrations (1.5 and 12 mol %), DOPC-rutin systems induce a stronger packing of the pure DOPC lipid bilayer, mainly due to stronger attractive electrostatic interactions in the polar lipid head region.
Collapse
Affiliation(s)
- Didem Sanver
- Faculty of Engineering and Architecture, Department of Food Engineering, Necmettin Erbakan University, Konya 42050, Turkey
- School of Food Science and Nutrition, University of Leeds, Leeds LS2 9JT, U.K
| | - Amin Sadeghpour
- School of Food Science and Nutrition, University of Leeds, Leeds LS2 9JT, U.K
- Biomaterials Science Center, Department of Biomedical Engineering, University of Basel, Allschwil 4123, Switzerland
| | - Michael Rappolt
- School of Food Science and Nutrition, University of Leeds, Leeds LS2 9JT, U.K
| | - Florent Di Meo
- INSERM U1248 IPPRITT, University of Limoges, 2 rue du Prof. Descottes, Limoges 87000, France
| | - Patrick Trouillas
- INSERM U1248 IPPRITT, University of Limoges, 2 rue du Prof. Descottes, Limoges 87000, France
- RCPTM, Department of Physical Chemistry, Faculty of Sciences, Palacký University, Olomouc 771 47, Czech Republic
| |
Collapse
|
18
|
Hryniewicz-Jankowska A, Augoff K, Sikorski AF. The role of cholesterol and cholesterol-driven membrane raft domains in prostate cancer. Exp Biol Med (Maywood) 2020; 244:1053-1061. [PMID: 31573840 DOI: 10.1177/1535370219870771] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Membrane rafts are heterogeneous and dynamic domains that are characterized by tight packing of lipids. They are enriched in cholesterol, sphingolipids, and certain types of proteins. Among these are various cell signaling proteins, which indicate that rafts play an important role in cell signal transduction pathways, including some involved in cancer development, progression, and invasiveness. Due to their increased cholesterol content, raft domains exhibit lower fluidity than the surrounding membrane. The cell membranes of some solid tumors, such as breast and prostate cancer, contain higher levels of cholesterol, which means larger raft domain can form in those membranes. This may stimulate signaling pathways to promote tumor growth and progression. This review focuses on the known raft-dependent regulatory mechanisms that promote prostate cancer progression.Impact statementProstate cancer remains the most common malignancy and second most frequent cause of cancer-related death in men. Cholesterol levels are usually higher in prostate cancer cells. This affects the cell membrane composition, with cholesterol and sphingolipid-containing raft membrane domains becoming a greater component. In addition to polar lipids, these domains recruit and regulate certain types of protein, including various cell signaling proteins that are critical to cancer cell survival and invasiveness. This suggests that membrane rafts have a regulatory role in tumor progression, making them a potential target in prostate cancer treatment.
Collapse
Affiliation(s)
| | - Katarzyna Augoff
- Department of Surgical Education, Wrocław Medical University, Wroclaw 50-369, Poland
| | - Aleksander F Sikorski
- Department of Cytobiochemistry, Faculty of Biotechnology, University of Wroclaw, Wroclaw 50-383, Poland
| |
Collapse
|
19
|
Monoalkylated Epigallocatechin-3-gallate (C18-EGCG) as Novel Lipophilic EGCG Derivative: Characterization and Antioxidant Evaluation. Antioxidants (Basel) 2020; 9:antiox9030208. [PMID: 32138219 PMCID: PMC7139963 DOI: 10.3390/antiox9030208] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2020] [Revised: 02/28/2020] [Accepted: 02/28/2020] [Indexed: 12/19/2022] Open
Abstract
Epigallocatechin-3-gallate (EGCG) has the highest antioxidant activity compared to the others catechins of green tea. However, the beneficial effects are mainly limited by its poor membrane permeability. A derivatization strategy to increase the EGCG interaction with lipid membranes is considered as one feasible approach to expand its application in lipophilic media, in particular the cellular absorption. At this purpose the hydrophilic EGCG was modified by inserting an aliphatic C18 chain linked to the gallate ring by an ethereal bond, the structure determined by NMR (Nuclear Magnetic Resonance) and confirmed by Density Functional Theory (DFT) calculations. The in vitro antioxidant activity of the mono-alkylated EGCG (C18-EGCG) was studied by the DPPH and Thiobarbituric Acid Reactive Substances (TBARS) assays, and its ability to protect cells towards oxidative stress was evaluated in Adult Retinal Pigmented Epithelium (ARPE-19) cells. Molecular Dynamics (MD) simulation and liposomal/buffer partition were used to study the interaction of the modified and unmodified antioxidants with a cell membrane model: the combined experimental-in silico approach shed light on the higher affinity of C18-EGCG toward lipid bilayer. Although the DPPH assay stated that the functionalization decreases the EGCG activity against free radicals, from cellular experiments it resulted that the lipid moiety increases the antioxidant protection of the new lipophilic derivative.
Collapse
|
20
|
Merezhko M, Brunello CA, Yan X, Vihinen H, Jokitalo E, Uronen RL, Huttunen HJ. Secretion of Tau via an Unconventional Non-vesicular Mechanism. Cell Rep 2019; 25:2027-2035.e4. [PMID: 30463001 DOI: 10.1016/j.celrep.2018.10.078] [Citation(s) in RCA: 102] [Impact Index Per Article: 20.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2018] [Revised: 09/26/2018] [Accepted: 10/19/2018] [Indexed: 10/27/2022] Open
Abstract
Tauopathies are characterized by cerebral accumulation of Tau protein aggregates that appear to spread throughout the brain via a cell-to-cell transmission process that includes secretion and uptake of pathological Tau, followed by templated misfolding of normal Tau in recipient cells. Here, we show that phosphorylated, oligomeric Tau clusters at the plasma membrane in N2A cells and is secreted in vesicle-free form in an unconventional process sensitive to changes in membrane properties, particularly cholesterol and sphingomyelin content. Cell surface heparan sulfate proteoglycans support Tau secretion, possibly by facilitating its release after membrane penetration. Notably, secretion of endogenous Tau from primary cortical neurons is mediated, at least partially, by a similar mechanism. We suggest that Tau is released from cells by an unconventional secretory mechanism that involves its phosphorylation and oligomerization and that membrane interaction may help Tau to acquire properties that allow its escape from cells directly through the plasma membrane.
Collapse
Affiliation(s)
- Maria Merezhko
- Neuroscience Center, HiLIFE, University of Helsinki, 00014 Helsinki, Finland
| | - Cecilia A Brunello
- Neuroscience Center, HiLIFE, University of Helsinki, 00014 Helsinki, Finland
| | - Xu Yan
- Neuroscience Center, HiLIFE, University of Helsinki, 00014 Helsinki, Finland
| | - Helena Vihinen
- Electron Microscopy Unit, Institute of Biotechnology, HiLIFE, University of Helsinki, 00014 Helsinki, Finland
| | - Eija Jokitalo
- Electron Microscopy Unit, Institute of Biotechnology, HiLIFE, University of Helsinki, 00014 Helsinki, Finland
| | - Riikka-Liisa Uronen
- Neuroscience Center, HiLIFE, University of Helsinki, 00014 Helsinki, Finland
| | - Henri J Huttunen
- Neuroscience Center, HiLIFE, University of Helsinki, 00014 Helsinki, Finland.
| |
Collapse
|
21
|
Surface Functionalization of Bioactive Glasses with Polyphenols from Padina pavonica Algae and In Situ Reduction of Silver Ions: Physico-Chemical Characterization and Biological Response. COATINGS 2019. [DOI: 10.3390/coatings9060394] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Bioactive glasses (BGs) are attractive materials for bone replacement due to their tailorable chemical composition that is able to promote bone healing and repair. Accordingly, many attempts have been introduced to further improve BGs’ biological behavior and to protect them from bacterial infection, which is nowadays the primary reason for implant failure. Polyphenols from natural products have been proposed as a novel source of antibacterial agents, whereas silver is a well-known antibacterial agent largely employed due to its broad-ranged activity. Based on these premises, the surface of a bioactive glass (CEL2) was functionalized with polyphenols extracted from the Egyptian algae Padina pavonica and enriched with silver nanoparticles (AgNPs) using an in situ reduction technique only using algae extract. We analyzed the composite’s morphological and physical-chemical characteristics using FE-SEM, EDS, XPS and Folin–Ciocalteau; all analyses confirmed that both algae polyphenols and AgNPs were successfully loaded together onto the CEL2 surface. Antibacterial analysis revealed that the presence of polyphenols and AgNPs significantly reduced the metabolic activity (>50%) of Staphylococcus aureus biofilm in comparison with bare CEL2 controls. Finally, we verified the composite’s cytocompatibility with human osteoblasts progenitors that were selected as representative cells for bone healing advancement.
