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Saikia L, Bhattacharyya J, Sen S, Dutta PP. A Review on Ethnobotany, Phytochemistry and Pharmacological Activities of Euphorbia antiquorum L. Chem Biodivers 2024; 21:e202400331. [PMID: 38578839 DOI: 10.1002/cbdv.202400331] [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: 02/07/2024] [Revised: 03/27/2024] [Accepted: 04/05/2024] [Indexed: 04/07/2024]
Abstract
Euphorbia antiquorum L. is a small plant in the Euphorbiaceae family that is found primarily in tropical and subtropical Asia. It has a long tradition of being utilized in Chinese, Ayurvedic, and other traditional systems for a variety of ailments. To date, More than 116 bioactive constituents were isolated from Euphorbia antiquorum, with diterpenoids being the most abundant. Extracts and isolated chemicals from various portions of the plant have demonstrated significant pharmacological activities such as anti-inflammatory, analgesic, antidiabetic, anticancer etc. It is necessary to conduct an in-depth investigation of the phytochemicals along with the pharmacological properties of E. antiquorum. This review summarised the knowledge of ethnobotany, phytochemistry and pharmacological activities of the plant which will provide a better understanding to clarify the traditional uses of the species and its relation to modern pharmacology which will ultimately pave the way for its clinical application.
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Affiliation(s)
- Lunasmrita Saikia
- Faculty of Pharmaceutical Science, Assam down town University, Panikhaiti, Guwahati, 781026, Assam, India
| | - Jyotirmoy Bhattacharyya
- Faculty of Pharmaceutical Science, Assam down town University, Panikhaiti, Guwahati, 781026, Assam, India
| | - Saikat Sen
- Faculty of Pharmaceutical Science, Assam down town University, Panikhaiti, Guwahati, 781026, Assam, India
| | - Partha Pratim Dutta
- Faculty of Pharmaceutical Science, Assam down town University, Panikhaiti, Guwahati, 781026, Assam, India
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Nguyen NKV, Tran HDT, Duong TH, Pham NKT, Nguyen TQT, Nguyen TNT, Chavasiri W, Nguyen NH, Nguyen HT. Bio-guided isolation of alpha-glucosidase inhibitory compounds from Vietnamese liverwort Marchantia polymorpha: in vitro and in silico studies. RSC Adv 2023; 13:35481-35492. [PMID: 38058554 PMCID: PMC10697071 DOI: 10.1039/d3ra07503f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2023] [Accepted: 11/27/2023] [Indexed: 12/08/2023] Open
Abstract
Bio-guided isolation was applied to Vietnamese Marchantia polymorpha L. to find alpha-glucosidase inhibition. Fifteen compounds were isolated and structurally determined, including two new compounds, marchatoside (7) and marchanol (8), along with thirteen known compounds: marchantin A (1), isoriccardin C (2), riccardin C (3), marchantin K (4), lunularin (5), 3R-(3,4-dimethoxybenzyl)-5,7-dimethoxyphthalide (6), vitexilactone (9), 12-oleanene-3-one (10), 3,11-dioxoursolic acid (11), ursolic acid (12), artemetin (13), kaempferol (14), and quercetin (15). The structures of these compounds were determined through extensive spectroscopic analyses (1D and 2D NMR, HRESIMS, and ECD) and by comparisons to the existing literature. There are five types of carbon skeleton, including bibenzyl (1-5), 3-benzylphthalide (6 and 7), diterpenoid (8 and 9), triterpenoid (10-12), and flavonoid (13-15). Compounds 6-12 were reported for the first time within the genus Marchantia. Compounds 1-12 were evaluated for their alpha-glucosidase inhibition. Among them, 1-5 and 10-12 displayed potent inhibition, with IC50 values ranging from 28.9 to 130.6 μM, compared to the positive control acarbose 330.9 μM. A kinetic study and molecular docking were also performed to understand the mechanism.
