• 한국연초학회지
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• 제24권1호
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• pp.7-12
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• 2002

During the screening or antiviral substances having inhibitory effect on tobacco mosaic virus(TMV) infection to tobacco plants, we found that a bacterial isolate, KTB61, which was identified as a Pseudomonas sp., strongly inhibited the formation of TMV local lesions. When the culture filtrate from KTB61 was applied on the upper surface of leaves of N. tabaccum Xanthi-nc tobacco at the same time of or 24 hours before TMV inoculation, almost complete inhibition was achieved. Incidence of systemic TMV infection to the susceptible tobacco cultivar, NC82, was reduced by 95% when TMV was inoculated onto the upper surface of leaves 24 hours after spraying the culture filtrate. Also 75∼80% of inhibitory effect was obtained by the inoculation of TMV onto the under surface of the leaves treated with culture filtrate 24 hours beforehand. In field trials, the TMV infection was reduced by 96.5% when the tobacco seedlings, N. tabaccum cv. NC82, were soaked with culture filtrate before transplanting.

• 한국응용약물학회:학술대회논문집
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• 한국응용약물학회 1998년도 Proceedings of UNESCO-internetwork Cooperative Regional Seminar and Workshop on Bioassay Guided Isolation of Bioactive Substances from Natural Products and Microbial Products
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• pp.188-188
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• 1998

Extracts of 24 edible vegetables were tested concerning their action on in vitro inhibition on dopamine ${\beta}$-hydroxylase (DBH) and monoamine oxidase (MAO). All vegetables were purchased in Korean market and their common names were kept. Radish sprouts, ‘kkoch-na-mul’, ‘chong-gyong-chae’, ragwort, applemint showed strong DBH inhibitory effect when tyramine and crude bovine adrenal DBH were used as substrate and enzyme, respectively. ‘Cham-chwi’(Aster scaber), kale, ‘cham-na-mul’(Pimpinella brachycarpa), leek were found to have MAO-A inhibitory effect with serotonin and crude rat brain MAO-A. Lettuce, ‘chong-gyong-chae’, radish sprouts, beet leaves were found to have MAO-B inhibitory effect with benzyl amine and crude rat liver MAO-B.

• Journal of Applied Biological Chemistry
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• 제50권3호
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• pp.160-163
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• 2007

Two flavonoids (1 and 2) and one phenolic acid (3) obtained from Erigeron annuus have recently been shown to have potent antioxidant activities. Aim of this study was to investigate the inhibitory effects of these components on $interferon-{\gamma}$ and lipopolysaccharide-induced nitric oxide productions in the mouse pheritoneal macrophage. Compounds 2 and 3 showed marked inhibitory activities against inducible nitric oxide synthase (iNOS) on the lipopolysaccharide and $interferon-{\gamma}-stimulated$ mouse pheritoneal macrophages without cytotoxicity. Therefore, these results suggest that the compounds could be effective anti-inflammatory agents as nitric oxide inhibitors in vivo.

• 약학회지
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• 제45권1호
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• pp.93-100
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• 2001

Drug inetraction between of enalapril-induced angiotensin converting enzym) inhibitory effect and Ginkgo biloba Ext.-induced antioxidant action was evaluated in spontaneously hypertensive rats. Combination treatment of enalapril (20 mg/kg/day p.o.) and Ginkgo biloba Ext. (60 mg/kg/day, p.o.) for 6 weeks in drinking water to SHRs resulted the inhibition of ACE activity in lung tissue, angiotensin I-induced pressure response and plasma angiotensin II concentration as similar to enalapril alone treatment. But these effects were sustained after 1 week withdrawal of enalapril and Ginkgo biloba Ext. co-administeration. Also, coadministered group did not increase the concentration of bradykinin in lung tissue, which were different from enalapril alone treated group. Co-administration of enalapril and Ginkgo biloba Ext. inhibited the hemolysis induced by UV B type, even Ginkgo biloba Ext. alone treated group did not. These results suggested that Ginkgo biloba Ext. sustained ACE inhibitory effect and reduced the inhibitory effect of bradykinin inactivation induced by enalapril, meanwhile, enalapril increased the antioxidant effect of Ginkgo biloba Ext.

