1
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Mercury Chloride Affects Band 3 Protein-Mediated Anionic Transport in Red Blood Cells: Role of Oxidative Stress and Protective Effect of Olive Oil Polyphenols. Cells 2023; 12:cells12030424. [PMID: 36766766 PMCID: PMC9913727 DOI: 10.3390/cells12030424] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2022] [Revised: 01/19/2023] [Accepted: 01/25/2023] [Indexed: 01/31/2023] Open
Abstract
Mercury is a toxic heavy metal widely dispersed in the natural environment. Mercury exposure induces an increase in oxidative stress in red blood cells (RBCs) through the production of reactive species and alteration of the endogenous antioxidant defense system. Recently, among various natural antioxidants, the polyphenols from extra-virgin olive oil (EVOO), an important element of the Mediterranean diet, have generated growing interest. Here, we examined the potential protective effects of hydroxytyrosol (HT) and/or homovanillyl alcohol (HVA) on an oxidative stress model represented by human RBCs treated with HgCl2 (10 µM, 4 h of incubation). Morphological changes as well as markers of oxidative stress, including thiobarbituric acid reactive substance (TBARS) levels, the oxidation of protein sulfhydryl (-SH) groups, methemoglobin formation (% MetHb), apoptotic cells, a reduced glutathione/oxidized glutathione ratio, Band 3 protein (B3p) content, and anion exchange capability through B3p were analyzed in RBCs treated with HgCl2 with or without 10 μM HT and/or HVA pre-treatment for 15 min. Our data show that 10 µM HT and/or HVA pre-incubation impaired both acanthocytes formation, due to 10 µM HgCl2, and mercury-induced oxidative stress injury and, moreover, restored the endogenous antioxidant system. Interestingly, HgCl2 treatment was associated with a decrease in the rate constant for SO42- uptake through B3p as well as MetHb formation. Both alterations were attenuated by pre-treatment with HT and/or HVA. These findings provide mechanistic insights into benefits deriving from the use of naturally occurring polyphenols against oxidative stress induced by HgCl2 on RBCs. Thus, dietary supplementation with polyphenols might be useful in populations exposed to HgCl2 poisoning.
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2
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Amigo L, Martínez-Maqueda D, Hernández-Ledesma B. In Silico and In Vitro Analysis of Multifunctionality of Animal Food-Derived Peptides. Foods 2020; 9:foods9080991. [PMID: 32722144 PMCID: PMC7466261 DOI: 10.3390/foods9080991] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Revised: 07/19/2020] [Accepted: 07/21/2020] [Indexed: 12/12/2022] Open
Abstract
Currently, the associations between oxidative stress, inflammation, hypertension, and metabolic disturbances and non-communicable diseases are very well known. Since these risk factors show a preventable character, the searching of food peptides acting against them has become a promising strategy for the design and development of new multifunctional foods or nutraceuticals. In the present study, an integrated approach combining an in silico study and in vitro assays was used to confirm the multifunctionality of milk and meat protein-derived peptides that were similar to or shared amino acids with previously described opioid peptides. By the in silico analysis, 15 of the 27 assayed peptides were found to exert two or more activities, with Angiotensin-converting enzyme (ACE) inhibitory, antioxidant, and opioid being the most commonly found. The in vitro study confirmed ACE-inhibitory and antioxidant activities in 15 and 26 of the 27 synthetic peptides, respectively. Four fragments, RYLGYLE, YLGYLE, YFYPEL, and YPWT, also demonstrated the ability to protect Caco-2 and macrophages RAW264.7 cells from the oxidative damage caused by chemicals. The multifunctionality of these peptides makes them promising agents against oxidative stress-associated diseases.