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Affiliation(s)
- Ngoc Khanh Van Nguyen
- Faculty of Natural Sciences Pedagogy, Sai Gon University 273 An Duong Vuong, Ward 3, District 5 Ho Chi Minh City 70000 Vietnam
| | - Ho-Duc-Trung Tran
- Department of Chemistry, Ho Chi Minh City University of Education 280 An Duong Vuong Street, District 5 Ho Chi Minh City 748342 Vietnam
| | - Thuc-Huy Duong
- Department of Chemistry, Ho Chi Minh City University of Education 280 An Duong Vuong Street, District 5 Ho Chi Minh City 748342 Vietnam
| | - Nguyen Kim Tuyen Pham
- Faculty of Environment, Sai Gon University 273 An Duong Vuong, Ward 3, District 5 Ho Chi Minh City 70000 Vietnam
| | - Thi Quynh Trang Nguyen
- Faculty of Environment, Sai Gon University 273 An Duong Vuong, Ward 3, District 5 Ho Chi Minh City 70000 Vietnam
| | - Thi Ngoc Thao Nguyen
- Faculty of Environment, Sai Gon University 273 An Duong Vuong, Ward 3, District 5 Ho Chi Minh City 70000 Vietnam
| | - Warinthorn Chavasiri
- Center of Excellence in Natural Products Chemistry, Department of Chemistry, Faculty of Science, Chulalongkorn University Pathumwan Bangkok 10330 Thailand
- Nanotec-CU Center of Excellence on Food and Agriculture, Department of Chemistry, Faculty of Science, Chulalongkorn University Bangkok 10330 Thailand
| | - Ngoc-Hong Nguyen
- CirTech Institute, HUTECH University 475 A Dien Bien Phu Street, Binh Thanh District Ho Chi Minh City Vietnam
| | - Huu Tri Nguyen
- Faculty of Natural Sciences Pedagogy, Sai Gon University 273 An Duong Vuong, Ward 3, District 5 Ho Chi Minh City 70000 Vietnam
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Nguyen THT, To HL, Nguyen TD, Nguyen TBT, Pham NKT, Nguyen HT, Nguyen CH, Nguyen HH, Nguyen NH, Duong TH. Tecomastane, a new megastigmane from the flowers of Tecoma stans. Nat Prod Res 2023; 37:3563-3571. [PMID: 35749654 DOI: 10.1080/14786419.2022.2092735] [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: 03/03/2022] [Revised: 06/04/2022] [Accepted: 06/11/2022] [Indexed: 10/17/2022]
Abstract
Tecoma stans is a tropical plant that is widely used in folk medicine. Little is known about the chemical constituents of flowers of this plant. From flowers of the native plant in Vietnam, 12 compounds were isolated and elucidated, including one new compound tecomastane (1) and eleven known compounds, (3S,5R,6S,7E)-5,6-epoxy-3-hydroxy-7-megastigmane-9-one (2), bosciallin (3), chakyunglupulin B (4), (2S,6R)-2,6-dimethyloctane-1,8-diol (5), cleroindicin F (6), rengyoxide (7), 3,4-dihydroxybenzoic acid (8), methyl 3,4-dihydrobenzoate (9), 3,5-dihydroxybenzoic acid (10), luteolin (11), and indole-3-carboxylic acid (12). Compound 5 was a new natural product. The chemical structures of isolated compounds were identified by interpretation of their spectroscopic data (1D, 2D NMR, and HRESIMS) and by comparison with the literature. Compounds 1-7 and 10-12 were evaluated for alpha-glucosidase inhibition and antimicrobial activity against antibiotic-resistant, pathogenic bacteria Enterococcus faecium, Staphylococcus aureus, and Acinetobacter baumannii.
