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Beckman CKDC, de Lima Costa T, Puppin-Rontani RM, de Castilho ARF. Exploring the role of flavonoids in caries-affected dentin adhesion: A comprehensive scoping review. Arch Oral Biol 2024; 162:105942. [PMID: 38452415 DOI: 10.1016/j.archoralbio.2024.105942] [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: 12/04/2023] [Revised: 01/31/2024] [Accepted: 02/26/2024] [Indexed: 03/09/2024]
Abstract
OBJECTIVES The aim of this scoping review was to evaluate the available scientific evidence regarding the use of flavonoids in the treatment of caries-affected dentin focusing on bonding to dentin. METHODS A comprehensive literature search was performed in five databases from March 2022 and updated in April 2023: PubMed, EMBASE, Scopus, Web of Science, and Scielo. Additionally, the references of included studies were manually searched. Gray literature was excluded from the review. STUDY SELECTION Inclusion criteria included in vitro, in situ, and in vivo studies (animal or human) published in English. Abstracts, reviews, case reports, book chapters, doctoral dissertations, guidelines, and studies using pure plant extracts were excluded. Data collected from the selected studies were summarized and subjected to narrative and descriptive analysis. Out of the 91 studies identified, only 16 studies met the inclusion criteria. RESULTS The review analyzed eight different flavonoids (hesperidin, galardin, proanthocyanidin, genipin, quercetin, naringin, epigallocatechin-3-gallate, and other catechins subtypes) used as pretreatment or loaded into adhesive systems, primers, and phosphoric acid. The use of flavonoids improved the mechanical properties of the materials and modified the biological properties of the dentin, reducing collagen loss by the inhibition of proteolytic activity of matrix metalloproteinases (MMPs). CONCLUSIONS Based on the findings of this scoping review, it can be concluded that the use of flavonoids as pretreatment or incorporation into dental materials preserves collagen in the hybrid layer, inhibiting the MMPs activities, modifying the collagen fibrils of the dentin matrix and improving the mechanical properties of the dental adhesive systems. Therefore, it represents a promising approach for promoting dentin biomodification. This can result in more stable bonding of adhesive restorations to caries-affected dentin.
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Affiliation(s)
- Camilla Karoline de Carvalho Beckman
- Departamento de Ciências da Saúde e Odontologia Infantil, Área de Odontopediatria, Faculdade de Odontologia de Piracicaba (FOP) - Universidade Estadual de Campinas (UNICAMP), Piracicaba, SP, Brazil
| | - Tainá de Lima Costa
- Departamento de Ciências da Saúde e Odontologia Infantil, Área de Odontologia Preventiva eSaúde Pública, Faculdade de Odontologia de Piracicaba (FOP) - Universidade Estadual de Campinas (UNICAMP), Piracicaba, SP, Brazil
| | - Regina Maria Puppin-Rontani
- Departamento de Ciências da Saúde e Odontologia Infantil, Área de Odontopediatria, Faculdade de Odontologia de Piracicaba (FOP) - Universidade Estadual de Campinas (UNICAMP), Piracicaba, SP, Brazil; Departamento de Odontologia Restauradora, Área de Materiais Dentários, Faculdade de Odontologia de Piracicaba (FOP) - Universidade Estadual de Campinas (UNICAMP), Piracicaba, SP, Brazil
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Benouchenne D, Bellil I, Bendjedid S, Ramos A, Nieto G, Akkal S, Khelifi D. The First Records of the In Silico Antiviral and Antibacterial Actions of Molecules Detected in Extracts of Algerian Fir ( Abies numidica De Lannoy) Using LC-MS/MS Analysis. PLANTS (BASEL, SWITZERLAND) 2024; 13:1246. [PMID: 38732461 PMCID: PMC11085235 DOI: 10.3390/plants13091246] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2024] [Revised: 04/24/2024] [Accepted: 04/25/2024] [Indexed: 05/13/2024]
Abstract
(1) Background: Due to the wide application in medicinal and pharmaceutical chemistry of flavonoid molecules, which are one of the most famous types of secondary plant metabolites, our work has come within the framework of bio-consulting to help in the identification of the molecule(s) responsible for the antibacterial effect which will be the active principle of a natural antibiotic developed from Algerian fir using bioinformatics tools. (2) Methods: The docking method was used to test the antiviral activity on SARS-CoV-2 virus and the antibacterial activity on Gram-positive Staphylococcus aureus and Gram-negative Escherichia coli of 12 polyphenolic molecules present in the ethyl acetate and n-butanol extracts of Numidian fir leaves, and identify the molecules responsible for these specific biological activities. (3) Results: The findings revealed that it is possible that two molecules, hyperoside and quercitrin, have a high capacity to inhibit SARS-CoV-2, and it is important to mention that they are the most quantitatively abundant molecules in the extract. The molecule luteolin-7-glucoside is probably responsible for the antibacterial activity in the extract against Gram-negative bacteria such as Escherichia coli, and the molecule hesperidin is responsible for the antibacterial activity in the extract against Gram-positive bacteria such as Staphylococcus aureus.
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Affiliation(s)
- Djamila Benouchenne
- Laboratoire de Génétique Biochimie et Biotechnologies Végétales, Faculté des Sciences de la Nature et de la Vie, Université Frères Mentouri Constantine 1, Constantine 25000, Algeria; (D.B.); (I.B.); (D.K.)
- Higher National School of Biotechnology, Taoufik KHAZNADAR, Nouveau Pôle Universitaire Ali Mendjili, BP. E66, Constantine 25100, Algeria
| | - Ines Bellil
- Laboratoire de Génétique Biochimie et Biotechnologies Végétales, Faculté des Sciences de la Nature et de la Vie, Université Frères Mentouri Constantine 1, Constantine 25000, Algeria; (D.B.); (I.B.); (D.K.)
| | - Samira Bendjedid
- Research Laboratory of Functional and Evolutionary Ecology, Department of Biology, Faculty of Natural Sciences and Life, Chadli Bendjedid University, El Tarf 36000, Algeria;
| | - Ana Ramos
- Neuroscience and Aging Research Group, Faculty of Health Sciences, Corporación Universitaria Remington, Calle 51 n°51-27, Medellin 050012, Colombia
| | - Gema Nieto
- Department of Food Technology, Food Science and Nutrition, Faculty of Veterinary Sciences, Regional Campus of International Excellence “Campus Mare Nostrum”, University of Murcia, Espinardo, 30071 Murcia, Spain
| | - Salah Akkal
- Laboratory of Phytochemistry, Natural Products and Organic Synthesis (Physynor), Department of Chemistry, Faculty of Exact Sciences, University Brother Mentouri Constantine 1, Constantine 25000, Algeria;
| | - Douadi Khelifi
- Laboratoire de Génétique Biochimie et Biotechnologies Végétales, Faculté des Sciences de la Nature et de la Vie, Université Frères Mentouri Constantine 1, Constantine 25000, Algeria; (D.B.); (I.B.); (D.K.)
- Higher National School of Biotechnology, Taoufik KHAZNADAR, Nouveau Pôle Universitaire Ali Mendjili, BP. E66, Constantine 25100, Algeria
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3
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Du G, Wang X, Zhao Q. Targeted Removal of Galloylated Flavanols to Adjust Wine Astringency by Using Molecular Imprinting Technology. Foods 2023; 12:3331. [PMID: 37761040 PMCID: PMC10530250 DOI: 10.3390/foods12183331] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2023] [Revised: 08/10/2023] [Accepted: 08/22/2023] [Indexed: 09/29/2023] Open
Abstract
Excessive galloylated flavanols not only cause instability in the wine but also lead to unbalanced astringency. Although clarification agents are always used to precipitate unstable tannins in wine, the non-specific adsorption of tannins results in the failure to precisely regulate the tannin composition of the wine. In this work, molecularly imprinted polymers (MIPs) with template molecules of galloylated flavanols were designed to specifically adsorb gallotannins to reduce wine astringency. The results showed that the "pores" on the surface of the MIPs are the structural basis for the specific adsorption of the target substances, and the adsorption process is a chemically driven single-molecule layer adsorption. Moreover, in the mono/oligomeric gallotannin-rich model solution, the adsorption of gallotannins by I-MIPs prepared as single template molecules reached 71.0%, and the adsorption capacity of MIPs for monomeric gallotannins was about 6.0 times higher than polymeric gallotannins. Given the lack of technology for the targeted adsorption of tannins from wine, this work explored the targeted modulation of wine astringency by using molecular imprinting techniques.
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Affiliation(s)
- Guorong Du
- School of Biological and Environmental Engineering, Xi’an University, Xi’an 710065, China;
| | - Xiaoyu Wang
- College of Food Engineering and Nutritional Science, Shaanxi Normal University, 620 West Chang’an Avenue, Xi’an 710119, China
- Engineering Research Center for High-Valued Utilization of Fruit Resources in Western China, Ministry of Education, Xi’an 710119, China
| | - Qinghao Zhao
- College of Food Engineering and Nutritional Science, Shaanxi Normal University, 620 West Chang’an Avenue, Xi’an 710119, China
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Maaroufi I, Jamsransuren D, Hashida K, Matsuda S, Ogawa H, Takeda Y. An Abies Extract Containing Nonvolatile Polyphenols Shows Virucidal Activity against SARS-CoV-2 That Is Enhanced in Increased pH Conditions. Pathogens 2023; 12:1093. [PMID: 37764901 PMCID: PMC10534523 DOI: 10.3390/pathogens12091093] [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: 06/10/2023] [Revised: 08/21/2023] [Accepted: 08/24/2023] [Indexed: 09/29/2023] Open
Abstract
Researching the beneficial health properties of wood byproducts can prevent wastage by turning them into valuable resources. In this study, the virucidal activity of two extracts from Abies sachalinensis byproducts, ASE1, and ASE2, against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) was investigated. ASE1 is rich in monoterpenoid volatile compounds, whereas ASE2 contains nonvolatile polyphenols. SARS-CoV-2 solutions were mixed with ASE1 or ASE2, and viral titer reduction was evaluated. At their original acidic pH, ASE2 showed stronger virucidal activity than ASE1. The virucidal activity of ASE2 was also significantly enhanced when pH was increased to neutral or basic, which was not the case for ASE1. At a neutral pH, ASE2 induced statistically significant viral titer reduction in 1 min. HCl and NaOH solutions, which had a pH close to that of acidic and basic ASE2 test mixtures, respectively, exhibited no virucidal activity against SARS-CoV-2. Among the SARS-CoV-2 variants, Omicron showed the highest vulnerability to ASE2. Western blotting, RT-PCR, and electron microscopic analysis revealed that neutral ASE2 interacts with SARS-CoV-2 spike proteins and moderately disrupts the SARS-CoV-2 genome and viral envelope. These findings reveal the virucidal potential of ASE2.
