lignans and 1-aminobenzotriazole

In order to explore the role of cytochrome P-450 (P-450) in schisandrin B (Sch B)-induced antioxidant and heat shock responses, the effect of 1-aminobenzotriazole (ABT, a broad spectrum inhibitor of P-450) on hepatic mitochondrial glutathione antioxidant status (mtGAS) and heat shock protein (Hsp)25/70 expression was examined in Sch B-treated mice. The non-specific and partial inhibition of cytochrome P-450 (P-450) by ABT pretreatment significantly caused a protraction in the time-course of Sch B-induced enhancement in hepatic mitGAS and Hsp25/70 expression in mice. Using mouse liver microsomes as a source of P-450, Sch B, but not dimethyl diphenyl bicarboxylate (a non-hepatoprotective analog of Sch B), was found to serve as a co-substrate for the P-450-catalyzed NADPH oxidation reaction, with a concomitant production of oxidant species. Taken together, the results suggest that oxidant species generated from P-450-catalyzed reaction with Sch B may trigger the antioxidant and heat shock responses in mouse liver.

Topics: Administration, Oral; Animals; Antioxidants; Cyclooctanes; Cytochrome P-450 Enzyme Inhibitors; Cytochrome P-450 Enzyme System; Dose-Response Relationship, Drug; Enzyme Inhibitors; Female; Heat-Shock Response; Lignans; Liver; Mice; Mice, Inbred BALB C; Microsomes, Liver; Mitochondria, Liver; NADP; Oxidative Stress; Polycyclic Compounds; Schisandraceae; Triazoles