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Antoniewicz J, Jakubczyk K, Kwiatkowski P, Maciejewska-Markiewicz D, Kochman J, Rębacz-Maron E, Janda-Milczarek K. Analysis of Antioxidant Capacity and Antimicrobial Properties of Selected Polish Grape Vinegars Obtained by Spontaneous Fermentation. Molecules 2021; 26:molecules26164727. [PMID: 34443313 PMCID: PMC8397985 DOI: 10.3390/molecules26164727] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Revised: 07/27/2021] [Accepted: 08/03/2021] [Indexed: 11/16/2022] Open
Abstract
Nowadays, products of natural origin with health-promoting properties are increasingly more common. Research shows that fruit vinegars can be a source of compounds with antioxidant activity. Research on the total antioxidant capacity, total phenolic content, and antimicrobial properties against Staphylococcus aureus, Escherichia coli, and Candida albicans of grape vinegars were conducted. Moreover, gas chromatography was used to measure acetic acid content in the vinegars. The research material consisted of vinegars produced from five different grape varieties. For each variety, two variants were prepared: with and without the addition of sugar in the fermentation process. The highest antimicrobial activity against all micro-organisms was observed in vinegar produced from Solaris grapes with added sugar. The highest polyphenol content was observed in vinegar produced from the Prior grape variety with added sugar and the highest total antioxidant capacity is the Johanniter grape variety with added sugar. The vinegars examined in this study differed, depending on grape variety, in terms of antimicrobial properties, antioxidant capacity, total phenolic content, as well as acetic acid content. Sugar addition caused significant differences in the antioxidant capacity of vinegar samples.
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Affiliation(s)
- Justyna Antoniewicz
- Department of Human Nutrition and Metabolomics, Pomeranian Medical University in Szczecin, 24 Broniewskiego Street, 71-460 Szczecin, Poland; (J.A.); (K.J.); (D.M.-M.); (J.K.)
| | - Karolina Jakubczyk
- Department of Human Nutrition and Metabolomics, Pomeranian Medical University in Szczecin, 24 Broniewskiego Street, 71-460 Szczecin, Poland; (J.A.); (K.J.); (D.M.-M.); (J.K.)
| | - Paweł Kwiatkowski
- Department of Diagnostic Immunology, Chair of Microbiology, Immunology and Laboratory Medicine, Pomeranian Medical University in Szczecin, 72 Powstańców Wlkp. Street, 70-111 Szczecin, Poland;
| | - Dominika Maciejewska-Markiewicz
- Department of Human Nutrition and Metabolomics, Pomeranian Medical University in Szczecin, 24 Broniewskiego Street, 71-460 Szczecin, Poland; (J.A.); (K.J.); (D.M.-M.); (J.K.)
| | - Joanna Kochman
- Department of Human Nutrition and Metabolomics, Pomeranian Medical University in Szczecin, 24 Broniewskiego Street, 71-460 Szczecin, Poland; (J.A.); (K.J.); (D.M.-M.); (J.K.)
| | - Ewa Rębacz-Maron
- Department of Ecology and Anthropology, Institute of Biology, University of Szczecin, 13 Wąska Street, 71-415 Szczecin, Poland;
| | - Katarzyna Janda-Milczarek
- Department of Human Nutrition and Metabolomics, Pomeranian Medical University in Szczecin, 24 Broniewskiego Street, 71-460 Szczecin, Poland; (J.A.); (K.J.); (D.M.-M.); (J.K.)
- Correspondence: ; Tel.: +48-91-441-4818
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Nowicka B, Trela-Makowej A, Latowski D, Strzalka K, Szymańska R. Antioxidant and Signaling Role of Plastid-Derived Isoprenoid Quinones and Chromanols. Int J Mol Sci 2021; 22:2950. [PMID: 33799456 PMCID: PMC7999835 DOI: 10.3390/ijms22062950] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2021] [Revised: 03/11/2021] [Accepted: 03/12/2021] [Indexed: 12/15/2022] Open
Abstract
Plant prenyllipids, especially isoprenoid chromanols and quinols, are very efficient low-molecular-weight lipophilic antioxidants, protecting membranes and storage lipids from reactive oxygen species (ROS). ROS are byproducts of aerobic metabolism that can damage cell components, they are also known to play a role in signaling. Plants are particularly prone to oxidative damage because oxygenic photosynthesis results in O2 formation in their green tissues. In addition, the photosynthetic electron transfer chain is an important source of ROS. Therefore, chloroplasts are the main site of ROS generation in plant cells during the light reactions of photosynthesis, and plastidic antioxidants are crucial to prevent oxidative stress, which occurs when plants are exposed to various types of stress factors, both biotic and abiotic. The increase in antioxidant content during stress acclimation is a common phenomenon. In the present review, we describe the mechanisms of ROS (singlet oxygen, superoxide, hydrogen peroxide and hydroxyl radical) production in chloroplasts in general and during exposure to abiotic stress factors, such as high light, low temperature, drought and salinity. We highlight the dual role of their presence: negative (i.e., lipid peroxidation, pigment and protein oxidation) and positive (i.e., contribution in redox-based physiological processes). Then we provide a summary of current knowledge concerning plastidic prenyllipid antioxidants belonging to isoprenoid chromanols and quinols, as well as their structure, occurrence, biosynthesis and function both in ROS detoxification and signaling.
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Affiliation(s)
- Beatrycze Nowicka
- Department of Plant Physiology and Biochemistry, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Gronostajowa 7, 30-387 Krakow, Poland; (B.N.); (D.L.); (K.S.)
| | - Agnieszka Trela-Makowej
- Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, Reymonta 19, 30-059 Krakow, Poland;
| | - Dariusz Latowski
- Department of Plant Physiology and Biochemistry, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Gronostajowa 7, 30-387 Krakow, Poland; (B.N.); (D.L.); (K.S.)
| | - Kazimierz Strzalka
- Department of Plant Physiology and Biochemistry, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Gronostajowa 7, 30-387 Krakow, Poland; (B.N.); (D.L.); (K.S.)
- Malopolska Centre of Biotechnology, Jagiellonian University, Gronostajowa 7A, 30-387 Krakow, Poland
| | - Renata Szymańska
- Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, Reymonta 19, 30-059 Krakow, Poland;
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Feofanova EV, Chen H, Dai Y, Jia P, Grove ML, Morrison AC, Qi Q, Daviglus M, Cai J, North KE, Laurie CC, Kaplan RC, Boerwinkle E, Yu B. A Genome-wide Association Study Discovers 46 Loci of the Human Metabolome in the Hispanic Community Health Study/Study of Latinos. Am J Hum Genet 2020; 107:849-863. [PMID: 33031748 PMCID: PMC7675000 DOI: 10.1016/j.ajhg.2020.09.003] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Accepted: 09/10/2020] [Indexed: 02/08/2023] Open
Abstract
Variation in levels of the human metabolome reflect changes in homeostasis, providing a window into health and disease. The genetic impact on circulating metabolites in Hispanics, a population with high cardiometabolic disease burden, is largely unknown. We conducted genome-wide association analyses on 640 circulating metabolites in 3,926 Hispanic Community Health Study/Study of Latinos participants. The estimated heritability for 640 metabolites ranged between 0%-54% with a median at 2.5%. We discovered 46 variant-metabolite pairs (p value < 1.2 × 10-10, minor allele frequency ≥ 1%, proportion of variance explained [PEV] mean = 3.4%, PEVrange = 1%-22%) with generalized effects in two population-based studies and confirmed 301 known locus-metabolite associations. Half of the identified variants with generalized effect were located in genes, including five nonsynonymous variants. We identified co-localization with the expression quantitative trait loci at 105 discovered and 151 known loci-metabolites sets. rs5855544, upstream of SLC51A, was associated with higher levels of three steroid sulfates and co-localized with expression levels of SLC51A in several tissues. Mendelian randomization (MR) analysis identified several metabolites associated with coronary heart disease (CHD) and type 2 diabetes. For example, two variants located in or near CYP4F2 (rs2108622 and rs79400241, respectively), involved in vitamin E metabolism, were associated with the levels of octadecanedioate and vitamin E metabolites (gamma-CEHC and gamma-CEHC glucuronide); MR analysis showed that genetically high levels of these metabolites were associated with lower odds of CHD. Our findings document the genetic architecture of circulating metabolites in an underrepresented Hispanic/Latino community, shedding light on disease etiology.
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Affiliation(s)
- Elena V Feofanova
- Human Genetics Center, University of Texas Health Science Center, Houston, TX 77030, USA
| | - Han Chen
- Human Genetics Center, University of Texas Health Science Center, Houston, TX 77030, USA; Center for Precision Health, School of Biomedical Informatics, University of Texas Health Science Center at Houston, Houston, TX 77030, USA
| | - Yulin Dai
- Center for Precision Health, School of Biomedical Informatics, University of Texas Health Science Center at Houston, Houston, TX 77030, USA
| | - Peilin Jia
- Center for Precision Health, School of Biomedical Informatics, University of Texas Health Science Center at Houston, Houston, TX 77030, USA
| | - Megan L Grove
- Human Genetics Center, University of Texas Health Science Center, Houston, TX 77030, USA
| | - Alanna C Morrison
- Human Genetics Center, University of Texas Health Science Center, Houston, TX 77030, USA
| | - Qibin Qi
- Department of Epidemiology and Population Health, Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | - Martha Daviglus
- Institute for Minority Health Research, University of Illinois College of Medicine, Chicago, IL 60612, USA
| | - Jianwen Cai
- Department of Biostatistics, University of North Carolina Gilling School of Global Public Health, Chapel Hill, NC 27599, USA
| | - Kari E North
- Department of Epidemiology, University of North Carolina Gilling School of Global Public Health, Chapel Hill, NC 27599, USA; Carolina Center of Genome Sciences, University of North Carolina, Chapel Hill, NC 27514, USA
| | - Cathy C Laurie
- Department of Biostatistics, University of Washington, Seattle, WA 98195, USA
| | - Robert C Kaplan
- Department of Epidemiology and Population Health, Albert Einstein College of Medicine, Bronx, NY 10461, USA; Public Health Sciences Division, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA
| | - Eric Boerwinkle
- Human Genetics Center, University of Texas Health Science Center, Houston, TX 77030, USA
| | - Bing Yu
- Human Genetics Center, University of Texas Health Science Center, Houston, TX 77030, USA.
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Saeki H, Hara R, Takahashi H, Iijima M, Munakata R, Kenmoku H, Fuku K, Sekihara A, Yasuno Y, Shinada T, Ueda D, Nishi T, Sato T, Asakawa Y, Kurosaki F, Yazaki K, Taura F. An Aromatic Farnesyltransferase Functions in Biosynthesis of the Anti-HIV Meroterpenoid Daurichromenic Acid. Plant Physiol 2018; 178:535-551. [PMID: 30097469 PMCID: PMC6181053 DOI: 10.1104/pp.18.00655] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2018] [Accepted: 07/27/2018] [Indexed: 05/04/2023]
Abstract
Rhododendron dauricum produces daurichromenic acid, an anti-HIV meroterpenoid, via oxidative cyclization of the farnesyl group of grifolic acid. The prenyltransferase (PT) that synthesizes grifolic acid is a farnesyltransferase in plant specialized metabolism. In this study, we demonstrated that the isoprenoid moiety of grifolic acid is derived from the 2-C-methyl-d-erythritol-4-phosphate pathway that takes place in plastids. We explored candidate sequences of plastid-localized PT homologs and identified a cDNA for this PT, RdPT1, which shares moderate sequence similarity with known aromatic PTs. RdPT1 is expressed exclusively in the glandular scales, where daurichromenic acid accumulates. In addition, the gene product was targeted to plastids in plant cells. The recombinant RdPT1 regiospecifically synthesized grifolic acid from orsellinic acid and farnesyl diphosphate, demonstrating that RdPT1 is the farnesyltransferase involved in daurichromenic acid biosynthesis. This enzyme strictly preferred orsellinic acid as a prenyl acceptor, whereas it had a relaxed specificity for prenyl donor structures, also accepting geranyl and geranylgeranyl diphosphates with modest efficiency to synthesize prenyl chain analogs of grifolic acid. Such a broad specificity is a unique catalytic feature of RdPT1 that is not shared among secondary metabolic aromatic PTs in plants. We discuss the unusual substrate preference of RdPT1 using a molecular modeling approach. The biochemical properties as well as the localization of RdPT1 suggest that this enzyme produces meroterpenoids in glandular scales cooperatively with previously identified daurichromenic acid synthase, probably for chemical defense on the surface of R. dauricum plants.
