Byakangelicin, one of the active compounds found in the roots of Angelica gigas, can serve as a modulator to improve brain accumulation of diverse active compounds (Umb, Cur, and Dox) and enhance therapeutic effects[1]. Byakangelicin is likely to increase the expression of all PXR target genes (such as MDR1) and induce a wide range of drug-drug interactions. Byakangelicin can inhibit the effects of sex hormones, it may increase the catabolism of endogenous hormones[2].
References:
[1]. Kang YY, et al. Byakangelicin as a modulator for improved distribution and bioactivity of natural compounds and synthetic drugs in the brain. Phytomedicine. 2019 May 17;62:152963.
[2]. Yang J, et al. Byakangelicin induces cytochrome P450 3A4 expression via transactivation of pregnane X receptors in human hepatocytes. Br J Pharmacol. 2011 Jan;162(2):441-51.