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Bushmeleva K, Vyshtakalyuk A, Terenzhev D, Belov T, Nikitin E, Zobov V. Aronia melanocarpa Flavonol Extract-Antiradical and Immunomodulating Activities Analysis. PLANTS (BASEL, SWITZERLAND) 2023; 12:2976. [PMID: 37631187 PMCID: PMC10458422 DOI: 10.3390/plants12162976] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2023] [Revised: 08/04/2023] [Accepted: 08/14/2023] [Indexed: 08/27/2023]
Abstract
The study of Aronia melanocarpa's (A. melanocarpa) biological activity is focused on obtaining the crude extract and separation of the flavonol compounds. The extraction and fractionation of A. melanocarpa fruits, followed by quantitative analysis, were accomplished using high-performance liquid chromatography and Darco G-60 filtering. This approach enabled the quantification of flavonoids within each fraction. The antioxidative, immunomodulating activities and cytotoxicity with respect to the lymphoblast cell line RPMI-1788 were studied. The flavonol extract of A. melanocarpa has been shown to have a high capacity to neutralize free DPPH and AAPH radicals in vitro. It also caused an accelerated 'respiratory burst' formation of neutrophils and an increase in the metabolic reserves of cells in rats exposed to cyclophosphamide. The reference solution (an equivalent quercetin-rutin blend) contributed to a decrease in lipid peroxidation, intensifying phagocytosis processes. The studied compounds demonstrated their low influence on the leukocyte blood profile in animals.
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Affiliation(s)
- Kseniya Bushmeleva
- A.E. Arbuzov Institute of Organic and Physical Chemistry, Kazan Scientific Center, Russian Academy of Sciences, Arbuzov Str. 8, Kazan 420088, Russia; (A.V.); (D.T.); (T.B.); (E.N.); (V.Z.)
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Bioactive Compounds (BACs): A Novel Approach to Treat and Prevent Cardiovascular Diseases. Curr Probl Cardiol 2023; 48:101664. [PMID: 36841315 DOI: 10.1016/j.cpcardiol.2023.101664] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2023] [Accepted: 02/17/2023] [Indexed: 02/26/2023]
Abstract
Cardiovascular diseases (CVDs) are one of the leading disorders of serious death and cause huge economic loss to patients and society. It is estimated that about 18 million people have a high death ratio due to the incidence of CVDs such as (stroke, coronary heart disease, and non-ischemic heart failure). Bioactive compounds (BACs) are healthy nutritional ingredients providing beneficial effects and nutritional value to the human body. Epidemiological studies strongly shed light on several bioactive compounds that are favorable candidates for CVDs treatment. Globally, the high risk of CVDs and related results on human body parts made them a serious scenario in all communities. In this present review, we intend to collect previously published data concerned over the years concerning green-colored foods and their BACs that aim to work in the prevention, diagnosis, and/or systematic treating CVDs. We also comprehensively discussed the oral delivery of several bioactive compounds derived from fruits and vegetables and their bioavailability and physiological effects on human health. Moreover, their important characteristics, such as anti-inflammatory, lowering blood pressure, anti-obesity, antioxidant, anti-diabetics, lipid-lowering responses, improving atherosclerosis, and cardioprotective properties, will be elaborated further. More precisely, medicinal plants' advantages and multifaceted applications have been reported in this literature to treat CVDs. To the best of our knowledge, this is our first attempt that will open a new window in the area of CVDs with the opportunity to achieve a better prognosis and effective treatment for CVDs.
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Jo S, Jung YS, Cho YR, Seo JW, Lim WC, Nam TG, Lim TG, Byun S. Oral Administration of Rosa gallica Prevents UVB-Induced Skin Aging through Targeting the c-Raf Signaling Axis. Antioxidants (Basel) 2021; 10:antiox10111663. [PMID: 34829534 PMCID: PMC8614869 DOI: 10.3390/antiox10111663] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Revised: 10/15/2021] [Accepted: 10/19/2021] [Indexed: 12/05/2022] Open
Abstract
Rosa gallica is a widely used Rosa species for medicinal and culinary purposes. Rosa gallica has been reported to display antioxidant, anti−inflammatory, and antibacterial activities. However, the effect of Rosa gallica against skin aging in vivo is unknown and its active components have not been fully understood. Oral administration of Rosa gallica prevented UVB−mediated skin wrinkle formation and loss of collagen/keratin fibers in the dorsal skin of mice. Examination of biomarkers at the molecular level showed that Rosa gallica downregulates UVB−induced COX−2 and MMP−1 expression in the skin. Through a direct comparison of major compounds identified using the UHPLC−MS/MS system, we discovered gallic acid as the primary component contributing to the anti-skin aging effect exhibited by Rosa gallica. Examination of the molecular mechanism revealed that gallic acid can potently and selectively target the c−Raf/MEK/ERK/c−Fos signaling axis. In addition, both gallic acid and MEK inhibitor blocked UVB−induced MMP−1 expression and restored collagen levels in a reconstructed 3D human skin model. Collectively, Rosa gallica could be used as a functional ingredient in the development of nutraceuticals against skin aging.
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Affiliation(s)
- Seongin Jo
- Department of Biotechnology, Yonsei University, Seoul 03722, Korea; (S.J.); (Y.-R.C.)
| | - Young-Sung Jung
- Korea Food Research Institute, Wanju-gun 55365, Korea; (Y.-S.J.); (W.-C.L.)
| | - Ye-Ryeong Cho
- Department of Biotechnology, Yonsei University, Seoul 03722, Korea; (S.J.); (Y.-R.C.)
| | - Ji-Won Seo
- Department of Agricultural Biotechnology and Research, Institute of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Korea;
| | - Won-Chul Lim
- Korea Food Research Institute, Wanju-gun 55365, Korea; (Y.-S.J.); (W.-C.L.)
| | - Tae-Gyu Nam
- Major of Food Science and Biotechnology, Division of Bio-Convergence, Kyonggi University, Suwon 16227, Korea;
| | - Tae-Gyu Lim
- Korea Food Research Institute, Wanju-gun 55365, Korea; (Y.-S.J.); (W.-C.L.)
- Department of Food Science & Biotechnology, Sejong University, Seoul 05006, Korea
- Correspondence: (T.-G.L.); (S.B.); Tel.: +82-2-3408-3260 (T.-G.L.); +82-2-2123-5896 (S.B.)
| | - Sanguine Byun
- Department of Biotechnology, Yonsei University, Seoul 03722, Korea; (S.J.); (Y.-R.C.)
- Correspondence: (T.-G.L.); (S.B.); Tel.: +82-2-3408-3260 (T.-G.L.); +82-2-2123-5896 (S.B.)
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Calliari CM, Campardelli R, Pettinato M, Perego P. Encapsulation of
Hibiscus sabdariffa
Extract into Zein Nanoparticles. Chem Eng Technol 2020. [DOI: 10.1002/ceat.202000194] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Caroline Maria Calliari
- Universidade Tecnológica Federal do Paraná Departamento Acadêmico de Alimentos Avenida dos Pioneiros 3131 86036-370 Londrina (PR) Brazil
| | - Roberta Campardelli
- University of Genoa Department of Civil, Chemical and Environmental Engineering Via Opera Pia 15 6145 Genova Italy
| | - Margherita Pettinato
- University of Genoa Department of Civil, Chemical and Environmental Engineering Via Opera Pia 15 6145 Genova Italy
| | - Patrizia Perego
- University of Genoa Department of Civil, Chemical and Environmental Engineering Via Opera Pia 15 6145 Genova Italy
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Pérez-Manríquez J, Escalona N, Pérez-Correa J. Bioactive Compounds of the PVPP Brewery Waste Stream and their Pharmacological Effects. MINI-REV ORG CHEM 2020. [DOI: 10.2174/1570193x16666190723112623] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Beer, one of the most commonly consumed alcoholic beverages, is rich in polyphenols
and is the main dietary source of xanthohumol and related prenylflavonoids. However, to avoid haze
formation caused by the interaction between polyphenols and proteins, most phenolic compounds are
removed from beer and lost in the brewery waste stream via polyvinylpolypyrrolidone (PVPP)
adsorption. This waste stream contains several polyphenols with high antioxidant capacity and pharmacological
effects; that waste could be used as a rich, low-cost source of these compounds, though
little is known about its composition and potential attributes. This work aims to review the polyphenols
present in this brewery waste stream, as well as the health benefits associated with their consumption.
