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Lavandulyl flavonoids with sodium-dependent glucose cotransporter 2 inhibitory activity from Sophora flavescens

YANG Jing;WANG Chao;LIN Qinxiong;MEI Zhinan;YANG Guangzhong;YANG Xinzhou;College of Pharmacy,South-Central University for Nationalities;  
To discover new bioactive Sodium-dependent glucose cotransporter 2(SGLT2)inhibitors from the traditional Chinese medicine"Ku Shen"(roots of Sophora flavescens),the bioassay-guided purification of an active ethyl acetate fraction was performed.Sixteen lavandulyl flavonoids were isolated and their structures were elucidated as kushenol H(1),kushenol K(2),kurarinol(3),kushenol Y(4),kushenol P(5),norkurarinone(6),kushenol I(7),kushenol N(8),(-)-kurarinone(9),kushenol X(10),neokurarinol(11),kushenol C(12),sophoraflavanone G(13),leachianone A(14),kuraridine(15)and kushenol A(16).All isolated compounds exhibited inhibitory activity against SGLT2.Among them,the two main constituents of the active EtOAc fraction,(-)-kurarinone(9)and sophoraflavanone G(13)showed the most potential inhibitory activity against SGLT2with the IC50values of 2.24μmol/L and 1.45μmol/L,respectively.
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