Flavones As Colorectal Cancer Chemopreventive Agents—Phenol-O- Methylation Enhances Efficacy

Total Page:16

File Type:pdf, Size:1020Kb

Flavones As Colorectal Cancer Chemopreventive Agents—Phenol-O- Methylation Enhances Efficacy Published OnlineFirst July 28, 2009; DOI: 10.1158/1940-6207.CAPR-09-0081 Published Online First on July 28, 2009 as 10.1158/1940-6207.CAPR-09-0081 Cancer Prevention Research Flavones as Colorectal Cancer Chemopreventive Agents—Phenol-O- Methylation Enhances Efficacy Hong Cai,1 Stewart Sale,1 Ralf Schmid,2 Robert G. Britton,1 Karen Brown,1 William P. Steward1 and Andreas J. Gescher1 Abstract Flavonoids occur ubiquitously in plants, and some possess preclinical cancer chemopre- ventive activity. Little is known about molecular features that mediate chemopreventive ef- ficacy of flavonoids. Here, three related flavones, apigenin (4′,5,7-trihydroxyflavone), tricin (4′,5,7-trihydroxy-3′,5′-dimethoxyflavone), and 3′,4′,5′,5,7-pentamethoxyflavone (PMF), were compared in terms of their effects on (a) adenoma development in ApcMin mice, a model of human gastrointestinal malignancies; (b) growth of APC10.1 mouse adenoma cells in vitro; and (c) prostaglandin E-2 generation in HCA-7 human-derived colorectal cancer cells in vitro. Life-long consumption of PMF with the diet at 0.2% reduced ApcMin mouse adenoma number and burden by 43% and 61%, respectively, whereas apigenin was inactive. Tricin has previ- ously shown activity in this model. IC50 values for murine adenoma cell growth inhibition by PMF, tricin, and apigenin were 6, 13, and 18 μmol/L, respectively. In ApcMin mice that received flavones (0.2%) for 4 weeks, adenoma cell proliferation as reflected by Ki-67 staining was re- duced by PMF and tricin, but not by apigenin. On incubation with HCA-7 cells for 6 hours, PMF reduced prostaglandin E-2 generation with an IC50 of 0.8 μmol/L, a fraction of the respective values reported for tricin or apigenin. In silico PMF docked into the cyclooxygenase active site with greater affinity than tricin or apigenin. The results suggest that the rank order of cancer chemopreventive efficacy in ApcMin mice is PMF > tricin > apigenin, supporting the notion that the presence of O-methyl in the flavone molecular scaffold promotes gastrointestinal cancer chemopreventive efficacy. Flavonoids are polyphenolic phytochemicals that occur ubiq- ity on flavonoids would allow prioritization of agents for uitously in the leaves, seeds, bark, and flowers of plants, many preclinical development, but such information is extremely of which are consumed with the diet. Certain flavonoids ex- scarce. The flavone tricin (4′,5,7-trihydroxy-3′,5′-dimethoxy- emplified by the flavonol epigallocatechin-3-gallate contained flavone; Fig. 1) contained in rice bran and other grass species in green tea, the isoflavone genistein from soya, and the flavo- has recently been shown to interfere with small intestinal car- nol quercetin found in apples and onions have been the focus cinogenesis in the ApcMin mouse (4), a model of the human of considerable research interest as they can prevent malig- heritable condition familial adenomatous polyposis coli (5). nancies in rodent models of prostate, breast, or gastrointesti- Tricin inhibited prostaglandin E-2 (PGE-2) generation in colo- nal carcinogenesis (1–3). More than 4,000 flavonoids have rectal cells in vitro and in ApcMin mice in vivo (4). PGE-2 is gen- been identified to date, and only a handful of which, including erated from arachidonic acid via the cyclooxygenase (COX) epigallocatechin-3-gallate, genistein, and quercetin, have been pathway. Inhibition and/or down-regulation of components investigated in depth. The putative cancer chemopreventive of this pathway, especially of the isoenzyme COX-2, are con- properties of most flavonoids are virtually unknown. Knowl- sidered to be important mechanisms of colorectal cancer che- edge of molecular features that impart anticarcinogenic activ- moprevention (6). Recently, methoxy moieties have been characterized as phar- macophor imparting anticarcinogenic properties onto fla- vones. 