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Affiliation(s)
- J. Pérez-Manríquez
- Department of Chemical and Bioprocess Engineering, School of Engineering, Pontificia Universidad Catolica de Chile, Vicuna Mackenna 4860, Macul, Santiago, Chile
| | - N. Escalona
- Department of Chemical and Bioprocess Engineering, School of Engineering, Pontificia Universidad Catolica de Chile, Vicuna Mackenna 4860, Macul, Santiago, Chile
| | - J.R. Pérez-Correa
- Department of Chemical and Bioprocess Engineering, School of Engineering, Pontificia Universidad Catolica de Chile, Vicuna Mackenna 4860, Macul, Santiago, Chile
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Sedighi M, Bahmani M, Asgary S, Beyranvand F, Rafieian-Kopaei M. A review of plant-based compounds and medicinal plants effective on atherosclerosis. JOURNAL OF RESEARCH IN MEDICAL SCIENCES : THE OFFICIAL JOURNAL OF ISFAHAN UNIVERSITY OF MEDICAL SCIENCES 2017; 22:30. [PMID: 28461816 PMCID: PMC5390544 DOI: 10.4103/1735-1995.202151] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/27/2016] [Revised: 11/12/2016] [Accepted: 12/20/2016] [Indexed: 01/09/2023]
Abstract
Atherosclerosis is one of the most important cardiovascular diseases that involve vessels through the development of fatty streaks and plaques. Plant-based compounds can help treat or prevent atherosclerosis through affecting the involved factors. The main purpose of this review article is to investigate and introduce medicinal plants and their potential activities regarding antioxidant properties, effective on lipids level and development of plaque, atherosclerosis, and progression of atherosclerosis as well as the development of cardiovascular disease and ischemia. To search for the relevant articles indexed in Information Sciences Institute, PubMed, Scientific Information Database, IranMedex, and Scopus between 1980 and 2013, with further emphasis on those indexed from 2004 to 2015, we used these search terms: atherosclerosis, antioxidant, cholesterol, inflammation, and the medicinal plants below. Then, the articles with inclusion criteria were used in the final analysis of the findings. Plant-based active compounds, including phenols, flavonoids, and antioxidants, can be effective on atherosclerosis predisposing factors and hence in preventing this disease and associated harmful complications, especially through reducing cholesterol, preventing increase in free radicals, and ultimately decreasing vascular plaque and vascular resistance. Hence, medicinal plants can contribute to treating atherosclerosis and preventing its progression through reducing cholesterolemia, free radicals, inflammation, vascular resistance, and certain enzymes. They, alone or in combination with hypocholesterolemic drugs, can therefore be useful for patients with hyperlipidemia and its complications.
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Affiliation(s)
- Mehrnoosh Sedighi
- Razi Herbal Medicines Research Center, Lorestan University of Medical Sciences, Khorramabad, Iran
| | - Mahmoud Bahmani
- Razi Herbal Medicines Research Center, Lorestan University of Medical Sciences, Khorramabad, Iran
- Biotechnology and Medicinal Plants Research Center, Ilam University of Medical Sciences, Ilam, Iran
| | - Sedigheh Asgary
- Isfahan Cardiovascular Research Center, Cardiovascular Research Institute, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Fatemeh Beyranvand
- Razi Herbal Medicines Research Center, Lorestan University of Medical Sciences, Khorramabad, Iran
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Hoang MH, Jia Y, Mok B, Jun HJ, Hwang KY, Lee SJ. Kaempferol ameliorates symptoms of metabolic syndrome by regulating activities of liver X receptor-β. J Nutr Biochem 2015; 26:868-75. [PMID: 25959373 DOI: 10.1016/j.jnutbio.2015.03.005] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2014] [Revised: 03/17/2015] [Accepted: 03/24/2015] [Indexed: 10/23/2022]
Abstract
Kaempferol is a dietary flavonol previously shown to regulate cellular lipid and glucose metabolism. However, its molecular mechanisms of action and target proteins have remained elusive, probably due to the involvement of multiple proteins. This study investigated the molecular targets of kaempferol. Ligand binding of kaempferol to liver X receptors (LXRs) was quantified by time-resolved fluorescence resonance energy transfer and surface plasmon resonance analyses. Kaempferol directly binds to and induces the transactivation of LXRs, with stronger specificity for the β-subtype (EC50 = 0.33 μM). The oral administration of kaempferol in apolipoprotein-E-deficient mice (150 mg/day/kg body weight) significantly reduced plasma glucose and increased high-density lipoprotein cholesterol levels and insulin sensitivity compared with the vehicle-fed control. Kaempferol also reduced plasma triglyceride concentrations and did not cause liver steatosis, a common side effect of potent LXR activation. In immunoblotting analysis, kaempferol reduced the nuclear accumulation of sterol regulatory element-binding protein-1 (SREBP-1). Our results show that the suppression of SREBP-1 activity and the selectivity for LXR-β over LXR-α by kaempferol contribute to the reductions of plasma and hepatic triglyceride concentrations in mice fed kaempferol. They also suggest that kaempferol activates LXR-β and suppresses SREBP-1 to enhance symptoms in metabolic syndrome.
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Affiliation(s)
- Minh-Hien Hoang
- Department of Biotechnology, Graduate School of Life Sciences and Biotechnology, Korea University, Seoul 136-713, Republic of Korea; Department of Food Bioscience and Technology, College of Life Sciences and Technology, Korea University, Seoul 136-713, Republic of Korea
| | - Yaoyao Jia
- Department of Biotechnology, Graduate School of Life Sciences and Biotechnology, Korea University, Seoul 136-713, Republic of Korea; Department of Food Bioscience and Technology, College of Life Sciences and Technology, Korea University, Seoul 136-713, Republic of Korea
| | - Boram Mok
- Department of Biotechnology, Graduate School of Life Sciences and Biotechnology, Korea University, Seoul 136-713, Republic of Korea; Department of Food Bioscience and Technology, College of Life Sciences and Technology, Korea University, Seoul 136-713, Republic of Korea
| | - Hee-jin Jun
- Life Science Institute, Department of Molecular and Integrative Physiology, University of Michigan Medical School, Ann Arbor, MI 48109, USA
| | - Kwang-Yeon Hwang
- Division of Biotechnology, College of Life Sciences and Technology, Korea University, Seoul 136-713, Republic of Korea
| | - Sung-Joon Lee
- Department of Biotechnology, Graduate School of Life Sciences and Biotechnology, Korea University, Seoul 136-713, Republic of Korea; Department of Food Bioscience and Technology, College of Life Sciences and Technology, Korea University, Seoul 136-713, Republic of Korea.
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Gibis M, Zeeb B, Weiss J. Formation, characterization, and stability of encapsulated hibiscus extract in multilayered liposomes. Food Hydrocoll 2014. [DOI: 10.1016/j.foodhyd.2013.11.014] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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In vitro study on the antioxidant potentials of the leaves and fruits of Nauclea latifolia. ScientificWorldJournal 2014; 2014:437081. [PMID: 25013856 PMCID: PMC4074996 DOI: 10.1155/2014/437081] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2014] [Revised: 05/13/2014] [Accepted: 05/19/2014] [Indexed: 01/11/2023] Open
Abstract
This study was carried out to investigate the in vitro antioxidant potentials of the leaves and fruits of Nauclea latifolia, a straggling shrub or small tree, native to tropical Africa and Asia. Hot water extracts of the leaves and fruits of Nauclea latifolia were assessed for their total polyphenolic, flavanol, and flavonol contents as well as 1-diphenyl-2-picrylhydrazyl (DPPH) scavenging ability, ferric reducing antioxidant power (FRAP), Trolox equivalence antioxidant capacity (TEAC), and oxygen radical absorbance capacity (ORAC) assays. The aqueous extract of the leaves was found to contain higher level of total polyphenols (11.63 ± 0.023 mg GAE/g), flavanol (1.45 ± 0.10 mg CE/g), and flavonol (2.22 ± 0.37 mg QE/g) than the extract of the fruits with values of 1.75 ± 0.02 mg GAE/g (total polyphenol), 0.15 ± 0.01 mg CE/g (flavanol), and 1.00 ± 0.13 mg QE/g (flavonol). Similarly, the aqueous extract of the leaves also exhibited higher DPPH (IC50 20.64 mg/mL), FRAP (86.10 ± 3.46 μmol AAE/g), TEAC (94.83 ± 3.57 μmol TE/g), and ORAC (196.55 ± 0.073 μmol TE/g) than the extract of the fruits with DPPH (IC50 120.33 mg/mL), FRAP (12.23 ± 0.40 μmol AAE/g), TEAC (12.48 ± 0.21 μmol TE/g), and ORAC (58.88 ± 0.073 μmol TE/g). The present study showed that Nauclea latifolia has strong antioxidant potentials with the leaves demonstrating higher in vitro antioxidant activities than the fruits.
