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Nguyen THV, Tran TT, Do HN, Quan PM, Pham CB, Dang HH, Lam DT, Minh PTH. A new benzophenanthridine alkaloid from stem bark of Zanthoxylum rhetsa and its biological activities. Nat Prod Res 2023:1-13. [PMID: 38146230 DOI: 10.1080/14786419.2023.2297261] [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] [Received: 03/30/2023] [Accepted: 12/11/2023] [Indexed: 12/27/2023]
Abstract
A new benzophenanthridine alkaloid 6-butanoyldihydrochelerythrine (1) and five known alkaloids 6-acetonyldihydronitidine (2), 6-acetonyldihydrochelerythrine (3), isocorydine (4), (O)-methyltembamide (5), N-(4-methoxyphenethyl)benzamide (6) were isolated from the stem barks of Zanthoxylum rhetsa. These structures were elucidated by 1D, 2D NMR spectroscopy and by mass spectrometry. This is the first time that compounds 2-6 were identified from Zanthoxylum rhetsa and the first time that compounds 4 and 6 were identified from the genus Zanthoxylum. Bioactivity results of isolated compounds showed that 1, 2, 5 and 6 exhibited inhibitory activity against MCF7 and A549 cell lines, while 3 showed the inhibitory activity against A549 cell line; all isolated compounds 1-6 inhibited at least two strain microorganisms; compound 4 showed angiotensin II converting enzyme inhibitory activity in vitro with IC50 value of 65.58 µM and in silico with a docking score of -11.52 kcal/mol.
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Affiliation(s)
- Thi Hong Van Nguyen
- Institute of Natural Product Chemistry (INPC), Vietnam Academy of Science and Technology (VAST), 18 Hoang Quoc Viet street, Cau Giay, Hanoi, Vietnam
- Graduate University of Science and Techology, VAST, 18 Hoang Quoc Viet street, Cau Giay, Hanoi, Vietnam
| | - Thi Tuyen Tran
- Institute of Natural Product Chemistry (INPC), Vietnam Academy of Science and Technology (VAST), 18 Hoang Quoc Viet street, Cau Giay, Hanoi, Vietnam
| | - Huu Nghi Do
- Institute of Natural Product Chemistry (INPC), Vietnam Academy of Science and Technology (VAST), 18 Hoang Quoc Viet street, Cau Giay, Hanoi, Vietnam
- Graduate University of Science and Techology, VAST, 18 Hoang Quoc Viet street, Cau Giay, Hanoi, Vietnam
| | - Pham Minh Quan
- Institute of Natural Product Chemistry (INPC), Vietnam Academy of Science and Technology (VAST), 18 Hoang Quoc Viet street, Cau Giay, Hanoi, Vietnam
- Graduate University of Science and Techology, VAST, 18 Hoang Quoc Viet street, Cau Giay, Hanoi, Vietnam
| | - Cao Bach Pham
- Institute of Natural Product Chemistry (INPC), Vietnam Academy of Science and Technology (VAST), 18 Hoang Quoc Viet street, Cau Giay, Hanoi, Vietnam
| | - Hoang Hiep Dang
- University of Science and Technology of Hanoi, VAST, 18 Hoang Quoc Viet street, Cau Giay, Hanoi, Vietnam
| | - Do Tien Lam
- Institute of Natural Product Chemistry (INPC), Vietnam Academy of Science and Technology (VAST), 18 Hoang Quoc Viet street, Cau Giay, Hanoi, Vietnam
| | - Pham Thi Hong Minh
- Institute of Natural Product Chemistry (INPC), Vietnam Academy of Science and Technology (VAST), 18 Hoang Quoc Viet street, Cau Giay, Hanoi, Vietnam
- Graduate University of Science and Techology, VAST, 18 Hoang Quoc Viet street, Cau Giay, Hanoi, Vietnam
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Le VTT, Hung HV, Ha NX, Le CH, Minh PTH, Lam DT. Natural Phosphodiesterase-4 Inhibitors with Potential Anti-Inflammatory Activities from Millettia dielsiana. Molecules 2023; 28:7253. [PMID: 37959674 PMCID: PMC10650832 DOI: 10.3390/molecules28217253] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2023] [Revised: 10/06/2023] [Accepted: 10/09/2023] [Indexed: 11/15/2023] Open
Abstract