5,7-Dimethoxyflavone and 5,7,4′-trimethoxyflavone Authors' Affiliations: 1Cancer Biomarkers and Prevention Group, Department of Cancer Studies and Molecular Medicine and 2Department of Biochemistry, were superior to their hydroxy congeners in terms of systemic University of Leicester, Leicester, United Kingdom availability in rats and ability to inhibit oral cancer cell prolif- Received 3/19/09; revised 4/18/09; accepted 5/5/09; published OnlineFirst 7/28/09. eration in vitro (7). The latter finding implies an intrinsic advan- Grant support: Cancer Research UK grant C325/A6691. Note: H. Cai and S. Sale contributed equally to this work. tage of methoxylated flavones over hydroxylated ones in terms Requests for reprints: Andreas J. Gescher, Department of Cancer Studies of growth-inhibitory properties. In the light of all this evidence, and Molecular Medicine, University of Leicester, Robert Kilpatrick Clinical we wished to explore the role of phenyl methyl ether moieties Sciences Building, Leicester LE2 7LX, United Kingdom. Phone: 44- in the adenoma-preventive efficacy of flavones in the ApcMin 1162231856; Fax: 44-1162231855; E-mail: [email protected]. ©2009 American Association for Cancer Research. mouse. Two analogues of tricin differing in O-methylation doi:10.1158/1940-6207.CAPR-09-0081 status were selected, apigenin (4′,5,7-trihydroxyflavone) and www.aacrjournals.org 743 Cancer Prev Res 2009;2(8) August 2009 Downloaded from cancerpreventionresearch.aacrjournals.org on September 28, 2021. © 2009 American Association for Cancer Research. Published OnlineFirst July 28, 2009; DOI: 10.1158/1940-6207.CAPR-09-0081 Cancer Prevention Research ApcMin mice that received flavones with their diet for the fi- nal month of their life. Third, the ability of the flavones to compromise PGE-2 generation, a potential mechanism of their chemopreventive action, was compared in human colo- rectal cancer cells in vitro. In addition, differences between the three flavones in affinity for COX enzymes, which cata- lyze arachidonic acid metabolism to generate PGE-2, were explored in silico. Overall, the work was designed to help de- fine criteria that aid prioritization of flavones for colorectal cancer chemoprevention agent development. Materials and Methods Materials PMF was synthesized as described before (13) by condensing 2′-hy- droxy-4′,6′-dimethoxyacetophenone with 3,4,5-trimethoxybenzoyl chloride in pyridine. The resulting trimethoxybenzoate was subjected to Baker-Venkataraman migration to obtain a β-diketone, which was cyclized to the flavone. The identity of PMF was confirmed by the ap- propriate melting point and spectrometric/spectroscopic data, and it was >99% pure by high-performance liquid chromatography analysis (14). Apigenin was purchased from Apin Chemical Co. Tricin was cus- tom synthesized by Syncom. For the cell culture experiments, flavones were dissolved in DMSO, and the final DMSO concentration in cellu- lar incubations was 0.1%. All other chemicals were purchased from Sigma-Aldrich Chemical Co. Animals and interventions Breeding colonies were established in the Leicester University Bio- medical Services facility using C57BL/6J Min/+ (ApcMin) mice origi- nally obtained from The Jackson Laboratory. Ear tissue from newborn mice was genotyped for the presence of the mutation using PCR as described previously (15). Experiments were carried out under animal project license PPL 80/2167, granted to Leicester University by the UK Home Office. The experimental design was vetted by the Leicester University Local Ethical Committee for Animal Experimentation Fig. 1. Chemical structures of flavones used in this study. and met the standards required by the United Kingdom Coordinating Committee on Cancer Research guidelines (16). ApcMin mice (14-25 per group) received standard American Institute of Nutrition-93G (AIN- 3′,4′,5′,5,7-pentamethoxyflavone (PMF; for structures, see 93G) diet or AIN-93G diet supplemented with flavone. In the case of Fig. 1), and their effects were compared with those of tricin. the long-term intervention study, animals received apigenin at a die- Apigenin, des-dimethoxy tricin, occurs in many leafy vegeta- tary concentration of 0.2%, or PMF at 0.05% or 0.2%, from week 4 to bles and fruits and is reported to possess cancer chemopreven- the end of the their life (week 16). Both agents were investigated in tive properties (8). PMF, fully O-methylated tricin, has been two separate experiments with their own controls. In the study to as- found in the leaves of Murraya paniculata,aconstituentof sess the effect of flavones on proliferation of established adenomas, traditional Indonesian herbal medicines (9), and fruits of ApcMin mice received standard AIN-93G diet until week 12 after the Brazilian Neoraputia