title: Expressional studies of the aldehyde oxidase (AOX1) gene during myogenic differentiation in C2C12 cells.
abstract: Aldehyde oxidases (AOXs), which catalyze the hydroxylation of heterocycles and oxidation of a wide variety of aldehydic compounds, have been present throughout evolution from bacteria to humans. While humans have only a single functional aldehyde oxidase (AOX1) gene, rodents are endowed with four AOXs; AOX1 and three aldehyde oxidase homologs (AOH1, AOH2 and AOH3). In continuation of our previous study conducted to identify genes differentially expressed during myogenesis using a microarray approach, we investigated AOX1 with respect to its role in myogenesis to conceptualize how it is regulated in C2C12 cells. The results obtained were validated by silencing of the AOX1 gene. Analysis of their fusion index revealed that formation of myotubes showed a marked reduction of up to 40% in AOX1kd cells. Expression of myogenin (MYOG), one of the marker genes used to study myogenesis, was also found to be reduced in AOX1kd cells. AOX1 is an enzyme of pharmacological and toxicological importance that metabolizes numerous xenobiotics to their respective carboxylic acids. Hydrogen peroxide (H2O2) produced as a by-product in this reaction is considered to be involved as a part of the signaling mechanism during differentiation. An observed reduction in the level of H2O2 among AOX1kd cells confirmed production of H2O2 in the reaction catalyzed by AOX1. Taken together, these findings suggest that AOX1 acts as a contributor to the process of myogenesis by influencing the level of H2O2.
authors.affiliation: School of Biotechnology, Yeungnam University, Gyeongsan 712-749, Republic of Korea.
authors.forename: Majid Rasool
authors.initials: MR
authors.lastname: Kamli
authors.affiliation: School of Biotechnology, Yeungnam University, Gyeongsan 712-749, Republic of Korea.
authors.forename: Jihoe
authors.initials: J
authors.lastname: Kim
authors.affiliation: School of Biotechnology, Yeungnam University, Gyeongsan 712-749, Republic of Korea.
authors.forename: Smritee
authors.initials: S
authors.lastname: Pokharel
authors.affiliation: School of Biotechnology, Yeungnam University, Gyeongsan 712-749, Republic of Korea.
authors.forename: Arif Tasleem
authors.initials: AT
authors.lastname: Jan
authors.affiliation: School of Biotechnology, Yeungnam University, Gyeongsan 712-749, Republic of Korea; Bovine Genome Resources Bank, Yeungnam University, Gyeongsan 712-749, Republic of Korea.
authors.forename: Eun Ju
authors.initials: EJ
authors.lastname: Lee
authors.affiliation: School of Biotechnology, Yeungnam University, Gyeongsan 712-749, Republic of Korea; Bovine Genome Resources Bank, Yeungnam University, Gyeongsan 712-749, Republic of Korea. Electronic address: inhochoi@ynu.ac.kr.
authors.forename: Inho
authors.initials: I
authors.lastname: Choi
mesh_terms: D042931:Aldehyde Oxidase / Q000235:genetics*; D000818:Animals; D015153:Blotting, Western; D002454:Cell Differentiation; D002460:Cell Line; D020868:Gene Silencing; D051379:Mice; D009132:Muscles / Q000166:cytology* / Q000201:enzymology / Q000378:metabolism; D018008:Myogenin / Q000235:genetics; D017382:Reactive Oxygen Species; D060888:Real-Time Polymerase Chain Reaction
chemical_list: C503801:Myog protein, mouse; D018008:Myogenin; D017382:Reactive Oxygen Species; D042931:Aldehyde Oxidase; C493760:Aox1 protein, mouse
keywords: C2C12 cell; Differentiation; Hydrogen peroxide; Myogenesis; Oxidase