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Affiliation(s)
- Lourdes Amigo
- Departamento de Bioactividad y Análisis de Alimentos, Instituto de Investigación en Ciencias de la Alimentación (CIAL, CSIC-UAM, CEI-UAM+CSIC), Nicolás Cabrera 9, 28049 Madrid, Spain;
| | - Daniel Martínez-Maqueda
- Departamento de Investigación Agroalimentaria, Instituto Madrileño de Investigación y Desarrollo Rural, Agrario y Alimentario (IMIDRA), 28800 Madrid, Spain;
| | - Blanca Hernández-Ledesma
- Departamento de Bioactividad y Análisis de Alimentos, Instituto de Investigación en Ciencias de la Alimentación (CIAL, CSIC-UAM, CEI-UAM+CSIC), Nicolás Cabrera 9, 28049 Madrid, Spain;
- Correspondence: ; Tel.: +34-001-70-970
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3
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Diallinas G, Rafailidou N, Kalpaktsi I, Komianou AC, Tsouvali V, Zantza I, Mikros E, Skaltsounis AL, Kostakis IK. Hydroxytyrosol (HT) Analogs Act as Potent Antifungals by Direct Disruption of the Fungal Cell Membrane. Front Microbiol 2018; 9:2624. [PMID: 30459736 PMCID: PMC6232300 DOI: 10.3389/fmicb.2018.02624] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2018] [Accepted: 10/15/2018] [Indexed: 12/31/2022] Open
Abstract
Fungal infections constitute an emerging threat and a prevalent health problem due to increasing number of immunocompromised people and pharmacological or other treatments aiming at viral infections, cancer or allergies. Currently used antifungals suffer from inefficiency, toxic side effects and developing drug-resistance. Additionally, over the last two decades no new classes of antifungals have been approved, emphasizing the urgent need for developing a novel generation of antifungals. Here, we investigate the antifungal activity of a series of chemically synthesized Hydroxytyrosol (HT) analogs. HT is one of the major phenolic compounds in olive oil, shown to possess radical-scavenging antioxidant, antiproliferative, proapoptotic and anti-inflammatory activities. No previous report has studied HT analogs as antifungals. We show that specific analogs have broad and strong antifungal activity, significantly stronger than the parent compound HT. Using Aspergillus nidulans as an in vivo cellular model system, we show that antifungal HT analogs have an unprecedented efficiency in fungal plasma membrane destruction. Importantly, antifungal HT analogs did not show toxicity in a mammalian cell line, whereas no resistance to HT analogs was obtained by standard mutagenesis. Our results open the way for the development of a novel, efficient and safer class of antifungals.
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Affiliation(s)
- George Diallinas
- Department of Biology, National and Kapodistrian University of Athens, Athens, Greece
| | - Nausica Rafailidou
- Department of Biology, National and Kapodistrian University of Athens, Athens, Greece
| | - Ioanna Kalpaktsi
- Department of Pharmacy, National and Kapodistrian University of Athens, Athens, Greece
| | | | - Vivian Tsouvali
- Department of Biology, National and Kapodistrian University of Athens, Athens, Greece
| | - Iliana Zantza
- Department of Pharmacy, National and Kapodistrian University of Athens, Athens, Greece
| | - Emmanuel Mikros
- Department of Pharmacy, National and Kapodistrian University of Athens, Athens, Greece
| | | | - Ioannis K Kostakis
- Department of Pharmacy, National and Kapodistrian University of Athens, Athens, Greece
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4
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Comparative Analysis of the Effects of Olive Oil Hydroxytyrosol and Its 5- S-Lipoyl Conjugate in Protecting Human Erythrocytes from Mercury Toxicity. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2018; 2018:9042192. [PMID: 29849921 PMCID: PMC5924984 DOI: 10.1155/2018/9042192] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/20/2017] [Accepted: 03/04/2018] [Indexed: 12/20/2022]
Abstract
Oxidative stress is one of the underlying mechanisms of the toxic effects exerted by mercury (Hg) on human health. Several antioxidant compounds, including the olive oil phenol hydroxytyrosol (HT), were investigated for their protective action. Recently, we have reported that 5-S-lipoylhydroxytyrosol (Lipo-HT) has shown increased antioxidant activities compared to HT and exerted potent protective effects against reactive oxygen species (ROS) generation and oxidative damage in human hepatocellular carcinoma HepG2 cell lines. In this study, the effects of Lipo-HT and HT on oxidative alterations of human erythrocytes induced by exposure to 40 μM HgCl2 were comparatively evaluated. When administered to the cells, Lipo-HT (5–20 μM) proved nontoxic and it decreased the Hg-induced generation of ROS, the hemolysis, and the depletion of intracellular GSH levels. At all tested concentrations, Lipo-HT exhibited higher ability to counteract Hg-induced cytotoxicity compared to HT. Model studies indicated the formation of a mercury complex at the SH group of Lipo-HT followed by a redox reaction that would spare intracellular GSH. Thus, the enhanced erythrocyte protective action of Lipo-HT from Hg-induced damage with respect to HT is likely due to an effective chelating and reducing ability toward mercury ions. These findings encourage the use of Lipo-HT in nutraceutical strategies to contrast heavy metal toxicity in humans.