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Affiliation(s)
- Thi-Hoai-Thu Nguyen
- Faculty of Basic Sciences, University of Medicine and Pharmacy at Ho Chi Minh City, Ho Chi Minh City, Vietnam
| | - Hoang-Long To
- Department of Chemistry, University of Education, Ho Chi Minh City, Vietnam
| | - Tuan-Dat Nguyen
- Department of Chemistry, University of Education, Ho Chi Minh City, Vietnam
| | - Thi-Bao-Tran Nguyen
- Faculty of Environmental Science, Sai Gon University, Ho Chi Minh City, Vietnam
| | | | - Huy Truong Nguyen
- Faculty of Pharmacy, Ton Duc Thang University, Ho Chi Minh City, Vietnam
| | - Chuong Hoang Nguyen
- University of Science, Vietnam National University Ho Chi Minh City, Ho Chi Minh City, Vietnam
| | - Huu-Hung Nguyen
- Faculty of Applied Technology, School of Engineering and Technology, Van Lang University, Ho Chi Minh City, Vietnam
| | | | - Thuc-Huy Duong
- Department of Chemistry, University of Education, Ho Chi Minh City, Vietnam
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Nguyen NH, Tran NMA, Duong TH, Vo GV. α-Glucosidase inhibitory activities of flavonoid derivatives isolated from Bouea macrophylla: in vitro and in silico studies. RSC Adv 2023; 13:8190-8201. [PMID: 36922943 PMCID: PMC10009879 DOI: 10.1039/d3ra00650f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Accepted: 02/24/2023] [Indexed: 03/14/2023] Open
Abstract
In continuation of our search for bioactive compounds from the Bouea macrophylla (B. macrophylla) plant, we describe herein eight flavonoid-type compounds including mearsetin (1), mearnsitrin (2), kampferol (3), afzelin (4), quercetin (5), quercitrin (6), myricitin (7), and naringenin (8) with the aim of investigating their antidiabetic properties. Compounds 3 and 5 were selected for aromatic bromination to provide two new products 3a and 5a, respectively. All compounds showed promising α-glucosidase inhibition, with IC50 values ranging from 9.2 to 266 μM apart from compound (2). Remarkably, compound 5a, 8-bromoquercetin, showed the highest inhibition activity, and it was thirty-seven times better than the standard drug acarbose. Pose 261/compound 5a interacted well with enzyme 3TOPin silico docking, and the complex of pose 261 and target enzyme proved its stability in MD. Compound 5a, pose 261 was predicted to be safe and seemed to have good absorption, distribution, metabolism, and excretion properties as assessed via the ADMET model in silico. Our findings revealed the α-glucosidase inhibitory potential of the flavonoids isolated from the leaves of B. macrophylla with a predictive pharmacokinetics profile, which may be helpful in their development as potential drugs.
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Affiliation(s)
- Ngoc-Hong Nguyen
- CirTech Institute, HUTECH University 475 A Dien Bien Phu Street, Binh Thanh District Ho Chi Minh City Vietnam
| | - Nguyen-Minh-An Tran
- Faculty of Chemical Engineering, Industrial University of Ho Chi Minh City 12 Nguyen Van Bao Street, Ward 4, Go Vap District Ho Chi Minh City 70000 Vietnam
| | - Thuc-Huy Duong
- Department of Chemistry, Ho Chi Minh City University of Education Ho Chi Minh City 700000 Vietnam
| | - Giau Van Vo
- Department of Biomedical Engineering, School of Medicine, Vietnam National University - Ho Chi Minh City (VNU-HCM) Ho Chi Minh City 700000 Vietnam .,Research Center for Genetics and Reproductive Health (CGRH), School of Medicine, Vietnam National University - Ho Chi Minh City (VNU-HCM) Ho Chi Minh City 70000 Vietnam.,Vietnam National University Ho Chi Minh City (VNU-HCM) Ho Chi Minh City 700000 Vietnam
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Tretyakova E, Smirnova I, Kazakova O, Nguyen HTT, Shevchenko A, Sokolova E, Babkov D, Spasov A. New Molecules of Diterpene Origin with Inhibitory Properties toward α-Glucosidase. Int J Mol Sci 2022; 23:13535. [PMID: 36362322 PMCID: PMC9655717 DOI: 10.3390/ijms232113535] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2022] [Revised: 11/01/2022] [Accepted: 11/01/2022] [Indexed: 10/10/2023] Open
Abstract