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Affiliation(s)
- Haruna Saeki
- Laboratory of Medicinal Bioresources, Graduate School of Medicine and Pharmaceutical Sciences for Research, University of Toyama, Sugitani, Toyama 930-0194, Japan
| | - Ryota Hara
- Laboratory of Medicinal Bioresources, Graduate School of Medicine and Pharmaceutical Sciences for Research, University of Toyama, Sugitani, Toyama 930-0194, Japan
| | - Hironobu Takahashi
- Institute of Pharmacognosy, Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Yamashiro-cho, Tokushima 770-8514, Japan
| | - Miu Iijima
- Laboratory of Medicinal Bioresources, Graduate School of Medicine and Pharmaceutical Sciences for Research, University of Toyama, Sugitani, Toyama 930-0194, Japan
| | - Ryosuke Munakata
- Laboratory of Plant Gene Expression, Research Institute for Sustainable Humanosphere, Kyoto University, Gokasho, Uji 611-0011, Japan
| | - Hiromichi Kenmoku
- Institute of Pharmacognosy, Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Yamashiro-cho, Tokushima 770-8514, Japan
| | - Kazuma Fuku
- Department of Material Science, Graduate School of Science, Osaka City University Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Ai Sekihara
- Department of Material Science, Graduate School of Science, Osaka City University Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Yoko Yasuno
- Department of Material Science, Graduate School of Science, Osaka City University Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Tetsuro Shinada
- Department of Material Science, Graduate School of Science, Osaka City University Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Daijiro Ueda
- Department of Applied Biological Chemistry, Faculty of Agriculture and Graduate School of Science and Technology, Niigata University, Nishi-ku, Niigata 950-2181, Japan
| | - Tomoyuki Nishi
- Department of Applied Biological Chemistry, Faculty of Agriculture and Graduate School of Science and Technology, Niigata University, Nishi-ku, Niigata 950-2181, Japan
| | - Tsutomu Sato
- Department of Applied Biological Chemistry, Faculty of Agriculture and Graduate School of Science and Technology, Niigata University, Nishi-ku, Niigata 950-2181, Japan
| | - Yoshinori Asakawa
- Institute of Pharmacognosy, Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Yamashiro-cho, Tokushima 770-8514, Japan
| | - Fumiya Kurosaki
- Laboratory of Medicinal Bioresources, Graduate School of Medicine and Pharmaceutical Sciences for Research, University of Toyama, Sugitani, Toyama 930-0194, Japan
| | - Kazufumi Yazaki
- Laboratory of Plant Gene Expression, Research Institute for Sustainable Humanosphere, Kyoto University, Gokasho, Uji 611-0011, Japan
| | - Futoshi Taura
- Laboratory of Medicinal Bioresources, Graduate School of Medicine and Pharmaceutical Sciences for Research, University of Toyama, Sugitani, Toyama 930-0194, Japan
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Pellaud S, Bory A, Chabert V, Romanens J, Chaisse-Leal L, Doan AV, Frey L, Gust A, Fromm KM, Mène-Saffrané L. WRINKLED1 and ACYL-COA:DIACYLGLYCEROL ACYLTRANSFERASE1 regulate tocochromanol metabolism in Arabidopsis. New Phytol 2018; 217:245-260. [PMID: 29105089 DOI: 10.1111/nph.14856] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/2017] [Accepted: 09/19/2017] [Indexed: 05/08/2023]
Abstract
Photosynthetic organisms such as plants, algae and some cyanobacteria synthesize tocochromanols, a group of compounds that encompasses tocopherols and tocotrienols and that exhibits vitamin E activity in animals. While most vitamin E biosynthetic genes have been identified in plant genomes, regulatory genes controlling tocopherol accumulation are currently unknown. We isolated by forward genetics Arabidopsis enhanced vitamin E (eve) mutants that overaccumulate the classic tocopherols and plastochromanol-8, and a tocochromanol unknown in this species. We mapped eve1 and eve4, and identified the unknown Arabidopsis tocochromanol by using a combination of analytical tools. In addition, we determined its biosynthetic pathway with a series of tocochromanol biosynthetic mutants and transgenic lines. eve1 and eve4 are two seed lipid mutants affecting the WRINKLED1 (WRI1) and ACYL-COA:DIACYLGLYCEROL ACYLTRANSFERASE1 (DGAT1) genes, respectively. The unknown tocochromanol is 11'-12' γ-tocomonoenol, whose biosynthesis is VITAMIN E 1 (VTE1) - and VTE2-dependent and is initiated by the condensation of homogentisate (HGA) and tetrahydrogeranylgeranyl pyrophosphate. This study identifies the first two regulatory genes, WRI1 and DGAT1, that control the synthesis of all tocochromanol forms in seeds, and shows the existence of a metabolic trade-off between lipid and tocochromanol metabolisms. Moreover, it shows that Arabidopsis possesses a tocomonoenol biosynthetic pathway that competes with tocopherol synthesis.
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Affiliation(s)
- Sébastien Pellaud
- Department of Biology, University of Fribourg, Chemin du musée 10, CH-1700, Fribourg, Switzerland
| | - Alexandre Bory
- Department of Biology, University of Fribourg, Chemin du musée 10, CH-1700, Fribourg, Switzerland
| | - Valentin Chabert
- Department of Chemistry, University of Fribourg, Chemin du musée, 9, CH-1700, Fribourg, Switzerland
| | - Joëlle Romanens
- Department of Biology, University of Fribourg, Chemin du musée 10, CH-1700, Fribourg, Switzerland
| | - Laurie Chaisse-Leal
- Department of Biology, University of Fribourg, Chemin du musée 10, CH-1700, Fribourg, Switzerland
| | - Anh Vu Doan
- Department of Biology, University of Fribourg, Chemin du musée 10, CH-1700, Fribourg, Switzerland
| | - Lucas Frey
- Department of Biology, University of Fribourg, Chemin du musée 10, CH-1700, Fribourg, Switzerland
| | - Andrea Gust
- Department of Plant Biochemistry, ZMBP - Center for Plant Molecular Biology, University of Tübingen, Auf der Morgenstelle 32, D-72076, Tübingen, Germany
| | - Katharina M Fromm
- Department of Chemistry, University of Fribourg, Chemin du musée, 9, CH-1700, Fribourg, Switzerland
| | - Laurent Mène-Saffrané
- Department of Biology, University of Fribourg, Chemin du musée 10, CH-1700, Fribourg, Switzerland
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Iijima M, Munakata R, Takahashi H, Kenmoku H, Nakagawa R, Kodama T, Asakawa Y, Abe I, Yazaki K, Kurosaki F, Taura F. Identification and Characterization of Daurichromenic Acid Synthase Active in Anti-HIV Biosynthesis. Plant Physiol 2017; 174:2213-2230. [PMID: 28679557 PMCID: PMC5543965 DOI: 10.1104/pp.17.00586] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2017] [Accepted: 06/28/2017] [Indexed: 05/11/2023]
Abstract
Daurichromenic acid (DCA) synthase catalyzes the oxidative cyclization of grifolic acid to produce DCA, an anti-HIV meroterpenoid isolated from Rhododendron dauricum We identified a novel cDNA encoding DCA synthase by transcriptome-based screening from young leaves of R. dauricum The gene coded for a 533-amino acid polypeptide with moderate homologies to flavin adenine dinucleotide oxidases from other plants. The primary structure contained an amino-terminal signal peptide and conserved amino acid residues to form bicovalent linkage to the flavin adenine dinucleotide isoalloxazine ring at histidine-112 and cysteine-175. In addition, the recombinant DCA synthase, purified from the culture supernatant of transgenic Pichia pastoris, exhibited structural and functional properties as a flavoprotein. The reaction mechanism of DCA synthase characterized herein partly shares a similarity with those of cannabinoid synthases from Cannabis sativa, whereas DCA synthase catalyzes a novel cyclization reaction of the farnesyl moiety of a meroterpenoid natural product of plant origin. Moreover, in this study, we present evidence that DCA is biosynthesized and accumulated specifically in the glandular scales, on the surface of R. dauricum plants, based on various analytical studies at the chemical, biochemical, and molecular levels. The extracellular localization of DCA also was confirmed by a confocal microscopic analysis of its autofluorescence. These data highlight the unique feature of DCA: the final step of biosynthesis is completed in apoplastic space, and it is highly accumulated outside the scale cells.
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Affiliation(s)
- Miu Iijima
- Laboratory of Medicinal Bioresources, Graduate School of Medicine and Pharmaceutical Sciences for Research, University of Toyama, Sugitani, Toyama 930-0194, Japan
| | - Ryosuke Munakata
- Laboratory of Plant Gene Expression, Research Institute for Sustainable Humanosphere, Kyoto University, Gokasho, Uji 611-0011, Japan
| | - Hironobu Takahashi
- Institute of Pharmacognosy, Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Yamashiro-cho, Tokushima 770-8514, Japan
| | - Hiromichi Kenmoku
- Institute of Pharmacognosy, Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Yamashiro-cho, Tokushima 770-8514, Japan
| | - Ryuichi Nakagawa
- Laboratory of Medicinal Bioresources, Graduate School of Medicine and Pharmaceutical Sciences for Research, University of Toyama, Sugitani, Toyama 930-0194, Japan
| | - Takeshi Kodama
- Department of Chemical and Biological Engineering, Akita National College of Technology, Iijimabunkyo-cho, Akita 011-8511, Japan
| | - Yoshinori Asakawa
- Institute of Pharmacognosy, Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Yamashiro-cho, Tokushima 770-8514, Japan
| | - Ikuro Abe
- Laboratory of Natural Products Chemistry, Graduate School of Pharmaceutical Sciences, University of Tokyo, Tokyo 113-0033, Japan
| | - Kazufumi Yazaki
- Laboratory of Plant Gene Expression, Research Institute for Sustainable Humanosphere, Kyoto University, Gokasho, Uji 611-0011, Japan
| | - Fumiya Kurosaki
- Laboratory of Medicinal Bioresources, Graduate School of Medicine and Pharmaceutical Sciences for Research, University of Toyama, Sugitani, Toyama 930-0194, Japan
| | - Futoshi Taura
- Laboratory of Medicinal Bioresources, Graduate School of Medicine and Pharmaceutical Sciences for Research, University of Toyama, Sugitani, Toyama 930-0194, Japan
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Fleta-Soriano E, Munné-Bosch S. Enhanced plastochromanol-8 accumulation during reiterated drought in maize (Zea mays L.). Plant Physiol Biochem 2017; 112:283-289. [PMID: 28119116 DOI: 10.1016/j.plaphy.2017.01.016] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2016] [Revised: 01/11/2017] [Accepted: 01/14/2017] [Indexed: 05/13/2023]
Abstract
Plastochromanol-8 (PC-8) belongs to the group of tocochromanols, and together with tocopherols and carotenoids, might help protect photosystem II from photoinhibition during environmental stresses. Here, we aimed to unravel the time course evolution of PC-8 together with that of vitamin E compounds, in maize (Zea mays L.) plants exposed to reiterated drought. Measurements were performed in plants grown in a greenhouse subjected to two consecutive cycles of drought-recovery. PC-8 contents, which accounted for more than 25% of tocochromanols in maize leaves, increased progressively in response to reiterated drought stress. PC-8 contents paralleled with those of vitamin E, particularly α-tocopherol. Profiling of the stress-related phytohormones (ABA, jasmonic acid and salicylic acid) was consistent with a role of ABA in the regulation of PC-8 and vitamin E biosynthesis during drought stress. Results also suggest that PC-8 may help tocopherols prevent damage to the photosynthetic apparatus. A better knowledge of the ABA-dependent regulation of PC-8 may help us manipulate the contents of this important antioxidant in crops.
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Affiliation(s)
- Eva Fleta-Soriano
- Department of Evolutionary Biology, Ecology and Environmental Sciences, Faculty of Biology, University of Barcelona, Barcelona, Spain
| | - Sergi Munné-Bosch
- Department of Evolutionary Biology, Ecology and Environmental Sciences, Faculty of Biology, University of Barcelona, Barcelona, Spain.
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8
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Podszun MC, Jakobi M, Birringer M, Weiss J, Frank J. The long chain α-tocopherol metabolite α-13'-COOH and γ-tocotrienol induce P-glycoprotein expression and activity by activation of the pregnane X receptor in the intestinal cell line LS 180. Mol Nutr Food Res 2016; 61. [PMID: 27714977 DOI: 10.1002/mnfr.201600605] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2016] [Revised: 09/06/2016] [Accepted: 09/30/2016] [Indexed: 12/24/2022]
Abstract
SCOPE Members of the vitamin E family or their metabolites may induce the xenobiotic transporter P-glycoprotein (P-gp), which can limit the bioavailability of drugs and phytochemicals. This study aimed to investigate if α- and γ-tocopherol, α- and γ-tocotrienol, the long chain metabolite α-tocopherol-13'-COOH, the short chain metabolites α- and γ-carboxyethylhydroxychromanol and plastochromanol-8 activate the pregnane X receptor (PXR) and thereby modulate P-gp expression and/or activity. METHODS AND RESULTS P-gp protein expression and activity were studied in LS 180 cells incubated with the respective test compound for 48 h. Furthermore, we determined if the compounds activate PXR in LS 180 cells, as PXR regulates P-gp expression. Neither P-gp protein expression and activity, nor PXR activity were influenced by α-tocopherol, γ-tocopherol and plastochromanol-8. α-Tocotrienol activated PXR in the reporter gene assay but did not induce protein expression or activity of P-gp. γ-Tocotrienol and α-13'-COOH activated PXR and induced protein expression and transporter activity of P-gp. CONCLUSION Because the induction of P-gp in the intestine may limit the systemic bioavailability of its substrates, the concurrent intake of drugs and γ-tocotrienol and, if ever applicable, α-13'-COOH should be avoided.
