6alpha-Hydroxypolyporenic acid C is a natural product from Wolfiporia cocos (Schw.) Ryv.

To study the absorption of 3-epidehydrotumulosic acid (EDHTA), polyporenic acid C (PPAC) and 6alpha-Hydroxypolyporenic acid C (HPPA) isolated from the sclerotium of Poria cocos. In human intestinal epithelial. METHODS AND RESULTS:By using Caco-2 (the human colonic adenocarcinoma cell lines) cells monolayer as an intestinal epithelial cell model, the permeability of EDHTA, PPAC and 6alpha-Hydroxypolyporenic acid C were studied from apical side (AP side) to basolateral side (BL side) or from BL side to AP side.The P(app) values of EDHTA and PPAC were at a nearly same magnitude with those of propranolol, and 6alpha-Hydroxypolyporenic acid C lied between those of propranolol and atenolol. On the other hand, the efflux transport of EDHTA, PPAC and 6alpha-Hydroxypolyporenic acid C were higher 1.78, 1.91 and 2. 47 times more than its influx transport with 0.56, 0.52 and 0.41 rate of P(app A --> B)/P(app (B --> A). CONCLUSIONS: EDHTA, PPAC and 6alpha-Hydroxypolyporenic acid C can be absorbed across intestinal epithelial cells, among EDHTA and PPAC will be completely. 6alpha-Hydroxypolyporenic acid C will be moderately absorbed compounds. EDHTA, PPAC and 6alpha-Hydroxypolyporenic acid C may have been involved in efflux mechanism in Caco-2 cells monolayers model from the basolateral-to-apical direction.