Collapse
|
22
|
Mescola A, Marín-Medina N, Ragazzini G, Accolla M, Alessandrini A. Magainin-H2 effects on the permeabilization and mechanical properties of giant unilamellar vesicles. J Colloid Interface Sci 2019; 553:247-258. [PMID: 31207545 DOI: 10.1016/j.jcis.2019.06.028] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2019] [Revised: 05/28/2019] [Accepted: 06/09/2019] [Indexed: 10/26/2022]
Abstract
Among the potential novel therapeutics to treat bacterial infections, antimicrobial peptides (AMPs) are a very promising substitute due to their broad-spectrum activity and rapid bactericidal action. AMPs strongly interact with the bacterial membrane, and the need to have a correct understanding of the interaction between AMPs and lipid bilayers at a molecular level prompted a wealth of experimental and theoretical studies exploiting a variety of AMPs. Here, we studied the effects of magainin H2 (Mag H2), an analog of the well-known magainin 2 (wt Mag 2) AMP endowed with a higher degree of hydrophobicity, on giant unilamellar vesicles (GUVs) concentrating on its permeabilization activity and the effect on the lipid bilayer mechanical properties. We demonstrated that the increased hydrophobicity of Mag H2 affects its selectivity conferring a strong permeabilization activity also on zwitterionic lipid bilayers. Moreover, when lipid mixtures including PG lipids are considered, PG has a protective effect, at variance from wt Mag 2, suggesting that for Mag H2 the monolayer curvature could prevail over the peptide-membrane electrostatic interaction. We then mechanically characterized GUVs by measuring the effect of Mag H2 on the bending constant of lipid bilayers by flickering spectroscopy and, by using micropipette aspiration technique, we followed the steps leading to vesicle permeabilization. We found that Mag H2, notwithstanding its enhanced hydrophobicity, has a pore formation mechanism compatible with the toroidal pore model similar to that of wt Mag 2.
Collapse
Affiliation(s)
- Andrea Mescola
- CNR-Nanoscience Institute-S3, Via Campi 213/A, 41125 Modena, Italy.
| | - Nathaly Marín-Medina
- Department of Physics, University of Los Andes, Carrera 1 N° 18A - 12, Bogotá, Colombia.
| | - Gregorio Ragazzini
- CNR-Nanoscience Institute-S3, Via Campi 213/A, 41125 Modena, Italy; Department of Physics, Informatics and Mathematics, University of Modena and Reggio Emilia, Via Campi 213/A, 41125 Modena, Italy.
| | - Maurizio Accolla
- Department of Physics, Informatics and Mathematics, University of Modena and Reggio Emilia, Via Campi 213/A, 41125 Modena, Italy
| | - Andrea Alessandrini
- CNR-Nanoscience Institute-S3, Via Campi 213/A, 41125 Modena, Italy; Department of Physics, Informatics and Mathematics, University of Modena and Reggio Emilia, Via Campi 213/A, 41125 Modena, Italy.
| |
Collapse
|
23
|
Borisova MP, Kataev AA, Sivozhelezov VS. Action of tannin on cellular membranes: Novel insights from concerted studies on lipid bilayers and native cells. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2019; 1861:1103-1111. [PMID: 30926363 DOI: 10.1016/j.bbamem.2019.03.017] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2018] [Revised: 03/05/2019] [Accepted: 03/25/2019] [Indexed: 10/27/2022]
Abstract
Hydrolyzable tannin (3,6-bis-O-digalloyl-1,2,4-tri-O-galloyl-β-d-glucose) has a dual effect on the cell membrane: (1) it binds to a plasmalemmal protein of the Chara corallina cell (C50 = 2.7 ± 0.3 μM) and (2) it forms ionic channels in the lipid membrane. Based on these facts, a molecular model for the interaction of tannins with the cell membrane is proposed. The model suggests that the molecules of hydrolyzable tannin bind electrostatically to the outer groups of the membrane protein responsible for the Ca2+-dependent chloride current and blocks it. Some tannin molecules penetrate into the hydrophobic region of the membrane, and when a particular concentration is reached, they form ion-conducting structures selective toward Cl-.
Collapse
Affiliation(s)
- Marina P Borisova
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Pushchino, Moscow region, 142290, Russia.
| | - Anatoly A Kataev
- Institute of Cell Biophysics, Russian Academy of Sciences, Pushchino, Moscow region 142290, Russia
| | - Victor S Sivozhelezov
- Institute of Cell Biophysics, Russian Academy of Sciences, Pushchino, Moscow region 142290, Russia
| |
Collapse
|
24
|
Pires F, Geraldo VPN, Rodrigues B, Granada-Flor AD, de Almeida RFM, Oliveira ON, Victor BL, Machuqueiro M, Raposo M. Evaluation of EGCG Loading Capacity in DMPC Membranes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:6771-6781. [PMID: 31006246 DOI: 10.1021/acs.langmuir.9b00372] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Catechins are molecules with potential use in different pathologies such as diabetes and cancer, but their pharmaceutical applications are often hindered by their instability in the bloodstream. This issue can be circumvented using liposomes as their nanocarriers for in vivo delivery. In this work, we studied the molecular details of (-)-epigallocatechin-3-gallate (EGCG) interacting with 1,2-dimyristoyl- sn-glycero-3-phosphocholine (DMPC) monolayer/bilayer systems to understand the catechin loading ability and liposome stability, using experimental and computational techniques. The molecular dynamics simulations show the EGCG molecules deep inside the lipid bilayer, positioned below the lipid ester groups, generating a concentration-dependent lipid condensation. This effect was also inferred from the surface pressure isotherms of DMPC monolayers. In the polarization-modulated infrared reflection absorption spectra assays, the predominant effect at higher concentrations of EGCG (e.g., 20 mol %) was an increase in lipid tail disorder. The steady-state fluorescence data confirmed this disordered state, indicating that the catechin-induced liposome aggregation outweighs the condensation effects. Therefore, by adding more than 10 mol % EGCG to the liposomes, a destabilization of the vesicles occurs with the ensuing release of entrapped catechins. The loading capacity for DMPC seems to be limited by its disordered lipid arrangements, typical of a fluid phase. To further increase the clinical usefulness of liposomes, lipid bilayers with more stable and organized assemblies should be employed to avoid aggregation at large concentrations of catechin.
Collapse
Affiliation(s)
- Filipa Pires
- Departamento de Física, CEFITEC, Faculdade de Ciências e Tecnologia , Universidade Nova de Lisboa , 2829-516 Caparica , Portugal
| | - Vananélia P N Geraldo
- Instituto de Física de São Carlos , Universidade de São Paulo , 13560-970 Sao Carlos , Brazil
| | - Bárbara Rodrigues
- Departamento de Física, CEFITEC, Faculdade de Ciências e Tecnologia , Universidade Nova de Lisboa , 2829-516 Caparica , Portugal
| | - António de Granada-Flor
- Departamento de Química e Bioquímica, Centro de Química e Bioquímica , Faculdade de Ciências da Universidade de Lisboa , Campo Grande, 1749-016 Lisboa , Portugal
| | - Rodrigo F M de Almeida
- Departamento de Química e Bioquímica, Centro de Química e Bioquímica , Faculdade de Ciências da Universidade de Lisboa , Campo Grande, 1749-016 Lisboa , Portugal
| | - Osvaldo N Oliveira
- Instituto de Física de São Carlos , Universidade de São Paulo , 13560-970 Sao Carlos , Brazil
| | - Bruno L Victor
- Departamento de Química e Bioquímica, Centro de Química e Bioquímica , Faculdade de Ciências da Universidade de Lisboa , Campo Grande, 1749-016 Lisboa , Portugal
| | - Miguel Machuqueiro
- Departamento de Química e Bioquímica, Centro de Química e Bioquímica , Faculdade de Ciências da Universidade de Lisboa , Campo Grande, 1749-016 Lisboa , Portugal
| | - Maria Raposo
- Departamento de Física, CEFITEC, Faculdade de Ciências e Tecnologia , Universidade Nova de Lisboa , 2829-516 Caparica , Portugal
| |
Collapse
|
25
|
Pires F, Geraldo VP, Antunes A, Marletta A, Oliveira ON, Raposo M. Effect of blue light irradiation on the stability of phospholipid molecules in the presence of epigallocatechin-3-gallate. Colloids Surf B Biointerfaces 2019; 177:50-57. [DOI: 10.1016/j.colsurfb.2019.01.042] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2018] [Revised: 01/05/2019] [Accepted: 01/22/2019] [Indexed: 11/29/2022]
|
26
|
Encapsulation of (─)-epigallocatechin-3-gallate (EGCG) in solid lipid nanoparticles for food applications. J FOOD ENG 2019. [DOI: 10.1016/j.jfoodeng.2018.09.008] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
|
27
|
Ewins E, Lira RB, Zhang W, Yuan J, Antonietti M, Robinson T, Dimova R. Poly(Ionic Liquid) Nanoparticles Selectively Disrupt Biomembranes. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2019; 6:1801602. [PMID: 30828532 PMCID: PMC6382306 DOI: 10.1002/advs.201801602] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/14/2018] [Revised: 11/29/2018] [Indexed: 06/09/2023]
Abstract
Polymer-based nanoparticles have an increasing presence in research due to their attractive properties, such as flexible surface functionality design and the ability to scale up production. Poly(ionic liquid) (PIL) nanoparticles of size below 50 nm are very unique in terms of their high charge density and internal onion-like morphology. The interaction between PIL nanoparticles and giant unilamellar vesicles (GUVs) of various surface charge densities is investigated. GUVs represent a convenient model system as they mimic the size and curvature of plasma membranes, while simultaneously offering direct visualization of the membrane response under the microscope. Incubating PIL nanoparticles with GUVs results in poration of the lipid membrane in a concentration- and charge-dependent manner. A critical poration concentration of PILs is located and the interactions are found to be analogous to those of antimicrobial peptides. Microbial mimetic membranes are already affected at submicromolar PIL concentrations where contrast loss is observed due to sugar exchange across the membrane, while at high concentrations the collapse of vesicles is observed. Finally, a confocal microscopy-based approach assessing the particle permeation through the membrane is reported and a mechanism based on bilayer frustration and pore stabilization via particle integration in the membrane is proposed.