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Affiliation(s)
- Imane Maaroufi
- Graduate School of Animal and Veterinary Sciences and Agriculture, Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080-8555, Japan;
| | - Dulamjav Jamsransuren
- Research Center for Global Agromedicine, Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080-8555, Japan; (D.J.); (S.M.)
| | - Koh Hashida
- Department of Forest Resources Chemistry, Forestry and Forest Products Research Institute, Tsukuba 305-8687, Japan;
| | - Sachiko Matsuda
- Research Center for Global Agromedicine, Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080-8555, Japan; (D.J.); (S.M.)
| | - Haruko Ogawa
- Department of Veterinary Medicine, Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080-8555, Japan;
| | - Yohei Takeda
- Research Center for Global Agromedicine, Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080-8555, Japan; (D.J.); (S.M.)
- Department of Veterinary Medicine, Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080-8555, Japan;
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Kuriya K, Goto S, Kobayashi E, Nishio M, Nakamura M, Umekawa H. Cholesterol-lowering activity of adzuki bean (Vigna angularis) polyphenols. Mol Biol Rep 2023:10.1007/s11033-023-08481-7. [PMID: 37160631 DOI: 10.1007/s11033-023-08481-7] [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: 09/13/2022] [Accepted: 04/21/2023] [Indexed: 05/11/2023]
Abstract
BACKGROUND Adzuki beans (ABs; Vigna angularis) were reported to show potential for prevention of cholesterol absorption and lowering of the blood cholesterol level. However, the main active compounds and some cellular effects remain unknown. In this study, we evaluated the potential cholesterol-lowering effects of (+)-catechin 7-O-β-D-glucopyranoside (C7G) and (+)-epicatechin 7-O-β-D-glucopyranoside (E7G), identified as abundant polyphenols in ABs. METHODS AND RESULTS To investigate the cholesterol-lowering activity in vitro, cholesterol micelles, bile acids, and Caco-2 cells as an intestinal model were used in the study. C7G and E7G each inhibited micellar solubility in a dose-dependent manner, and their inhibitory activity was as strong as that of (+)-catechin (IC50 values: C7G, 0.23 ± 0.03 mg/ml; E7G, 0.22 ± 0.02 mg/ml; (+)-catechin, 0.26 ± 0.11 mg/ml). The AB polyphenols showed binding activity toward bile acids and changed them into an insoluble form. When Caco-2 cells were treated with C7G or E7G, the amount of incorporated cholesterol was significantly decreased compared with vehicle-treated control cells, and no cytotoxicity was observed under the experimental conditions used. Meanwhile, quantitative real-time PCR revealed that the mRNA level of the cholesterol transporter NPC1L1 remained unchanged in the treated cells. CONCLUSIONS Taken together, the present findings suggest that C7G and E7G are the main active compounds in ABs, and have the ability to inhibit micellar solubility, bind to bile acids, and suppress cholesterol absorption. The present study supports the health benefits of ABs as a medicinal food and the application of AB polyphenols as medicinal supplements to suppress cholesterol elevation.
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Affiliation(s)
- Kenji Kuriya
- Department of Life Sciences, Graduate School of Bioresources, Mie University, 1577 Kurimamachiya, Tsu, Mie, 514-8507, Japan.
| | - Sayaka Goto
- Department of Life Sciences, Graduate School of Bioresources, Mie University, 1577 Kurimamachiya, Tsu, Mie, 514-8507, Japan
| | - Erina Kobayashi
- Department of Life Sciences, Graduate School of Bioresources, Mie University, 1577 Kurimamachiya, Tsu, Mie, 514-8507, Japan
| | - Masahiro Nishio
- Department of Life Sciences, Graduate School of Bioresources, Mie University, 1577 Kurimamachiya, Tsu, Mie, 514-8507, Japan
| | | | - Hayato Umekawa
- Department of Life Sciences, Graduate School of Bioresources, Mie University, 1577 Kurimamachiya, Tsu, Mie, 514-8507, Japan
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Ge G, Zhao J, Zheng J, Zhou X, Zhao M, Sun W. Green tea polyphenols bind to soy proteins and decrease the activity of soybean trypsin inhibitors (STIs) in heated soymilk. Food Funct 2022; 13:6726-6736. [PMID: 35661183 DOI: 10.1039/d2fo00316c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The interaction between epigallocatechin gallate (EGCG) and soy proteins at room temperature (25 °C) and after heating at 100 and 121 °C, and their effects on the inactivation of soybean trypsin inhibitors (STIs) in soymilk were investigated. The results of the nitroblue tetrazolium (NBT) staining assay showed that soy proteins can covalently bind to EGCG. The α/α' and A subunits in heated soymilk preferred to bind to EGCG because of their soluble state. More thiols were trapped when EGCG was added before thermal processing, and the free amino groups were depleted more with EGCG addition after heating. Circular dichroism and fluorescence spectroscopy showed that EGCG addition before or after heating induced different secondary and tertiary structural changes for soy proteins. The exposed aromatic amino acids preferred to react with EGCG before protein aggregation in the heating process. The random coil of soymilk proteins increased more when EGCG was added in soymilk after heating, resulting in more disordered structures in protein conformation. The binding between EGCG and soy proteins promoted protein aggregation, which was confirmed by the particle size distribution and gel electrophoresis. The trypsin and chymotrypsin inhibitory activity (TIA and CIA) in soymilk significantly reduced to 693 U mL-1 and 613 U mL-1, respectively, under the conditions of 2 mM EGCG addition after 100 °C heating for 10 min (p < 0.05). Consequently, the influence of EGCG on STI inactivation in soymilk only worked when EGCG was added after heating.
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Affiliation(s)
- Ge Ge
- School of Food Science and Engineering, South China University of Technology, Guangzhou, 510641, China.
| | - Jinsong Zhao
- School of Food Science and Engineering, South China University of Technology, Guangzhou, 510641, China.
| | - Jiabao Zheng
- School of Food Science and Engineering, South China University of Technology, Guangzhou, 510641, China.
| | - Xuesong Zhou
- Guangzhou Honsea Industry Co., Ltd, Guangzhou, 510530, China
| | - Mouming Zhao
- School of Food Science and Engineering, South China University of Technology, Guangzhou, 510641, China.
- Overseas Expertise Introduction Center for Discipline Innovation of Food Nutrition and Human Health (111 Center), Guangzhou 510641, China
| | - Weizheng Sun
- School of Food Science and Engineering, South China University of Technology, Guangzhou, 510641, China.
- Overseas Expertise Introduction Center for Discipline Innovation of Food Nutrition and Human Health (111 Center), Guangzhou 510641, China
- National Technology Innovation Center of Synthetic Biology, Tianjin 300308, China
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Hu M, Du X, Liu G, Huang Y, Qi B, Li Y. Sodium alginate/soybean protein-epigallocatechin-3-gallate conjugate hydrogel beads: evaluation of structural, physical, and functional properties. Food Funct 2021; 12:12347-12361. [PMID: 34842261 DOI: 10.1039/d1fo03099j] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Sodium alginate (SA) hydrogel beads have been extensively studied as delivery systems for bioactive compounds. Key challenges include overcoming the highly porous and poor emulsifying properties of SA hydrogels. Herein, soy protein isolate (SPI) was modified by covalent and noncovalent conjugation with epigallocatechin-3-gallate (EGCG), followed by complexation with SA to change the SA structure and fabricate hydrogel beads with low porosities. Microencapsulation beads were fabricated from SA-, SA/SPI-, and SA/SPI-modified EGCG complexes with a corn oil/quercetin mixture core. After the covalent and noncovalent SPI-modified EGCG complexes were combined with SA, the OH stretching vibration shifted, indicating that hydrogen bonds formed between the protein and SA, and the crystal structure of SA was destroyed. To achieve crosslinking, the beads were injected into a CaCl2 solution, whereby Ca2+ ions replaced the Na+ ions in SA. Meanwhile, the addition of covalent and noncovalent SPI-modified EGCG complexes promoted the binding capacity of Ca2+ and SA. All hydrogel beads possessed open-cell microstructures with interconnecting pores. The SA/SPI-modified EGCG hydrogel beads exhibited smoother surfaces, thicker shells, and lower porosity than the SA hydrogel beads. Moreover, they exhibited significantly higher antioxidant activities. During digestion, all types of hydrogel bead maintained their structure, and only a small part of the encapsulated oil and quercetin was digested in the upper part of the gastrointestinal tract. In short, the formation mechanism of hydrogel beads was clarified, and hydrogel beads with low porosity and high antioxidation activities were successfully fabricated.
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Affiliation(s)
- Miao Hu
- College of Food Science, Northeast Agricultural University, Harbin, Heilongjiang 150030, China.
| | - Xiaoqian Du
- College of Food Science, Northeast Agricultural University, Harbin, Heilongjiang 150030, China.
| | - Guannan Liu
- College of Food Science, Northeast Agricultural University, Harbin, Heilongjiang 150030, China.
| | - Yuyang Huang
- National Research Center of Soybean Engineering and Technology, Harbin, Heilongjiang 150030, China.,College of Food Engineering, Harbin University of Commerce, Harbin, Heilongjiang, 150027, China
| | - Baokun Qi
- College of Food Science, Northeast Agricultural University, Harbin, Heilongjiang 150030, China. .,National Research Center of Soybean Engineering and Technology, Harbin, Heilongjiang 150030, China
| | - Yang Li
- College of Food Science, Northeast Agricultural University, Harbin, Heilongjiang 150030, China. .,National Research Center of Soybean Engineering and Technology, Harbin, Heilongjiang 150030, China.,Heilongjiang Green Food Science Research Institute, Harbin 150028, China
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Ge G, Zhao J, Zheng J, Zhao M, Sun W. Pepsin Diffusivity and In Vitro Gastric Digestion of Soymilk as Affected by Binding of Tea Polyphenols to Soy Proteins. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2021; 69:11043-11052. [PMID: 34499500 DOI: 10.1021/acs.jafc.1c04705] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
This study aimed to investigate the effect of tea polyphenol extract (TPE) on the in vitro gastric digestion of soymilk. Fluorescence recovery after photobleaching was applied to measure pepsin diffusivity in soymilk. The characteristics of soymilk digesta were evaluated by gel electrophoresis, degree of hydrolysis (DH), molecular weight distribution, free amino acid analysis, particle size, antioxidant capacity, and trypsin/chymotrypsin inhibitor activity (TIA/CIA). The binding between soy proteins and tea polyphenols could significantly impair in vitro gastric digestion of soymilk by decreasing pepsin diffusivity from 91.3 to 70.3 μm2/s and DH from 17.13 to 13.93% with 1.2 mg/g TPE addition. Soymilk with 0.6 mg/g TPE addition exhibited low TIA/CIA and a strong antioxidant capacity in gastric digesta, which might be good for the following intestinal digestion. A better understanding of the effect of polyphenol on the digestion of protein-based food may be beneficial to innovation in food manufacturing.
