1
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Baschieri A, Jin Z, Amorati R, Vasa K, Baroncelli A, Menichetti S, Viglianisi C. Kinetic study of the reaction of thiophene-tocopherols with peroxyl radicals enlightenings the role of O˙⋯S noncovalent interactions in H-atom transfer. Org Biomol Chem 2024; 22:5965-5976. [PMID: 38984438 DOI: 10.1039/d4ob00944d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/11/2024]
Abstract
Three new α-tocopherol thiophene derivatives were efficiently synthesized, characterized and used for the first time as chain-breaking antioxidants for the inhibition of the autoxidation of reference oxidizable substrates. The rate constant of the reaction with alkylperoxyl (ROO˙) radicals and the stoichiometry of radical trapping (n) for the thiophene-tocopherol compounds were determined by measuring the oxygen consumption during the autoxidation of styrene or isopropylbenzene, using a differential pressure transducer. The measurement of the reaction with ROO˙ radicals in an apolar solvent at 30 °C showed inhibition rate constants (kinh) in the order of 104 M-1 s-1. To rationalise the kinetic results, the effect of the thiophene ring on the H-atom donation by O-H groups of the functionalized tocopherols was investigated by theoretical calculations. The importance of noncovalent interactions (including an unusual O˙⋯S bond) for the stability of the conformers has been shown, and the O-H bond dissociation enthalpy (BDE(OH)) of these derivatives was determined. Finally, the photophysical properties of these new compounds were investigated to understand if the addition of thiophene groups changes the absorption or emission spectra of the tocopherol skeleton for their possible application as luminescent molecular probes.
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Affiliation(s)
- Andrea Baschieri
- Institute for Organic Synthesis and Photoreactivity (ISOF), National Research Council of Italy (CNR), Via P. Gobetti 101, I-40129 Bologna, Italy.
| | - Zongxin Jin
- Department of Chemistry "G. Ciamician", University of Bologna, Via P. Gobetti 85, 40129 Bologna, Italy
| | - Riccardo Amorati
- Department of Chemistry "G. Ciamician", University of Bologna, Via P. Gobetti 85, 40129 Bologna, Italy
| | - Kristian Vasa
- Department of Chemistry "Ugo Schiff" - DICUS, University of Florence, Via Della Lastruccia 3-13, I-50019 Sesto Fiorentino, Firenze, Italy.
| | - Allegra Baroncelli
- Department of Chemistry "Ugo Schiff" - DICUS, University of Florence, Via Della Lastruccia 3-13, I-50019 Sesto Fiorentino, Firenze, Italy.
| | - Stefano Menichetti
- Department of Chemistry "Ugo Schiff" - DICUS, University of Florence, Via Della Lastruccia 3-13, I-50019 Sesto Fiorentino, Firenze, Italy.
| | - Caterina Viglianisi
- Department of Chemistry "Ugo Schiff" - DICUS, University of Florence, Via Della Lastruccia 3-13, I-50019 Sesto Fiorentino, Firenze, Italy.
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2
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da Silva Zanzarini I, Henrique Kita D, Scheiffer G, Karoline Dos Santos K, de Paula Dutra J, Augusto Pastore M, Gomes de Moraes Rego F, Picheth G, Ambudkar SV, Pulvirenti L, Cardullo N, Rotuno Moure V, Muccilli V, Tringali C, Valdameri G. Magnolol derivatives as specific and noncytotoxic inhibitors of breast cancer resistance protein (BCRP/ABCG2). Bioorg Chem 2024; 146:107283. [PMID: 38513324 PMCID: PMC11069345 DOI: 10.1016/j.bioorg.2024.107283] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2023] [Revised: 02/20/2024] [Accepted: 03/10/2024] [Indexed: 03/23/2024]
Abstract
The breast cancer resistance protein (BCRP/ABCG2) transporter mediates the efflux of numerous antineoplastic drugs, playing a central role in multidrug resistance related to cancer. The absence of successful clinical trials using specific ABCG2 inhibitors reveals the urge to identify new compounds to attend this critical demand. In this work, a series of 13 magnolol derivatives was tested as ABCG2 inhibitors. Only two compounds, derivatives 10 and 11, showed partial and complete ABCG2 inhibitory effect, respectively. This inhibition was selective toward ABCG2, since none of the 13 compounds inhibited neither P-glycoprotein nor MRP1. Both inhibitors (10 and 11) were not transported by ABCG2 and demonstrated a low cytotoxic profile even at high concentrations (up to 100 µM). 11 emerged as the most promising compound of the series, considering the ratio between cytotoxicity (IG50) and ABCG2 inhibition potency (IC50), showing a therapeutic ratio (TR) higher than observed for 10 (10.5 versus 1.6, respectively). This derivative showed a substrate-independent and a mixed type of inhibition. The effect of compound 11 on the ABCG2 ATPase activity and thermostability revealed allosteric protein changes. This compound did not affect the expression levels of ABCG2 and increased the binding of the conformational-sensitive antibody 5D3. A docking study showed that 11 did not share the same binding site with ABCG2 substrate mitoxantrone. Finally, 11 could revert the chemoresistance to SN-38 mediated by ABCG2.
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Affiliation(s)
- Isadora da Silva Zanzarini
- Graduate Program in Pharmaceutical Sciences, Laboratory of Cancer Drug Resistance, Federal University of Parana, Curitiba, Brazil
| | - Diogo Henrique Kita
- Graduate Program in Pharmaceutical Sciences, Laboratory of Cancer Drug Resistance, Federal University of Parana, Curitiba, Brazil; Laboratory of Cell Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - Gustavo Scheiffer
- Graduate Program in Pharmaceutical Sciences, Laboratory of Cancer Drug Resistance, Federal University of Parana, Curitiba, Brazil
| | - Kelly Karoline Dos Santos
- Graduate Program in Pharmaceutical Sciences, Laboratory of Cancer Drug Resistance, Federal University of Parana, Curitiba, Brazil
| | - Julia de Paula Dutra
- Graduate Program in Pharmaceutical Sciences, Laboratory of Cancer Drug Resistance, Federal University of Parana, Curitiba, Brazil
| | - Matteo Augusto Pastore
- Graduate Program in Pharmaceutical Sciences, Laboratory of Cancer Drug Resistance, Federal University of Parana, Curitiba, Brazil
| | | | - Geraldo Picheth
- Department of Clinical Analysis, Federal University of Parana, Curitiba, Brazil
| | - Suresh V Ambudkar
- Laboratory of Cell Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - Luana Pulvirenti
- Istituto di Chimica Biomolecolare del Consiglio Nazionale delle Ricerche (ICB-CNR), Catania, Italy
| | - Nunzio Cardullo
- Department of Chemical Sciences, University of Catania, Catania, Italy
| | - Vivian Rotuno Moure
- Graduate Program in Pharmaceutical Sciences, Laboratory of Cancer Drug Resistance, Federal University of Parana, Curitiba, Brazil
| | - Vera Muccilli
- Department of Chemical Sciences, University of Catania, Catania, Italy.
| | - Corrado Tringali
- Department of Chemical Sciences, University of Catania, Catania, Italy
| | - Glaucio Valdameri
- Graduate Program in Pharmaceutical Sciences, Laboratory of Cancer Drug Resistance, Federal University of Parana, Curitiba, Brazil.
