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Syafni N, Devi S, Zimmermann-Klemd AM, Reinhardt JK, Danton O, Gründemann C, Hamburger M. Immunosuppressant flavonoids from Scutellaria baicalensis. Biomed Pharmacother 2021; 144:112326. [PMID: 34653757 DOI: 10.1016/j.biopha.2021.112326] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Revised: 10/06/2021] [Accepted: 10/08/2021] [Indexed: 10/20/2022] Open
Abstract
Some plants used in Traditional Chinese Medicine serve as treatment for disease states where a suppression of the cellular immune response is desired. However, the compounds responsible for the immunosuppressant effects of these plants are not necessarily known. The immunosuppressant compounds in the roots of Scutellaria baicalensis, one of the most promising plants identified in a previous screening, were tracked by HPLC activity profiling and concomitant on-line spectroscopic analysis. Compounds were then isolated by preparative chromatography, and structures elucidated by spectroscopic methods. Twelve flavonoids (5-16) were identified from the active time windows, and structurally related flavones 2, 4, and 17, and flavanones 1 and 3 were isolated from adjacent fractions. All flavonoids possessed an unusual substitution pattern on the B-ring, with an absence of substituents at C-3 and C-4. Compounds 11, 13, 14, and 16 inhibited T-cell proliferation (IC50 values at 12.1-39 μM) at non-cytotoxic concentrations. The findings may support the use of S. baicalensis in disorders where a modulation of the cellular immune response is desirable.
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Affiliation(s)
- Nova Syafni
- Pharmaceutical Biology, Department of Pharmaceutical Sciences, University of Basel, Basel, Switzerland; Faculty of Pharmacy and Sumatran Biota Laboratory, University of Andalas, Padang, West Sumatra, Indonesia.
| | - Seema Devi
- Center for Complementary Medicine, Institute for Infection Prevention and Hospital Epidemiology, Faculty of Medicine, University of Freiburg, Freiburg, Germany.
| | - Amy M Zimmermann-Klemd
- Center for Complementary Medicine, Institute for Infection Prevention and Hospital Epidemiology, Faculty of Medicine, University of Freiburg, Freiburg, Germany.
| | - Jakob K Reinhardt
- Pharmaceutical Biology, Department of Pharmaceutical Sciences, University of Basel, Basel, Switzerland.
| | - Ombeline Danton
- Pharmaceutical Biology, Department of Pharmaceutical Sciences, University of Basel, Basel, Switzerland.
| | - Carsten Gründemann
- Translational Complementary Medicine, Department of Pharmaceutical Sciences, University of Basel, Basel, Switzerland.
| | - Matthias Hamburger
- Pharmaceutical Biology, Department of Pharmaceutical Sciences, University of Basel, Basel, Switzerland.
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Elkin YN, Kulesh NI, Stepanova AY, Solovieva AI, Kargin VM, Manyakhin AY. Methylated flavones of the hairy root culture Scutellaria baicalensis. JOURNAL OF PLANT PHYSIOLOGY 2018; 231:277-280. [PMID: 30340124 DOI: 10.1016/j.jplph.2018.10.009] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2018] [Revised: 10/08/2018] [Accepted: 10/08/2018] [Indexed: 06/08/2023]
Abstract
Perennial plants in northern Dauria (Zabaikalsky region) grow in low temperatures in winter and in a dry hot summer. The prairies of northern Dauria are rich in a variety of medicinal herbs, including S. baicalensis, which has roots that are in demand for traditional Chinese medicine. In addition to two monomethylated flavones (wogonin and oroxylin A), determining the pharmacological significance of the root, there is also a minority of their polymethylated congeners. Little is known about their role in the plant or their connection with the conditions of growth and cultivation of their hairy root culture (HRC). Therefore, the purpose of this study was to determine whether and to what extent the biosynthesis of the latter is retained in the hairy root culture established from wild plants of Dauria. The composition of the main methylated flavones of HRC was established using LC-MS and a previously unknown pentamethylated flavone was found in the roots. This study showed a more significant accumulation of polymethylated flavones in the root of the wild plant than in HRC.