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Affiliation(s)
- Maren C Podszun
- Institute of Biological Chemistry and Nutrition, University of Hohenheim, Stuttgart, Germany
| | - Metta Jakobi
- Institute of Biological Chemistry and Nutrition, University of Hohenheim, Stuttgart, Germany
| | - Marc Birringer
- Department of Nutritional, Food and Consumer, University of Applied Sciences, Fulda, Germany
| | - Johanna Weiss
- Department of Clinical Pharmacology and Pharmacoepidemiology, University Hospital Heidelberg, Germany
| | - Jan Frank
- Institute of Biological Chemistry and Nutrition, University of Hohenheim, Stuttgart, Germany
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Gabruk M, Habina I, Kruk J, Dłużewska J, Szymańska R. Natural variation in tocochromanols content in Arabidopsis thaliana accessions - the effect of temperature and light intensity. Physiol Plant 2016; 157:147-160. [PMID: 27174597 DOI: 10.1111/ppl.12408] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2015] [Revised: 10/05/2015] [Accepted: 10/08/2015] [Indexed: 06/05/2023]
Abstract
In this study, 25 accessions of Arabidopsis thaliana originating from a variety of climate conditions were grown under controlled circumstances of different light intensity and temperature. The accessions were analyzed for prenyllipids content and composition, as well as expression of the genes involved in tocochromanol biosynthesis (vte1-5). It was found that the applied conditions did not strongly affect total tocochromanols content and there was no apparent correlation of the tocochromanol content with the origin of the accessions. However, the presented results indicate that the temperature, more than the light intensity, affects the expression of the vte1-5 genes and the content of some prenyllipids. An interesting observation was that under low growth temperature, the hydroxy-plastochromanol (PC-OH) to plastochromanol (PC) ratio was considerably increased regardless of the light intensity in most of the accessions. PC-OH is known to be formed as a result of singlet oxygen stress, therefore this observation indicates that the singlet oxygen production is enhanced under low temperature. Unexpectedly, the highest increase in the PC-OH/PC ratio was found for accessions originating from cold climate (Shigu, Krazo-1 and Lov-5), even though such plants could be expected to be more resistant to low temperature stress.
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Affiliation(s)
- Michał Gabruk
- Department of Plant Physiology and Biochemistry, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Krakow, 30-387, Poland
| | - Iwona Habina
- Department of Medical Physics and Biophysics, Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, Krakow, 30-059, Poland
| | - Jerzy Kruk
- Department of Plant Physiology and Biochemistry, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Krakow, 30-387, Poland
| | - Jolanta Dłużewska
- Department of Plant Physiology and Biochemistry, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Krakow, 30-387, Poland
| | - Renata Szymańska
- Department of Medical Physics and Biophysics, Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, Krakow, 30-059, Poland
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10
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Lira BS, Rosado D, Almeida J, de Souza AP, Buckeridge MS, Purgatto E, Guyer L, Hörtensteiner S, Freschi L, Rossi M. Pheophytinase Knockdown Impacts Carbon Metabolism and Nutraceutical Content Under Normal Growth Conditions in Tomato. Plant Cell Physiol 2016; 57:642-653. [PMID: 26880818 DOI: 10.1093/pcp/pcw021] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2015] [Accepted: 01/20/2016] [Indexed: 06/05/2023]
Abstract
Although chlorophyll (Chl) degradation is an essential biochemical pathway for plant physiology, our knowledge regarding this process still has unfilled gaps. Pheophytinase (PPH) was shown to be essential for Chl breakdown in dark-induced senescent leaves. However, the catalyzing enzymes involved in pigment turnover and fruit ripening-associated degreening are still controversial. Chl metabolism is closely linked to the biosynthesis of other isoprenoid-derived compounds, such as carotenoids and tocopherols, which are also components of the photosynthetic machinery. Chls, carotenoids and tocopherols share a common precursor, geranylgeranyl diphosphate, produced by the plastidial methylerythritol 4-phosphate (MEP) pathway. Additionally, the Chl degradation-derived phytol can be incorporated into tocopherol biosynthesis. In this context, tomato turns out to be an interesting model to address isoprenoid-metabolic cross-talk since fruit ripening combines degreening and an intensely active MEP leading to carotenoid accumulation. Here, we investigate the impact of PPH deficiency beyond senescence by the comprehensive phenotyping of SlPPH-knockdown tomato plants. In leaves, photosynthetic parameters indicate altered energy usage of excited Chl. As a mitigatory effect, photosynthesis-associated carotenoids increased while tocopherol content remained constant. Additionally, starch and soluble sugar profiles revealed a distinct pattern of carbon allocation in leaves that suggests enhanced sucrose exportation. The higher levels of carbohydrates in sink organs down-regulated carotenoid biosynthesis. Additionally, the reduction in Chl-derived phytol recycling resulted in decreased tocopherol content in transgenic ripe fruits. Summing up, tocopherol and carotenoid metabolism, together with the antioxidant capacity of the hydrophilic and hydrophobic fractions, were differentially affected in leaves and fruits of the transgenic plants. Thus, in tomato, PPH plays a role beyond senescence-associated Chl degradation that, when compromised, affects isoprenoid and carbon metabolism which ultimately alters the fruit's nutraceutical content.
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Affiliation(s)
- Bruno Silvestre Lira
- Departamento de Botânica, Instituto de Biociências, Universidade de São Paulo, São Paulo, SP, Brazil
| | - Daniele Rosado
- Departamento de Botânica, Instituto de Biociências, Universidade de São Paulo, São Paulo, SP, Brazil
| | - Juliana Almeida
- Departamento de Botânica, Instituto de Biociências, Universidade de São Paulo, São Paulo, SP, Brazil
| | - Amanda Pereira de Souza
- Departamento de Botânica, Instituto de Biociências, Universidade de São Paulo, São Paulo, SP, Brazil
| | | | - Eduardo Purgatto
- Departamento de Alimentos e Nutrição Experimental, Faculdade de Ciências Farmacêuticas, Universidade de São Paulo, São Paulo, SP, Brazil
| | - Luzia Guyer
- Institute of Plant Biology, University of Zurich, Zurich, Switzerland
| | | | - Luciano Freschi
- Departamento de Botânica, Instituto de Biociências, Universidade de São Paulo, São Paulo, SP, Brazil
| | - Magdalena Rossi
- Departamento de Botânica, Instituto de Biociências, Universidade de São Paulo, São Paulo, SP, Brazil
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Kim EH, Lee Y, Kim HU. Fibrillin 5 Is Essential for Plastoquinone-9 Biosynthesis by Binding to Solanesyl Diphosphate Synthases in Arabidopsis. Plant Cell 2015; 27:2956-71. [PMID: 26432861 PMCID: PMC4682332 DOI: 10.1105/tpc.15.00707] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2015] [Accepted: 09/17/2015] [Indexed: 05/05/2023]
Abstract
Fibrillins are lipid-associated proteins in plastids and are ubiquitous in plants. They accumulate in chromoplasts and sequester carotenoids during the development of flowers and fruits. However, little is known about the functions of fibrillins in leaf tissues. Here, we identified fibrillin 5 (FBN5), which is essential for plastoquinone-9 (PQ-9) biosynthesis in Arabidopsis thaliana. Homozygous fbn5-1 mutations were seedling-lethal, and XVE:FBN5-B transgenic plants expressing low levels of FBN5-B had a slower growth rate and were smaller than wild-type plants. In chloroplasts, FBN5-B specifically interacted with solanesyl diphosphate synthases (SPSs) 1 and 2, which biosynthesize the solanesyl moiety of PQ-9. Plants containing defective FBN5-B accumulated less PQ-9 and its cyclized product, plastochromanol-8, but the levels of tocopherols were not affected. The reduced PQ-9 content of XVE:FBN5-B transgenic plants was consistent with their lower photosynthetic performance and higher levels of hydrogen peroxide under cold stress. These results indicate that FBN5-B is required for PQ-9 biosynthesis through its interaction with SPS. Our study adds FBN5 as a structural component involved in the biosynthesis of PQ-9. FBN5 binding to the hydrophobic solanesyl moiety, which is generated by SPS1 and SPS2, in FBN5-B/SPS homodimeric complexes stimulates the enzyme activity of SPS1 and SPS2.
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Affiliation(s)
- Eun-Ha Kim
- Department of Agricultural Biotechnology, National Academy of Agricultural Science, Rural Development Administration, Jeonju 54874, Republic of Korea
| | - Yongjik Lee
- Division of Integrative Biosciences and Biotechnology, Pohang University of Science and Technology, Pohang 37673, Republic of Korea
| | - Hyun Uk Kim
- Department of Agricultural Biotechnology, National Academy of Agricultural Science, Rural Development Administration, Jeonju 54874, Republic of Korea
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Kruk J, Szymańska R, Cela J, Munne-Bosch S. Plastochromanol-8: fifty years of research. Phytochemistry 2014; 108:9-16. [PMID: 25308762 DOI: 10.1016/j.phytochem.2014.09.011] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2014] [Revised: 09/08/2014] [Accepted: 09/16/2014] [Indexed: 05/21/2023]
Abstract
Plastochromanol-8 (PC-8) is an antioxidant that, together with tocopherols and tocotrienols, belongs to the group of tocochromanols. Plastochromanol-8 has been found to occur in several plant species, including mosses, and lichens. PC-8 is found in seeds, leaves and other organs of higher plants. In leaves, PC-8 is restricted to chloroplasts. The identification of tocopherol cyclase (VTE1) as the key enzyme in the biosynthesis of PC-8 suggests that plastoglobules are the primary site of its biosynthesis. Other enzymes related with PC-8 biosynthesis in plastoglobules include: NDC1 and the ABC1-like kinase ABC1K3. The antioxidant properties of PC-8 are similar to those of other chloroplastic antioxidants in polar solvents but considerably they are enhanced in hydrophobic environments, suggesting that the unsaturated side chain performs some quenching activity. As a result of a non-enzymatic reaction, singlet oxygen can oxidize any of the 8 double bonds in the side chain of PC-8, giving at least eight hydroxy-PC-8 isomers. This review summarizes current evidence of a widespread distribution of PC-8 in photosynthetic organisms, as well as the contribution of PC-8 to the pool of lipid-soluble antioxidants in both leaves and seeds.
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Affiliation(s)
- Jerzy Kruk
- Department of Plant Physiology and Biochemistry, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Gronostajowa 7, 30-387 Kraków, Poland
| | - Renata Szymańska
- Department of Medical Physics and Biophysics, Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, Reymonta 19, 30-059 Krakow, Poland
| | - Jana Cela
- Departament de Biologia Vegetal, Facultat de Biologia, Universitat de Barcelona, Avinguda Diagonal 643, E-08028 Barcelona, Spain
| | - Sergi Munne-Bosch
- Departament de Biologia Vegetal, Facultat de Biologia, Universitat de Barcelona, Avinguda Diagonal 643, E-08028 Barcelona, Spain.
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Leba LJ, Brunschwig C, Saout M, Martial K, Vulcain E, Bereau D, Robinson JC. Optimization of a DNA nicking assay to evaluate Oenocarpus bataua and Camellia sinensis antioxidant capacity. Int J Mol Sci 2014; 15:18023-39. [PMID: 25302614 PMCID: PMC4227202 DOI: 10.3390/ijms151018023] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2014] [Revised: 09/18/2014] [Accepted: 09/25/2014] [Indexed: 11/16/2022] Open
Abstract
This study was aimed at assessing the DNA damage protective activity of different types of extracts (aqueous, methanolic and acetonic) using an in vitro DNA nicking assay. Several parameters were optimized using the pUC18 plasmid, especially FeSO4, EDTA, solvent concentrations and incubation time. Special attention has been paid to removing the protective and damaging effect of the solvent and FeSO4 respectively, as well as to identifying the relevant positive and negative controls. For each solvent, the optimal conditions were determined: (i) for aqueous extracts, 0.33 mM of FeSO4 and 0.62 mM of EDTA were incubated for 20 min at 37 °C; (ii) for acetone extracts, 1.16% solvent were incubated for 15 min at 37 °C with 1.3 mM of FeSO4 and 2.5 mM of EDTA and (iii) for methanol extracts, 0.16% solvent, were incubated for 1.5 h at 37 °C with 0.33 mM of FeSO4 and 0.62 mM of EDTA. Using the optimized conditions, the DNA damage protective activity of aqueous, methanolic and acetonic extracts of an Amazonian palm berry (Oenocarpus bataua) and green tea (Camellia sinensis) was assessed. Aqueous and acetonic Oenocarpus bataua extracts were protective against DNA damage, whereas aqueous, methanolic and acetonic extracts of Camellia sinensis extracts induced DNA damage.
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Affiliation(s)
- Louis-Jérôme Leba
- Université des Antilles et de la Guyane, UMR QUALITROP, campus universitaire de Troubiran, P.O. Box 792, 97337 Cayenne Cedex, French Guiana, France.
| | - Christel Brunschwig
- Université des Antilles et de la Guyane, UMR QUALITROP, campus universitaire de Troubiran, P.O. Box 792, 97337 Cayenne Cedex, French Guiana, France.
| | - Mona Saout
- Université des Antilles et de la Guyane, UMR QUALITROP, campus universitaire de Troubiran, P.O. Box 792, 97337 Cayenne Cedex, French Guiana, France.
| | - Karine Martial
- Université des Antilles et de la Guyane, UMR QUALITROP, campus universitaire de Troubiran, P.O. Box 792, 97337 Cayenne Cedex, French Guiana, France.
| | - Emmanuelle Vulcain
- Université des Antilles et de la Guyane, UMR QUALITROP, campus universitaire de Troubiran, P.O. Box 792, 97337 Cayenne Cedex, French Guiana, France.
| | - Didier Bereau
- Université des Antilles et de la Guyane, UMR QUALITROP, campus universitaire de Troubiran, P.O. Box 792, 97337 Cayenne Cedex, French Guiana, France.
| | - Jean-Charles Robinson
- Université des Antilles et de la Guyane, UMR QUALITROP, campus universitaire de Troubiran, P.O. Box 792, 97337 Cayenne Cedex, French Guiana, France.