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Affiliation(s)
- Ge Ge
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510641, China
| | - Jie Zhao
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510641, China
| | - Jiabao Zheng
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510641, China
| | - Mouming Zhao
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510641, China
- Overseas Expertise Introduction Center for Discipline Innovation of Food Nutrition and Human Health (111 Center), Guangzhou 510641, China
| | - Weizheng Sun
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510641, China
- Overseas Expertise Introduction Center for Discipline Innovation of Food Nutrition and Human Health (111 Center), Guangzhou 510641, China
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Walnut pellicle phenolics greatly influence the extraction and structural properties of walnut protein isolates. Food Res Int 2021; 141:110163. [PMID: 33642023 DOI: 10.1016/j.foodres.2021.110163] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2020] [Revised: 12/28/2020] [Accepted: 01/13/2021] [Indexed: 11/23/2022]
Abstract
This study investigated the effects of walnut phenolics and extraction methods on the composition and structural properties of walnut protein isolates (WPIs). Fluorescence quenching experiments showed that walnut phenolics could bind to walnut globulins, albumins, and glutelins with apparent affinity constants of 5.49 × 104 M-1, 1.71 × 104 M-1, and 3.10 × 104 M-1, respectively. However, the UV turbidity and dynamic light scattering (DLS) measurements indicated that phenolics could lead to the severe precipitation of globulins and albumins but not glutelins. The removal of pellicles could significantly increase the yield rate of salt-soluble globulins to approximately 72.8%. Furthermore, salt- and alkaline-extraction methods could produce comparable WPIs yields when using pellicle-free walnut kernels. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) and size-exclusive chromatography indicated that the major protein compositions of the salt- and alkaline-extracted WPIs from pellicle-free walnut kernels were similar, while alkaline-extracted WPIs from kernels with pellicles exhibited phenolic-induced protein aggregation. Fourier transform infrared (FTIR) spectroscopy indicated that WPIs produced from kernels with pellicles contained more α-helix and less β-sheet structures than WPIs produced from pellicle-free kernels. These results confirm that walnut pellicle phenolics and the extraction methods could greatly influence the composition and structural properties of WPIs.
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Indurkar A, Pandit A, Jain R, Dandekar P. Plant based cross-linkers for tissue engineering applications. J Biomater Appl 2020; 36:76-94. [PMID: 33342347 DOI: 10.1177/0885328220979273] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Utility of plant-based materials in tissue engineering has exponentially increased over the years. Recent efforts in this area have been focused on substituting synthetic cross-linkers with natural ones derived from biological sources. These cross-linkers are essentially derived from the vegetative components of plants therefore suitably categorised as 'green' and renewable materials. Utilization of plant based cross-linkers in scaffolds and hydrogels offers several advantages compared to the synthetic ones. Natural compounds, like ferulic acid and genipin, when incorporated into scaffolds can promote cellular proliferation and growth, by regulation of growth factors. They participate in crucial activities, thus providing impetus for cell growth, function, differentiation and angiogenesis. Several natural compounds inherently possess anti-microbial, antioxidant and anti-inflammatory effects, which enhance the inherent characteristics of the scaffolds. Versatility of natural cross-linkers can be exploited for diverse applications. Integrating such potent molecules can enable the scaffold to display relevant characteristics for each function. This review article focuses on the recent developments with plant based cross-linkers that are employed for scaffold synthesis and their applications, which may be explored to synthesize scaffolds suitable for diverse biomedical applications.
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Affiliation(s)
- Abhishek Indurkar
- Department of Pharmaceutical Sciences and Technology, Institute of Chemical Technology, Mumbai, India
| | - Ashish Pandit
- Department of Chemical Engineering, Institute of Chemical Technology, Mumbai, India
| | - Ratnesh Jain
- Department of Chemical Engineering, Institute of Chemical Technology, Mumbai, India
| | - Prajakta Dandekar
- Department of Pharmaceutical Sciences and Technology, Institute of Chemical Technology, Mumbai, India
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11
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Poojary MM, Zhang W, Olesen SB, Rauh V, Lund MN. Green Tea Extract Decreases Arg-Derived Advanced Glycation Endproducts but Not Lys-Derived AGEs in UHT Milk during 1-Year Storage. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2020; 68:14261-14273. [PMID: 33201715 DOI: 10.1021/acs.jafc.0c05995] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Epigallocatechin gallate (EGCG)-enriched green tea extract (GTE) was added to lactose-reduced UHT-treated milk to evaluate its role in perturbing the Maillard reaction and the formation of advanced glycation endproducts (AGEs) during 1-year storage. The UHT processing caused epimerization of EGCG into gallocatechin gallate (GCG). For milk samples with added 0.1% w/v GTE, a EGCG/GCG loss of 26% was found soon after the UHT treatment and the loss increased to 64% after the 1-year of storage. LC-MS/MS analysis revealed the presence of various EGCG/GCG-α-dicarbonyl adducts and EGCG/GCG-hydroxymethylfurfural adducts in milk samples, while EGCG/GCG-amino acid adducts were not detected. Although EGCG/GCG trapped α-dicarbonyl compounds including glyoxal, methylglyoxal, 3-deoxyglucosone/3-deoxygalactosone, and diacetyl, it did not lower their net steady-state concentrations, except of 3-deoxyglucosone. The addition of GTE reduced the formation of Arg-derived AGEs by 2- to 3-fold, but surprisingly enhanced the accumulation of furosine and lysine-derived AGEs [Nε-(carboxymethyl)lysine and Nε-(carboxyethyl)lysine)] by 2-4-fold depending on the concentration of the added GTE and storage time. The present study shows that trapping of α-dicarbonyl compounds by EGCG may not be the major pathway for inhibiting the formation of AGEs in milk.
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Affiliation(s)
- Mahesha M Poojary
- Department of Food Science, University of Copenhagen, Rolighedsvej 26, 1958 Frederiksberg C, Denmark
| | - Wei Zhang
- Department of Food Science, University of Copenhagen, Rolighedsvej 26, 1958 Frederiksberg C, Denmark
| | - Sarah Bisgaard Olesen
- Department of Forensic Medicine, Aarhus University, Palle Juul-Jensens Boulevard 99, 8200 Aarhus N, Denmark
| | - Valentin Rauh
- Arla Foods Innovation Center, Agro Food Park 19, 8200 Aarhus N, Denmark
| | - Marianne N Lund
- Department of Food Science, University of Copenhagen, Rolighedsvej 26, 1958 Frederiksberg C, Denmark
- Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Blegdamsvej 3, 2200 Copenhagen N, Denmark
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12
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The tea catechin epigallocatechin gallate inhibits NF-κB-mediated transcriptional activation by covalent modification. Arch Biochem Biophys 2020; 695:108620. [DOI: 10.1016/j.abb.2020.108620] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Revised: 09/29/2020] [Accepted: 10/02/2020] [Indexed: 02/06/2023]
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13
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Huang Y, Du H, Kamal GM, Cao Q, Liu C, Xiong S, Manyande A, Huang Q. Studies on the Binding Interactions of Grass Carp (Ctenopharyngodon idella) Myosin with Chlorogenic Acid and Rosmarinic Acid. FOOD BIOPROCESS TECH 2020. [DOI: 10.1007/s11947-020-02483-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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14
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Covalent modification of food proteins by plant-based ingredients (polyphenols and organosulphur compounds): A commonplace reaction with novel utilization potential. Trends Food Sci Technol 2020. [DOI: 10.1016/j.tifs.2020.04.023] [Citation(s) in RCA: 54] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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15
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Wei Z, Huang Q. Impact of covalent or non-covalent bound epigallocatechin-3-gallate (EGCG) on assembly, physicochemical characteristics and digestion of ovotransferrin fibrils. Food Hydrocoll 2020. [DOI: 10.1016/j.foodhyd.2019.105314] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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16
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Jongberg S, Racanicci AM, Skibsted LH. Mate extract is superior to green tea extract in the protection against chicken meat protein thiol oxidation. Food Chem 2019; 300:125134. [DOI: 10.1016/j.foodchem.2019.125134] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Revised: 07/04/2019] [Accepted: 07/05/2019] [Indexed: 12/01/2022]
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17
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Shu N, Cheng Q, Arnér ESJ, Davies MJ. Inhibition and crosslinking of the selenoprotein thioredoxin reductase-1 by p-benzoquinone. Redox Biol 2019; 28:101335. [PMID: 31590044 PMCID: PMC6812298 DOI: 10.1016/j.redox.2019.101335] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2019] [Revised: 09/23/2019] [Accepted: 09/26/2019] [Indexed: 11/03/2022] Open
Abstract
Quinones are common in nature, and often cytotoxic. Their proposed toxicity mechanisms involve redox cycling with radical generation, and/or reactions with nucleophiles, such as protein cysteine (Cys) residues, forming adducts via Michael addition reactions. The selenenyl anion of selenocysteine (Sec) is a stronger nucleophile, more prevalent at physiological pH, and more reactive than the corresponding thiolate anion of Cys. We therefore hypothesized that Sec residues should be readily modified by quinones and with potential consequences for the structure and function of selenoproteins. Here, we report data on the interaction of p-benzoquinone (BQ) with the selenoprotein thioredoxin reductase-1 (TrxR1), which exposes an accessible Sec residue upon physiological reduction by NADPH. Our results reveal that BQ targets NADPH-reduced TrxR1 and inhibits its activity using 5,5′-dithiobis(2-nitrobenzoic acid) or juglone as model substrates, consistent with the targeting of both the Cys and Sec residues of TrxR1. In the absence of NADPH, BQ modified the non-catalytic Cys residues, leading to subunit crosslinking, mainly through disulfides, which also resulted in some loss of activity. This crosslinking was time-dependent and independent of the Sec residue. Addition of NADPH after BQ pre-treatment could resolve the disulfide-linked crosslinking. TrxR activity loss was also observed upon incubation of J774A.1 cells or cell lysates with BQ. These data suggest that BQ readily targets TrxR1, albeit in a rather complex manner, which results in structural changes and loss of enzyme activity. We suggest that TrxR1 targeting can explain some of the cytotoxicity of BQ, and potentially also that of other quinone compounds.
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Affiliation(s)
- Nan Shu
- Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, 2200, Copenhagen, Denmark
| | - Qing Cheng
- Division of Biochemistry, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, 171 77, Stockholm, Sweden
| | - Elias S J Arnér
- Division of Biochemistry, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, 171 77, Stockholm, Sweden
| | - Michael J Davies
- Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, 2200, Copenhagen, Denmark.