magnifica (10), both plants being weaning and then diet containing apigenin, tricin, or PMF (0.2%) up members of the Rutaceae plant family. The only pharmaco- to week 16. Dietary doses of 0.2% and 0.05% equate to approximately logic property of PMF reported thus far is its ability to re- 300 and 75 mg/kg murine body weight, respectively. Animals were culled by cardiac exsanguination under halothane anesthesia in week verse P-glycoprotein–mediated multidrug resistance in 16. The intestinal tract was removed and flushed with PBS. Intestinal cancer cells (11). The hypothesis was tested that apigenin is tissue was cut open longitudinally, and multiplicity, location, and size less, and PMF more, capable than tricin of interfering with of adenomas were recorded as described previously (15) using a mag- adenoma development, as a consequence of the relative nifying glass (×5). Polyp volume was derived
Recommended publications
  • 6-Hydroxyflavones and Other Flavonoids of Crocus Jeffrey B
    6-Hydroxyflavones and Other Flavonoids of Crocus Jeffrey B. Harborne and Christine A. Williams Phytochemical Unit, Department of Botany, University of Reading. Reading. RG 6 2AS. England Z. Naturforsch. 39c, 18-23 (1984); received N ovem ber 14. 1983 Iridaceae, Crocus, Flavonoids. Kaempferol Glycosides, Chemotaxonomy. 6 -Hydroxyflavones have been identified for the first time in the Iridaceae, in leaves of three Crocus species. Three new glycosides have been characterised: 6 -hydroxyluteolin 7-rhamnosyl- glucoside, scutellarein 7-glucoside and scutellarein 7-methyl ether 6 -glucoside, as well as two known glycosides: 6 -hydroxyluteolin 7-glucoside and 6 -hydroxyluteolin 7-methyl ether 6 - glucoside. 6 -Hydroxyluteolin and scutellarein glycosides have been found before in Bromeliaceae. Commelinaceae, Cyperaceae and Orchidaceae, but this is the first record of the respective 7-methyl ethers in the Monocotyledoneae. Acacetin and tricin have been identified as aglycones in C. laevigatus and C. heuffelianus leaves, respectively and the occurrence of mangiferin confirmed in C. aureus leaves. Two of the major flavonol glycosides present in flowers of cultivated species were identified as kaempferol 3-sophoroside and kaempferol 3- rutinoside-7-glucoside. However none of the flavonoids identified appears to contribute to yellow petal colour in Crocus, which is probably entirely carotenoid-based. Introduction of these compounds and the classification of the genus according to Maw [5], but some evidence As part of a continuing chemotaxonomic survey was obtained of a relationship between chemistry of flavonoids in families of the Monocotyledoneae and geography, especially among the Eastern and [see e.g. 1, 2], our attention has turned to the Western Mediterranean species [6], Iridaceae, which contains some 60 genera and 800 Two of the main reasons why the flavonoids of species.
    [Show full text]
  • Shilin Yang Doctor of Philosophy
    PHYTOCHEMICAL STUDIES OF ARTEMISIA ANNUA L. THESIS Presented by SHILIN YANG For the Degree of DOCTOR OF PHILOSOPHY of the UNIVERSITY OF LONDON DEPARTMENT OF PHARMACOGNOSY THE SCHOOL OF PHARMACY THE UNIVERSITY OF LONDON BRUNSWICK SQUARE, LONDON WC1N 1AX ProQuest Number: U063742 All rights reserved INFORMATION TO ALL USERS The quality of this reproduction is dependent upon the quality of the copy submitted. In the unlikely event that the author did not send a com plete manuscript and there are missing pages, these will be noted. Also, if material had to be removed, a note will indicate the deletion. uest ProQuest U063742 Published by ProQuest LLC(2017). Copyright of the Dissertation is held by the Author. All rights reserved. This work is protected against unauthorized copying under Title 17, United States C ode Microform Edition © ProQuest LLC. ProQuest LLC. 789 East Eisenhower Parkway P.O. Box 1346 Ann Arbor, Ml 48106- 1346 ACKNOWLEDGEMENT I wish to express my sincere gratitude to Professor J.D. Phillipson and Dr. M.J.O’Neill for their supervision throughout the course of studies. I would especially like to thank Dr. M.F.Roberts for her great help. I like to thank Dr. K.C.S.C.Liu and B.C.Homeyer for their great help. My sincere thanks to Mrs.J.B.Hallsworth for her help. I am very grateful to the staff of the MS Spectroscopy Unit and NMR Unit of the School of Pharmacy, and the staff of the NMR Unit, King’s College, University of London, for running the MS and NMR spectra.
