1
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Dang PH, Tran TH, Le TH, Do TNV, Nguyen HX, Nguyen MTT, Nguyen NT. A new β-carboline-type alkaloid from the flowers of Calotropis gigantea (L.) W.T.Aiton. Nat Prod Res 2023:1-9. [PMID: 37129020 DOI: 10.1080/14786419.2023.2208259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
In our antioxidant screening of some Vietnamese plant extracts, the CHCl3-soluble fraction from Calotropis gigantea (L.) W.T.Aiton flowers showed moderate DPPH free radical scavenging activity with an IC50 value of 55.8 μg/mL. Thus, a further phytochemical study was carried out to obtain five alkaloids, including a new β-carboline-type alkaloid, caloside H (1). These known compounds were identified as 5-hydroxy-(2-methoxymethyl)pyridine (2), nicotinic acid (3), p-(acetylamino)phenol (4), and thymine (5). These structures were determined based on the NMR spectroscopic analysis. In antioxidant assay, caloside H at concentration of 100 μM showed DPPH radical scavenging capacity with a percentage of inhibition of 40.2%. In addition, a plausible biosynthetic pathway for the formation of caloside H was proposed based on the Schiff base formation and Mannich-like reaction.
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Affiliation(s)
- Phu H Dang
- Faculty of Chemistry, University of Science, Ho Chi Minh City, Vietnam
- Vietnam National University, Ho Chi Minh City, Vietnam
- Research Lab for Drug Discovery and Development, University of Science, Ho Chi Minh City, Vietnam
| | - Tu H Tran
- Faculty of Chemistry, University of Science, Ho Chi Minh City, Vietnam
- Vietnam National University, Ho Chi Minh City, Vietnam
- Research Lab for Drug Discovery and Development, University of Science, Ho Chi Minh City, Vietnam
| | - Tho H Le
- Faculty of Chemistry, University of Science, Ho Chi Minh City, Vietnam
- Vietnam National University, Ho Chi Minh City, Vietnam
- Research Lab for Drug Discovery and Development, University of Science, Ho Chi Minh City, Vietnam
| | - Truong N V Do
- Faculty of Chemistry, University of Science, Ho Chi Minh City, Vietnam
- Vietnam National University, Ho Chi Minh City, Vietnam
- Research Lab for Drug Discovery and Development, University of Science, Ho Chi Minh City, Vietnam
| | - Hai X Nguyen
- Faculty of Chemistry, University of Science, Ho Chi Minh City, Vietnam
- Vietnam National University, Ho Chi Minh City, Vietnam
- Research Lab for Drug Discovery and Development, University of Science, Ho Chi Minh City, Vietnam
| | - Mai T T Nguyen
- Faculty of Chemistry, University of Science, Ho Chi Minh City, Vietnam
- Vietnam National University, Ho Chi Minh City, Vietnam
- Research Lab for Drug Discovery and Development, University of Science, Ho Chi Minh City, Vietnam
| | - Nhan T Nguyen
- Faculty of Chemistry, University of Science, Ho Chi Minh City, Vietnam
- Vietnam National University, Ho Chi Minh City, Vietnam
- Research Lab for Drug Discovery and Development, University of Science, Ho Chi Minh City, Vietnam
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2
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Abstract
Bioactivity-guided isolation of the CHCl3-soluble fraction of the stems of Salacia chinensis L. (Celastraceae) was carried out to obtain a new 7',9-epoxylignan (1) and three 7,9':7',9-diepoxylignans (2-4). The absolute configuration of 1 was elucidated based on NMR and ECD spectroscopic data interpretation. All isolated lignans showed intermediate α-glucosidase inhibitory activity with the IC50 values ranging from 28.5 to 85.6 µM.