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Affiliation(s)
- Y N Elkin
- Pacific Institute Bioorganic Chemistry FEB RAS, 690022, 159 Stoletiya ave., Vladivostok, Russia.
| | - N I Kulesh
- Pacific Institute Bioorganic Chemistry FEB RAS, 690022, 159 Stoletiya ave., Vladivostok, Russia
| | - A Y Stepanova
- Institute of Plant Physiology RAS, 127276, 35 Botanicheskaya st., Moscow, Russia
| | - A I Solovieva
- Institute of Plant Physiology RAS, 127276, 35 Botanicheskaya st., Moscow, Russia
| | - V M Kargin
- Dauria Stock Company, 687510, 14 Spokoininskaja st., Orlovsky, Zabaikalsky region, Russia
| | - A Y Manyakhin
- Federal Scientific Center of the East Asia Terrestrial Biodiversity FEB RAS, 690022, 159 Stoletiya ave., Vladivostok, Russia; Vladivostok State University of Economics and Service, 690002, 41 Gogol st., Vladivostok, Russia
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Jung MA, Jang SE, Hong SW, Hana MJ, Kim DH. The role of intestinal microflora in anti-inflammatory effect of baicalin in mice. Biomol Ther (Seoul) 2013; 20:36-42. [PMID: 24116272 PMCID: PMC3792199 DOI: 10.4062/biomolther.2012.20.1.036] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2011] [Revised: 10/13/2011] [Accepted: 11/02/2011] [Indexed: 12/22/2022] Open
Abstract
Baicalin, a main constituent of the rhizome of Scutellaria baicalensis, is metabolized to baicalein and oroxylin A in the intestine before its absorption. To understand the role of intestinal microflora in the pharmacological activities of baicalin, we investigated its anti-inflammatory effect in mice treated with and without antibiotics. Orally administered baicalin showed the anti-inflammatory effect in mice than intraperitoneally treated one, apart from intraperitoneally administered its metabolites, baicalein and oroxylin A, which potently inhibited LPS-induced inflammation. Of these metabolites, oroxylin A showed more potent anti-inflammatory effect. However, treatment with the mixture of cefadroxil, oxytetracycline and erythromycin (COE) significantly attenuated the anti-inflammatory effect of orally administered baicalin in mice. Treatment with COE also reduced intestinal bacterial fecal β-glucuronidase activity. The metabolic activity of human stools is significantly different between individuals, but neither between ages nor between male and female. Baicalin was metabolized to baicalein and oroxylin A, with metabolic activities of 1.427 ± 0.818 and 1.025 ± 0.603 pmol/min/mg wet weight, respectively. Baicalin and its metabolites also inhibited the expression of pro-inflammatory cytokines, TNF-α and IL-1β, and the activation of NF-κB in LPS-stimulated peritoneal macrophages. Of them, oroxylin A showed the most potent inhibition. Based on these findings, baicalin may be metabolized to baicalein and oroxylin A by intestinal microflora, which enhance its anti-inflammatory effect by inhibiting NF-κB activation.
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Lin YL, Ou JC, Chen CF, Kuo YH. Flavonoids from the Roots ofScutellaria LuzonicaRolfe. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.199100101] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Olennikov DN, Chirikova NK, Tankhaeva LM. Phenolic compounds of Scutellaria baicalensis Georgi. RUSSIAN JOURNAL OF BIOORGANIC CHEMISTRY 2010. [DOI: 10.1134/s1068162010070046] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Anti-pruritic effect of baicalin and its metabolites, baicalein and oroxylin A, in mice. Acta Pharmacol Sin 2010; 31:718-24. [PMID: 20453872 DOI: 10.1038/aps.2010.42] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
AIM To explore whether intestinal microflora plays a role in anti-pruritic activity of baicalin, a main constituent of the rhizome of Scutellaria baicalensis (SB). METHODS Baicalin was anaerobically incubated with human fecal microflora, and its metabolites, baicalein and oroxylin A, were isolated. The inhibitory effect of baicalin and its metabolites was accessed in histamine- or compound 48/80-induced scratching behavior in mice. RESULTS Baicalin was metabolized to baicalein and oroxylin A, with metabolic activities of 40.2+/-26.2 and 1.2+/-1.1 nmol.h(-1).mg(-1) wet weight of human fecal microflora, respectively. Baicalin (20, 50 mg/kg) showed more potent inhibitory effect on histamine-induced scratching behavior when orally administered than intraperitoneally. In contrast, baicalein and oroxylin A had more potent inhibitory effect when the intraperitoneally administered. The anti-scratching behavior activity of oral baicalin and its metabolites was in proportion to their inhibition on histamine-induced increase of vascular permeability with oroxylin A more potent than baicalein and baicalin. In Magnus test using guinea pig ileum, oroxylin A is more potent than baicalein and baicalin in inhibition of histamine-induced contraction. The anti-scratching behavioral effect of oral baicalin was significantly reduced when oral antibiotics were simultaneously administered, whereas the effect of baicalein and oroxylin A were not affected. CONCLUSION Oral baicalin may be metabolized by intestinal microflora into baicalein and oroxylin A, which ameliorate pruritic reactions through anti-histamine action.