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18
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Wei Z, Huang Q. Modulation of Formation, Physicochemical Properties, and Digestion of Ovotransferrin Nanofibrils with Covalent or Non-Covalent Bound Gallic Acid. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2019; 67:9907-9915. [PMID: 31436102 DOI: 10.1021/acs.jafc.9b02630] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The impact of covalent or non-covalent bound gallic acid (GA) on the formation, physicochemical properties, and digestion of ovotransferrin (OTF) nanofibrils was comprehensively studied. Thioflavin T fluorescence results revealed that bound GA could inhibit OTF nanofibrillation and that the fibril-inhibitory activity of bound GA was dose dependent. Covalent bound GA exerted stronger inhibition on OTF nanofibrillation than an equal amount of non-covalent bound GA. Atomic force microscopy revealed that covalent bound GA shortened OTF nanofibrils significantly, while non-covalent bound GA did not change the contour length of OTF fibrils remarkably. Bound GA altered diameter of OTF nanofibrils. Both covalent and non-covalent bound GA could alter the zeta potential, surface hydrophobicity, and rheological properties of OTF nanofibrils. Bound GA endowed OTF nanofibrils with a strong antioxidant activity. In vitro gastrointestinal digestion results showed that covalent bound GA elevated the fibril digestion rate better than non-covalent bound GA. Polyphenol binding provided a new approach to modulating the physicochemical properties of protein nanofibrils.
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Affiliation(s)
- Zihao Wei
- Department of Food Science , Rutgers University , 65 Dudley Road , New Brunswick , New Jersey 08901 , United States
| | - Qingrong Huang
- Department of Food Science , Rutgers University , 65 Dudley Road , New Brunswick , New Jersey 08901 , United States
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19
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Wu L, Shao H, Fang Z, Zhao Y, Cao CY, Li Q. Mechanism and Effects of Polyphenol Derivatives for Modifying Collagen. ACS Biomater Sci Eng 2019; 5:4272-4284. [PMID: 33417783 DOI: 10.1021/acsbiomaterials.9b00593] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Leping Wu
- Key Lab. of Oral Diseases Research of Anhui Province, College & Hospital of Stomatology, Anhui Medical University, Hefei 230032, China
| | - Hui Shao
- Key Lab. of Oral Diseases Research of Anhui Province, College & Hospital of Stomatology, Anhui Medical University, Hefei 230032, China
| | - Zehui Fang
- Key Lab. of Oral Diseases Research of Anhui Province, College & Hospital of Stomatology, Anhui Medical University, Hefei 230032, China
| | - Yuancong Zhao
- Key Lab. of Advanced Technology for Materials of Education Ministry, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
| | - Chris Ying Cao
- Key Lab. of Oral Diseases Research of Anhui Province, College & Hospital of Stomatology, Anhui Medical University, Hefei 230032, China
| | - Quanli Li
- Key Lab. of Oral Diseases Research of Anhui Province, College & Hospital of Stomatology, Anhui Medical University, Hefei 230032, China
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20
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Effect of green tea catechins on physical stability and sensory quality of lactose-reduced UHT milk during storage for one year. Int Dairy J 2019. [DOI: 10.1016/j.idairyj.2019.03.007] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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21
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Padalino L, Costa C, Del Nobile MA, Conte A. Extract of
Salicornia europaea
in fresh pasta to enhance phenolic compounds and antioxidant activity. Int J Food Sci Technol 2019. [DOI: 10.1111/ijfs.14218] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Lucia Padalino
- Department of Agricultural Sciences, Food and the Environment University of Foggia via Napoli, 25 Foggia Italy
| | - Cristina Costa
- Department of Agricultural Sciences, Food and the Environment University of Foggia via Napoli, 25 Foggia Italy
| | | | - Amalia Conte
- Department of Agricultural Sciences, Food and the Environment University of Foggia via Napoli, 25 Foggia Italy
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22
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Shu N, Lorentzen LG, Davies MJ. Reaction of quinones with proteins: Kinetics of adduct formation, effects on enzymatic activity and protein structure, and potential reversibility of modifications. Free Radic Biol Med 2019; 137:169-180. [PMID: 31026584 DOI: 10.1016/j.freeradbiomed.2019.04.026] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/20/2019] [Revised: 04/22/2019] [Accepted: 04/22/2019] [Indexed: 01/08/2023]
Abstract
Quinones are a common motif in many biological compounds, and have been linked to tissue damage as they can undergo redox cycling to generate radicals, and/or act as Michael acceptors with nucleophiles, such as protein Cys residues, with consequent adduct formation. The kinetics and consequences of these Michael reactions are poorly characterized. In this study we hypothesized that adduction of protein Cys residues with quinones would be rapid, structure-dependent, quantitatively-significant, and result in altered protein structure and function. Multiple quinones were incubated with glyceraldehyde-3-phosphate dehydrogenase (GAPDH), creatine kinase (CK), papain, bovine (BSA) and human (HSA) serum albumins, with the kinetics of adduction and effects on protein structure and activity determined. Adduction rate constants at Cys residues, which were dependent on the quinone and protein structure, and thiol pKa, are in the range 102-105 M-1 s-1. p-Benzoquinone (BQ) induced dimerization of GAPDH and CK (but not BSA, HSA, or papain) in a dose- and time-dependent manner. Incubation of purified proteins, or cell lysates, with quinones resulted in a rapid loss of GAPDH and CK activity; this loss correlated well with the rate constant for Cys adduction. Glutathione (GSH) reacts competitively with quinones, and could reverse the loss of activity and dimerization of GAPDH and CK. Mass spectrometry peptide mass mapping provided evidence for BQ adduction to GAPDH to specific Cys residues (Cys149, Cys244), whereas all Cys residues in CK were modified. These data suggested that quinones can induce biological effects by rapid and selective formation of adducts with Cys residues in proteins.
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Affiliation(s)
- Nan Shu
- Department of Biomedical Sciences, Panum Institute, University of Copenhagen, Denmark
| | - Lasse G Lorentzen
- Department of Biomedical Sciences, Panum Institute, University of Copenhagen, Denmark
| | - Michael J Davies
- Department of Biomedical Sciences, Panum Institute, University of Copenhagen, Denmark.
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23
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Jeong HG, Han YS, Jung KH, Kim YJ. Poly(vinylidene fluoride) Composite Nanofibers Containing Polyhedral Oligomeric Silsesquioxane⁻Epigallocatechin Gallate Conjugate for Bone Tissue Regeneration. NANOMATERIALS 2019; 9:nano9020184. [PMID: 30717229 PMCID: PMC6409983 DOI: 10.3390/nano9020184] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/14/2019] [Revised: 01/23/2019] [Accepted: 01/29/2019] [Indexed: 01/03/2023]
Abstract
To provide adequate conditions for the regeneration of damaged bone, it is necessary to develop piezoelectric porous membranes with antioxidant and anti-inflammatory activities. In this study, composite nanofibers comprising poly(vinylidene fluoride) (PVDF) and a polyhedral oligomeric silsesquioxane–epigallocatechin gallate (POSS–EGCG) conjugate were fabricated by electrospinning methods. The resulting composite nanofibers showed three-dimensionally interconnected porous structures. Their average diameters, ranging from 936 ± 223 nm to 1094 ± 394 nm, were hardly affected by the addition of the POSS–EGCG conjugate. On the other hand, the piezoelectric β-phase increased significantly from 77.4% to 88.1% after adding the POSS–EGCG conjugate. The mechanical strength of the composite nanofibers was ameliorated by the addition of the POSS–EGCG conjugate. The results of in vitro bioactivity tests exhibited that the proliferation and differentiation of osteoblasts (MC3T3-E1) on the nanofibers increased with the content of POSS–EGCG conjugate because of the improved piezoelectricity and antioxidant and anti-inflammatory properties of the nanofibers. All results could suggest that the PVDF composite nanofibers were effective for guided bone regeneration.
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Affiliation(s)
- Hyo-Geun Jeong
- Department of Biomedical Engineering, Daegu Catholic University, Gyeongsan 38430, Korea.
| | - Yoon-Soo Han
- Department of Advanced Materials and Chemical Engineering, Daegu Catholic University, Gyeongsan 38430, Korea.
| | - Kyung-Hye Jung
- Department of Advanced Materials and Chemical Engineering, Daegu Catholic University, Gyeongsan 38430, Korea.
| | - Young-Jin Kim
- Department of Biomedical Engineering, Daegu Catholic University, Gyeongsan 38430, Korea.
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24
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Ding J, Xu Z, Qi B, Jiang L, Sui X. Physicochemical and oxidative stability of a soybean oleosome-based emulsion and its in vitro digestive fate as affected by (-)-epigallocatechin-3-gallate. Food Funct 2018; 9:6146-6154. [PMID: 30379168 DOI: 10.1039/c8fo01215f] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2023]
Abstract
Oleosomes, which are pre-emulsified oil bodies found naturally in plants, have excellent stability, therefore making their use more popular in the food industries. However, the mechanism of EGCG in regulating the physicochemical and oxidative stability, and digestion of oleosome emulsions is not yet clear. In this study, the effect of EGCG on the properties of soybean oleosome emulsions (SOE) was examined at different pH values (5.0, 7.0, and 9.0). EGCG was significantly more effective in maintaining the stability of SOE at pH 5.0 and 7.0 over the 14 days of storage, but less effective at pH 9.0. Furthermore, lipid oxidation of SOE at pH 7.0 was successfully retarded by incorporating EGCG, but not at pH 5.0 and 9.0. The in vitro gastrointestinal results suggested that EGCG retarded the digestion rate of SOE based on a 20% reduction in free fatty acid release. The results of this study will help food technologists to design slow-digestive oleosome-based products that will satisfy health-conscious consumers' demand for healthier food choices.
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Affiliation(s)
- Jian Ding
- College of Food Science, Northeast Agricultural University, China.
