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Prenylated Flavonoids in Topical Infections and Wound Healing. Molecules 2022; 27:molecules27144491. [PMID: 35889363 PMCID: PMC9323352 DOI: 10.3390/molecules27144491] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2022] [Revised: 07/08/2022] [Accepted: 07/09/2022] [Indexed: 11/16/2022] Open
Abstract
The review presents prenylated flavonoids as potential therapeutic agents for the treatment of topical skin infections and wounds, as they can restore the balance in the wound microenvironment. A thorough two-stage search of scientific papers published between 2000 and 2022 was conducted, with independent assessment of results by two reviewers. The main criteria were an MIC (minimum inhibitory concentration) of up to 32 µg/mL, a microdilution/macrodilution broth method according to CLSI (Clinical and Laboratory Standards Institute) or EUCAST (European Committee on Antimicrobial Susceptibility Testing), pathogens responsible for skin infections, and additional antioxidant, anti-inflammatory, and low cytotoxic effects. A total of 127 structurally diverse flavonoids showed promising antimicrobial activity against pathogens affecting wound healing, predominantly Staphylococcus aureus strains, but only artocarpin, diplacone, isobavachalcone, licochalcone A, sophoraflavanone G, and xanthohumol showed multiple activity, including antimicrobial, antioxidant, and anti-inflammatory along with low cytotoxicity important for wound healing. Although prenylated flavonoids appear to be promising in wound therapy of humans, and also animals, their activity was measured only in vitro and in vivo. Future studies are, therefore, needed to establish rational dosing according to MIC and MBC (minimum bactericidal concentration) values, test potential toxicity to human cells, measure healing kinetics, and consider formulation in smart drug release systems and/or delivery technologies to increase their bioavailability.
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Liang M, Ge X, Xua H, Ma K, Zhang W, Zan Y, Efferth T, Xue Z, Hua X. Phytochemicals with activity against methicillin-resistant Staphylococcus aureus. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2022; 100:154073. [PMID: 35397285 DOI: 10.1016/j.phymed.2022.154073] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2021] [Revised: 03/21/2022] [Accepted: 03/25/2022] [Indexed: 06/14/2023]
Abstract
BACKGROUND The evolution of resistance to antimicrobials is a ubiquitous phenomenon. The evolution of antibiotic resistance in Staphylococcus aureus suggests that there is no remedy with sustaining effectiveness against this pathogen. The limited number of antibacterial drug classes and the common occurrence of cross-resistant bacteria reinforce the urgent need to discover new compounds targeting novel cellular functions. Natural products are a potential source of novel antibacterial agents. Anti-MRSA (methicillin-resistant S. aureus) bioactive compounds from Streptomyces and the anti-MRSA activity of a series of plant extracts have been reviewed respectively. However, there has been no detailed review of the precise bioactive components from plants. PURPOSE The present review aimed to summarize the phytochemicals that have been reported with anti-MRSA activities, analyze their structure-activity relationship and novel anti-MRSA mechanisms. METHODS Data contained in this review article are compiled from the authoritative databases PubMed, Web of Science, Google Scholar, and so on. RESULTS This review summarizes 100 phytochemicals (27 flavonoids, 23 alkaloids, 17 terpenes and 33 others) that have been tested for their anti-MRSA activity. Among these phytochemicals, 39 compounds showed remarkable anti-MRSA activity with MIC values less than 10 μg/ml, 14 compounds with MIC ranges including values < 10 μg/ml, 5 compounds with MIC values less than 5 μM; 11 phytochemicals show synergism anti-MRSA effects in combination with antibiotics. Phytochemicals exerted anti-MRSA activities mainly by destroying the membrane structure and inhibiting the efflux pump. CONCLUSIONS The 58 compounds with excellent anti-MRSA activity the 11 compounds with synergistic anti-MRSA effect, especially cannabinoids, xanthones and fatty acids should be further studied in vitro. Novel targets, such as cell membrane and efflux pump could be promising alternatives to develop antibacterial drugs in the future in order to prevent drug resistance.