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10
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Effect of black and red cabbage on plasma carotenoid levels, lipid profile and oxidized low density lipoprotein. J Funct Foods 2014. [DOI: 10.1016/j.jff.2014.02.020] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
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Zhang LJ, Yeh SF, Yu YT, Kuo LMY, Kuo YH. Antioxidative Flavonol Glucuronides and Anti-HBsAg Flavonol from Rotala rotundifolia. J Tradit Complement Med 2014; 1:57-63. [PMID: 24716106 PMCID: PMC3943002 DOI: 10.1016/s2225-4110(16)30057-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022] Open
Abstract
Two new flavonol glucuronides, quercetin 3-O-β-D-2″-acetylglucuronide (1) and quercetin 3-O-β-D-2″-acetylglucuronide methyl ester (2), along with four known flavonoids (3-6) were isolated from the whole parts of Rotala rotundifolia. The structures of 1 and 2 were elucidated by application of various spectroscopic methods, including 1D and 2D NMR techniques. Biological evaluation showed that all of isolated flavonoid compounds have potent anti-oxidative activities by DPPH and superoxide anion methods, and kaempferol (3) and quercetin (4) exhibited significant anti-HBV activity assayed by anti-HBsAg production. The HPLC fingerprint with photodiode array detection (HPLC-DAD) for quality control of R. rotundifolia partitioned EtOAc layer was also established.
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Affiliation(s)
- Li-Jie Zhang
- National Research Institute of Chinese Medicine, Taipei 112, Taiwan
| | - Sheau-Farn Yeh
- Institute of Biochemistry and Molecular Biology, National Yang-ming University, Taipei, 112, Taiwan
| | - Ya-Ten Yu
- National Research Institute of Chinese Medicine, Taipei 112, Taiwan
| | - Li-Ming Yang Kuo
- School of Pharmacy, Taipei Medical University, Taipei, 110, Taiwan
| | - Yao-Haur Kuo
- National Research Institute of Chinese Medicine, Taipei 112, Taiwan ; The Graduate Institute of Integrated Medicine, China Medical University, Taichung, 404, Taiwan
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Masek A, Chrzescijanska E, Zaborski M. Electrooxidation of morin hydrate at a Pt electrode studied by cyclic voltammetry. Food Chem 2014; 148:18-23. [DOI: 10.1016/j.foodchem.2013.10.003] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2012] [Revised: 09/23/2013] [Accepted: 10/01/2013] [Indexed: 01/18/2023]
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Phenolic composition, DNA damage protective activity and hepatoprotective effect of free phenolic extract from Sphallerocarpus gracilis seeds. Int Immunopharmacol 2014; 20:238-47. [PMID: 24657314 DOI: 10.1016/j.intimp.2014.03.002] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2013] [Revised: 02/26/2014] [Accepted: 03/07/2014] [Indexed: 11/22/2022]
Abstract
The phenolic composition of the free phenolic extract from Sphallerocarpus gracilis seeds was analyzed by HPLC-MS and predominant compounds were chlorogenic acid, di-caffeoylquinic acid glucoside and luteolin-7-O-glucoside. The free phenolic extract was evaluated for DNA damage protective activity induced by ROO and OH radicals and hepatoprotective effect in vivo and in vitro. Results revealed that the free phenolic extract exhibited significant protective activity against both ROO and OH radical-induced DNA damage and the phenolic extract exerted more potent inhibitory activity against OH radical-induced damage than against that induced by ROO radicals. In vivo experimental results showed that the phenolic extract significantly prevented the increase of serum alanine aminotransferase, aspartate aminotransferase and alkaline phosphatase activities and hepatic malondialdehyde level caused by CCl4 in rats, and markedly increased hepatic superoxide dismutase, catalase and glutathione peroxidase levels. Histopathological examinations further confirmed that the phenolic extract could protect the liver from CCl4-induced damage. In vitro experimental results showed that the phenolic extract could reduce BRL hepatocyte apoptosis and damage induced by CCl4. These findings indicate that the S. gracilis seed could be developed as a medicinal herb for the therapy and prevention of hepatic injury.
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Chan KC, Yang MY, Lin MC, Lee YJ, Chang WC, Wang CJ. Mulberry leaf extract inhibits the development of atherosclerosis in cholesterol-fed rabbits and in cultured aortic vascular smooth muscle cells. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2013; 61:2780-2788. [PMID: 23428158 DOI: 10.1021/jf305328d] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
This study used high-cholesterol-fed New Zealand white rabbits and aortic vascular smooth muscle cells (VSMCs) to investigate the impact of mulberry leaf extract (MLE) on the development of atherosclerosis. The results show that the major components of MLE are polyphenols, flavonoids, carbohydrates, proteins, and lipids, and the major contituents of mulberry leaf polyphenol extract (MLPE) are polyphenols and flavonoids. In addition to improvement of liver function, the atheroma burden and levels of serum cholesterol, triglycerides, and low-density lipoprotein (LDL) are also significantly reduced after MLE treatment. MLE and MLPE improved endothelial function, inhibited proliferation and migration of aortic VSMCs, and reduced atheromas in the vascular wall. In conclusion, this study demonstrates that, in addition to exerting hypolipidemic effects, MLE and MLPE can effectively inhibit proliferation and migration of aortic VSMCs, improve vascular endothelial function, and reduce atheroma burden, thereby preventing atherosclerosis.
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Affiliation(s)
- Kuei-Chuan Chan
- Department of Internal Medicine, Chung-Shan Medical University Hospital , No. 110, Sec. 1, Jianguo N. Road, Taichung 402, Taiwan
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Zhang NN, Park DK, Park HJ. Hair growth-promoting activity of hot water extract of Thuja orientalis. Altern Ther Health Med 2013; 13:9. [PMID: 23305186 PMCID: PMC3637267 DOI: 10.1186/1472-6882-13-9] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2012] [Accepted: 12/19/2012] [Indexed: 11/10/2022]
Abstract
BACKGROUND Thuja orientalis has been traditionally used to treat patients who suffer from baldness and hair loss in East Asia. The present study sought to investigate the hair growth-promoting activity of T. orientalis hot water extract and the underlying mechanism of action. METHODS After T. orientalis extract was topically applied to the shaved dorsal skin of telogenic C57BL/6 N mice, the histomorphometric analysis was employed to study induction of the hair follicle cycle. To determine the effect of T. orientalis extract on the telogen to anagen transition, the protein expression levels of β-catenin and Sonic hedgehog (Shh) in hair follicles were determined by immunohistochemistry. RESULTS We observed that T. orientalis extract promoted hair growth by inducing the anagen phase in telogenic C57BL/6 N mice. Specifically, the histomorphometric analysis data indicates that topical application of T. orientalis extract induced an earlier anagen phase and prolonged the mature anagen phase, in contrast to either the control or 1% minoxidil-treated group. We also observed increases in both the number and size of hair follicles of the T. orientalis extract-treated group. Moreover, the immunohistochemical analysis reveals earlier induction of β-catenin and Shh proteins in hair follicles of the T. orientalis extract-treated group, compared to the control or 1% minoxidil-treated group. CONCLUSION These results suggest that T. orientalis extract promotes hair growth by inducing the anagen phase in resting hair follicles and might therefore be a potential hair growth-promoting agent.
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Fadda AA, El-Mekawy RE, El-Shafei AI, Freeman H. Synthesis and Pharmacological Screening of Novelmeso-Substituted Porphyrin Analogs. Arch Pharm (Weinheim) 2012; 346:53-61. [DOI: 10.1002/ardp.201200313] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2012] [Revised: 09/19/2012] [Accepted: 09/26/2012] [Indexed: 02/01/2023]
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Thilakarathna SH, Rupasinghe HPV, Needs PW. Apple peel bioactive rich extracts effectively inhibit in vitro human LDL cholesterol oxidation. Food Chem 2012; 138:463-70. [PMID: 23265512 DOI: 10.1016/j.foodchem.2012.09.121] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2012] [Revised: 08/29/2012] [Accepted: 09/24/2012] [Indexed: 01/13/2023]
Abstract
Apple peels are rich in antioxidant bioactives and hence can possess the ability to inhibit human low density lipoprotein cholesterol (LDL-C) oxidation. LDL-C oxidation is known to initiate atherosclerotic plaque formation. Unique quercetin-rich (QAE) and triterpene-rich (TAE) apple peel extracts, their constituent compounds and three in vivo quercetin metabolites were investigated for in vitro LDL-C oxidation inhibition. Both extracts effectively inhibited Cu(2+)-induced LDL-C oxidation. IC(50) of QAE and TAE for LDL-C oxidation products were 0.06-8.29 mg/L and 29.58-95.49 mg/L, respectively. Quercetin compounds, chlorogenic acid and phloridzin could contribute more to the effectiveness of QAE at physiological concentrations. The three in vivo quercetin metabolites; quercetin-3'-sulfate, quercetin-3-glucuronic acid and isorhamnetin-3-glucuronic acid were effective at physiological concentrations and therefore, QAE can be effective in LDL-C oxidation inhibition under physiological conditions. Constituent TAE compounds did not perform well under Cu(2+)-induction. Overall, both extracts effectively inhibited LDL-C oxidation in vitro.