Collapse
Affiliation(s)
- Eleanor Ewins
- Department of Theory & Bio‐SystemsMax Planck Institute of Colloids and InterfacesScience Park Golm14424PotsdamGermany
| | - Rafael B. Lira
- Department of Theory & Bio‐SystemsMax Planck Institute of Colloids and InterfacesScience Park Golm14424PotsdamGermany
| | - Weiyi Zhang
- Department of Colloid ChemistryMax Planck Institute of Colloids and InterfacesScience Park Golm14424PotsdamGermany
| | - Jiayin Yuan
- Department of Colloid ChemistryMax Planck Institute of Colloids and InterfacesScience Park Golm14424PotsdamGermany
| | - Markus Antonietti
- Department of Colloid ChemistryMax Planck Institute of Colloids and InterfacesScience Park Golm14424PotsdamGermany
| | - Tom Robinson
- Department of Theory & Bio‐SystemsMax Planck Institute of Colloids and InterfacesScience Park Golm14424PotsdamGermany
| | - Rumiana Dimova
- Department of Theory & Bio‐SystemsMax Planck Institute of Colloids and InterfacesScience Park Golm14424PotsdamGermany
| |
Collapse
|
28
|
Lee MT, Yang PY, Charron NE, Hsieh MH, Chang YY, Huang HW. Comparison of the Effects of Daptomycin on Bacterial and Model Membranes. Biochemistry 2018; 57:5629-5639. [PMID: 30153001 DOI: 10.1021/acs.biochem.8b00818] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Daptomycin is a phosphatidylglycerol specific, calcium-dependent membrane-active antibiotic that has been approved for the treatment of Gram-positive infections. A recent Bacillus subtilis study found that daptomycin clustered into fluid lipid domains of bacterial membranes and the membrane binding was correlated with dislocation of peripheral membrane proteins and depolarization of membrane potential. In particular, the study disproved the existence of daptomycin ion channels. Our purpose here is to study how daptomycin interacts with lipid bilayers to understand the observed phenomena on bacterial membranes. We performed new types of experiments using aspirated giant vesicles with an ion leakage indicator, making comparisons between daptomycin and ionomycin, performing vesicle-vesicle transfers, and measuring daptomycin binding to fluid phase versus gel phase bilayers and bilayers including cholesterol. Our findings are entirely consistent with the observations for bacterial membranes. In addition, daptomycin is found to cause ion leakage through the membrane only if its concentration in the membrane is over a certain threshold. The ion leakage caused by daptomycin is transient. It occurs only when daptomycin binds the membrane for the first time; afterward, they cease to induce ion leakage. The ion leakage effect of daptomycin cannot be transferred from one membrane to another. The level of membrane binding of daptomycin is reduced in the gel phase versus the fluid phase. Cholesterol also weakens the membrane binding of daptomycin. The combination of membrane concentration threshold and differential binding is significant. This could be a reason why daptomycin discriminates between eukaryotic and prokaryotic cell membranes.
Collapse
Affiliation(s)
- Ming-Tao Lee
- National Synchrotron Radiation Research Center , Hsinchu , Taiwan 300.,Department of Physics , National Central University , Jhongli , Taiwan 320
| | - Pei-Yin Yang
- Department of Physics and Astronomy , Rice University , Houston , Texas 77005 , United States
| | - Nicholas E Charron
- Department of Physics and Astronomy , Rice University , Houston , Texas 77005 , United States
| | - Meng-Hsuan Hsieh
- Institute of Biotechnology , National Taiwan University , Taipei , Taiwan 10617
| | - Yu-Yung Chang
- National Synchrotron Radiation Research Center , Hsinchu , Taiwan 300
| | - Huey W Huang
- Department of Physics and Astronomy , Rice University , Houston , Texas 77005 , United States
| |
Collapse
|
29
|
Matsuzaki T, Matsumoto S, Kasai T, Yoshizawa E, Okamoto S, Yoshikawa HY, Taniguchi H, Takebe T. Defining Lineage-Specific Membrane Fluidity Signatures that Regulate Adhesion Kinetics. Stem Cell Reports 2018; 11:852-860. [PMID: 30197117 PMCID: PMC6178887 DOI: 10.1016/j.stemcr.2018.08.010] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2018] [Revised: 08/10/2018] [Accepted: 08/11/2018] [Indexed: 12/13/2022] Open
Abstract
Cellular membrane fluidity is a critical modulator of cell adhesion and migration, prompting us to define the systematic landscape of lineage-specific cellular fluidity throughout differentiation. Here, we have unveiled membrane fluidity landscapes in various lineages ranging from human pluripotency to differentiated progeny: (1) membrane rigidification precedes the exit from pluripotency, (2) membrane composition modulates activin signaling transmission, and (3) signatures are relatively germ layer specific presumably due to unique lipid compositions. By modulating variable lineage-specific fluidity, we developed a label-free “adhesion sorting (AdSort)” method with simple cultural manipulation, effectively eliminating pluripotent stem cells and purifying target population as a result of the over 1,150 of screened conditions combining compounds and matrices. These results underscore the important role of tunable membrane fluidity in influencing stem cell maintenance and differentiation that can be translated into lineage-specific cell purification strategy. Membrane rigidification precedes the exit from pluripotency Germ layer-specific membrane fluidity signature exists Identification of polyphenols as a membrane fluidity modulator Fluidity-based adhesion sorting purify differentiated progeny from pluripotency
Collapse
Affiliation(s)
- Takahisa Matsuzaki
- Institute of Research, Tokyo Medical and Dental University (TMDU), 15-45 Yushima, Bunkyo-ku, Tokyo 113-8510, Japan; Department of Regenerative Medicine, Yokohama City University Graduate School of Medicine, Kanazawa-ku 3-9, Yokohama, Kanagawa 236-0004, Japan
| | - Shinya Matsumoto
- Department of Regenerative Medicine, Yokohama City University Graduate School of Medicine, Kanazawa-ku 3-9, Yokohama, Kanagawa 236-0004, Japan
| | - Toshiharu Kasai
- Department of Regenerative Medicine, Yokohama City University Graduate School of Medicine, Kanazawa-ku 3-9, Yokohama, Kanagawa 236-0004, Japan
| | - Emi Yoshizawa
- Department of Regenerative Medicine, Yokohama City University Graduate School of Medicine, Kanazawa-ku 3-9, Yokohama, Kanagawa 236-0004, Japan
| | - Satoshi Okamoto
- Department of Regenerative Medicine, Yokohama City University Graduate School of Medicine, Kanazawa-ku 3-9, Yokohama, Kanagawa 236-0004, Japan
| | - Hiroshi Y Yoshikawa
- Department of Chemistry, Saitama University, Shimo-okubo 255, Sakura-ku, Saitama 338-8570, Japan
| | - Hideki Taniguchi
- Department of Regenerative Medicine, Yokohama City University Graduate School of Medicine, Kanazawa-ku 3-9, Yokohama, Kanagawa 236-0004, Japan; Advanced Medical Research Center, Yokohama City University, Kanazawa-ku 3-9, Yokohama, Kanagawa 236-0004, Japan
| | - Takanori Takebe
- Institute of Research, Tokyo Medical and Dental University (TMDU), 15-45 Yushima, Bunkyo-ku, Tokyo 113-8510, Japan; Department of Regenerative Medicine, Yokohama City University Graduate School of Medicine, Kanazawa-ku 3-9, Yokohama, Kanagawa 236-0004, Japan; Advanced Medical Research Center, Yokohama City University, Kanazawa-ku 3-9, Yokohama, Kanagawa 236-0004, Japan; Division of Gastroenterology, Hepatology & Nutrition, Developmental Biology, Center for Stem Cell and Organoid Medicine (CuSTOM), Cincinnati Children's Hospital Medical Center, 3333 Burnet Avenue, Cincinnati, OH 45229-3039, USA; Department of Pediatrics, University of Cincinnati College of Medicine, 3333 Burnet Avenue, Cincinnati, OH 45229-3039, USA.