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Affiliation(s)
- Miaomiao Liang
- Key Laboratory of Saline-alkali Vegetation Ecology Restoration (Northeast Forestry University), Ministry of Education, Harbin, China
| | - Xueliang Ge
- Department of Cell and Molecular Biology, Biomedical Center, Uppsala University, Uppsala SE-75124, Sweden
| | - Hui Xua
- Key Laboratory of Saline-alkali Vegetation Ecology Restoration (Northeast Forestry University), Ministry of Education, Harbin, China
| | - Kaifeng Ma
- Key Laboratory of Saline-alkali Vegetation Ecology Restoration (Northeast Forestry University), Ministry of Education, Harbin, China
| | - Wei Zhang
- Key Laboratory of Saline-alkali Vegetation Ecology Restoration (Northeast Forestry University), Ministry of Education, Harbin, China
| | - Yibo Zan
- Key Laboratory of Saline-alkali Vegetation Ecology Restoration (Northeast Forestry University), Ministry of Education, Harbin, China
| | - Thomas Efferth
- Department of Pharmaceutical Biology, Institute of Pharmaceutical and Biomedical Sciences, Johannes Gutenberg University, Mainz 55128, Germany
| | - Zheyong Xue
- Key Laboratory of Saline-alkali Vegetation Ecology Restoration (Northeast Forestry University), Ministry of Education, Harbin, China.
| | - Xin Hua
- Key Laboratory of Saline-alkali Vegetation Ecology Restoration (Northeast Forestry University), Ministry of Education, Harbin, China.
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Afifi W, Hegazy M, Metwaly A, Mostafa A, Radwan M, M. Mehany A, Ahmed E, Enany S, Magdeldin S, ElSohly M. Biological and chemical evaluation of some African plants belonging to Kalanchoe species: Antitrypanosomal, cytotoxic, antitopoisomerase I activities and chemical profiling using ultra-performance liquid chromatography/quadrupole-time-of-flight mass spectrometer. Pharmacogn Mag 2021. [DOI: 10.4103/pm.pm_232_20] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Hussein IA, Srivedavyasasri R, El-Hela AA, Mohammad AEI, Ross SA. Chemical constituents from Silene schimperiana Boiss. belonging to caryophyllaceae and their chemotaxonomic significance. BIOCHEM SYST ECOL 2020. [DOI: 10.1016/j.bse.2020.104113] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Biharee A, Sharma A, Kumar A, Jaitak V. Antimicrobial flavonoids as a potential substitute for overcoming antimicrobial resistance. Fitoterapia 2020; 146:104720. [PMID: 32910994 DOI: 10.1016/j.fitote.2020.104720] [Citation(s) in RCA: 70] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2020] [Revised: 08/21/2020] [Accepted: 09/01/2020] [Indexed: 12/30/2022]
Abstract
BACKGROUND Infectious diseases are the leading cause of death in 21st century due to antimicrobial resistance and scarcity of new molecules to undertake rising infections. There could be a multiple reasons behind antimicrobial resistance whether it is increased drug metabolism or bacterial endotoxins. The demand of effective medication is increasing day by day to treat microbial infections and combat antimicrobial resistance. In recent years most of the synthetic antimicrobials developed resistance so natural products could provide better options to fulfill this demand. There has been increasing interest in the research on flavonoids because various flavonoids were found to be effective against pathogenic microorganisms. OBJECTIVE The objective of this article will be to explore antimicrobial activity of flavonoids with special focus on their possible mechanism of action. METHODS The article reviewed recent literature related to flavonoids with antimicrobial activity, which were isolated from various sources and the compounds showing fairly good activity against tested microbial species were discussed. RESULTS By throughout literature review it has been found that flavonoids show antimicrobial effect by inhibiting virulence factors, efflux pump, biofilm formation, membrane disruption, cell envelop synthesis, nucleic acid synthesis, and bacterial motility inhibition. CONCLUSION Most of the antimicrobial drugs available now a days are ineffective due to development of resistance to them. Flavonoids have the potential to overcome this emerging crisis as this class of natural products showed the antimicrobial activity by different mechanisms than those of conventional drugs, so flavonoid could be an effective treatment of pathogenic infections.