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5
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Kitsati N, Mantzaris MD, Galaris D. Hydroxytyrosol inhibits hydrogen peroxide-induced apoptotic signaling via labile iron chelation. Redox Biol 2016; 10:233-242. [PMID: 27810738 PMCID: PMC5094689 DOI: 10.1016/j.redox.2016.10.006] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2016] [Revised: 10/03/2016] [Accepted: 10/11/2016] [Indexed: 11/27/2022] Open
Abstract
Although it is known that Mediterranean diet plays an important role in maintaining human health, the underlying molecular mechanisms remain largely unknown. The aim of this investigation was to elucidate the potential role of ortho-dihydroxy group containing natural compounds in H2O2-induced DNA damage and apoptosis. For this purpose, the main phenolic alcohols of olive oil, namely hydroxytyrosol and tyrosol, were examined for their ability to protect cultured cells under conditions of oxidative stress. A strong correlation was observed between the ability of hydroxytyrosol to mitigate intracellular labile iron level and the protection offered against H2O2-induced DNA damage and apoptosis. On the other hand, tyrosol, which lacks the ortho-dihydroxy group, was ineffective. Moreover, hydroxytyrosol (but not tyrosol), was able to diminish the late sustained phase of H2O2-induced JNK and p38 phosphorylation. The derangement of intracellular iron homeostasis, following exposure of cells to H2O2, played pivotal role both in the induction of DNA damage and the initiation of apoptotic signaling. The presented results suggest that the protective effects exerted by ortho-dihydroxy group containing dietary compounds against oxidative stress-induced cell damage are linked to their ability to influence changes in the intracellular labile iron homeostasis. The ortho-dihydroxy moiety is essential for the protective action of polyphenols. Hydroxytyrosol protects cell constituents by mitigating intracellular labile iron. Hydroxytyrosol diminishes H2O2-induced JNK and p38 phosphorylation.
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Affiliation(s)
- Natalia Kitsati
- Laboratory of Biological Chemistry, University of Ioannina, School of Health Sciences, Faculty of Medicine, 451 10 Ioannina, Greece
| | - Michalis D Mantzaris
- Laboratory of Biological Chemistry, University of Ioannina, School of Health Sciences, Faculty of Medicine, 451 10 Ioannina, Greece
| | - Dimitrios Galaris
- Laboratory of Biological Chemistry, University of Ioannina, School of Health Sciences, Faculty of Medicine, 451 10 Ioannina, Greece.
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6
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Nenadis N, Siskos D. Radical scavenging activity characterization of synthetic isochroman-derivatives of hydroxytyrosol: A gas-phase DFT approach. Food Res Int 2015; 76:506-510. [DOI: 10.1016/j.foodres.2015.06.040] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2015] [Revised: 06/17/2015] [Accepted: 06/23/2015] [Indexed: 10/23/2022]
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7
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Bernini R, Gilardini Montani MS, Merendino N, Romani A, Velotti F. Hydroxytyrosol-Derived Compounds: A Basis for the Creation of New Pharmacological Agents for Cancer Prevention and Therapy. J Med Chem 2015. [DOI: 10.1021/acs.jmedchem.5b00669] [Citation(s) in RCA: 69] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Roberta Bernini
- Department
of Agriculture, Nature, Forests and Energy (DAFNE), Tuscia University, Via
S. Camillo De Lellis, 01100 Viterbo, Italy
| | | | - Nicolò Merendino
- Department
of Ecological and Biological Sciences (DEB), Tuscia University, 01100 Viterbo, Italy
| | - Annalisa Romani
- PHYTOLAB
(Pharmaceutical, Cosmetic, Food Supplement Technology and Analysis)—DISIA, University of Florence, 50134 Florence, Italy
| | - Francesca Velotti
- Department
of Ecological and Biological Sciences (DEB), Tuscia University, 01100 Viterbo, Italy
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8
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The Toluene o-Xylene Monooxygenase Enzymatic Activity for the Biosynthesis of Aromatic Antioxidants. PLoS One 2015; 10:e0124427. [PMID: 25915063 PMCID: PMC4411060 DOI: 10.1371/journal.pone.0124427] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2014] [Accepted: 03/13/2015] [Indexed: 01/06/2023] Open
Abstract