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3
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Ming-Xin Guo MM, Wu X, Feng YF, Hu ZQ. Research Progress on the Structural Modification of Magnolol and Honokiol and the Biological Activities of Their Derivatives. Chem Biodivers 2023; 20:e202300754. [PMID: 37401658 DOI: 10.1002/cbdv.202300754] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2023] [Revised: 07/04/2023] [Accepted: 07/04/2023] [Indexed: 07/05/2023]
Abstract
Magnolol and Honokiol are the primary active components that have been identified and extracted from Magnolia officinalis, and several investigations have demonstrated that they have significant pharmacological effects. Despite their therapeutic benefits for a wide range of illnesses, research on and the implementation of these compounds have been hindered by their poor water solubility and low bioavailability. Researchers are continually using chemical methods to alter their structures to make them more effective in treating and preventing diseases. Researchers are also continuously developing derivative drugs with high efficacy and few adverse effects. This article summarizes and analyzes derivatives with significant biological activities reported in recent research obtained by structural modification. The modification sites have mainly focused on the phenolic hydroxy groups, benzene rings, and diene bonds. Changes to the allyl bisphenol structure will result in unexpected benefits, including high activity, low toxicity, and good bioavailability. Furthermore, alongside earlier experimental research in our laboratory, the structure-activity relationships of magnolol and honokiol were preliminarily summarized, providing experimental evidence for improving their development and utilization.
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Affiliation(s)
- M M Ming-Xin Guo
- Department of pharmacy, the Affiliated Yixing Hospital of Jiangsu University, Wuxi, Yixing, 214200, China
- New Drug Research and Development Center, Guangdong Pharmaceutical University, Guangzhou, 510006, China
| | - Xia Wu
- New Drug Research and Development Center, Guangdong Pharmaceutical University, Guangzhou, 510006, China
| | - Yi-Fan Feng
- New Drug Research and Development Center, Guangdong Pharmaceutical University, Guangzhou, 510006, China
| | - Zhi-Qiang Hu
- Department of pharmacy, the Affiliated Yixing Hospital of Jiangsu University, Wuxi, Yixing, 214200, China
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4
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Kostić K, Brborić J, Delogu G, Simić MR, Samardžić S, Maksimović Z, Dettori MA, Fabbri D, Kotur-Stevuljević J, Saso L. Antioxidant Activity of Natural Phenols and Derived Hydroxylated Biphenyls. Molecules 2023; 28:2646. [PMID: 36985617 PMCID: PMC10053952 DOI: 10.3390/molecules28062646] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Revised: 03/03/2023] [Accepted: 03/10/2023] [Indexed: 03/17/2023] Open
Abstract
A comparative in vitro study of the antioxidant potential of natural phenols (zingerone, curcumin, raspberry ketone, magnolol) and their synthesized derivatives was performed. The antioxidant efficiency was evaluated in blood serum obtained from healthy individuals, by means of spectrophotometry, before and after the addition of pro-oxidant tert-butyl hydroperoxide (TBH). Moreover, the antioxidant effect of an equimolar mixture of curcumin and zingerone was investigated. Interpretation of our results reveals that in the blood serum of healthy individuals curcumin (C1), raspberry ketone (RK1), magnolol (M1) and synthesized derivative of zingerone (Z2) demonstrate remarkable antioxidant effects (p < 0.05). However, in the state of TBH-induced excessive oxidative stress natural magnolol and synthesized derivatives C1, Z1 and RK1 show powerful antioxidant activity and thus can be further investigated to obtain information about their metabolic transformations and their potential influence at the cellular level. Results obtained from measurements in an equimolar mixture of zingerone and curcumin indicate synergism (p < 0.05) between the two compounds. This combination is especially successful due to the fast and efficient neutralization of added pro-oxidant TBH. The commercial availability of turmeric and ginger and their frequent combined use in diet suggest ideas for further broader utilization of the beneficial synergistic effect of their phenolic components.
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Affiliation(s)
- Kristina Kostić
- Department of Medical Biochemistry, Faculty of Pharmacy, University of Belgrade, Vojvode Stepe 450, 11221 Belgrade, Serbia; (K.K.)
| | - Jasmina Brborić
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Belgrade, Vojvode Stepe 450, 11221 Belgrade, Serbia;
| | - Giovanna Delogu
- Sassari Unit, Institute of Biomolecular Chemistry of CNR, Traversa La Crucca 3, 07100 Sassari, Italy; (G.D.); (M.A.D.)
| | - Milena R. Simić
- Department of Organic Chemistry, Faculty of Pharmacy, University of Belgrade, Vojvode Stepe 450, 11221 Belgrade, Serbia
| | - Stevan Samardžić
- Department of Pharmacognosy, Faculty of Pharmacy, University of Belgrade, Vojvode Stepe 450, 11221 Belgrade, Serbia; (S.S.); (Z.M.)
| | - Zoran Maksimović
- Department of Pharmacognosy, Faculty of Pharmacy, University of Belgrade, Vojvode Stepe 450, 11221 Belgrade, Serbia; (S.S.); (Z.M.)
| | - Maria Antonietta Dettori
- Sassari Unit, Institute of Biomolecular Chemistry of CNR, Traversa La Crucca 3, 07100 Sassari, Italy; (G.D.); (M.A.D.)
| | - Davide Fabbri
- Sassari Unit, Institute of Biomolecular Chemistry of CNR, Traversa La Crucca 3, 07100 Sassari, Italy; (G.D.); (M.A.D.)
| | - Jelena Kotur-Stevuljević
- Department of Medical Biochemistry, Faculty of Pharmacy, University of Belgrade, Vojvode Stepe 450, 11221 Belgrade, Serbia; (K.K.)
| | - Luciano Saso
- Department of Physiology and Pharmacology “Vittorio Erspamer”, Sapienza University of Rome, Piazzale Aldo Moro 5, 00185 Rome, Italy;
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5
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Cardullo N, Monti F, Muccilli V, Amorati R, Baschieri A. Reaction with ROO• and HOO• Radicals of Honokiol-Related Neolignan Antioxidants. MOLECULES (BASEL, SWITZERLAND) 2023; 28:molecules28020735. [PMID: 36677790 PMCID: PMC9867055 DOI: 10.3390/molecules28020735] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/30/2022] [Revised: 01/05/2023] [Accepted: 01/07/2023] [Indexed: 01/15/2023]
Abstract
Honokiol is a natural bisphenol neolignan present in the bark of Magnolia officinalis, whose extracts have been employed in oriental medicine to treat several disorders, showing a variety of biological properties, including antitumor activity, potentially related to radical scavenging. Six bisphenol neolignans with structural motifs related to the natural bioactive honokiol were synthesized. Their chain-breaking antioxidant activity was evaluated in the presence of peroxyl (ROO•) and hydroperoxyl (HOO•) radicals by both experimental and computational methods. Depending on the number and position of the hydroxyl and alkyl groups present on the molecules, these derivatives are more or less effective than the reference natural compound. The rate constant of the reaction with ROO• radicals for compound 7 is two orders of magnitude greater than that of honokiol. Moreover, for compounds displaying quinonic oxidized forms, we demonstrate that the addition of 1,4 cyclohexadiene, able to generate HOO• radicals, restores their antioxidant activity, because of the reducing capability of the HOO• radicals. The antioxidant activity of the oxidized compounds in combination with 1,4-cyclohexadiene is, in some cases, greater than that found for the starting compounds towards the peroxyl radicals. This synergy can be applied to maximize the performances of these new bisphenol neolignans.