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Affiliation(s)
- Nhan T Nguyen
- Faculty of Chemistry, University of Science, Ho Chi Minh City, Vietnam.,Vietnam National University, Ho Chi Minh City, Vietnam.,Cancer Research Laboratory, University of Science, Ho Chi Minh City, Vietnam
| | - Truc T T Duong
- Faculty of Chemistry, University of Science, Ho Chi Minh City, Vietnam.,Vietnam National University, Ho Chi Minh City, Vietnam
| | - Phu H Dang
- Faculty of Chemistry, University of Science, Ho Chi Minh City, Vietnam.,Vietnam National University, Ho Chi Minh City, Vietnam
| | - Hai X Nguyen
- Faculty of Chemistry, University of Science, Ho Chi Minh City, Vietnam.,Vietnam National University, Ho Chi Minh City, Vietnam
| | - Tho H Le
- Faculty of Chemistry, University of Science, Ho Chi Minh City, Vietnam.,Vietnam National University, Ho Chi Minh City, Vietnam
| | - Truong N V Do
- Faculty of Chemistry, University of Science, Ho Chi Minh City, Vietnam.,Vietnam National University, Ho Chi Minh City, Vietnam
| | - Thinh D Le
- Faculty of Chemistry, University of Science, Ho Chi Minh City, Vietnam.,Vietnam National University, Ho Chi Minh City, Vietnam
| | - Tu H Tran
- Faculty of Chemistry, University of Science, Ho Chi Minh City, Vietnam.,Vietnam National University, Ho Chi Minh City, Vietnam
| | - Mai T T Nguyen
- Faculty of Chemistry, University of Science, Ho Chi Minh City, Vietnam.,Vietnam National University, Ho Chi Minh City, Vietnam.,Cancer Research Laboratory, University of Science, Ho Chi Minh City, Vietnam
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3
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Nguyen MTT, Nguyen HX, Dang PH, Le TH, Do TNV, Omar AM, Awale S, Nguyen NT. Panduratins Q-Y, dimeric metabolites from Boesenbergia rotunda and their antiausterity activities against the PANC-1 human pancreatic cancer cell line. Phytochemistry 2021; 183:112646. [PMID: 33421887 DOI: 10.1016/j.phytochem.2020.112646] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2020] [Revised: 12/18/2020] [Accepted: 12/22/2020] [Indexed: 06/12/2023]
Abstract
A methanolic extract of the rhizomes of Boesenbergia rotunda showed potent preferential cytotoxicity against PANC-1 human pancreatic cancer cells under nutrient deficiency conditions with a PC50 value of 6.6 μg/mL. Bioactivity-guided phytochemical investigation of the rhizomes of B. rotunda led to the isolation of nine undescribed dimeric metabolites, panduratins Q-Y. Their structures were elucidated based on NMR, MS, and ECD spectroscopic data interpretation. Panduratins Q-S and U-W exhibited potent cytotoxicity towards PANC-1 cell line with the PC50 values ranging from 0.8 to 6.3 μM. Panduratin W, which possessed a cyclohexenylchalcone-linked flavanone skeleton, showed the most cytotoxicity with a PC50 value of 0.8 μM under nutrient-deprived medium.
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Affiliation(s)
- Mai T T Nguyen
- Faculty of Chemistry, University of Science, 227 Nguyen Van Cu Street, District 5, Ho Chi Minh City, Viet Nam; Cancer Research Laboratory, University of Science, 227 Nguyen Van Cu Street, District 5, Ho Chi Minh City, Viet Nam; Vietnam National University, Quarter 6, Linh Trung Ward, Thu Duc District, Ho Chi Minh City, Viet Nam
| | - Hai X Nguyen
- Faculty of Chemistry, University of Science, 227 Nguyen Van Cu Street, District 5, Ho Chi Minh City, Viet Nam; Vietnam National University, Quarter 6, Linh Trung Ward, Thu Duc District, Ho Chi Minh City, Viet Nam
| | - Phu H Dang
- Faculty of Chemistry, University of Science, 227 Nguyen Van Cu Street, District 5, Ho Chi Minh City, Viet Nam; Vietnam National University, Quarter 6, Linh Trung Ward, Thu Duc District, Ho Chi Minh City, Viet Nam
| | - Tho H Le
- Faculty of Chemistry, University of Science, 227 Nguyen Van Cu Street, District 5, Ho Chi Minh City, Viet Nam; Vietnam National University, Quarter 6, Linh Trung Ward, Thu Duc District, Ho Chi Minh City, Viet Nam
| | - Truong N V Do
- Faculty of Chemistry, University of Science, 227 Nguyen Van Cu Street, District 5, Ho Chi Minh City, Viet Nam; Vietnam National University, Quarter 6, Linh Trung Ward, Thu Duc District, Ho Chi Minh City, Viet Nam
| | - Ashraf M Omar
- Division of Natural Drug Discovery, Institute of Natural Medicine, University of Toyama, 2630 Sugitani, Toyama, 930-0194, Japan
| | - Suresh Awale
- Division of Natural Drug Discovery, Institute of Natural Medicine, University of Toyama, 2630 Sugitani, Toyama, 930-0194, Japan
| | - Nhan T Nguyen
- Faculty of Chemistry, University of Science, 227 Nguyen Van Cu Street, District 5, Ho Chi Minh City, Viet Nam; Cancer Research Laboratory, University of Science, 227 Nguyen Van Cu Street, District 5, Ho Chi Minh City, Viet Nam; Vietnam National University, Quarter 6, Linh Trung Ward, Thu Duc District, Ho Chi Minh City, Viet Nam.