Monocyclic phenols and catechols are important antioxidant compounds for the food and pharmaceutic industries; their production through biotransformation of low-added value starting compounds is of major biotechnological interest. The toluene o-xylene monooxygenase (ToMO) from Pseudomonas sp. OX1 is a bacterial multicomponent monooxygenase (BMM) that is able to hydroxylate a wide array of aromatic compounds and has already proven to be a versatile biochemical tool to produce mono- and dihydroxylated derivatives of aromatic compounds. The molecular determinants of its regioselectivity and substrate specificity have been thoroughly investigated, and a computational strategy has been developed which allows designing mutants able to hydroxylate non-natural substrates of this enzyme to obtain high-added value compounds of commercial interest. In this work, we have investigated the use of recombinant ToMO, expressed in cells of Escherichia coli strain JM109, for the biotransformation of non-natural substrates of this enzyme such as 2-phenoxyethanol, phthalan and 2-indanol to produce six hydroxylated derivatives. The hydroxylated products obtained were identified, isolated and their antioxidant potential was assessed both in vitro, using the DPPH assay, and on the rat cardiomyoblast cell line H9c2. Incubation of H9c2 cells with the hydroxylated compounds obtained from ToMO-catalyzed biotransformation induced a differential protective effect towards a mild oxidative stress induced by the presence of sodium arsenite. The results obtained confirm once again the versatility of the ToMO system for oxyfunctionalization reactions of biotechnological importance. Moreover, the hydroxylated derivatives obtained possess an interesting antioxidant potential that encourages the use of the enzyme for further functionalization reactions and their possible use as scaffolds to design novel bioactive molecules.
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9
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García-Nebot MJ, Recio I, Hernández-Ledesma B. Antioxidant activity and protective effects of peptide lunasin against oxidative stress in intestinal Caco-2 cells. Food Chem Toxicol 2014; 65:155-61. [DOI: 10.1016/j.fct.2013.12.021] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2013] [Revised: 12/05/2013] [Accepted: 12/16/2013] [Indexed: 10/25/2022]
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10
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Malheiro R, Mendes P, Fernandes F, Rodrigues N, Bento A, Pereira JA. Bioactivity and phenolic composition from natural fermented table olives. Food Funct 2014; 5:3132-42. [DOI: 10.1039/c4fo00560k] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Natural fermented table olives as a source of phytochemicals with bioactive properties.
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Affiliation(s)
- Ricardo Malheiro
- Mountain Research Centre (CIMO)
- School of Agriculture
- Polytechnic Institute of Bragança
- 5301-855 Bragança, Portugal
- REQUIMTE/Laboratório de Bromatologia e Hidrologia
| | - Patrícia Mendes
- Mountain Research Centre (CIMO)
- School of Agriculture
- Polytechnic Institute of Bragança
- 5301-855 Bragança, Portugal
| | - Fátima Fernandes
- Mountain Research Centre (CIMO)
- School of Agriculture
- Polytechnic Institute of Bragança
- 5301-855 Bragança, Portugal
| | - Nuno Rodrigues
- Mountain Research Centre (CIMO)
- School of Agriculture
- Polytechnic Institute of Bragança
- 5301-855 Bragança, Portugal
| | - Albino Bento
- Mountain Research Centre (CIMO)
- School of Agriculture
- Polytechnic Institute of Bragança
- 5301-855 Bragança, Portugal
| | - José Alberto Pereira
- Mountain Research Centre (CIMO)
- School of Agriculture
- Polytechnic Institute of Bragança
- 5301-855 Bragança, Portugal
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11
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Treatment of olive mill wastewater by membrane distillation using polytetrafluoroethylene membranes. Sep Purif Technol 2012. [DOI: 10.1016/j.seppur.2012.06.026] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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12
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Scoma A, Bertin L, Zanaroli G, Fraraccio S, Fava F. A physicochemical-biotechnological approach for an integrated valorization of olive mill wastewater. BIORESOURCE TECHNOLOGY 2011; 102:10273-10279. [PMID: 21924896 DOI: 10.1016/j.biortech.2011.08.080] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2011] [Revised: 08/16/2011] [Accepted: 08/19/2011] [Indexed: 05/31/2023]
Abstract
An integrated physicochemical-biotechnological approach for a multipurpose valorization of olive mill wastewaters was studied. More than 60% of the wastewater natural polyphenols were recovered through a solid phase extraction procedure, by employing Amberlite XAD16 resin as the adsorbent and ethanol as the biocompatible desorbing phase. Thereafter, the dephenolized effluent was fed to a mesophilic anaerobic acidogenic packed-bed biofilm reactor for the bioconversion of the organic leftover into volatile fatty acids (VFAs). A VFAs concentration of 19 gCODL(-1) was obtained, representing more than 70% of the COD occurring in the anaerobic effluent. The biotechnological process was assessed by means of bio-molecular analyses, which showed that the reactor packed bed was mostly colonized by bacteria of the Firmicutes phylogenetic group. The biorefinery scheme developed in this study allowed the obtainment of 1.59 g of polyphenols per liter of wastewater treated and 2.72 gCODL(-1) day(-1) of VFAs.
