Nguyen Xuan Cuong
Vietnam Academy of Science and Technology
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Featured researches published by Nguyen Xuan Cuong.
Fitoterapia | 2008
Alessandra Braca; Phan Van Kiem; Pham Hai Yen; Nguyen Xuan Nhiem; Tran Hong Quang; Nguyen Xuan Cuong; Chau Van Minh
Three new monoterpene glycosides named 4-O-methyl-paeoniflorin (1), isopaeoniflorin (2), and isobenzoylpaeoniflorin (3), together with two known monoterpene glycosides, paeoniflorin (4) and benzoylpaeoniflorin (5), were isolated from the roots of Paeonia lactiflora. Their structures were established on the basis of spectral and chemical evidence.
Journal of Natural Products | 2013
Nguyen Phuong Thao; Nguyen Xuan Cuong; Bui Thi Thuy Luyen; Nguyen Van Thanh; Nguyen Xuan Nhiem; Young-Sang Koh; Bui Minh Ly; Nguyen Hoai Nam; Phan Van Kiem; Chau Van Minh; Young Ho Kim
Four new asterosaponins, astrosteriosides A-D (1-3 and 5), and two known compounds, psilasteroside (4) and marthasteroside B (6), were isolated from the MeOH extract of the edible Vietnamese starfish Astropecten monacanthus. Their structures were elucidated by chemical and spectroscopic methods including FTICRMS and 1D and 2D NMR experiments. The effects of the extracts and isolated compounds on pro-inflammatory cytokines were evaluated by measuring the production of IL-12 p40, IL-6, and TNF-α in LPS-stimulated bone marrow-derived dendritic cells. Compounds 1, 5, and 6 exhibited potent anti-inflammatory activity comparable to that of the positive control. Further studies are required to confirm efficacy in vivo and the mechanism of effects. Such potent anti-inflammatory activities render compounds 1, 5, and 6 important materials for further applications including complementary inflammation remedies and/or functional foods and nutraceuticals.
Bioorganic & Medicinal Chemistry Letters | 2010
Nguyen Xuan Cuong; Nguyen Xuan Nhiem; Nguyen Phuong Thao; Nguyen Hoai Nam; Nguyen Tien Dat; Hoang Le Tuan Anh; Le Mai Huong; Phan Van Kiem; Chau Van Minh; Ji Hee Won; Won Yoon Chung; Young Ho Kim
Ten phenolic compounds (1-10) were isolated from a methanol extract of Lawsonia inermis leaves including two new ones, lawsoniasides A (1) and B (2). Their structures were elucidated by spectroscopic methods (NMR and FTICRMS) in combination with acid hydrolysis and GC analyses. Compounds 4 and 5 showed a significant inhibition on receptor activator for nuclear factor-kappaB ligand-induced osteoclast formation in murine bone-marrow macrophages.
Journal of Natural Products | 2009
Nguyen Xuan Cuong; Chau Van Minh; Phan Van Kiem; Hoang Thanh Huong; Ninh Khac Ban; Nguyen Xuan Nhiem; Nguyen Huu Tung; Ji-Won Jung; Hyun-Ju Kim; Shin-Yoon Kim; Jeong Ah Kim; Young Ho Kim
Eight compounds (1-8) were isolated from a methanol extract of Cibotium barometz rhizomes including two new furan derivatives, cibotiumbarosides A (1) and B (2), and a new glycoglycerolipid, cibotiglycerol (4). Their structures were elucidated by chemical and spectroscopic methods. Compounds 2-5 each showed inhibition of osteoclast formation with no affect on BMM cell viability.
Bioorganic & Medicinal Chemistry Letters | 2014
Nguyen Phuong Thao; Bui Thi Thuy Luyen; Nguyen Thi Thanh Ngan; Seok Bean Song; Nguyen Xuan Cuong; Nguyen Hoai Nam; Phan Van Kiem; Young Ho Kim; Chau Van Minh
Four new cembranoid diterpenes lobocrasols A-D (1-4), were isolated from the methanol extract of the soft coral Lobophytum crassum. Their structures were elucidated by spectroscopic analysis and by comparison of the spectroscopic data with those of similar compounds previously reported in literature. The anti-inflammatory effects of isolated compounds were evaluated using NF-κB luciferase and reverse transcription polymerase chain reaction (RT-PCR). Compounds 1 and 2 significantly inhibited TNFα-induced NF-κB transcriptional activity in HepG2 cells in a dose-dependent manner, with IC50 values of 6.30±0.42 and 6.63±0.11μM, respectively. Furthermore, the transcriptional inhibition of these compounds was confirmed by a decrease in cyclooxygenase-2 (COX-2) and inducible nitric oxide synthase (iNOS) gene expression levels in HepG2 cells.
Bioorganic & Medicinal Chemistry Letters | 2013
Nguyen Phuong Thao; Nguyen Hoai Nam; Nguyen Xuan Cuong; Tran Hong Quang; Le Duc Dat; Doobyeong Chae; Sohyun Kim; Young-Sang Koh; Phan Van Kiem; Chau Van Minh; Young Ho Kim
Chemical investigation of the soft coral Sinularia maxima resulted in the isolation of seven norditerpenoids, including two new compounds, 12-hydroxy-scabrolide A (2) and 13-epi-scabrolide C (6). The structures of the isolated compounds were elucidated based on extensive spectroscopic evidence including Fourier transform ion cyclotron resonance mass spectrometry (FTICR-MS) and both one- and two-dimensional nuclear magnetic resonance (1D and 2D NMR, respectively), in comparison with reported data. Compound 6 potently inhibited IL-12 and IL-6 production in LPS-stimulated bone marrow derived dendritic (BMDCs) with IC(50) values of 5.30 ± 0.21 and 13.12 ± 0.64 μM, respectively. Compound 1 exhibited moderate inhibitory activity against IL-12 and IL-6 production with IC(50) values of 23.52 ± 1.37 and 69.85 ± 4.11 μM, respectively.