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Chandrasena LG, Peiris H, Kamani J, Wanigasuriya P, Jayaratne SD, Wijayasiri WAA, Wijesekara GUS. Antioxidants in patients with dengue viral infection. Southeast Asian J Trop Med Public Health 2014; 45:1015-1022. [PMID: 25417502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
An alteration in the oxidation/reduction (redox) status of humans infected with virus infections may contrioute to tefl pariiogeiiesin anu ciniiua1 manifestations of the disease. Alterations in redox markers begin prior to the onset of clinical symptoms, suggesting early changes in the oxidant/antioxidant balance. Early identification of redox markers may be of clinical usefulness in the management of patients with dengue virus infection. We conducted a hospital based comparative cross sectional study of 55 patients serologically confirmed to have dengue infection and 55 clinically healthy age and sex matched subjects as controls to assess oxidative stress in acute dengue virus infection. Blood samples were drawn on the fifth day after symptom onset and analyzed for Trolox equivalent antioxidant capacity (TEAC), reduced glutathione (GSH), glutathione peroxidase (GPx) and paraoxonase (PON) activity. The results showed significantly lower levels of plasma TEAC, serum PON and erythrocyte GSH and GPx activity among dengue patients than in controls. Of the antioxidants investigated, PON appeared to be the most sensitive marker of oxidative stress in dengue virus infection. Serum PON may be a potentially useful marker of oxidative stress in patients with dengue virus infection.
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15
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Taura F, Iijima M, Lee JB, Hashimoto T, Asakawa Y, Kurosaki F. Daurichromenic acid-producing oxidocyclase in the young leaves of Rhododendron dauricum. Nat Prod Commun 2014; 9:1329-1332. [PMID: 25918805] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023] Open
Abstract
Rhododendron dauricum L., a flowering tree popular in Hokkaido, produces daurichromenic acid (DCA), a terpenophenol with a potent anti-HIV activity. The DCA-producing enzyme, named DCA synthase, could be detected in the soluble protein fraction prepared from the young leaves of R. dauricum. DCA synthase catalyzed oxidocyclization of the farnesyl group of grifolic acid to form (+)-DCA as the major reaction product. The DCA synthase reaction proceeds without the need for any cofactors and coenzymes except for molecular oxygen. Interestingly, these catalytic properties of DCA synthase are quite similar to those reported for cannabinoid synthases in the marijuana plant Cannabis sativa L.
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16
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Yang K, Brouwer KLR. Hepatocellular exposure of troglitazone metabolites in rat sandwich-cultured hepatocytes lacking Bcrp and Mrp2: interplay between formation and excretion. Drug Metab Dispos 2014; 42:1219-26. [PMID: 24799397 PMCID: PMC4053994 DOI: 10.1124/dmd.114.057190] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2014] [Accepted: 05/05/2014] [Indexed: 11/22/2022] Open
Abstract
Inhibition of bile acid transport by troglitazone (TGZ) and its major metabolite, TGZ sulfate (TS), may lead to hepatocellular accumulation of toxic bile acids; TS accumulation and hepatotoxicity may be associated with impaired TS biliary excretion. This study evaluated the impact of impaired transport of breast cancer resistance protein (Bcrp) and multidrug resistance-associated protein 2 (Mrp2) on the hepatobiliary disposition of generated metabolites, TS and TGZ glucuronide (TG). Sandwich-cultured hepatocytes (SCH) from Mrp2-deficient (TR(-)) rats in combination with Bcrp knockdown using RNA interference were employed. The biliary excretion index (BEI) of generated TS was not significantly altered by impaired Bcrp (20.9 to 21.1%) and/or Mrp2 function (24.4% and 17.5% in WT and TR(-) rat SCH, respectively). Thus, loss-of-function of Mrp2 and/or Bcrp do not appear to be risk factors for increased hepatocellular TS accumulation in rats, potentially because of a compensatory transporter(s) that excretes TS into bile. Further investigations revealed that the compensatory TS biliary transporter was not the bile salt export pump (Bsep) or P-glycoprotein (P-gp). Interestingly, TGZ sulfation was significantly decreased in TR(-) compared with WT rat SCH (total recovery: 2.8 versus 5.0% of TGZ dose), resulting in decreased hepatocellular TS accumulation, even though sulfotransferase activity in TR(-) rat hepatocyte S9 fraction was similar. Hepatocellular TG accumulation was significantly increased in TR(-) compared with WT rat SCH due to increased glucuronidation and negligible TG biliary excretion. These data emphasize that the interplay between metabolite formation and excretion determines hepatocellular exposure to generated metabolites such as TS and TG.
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Affiliation(s)
- Kyunghee Yang
- Division of Pharmacotherapy and Experimental Therapeutics, UNC Eshelman School of Pharmacy, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Kim L R Brouwer
- Division of Pharmacotherapy and Experimental Therapeutics, UNC Eshelman School of Pharmacy, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
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Gupta S, Bansal R, Ali J, Gabrani R, Dang S. Development and characterization of polyphenon 60 and caffeine microemulsion for enhanced antibacterial activity. Biomed Res Int 2014; 2014:932017. [PMID: 25050379 PMCID: PMC4090578 DOI: 10.1155/2014/932017] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/28/2014] [Revised: 05/27/2014] [Accepted: 06/04/2014] [Indexed: 11/30/2022]
Abstract
Green tea catechins and caffeine have exhibited antibacterial activity; however, their use is limited by lack of stability and effective delivery systems. Polyphenon 60 (P60) and caffeine were encapsulated in a single microemulsion (ME) formulation with an objective to lower the minimum inhibitory concentrations (MICs) of the individual agents against selected pathogens (S. epidermidis and E. coli). Combination of two natural compounds would advocate two different mechanisms on the bacterial growth thereby providing for better antibacterial activity. Thermodynamically stable ME was developed and characterized with an average particle size of 17.58 nm, further confirmed by TEM analysis. Antibacterial studies included chequerboard microdilution assay to determine the MIC and fractional inhibitory concentration (FIC) of both the natural compounds individually and in combination. MIC and FIC results indicated that the combination of the above two natural compounds was proficient in lowering the MICs of individual agents. Results of DPPH assay indicated that ME system preserved the long term antioxidative potential of P60 and caffeine. The cytotoxicity of the optimized formulation on Vero cell line by MTT assay was found to be nontoxic to mammalian cells.
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Affiliation(s)
- Sonal Gupta
- Department of Biotechnology, Jaypee Institute of Information Technology, A-10, Sector 62, Noida, Uttar Pradesh 201307, India
| | - Rakhi Bansal
- Department of Biotechnology, Jaypee Institute of Information Technology, A-10, Sector 62, Noida, Uttar Pradesh 201307, India
| | - Javed Ali
- Faculty of Pharmacy, Jamia Hamdard, Hamdard Nagar, New Delhi 110062, India
| | - Reema Gabrani
- Department of Biotechnology, Jaypee Institute of Information Technology, A-10, Sector 62, Noida, Uttar Pradesh 201307, India
| | - Shweta Dang
- Department of Biotechnology, Jaypee Institute of Information Technology, A-10, Sector 62, Noida, Uttar Pradesh 201307, India
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Chaudhuri D, Baban Ghate N, Deb S, Panja S, Sarkar R, Rout J, Mandal N. Assessment of the phytochemical constituents and antioxidant activity of a bloom forming microalgae Euglena tuba. Biol Res 2014; 47:24. [PMID: 25026869 PMCID: PMC4101720 DOI: 10.1186/0717-6287-47-24] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2014] [Accepted: 05/21/2014] [Indexed: 01/21/2023] Open
Abstract
BACKGROUND Unstable generation of free radicals in the body are responsible for many degenerative diseases. A bloom forming algae Euglena tuba growing abundantly in the aquatic habitats of Cachar district in the state of Assam in North-East India was analysed for its phytochemical contents, antioxidant activity as well as free radical scavenging potentials. RESULTS Based on the ability of the extract in ABTS•+ radical cation inhibition and Fe3+ reducing power, the obtained results revealed the prominent antioxidant activity of the algae, with high correlation coefficient of its TEAC values to the respective phenolic and flavonoid contents. The extract had shown its scavenging activity for different free radicals and 41.89 ± 0.41 μg/ml, 5.83 ± 0.07 μg/ml, 278.46 ± 15.02 μg/ml and 223.25 ± 4.19 μg/ml were determined as the IC50 values for hydroxyl, superoxide, nitric oxide and hypochlorous acid respectively, which are lower than that of the corresponding reference standards. The phytochemical analysis also revealed that the phenolics, flavonoids, alkaloids, tannins and carbohydrates are present in adequate amount in the extract which was confirmed by HPLC analysis. CONCLUSIONS The results showed that 70% methanol extract of the algae possesses excellent antioxidant and free radical scavenging properties.
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Affiliation(s)
- Dipankar Chaudhuri
- />Division of Molecular Medicine, Bose Institute, P-1/12 CIT Scheme VIIM, Kolkata, 700054 India
| | - Nikhil Baban Ghate
- />Division of Molecular Medicine, Bose Institute, P-1/12 CIT Scheme VIIM, Kolkata, 700054 India
| | - Shampa Deb
- />Department of Ecology and Environmental Science, Assam University, Silchar, 788011 Assam India
| | - Sourav Panja
- />Division of Molecular Medicine, Bose Institute, P-1/12 CIT Scheme VIIM, Kolkata, 700054 India
| | - Rhitajit Sarkar
- />Division of Molecular Medicine, Bose Institute, P-1/12 CIT Scheme VIIM, Kolkata, 700054 India
| | - Jayashree Rout
- />Department of Ecology and Environmental Science, Assam University, Silchar, 788011 Assam India
| | - Nripendranath Mandal
- />Division of Molecular Medicine, Bose Institute, P-1/12 CIT Scheme VIIM, Kolkata, 700054 India
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Szymańska R, Nowicka B, Kruk J. Hydroxy-plastochromanol and plastoquinone-C as singlet oxygen products during photo-oxidative stress in Arabidopsis. Plant Cell Environ 2014; 37:1464-1473. [PMID: 24329808 DOI: 10.1111/pce.12253] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2013] [Revised: 11/27/2013] [Accepted: 11/27/2013] [Indexed: 06/03/2023]
Abstract
In the present study, we have shown that hydroxy-plastochromanol and plastoquinone-C, the hydroxy derivatives of plastochromanol and plastoquinone-9, respectively, are specifically formed from the parent compounds upon action of singlet oxygen and can be regarded as stable, specific, natural products of singlet oxygen action during photo-oxidative stress in vivo. The presented data indicate that plastoquinone-C formation dominates mainly during relatively short periods of high light stress where efficient production of singlet oxygen takes place, whereas hydroxy-plastochromanol is rather formed under conditions of long-term, less pronounced generation of singlet oxygen. An interesting observation was that hydroxy-plastochromanol is formed even at very low light conditions (5-10 μmol photons m(-2) s(-1)), indicating that singlet oxygen is generated not only during high light stress but also its formation by photosystem II is inseparably connected with the functioning of this photosystem even at the lowest light intensities.
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Affiliation(s)
- Renata Szymańska
- Department of Plant Physiology and Biochemistry, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Gronostajowa 7, 30-387, Kraków, Poland
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Wallert M, Mosig S, Rennert K, Funke H, Ristow M, Pellegrino RM, Cruciani G, Galli F, Lorkowski S, Birringer M. Long-chain metabolites of α-tocopherol occur in human serum and inhibit macrophage foam cell formation in vitro. Free Radic Biol Med 2014; 68:43-51. [PMID: 24296243 DOI: 10.1016/j.freeradbiomed.2013.11.009] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/06/2013] [Revised: 11/11/2013] [Accepted: 11/13/2013] [Indexed: 02/07/2023]
Abstract
Despite intensive research the physiological role and molecular mechanisms of action of the lipophilic antioxidant α-tocopherol (α-TOH) are still poorly understood. Hepatic α-TOH catabolism results in intermediate formation of the long-chain metabolites (α-LCMs) α-13'-hydroxy- and α-13'-carboxychromanol (α-13'-OH and α-13'-COOH). We propose that α-LCMs have biological functions that need further exploration. Here we report that α-13'-COOH, as detected by LC/MS Q-TOF, occurs in human serum, providing evidence for its systemic bioavailability. Using semisynthetically derived α-LCMs we performed flow cytometric analyses and found that α-LCMs decrease oxidized LDL (oxLDL) uptake (α-13'-OH, 24±6%, α-13'-COOH, 20±5% vs control) and oxLDL-induced lipid accumulation in human macrophages in vitro (α-13'-OH, 26±4%, α-13'-COOH, 21±9% vs oxLDL), probably owing to α-LCM-mediated reduction in phagocytosis of oxLDL (α-13'-OH, 16±6%, α-13'-COOH, 41±3% vs oxLDL). At the same time, α-LCMs induced expression of CD36, the major scavenger receptor for oxLDL, in human macrophages by about 4.5-fold. Blocking experiments provided evidence that α-LCMs influence oxLDL uptake independent of CD36. A key finding of our study is that bioactivity of the α-LCMs occurs at lower concentrations and with mechanisms distinct from those of their metabolic precursor α-TOH. Our findings shed new light on the mechanistic aspects of α-TOH function in macrophages, which seem to be complicated by circulating α-LCMs. We speculate that α-LCMs represent a new class of regulatory metabolites. Further studies are required to elucidate their physiological role and contribution to cardiovascular disease.