• Journal of Ginseng Research
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• 제15권2호
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• pp.106-111
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• 1991

This study was devised to obserL'e the inhibitory effects of 7 kinds of ginsenosides on a lipolytic action of Toxohormone-L. The ginsenosides used in this experiment were -Rbl, -Rbl, - Rc, - Re, - Rgl, and - Rg2 prepared from Korean red ginseng. Toxohormene-L was partially purified by centrifigation from the ascites fluids of Sarcoma-180 bearing mice. In vitro test showed that the inhibitory effect of - Rb2 on the lipolysis by Toxohormone-L was highest percent among other treatments at concentration of 100 $\mu\textrm{g}$/ml and 500 $\mu\textrm{g}$/ml of reaction mixture. And total inhibitory activity (units) of - Rb2 was also highest among other treatments at the same concentration. However, in vivo test, body weight gain of Sarcoma-180 bearing mice decreased significantly by administration of - Rg2 compared to those of the control or other ginsenosides treated groups.

• 약학회지
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• 제35권3호
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• pp.165-173
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• 1991

Effects of eight flavonoids and their related compounds on leukocytes migration, superoxide anion production and lipid peroxidation in the phagocytosis of latex beads or E. coli by guinea pig peritoneal exudate cells were studied in vitro. It shows that most of flavonoids generally inhibited the leukocytes migration and production of superoxide anion and malonedialdehydes. Their inhibitory activities in the phagocytosis of latex beads had more active than that of E. coli. Quercetin has the most inhibitory activity in leukocytes migration and production of superoxide anion and lipid peroxides at the concentration of 1, 2 and 10 $\mu{M}$. Catechin and rutin at the concentration of 2 and 10 $\mu{M}$ inhibited significantly the production of superoxide anion and lipid peroxides. Flavone, catechin, naringin and rutin at the concentration of 2 and 10 $\mu{M}$ inhibited significantly the leukocytes migration.

• Archives of Pharmacal Research
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• 제8권2호
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• pp.67-75
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• 1985

To find emylase inhibitors produced by microorganisms from soil, a strain which had a strong inhibitory activity against bacteria .alpha.-amylase was isolated from the soil smaple collected in Seoul. The morphological and physiological characteristics of this strain on several media and its utilization of carbon sources showed that it was one of Streptomyces specties according to the international Streptomyces Project method. The amylase inhibitor of this strain was purified by means of acetone precipitation, adsorption on Amberlite XAD-2, and column chromatography on Amberlite CG-50 and SP-Sephadex C-25. The inhibitor was stable at the pH range of 1-10 and at 100.deg.C for half an hour, and had inhibitory activities against other amylases such as salivary .alpha.-amylase, pancreatic .alpha.-amylase, fungal .alpha.-amylase and glucoamylase. The kinetic studies of the inhibitor showed that its inhibitory effect on starch hydrolysis by .alpha.-amylase was non-competitive.

• Archives of Pharmacal Research
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• 제21권1호
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• pp.67-69
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• 1998

Three TNF-$\alpha$inhibitory lignans were isolated from the flower buds of Magnolia fargesii through bioassay-guided isolation. They were identified as eudesmin, magnolin and lirioresinol-B dimethylether on the basis of their spectroscopic data. All three lignans showed inhibitory effects on TNF-$\alpha$ production in LPS-stimulated murine macrophage cell line, RAW264.7 and eudesmin showed the strongest activity ($IC_{50}=51{\mu}M)$.

• Bulletin of the Korean Chemical Society
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• 제30권1호
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• pp.119-123
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• 2009

Structural modifications were performed on the C-3 and C-28 positions of ursolic acid and oleanolic acid and the NO production inhibitory activities of the resulting derivatives were evaluated. The SAR revealed that the ursolic acid and oleanolic acid derivatives 3a and 4a, which possessing methoxy group at C-3 position exhibit improved NO production inhibitory activity on LPS-induced RAW247 cells while showing less cytotoxicity than the parent compounds.

• Environmental Analysis Health and Toxicology
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• 제17권3호
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• pp.253-259
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• 2002

The phototoxicity inhibitory activity of 15 natural products having antiinflammatory effect was screened by three in vitro methods: yeast growth inhibition test with Candida albicans, RBC photohemolysis and MTT assay. We induced phototoxic reaction by irradiating UVA (365 nm) on chlorpromazine (CPZ) that has been widely documented as phototoxic agent in clinical and experimental studies and then observed the effects of the natural products after treating them with CPZ. In yeast growth inhibition test, X. stramonium showed the inhibitory effect on the UVA phototoxicity and E. officinalis, Yeast, P. suffruticosa showed phototoxicity inhibitory effect in that their ％ hemolysis compared with control were 36.14${\pm}$ 2.69, 42.82${\pm}$1.35, 36.41${\pm}$0.48 on UVA. In MTT assay, all tested natural products increased cell viability compared with the control.