Shimizu K, Ashida H, Matsuura Y, Kanazawa K.
Department of Life Science, Graduate School of Science and Technology, Kobe University, Rokkodai, Nada-ku, Kobe 657-8501, Japan.
Propolis has strong antioxidative activity. We investigated here whether this activity was available in intestinal Caco-2 and hepatic HepG2 cells. Phenolics in Brazilian propolis, extracted with ethyl acetate after the removal of resin and wax with 90% methanol, included artepillin C at 21 mmol/100 g, p-coumaric acid and cinnamic acid relatives 24mmol, kaempferol and its derivatives 9.4 mmol, naringenin 2.8 mmol, isosakuranetin 0.9 mmol, chrysin at 0.8 mmol/100 g, and several minor components. When the extract was added to the apical side of Caco-2 monolayers, artepillin C was specifically incorporated into the cells and released to the basolateral side mostly without conjugation. Then, artepillin C was added to HepG2 cells and exposed to reactive oxygens. Artepillin C prevented oxidative damage dose-dependently, and suppressed lipid peroxidation evaluated with thiobarbituric acid reactive substances by 16% and the formation of 8-hydroxy-2′-deoxyguanosine in DNA by 36% at a concentration of 20microM. Artepillin C is a bioavailable antioxidant.
* THESE STATEMENTS HAVE NOT BEEN EVALUATED BY THE FOOD AND DRUG ADMINISTRATION. THIS IS NOT INTENDED TO DIAGNOSE, TREAT CURE OR PREVENT ANY DISEASE.