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Affiliation(s)
- Nunzio Cardullo
- Dipartimento di Scienze Chimiche, Università di Catania, V.le A. Doria 6, 95125 Catania, Italy
| | - Filippo Monti
- Istituto per la Sintesi Organica e la Fotoreattività (ISOF), Consiglio Nazionale delle Ricerche (CNR), Via Gobetti 101, 40129 Bologna, Italy
| | - Vera Muccilli
- Dipartimento di Scienze Chimiche, Università di Catania, V.le A. Doria 6, 95125 Catania, Italy
| | - Riccardo Amorati
- Dipartimento di Chimica “G. Ciamician”, Università di Bologna, Via S. Giacomo 11, 40126 Bologna, Italy
- Correspondence: (R.A.); (A.B.)
| | - Andrea Baschieri
- Istituto per la Sintesi Organica e la Fotoreattività (ISOF), Consiglio Nazionale delle Ricerche (CNR), Via Gobetti 101, 40129 Bologna, Italy
- Correspondence: (R.A.); (A.B.)
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6
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Synthesized Magnolol Derivatives Improve Anti-Micropterus salmoides Rhabdovirus (MSRV) Activity In Vivo. Viruses 2022; 14:v14071421. [PMID: 35891401 PMCID: PMC9324556 DOI: 10.3390/v14071421] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2022] [Revised: 06/22/2022] [Accepted: 06/23/2022] [Indexed: 12/10/2022] Open
Abstract
Micropterus salmoides rhabdovirus (MSRV) is a primary viral pathogen in largemouth bass aquaculture, which leads to tremendous economic losses yearly. Currently, there are no approved drugs for the treatment and control of this virus. Our previous studies screened the herb Magnolia officinalis from many traditional Chinese medicines, and we isolated and identified magnolol as its main active compound against multiple rhabdoviruses, including MSRV. On the basis of the structure–activity relationship and pharmacophore model of magnolol, two new magnolol derivatives, namely, hydrogenated magnolol and 2,2′-dimethoxy-magnolol, were designed and synthesized. Their anti-MSRV activities were systematically investigated both in vitro and in vivo. By comparing the half-maximal inhibitory concentration (IC50), it was found that hydrogenated magnolol possessed a higher anti-MSRV activity than magnolol and 2,2′-dimethoxy-magnolol, with an IC50 of 13.37 μM. Furthermore, hydrogenated magnolol exhibited a protective effect on the grass carp ovary (GCO) cell line by reducing the cytopathic effect induced by MSRV. Further studies revealed that hydrogenated magnolol did not directly impact virions or interfere with MSRV adsorption. It worked within the 6–8 h of the phase of virus replication. In vivo treatment of MSRV infection with magnolol and hydrogenated magnolol showed that they significantly improved the survival rate by 44.6% and 62.7%, respectively, compared to MSRV-infected groups. The viral load measured by the expression of viral glycoprotein in the organs including the liver, spleen, and kidney also significantly decreased when fish were intraperitoneally injected at a dose of 20 mg/kg. Altogether, the structural optimization of magnolol via hydrogenation of the propylene groups increased its anti-MSRV activity both in vitro and in vivo. These results may provide a valuable reference for anti-MSRV drug discovery and development in aquaculture.
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7
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A green and effective route leading to antiradical agents with 3-arylmethyl 4-hydroxyquinolin-2(1H)-one moiety. Tetrahedron Lett 2022. [DOI: 10.1016/j.tetlet.2022.153847] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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8
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Liu Y, Zhu T, Li J, Bao Y, Cheng B, Chen S, Du J, Hu S. Magnolol Hybrid Nanofibrous Mat with Antibacterial, Anti-Inflammatory, and Microvascularized Properties for Wound Treatment. Biomacromolecules 2022; 23:1124-1137. [DOI: 10.1021/acs.biomac.1c01430] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Yonghang Liu
- School of Chemistry and Chemical Engineering, Shanghai Engineering Research Center of Pharmaceutical Intelligent Equipment, Shanghai Frontiers Science Research Center for Druggability of Cardiovascular Non-coding RNA, Institute for Frontier Medical Technology, Shanghai University of Engineering Science, 333 Longteng Road, Shanghai 201620, P. R. China
| | - Tonghe Zhu
- School of Chemistry and Chemical Engineering, Shanghai Engineering Research Center of Pharmaceutical Intelligent Equipment, Shanghai Frontiers Science Research Center for Druggability of Cardiovascular Non-coding RNA, Institute for Frontier Medical Technology, Shanghai University of Engineering Science, 333 Longteng Road, Shanghai 201620, P. R. China
| | - Jun Li
- Department of Orthopedics, Shanghai Tenth People’s Hospital Affiliated to Tongji University, 301 Yanchang Road, Shanghai 200072, P. R. China
| | - Yiming Bao
- School of Chemistry and Chemical Engineering, Shanghai Engineering Research Center of Pharmaceutical Intelligent Equipment, Shanghai Frontiers Science Research Center for Druggability of Cardiovascular Non-coding RNA, Institute for Frontier Medical Technology, Shanghai University of Engineering Science, 333 Longteng Road, Shanghai 201620, P. R. China
| | - Biao Cheng
- Department of Orthopedics, Shanghai Tenth People’s Hospital Affiliated to Tongji University, 301 Yanchang Road, Shanghai 200072, P. R. China
| | - Sihao Chen
- School of Chemistry and Chemical Engineering, Shanghai Engineering Research Center of Pharmaceutical Intelligent Equipment, Shanghai Frontiers Science Research Center for Druggability of Cardiovascular Non-coding RNA, Institute for Frontier Medical Technology, Shanghai University of Engineering Science, 333 Longteng Road, Shanghai 201620, P. R. China
| | - Juan Du
- School of Chemistry and Chemical Engineering, Shanghai Engineering Research Center of Pharmaceutical Intelligent Equipment, Shanghai Frontiers Science Research Center for Druggability of Cardiovascular Non-coding RNA, Institute for Frontier Medical Technology, Shanghai University of Engineering Science, 333 Longteng Road, Shanghai 201620, P. R. China
| | - Shaowei Hu
- ENT Institute and Department of Otorhinolaryngology, Eye & ENT Hospital, State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Institutes of Biomedical Sciences of Fudan University, NHC Key Laboratory of Hearing Medicine of Fudan University, Fudan University, 83 Fenyang Road, Shanghai 200031, P. R. China
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9
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Mieriņa I, Peipiņa E, Aišpure K, Jure M. 1st generation dendrimeric antioxidants containing Meldrum's acid moieties as surface groups. NEW J CHEM 2022. [DOI: 10.1039/d1nj03830c] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The first small branched architectures decorated with 1,3-dioxane-4,6-dione moieties containing dendrons are synthesized and their antiradical properties are demonstrated.
