Astilbin, neoastilbin and isoastilbin are three flavonoid isomers from Smilacis glabrae Roxb. (S. glabrae). Several studies have shown that consumption of flavonoids can increase the risk of food/drug–drug interaction by affecting the activities of human cytochrome CYP3A4 and 2D6. In the present study, an ultrahigh‐performance liquid chromatography and triple quadrupole mass spectrometry method was developed for the determination of the interaction between three flavonoid isomers and two CYPs. Under the optimized reaction conditions, the K_m values were 18.9 and 36.4 μM and the V_max values were 0.02 and 0.20 μM/min for CYP3A4 and 2D6 in vitro, respectively. Astilbin showed the strongest inhibition on CYP3A4, followed by isoastilbin and neoastilbin with IC₅₀ values of 2.63, 3.03 and 6.51 μM. Neoastilbin showed the strongest inhibition on CYP2D6, followed by isoastilbin and astilbin, with IC₅₀ values of 1.48, 11.87 and 14.16 μM, respectively. The three isomers showed reversible inhibition on both enzymes. Neoastilbin and astilbin were noncompetitive type for CYP3A4 and 2D6, isoastilbin was a mixture and noncompetitive type for CYP3A4 and 2D6, respectively. Our study suggests that the three isomers may increase the risk of food/drug–drug interactions by affecting the activities of CYP3A4 and 2D6.

中文翻译：

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曲霉菌素，新astastilbin和isoastilbin对人细胞色素CYP3A4和2D6活性的抑制作用

曲霉菌素，新汀和异艾司汀是来自Smilacis glabrae Roxb的三种类黄酮异构体。（S.glabrae）。数项研究表明，食用类黄酮可通过影响人类细胞色素CYP3A4和2D6的活性而增加食品/药品相互作用的风险。在本研究中，开发了一种超高效液相色谱和三重四极杆质谱法，用于测定三种类黄酮异构体与两种CYP之间的相互作用。在最佳反应条件下，体外CYP3A4和2D6的K _m值为18.9和36.4μM，V _max为0.02和0.20μM / min， 分别。落新妇苷显示出对CYP3A4抑制作用最强，其次是isoastilbin和neoastilbin带IC ₅₀为2.63，3.03和6.51μ值中号。Neoastilbin对CYP2D6表现出最强的抑制作用，其次是isoastilbin和astilbin，IC ₅₀值分别为1.48、11.87和14.16μM 。这三种异构体对两种酶均显示出可逆的抑制作用。Neoastilbin和astilbin对CYP3A4和2D6而言是非竞争性类型，isoastilbin对CYP3A4和2D6而言是非竞争性类型。我们的研究表明，这三种异构体可能通过影响CYP3A4和2D6的活性而增加食物/药物相互作用的风险。