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Affiliation(s)
- Maria Wallert
- Department of Nutritional Biochemistry, Institute of Nutrition, Friedrich Schiller University Jena, 07743 Jena, Germany
| | - Sandy Mosig
- Department of Molecular Hemostaseology, University Hospital Jena, Jena, Germany
| | - Knut Rennert
- Department of Molecular Hemostaseology, University Hospital Jena, Jena, Germany
| | - Harald Funke
- Department of Molecular Hemostaseology, University Hospital Jena, Jena, Germany
| | - Michael Ristow
- Department of Human Nutrition, Institute of Nutrition, Friedrich Schiller University Jena, 07743 Jena, Germany
| | - Roberto Maria Pellegrino
- Laboratory of Molecular Modeling and Chemoinformatics, Department of Chemistry, University of Perugia, Perugia, Italy
| | - Gabriele Cruciani
- Laboratory of Molecular Modeling and Chemoinformatics, Department of Chemistry, University of Perugia, Perugia, Italy
| | - Francesco Galli
- Section of Applied Biochemistry and Nutritional Sciences, Department of Internal Medicine, University of Perugia, Perugia, Italy
| | - Stefan Lorkowski
- Department of Nutritional Biochemistry, Institute of Nutrition, Friedrich Schiller University Jena, 07743 Jena, Germany.
| | - Marc Birringer
- Department of Human Nutrition, Institute of Nutrition, Friedrich Schiller University Jena, 07743 Jena, Germany.
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21
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Abstract
NAC (N-acetyl-L-cysteine) is commonly used to identify and test ROS (reactive oxygen species) inducers, and to inhibit ROS. In the present study, we identified inhibition of proteasome inhibitors as a novel activity of NAC. Both NAC and catalase, another known scavenger of ROS, similarly inhibited ROS levels and apoptosis associated with H₂O₂. However, only NAC, and not catalase or another ROS scavenger Trolox, was able to prevent effects linked to proteasome inhibition, such as protein stabilization, apoptosis and accumulation of ubiquitin conjugates. These observations suggest that NAC has a dual activity as an inhibitor of ROS and proteasome inhibitors. Recently, NAC was used as a ROS inhibitor to functionally characterize a novel anticancer compound, piperlongumine, leading to its description as a ROS inducer. In contrast, our own experiments showed that this compound depicts features of proteasome inhibitors including suppression of FOXM1 (Forkhead box protein M1), stabilization of cellular proteins, induction of ROS-independent apoptosis and enhanced accumulation of ubiquitin conjugates. In addition, NAC, but not catalase or Trolox, interfered with the activity of piperlongumine, further supporting that piperlongumine is a proteasome inhibitor. Most importantly, we showed that NAC, but not other ROS scavengers, directly binds to proteasome inhibitors. To our knowledge, NAC is the first known compound that directly interacts with and antagonizes the activity of proteasome inhibitors. Taken together, the findings of the present study suggest that, as a result of the dual nature of NAC, data interpretation might not be straightforward when NAC is utilized as an antioxidant to demonstrate ROS involvement in drug-induced apoptosis.
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Affiliation(s)
- Marianna Halasi
- Department of Medicine, University of Illinois at Chicago, Chicago, IL 60612, U.S.A
| | - Ming Wang
- Department of Medicine, University of Illinois at Chicago, Chicago, IL 60612, U.S.A
| | - Tanmay S. Chavan
- Department of Biochemistry and Molecular Genetics, University of Illinois at Chicago, Chicago, IL 60607, U.S.A
| | - Vadim Gaponenko
- Department of Biochemistry and Molecular Genetics, University of Illinois at Chicago, Chicago, IL 60607, U.S.A
| | - Nissim Hay
- Department of Biochemistry and Molecular Genetics, University of Illinois at Chicago, Chicago, IL 60607, U.S.A
- Research and Development Section, Jesse Brown VA Medical Center, Chicago, IL 60612, U.S.A
| | - Andrei L. Gartel
- Department of Medicine, University of Illinois at Chicago, Chicago, IL 60612, U.S.A
- Department of Biochemistry and Molecular Genetics, University of Illinois at Chicago, Chicago, IL 60607, U.S.A
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Abstract
In bacteria and mitochondria, ABC1 (for Activity of bc1 complex)-like kinases regulate ubiquinone synthesis, mutations causing severe respiration defects, including neurological disorders in humans. Little is known about plant ABC1-like kinases; in Arabidopsis (Arabidopsis thaliana), five are predicted in mitochondria but, surprisingly, six are located at lipid droplets in chloroplasts. These are a known site of prenylquinone (including tocopherol [vitamin E], phylloquinone [vitamin K] and plastoquinone) metabolism and contain a large proportion of the tocopherol cyclase (VTE1) required for vitamin E synthesis and recycling. Therefore, ABC1-like kinases may be involved in the regulation of chloroplast prenylquinone metabolism. Using a nontargeted lipidomics approach, we demonstrate that plants lacking the plastoglobule ABC1-like kinase ABC1K3 are defective both for the production of plastochromanol-8 (a plastoquinone-derived lipid antioxidant) and the redox recycling of α-tocopherol, whereas tocopherol production is not affected. All of these pathways require VTE1 activity. However, in the abc1k3 mutant, VTE1 levels are strongly reduced posttranscriptionally. We provide evidence that the ABC1-like kinase ABC1K3 phosphorylates VTE1, possibly stabilizing it at plastoglobules. However, ABC1K3 may also have other targets and be involved in a wider chloroplast regulatory network.
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Zhao L, Bajrami B, Rusling JF. Rapid LC-MS drug metabolite profiling using bioreactor particles. Methods Mol Biol 2013; 987:129-34. [PMID: 23475673 DOI: 10.1007/978-1-62703-321-3_11] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Enzyme-coated magnetic bioreactor particles enable a fast, convenient approach to metabolic screening. A semi-automated metabolite-profiling technique using these particles in a 96-well plate with liquid chromatography (LC)-mass spectrometry (MS)/MS detection is described. Reactions can be investigated over 1- to 2-min periods, and 96 or more reactions or reaction time points can be processed in parallel. Incorporation of DNA in the particle films facilitates determination of rates of DNA damage and metabolite-DNA adduct structures.
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Affiliation(s)
- Linlin Zhao
- Department of Chemistry, University of Connecticut, Storrs, CT, USA
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Ercisli S, Tosun M, Karlidag H, Dzubur A, Hadziabulic S, Aliman Y. Color and antioxidant characteristics of some fresh fig (Ficus carica L.) genotypes from northeastern Turkey. Plant Foods Hum Nutr 2012; 67:271-276. [PMID: 22618081 DOI: 10.1007/s11130-012-0292-2] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Fruit skin color, total phenolics, total anthocyanins, soluble solids content, titratable acidity and total antioxidant capacity in fresh fruits of a number of local and well-known fig (Ficus carica L.) genotypes and cultivars grown in northeastern Turkey were determined. TEAC (Trolox equivalent antioxidant capacity) and FRAP (ferric reducing antioxidant power) assays were used to determine total antioxidant capacity. Fruit skin color of genotypes were found to be very diverse, i.e., light green, light purple, purple, dark purple and black. The content of total phenolics, soluble solids content (SSC) and titratable acidity greatly varied in the range from 24 to 237 mg of gallic acid equivalent per 100 g fresh weight, 18.60 to 26.30 % and 0.16 to 0.47 % in local genotypes and studied cultivars. In general, total antioxidant capacities determined by two methods expressed higher values in the local fig genotypes compared with the cultivars. The results suggested that genotype is the main factor that determines difference in the composition of bioactive compounds in figs and provide information on putative health benefits locally grown genotypes.
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Affiliation(s)
- Sezai Ercisli
- Department of Horticulture, Ataturk University, Erzurum, Turkey.
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25
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Wang W, Wang H, Li A. [Biosynthesis of benzoisochromanequinones antibiotics from streptomycetes--a review]. Wei Sheng Wu Xue Bao 2012; 52:541-549. [PMID: 22803338] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Benzoisochromanequinones antibiotics, a group of bioactive polyketide compounds with aromatic polyketide skeletal cores, are accumulated in streptomycetes. The biosynthesis of benzoisochromanequinones antibiotics has triggered great interest because they not only represent model biosynthetic mechanisms of aromatic polyketide skeletal structures, but also possess a variety of tailoring modifications rendering them highly structural and bioactive diversity. Here we reviewed important advances in biosynthesis of benzoisochromanequinones antibiotics in recent 25 years with focusing on the modification mechanisms of these compounds and on the prospects of the metabolic engineering and pharmaceutical discovery of benzoisochromanequinones antibiotics.
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Affiliation(s)
- Wei Wang
- College of Life Sciences, Central China Normal University, Wuhan 430079, China.
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Abstract
Background Cigarette smoke (CS) is a highly complex mixture and many of its components are known carcinogens, mutagens, and other toxic substances. CS induces oxidative stress and cell death, and this cell toxicity plays a key role in the pathogenesis of several pulmonary diseases. Methodology/Principal Findings We studied the effect of cigarette smoke extract (CSE) in human alveolar epithelial type I-like (ATI-like) cells. These are isolated type II cells that are differentiating toward the type I cell phenotype in vitro and have lost many type II cell markers and express type I cell markers. ATI-like cells were more sensitive to CSE than alveolar type II cells, which maintained their differentiated phenotype in vitro. We observed disruption of mitochondrial membrane potential, apoptosis and necrosis that were detected by double staining with acridine orange and ethidium bromide or Hoechst 33342 and propidium iodide and TUNEL assay after treatment with CSE. We also detected caspase 3 and caspase 7 activities and lipid peroxidation. CSE induced nuclear translocation of Nrf2 and increased expression of Nrf2, HO-1, Hsp70 and Fra1. Moreover, we found that Nrf2 knockdown sensitized ATI-like cells to CSE and Nrf2 overexpression provided protection against CSE-induced cell death. We also observed that two antioxidant compounds N-acetylcysteine and trolox protected ATI-like cells against injury by CSE. Conclusions Our study indicates that Nrf2 activation is a major factor in cellular defense of the human alveolar epithelium against CSE-induced toxicity and oxidative stress. Therefore, antioxidant agents that modulate Nrf2 would be expected to restore antioxidant and detoxifying enzymes and to prevent CS-related lung injury and perhaps lessen the development of emphysema.
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Affiliation(s)
- Beata Kosmider
- Department of Medicine, National Jewish Health, Denver, Colorado, United States of America.
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Tramice A, Andreotti G, Trincone A. Hydrosoluble antioxidants by enzymatic glucosylation of a vitamin E derivative using marine α-D-glucosidase from Aplysia fasciata. Mar Biotechnol (NY) 2011; 13:773-781. [PMID: 21210171 DOI: 10.1007/s10126-010-9339-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2009] [Accepted: 10/29/2010] [Indexed: 05/30/2023]
Abstract
Relevant examples of polyglycosylating exo-glycosidases were reported among enzymes of marine origin (Aplysia fasciata, Geobacillus, and Pecten maximus). Herein we describe the enzymatic polyglucosylation of a chromane-methanol (2-hydroxymethyl-2,5,7,8-tetramethylchroman-6-ol) performed by using the α-D-glucosidase from the sea hare Aplysia fasciata. New di-, tri-, and tetrasaccharide derivatives were synthesized and their antioxidant activities were evaluated by DPPH test. High enzymatic substrate conversion was assessed by NMR spectroscopy, and the products were easily purified. These findings suggest that the proposed procedure is an effective process both for the molecular diversity of products and for the peculiar stereochemistry of the enzyme. At the beginning of the enzymatic reaction, only (S)-diastereomer of the monoglucoside was obtained. The isomaltoside was the most abundant disaccharide obtained and showed a radical scavenging activity similar to that of the chromane-methanol. The disaccharide can be considered a new hydrosoluble antioxidant agent useful for various technological applications (cosmetics, food industry, etc.). A relationship between the interglycosidic linkage present in disaccharides and trisaccharides and their scavenging activity was also pointed out.
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Affiliation(s)
- Annabella Tramice
- Istituto di Chimica Biomolecolare, Consiglio Nazionale delle Ricerche, Via Campi Flegrei 34, 80072 Pozzuoli, Naples, Italy
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Mukherjee S, Pawar N, Kulkarni O, Nagarkar B, Thopte S, Bhujbal A, Pawar P. Evaluation of free-radical quenching properties of standard Ayurvedic formulation Vayasthapana Rasayana. BMC Complement Altern Med 2011; 11:38. [PMID: 21569386 PMCID: PMC3123254 DOI: 10.1186/1472-6882-11-38] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/09/2010] [Accepted: 05/12/2011] [Indexed: 11/13/2022]
Abstract
BACKGROUND Cellular damage induced by free-radicals like Reactive Oxygen and Nitrogen Species (ROS and RNS) has been implicated in several disorders and diseases, including ageing. Hence naturally occurring anti-oxidant rich-herbs play a vital role in combating these conditions. The present study was carried out to investigate the in vitro free-radical quenching capacity of a known Ayurvedic poly-herbal formulation called Vayasthapana Rasayana. METHODS Methanol extracts of Vayasthapana Rasayana formulation (VRF) were studied for in vitro total antioxidant activity along with phenolic content and reducing power. In vitro assays like DPPH, FRAP, ABTS scavenging to evaluate radical quenching potential were performed. RESULTS The formulation has shown 94% at 0.1 mg/ml DPPH free-radical scavenging activity as against 84% at 0.1 mg/ml for standard ascorbic acid (IC₅₀ value 5.51 μg/ml for VRF and 39 μg/ml for standard). It has a significant higher ferric reducing potential also (OD 0.87 at 700 nm & 0.21 at 0.1 mg/ml for VRF and standard, respectively). The total phenolic content (gallic acid equivalent) of the VRF is 8.3 mg per g of dry mass. Total antioxidant capacity of the formulation, estimated by FRAP was 1150 ± 5 μM Fe(II)/g dry mass. ABTS radical scavenging activity of VRF was 69.55 ± 0.21% at 100 μg/ml concentration with a IC50 value of 69.87 μg/ml as against 9% and 95% by ascorbic acid and Trolox (at 70.452 μg/ml and 0.250 μg/ml concentrations, respectively). CONCLUSION In Indian traditional Ayurvedic system, use of VRF is in regular practice for mainly combating age-related disorders and diseases as many of the components of the Rasayana are known for their free-radical scavenging activity. This study has validated the potential use of VRF as an anti-oxidant to fight age-related problems.
