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Feunaing RT, Tamfu AN, Gbaweng AJY, Kucukaydin S, Tchamgoue J, Lannang AM, Lenta BN, Kouam SF, Duru ME, Anouar EH, Talla E, Dinica RM. In Vitro and Molecular Docking Evaluation of the Anticholinesterase and Antidiabetic Effects of Compounds from Terminalia macroptera Guill. & Perr. (Combretaceae). Molecules 2024; 29:2456. [PMID: 38893333 PMCID: PMC11174011 DOI: 10.3390/molecules29112456] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2024] [Revised: 05/17/2024] [Accepted: 05/19/2024] [Indexed: 06/21/2024] Open
Abstract
Alzheimer's disease (AD) and diabetes are non-communicable diseases with global impacts. Inhibitors of acetylcholinesterase (AChE) and butyrylcholinesterase (BChE) are suitable therapies for AD, while α-amylase and α-glucosidase inhibitors are employed as antidiabetic agents. Compounds were isolated from the medicinal plant Terminalia macroptera and evaluated for their AChE, BChE, α-amylase, and α-glucosidase inhibitions. From 1H and 13C NMR data, the compounds were identified as 3,3'-di-O-methyl ellagic acid (1), 3,3',4'-tri-O-methyl ellagic acid-4-O-β-D-xylopyranoside (2), 3,3',4'-tri-O-methyl ellagic acid-4-O-β-D-glucopyranoside (3), 3,3'-di-O-methyl ellagic acid-4-O-β-D-glucopyranoside (4), myricetin-3-O-rhamnoside (5), shikimic acid (6), arjungenin (7), terminolic acid (8), 24-deoxysericoside (9), arjunglucoside I (10), and chebuloside II (11). The derivatives of ellagic acid (1-4) showed moderate to good inhibition of cholinesterases, with the most potent being 3,3'-di-O-methyl ellagic acid, with IC50 values of 46.77 ± 0.90 µg/mL and 50.48 ± 1.10 µg/mL against AChE and BChE, respectively. The compounds exhibited potential inhibition of α-amylase and α-glucosidase, especially the phenolic compounds (1-5). Myricetin-3-O-rhamnoside had the highest α-amylase inhibition with an IC50 value of 65.17 ± 0.43 µg/mL compared to acarbose with an IC50 value of 32.25 ± 0.36 µg/mL. Two compounds, 3,3'-di-O-methyl ellagic acid (IC50 = 74.18 ± 0.29 µg/mL) and myricetin-3-O-rhamnoside (IC50 = 69.02 ± 0.65 µg/mL), were more active than the standard acarbose (IC50 = 87.70 ± 0.68 µg/mL) in the α-glucosidase assay. For α-glucosidase and α-amylase, the molecular docking results for 1-11 reveal that these compounds may fit well into the binding sites of the target enzymes, establishing stable complexes with negative binding energies in the range of -4.03 to -10.20 kcalmol-1. Though not all the compounds showed binding affinities with cholinesterases, some had negative binding energies, indicating that the inhibition was thermodynamically favorable.
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Affiliation(s)
- Romeo Toko Feunaing
- Department of Chemistry, Faculty of Sciences, University of Ngaoundere, Ngaoundere P.O. Box 454, Cameroon
| | - Alfred Ngenge Tamfu
- Department of Chemical Engineering, School of Chemical Engineering and Mineral Industries, University of Ngaoundere, Ngaoundere P.O. Box 454, Cameroon
- Department of Medical Services and Techniques, Koycegiz Vocational School of Health Services, Mugla Sitki Kocman University, 48800 Mugla, Turkey
- Department of Chemistry, Faculty of Science, Mugla Sitki Kocman University, 48000 Mugla, Turkey
- Department of Chemistry, Physics and Environment, Faculty of Sciences and Environment, ‘Dunarea de Jos University’, 47 Domneasca Str., 800008 Galati, Romania
| | - Abel Joel Yaya Gbaweng
- Department of Chemistry, Faculty of Sciences, University of Ngaoundere, Ngaoundere P.O. Box 454, Cameroon
| | - Selcuk Kucukaydin
- Department of Medical Services and Techniques, Koycegiz Vocational School of Health Services, Mugla Sitki Kocman University, 48800 Mugla, Turkey
