TY - JOUR T1 - Thalidomide-induced Suppression of Embryo Fibroblast Proliferation Requires CYP1A1-Mediated Activation JF - Drug Metabolism and Disposition JO - Drug Metab Dispos SP - 469 LP - 475 DO - 10.1124/dmd.31.4.469 VL - 31 IS - 4 AU - Masaaki Miyata AU - Etsuko Tamura AU - Kazuko Motoki AU - Kiyoshi Nagata AU - Yasushi Yamazoe Y1 - 2003/04/01 UR - http://dmd.aspetjournals.org/content/31/4/469.abstract N2 - An enzyme involved in the metabolic activation of thalidomide has been investigated using embryo fibroblast proliferation as a marker. Thalidomide (30 μM) induced-suppression of embryo fibroblast proliferation was detected in the presence of liver microsomes from rabbit but not from mouse. The addition of a selective inhibitor of CYP1A, α-naphthoflavone (4 μM), or furafylline (4 μM), to the incubation mixture abolished the thalidomide-induced suppression. Furthermore, addition of anti-rat CYP1A1 antibody also resulted in inhibition of suppression. The thalidomide-induced suppression was also observed with the microsomal system from human HepG2 cells pretreated with 3-methylcholanthrene (10 μM) but not from those pretreated with the vehicle. Both CYP1A1 and CYP1A2 proteins were detected in the rabbit liver microsomes by immunoblot analyses, but only CYP1A2 protein was detected in the mouse liver microsomes. In addition, CYP1A1 protein was detected in microsomes from HepG2 cells pretreated with 3-methylcholanthrene but not with the vehicle. These results strongly suggest the involvement of CYP1A1 in the thalidomide-induced suppression of embryo fibroblast proliferation. The American Society for Pharmacology and Experimental Therapeutics ER -