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Affiliation(s)
- Alberto Scoma
- Department of Civil, Environmental and Materials Engineering (DICAM), Unit of Environmental Biotechnology and Biorefineries, Faculty of Engineering, University of Bologna, via Terracini 28, 40131 Bologna, Italy.
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13
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Notomista E, Scognamiglio R, Troncone L, Donadio G, Pezzella A, Di Donato A, Izzo V. Tuning the specificity of the recombinant multicomponent toluene o-xylene monooxygenase from Pseudomonas sp. strain OX1 for the biosynthesis of tyrosol from 2-phenylethanol. Appl Environ Microbiol 2011; 77:5428-37. [PMID: 21666013 PMCID: PMC3147462 DOI: 10.1128/aem.00461-11] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2011] [Accepted: 06/01/2011] [Indexed: 12/27/2022] Open
Abstract
Biocatalysis is today a standard technology for the industrial production of several chemicals, and the number of biotransformation processes running on a commercial scale is constantly increasing. Among biocatalysts, bacterial multicomponent monooxygenases (BMMs), a diverse group of nonheme diiron enzymes that activate dioxygen, are of primary interest due to their ability to catalyze a variety of complex oxidations, including reactions of mono- and dihydroxylation of phenolic compounds. In recent years, both directed evolution and rational design have been successfully used to identify the molecular determinants responsible for BMM regioselectivity and to improve their activity toward natural and nonnatural substrates. Toluene o-xylene monooxygenase (ToMO) is a BMM isolated from Pseudomonas sp. strain OX1 which hydroxylates a wide spectrum of aromatic compounds. In this work we investigate the use of recombinant ToMO for the biosynthesis in recombinant cells of Escherichia coli strain JM109 of 4-hydroxyphenylethanol (tyrosol), an antioxidant present in olive oil, from 2-phenylethanol, a cheap and commercially available substrate. We initially found that wild-type ToMO is unable to convert 2-phenylethanol to tyrosol. This was explained by using a computational model which analyzed the interactions between ToMO active-site residues and the substrate. We found that residue F176 is the major steric hindrance for the correct positioning of the reaction intermediate leading to tyrosol production into the active site of the enzyme. Several mutants were designed and prepared, and we found that the combination of different mutations at position F176 with mutation E103G allows ToMO to convert up to 50% of 2-phenylethanol into tyrosol in 2 h.