- Department of Chemistry, Faculty of Science, Mugla Sitki Kocman University, 48000 Mugla, Turkey
| | - Joseph Tchamgoue
- Department of Chemistry, Higher Teacher Training College, The University of Yaoundé 1, Yaoundé P.O. Box 47, Cameroon
- Department of Organic Chemistry, Faculty of Science, University of Yaounde 1, Yaoundé P.O. Box 812, Cameroon
| | - Alain Meli Lannang
- Department of Chemical Engineering, School of Chemical Engineering and Mineral Industries, University of Ngaoundere, Ngaoundere P.O. Box 454, Cameroon
| | - Bruno Ndjakou Lenta
- Department of Chemistry, Higher Teacher Training College, The University of Yaoundé 1, Yaoundé P.O. Box 47, Cameroon
| | - Simeon Fogue Kouam
- Department of Chemistry, Higher Teacher Training College, The University of Yaoundé 1, Yaoundé P.O. Box 47, Cameroon
| | - Mehmet Emin Duru
- Department of Chemistry, Faculty of Science, Mugla Sitki Kocman University, 48000 Mugla, Turkey
| | - El Hassane Anouar
- Department of Chemistry, College of Sciences and Humanities in Al-Kharj, Prince Sattam bin Ab-dulaziz University, Al-Kharj P.O. Box 83, Saudi Arabia
| | - Emmanuel Talla
- Department of Chemistry, Faculty of Sciences, University of Ngaoundere, Ngaoundere P.O. Box 454, Cameroon
- Department of Chemical Engineering, School of Chemical Engineering and Mineral Industries, University of Ngaoundere, Ngaoundere P.O. Box 454, Cameroon
| | - Rodica Mihaela Dinica
- Department of Chemistry, Physics and Environment, Faculty of Sciences and Environment, ‘Dunarea de Jos University’, 47 Domneasca Str., 800008 Galati, Romania
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Doğaç Yİ, Tamfu AN, Bozkurt S, Kayhan M, Teke M, Ceylan O. Inhibition of biofilm, quorum-sensing, and swarming motility in pathogenic bacteria by magnetite, manganese ferrite, and nickel ferrite nanoparticles. Biotechnol Appl Biochem 2024; 71:356-371. [PMID: 38062650 DOI: 10.1002/bab.2545] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Revised: 10/20/2023] [Accepted: 11/25/2023] [Indexed: 04/11/2024]
Abstract
Resistance to antibiotics by pathogenic bacteria constitutes a health burden and nanoparticles (NPs) are being developed as alternative and multipurpose antimicrobial substances. Magnetite (Fe3O4 np), manganese ferrite (MnFe2O4 np) and nickel ferrite (NiFe3O4 np) NPs were synthesized and characterized using thermogravimetric analysis, transmission electron microscopy, Fourier transformed infra-red, and X-ray diffraction. The minimal inhibitory concentrations (MIC) ranged from 0.625 to 10 mg/mL against gram-positive (Staphylococcus aureus ATCC 25923 and Enterococcus faecalis ATCC 29212), gram-negative (Escherichia coli ATCC 25922 and Pseudomonas aeruginosa ATCC 27853) and candida (Candida albicans ATCC 10239 and Candida tropicalis ATCC 13803) species. The NPs exhibited violacein inhibition against Chromobacterium violaceum CV12472 of 100% at MIC and reduced to 27.2% ± 0.8% for magnetite NPs, 12.7% ± 0.3% for manganese ferrite NPs and 43.1% ± 0.2% for nickel ferrite NPs at MIC/4. Quorum-sensing (QS) inhibition zones against C. violaceum CV026 were 12.5 ±0.6 mm for Fe3O4 np, 09.1 ± 0.5 mm for MnFe3O4 NP and 17.0 ± 1.2 mm for NiFe3O4 np. The NPs inhibited swarming motility against P. aeruginosa PA01 and biofilm against six pathogens and the gram-positive biofilms were more susceptible than the gram-negative ones. The NiFe2O4 np had highest antibiofilm activity against gram-positive and gram-negative bacteria as well as highest QS inhibition while Fe3O4 NP had highest biofilm inhibition against candida species. The synthesized magnetic NPs can be used in developing anti-virulence drugs which reduce pathogenicity of bacteria as well as resistance.
