title: Strong synergistic induction of CYP1A1 expression by andrographolide plus typical CYP1A inducers in mouse hepatocytes.
abstract: The effects of andrographolide, the major diterpenoid constituent of Andrographis paniculata, on the expression of cytochrome P450 superfamily 1 members, including CYP1A1, CYP1A2, and CYP1B1, as well as on aryl hydrocarbon receptor (AhR) expression in primary cultures of mouse hepatocytes were investigated in comparison with the effects of typical CYP1A inducers, including benz[a]anthracene, beta-naphthoflavone, and 2,3,7,8-tetrachlorodibenzo-p-dioxin. Andrographolide significantly induced the expression of CYP1A1 and CYP1A2 mRNAs in a concentration-dependent manner, as did the typical CYP1A inducers, but did not induce that of CYP1B1 or AhR. Interestingly, andrographolide plus the typical CYP1A inducers synergistically induced CYP1A1 expression, and the synergism was blocked by an AhR antagonist, resveratrol. The CYP1A1 enzyme activity showed a similar pattern of induction. This is the first report that shows that andrographolide has a potency to induce CYP1A1 enzyme and indicates that andrographolide could be a very useful compound for investigating the regulatory mechanism of the CYP1A1 induction pathway. In addition, our findings suggest preparing advice for rational administration of A. paniculata, according to its ability to induce CYP1A1 expression.
authors.affiliation: Department of Toxicology, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, 2630 Sugitani, Toyama 930-0194, Japan.
authors.forename: Atika
authors.initials: A
authors.lastname: Jaruchotikamol
authors.forename: Kanokwan
authors.initials: K
authors.lastname: Jarukamjorn
authors.forename: Wanna
authors.initials: W
authors.lastname: Sirisangtrakul
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Sakuma
authors.forename: Yuki
authors.initials: Y
authors.lastname: Kawasaki
authors.forename: Nobuo
authors.initials: N
authors.lastname: Nemoto
mesh_terms: D035685:Andrographis / Q000737:chemistry*; D000818:Animals; D001551:Benz(a)Anthracenes / Q000008:administration & dosage / Q000494:pharmacology; D019363:Cytochrome P-450 CYP1A1 / Q000187:drug effects* / Q000378:metabolism; D003577:Cytochrome P-450 Enzyme System / Q000096:biosynthesis / Q000187:drug effects; D004224:Diterpenes / Q000008:administration & dosage / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D004357:Drug Synergism; D004790:Enzyme Induction; D005786:Gene Expression Regulation / Q000187:drug effects*; D022781:Hepatocytes / Q000201:enzymology; D008297:Male; D051379:Mice; D000072317:Polychlorinated Dibenzodioxins / Q000008:administration & dosage / Q000494:pharmacology; D018336:Receptors, Aryl Hydrocarbon / Q000187:drug effects / Q000378:metabolism; D000077185:Resveratrol; D013267:Stilbenes / Q000494:pharmacology; D019324:beta-Naphthoflavone / Q000008:administration & dosage / Q000494:pharmacology