51
|
Moon HS, Kang SH, Seong JK, Jeong HY, Song KS. Lymphoepithelioma-like gastric carcinoma resected by endoscopic submucosal dissection (ESD). Endoscopy 2010; 42 Suppl 2:E73-4. [PMID: 20195972 DOI: 10.1055/s-0029-1215204] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
|
52
|
Yang EJ, Kim SI, Ku HY, Lee DS, Lee JW, Kim YS, Seong YH, Song KS. Syringin from stem bark of Fraxinus rhynchophylla protects Aβ(25–35)-induced toxicity in neuronal cells. Arch Pharm Res 2010; 33:531-8. [DOI: 10.1007/s12272-010-0406-z] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2009] [Revised: 01/19/2010] [Accepted: 02/05/2010] [Indexed: 01/03/2023]
|
53
|
Jang JH, Kim CY, Lim SH, Yang CH, Song KS, Han HS, Lee HK, Lee J. Neuroprotective effects of Triticum aestivum L. against beta-amyloid-induced cell death and memory impairments. Phytother Res 2010; 24:76-84. [PMID: 19441012 DOI: 10.1002/ptr.2871] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
beta-Amyloid (A beta) is a key component of senile plaques, neuropathological hallmarks of Alzheimer's disease (AD) and has been reported to induce cell death via oxidative stress. This study investigated the protective effects of Triticum aestivum L. (TAL) on A beta-induced apoptosis in SH-SY5Y cells and cognitive dysfunctions in Sprague-Dawley (SD) rats. Cells treated with A beta exhibited decreased viability and apoptotic features, such as DNA fragmentation, alterations in mitochondria and an increased Bax/Bcl-2 ratio, which were attenuated by TAL extract (TALE) pretreatment. To elucidate the neuroprotective mechanisms of TALE, the study examined A beta-induced oxidative stress and cellular defense. TALE pretreatment suppressed A beta-increased intracellular accumulation of reactive oxygen species (ROS) via up-regulation of glutathione, an essential endogenous antioxidant. To further verify the effect of TALE on memory impairments, A beta or scopolamine was injected in SD rats and a water maze task conducted as a spatial memory test. A beta or scopolamine treatment increased the time taken to find the platform during training trials, which was decreased by TALE pretreatment. Furthermore, one of the active components of TALE, total dietary fiber also effectively inhibited A beta-induced cytotoxicity and scopolamine-caused memory deficits. These results suggest that TALE may have preventive and/or therapeutic potential in the management of AD.
Collapse
|
54
|
Azad MAK, Bae JH, Kim JS, Lim JK, Song KS, Shin BS, Kim HR. Isolation and characterization of a novel thermostable α-amylase from Korean pine seeds. N Biotechnol 2009; 26:143-9. [DOI: 10.1016/j.nbt.2009.09.006] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2009] [Revised: 07/31/2009] [Accepted: 09/09/2009] [Indexed: 10/20/2022]
|
55
|
Nguyen TTH, Cho SO, Ban JY, Kim JY, Ju HS, Koh SB, Song KS, Seong YH. Neuroprotective effect of Sanguisorbae radix against oxidative stress-induced brain damage: in vitro and in vivo. Biol Pharm Bull 2009; 31:2028-35. [PMID: 18981568 DOI: 10.1248/bpb.31.2028] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Sanguisorbae radix (SR), the root of Sanguisorba officinalis L. (Rosaceae), has been traditionally used for its anti-inflammatory, anti-infectious and analgesic activities in Korea. Previous work has shown that SR prevents neuronal cell damage induced by Abeta (25--35) in cultured rat cortical neurons. The present study was carried out to further investigate the neuroprotective effect of SR on oxidative stress-induced toxicity in primary culture of rat cortical neurons, and on ischemia-induced brain damage in rats. SR, over a concentration range of 10--50 microg/ml, inhibited H2O2 (100 microM)-induced neuronal death, which was significantly inhibited by MK-801 (5 microM), an N-methyl-D-aspartate (NMDA) receptor antagonist, and verapamil (20 microM), an L-type Ca2+ channel blocker. Pretreatment of SR (10-50 microg/ml), MK-801 (5 microM), and verapamil (20 microM) inhibited H2O2-induced elevation of intracellular Ca2+ concentration ([Ca2+]i) measured by a fluorescent dye, Fluo-4 AM. SR (10-50 microg/ml) inhibited H2O2-induced glutamate release into medium measured by HPLC, and generation of reactive oxygen species (ROS) measured by 2',7'-dichlorodihydrofluorescein diacetate (H2DCFDA). In vivo, SR prevented cerebral ischemic injury induced by 2-h middle cerebral artery occlusion (MCAO) and 24-h reperfusion. The ischemic infarct and edema were significantly reduced in rats that received SR (10, 30 mg/kg, orally), with a corresponding improvement in neurological function. Catechin isolated from SR inhibited H2O2-induced neuronal death in cultures. Taken together, these results suggest that SR inhibits H2O2-induced neuronal death by interfering with the increase of [Ca2+]i, and inhibiting glutamate release and generation of ROS, and that the neuroprotective effect of SR against focal cerebral ischemic injury is due to its anti-oxidative effects. Thus SR might have therapeutic roles in neurodegenerative diseases such as stroke.