The incidence of diabetes mellitus (DM), one of the most common chronic metabolic disorders, has increased dramatically over the past decade and has resulted in higher rates of morbidity and mortality worldwide. The enzyme, α-Glucosidase (α-GLy), is considered a therapeutic target for the treatment of type 2 DM. Herein, we synthesized arylidene, heterocyclic, cyanoetoxy- and propargylated derivatives of quinopimaric acid (levopimaric acid diene adduct with p-benzoquinone) 1-50 and, first, evaluated their ability to inhibit α-GLy. Among the tested compounds, quinopimaric acid 1, 2,3-dihydroquinopimaric acid 8 and its amide and heterocyclic derivatives 9, 30, 33, 39, 44, with IC50 values of 35.57-65.98 μM, emerged as being good inhibitors of α-GLy. Arylidene 1β-hydroxy and 1β,13α-epoxy methyl dihydroquinopimarate derivatives 6, 7, 26-29, thiadiazole 32, 1a,4a-dehydroquinopimaric acid 40 and its indole, nitrile and propargyl hybrids 35-38, 42, 45, 48, and 50 showed excellent inhibitory activities. The most active compounds 38, 45, 48, and 50 displayed IC50 values of 0.15 to 0.68 μM, being 1206 to 266 more active than acarbose (IC50 of 181.02 μM). Kinetic analysis revealed the most active diterpene indole with an alkyne substituent 45 as a competitive inhibitor with Ki of 50.45 μM. Molecular modeling supported this finding and suggested that the indole core plays a key role in the binding. Compound 45 also has favorable pharmacokinetic and safety properties, according to the computational ADMET profiling. The results suggested that quinopimaric acid derivatives should be considered as potential candidates for novel alternative therapies in the treatment of type 2 diabetes.
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Affiliation(s)
- Elena Tretyakova
- Ufa Institute of Chemistry, Ufa Federal Research Centre, Russian Academy of Sciences, 71 Prospect Oktyabrya, 450054 Ufa, Russia
| | - Irina Smirnova
- Ufa Institute of Chemistry, Ufa Federal Research Centre, Russian Academy of Sciences, 71 Prospect Oktyabrya, 450054 Ufa, Russia
| | - Oxana Kazakova
- Ufa Institute of Chemistry, Ufa Federal Research Centre, Russian Academy of Sciences, 71 Prospect Oktyabrya, 450054 Ufa, Russia
| | - Ha Thi Thu Nguyen
- Institute of Chemistry, Vietnamese Academy of Science and Technology, 18 Hoang Quoc Viet Str., Cau Giay Dist., Hanoi 100000, Vietnam
| | - Alina Shevchenko
- Scientific Center for Innovative Drugs, Volgograd State Medical University, Novorossiyskaya Str. 39, 400087 Volgograd, Russia
| | - Elena Sokolova
- Scientific Center for Innovative Drugs, Volgograd State Medical University, Novorossiyskaya Str. 39, 400087 Volgograd, Russia
| | - Denis Babkov
- Scientific Center for Innovative Drugs, Volgograd State Medical University, Novorossiyskaya Str. 39, 400087 Volgograd, Russia
| | - Alexander Spasov
- Scientific Center for Innovative Drugs, Volgograd State Medical University, Novorossiyskaya Str. 39, 400087 Volgograd, Russia
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Kashtoh H, Baek KH. Recent Updates on Phytoconstituent Alpha-Glucosidase Inhibitors: An Approach towards the Treatment of Type Two Diabetes. PLANTS (BASEL, SWITZERLAND) 2022; 11:plants11202722. [PMID: 36297746 PMCID: PMC9612090 DOI: 10.3390/plants11202722] [Citation(s) in RCA: 32] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2022] [Revised: 10/07/2022] [Accepted: 10/11/2022] [Indexed: 06/01/2023]
Abstract
Diabetes is a common metabolic disorder marked by unusually high plasma glucose levels, which can lead to serious consequences such as retinopathy, diabetic neuropathy and cardiovascular disease. One of the most efficient ways to reduce postprandial hyperglycemia (PPHG) in diabetes mellitus, especially insulin-independent diabetes mellitus, is to lower the amount of glucose that is absorbed by inhibiting carbohydrate hydrolyzing enzymes in the digestive system, such as α-glucosidase and α-amylase. α-Glucosidase is a crucial enzyme that catalyzes the final stage of carbohydrate digestion. As a result, α-glucosidase inhibitors can slow D-glucose release from complex carbohydrates and delay glucose absorption, resulting in lower postprandial plasma glucose levels and control of PPHG. Many attempts have been made in recent years to uncover efficient α-glucosidase inhibitors from natural sources to build a physiologic functional diet or lead compound for diabetes treatment. Many phytoconstituent α-glucosidase inhibitors have been identified from plants, including alkaloids, flavonoids, anthocyanins, terpenoids, phenolic compounds, glycosides and others. The current review focuses on the most recent updates on different traditional/medicinal plant extracts and isolated compounds' biological activity that can help in the development of potent therapeutic medications with greater efficacy and safety for the treatment of type 2 diabetes or to avoid PPHG. For this purpose, we provide a summary of the latest scientific literature findings on plant extracts as well as plant-derived bioactive compounds as potential α-glucosidase inhibitors with hypoglycemic effects. Moreover, the review elucidates structural insights of the key drug target, α-glucosidase enzymes, and its interaction with different inhibitors.