    [Show full text]
  • Potential Role of Flavonoids in Treating Chronic Inflammatory Diseases with a Special Focus on the Anti-Inflammatory Activity of Apigenin
    Review Potential Role of Flavonoids in Treating Chronic Inflammatory Diseases with a Special Focus on the Anti-Inflammatory Activity of Apigenin Rashida Ginwala, Raina Bhavsar, DeGaulle I. Chigbu, Pooja Jain and Zafar K. Khan * Department of Microbiology and Immunology, and Center for Molecular Virology and Neuroimmunology, Center for Cancer Biology, Institute for Molecular Medicine and Infectious Disease, Drexel University College of Medicine, Philadelphia, PA 19129, USA; [email protected] (R.G.); [email protected] (R.B.); [email protected] (D.I.C.); [email protected] (P.J.) * Correspondence: [email protected] Received: 28 November 2018; Accepted: 30 January 2019; Published: 5 February 2019 Abstract: Inflammation has been reported to be intimately linked to the development or worsening of several non-infectious diseases. A number of chronic conditions such as cancer, diabetes, cardiovascular disorders, autoimmune diseases, and neurodegenerative disorders emerge as a result of tissue injury and genomic changes induced by constant low-grade inflammation in and around the affected tissue or organ. The existing therapies for most of these chronic conditions sometimes leave more debilitating effects than the disease itself, warranting the advent of safer, less toxic, and more cost-effective therapeutic alternatives for the patients. For centuries, flavonoids and their preparations have been used to treat various human illnesses, and their continual use has persevered throughout the ages. This review focuses on the anti-inflammatory actions of flavonoids against chronic illnesses such as cancer, diabetes, cardiovascular diseases, and neuroinflammation with a special focus on apigenin, a relatively less toxic and non-mutagenic flavonoid with remarkable pharmacodynamics. Additionally, inflammation in the central nervous system (CNS) due to diseases such as multiple sclerosis (MS) gives ready access to circulating lymphocytes, monocytes/macrophages, and dendritic cells (DCs), causing edema, further inflammation, and demyelination.
    [Show full text]
  • Methylation of Dietary Flavones Increases Their Metabolic Stability and Chemopreventive Effects
    Int. J. Mol. Sci. 2009, 10, 5002-5019; doi:10.3390/ijms10115002 OPEN ACCESS International Journal of Molecular Sciences ISSN 1422-0067 www.mdpi.com/journal/ijms Review Methylation of Dietary Flavones Increases Their Metabolic Stability and Chemopreventive Effects Thomas Walle Department of Cell and Molecular Pharmacology and Experimental Therapeutics, Medical University of South Carolina, Charleston, SC 29425, USA; E-Mail: [email protected]; Tel.: +1-843-795-3492 Received: 30 October 2009 / Accepted: 16 November 2009 / Published: 18 November 2009 Abstract: Dietary flavones have promising chemoprotective properties, in particular with regard to cancer, but problems with low oral bioavailability and sometimes unacceptable toxicity have made their use as protective additives to normal diets questionable. However, methylation of free phenolic hydroxyl groups leads to derivatives not susceptible to glucuronic acid or sulfate conjugation, resulting in increased metabolic stability. Methylation also leads to greatly improved transport through biological membranes, such as in intestinal absorption, and much increased oral bioavailability. Recent studies also indicate that methylation results in derivatives with increasing potency to kill cancer cells. They also show high potency towards inhibition of hormone-regulating enzymes, e.g., aromatase, important in the causation of breast cancer. Methylation of the flavones may also result in derivatives with diminished toxic side-effects and improved aqueous solubility. In conclusion, it appears that methylation of dietary flavones as well as of other food products may produce derivatives with much improved health effects. Keywords: flavonoids; methylation; methoxyflavones; cancer prevention 1. Introduction Dietary flavonoids and other polyphenols have long been considered potential chemoprotective agents, mainly in cardiovascular disease and cancer but also in many other disease conditions [1].
