• Proceedings of the PSK Conference
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• 2002.10a
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• pp.382.2-382.2
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• 2002

Melanin biosynthesis inhibitors are useful not only for the materials used in cosmetics as skin-whitening agents but also for the remedy of hyperpigmentation. In order to find the new skin-whitening compounds from the natural products. screening of tyrosinase and melanin biosynthesis inhibitory activities in vitro has been carried out. The MeOH extracts and/or fractions of Polygoni multiflori Radix, Dalbergiae odoriferae Lignum. Solnani nigri Herba. Polygoni cuspidati Radix. POlygoni multiflori Ramulus. Salviae Radix showed tyrosinase inhibitory effects. Four methanolic extracts also showed melanin biosynthesis inhibitory effects in B-16 melanoma cell line.

• YAKHAK HOEJI
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• v.36 no.2
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• pp.140-149
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• 1992

Anti-allergic action of each water extracts of some crude drugs was investigated in mice and rats. The activity of hyaluronidase which was used in the screening test of anti-allergic action was inhibited significantly by Amomi Semen, Asiasari Radix, Cimicifugae Rhizoma, Cinnamomi Ramulus, Glycyrrhizae Radix and Scutellariae Radix. The 48-hour homologous passive cutaneous anaphylaxis(48-hr PCA) in mouse ear was inhibited significantly by intraperitoneal(i.p.) injection of Amomi Semen, Cimicifugae Rhizoma, and ketotifen, a comparative drug of an anti-allergic action. The increase of vascular permeability induced by histamine or serotonin was inhibited significantly by i.p. injection of Amomi Semen, Cimicifugae Rhizoma, Cinnamomi Ramulus and ketotifen. In rat dorsal skin, the increase of vascular permeability which was induced by histamine, serotonin or compound 48/80 was inhibited significantly by i.p. injection of Amomi Semen, Asiasari Radix, Cimicifugae Rhizoma, Scutellariae Radix and ketotifen. Armeniacae Semen and Liriopis Tuber which had not inhibited hyaluronidase activity did not inhibit 48-hr PCA and the increase of histamine, serotonin or compound 48/80-induced vascular permeability in mice and rats. These results suggest that each water extract of Amomi Semen and Cimicifugae Rhizoma has anti-allergic action.

• YAKHAK HOEJI
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• v.41 no.5
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• pp.565-570
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• 1997

High levels of extracellular phospholipase $A_2$ (Plase $A_2$) associated with inflammatory process in man and animal models have been extensively reported elsew here. Thus, a logical approach to the treatment of inflammatory diseases should involve the inhibitors of Plase $A_2$. To develop new Plase $A_2$ inhibitors from natural products, two hundred crude drugs were screened using group II PLA$A_2$ inhibitory activity. Among them, methanol extract of 5 medicinal plants such as, Raphani Semen, Moutan cortex radicis, Arecae semen, Caryophylli Cortex and Betulae Cortex inhibited more than 90% of PLase $A_2$ activity at a concentration 2.5${\mu}g/ml$. Then, 10 methanol extracts sample were transferred into organic solvents, PLase $A_2$ inhibitory effects were found mainly in CHCl3 and EtoAc fractions.

• Korean Journal of Pharmacognosy
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• v.26 no.2
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• pp.154-158
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• 1995

Twentyfive plant crude drugs with traditional reputation were selected for the antithrombotic screening. MeOH (80%) extract of each plant was given (500 mg/Kg, p.o.) to mice 1 hr prior to the thrombotic challenge (1.8 mg collagen plus 180 ug epinephrine/Kg, i.v.). Seven extracts (1, 2, 8, 10, 18, 22 and 23) showed either comparable or better recovery than aspirin (50 mg/Kg, p.o.) from paralysis caused by the pulmonary thrombosis. 1, 2, 8, 10, 18, 22 and 23 were fractionated to $CH_2Cl_2$ soluble (fr I) and $H_2O$ soluble (fr II) fractions and each fraction (100 mg/Kg, p.o.) was also tested. Mice treated with fr I of 2 (Angelica koreana), 10 (Corydalis spp.) or 23 (Schizonepeta tenuifolia) showed higher recovery and lower mortality rates than aspirin (50 mg/Kg, p.o.) treated mice.

• Asian Pacific Journal of Cancer Prevention
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• v.17 no.1
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• pp.51-55
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• 2016

Phytochemical investigation of Pistacia integerrima has highlighted isolation of two known compounds naringenin (1) and dihydrokaempferol (2). A crude extract and these isolated compounds were here evaluated for their effects on reversion of multidrug resistance (MDR) mediated by P-glycoprotein (P-gp). The multidrug resistance P-glycoprotein is a target for chemotherapeutic drugs from cancer cells. In the present study rhodamine-123 exclusion screening test on human mdr1 gene transfected mouse gene transfected L5178 and L5178Y mouse T-cell lymphoma cells showed excellent MDR reversing effects in a dose dependent manner. In-silico molecular docking investigations demonstrated a common binding site for Rhodamine123, and compounds naringenin and dihydrokaempferol. Our results showed that the relative docking energies estimated by docking softwares were in satisfactory correlation with the experimental activities. Preliminary interaction profile of P-gp docked complexes were also analysed in order to understand the nature of binding modes of these compounds. Our computational investigation suggested that the compounds interactions with the hydrophobic pocket of P-gp are mainly related to the inhibitory activity. Moreover this study s a platform for the discovery of novel natural compounds from herbal origin, as inhibitor molecules against the P-glycoprotein for the treatment of cancer.