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4
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Dang PH, Dao THX, Le VT, Nguyen CM, Ly TT, Nguyen HX, Le TH, Do TNV, Nguyen MTT, Sun S, Awale S, Nguyen NT. Synthesis of Alkyl Triphenylphosphonium Ostruthin Derivatives as Potential Cytotoxic Candidates. ChemistrySelect 2020. [DOI: 10.1002/slct.202003152] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Phu H. Dang
- Faculty of Chemistry University of Science Ho Chi Minh City 72711 Vietnam
- Vietnam National University Ho Chi Minh City 71300 Vietnam
| | - Thien H. X. Dao
- Faculty of Chemistry University of Science Ho Chi Minh City 72711 Vietnam
- Vietnam National University Ho Chi Minh City 71300 Vietnam
| | - Vien T. Le
- Faculty of Chemistry University of Science Ho Chi Minh City 72711 Vietnam
- Vietnam National University Ho Chi Minh City 71300 Vietnam
| | - Chien M. Nguyen
- Faculty of Chemistry University of Science Ho Chi Minh City 72711 Vietnam
- Vietnam National University Ho Chi Minh City 71300 Vietnam
| | - Tin T. Ly
- Faculty of Chemistry University of Science Ho Chi Minh City 72711 Vietnam
- Vietnam National University Ho Chi Minh City 71300 Vietnam
| | - Hai X. Nguyen
- Faculty of Chemistry University of Science Ho Chi Minh City 72711 Vietnam
- Vietnam National University Ho Chi Minh City 71300 Vietnam
| | - Tho H. Le
- Faculty of Chemistry University of Science Ho Chi Minh City 72711 Vietnam
- Vietnam National University Ho Chi Minh City 71300 Vietnam
| | - Truong N. V. Do
- Faculty of Chemistry University of Science Ho Chi Minh City 72711 Vietnam
- Vietnam National University Ho Chi Minh City 71300 Vietnam
| | - Mai T. T. Nguyen
- Faculty of Chemistry University of Science Ho Chi Minh City 72711 Vietnam
- Vietnam National University Ho Chi Minh City 71300 Vietnam
- Cancer Research Laboratory University of Science Ho Chi Minh City 72711 Vietnam
| | - Sijia Sun
- Division of Natural Drug Discovery Institute of Natural Medicine University of Toyama 2630 Sugitani, Toyama 930–0194 Japan
| | - Suresh Awale
- Division of Natural Drug Discovery Institute of Natural Medicine University of Toyama 2630 Sugitani, Toyama 930–0194 Japan
| | - Nhan T. Nguyen
- Faculty of Chemistry University of Science Ho Chi Minh City 72711 Vietnam
- Vietnam National University Ho Chi Minh City 71300 Vietnam
- Cancer Research Laboratory University of Science Ho Chi Minh City 72711 Vietnam
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5
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Nguyen MTT, Nguyen KDH, Dang PH, Nguyen HX, Awale S, Nguyen NT. A new cytotoxic cardenolide from the roots of Calotropis gigantea. Nat Prod Res 2020; 35:5096-5101. [PMID: 32571094 DOI: 10.1080/14786419.2020.1781114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Bioactivity-guided isolation of the CHCl3-soluble fraction of the roots of Calotropis gigantea was carried out to obtain a new cardenolide glycoside, caloside G. Its absolute structure was elucidated based on NMR and ECD spectroscopic data interpretation. Caloside G showed noteworthy cytotoxicity against the PANC-1 human pancreatic and HeLa human cervical carcinoma cell lines, with the submicromolar IC50 values of 0.038 and 0.09 µM, respectively.