    [Show full text]
  • Fluorescence Properties of Hydroxy- and Methoxyflavones and the Effect of Shift Reagents
    Fluorescence Properties of Hydroxy- and Methoxyflavones and the Effect of Shift Reagents Otto S. Wolfbeis*a, Monowara Begum2, and Hans Geigerb a Institut für Organische Chemie, KF-Universität, A-8010 Graz, Austria b Institut für Chemie der Universität Hohenheim, D-7000 Stuttgart, West Germany Z. Naturforsch. 39b, 231 — 237 (1984); received September 23, 1983 Flavonoids, Fluorescence, Structure Elucidation, Shift Reagents The fluorescence spectra of 42 hydroxy- and methoxyflavones in methanol solution have been investigated. The following findings are considered to be useful in structure elucidation and identification of flavonoids: (a) The maxima of the absorption and fluorescence bands give, in most cases, a unique combination; (b) flavones exhibit exceptionally large Stokes’ shifts (6,800 to 10,000 cm-1); (c) most flavones fluoresce blue, but flavonols fluoresce yellow or green; the fluorescence of flavonols consists frequently of two bands; (d) fluorescence is zero or very weak for 5-hydroxyflavones; (e) 5-hydroxyflavones become increasingly fluorescent with in increasing number of oxygen functions being present in the molecule; a 3-hydroxy group has a particular beneficial effect; (f) hydroxyflavones fluoresce less intense than the corresponding methoxy­ flavones; (g) fluorescence intensity is distinctly higher in polar protic than in apolar solvents. The effects of three groups of shift reagents on the spectra has also been investigated. The first group involves water, 10% and 50% sulphuric acid. The second group consists of basic
    [Show full text]
  • Dr. Duke's Phytochemical and Ethnobotanical Databases List of Chemicals for Cataracts
    Dr. Duke's Phytochemical and Ethnobotanical Databases List of Chemicals for Cataracts Chemical Activity Count (+)-ALPHA-VINIFERIN 2 (+)-CATECHIN 5 (+)-CORYDALINE 1 (+)-EUDESMA-4(14),7(11)-DIENE-3-ONE 1 (+)-GALLOCATECHIN 1 (+)-GLAUCINE 1 (+)-HERNANDEZINE 1 (+)-ISOCORYDINE 1 (+)-PSEUDOEPHEDRINE 1 (+)-SYRINGARESINOL 1 (+)-SYRINGARESINOL-DI-O-BETA-D-GLUCOSIDE 1 (-)-16,17-DIHYDROXY-16BETA-KAURAN-19-OIC 1 (-)-ALPHA-BISABOLOL 1 (-)-BETONICINE 1 (-)-BISPARTHENOLIDINE 1 (-)-BORNYL-CAFFEATE 2 (-)-BORNYL-FERULATE 2 (-)-BORNYL-P-COUMARATE 2 (-)-DANSHEXINKUN 1 (-)-EPIAFZELECHIN 1 (-)-EPICATECHIN 3 (-)-EPICATECHIN-3-O-GALLATE 1 (-)-EPIGALLOCATECHIN 2 (-)-EPIGALLOCATECHIN-3-O-GALLATE 1 (-)-EPIGALLOCATECHIN-GALLATE 4 (-)-HYDROXYJASMONIC-ACID 1 (-)-STYLOPINE 1 Chemical Activity Count (-)-TETRAHYDROCOLUMBAMINE 1 (1'S)-1'-ACETOXYCHAVICOL-ACETATE 2 (15:1)-CARDANOL 1 (2R)-(12Z,15Z)-2-HYDROXY-4-OXOHENEICOSA-12,15-DIEN-1-YL-ACETATE 1 (3'R,4'R)-3'-EPOXYANGELOYLOXY-4'-ACETOXY-3',4'-DIHYDROSESELIN 1 (7R,10R)-CAROTA-1,4-DIENALDEHYDE 1 (E)-4-(3',4'-DIMETHOXYPHENYL)-BUT-3-EN-OL 2 1,2,3,6-TETRA-O-GALLYOL-BETA-D-GLUCOSE 1 1,2,6-TRI-O-GALLOYL-BETA-D-GLUCOSE 1 1,3,6-TRIHYDROXY-2,7-DIMETHOXY-XANTHONE 1 1,6,7-TRIHYDROXY-2,3-DIMETHOXY-XANTHONE 1 1,7-BIS(3,4-DIHYDROXYPHENYL)HEPTA-4E,6E-DIEN-3-ONE 1 1,7-BIS-(4-HYDROXYPHENYL)-1,4,6-HEPTATRIEN-3-ONE 1 1,8-CINEOLE 3 1-HYDROXY-3,6,7-TRIMETHOXY-XANTHONE 1 1-METHOXY-2,3-METHYLENEDIOXY-XANTHONE 1 1-O-(2,3,4-TRIHYDROXY-3-METHYL)-BUTYL-6-O-FERULOYL-BETA-D-GLUCOPYRANOSIDE 1 10-ACETOXY-8-HYDROXY-9-ISOBUTYLOXY-6-METHOXYTHYMOL 2 10-DEHYDROGINGERDIONE
    [Show full text]
  • Introduction (Pdf)