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Affiliation(s)
- Yasemin İspirli Doğaç
- Department of Chemistry and Chemical Processing Technology, Mugla Vocational School, Mugla Sitki Kocman University, Mugla, Turkey
| | - Alfred Ngenge Tamfu
- Department of Chemical Engineering, School of Chemical Engineering and Mineral Industries, University of Ngaoundere, Ngaoundere, Cameroon
- Scientific Analysis Technological Application and Research Center (UBATAM), Usak University, Usak, Turkey
- Food Quality Control and Analysis Program, Ula Ali Kocman Vocational School, Muğla Sitki Koçman University, Ula, , Muğla, Turkey
| | - Selahattin Bozkurt
- Scientific Analysis Technological Application and Research Center (UBATAM), Usak University, Usak, Turkey
- Vocational School of Health Services, Usak University, Usak, Turkey
| | - Mehmet Kayhan
- Scientific Analysis Technological Application and Research Center (UBATAM), Usak University, Usak, Turkey
| | - Mustafa Teke
- Department of Chemistry, Faculty of Science, Mugla Sitki Kocman University, Mugla, Turkey
| | - Ozgur Ceylan
- Food Quality Control and Analysis Program, Ula Ali Kocman Vocational School, Muğla Sitki Koçman University, Ula, , Muğla, Turkey
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Haouam C, Boudiba S, Tamfu AN, Kucukaydin S, Hanini K, Zohra HF, Hioun S, Botezatu AD, Ceylan Ö, Boudiba L, Duru ME, Dinica RM. Assessment of Chemical Composition and In Vitro Antioxidant, Antidiabetic, Anticholinesterase and Microbial Virulence-Quenching Effects of Salad Burnet ( Sanguisorba minor L.) Harvested from Algeria. PLANTS (BASEL, SWITZERLAND) 2023; 12:4134. [PMID: 38140461 PMCID: PMC10748046 DOI: 10.3390/plants12244134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2023] [Revised: 12/07/2023] [Accepted: 12/09/2023] [Indexed: 12/24/2023]
Abstract
Sanguisorba minor is a medicinal vegetable used in seasoning desserts, juices, and beverages. An evaluation of the total flavonoid, phenolic, tannin and anthocyanin contents indicated that these classes of compounds are distributed variably in the different fractions. In summary, the HPLC-DAD analyses enabled the identification and quantification of thirteen phenolic compounds in an ethyl acetate extract (EAE), nine in a dichloromethane extract (DCME), seven in an aqueous extract (AQE) and four in a butanol extract (BE). Rutin was the most abundant phenolic compound in the BE (278.4 ± 1.20 µg/g) and AQE (32.87 ± 0.23 µg/g) fractions, while apigenin was the most abundant in the DCME (84.75 ± 0.60 µg/g) and EAE (156.8 ± 0.95 µg/g) fractions. The presence of phenolic compounds in the fractions conferred good antioxidant capacity, especially the EAE and DCME fractions, which both exhibited higher antioxidant effects than BHA and α-tocopherol in DPPH• and CUPRAC assays. Additionally, in the ABTS•+ assay, EAE (IC50 = 9.27 ± 0.33 µg/mL) was more active than α-tocopherol (IC50 = 35.50 ± 0.55 µg/mL), and BHA (IC50 = 12.70 ± 0.10 µg/mL). At 200 µg/mL, the fractions inhibited acetylcholinesterase and butyrylcholinesterase as well as α-amylase and α-glucosidase, indicating that they can slow neurodegeneration and hyperglycemia. Minimal inhibitory concentration (MIC) values ranged from 0.312 mg/mL to 1.25 mg/mL, and fractions showed good biofilm inhibition against Staphylococcus aureus and Escherichia coli. The extracts exhibited good violacein inhibition in Chromobacterium violaceum CV12472 and Chromobacterium violaceum CV026, despite the supply of external acyl-homoserine lactone to CV026. The antioxidant, quorum-sensing, antibiofilm and enzyme inhibition attributes indicate the potential for the application of S. minor as a food preservative.
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Affiliation(s)
- Chahrazed Haouam
- Laboratory of Applied Chemistry and Renewable Energies (LACRE), Echahid Cheikh Larbi Tebessi University, Constantine Road, Tebessa 12002, Algeria (H.F.Z.)
| | - Sameh Boudiba
- Laboratory of Applied Chemistry and Renewable Energies (LACRE), Echahid Cheikh Larbi Tebessi University, Constantine Road, Tebessa 12002, Algeria (H.F.Z.)
| | - Alfred Ngenge Tamfu
- Department of Chemical Engineering, School of Chemical Engineering and Mineral Industries, University of Ngaoundere, Ngaoundere 454, Cameroon
- Food Quality Control and Analysis Program, Ula Ali Kocman Vocational School, Mugla Sitki Kocman University, Mugla 48147, Turkey
- Department of Chemistry, Faculty of Science, Mugla Sitki Kocman University, Mugla 48000, Turkey
| | - Selcuk Kucukaydin
- Department of Chemistry, Faculty of Science, Mugla Sitki Kocman University, Mugla 48000, Turkey
- Department of Medical Services and Techniques, Koycegiz Vocational School of Health Services, Mugla Sitki Kocman University, Mugla 48800, Turkey
| | - Karima Hanini
- Laboratory of Applied Chemistry and Renewable Energies (LACRE), Echahid Cheikh Larbi Tebessi University, Constantine Road, Tebessa 12002, Algeria (H.F.Z.)
| | - Haouaouchi Fatma Zohra
- Laboratory of Applied Chemistry and Renewable Energies (LACRE), Echahid Cheikh Larbi Tebessi University, Constantine Road, Tebessa 12002, Algeria (H.F.Z.)
