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Moharram FA, El Dib RAEM, Marzouk MS, El-Shenawy SM, Ibrahim HA. New Apigenin Glycoside, Polyphenolic Constituents, Anti-inflammatory and Hepatoprotective Activities of Gaillardia grandiflora and Gaillardia pulchella Aerial Parts. Pharmacogn Mag 2017; 13:S244-S249. [PMID: 28808387 PMCID: PMC5538161 DOI: 10.4103/pm.pm_344_16] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2016] [Revised: 09/08/2016] [Indexed: 11/04/2022] Open
Abstract
BACKGROUND Gaillardia grandiflora Hort. ex Van Houte and Gaillardia pulchella Foug are flowering plants widely cultivated in Egypt for their ornamental value. Previous reports demonstrated that sesquiterpene derivatives represent the major compounds in both species. Moreover, only few flavones were identified from genus Gaillardia and few studies on the cytotoxicity of G. pulchella were found. AIM OF THE STUDY Investigation of the phenolic constituents of the aerial parts of both species and evaluation of their anti-inflammatory and hepatoprotective activities. MATERIALS AND METHODS The 80% aqueous methanol extracts (AME) were prepared for both plants and evaluated for their biological activities. Phytochemical investigation of both extracts resulted in isolation of twelve compounds, which have been identified on the basis of ultraviolet, 1D and 2D nuclear magnetic resonance spectroscopy and negative ESI-MS. RESULTS The new 8-hydroxyapigenin 6-O-β-D-apiofuranosyl-(1'''→6'')-C-β-D-4C1-glucopyranoside was isolated from G. grandiflora for the first time in nature, along with schaftoside, luteolin 6-C-β-D-4C1-glucopyranoside 8-methyl ether, apigenin 6-C-β-D-4C1-glucopyranoside 8-methyl ether, isoorientin, isovitexin, 6-methoxyluteolin and hispidulin, as well as vicenin-2, vitexin, luteolin and apigenin, which were isolated from G. pulchella together with 6-methoxyluteolin. Furthermore, the AME of both species were found to be nontoxic to mice and exhibited significant anti-inflammatory and hepatoprotective activities in dose dependent manner. CONCLUSION Current results shed light on the phenolic constituents of G. grandiflora and G. pulchella aerial parts and the safety of the AME of both species, in addition to their significant anti-inflammatory and hepatoprotective activities. Both plant species may be promising candidates for natural anti-inflammatory and hepatoprotective drugs. SUMMARY Phytochemical investigation of Gaillardia grandiflora and Gaillardia pulchella 80% aqueous methanol extracts of the aerial parts led to the isolation of twelve compoundsThe new compound 8-hydroxyapigenin 6-O-β-D-apiofuranosyl-(1''''→6'')-C-β-D-4C1-glucopyranoside was isolated from G. grandiflora for the first time in natureSchaftoside, luteolin 6-C-β-D-4C1-glucopyranoside 8-methyl ether, apigenin 6-C-β-D-4C1-glucopyranoside 8-methyl ether, isoorientin, isovitexin, 6-methoxyluteolin and hispidulin were isolated from G. grandifloraVicenin-2, vitexin, luteolin, apigenin and 6-methoxyluteolin were isolated from G. pulchellaThe extracts of both species were nontoxic to mice up to 5 g/kg body weightBoth extracts exhibited significant anti-inflammatory and hepatoprotective activities in dose dependent manner Abbreviations used: ALP: Alkaline phosphatase; ALT: Alanine aminotransferase; AME: The 80% aqueous methanol extract of G. grandiflora or G. pulchella aerial parts; AST: Aspartate aminotransferase; br d: Broad doublet; Comp-PC: Comparative paper chromatography; d: Doublet; 2D-PC: Two-dimensional paper chromatography; DMSO-d6: Deuterated dimethyl sulfoxide; G.: Gaillardia; GPx: Glutathione peroxidase; GRd: Glutathione reductase; GSH: glutathione; GST: Glutathione-S-transferase; J: Nuclear spin-spin coupling constant; m: Multiplet; [M-H]-: Molecular ion peak; MDA: Malondialdehyde; m/z: Mass/charge ratio; NO: Nitric oxide; p: Probability; PC: Paper chromatography; Rf: Retention flow; rpm: Rotation per minute; s: Singlet; SDE: The ethanol extract of Scoparia dulcis; SE: Standard error; SOD: Superoxide dismutase; TMS: Tetramethylsilane; λmax: Maximum fluorescence emission wavelength.