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Affiliation(s)
- Avadh Biharee
- Laboratory of Natural Products, Department of Pharmaceutical Sciences and Natural Products, Central University of Punjab, Bathinda, Punjab 151001, India
| | - Aditi Sharma
- Laboratory of Natural Products, Department of Pharmaceutical Sciences and Natural Products, Central University of Punjab, Bathinda, Punjab 151001, India
| | - Amit Kumar
- Laboratory of Natural Products, Department of Pharmaceutical Sciences and Natural Products, Central University of Punjab, Bathinda, Punjab 151001, India
| | - Vikas Jaitak
- Laboratory of Natural Products, Department of Pharmaceutical Sciences and Natural Products, Central University of Punjab, Bathinda, Punjab 151001, India..
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Nayak M, Nagarajan A, Majeed M, Jamsheeda M, Choudhury AK. Flavonoids from Artocarpus hirsutus Lam: Synthesis of new prenyl ethers, acetates and their anti-acne activity. ACTA ACUST UNITED AC 2017. [DOI: 10.1080/23312009.2017.1416557] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Mahadeva Nayak
- Sami Labs Limited-R&D Centre, 19/1, 19/2, 1st Main, 2nd Phase, Peenya Industrial Area, Peenya, Bangalore 560058, India
| | - A. Nagarajan
- Sami Labs Limited-R&D Centre, 19/1, 19/2, 1st Main, 2nd Phase, Peenya Industrial Area, Peenya, Bangalore 560058, India
| | - Muhammed Majeed
- Sami Labs Limited-R&D Centre, 19/1, 19/2, 1st Main, 2nd Phase, Peenya Industrial Area, Peenya, Bangalore 560058, India
- Sabinsa Corporation, 20-Lake Drive, East Windsor NJ-08520, USA
| | - M. Jamsheeda
- Sami Labs Limited-R&D Centre, 19/1, 19/2, 1st Main, 2nd Phase, Peenya Industrial Area, Peenya, Bangalore 560058, India
| | - Ambar K. Choudhury
- Sami Labs Limited-R&D Centre, 19/1, 19/2, 1st Main, 2nd Phase, Peenya Industrial Area, Peenya, Bangalore 560058, India
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Ha MT, Tran MH, Ah KJ, Jo KJ, Kim J, Kim WD, Cheon WJ, Woo MH, Ryu SH, Min BS. Potential pancreatic lipase inhibitory activity of phenolic constituents from the root bark of Morus alba L. Bioorg Med Chem Lett 2016; 26:2788-2794. [PMID: 27156775 DOI: 10.1016/j.bmcl.2016.04.066] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2016] [Revised: 04/20/2016] [Accepted: 04/23/2016] [Indexed: 12/25/2022]
Abstract
Detailed phytochemical investigation from the root bark of Morus alba resulted in the isolation of eleven new compounds, including seven 2-arylbenzofuran derivatives (morusalfurans A-G), three flavonoids (morusalnols A-C), and one geranylated stilbene (morusibene A), as well as 22 known compounds. The structures of the identified compounds were elucidated based on a comprehensive analysis of spectroscopic data and Mosher's method. Compounds 2, 3, 6-8, 11, 23, 24, and 29 showed potent inhibition of PL in comparison with the positive control treatment (orlistat, IC50=0.012μM), with IC50 values ranging from 0.09 to 0.92μM.