- Laboratory of Organic Materials and Heterochemistry (LOMH), Echahid Cheikh Larbi Tebessi University, Constantine Road, Tebessa 12002, Algeria
| | - Soraya Hioun
- Department of Natural and Life Sciences FSESNV, Echahid Cheikh Larbi Tebessi University, Constantine Road, Tebessa 12002, Algeria
| | - Andreea Dediu Botezatu
- Department of Chemistry, Physics and Environment, Faculty of Sciences and Environment, Dunarea de Jos University, 47 Domneasca Str., 800008 Galati, Romania
| | - Özgür Ceylan
- Food Quality Control and Analysis Program, Ula Ali Kocman Vocational School, Mugla Sitki Kocman University, Mugla 48147, Turkey
| | - Louiza Boudiba
- Laboratory of Applied Chemistry and Renewable Energies (LACRE), Echahid Cheikh Larbi Tebessi University, Constantine Road, Tebessa 12002, Algeria (H.F.Z.)
| | - Mehmet Emin Duru
- Department of Chemistry, Faculty of Science, Mugla Sitki Kocman University, Mugla 48000, Turkey
| | - Rodica Mihaela Dinica
- Department of Chemistry, Physics and Environment, Faculty of Sciences and Environment, Dunarea de Jos University, 47 Domneasca Str., 800008 Galati, Romania
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Munvera AM, Alfred Ngenge T, Ouahouo BMW, Kucukaydin S, Nyemb JN, Fokam Mafo MA, Djappa Tchapo EC, Mkounga P, Nkengfack AE. Cholinesterase, α-glucosidase, tyrosinase and urease inhibitory activities of compounds from fruits of Rinorea oblongifolia C.H. Wright (Violaceae). Nat Prod Res 2023; 37:4169-4180. [PMID: 36757210 DOI: 10.1080/14786419.2023.2176491] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Accepted: 01/24/2023] [Indexed: 02/10/2023]
Abstract
From Rinorea oblongifolia fruits, 3-Nor-4β-friedelan-24-ol (1) and 3-decyl-6,7,8-trimethoxy-2H,5H-furo[4,3,2-de]isochromene-2,5-dione (4), new derivatives alongside, 28-hydroxyfriedelan-3-one (2), friedelin (3), 3,3',4,4',5'-pentamethylcoruleoellagic acid (5), hexamethylcoruleoellagic acid (6), 3',4,4',5,5'-pentamethylcoruleoellagic acid (7), and fatty compounds 8-11 were isolated and characterized using HRESIMS, EIMS, 1D and 2D NMR. In vitro enzyme inhibition of compounds 1, 2, 4, 5, 6 and 7 were evaluated on acetylcholinesterase (AChE), butyrylcholinesterase (BChE), α-glucosidase, urease and tyrosinase. Against AChE and BChE, the phenolic compounds 4, 5, 6, and 7 had good activity probably due to the phenolic nature and methoxy substituents. Compounds 4, 5, 6 and 7 exhibited good α-glucosidase inhibition especially compound 4 whose IC50 = 42.45 ± 0.46 µg/mL was close that of acarbose (IC50 = 20.52 ± 0.84 µg/mL) standard drug. Urease and tyrosinase were appreciably inhibited by the compounds. Overall results of enzyme inhibitory assays indicate Rinorea oblongifolia, fruits and its constituents as potential remedy for enzymatic disorders.
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Affiliation(s)
- Aristide Mfifen Munvera
- Department of Organic Chemistry, Faculty of Science, The University of Yaounde I, Yaounde, Cameroon
| | - Tamfu Alfred Ngenge
- Department of Chemical Engineering, School of Chemical Engineering and Mineral Industries, University of Ngaoundere, Ngaoundere, Cameroon
- Department of Medical Services and Techniques, Koycegiz Vocational School of Health Services, Mugla Sitki Kocman University, Mugla, Turkey
| | | | - Selcuk Kucukaydin
- Department of Medical Services and Techniques, Koycegiz Vocational School of Health Services, Mugla Sitki Kocman University, Mugla, Turkey
| | - Jean Noel Nyemb
- Department of Refining and Petrochemistry, National Advanced School of Mines and Petroleum Industries, University of Maroua, Kaélé, Cameroon
| | - Marcelle Aude Fokam Mafo
- Institute of Medical Research and Medicinal Plants, Ministre de la Recherche Scientifique et de l'Innovation, Yaoundé, Cameroon