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25
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Konar M, Ghosh D, Roy P, Dasgupta S. Probing the role of ortho-dihydroxy groups on lysozyme fibrillation. Int J Biol Macromol 2018; 109:619-628. [DOI: 10.1016/j.ijbiomac.2017.12.115] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2017] [Revised: 12/17/2017] [Accepted: 12/20/2017] [Indexed: 01/14/2023]
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26
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Sekowski S, Terebka M, Veiko A, Lapshina E, Sulkowska U, Zavodnik IB, Abdulladjanova N, Mavlyanov S, Roszkowska A, Zamaraeva M. Epigallocatechin gallate (EGCG) activity against UV light-induced photo damages in erythrocytes and serum albumin—theoretical and experimental studies. J Photochem Photobiol A Chem 2018. [DOI: 10.1016/j.jphotochem.2018.01.018] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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27
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Lee YH, Jang YH, Byun YH, Cheong Y, Kim P, Lee YJ, Lee YJ, Sung JM, Son A, Lee HM, Lee J, Yang SW, Song JM, Seong BL. Green Tea Catechin-Inactivated Viral Vaccine Platform. Front Microbiol 2017; 8:2469. [PMID: 29312180 PMCID: PMC5732980 DOI: 10.3389/fmicb.2017.02469] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2017] [Accepted: 11/28/2017] [Indexed: 11/22/2022] Open
Abstract
Traditionally, chemical agents such as formalin (FA) and β-propiolactone (BPL) have long been used for the preparation of inactivated vaccines or toxoids. It has been shown that FA extensively modifies vaccine antigens and thus affects immunogenicity profiles, sometimes compromising the protective efficacy of the vaccines or even exacerbating the disease upon infection. In this study, we show that natural catechins from green tea extracts (GT) can be used as an inactivating agent to prepare inactivated viral vaccines. GT treatment resulted in complete and irreversible inactivation of influenza virus as well as dengue virus. In contrast to FA that reacted extensively with multiple amino acids including lysine, a major anchor residue for epitope binding to MHC molecules, GT catechin epigallocatechin-3-gallate (EGCG) crosslinked primarily with cysteine residues and thus preserved the major epitopes of the influenza hemagglutinin. In a mouse model, vaccination with GT-inactivated influenza virus (GTi virus) elicited higher levels of viral neutralizing antibodies than FA-inactivated virus (FAi virus). The vaccination completely protected the mice from a lethal challenge and restricted the challenge viral replication in the lungs. Of note, the quality of antibody responses of GTi virus was superior to that with FAi virus, in terms of the magnitude of antibody titer, cross-reactivity to hetero-subtypes of influenza viruses, and the avidity to viral antigens. As the first report of using non-toxic natural compounds for the preparation of inactivated viral vaccines, the present results could be translated into a clinically relevant vaccine platform with improved efficacy, safety, productivity, and public acceptance.
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Affiliation(s)
- Yun H Lee
- Department of Biotechnology, College of Life Science and Biotechnology, Yonsei University, Seoul, South Korea
| | - Yo H Jang
- Department of Biotechnology, College of Life Science and Biotechnology, Yonsei University, Seoul, South Korea
| | - Young H Byun
- Department of Biotechnology, College of Life Science and Biotechnology, Yonsei University, Seoul, South Korea
| | - Yucheol Cheong
- Department of Biotechnology, College of Life Science and Biotechnology, Yonsei University, Seoul, South Korea
| | - Paul Kim
- Department of Biotechnology, College of Life Science and Biotechnology, Yonsei University, Seoul, South Korea
| | - Young J Lee
- Department of Biotechnology, College of Life Science and Biotechnology, Yonsei University, Seoul, South Korea
| | - Yoon J Lee
- Department of Biotechnology, College of Life Science and Biotechnology, Yonsei University, Seoul, South Korea
| | - Je M Sung
- Department of Biotechnology, College of Life Science and Biotechnology, Yonsei University, Seoul, South Korea
| | - Ahyun Son
- Department of Biotechnology, College of Life Science and Biotechnology, Yonsei University, Seoul, South Korea
| | - Hye M Lee
- Department of Biotechnology, College of Life Science and Biotechnology, Yonsei University, Seoul, South Korea
| | - Jinhee Lee
- Department of Biotechnology, College of Life Science and Biotechnology, Yonsei University, Seoul, South Korea
| | - Seung W Yang
- Department of Biotechnology, College of Life Science and Biotechnology, Yonsei University, Seoul, South Korea
| | - Jae-Min Song
- Department of Global Medical Science, Health and Wellness College, Sungshin Women's University, Seoul, South Korea
| | - Baik L Seong
- Department of Biotechnology, College of Life Science and Biotechnology, Yonsei University, Seoul, South Korea.,Vaccine Translational Research Center, Yonsei University, Seoul, South Korea
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28
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Jansson T, Rauh V, Danielsen BP, Poojary MM, Waehrens SS, Bredie WLP, Sørensen J, Petersen MA, Ray CA, Lund MN. Green Tea Polyphenols Decrease Strecker Aldehydes and Bind to Proteins in Lactose-Hydrolyzed UHT Milk. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2017; 65:10550-10561. [PMID: 29119790 DOI: 10.1021/acs.jafc.7b04137] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The effect of epigallocatechin gallate enriched green tea extract (GTE) on flavor, Maillard reactions and protein modifications in lactose-hydrolyzed (LH) ultrahigh temperature (UHT) processed milk was examined during storage at 40 °C for up to 42 days. Addition of GTE inhibited the formation of Strecker aldehydes by up to 95% compared to control milk, and the effect was similar when GTE was added either before or after UHT treatment. Release of free amino acids, caused by proteolysis, during storage was also decreased in GTE-added milk either before or after UHT treatment compared to control milk. Binding of polyphenols to milk proteins was observed in both fresh and stored milk samples. The inhibition of Strecker aldehyde formation by GTE may be explained by two different mechanisms; inhibition of proteolysis during storage by GTE or binding of amino acids and proteins to the GTE polyphenols.
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Affiliation(s)
- Therese Jansson
- Department of Food Science, University of Copenhagen , Rolighedsvej 26, 1958 Frederiksberg C, Denmark
| | - Valentin Rauh
- Arla Foods R&D , Agro Food Park 19, 8200 Aarhus N, Denmark
| | - Bente P Danielsen
- Department of Food Science, University of Copenhagen , Rolighedsvej 26, 1958 Frederiksberg C, Denmark
| | - Mahesha M Poojary
- Department of Food Science, University of Copenhagen , Rolighedsvej 26, 1958 Frederiksberg C, Denmark
| | - Sandra S Waehrens
- Department of Food Science, University of Copenhagen , Rolighedsvej 26, 1958 Frederiksberg C, Denmark
| | - Wender L P Bredie
- Department of Food Science, University of Copenhagen , Rolighedsvej 26, 1958 Frederiksberg C, Denmark
| | - John Sørensen
- Arla Foods R&D , Agro Food Park 19, 8200 Aarhus N, Denmark
| | - Mikael A Petersen
- Department of Food Science, University of Copenhagen , Rolighedsvej 26, 1958 Frederiksberg C, Denmark
| | - Colin A Ray
- Department of Food Science, University of Copenhagen , Rolighedsvej 26, 1958 Frederiksberg C, Denmark
| | - Marianne N Lund
- Department of Food Science, University of Copenhagen , Rolighedsvej 26, 1958 Frederiksberg C, Denmark
- Department of Biomedical Sciences, University of Copenhagen , Blegdamsvej 3, 2200 Copenhagen N, Denmark
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29
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Roy P, Dinda AK, Chaudhury S, Dasgupta S. β-cyclodextrin encapsulated polyphenols as effective antioxidants. Biopolymers 2017; 109. [DOI: 10.1002/bip.23084] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2017] [Revised: 10/09/2017] [Accepted: 10/24/2017] [Indexed: 11/09/2022]
Affiliation(s)
- Pritam Roy
- Department of Chemistry; Indian Institute of Technology Kharagpur; Kharagpur 721302 India
| | - Amit Kumar Dinda
- Department of Chemistry; Indian Institute of Technology Kharagpur; Kharagpur 721302 India
| | | | - Swagata Dasgupta
- Department of Chemistry; Indian Institute of Technology Kharagpur; Kharagpur 721302 India
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30
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Effects of chemical composition and baking on in vitro digestibility of proteins in breads made from selected gluten-containing and gluten-free flours. Food Chem 2017; 233:514-524. [DOI: 10.1016/j.foodchem.2017.04.158] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2016] [Revised: 04/17/2017] [Accepted: 04/25/2017] [Indexed: 12/25/2022]
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31
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Cao Y, Xiong YL. Binding of Gallic Acid and Epigallocatechin Gallate to Heat-Unfolded Whey Proteins at Neutral pH Alters Radical Scavenging Activity of in Vitro Protein Digests. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2017; 65:8443-8450. [PMID: 28876921 DOI: 10.1021/acs.jafc.7b03006] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Preheated (80 °C for 9 min) whey protein isolate (HWPI) was reacted with 20, 120, and 240 μmol/g (protein basis) gallic acid (GA) or epigallocatechin gallate (EGCG) at neutral pH and 25 °C. Isothermal titration calorimetry and fluorometry showed a similar trend that GA binding to HWPI was moderate but weaker than EGCG binding. However, the shift of maximal fluorescence emission wavelength in opposite directions in response to GA (blue) and EGCG (red) suggests discrepant binding patterns. Electrophoresis results showed that EGCG induced formation of HWPI complexes while GA only had a marginal effect. Both free and phenolic-bound HWPI exhibited mild antiradical activity. However, when subjected to in vitro digestion, synergistic radical-scavenging activity was produced between the phenolics and peptides with the highest synergism being observed on 120 μmol/g phenolics.
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Affiliation(s)
- Yanyun Cao
- State Key Laboratory of Food Science and Technology and School of Food Science and Technology, Jiangnan University , Wuxi, Jiangsu 214122, China
| | - Youling L Xiong
- State Key Laboratory of Food Science and Technology and School of Food Science and Technology, Jiangnan University , Wuxi, Jiangsu 214122, China
- Department of Animal and Food Sciences, University of Kentucky , Lexington, Kentucky 40546, United States
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32
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Green Tea Extracts Epigallocatechin-3-gallate for Different Treatments. BIOMED RESEARCH INTERNATIONAL 2017; 2017:5615647. [PMID: 28884125 PMCID: PMC5572593 DOI: 10.1155/2017/5615647] [Citation(s) in RCA: 170] [Impact Index Per Article: 24.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/18/2017] [Accepted: 06/28/2017] [Indexed: 02/05/2023]
Abstract
Epigallocatechin-3-gallate (EGCG), a component extracted from green tea, has been proved to have multiple effects on human pathological and physiological processes, and its mechanisms are discrepant in cancer, vascularity, bone regeneration, and nervous system. Although there are multiple benefits associated with EGCG, more and more challenges are still needed to get through. For example, EGCG shows low bioactivity via oral administration. This review focuses on effects of EGCG, including anti-cancer, antioxidant, anti-inflammatory, anticollagenase, and antifibrosis effects, to express the potential of EGCG and necessity of further studies in this field.