The results of in silico screening of the 50 isolated compounds from Millettia dielsiana against the target proteins PDE4 (PDE4A, PDE4B, and PDE4D) showed binding affinity ranges from -5.81 to -11.56, -5.27 to -13.01, and -5.80 to -12.12 kcal mol-1, respectively, with median values of -8.83, -8.84, and -8.645 kcal mol-1, respectively. Among these compounds, Millesianin F was identified as the most promising PDE4A inhibitor due to its strongest binding affinity with the target protein PDE4A. (-11.56 kcal mol-1). This was followed by the compound 5,7,4'-trihydroxyisoflavone 7-O-β-d-apiofuranosyl-(1→6)-β-d-glucopyranoside (D50) with the binding affinity value of -11.35 kcal mol-1. For the target protein PDE4B, compound D50 exhibited the strongest binding affinity value of -13.01 kcal mol-1, while showing poorer inhibition ability for PDE4D. The 100 ns MD simulation examination (radius of gyration, Solvent Accessible Surface Area (SASA), Root-Mean-Square Deviation (RMSD), Root-Mean-Square Fluctuation (RMSF), and hydrogen bonding) was carried out to examine the overall stability and binding efficiency of the protein-ligand complex between compounds (Millesianin F, Millesianin G, Claclrastin-7-O-β-d-glucopyranoside, 7-hydroxy-4',6 dimethoxyisoflavone-7-O-β-d-apiofuranosyl-(1→6)-β-d-glucopyranoside, 7-hydroxy-4',8-dimethoxyisoflavone 7-O-β-d-apiofuranosyl-(1→6)-β-d-glucopyranoside, Odoratin-7-O-β-d-glucopyranoside, and 5,7,4'-trihydroxyisoflavone 7-O-β-d-apiofuranosyl-(1→6)-β-d-glucopyranoside) and PDE4 (A, B) subtype proteins. Compound D50 has shown strong anti-inflammatory activity, as evidenced by experimental results. It effectively inhibits PDE4B and PDE4D, with IC50 values of 6.56 ± 0.7 µM and 11.74 ± 1.3 µM, respectively. Additionally, it reduces NO production, with an IC50 value of 5.40 ± 0.9 µM. Based on these findings, it is promising and considered a potential novel anti-inflammatory drug for future development.
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Affiliation(s)
- Vu Thi Thu Le
- Thai Nguyen University of Agriculture and Forestry, Quyet Thang, Thai Nguyen 24119, Vietnam; (V.T.T.L.)
| | - Hoang Van Hung
- Thai Nguyen University-Lao Cai Campus, Thai Nguyen University, Lao Cai City 31000, Vietnam
| | - Nguyen Xuan Ha
- Institute of Natural Products Chemistry, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi 10072, Vietnam
| | - Cao Hong Le
- Thai Nguyen University of Agriculture and Forestry, Quyet Thang, Thai Nguyen 24119, Vietnam; (V.T.T.L.)
| | - Pham Thi Hong Minh
- Institute of Natural Products Chemistry, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi 10072, Vietnam
| | - Do Tien Lam
- Institute of Natural Products Chemistry, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi 10072, Vietnam
- Faculty of Chemistry, Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi 10072, Vietnam
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Nguyen TH, Thai QM, Pham MQ, Minh PTH, Phung HTT. Machine learning combines atomistic simulations to predict SARS-CoV-2 Mpro inhibitors from natural compounds. Mol Divers 2023:10.1007/s11030-023-10601-1. [PMID: 36823394 PMCID: PMC9950021 DOI: 10.1007/s11030-023-10601-1] [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] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2022] [Accepted: 01/04/2023] [Indexed: 02/25/2023]
Abstract
To date, the COVID-19 pandemic has still been infectious around the world, continuously causing social and economic damage on a global scale. One of the most important therapeutic targets for the treatment of COVID-19 is the main protease (Mpro) of SARS-CoV-2. In this study, we combined machine-learning (ML) model with atomistic simulations to computationally search for highly promising SARS-CoV-2 Mpro inhibitors from the representative natural compounds of the National Cancer Institute (NCI) Database. First, the trained ML model was used to scan the library quickly and reliably for possible Mpro inhibitors. The ML output was then confirmed using atomistic simulations integrating molecular docking and molecular dynamic simulations with the linear interaction energy scheme. The results turned out to show that there was evidently good agreement between ML and atomistic simulations. Ten substances were proposed to be able to inhibit SARS-CoV-2 Mpro. Seven of them have high-nanomolar affinity and are very potential inhibitors. The strategy has been proven to be reliable and appropriate for fast prediction of SARS-CoV-2 Mpro inhibitors, benefiting for new emerging SARS-CoV-2 variants in the future accordingly.