Fitoterapia | 2010
Phan Van Kiem; Chau Van Minh; Nguyen Tien Dat; La Van Kinh; Dan Thuy Hang; Nguyen Hoai Nam; Nguyen Xuan Cuong; Hoang Thanh Huong; Trinh Van Lau
Phytochemical investigation of the methanol extract of Tinospora cordifolia aerial parts led to the isolation of four new and seven known compounds. The structures of two new aporphine alkaloids, N-formylasimilobine 2-O-beta-D-glucopyranosyl-(1-->2)-beta-D-glucopyranoside (tinoscorside A, 1) and N-acetylasimilobine 2-O-beta-D-glucopyranosyl-(1-->2)-beta-D-glucopyranoside (tinoscorside B, 2), a new clerodane diterpene, tinoscorside C (3), and a new phenylpropanoid, sinapyl 4-O-beta-D-apiofuranosyl-(1-->6)-O-beta-D-glucopyranoside (tinoscorside D, 6) were determined by extensive spectroscopic methods including FTICR-MS and 1D and 2D NMR.
Archives of Pharmacal Research | 2008
Phan Van Kiem; Nguyen Xuan Nhiem; Nguyen Xuan Cuong; Tran Quynh Hoa; Hoang Thanh Huong; Le Mai Huong; Chau Van Minh; Young Ho Kim
By various chromatographic methods, two new phenylpropanoid esters of sucrose named hidropiperosides A (1) and B (2), and three known compounds as vanicosides A (3), B (4), and E (5) were isolated from the methanolic extract of the whole plant of Polygonum hydropiper L. (Polygonaceae). Their structures were elucidated by extensive spectroscopic methods including 1D-and 2D-NMR experiments, as well as ESI-MS analysis. All the isolated compounds were tested for their antioxidant activity in the 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging assay system. Among them, compounds 2 and 3 showed significant antioxidant activity with their SC50 values of 23.4 and 26.7 μg/mL, respectively.
Bioorganic & Medicinal Chemistry Letters | 2011
Phan Van Kiem; Nguyen Xuan Cuong; Nguyen Xuan Nhiem; Vu Kim Thu; Ninh Khac Ban; Chau Van Minh; Bui Huu Tai; Truong Nam Hai; Sang-Hyun Lee; Hae Dong Jang; Young Ho Kim
By bioactive-guided fractionation of methanol extract of the Ficus microcarpa leaves, one new C-glucosylflavone, ficuflavoside (1), one new megastigmane glycoside, ficumegasoside (8), and twelve known compounds including flavonoids (2-6), phenylpropanoids (7), megastigmanes (9-11) and sterol derivatives (12-14) were isolated. Their chemical structures were elucidated by mass, 1D, and 2D NMR spectroscopies. The antioxidant activities of these compounds were measured using the oxygen radical absorbance capacity methods. Compounds 1-6 exhibited potent antioxidant activities of 6.6-9.5μM Trolox equivalents at the concentration of 2.0μM. The results indicated 2, 3, and 5 having meaningful reducing capacity of copper (I) ions concentration of 6.1-8.4μM.
Marine Drugs | 2013
Nguyen Phuong Thao; Nguyen Xuan Cuong; Bui Thi Thuy Luyen; Tran Hong Quang; Tran Thi Hong Hanh; So-Hyun Kim; Young-Sang Koh; Nguyen Hoai Nam; Phan Van Kiem; Chau Van Minh; Young Ho Kim
Inflammation is important in biomedical research, because it plays a key role in inflammatory diseases including rheumatoid arthritis and other forms of arthritis, diabetes, heart disease, irritable bowel syndrome, Alzheimer’s disease, Parkinson’s disease, allergies, asthma, and even cancer. In the present study, we describe the inhibitory effect of crude extracts and steroids isolated from the starfish Astropecten polyacanthus on pro-inflammatory cytokine (Interleukin-12 (IL-12) p40, interleukin-6 (IL-6), and tumor necrosis factor α (TNF-α)) production in lipopolysaccharide (LPS)-stimulated bone marrow-derived dendritic cells (BMDCs). Among those tested, compounds 5 and 7 showed potent inhibitory effects on the production of all three pro-inflammatory cytokines with IC50 values ranging from 1.82 ± 0.11 to 7.00 ± 0.16 μM. Potent inhibitory activities were also observed for compound 1 on the production of IL-12 p40 and IL-6 with values of 3.96 ± 0.12 and 4.07 ± 0.13 μM, respectively, and for compounds 3 and 4 on the production of IL-12 p40 with values of 6.55 ± 0.18 and 5.06 ± 0.16 μM, respectively. Moreover, compounds 2 (IC50 = 34.86 ± 0.31 μM) and 6 (IC50 = 79.05 ± 2.05 μM) exhibited moderate inhibitory effects on the production of IL-12 p40, whereas compounds 3 (IC50 = 22.80 ± 0.21 μM) and 4 (IC50 = 16.73 ± 0.25 μM) moderately inhibited the production of TNF-α and IL-6, respectively.