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Liu Z, Nakashima S, Nakamura T, Munemasa S, Murata Y, Nakamura Y. (-)-Epigallocatechin-3-gallate inhibits human angiotensin-converting enzyme activity through an autoxidation-dependent mechanism. J Biochem Mol Toxicol 2017; 31. [PMID: 28544013 DOI: 10.1002/jbt.21932] [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: 02/28/2017] [Accepted: 04/06/2017] [Indexed: 11/07/2022]
Abstract
We investigated the molecular mechanisms involved in the angiotensin-converting enzyme (ACE) inhibition by (-)-epigallocatechin-3-gallate (EGCg), a major tea catechin. EGCg inhibited both the ACE activity in the lysate of human colorectal cancer cells and human recombinant ACE (rh-ACE) in a dose-dependent manner. Co-incubation with zinc sulfate showed no influence on the rh-ACE inhibition by EGCg, whereas it completely counteracted the inhibitory effect of ethylenediaminetetraacetic acid, a chelating-type ACE inhibitor. Although hydrogen peroxide was produced by the autoxidation of EGCg, hydrogen peroxide itself had little effect on the ACE activity. Conversely, the co-incubation of EGCg with borate or ascorbic acid significantly diminished the EGCg inhibition. A redox-cycling staining experiment revealed that rh-ACE was covalently modified by EGCg. A Lineweaver-Burk plot analysis indicated that EGCg inhibited the ACE activity in a non-competitive manner. These results suggested that EGCg might allosterically inhibit the ACE activity through oxidative conversion into an electrophilic quinone.
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Affiliation(s)
- Zhe Liu
- Graduate School of Environmental and Life Science, Okayama University, Okayama, 700-8530, Japan
| | - Sayaka Nakashima
- Graduate School of Environmental and Life Science, Okayama University, Okayama, 700-8530, Japan
| | - Toshiyuki Nakamura
- Graduate School of Environmental and Life Science, Okayama University, Okayama, 700-8530, Japan
| | - Shintaro Munemasa
- Graduate School of Environmental and Life Science, Okayama University, Okayama, 700-8530, Japan
| | - Yoshiyuki Murata
- Graduate School of Environmental and Life Science, Okayama University, Okayama, 700-8530, Japan
| | - Yoshimasa Nakamura
- Graduate School of Environmental and Life Science, Okayama University, Okayama, 700-8530, Japan
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Heterocycles of Natural Origin as Non-Toxic Reagents for Cross-Linking of Proteins and Polysaccharides. Chem Heterocycl Compd (N Y) 2017. [DOI: 10.1007/s10593-017-2016-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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Izzo V, Pietrocola F, Sica V, Durand S, Lachkar S, Enot D, Bravo-San Pedro JM, Chery A, Esposito S, Raia V, Maiuri L, Maiuri MC, Kroemer G. Metabolic interactions between cysteamine and epigallocatechin gallate. Cell Cycle 2017; 16:271-279. [PMID: 28059601 DOI: 10.1080/15384101.2016.1249550] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
Abstract
Phase II clinical trials indicate that the combination of cysteamine plus epigallocatechin gallate (EGCG) is effective against cystic fibrosis in patients bearing the most frequent etiological mutation (CFTRΔF508). Here, we investigated the interaction between both agents on cultured respiratory epithelia cells from normal and CFTRΔF508-mutated donors. We observed that the combination of both agents affected metabolic circuits (and in particular the tricarboxylic acid cycle) in a unique way and that cysteamine plus EGCG reduced cytoplasmic protein acetylation more than each of the 2 components alone. In a cell-free system, protein cross-linking activity of EGCG was suppressed by cysteamine. Finally, EGCG was able to enhance the conversion of cysteamine into taurine in metabolic flux experiments. Altogether, these results indicate that multiple pharmacological interactions occur between cysteamine and EGCG, suggesting that they contribute to the unique synergy of both agents in restoring the function of mutated CFTRΔF508.
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Affiliation(s)
- Valentina Izzo
- a Equipe 11 labellisée Ligue contre le Cancer, Centre de Recherche des Cordeliers , INSERM U 1138, Paris , France.,b Université Paris Descartes, Sorbonne Paris Cité , Paris , France.,c Université Pierre et Marie Curie , Paris , France.,d Metabolomics and Cell Biology Platforms, Gustave Roussy Comprehensive Cancer Institute , Villejuif , France
| | - Federico Pietrocola
- a Equipe 11 labellisée Ligue contre le Cancer, Centre de Recherche des Cordeliers , INSERM U 1138, Paris , France.,b Université Paris Descartes, Sorbonne Paris Cité , Paris , France.,c Université Pierre et Marie Curie , Paris , France.,d Metabolomics and Cell Biology Platforms, Gustave Roussy Comprehensive Cancer Institute , Villejuif , France
| | - Valentina Sica
- a Equipe 11 labellisée Ligue contre le Cancer, Centre de Recherche des Cordeliers , INSERM U 1138, Paris , France.,b Université Paris Descartes, Sorbonne Paris Cité , Paris , France.,c Université Pierre et Marie Curie , Paris , France.,d Metabolomics and Cell Biology Platforms, Gustave Roussy Comprehensive Cancer Institute , Villejuif , France.,e Université Paris Sud, Faculté de Médecine , Kremlin Bicêtre , France
| | - Sylvère Durand
- a Equipe 11 labellisée Ligue contre le Cancer, Centre de Recherche des Cordeliers , INSERM U 1138, Paris , France.,b Université Paris Descartes, Sorbonne Paris Cité , Paris , France.,c Université Pierre et Marie Curie , Paris , France.,d Metabolomics and Cell Biology Platforms, Gustave Roussy Comprehensive Cancer Institute , Villejuif , France
| | - Sylvie Lachkar
- a Equipe 11 labellisée Ligue contre le Cancer, Centre de Recherche des Cordeliers , INSERM U 1138, Paris , France.,b Université Paris Descartes, Sorbonne Paris Cité , Paris , France.,c Université Pierre et Marie Curie , Paris , France.,d Metabolomics and Cell Biology Platforms, Gustave Roussy Comprehensive Cancer Institute , Villejuif , France
| | - David Enot
- a Equipe 11 labellisée Ligue contre le Cancer, Centre de Recherche des Cordeliers , INSERM U 1138, Paris , France.,b Université Paris Descartes, Sorbonne Paris Cité , Paris , France.,c Université Pierre et Marie Curie , Paris , France.,d Metabolomics and Cell Biology Platforms, Gustave Roussy Comprehensive Cancer Institute , Villejuif , France
| | - José Manuel Bravo-San Pedro
- a Equipe 11 labellisée Ligue contre le Cancer, Centre de Recherche des Cordeliers , INSERM U 1138, Paris , France.,b Université Paris Descartes, Sorbonne Paris Cité , Paris , France.,c Université Pierre et Marie Curie , Paris , France.,d Metabolomics and Cell Biology Platforms, Gustave Roussy Comprehensive Cancer Institute , Villejuif , France
| | - Alexis Chery
- a Equipe 11 labellisée Ligue contre le Cancer, Centre de Recherche des Cordeliers , INSERM U 1138, Paris , France.,b Université Paris Descartes, Sorbonne Paris Cité , Paris , France.,c Université Pierre et Marie Curie , Paris , France.,d Metabolomics and Cell Biology Platforms, Gustave Roussy Comprehensive Cancer Institute , Villejuif , France
| | - Speranza Esposito
- f European Institute for Research in Cystic Fibrosis, Division of Genetics and Cell Biology, San Raffaele Scientific Institute , Milan , Italy
| | - Valeria Raia
- g Regional Cystic Fibrosis Center, Pediatric Unit, Department of Translational Medical Sciences , Federico II University , Naples , Italy
| | - Luigi Maiuri
- f European Institute for Research in Cystic Fibrosis, Division of Genetics and Cell Biology, San Raffaele Scientific Institute , Milan , Italy.,h SCDU of Pediatrics, Department of Health Sciences , University of Piemonte Orientale , Novara , Italy
| | - Maria Chiara Maiuri
- a Equipe 11 labellisée Ligue contre le Cancer, Centre de Recherche des Cordeliers , INSERM U 1138, Paris , France.,b Université Paris Descartes, Sorbonne Paris Cité , Paris , France.,c Université Pierre et Marie Curie , Paris , France.,d Metabolomics and Cell Biology Platforms, Gustave Roussy Comprehensive Cancer Institute , Villejuif , France
| | - Guido Kroemer
- a Equipe 11 labellisée Ligue contre le Cancer, Centre de Recherche des Cordeliers , INSERM U 1138, Paris , France.,b Université Paris Descartes, Sorbonne Paris Cité , Paris , France.,c Université Pierre et Marie Curie , Paris , France.,d Metabolomics and Cell Biology Platforms, Gustave Roussy Comprehensive Cancer Institute , Villejuif , France.,i Pôle de Biologie, Hôpital Européen Georges Pompidou, AP-HP , Paris , France.,j Karolinska Institute, Department of Women's and Children's Health , Karolinska University Hospital , Stockholm , Sweden
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Salazar PB, de Athayde Moncorvo Collado A, Canal-Martínez V, Minahk CJ. Differential inhibition of human erythrocyte acetylcholinesterase by polyphenols epigallocatechin-3-gallate and resveratrol. Relevance of the membrane-bound form. Biofactors 2017; 43:73-81. [PMID: 27591048 DOI: 10.1002/biof.1322] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/06/2016] [Revised: 07/29/2016] [Accepted: 08/01/2016] [Indexed: 01/20/2023]
Abstract
The activity of acetylcholinesterase (AChE) from human erythrocytes was tested in the presence of the phenolic compounds resveratrol and epigallocatechin-3-gallate (EGCG). Even though the stilbene barely changed this enzymatic activity, EGCG did inhibit AChE. Importantly, it preferentially acted on the membrane-bound enzyme rather than on its soluble form. Actually, it was shown that this flavonoid may bind to the red blood cell membrane surface, which may improve the interaction between EGCG and AChE. Therefore, caution should be taken when screening AChE inhibitors. In fact, testing compounds with the soluble form of the enzyme may underestimate the activity of some of these potential inhibitors, hence it would be advisable not to use them as a sole model system for screening. Moreover, erythrocyte AChE is proposed as a good model for these enzymatic assays. © 2016 BioFactors, 43(1):73-81, 2017.