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Affiliation(s)
| | | | | | - Bhagyashri Nagarkar
- Rajiv Gandhi Institute for IT and Biotechnology, Bharati Vidyapeeth University, Pune-Satara Road, Pune - 411 046, Maharashtra, India
| | - Shrikant Thopte
- Rajiv Gandhi Institute for IT and Biotechnology, Bharati Vidyapeeth University, Pune-Satara Road, Pune - 411 046, Maharashtra, India
| | - Akshay Bhujbal
- Modern College for Arts, Science and Commerce, Shivajinagar, Pune - 411 005, Maharashtra, India
| | - Pankaj Pawar
- Interactive Research School for Health Affairs, Bharati Vidyapeeth University, Pune-Satara Road, Pune - 411 043, Maharashtra, India
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Granato D, Branco GF, Faria JDAF, Cruz AG. Characterization of Brazilian lager and brown ale beers based on color, phenolic compounds, and antioxidant activity using chemometrics. J Sci Food Agric 2011; 91:563-71. [PMID: 21218493 DOI: 10.1002/jsfa.4222] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2010] [Revised: 10/02/2010] [Accepted: 10/14/2010] [Indexed: 05/13/2023]
Abstract
BACKGROUND Epidemiological studies have shown that beer has positive effects on inhibiting atherosclerosis, decreasing the content of serum low-density lipoprotein cholesterol and triglycerides, by acting as in vivo free radical scavenger. In this research, the antioxidant activity of commercial Brazilian beers (n = 29) was determined by the oxygen radical absorbance capacity (ORAC) and 1,1-diphenyl-2-picrylhydrazyl (DPPH(·) ) assays and results were analyzed by chemometrics. RESULTS The brown ale samples (n = 11) presented higher (P < 0.05) flavonoids (124.01 mg L(-1) ), total phenolics (362.22 mg L(-1) ), non-flavonoid phenolics (238.21 mg L(-1) ), lightness (69.48), redness (35.75), yellowness (55.71), color intensity (66.86), hue angle (59.14), color saturation (0.9620), DPPH(·) values (30.96% inhibition), and ORAC values (3, 659.36 µmol Trolox equivalents L(-1) ), compared to lager samples (n = 18). Brown ale beers presented higher antioxidant properties (P < 0.05) measured by ORAC (1.93 times higher) and DPPH (1.65 times higher) compared to lager beer. ORAC values correlated well with the content of flavonoids (r = 0.47; P = 0.01), total phenolic compounds (r = 0.44; P < 0.01) and DPPH (r = 0.67; P < 0.01). DPPH values also correlated well to the content of flavonoids (r = 0.69; P < 0.01), total phenolic compounds (r = 0.60; P < 0.01), and non-flavonoid compounds (r = 0.46; P = 0.01). CONCLUSION The results suggest that brown ale beers, and less significantly lager beers, could be sources of bioactive compounds with suitable free radical scavenging properties.
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Affiliation(s)
- Daniel Granato
- Department of Food and Experimental Nutrition, Faculty of Pharmaceutical Sciences, University of São Paulo, Av. Prof. Lineu Prestes, 580, B14, 05508-000, São Paulo, São Paulo, Brazil.
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Affiliation(s)
- Nicholas Smirnoff
- College of Life and Environmental Sciences, University of Exeter, Exeter EX4 4QD, United Kingdom.
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Abstract
BACKGROUND The uptake and biotransformation of gamma-tocopherol (gamma-T) in humans is largely unknown. Using a stable isotope method we investigated these aspects of gamma-T biology in healthy volunteers and their response to gamma-T supplementation. METHODS A single bolus of 100 mg of deuterium labeled gamma-T acetate (d(2)-gamma-TAC, 94% isotopic purity) was administered with a standard meal to 21 healthy subjects. Blood and urine (first morning void) were collected at baseline and a range of time points between 6 and 240 h post-supplemetation. The concentrations of d(2) and d(0)-gamma-T in plasma and its major metabolite 2,7,8-trimethyl-2-(b-carboxyethyl)-6-hydroxychroman (-gamma-CEHC) in plasma and urine were measured by GC-MS. In two subjects, the total urine volume was collected for 72 h post-supplementation. The effects of gamma-T supplementation on alpha-T concentrations in plasma and alpha-T and gamma-T metabolite formation were also assessed by HPLC or GC-MS analysis. RESULTS At baseline, mean plasma alpha-T concentration was approximately 15 times higher than gamma-T (28.3 vs. 1.9 micromol/l). In contrast, plasma gamma-CEHC concentration (0.191 micromol/l) was 12 fold greater than alpha-CEHC (0.016 micromol/l) while in urine it was 3.5 fold lower (0.82 and 2.87 micromol, respectively) suggesting that the clearance of alpha-CEHC from plasma was more than 40 times that of gamma-CEHC. After d(2)-gamma-TAC administration, the d(2) forms of gamma-T and gamma-CEHC in plasma and urine increased, but with marked inter-individual variability, while the d(0) species were hardly affected. Mean total concentrations of gamma-T and gamma-CEHC in plasma and urine peaked, respectively, between 0-9, 6-12 and 9-24 h post-supplementation with increases over baseline levels of 6-14 fold. All these parameters returned to baseline by 72 h. Following challenge, the total urinary excretion of d(2)-gamma-T equivalents was approximately 7 mg. Baseline levels of gamma-T correlated positively with the post-supplementation rise of (d(0) + d(2)) - gamma - T and gamma-CEHC levels in plasma, but correlated negatively with urinary levels of (d(0) + d(2))-gamma-CEHC. Supplementation with 100 mg gamma-TAC had minimal influence on plasma concentrations of alpha-T and alpha-T-related metabolite formation and excretion. CONCLUSIONS Ingestion of 100mg of gamma-TAC transiently increases plasma concentrations of gamma-T as it undergoes sustained catabolism to CEHC without markedly influencing the pre-existing plasma pool of gamma-T nor the concentration and metabolism of alpha-T. These pathways appear tightly regulated, most probably to keep high steady-state blood ratios alpha-T to gamma-T and gamma-CEHC to alpha-CEHC.
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Affiliation(s)
- Francesco Galli
- Lung Biology, School of Health and Life Sciences, King's College, London, UK.
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Abstract
An analytical study was carried out on the presence of antioxidant constituents and the in vitro antioxidant capacity in the extracts of three species of Spanish red-skinned cactus pear fruits (Opuntia ficus-indica, Opuntia undulata and Opuntia stricta). The cactus pear fruit extracts were analyzed for determined constituents: ascorbic acid, flavonoids (quercetin, isorhamnetin, myricetin, kaempferol and luteolin), betalains, taurine, total carotenoids and total phenolics. The antioxidant capacity was assessed by means of two different methods: the 2,2'-azinobis(3-ethylbenzothiazoline-6-sulfonic acid) (Trolox equivalent antioxidant capacity) method and the 2,2-diphenyl-1-picrylhydrazyl radical method. Opuntia ficus-indica fruit extract had the strongest antioxidant capacity and taurine content. O. stricta fruits were the richest in ascorbic acid and total phenolics, whereas O. undulata fruits showed the highest carotenoid content. Quercetin and isorhamnetin were the main flavonoids detected. This study provides basic information on the presence of bioactive compounds and antioxidant capacity in extracts of cactus pear fruits, in order to consider these extracts as ingredient for the production of health-promoting food.
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Affiliation(s)
- José A Fernández-López
- Departamento de Ingeniería Química y Ambiental, Universidad Politécnica de Cartagena (UPCT), Paseo Alfonso XIII 52, E-30203, Cartagena, Murcia, Spain.
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Gallardo-Chacón JJ, Vichi S, Urpí P, López-Tamames E, Buxaderas S. Antioxidant activity of lees cell surface during sparkling wine sur lie aging. Int J Food Microbiol 2010; 143:48-53. [PMID: 20709418 DOI: 10.1016/j.ijfoodmicro.2010.07.027] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2010] [Revised: 07/09/2010] [Accepted: 07/17/2010] [Indexed: 11/18/2022]
Abstract
Given the importance of the interactions between wine and lees cell surface during sparkling wine aging, and in view of recent results proving the antioxidant potential of yeast cell wall biomolecules, the antioxidant capacity of lees cell surface was investigated to establish its possible role in the antioxidative effect of lees. The surface antioxidant activity of lees from wines with different aging periods was determined on the whole cell by two widely used methods (DPPH and FRAP assays), obtaining maximum values of 24.5micromol Trolox/g cells (fresh weight) by the DPPH assay, and 21.3micromol Trolox/g cells (fresh weight) by the FRAP assay. Lees surface antioxidant activity was influenced by base wine characteristics and inversely related to sur lie aging period. Conversely, the percentage depletion of lees surface antioxidant activity during aging was mainly determined by the length of aging, regardless of wine characteristics. To examine the influence of cell wall thiol groups and adsorbed polyphenols on lees' protective effect, their presence on cell surfaces was assessed. They accounted for 25+/-11% and 54+/-7% of the antioxidant activity measured by DPPH, respectively, and 0.3+/-0.1% and 39+/-8% measured by FRAP, respectively. Only a part of the remnant antioxidant activity of lees surface measured by FRAP could be theoretically explained by the presence of cell wall mannans.
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Affiliation(s)
- Joan J Gallardo-Chacón
- Departament de Nutrició i Bromatologia, Xarxa de Referència en Tecnologia dels Aliments, Facultat de Farmàcia, Universitat de Barcelona, Avda Joan XXIII, s/n, E-08028, Barcelona, Spain
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Wang Y, Fang F, Wong CW. Troglitazone is an estrogen-related receptor alpha and gamma inverse agonist. Biochem Pharmacol 2010; 80:80-5. [PMID: 20298676 DOI: 10.1016/j.bcp.2010.03.013] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2010] [Revised: 03/07/2010] [Accepted: 03/09/2010] [Indexed: 01/16/2023]
Abstract
As a ligand for peroxisome proliferators-activated receptor gamma (PPAR gamma), troglitazone inhibits cell growth by mechanisms besides activating PPAR gamma. In this study, we found that troglitazone interfered with the interactions between estrogen-related receptor alpha and gamma (ERR alpha and ERR gamma) and their coactivator PPAR gamma coactivator-1 alpha (PGC-1 alpha) functioning as an inverse agonist. Additionally, troglitazone suppressed the expressions of PGC-1 alpha and its related member PGC-1 beta which are key regulators of mitochondrial function. Consequently, troglitazone reduced mitochondrial mass and suppressed the expressions of superoxide dismutases to elevate reactive oxygen species (ROS) production. The increase in ROS in turn induced the expression of cell cycle inhibitor p21(WAF1). We therefore propose that ERR alpha and ERR gamma are alternative targets of troglitazone important for mediating its growth suppressive effect.
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Affiliation(s)
- Yanfei Wang
- Guangzhou Institute of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou Science City, Guangzhou 510663, China
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Meechan AJ, Henderson C, Bates CD, Grant MH, Tettey JNA. Metabolism of troglitazone in hepatocytes isolated from experimentally induced diabetic rats. J Pharm Pharmacol 2010; 58:1359-65. [PMID: 17034659 DOI: 10.1211/jpp.58.10.0009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
Abstract
Troglitazone (TGZ), the prototype 2,4-thiazolidinedione antidiabetic agent, is associated with hepa-totoxicity in patients with Type 2 diabetes. Although the mechanism of toxicity has not been established, alterations in the clearance of TGZ from in-vitro hepatocyte cultures through metabolic conjugation reactions are believed to modulate the toxicity of the compound. In this study, the metabolism of TGZ in freshly isolated hepatocytes from the fat-fed streptozotocin-treated rat model of Type 2 diabetes is described. Biochemical parameters such as cellular reduced glutathione content, content of cytochromes P450 and b5, and the expression of glutathione-S-transferase α (subunits Ya and Yc2) were not affected by the induced diabetes. TGZ was metabolized primarily to a sulfonate, a quinone and a glucuronide in both control and experimentally diabetic animals. However, metabolism after induction of diabetes was characterized by a moderate increase in sulfation, a decrease in the elimination half-life of TGZ and the absence of the minor metabolites of TGZ, notably the glutathione adduct of the putative reactive intermediate (m/z = 747 (M + H)+; m/z = 745 (M — H)−).