| | | | - Pierre Mkounga
- Department of Organic Chemistry, Faculty of Science, The University of Yaounde I, Yaounde, Cameroon
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Ikome HN, Tamfu AN, Abdou JP, Fouotsa H, Nangmo PK, Lah FCW, Tchinda AT, Ceylan O, Frederich M, Nkengfack AE. Disruption of Biofilm Formation and Quorum Sensing in Pathogenic Bacteria by Compounds from Zanthoxylum Gilletti (De Wild) P.G. Waterman. Appl Biochem Biotechnol 2023; 195:6113-6131. [PMID: 36811771 DOI: 10.1007/s12010-023-04380-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/16/2023] [Indexed: 02/24/2023]
Abstract
Microbial resistance is facilitated by biofilm formation and quorum-sensing mediated processes. In this work, the stem bark (ZM) and fruit extracts (ZMFT) of Zanthoxylum gilletii were subjected to column chromatography and afforded lupeol (1), 2,3-epoxy-6,7-methylenedioxyconiferyl alcohol (3), nitidine chloride (4), nitidine (7), sucrose (6) and sitosterol-β-D-glucopyranoside (2). The compounds were characterized using MS and NMR spectral data. The samples were evaluated for antimicrobial, antibiofilm and anti-quorum sensing activities. Highest antimicrobial activity was exhibited by compounds 3, 4 and 7 against Staphylococcus aureus (MIC 200 µg/mL), compounds 3 and 4 against Escherichia coli (MIC = 100 µg/mL) and compounds 4 and 7 against Candida albicans (MIC = 50 µg/mL). At MIC and sub-MIC concentrations, all samples inhibited biofilm formation by pathogens and violacein production in C. violaceum CV12472 except compound 6. Good disruption of QS-sensing in C. violaceum revealed by inhibition zone diameters were exhibited by compounds 3 (11.5 ± 0.5 mm), 4 (12.5 ± 1.5 mm), 5 (15.0 ± 0.8 mm), 7 (12.0 ± 1.5 mm) as well as the crude extracts from stem barks (16.5 ± 1.2 mm) and seeds (13.0 ± 1.4 mm). The profound inhibition of quorum sensing mediated processes in test pathogens by compounds 3, 4, 5 and 7 suggests the methylenedioxy- group that these compounds possess as the possible pharmacophore.
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Affiliation(s)
- Hermia Nalova Ikome
- Department of Organic Chemistry, University of Yaounde I, P.O. Box 812, Yaoundé, Cameroon
- Laboratory of Phytochemistry, Center for Studies on Medicinal Plants and Traditional Medicine, Institute of Medical Research and Medicinal Plants Studies (IMPM), P.O. Box 13033, Yaounde, Cameroon
| | - Alfred Ngenge Tamfu
- School of Chemical Engineering and Mineral Industries, University of Ngaoundere, P.O. Box 454, Ngaoundere, Cameroon.
- Food Quality Control and Analysis Program, Ula Ali Kocman Vocational School, Mugla Sitki Kocman University, 48147, Mugla, Turkey.
| | - Jean Pierre Abdou
- Department of Chemistry, Faculty of Science, University of Ngaoundere, P.O. Box 454, Ngaondere, Cameroon
| | - Hugues Fouotsa
- Department of Organic Chemistry, University of Yaounde I, P.O. Box 812, Yaoundé, Cameroon
| | - Pamela Kemda Nangmo
- Department of Organic Chemistry, University of Yaounde I, P.O. Box 812, Yaoundé, Cameroon
- Laboratory of Phytochemistry, Center for Studies on Medicinal Plants and Traditional Medicine, Institute of Medical Research and Medicinal Plants Studies (IMPM), P.O. Box 13033, Yaounde, Cameroon
| | - Fidèle Castro Weyepe Lah
- Department of Organic Chemistry, University of Yaounde I, P.O. Box 812, Yaoundé, Cameroon
- Laboratory of Phytochemistry, Center for Studies on Medicinal Plants and Traditional Medicine, Institute of Medical Research and Medicinal Plants Studies (IMPM), P.O. Box 13033, Yaounde, Cameroon
| | - Alembert Tiabou Tchinda
- Laboratory of Phytochemistry, Center for Studies on Medicinal Plants and Traditional Medicine, Institute of Medical Research and Medicinal Plants Studies (IMPM), P.O. Box 13033, Yaounde, Cameroon.