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Affiliation(s)
- Paula B Salazar
- Instituto Superior de Investigaciones Biológicas (CONICET-UNT) and Instituto de Química Biológica ''Dr. Bernabe Bloj'', Facultad de Bioquímica, Química y Farmacia (UNT), Tucumán, Argentina
| | - Alejandro de Athayde Moncorvo Collado
- Instituto Superior de Investigaciones Biológicas (CONICET-UNT) and Instituto de Química Biológica ''Dr. Bernabe Bloj'', Facultad de Bioquímica, Química y Farmacia (UNT), Tucumán, Argentina
| | - Verónica Canal-Martínez
- Instituto Superior de Investigaciones Biológicas (CONICET-UNT) and Instituto de Química Biológica ''Dr. Bernabe Bloj'', Facultad de Bioquímica, Química y Farmacia (UNT), Tucumán, Argentina
| | - Carlos J Minahk
- Instituto Superior de Investigaciones Biológicas (CONICET-UNT) and Instituto de Química Biológica ''Dr. Bernabe Bloj'', Facultad de Bioquímica, Química y Farmacia (UNT), Tucumán, Argentina
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Talalaeva OS, Zverev YF, Bryukhanov VM. Mechanisms of Antiradical Activity of 2,3,5,6,8-Pentahydroxy-7-Ethyl-1,4-Naphthoquinone (A Review). Pharm Chem J 2016. [DOI: 10.1007/s11094-016-1450-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Dickson CJ, Hornak V, Velez-Vega C, McKay DJJ, Reilly J, Sandham DA, Shaw D, Fairhurst RA, Charlton SJ, Sykes DA, Pearlstein RA, Duca JS. Uncoupling the Structure-Activity Relationships of β2 Adrenergic Receptor Ligands from Membrane Binding. J Med Chem 2016; 59:5780-9. [PMID: 27239696 DOI: 10.1021/acs.jmedchem.6b00358] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Ligand binding to membrane proteins may be significantly influenced by the interaction of ligands with the membrane. In particular, the microscopic ligand concentration within the membrane surface solvation layer may exceed that in bulk solvent, resulting in overestimation of the intrinsic protein-ligand binding contribution to the apparent/measured affinity. Using published binding data for a set of small molecules with the β2 adrenergic receptor, we demonstrate that deconvolution of membrane and protein binding contributions allows for improved structure-activity relationship analysis and structure-based drug design. Molecular dynamics simulations of ligand bound membrane protein complexes were used to validate binding poses, allowing analysis of key interactions and binding site solvation to develop structure-activity relationships of β2 ligand binding. The resulting relationships are consistent with intrinsic binding affinity (corrected for membrane interaction). The successful structure-based design of ligands targeting membrane proteins may require an assessment of membrane affinity to uncouple protein binding from membrane interactions.
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Affiliation(s)
- Callum J Dickson
- Computer-Aided Drug Discovery, Global Discovery Chemistry, Novartis Institutes for BioMedical Research , 100 Technology Square, Cambridge, Massachusetts 02139, United States
| | - Viktor Hornak
- Computer-Aided Drug Discovery, Global Discovery Chemistry, Novartis Institutes for BioMedical Research , 100 Technology Square, Cambridge, Massachusetts 02139, United States
| | - Camilo Velez-Vega
- Computer-Aided Drug Discovery, Global Discovery Chemistry, Novartis Institutes for BioMedical Research , 100 Technology Square, Cambridge, Massachusetts 02139, United States
| | - Daniel J J McKay
- Computer-Aided Drug Discovery, Global Discovery Chemistry, Novartis Institutes for BioMedical Research , 100 Technology Square, Cambridge, Massachusetts 02139, United States
| | - John Reilly
- Global Discovery Chemistry, Novartis Institutes for BioMedical Research , 100 Technology Square, Cambridge, Massachusetts 02139, United States
| | - David A Sandham
- Global Discovery Chemistry, Novartis Institutes for BioMedical Research , 100 Technology Square, Cambridge, Massachusetts 02139, United States
| | - Duncan Shaw
- Global Discovery Chemistry, Novartis Institutes for BioMedical Research , 100 Technology Square, Cambridge, Massachusetts 02139, United States
| | - Robin A Fairhurst
- Global Discovery Chemistry, Novartis Institutes for BioMedical Research, Novartis Pharma AG , Werk Klybeck, Postfach, CH-4002 Basel, Switzerland
| | - Steven J Charlton
- Cell Signalling Research Group, School of Life Sciences, University of Nottingham, Queen's Medical Centre , Nottingham NG7 2UH, U.K
| | - David A Sykes
- Cell Signalling Research Group, School of Life Sciences, University of Nottingham, Queen's Medical Centre , Nottingham NG7 2UH, U.K
| | - Robert A Pearlstein
- Computer-Aided Drug Discovery, Global Discovery Chemistry, Novartis Institutes for BioMedical Research , 100 Technology Square, Cambridge, Massachusetts 02139, United States
| | - Jose S Duca
- Computer-Aided Drug Discovery, Global Discovery Chemistry, Novartis Institutes for BioMedical Research , 100 Technology Square, Cambridge, Massachusetts 02139, United States
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Acetone Extract of Almond Hulls Provides Protection against Oxidative Damage and Membrane Protein Degradation. J Acupunct Meridian Stud 2016; 9:134-42. [DOI: 10.1016/j.jams.2015.10.001] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2015] [Revised: 10/19/2015] [Accepted: 10/26/2015] [Indexed: 01/09/2023] Open
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Shraberg J, Rick SW, Rannulu N, Cole RB. A study of procyanidin binding to Histatin 5 using Electrospray Ionization Tandem Mass Spectrometry (ESI-MS/MS) and molecular simulations. Phys Chem Chem Phys 2016; 17:12247-58. [PMID: 25893227 DOI: 10.1039/c4cp05586a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Tannins act as antioxidants, anticarcinogens, cardio-protectants, anti-inflammatory and anti-microbial agents and bind to salivary peptides by hydrophilic and hydrophobic mechanisms. Electrospray Ionization Mass Spectrometry (ESI-MS) has been used to assess both hydrophilic and hydrophobic components of noncovalent binding in protein complexes. In the present study, direct infusion Electrospray-Fourier Transform Ion Cyclotron Resonance Mass Spectrometry (ES-FTICR MS) is used to assess relative binding affinities of procyanidin tannin stereoisomers for salivary peptides arising from aqueous solutions. The condensed tannins procyanidin B1, B2, B3, and B4 demonstrate significantly different binding affinities for the salivary peptide Histatin 5. Rigid docking combined with molecular dynamics optimization is used to investigate procyanidin-Histatin 5 binding mechanisms and as a basis to rationalize trends found in the corresponding ES-FTICR MS experiments. The relative binding affinities of the four procyanidin rotamers are different in the gas and liquid phases. The simulation results indicate that many of the same contact points are made in both phases, but there is a increase in strong electrostatic interactions and an decrease in π-π contacts upon transfer from the liquid to the gas phase. The simulations reveal that the tannin interactions can make close contacts with a variety of amino acid residues on the peptide.
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Affiliation(s)
- Joshua Shraberg
- Department of Chemistry, University of New Orleans, New Orleans, LA 70148, USA.
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Liu Z, Nakamura T, Munemasa S, Murata Y, Nakamura Y. Galloylated Catechins as Potent Inhibitors of Angiotensin Converting Enzyme. FOOD SCIENCE AND TECHNOLOGY RESEARCH 2016. [DOI: 10.3136/fstr.22.847] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Zhe Liu
- Graduate School of Environmental and Life Science, Okayama University
| | | | - Shintaro Munemasa
- Graduate School of Environmental and Life Science, Okayama University
| | - Yoshiyuki Murata
- Graduate School of Environmental and Life Science, Okayama University
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Quinopeptide formation associated with the disruptive effect of epigallocatechin-gallate on lysozyme fibrils. Int J Biol Macromol 2015; 78:389-95. [DOI: 10.1016/j.ijbiomac.2015.04.031] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2014] [Revised: 04/02/2015] [Accepted: 04/20/2015] [Indexed: 02/05/2023]
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Cyboran S, Strugała P, Włoch A, Oszmiański J, Kleszczyńska H. Concentrated green tea supplement: biological activity and molecular mechanisms. Life Sci 2015; 126:1-9. [PMID: 25703070 DOI: 10.1016/j.lfs.2014.12.025] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2014] [Revised: 11/05/2014] [Accepted: 12/17/2014] [Indexed: 01/18/2023]
Abstract
AIM This study was undertaken to determine the biological activity of a green tea supplement with respect to cells and erythrocyte membranes and the molecular mechanism of that activity. MAIN METHODS The extract's activity was evaluated on the basis of its hemolytic, antioxidant and antiinflammatory actions. In addition, the extract's effect on the physical properties of the erythrocyte membrane was examined. We also conducted a detailed analysis of supplement ingredients using high-yield liquid chromatography, supplemented with standard tests of total content of polyphenols and flavonoids in the supplement. KEY FINDINGS The study showed that green tea extract has a high antioxidant and anti-inflammatory capacity with no deleterious effect on red blood cells. The extract modifies the physical properties of the erythrocyte membrane, apparently by binding to its hydrophilic region, with consequent rigidity of the hydrophobic region, increased hydration and a moderate increase in its resistance to changes in tonicity of the medium. Because the extract's components anchor in the polar region of membrane lipids, they are able to effectively scavenge free radicals in the immediate vicinity of the membrane and hinder their diffusion into its interior. SIGNIFICANCE Green tea supplement at concentrations markedly exceeding the blood plasma physiological polyphenol concentrations has no destructive effect on the erythrocyte membrane. Due to the high content of flavan-3-ols, the supplement exhibits high biological activity, which makes it an alternative source of those substances to the commonly used infusion of green tea leaves.
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Affiliation(s)
- S Cyboran
- Department of Physics and Biophysics, Wrocław University of Environmental and Life Sciences, Norwida 25, 50-375 Wrocław, Poland.