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Affiliation(s)
- Surangi H Thilakarathna
- Department of Environmental Sciences, Faculty of Agriculture, Dalhousie University, P.O. Box 550, Truro, Nova Scotia, Canada B2N 5E3
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Soler-Cantero A, Jové M, Cacabelos D, Boada J, Naudí A, Romero MP, Cassanyé A, Serrano JCE, Arola L, Valls J, Bellmunt MJ, Prat J, Pamplona R, Portero-Otin M, Motilva MJ. Plant-derived phenolics inhibit the accrual of structurally characterised protein and lipid oxidative modifications. PLoS One 2012; 7:e43308. [PMID: 22952663 PMCID: PMC3430685 DOI: 10.1371/journal.pone.0043308] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2012] [Accepted: 07/23/2012] [Indexed: 11/18/2022] Open
Abstract
Epidemiological data suggest that plant-derived phenolics beneficial effects include an inhibition of LDL oxidation. After applying a screening method based on 2,4-dinitrophenyl hydrazine-protein carbonyl reaction to 21 different plant-derived phenolic acids, we selected the most antioxidant ones. Their effect was assessed in 5 different oxidation systems, as well as in other model proteins. Mass-spectrometry was then used, evidencing a heterogeneous effect on the accumulation of the structurally characterized protein carbonyl glutamic and aminoadipic semialdehydes as well as for malondialdehyde-lysine in LDL apoprotein. After TOF based lipidomics, we identified the most abundant differential lipids in Cu(++)-incubated LDL as 1-palmitoyllysophosphatidylcholine and 1-stearoyl-sn-glycero-3-phosphocholine. Most of selected phenolic compounds prevented the accumulation of those phospholipids and the cellular impairment induced by oxidized LDL. Finally, to validate these effects in vivo, we evaluated the effect of the intake of a phenolic-enriched extract in plasma protein and lipid modifications in a well-established model of atherosclerosis (diet-induced hypercholesterolemia in hamsters). This showed that a dietary supplement with a phenolic-enriched extract diminished plasma protein oxidative and lipid damage. Globally, these data show structural basis of antioxidant properties of plant-derived phenolic acids in protein oxidation that may be relevant for the health-promoting effects of its dietary intake.
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Affiliation(s)
- Arantza Soler-Cantero
- Departament of Food Technology, CeRTA-TPV, Escola Tècnica Superior d′ Enginyeria Agrària, Universitat de Lleida, Lleida, Spain
| | - Mariona Jové
- NUTREN-Nutrigenomics Center, Department of Experimental Medicine, Parc Científic i Tecnològic Agroalimentari de Lleida-Universitat de Lleida-IRBLLEIDA, Lleida, Spain
| | - Daniel Cacabelos
- NUTREN-Nutrigenomics Center, Department of Experimental Medicine, Parc Científic i Tecnològic Agroalimentari de Lleida-Universitat de Lleida-IRBLLEIDA, Lleida, Spain
| | - Jordi Boada
- NUTREN-Nutrigenomics Center, Department of Experimental Medicine, Parc Científic i Tecnològic Agroalimentari de Lleida-Universitat de Lleida-IRBLLEIDA, Lleida, Spain
| | - Alba Naudí
- NUTREN-Nutrigenomics Center, Department of Experimental Medicine, Parc Científic i Tecnològic Agroalimentari de Lleida-Universitat de Lleida-IRBLLEIDA, Lleida, Spain
| | - Maria-Paz Romero
- Departament of Food Technology, CeRTA-TPV, Escola Tècnica Superior d′ Enginyeria Agrària, Universitat de Lleida, Lleida, Spain
| | - Anna Cassanyé
- NUTREN-Nutrigenomics Center, Department of Experimental Medicine, Parc Científic i Tecnològic Agroalimentari de Lleida-Universitat de Lleida-IRBLLEIDA, Lleida, Spain
| | - José C. E. Serrano
- NUTREN-Nutrigenomics Center, Department of Experimental Medicine, Parc Científic i Tecnològic Agroalimentari de Lleida-Universitat de Lleida-IRBLLEIDA, Lleida, Spain
| | - Lluis Arola
- Department of Biochemistry and Biotechnology, Nutrigenomic Research Group, Universitat Rovira i Virgili, Tarragona, Spain
| | | | - Maria Josep Bellmunt
- NUTREN-Nutrigenomics Center, Department of Experimental Medicine, Parc Científic i Tecnològic Agroalimentari de Lleida-Universitat de Lleida-IRBLLEIDA, Lleida, Spain
| | - Joan Prat
- NUTREN-Nutrigenomics Center, Department of Experimental Medicine, Parc Científic i Tecnològic Agroalimentari de Lleida-Universitat de Lleida-IRBLLEIDA, Lleida, Spain
| | - Reinald Pamplona
- NUTREN-Nutrigenomics Center, Department of Experimental Medicine, Parc Científic i Tecnològic Agroalimentari de Lleida-Universitat de Lleida-IRBLLEIDA, Lleida, Spain
| | - Manuel Portero-Otin
- NUTREN-Nutrigenomics Center, Department of Experimental Medicine, Parc Científic i Tecnològic Agroalimentari de Lleida-Universitat de Lleida-IRBLLEIDA, Lleida, Spain
- * E-mail: (MPO); (MJM)
| | - Maria-José Motilva
- Departament of Food Technology, CeRTA-TPV, Escola Tècnica Superior d′ Enginyeria Agrària, Universitat de Lleida, Lleida, Spain
- * E-mail: (MPO); (MJM)
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Chen W, Zhang C, Huang Y, Cheng F, Shen Y, Wang R, Tang M, Zheng Y, Zhao S. The inhibiting activity of areca inflorescence extracts on human low density lipoprotein oxidation induced by cupric ion. Int J Food Sci Nutr 2011; 63:236-41. [DOI: 10.3109/09637486.2011.620946] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Dai F, Chen WF, Zhou B, Yang L, Liu ZL. Antioxidative effects of curcumin and its analogues against the free-radical-induced peroxidation of linoleic acid in micelles. Phytother Res 2011; 23:1220-8. [PMID: 19173279 DOI: 10.1002/ptr.2517] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Curcumin (1,7-bis(4-hydroxy-3-methoxyphenyl)-1,6-heptadiene-3,5-dione, 1) is a yellow ingredient isolated from turmeric (curcumin longa). Many health benefits have been claimed for curcumin, and these have generally been ascribed to its radical-trapping antioxidant properties. In order to find more active antioxidants with 1 as the lead compound, we synthesized curcumin analogues, i.e., 1,7-bis(3,4-dihydroxyphenyl)-1,6-heptadiene-3,5-dione (2), 1-(3,4-dihydroxyphenyl)-7-(4-hydroxy-3-methoxyphenyl)-1,6-heptadiene-3,5-dione (3), 1-(4-hydroxy-3-methoxyphenyl)-7-(4-hydroxyphenyl)-1,6-heptadiene-3,5-dione (4), 1,7-bis (4-hydroxyphenyl)-1,6-heptadiene-3,5-dione (5), 1,7-bis(3,4-dimethoxyphenyl)-1,6-heptadiene-3,5-dione (6), 1,7-bis(4-methoxyphenyl)-1,6-heptadiene-3,5-dione (7), and 1,7-diphenyl-1,6-heptadiene-3,5-dione (8). Antioxidative effects of curcumin and these analogues against the peroxidation of linoleic acid were studied in sodium dodecyl sulfate (SDS) and cetyltrimethylammonium bromide (CTAB) micelles. The peroxidation was initiated thermally by a water-soluble initiator 2,2'-azobis(2-amidinopropane hydrochloride) (AAPH), and reaction kinetics were monitored by the formation of linoleic acid hydroperoxides. Kinetic analysis of the antioxidation process demonstrates that these compounds, except 6, 7 and 8, are effective antioxidants in micelles by H-atom abstraction from the phenolic groups. Compounds 2 and 3, which bear ortho-diphenoxyl functionality, possess significantly higher antioxidant activity than curcumin and other analogues, and the 4-hydroxy-3-methoxyphenyl group also plays an important role in the antioxidative activity. In addition, the synergistic antioxidant effect of these compounds with alpha-tocopherol (vitamin E) in micelles was also studied by following the formation of linoleic acid hydroperoxides and the consumption of alpha-tocopherol. It was found that these compounds could not synergistically interact with alpha-tocopherol in micelles.