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Affiliation(s)
- A J Meechan
- Department of Pharmaceutical Sciences, University of Strathclyde, 27 Taylor Street, Glasgow G4 0NR, Scotland, UK
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36
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Mustacich DJ, Leonard SW, Patel NK, Traber MG. Alpha-tocopherol beta-oxidation localized to rat liver mitochondria. Free Radic Biol Med 2010; 48:73-81. [PMID: 19819327 PMCID: PMC2818260 DOI: 10.1016/j.freeradbiomed.2009.10.024] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/23/2009] [Revised: 09/21/2009] [Accepted: 10/04/2009] [Indexed: 12/14/2022]
Abstract
Approximately 40% of Americans take dietary supplements, including vitamin E (alpha-tocopherol). Unlike other fat-soluble vitamins, alpha-tocopherol is not accumulated to toxic levels. Rather tissue levels are tightly regulated, in part via increased hepatic metabolism and excretion that could, theoretically, alter metabolism of drugs, environmental toxins, and other nutrients. To date, in vivo subcellular location(s) of alpha-tocopherol metabolism have not been identified. The proposed pathway of alpha-tocopherol metabolism proceeds via omega-hydroxylation to 13'-OH-alpha-tocopherol, followed by successive rounds of beta-oxidation to form alpha-CEHC. To test the hypothesis that alpha-tocopherol omega-hydroxylation occurs in microsomes while beta-oxidation occurs in peroxisomes, rats received daily injections of vehicle, 10 mg alpha-tocopherol, or 10 mg trolox/100 g body wt for 3 days, and then microsomes, mitochondria, and peroxisomes were isolated from liver homogenates. Homogenate alpha-tocopherol levels increased 16-fold in alpha-tocopherol-injected rats, while remaining unchanged in trolox- or vehicle-injected rats. Total alpha-tocopherol recovered in the three subcellular fractions represented 93+/-4% of homogenate alpha-tocopherol levels. In alpha-tocopherol-injected rats, microsome alpha-tocopherol levels increased 28-fold, while mitochondria and peroxisome levels increased 8- and 3-fold, respectively, indicating greater partitioning of alpha-tocopherol to the microsomes with increasing liver alpha-tocopherol. In alpha-tocopherol-injected rats, microsome 13'-OH-alpha-tocopherol levels increased 24-fold compared to controls, and were 7-fold greater than 13'-OH-alpha-tocopherol levels in peroxisome and mitochondrial fractions of alpha-tocopherol-injected rats. An unexpected finding was that alpha-CEHC, the end product of alpha-tocopherol metabolism, was found almost exclusively in mitochondria. These data are the first to indicate a mitochondrial role in alpha-tocopherol metabolism.
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Affiliation(s)
- Debbie J Mustacich
- Linus Pauling Institute, 571 Weniger Hall, Oregon State University, Corvallis, OR 97331, USA.
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Abstract
Nearly after one century of research and thousands of publications, the physiological function(s) of vitamin E remain unclear. Available evidence suggests a role in cell homeostasis that occurs through the modulation of specific signaling pathways and genes involved in proliferative, metabolic, inflammatory, and antioxidant pathways. Vitamin E presence in the human body is under close metabolic control so that only alpha-tocopherol and, to a lower extent, gamma-tocopherol are retained and delivered to tissues. Other vitamin E forms that are not retained in the body in significant amounts, exhibit responses in vitro that are different form those of alpha-tocopherol and may include tumor cell specific toxicity and apoptosis. These responses provide a therapeutic potential for these minor forms, either as such or metabolically modified, to produce bioactive metabolites. These cellular effects go beyond the properties of lipophilic antioxidant attributed to alpha-tocopherol particularly investigated for its alleged protective role in atherosclerosis or other oxidative stress conditions. Understanding signaling and gene expression effects of vitamin E could help assign a physiological role to this vitamin, which will be discussed in this review. Besides vitamin E signaling, attention will be given to tocotrienols as one of the emerging topics in vitamin E research and a critical re-examination of the most recent clinical trials will be provided together with the potential use of vitamin E in disease prevention and therapy.
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Affiliation(s)
- Francesco Galli
- Department of Internal Medicine, Laboratory of Clinical Biochemistry and Nutrition, University of Perugia, Perugia, Italy
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Abstract
Troglitazone was the first thiazolidinedione antidiabetic agent approved for clinical use in 1997, but it was withdrawn from the market in 2000 due to serious idiosyncratic hepatotoxicity. Troglitazone contains the structure of a unique chroman ring of vitamin E, and this structure has the potential to undergo metabolic biotransformation to form quinone metabolites, phenoxy radical intermediate, and epoxide species. Although troglitazone has been shown to induce apoptosis in various hepatic and nonhepatic cells, the involvement of reactive metabolites in the troglitazone cytotoxicity is controversial. Numerous toxicological tests, both in vivo and in vitro, have been used to try to predict the toxicity, but no direct mechanism has been demonstrated that can explain the hepatotoxicity that occurred in some individuals. This chapter summarizes the proposed mechanisms of troglitazone hepatotoxicity based in vivo and in vitro studies. Many factors have been proposed to contribute to the mechanism underlying this idiosyncratic toxicity.
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Affiliation(s)
- Tsuyoshi Yokoi
- Drug Metabolism and Toxicology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan.
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Abstract
Potential chemopreventive and therapeutic value of the lead Flexible Heteroarotinoid (Flex-Het), SHetA2, was indicated by growth inhibition of multiple cancer cell lines. The objective of this study was to evaluate the SHetA2 mechanism and in vivo activity in kidney cancer. SHetA2 induced apoptosis in the Caki-1 kidney cancer cell line through reduction of Bcl-2 protein and induction of PARP-1 and caspase 3 cleavages, whereas normal kidney epithelial cells exhibited resistance. Both normal and cancerous cells underwent G(1) arrest and loss of Cyclin D1. Tubule differentiation was induced in organotypic cultures and xenograft tumors in association with increases in E-Cadherin mRNA and protein expression. SHetA2 repressed activity of nuclear factor-κB, a transcription factor that regulates apoptosis, Bcl-2, growth, Cyclin D1, differentiation, and E-Cadherin in the opposite manner as SHetA2. Glutathione binding and generation of reactive oxygen species were not required for these activities. Oral SHetA2 inhibited growth in one of two renal cancer xenograft models without causing mortality or weight loss. Structure function analysis of related Flex-Hets for potential improvement of SHetA2 pharmaceutical properties showed that compounds with increased hydrophilicity slightly reduced the growth inhibition efficacy, but retained the differential effect on cancer over normal cells. Flex-Hets and metabolites were not mutagenic in the Ames test. In conclusion, SHetA2 regulates growth, differentiation, and apoptosis in kidney cancer cells through multiple molecular events downstream of nuclear factor-κB repression. Increasing the hydrophilicity of Flex-Hets does not attenuate the differential effect on cancer cells over normal cells, thus offering alternatives for improvement of therapeutic value.
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Affiliation(s)
- Tongzu Liu
- Department of Obstetrics and Gynecology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma 73104, USA
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Freiser H, Jiang Q. Gamma-tocotrienol and gamma-tocopherol are primarily metabolized to conjugated 2-(beta-carboxyethyl)-6-hydroxy-2,7,8-trimethylchroman and sulfated long-chain carboxychromanols in rats. J Nutr 2009; 139:884-9. [PMID: 19297424 PMCID: PMC2714389 DOI: 10.3945/jn.108.103309] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
The metabolism of gamma-tocotrienol (gamma-TE) and gamma-tocopherol (gamma-T) was investigated in human A549 cells and in rats. Similar to gamma-T, A549 cells metabolized gamma-TE to sulfated 9'-, 11'-, and 13'-carboxychromanol and their unconjugated counterparts. After 72-h incubation with the cells, 90% of long-chain carboxychromanols in the culture media from gamma-TE, but <45% from gamma-T, were in the sulfated form. The formation of these metabolites was further investigated in rats gavaged by gamma-TE at 10 or 50 mg/kg, gamma-T at 10 mg/kg, or tocopherol-stripped corn oil in controls. Six hours after a single dosing, the supplemented rats had increased plasma concentrations of 13'-carboxychromanol and sulfated 9'-, 11'-, 13'-carboxychromanol, whereas none of these metabolites were detectable in the controls. Sulfated 11'-carboxychromanol was the most abundant long-chain metabolite in gamma-TE-supplemented rats. Sulfatase/glucuronidase hydrolysis revealed for the first time that >88% 2-(beta-carboxyethyl)-6-hydroxychroman (gamma-CEHC), the terminal beta-oxidation metabolite, was in the conjugated form in the plasma. In all groups, conjugated gamma-CEHC accounted for >75% of total metabolites, whereas free CEHC was a minor metabolite. At 10 mg/kg, the plasma concentrations of total metabolites from gamma-TE-supplemented rats were higher (P < 0.05) than those from gamma-T-fed rats. These results demonstrate that in rats, conjugation such as sulfation occurs parallel to beta-oxidation in the liver and is quantitatively important to vitamin E metabolism. Conjugated long-chain carboxychromanols may be novel excreted metabolites during supplementation. Our data also provide in vivo evidence that gamma-TE is more extensively metabolized than gamma-T.
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Affiliation(s)
- Helene Freiser
- Department of Foods and Nutrition, Interdepartmental Nutrition Program, Purdue University, West Lafayette, IN 47907, USA
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Perales S, Barberá R, Lagarda MJ, Farré R. Antioxidant capacity of infant fruit beverages: influence of storage and in vitro gastrointestinal digestion. NUTR HOSP 2008; 23:547-553. [PMID: 19132262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2007] [Accepted: 05/07/2008] [Indexed: 05/27/2023] Open
Abstract
AIM The total antioxidant capacity of three beverages based on fruit juice, milk and cereals, intended for infants and young children up to 3 years of age was evaluated by two methods Trolox Equivalent Antioxidant Capacity and Oxygen Radical Absorption Capacity. RESULTS According to the total antioxidant values obtained by both methods, the beverages can be ranked as follows: grape-orange-banana > peach-apple > pineapple-banana. Ascorbic acid was the main contributor (60%) to the total antioxidant capacity, while the contribution of skimmed milk was less than 1.2%. After one month of storage at -20 degrees C, significant losses (p < 0.05) in total antioxidant capacity were found, though these were lower than 3% and therefore lacked nutritional significance. The bioaccessible fractions (maximum soluble fraction in simulated gastrointestinal media) of the beverages, obtained by in vitro gastrointestinal digestion, had antioxidant activities significantly lower (p < 0.05) than the original beverages, though the loss of antioxidant activity was always lower than 19%--thus indicating the stability of the total antioxidant capacity under the applied conditions. CONCLUSIONS The total antioxidant capacity values of the bioaccessible fraction show that most antioxidants are available for absorption after digestion, and might contribute to the beneficial effects attributed to antioxidants.
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Affiliation(s)
- S Perales
- Nutrition and Food Chemistry, Faculty of Pharmacy, University of Valencia, Valencia, Spain
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Liu Z, Zhang Y, Hua YF, Covey JM, Benbrook DM, Chan KK. Metabolism of a sulfur-containing heteroarotionoid antitumor agent, SHetA2, using liquid chromatography/tandem mass spectrometry. Rapid Commun Mass Spectrom 2008; 22:3371-3381. [PMID: 18837006 DOI: 10.1002/rcm.3744] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
SHetA2 {[(4-nitrophenyl)amino][2,2,4,4-tetramethylthiochroman-6-yl)amino]methanethione], NSC 726189}, a sulfur-containing heteroarotinoid, selectively inhibits cancer cell growth and induces apoptosis without activation of nuclear retinoic acid receptors (RARs). The objective of this study was to investigate its in vitro metabolism in rat and human liver microsomes and in vivo metabolism in the mouse and rat using liquid chromatography-ultraviolet/multi-stage mass spectrometry (LC-UV/MS(n)) on an ion-trap mass spectrometer coupled with a photo-diode array (PDA) detector. In vitro, in the absence of glutathione (GSH), oxidation of the four aliphatic methyl groups of SHetA2 yielded one mono-, two di-, and one tri-hydroxylated SHetA2 metabolites, which were identified based on their UV and multi-stage mass spectra. In the presence of GSH, in addition to these primary oxidative metabolites, four GSH adducts of SHetA2 and a novel rare form thioether GSH adduct was detected and characterized. In vivo, the monohydroxylated SHetA2 metabolites were also detected in mouse and rat plasma and two GSH adducts were detected in rat liver following intravenous (i.v.) bolus administration of SHetA2 at 40 mg/kg.
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Affiliation(s)
- Zhongfa Liu
- College of Pharmacy, The Ohio State University, Columbus, OH 43210, USA
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Gan J, Qu Q, He B, Shyu WC, Rodrigues AD, He K. Troglitazone thiol adduct formation in human liver microsomes: enzyme kinetics and reaction phenotyping. Drug Metab Lett 2008; 2:184-189. [PMID: 19356091 DOI: 10.2174/187231208785425773] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Troglitazone (TGZ) induced hepatotoxicity has been linked to cytochrome P450 (CYP)-catalyzed reactive metabolite formation. Therefore, the kinetics and CYP specificity of reactive metabolite formation were studied using dansyl glutathione (dGSH) as a trapping agent after incubation of TGZ with human liver microsomes (HLM) and recombinant human CYP proteins. CYP2C8 exhibited the highest rate of TGZ adduct (TGZ-dGS) formation, followed by CYP3A4, CYP3A5, and CYP2C19. The involvement of CYP2C8 and CYP3A4 was confirmed with CYP form-selective chemical inhibitors. The impact of TGZ concentration on the rate of TGZ-dGS formation was also evaluated. In this instance, two distinctly different profiles were observed with recombinant CYP3A4 and CYP2C8. It is concluded that both CYP3A4/5 and CYP2C8 play a major role in the formation of TGZ adduct in HLM. However, the contribution of these CYPs varies depending on their relative expression and the concentration of TGZ.
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Affiliation(s)
- Jinping Gan
- Department of Pharmaceutical Candidate Optimization, Bristol-Myers Squibb Research and Development, Princeton, NJ 08543, USA.