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Affiliation(s)
- Mai T T Nguyen
- Faculty of Chemistry, University of Science, Ho Chi Minh City, Vietnam.,Cancer Research Laboratory, University of Science, Ho Chi Minh City, Vietnam.,Vietnam National University, Ho Chi Minh City, Vietnam
| | - Khang D H Nguyen
- Faculty of Chemistry, University of Science, Ho Chi Minh City, Vietnam.,Vietnam National University, Ho Chi Minh City, Vietnam
| | - Phu H Dang
- Faculty of Chemistry, University of Science, Ho Chi Minh City, Vietnam.,Vietnam National University, Ho Chi Minh City, Vietnam
| | - Hai X Nguyen
- Faculty of Chemistry, University of Science, Ho Chi Minh City, Vietnam.,Vietnam National University, Ho Chi Minh City, Vietnam
| | - Suresh Awale
- Division of Natural Drug Discovery, Institute of Natural Medicine, University of Toyama, Toyama, Japan
| | - Nhan T Nguyen
- Faculty of Chemistry, University of Science, Ho Chi Minh City, Vietnam.,Cancer Research Laboratory, University of Science, Ho Chi Minh City, Vietnam.,Vietnam National University, Ho Chi Minh City, Vietnam
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6
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Nguyen MTT, Nguyen KDH, Dang PH, Nguyen HX, Awale S, Nguyen NT. Calosides A-F, Cardenolides from Calotropis gigantea and Their Cytotoxic Activity. J Nat Prod 2020; 83:385-391. [PMID: 31967821 DOI: 10.1021/acs.jnatprod.9b00875] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Phytochemical analysis of the roots of Calotropis gigantea led to the isolation of six new cardenolide glycosides, calosides A-F (1-6), and five known cardenolides (7-11). The structures of 1-6 were elucidated based on NMR and ECD spectroscopic data interpretation. Caloside D (4) is the first naturally occurring example of a cardenolide containing a C-8/C-19 oxygen bridge. In turn, calosides E (5) and F (6) represent the first naturally occurring 3-epi-cannogenol diglycosides having potent cytotoxicity against the PANC-1 cell line (IC50, 0.081 and 0.070 μM, respectively) and HeLa (IC50, both 0.17 μM) cells, under normoglycemic conditions.
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Affiliation(s)
| | | | | | | | - Suresh Awale
- Division of Natural Drug Discovery, Institute of Natural Medicine , University of Toyama , 2630 Sugitani , Toyama 930-0194 , Japan
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7
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Dang PH, Nguyen LTT, Nguyen HTT, Le TH, Do TNV, Nguyen HX, Le ND, Nguyen MTT, Nguyen NT. A new dimeric alkylresorcinol from the stem barks of Swintonia floribunda (Anacardiaceae). Nat Prod Res 2018; 33:2883-2889. [PMID: 30295064 DOI: 10.1080/14786419.2018.1509329] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
From an EtOAc-soluble fraction of the stem barks of Swintonia floribunda (Anacardiaceae), one new dimeric alkylresorcinol named integracin E (1), together with 4 known compounds (2-5) were isolated. Their chemical structures were elucidated based on the spectroscopic data interpretation. The absolute configuration of 1 was determined by the specific rotation analysis of its acid-catalyzed hydrolysis product. Compound 1 showed potent tyrosinase inhibitory activity with an IC50 value of 48.2 μM.