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Han SJ, Ryu SN, Trinh HT, Joh EH, Jang SY, Han M, Kim DH. Metabolism of Cyanidin-3-O-β-D-Glucoside Isolated from Black Colored Rice and Its Antiscratching Behavioral Effect in Mice. J Food Sci 2009; 74:H253-8. [DOI: 10.1111/j.1750-3841.2009.01327.x] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Li J, Ding Y, Li XC, Ferreira D, Khan S, Smillie T, Khan IA. Scuteflorins A and B, dihydropyranocoumarins from Scutellaria lateriflora. JOURNAL OF NATURAL PRODUCTS 2009; 72:983-987. [PMID: 19555121 DOI: 10.1021/np900068t] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Two new dihydropyranocoumarins, scuteflorins A (1) and B (2), together with the known compounds decursin (3), chrysin (4), oroxylin A (5), wogonin (6), 5,7-dihydroxy-8,2'-dimethoxyflavone, dihydrochrysin, dihydrooroxylin A, lupenol, scutellaric acid, pomolic acid, ursolic acid, beta-sitosterol, daucosterol, and palmitic acid, were isolated from the aerial parts of Scutellaria lateriflora, commonly used as a dietary supplement. The structures of 1 and 2 were established by means of 1D and 2D NMR spectra as well as HRMS data. The absolute configuration of coumarins 1 and 2 was determined by comparison of experimental and theoretical calculated CD spectra. The cytotoxicity and antioxidant effects of the methanol extract of this plant and some of the constituent flavonoids were evaluated in vitro.
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Affiliation(s)
- Jing Li
- Department of Pharmacognosy, School of Pharmacy, The University of Mississippi, University, Mississippi 38677, USA
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Hong SH, Yi JM, Kim H, Choi HY, Kim YK, Chae HJ, Kim HR, Kim CH, Kim HM. Inhibitory effects of Okbyungpoong-Gamhmi on anaphylactic responses. JOURNAL OF ETHNOPHARMACOLOGY 2005; 98:361-365. [PMID: 15814273 DOI: 10.1016/j.jep.2005.02.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2005] [Revised: 02/04/2005] [Accepted: 02/04/2005] [Indexed: 05/24/2023]
Abstract
We investigated the effect of a herbal formulation Okbyungpoong-Gamhmi (OG) on mast cell-dependent anaphylactic reactions by intra-rectal administration. OG concentration dependently inhibited compound 48/80-induced anaphylaxis-like response and ear swelling response with doses of 0.01-1g/kg. OG also inhibited the passive cutaneous anaphylaxis at the same concentrations. The histamine release induced by compound 48/80 or IgE from the rat peritoneal mast cells was reduced by 64.2 and 63.6%, respectively, at 1g/l. These results provide evidence that intra-rectal therapy of OG may be beneficial in the treatment of anaphylactic response.
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Affiliation(s)
- Seung-Heon Hong
- Department of Oriental Pharmacy, College of Pharmacy, Wonkwang University, Iksan, Jeonbuk 570-749, Republic of Korea
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Ohtake N, Nakai Y, Yamamoto M, Sakakibara I, Takeda S, Amagaya S, Aburada M. Separation and isolation methods for analysis of the active principles of Sho-saiko-to (SST) oriental medicine. J Chromatogr B Analyt Technol Biomed Life Sci 2005. [PMID: 15556493 DOI: 10.1016/s1570-0232(04)00547-1] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Sho-saiko-to (SST) was introduced into Japan as an oriental classical medicine from China approximately 1500 years ago, and it is currently the most representative Kampo medicine (traditional Japanese medicine). SST is manufactured in Japan as an ethical drug on a modern industrial scale in which the quality of ingredients is standardized with Good Manufacturing Practices (GMP) regulation. SST is widely used for the treatment of chronic hepatitis. Experimental and clinical studies including multi-center, placebo-controlled, double-blind studies have demonstrated the various pharmacological effects of SST. SST is prepared from the hot water extraction of seven raw materials, therefore many kinds of constituents are included. Three-dimensional (3D) HPLC analysis is useful for obtaining many kinds of constituents, especially low molecular ultraviolet (UV) quenching compounds, contained in SST as well as its fractions. Fingerprint pattern provided by 3D HPLC analysis makes possible to identify the overall-viewing of SST. Databases of UV spectra of the components of medicinal herbs obtained by reversed-phase (RP) HPLC using a photodiode array (PDA) and fingerprint patterns of crude drugs made by 3D HPLC analysis facilitate the identification, analysis and quality of herbal drugs. Studies using both PDA HPLC and an amino acid analysis with a fluorometric detector have found that SST contains fifteen major low molecular compounds (i.e. baicalin, wogonin-7-O-glucuronide, liquiritin, their three aglycons, liquiritin apioside, glycyrrhizin, saikosaponin b1, saikosaponin b2, ginsenoside Rg1, ginsenoside Rb1, (6)-gingerol, (6)-shogaol and arginine). These compounds have various pharmacological actions, and are assumed to be responsible, at least partly, for the pharmacological effects of SST. Although there have only been a few investigations on high molecular compounds with pharmacological actions contained in SST, several kinds of polysaccharides have been isolated from constituent herbs of SST. This review paper summarizes analytical methods of separation, isolation and identification of compounds with biological activities from SST, which is a mixture drug of medicinal herbs. Accordingly, this paper would not focus on methods of separation, isolation and analysis of particular compounds from each constituent herb of SST.