| | - Ozgur Ceylan
- Food Quality Control and Analysis Program, Ula Ali Kocman Vocational School, Mugla Sitki Kocman University, 48147, Mugla, Turkey
| | - Michel Frederich
- Laboratory of Pharmacognosy, Center for Interdisciplinary Research on Medicine, CIRM, University of Liege, 4000, Liege, Belgium
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Talla RM, Tamfu AN, Wakeu BNK, Ceylan O, Mbazoa CD, Kapche GDWF, Lenta BN, Sewald N, Wandji J. Evaluation of anti-quorum sensing and antibiofilm effects of secondary metabolites from Gambeya lacourtiana (De Wild) Aubr. & Pellegr against selected pathogens. BMC Complement Med Ther 2023; 23:300. [PMID: 37620848 PMCID: PMC10464238 DOI: 10.1186/s12906-023-04115-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2023] [Accepted: 08/02/2023] [Indexed: 08/26/2023] Open
Abstract
BACKGROUND Microbial infections cause serious health problems especially with the rising antibiotic resistance which accounts for about 700,000 human deaths annually. Antibiotics which target bacterial death encounter microbial resistance with time, hence, there is an urgent need for the search of antimicrobial substances which target disruption of virulence factors such as biofilm and quorum sensing (QS) with selective pressure on the pathogens so as to avoid resistance. METHODS Natural products are suitable leads for antimicrobial drugs that can inhibit bacterial biofilms and QS. Twenty compounds isolated from the medicinal plant Gambeya lacourtiana were evaluated for their antibiofilm and anti-quorum sensing effects against selected pathogenic bacteria. RESULTS Most of the compounds inhibited violacein production in Chromobacterium violaceum CV12472 and the most active compound, Epicatechin had 100% inhibition at MIC (Minimal Inhibitory Concentration) and was the only compound to inhibit violacein production at MIC/8 with percentage inhibition of 17.2 ± 0.9%. Since the bacteria C. violaceum produces violacein while growing, the inhibition of the production of this pigment reflects the inhibition of signal production. Equally, some compounds inhibited violacein production by C. violaceum CV026 in the midst of an externally supplied acylhomoserine lactone, indicating that they disrupted signal molecule reception. Most of the compounds exhibited biofilm inhibition on Staphyloccocus aureus, Escherichia coli and Candida albicans and it was observed that the Gram-positive bacteria biofilm was most susceptible. The triterpenoids bearing carboxylic acid group, the ceramide and epicatechin were the most active compounds compared to others. CONCLUSION Since some of the compounds disrupted QS mediated processes in bacteria, it indicates that this plant is a source of antibiotics drugs that can reduce microbial resistance.
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Affiliation(s)
- Rostan Mangoua Talla
- Department of Organic Chemistry, Faculty of Science, The University of Yaoundé 1, P.O. Box 812, Yaoundé, Cameroon
- Department of Chemistry, Higher Teacher Training C ollege, The University of Yaoundé 1, P.O. Box 47, Yaoundé, Cameroon
| | - Alfred Ngenge Tamfu
- Department of Chemical Engineering, School of Chemical Engineering and Mineral Industries, University of Ngaoundéré, P.O. Box 454, Ngaoundéré, Cameroon.
- Food Quality Control and Analysis Program, Ula Ali Kocman Vocational School, Mugla Sitki Koc-man University, Mugla, 48147, Turkey.
| | - Brussine Nadège Kweka Wakeu
- Department of Organic Chemistry, Faculty of Science, The University of Yaoundé 1, P.O. Box 812, Yaoundé, Cameroon
| | - Ozgur Ceylan
- Food Quality Control and Analysis Program, Ula Ali Kocman Vocational School, Mugla Sitki Koc-man University, Mugla, 48147, Turkey
| | - Céline Djama Mbazoa
- Department of Organic Chemistry, Faculty of Science, The University of Yaoundé 1, P.O. Box 812, Yaoundé, Cameroon
| | | | - Bruno Ndjakou Lenta
- Department of Chemistry, Higher Teacher Training C ollege, The University of Yaoundé 1, P.O. Box 47, Yaoundé, Cameroon
| | - Norbert Sewald
- Chemistry Department, Organic and Bioorganic Chemistry, Bielefeld University, P.O. Box 100131, 33501, Bielefeld, Germany
| | - Jean Wandji
- Department of Organic Chemistry, Faculty of Science, The University of Yaoundé 1, P.O. Box 812, Yaoundé, Cameroon
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Metiefeng NT, Tamfu AN, Fotsing Tagatsing M, Tabopda TK, Kucukaydin S, Noah Mbane M, de Theodore Atchade A, Talla E, Henoumont C, Laurent S, Anouar EH, Dinica RM. In Vitro and In Silico Evaluation of Anticholinesterase and Antidiabetic Effects of Furanolabdanes and Other Constituents from Graptophyllum pictum (Linn.) Griffith. Molecules 2023; 28:4802. [PMID: 37375357 DOI: 10.3390/molecules28124802] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2023] [Revised: 06/02/2023] [Accepted: 06/14/2023] [Indexed: 06/29/2023] Open