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Affiliation(s)
- Fang Dai
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou, Gansu 730000, China
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Lue BM, Nielsen NS, Jacobsen C, Hellgren L, Guo Z, Xu X. Antioxidant properties of modified rutin esters by DPPH, reducing power, iron chelation and human low density lipoprotein assays. Food Chem 2010. [DOI: 10.1016/j.foodchem.2010.04.009] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Ren G, Qiao HX, Yang J, Zhou CX. Protective effects of steroids from Allium chinense against H2O2-induced oxidative stress in rat cardiac H9C2 cells. Phytother Res 2010; 24:404-9. [PMID: 19653197 DOI: 10.1002/ptr.2964] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Allium chinense, a traditional herbal medicine, has been used for the treatment of cardiovascular diseases for hundreds of years. In this study, A. chinense steroids (ACSs) including three steroidal glycosides and their parent aglycones were isolated from the bulbs of A. chinense. For the first time, their cardioprotective effects were evaluated in cultured rat cardiac H9C2 cells by pretreatment with ACSs for 24 h before exposure to 0.2 mm H(2)O(2). The results showed the cell viability decreased markedly when H9C2 cells were incubated with 0.2 mm H(2)O(2) alone for 2 h, while the cell lipid peroxidation (estimated by the excessive production of nitric oxide and malondialdehyde) and intracellular free calcium concentration ([Ca(2+)](i)) increased significantly. The addition of 20 microm (below the toxic concentration) of ACSs notably attenuated the cellular injury induced by H(2)O(2). The effects of ACSs in our experiments were similar to those of nimodipine, a clinically applied calcium channel blocker. Preliminary analysis of the structure-activity relationship indicated that ACSs with a spirostane-type skeleton exhibited stronger protection than that with a furostane-type skeleton, and glycosylation of the steroids could substantially lower the protective activities. The above results suggested the protective effects of steroids originated from A. chinense on the oxidative injury of H9C2 cells and ACSs may have potential for preventing cardiac injuries induced by oxidative stress.
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Affiliation(s)
- Gang Ren
- Institute of Modern Chinese Herb Medicine, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, China
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24
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Nones J, Stipursky J, Costa SL, Gomes FCA. Flavonoids and Astrocytes Crosstalking: Implications for Brain Development and Pathology. Neurochem Res 2010; 35:955-66. [DOI: 10.1007/s11064-010-0144-0] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/18/2010] [Indexed: 11/28/2022]
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25
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Shanely RA, Knab AM, Nieman DC, Jin F, McAnulty SR, Landram MJ. Quercetin supplementation does not alter antioxidant status in humans. Free Radic Res 2009; 44:224-31. [DOI: 10.3109/10715760903407293] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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26
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Lin HY, Kuo YH, Lin YL, Chiang W. Antioxidative effect and active components from leaves of Lotus ( Nelumbo nucifera ). JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2009; 57:6623-6629. [PMID: 19572539 DOI: 10.1021/jf900950z] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The DPPH scavenging effect, the inhibition of human low-density lipoprotein oxidation, and antioxidative contents were employed for the activity-guided purification to identify the antioxidant components of lotus leaves (leaves of Nelumbo nucifera Gaertn.). The methanolic extract of lotus leaves (LLM) was separated into ethyl acetate (LLME), n-butanol (LLMB), and water (LLMW) fractions. LLME and LLMB exhibited greater capacity to scavenge DPPH radical, delayed LDL oxidation, and had higher antioxidative contents than LLMW. Seven flavonoids were isolated from both fractions by column chromatography. On the basis of 1D- and 2D-NMR experiments and MS data analyses, these compounds were identified as catechin (1), quercetin (2), quercetin-3-O-glucopyranoside (3), quercetin-3-O-glucuronide (4), quercetin-3-O-galactopyranoside (5), kaempferol-3-O-glucopyranoside (6), and myricetin-3-O-glucopyranoside (7). Quercetin and its glycosides (compounds 2-5) exerted potent inhibition of LDL oxidation, whereas myricetin-3-O-glucopyranoside (7) showed stronger DPPH scavenging activity. These results indicate that the antioxidant capacity of lotus leaves is partially relevant to its flavonoids.
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Affiliation(s)
- Hong-Yu Lin
- Graduate Institute of Food Science and Technology, Center for Food and Biomolecules, College of Bioresources and Agriculture, National Taiwan University, Taipei 106, Taiwan
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27
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Yeh SL, Wang HM, Chen PY, Wu TC. Interactions of β-carotene and flavonoids on the secretion of pro-inflammatory mediators in an in vitro system. Chem Biol Interact 2009; 179:386-93. [DOI: 10.1016/j.cbi.2008.12.006] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2008] [Revised: 12/05/2008] [Accepted: 12/08/2008] [Indexed: 11/16/2022]
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28
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Kgomotso T, Chiu F, Ng K. Genistein- and daidzein 7-O-β-D-glucuronic acid retain the ability to inhibit copper-mediated lipid oxidation of low density lipoprotein. Mol Nutr Food Res 2008; 52:1457-66. [DOI: 10.1002/mnfr.200800010] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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29
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Spanou C, Bourou G, Dervishi A, Aligiannis N, Angelis A, Komiotis D, Skaltsounis AL, Kouretas D. Antioxidant and chemopreventive properties of polyphenolic compounds derived from Greek legume plant extracts. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2008; 56:6967-6976. [PMID: 18636687 DOI: 10.1021/jf800842p] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Recently, phytochemical compounds present in legumes have gained a lot of interest because they are considered to be possible chemopreventive agents. In the present study, 14 polyphenolic compounds were extracted and identified from two unique varieties of Leguminosae family plants cultivated in Greece and screened for their antioxidant and chemopreventive properties. Ten polyphenolic fractions, which are mainly mixtures of two compounds and five pure flavonoids, were isolated from the methanolic extracts of aerial plant parts of Vicia faba and Lotus edulis (Leguminosae), respectively. All of these fractions exhibited significant DPPH(*) radical scavenging capacity. Furthermore, they exerted significant protective activity against free radical-induced DNA damage. This activity was more potent against ROO(*) radical-induced DNA damage than against that induced by OH(*) radicals. Finally, they exhibited significant ability to inhibit the activity of the topoisomerase I enzyme. These results imply that the polyphenolic compounds identified in the fractions were responsible of the observed properties of the fractions and the initial extracts and indicate different mechanisms by which these phenolic compounds may act as chemopreventive agents.
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Affiliation(s)
- Chrysoula Spanou
- Department of Biochemistry and Biotechnology, University of Thessaly, Ploutonos 26 & Aiolou, GR-41221 Larissa, Greece
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Effects of apigenin, lycopene and astaxanthin on 7β-hydroxycholesterol-induced apoptosis and Akt phosphorylation in U937 cells. Br J Nutr 2008; 100:287-96. [DOI: 10.1017/s0007114507898643] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Oxysterols arise from the enzymic or non-enzymic oxidation of cholesterol and have been shown to be cytotoxic to certain cell lines. In particular, apoptosis induced by the oxysterol 7β-hydroxycholesterol (7β-OH) has been associated with the generation of oxidative stress, cytochrome c release and caspase activation. Due to the fundamental importance of apoptosis in pathological processes, the identification of substances capable of modulating this form of cell death is now actively researched. The objective of the present study was to investigate if apigenin, lycopene and astaxanthin could inhibit 7β-OH-induced apoptosis in U937 cells. Pretreatment with 0·1 μm-astaxanthin protected against apoptosis, while lycopene did not oppose the adverse effects of 7β-OH. At low concentrations, apigenin did not protect against oxysterol-induced apoptosis; however, at higher concentrations it intensified cell death. Additionally, we investigated the effect of 7β-OH, apigenin and astaxanthin on the activation of the serine threonine kinase Akt (phosphorylated Akt:Akt ratio) to determine whether the effect on cell viability and growth was linked to the Akt signalling pathway. Akt activation was decreased in the oxysterol-treated cells compared with control cells; however, this did not attain significance. Interestingly, activation of Akt was significantly reduced compared with control cells following incubation with apigenin and astaxanthin both in the absence and in the presence of 7β-OH. Our data suggest that apigenin, lycopene and astaxanthin failed to protect against 7β-OH-induced apoptosis, and the decrease in cell viability and the increase in apoptotic nuclei induced by the antioxidants appear to be associated with down regulation of Akt activity.
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Loke WM, Proudfoot JM, McKinley AJ, Needs PW, Kroon PA, Hodgson JM, Croft KD. Quercetin and its in vivo metabolites inhibit neutrophil-mediated low-density lipoprotein oxidation. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2008; 56:3609-3615. [PMID: 18454540 DOI: 10.1021/jf8003042] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
This study examined the effects of metabolic transformation of the common dietary flavonoid, quercetin, on its ability to protect low-density lipoprotein (LDL) from neutrophil-mediated modification. Quercetin was shown to be effective in protecting LDL against neutrophil-mediated modification at physiological concentrations (1 microM) and appears to act by inhibiting myeloperoxidase (MPO)-catalyzed oxidation (IC(50) = 1.0 microM). Quercetin was also shown to protect against radical-induced [2,2'-azobis(2-methylpropionamidine)dihydrochloride] oxidation (IC(50) = 1.5 microM). Studies of structure-activity relationships showed that methylation at the 3'-position or glucuronidation at the 3-position did not significantly affect inhibition by quercetin of the MPO activity, but conjugations at both positions significantly reduce its activity. Our results suggest that the common dietary flavonoid, quercetin, and some of its major in vivo metabolites are potential inhibitors of MPO at physiological concentrations. Dietary flavonoids that could modify MPO activity could protect lipoproteins from damage in chronic inflammatory states such as cardiovascular disease.