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Affiliation(s)
- Phu H Dang
- a Faculty of Chemistry, VNUHCM-University of Science , Ho Chi Minh City , Vietnam
| | - Linh T T Nguyen
- a Faculty of Chemistry, VNUHCM-University of Science , Ho Chi Minh City , Vietnam
| | - Hue T T Nguyen
- a Faculty of Chemistry, VNUHCM-University of Science , Ho Chi Minh City , Vietnam
| | - Tho H Le
- a Faculty of Chemistry, VNUHCM-University of Science , Ho Chi Minh City , Vietnam
| | - Truong N V Do
- a Faculty of Chemistry, VNUHCM-University of Science , Ho Chi Minh City , Vietnam
| | - Hai X Nguyen
- a Faculty of Chemistry, VNUHCM-University of Science , Ho Chi Minh City , Vietnam
| | - Nghia D Le
- a Faculty of Chemistry, VNUHCM-University of Science , Ho Chi Minh City , Vietnam
| | - Mai T T Nguyen
- a Faculty of Chemistry, VNUHCM-University of Science , Ho Chi Minh City , Vietnam.,b Cancer Research Laboratory, Vietnam National University , Ho Chi Minh City , Vietnam
| | - Nhan T Nguyen
- a Faculty of Chemistry, VNUHCM-University of Science , Ho Chi Minh City , Vietnam.,b Cancer Research Laboratory, Vietnam National University , Ho Chi Minh City , Vietnam
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8
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Abstract
From an EtOAc-soluble fraction of the leaves of Azadirachta indica, one new lactam 28-norlimonoid named nimbandiolactam-21 (1), together with 2 known limonoids (2 and 3) were isolated. Their relative structures were elucidated based on NMR spectroscopic analysis. Nimbandiolactone-23 (2) showed the most potent α-glucosidase inhibitory activity, with an IC50 value of 38.7 μM. Compound 1 represents the first naturally occurring example of a 28-norlimonoid having the lactam moiety. The plausible biosynthetic pathway for the formation of lactam moiety in 1 was proposed.
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Affiliation(s)
- Nhi Y T Nguyen
- a Faculty of Chemistry , VNUHCM-University of Science , Ho Chi Minh City , Vietnam
| | - Phu H Dang
- a Faculty of Chemistry , VNUHCM-University of Science , Ho Chi Minh City , Vietnam
| | - Van T T Nguyen
- a Faculty of Chemistry , VNUHCM-University of Science , Ho Chi Minh City , Vietnam
| | - Phuc H Dang
- b Theoretical Physics Research Group , Advanced Institute of Materials Science, Ton Duc Thang University , Ho Chi Minh City , Vietnam.,c Faculty of Applied Sciences , Ton Duc Thang University , Ho Chi Minh City , Vietnam
| | - Quan L Tran
- a Faculty of Chemistry , VNUHCM-University of Science , Ho Chi Minh City , Vietnam
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9
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Nguyen MTT, Le TH, Nguyen HX, Dang PH, Do TNV, Abe M, Takagi R, Nguyen NT. Artocarmins G-M, Prenylated 4-Chromenones from the Stems of Artocarpus rigida and Their Tyrosinase Inhibitory Activities. J Nat Prod 2017; 80:3172-3178. [PMID: 29227656 DOI: 10.1021/acs.jnatprod.7b00453] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Phytochemical analysis of an EtOAc extract of the stems of Artocarpus rigida led to the identification of seven new prenylated 4-chromenones, artocarmins G-M (1-7), and nine known compounds (8-17). Their structures were identified based on physical data analysis. In the tyrosinase inhibitory activity test, norartocarpetin (8) displayed the strongest effect, with an IC50 value of 0.023 μM.