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Affiliation(s)
- Fatma A Moharram
- Department of Pharmacognosy, Faculty of Pharmacy, Helwan University, Cairo, Egypt
| | - Rabab Abd El Moneim El Dib
- Department of Pharmacognosy, Faculty of Pharmacy, Helwan University, Cairo, Egypt.,Department of Pharmacognosy, College of Pharmacy, King Saud University, Riyadh, Kingdom of Saudi Arabia
| | - Mohamed S Marzouk
- Department of Chemistry, College of Science and Humanities, Prince Sattam bin Abdulaziz University, 83 lkharj, Saudi Arabia.,Chemistry of Natural Products Group, Center of Excellence for Advanced Sciences, National Research Center, Egypt
| | | | - Haitham A Ibrahim
- Department of Pharmacognosy, Faculty of Pharmacy, Helwan University, Cairo, Egypt
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Analgesic and Antipyretic Activities of Methanol Extract and Its Fraction from the Root of Schoenoplectus grossus. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2016; 2016:3820704. [PMID: 26977173 PMCID: PMC4761666 DOI: 10.1155/2016/3820704] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/01/2015] [Revised: 01/04/2016] [Accepted: 01/12/2016] [Indexed: 01/31/2023]
Abstract
The study aims to evaluate analgesic and antipyretic activities of the methanol extract and its different fractions from root of Schoenoplectus grossus using acetic acid induced writhing and radiant heat tail flick method of pain models in mice and yeast induced pyrexia in rats at the doses of 400 and 200 mg/kg. In acetic acid writhing test, the methanol extract, petroleum ether, and carbon tetrachloride fractions produced significant (P < 0.001 and P < 0.05) inhibition of writhing responses in dose dependent manner. The methanol extract at 400 and 200 mg/kg being more protective with 54% and 45.45% of inhibition compared to diclofenac sodium of 56% followed by petroleum ether fractions of 49.69% and 39.39% at the same doses. The extracts did not produce any significant antinociceptive activity in tail flick test except standard morphine. When studied on yeast induced pyrexia, methanol and petroleum ether fractions significantly lowered the rectal temperature time dependently in a manner similar to standard drug paracetamol and distinctly more significant (P < 0.001) after second hour. These findings suggest that the root extracts of S. grossus possess significant peripherally acting analgesic potential and antipyretic property. The phytochemical screening showed the presence of flavonoids, alkaloids, and tannins.