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Affiliation(s)
- Inese Mieriņa
- Institute of Technology of Organic Chemistry, Faculty of Materials Science and Applied Chemistry, Riga Technical University, Paula Valdena Str. 3/7, Riga, LV 1048, Latvia
| | - Elīna Peipiņa
- Institute of Technology of Organic Chemistry, Faculty of Materials Science and Applied Chemistry, Riga Technical University, Paula Valdena Str. 3/7, Riga, LV 1048, Latvia
| | - Klaudija Aišpure
- Institute of Technology of Organic Chemistry, Faculty of Materials Science and Applied Chemistry, Riga Technical University, Paula Valdena Str. 3/7, Riga, LV 1048, Latvia
| | - Māra Jure
- Institute of Technology of Organic Chemistry, Faculty of Materials Science and Applied Chemistry, Riga Technical University, Paula Valdena Str. 3/7, Riga, LV 1048, Latvia
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10
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Mollica F, Lucernati R, Amorati R. Expanding the spectrum of polydopamine antioxidant activity by nitroxide conjugation. J Mater Chem B 2021; 9:9980-9988. [PMID: 34873604 DOI: 10.1039/d1tb02154k] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Polydopamine (PDA) materials are important due to their unique physicochemical properties and their potential as chemopreventive agents for diseases connected with oxidative stress. Although PDA has been suggested to display antioxidant activity, its efficacy is controversial and its mechanism of action is still unclear. Herein, we report that accurately purified PDA nanoparticles in water at pH 7.4 are unable to quench alkylperoxyls (ROO˙), which are the radicals responsible for the propagation of lipid peroxidation, despite PDA reacting with the model DPPH˙ and ABTS˙+ radicals. PDA nanoparticles prepared by copolymerization of dopamine with the dialkyl nitroxide 4-NH2TEMPO show instead good antioxidant activity, thanks to the ROO˙ trapping ability of the nitroxide. Theoretical calculations performed on a quinone-catechol dimer, reproducing the structural motive of PDA, indicate a reactivity with ROO˙ similar to catechol. These results suggest that PDA nanoparticles have an "onion-like" structure, with a catechol-rich core, which can be reached only by DPPH˙ and ABTS˙+, and a surface mainly represented by quinones. The importance of assessing the antioxidant activity by inhibited autoxidation studies is also discussed.
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Affiliation(s)
- Fabio Mollica
- Department of Chemistry "G. Ciamician", University of Bologna, Via S. Giacomo 11, 40126, Bologna, Italy.
| | - Rosa Lucernati
- Department of Chemistry "G. Ciamician", University of Bologna, Via S. Giacomo 11, 40126, Bologna, Italy.
| | - Riccardo Amorati
- Department of Chemistry "G. Ciamician", University of Bologna, Via S. Giacomo 11, 40126, Bologna, Italy.
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11
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Yu CP, Li PY, Chen SY, Lin SP, Hou YC. Magnolol and Honokiol Inhibited the Function and Expression of BCRP with Mechanism Exploration. Molecules 2021; 26:7390. [PMID: 34885972 PMCID: PMC8659015 DOI: 10.3390/molecules26237390] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Revised: 11/25/2021] [Accepted: 12/04/2021] [Indexed: 11/21/2022] Open
Abstract
Breast cancer resistance protein (BCRP), one of the ATP-binding cassette (ABC) transporters, was associated with the multidrug resistance (MDR) of chemotherapy. Magnolol (MN) and honokiol (HK) are major bioactive polyphenols of Magnolia officinalis. This study investigated the effects of MN and HK on the function and expression of BCRP for the purpose of developing BCRP inhibitor to overcome MDR. Cell lines including MDCKII-BCRP and MDCKII-WT were used for evaluating the function and expression of BCRP. The results showed that MN (100-12.5 µM) and HK (100-12.5 µM) significantly decreased the function of BCRP by 80~12% and 67~14%, respectively. In addition, MN and HK were verified as substrates of BCRP. Furthermore, MN and HK reduced the protein expression of BCRP, and inhibited the phosphorylation of epidermal growth factor receptor (EGFR) and phosphatidylinositol 3-kinase (PI3K). In conclusion, both MN and HK decreased the function and expression of BCRP via EGFR/PI3K signaling pathway. Therefore, both compounds were promising candidates for reversing the MDR of chemotherapy.
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Affiliation(s)
- Chung-Ping Yu
- School of Pharmacy, College of Pharmacy, China Medical University, Taichung 406040, Taiwan; (C.-P.Y.); (P.-Y.L.); (S.-Y.C.)
- Department of Pharmacy, China Medical University Hospital, Taichung 404332, Taiwan
| | - Pei-Ying Li
- School of Pharmacy, College of Pharmacy, China Medical University, Taichung 406040, Taiwan; (C.-P.Y.); (P.-Y.L.); (S.-Y.C.)
| | - Szu-Yu Chen
- School of Pharmacy, College of Pharmacy, China Medical University, Taichung 406040, Taiwan; (C.-P.Y.); (P.-Y.L.); (S.-Y.C.)
| | - Shiuan-Pey Lin
- School of Pharmacy, College of Pharmacy, China Medical University, Taichung 406040, Taiwan; (C.-P.Y.); (P.-Y.L.); (S.-Y.C.)
| | - Yu-Chi Hou
- School of Pharmacy, College of Pharmacy, China Medical University, Taichung 406040, Taiwan; (C.-P.Y.); (P.-Y.L.); (S.-Y.C.)
- Department of Pharmacy, China Medical University Hospital, Taichung 404332, Taiwan
- College of Medical and Health Science, Asia University, Taichung 41354, Taiwan
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12
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Guo Y, Pizzol R, Gabbanini S, Baschieri A, Amorati R, Valgimigli L. Absolute Antioxidant Activity of Five Phenol-Rich Essential Oils. Molecules 2021; 26:5237. [PMID: 34500670 PMCID: PMC8434318 DOI: 10.3390/molecules26175237] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2021] [Revised: 08/24/2021] [Accepted: 08/25/2021] [Indexed: 12/29/2022] Open
Abstract
Essential oils (EOs) have promising antioxidant activities which are gaining interest as natural alternatives to synthetic antioxidants in the food and cosmetic industries. However, quantitative data on chain-breaking activity and on the kinetics of peroxyl radical trapping are missing. Five phenol-rich EOs were analyzed by GC-MS and studied by oxygen-uptake kinetics in inhibited controlled autoxidations of reference substrates (cumene and squalene). Terpene-rich Thymus vulgaris (thymol 4%; carvacrol 33.9%), Origanum vulgare, (thymol 0.4%; carvacrol 66.2%) and Satureja hortensis, (thymol 1.7%; carvacrol 46.6%), had apparent kinh (30 °C, PhCl) of (1.5 ± 0.3) × 104, (1.3 ± 0.1) × 104 and (1.1 ± 0.3) × 104 M-1s-1, respectively, while phenylpropanoid-rich Eugenia caryophyllus (eugenol 80.8%) and Cinnamomum zeylanicum, (eugenol 81.4%) showed apparent kinh (30 °C, PhCl) of (5.0 ± 0.1) × 103 and (4.9 ± 0.3) × 103 M-1s-1, respectively. All EOs already granted good antioxidant protection of cumene at a concentration of 1 ppm (1 mg/L), the duration being proportional to their phenolic content, which dictated their antioxidant behavior. They also afforded excellent protection of squalene after adjusting their concentration (100 mg/L) to account for the much higher oxidizability of this substrate. All investigated EOs had kinh comparable to synthetic butylated hydroxytoluene (BHT) were are eligible to replace it in the protection of food or cosmetic products.