| |
Collapse
|
30
|
Matsuzaki T, Ito H, Chevyreva V, Makky A, Kaufmann S, Okano K, Kobayashi N, Suganuma M, Nakabayashi S, Yoshikawa HY, Tanaka M. Adsorption of galloyl catechin aggregates significantly modulates membrane mechanics in the absence of biochemical cues. Phys Chem Chem Phys 2018; 19:19937-19947. [PMID: 28721420 DOI: 10.1039/c7cp02771k] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Physical interactions of four major green tea catechin derivatives with cell membrane models were systemically investigated. Catechins with the galloyl moiety caused the aggregation of small unilamellar vesicles and an increase in the surface pressure of lipid monolayers, while those without did not. Differential scanning calorimetry revealed that, in a low concentration regime (≤10 μM), catechin molecules are not significantly incorporated into the hydrophobic core of lipid membranes as substitutional impurities. Partition coefficient measurements revealed that the galloyl moiety of catechin and the cationic quaternary amine of lipids dominate the catechin-membrane interaction, which can be attributed to the combination of electrostatic and cation-π interactions. Finally, we shed light on the mechanical consequence of catechin-membrane interactions using the Fourier-transformation of the membrane fluctuation. Surprisingly, the incubation of cell-sized vesicles with 1 μM galloyl catechins, which is comparable to the level in human blood plasma after green tea consumption, significantly increased the bending stiffness of the membranes by a factor of more than 60, while those without the galloyl moiety had no detectable influence. Atomic force microscopy and circular dichroism spectroscopy suggest that the membrane stiffening is mainly attributed to the adsorption of galloyl catechin aggregates to the membrane surfaces. These results contribute to our understanding of the physical and thus the generic functions of green tea catechins in therapeutics, such as cancer prevention.
Collapse
Affiliation(s)
- Takahisa Matsuzaki
- Department of Chemistry, Saitama University, Sakura-ku, Saitama, 338-8570, Japan.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
31
|
Chen L, Teng H, Jia Z, Battino M, Miron A, Yu Z, Cao H, Xiao J. Intracellular signaling pathways of inflammation modulated by dietary flavonoids: The most recent evidence. Crit Rev Food Sci Nutr 2017; 58:2908-2924. [PMID: 28682647 DOI: 10.1080/10408398.2017.1345853] [Citation(s) in RCA: 121] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Lei Chen
- College of Food Science, Fujian Agriculture and Forestry University, Fuzhou, Fujian, China
| | - Hui Teng
- College of Food Science, Fujian Agriculture and Forestry University, Fuzhou, Fujian, China
| | - Zhen Jia
- College of Food Science, Fujian Agriculture and Forestry University, Fuzhou, Fujian, China
| | - Maurizio Battino
- Center for Nutrition & Health, Universidad Europea del Atlantico, Santander, Spain and Dept. of Clinical Sciences, Universitr Nutrition & Health, Universidad Europea
| | - Anca Miron
- Faculty of Pharmacy, Grigore T. Popa University of Medicine and Pharmacy Iasi, Romania
| | - Zhiling Yu
- Institute of Chinese Medical Sciences, State Key Laboratory of Quality Research in Chinese Medicine, University of Macau, Avenida da Universidade, Taipa, Macau
| | - Hui Cao
- College of Food Science, Fujian Agriculture and Forestry University, Fuzhou, Fujian, China
- Institute of Chinese Medical Sciences, State Key Laboratory of Quality Research in Chinese Medicine, University of Macau, Avenida da Universidade, Taipa, Macau
| | - Jianbo Xiao
- Institute of Chinese Medical Sciences, State Key Laboratory of Quality Research in Chinese Medicine, University of Macau, Avenida da Universidade, Taipa, Macau
| |
Collapse
|
32
|
Papuc C, Goran GV, Predescu CN, Nicorescu V, Stefan G. Plant Polyphenols as Antioxidant and Antibacterial Agents for Shelf-Life Extension of Meat and Meat Products: Classification, Structures, Sources, and Action Mechanisms. Compr Rev Food Sci Food Saf 2017; 16:1243-1268. [PMID: 33371586 DOI: 10.1111/1541-4337.12298] [Citation(s) in RCA: 269] [Impact Index Per Article: 38.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2017] [Revised: 08/04/2017] [Accepted: 08/04/2017] [Indexed: 12/27/2022]
Abstract
Oxidative processes and meat spoilage bacteria are major contributors to decreasing the shelf-life of meat and meat products. Oxidative processes occur during processing, storage, and light exposure, lowering the nutritional and sensory value and acceptability of meat and generating toxic compounds for humans. Polyphenols inhibit oxidative processes in 3 ways: as reactive species scavengers, lipoxygenase inhibitors, and reducing agents for metmyoglobin. Thus, polyphenols are candidate antioxidants for meat and meat products. The cross-contamination of meat with spoilage and pathogenic microorganisms can occur in production lines and result in economic losses. The ability of polyphenols to interact with bacterial cell wall components and the bacterial cell membrane can prevent and control biofilm formation, as well as inhibit microbial enzymes, interfere in protein regulation, and deprive bacterial cell enzymes of substrates and metal ions. Thus, polyphenols are candidate antimicrobial agents for use with meat and meat products. Commercially available polyphenols can decrease primary and secondary lipid peroxidation levels, inhibit lipoxygenase activity, improve meat color stability, minimize the degradation of salt-soluble myofibrillar protein and sulfhydryl groups, and retard bacterial growth. Further studies are now needed to clarify the synergistic/antagonistic action of various polyphenols, and to identify the best polyphenol classes, concentrations, and conditions of use.
Collapse
Affiliation(s)
- Camelia Papuc
- UASVM of Bucharest, Faculty of Veterinary Medicine, 105 Splaiul Independentei, 5th district, 050097, Bucharest, Romania
| | - Gheorghe V Goran
- UASVM of Bucharest, Faculty of Veterinary Medicine, 105 Splaiul Independentei, 5th district, 050097, Bucharest, Romania
| | - Corina N Predescu
- UASVM of Bucharest, Faculty of Veterinary Medicine, 105 Splaiul Independentei, 5th district, 050097, Bucharest, Romania
| | - Valentin Nicorescu
- UASVM of Bucharest, Faculty of Veterinary Medicine, 105 Splaiul Independentei, 5th district, 050097, Bucharest, Romania
| | - Georgeta Stefan
- UASVM of Bucharest, Faculty of Veterinary Medicine, 105 Splaiul Independentei, 5th district, 050097, Bucharest, Romania
| |
Collapse
|
33
|
Perumal S, Mahmud R, Ismail S. Mechanism of Action of Isolated Caffeic Acid and Epicatechin 3-gallate from Euphorbia hirta against Pseudomonas aeruginosa. Pharmacogn Mag 2017; 13:S311-S315. [PMID: 28808398 PMCID: PMC5538172 DOI: 10.4103/pm.pm_309_15] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2015] [Revised: 08/17/2015] [Indexed: 11/04/2022] Open
Abstract
BACKGROUND The escalating dominance of resistant Pseudomonas aeruginosa strains as infectious pathogen had urged the researchers to look for alternative and complementary drugs. OBJECTIVE The objective of this study is to address the biological targets and probable mechanisms of action underlying the potent antibacterial effect of the isolated compounds from Euphorbia hirta (L.) against P. aeruginosa. MATERIALS AND METHODS The action mechanisms of caffeic acid (CA) and epicatechin 3-gallate (ECG) on P. aeruginosa cells were investigated by several bacterial physiological manifestations involving outer membrane permeabilization, intracellular potassium ion efflux, and nucleotide leakage. RESULTS The findings revealed that ECG and CA targeted both cell wall and cytoplasmic membrane of P. aeruginosa. The cellular membrane destruction and ensuing membrane permeability perturbation of P. aeruginosa had led to the ascending access of hydrophobic antibiotics, release of potassium ions, and leakages of nucleotides. CONCLUSION The overall study concludes that ECG and CA isolated from E. hirta possess remarkable anti-infective potentials which can be exploited as drug template for the development of new antibacterial agent against resistant P. aeruginosa pathogen. SUMMARY Epicatechin 3-gallate (ECG) and caffeic acid (CA) exhibited remarkable bactericidal abilities by increasing the outer membrane and plasma membrane permeability of Pseudomonas aeruginosa pathogenECG and CA had facilitated the entry of hydrophobic antibiotics into P. aeruginosa by disintegrating the lipopolysaccharides layer of the outer membraneECG-induced potassium efflux with efficiency close to that obtained with cefepime suggesting mode of action through membrane disruptionBoth ECG and CA had caused consistent leakage of intracellular nucleotide content with the increase in time. Abbreviations used: ECG: Epicatechin 3-gallate; CA: Caffeic acid; E. hirta: Euphoria hirta.