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Affiliation(s)
- Wai Mun Loke
- School of Medicine and Pharmacology, University of Western Australia, Royal Perth Hospital Unit, Medical Research Foundation Building, Level 4, 50 Murray Street, Perth, WA 6000, Australia
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Gambuti A, Strollo D, Erbaggio A, Lecce L, Moio L. Effect of winemaking practices on color indexes and selected bioactive phenolics of Aglianico wine. J Food Sci 2008; 72:S623-8. [PMID: 18034746 DOI: 10.1111/j.1750-3841.2007.00536.x] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Phenolic compounds are responsible for the sensory properties of wine as well as the properties beneficial to human health. The objective of this study was to establish the effect of the use of SO2 and pectolitic enzymes in the prefermentative phase, maceration time, and oak aging on color, anthocyanins, tannins, (+)-catechin, (-)-epicatechin, rutin, trans-resveratrol, and quercetin content of Aglianico wine. Color indexes and phenolics were analyzed by HPLC and spectrophotometric methods. The addition of SO2 and pectolitic enzymes before fermentation caused an increase in color intensity, color stability, total phenolics, anthocyanins, (+)-catechin, (-)-epicatechin rutin, trans-resveratrol, and quercetin content in Aglianico wine. Longer maceration times gave wines richer in total phenolics and with better chromatic characteristics. Storage in oak caused a decrease in anthocyanins, (+)-catechin, (-)-epicatechin, trans-resveratrol, and quercetin content but an increase in total phenolic content, and a stabilizing effect on color also occurred.
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Affiliation(s)
- A Gambuti
- Dipartimento di Scienza degli Alimenti, Univ. degli Studi di Napoli Federico II, Facoltà di Agraria, Via Univ., 100, 80055-Portici, Napoli, Italy.
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Gregoire S, Singh A, Vorsa N, Koo H. Influence of cranberry phenolics on glucan synthesis by glucosyltransferases and Streptococcus mutans acidogenicity. J Appl Microbiol 2007; 103:1960-8. [DOI: 10.1111/j.1365-2672.2007.03441.x] [Citation(s) in RCA: 93] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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34
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Cheng JC, Dai F, Zhou B, Yang L, Liu ZL. Antioxidant activity of hydroxycinnamic acid derivatives in human low density lipoprotein: Mechanism and structure–activity relationship. Food Chem 2007. [DOI: 10.1016/j.foodchem.2006.11.012] [Citation(s) in RCA: 136] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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35
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Féres CAO, Madalosso RC, Rocha OA, Leite JPV, Guimarães TMDP, Toledo VPP, Tagliati CA. Acute and chronic toxicological studies of Dimorphandra mollis in experimental animals. JOURNAL OF ETHNOPHARMACOLOGY 2006; 108:450-6. [PMID: 16872769 DOI: 10.1016/j.jep.2006.06.002] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2005] [Revised: 05/19/2006] [Accepted: 06/07/2006] [Indexed: 05/11/2023]
Abstract
Dimorphandra mollis Benth. (Caesalpiniaceae), known as "faveira" or "fava d'anta" is a common plant in central Brazilian cerrado that is used mainly as a vasoprotector. Its main marker is rutin. The present study aimed to evaluate the security of Dimorphandra mollis dry extract in rodents. The extract presented a rutin content of 76+/-3%. Acute and chronic (180 days) toxicity was evaluated after per os administration. In acute toxicity, 3500 and 5000 mg/kg doses presented reversible effects. In chronic toxicity, 1000 and 2000 mg/kg doses did not provoke significant changes in body weight of the animals and in water and food consumption. Behavioral reversible changes and in blood count parameters (hemoglobin, hematocrit and red cells decrease and platelets increase in male in rats) were observed only in 2000 mg/kg dose. In biochemical evaluation, the results varied a lot considering doses and sex, without a linear profile. Some parameters showed a significant difference but without a clinical correlation. In histopathological examination, lung hemorrhage was observed in 2000 mg/kg dose. In conclusion, the study suggest that the extract is safe in a 1000 mg/kg dose, whereas for 2000 mg/kg dose further studies are needed. In long-term use, caution is required.
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Affiliation(s)
- C A O Féres
- Laboratório de Toxicologia Experimental, Departamento de Análises Clínicas e Toxicológicas, Belo Horizonte, Minas Gerais, Brazil
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36
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Kim MR, Lee JY, Lee HH, Aryal DK, Kim YG, Kim SK, Woo ER, Kang KW. Antioxidative effects of quercetin-glycosides isolated from the flower buds of Tussilago farfara L. Food Chem Toxicol 2006; 44:1299-307. [PMID: 16574296 DOI: 10.1016/j.fct.2006.02.007] [Citation(s) in RCA: 71] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2005] [Revised: 01/05/2006] [Accepted: 02/17/2006] [Indexed: 01/21/2023]
Abstract
A bioassay-guided fractionation of the ethylacetate soluble fraction from the flower buds of Tussilago farfara L. (Compositae) yielded two flavonoids, quercetin 3-O-beta-L-arabinopyranoside and quercetin 3-O-beta-D-glucopyranoside. These two sugar conjugates of quercetin exhibited higher antioxidative activity than their aglycone, quercetin by NBT superoxide scavenging assay. Moreover, treatment with quercetin 3-O-beta-L-arabinopyranoside significantly increased the total glutathione (GSH) contents and the protein level of gamma-glutamylcysteine ligase (gamma-GCL), a key enzyme required for glutathione (GSH) synthesis in a rat hepatocyte cell line. Subcellular fractionation and reporter gene analysis using antioxidant response element (ARE) construct revealed that quercetin 3-O-beta-L-arabinopyranoside increased the level of nuclear Nrf2 and reporter activity, and that these were associated with the induction of the gamma-GCL gene. After 24 h incubation of cells with quercetin 3-O-beta-L-arabinopyranoside, 23% of the glycoside was converted to its aglycone, quercetin, but gamma-GCL was not induced by 7 microM (23%) quercetin. These results suggest that the two quercetin-glycosides isolated from T. farfara L. have direct antioxidative properties, and that quercetin 3-O-beta-L-arabinopyranoside increases the cellular GSH level by inducing the gamma-GCL gene. These novel effects of quercetin-glycosides are suggestive to underlie the potential putative chemopreventive effects of T. farfara L.
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Affiliation(s)
- Mi-Ran Kim
- Research Center for Proteineous Materials, Chosun University, Gwangju 501-759, South Korea
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37
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Cheng JC, Fang JG, Chen WF, Zhou B, Yang L, Liu ZL. Structure–activity relationship studies of resveratrol and its analogues by the reaction kinetics of low density lipoprotein peroxidation. Bioorg Chem 2006; 34:142-57. [PMID: 16712899 DOI: 10.1016/j.bioorg.2006.04.001] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2006] [Revised: 03/28/2006] [Accepted: 04/05/2006] [Indexed: 12/23/2022]
Abstract
Resveratrol (3,5,4'-trans-trihydroxystibene) is a natural phytoalexin present in grapes and red wine, which possesses a variety of biological activities including antioxidative activity. To find more active antioxidants, with resveratrol as the lead compound, we synthesized resveratrol analogues, i.e., 3,4,3',4'-tetrahydroxy-trans-stilbene (3,4,3',4'-THS), 3,4,4'-trihydroxy-trans-stilbene (3,4,4'-THS), 2,4,4'-trihydroxy-trans-stilbene (2,4,4'-THS), 3,3'-dimethoxy-4,4'-dihydroxy-trans-stilbene (3,3'-DM-4,4'-DHS), 3,4-dihydroxy-trans-stilbene (3,4-DHS), 4,4'-dihydroxy-trans-stilbene (4,4'-DHS), 3,5-dihydroxy-trans-stilbene (3,5-DHS) and 2,4-dihydroxy-trans-stilbene (2,4-DHS). Antioxidative effects of resveratrol and its analogues against free-radical-induced peroxidation of human low density lipoprotein (LDL) were studied. The peroxidation was initiated either by a water-soluble initiator 2,2'-azobis(2-amidinopropane hydrochloride) (AAPH), or by cupric ion (Cu(2+)). The reaction kinetics were monitored either by the uptake of oxygen and the depletion of alpha-tocopherol (TOH) presented in the native LDL, or by the formation of thiobarbituric acid reactive substances (TBARS). Kinetic analysis of the antioxidation process demonstrates that these trans-stilbene derivatives are effective antioxidants against both AAPH- and Cu(2+)-induced LDL peroxidation with the activity sequence of 3,4,3',4'-THS approximately 3,3'-DM-4,4'-DHS>3,4-DHS approximately 3,4,4'-THS>2,4,4'-THS>resveratrol approximately 3,5-DHS>4,4'-DHS approximately 2,4-HS, and 3,4,3',4'-THS approximately 3,4-DHS approximately 3,4,4'-THS>3,3'-DM-4,4'-DHS>4,4'-DHS>resveratrol approximately 2,4-HS>2,4,4'-THS approximately 3,5-DHS, respectively. Molecules bearing ortho-dihydroxyl or 4-hydroxy-3-methoxyl groups possess significantly higher antioxidant activity than those bearing no such functionalities.