Collapse
|
56
|
Cho SO, Ban JY, Kim JY, Jeong HY, Lee IS, Song KS, Bae K, Seong YH. Aralia cordata Protects Against Amyloid β Protein (25–35)–Induced Neurotoxicity in Cultured Neurons and Has Antidementia Activities in Mice. J Pharmacol Sci 2009; 111:22-32. [DOI: 10.1254/jphs.08271fp] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
|
57
|
Hwang SL, Kim HN, Jung HH, Kim JE, Choi DK, Hur JM, Lee JY, Song H, Song KS, Huh TL. Beneficial effects of beta-sitosterol on glucose and lipid metabolism in L6 myotube cells are mediated by AMP-activated protein kinase. Biochem Biophys Res Commun 2008; 377:1253-8. [PMID: 18992226 DOI: 10.1016/j.bbrc.2008.10.136] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2008] [Accepted: 10/28/2008] [Indexed: 11/26/2022]
Abstract
AMP-activated protein kinase (AMPK) is an energy-sensing enzyme that has been implicated as a key factor for controlling intracellular lipids and glucose metabolism. Beta-sitosterol, a plant sterol known to prevent cardiovascular disease was identified from Schizonepeta tenuifolia to an AMPK activator. In L6 myotube cells, beta-sitosterol significantly increased phosphorylation of the AMPKalpha subunit and acetyl-CoA carboxylase (ACC) with stimulating glucose uptake. In contrast, beta-sitosterol treatment reduced intracellular levels of triglycerides and cholesterol in L6 cells. These effects were all reversed by pretreatment with AMPK inhibitor Compound C or LKB1 destabilizer radicicol. Similarly, beta-sitosterol-induced phosphorylation of AMPK and ACC was not increased in HeLa cells lacking LKB1. These results together suggest that beta-sitosterol-mediated enhancement of glucose uptake and reduction of triglycerides and cholesterol in L6 cells is predominantly accomplished by LKB1-mediated AMPK activation. Our findings further reveal a molecular mechanism underlying the beneficial effects of beta-sitosterol on glucose and lipid metabolism.
Collapse
|
58
|
Kang SH, Kim JI, Moon HS, Kang HM, Kim SH, Seong JK, Lee BS, Jeong HY, Song KS, Noh SM, Shin KS, Cho JS. Overt bone marrow metastasis from early gastric cancer. Endoscopy 2008; 40 Suppl 2:E34-5. [PMID: 18278722 DOI: 10.1055/s-2007-966860] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
|
59
|
Kim MY, Yi JH, Hwang YY, Song KS, Jun MR. Isolation and Identification of Antioxidant Substances from the Stems of Butterbur (Petasites japonicus). ACTA ACUST UNITED AC 2008. [DOI: 10.3746/jkfn.2008.37.8.979] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
60
|
Lv L, Yang QY, Zhao Y, Yao CS, Sun Y, Yang EJ, Song KS, Mook-Jung I, Fang WS. BACE1 (beta-secretase) inhibitory chromone glycosides from Aloe vera and Aloe nobilis. PLANTA MEDICA 2008; 74:540-545. [PMID: 18543151 DOI: 10.1055/s-2008-1074496] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Four new chromone glycosides allo-aloeresin D (2) , C-2'-decoumaroyl-aloeresin G (8), 2'-O-coumaroyl-(S)-aloesinol (9), 2'-O-[ P-methoxy-(E)-cinnamoyl]-(S)-aloesinol (10) and nine known chromone glycosides ( 1, 3 - 7, 11 - 13) were isolated from two Aloe spp. plants, A. vera and A. nobilis. Among them, 1 and 8 showed significant inhibitory activity against BACE1 (beta-secretase) with IC (50) values of 39.0 and 20.5 x 10 (-6) M, as well as inhibition of Abeta (1-42) production by 7.4 and 12.3 %, respectively, in B103 neuroblastoma cells at 30 ppm. The preliminary structure-activity relationships of ALOE chromone glucosides were also discussed.