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Affiliation(s)
- Eugenio Notomista
- Dipartimento di Biologia Strutturale e Funzionale, Università di Napoli Federico II, Via Cinthia, I-80126 Naples, and CEINGE-Biotecnologie Avanzate s.c.ar.l., Naples, Italy
| | - Roberta Scognamiglio
- Dipartimento di Biologia Strutturale e Funzionale, Università di Napoli Federico II, Via Cinthia, I-80126 Naples, and CEINGE-Biotecnologie Avanzate s.c.ar.l., Naples, Italy
| | - Luca Troncone
- Dipartimento di Biologia Strutturale e Funzionale, Università di Napoli Federico II, Via Cinthia, I-80126 Naples, and CEINGE-Biotecnologie Avanzate s.c.ar.l., Naples, Italy
| | - Giuliana Donadio
- Dipartimento di Biologia Strutturale e Funzionale, Università di Napoli Federico II, Via Cinthia, I-80126 Naples, and CEINGE-Biotecnologie Avanzate s.c.ar.l., Naples, Italy
| | - Alessandro Pezzella
- Dipartimento di Chimica Organica e Biochimica, Università di Napoli Federico II, Via Cinthia, 80126 Naples, Italy
| | - Alberto Di Donato
- Dipartimento di Biologia Strutturale e Funzionale, Università di Napoli Federico II, Via Cinthia, I-80126 Naples, and CEINGE-Biotecnologie Avanzate s.c.ar.l., Naples, Italy
| | - Viviana Izzo
- Dipartimento di Biologia Strutturale e Funzionale, Università di Napoli Federico II, Via Cinthia, I-80126 Naples, and CEINGE-Biotecnologie Avanzate s.c.ar.l., Naples, Italy
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14
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Protective effect of simple phenols from extravirgin olive oil against lipid peroxidation in intestinal Caco-2 cells. Food Chem Toxicol 2010; 48:3008-16. [DOI: 10.1016/j.fct.2010.07.041] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2010] [Revised: 07/27/2010] [Accepted: 07/28/2010] [Indexed: 11/19/2022]
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15
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Hydroxytyrosol Acyl Esters: Biosynthesis and Activities. Appl Biochem Biotechnol 2010; 163:592-9. [DOI: 10.1007/s12010-010-9065-2] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2010] [Accepted: 08/09/2010] [Indexed: 10/19/2022]
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16
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Bouaziz M, Feki I, Ayadi M, Jemai H, Sayadi S. Stability of refined olive oil and olive-pomace oil added by phenolic compounds from olive leaves. EUR J LIPID SCI TECH 2010. [DOI: 10.1002/ejlt.200900166] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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17
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Incani A, Deiana M, Corona G, Vafeiadou K, Vauzour D, Dessì MA, Spencer JPE. Involvement of ERK, Akt and JNK signalling in H2O2-induced cell injury and protection by hydroxytyrosol and its metabolite homovanillic alcohol. Mol Nutr Food Res 2009; 54:788-96. [DOI: 10.1002/mnfr.200900098] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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18
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19
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Dong C, Wang Y, Zhu YZ. Asymmetric synthesis and biological evaluation of Danshensu derivatives as anti-myocardial ischemia drug candidates. Bioorg Med Chem 2009; 17:3499-507. [DOI: 10.1016/j.bmc.2009.02.065] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2008] [Revised: 02/04/2009] [Accepted: 02/05/2009] [Indexed: 11/24/2022]
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20
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Bouaziz M, Lassoued S, Bouallagui Z, Smaoui S, Gargoubi A, Dhouib A, Sayadi S. Synthesis and recovery of high bioactive phenolics from table-olive brine process wastewater. Bioorg Med Chem 2008; 16:9238-46. [DOI: 10.1016/j.bmc.2008.09.012] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2008] [Revised: 09/04/2008] [Accepted: 09/05/2008] [Indexed: 11/28/2022]
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21
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Obied HK, Bedgood DR, Prenzler PD, Robards K. Effect of processing conditions, prestorage treatment, and storage conditions on the phenol content and antioxidant activity of olive mill waste. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2008; 56:3925-3932. [PMID: 18457398 DOI: 10.1021/jf703756d] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The impact of two- and three-phase processing systems and malaxation conditions on phenol content (both total and individual phenols) and antioxidant capacity of laboratory-generated olive mill waste (OMW) was assessed. Two-phase olive processing generated a waste with higher phenol content and antioxidant capacity. Using the two-phase system, both malaxation time and temperature affected the phenol content and antioxidant capacity. The effects of different prestorage drying treatments on phenol content and antioxidant capacity were also compared. Air drying and drying at 60 degrees C resulted in a substantial decrease in the phenol content and antioxidant capacity. Drying at 105 degrees C and freeze-drying produced less degradation. The phenol content and antioxidant capacity of OMW stored at 4 degrees C and of OMW preserved by 40% w/w ethanol and 1% w/w acetic acid and stored at 4 degrees C were monitored for 30 days and compared with those of OMW stored at room temperature. None of these storage conditions could prevent the rapid decrease in phenolic concentrations and antioxidant capacity, which happened within the first 24 h.
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Affiliation(s)
- Hassan K Obied
- E.H. Graham Centre for Agricultural Innovation, School of Biomedical Sciences, Charles Sturt University, Wgga Wagga, NSW, Australia.