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Affiliation(s)
| | | | | | | | | | - Manabu Abe
- Department of Chemistry, Graduate School of Science, Hiroshima University , Higashi-Hiroshima, Hiroshima 739-8526, Japan
| | - Ryukichi Takagi
- Department of Chemistry, Graduate School of Science, Hiroshima University , Higashi-Hiroshima, Hiroshima 739-8526, Japan
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10
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Affiliation(s)
- Phu H. Dang
- Faculty of Chemistry, VNUHCM–University of Science, Ho Chi Minh City, Vietnam
| | - Tinh T. Nguyen
- Faculty of Chemistry, VNUHCM–University of Science, Ho Chi Minh City, Vietnam
| | - Tho H. Le
- Faculty of Chemistry, VNUHCM–University of Science, Ho Chi Minh City, Vietnam
| | - Hai X. Nguyen
- Faculty of Chemistry, VNUHCM–University of Science, Ho Chi Minh City, Vietnam
| | - Mai T. T. Nguyen
- Faculty of Chemistry, VNUHCM–University of Science, Ho Chi Minh City, Vietnam
- Cancer Research Laboratory, Vietnam National University, Ho Chi Minh City, Vietnam
| | - Nhan T. Nguyen
- Faculty of Chemistry, VNUHCM–University of Science, Ho Chi Minh City, Vietnam
- Cancer Research Laboratory, Vietnam National University, Ho Chi Minh City, Vietnam
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11
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Dang PH, Nguyen HH, Truong HT, Do TN, Nguyen HX, Nguyen MT, Abe M, Takagi R, Nguyen NT. Two ring opened oxetane taxoids containing a C-20 benzoyloxy group from the roots of Taxus wallichiana Zucc. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2017.08.073] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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12
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Nguyen NT, Dang PH, Vu NXT, Le TH, Nguyen MTT. Quinoliniumolate and 2H-1,2,3-Triazole Derivatives from the Stems of Paramignya trimera and Their α-Glucosidase Inhibitory Activities: In Vitro and in Silico Studies. J Nat Prod 2017; 80:2151-2155. [PMID: 28726400 DOI: 10.1021/acs.jnatprod.7b00289] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
From a CHCl3-soluble extract of the stems of Paramignya trimera, two new alkaloids, (E)-2-(prop-1-enyl)-N-methylquinolinium-4-olate (1) and (R)-2-ethylhexyl 2H-1,2,3-triazole-4-carboxylate (2), were isolated. Their structures were elucidated based on the spectroscopic data interpretation. Compound 2 possesses α-glucosidase inhibitory activity, with an IC50 value of 137.9 μM. Molecular docking studies of 1 and 2 with human maltase-glucoamylase (MGAM) were performed for the first time; thus, the 2,3-diH+-1H-1,2,3-triazolium cation (2i) showed good interactions with both MGAM-N (2QMJ) and -C (3TOP) terminal subunits.
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Affiliation(s)
- Nhan T Nguyen
- Faculty of Chemistry, VNUHCM-University of Science , 227 Nguyen Van Cu Street, District 5, Ho Chi Minh City, Vietnam
- Cancer Research Laboratory, Vietnam National University, Ho Chi Minh City , 227 Nguyen Van Cu Street, District 5, Ho Chi Minh City, Vietnam
| | - Phu H Dang
- Faculty of Chemistry, VNUHCM-University of Science , 227 Nguyen Van Cu Street, District 5, Ho Chi Minh City, Vietnam
| | - Ngoc X T Vu
- Faculty of Chemistry, VNUHCM-University of Science , 227 Nguyen Van Cu Street, District 5, Ho Chi Minh City, Vietnam
| | - Tho H Le
- Faculty of Chemistry, VNUHCM-University of Science , 227 Nguyen Van Cu Street, District 5, Ho Chi Minh City, Vietnam
| | - Mai T T Nguyen
- Faculty of Chemistry, VNUHCM-University of Science , 227 Nguyen Van Cu Street, District 5, Ho Chi Minh City, Vietnam
- Cancer Research Laboratory, Vietnam National University, Ho Chi Minh City , 227 Nguyen Van Cu Street, District 5, Ho Chi Minh City, Vietnam
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13
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Nguyen KD, Dang PH, Nguyen HX, Nguyen MT, Awale S, Nguyen NT. Phytochemical and cytotoxic studies on the leaves of Calotropis gigantea. Bioorg Med Chem Lett 2017; 27:2902-2906. [DOI: 10.1016/j.bmcl.2017.04.087] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2017] [Revised: 04/06/2017] [Accepted: 04/27/2017] [Indexed: 11/25/2022]
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14
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Dang PH, Nguyen HX, Nguyen HHT, Vo TD, Le TH, Phan THN, Nguyen MTT, Nguyen NT. Lignans from the Roots of Taxus wallichiana and Their α-Glucosidase Inhibitory Activities. J Nat Prod 2017; 80:1876-1882. [PMID: 28581744 DOI: 10.1021/acs.jnatprod.7b00171] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
From an EtOAc-soluble extract of the roots of Taxus wallichiana, six new (1-6) and 11 known lignans were isolated. The structures of the new compounds were elucidated based on interpretation of spectroscopic data. (+)-7'-epi-Tsugacetal (1) is a rare aryltetralin-type lignan having a cis-orientation of H-7' and H-8'. Compounds 3-6 were identified as the first naturally occurring tetrahydrofuranoid lignans having a cis-orientation of H-7 and H-8. All tested compounds were found to possess α-glucosidase inhibitory activity, with formosanol (9) showing the most potent effect with an IC50 value of 35.3 μM.