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Affiliation(s)
- Jin-Chun Cheng
- National Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou, Gansu 730000, China
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38
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Ivanov V, Roomi MW, Kalinovsky T, Niedzwiecki A, Rath M. Bioflavonoids effectively inhibit smooth muscle cell-mediated contraction of collagen matrix induced by angiotensin II. J Cardiovasc Pharmacol 2006; 46:570-6. [PMID: 16220062 DOI: 10.1097/01.fjc.0000179432.73007.45] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Plant-derived bioflavonoids have been recognized to support arterial wall structural integrity and interfere with a variety of proatherosclerotic stimuli. In this study we tested the effects of bioflavonoids on the contractile activity of cultured human aortic smooth muscle cells (SMC) embedded in a 3-dimensional type I collagen matrix. Collagen I solution mixed with human aortic SMC in 24-well plates were allowed to form gels. Tested compounds were added to the wells, and the gels were set afloat by gentle tapping. Digital photographs of the gels were taken after 24 hours of incubation at 37 degrees C. The area of contracted gel was measured and expressed as a percentage of the control gel area from 3 or more replicates. Expression of matrix metalloproteinase (MMP-2) in conditioned media was assessed by gel zymography. Different classes of bioflavanoids showed variable efficiency in inhibiting angiotensin II (ATII)-dependent collagen gel contraction by SMCs. An increase in the number of gallate groups per catechin molecule was associated with increased inhibition of angiotensin II-dependent collagen gel contraction by SMC. Antioxidants (N-acetyl cysteine and ascorbic acid) did not inhibit collagen gel contraction. Bioflavonoid inhibition of collagen gel contraction by SMC correlated with inhibition of matrix metalloproteinase-2 expression. Bioflavonoids participate in the regulation of SMC-mediated contraction and have a strong potential in counteracting pathophysiological effects of ATII. Bioflavonoid activity depends on structural characteristics and can be related to extracellular matrix integrity.
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Affiliation(s)
- V Ivanov
- Matthias Rath Research Insititute, 1260 Memorex Drive, Santa Clara, CA, USA
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39
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Chen WF, Deng SL, Zhou B, Yang L, Liu ZL. Curcumin and its analogues as potent inhibitors of low density lipoprotein oxidation: H-atom abstraction from the phenolic groups and possible involvement of the 4-hydroxy-3-methoxyphenyl groups. Free Radic Biol Med 2006; 40:526-35. [PMID: 16443168 DOI: 10.1016/j.freeradbiomed.2005.09.008] [Citation(s) in RCA: 90] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/10/2005] [Revised: 08/17/2005] [Accepted: 09/05/2005] [Indexed: 11/25/2022]
Abstract
Curcumin (1,7-bis(4-hydroxy-3-methoxyphenyl)-1,6-heptadiene-3,5-dione, 1) is a yellow ingredient isolated from turmeric (Curcumin longa). It has been shown to exhibit a variety of biological activities including antioxidative activity. In order to find more active antioxidants with 1 as the lead compound we synthesized curcumin analogues, i.e., 1,7-bis(3,4-dihydroxyphenyl)-1,6-heptadiene-3,5-dione (2), 1-(3,4-dihydroxyphenyl)-7-(4-hydroxy-3-methoxyphenyl)-1,6-heptadiene-3,5-dione (3), 1-(4-hydroxy-3-methoxyphenyl)-7-(4-hydroxyphenyl)-1,6-heptadiene-3,5-dione (4), 1,7-bis (4-hydroxyphenyl)-1,6-heptadiene-3,5-dione (5), 1-(3,4-dimethoxyphenyl)-7-(4-hydroxy-3-methoxyphenyl)-1,6-heptadiene-3,5-dione (6), 1,7-bis(3,4-dimethoxyphenyl)-1,6- heptadiene-3,5-dione (7), 1,7-bis(4-methoxyphenyl)-1,6-heptadiene-3,5-dione (8), and 1,7-diphenyl-1,6-heptadiene-3,5-dione (9). Antioxidative effects of curcumin and its analogues against free radical initiated peroxidation of human low density lipoprotein (LDL) were studied. The peroxidation was initiated either by a water-soluble initiator 2,2'-azobis(2-amidinopropane hydrochloride) (AAPH), or by cupric ion (Cu2+). The reaction kinetics were monitored either by the uptake of oxygen and the depletion of alpha-tocopherol present in the native LDL, or by the formation of thiobarbituric acid reactive substances. Kinetic analysis of the antioxidation process demonstrates that these compounds, except 7, 8, and 9, are effective antioxidants against AAPH- and Cu2+ -initiated LDL peroxidation by H-atom abstraction from the phenolic groups. Compounds 2 and 3 which bear ortho-diphenoxyl functionality possess significantly higher antioxidant activity than curcumin and other analogues, and the 4-hydroxy-3-methoxyphenyl group also play an important role in the antioxidative activity.
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Affiliation(s)
- Wei-Feng Chen
- National Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, China
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40
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Dai F, Miao Q, Zhou B, Yang L, Liu ZL. Protective effects of flavonols and their glycosides against free radical-induced oxidative hemolysis of red blood cells. Life Sci 2005; 78:2488-93. [PMID: 16307760 DOI: 10.1016/j.lfs.2005.10.009] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2005] [Accepted: 10/04/2005] [Indexed: 02/08/2023]
Abstract
The in vitro oxidative hemolysis of human red blood cells (RBCs) was used as a model to study the free radical-induced damage of biological membranes and the protective effect of flavonols and their glycosides (FOHs), i.e., myricetin (MY), quercetin (Q), morin (MO), kaempferol (K), rutin (R), quercetin galactopyranoside (QG), quercetin rhamnopyranoside (QR), and kaempferol glucopyranoside (KG). The hemolysis of RBCs was induced by a water-soluble free radical initiator 2,2'-azobis(2-methylpropionamidine) dihydrochloride (AAPH). It was found that addition of AAPH at 37 degrees C to the suspension of RBCs caused fast hemolysis after a short period of inhibition period, and addition of FOHs significantly suppressed the hemolysis. The FOHs (MY, Q, R, QG and QR) which bears an ortho-dihydroxyl functionality showed much more effective anti-hemolysis activity than that of the other FOHs (MO, K and KG) bearing no such functionality.
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Affiliation(s)
- Fang Dai
- National Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou, Gansu 730000, China
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41
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Wei QY, Chen WF, Zhou B, Yang L, Liu ZL. Inhibition of lipid peroxidation and protein oxidation in rat liver mitochondria by curcumin and its analogues. Biochim Biophys Acta Gen Subj 2005; 1760:70-7. [PMID: 16236451 DOI: 10.1016/j.bbagen.2005.09.008] [Citation(s) in RCA: 119] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2005] [Revised: 09/09/2005] [Accepted: 09/09/2005] [Indexed: 01/22/2023]
Abstract
Curcumin (1,7-bis(4-hydroxy-3-methoxyphenyl)-1,6-heptadiene-3,5-dione, 1) is a yellow ingredient isolated from turmeric (curcumin longa). It has been shown to exhibit a variety of biological activities including antioxidative activity. In order to find more active antioxidants with 1 as the lead compound we synthesized curcumin analogues, i.e., 1-(3,4-dihydroxyphenyl)-7-(4-hydroxy-3-methoxyphenyl)-1,6-heptadiene-3,5-dione (2), 1-(4-hydroxy-3-methoxyphenyl)-7-(4-hydroxyphenyl)-1,6-heptadiene-3,5-dione (3), 1,7-bis-(4-hydroxyphenyl)-1,6-heptadiene-3,5-dione (4), 1-(3,4-dimethoxyphenyl)-7-(4-hydroxy-3-methoxyphenyl)-1,6-heptadiene-3,5-dione (5), 1,7-bis(3,4-dimethoxyphenyl)-1,6-heptadiene-3,5-dione (6), and 1,7-diphenyl-1,6-heptadiene-3,5-dione (7), and evaluated their antioxidative activity. The in vitro oxidative damage to both lipids and proteins in rat liver mitochondria was used as a model to study the free radical-induced oxidative damage of biological lipids as well as proteins and the protective effects of these curcumin analogues. It was found that these compounds, except 6 and 7, could effectively inhibit the free radical induced lipid peroxidation and protein oxidative damage of rat liver mitochondria by H-atom abstraction from the phenolic groups. Compound 2 which bear ortho-diphenoxyl functionality exhibited remarkably higher antioxidative activity for lipids and proteins than curcumin and other analogues, and the 4-hydroxy-3-methoxyphenyl group also play an important role in the antioxidative activity.