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22
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Jemai H, Fki I, Bouaziz M, Bouallagui Z, El Feki A, Isoda H, Sayadi S. Lipid-lowering and antioxidant effects of hydroxytyrosol and its triacetylated derivative recovered from olive tree leaves in cholesterol-fed rats. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2008; 56:2630-2636. [PMID: 18380465 DOI: 10.1021/jf072589s] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
This study was designed to test the lipid-lowering and antioxidative activities of triacetylated hydroxytyrosol compared with its native compound, hydroxytyrosol, purified from olive tree leaves. Wistar rats fed a standard laboratory diet or a cholesterol-rich diet for 16 weeks were used. The serum lipid levels, the thiobarbituric acid-reactive substances (TBARS) level, as an indicator of lipid peroxidation, and the activity of superoxide dismutase (SOD) as well as that of catalase (CAT) were examined. The cholesterol-rich diet induced hypercholesterolemia that was manifested in the elevation of total cholesterol (TC), triglycerides (TG), and low-density lipoprotein cholesterol (LDL-C). Administration of hydroxytyrosol and triacetylated hydroxytyrosol (3 mg/kg of body weight) decreased the serum levels of TC, TG, and LDL-C significantly and increased the serum level of high-density lipoprotein cholesterol (HDL-C). Furthermore, the content of TBARS in liver, heart, kidney, and aorta decreased significantly when hydroxytyrosol and its triacetylated derivatives were orally administered to rats compared with those fed a cholesterol-rich diet. In addition, triacetylated hydroxytyrosol and hydroxytyrosol increased CAT and SOD activities in the liver. These results suggested that the hypolipidemic effect of triacetylated hydroxytyrosol and hydroxytyrosol might be due to their abilities to lower serum TC, TG, and LDL-C levels as well as to their antioxidant activities preventing the lipid peroxidation process.
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Affiliation(s)
- Hedya Jemai
- Laboratoire des Bioprocédés, Pôle d'Excellence Régional AUF, Centre de Biotechnologie de Sfax, B.P. K 3038 Sfax, Tunisia
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Bovicelli P, Antonioletti R, Mancini S, Causio S, Borioni G, Ammendola S, Barontini M. Expedient Synthesis of Hydroxytyrosol and its Esters. SYNTHETIC COMMUN 2007. [DOI: 10.1080/00397910701575509] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Capasso R, Sannino F, De Martino A, Manna C. Production of triacetylhydroxytyrosol from olive mill waste waters for use as stabilized bioantioxidant. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2006; 54:9063-70. [PMID: 17117791 DOI: 10.1021/jf061290r] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
A hydroxytyrosol triacetyl derivative was very efficiently produced as a highly pure stabilized antioxidant compound by a short treatment of olive mill waste water (OMWW) organic extracts, rich in hydroxytyrosol, with an acetylating mixture composed of HClO4-SiO2 and Ac2O (Chakborti and Gulhane reaction), in mild and safe conditions. A successive single step of middle pressure liquid chromatography (MPLC) purification of the reaction product was performed, with an overall yield of 35.6%. (This process, including both the Chakborti and Gulhane reaction and the MPLC purification, is protected by an international patent under PCT/IT2005/000781.) The o-diphenol triacetyl derivative was also produced by direct reaction of hydroxytyrosol, previously purified by MPLC, with HClO4-SiO2 and Ac2O, with an overall yield of 29.5%. A further procedure for the production of the hydroxytyrosol triacetyl derivative was consistent with the direct treatment of raw OMWW with the acetylating agent and a single step of MPLC purification, with an overall yield of 27.6%. The purified natural triacetylhydroxytyrosol confirmed the same strong protective effects against the oxidative stress in human cells as the corresponding synthetic compound, likely because of the biochemical activation of the acetyl derivative into the active parent hydroxytyrosol by esterases. We therefore propose the utilization of OMWW for recovering hydroxytyrosol as a natural antioxidant in a chemically stabilized form, with a good yield, which can be potentially used as a nontoxic functional component in nutritional, pharmaceutical, and cosmetic preparations.
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Affiliation(s)
- Renato Capasso
- Dipartimento di Scienze del Suolo, della Pianta e dell'Ambiente, Facoltà di Agraria, Università degli Studi di Napoli Federico II, Via Università 100, 80055 Portici (NA), Italy.
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