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Zhan ZJ, Li S, Chu W, Yin S. Euphorbia diterpenoids: isolation, structure, bioactivity, biosynthesis, and synthesis (2013-2021). Nat Prod Rep 2022; 39:2132-2174. [PMID: 36111621 DOI: 10.1039/d2np00047d] [Citation(s) in RCA: 32] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Covering: 2013 to 2021As the characteristic metabolites of Euphorbia plants, Euphorbia diterpenoids have always been a hot topic in related science communities due to their intriguing structures and broad bioactivities. In this review, we intent to provide an in-depth and extensive coverage of Euphorbia diterpenoids reported from 2013 to the end of 2021, including 997 new Euphorbia diterpenoids and 78 known ones with latest progress. Multiple aspects will be summarized, including their occurrences, chemical structures, bioactivities, and syntheses, in which the structure-activity relationship and biosynthesis of this class will be discussed for the first time.
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Affiliation(s)
- Zha-Jun Zhan
- College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou, P. R. China
| | - Shen Li
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510006, P. R. China.
| | - Wang Chu
- College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou, P. R. China
| | - Sheng Yin
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510006, P. R. China.
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Nguyen HH, Duong TH, Nguyen TVA, Do TH, Pham DD, Nguyen NH, Nguyen HT. α-Glucosidase inhibitory derivatives of protocetraric acid. Nat Prod Res 2022; 37:1935-1946. [DOI: 10.1080/14786419.2022.2110093] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
Affiliation(s)
- Huu-Hung Nguyen
- Faculty of Applied Technology, School of Engineering and Technology, Van Lang University, Ho Chi Minh City, Vietnam
| | - Thuc-Huy Duong
- Department of Chemistry, Ho Chi Minh City University of Education, Ho Chi Minh City, Viet Nam
| | | | - Thanh-Hung Do
- NTT Hi-Tech Institute, Nguyen Tat Thanh University, Ho Chi Minh City, Vietnam
| | - Duc-Dung Pham
- Department of Chemistry, Ho Chi Minh City University of Education, Ho Chi Minh City, Viet Nam
| | | | - Huy Truong Nguyen
- Faculty of Pharmacy, Ton Duc Thang University, Ho Chi Minh City, Vietnam
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Nguyen HH, Tran NMA, Nguyen THT, Vo HC, Nguyen CH, Nguyen THA, Nguyen NH, Duong TH. Rotenoids and coumaronochromonoids from Boerhavia erecta and their biological activities: in vitro and in silico studies. JOURNAL OF SAUDI CHEMICAL SOCIETY 2022. [DOI: 10.1016/j.jscs.2022.101489] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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α-Glucosidase Inhibitory and Antimicrobial Benzoylphloroglucinols from Garcinia schomburgakiana Fruits: In Vitro and In Silico Studies. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27082574. [PMID: 35458771 PMCID: PMC9032663 DOI: 10.3390/molecules27082574] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Revised: 04/11/2022] [Accepted: 04/13/2022] [Indexed: 11/17/2022]
Abstract
α-Glucosidase plays a role in hydrolyzing complex carbohydrates into glucose, which is easily absorbed, causing postprandial hyperglycemia. Inhibition of α-glucosidase is therefore an ideal approach to preventing this condition. A novel polyprenylated benzoylphloroglucinol, which we named schomburgkianone I (1), was isolated from the fruit of Garcinia schomburgkiana, along with an already-reported compound, guttiferone K (2). The structures of the two compounds were determined using NMR and HRESIMS analysis, and comparisons were made with previous studies. Compounds 1 and 2 exhibited potent α-glucosidase inhibition (IC50s of 21.2 and 34.8 µM, respectively), outperforming the acarbose positive control. Compound 1 produced wide zones of inhibition against Staphylococcus aureus and Enterococcus faecium (of 21 and 20 mm, respectively), compared with the 19 and 20 mm zones of compound 2, at a concentration of 50 µg/mL. The MIC value of compound 1 against S. aureus was 13.32 µM. An in silico molecular docking model suggested that both compounds are potent inhibitors of enzyme α-glucosidase and are therefore leading candidates as therapies for diabetes mellitus.