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Affiliation(s)
- Yafang Guo
- Department of Chemistry “G. Ciamician”, University of Bologna, Via S. Giacomo 11, 40126 Bologna, Italy; (Y.G.); (R.P.); (R.A.)
| | - Romeo Pizzol
- Department of Chemistry “G. Ciamician”, University of Bologna, Via S. Giacomo 11, 40126 Bologna, Italy; (Y.G.); (R.P.); (R.A.)
| | - Simone Gabbanini
- Research & Development—BeC s.r.l., Via C. Monteverdi 49, 47122 Forlì, Italy;
| | - Andrea Baschieri
- The Institute of Organic Synthesis and Photoreactivity, Consiglio Nazionale delle Ricerche (CNR), Via P. Gobetti 101, 40129 Bologna, Italy;
| | - Riccardo Amorati
- Department of Chemistry “G. Ciamician”, University of Bologna, Via S. Giacomo 11, 40126 Bologna, Italy; (Y.G.); (R.P.); (R.A.)
| | - Luca Valgimigli
- Department of Chemistry “G. Ciamician”, University of Bologna, Via S. Giacomo 11, 40126 Bologna, Italy; (Y.G.); (R.P.); (R.A.)
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13
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Natural Chain-Breaking Antioxidants and Their Synthetic Analogs as Modulators of Oxidative Stress. Antioxidants (Basel) 2021; 10:antiox10040624. [PMID: 33921802 PMCID: PMC8074124 DOI: 10.3390/antiox10040624] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Revised: 04/12/2021] [Accepted: 04/13/2021] [Indexed: 11/24/2022] Open
Abstract
Oxidative stress is associated with the increased production of reactive oxygen species or with a significant decrease in the effectiveness of antioxidant enzymes and nonenzymatic defense. The penetration of oxygen and free radicals in the hydrophobic interior of biological membranes initiates radical disintegration of the hydrocarbon “tails” of the lipids. This process is known as “lipid peroxidation”, and the accumulation of the oxidation products as peroxides and the aldehydes and acids derived from them are often used as a measure of oxidative stress levels. In total, 40 phenolic antioxidants were selected for a comparative study and analysis of their chain-breaking antioxidant activity, and thus as modulators of oxidative stress. This included natural and natural-like ortho-methoxy and ortho-hydroxy phenols, nine of them newly synthesized. Applied experimental and theoretical methods (bulk lipid autoxidation, chemiluminescence, in silico methods such as density functional theory (DFT) and quantitative structure–activity relationship ((Q)SAR) modeling) were used to clarify their structure–activity relationship. Kinetics of non-inhibited and inhibited lipid oxidation in close connection with inhibitor transformation under oxidative stress is considered. Special attention has been paid to chemical reactions resulting in the initiation of free radicals, a key stage of oxidative stress. Effects of substituents in the side chains and in the phenolic ring of hydroxylated phenols and biphenols, and the concentration were discussed.
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14
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Lin Y, Li Y, Zeng Y, Tian B, Qu X, Yuan Q, Song Y. Pharmacology, Toxicity, Bioavailability, and Formulation of Magnolol: An Update. Front Pharmacol 2021; 12:632767. [PMID: 33815113 PMCID: PMC8010308 DOI: 10.3389/fphar.2021.632767] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Accepted: 02/15/2021] [Indexed: 12/16/2022] Open
Abstract
Magnolol (MG) is one of the primary active components of Magnoliae officinalis cortex, which has been widely used in traditional Chinese and Japanese herbal medicine and possesses a wide range of pharmacological activities. In recent years, attention has been drawn to this component due to its potential as an anti-inflammatory and antitumor drug. To summarize the new biological and pharmacological data on MG, we screened the literature from January 2011 to October 2020. In this review, we provide an actualization of already known anti-inflammatory, cardiovascular protection, antiangiogenesis, antidiabetes, hypoglycemic, antioxidation, neuroprotection, gastrointestinal protection, and antibacterial activities of MG. Besides, results from studies on antitumor activity are presented. We also summarized the molecular mechanisms, toxicity, bioavailability, and formulations of MG. Therefore, we provide a valid cognition of MG.
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Affiliation(s)
- Yiping Lin
- School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Yuke Li
- School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Yuanlian Zeng
- School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Bin Tian
- School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Xiaolan Qu
- School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Qianghua Yuan
- Affiliated Hospital of Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Ying Song
- Affiliated Hospital of Chengdu University of Traditional Chinese Medicine, Chengdu, China
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15
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Zhang Z, He Z, Xie Y, He T, Fu Y, Yu Y, Huang F. Brønsted acid-catalyzed homogeneous O–H and S–H insertion reactions under metal- and ligand-free conditions. Org Chem Front 2021. [DOI: 10.1039/d0qo01401j] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The economical and accessible CF3SO3H successfully catalyzed homogeneous O–H and S–H bond insertion reactions between hydroxyl compounds, thiols and diazo compounds under metal- and ligand-free conditions.
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Affiliation(s)
- Zhipeng Zhang
- School of Food Science and Pharmaceutical Engineering
- Nanjing Normal University
- Nanjing 210023
- P. R. China
- School of Biology and Biological Engineering
| | - Zhiqin He
- School of Food Science and Pharmaceutical Engineering
- Nanjing Normal University
- Nanjing 210023
- P. R. China
| | - Yuxing Xie
- School of Food Science and Pharmaceutical Engineering
- Nanjing Normal University
- Nanjing 210023
- P. R. China
| | - Tiantong He
- School of Pharmaceutical Sciences
- Nanjing Tech University
- Nanjing 211816
- P. R. China
| | - Yaofeng Fu
- School of Pharmaceutical Sciences
- Nanjing Tech University
- Nanjing 211816
- P. R. China
| | - Yang Yu
- School of Environmental Science and Engineering
- Nanjing Tech University
- Nanjing
- China
| | - Fei Huang
- School of Food Science and Pharmaceutical Engineering
- Nanjing Normal University
- Nanjing 210023
- P. R. China
- School of Pharmaceutical Sciences
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16
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A Rare Natural Benzo[ k, l]xanthene as a Turn-Off Fluorescent Sensor for Cu 2+ Ion. Int J Mol Sci 2020; 21:ijms21186933. [PMID: 32967305 PMCID: PMC7555586 DOI: 10.3390/ijms21186933] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Revised: 09/17/2020] [Accepted: 09/18/2020] [Indexed: 12/28/2022] Open
Abstract
Rapid and efficient analyses of copper ions are crucial to providing key information for Cu2+ in living cells because of their biological importance. In this study, we reported one new turn-off fluorescent sensor for Cu2+ with a benzo[k,l]xanthene core, which served as an efficient cation sensor for copper ion over a wide range of other cations (Na+, K+, Ag+, Hg2+, Cd2+, Co2+, Ni2+, Zn2+, Mg2+, and Fe3+) owing to the catechol group in the aromatic core. The sensor showed selectivity for Cu2+ over other ions; the logKβ for Cu2+ binding to compound 1 had a value of 13.265. In the presence of Cu2+, sensor 1 provided significant fluorescence decrement; Co2+, and Ni2+ caused a fluorescence decrement when employed at a higher concentration than Cu2+, while Na+, K+, Hg2+, Cd2+, Zn2+, and Mg2+ metal ions produced only minor changes in fluorescence intensity. Fluorescence experiments demonstrate that compound 1 may have an application as a fluorescent probe for detecting Cu2+ with a limit of detection of 0.574 µM.