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Affiliation(s)
- Trung Hai Nguyen
- Laboratory of Theoretical and Computational Biophysics, Advanced Institute of Materials Science, Ton Duc Thang University, Ho Chi Minh City, Vietnam
- Faculty of Pharmacy, Ton Duc Thang University, Ho Chi Minh City, Vietnam
| | - Quynh Mai Thai
- Faculty of Pharmacy, Ton Duc Thang University, Ho Chi Minh City, Vietnam
| | - Minh Quan Pham
- Institute of Natural Products Chemistry, Vietnam Academy of Science and Technology, Hanoi, Vietnam
- Graduate University of Science and Technology, Vietnam Academy of Science and Technology, Hanoi, Vietnam
| | - Pham Thi Hong Minh
- Institute of Natural Products Chemistry, Vietnam Academy of Science and Technology, Hanoi, Vietnam
- Graduate University of Science and Technology, Vietnam Academy of Science and Technology, Hanoi, Vietnam
| | - Huong Thi Thu Phung
- NTT Hi-Tech Institute, Nguyen Tat Thanh University, Ho Chi Minh City, Vietnam
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Lam DT, Le VTT, Quan PM, Minh PTH, Thuy TTT, Anh NTN, Tai BH, Kiem PV. Two new terpenoids from the leaves of callicarpa macrophylla. Nat Prod Res 2021; 35:1107-1114. [PMID: 31303054 DOI: 10.1080/14786419.2019.1639180] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2019] [Revised: 06/17/2019] [Accepted: 06/29/2019] [Indexed: 10/26/2022]
Abstract
Two new terpenoids (1-2) and seven known compounds (3-9) were isolated from methanol extract of Callicarpa macrophylla leaves. Their structures were determined to be ent-7α,16β,17,18-tetrahydroxykaur-15-one (1), 3β-acetoxy-urs-12-ene-11-one-12-ol (2), ent-1β-acetoxy-7α,14β-dihydroxykaur-16-en-15-one (3), 3β-acetoxy-11α,13β-dihydroxyolean-12-one (4), β-amyrin (5), spinasterol (6), ursolic acid (7), β-sitosterol (8), and daucosterol (9) by analyses of their MS, NMR spectroscopic data and by comparison with those reported in the literature. Compounds 1 - 4, and 7 displayed potential cytotoxic activity towards HepG-2, LU-1, and MCF-7 human cancer cell lines with IC50 values ranging from 0.46 ± 0.21 to 18.14 ± 0.33 μM. Compound 6 showed IC50 values of 14.17 ± 0.21 and 5.72 ± 0.42 μM against Hep-G2 and MCF-7 cell lines, respectively.
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Affiliation(s)
- Do Tien Lam
- Vietnam Academy of Science and Technology (VAST), Graduate University of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam
- Institute of Natural Product Chemistry, VAST, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam
| | - Vu Thi Thu Le
- Vietnam Academy of Science and Technology (VAST), Graduate University of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam
- Thai Nguyen University of Agriculture and Forestry, Quyet Thang, Thai Nguyen city, Vietnam
| | - Pham Minh Quan
- Vietnam Academy of Science and Technology (VAST), Graduate University of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam
- Institute of Natural Product Chemistry, VAST, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam
| | - Pham Thi Hong Minh
- Vietnam Academy of Science and Technology (VAST), Graduate University of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam
- Institute of Natural Product Chemistry, VAST, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam
| | - Ta Thi Thu Thuy
- Hanoi Open University, B101, Nguyen Hien, Hai Ba Trung, Hanoi, Vietnam
| | | | - Bui Huu Tai
- Vietnam Academy of Science and Technology (VAST), Graduate University of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam
- Institute of Marine Biochemistry, VAST, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam
| | - Phan Van Kiem
- Vietnam Academy of Science and Technology (VAST), Graduate University of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam
- Institute of Marine Biochemistry, VAST, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam