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Affiliation(s)
- Qing-Yi Wei
- National Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou, Gansu 730,000, China
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Yeh SL, Wang WY, Huang CH, Hu ML. Pro-oxidative effect of beta-carotene and the interaction with flavonoids on UVA-induced DNA strand breaks in mouse fibroblast C3H10T1/2 cells. J Nutr Biochem 2005; 16:729-35. [PMID: 16098732 DOI: 10.1016/j.jnutbio.2005.03.012] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2004] [Revised: 03/03/2005] [Accepted: 03/24/2005] [Indexed: 10/25/2022]
Abstract
It has been suggested that beta-carotene itself is unstable under certain conditions and that a combination of antioxidants may prevent the pro-oxidative effects of beta-carotene. Thus, the present study aimed to investigate the interaction of beta-carotene with three flavonoids-naringin, rutin and quercetin-on DNA damage induced by ultraviolet A (UVA) in C3H10T1/2 cells, a mouse embryo fibroblast. The cells were preincubated with beta-carotene and/or flavonoid for 1 h followed by UVA irradiation, and DNA damage was measured using comet assay. We showed that beta-carotene at 20 microM enhanced DNA damage (by 35%; P<.05) induced by UVA (7.6 kJ/m2), whereas naringin, rutin and quercetin significantly decreased UVA-induced DNA damage. When each flavonoid was combined with beta-carotene during preincubation, UVA-induced cellular DNA damage was significantly suppressed and the effects were in the order of naringin > or = rutin > quercetin. The flavonoids decreased UVA-induced oxidation of preincorporated beta-carotene in the same order. Using electron spin resonance spectroscopy, we showed that the ability of these flavonoids to quench singlet oxygen was consistent with protection against DNA damage and beta-carotene oxidation. All three flavonoids had some absorption at the UVA range (320-380 nm), but the effects were opposite to those on DNA damage and beta-carotene oxidation. Taken together, this cell culture study demonstrates an interaction between flavonoids and beta-carotene in UVA-induced DNA damage, and the results suggest that a combination of beta-carotene with naringin, rutin or quercetin may increase the safety of beta-carotene.
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Affiliation(s)
- Shu-Lan Yeh
- Institute of Nutritional Science, Chung Shan Medical University, Taichung, Taiwan 402, ROC
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Zhou B, Miao Q, Yang L, Liu ZL. Antioxidative Effects of Flavonols and Their Glycosides against the Free-Radical-Induced Peroxidation of Linoleic Acid in Solution and in Micelles. Chemistry 2005; 11:680-91. [PMID: 15578643 DOI: 10.1002/chem.200400391] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The antioxidative effect of flavonols and their glycosides against the peroxidation of linoleic acid has been studied in homogeneous solution (tBuOH/H(2)O, 3:2) and in sodium dodecyl sulfate and cetyl trimethylammonium bromide micelles. The peroxidation was initiated thermally by the water-soluble initiator 2,2'-azobis(2-methylpropionamidine) dihydrochloride, and the reaction kinetics were studied by monitoring the formation of linoleic acid hydroperoxides. The synergistic antioxidant effect of the flavonols with alpha-tocopherol (vitamin E) was also studied by following the decay kinetics of alpha-tocopherol and the alpha-tocopheroxyl radical. Kinetic analysis of the antioxidative process demonstrates that the flavonols are effective antioxidants in solution and in micelles, either alone or in combination with alpha-tocopherol. The antioxidative action involves trapping the initiating radicals in solution or in the bulk-water phase of the micelles, trapping the propagating lipid peroxyl radicals on the surface of the micelles, and regenerating alpha-tocopherol by reducing the alpha-tocopheroxyl radical. It was found that the antioxidant activity of the flavonols and their glycosides depends significantly on the position and number of the hydroxy groups, the oxidation potential of the molecule, and the reaction medium. The flavonols bearing ortho-dihydroxy groups possess significantly higher antioxidative activity than those without such functionalities, and the glycosides are less active than their parent aglycones. The activity of the flavonols is higher in micelles than in solution, while the activity of alpha-tocopherol is lower in micelles than in solution. This is because the predominant factor for controlling the activity is the hydrogen-bonding interaction of the antioxidant with the micellar surface in the case of hydrophilic flavonols, while it is the inter- and intramicellar diffusion in the case of lipophilic alpha-tocopherol.
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Affiliation(s)
- Bo Zhou
- National Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou, Gansu 730000, P.R. China
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44
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Ibarretxe G, Sánchez-Gómez MV, Campos-Esparza MR, Alberdi E, Matute C. Differential oxidative stress in oligodendrocytes and neurons after excitotoxic insults and protection by natural polyphenols. Glia 2005; 53:201-11. [PMID: 16206167 DOI: 10.1002/glia.20267] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Oligodendrocytes are vulnerable to overactivation of both their AMPA receptors and their high- and low-affinity kainate receptors. Depending on the intensity of the insult and the type of receptor activated, excitotoxic oligodendrocyte death mediated by these receptors has different characteristics. One important consequence at a cellular level is the ensuing oxidative stress, related to Ca2+-dependent alterations in mitochondrial functioning. We observed that oxidative stress associated with selective AMPA receptor activation is much higher than that associated with the selective activation of high- and low-affinity kainate receptors. Moreover, excitotoxic insults generate more intense oxidative stress in oligodendrocytes than in cortical neurons, though similar alterations in [Ca2+]i and mitochondrial potential were observed in both cell types. Nanomolar concentrations of mangiferin and morin, two natural polyphenols with antioxidant properties, partially protect oligodendrocytes as well as cortical neurons from mild, but not intense, insults mediated by AMPA receptors. In addition to presenting oxygen radical scavenging activity, mangiferin and morin attenuate the intracellular Ca2+ overload subsequent to the activation of AMPA receptors, a mechanism that may contribute to their protective properties. The inclusion of these antioxidant agents in therapeutic strategies for the treatment of diseases in which oligodendrocyte as well as neuron loss occurs may prove to be beneficial.
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Affiliation(s)
- Gaskon Ibarretxe
- Departamento de Neurociencias, Facultad de Medicina y Odontologia, Universidad del País Vasco, Leioa, Spain
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Thuong PT, Na M, Su ND, Seong RS, Lee YM, Sok DE, Bae K. Inhibitory Effect of Coumarins from Weigela subsessilis on Low Density Lipoprotein Oxidation. Biol Pharm Bull 2005; 28:1095-7. [PMID: 15930753 DOI: 10.1248/bpb.28.1095] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Oxidation of low density lipoprotein (LDL) is thought to be a major factor in the pathophysiology of atherosclerosis. In the present study, we found that coumarins isolated from Weigela subsessilis (Caprifoliaceae) inhibited LDL oxidation mediated by either catalytic copper ions (Cu2+) or free radicals generated with the azo compound 2,2'-azobis-(2-amidinopropane)dihydrochloride (AAPH). Of the coumarins tested, scopoletin (1) and cleomiscosin A (2) increased the lag time of conjugated diene formation and inhibited the generation of thiobarbituric acid reactive substances (TBARS) in a dose-dependent manner. In addition, it was found that compounds 1 and 2 had the capacity to protect the fragmentation of apolipoprotein B-100 (apoB-100). These results suggest that W. subsessilis and its active coumarins, 1 and 2, may have a role to play in preventing the LDL oxidation involved in atherogenesis.
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46
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Zhang X, Thuong PT, Jin W, Su ND, Sok DE, Bae K, Kang SS. Antioxidant Activity of Anthraquinones and Flavonoids from Flower ofReynoutria sachalinensis. Arch Pharm Res 2005; 28:22-7. [PMID: 15742803 DOI: 10.1007/bf02975130] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Bioassay-guided fractionation of methanol extract of Reynoutria sachalinensis flower using DPPH assay has led to the isolation of three anthraquinones and three flavonoids. Their structures were identified as emodin (1), emodin-8-O-beta-D-glucopyranoside (2), physcion-8-O-beta-D-glucopyranoside (3), quercetin-3-O-alpha-L-arabinofuranoside (4), quercetin-3-O-beta-D-galactopyranoside (5), and quercetin-3-O-beta-D-glucuronopyranoside (6) by comparing their physicochemical and spectral data with those published in literatures. All isolated compounds were evaluated for antioxidant activities with free radical 1,1-diphenyl-2-picrylhydrazyl (DPPH) scavenging, superoxide radical scavenging and Cu2+-mediated low density lipoprotein (LDL) oxidation assay. The results demonstrated that three flavonoids, 4, 5, and 6 had remarkable antioxidant activities with the IC50 values of 64.3, 54.7, and 46.2 microM (DPPH scavenging), the IC50 values of 6.0, 6.7, and 4.4 microM (superoxide radical scavenging) and the IC50 values of 3.8, 3.2, and 5.4 microM against LDL oxidation, respectively.
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Affiliation(s)
- Xinfeng Zhang
- College of Pharmacy, Chungnam National University, Daejeon 305-764, Korea
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