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17
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Cardullo N, Barresi V, Muccilli V, Spampinato G, D’Amico M, Condorelli DF, Tringali C. Synthesis of Bisphenol Neolignans Inspired by Honokiol as Antiproliferative Agents. Molecules 2020; 25:molecules25030733. [PMID: 32046220 PMCID: PMC7037512 DOI: 10.3390/molecules25030733] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2020] [Revised: 02/04/2020] [Accepted: 02/05/2020] [Indexed: 12/12/2022] Open
Abstract
Honokiol (2) is a natural bisphenol neolignan showing a variety of biological properties, including antitumor activity. Some studies pointed out 2 as a potential anticancer agent in view of its antiproliferative and pro-apoptotic activity towards tumor cells. As a further contribution to these studies, we report here the synthesis of a small library of bisphenol neolignans inspired by honokiol and the evaluation of their antiproliferative activity. The natural lead was hence subjected to simple chemical modifications to obtain the derivatives 3–9; further neolignans (12a-c, 13a-c, 14a-c, and 15a) were synthesized employing the Suzuki–Miyaura reaction, thus obtaining bisphenols with a substitution pattern different from honokiol. These compounds and the natural lead were subjected to antiproliferative assay towards HCT-116, HT-29, and PC3 tumor cell lines. Six of the neolignans show GI50 values lower than those of 2 towards all cell lines. Compounds 14a, 14c, and 15a are the most effective antiproliferative agents, with GI50 in the range of 3.6–19.1 µM, in some cases it is lower than those of the anticancer drug 5-fluorouracil. Flow cytometry experiments performed on these neolignans showed that the inhibition of proliferation is mainly due to an apoptotic process. These results indicate that the structural modification of honokiol may open the way to obtaining antitumor neolignans more potent than the natural lead.
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Affiliation(s)
- Nunzio Cardullo
- Department of Chemical Sciences, University of Catania, Viale A. Doria 6, 95125 Catania, Italy;
- Correspondence: (C.T.); (N.C.); Tel.: +39-095-7385025 (C.T.)
| | - Vincenza Barresi
- Department of Biomedical and Biotechnological Sciences, Section of Medical Biochemistry, University of Catania, Via Santa Sofia 97, 95123 Catania, Italy; (V.B.); (G.S.); (M.D.); (D.F.C.)
| | - Vera Muccilli
- Department of Chemical Sciences, University of Catania, Viale A. Doria 6, 95125 Catania, Italy;
| | - Giorgia Spampinato
- Department of Biomedical and Biotechnological Sciences, Section of Medical Biochemistry, University of Catania, Via Santa Sofia 97, 95123 Catania, Italy; (V.B.); (G.S.); (M.D.); (D.F.C.)
| | - Morgana D’Amico
- Department of Biomedical and Biotechnological Sciences, Section of Medical Biochemistry, University of Catania, Via Santa Sofia 97, 95123 Catania, Italy; (V.B.); (G.S.); (M.D.); (D.F.C.)
| | - Daniele Filippo Condorelli
- Department of Biomedical and Biotechnological Sciences, Section of Medical Biochemistry, University of Catania, Via Santa Sofia 97, 95123 Catania, Italy; (V.B.); (G.S.); (M.D.); (D.F.C.)
| | - Corrado Tringali
- Department of Chemical Sciences, University of Catania, Viale A. Doria 6, 95125 Catania, Italy;
- Correspondence: (C.T.); (N.C.); Tel.: +39-095-7385025 (C.T.)
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18
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Fontana A, Guernelli S, Di Crescenzo A, Di Profio P, Palomba F, De Crescentini L, Baschieri A, Amorati R. Cardanol-like co-surfactants solubilized in pegylated micelles keep their antioxidant activity and preserve polyethylene glycol chains from oxidation. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.111465] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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19
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Baschieri A, Amorati R, Valgimigli L, Sambri L. 1-Methyl-1,4-cyclohexadiene as a Traceless Reducing Agent for the Synthesis of Catechols and Hydroquinones. J Org Chem 2019; 84:13655-13664. [DOI: 10.1021/acs.joc.9b01898] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Andrea Baschieri
- Dipartimento di Chimica “G. Ciamician”, Università di Bologna, Via S. Giacomo 11, 40126 Bologna, Italy
| | - Riccardo Amorati
- Dipartimento di Chimica “G. Ciamician”, Università di Bologna, Via S. Giacomo 11, 40126 Bologna, Italy
| | - Luca Valgimigli
- Dipartimento di Chimica “G. Ciamician”, Università di Bologna, Via S. Giacomo 11, 40126 Bologna, Italy
| | - Letizia Sambri
- Dipartimento di Chimica Industriale “T. Montanari”Università di Bologna, Viale Risorgimento 4, 40136 Bologna, Italy
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20
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Viglianisi C, Vasa K, Tanini D, Capperucci A, Amorati R, Valgimigli L, Baschieri A, Menichetti S. Ditocopheryl Sulfides and Disulfides: Synthesis and Antioxidant Profile. Chemistry 2019; 25:9108-9116. [PMID: 31017702 DOI: 10.1002/chem.201901537] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2019] [Indexed: 12/14/2022]
Abstract
Symmetrical ditocopheryl disulfides (Toc)2 S2 and symmetrical and unsymmetrical ditocopheryl sulfides (Toc)2 S were simply prepared under remarkably mild conditions with complete control of the regiochemistry by using δ-, γ-, and β-tocopheryl-N-thiophthalimides (Toc-NSPht) as common starting materials. The roles of sulfur atom(s), H-bond and aryl ring substitution pattern on the antioxidant profile of these new compounds, which were assembled by linking together two tocopheryl units, are also discussed.