Collapse
|
61
|
Choi SH, Hur JM, Yang EJ, Jun M, Park HJ, Lee KB, Moon E, Song KS. Beta-secretase (BACE1) inhibitors from Perilla frutescens var. acuta. Arch Pharm Res 2008; 31:183-7. [PMID: 18365688 DOI: 10.1007/s12272-001-1139-9] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
In the course of screening for anti-dementia agents from natural products, two beta-secretase (BACE1) inhibitors were isolated from the methanolic extract of Perilla frutescens var. acuta and identified as luteolin (1) and rosmarinic acid (2) with IC50 values of 5.0 x 10(-7) M and 2.1 x 10(-5) M, respectively. They inhibited BACE1 in a non-competitive manner with a substrate in Dixon plots, suggesting that they might bind to either beta-secretase subsite or to another regulatory site. Kivalues of 1 and 2 were 6.2 x 10(-5) M and 3.9 x 10(-5) M, respectively. They were less inhibitory against other enzymes such as alpha-secretase (TACE), acetylcholine esterase (AchE), chymotrypsin, and elastase, indicating that they were relatively specific inhibitors of BACE1.
Collapse
|
62
|
Ban JY, Nguyen HTT, Lee HJ, Cho SO, Ju HS, Kim JY, Bae K, Song KS, Seong YH. Neuroprotective Properties of Gallic Acid from Sanguisorbae Radix on Amyloid .BETA. Protein (25-35)-Induced Toxicity in Cultured Rat Cortical Neurons. Biol Pharm Bull 2008; 31:149-53. [DOI: 10.1248/bpb.31.149] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
63
|
Ban JY, Cho SO, Choi SH, Ju HS, Kim JY, Bae K, Song KS, Seong YH. Neuroprotective Effect of Smilacis chinae Rhizome on NMDA-Induced Neurotoxicity In Vitro and Focal Cerebral Ischemia In Vivo. J Pharmacol Sci 2008; 106:68-77. [DOI: 10.1254/jphs.fp0071206] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
|
64
|
Hur JM, Kwon SH, So JH, Jun M, Kang YH, Lee YM, Lee KB, Rhee IK, Lee MS, Song KS. Changes in aurantio-obtusin and glucoaurantio-obtusin content in Cassiae Semen via treatment with a crude enzyme extract from Aspergillus usamii. J Microbiol Biotechnol 2007; 17:1894-1897. [PMID: 18092478] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Cassiae Semen (seeds of Cassia tora) showed a remarkably different HPLC chromatogram after being treated with a crude enzyme extract from Aspergillus usamii. Increased and decreased compounds were identified as aurantio-obtusin and glucoaurantio-obtusin, respectively. The aurantio-obtusin content reached its maximum level (133.58 +/- 0.39 microg/mg extract) after being incubated for 50 min at 37 degrees C, whereas the inactivated crude enzyme-treated control remained unchanged (54.13 +/- 1.33 microg/mg). On the other hand, the glucoaurantio-obtusin content decreased by less than one-third (51.09 +/- 1.63 microg/ mg) of the untreated control (143.19 +/- 2.12 microg/mg), suggesting that an increase in aurantio-obtusin content originated from the enzymatic cleavage of its glucoside glucoaurantio-obtusin.
Collapse
|
65
|
Shim JK, Ha DM, Nho SK, Song KS, Lee KY. Upregulation of heat shock protein genes by envenomation of ectoparasitoid Bracon hebetor in larval host of Indian meal moth Plodia interpunctella. J Invertebr Pathol 2007; 97:306-9. [PMID: 17981295 DOI: 10.1016/j.jip.2007.10.001] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2006] [Revised: 09/18/2007] [Accepted: 10/01/2007] [Indexed: 10/22/2022]
Abstract
Effect of envenomation of ectoparasitoid Bracon hebetor was determined on the heart rate and the expression of shsp, hsc70 and hsp90 of the lepidopteran host Plodia interpunctella. Envenomated host larvae were promptly immobilized but heart rate was not changed until 4 days after envenomation. Northern hybridization showed that each hsp gene was differentially influenced by envenomation: continued high induction of shsp, gradual strong induction of hsc70, but no induction of hsp90. Our results suggest that upregulation of both shsp and hsc70 may produce potent factors that have important roles in the mechanism of host-parasitoid relationship.