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Affiliation(s)
- Manh Tuan Ha
- College of Pharmacy, Drug Research and Development Center, Catholic University of Daegu, Gyeongbuk 712-702, Republic of Korea; Institute of Marine Biochemistry, Vietnam Academy of Science and Technology, 18-Hoang Quoc Viet, Cau Giay District, Hanoi, Vietnam
| | - Manh Hung Tran
- College of Pharmacy, Drug Research and Development Center, Catholic University of Daegu, Gyeongbuk 712-702, Republic of Korea
| | - Kim Jeong Ah
- College of Pharmacy, Kyungpook National University, Daegu 702-701, Republic of Korea
| | - Kyung-Jin Jo
- Division of Molecular and Life Sciences, Pohang University of Science and Technology, Pohang, Republic of Korea
| | - Jaewang Kim
- Division of Molecular and Life Sciences, Pohang University of Science and Technology, Pohang, Republic of Korea
| | - Wook Dong Kim
- Gyeongsanbuk-do Forest & Environment Research Institute, Gyeongju 780-936, Republic of Korea
| | - Woo Jae Cheon
- Gyeongsanbuk-do Forest & Environment Research Institute, Gyeongju 780-936, Republic of Korea
| | - Mi Hee Woo
- College of Pharmacy, Drug Research and Development Center, Catholic University of Daegu, Gyeongbuk 712-702, Republic of Korea
| | - Sung Ho Ryu
- Division of Molecular and Life Sciences, Pohang University of Science and Technology, Pohang, Republic of Korea
| | - Byung Sun Min
- College of Pharmacy, Drug Research and Development Center, Catholic University of Daegu, Gyeongbuk 712-702, Republic of Korea.
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Antibacterial and antioxidant activities of derriobtusone A isolated from Lonchocarpus obtusus. BIOMED RESEARCH INTERNATIONAL 2014; 2014:248656. [PMID: 24991543 PMCID: PMC4058680 DOI: 10.1155/2014/248656] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/27/2014] [Accepted: 05/09/2014] [Indexed: 01/20/2023]
Abstract
This study evaluated the effect of derriobtusone A, a flavonoid isolated from Lonchocarpus obtusus, on two important pathogenic bacteria, Staphylococcus aureus and Escherichia coli, as well as its antioxidant activity and toxicity. Planktonic growth assays were performed, and the inhibition of biofilm formation was evaluated. In addition, antioxidant activity was assessed by DPPH radical scavenging assay, ferrous ion chelating assay, ferric-reducing antioxidant power assay, and β-carotene bleaching assay. Toxicity was evaluated by the brine shrimp lethality test. Results showed that derriobtusone A completely inhibited the planktonic growth of S. aureus at 250 and 500 μg/mL; however, it did not have the same activity on E. coli. Derriobtusone A reduced the biomass and colony-forming unit (cfu) of S. aureus biofilm at concentrations of 250 and 500 μg/mL. In various concentrations, it reduced the biofilm biomass of E. coli, and, in all concentrations, it weakly reduced the cfu. Derriobtusone A showed highly efficient antioxidant ability in scavenging DPPH radical and inhibiting β-carotene oxidation. The compound showed no lethality to Artemia sp. nauplii. In conclusion, derriobtusone A may be an effective molecule against S. aureus and its biofilm, as well as a potential antioxidant compound with no toxicity.