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Affiliation(s)
- Caterina Viglianisi
- Department of Chemistry "Ugo Schiff", University of Florence, Via Della Lastruccia 3-13, Sesto Fiorentino, Firenze, Italy
| | - Kristian Vasa
- Department of Chemistry "Ugo Schiff", University of Florence, Via Della Lastruccia 3-13, Sesto Fiorentino, Firenze, Italy
| | - Damiano Tanini
- Department of Chemistry "Ugo Schiff", University of Florence, Via Della Lastruccia 3-13, Sesto Fiorentino, Firenze, Italy
| | - Antonella Capperucci
- Department of Chemistry "Ugo Schiff", University of Florence, Via Della Lastruccia 3-13, Sesto Fiorentino, Firenze, Italy
| | - Riccardo Amorati
- Department of Chemistry "G. Ciamician", University of Bologna, Via S. Giacomo 11, 40126, Bologna, Italy
| | - Luca Valgimigli
- Department of Chemistry "G. Ciamician", University of Bologna, Via S. Giacomo 11, 40126, Bologna, Italy
| | - Andrea Baschieri
- Department of Chemistry "G. Ciamician", University of Bologna, Via S. Giacomo 11, 40126, Bologna, Italy
| | - Stefano Menichetti
- Department of Chemistry "Ugo Schiff", University of Florence, Via Della Lastruccia 3-13, Sesto Fiorentino, Firenze, Italy
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21
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Vo QV, Nam PC, Thong NM, Trung NT, Phan CTD, Mechler A. Antioxidant Motifs in Flavonoids: O-H versus C-H Bond Dissociation. ACS OMEGA 2019; 4:8935-8942. [PMID: 31459981 PMCID: PMC6648838 DOI: 10.1021/acsomega.9b00677] [Citation(s) in RCA: 46] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2019] [Accepted: 05/09/2019] [Indexed: 05/10/2023]
Abstract
Flavonoids provide potential health benefits due to their antioxidant properties. The antioxidant activity of natural flavonoids is primarily exerted by phenolic hydroxyl groups; however, C-H bonds also contribute to these properties. In this study, the contributions of phenolic groups and C-H bonds to the antioxidant properties of 13 flavonoids were investigated by using the (RO)B3LYP/6-311++G(2df,2p)//B3LYP/6-311G(d,p) model chemistry in the gas phase and water and ethanol solvents. It was found that the C-H bonds have lower bond dissociation energies than O-H bonds in the 4-carbonyl and/or 3-hydroxyl group containing flavonoids and hence define antioxidant activity. The HOO· radical scavenging of the selected flavonoids is also investigated in detail through the potential energy surface, natural bond orbitals, and kinetic calculations. It was found that the favored radical scavenging mechanism of the flavonoids is hydrogen atom transfer, with the gas phase rate constants in the range of 7.23 × 103-2.07 × 109 L·mol-1·s-1. The results suggest that the flavonoids, isomelacacidin, isoteracacidin, melacacidin, and teracacidin, have antioxidant properties as high as typical phenolic compounds such as quercetin, trans-resveratrol, trolox, and ascorbic acid.
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Affiliation(s)
- Quan V. Vo
- Department
for Management of Science and Technology Development, Ton Duc Thang University, Ho Chi Minh City 7000000, Vietnam
- Faculty of Applied Sciences, Ton Duc Thang
University, Ho Chi
Minh City 7000000, Vietnam
| | - Pham Cam Nam
- Department
of Chemical Engineering, The University
of Danang - University of Science and Technology, Da Nang 550000, Vietnam
| | - Nguyen Minh Thong
- The
University of Danang, Campus in Kon Tum, 704 Phan Dinh Phung, Kon
Tum 580000, Vietnam
| | - Nguyen Tien Trung
- Department
of Chemistry, Quy Nhon University, Quy Nhon 591300, Vietnam
| | - Cam-Tu D. Phan
- Department
of Chemistry, Quy Nhon University, Quy Nhon 591300, Vietnam
| | - Adam Mechler
- Department
of Chemistry and Physics, La Trobe University, Melbourne, Victoria 3086, Australia
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22
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Viglianisi C, Menichetti S, Morelli P, Baschieri A, Amorati R. From catechol‐tocopherol to catechol‐hydroquinone polyphenolic antioxidant hybrids. HETEROATOM CHEMISTRY 2018. [DOI: 10.1002/hc.21466] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Caterina Viglianisi
- Department of Chemistry “Ugo Schiff”University of Florence Sesto Fiorentino Italy
| | - Stefano Menichetti
- Department of Chemistry “Ugo Schiff”University of Florence Sesto Fiorentino Italy
| | - Paola Morelli
- Department of Chemistry “Ugo Schiff”University of Florence Sesto Fiorentino Italy
| | - Andrea Baschieri
- Department of Chemistry “G. Ciamician”University of Bologna Bologna Italy
| | - Riccardo Amorati
- Department of Chemistry “G. Ciamician”University of Bologna Bologna Italy
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23
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Foti MC, Amorati R, Baschieri A, Rocco C. Singlet oxygen quenching- and chain-breaking antioxidant-properties of a quercetin dimer able to prevent age-related macular degeneration. Biophys Chem 2018; 243:17-23. [PMID: 30352336 DOI: 10.1016/j.bpc.2018.10.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2018] [Revised: 09/18/2018] [Accepted: 10/03/2018] [Indexed: 01/07/2023]
Abstract
A dimer of quercetin prepared through a Mannich reaction protects pyridinium bisretinoid A2E from photooxidation at 430 nm in aqueous medium at pH 7.4. In the presence of light and O2, A2E is quickly attacked by 1O2 produced in situ (by excited A2E) to give nonaoxirane and other oxygenated compounds which can be involved in diseases of the macula. Peroxyl radicals might have only a marginal role on the photooxidation of A2E. The dimer is actually a potent quencher of 1O2 with a rate constant kQ of 8.5 × 108 M-1 s-1 in methanol at room temperature. On the other hand, its antioxidant abilities against ROO· radicals are quite limited since kROO· = 7.3 × 105 M-1 s-1 (in buffer solution at pH 7.4), the value being essentially identical to that of quercetin. The quenching of 1O2 by the dimer is therefore the main reason for the A2E protection and prevention of age-related macular degeneration.
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Affiliation(s)
- Mario C Foti
- Istituto di Chimica Biomolecolare del CNR, via P. Gaifami 18, I-95126 Catania, Italy.
| | - Riccardo Amorati
- Department of Chemistry "G. Ciamician", University of Bologna, Via S. Giacomo 11, 40126 Bologna, Italy
| | - Andrea Baschieri
- Department of Chemistry "G. Ciamician", University of Bologna, Via S. Giacomo 11, 40126 Bologna, Italy
| | - Concetta Rocco
- Istituto di Chimica Biomolecolare del CNR, via P. Gaifami 18, I-95126 Catania, Italy
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24
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Panzella L, D'Errico G, Vitiello G, Perfetti M, Alfieri ML, Napolitano A, d'Ischia M. Disentangling structure-dependent antioxidant mechanisms in phenolic polymers by multiparametric EPR analysis. Chem Commun (Camb) 2018; 54:9426-9429. [PMID: 30079414 DOI: 10.1039/c8cc05989f] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Excellent and selective correlations between the electron-transfer (ET) or hydrogen atom transfer (HAT) capacity (DPPH and lipid peroxidation inhibition assays) and EPR indices of π-electron spin delocalization delineate specific structural determinants of antioxidant activity in biomimetic phenolic polymers.