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Ha KN, Nguyen TVA, Mai DT, Tran NMA, Nguyen NH, Vo GV, Duong TH, Truong Nguyen H. Alpha-glucosidase inhibitors from Nervilia concolor, Tecoma stans, and Bouea macrophylla. Saudi J Biol Sci 2022; 29:1029-1042. [PMID: 35197772 PMCID: PMC8848031 DOI: 10.1016/j.sjbs.2021.09.070] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2021] [Revised: 09/18/2021] [Accepted: 09/25/2021] [Indexed: 12/18/2022] Open
Abstract
Tecoma stans (L.) Juss. Ex Kunth is widely used in folk medicine. In ethnomedicine, it is applied as a cardioprotective, hepatoprotective, antiarthritic, antinociceptive, anti-inflammatory, and antimicrobial. The aqueous extract is considered antidiabetic, and is used as a traditional remedy in Mexico. More than 120 chemical constituents have been identified in its leaves, barks, and roots. However, less is known about the phytochemical properties of T. stans flower extracts. The herbal plant Nervilia concolor (Blume) Schltr. is native to Vietnam, and is used in traditional Chinese medicine to treat diseases such as bronchitis, stomatitis, acute pneumonia, and laryngitis. Only two previous reports have addressed the chemical content of this plant. Bouea macrophylla Griff., commonly known as marian plum or plum mango, is a tropical plant that is used to treat a range of illnesses. Phytochemical analysis of B. macrophylla suggests the presence of volatile components and flavonoids. However, existing data have been obtained from screening without isolation. As part of our ongoing search for alpha-glucosidase inhibitors from Vietnamese medicinal plants, we conducted bioactive-guided isolation of the whole plant N. concolor, the flowers of T. stans, and the leaves of B. macrophylla. We isolated and structurally elucidated five known compounds from T. stans: ursolic acid (TS1), 3-oxours-12-en-28-oic acid (TS2), chrysoeriol (TS3), ferulic acid (TS4), and tecomine (TS5). Three known compounds were isolated from Nervilia concolor: astragalin (NC1), isoquercitrin (NC2), and caffeic acid (NC3). From B. macrophylla, betullinic acid (BM1), methyl gallate (BM2), and 3-O-galloyl gallic acid methyl ester (BM3) were isolated. All compounds showed promising alpha-glucosidase inhibition, with IC50 values ranging from 1.4 to 143.3 µM. The kinetics of enzyme inhibition showed BM3 to be a competitive-type inhibitor. An in silico molecular docking model confirmed that compounds NC1, NC2, and BM3 were potential inhibitors of the α-glucosidase enzyme. Molecular dynamics simulations were carried out with compound BM3 demonstrating the best docking model during simulation up to 100 ns to explore the stability of the complex ligand–protein.
