PT - JOURNAL ARTICLE AU - Nagano, Taiki AU - Yamao, Shunsuke AU - Terachi, Anju AU - Yarimizu, Hidetora AU - Itoh, Haruki AU - Katasho, Ryoko AU - Kawai, Kosuke AU - Nakashima, Akio AU - Iwasaki, Tetsushi AU - Kikkawa, Ushio AU - Kamada, Shinji TI - <span class="sc">d</span>-amino acid oxidase promotes cellular senescence via the production of reactive oxygen species AID - 10.26508/lsa.201800045 DP - 2019 Feb 01 TA - Life Science Alliance PG - e201800045 VI - 2 IP - 1 4099 - https://www.life-science-alliance.org/content/2/1/e201800045.short 4100 - https://www.life-science-alliance.org/content/2/1/e201800045.full SO - Life Sci. Alliance2019 Feb 01; 2 AB - d-amino acid oxidase (DAO) is a flavin adenine dinucleotide (FAD)–dependent oxidase metabolizing neutral and polar d-amino acids. Unlike l-amino acids, the amounts of d-amino acids in mammalian tissues are extremely low, and therefore, little has been investigated regarding the physiological role of DAO. We have recently identified DAO to be up-regulated in cellular senescence, a permanent cell cycle arrest induced by various stresses, such as persistent DNA damage and oxidative stress. Because DAO produces reactive oxygen species (ROS) as byproducts of substrate oxidation and the accumulation of ROS mediates the senescence induction, we explored the relationship between DAO and senescence. We found that inhibition of DAO impaired senescence induced by DNA damage, and ectopic expression of wild-type DAO, but not enzymatically inactive mutant, enhanced it in an ROS-dependent manner. Furthermore, addition of d-amino acids and riboflavin, a metabolic precursor of FAD, to the medium potentiated the senescence-promoting effect of DAO. These results indicate that DAO promotes senescence through the enzymatic ROS generation, and its activity is regulated by the availability of its substrate and coenzyme.