Abstract
Graptophyllum pictum is a tropical plant noticeable for its variegated leaves and exploited for various medicinal purposes. In this study, seven compounds, including three furanolabdane diterpenoids, i.e., Hypopurin E, Hypopurin A and Hypopurin B, as well as with Lupeol, β-sitosterol 3-O-β-d-glucopyranoside, stigmasterol 3-O-β-d-glucopyranoside and a mixture of β-sitosterol and stigmasterol, were isolated from G. pictum, and their structures were deduced from ESI-TOF-MS, HR-ESI-TOF-MS, 1D and 2D NMR experiments. The compounds were evaluated for their anticholinesterase activities against acetylcholinesterase (AChE) and butyrylcholinesterase (BchE), as well as their antidiabetic potential through inhibition of α-glucosidase and α-amylase. For AChE inhibition, no sample had IC50 within tested concentrations, though the most potent was Hypopurin A, which had a percentage inhibition of 40.18 ± 0.75%, compared to 85.91 ± 0.58% for galantamine, at 100 µg/mL. BChE was more susceptible to the leaves extract (IC50 = 58.21 ± 0.65 µg/mL), stem extract (IC50 = 67.05 ± 0.82 µg/mL), Hypopurin A (IC50 = 58.00 ± 0.90 µg/mL), Hypopurin B (IC50 = 67.05 ± 0.92 µg/mL) and Hypopurin E (IC50 = 86.90 ± 0.76 µg/mL). In the antidiabetic assay, the furanolabdane diterpenoids, lupeol and the extracts had moderate to good activities. Against α-glucosidase, lupeol, Hypopurin E, Hypopurin A and Hypopurin B had appreciable activities but the leaves (IC50 = 48.90 ± 0.17 µg/mL) and stem (IC50 = 45.61 ± 0.56 µg/mL) extracts were more active than the pure compounds. In the α-amylase assay, stem extract (IC50 = 64.47 ± 0.78 µg/mL), Hypopurin A (IC50 = 60.68 ± 0.55 µg/mL) and Hypopurin B (IC50 = 69.51 ± 1.30 µg/mL) had moderate activities compared to the standard acarbose (IC50 = 32.25 ± 0.36 µg/mL). Molecular docking was performed to determine the binding modes and free binding energies of Hypopurin E, Hypopurin A and Hypopurin B in relation to the enzymes and decipher the structure-activity relationship. The results indicated that G. pictum and its compounds could, in general, be used in the development of therapies for Alzheimer's disease and diabetes.
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Affiliation(s)
- Nathalie Tanko Metiefeng
- Department of Organic Chemistry, Faculty of Science, The University of Yaounde I, Yaounde 812, Cameroon
| | - Alfred Ngenge Tamfu
- Department of Chemical Engineering, School of Chemical Engineering and Mineral Industries, University of Ngaoundere, Ngaoundere 454, Cameroon
- Department of Medical Services and Techniques, Koycegiz Vocational School of Health Services, Mugla Sitki Kocman University, Mugla 48800, Turkey
- Department of Chemistry, Physics and Environment, Faculty of Sciences and Environment, 'Dunarea de Jos' University of Galati, 47 Domneasca Str., 800008 Galati, Romania
| | - Maurice Fotsing Tagatsing
- Department of Organic Chemistry, Faculty of Science, The University of Yaounde I, Yaounde 812, Cameroon
| | - Turibio Kuiate Tabopda
- Department of Organic Chemistry, Faculty of Science, The University of Yaounde I, Yaounde 812, Cameroon
| | - Selcuk Kucukaydin
- Department of Medical Services and Techniques, Koycegiz Vocational School of Health Services, Mugla Sitki Kocman University, Mugla 48800, Turkey
| | - Martin Noah Mbane
- Department of Organic Chemistry, Faculty of Science, The University of Yaounde I, Yaounde 812, Cameroon
| | - Alex de Theodore Atchade
- Department of Organic Chemistry, Faculty of Science, The University of Yaounde I, Yaounde 812, Cameroon
| | - Emmanuel Talla
- Department of Chemical Engineering, School of Chemical Engineering and Mineral Industries, University of Ngaoundere, Ngaoundere 454, Cameroon
| | - Celine Henoumont
- Laboratory of NMR and Molecular Imaging, Department of General, Organic and Biomedical Chemistry, University of Mons, B-7000 Mons, Belgium
| | - Sophie Laurent
- Laboratory of NMR and Molecular Imaging, Department of General, Organic and Biomedical Chemistry, University of Mons, B-7000 Mons, Belgium
| | - El Hassane Anouar
- Department of Chemistry, College of Sciences and Humanities in Al-Kharj, Prince Sattam bin Abdulaziz University, Al-Kharj 11942, Saudi Arabia
| | - Rodica Mihaela Dinica
- Department of Chemistry, Physics and Environment, Faculty of Sciences and Environment, 'Dunarea de Jos' University of Galati, 47 Domneasca Str., 800008 Galati, Romania