Collapse
|
66
|
Thuong PT, Kang HJ, Na M, Jin W, Youn UJ, Seong YH, Song KS, Min BS, Bae K. Anti-oxidant constituents from Sedum takesimense. PHYTOCHEMISTRY 2007; 68:2432-8. [PMID: 17658562 DOI: 10.1016/j.phytochem.2007.05.031] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2007] [Revised: 03/17/2007] [Accepted: 05/16/2007] [Indexed: 05/16/2023]
Abstract
As part of an ongoing search for antioxidants from medicinal plants, 14 phenolic constitutents were isolated from the Korean endemic species Sedum takesimense Nakai. Their structures were determined as 1-(4-hydroxyphenyl)-2-(3,5-dihydroxyphenyl)-2-hydroxyethanone (5), gossypetin-8-O-beta-d-xylopyranoside (10), and 2,6-di-O-galloylarbutin (13) on the basis of spectroscopic analyses (IR, UV, 1D and 2D NMR, HR-MS) and chemical degradation, together with 11 previously known phenolics. Two of those (10 and 13) exhibited strong scavenging activities against DPPH and superoxide radicals as well as significant inhibitory effects on lipid peroxidation (IC(50) 14.0 and 10.8 microM, respectively) and LDL oxidation induced by a metal ion Cu(2+) (IC(50) 5.7 and 3.3 microM, respectively).
Collapse
|
67
|
Chen QC, Lee J, Jin W, Youn U, Kim H, Lee IS, Zhang X, Song K, Seong Y, Bae K. Cytotoxic constituents from angelicae sinensis radix. Arch Pharm Res 2007; 30:565-9. [PMID: 17615675 DOI: 10.1007/bf02977650] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Cytotoxic bioassay-guided fractionation of methanol extract of Angelicae Sinensis Radix led to the isolation of a new dimeric Z-ligustilide, named neodiligustilide (1), together with three known compounds, Z-ligustilide (2), 11(S),16(R)-dihydroxy-octadeca-9Z, 17-dien-12,14-diyn-1-yl acetate (3), and 3(R),8(S)-falcarindiol (4). Among them, 2 showed the strongest cytotoxicity against L1210 and K562 cell lines with IC50 values of 2.27 +/- 0.10 and 4.78 +/- 0.18 microM, respectively, while 1 showed moderate cytotoxicity with IC50 values of 5.45 +/- 0.19 and 9.87 +/- 0.14 microM. Two polyacetylenes, 3 and 4, showed cytotoxicity only against L1210 cell line with IC50 values of 2.60 +/- 0.90 and 2.87 +/- 0.49 microM, respectively.
Collapse
|
68
|
Lee SH, Jun M, Choi JY, Yang EJ, Hur JM, Bae K, Seong YH, Huh TL, Song KS. Plant phenolics as prolyl endopeptidase inhibitors. Arch Pharm Res 2007; 30:827-33. [PMID: 17703733 DOI: 10.1007/bf02978832] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Prolyl endopeptidase (PEP, EC 3.4.21.26), a serine protease, is widely distributed in various organs, particularly in the brains of Alzheimer's disease patients. The expression of PEP in Alzheimer's patients has been found to be significantly higher than that of the normal person, suggesting that a specific PEP inhibitor can be a good candidate for an anti-amnestic drug. In the current study, thirty-nine plant phenolics were investigated to determine their roles as prolyl endopeptidase (PEP) inhibitors. Nineteen compounds such as 1,2,3-trigalloyl glucopyranoside, 1,2,6-trigalloyl glucopyranoside, 1,2,3,4,6-pentagalloyl gluco-pyranoside, 1,2,6-trigalloyl alloside, 1,3,6-trigalloyl alloside, 1,2,3,6-tetragalloyl alloside, acetonyl geraniin, corilagin, elaeocarpusin, euphorscopin, geraniin, helioscopin B, helioscopinin A, helioscopinin B, jolkinin, macranganin, rugosin E, supinanin, and teracatain exhibited strong inhibition against PEP (IC50 26.7 - 443.7 x 10(-9) M). Rugosin E (IC50 26.7 x 10(-9) M) showed the most effective inhibition followed by 1,2,6-trigalloyl glucopyranoside (IC5031.4 x 10(-9) M) and macranganin (IC5042.6 x 10(-9) M). No significant structure-activity relationship was found; however, at least, three pyrogallol groups seem to be a minimal requirement for stronger activity against PEP All 19 active compounds inhibited PEP in a non-competitive mode with a substrate in Dixon plots. They did not show significant effects against other serine proteases such as trypsin, chymotrypsin and elastase, indicating that they were relatively specific PEP inhibitors.