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Donchenko HV, Kumchenko OB, Petukhov DM, Palyvoda OM, Chernukhina LO. [Intensity of metabolism processes and ubiquinone and ubichromenol content in the liver of rats in A,E-hypovitaminosis]. Ukr Biokhim Zh (1999) 2008; 80:105-113. [PMID: 19140456] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The paper is dedicated to the study of peculiarities of ubiquinone and ubichromenol distribution and metabolism in subcellular fractions of rats' liver under A,E-hypovitaminosis. It is shown, that dietary deprivation of vitamins A and E leads to a sharp decrease in intensity of CoQ biosynthesis in rats' liver tissue and to its intracellular redistribution. Under these circumstances the observed decrease in the inclusion of labelled tyrosine in rats' liver CoQ under A,E-hypovitaminosis may be really caused by dietary deprivation of vitamin E.
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Nigro J, Potter-Perigo S, Ivey ME, de Dios ST, Evanko SP, Wight TN, Little PJ. The effect of PPAR ligands to modulate glucose metabolism alters the incorporation of metabolic precursors into proteoglycans synthesized by human vascular smooth muscle cells. Arch Physiol Biochem 2008; 114:171-7. [PMID: 18629682 DOI: 10.1080/13813450802181013] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
PPAR ligands are important effectors of energy metabolism and can modify proteoglycan synthesis by vascular smooth muscle cells (VSMCs). Describing the cell biology of these important clinical agents is important for understanding their full clinical potential, including toxicity. Troglitazone (10 microM) and fenofibrate (30 microM) treatment of VSMCs reduces ((35)S)-sulphate incorporation into proteoglycans due to a reduction of glycosaminoglycan (GAG) chain length. Conversely, under physiological glucose conditions (5.5 mM), the same treatment increases ((3)H)-glucosamine incorporation into GAGs. This apparent paradox is the consequence of an increase in the intracellular ((3)H)-galactosamine specific activity from 48.2 +/- 3.2 microCi/ micromol to 90.7 +/- 11.0 microCi/ micromol (P < 0.001) and 57.1 +/- 2.6 microCi/ micromol (P < 0.05) when VSMCs were treated with troglitazone and fenofibrate, respectively. The increased specific activity observed with troglitazone (10 microM) treatment correlates with a two-fold increase in glucose consumption, while fenofibrate (50 microM) treatment showed a modest (14.6%) increase in glucose consumption. We conclude that the sole use of glucosamine precursors to assess GAG biosynthesis results in misleading conclusions when assessing the effect of PPAR ligands on VSMC proteoglycan biosynthesis.
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Affiliation(s)
- Julie Nigro
- CSIRO, Molecular and Health Technologies, Bayview Avenue, Clayton, Victoria 3168, Australia
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Iwasaki Y, Takayasu S, Nishiyama M, Tsugita M, Taguchi T, Asai M, Yoshida M, Kambayashi M, Hashimoto K. Is the metabolic syndrome an intracellular Cushing state? Effects of multiple humoral factors on the transcriptional activity of the hepatic glucocorticoid-activating enzyme (11beta-hydroxysteroid dehydrogenase type 1) gene. Mol Cell Endocrinol 2008; 285:10-8. [PMID: 18313835 DOI: 10.1016/j.mce.2008.01.012] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/28/2007] [Revised: 11/16/2007] [Accepted: 01/07/2008] [Indexed: 10/22/2022]
Abstract
Although glucocorticoid, as "gluco-" literally implies, plays an important role in maintaining the blood glucose level, excess of glucocorticoid production/action is known to cause impaired glucose tolerance and diabetes. Since 11beta-hydroxysteroid dehydrogenase type 1 (11beta-HSD1), which converts inactive cortisone to active cortisol, is primarily expressed in the liver, an enhanced expression of the enzyme may increase the intracellular glucocorticoid level and thus increase the hepatic glucose production. In this study, we examined the effects of multiple humoral factors related to the metabolic syndrome on the transcriptional activity of 11beta-HSD1 gene in hepatocytes in vitro. We found that, among the factors examined, adipocyte-derived cytokines (adipokines), like TNFalpha and IL-1beta, potently stimulated the transcriptional activity of 11beta-HSD1 gene in human HuH7 cells. In contrast, only minimal effects of other humoral factors were observed when they were used alone. Interestingly, however, when applied in combination, they synergistically enhanced the transcriptional activity of 11beta-HSD1 gene. They also potentiated the effects of cytokines. Glucocorticoid receptor (GR)-dependent transcription was indeed increased even with an inactive glucocorticoid cortisone following TNFalpha pretreatment, indicating the enhanced intracellular conversion. Finally, PPARgamma/PPARalpha agonists, clinically used as anti-diabetic drugs, significantly inhibited the transcriptional activity of 11beta-HSD1. Altogether, our data strongly suggest that combination of the humoral factors related to the metabolic syndrome, including the adipokines, synergistically enhances the hepatic expression of 11beta-HSD1 gene and causes the intracellular Cushing state in the liver by increasing the intracellular glucocorticoid level. We assume that the observed synergistic effects of these factors on 11beta-HSD1 may, at least partly, explain the reason whereby accumulation of the multiple risk factors facilitates the derangement of glucose and lipid metabolism in the metabolic syndrome.
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Affiliation(s)
- Yasumasa Iwasaki
- Department of Endocrinology, Metabolism, and Nephrology, Kochi Medical School, Kochi University, Nankoku, Japan.
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Abstract
Ubichromanol-9 (UCa9), with a side chain consisting of nine isoprene units) is a reductive cyclization product of ubiquinone-10 (UQ10). It acts as a radical scavenging antioxidant and is about half as effective as alpha-tocopherol. Already decades ago its one-electron oxidation product, the ubichromanoxyl radical had been identified. However, nothing was known so far about the two-electron oxidation product of this antioxidant and its bioactivity. This study proves that ubichromanol can be oxidized to a ubiquinone-like compound with a hydroxyl-substituted side chain (UQ10OH), a metabolite that is naturally present in bovine liver mitochondria. The bioactivity of this ubiquinone derivative in its reduced form as substrate for mitochondrial complex III (cytochrome bc1 complex) was slightly below that of native ubiquinol, but significantly higher than that of reduced alpha-tocopheryl quinone. Since ubiquinone-like molecules (UQ10OH, UQ10) were identified as oxidation products of UCa9 during lipid peroxidation, this ubiquinone derivative could provide a possibility to combine antioxidant properties of chromanols and bioenergetic benefits of UQ10.
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Affiliation(s)
- Lars Gille
- Molecular Pharmacology and Toxicology Unit, Department of Natural Sciences, University of Veterinary Medicine Vienna, Vienna, Austria.
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48
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CRISOSTOMO ANAG, MORENO RAPHAELB, NAVARATNAM SUPPIAH, WILKINSON JAMESA, BISBY ROGERH. Generation of superoxide and singlet oxygen from alpha-tocopherolquinone and analogues. Free Radic Res 2007; 41:730-7. [PMID: 17516246 PMCID: PMC2080821 DOI: 10.1080/10715760701324075] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Three potential routes to generation of reactive oxygen species (ROS) from alpha-tocopherolquinone (alpha-TQ) have been identified. The quinone of the water-soluble vitamin E analogue Trolox C (Trol-Q) is reduced by hydrated electron and isopropanol alpha-hydroxyalkyl radical, and the resulting semiquinone reacts with molecular oxygen to form superoxide with a second order rate constant of 1.3 x 10(8) dm(3)/mol/s, illustrating the potential for redox cycling. Illumination (UV-A, 355 nm) of the quinone of 2,2,5,7,8-pentamethyl-6-hydroxychromanol (PMHC-Q) leads to a reactive short-lived (ca. 10(- 6) s) triplet state, able to oxidise tryptophan with a second order rate constant greater than 10(9) dm(3)/mol/s. The triplet states of these quinones sensitize singlet oxygen formation with quantum yields of about 0.8. Such potentially damaging reactions of alpha-TQ may in part account for the recent findings that high levels of dietary vitamin E supplementation lack any beneficial effect and may lead to slightly enhanced levels of overall mortality.
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Affiliation(s)
- ANA G CRISOSTOMO
- Biomedical Sciences Research Institute, University of Salford, Salford M5 4WT, UK
| | - RAPHAEL B MORENO
- Biomedical Sciences Research Institute, University of Salford, Salford M5 4WT, UK
| | - SUPPIAH NAVARATNAM
- Biomedical Sciences Research Institute, University of Salford, Salford M5 4WT, UK
- FRRF, CCLRC Daresbury Laboratory, Warrington WA4 4AD, UK
| | - JAMES A WILKINSON
- Biomedical Sciences Research Institute, University of Salford, Salford M5 4WT, UK
| | - ROGER H BISBY
- Biomedical Sciences Research Institute, University of Salford, Salford M5 4WT, UK
- Correspondence: Roger Bisby, Biomedical Sciences Research Institute, Peel Building, University of Salford, Salford M5 4WT, UK. Fax 0161 295 5015. Email
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Gillilan RE, Ayers SD, Noy N. Structural basis for activation of fatty acid-binding protein 4. J Mol Biol 2007; 372:1246-60. [PMID: 17761196 PMCID: PMC2032018 DOI: 10.1016/j.jmb.2007.07.040] [Citation(s) in RCA: 127] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2007] [Revised: 07/16/2007] [Accepted: 07/17/2007] [Indexed: 12/30/2022]
Abstract
Fatty acid-binding protein 4 (FABP4) delivers ligands from the cytosol to the nuclear receptor PPARgamma in the nucleus, thereby enhancing the transcriptional activity of the receptor. Notably, FABP4 binds multiple ligands with a similar affinity but its nuclear translocation is activated only by specific compounds. To gain insight into the structural features that underlie the ligand-specificity in activation of the nuclear import of FABP4, we solved the crystal structures of the protein complexed with two compounds that induce its nuclear translocation, and compared these to the apo-protein and to FABP4 structures bound to non-activating ligands. Examination of these structures indicates that activation coincides with closure of a portal loop phenylalanine side-chain, contraction of the binding pocket, a subtle shift in a helical domain containing the nuclear localization signal of the protein, and a resultant change in oligomeric state that exposes the nuclear localization signal to the solution. Comparisons of backbone displacements induced by activating ligands with a measure of mobility derived from translation, libration, screw (TLS) refinement, and with a composite of slowest normal modes of the apo state suggest that the helical motion associated with the activation of the protein is part of the repertoire of the equilibrium motions of the apo-protein, i.e. that ligand binding does not induce the activated configuration but serves to stabilize it. Nuclear import of FABP4 can thus be understood in terms of the pre-existing equilibrium hypothesis of ligand binding.
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Affiliation(s)
- Richard E. Gillilan
- Macromolecular Diffraction Facility of the Cornell High-Energy Synchrotron Source, Ithaca, NY 14853
| | - Stephen D. Ayers
- Division of Nutritional Sciences, Cornell University, Ithaca, NY 14853
| | - Noa Noy
- Division of Nutritional Sciences, Cornell University, Ithaca, NY 14853
- Department of Pharmacology, Case Western Reserve School of Medicine, Cleveland, OH 44106
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Fawcett RJ, Osborne NN. Flupirtine attenuates sodium nitroprusside-induced damage to retinal photoreceptors, in situ. Brain Res Bull 2007; 73:278-88. [PMID: 17562394 DOI: 10.1016/j.brainresbull.2007.04.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2007] [Revised: 04/16/2007] [Accepted: 04/17/2007] [Indexed: 12/17/2022]
Abstract
Flupirtine has been shown to function as a neuroprotectant and is presently used in man to treat a number of conditions. The aim of this study was to investigate the specific antioxidant properties of flupirtine in relation to oxidant-induced damage to retinal photoreceptors. Initial in vitro studies on brain membranes showed that flupirtine was approximately 20 times more potent than trolox (vitamin E analogue) and 8 times more potent than metipranolol at attenuating lipid peroxidation caused by the nitric oxide donor, sodium nitroprusside (SNP). Subsequent immunohistochemical studies revealed that following an intraocular injection of SNP, retinal photoreceptors are the only retinal cell types that appear to be clearly affected. This was supported by electroretinogram (ERG) recordings which showed both the a- and b-wave amplitudes to be significantly reduced. Western blotting techniques showed that SNP caused a significant decrease in photoreceptor-specific markers (RET-P1, rhodopsin kinase), an increase in cleaved caspase-3, Bcl-2, and cleaved PARP proteins that are associated with apoptosis and no change in the ganglion cell specific marker, neurofilament (NF-L). This was supported by RT-PCR data where rhodopsin (photoreceptor specific) mRNA was reduced while Thy-1 and NF-L (ganglion cell specific) mRNAs were unaffected. In addition SNP caused an elevation of glial cell response mRNAs primarily associated with Müller cells (GFAP, CNTF, bFGF) as well as caspase-3 and Bcl-2. Importantly, when flupirtine was co-injected, the effects to the retina caused by SNP on retinal proteins and mRNAs were in most cases significantly blunted. The conclusion reached from this study is that flupirtine is a powerful antioxidant and when injected into the eye with SNP attenuates the detrimental influence of SNP to retinal photoreceptors. Since oxidative stress has been implicated in retinal diseases like age-related macular degeneration (AMD) this study provides "proof of principle" for the idea that flupirtine may help individuals suffering from such retinal diseases.
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Affiliation(s)
- R J Fawcett
- Nuffield Laboratory of Ophthalmology, Oxford University, Walton Street, Oxford OX2 6AW, UK
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