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Tuyen TT, Quan PM, Thu Le VT, Toan TQ, Nghi DH, Bach PC, Inh CT, Hanh NP, Vien TA, Hong Minh PT, Long PQ, Khoi Nguyen NH, Thuy Dung PN, Hong Van NT. Chemical Composition, Antimicrobial, and Cytotoxic Activities of Leaf, Fruit, and Branch Essential Oils Obtained From Zanthoxylum nitidum Grown in Vietnam. Nat Prod Commun 2021. [DOI: 10.1177/1934578x20985649] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Zanthoxylum nitidum (Roxb.) DC is a traditional Vietnamese medicine to treat coughs, stomachache, toothache, blood stagnation, and sore throats. The essential oils (EOs) of the leaves, fruits, and stems of this plant were extracted by hydrodistillation and subjected to analysis by gas chromatography (GC)-flame ionization detector (FID) and GC-mass spectrometry (MS). The isolated EOs were then evaluated in terms of their antimicrobial activity by minimum inhibitory concentration (MIC) assay and in vitro cytotoxic effect against 5 human tumor cell lines. GC-MS-FID analysis showed 35, 32, and 25 compounds accounting for 97.6%, 91.7%, and 96.2% of the total EO contents from the leaves, fruits, and stems, respectively. The major compounds of the leaf EO were limonene (44.3%), β-caryophyllene (12.5%), linalool (11.0%), germacrene D (5.3%), and α-pinene (4.9%); the major compounds of the fruit EO were n-pentadecane (34.8%), sabinene (18.3%), and n-heptadecane (4.7%), and the major components of the stem EO were 2-undecanone (72.3%), β-caryophyllene (5.8%), and germacrene D (4.0%). The EOs of leaves, fruits, and stems of Z. nitidum exhibited antibacterial activity against Bacillus subtilis, Escherichia coli, and Fusarium oxysporum with MIC values of 100 µg/mL. The leaf and branch EOs exhibited cytotoxic activity against all tested cancer cell lines, especially A-549 and HepG-2. Findings from the present study provide important knowledge about the potential uses of Z. nitidum EOs as a natural antibacterial and antitumor agents.
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Affiliation(s)
- Tran Thi Tuyen
- Institute of Natural Products Chemistry (INPC), Vietnam Academy of Science and Technology (VAST), Ha Noi, Vietnam
- Graduate University of Sciences and Technology, VAST, Ha Noi, Vietnam
| | - Pham Minh Quan
- Institute of Natural Products Chemistry (INPC), Vietnam Academy of Science and Technology (VAST), Ha Noi, Vietnam
- Graduate University of Sciences and Technology, VAST, Ha Noi, Vietnam
| | - Vu Thi Thu Le
- Thai Nguyen University of Agriculture and Forestry, Thai Nguyen, Vietnam
| | - Tran Quoc Toan
- Institute of Natural Products Chemistry (INPC), Vietnam Academy of Science and Technology (VAST), Ha Noi, Vietnam
- Graduate University of Sciences and Technology, VAST, Ha Noi, Vietnam
| | - Do Huu Nghi
- Institute of Natural Products Chemistry (INPC), Vietnam Academy of Science and Technology (VAST), Ha Noi, Vietnam
| | - Pham Cao Bach
- Institute of Natural Products Chemistry (INPC), Vietnam Academy of Science and Technology (VAST), Ha Noi, Vietnam
| | - Cam Thi Inh
- Institute of Natural Products Chemistry (INPC), Vietnam Academy of Science and Technology (VAST), Ha Noi, Vietnam
| | | | | | - Pham Thi Hong Minh
- Institute of Natural Products Chemistry (INPC), Vietnam Academy of Science and Technology (VAST), Ha Noi, Vietnam
| | - Pham Quoc Long
- Institute of Natural Products Chemistry (INPC), Vietnam Academy of Science and Technology (VAST), Ha Noi, Vietnam
| | - Nguyen Hong Khoi Nguyen
- Faculty of Environmental and Food Engineering, Nguyen Tat Thanh University, Ho Chi Minh City, Vietnam
| | - Pham Nguyen Thuy Dung
- NTT Hi-Tech Institute, Nguyen Tat Thanh University, Ho Chi Minh City, Vietnam
- Center of Excellence for Biochemistry and Natural Products, Nguyen Tat Thanh University, Ho Chi Minh City, Vietnam
| | - Nguyen Thi Hong Van
- Institute of Natural Products Chemistry (INPC), Vietnam Academy of Science and Technology (VAST), Ha Noi, Vietnam
- Graduate University of Sciences and Technology, VAST, Ha Noi, Vietnam
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Minh PTH, Lam DT, Tien NQ, Tuan NN, Nhung VP, Van Hai N, Van Kiem P, Nhiem NX, Van Minh C, Ju PS, Hyun KS. New Schiartane-type Triterpene from Kadsura heteroclita and their Cytotoxic Activities. Nat Prod Commun 2014. [DOI: 10.1177/1934578x1400900324] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
One new schiartane- type triterpene, heteroclitalactone N (1), and four known compounds (2–5), seco-coccinic acid F, dihydroguaiaretic acid, schizanrin F, and kadsuralignan B were isolated from the stems of Kadsura heteroclita. Their structures were determined by the combination of spectroscopic and chemical methods, including 1D-, 2D-NMR, and CD spectra as well as by comparing with the NMR data reported in the literature. The cytotoxic activities of all isolated compounds were evaluated on three human cancer cell lines. Compound 3 exhibited moderate to weak cytotoxic activities on three human cancer cell lines, OVCAR, HT-29, and A-549, with IC50 values ranging from 16.2 to 36.4 μM.