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Pandurangan K, Krishnappan V, Subramanian V, Subramanyan R. Anti-inflammatory effect of certain dimethoxy flavones. Inflammopharmacology 2015; 23:307-17. [PMID: 26248971 DOI: 10.1007/s10787-015-0242-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2015] [Accepted: 06/29/2015] [Indexed: 12/01/2022]
Abstract
OBJECTIVE The aim of the present study was to evaluate the anti-inflammatory effect of four dimethoxy flavone derivatives; 7,2'-dimethoxy flavone, 7,3'-dimethoxy flavone, 7,4'-dimethoxy flavone and 7,8,-dimethoxy flavone and to investigate the possible cellular mechanisms involved. MATERIALS AND METHODS The acute anti-inflammatory effect of dimethoxy flavones was investigated by carrageenan induced hind paw oedema in rats. Further, the effect of dimethoxy flavones on certain mediators of pain and inflammation like cyclooxygenases (COX-1 and COX-2), pro-inflammatory cytokines (IL-1β and TNF-α) and free radical scavenging activity (NO and LPO) were investigated by using in vitro tests. RESULTS The investigated dimethoxy flavones produced a significant, dose and time dependent reduction of carrageenan induced paw oedema in rats with a maximum inhibition of 52.4% observed for 7,4'-dimethoxy flavone. Although, the test compounds inhibited both the isoforms of cyclooxygenase, a higher degree of inhibition on COX-2 was evident. A concentration dependent inhibition of other inflammatory cytokines like tumor necrosis factor-α and interleukin-1β was identified in the present study. 7,4'-dimethoxy flavone was found to be maximally effective in inhibiting nitrite ion free radical generation and 7,8-dimethoxy flavone was more active in inhibiting lipid peroxidation than the other compounds. CONCLUSION The results of the present study reveal the anti-inflammatory action of the investigated dimethoxy flavones. Inhibition of cyclooxygenases, cytokines and reactive oxygen species, observed in subsequent experiments may be suggested as possible mechanisms involved in the action of these compounds.
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Affiliation(s)
- Kamalakannan Pandurangan
- Department of Pharmacology, Meenakshi Medical College and Research Institute, Meenakshi Academy of Higher Education and Research, Kanchipuram, 631 552, India.
| | | | - Viswanathan Subramanian
- Department of Pharmacology, Meenakshi Medical College and Research Institute, Meenakshi Academy of Higher Education and Research, Kanchipuram, 631 552, India
| | - Ramaswamy Subramanyan
- Department of Pharmacology, Sri Lakshminarayana Institute of Medical Sciences, Pondicherry, 605 502, India
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Molecular docking, isolation and biological evaluation of Rhizophora mucronata flavonoids as anti-nociceptive agents. BIOMEDICINE & PREVENTIVE NUTRITION 2014. [DOI: 10.1016/j.bionut.2014.08.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Martino R, Canale F, Sülsen V, Alonso R, Davicino R, Mattar A, Anesini C, Micalizzi B. A Fraction Containing Kaempferol-3,4′-dimethylether from Larrea divaricata
Cav. Induces Macrophage Activation on Mice Infected with Candida albicans. Phytother Res 2013; 28:917-24. [DOI: 10.1002/ptr.5086] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2013] [Revised: 09/09/2013] [Accepted: 11/05/2013] [Indexed: 11/08/2022]
Affiliation(s)
- Renzo Martino
- Microbiology Department, Faculty of Chemistry, Biochemistry and Pharmacy; National University of San Luis; San Luis Argentina
- Department of Pharmacology, IQUIMEFA-CONICET; Buenos Aires University; Buenos Aires Argentina
| | - Fernando Canale
- Microbiology Department, Faculty of Chemistry, Biochemistry and Pharmacy; National University of San Luis; San Luis Argentina
| | - Valeria Sülsen
- Department of Pharmacology, IQUIMEFA-CONICET; Buenos Aires University; Buenos Aires Argentina
| | - Rosario Alonso
- Department of Pharmacology, IQUIMEFA-CONICET; Buenos Aires University; Buenos Aires Argentina
| | - Roberto Davicino
- Microbiology Department, Faculty of Chemistry, Biochemistry and Pharmacy; National University of San Luis; San Luis Argentina
| | - Aida Mattar
- Microbiology Department, Faculty of Chemistry, Biochemistry and Pharmacy; National University of San Luis; San Luis Argentina
| | - Claudia Anesini
- Department of Pharmacology, IQUIMEFA-CONICET; Buenos Aires University; Buenos Aires Argentina
| | - Blas Micalizzi
- Microbiology Department, Faculty of Chemistry, Biochemistry and Pharmacy; National University of San Luis; San Luis Argentina
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Pal S, Saha C. A review on structure–affinity relationship of dietary flavonoids with serum albumins. J Biomol Struct Dyn 2013; 32:1132-47. [DOI: 10.1080/07391102.2013.811700] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Kumar RS, Rajkapoor B, Perumal P. Anti-inflammatory and anti-nociceptive activities of methanolic leaf extract of Indigofera cassioides Rottl. Ex. DC. JOURNAL OF ACUTE DISEASE 2013. [DOI: 10.1016/s2221-6189(13)60152-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
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Wu X, Schauss AG. Mitigation of inflammation with foods. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2012; 60:6703-6717. [PMID: 22468569 DOI: 10.1021/jf3007008] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Constant overproduction of pro-inflammatory molecules leads to chronic inflammation. Unlike acute inflammation, which is essential for healing, chronic inflammation can delay healing and, if left unchecked, contribute to a host of diseases. There is growing evidence that some dietary factors can play important roles in maintaining health and even reversing the progression of chronic diseases, with anti-inflammatory effects as important underlying mechanism. Such findings add to the body of evidence that certain dietary components, including polyphenols and other types of compounds, found in various dietary factors including fruits, berries, vegetables, nuts, whole grains, and foods of marine origin, can play an important role in attenuating and mitigating chronic pro-inflammatory processes associated with chronic diseases.