Collapse
Affiliation(s)
- Shanmugapriya Perumal
- Pharmaceutical Chemistry, School of Pharmaceutical Sciences, Universiti Sains Malaysia, Malaysia
| | - Roziahanim Mahmud
- Pharmaceutical Chemistry, School of Pharmaceutical Sciences, Universiti Sains Malaysia, Malaysia
| | | |
Collapse
|
34
|
Sun Y, Sun TL, Huang HW. Mode of Action of Antimicrobial Peptides on E. coli Spheroplasts. Biophys J 2017; 111:132-9. [PMID: 27410741 DOI: 10.1016/j.bpj.2016.05.037] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2016] [Revised: 05/05/2016] [Accepted: 05/25/2016] [Indexed: 11/28/2022] Open
Abstract
We investigated the phenomena of antimicrobial peptides (AMPs) directly attacking the cytoplasmic membranes of Escherichia coli spheroplasts. We developed a procedure for fluorescence recovery after photobleaching to examine dye leakage through bacterial membranes as AMPs in solution bound to the membranes. We found that the AMP binding did not increase the apparent membrane area of a spheroplast, contrary to the response of a lipid-bilayer vesicle, which always showed a membrane area expansion by AMP binding. The permeability through the bacterial membrane increased in a sigmoidal fashion as the AMP binding increased in time, exhibiting a cooperative behavior of AMPs. The analysis of fluorescence recovery after photobleaching showed that the fluxes of dye molecules into and out of the cell were consistent with diffusion of molecules through a number of pores that increased with binding of AMPs and then saturated to a steady level. We discovered a new, to our knowledge, experimental parameter called the flux rate that characterizes the AMP-induced permeability of dye molecules through bacterial membranes. The phenomena observed in bacterial membranes are consistent with the pore-forming activities of AMPs previously observed in lipid bilayers. The experimental value of the flux rate per pore is much smaller than a theoretical value that assumes no friction for the dye molecule's permeation through the pore. We believe that experimental studies of the flux rate will be useful for further analysis of AMPs' permeabilization mechanisms.
Collapse
Affiliation(s)
- Yen Sun
- Department of Physics & Astronomy, Rice University, Houston, Texas
| | - Tzu-Lin Sun
- Department of Physics & Astronomy, Rice University, Houston, Texas
| | - Huey W Huang
- Department of Physics & Astronomy, Rice University, Houston, Texas.
| |
Collapse
|
35
|
Ye F, Yang C, Kim J, MacNevin CJ, Hahn KM, Park D, Ginsberg MH, Kim C. Epigallocatechin gallate has pleiotropic effects on transmembrane signaling by altering the embedding of transmembrane domains. J Biol Chem 2017; 292:9858-9864. [PMID: 28487468 DOI: 10.1074/jbc.c117.787309] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2017] [Revised: 05/01/2017] [Indexed: 11/06/2022] Open
Abstract
Epigallocatechin gallate (EGCG) is the principal bioactive ingredient in green tea and has been reported to have many health benefits. EGCG influences multiple signal transduction pathways related to human diseases, including redox, inflammation, cell cycle, and cell adhesion pathways. However, the molecular mechanisms of these varying effects are unclear, limiting further development and utilization of EGCG as a pharmaceutical compound. Here, we examined the effect of EGCG on two representative transmembrane signaling receptors, integrinαIIbβ3 and epidermal growth factor receptor (EGFR). We report that EGCG inhibits talin-induced integrin αIIbβ3 activation, but it activates αIIbβ3 in the absence of talin both in a purified system and in cells. This apparent paradox was explained by the fact that the activation state of αIIbβ3 is tightly regulated by the topology of β3 transmembrane domain (TMD); increases or decreases in TMD embedding can activate integrins. Talin increases the embedding of integrin β3 TMD, resulting in integrin activation, whereas we observed here that EGCG decreases the embedding, thus opposing talin-induced integrin activation. In the absence of talin, EGCG decreases the TMD embedding, which can also disrupt the integrin α-β TMD interaction, leading to integrin activation. EGCG exhibited similar paradoxical behavior in EGFR signaling. EGCG alters the topology of EGFR TMD and activates the receptor in the absence of EGF, but inhibits EGF-induced EGFR activation. Thus, this widely ingested polyphenol exhibits pleiotropic effects on transmembrane signaling by modifying the topology of TMDs.
Collapse
Affiliation(s)
- Feng Ye
- From the Department of Medicine, University of California San Diego School of Medicine, La Jolla, California 92093
| | - Chansik Yang
- the Department of Life Sciences, Korea University, Seoul 136-701, Republic of Korea.,the School of Biological Sciences, Seoul National University, Seoul 151-747, Republic of Korea, and
| | - Jiyoon Kim
- the Department of Life Sciences, Korea University, Seoul 136-701, Republic of Korea
| | - Christopher J MacNevin
- the Department of Pharmacology and Lineberger Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599
| | - Klaus M Hahn
- the Department of Pharmacology and Lineberger Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599
| | - Dongeun Park
- the School of Biological Sciences, Seoul National University, Seoul 151-747, Republic of Korea, and
| | - Mark H Ginsberg
- From the Department of Medicine, University of California San Diego School of Medicine, La Jolla, California 92093,
| | - Chungho Kim
- the Department of Life Sciences, Korea University, Seoul 136-701, Republic of Korea,
| |
Collapse
|
36
|
Faust JE, Yang PY, Huang HW. Action of Antimicrobial Peptides on Bacterial and Lipid Membranes: A Direct Comparison. Biophys J 2017; 112:1663-1672. [PMID: 28445757 PMCID: PMC5406281 DOI: 10.1016/j.bpj.2017.03.003] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2016] [Revised: 03/02/2017] [Accepted: 03/03/2017] [Indexed: 11/29/2022] Open
Abstract
The bacterial membrane represents an attractive target for the design of new antibiotics to combat widespread bacterial resistance. Understanding how antimicrobial peptides (AMPs) and other membrane-active agents attack membranes could facilitate the design of new, effective antimicrobials. Despite intense study of AMPs on model membranes, we do not know how well the mechanism of attack translates to real biological membranes. To that end, we have characterized the attack of AMPs on Escherichia coli cytoplasmic membranes and directly compared this action to model membranes. AMPs induce membrane permeability in E. coli spheroplasts or giant unilamellar vesicles (GUVs) under well-defined concentrations of AMPs and fluorescent molecules. The action of AMPs on spheroplasts is unique in producing an intracellular fluorescence intensity time curve that increases in a sigmoidal fashion to a steady state. This regular pattern is reproducible by melittin, LL37, and alamethicin but not by CCCP or daptomycin, agents known to cause ion leakage. Remarkably, a similar pattern was also reproduced in GUVs. Indeed the steady-state membrane permeability induced by AMPs is quantitatively the same in spheroplasts and GUVs. There are, however, interesting dissimilarities in details that reveal differences between bacterial and lipid membranes. Spheroplast membranes are permeabilized by a wide range of AMP concentrations to the same steady-state membrane permeability. In contrast, only a narrow range of AMP concentrations permeabilized GUVs to a steady state. Tension in GUVs also influences the action of AMPs, whereas the spheroplast membranes are tensionless. Despite these differences, our results provide a strong support for using model membranes to study the molecular interactions of AMPs with bacterial membranes. As far as we know, this is the first time the actions of AMPs, on bacterial membranes and on model membranes, have been directly and quantitatively compared.