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Affiliation(s)
- Kim-Ngoc Ha
- CirTech Institute, Ho Chi Minh City University of Technology (HUTECH), 475 A Dien Bien Phu Street, Binh Thanh District, Ho Chi Minh City 700000, Viet Nam
| | - Tran-Van-Anh Nguyen
- Faculty of Pharmacy, Ton Duc Thang University, Ho Chi Minh City 700000, Viet Nam
| | - Dinh-Tri Mai
- Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Ha Noi 11355, Viet Nam
- Institute of Chemical Technology, Vietnam Academy of Science and Technology, 01 Mac Dinh Chi, Ho Chi Minh City 71007, Viet Nam
| | - Nguyen-Minh-An Tran
- Faculty of Chemical Engineering, Industrial University of Ho Chi Minh City, Ho Chi Minh City 71420, Viet Nam
| | - Ngoc-Hong Nguyen
- CirTech Institute, Ho Chi Minh City University of Technology (HUTECH), 475 A Dien Bien Phu Street, Binh Thanh District, Ho Chi Minh City 700000, Viet Nam
| | - Giau Van Vo
- Department of Biomedical Engineering, School of Medicine, Vietnam National University – Ho Chi Minh City (VNU-HCM), Ho Chi Minh City, Viet Nam
- Vietnam National University – Ho Chi Minh City (VNU-HCM), Ho Chi Minh City 700000, Viet Nam
| | - Thuc-Huy Duong
- Department of Chemistry, University of Education, 280 An Duong Vuong Street, District 5, Ho Chi Minh City 72711, Viet Nam
- Corresponding authors at: Department of Chemistry, Ho Chi Minh City University of Education, 280 An Duong Vuong Street, District 5, 748342 Ho Chi Minh City, Viet Nam (T.-H. Duong). Faculty of Pharmacy, Ton Duc Thang University, Ho Chi Minh City 700000, Viet Nam (H. T. Nguyen).
| | - Huy Truong Nguyen
- Faculty of Pharmacy, Ton Duc Thang University, Ho Chi Minh City 700000, Viet Nam
- Corresponding authors at: Department of Chemistry, Ho Chi Minh City University of Education, 280 An Duong Vuong Street, District 5, 748342 Ho Chi Minh City, Viet Nam (T.-H. Duong). Faculty of Pharmacy, Ton Duc Thang University, Ho Chi Minh City 700000, Viet Nam (H. T. Nguyen).
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Flavones from Combretum quadrangulare Growing in Vietnam and Their Alpha-Glucosidase Inhibitory Activity. Molecules 2021; 26:molecules26092531. [PMID: 33926133 PMCID: PMC8123651 DOI: 10.3390/molecules26092531] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2021] [Revised: 04/20/2021] [Accepted: 04/23/2021] [Indexed: 11/28/2022] Open
Abstract
Combretum quadrangulare Kurz is widely used in folk medicine in Eastern Asia and is associated with various ethnopharmacological properties including hepatoprotective, antipyretic, analgesic, antidysenteric, and anthelmintic activities. Previous phytochemical investigations reported the presence of numerous triterpenes (mostly cycloartanes, ursanes, lupanes, and oleananes) along with dozens of flavonoids. However, the extracts of C. quadrangulare and isolated flavonoids have not been evaluated for their alpha-glucosidase inhibition. In the frame of our efforts dedicated to the chemical investigation of Vietnamese medicinal plants and their biological activities, a phytochemical study of the MeOH extract of the leaves of C. quadrangulare using bioactive guided isolation was undertaken. In this paper, the isolation and structure elucidation of twelve known compounds, 5-hydroxy-3,7,4′-trimethoxyflavone (1), ayanin (2), kumatakenin (3), rhamnocitrin (4), ombuin (5), myricetin-3,7,3′,5′-tetramethyl ether (6), gardenin D (7), luteolin (12), apigenin (13), mearnsetin (14), isoorientin (15), and vitexin (16) were reported. Bromination was applied to compounds 2 and 3 to provide four new synthetic analogues 8–11. All isolated and synthesized compounds were evaluated for alpha-glucosidase inhibition and antibacterial activity. Compounds 4 and 5 showed moderate antibacterial activity against methicillin-resistant Staphylococcus aureus while others were inactive. All compounds failed to reveal any activity toward extended spectrum beta-lactamase-producing Escherichia coli. Compounds 2, 4, 6–9, and 11–14 showed good alpha-glucosidase inhibition with IC50 values in the range of 30.5–282.0 µM. The kinetic of enzyme inhibition showed that 8 and 11 were noncompetitive type inhibition against alpha-glucosidase. In silico molecular docking model indicated that compounds 8 and 11 were potential inhibitors against enzyme α-glucosidase.
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