TY - JOUR T1 - Marmoset Flavin-Containing Monooxygenase 3 in the Liver Is a Major Benzydamine and Sulindac Sulfide Oxygenase JF - Drug Metabolism and Disposition JO - Drug Metab Dispos SP - 497 LP - 500 DO - 10.1124/dmd.117.075184 VL - 45 IS - 5 AU - Shotaro Uehara AU - Makiko Shimizu AU - Yasuhiro Uno AU - Takashi Inoue AU - Erika Sasaki AU - Hiroshi Yamazaki Y1 - 2017/05/01 UR - http://dmd.aspetjournals.org/content/45/5/497.abstract N2 - Common marmosets (Callithrix jacchus) are potentially primate models for preclinical drug metabolism studies because there are similarities in the molecular characteristics of cytochrome P450 enzymes between this species and humans. However, characterization of non–cytochrome P450 enzymes has not been clarified in marmosets. Here, we report characterization of flavin-containing monooxygenases FMO1–FMO5 identified in marmoset tissues. Marmoset FMO forms shared high amino acid sequence identities (93%–95%) and phylogenetic closeness with human homologous FMO forms. FMO1 and FMO3 mRNA were abundantly expressed in the liver and kidneys among five marmoset tissues examined, where FMO3 protein was detected by immunoblotting. FMO inhibition assays using preheated tissue microsomes indicated that benzydamine N-oxygenation and sulindac sulfide S-oxygenation in the marmoset liver was mainly catalyzed by FMO3, the major hepatic FMO. Marmoset FMO3 protein heterologously expressed in Escherichia coli effectively catalyzed benzydamine N-oxygenation and sulindac sulfide S-oxygenation comparable to marmoset liver microsomes. These results indicate that the FMO3 enzyme expressed in marmoset livers mainly metabolizes benzydamine and sulindac sulfide (typical human FMO substrates), suggesting its importance for FMO-dependent drug metabolism in marmosets. ER -