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Lo MM, Benfodda Z, Dunyach-Rémy C, Bénimélis D, Roulard R, Fontaine JX, Mathiron D, Quéro A, Molinié R, Meffre P. Isolation and Identification of Flavones Responsible for the Antibacterial Activities of Tillandsia bergeri Extracts. ACS OMEGA 2022; 7:35851-35862. [PMID: 36249367 PMCID: PMC9557886 DOI: 10.1021/acsomega.2c04195] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/04/2022] [Accepted: 08/23/2022] [Indexed: 06/16/2023]
Abstract
Plants are an everlasting inspiration source of biologically active compounds. Among these medicinal plants, the biological activity of extracts from some species of the Tillandsia genus has been studied, but the phytochemistry of the hardy species Tillandsia bergeri remains unknown. The aim of the present study was to perform the first phytochemical study of T. bergeri and to identify the compounds responsible for the antibacterial activity of T. bergeri extracts. Soxhlet extraction of predried and grinded leaves was first performed using four increasing polarity solvents. A bio-guided fractionation was performed using agar overlay bioautography as a screening method against 12 Gram-positive, Gram-negative, sensitive, and resistant bacterial strains. The results showed the inhibition of Gram-positive methicillin-sensitive Staphylococcus aureus ATCC 29213 (MSSA), methicillin-resistant S. aureus N-SARM-1 (MRSA), and Staphylococcus caprae ATCC 35538 by the dichloromethane fraction. A phytochemical investigation led to the isolation and identification by high-resolution mass spectrometry and nuclear magnetic resonance of the two flavones penduletin and viscosine, responsible for this antibacterial activity. For viscosine, the minimum inhibitory concentration (MIC) value is equal to 128 μg/mL against MSSA and is equal to 256 μg/mL against MRSA and S. caprae. The combination of these compounds with vancomycin and cloxacillin showed a decrease in MICs of the antibiotics. Penduletin showed synergistic activity when combined with vancomycin against MSSA (FICI < 0.258) and S. caprae (FICI < 0.5). Thus, unexplored Tillandsia species may represent a valuable source for potential antibiotics and adjuvants.
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Affiliation(s)
- Mame-Marietou Lo
- UNIV.
NIMES, UPR CHROME, 5
rue du Dr Georges Salan, F-30021 Nîmes Cedex 1, France
| | - Zohra Benfodda
- UNIV.
NIMES, UPR CHROME, 5
rue du Dr Georges Salan, F-30021 Nîmes Cedex 1, France
| | - Catherine Dunyach-Rémy
- Institut
National de la Santé et de la Recherche Médicale, U1047, Montpellier University, CHU de Nîmes, Place du Pr R. Debré, 30029 Nîmes, France
| | - David Bénimélis
- UNIV.
NIMES, UPR CHROME, 5
rue du Dr Georges Salan, F-30021 Nîmes Cedex 1, France
| | - Romain Roulard
- UMR
1158 Transfontalière BioEcoAgro, BIOlogie des Plantes et Innovation
(BIOPI), UPJV, Faculté de Pharmacie, 1 rue des Louvels, 80025 Amiens CEDEX, France
| | - Jean-Xavier Fontaine
- UMR
1158 Transfontalière BioEcoAgro, BIOlogie des Plantes et Innovation
(BIOPI), UPJV, Faculté de Pharmacie, 1 rue des Louvels, 80025 Amiens CEDEX, France
| | - David Mathiron
- Plateforme-Analytique, Université
de Picardie Jules Verne, 33 rue Saint Leu, 80039 Amiens, France
| | - Anthony Quéro
- UMR
1158 Transfontalière BioEcoAgro, BIOlogie des Plantes et Innovation
(BIOPI), UPJV, Faculté de Pharmacie, 1 rue des Louvels, 80025 Amiens CEDEX, France
| | - Roland Molinié
- UMR
1158 Transfontalière BioEcoAgro, BIOlogie des Plantes et Innovation
(BIOPI), UPJV, Faculté de Pharmacie, 1 rue des Louvels, 80025 Amiens CEDEX, France
| | - Patrick Meffre
- UNIV.
NIMES, UPR CHROME, 5
rue du Dr Georges Salan, F-30021 Nîmes Cedex 1, France
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Karim N, Irshad S, Khan I, Mohammad A, Anis I, Shah MR, Khan I, Chebib M. GABA(A) receptor modulation and neuropharmacological activities of viscosine isolated from Dodonaea viscosa (Linn). Pharmacol Biochem Behav 2015; 136:64-72. [PMID: 26187002 DOI: 10.1016/j.pbb.2015.07.006] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/17/2015] [Revised: 07/07/2015] [Accepted: 07/09/2015] [Indexed: 01/25/2023]
Abstract
The objective of the present study was to evaluate the modulation of GABA-evoked currents by the flavonoid viscosine at recombinant GABA(A) receptors, and subsequently to study its anxiolytic, sedative and anticonvulsant activities. Viscosine (1-300μM) positively modulated GABA-evoked currents at human α1β2γ2L and α2β2γ2L GABA(A) receptors expressed in Xenopus oocytes in a flumazenil insensitive manner. In behavioral studies, viscosine at doses of 10-100mg/kg (i.p.) exerted significant anxiolytic effects in the elevated plus maze, light-dark and open field tests (*P<0.05, **P<0.01, ***P<0.001 n=6, One-way ANOVA post-Dunnett's test), and sedative effects at high doses (100mg/kg i.p.) in hole board and thiopental induced sleep time tests. The anxiolytic effect in the elevated plus maze test was not blocked by flumazenil whereas pentylenetetrazole (PTZ) completely attenuated the effect, indicating that the activity was mediated via the non-benzodiazepine sites of GABA(A) receptors. Furthermore, viscosine at doses of 10-100mg/kg (i.p.) exerted anticonvulsant effects in a dose-dependent manner in PTZ, picrotoxin and bicuculline induced seizure paradigms (*P<0.05, **P<0.01,***P<0.001 n=6, One-way ANOVA post-Dunnett's test). In conclusion, the results of the present study suggest that the anxiolytic and anticonvulsant actions of viscosine are likely mediated via its positive allosteric modulatory action of GABA at different GABA(A) receptor subtypes.
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Affiliation(s)
- Nasiara Karim
- Department of Pharmacy, University of Malakand, Chakdara, Pakistan; Faculty of Pharmacy, The University of Sydney, NSW, Australia.
| | - Shahid Irshad
- Department of Pharmacy, University of Malakand, Chakdara, Pakistan
| | - Imran Khan
- Department of Pharmacy, University of Malakand, Chakdara, Pakistan
| | - Akhtar Mohammad
- Department of Chemistry, University of Karachi, Karachi 75270, Pakistan
| | - Itrat Anis
- Department of Chemistry, University of Karachi, Karachi 75270, Pakistan
| | - Muhammad Raza Shah
- H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi 75270, Pakistan
| | - Inamullah Khan
- Department of Pharmacy, University Peshawar, Peshawar, Pakistan
| | - Mary Chebib
- Faculty of Pharmacy, The University of Sydney, NSW, Australia
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