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Affiliation(s)
- Xianli Wu
- USDA Arkansas Children's Nutrition Center , Department of Physiology and Biophysics, University of Arkansas for Medical Sciences, 15 Children's Way, Little Rock, Arkansas 72202, United States
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Mandegary A, Pournamdari M, Sharififar F, Pournourmohammadi S, Fardiar R, Shooli S. Alkaloid and flavonoid rich fractions of fenugreek seeds (Trigonella foenum-graecum L.) with antinociceptive and anti-inflammatory effects. Food Chem Toxicol 2012; 50:2503-7. [DOI: 10.1016/j.fct.2012.04.020] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2011] [Revised: 04/02/2012] [Accepted: 04/11/2012] [Indexed: 12/01/2022]
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Tahanian E, Sanchez LA, Shiao TC, Roy R, Annabi B. Flavonoids targeting of IκB phosphorylation abrogates carcinogen-induced MMP-9 and COX-2 expression in human brain endothelial cells. DRUG DESIGN DEVELOPMENT AND THERAPY 2011; 5:299-309. [PMID: 21625419 PMCID: PMC3100225 DOI: 10.2147/dddt.s19931] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/12/2011] [Indexed: 12/11/2022]
Abstract
Brain endothelial cells play an essential role as structural and functional components of the blood–brain barrier (BBB). Increased BBB breakdown and brain injury are associated with neuroinflammation and are thought to trigger mechanisms involving matrix metalloproteinase upregulation. Emerging evidence also indicates that cyclooxygenase (COX) inhibition limits BBB disruption, but the mechanisms linking metalloproteinase to COX remain unknown. In this study, we sought to investigate the nuclear factor-kappa B (NF-κB) signaling pathway, a common pathway in both the regulation of matrix metalloproteinase-9 (MMP-9) and COX-2 expression, and the inhibitory properties of several chemopreventive flavonoids. Human brain microvascular endothelial cells were treated with a combination of phorbol 12-myristate 13-acetate (PMA), a carcinogen documented to increase MMP-9 and COX-2 through NF-κB, and several naturally occurring flavonoids. Among the molecules tested, we found that fisetin, apigenin, and luteolin specifically and dose-dependently antagonized PMA-induced COX-2 and MMP-9 gene and protein expressions as assessed by qRT-PCR, immunoblotting, and zymography respectively. We further demonstrate that flavonoids impact on IκK-mediated phosphorylation activity as demonstrated by the inhibition of PMA-induced IκB phosphorylation levels. Our results suggest that BBB disruption during neuroinflammation could be pharmacologically reduced by a specific class of flavonoids acting as NF-κB signal transduction inhibitors.