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Affiliation(s)
- Nobuhiro Ohtake
- Medicinal Evaluation Laboratories, Tsumura Research Institute, Tsumura & Co., 3586 Yoshiwara, Ami-machi, Inashiki-gun, Ibaraki 300-1192, Japan.
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Ohtake N, Nakai Y, Yamamoto M, Sakakibara I, Takeda S, Amagaya S, Aburada M. Separation and isolation methods for analysis of the active principles of Sho-saiko-to (SST) oriental medicine. J Chromatogr B Analyt Technol Biomed Life Sci 2004; 812:135-48. [PMID: 15556493 PMCID: PMC7105231 DOI: 10.1016/j.jchromb.2004.06.051] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2004] [Accepted: 06/29/2004] [Indexed: 12/16/2022]
Abstract
Sho-saiko-to (SST) was introduced into Japan as an oriental classical medicine from China approximately 1500 years ago, and it is currently the most representative Kampo medicine (traditional Japanese medicine). SST is manufactured in Japan as an ethical drug on a modern industrial scale in which the quality of ingredients is standardized with Good Manufacturing Practices (GMP) regulation. SST is widely used for the treatment of chronic hepatitis. Experimental and clinical studies including multi-center, placebo-controlled, double-blind studies have demonstrated the various pharmacological effects of SST. SST is prepared from the hot water extraction of seven raw materials, therefore many kinds of constituents are included. Three-dimensional (3D) HPLC analysis is useful for obtaining many kinds of constituents, especially low molecular ultraviolet (UV) quenching compounds, contained in SST as well as its fractions. Fingerprint pattern provided by 3D HPLC analysis makes possible to identify the overall-viewing of SST. Databases of UV spectra of the components of medicinal herbs obtained by reversed-phase (RP) HPLC using a photodiode array (PDA) and fingerprint patterns of crude drugs made by 3D HPLC analysis facilitate the identification, analysis and quality of herbal drugs. Studies using both PDA HPLC and an amino acid analysis with a fluorometric detector have found that SST contains fifteen major low molecular compounds (i.e. baicalin, wogonin-7-O-glucuronide, liquiritin, their three aglycons, liquiritin apioside, glycyrrhizin, saikosaponin b1, saikosaponin b2, ginsenoside Rg1, ginsenoside Rb1, (6)-gingerol, (6)-shogaol and arginine). These compounds have various pharmacological actions, and are assumed to be responsible, at least partly, for the pharmacological effects of SST. Although there have only been a few investigations on high molecular compounds with pharmacological actions contained in SST, several kinds of polysaccharides have been isolated from constituent herbs of SST. This review paper summarizes analytical methods of separation, isolation and identification of compounds with biological activities from SST, which is a mixture drug of medicinal herbs. Accordingly, this paper would not focus on methods of separation, isolation and analysis of particular compounds from each constituent herb of SST.
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Affiliation(s)
- Nobuhiro Ohtake
- Medicinal Evaluation Laboratories, Tsumura Research Institute, Tsumura & Co., 3586 Yoshiwara, Ami-machi, Inashiki-gun, Ibaraki 300-1192, Japan.