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In Vitro Evaluation of α-amylase and α-glucosidase Inhibition of 2,3-Epoxyprocyanidin C1 and Other Constituents from Pterocarpus erinaceus Poir. MOLECULES (BASEL, SWITZERLAND) 2022; 28:molecules28010126. [PMID: 36615320 PMCID: PMC9822058 DOI: 10.3390/molecules28010126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/04/2022] [Revised: 12/21/2022] [Accepted: 12/22/2022] [Indexed: 12/29/2022]
Abstract
Diabetes mellitus is a metabolic disorder which is one of the leading causes of mortality and morbidities in elderly humans. Chronic diabetes can lead to kidney failure, blindness, limb amputation, heart attack and stroke. Physical activity, healthy diets and medications can reduce the incidence of diabetes, so the search for more efficient antidiabetic therapies, most especially from natural products, is a necessity. Herein, extract from roots of the medicinal plant Pterocarpus erinaceus was purified by column chromatography and afforded ten compounds which were characterized by EIMS, HR-FAB-MS, 1D and 2D NMR techniques. Amongst them were, a new trimeric derivative of epicatechin, named 2,3-Epoxyprocyanidin C1 (1); two pentacyclic triterpenoids, friedelin (2) and betulin (3); angolensin (4); flavonoids such as 7-methoxygenistein (5), 7-methoxydaidzein (6), apigenin 7-O-glucoronide (8) and naringenin 7-O-β-D-glucopyranoside (9); and an ellagic acid derivative (10). The extract and compounds were evaluated for their antidiabetic potential by α-amylase and α-glucosidase inhibitory assays. IC50 values of compound 7 (48.1 ± 0.9 µg/mL), compound 8 (48.6 ± 0.1 µg/mL), compound 9 (50.2 ± 0.5 µg/mL) and extract (40.5 ± 0.8 µg/mL) when compared to that of acarbose (26.4 ± 0.3 µg/mL) indicated good α-amylase inhibition. In the α-glucosidase assay, the extract (IC50 = 31.2 ± 0.1 µg/mL), compound 7 (IC50 = 39.5 ± 1.2 µg/mL), compound 8 (IC50 = 40.9 ± 1.3 µg/mL), compound 1 (IC50 = 41.6 ± 1.0 µg/mL), Compound 4 (IC50 = 43.4 ± 0.5 µg/mL), compound 5 (IC50 = 47.6 ± 0.9 µg/mL), compound 6 (IC50 = 46.3 ± 0.2 µg/mL), compound 7 (IC50 = 45.0 ± 0.8 µg/mL), compound 9 (IC50 = 44.8 ± 0.6 µg/mL) and compound 11 (IC50 = 47.5 ± 0.4 µg/mL) all had moderate-to-good inhibitions, compared to acarbose (IC50 = 22.0 ± 0.5 µg/mL). The ability to inhibit α-amylase and α-glucosidase indicates that P. erinaceus and its compounds can lower blood glucose levels by delaying hydrolysis of carbohydrates into sugars, thereby providing a source of natural antidiabetic remedy.
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Ngenge Tamfu A, Boukhedena W, Boudiba S, Deghboudj S, Ceylan O. Synthesis and evaluation of inhibitory potentials of microbial biofilms and quorum-sensing by 3-(1,3-dithian-2-ylidene) pentane-2,4-dione and ethyl-2-cyano-2-(1,3-dithian-2-ylidene) acetate. PHARMACIA 2022. [DOI: 10.3897/pharmacia.69.e87834] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
The virulence and resistance of pathogenic microorganisms are promoted by quorum-sensing (QS) mediated traits and biofilms. The development of antimicrobial agents which can reduce the incidence of microbial resistance by disrupting the establishment of biofilms and QS, constitute a suitable strategy to reduce the emergence of pathogenic strains that are resistant to antibiotics. In this study, 3-(1,3-dithian-2-ylidene) pentane-2,4-dione (1) and ethyl-2-cyano-2-(1,3-dithian-2-ylidene) acetate (2) were successfully synthesized and characterized using EIMS, 1H NMR and 13C NMR techniques. On S. aureus, both compounds had MIC (minimal inhibitory concentrations) of 0.625 mg/mL while on E. coli and C. albicans, compound 2 showed higher activity than compound 1. All compounds inhibited formation of biofilms by C. albicans and S. aureus at sub-MIC with compound 1 being more active than compound 2. On E. coli, only compound 1 inhibited biofilm formation. Violacein production of violacein in C. violaceum CV12472 and quorum sensing in C. violaceum CV026 were inhibited indicating that the compounds could block signal production and reception. Anti-quorum sensing at sub-MIC concentrations revealed by inhibition zones were 13.0±0.5 mm and 8.0±0.5 mm at MIC and MIC/2 respectively for compound 1 and for compound 2, they were 11.5±0.4 mm and 7.5±0.0 mm at MIC and MIC/2 respectively. Concentration-dependent swarming motility was exhibited by both compounds with compound 1 slightly more active than compound 2. The results indicate that the organosulphur compounds could be suitable candidates for modern antibiotics.
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