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Affiliation(s)
- Elizabeth Tahanian
- Centre de Recherche BioMED, Département de chimie, Université du Québec à Montréal, QC, Canada
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Jothimaniv C, Kumar R, Subramania N. Anti-Inflammatory and Analgesic Activities of Ethanol Extract of Aerial Parts of Justicia gendarussa Burm. INT J PHARMACOL 2010. [DOI: 10.3923/ijp.2010.278.283] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Banerjee T, Van der Vliet A, Ziboh VA. Downregulation of COX-2 and iNOS by amentoflavone and quercetin in A549 human lung adenocarcinoma cell line. Prostaglandins Leukot Essent Fatty Acids 2002; 66:485-92. [PMID: 12144868 DOI: 10.1054/plef.2002.0387] [Citation(s) in RCA: 78] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Flavonoids are natural polyphenolic compounds ubiquitously present in the plant kingdom. They are reported to exhibit numerous beneficial health effects. In the present study, we demonstrate the potential effects of different flavonoids on cytokines mediated cyclooxygenase-2 and inducible nitric oxide synthase expression and activities in A549 cell line using quercetin, amentoflavone and flavanone. Our data revealed that quercetin, at 50 micro M concentration inhibited PGE(2) biosynthesis by A549 very strongly with little effect on COX-2 mRNA and protein expression. Unlike quercetin, amentoflavone inhibited both PGE(2) biosynthesis and COX-2 mRNA and protein expression strongly. In another set of experiment, quercetin inhibited iNOS protein expression completely without affecting iNOS mRNA expression. In contrast, amentoflavone although exerted no inhibitory effect on iNOS mRNA expression, did inhibit weakly iNOS protein expression. Flavanone had no inhibitory effect on either enzyme at the same concentration. Taken together, our data indicated that amentoflavone and quercetin differentially exerted supression of PGE(2) biosynthesis via downregulation of COX-2/iNOS expression.
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Affiliation(s)
- T Banerjee
- Center For Comparative Lung Cell Biology and Medicine, School of Medicine, Division of Pulmonary Critical Care Medicine, University of California, Davis, CA 95616, USA
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Nijveldt RJ, van Nood E, van Hoorn DE, Boelens PG, van Norren K, van Leeuwen PA. Flavonoids: a review of probable mechanisms of action and potential applications. Am J Clin Nutr 2001; 74:418-25. [PMID: 11566638 DOI: 10.1093/ajcn/74.4.418] [Citation(s) in RCA: 1600] [Impact Index Per Article: 69.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The aim of this review, a summary of the putative biological actions of flavonoids, was to obtain a further understanding of the reported beneficial health effects of these substances. Flavonoids occur naturally in fruit, vegetables, and beverages such as tea and wine. Research in the field of flavonoids has increased since the discovery of the French paradox,ie, the low cardiovascular mortality rate observed in Mediterranean populations in association with red wine consumption and a high saturated fat intake. Several other potential beneficial properties of flavonoids have since been ascertained. We review the different groups of known flavonoids, the probable mechanisms by which they act, and the potential clinical applications of these fascinating natural substances.
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Affiliation(s)
- R J Nijveldt
- Department of Surgery, Vrije Universiteit Medical Center, Amsterdam, Netherlands
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Mizugaki M, Ishizawa F, Yamazaki T, Hishinuma T. Epigallocatechin gallate increase the prostacyclin production of bovine aortic endothelial cells. Prostaglandins Other Lipid Mediat 2000; 62:157-64. [PMID: 10938409 DOI: 10.1016/s0090-6980(00)00060-5] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
We describe the effect of (-) epigallocatechin gallate (EGCg), one of catechins known in tea, on the prostacyclin (PGI) production by bovine aortic endothelial cells. The amounts of 6-keto-PGF(1alpha) and Delta(17)-6-keto-PGF(1alpha), stable metabolites of PGI(2) and PGI(3), released in culture medium were measured using gas chromatography/selected ion monitoring (GC/SIM). The prostacyclin production of endothelial cells was increased by EGCg in a dose- and time-dependent manner. The effect by EGCg was stronger than any other catechins (catechin, epicatechin, epigallocatechin, and epicatechin gallate). When endothelial cells incubated with EGCg and arachidonic acid (AA) or eicosapentaenoic acid (EPA), PGI(2), and PGI(3) production were increased greater than those incubated with AA or EPA alone. Furthermore, gallic acid, that also has a pyrogallol structure, increased PGI(2) production. These observations indicate that catechins increase the prostacyclin production and that the pyrogallol structure is significant to this function.