| | - P Strugała
- Department of Physics and Biophysics, Wrocław University of Environmental and Life Sciences, Norwida 25, 50-375 Wrocław, Poland
| | - A Włoch
- Department of Physics and Biophysics, Wrocław University of Environmental and Life Sciences, Norwida 25, 50-375 Wrocław, Poland
| | - J Oszmiański
- Department of Fruit, Vegetable and Cereal Technology, Wrocław University of Environmental and Life Sciences, Norwida 25, 50-375 Wrocław, Poland
| | - H Kleszczyńska
- Department of Physics and Biophysics, Wrocław University of Environmental and Life Sciences, Norwida 25, 50-375 Wrocław, Poland
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Gundimeda U, McNeill TH, Barseghian BA, Tzeng WS, Rayudu DV, Cadenas E, Gopalakrishna R. Polyphenols from green tea prevent antineuritogenic action of Nogo-A via 67-kDa laminin receptor and hydrogen peroxide. J Neurochem 2015; 132:70-84. [PMID: 25314656 DOI: 10.1111/jnc.12964] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2014] [Revised: 08/22/2014] [Accepted: 10/06/2014] [Indexed: 02/02/2023]
Abstract
Axonal regeneration after injury to the CNS is hampered by myelin-derived inhibitors, such as Nogo-A. Natural products, such as green tea, which are neuroprotective and safe for long-term therapy, would complement ongoing various pharmacological approaches. In this study, using nerve growth factor-differentiated neuronal-like Neuroscreen-1 cells, we show that extremely low concentrations of unfractionated green tea polyphenol mixture (GTPP) and its active ingredient, epigallocatechin-3-gallate (EGCG), prevent both the neurite outgrowth-inhibiting activity and growth cone-collapsing activity of Nogo-66 (C-terminal domain of Nogo-A). Furthermore, a synergistic interaction was observed among GTPP constituents. This preventive effect was dependent on 67-kDa laminin receptor (67LR) to which EGCG binds with high affinity. The antioxidants N-acetylcysteine and cell-permeable catalase abolished this preventive effect of GTPP and EGCG, suggesting the involvement of sublethal levels of H2 O2 in this process. Accordingly, exogenous sublethal concentrations of H2 O2 , added as a bolus dose (5 μM) or more effectively through a steady-state generation (1-2 μM), mimicked GTPP in counteracting the action of Nogo-66. Exogenous H2 O2 mediated this action by bypassing the requirement of 67LR. Taken together, these results show for the first time that GTPP and EGCG, acting through 67LR and elevating intracellular sublethal levels of H2 O2 , inhibit the antineuritogenic action of Nogo-A. Currently, several agents are being evaluated for overcoming axonal growth inhibitors to promote functional recovery after stroke and spinal cord injury. Epigallocatechin-3-gallate (EGCG), present in green tea polyphenol mixture (GTPP), prevents antineuritogenic activity of Nogo-A, a myelin-derived axonal growth inhibitor. The preventive action of EGCG involves the cell-surface-associated 67-kDa laminin receptor and H2 O2 . GTPP may complement ongoing efforts to treat neuronal injuries.>
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Affiliation(s)
- Usha Gundimeda
- Department of Cell and Neurobiology, Keck School of Medicine, University of Southern California, Los Angeles, California, USA
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Liao CY, Lee CL, Wang HC, Liang SS, Kung PH, Wu YC, Chang FR, Wu CC. CLL2-1, a chemical derivative of orchid 1,4-phenanthrenequinones, inhibits human platelet aggregation through thiol modification of calcium-diacylglycerol guanine nucleotide exchange factor-I (CalDAG-GEFI). Free Radic Biol Med 2015; 78:101-10. [PMID: 25451646 DOI: 10.1016/j.freeradbiomed.2014.10.512] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/31/2014] [Revised: 10/14/2014] [Accepted: 10/14/2014] [Indexed: 11/29/2022]
Abstract
CalDAG-GEFI is a guanine nucleotide exchange factor, which actives small GTPase Rap1 and plays an important role in platelet aggregation. Our previous study has shown that CalDAG-GEFI contains redox-sensitive thiols, and its function can be inhibited by thiol modification. In the present study, the effect of CLL2-1, a 1,4-phenanthrenequinone, on CalDAG-GEFI and platelet functions was investigated. In human platelets, CLL2-1 prevented platelet aggregation caused by various stimulators. Flow cytometric analysis revealed that CLL2-1 inhibited GPIIb/IIIa activation and P-selectin secretion. Moreover, CLL2-1 prevented Rap1 activation caused by thrombin, the Ca(2+) ionophore A23187, and the diacylglycerol mimetic phorbol 12-myristate 13-acetate, while only slightly inhibited thrombin-induced increases in [Ca(2+)]i and did not inhibit protein kinase C activation. Western blots after reducing SDS-PAGE showed that treatment of either platelets or platelet lysates with CLL2-1 led to a decrease of monomeric CalDAG-GEFI and appearance of cross-linked oligomers of CalDAG-GEFI, and these effects were inhibited by pretreatment of platelets or lysates with thiol reducing agents prior to the addition of CLL2-1, indicating thiol modification of CalDAG-GEFI by CLL2-1. Furthermore, the thiol reducing agents also prevented the inhibitory effect of CLL2-1 on Rap1 activation, GPIIb/IIIa activation, and platelet aggregation. In CalDAG-GEFI-overexpressing human embryonic kidney 293T cells, CLL2-1 also inhibited CalDAG-GEFI-mediated Rap1 activation. Taken together, our results suggest that the antiplatelet effect of CLL2-1 is due to, at least in part, inhibition of CalDAG-GEFI-mediated Rap1 activation, and provide the basis for development of novel antiplatelet drugs.
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Affiliation(s)
- Chieh-Yu Liao
- Graduate Institute of Natural Products, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Chia-Lin Lee
- School of Pharmacy, College of Pharmacy, China Medical University, Taichung, Taiwan
| | - Hui-Chun Wang
- Graduate Institute of Natural Products, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Shih-Shin Liang
- Department of Biotechnology, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Po-Hsiung Kung
- Graduate Institute of Natural Products, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Yang-Chang Wu
- School of Pharmacy, College of Pharmacy, China Medical University, Taichung, Taiwan
| | - Fang-Rong Chang
- Graduate Institute of Natural Products, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Chin-Chung Wu
- Graduate Institute of Natural Products, Kaohsiung Medical University, Kaohsiung, Taiwan; Department of Marine Biotechnology and Resources, National Sun Yat-Sen University, Kaohsiung, Taiwan.
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Tea Polyphenols in Parkinson’s Disease. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2015; 863:117-37. [DOI: 10.1007/978-3-319-18365-7_6] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Wang A, Zhou K, Qi X, Zhao G. Phytoferritin association induced by EGCG inhibits protein degradation by proteases. PLANT FOODS FOR HUMAN NUTRITION (DORDRECHT, NETHERLANDS) 2014; 69:386-391. [PMID: 25384342 DOI: 10.1007/s11130-014-0451-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Phytoferritin is a promising resource of non-heme iron supplementation, but it is not stable against degradation by proteases in the gastrointestinal tract. Therefore, how to improve the stability of ferritin in the presence of proteases is a challenge. Since (-)-epigallocatechin-3-gallate (EGCG) is rich in phenolic-hydroxyl groups, it could interact with ferritin through hydrogen bonds, thereby preventing protein from degradation. To confirm this idea, we focus on the interaction between EGCG and phytoferritin, and the consequence of such interaction. Results demonstrated that EGCG did interact with ferritin, and such interaction induced the change in the tertiary/quaternary structure of protein but not in its secondary structure. Furthermore, stopped-flow and dynamic light scattering (DLS) results showed that EGCG could trigger ferritin association. Consequently, such protein association markedly inhibited protein digestion by pepsin at pH 4.0 and by trypsin at pH 7.5. These findings raise the possibility to improve the stability of phytoferritin in the presence of proteases.
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Affiliation(s)
- Aidong Wang
- CAU & ACC Joint-Laboratory of Space Food College of Food Science and Nutritional Engineering Key Laboratory of Functional Dairy Ministry of Education, China Agricultural University, Beijing, 100083, China
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Cyboran S, Bonarska-Kujawa D, Pruchnik H, Żyłka R, Oszmiański J, Kleszczyńska H. Phenolic content and biological activity of extracts of blackcurrant fruit and leaves. Food Res Int 2014. [DOI: 10.1016/j.foodres.2014.05.037] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Zhao L, Li W, Zhu S, Tsai S, Li J, Tracey KJ, Wang P, Fan S, Sama AE, Wang H. Green tea catechins quench the fluorescence of bacteria-conjugated Alexa fluor dyes. ACTA ACUST UNITED AC 2014; 12:308-14. [PMID: 24011199 PMCID: PMC3796893 DOI: 10.2174/18715281113129990057] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2013] [Revised: 08/07/2013] [Accepted: 08/08/2013] [Indexed: 01/06/2023]
Abstract
Accumulating evidence suggests that Green tea polyphenolic catechins, especially the (-)-epigallocatechin gallate (EGCG), can be cross-linked to many proteins, and confer a wide range of anti-bacterial activities possibly by damaging microbial cytoplasmic lipids and proteins. At the doses that conferred protection against lethal polymicrobial infection (induced by cecal ligation and puncture), EGCG significantly reduced bacterial loads particularly in the liver and lung. To elucidate its bactericidal mechanisms, we determined whether EGCG affected the fluorescence intensities of bacteria-conjugated Alexa Fluor 488 or 594 dyes. When mixed with unconjugated Alexa Fluor 488 or 594 dyes, EGCG or analogs did not affect the fluorescence intensity of these dyes. In a sharp contrast, EGCG and some analogs (e.g., Catechin Gallate, CG), markedly reduced the fluorescence intensity of Gram-positive Staphylococcus aureus-conjugated Alexa 594 and Gram-negative Escherichia coli-conjugated Alexa 488. Interestingly, co-treatment with ethanol impaired the EGCG-mediated fluorescence quenching of the G(+) S. aureus, but not of the G(-) E. coli-conjugated Alexa Flour dyes. In light of the notion that Alexa Fluor dyes can be quenched by aromatic amino acids, it is plausible that EGCG exerts antimicrobial activities possibly by altering microbial protein conformations and functions. This possibility can now be explored by screening other fluorescence-quenching agents for possible antimicrobial activities.
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Affiliation(s)
- Lin Zhao
- Department of Emergency Medicine, North Shore University Hospital, 350 Community Drive, Manhasset, NY 11030, USA.
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Tarahovsky YS, Kim YA, Yagolnik EA, Muzafarov EN. Flavonoid-membrane interactions: involvement of flavonoid-metal complexes in raft signaling. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2014; 1838:1235-46. [PMID: 24472512 DOI: 10.1016/j.bbamem.2014.01.021] [Citation(s) in RCA: 101] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2013] [Revised: 01/13/2014] [Accepted: 01/17/2014] [Indexed: 02/07/2023]
Abstract
Flavonoids are polyphenolic compounds produced by plants and delivered to the human body through food. Although the epidemiological analyses of large human populations did not reveal a simple correlation between flavonoid consumption and health, laboratory investigations and clinical trials clearly demonstrate the effectiveness of flavonoids in the prevention of cardiovascular, carcinogenic, neurodegenerative and immune diseases, as well as other diseases. At present, the abilities of flavonoids in the regulation of cell metabolism, gene expression, and protection against oxidative stress are well-known, although certain biophysical aspects of their functioning are not yet clear. Most flavonoids are poorly soluble in water and, similar to lipophilic compounds, have a tendency to accumulate in biological membranes, particularly in lipid rafts, where they can interact with different receptors and signal transducers and influence their functioning through modulation of the lipid-phase behavior. In this study, we discuss the enhancement in the lipophilicity and antioxidative activity of flavonoids after their complexation with transient metal cations. We hypothesize that flavonoid-metal complexes are involved in the formation of molecular assemblies due to the facilitation of membrane adhesion and fusion, protein-protein and protein-membrane binding, and other processes responsible for the regulation of cell metabolism and protection against environmental hazards.
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Affiliation(s)
- Yury S Tarahovsky
- Institute of Theoretical and Experimental Biophysics, RAS, Pushchino, Moscow Region 142290, Russia.
| | - Yuri A Kim
- Institute of Cell Biophysics, RAS, Pushchino, Moscow Region 142290, Russia
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