Collapse
Affiliation(s)
- Joseph E Faust
- Department of Physics and Astronomy, Rice University, Houston, Texas
| | - Pei-Yin Yang
- Department of Physics and Astronomy, Rice University, Houston, Texas
| | - Huey W Huang
- Department of Physics and Astronomy, Rice University, Houston, Texas.
| |
Collapse
|
37
|
Montes de Oca MK, Pearlman RL, McClees SF, Strickland R, Afaq F. Phytochemicals for the Prevention of Photocarcinogenesis. Photochem Photobiol 2017; 93:956-974. [PMID: 28063168 DOI: 10.1111/php.12711] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2016] [Accepted: 11/03/2016] [Indexed: 12/13/2022]
Abstract
Ultraviolet (UV) exposure has an array of damaging effects and is the main cause of skin cancer in humans. Nonmelanoma skin cancer (NMSC), including basal cell carcinoma and squamous cell carcinoma, is the most common type of cancer. Incidence of NMSC has increased due to greater UV radiation, increased life expectancy and other changes in lifestyle; the annual cost of skin cancer treatment in the United States has increased concurrently to around eight billion dollars. Because of these trends, novel approaches to skin cancer prevention have become an important area of research to decrease skin cancer morbidity and defray the costs associated with treatment. Chemoprevention aims to prevent or delay the development of skin cancer through the use of phytochemicals. Use of phytochemicals as chemopreventive agents has gained attention due to their low toxicity and anticarcinogenic properties. Phytochemicals also exhibit antioxidant, anti-inflammatory and antiproliferative effects which support their use as chemopreventive agents, particularly for skin cancer. Preclinical and human studies have shown that phytochemicals decrease UV-induced skin damage and photocarcinogenesis. In this review article, we discuss the selected phytochemicals that may prevent or delay UV-induced carcinogenesis and highlight their potential use for skin protection.
Collapse
Affiliation(s)
| | - Ross L Pearlman
- Department of Dermatology, University of Alabama at Birmingham, Birmingham, AL
| | - Sarah F McClees
- Department of Dermatology, University of Alabama at Birmingham, Birmingham, AL
| | - Rebecca Strickland
- Department of Dermatology, University of Alabama at Birmingham, Birmingham, AL
| | - Farrukh Afaq
- Department of Dermatology, University of Alabama at Birmingham, Birmingham, AL.,Comprehensive Cancer Center, University of Alabama at Birmingham, Birmingham, AL
| |
Collapse
|
38
|
Li Y, Arranz E, Guri A, Corredig M. Mucus interactions with liposomes encapsulating bioactives: Interfacial tensiometry and cellular uptake on Caco-2 and cocultures of Caco-2/HT29-MTX. Food Res Int 2017; 92:128-137. [PMID: 28290290 DOI: 10.1016/j.foodres.2016.12.010] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2016] [Revised: 12/09/2016] [Accepted: 12/19/2016] [Indexed: 11/20/2022]
Abstract
Structuring of delivery matrices in foods aquires careful designing for optimal delivery and subsiquent absorption of the beneficial compounds in the gut. There has been quite improvement in mimicking digestion and absorption in vitro but as of yet little is understood on mucus interference in nutrient absorption Therefore in this study interactions of human intestinal mucus with milk and soy phospholipids liposomes carring hydrophilic (epigallocatechin-3-gallate) or hydrophobic (β-carotene) bioactive molecules were investigated. Liposomes of about 100nm were obtained using microfluidization and their behaviour with the human intestinal mucus were evaluated using drop shape tensiometry. The chemistry of the liposomes (milk or soy) and the encapsulated bioactive structure can affect the viscoelastic behaviour of the complex itself. Empty or loaded liposomes were differently interacting with the mucus at the interface. Mucus-liposomes interactions were also studied using cell cultures, Caco-2 (without mucus) and cocultures Caco-2/HT29-MTX (mucus producing). The interaction of mucus layer with liposomes was at some extent aligned with rheological studies. This work demonstrated that delivery systems may interact with the mucosal surface of intestinal cells, and in vitro approaches allow for screening of such interactions. These highlights could help us in carefully designing the delivery systems and moreover choosing the right carrier and/or bioactive that does not jeopardize the optimal delivery of the bioactive structure.
Collapse
Affiliation(s)
- Yang Li
- University of Guelph, Department of Food Science, Stone Rd 50, N1G 2W1 Guelph, ON, Canada
| | - Elena Arranz
- University of Guelph, Department of Food Science, Stone Rd 50, N1G 2W1 Guelph, ON, Canada
| | - Anilda Guri
- University of Guelph, Department of Food Science, Stone Rd 50, N1G 2W1 Guelph, ON, Canada.
| | - Milena Corredig
- University of Guelph, Department of Food Science, Stone Rd 50, N1G 2W1 Guelph, ON, Canada
| |
Collapse
|
39
|
Khadka NK, Teng P, Cai J, Pan J. Modulation of lipid membrane structural and mechanical properties by a peptidomimetic derived from reduced amide scaffold. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2017; 1859:734-744. [PMID: 28132901 DOI: 10.1016/j.bbamem.2017.01.026] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2016] [Revised: 01/22/2017] [Accepted: 01/25/2017] [Indexed: 10/20/2022]
Abstract
Understanding how antimicrobial peptidomimetics interact with lipid membranes is important in battling multidrug resistant bacterial pathogens. We study the effects of a recently reported peptidomimetic on lipid bilayer structural and mechanical properties. The compound referred to as E107-3 is synthesized based on the acylated reduced amide scaffold and has been shown to exhibit good antimicrobial potency. Our vesicle leakage assay indicates that the compound increases lipid bilayer permeability. We use micropipette aspiration to explore the kinetic response of giant unilamellar vesicles (GUVs). Exposure to the compound causes the GUV protrusion length LP to spontaneously increase and then decrease, followed by GUV rupture. Solution atomic force microscopy (AFM) is used to visualize lipid bilayer structural modulation within a nanoscopic regime. Unlike melittin, which produces pore-like structures, the peptidomimetic compound is found to induce nanoscopic heterogeneous structures. Finally, we use AFM-based force spectroscopy to study the impact of the compound on lipid bilayer mechanical properties. We find that incremental addition of the compound to planar lipid bilayers results in a moderate decrease of the bilayer puncture force FP and a 39% decrease of the bilayer area compressibility modulus KA. To explain our experimental data, we propose a membrane interaction model encompassing disruption of lipid chain packing and extraction of lipid molecules. The later action mode is supported by our observation of a double-bilayer structure in the presence of fusogenic calcium ions.
Collapse
Affiliation(s)
- Nawal K Khadka
- Department of Physics, University of South Florida, Tampa, FL 33620, United States
| | - Peng Teng
- Department of Chemistry, University of South Florida, Tampa, FL 33620, United States
| | - Jianfeng Cai
- Department of Chemistry, University of South Florida, Tampa, FL 33620, United States
| | - Jianjun Pan
- Department of Physics, University of South Florida, Tampa, FL 33620, United States.
| |
Collapse
|
40
|
Frias I, Neves AR, Pinheiro M, Reis S. Design, development, and characterization of lipid nanocarriers-based epigallocatechin gallate delivery system for preventive and therapeutic supplementation. DRUG DESIGN DEVELOPMENT AND THERAPY 2016; 10:3519-3528. [PMID: 27826184 PMCID: PMC5096752 DOI: 10.2147/dddt.s109589] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Green tea is manufactured from the leaves of Camellia sinensis and has been shown to possess, among other properties, anticancer, antiobesity, antiatherosclerotic, antidiabetic, antibacterial, and antiviral effects. The beneficial effects of green tea are related to the activities of (−)-epigallocatechin gallate (EGCG). This catechin is very unstable, undergoing degradation and epimerization, which is responsible for the loss of its health benefits. Encapsulation in nanoparticles (NPs) is an effective method to protect EGCG from adverse environmental conditions. In this work, solid lipid NPs (SLN) and nanostructured lipid carriers (NLC) were successfully developed to be used as biocompatible nanocarriers, enhancing the stability of EGCG. The mean diameter of the NPs was found to be around 300–400 nm, which is suitable for oral administration. Moreover, EGCG was effectively encapsulated with a remarkable efficiency of encapsulation of 80% and 90% for SLN and NLC, respectively. In addition, high storage stability of the formulations is expected as they maintain the initial characteristics for 3 months. Limited release of EGCG from the NPs was observed in simulated gastric and intestinal fluids. MTT and lactate dehydrogenase (LDH) assays demonstrated that NPs possess low toxicity, and so have potential to be used for preventive and therapeutic EGCG supplementation.