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Affiliation(s)
- Phu H Dang
- Faculty of Chemistry, VNUHCM-University of Science , 227 Nguyen Van Cu Street, District 5, Ho Chi Minh City, Vietnam
| | - Hai X Nguyen
- Faculty of Chemistry, VNUHCM-University of Science , 227 Nguyen Van Cu Street, District 5, Ho Chi Minh City, Vietnam
| | - Hanh H T Nguyen
- Faculty of Chemistry, VNUHCM-University of Science , 227 Nguyen Van Cu Street, District 5, Ho Chi Minh City, Vietnam
| | - Thai D Vo
- Faculty of Chemistry, VNUHCM-University of Science , 227 Nguyen Van Cu Street, District 5, Ho Chi Minh City, Vietnam
| | - Tho H Le
- Faculty of Chemistry, VNUHCM-University of Science , 227 Nguyen Van Cu Street, District 5, Ho Chi Minh City, Vietnam
| | - Trong H N Phan
- Faculty of Chemistry, VNUHCM-University of Science , 227 Nguyen Van Cu Street, District 5, Ho Chi Minh City, Vietnam
| | - Mai T T Nguyen
- Faculty of Chemistry, VNUHCM-University of Science , 227 Nguyen Van Cu Street, District 5, Ho Chi Minh City, Vietnam
- Cancer Research Laboratory, Vietnam National University, Ho Chi Minh City , 227 Nguyen Van Cu Street, District 5, Ho Chi Minh City, Vietnam
| | - Nhan T Nguyen
- Faculty of Chemistry, VNUHCM-University of Science , 227 Nguyen Van Cu Street, District 5, Ho Chi Minh City, Vietnam
- Cancer Research Laboratory, Vietnam National University, Ho Chi Minh City , 227 Nguyen Van Cu Street, District 5, Ho Chi Minh City, Vietnam
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15
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Dunn TS, Dang PH, Mattison G, Hanna RE, Nizami WA. Ultrastructural observations on the redial tegument of Paramphistomum epiclitum from the planorbid snail, Indoplanorbis exustus. J Helminthol 1992; 66:167-76. [PMID: 1452991 DOI: 10.1017/s0022149x00014516] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The morphology of the tegument in the redia of Paramphistomum epiclitum (Digenea: Paramphistomidae) resembles that shown by most larval and adult digeneans; an outer surface syncytium is in continuity with the cytoplasm of in-sunken, nucleated cytons. Although tegumental cytons usually contain a single nucleus, some display up to six nuclei. The tegumental syncytium lining the pharynx of P. epiclitum rediae lack underlying cytons. The apical membrane of the tegument is elaborated by folds and microvilli, which presumably facilitate uptake of nutrients and/or exchange of ions involved in osmoregulation. A single type of secretory body, resulting from the fusion of smaller vesicles produced at Golgi complexes in the cytons, occurs throughout the tegument. Uniciliate sensory receptors occur in the surface syncytium particularly around the oral opening.
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Affiliation(s)
- T S Dunn
- Zoology Department, University of Oklahoma, Norman 73019
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