    Dictionary of Natural Products on CD-ROM This introduction screen gives access to (a) a general introduction to the scope and content of DNP on CD-ROM, followed by (b) an extensive review of the different types of natural product and the way in which they are organised and categorised in DNP. You may access the section of your choice by clicking on the appropriate line below, or you may scroll through the text forwards or backwards from any point. Introduction to the DNP database page 3 Data presentation and organisation 3 Derivatives and variants 3 Chemical names and synonyms 4 CAS Registry Numbers 6 Diagrams 7 Stereochemical conventions 7 Molecular formula and molecular weight 8 Source 9 Importance/use 9 Type of Compound 9 Physical Data 9 Hazard and toxicity information 10 Bibliographic References 11 Journal abbreviations 12 Entry under review 12 Description of Natural Product Structures 13 Aliphatic natural products 15 Semiochemicals 15 Lipids 22 Polyketides 29 Carbohydrates 35 Oxygen heterocycles 44 Simple aromatic natural products 45 Benzofuranoids 48 Benzopyranoids 49 1 Flavonoids page 51 Tannins 60 Lignans 64 Polycyclic aromatic natural products 68 Terpenoids 72 Monoterpenoids 73 Sesquiterpenoids 77 Diterpenoids 101 Sesterterpenoids 118 Triterpenoids 121 Tetraterpenoids 131 Miscellaneous terpenoids 133 Meroterpenoids 133 Steroids 135 The sterols 140 Aminoacids and peptides 148 Aminoacids 148 Peptides 150 β-Lactams 151 Glycopeptides 153 Alkaloids 154 Alkaloids derived from ornithine 154 Alkaloids derived from lysine 156 Alkaloids
    [Show full text]
  • R Graphics Output
    (+)−Gallocatechin 2 Class Hesperetin Tricin O−sinapic acid Naringenin 7−O−glucoside Anthocyanins Eriodictyol Epicatechin gallate Catechin derivatives Velutin Kumatakenin 1 Flavanone Tricin Myricetin 3−O−galactoside Quercetin Flavone Morin Kaempferol Flavone C−glycosides Quercetin 3−alpha−L−arabinofuranoside Orobol Flavonol Rosinidin O−hexoside 0 Luteolin 2'−Hydroxygenistein Flavonolignan Luteolin 8−C−hexosyl−O−hexoside Afzelechin Isoflavone Quercetin 7−O−malonylhexosyl−hexoside Dihydroquercetin Proanthocyanidins Kaempferol 3−O−robinobioside −1 Peonidin O−malonylhexoside Luteolin C−hexoside Cyanidin O−acetylhexoside Naringenin Naringenin chalcone Butin Pinocembrin Naringenin 7−O−neohesperidoside −2 Chrysin Biochanin A Myricetin Kaempferol 3−O−rutinoside 3,7−Di−O−methylquercetin Chrysoeriol O−rhamnosyl−O−glucuronic acid Procyanidin B2 Isorhamnetin O−acetyl−hexoside Chrysoeriol 5−O−hexoside Epicatechin−epiafzelechin Tricin 5−O−rutinoside Isosakuranetin−7−neohesperidoside Dihydromyricetin 8−C−hexosyl−hesperetin O−hexoside Eriodictiol 6−C−hexoside 8−C−hexoside−O−hexoside C−hexosyl−luteolin O−hexoside Naringenin C−hexoside Kaempferol 7−O−rhamnoside Chrysoeriol Quercetin O−acetylhexoside Eriodictiol C−hexosyl−O−hexoside Procyanidin A2 Hesperetin 5−O−glucoside Kaempferol 3−O−glucoside Quercetin 5−O−malonylhexosyl−hexoside Tricetin Luteolin 7−O−glucoside Eriodictyol C−hexoside 6−Hydroxydaidzein 2'−Hydroxydaidzein Kaempferin Quercetin 3−O−glucoside Fustin Selgin O−malonylhexoside C−pentosyl−C−hexosyl−apigenin Quercetin 4'−O−glucoside Gallocatechin−catechin
    [Show full text]
  • Tricin Levels and Expression of Flavonoid Biosynthetic Genes in Developing Grains of Purple and Brown Pericarp Rice