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Ishimaru K, Nishikawa K, Omoto T, Asai I, Yoshihira K, Shimomura K. Two flavone 2'-glucosides from Scutellaria baicalensis. PHYTOCHEMISTRY 1995; 40:279-281. [PMID: 7546551 DOI: 10.1016/0031-9422(95)00200-q] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Two new flavone glucosides, 5,2',6'-trihydroxy-6,7,8-trimethoxyflavone 2'-O-glucoside and 5,2',6'-trihydroxy-6,7-dimethoxyflavone 2'-O-glucoside were isolated from the aqueous methanol extract of the roots of Scutellaria baicalensis. From the extract, seven phenolics, 5,7,2',6'-terahydroxyflavone, 5,7,2',5'-tetrahydroxy-8,6'-dimethoxyflavone, skullcapflavone II, baicalin, baicalin methyl ester, wogonin 7-glucuronide and 3,5,7,2',6'-pentahydroxyflavanone were also isolated.
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Affiliation(s)
- K Ishimaru
- Department of Applied Biological Sciences, Faculty of Agriculture, Saga University, Japan
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Liu YM, Sheu SJ. Capillary electrophoresis determination of baicalein, baicalin, wogonin and wogonin-7-O-glucuronide in traditional Chinese medicinal preparations. ACTA ACUST UNITED AC 1994. [DOI: 10.1002/jhrc.1240170713] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Liu YM, Sheu SJ. Determination of the six major flavonoids in Scutellariae Radix by micellar electrokinetic capillary electrophoresis. Anal Chim Acta 1994. [DOI: 10.1016/0003-2670(94)80134-7] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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Chemesova II, Budantsev AL. Flavonoid fromScutellaria adsurgens. Chem Nat Compd 1994. [DOI: 10.1007/bf00630019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Antineoplastic natural products and the analogues V. Antitumor activity of skullcapflavon II. Arch Pharm Res 1985. [DOI: 10.1007/bf02856499] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Nagao M, Morita N, Yahagi T, Shimizu M, Kuroyanagi M, Fukuoka M, Yoshihira K, Natori S, Fujino T, Sugimura T. Mutagenicities of 61 flavonoids and 11 related compounds. ENVIRONMENTAL MUTAGENESIS 1981; 3:401-19. [PMID: 7021146 DOI: 10.1002/em.2860030402] [Citation(s) in RCA: 172] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
The mutagenicities of 61 flavonoids (naturally occurring flavonoid aglycones and flavonal glycosides and synthetic flavonoids) and those of 11 compounds structurally related to flavonoids were tested with Salmonella typhimurium strains TA100 and TA98. Among the 22 flavone derivatives tested, only wogonin was strongly mutagenic, while five derivatives, apigenin triacetate, acacetin, chrysoeriol, pedalitin, and pedalitin tetraacetate, were only weakly mutagenic. Two bisflavonyl derivatives, neither of which has a 3-hydroxyl group, were not mutagenic. Of the 16 flavonol derivatives tested, all except 3-hydroxyflavone and the tetra- and penta-methyl ethers of quercetin were mutagenic. Of the five flavanone derivatives tested, only 7,4-dihydroxyflavanone was mutagenic, showing weak activity. Of the four flavanolol derivatives tested, hydrorobinetin and taxifolin were weakly mutagenic. Of the six isoflavone derivatives tested, tectorigenin was weakly mutagenic. Of the 11 compounds in the miscellaneous group structurally related to flavonoids, only isoliquiritigenin was mutagenic, showing weak activity. For the emergence of strong mutagenicity, the double bond between positions 2 and 3 and the hydroxyl group at position 3 are required, except in wogonin, which does not have a hydroxyl group at position 3 but is strongly mutagenic to TA100. The 3-O-acetyl ester of flavonol, quercetin, was mutagenic with S9 mix, but 3-O-methyl ethers were not. Six flavonol glycosides, three quercetin glycosides and three kaempferol glycosides were mutagenic after preincubation with "hesperidinase," a crude extract of Aspergillus niger. Of 66 flavonoid agylcones and compounds structurally related to flavonoids, quercetin was the strongest mutagen. The carcinogenicity of this compound should be clarified because it is ubiquitously found in vegetables.
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Horie T, Tsukayama M, Masumura M, Nakayama M, Hayashi S. The Synthesis of 5,2′-Dihydroxy-6,8-dimethoxyflavone and Its Isomers: A Revised Structure of Skullcapflavone I. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1979. [DOI: 10.1246/bcsj.52.2950] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Joshi BS, Gawad DH. Flavones ofPajanelia multijuga P.DC. andLigustrum neilgherense var. obovata C.B.Cl. ACTA ACUST UNITED AC 1977. [DOI: 10.1007/bf03046650] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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