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Affiliation(s)
- Pham Thi Hong Minh
- Institute of Chemistry, Vietnam Academy of Science and Technology (VAST), 18 Hoang Quoc Viet, Caugiay, Hanoi, Vietnam
| | - Do Tien Lam
- Institute of Chemistry, Vietnam Academy of Science and Technology (VAST), 18 Hoang Quoc Viet, Caugiay, Hanoi, Vietnam
| | - Nguyen Quyet Tien
- Institute of Chemistry, Vietnam Academy of Science and Technology (VAST), 18 Hoang Quoc Viet, Caugiay, Hanoi, Vietnam
| | - Nguyen Ngoc Tuan
- Institute of Chemistry, Vietnam Academy of Science and Technology (VAST), 18 Hoang Quoc Viet, Caugiay, Hanoi, Vietnam
| | - Vu Phuong Nhung
- Institute of Genome Research, VAST, 18 Hoang Quoc Viet, Caugiay, Hanoi, Vietnam
| | - Nong Van Hai
- Institute of Genome Research, VAST, 18 Hoang Quoc Viet, Caugiay, Hanoi, Vietnam
| | - Phan Van Kiem
- Institute of Marine Biochemistry, VAST, 18 Hoang Quoc Viet, Caugiay, Hanoi, Vietnam
| | - Nguyen Xuan Nhiem
- Institute of Marine Biochemistry, VAST, 18 Hoang Quoc Viet, Caugiay, Hanoi, Vietnam
| | - Chau Van Minh
- Institute of Marine Biochemistry, VAST, 18 Hoang Quoc Viet, Caugiay, Hanoi, Vietnam
| | - Park Seon Ju
- College of Pharmacy, Yonsei Institute of Pharmaceutical Sciences, Yonsei University, Incheon 406–840, Korea
| | - Kim Seung Hyun
- College of Pharmacy, Yonsei Institute of Pharmaceutical Sciences, Yonsei University, Incheon 406–840, Korea
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Minh PTH, Lam DT, Tien NQ, Tuan NN, Nhung VP, Van Hai N, Van Kiem P, Nhiem NX, Van Minh C, Ju PS, Hyun KS. New schiartane-type triterpene from Kadsura heteroclita and their cytotoxic activities. Nat Prod Commun 2014; 9:373-374. [PMID: 24689220] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/03/2023] Open
Abstract
One new schiartane-type triterpene, heteroclitalactone N (1), and four known compounds (2-5), seco-coccinic acid F, dihydroguaiaretic acid, schizanrin F, and kadsuralignan B were isolated from the stems of Kadsura heteroclita. Their structures were determined by the combination of spectroscopic and chemical methods, including 1D-, 2D-NMR, and CD spectra as well as by comparing with the NMR data reported in the literature. The cytotoxic activities of all isolated compounds were evaluated on three human cancer cell lines. Compound 3 exhibited moderate to weak cytotoxic activities on three human cancer cell lines, OVCAR, HT-29, and A-549, with IC50 values ranging from 16.2 to 36.4 microM.
