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Huang Q, Hao MJ, Wang LY, Wu F, Li HJ, Yuan J, Xu J, Mahmud T, Lan WJ. Isolation and stereospecific synthesis of indole alkaloids with lipid-lowering effects from the marine-derived fungus Colletotrichum gloeosporioides BB4. PHYTOCHEMISTRY 2023; 209:113612. [PMID: 36813220 DOI: 10.1016/j.phytochem.2023.113612] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2022] [Revised: 02/15/2023] [Accepted: 02/16/2023] [Indexed: 06/18/2023]
Abstract
Seven undescribed compounds, colletotrichindoles A-E, colletotrichaniline A, and colletotrichdiol A, as well as three known compounds, (-)-isoalternatine A, (+)-alternatine A and 3-hydroxybutan-2-yl 2-phenylacetate were isolated from the marine-derived fungus Colletotrichu gloeosporioides BB4. The racemic mixtures colletotrichindole A,colletotrichindole C, and colletotrichdiol A were further separated by chiral chromatography to give three pairs of enantiomers (10S,11R,13S)/(10R,11S,13R)-colletotrichindole A, (10R,11R,13S)/(10S,11S,13R)-colletotrichindole C, and (9S,10S)/(9R,10R)-colletotrichdiol A, respectively. The chemical structures of seven undescribed compounds and the known compounds, (-)-isoalternatine A, and (+)-alternatine A were determined using a combination of NMR, MS, X-ray diffraction, ECD calculations, and/or chemical synthesis. All possible enantiomers of colletotrichindoles A-E were synthesized and used to determine the absolute configurations of the natural products by comparing their spectroscopic data and HPLC retention times on a chiral column. In addition, the X-ray crystal structures of the known compounds (-)-isoalternatine A and (+)-alternatine A were also obtained to confirm their absolute configurations. (10S,11R,13S)-Colletotrichindole A, colletotrichindole B, and (+)-alternatine A significantly reduced triglyceride levels in 3T3-L1 cells with EC50 values of 5.8, 9.0, and 1.3 μM, respectively.
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Affiliation(s)
- Qin Huang
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, 510006, People's Republic of China; School of Pharmacy, Guangdong Pharmaceutical University, Guangzhou, 510006, People's Republic of China.
| | - Meng-Jiao Hao
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, 510006, People's Republic of China.
| | - Lai-You Wang
- School of Pharmacy, Guangdong Pharmaceutical University, Guangzhou, 510006, People's Republic of China; Department of Clinical Pharmacy, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, People's Republic of China.
| | - Feng Wu
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, 510006, People's Republic of China.
| | - Hou-Jin Li
- School of Chemistry, Sun Yat-sen University, Guangzhou, 510006, People's Republic of China.
| | - Jie Yuan
- Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, 510080, People's Republic of China.
| | - Jun Xu
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, 510006, People's Republic of China.
| | - Taifo Mahmud
- Department of Pharmaceutical Sciences, Oregon State University, Corvallis, OR, 97331, United States.
| | - Wen-Jian Lan
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, 510006, People's Republic of China.
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Screening of Aqueous Extract of Persea americana Seeds for Alpha-Glucosidase Inhibitors. Biochem Res Int 2022; 2022:3492203. [PMID: 35607491 PMCID: PMC9124114 DOI: 10.1155/2022/3492203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2022] [Accepted: 04/08/2022] [Indexed: 11/30/2022] Open
Abstract
Activity of α-glucosidase enzyme in the gastrointestinal tract has been implicated in postprandial hyperglycaemia. If not properly controlled, postprandial hyperglycaemia might progress to diabetes mellitus, a metabolic syndrome. Diabetes is associated with many complications such as retinopathy, heart attack, nephropathy, neuropathy, stroke, and lower limb amputation. Antidiabetic medications presently in use have little effect on postprandial glycaemic excursion and hence do not bring down the blood glucose level to baseline. This study extracted, fractionated, and screened the aqueous extract of Persea americana seeds for hypoglycaemic potential. Inhibitory effects of the fractions and subfractions of the extract on α-glucosidase activity were investigated. The most active subfraction was subjected to Fourier transform infrared (FTIR) and gas chromatography mass spectroscopy (GC-MS) analysis to elucidate the active components. The active subfraction showed a significant inhibition (p < 0.05) on α-glucosidase. The subfraction competitively inhibits α-glucosidase (with IC50 = 09.48 ± 0.58 μg/mL), though less potent than the standard drug, acarbose (IC50 = 06.45 ± 0.47 μg/mL). FTIR analysis of the subfraction showed the presence of carbonyl group, hydroxy group, carboxyl group, double bonds, methylene, and methyl groups. GC-MS analysis suggests the presence of cis-11,14-eicosadienoic acid, catechin, and chlorogenic acid as the active components. In conclusion, the components obtained from this study can be synthesised in the laboratory to further confirm their hypoglycaemic activity. The most active subfraction can be explored further to confirm its inhibitory activity against the enzyme and to determine its extent in the treatment of diabetes mellitus in vivo.