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New thiophene and flavonoid from Tagetes minuta leaves growing in Saudi Arabia. Molecules 2014; 19:2819-28. [PMID: 24599122 PMCID: PMC6271555 DOI: 10.3390/molecules19032819] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2014] [Revised: 02/25/2014] [Accepted: 02/25/2014] [Indexed: 11/21/2022] Open
Abstract
Phytochemical investigation of the methanolic extract of Tagetes minuta L. (Asteraceae) leaves resulted in the isolation and identification of two new compounds: 5-methyl-2,2',5',2'',5'',2''',5''',2''''-quinquethiophene (1) and quercetagetin-6-O-(6-O-caffeoyl-β-d-glucopyranoside) (9), in addition to seven known compounds: quercetin-3,6-dimethyl ether (2), quercetin-3-methyl ether (3), quercetin (4), axillarin-7-O-β-d-glucopyranoside (5), quercetagetin-3,7-dimethoxy-6-O-β-d-glucopyranoside (6), quercetagetin-7-methoxy-6-O-β-d-glucopyranoside (7), and quercetagetin-6-O-β-d-glucopyranoside (8). The compounds were identified by UV, IR, 1D, 2D NMR, and HRESIMS spectral data. They showed significant antioxidant activity, comparable with that of propyl gallate. Compounds 8 and 3 showed weak to moderate antileishmanial and antimalarial activities, with IC50 values of 31.0 μg/mL and 4.37 μg/mL, respectively.
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Metwaly AM, Kadry HA, El-Hela AA, Mohammad AEI, Ma G, Cutler SJ, Ross SA. Nigrosphaerin A a new isochromene derivative from the endophytic fungus Nigrospora sphaerica. PHYTOCHEMISTRY LETTERS 2014; 7:1-5. [PMID: 27708743 PMCID: PMC5047436 DOI: 10.1016/j.phytol.2013.09.001] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Nigrosphaerin A, a new isochromene derivative (1), was isolated from the endophytic fungus Nigrospora sphaerica and chemically identified as 3-(3,4-dihydroxyphenyl)-4,6,8-trihydroxy-1H-isochromen-1-one-6-O-β-d-glucopyranoside. In addition nineteen known compounds (2-20) were isolated from the same fungus and chemically identified. Compounds (1-3, 5, and 7-16) were isolated for the first time from this fungus. In vitro antileukemic, antileishmanial, antifungal, antibacterial and antimalarial activities of (1-20) were examined. Compounds 5, 7, 9 and 10 showed good antileukemic activity against HL60 cells with IC50 values of 0.03, 0.39, 0.2 and 0.4 μg/mL, respectively and against K562 cells with IC50 values of 0.35, 0.35, 0.49 and 0.01 μg/mL, respectively. Compounds 3, 4 and 6 showed moderate antileishmanial activity with IC50 values of 30.2, 26.4 and 36.4 μg/ml, respectively. Compound 7 showed moderate antifungal activity against Cryptococcus neoformans with IC50 value of 14.8 μg/mL.
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Affiliation(s)
- Ahmed M. Metwaly
- National Center for Natural Products Research, School of Pharmacy, The University of Mississippi, University, MS 38677, USA
- Department of Pharmacognosy, Faculty of Pharmacy, University of Al-Azhar, Cairo, Egypt
| | - Hazem A. Kadry
- Department of Pharmacognosy, Faculty of Pharmacy, University of Al-Azhar, Cairo, Egypt
| | - Atef A. El-Hela
- Department of Pharmacognosy, Faculty of Pharmacy, University of Al-Azhar, Cairo, Egypt
| | | | - Guoyi Ma
- National Center for Natural Products Research, School of Pharmacy, The University of Mississippi, University, MS 38677, USA
| | - Stephen J. Cutler
- Department of Medicinal Chemistry, School of Pharmacy, The University of Mississippi, University, MS 38677, USA
| | - Samir A. Ross
- National Center for Natural Products Research, School of Pharmacy, The University of Mississippi, University, MS 38677, USA
- Department of Pharmacognosy, School of Pharmacy, The University of Mississippi, University, MS 38677, USA
- Corresponding author at: National Center for Natural Products Research, School of Pharmacy, The University of Mississippi, University, MS 38677, USA. Tel.: +1 662 915 1031; fax: +1 662 915 7989. (S.A. Ross)
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Wang Z, Yang L, Yang X, Zhang X. Advances in the First Total Synthesis of Natural Flavonoids. SYNTHETIC COMMUN 2013. [DOI: 10.1080/00397911.2013.820835] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Zhonglei Wang
- a School of Chinese Pharmacy, Beijing University of Chinese Medicine , Beijing , China