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Affiliation(s)
- Lucia Panzella
- Department of Chemical Sciences, University of Naples "Federico II", Via Cintia 4, Naples, I-80126, Italy.
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25
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Density functional theory study of the role of benzylic hydrogen atoms in the antioxidant properties of lignans. Sci Rep 2018; 8:12361. [PMID: 30120382 PMCID: PMC6098005 DOI: 10.1038/s41598-018-30860-5] [Citation(s) in RCA: 53] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2018] [Accepted: 08/06/2018] [Indexed: 02/04/2023] Open
Abstract
Antioxidants are a diverse group of chemicals with proven health benefits and thus potential preventive medicine and therapeutic applications. While most of these compounds are natural products, determining their mechanism of radical scavenging and common motifs that contribute to antioxidant activity would allow the rational design of novel antioxidants. Here the origins of the antioxidant properties of ten natural products of the lignan family were studied in silico by calculating their thermochemical properties by using ROB3LYP/6-311++G(2df,2p)//B3LYP/6-311G(d,p) model chemistry. Three conditions were modelled: gas phase, ethanol and water solvents. The results allowed assigning the antioxidant activity to specific moieties and structural features of these compounds. It was found that the benzylic hydrogen atoms are the most likely to be abstracted to form radicals and hence define antioxidant properties in most of the studied compounds. The results also suggested that the most likely mechanism of HOO• radical scavenging differs by the key moiety: it is hydrogen atom transfer in case the benzylic C-H bonds, however it is proton coupled electron transfer in case of the compounds where O-H bonds are responsible for radical scavenging.
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26
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Cardullo N, Muccilli V, Saletti R, Giovando S, Tringali C. A mass spectrometry and 1H NMR study of hypoglycemic and antioxidant principles from a Castanea sativa tannin employed in oenology. Food Chem 2018; 268:585-593. [PMID: 30064801 DOI: 10.1016/j.foodchem.2018.06.117] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2018] [Revised: 06/21/2018] [Accepted: 06/23/2018] [Indexed: 01/04/2023]
Abstract
The ethanol extract of the commercial tannin Tan'Activ C, (from Castanea sativa wood), employed in oenology, was subjected to chromatography on XAD-16 affording fractions X1-X5, evaluated for total phenols content (GAE), antioxidant activity (DPPH, ORAC), and hypoglycemic activity (α-glucosidase inhibition). Fraction X3 showed GAE, radical scavenging activity, and α-glucosidase inhibition higher than those of the Castanea sativa extract, and was subjected to chromatography on Sephadex LH-20 to obtain fractions S1-S7, analyzed by HPLC/ESI-MS/MS and 1H NMR to identify the main active constituents. In fractions with higher antioxidant activity, gallic acid (4), grandinin (5), valoneic acid dilactone (9), 1,2,3-tri-O-galloyl-β-glucose (14), 3,4,6-tri-O-galloyl-β-glucose (15) and galloyl derivative of valoneic acid dilactone (21) were identified as the major constituents. The highest hypoglycemic activity was found in fractions S6 and especially S7; the major constituents of these fractions are valoneic acid dilactone (9), three tetragalloyl glucose isomers (16-18) and 1,2,3,4,6-penta-O-galloyl-β-glucose (23), previously reported as α-glucosidase inhibitors.
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Affiliation(s)
- Nunzio Cardullo
- Dipartimento di Scienze Chimiche, Università degli Studi di Catania, V.le A. Doria 6, 95125 Catania, Italy.
| | - Vera Muccilli
- Dipartimento di Scienze Chimiche, Università degli Studi di Catania, V.le A. Doria 6, 95125 Catania, Italy.
| | - Rosaria Saletti
- Dipartimento di Scienze Chimiche, Università degli Studi di Catania, V.le A. Doria 6, 95125 Catania, Italy.
| | - Samuele Giovando
- Centro Ricerche per la Chimica Fine Srl, Via Torre, 12080 San Michele Mondovì (CN), Italy.
| | - Corrado Tringali
- Dipartimento di Scienze Chimiche, Università degli Studi di Catania, V.le A. Doria 6, 95125 Catania, Italy.
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Maioli M, Basoli V, Carta P, Fabbri D, Dettori MA, Cruciani S, Serra PA, Delogu G. Synthesis of magnolol and honokiol derivatives and their effect against hepatocarcinoma cells. PLoS One 2018; 13:e0192178. [PMID: 29415009 PMCID: PMC5802897 DOI: 10.1371/journal.pone.0192178] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2017] [Accepted: 01/17/2018] [Indexed: 01/12/2023] Open
Abstract
The hepatocellular carcinoma is one of the most common malignant tumour with high level of mortality rate due to its rapid progression and high resistance to conventional chemotherapies. Thus, the search for novel therapeutic leads is of global interest. Herein, a small set of derivatives of magnolol 1 and honokiol 2, the main components of Magnolia grandiflora and Magnolia obovata, were evaluated in in vitro assay using tumoral hepatocytes. The pro-drug approach was applied as versatile strategy to the improve bioactivity of the compounds by careful transformation of the hydroxyl groups of magnolol 1 and honokiol 2 in suitable ester derivatives. Compounds 10 and 11 resulted to be more potent than the parental honokiol 2 at concentration down to 1 μM with complete viability of treated fibroblast cells up to concentrations of 80 μM. The combination of a butyrate ester and a bare phenol-OH group in the honokiol structure seemed to play a significant role in the antiproliferative activity identifying an interesting pharmacological clue against hepatocellular carcinoma.
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Affiliation(s)
- Margherita Maioli
- Department of Biomedical Sciences, University of Sassari, Sassari, Italy
- Laboratory of Molecular Biology and Stem Cell Engineering, National Institute of Biostructures and Biosystems, Bologna, Italy
- Institute of Neurogenetics and Neuropharmacology, National Research Council, Monserrato, Cagliari, Italy
- Centre for Developmental Biology and Reprogramming (CEDEBIOR), Department of Biomedical Sciences, University of Sassari, Sassari, Italy
| | - Valentina Basoli
- Department of Biomedical Sciences, University of Sassari, Sassari, Italy
- Department of Biotechnology, University of Natural Resources and Life Sciences Vienna, Vienna, Austria
| | - Paola Carta
- Institute of Biomolecular Chemistry, National Research Council, Sassari, Italy
| | - Davide Fabbri
- Institute of Biomolecular Chemistry, National Research Council, Sassari, Italy
| | | | - Sara Cruciani
- Department of Biomedical Sciences, University of Sassari, Sassari, Italy
- Laboratory of Molecular Biology and Stem Cell Engineering, National Institute of Biostructures and Biosystems, Bologna, Italy
| | - Pier Andrea Serra
- Centre for Developmental Biology and Reprogramming (CEDEBIOR), Department of Biomedical Sciences, University of Sassari, Sassari, Italy
- Department of Clinical and Experimental Medicine, University of Sassari, Sassari, Italy
| | - Giovanna Delogu
- Institute of Biomolecular Chemistry, National Research Council, Sassari, Italy
- * E-mail:
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