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Ngoc TM, Hung TM, Thuong PT, Na M, Kim H, Ha DT, Min BS, Minh PTH, Bae K. Inhibition of human low density lipoprotein and high density lipoprotein oxidation by oligostilbenes from rhubarb. Biol Pharm Bull 2008; 31:1809-12. [PMID: 18758083 DOI: 10.1248/bpb.31.1809] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The objective of the present study was to elucidate the beneficial properties of ampelopsine B (1) and epsilon-Viniferin (2), two oligostilbenes isolated from rhubarb, toward cardiovascular disease by protecting human lipoproteins against lipid peroxidation. In low density lipoprotein (LDL) oxidation, both 1 and 2 exert an inhibitory activity against Cu(2+)-, 2,2'-azobis-(2-amidinopropane) hydrochloride (AAPH)-induced, as exhibited by prolongation of lag time from 52 to 118 and 136 min, respectively, and also increasing the lag time 38 to 105 and 128 min in high density lipoprotein (HDL) oxidation for 1 and 2, respectively, at the concentration of 3.0 microM. In generation of thiobarbituric acid reactive substances (TBARS), compounds 1 and 2 inhibited LDL oxidation mediated by either catalytic Cu(2+) or thermo-labile radical initiator (AAPH) in a dose-dependent manner with IC(50) values of 3.6 and 6.0 microM for 1, and 1.7 and 3.2 microM for 2, respectively. In addition, compounds 1-2 also showed strong ability to protect HDL oxidation induced by both Cu(2+) and AAPH with low IC(50) values. The results suggest that oligostilbenes 1-2 may have a role in preventing lipoprotein oxidation.
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Affiliation(s)
- Tran Minh Ngoc
- College of Pharmacy, Chungnam National University, Daejeon, Korea
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Abstract
Phytochemical study on the ethanol extract of rhubarb led to the isolation of fifteen compounds, including five anthraquinones: chrysophanol (1), physcion (2), emodin (7), chrysophanol-8-O-beta-D: -glucopyranoside (9) and emodin-8-O-beta-D: -glucopyranoside (15), and ten stilbenes: desoxyrhaponticin (3), rhaponticin (4), resveratrol (5), desoxyrhapotigenin (6), rhapontigenin (8), piceatannol-3'-O-beta-D: -glucopyranoside (10), piceid (11), epsilon-viniferin (12), ampelopsin B (13) and isorhaponticin (14). Their structures were identified by comparing the physicochemical data with those of published papers. Among the isolated compounds, stilbene derivatives (3-6, 8 and 10-14) showed remarkable inhibitory effect on lipoxygenase with IC(50) values ranging from 6.7 to 74.1 microM. The inhibition kinetics analyzed by Lineweaver-Burk plots found that they were competitive inhibitors with the linoleic acid at the active site of lipoxygenase. In addition, stilbenes exhibited significantly free radical scavenging activity against ABTS(.+) with trolox equivalent activity capacity (TEAC) values ranging from 1.16 to 4.64. Whereas, anthraquinone derivatives (1-2, 7, 9 and 15) neither inhibited lipoxygenase nor scavenged free radical ABTS(.+). These results indicated that stilbene derivatives were considerate to be mainly lipoxygenase inhibitor and free radical scavenger constituents of rhubarb.
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Affiliation(s)
- Tran Minh Ngoc
- College of Pharmacy, Chungnam National University, Daejeon, 305-764, Korea
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Abstract
A new ent-kaurane diterpenoid (1) was isolated from the leaves of Croton tonkinensis. The structure of 1 was determined as ent-7beta-hydroxy-15-oxokaur-16-en-18-ol from spectroscopic methods.
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Affiliation(s)
- Pham Thi Hong Minh
- Institute of Chemistry, Vietnamese Academy of Science and Technology, 18 Hoang Quoc Viet Rd., Cau Giay, Hanoi, Vietnam
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Minh PTH, Ngoc PH, Quang DN, Hashimoto T, Takaoka S, Asakawa Y. A novel ent-kaurane diterpenoid from the Croton tonkinensis GAGNEP. Chem Pharm Bull (Tokyo) 2003; 51:590-1. [PMID: 12736462 DOI: 10.1248/cpb.51.590] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [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: 11/22/2022]
Abstract
A novel ent-kaurane diterpenoid, ent-1alpha-acetoxy-7beta,14alpha-dihydroxy-kaur-16-en-15-on has been isolated from leaves of Croton tonkinensis GAGNEP. Its structure was determined by a combination of spectroscopy, X-ray crystallographic analysis and the chemical reaction acetylation.
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Affiliation(s)
- Pham Thi Hong Minh
- Institute of Chemistry, National Centre of Natural Sciences and Technology of Vietnam, Hanoi
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