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Affiliation(s)
- M Mizugaki
- Department of Pharmaceutical Sciences, Tohoku University Hospital, 1-1, Seiryo-machi, Aoba-ku, 980-8574, Sendai, Japan.
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Zenda N, Okubo S, Hu ZQ, Hara Y, Shimamura T. Erythrocyte-dependent mitogenic activity of epigallocatechin gallate on mouse splenic B cells. INTERNATIONAL JOURNAL OF IMMUNOPHARMACOLOGY 1997; 19:399-403. [PMID: 9568544 DOI: 10.1016/s0192-0561(97)00074-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
We previously reported that epigallocatechin gallate (EGCg), the main constituent of tea catechins, displays mitogenic effect on mouse splenic B cells. During research into the mechanism(s), it was found that the mitogenic activity of EGCg was dependent on the presence of red blood cells (RBC). When RBC in T cell-depleted spleen cells were removed, EGCg did not enhance the proliferation of B cells and even showed toxic effect at 25-50 micrograms/ml. When mouse, rabbit or sheep RBC as well as RBC-ghosts were added into the cultures, EGCg showed the mitogenic activity at a range of 1-50 micrograms/ml. Thereafter, we preincubated RBC with EGCg at 4 degrees C for various times and then washed the RBC to remove free EGCg in the suspensions. The EGCg-preincubated RBC also enhanced B cell proliferation. As short as ten minutes was sufficient for EGCg to bind to RBC membrane. These results indicate that EGCg first attached to the membrane of RBC and then stimulated B cell proliferation. The above results suggest an important immunoregulatory function of RBC.
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Affiliation(s)
- N Zenda
- Department of Microbiology and Immunology, Showa University School of Medicine, Tokyo, Japan
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Hu ZQ, Toda M, Okubo S, Hara Y, Shimamura T. Mitogenic activity of (-)epigallocatechin gallate on B-cells and investigation of its structure-function relationship. INTERNATIONAL JOURNAL OF IMMUNOPHARMACOLOGY 1992; 14:1399-407. [PMID: 1464471 DOI: 10.1016/0192-0561(92)90011-9] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
(-)Epigallocatechin gallate (EGCg), the main constituent of green tea, strongly enhanced the direct plaque-forming cell (PFC) response to sheep red blood cells (SRBC) in vitro and showed strong mitogenic activity for mouse splenic B-cells but not for splenic T-cells and thymocytes. The enhancement of B-cell proliferation was not mediated by macrophages since their removal did not eliminate the activity. Among the derivatives of catechin examined, (+)catechin (C); (-)epicatechin (EC); (-)-epigallocatechin (EGC); (-)epicatechin gallate (ECg); (-)epigallocatechin gallate (EGCg); and theaflavin digallate (TF3), only the derivatives with the galloyl group (ECg, EGCg, and TF3) displayed significant enhancement of the spontaneous proliferation of B-cells. Structural analogs of the catechin and galloyl groups were also examined in the system. Gallic acid and tannic acid induced some enhancement, but rutin, pyrogallol and caffeine did not. The results indicate that the galloyl group on EGCg was responsible for enhancement. However, the basic conformations of the catechins are also important, because ECg, EGCg, TF3, gallic acid, and tannic acid had quite different potencies to induce B-cell proliferation.
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Affiliation(s)
- Z Q Hu
- Department of Microbiology and Immunology, Showa University School of Medicine, Tokyo, Japan
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