Collapse
|
69
|
Yoo YC, Shin BH, Hong JH, Lee J, Chee HY, Song KS, Lee KB. Isolation of fatty acids with anticancer activity from Protaetia brevitarsis larva. Arch Pharm Res 2007; 30:361-5. [PMID: 17424944 DOI: 10.1007/bf02977619] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
In this study, biologically active compounds were isolated from Protaetia brevitarsis larva (PBL) by dichloromethane extraction. The dichloromethane extract from PBL was highly cytotoxic to various cancer cells. From a silica gel column chromatograpy of this extract, we obtained four fractions (F-2, F-4, F-5 and F-7) having apoptosis-inducing activity. These fractions induced DNA ladder and caspase-3 activation during apoptosis in colon 26 tumor cells. In 1H and 13C NMR and mass spectral analysis of the fraction F-2 showing the highest apoptosis-inducing activity, we found that the fraction was composed of three free fatty acids such as palmitic acid, (Z)-9-octadecenoic acid and octadecenoic acid. These results indicate that the dichloromethane extract of PBL includes anticancer components composed of at least three fatty acids, and apoptosis-inducing activity of the extract was mediated by caspase-3 activation in tumor cells.
Collapse
|
70
|
Ban JY, Cho SO, Jeon SY, Bae K, Song KS, Seong YH. 3,4-Dihydroxybenzoic acid from Smilacis chinae rhizome protects amyloid β protein (25–35)-induced neurotoxicity in cultured rat cortical neurons. Neurosci Lett 2007; 420:184-8. [PMID: 17531386 DOI: 10.1016/j.neulet.2007.05.009] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2007] [Revised: 05/02/2007] [Accepted: 05/04/2007] [Indexed: 01/14/2023]
Abstract
The neuroprotective effect of 3,4-dihydroxybenzoic acid (3,4-DHBA) isolated from Smilacis chinae rhizome against Abeta (25-35)-induced neurotoxicity on cultured rat cortical neurons was found in this study. The protective effect of 3,4-DHBA against Abeta (25-35)-induced neuronal cell death was investigated by measuring cell viability via a 3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyl-tetrazolium bromide (MTT) assay and Hoechst 33342 staining. 3,4-DHBA (1 and 10 microM) concentration-dependently inhibited 10 microM Abeta (25-35)-induced neuronal apoptotic death. 3,4-DHBA (1 and 10 microM) inhibited 10 microM Abeta (25-35)-induced elevation of cytosolic Ca(2+) concentration ([Ca(2+)](c)), which was measured by a fluorescent dye, Fluo-4 AM. 3,4-DHBA also inhibited glutamate release into medium, reactive oxygen species (ROS) generation, and caspase-3 activation, which were induced by 10 microM Abeta (25-35). These results suggest that 3,4-DHBA prevents Abeta (25-35)-induced neuronal cell damage by interfering with the increase of [Ca(2+)](c), and then by inhibiting glutamate release, generation of ROS and caspase-3 activity.
Collapse
|
71
|
Zhang X, Hung TM, Phuong PT, Ngoc TM, Min BS, Song KS, Seong YH, Bae K. Anti-inflammatory activity of flavonoids from Populus davidiana. Arch Pharm Res 2007; 29:1102-8. [PMID: 17225458 DOI: 10.1007/bf02969299] [Citation(s) in RCA: 93] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
An in vitro bioassay-guide revealed that the methanol (MeOH) extract of the stem bark of Populus davidiana showed considerable inhibitory activity against cyclooxygenase (COX-1, COX-2). Continuous phytochemical study of the MeOH extract of this plant led to the isolation of ten flavonoids; sakuranetin (1), rhamnocitrin (2), 7-O-methylaromadendrin (3), naringenin (4), eriodictyol (5), aromadendrin (6), kaempferol (7), neosakuranin (8), sakuranin (9) and sakurenetin-5,4'-di-beta-D-glucopyranoside (10). Their structures were identified on the basis of their physicochemical and spectroscopic analyses. The isolated compounds, 1-10, were tested for their inhibitory activities against COX-1 and COX-2. Compound 7 was found to have potent inhibitory effect on COX-1 and a moderate effect on COX-2, meanwhile, compounds 1-6 showed moderate inhibition against COX-1 only. Moreover, compounds 5-8 exhibited suppressive effects on xanthine oxidase (XO). These results may explain, in part, the traditional uses of P. davidiana in ethnomedicine.