Collapse
Affiliation(s)
- Iúri Frias
- Research Unit on Applied Molecular Biosciences, Rede de Química e Tecnologia, Departamento de Ciências Químicas, Faculdade de Farmácia, Universidade do Porto, Porto, Portugal
| | - Ana Rute Neves
- Research Unit on Applied Molecular Biosciences, Rede de Química e Tecnologia, Departamento de Ciências Químicas, Faculdade de Farmácia, Universidade do Porto, Porto, Portugal
| | - Marina Pinheiro
- Research Unit on Applied Molecular Biosciences, Rede de Química e Tecnologia, Departamento de Ciências Químicas, Faculdade de Farmácia, Universidade do Porto, Porto, Portugal
| | - Salette Reis
- Research Unit on Applied Molecular Biosciences, Rede de Química e Tecnologia, Departamento de Ciências Químicas, Faculdade de Farmácia, Universidade do Porto, Porto, Portugal
| |
Collapse
|
41
|
Stenvang M, Dueholm MS, Vad BS, Seviour T, Zeng G, Geifman-Shochat S, Søndergaard MT, Christiansen G, Meyer RL, Kjelleberg S, Nielsen PH, Otzen DE. Epigallocatechin Gallate Remodels Overexpressed Functional Amyloids in Pseudomonas aeruginosa and Increases Biofilm Susceptibility to Antibiotic Treatment. J Biol Chem 2016; 291:26540-26553. [PMID: 27784787 DOI: 10.1074/jbc.m116.739953] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2016] [Revised: 10/07/2016] [Indexed: 01/09/2023] Open
Abstract
Epigallocatechin-3-gallate (EGCG) is the major polyphenol in green tea. It has antimicrobial properties and disrupts the ordered structure of amyloid fibrils involved in human disease. The antimicrobial effect of EGCG against the opportunistic pathogen Pseudomonas aeruginosa has been shown to involve disruption of quorum sensing (QS). Functional amyloid fibrils in P. aeruginosa (Fap) are able to bind and retain quorum-sensing molecules, suggesting that EGCG interferes with QS through structural remodeling of amyloid fibrils. Here we show that EGCG inhibits the ability of Fap to form fibrils; instead, EGCG stabilizes protein oligomers. Existing fibrils are remodeled by EGCG into non-amyloid aggregates. This fibril remodeling increases the binding of pyocyanin, demonstrating a mechanism by which EGCG can affect the QS function of functional amyloid. EGCG reduced the amyloid-specific fluorescent thioflavin T signal in P. aeruginosa biofilms at concentrations known to exert an antimicrobial effect. Nanoindentation studies showed that EGCG reduced the stiffness of biofilm containing Fap fibrils but not in biofilm with little Fap. In a combination treatment with EGCG and tobramycin, EGCG had a moderate effect on the minimum bactericidal eradication concentration against wild-type P. aeruginosa biofilms, whereas EGCG had a more pronounced effect when Fap was overexpressed. Our results provide a direct molecular explanation for the ability of EGCG to disrupt P. aeruginosa QS and modify its biofilm and strengthens the case for EGCG as a candidate in multidrug treatment of persistent biofilm infections.
Collapse
Affiliation(s)
- Marcel Stenvang
- From the Interdisciplinary Nanoscience Center (iNANO).,Department of Molecular Biology and Genetics, Center for Insoluble Protein Structures (inSPIN).,the Sino-Danish Centre for Education and Research (SDC), 8000 Aarhus C, Denmark
| | - Morten S Dueholm
- the Center for Microbial Communities, Department of Chemistry and Bioscience, Aalborg University, 9000 Aalborg, Denmark
| | - Brian S Vad
- From the Interdisciplinary Nanoscience Center (iNANO).,Department of Molecular Biology and Genetics, Center for Insoluble Protein Structures (inSPIN)
| | - Thomas Seviour
- the Singapore Centre on Environmental Life Sciences Engineering (SCELSE), Singapore 637551, Singapore
| | | | - Susana Geifman-Shochat
- the School of Biological Sciences, Nanyang Technological University, Singapore 637551, Singapore, and
| | - Mads T Søndergaard
- the Center for Microbial Communities, Department of Chemistry and Bioscience, Aalborg University, 9000 Aalborg, Denmark
| | | | - Rikke Louise Meyer
- From the Interdisciplinary Nanoscience Center (iNANO).,the Department of Bioscience, Aarhus University, 8000 Aarhus C, Denmark
| | - Staffan Kjelleberg
- the Singapore Centre on Environmental Life Sciences Engineering (SCELSE), Singapore 637551, Singapore.,the Centre for Marine Bio-innovation and School of Biotechnology and Biomolecular Science, University of New South Wales, Mosman, New South Wales 2088, Australia
| | - Per Halkjær Nielsen
- the Center for Microbial Communities, Department of Chemistry and Bioscience, Aalborg University, 9000 Aalborg, Denmark.,the Singapore Centre on Environmental Life Sciences Engineering (SCELSE), Singapore 637551, Singapore
| | - Daniel E Otzen
- From the Interdisciplinary Nanoscience Center (iNANO), .,Department of Molecular Biology and Genetics, Center for Insoluble Protein Structures (inSPIN)
| |
Collapse
|
42
|
de Athayde Moncorvo Collado A, Dupuy FG, Morero RD, Minahk C. Cholesterol induces surface localization of polyphenols in model membranes thus enhancing vesicle stability against lysozyme, but reduces protection of distant double bonds from reactive-oxygen species. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2016; 1858:1479-87. [DOI: 10.1016/j.bbamem.2016.04.002] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2015] [Revised: 04/01/2016] [Accepted: 04/05/2016] [Indexed: 12/24/2022]
|
43
|
Casado F, Teruel JA, Casado S, Ortiz A, Rodríguez-López JN, Aranda FJ. Location and Effects of an Antitumoral Catechin on the Structural Properties of Phosphatidylethanolamine Membranes. Molecules 2016; 21:molecules21070829. [PMID: 27347914 PMCID: PMC6274109 DOI: 10.3390/molecules21070829] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2016] [Revised: 06/21/2016] [Accepted: 06/22/2016] [Indexed: 01/15/2023] Open
Abstract
Green tea catechins exhibit high diversity of biological effects including antioncogenic properties, and there is enormous interest in their potential use in the treatment of a number of pathologies. It is recognized that the mechanism underlying the activity of catechins relay in part in processes related to the membrane, and many studies revealed that the ability of catechins to interact with lipids plays a probably necessary role in their mechanism of action. We present in this work the characterization of the interaction between an antitumoral synthetically modified catechin (3-O-(3,4,5-trimethoxybenzoyl)-(-)-catechin, TMCG) and dimiristoylphosphatidyl-ethanolamine (DMPE) membranes using an array of biophysical techniques which include differential scanning calorimetry, X-ray diffraction, infrared spectroscopy, atomic force microscopy, and molecular dynamics simulations. We found that TMCG incorporate into DMPE bilayers perturbing the thermotropic transition from the gel to the fluid state forming enriched domains which separated into different gel phases. TMCG does not influence the overall bilayer assembly of phosphatidylethanolamine systems but it manages to influence the interfacial region of the membrane and slightly decrease the interlamellar repeat distance of the bilayer. TMCG seems to be located in the interior of the phosphatidylethanolamine bilayer with the methoxy groups being in the deepest position and some portion of the molecule interacting with the water interface. We believe that the reported interactions are significant not only from the point of view of the known antitumoral effect of TMCG, but also might contribute to understanding the basic molecular mechanism of the biological effects of the catechins found at the membrane level.
Collapse
Affiliation(s)
- Francisco Casado
- Departamento de Bioquímica y Biología Molecular-A, Universidad de Murcia, Campus de Espinardo, Murcia E-30100, Spain.
| | - José A Teruel
- Departamento de Bioquímica y Biología Molecular-A, Universidad de Murcia, Campus de Espinardo, Murcia E-30100, Spain.
| | - Santiago Casado
- IMDEA-Nanoscience, Campus de Cantoblanco, Madrid E-28049, Spain.
| | - Antonio Ortiz
- Departamento de Bioquímica y Biología Molecular-A, Universidad de Murcia, Campus de Espinardo, Murcia E-30100, Spain.
| | - José N Rodríguez-López
- Departamento de Bioquímica y Biología Molecular-A, Universidad de Murcia, Campus de Espinardo, Murcia E-30100, Spain.
| | - Francisco J Aranda
- Departamento de Bioquímica y Biología Molecular-A, Universidad de Murcia, Campus de Espinardo, Murcia E-30100, Spain.
| |
Collapse
|
44
|
Myung Y, Yeom S, Han S. A niosomal bilayer of sorbitan monostearate in complex with flavones: a molecular dynamics simulation study. J Liposome Res 2016; 26:336-44. [DOI: 10.3109/08982104.2016.1144204] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Affiliation(s)
- Yoochan Myung
- Department of Biochemistry, Kangwon National University, Chunchon, Republic of Korea
| | - Seongyeol Yeom
- Department of Biochemistry, Kangwon National University, Chunchon, Republic of Korea
| | - Sanghwa Han
- Department of Biochemistry, Kangwon National University, Chunchon, Republic of Korea
| |
Collapse
|
45
|
Membrane-mediated amyloid formation of PrP 106-126: A kinetic study. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2015. [PMID: 26215743 DOI: 10.1016/j.bbamem.2015.07.014] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
PrP 106-126 conserves the pathogenic and physicochemical properties of the Scrapie isoform of the prion protein. PrP 106-126 and other amyloidal proteins are capable of inducing ion permeability through cell membranes, and this property may represent the common primary mechanism of pathogenesis in the amyloid-related degenerative diseases. However, for many amyloidal proteins, despite numerous phenomenological observations of their interactions with membranes, it has been difficult to determine the molecular mechanisms by which the proteins cause ion permeability. One approach that has not been undertaken is the kinetic study of protein-membrane interactions. We found that the reaction time constant of the interaction between PrP 106-126 and membranes is suitable for such studies. The kinetic experiment with giant lipid vesicles showed that the membrane area first increased by peptide binding but then decreased. The membrane area decrease was coincidental with appearance of extramembranous aggregates including lipid molecules. Sometimes, the membrane area would increase again followed by another decrease. The kinetic experiment with small vesicles was monitored by circular dichroism for peptide conformation changes. The results are consistent with a molecular simulation following a simple set of well-defined rules. We deduced that at the molecular level the formation of peptide amyloids incorporated lipid molecules as part of the aggregates. Most importantly the amyloid aggregates desorbed from the lipid bilayer, consistent with the macroscopic phenomena observed with giant vesicles. Thus we conclude that the main effect of membrane-mediated amyloid formation is extraction of lipid molecules from the membrane. We discuss the likelihood of this effect on membrane ion permeability.