| | - Liyan Yang
- b College of Science, China University of Petroleum , Beijing , China
| | - Xiuwei Yang
- c School of Pharmaceutical Sciences, Peking University , Beijing , China
| | - Xiaohua Zhang
- a School of Chinese Pharmacy, Beijing University of Chinese Medicine , Beijing , China
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Recent advances in understanding the antibacterial properties of flavonoids. Int J Antimicrob Agents 2011; 38:99-107. [PMID: 21514796 DOI: 10.1016/j.ijantimicag.2011.02.014] [Citation(s) in RCA: 626] [Impact Index Per Article: 48.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2011] [Revised: 02/16/2011] [Accepted: 02/17/2011] [Indexed: 01/14/2023]
Abstract
Antibiotic resistance is a major global problem and there is a pressing need to develop new therapeutic agents. Flavonoids are a family of plant-derived compounds with potentially exploitable activities, including direct antibacterial activity, synergism with antibiotics, and suppression of bacterial virulence. In this review, recent advances towards understanding these properties are described. Information is presented on the ten most potently antibacterial flavonoids as well as the five most synergistic flavonoid-antibiotic combinations tested in the last 6 years (identified from PubMed and ScienceDirect). Top of these respective lists are panduratin A, with minimum inhibitory concentrations (MICs) of 0.06-2.0 μg/mL against Staphylococcus aureus, and epicatechin gallate, which reduces oxacillin MICs as much as 512-fold. Research seeking to improve such activity and understand structure-activity relationships is discussed. Proposed mechanisms of action are also discussed. In addition to direct and synergistic activities, flavonoids inhibit a number of bacterial virulence factors, including quorum-sensing signal receptors, enzymes and toxins. Evidence of these molecular effects at the cellular level include in vitro inhibition of biofilm formation, inhibition of bacterial attachment to host ligands, and neutralisation of toxicity towards cultured human cells. In vivo evidence of disruption of bacterial pathogenesis includes demonstrated efficacy against Helicobacter pylori infection and S. aureus α-toxin intoxication.
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Affiliation(s)
- Nigel C Veitch
- Jodrell Laboratory, Royal Botanic Gardens, Kew, Richmond, Surrey TW93AB, UK.
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Raghukumar R, Vali L, Watson D, Fearnley J, Seidel V. Antimethicillin-resistant Staphylococcus aureus (MRSA) activity of 'pacific propolis' and isolated prenylflavanones. Phytother Res 2010; 24:1181-7. [PMID: 20077439 DOI: 10.1002/ptr.3096] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The need to discover and develop alternative therapies to treat methicillin-resistant Staphylococcus aureus (MRSA) infections is timely. This study was undertaken to purify and identify some anti-MRSA constituents from propolis, a natural product from the beehive traditionally used in folk medicine for its antimicrobial properties. A crude extract of propolis originating from the Solomon Islands ('Pacific propolis') was screened, using an agar dilution assay, in vitro against 15 MRSA clinical isolates. Results revealed activity worthy of further investigation, and subsequent purification work on this crude extract afforded 23 fractions. Further purification of active fractions led to the isolation of compounds 1-4, characterized upon analysis of their spectroscopic data (1D- and 2D-NMR, MS) and by comparison with the literature, as the prenylflavanones propolin H (1), propolin G (2), propolin D (3), and propolin C (4). This study is the first to report the anti-MRSA activity of 'Pacific propolis' and the presence of prenylflavanones in the propolis sample selected. The anti-MRSA activity of propolin D (3) (MIC 8-16 mg/L) and propolin C (4) (MIC 8-32 mg/L) is reported for the first time.
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Affiliation(s)
- Raghavendra Raghukumar
- Natural Products Research Laboratories, Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, UK
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