    Tricin levels and expression of flavonoid biosynthetic genes in developing grains of purple and brown pericarp rice Alexander Poulev, Joseph R. Heckman, Ilya Raskin and Faith C. Belanger Department of Plant Biology, Rutgers, The State University of New Jersey, New Brunswick, NJ, USA ABSTRACT The methylated flavone tricin has been associated with numerous health benefits, including reductions in intestinal and colon cancers in animal models. Tricin is found in a wide range of plant species and in many different tissues. However, whole cereal grains, such as rice, barley, oats, and wheat, are the only food sources of tricin, which is located in the bran portion of the grain. Variation in tricin levels was found in bran from rice genotypes with light brown, brown, red, and purple pericarp color, with the purple pericarp genotypes having the highest levels of tricin. Here, we analyzed tricin and tricin derivative levels in developing pericarp and embryo samples of a purple pericarp genotype, IAC600, that had high tricin and tricin derivative levels in the bran, and a light brown pericarp genotype, Cocodrie, that had no detectable tricin or tricin derivatives in the bran. Tricin and tricin derivatives were detected in both the pericarp and embryo of IAC600 but only in the embryo of Cocodrie. The purple pericarp rice had higher total levels of free tricin plus tricin derivatives than the light brown pericarp rice. When expressed on a per grain basis, most of the tricin component of IAC600 was in the pericarp. In contrast, Cocodrie had no detectable tricin in the pericarp samples but did have detectable chrysoeriol, a precursor of tricin, in the pericarp samples.
    [Show full text]
  • Genus Stachys: a Review of Traditional Uses, Phytochemistry and Bioactivity
    medicines Review Genus Stachys: A Review of Traditional Uses, Phytochemistry and Bioactivity Ekaterina-Michaela Tomou, Christina Barda and Helen Skaltsa * Department of Pharmacognosy and Chemistry of Natural Products, Faculty of Pharmacy, School of Health Sciences, National & Kapodistrian University of Athens, Panepistimiopolis, Zografou, 15771 Athens, Greece; [email protected] (E.-M.T.); [email protected] (C.B.) * Correspondence: [email protected]; Tel.: +30-2107274593 Received: 11 August 2020; Accepted: 25 September 2020; Published: 29 September 2020 Abstract: Background: The genus Stachys L. (Lamiaceae) includes about 300 species as annual or perennial herbs or small shrubs, spread in temperate regions of Mediterranean, Asia, America and southern Africa. Several species of this genus are extensively used in various traditional medicines. They are consumed as herbal preparations for the treatment of stress, skin inflammations, gastrointestinal disorders, asthma and genital tumors. Previous studies have investigated the chemical constituents and the biological activities of these species. Thus, the present review compiles literature data on ethnomedicine, phytochemistry, pharmacological activities, clinical studies and the toxicity of genus Stachys. Methods: Comprehensive research of previously published literature was performed for studies on the traditional uses, bioactive compounds and pharmacological properties of the genus Stachys, using databases with different key search words. Results: This surey documented 60 Stachys species and 10 subspecies for their phytochemical profiles, including 254 chemical compounds and reported 19 species and 4 subspecies for their pharmacological properties. Furthermore, 25 species and 6 subspecies were found for their traditional uses. Conclusions: The present review highlights that Stachys spp. consist an important source of bioactive phytochemicals and exemplifies the uncharted territory of this genus for new research studies.