Collapse
|
46
|
Sun Y, Sun TL, Huang HW. Physical properties of Escherichia coli spheroplast membranes. Biophys J 2015; 107:2082-90. [PMID: 25418093 DOI: 10.1016/j.bpj.2014.09.034] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2014] [Revised: 09/02/2014] [Accepted: 09/30/2014] [Indexed: 11/20/2022] Open
Abstract
We investigated the physical properties of bacterial cytoplasmic membranes by applying the method of micropipette aspiration to Escherichia coli spheroplasts. We found that the properties of spheroplast membranes are significantly different from that of laboratory-prepared lipid vesicles or that of previously investigated animal cells. The spheroplasts can adjust their internal osmolality by increasing their volumes more than three times upon osmotic downshift. Until the spheroplasts are swollen to their volume limit, their membranes are tensionless. At constant external osmolality, aspiration increases the surface area of the membrane and creates tension. What distinguishes spheroplast membranes from lipid bilayers is that the area change of a spheroplast membrane by tension is a relaxation process. No such time dependence is observed in lipid bilayers. The equilibrium tension-area relation is reversible. The apparent area stretching moduli are several times smaller than that of stretching a lipid bilayer. We conclude that spheroplasts maintain a minimum surface area without tension by a membrane reservoir that removes the excessive membranes from the minimum surface area. Volume expansion eventually exhausts the membrane reservoir; then the membrane behaves like a lipid bilayer with a comparable stretching modulus. Interestingly, the membranes cease to refold when spheroplasts lost viability, implying that the membrane reservoir is metabolically maintained.
Collapse
Affiliation(s)
- Yen Sun
- Department of Physics & Astronomy, Rice University, Houston, Texas
| | - Tzu-Lin Sun
- Department of Physics & Astronomy, Rice University, Houston, Texas
| | - Huey W Huang
- Department of Physics & Astronomy, Rice University, Houston, Texas.
| |
Collapse
|
47
|
Optical Microscopy of Giant Vesicles as a Tool to Reveal the Mechanism of Action of Antimicrobial Peptides and the Specific Case of Gomesin. ADVANCES IN PLANAR LIPID BILAYERS AND LIPOSOMES 2015. [DOI: 10.1016/bs.adplan.2014.12.001] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
|
48
|
Selvaraj S, Krishnaswamy S, Devashya V, Sethuraman S, Krishnan UM. Influence of membrane lipid composition on flavonoid-membrane interactions: Implications on their biological activity. Prog Lipid Res 2014; 58:1-13. [PMID: 25479162 DOI: 10.1016/j.plipres.2014.11.002] [Citation(s) in RCA: 76] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2014] [Revised: 10/29/2014] [Accepted: 11/24/2014] [Indexed: 01/22/2023]
Abstract
The membrane interactions and localization of flavonoids play a vital role in altering membrane-mediated cell signaling cascades as well as influence the pharmacological activities such as anti-tumour, anti-microbial and anti-oxidant properties of flavonoids. Various techniques have been used to investigate the membrane interaction of flavonoids. These include partition coefficient, fluorescence anisotropy, differential scanning calorimetry, NMR spectroscopy, electrophysiological methods and molecular dynamics simulations. Each technique will provide specific information about either alteration of membrane fluidity or localization of flavonoids within the lipid bilayer. Apart from the diverse techniques employed, the concentrations of flavonoids and lipid membrane composition employed in various studies reported in literature also are different and together these variables contribute to diverse findings that sometimes contradict each other. This review highlights different techniques employed to investigate the membrane interaction of flavonoids with special emphasis on erythrocyte model membrane systems and their significance in understanding the nature and extent of flavonoid-membrane interactions. We also attempt to correlate the membrane localization and alteration in membrane fluidity with the biological activities of flavonoids such as anti-oxidant, anti-cancer and anti-microbial properties.
Collapse
Affiliation(s)
- Stalin Selvaraj
- Centre for Nanotechnology & Advanced Biomaterials, School of Chemical & Biotechnology, SASTRA University, Thanjavur 613 401, India
| | - Sridharan Krishnaswamy
- Centre for Nanotechnology & Advanced Biomaterials, School of Chemical & Biotechnology, SASTRA University, Thanjavur 613 401, India
| | - Venkappayya Devashya
- Centre for Nanotechnology & Advanced Biomaterials, School of Chemical & Biotechnology, SASTRA University, Thanjavur 613 401, India
| | - Swaminathan Sethuraman
- Centre for Nanotechnology & Advanced Biomaterials, School of Chemical & Biotechnology, SASTRA University, Thanjavur 613 401, India
| | - Uma Maheswari Krishnan
- Centre for Nanotechnology & Advanced Biomaterials, School of Chemical & Biotechnology, SASTRA University, Thanjavur 613 401, India.
| |
Collapse
|
49
|
Coupland JN, Hayes JE. Physical approaches to masking bitter taste: lessons from food and pharmaceuticals. Pharm Res 2014; 31:2921-39. [PMID: 25205460 PMCID: PMC4898047 DOI: 10.1007/s11095-014-1480-6] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2014] [Accepted: 08/15/2014] [Indexed: 01/08/2023]
Abstract
Many drugs and desirable phytochemicals are bitter, and bitter tastes are aversive. Food and pharmaceutical manufacturers share a common need for bitterness-masking strategies that allow them to deliver useful quantities of the active compounds in an acceptable form and in this review we compare and contrast the challenges and approaches by researchers in both fields. We focus on physical approaches, i.e., micro- or nano-structures to bind bitter compounds in the mouth, yet break down to allow release after they are swallowed. In all of these methods, the assumption is the degree of bitterness suppression depends on the concentration of bitterant in the saliva and hence the proportion that is bound. Surprisingly, this hypothesis has only rarely been fully tested using a combination of adequate human sensory trials and measurements of binding. This is especially true in pharmaceutical systems, perhaps due to the greater experimental challenges in sensory analysis of drugs.
Collapse
Affiliation(s)
- John N Coupland
- Department of Food Science, The Pennsylvania State University, 337 Food Science Building, University Park, Pennsylvania, 16802, USA,
| | | |
Collapse
|
50
|
Bordenave N, Hamaker BR, Ferruzzi MG. Nature and consequences of non-covalent interactions between flavonoids and macronutrients in foods. Food Funct 2014; 5:18-34. [PMID: 24326533 DOI: 10.1039/c3fo60263j] [Citation(s) in RCA: 277] [Impact Index Per Article: 27.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Many of the potential health benefits of flavonoids have been associated with their specific chemical and biological properties including their ability to interact and bind non-covalently to macronutrients in foods. While flavonoid-protein interactions and binding have been the subject of intensive study, significantly less is understood about non-covalent interactions with carbohydrates and lipids. These interactions with macronutrients are likely to impact both the flavonoid properties in foods, such as their radical scavenging activity, and the food or beverage matrix itself, including their taste, texture and other sensorial properties. Overall, non-covalent binding of flavonoids with macronutrients is primarily driven by van der Waals interactions. From the flavonoid perspective, these interactions are modulated by characteristics such as degree of polymerization, molecular flexibility, number of external hydroxyl groups, or number of terminal galloyl groups. From the macronutrient standpoint, electrostatic and ionic interactions are generally predominant with carbohydrates, while hydrophobic interactions are generally predominant with lipids and mainly limited to interactions with flavonols. All of these interactions are involved in flavonoid-protein interactions. While primarily associated with undesirable characteristics in foods and beverages, such as astringency, negative impact on macronutrient digestibility and hazing, more recent efforts have attempted to leverage these interactions to develop controlled delivery systems or strategies to enhance flavonoids bioavailability. This paper aims at reviewing the fundamental bases for non-covalent interactions, their occurrence in food and beverage systems and their impact on the physico-chemical, organoleptic and some nutritional properties of food.
Collapse
|