title: Cortisone and dexamethasone inhibit myogenesis by modulating the AKT/mTOR signaling pathway in C2C12.
abstract: Myogenesis occurs in both the prenatal and postnatal periods and the prenatal myogenesis is related to the postnatal myogenesis and the incidence of disease later in life. Glucocorticoids used as therapeutic agents for many diseases, but cause adverse effects on muscle homeostasis, including defects in fetal muscle development. The action of glucocorticoids on differentiated skeletal muscle was well studied, but their effects on myotube formation have not been well investigated. Dexamethasone (DEX) and cortisone (COR), two synthetic therapeutic glucocorticoids, suppress myotube formation in C2C12 cells. Both COR and DEX attenuated myotube formation through modulation of myogenic regulatory factors. In addition, they affected the IGF/PI3K/AKT/mTOR signaling pathway, resulting in increased proteolytic protein (atrogin-1 and MURF1) for muscle degradation and decreased ribosomal S6 phosphorylation. The current results conclude that COR and DEX inhibit myotube formation in C2C12 cells by modulating both the myogenic program via MRFs and protein metabolism via IGF/PI3K/AKT/mTOR signaling pathway.
authors.affiliation: a Department of Biotechnology , Korea University , Seoul , Republic of Korea.
authors.forename: Jonggun
authors.initials: J
authors.lastname: Kim
authors.affiliation: a Department of Biotechnology , Korea University , Seoul , Republic of Korea.
authors.forename: Min Young
authors.initials: MY
authors.lastname: Park
authors.affiliation: a Department of Biotechnology , Korea University , Seoul , Republic of Korea.
authors.forename: Hyung Kwan
authors.initials: HK
authors.lastname: Kim
authors.affiliation: b Department of Food Science , University of Massachusetts , Amherst , MA , United States.
authors.forename: Yeonhwa
authors.initials: Y
authors.lastname: Park
authors.affiliation: a Department of Biotechnology , Korea University , Seoul , Republic of Korea.
authors.forename: Kwang-Youn
authors.initials: KY
authors.lastname: Whang
keywords: C2C12; cortisone; dexamethasone; glucocorticoid; myogenesis