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Morlock GE, Heil J, Bardot V, Lenoir L, Cotte C, Dubourdeaux M. Effect-Directed Profiling of 17 Different Fortified Plant Extracts by High-Performance Thin-Layer Chromatography Combined with Six Planar Assays and High-Resolution Mass Spectrometry. Molecules 2021; 26:1468. [PMID: 33800407 PMCID: PMC7962818 DOI: 10.3390/molecules26051468] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2021] [Revised: 02/21/2021] [Accepted: 02/22/2021] [Indexed: 12/11/2022] Open
Abstract
An effect-directed profiling method was developed to investigate 17 different fortified plant extracts for potential benefits. Six planar effect-directed assays were piezoelectrically sprayed on the samples separated side-by-side by high-performance thin-layer chromatography. Multipotent compounds with antibacterial, α-glucosidase, β-glucosidase, AChE, tyrosinase and/or β-glucuronidase-inhibiting effects were detected in most fortified plant extracts. A comparatively high level of antimicrobial activity was observed for Eleutherococcus, hops, grape pomace, passiflora, rosemary and Eschscholzia. Except in red vine, black radish and horse tail, strong enzyme inhibiting compounds were also detected. Most plants with anti-α-glucosidase activity also inhibited β-glucosidase. Green tea, lemon balm and rosemary were identified as multipotent plants. Their multipotent compound zones were characterized by high-resolution mass spectrometry to be catechins, rosmarinic acid, chlorogenic acid and gallic acid. The results pointed to antibacterial and enzymatic effects that were not yet known for plants such as Eleutherococcus and for compounds such as cynaratriol and caffeine. The nontarget effect-directed profiling with multi-imaging is of high benefit for routine inspections, as it provides comprehensive information on the quality and safety of the plant extracts with respect to the global production chain. In this study, it not only confirmed what was expected, but also identified multipotent plants and compounds, and revealed new bioactivity effects.
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Affiliation(s)
- Gertrud E. Morlock
- TransMIT Center for Effect-Directed Analysis, and Chair of Food Science, Institute of Nutritional Science, Justus Liebig University Giessen, Heinrich-Buff-Ring 26–32, 35392 Giessen, Germany;
| | - Julia Heil
- TransMIT Center for Effect-Directed Analysis, and Chair of Food Science, Institute of Nutritional Science, Justus Liebig University Giessen, Heinrich-Buff-Ring 26–32, 35392 Giessen, Germany;
| | - Valérie Bardot
- PiLeJe Industrie, Naturopôle Nutrition Santé, Les Tiolans, 03800 Saint-Bonnet-de-Rochefort, France; (V.B.); (L.L.); (C.C.); (M.D.)
| | - Loïc Lenoir
- PiLeJe Industrie, Naturopôle Nutrition Santé, Les Tiolans, 03800 Saint-Bonnet-de-Rochefort, France; (V.B.); (L.L.); (C.C.); (M.D.)
| | - César Cotte
- PiLeJe Industrie, Naturopôle Nutrition Santé, Les Tiolans, 03800 Saint-Bonnet-de-Rochefort, France; (V.B.); (L.L.); (C.C.); (M.D.)
| | - Michel Dubourdeaux
- PiLeJe Industrie, Naturopôle Nutrition Santé, Les Tiolans, 03800 Saint-Bonnet-de-Rochefort, France; (V.B.); (L.L.); (C.C.); (M.D.)
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Kim JW, Shim SH. The fungus Colletotrichum as a source for bioactive secondary metabolites. Arch Pharm Res 2019; 42:735-753. [PMID: 30915681 DOI: 10.1007/s12272-019-01142-z] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2018] [Accepted: 03/07/2019] [Indexed: 12/30/2022]
Abstract
Colletotrichum sp. is a widely distributed fungal genus, which is mainly known to cause anthracnose on cereals, legumes, fruit trees, and vegetables. Even though many of the Colletotrichum sp. are plant pathogens, a variety of secondary metabolites with diverse bioactivities have been reported to be produced by this fungus. At least 109 secondary metabolites from the fungus Colletotrichum have been reported to date. They mostly include nitrogen-containing metabolites, sterols, terpenes, pyrones, phenolics, and fatty acids. Herein, the authors review the structurally interesting secondary metabolites produced by Colletotrichum and their biological activities.
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Affiliation(s)
- Jung Wha Kim
- College of Pharmacy and Innovative Drug Center, Duksung Women's University, Seoul, 01369, Republic of Korea
| | - Sang Hee Shim
- College of Pharmacy and Innovative Drug Center, Duksung Women's University, Seoul, 01369, Republic of Korea.
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