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PRENYLATED FLAVANONES FROM DERRIS LAXIFLORA
KIM, YOUNG HO,LEE, EUNG-SEOK,KOONCHANOK, NUPHAVAN M.,GEAHLEN, ROBERT L.,ASHENDEL, CURTIS L.,CHANG, CHING-JER 영남대학교 약품개발연구소 1995 영남대학교 약품개발연구소 연구업적집 Vol.5 No.-
A new prenylated flavanone 1 [laxiflorin (2S)-5, 7, 3', 4'-tetrahydroxy-6-(β-hydroxyethyl)-8-(γ, γ-dimethylallyl)flavanone] and four known flavanones (6, 8-diprenyleriodictyol, hiravanone, senegalensein and lupinifolin) were isolated from the leaves and twigs of Derris laxiflora.. Laxiflorin with a β-hydroxyethyl group at C-6 exhibited significant inhibitory activity against protein-tyrosine kinase.
KINASE INHIBITORS FROM POLYGONUM CUSPIDATUM
JAYATILAKE, GAMINI S.,JAYASURIYA, HIRANTHI,LEE, EUNG-SEOK,KOONCHANOK, NUPHAVAN MO.,GEAHLEN, ROBERT L.,ASHENDEL, CURTIS L.,MCLAUCHLIN, JERRY L.,CHANG, CHING-JER 영남대학교 약품개발연구소 1994 영남대학교 약품개발연구소 연구업적집 Vol.4 No.-
Bioassay-directed fractionation of a medicinal plant, Polygonum cuspidatum (Polygonaceae), has led to the discovery of a hydroxystilbene, resveratrol [1], as an inhibitor of a protein-tyrosine kinase (p56^(lck)) partially purified from bovine thymus. Both trans and cis isomers of resveratrol possess comparable protein-tyrosine kinase inhibitory activity. Comparison of the IC_(50) values of resveratrol for protein-tyrosine kinase inhibitory activity with those of piceid (resveratrol-O³-β-glucoside) [2] and resveratrol-O⁴-β-glucoside [3] shows the requirement of free hydroxyl groups on both phenyl rings for the protein-tyrosine kinase inhibition. Protein kinase C inhibitory analysis suggests the requirements of two free hydroxyl groups on one phenyl ring only.