Collapse
|
72
|
Ban JY, Jeon SY, Nguyen TTH, Bae K, Song KS, Seong YH. Neuroprotective effect of oxyresveratrol from smilacis chinae rhizome on amyloid Beta protein (25-35)-induced neurotoxicity in cultured rat cortical neurons. Biol Pharm Bull 2007; 29:2419-24. [PMID: 17142975 DOI: 10.1248/bpb.29.2419] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We previously reported that Smilacis chinae rhizome inhibits amyloid beta protein (25-35) (Abeta (25-35))-induced neurotoxicity in cultured rat cortical neurons. The present study evaluated the neuroprotective effect of oxyresveratrol isolated from Smilacis chinae rhizome against Abeta (25-35)-induced neurotoxicity on cultured rat cortical neurons. Oxyresveratrol over the concentration range of 1-10 microM significantly inhibited 10 microM Abeta (25-35)-induced neuronal cell death, which was measured by a 3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyl-tetrazolium bromide (MTT) assay and Hoechst 33342 staining. Oxyresveratrol (10 microM) inhibited 10 microM Abeta (25-35)-induced elevation of cytosolic calcium concentration ([Ca2+]c), which was measured by a fluorescent dye, Fluo-4 AM. Oxyresveratrol (1, 10 microM) also inhibited glutamate release into medium and reactive oxygen species (ROS) generation induced by 10 microM Abeta (25-35). These results suggest that oxyresveratrol prevents Abeta (25-35)-induced neuronal cell damage by interfering with the increase of [Ca2+]c, and then by inhibiting glutamate release and ROS generation. Furthermore, these effects of oxyresveratrol may be associated with the neuroprotective effect of Smilacis chinae rhizome.
Collapse
|
73
|
Kang HM, Kang YS, Kim SH, Seong JK, Lee BS, Jeong HY, Lee HY, Song KS. Single filiform polyp in asymptomatic healthy Korean without history of inflammatory bowel disease. Endoscopy 2007; 39 Suppl 1:E333-4. [PMID: 18273783 DOI: 10.1055/s-2007-966801] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
|
74
|
Jin W, Min BS, Lee J, Thuong PT, Lee HK, Song K, Seong YH, Bae K. Isolation of constituents and anti-complement activity fromAcer okamotoanum. Arch Pharm Res 2007; 30:172-6. [PMID: 17366738 DOI: 10.1007/bf02977691] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
A novel acylated sterol glucoside (1) along with four known compounds, beta-amyrin acetate (2), 3beta,24-dihydroxytaraxer-14-ene (3), cleomiscosin A (4), and cleomiscosin C (5), were isolated from the leaf and twig of Acer okamotoanum Nakai (Aceraceae). The structure of the new compound was determined to be beta-sitosterol glucoside-3'-O-hexacosanoicate based on chemical and spectroscopic analyses. In addition, the novel compound was found to exhibit a significant inhibitory effect (IC50 value of 0.2 microM) on the complement system activated by the classical pathway.
Collapse
|
75
|
Zhang X, Thuong PT, Min BS, Ngoc TM, Hung TM, Lee IS, Na M, Seong YH, Song KS, Bae K. Phenolic glycosides with antioxidant activity from the stem bark of Populus davidiana. JOURNAL OF NATURAL PRODUCTS 2006; 69:1370-3. [PMID: 16989539 DOI: 10.1021/np060237u] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Phytochemical study on the EtOAc-soluble fraction of the stem bark of Populus davidiana resulted in the isolation of 10 phenolic glycosides (1-10), which were identified on the basis of physicochemical and spectroscopic analyses. Among these, three new compounds, populosides A-C (1-3), were determined to be 2-coumaroylmethyl-4-hydroxyphenyl-beta-D-glucopyranoside, 2-coumaroylmethylphenyl-beta-D-glucopyranoside, and 2-feruoylmethylphenyl-beta-D-glucopyranoside, respectively. Compounds 1-10 were tested for their radical scavenging activity against an azo radical, ABTS*+. Of these, populosides A-C (1-3), populoside (4), grandidentatin (8), salireposide (9), and coumaroyl-beta-D-glucoside (10) exhibited antioxidant activity in this assay.
Collapse
|