    [Show full text]
  • Analysis of Antioxidant Activity and Flavonoids Metabolites in Peel and Flesh of Red-Fleshed Apple Varieties
    Supplementary Analysis of Antioxidant Activity and Flavonoids Metabolites in Peel and Flesh of Red-Fleshed Apple Varieties Xiang Zhang 1,2,†, Jihua Xu 1,3,†, Zhaobo Xu 4, Xiaohong Sun 1,3, Jun Zhu 1,2 and Yugang Zhang 1,2,* 1 Qingdao Key Laboratory of Genetic Development and Breeding in Horticultural Plants, Qingdao Agricultural University, Qingdao 266109, China; [email protected] (X.Z.); [email protected] (J.X.); [email protected] (X.S.); [email protected] (J.Z.) 2 College of Horticulture, Qingdao Agricultural University, Qingdao 266109, China 3 College of Life Sciences, Qingdao Agricultural University, Qingdao 266109, China 4 Qingdao Agriculture Technology Extension Center, Qingdao 266071, China; [email protected] (Z.X.) * Correspondence: [email protected]; Tel.: + 86-0532-589-57740 † These authors contributed equally to this work. Received: 17 March 2020; Accepted: 21 April 2020; Published: Figure S1. Principle component analysis (PCA) score plot, orthogonal partial least squares- discriminant analysis (OPLS-DA) score plot and permutation test in four comparison groups. (A,B) PCA in DHPM vs. XJ4PM and DHFM vs. XJ4FM. (C,D) OPLS-DA in DHPM vs. XJ4PM and DHFM vs. XJ4FM. (E,F) Permutation test in DHPM vs. XJ4PM and DHFM vs. XJ4FM. Molecules 2019, 24, x; doi: FOR PEER REVIEW www.mdpi.com/journal/molecules Molecules 2019, 24, x FOR PEER REVIEW 2 of 5 1 Table S1. The differential metabolites in both DHPM vs. XJ4PM and DHFM vs. XJ4FM. Content Fold change Combination name Metabolite name VIP Grouping of specific metabolites DH XJ4 (XJ4PM/DHPM; XJ4FM/DHFM) ANTHOCYANIN DHPM vs.
    [Show full text]
  • Reference Substances 2018/2019
    Reference Substances 2018 / 2019 Reference Substances Reference 2018/2019 Contents | 3 Contents Page Welcome 4 Our Services 5 Reference Substances 6 Index I: Alphabetical List of Reference Substances and Synonyms 156 Index II: Plant-specific Marker Compounds 176 Index III: CAS Registry Numbers 214 Index IV: Substance Classification 224 Our Reference Substance Team 234 Order Information 237 Order Form 238 Prices insert 4 | Welcome Welcome to our new 2018 / 2019 catalogue! PhytoLab proudly presents the new you will also be able to view exemplary Index I contains an alphabetical list of all 2018 / 2019 catalogue of phyproof® certificates of analysis and download substances and their synonyms. It pro- Reference Substances. The seventh edition material safety data sheets (MSDS). vides information which name of a refer- of our catalogue now contains well over ence substance is used in this catalogue 1300 phytochemicals. As part of our We very much hope that our product and guides you directly to the correct mission to be your leading supplier of portfolio meets your expectations. The list page. herbal reference substances PhytoLab of substances will be expanded even has characterized them as primary further in the future, based upon current If you are a planning to analyse a specific reference substances and will supply regulatory requirements and new scientific plant please look for the botanical them together with the comprehensive developments. The most recent information name in Index II. It will inform you about certificates of analysis you are familiar will always be available on our web site. common marker compounds for this herb. with.
    [Show full text]