Cofilin Phosphorylation Decreased by Serum-free Starvation with Low Glucose in the L6 Myoblasts.

Abstract

[Purpose] Many studies have been using cell culture models of muscle cells with exogenous cytokines or glucocorticoids to mimic atrophy in in vivo and in vitro tests. However, the changes in the phosphorylation of atrophy-related cofilin are still poorly understood in starved skeletal muscle cells. In this study, we first examined whether or not phosphorylation of cofilin is altered in L6 myoblasts after 3, 6, 12, 24, 48, and 72 hours of serum-free starvation with low glucose. [Methods] We used Western blotting to exam protein expression and phosphorylation in atrophied L6 myoblasts. [Results] L6 cell sizes and numbers were diminished as a result of serum-free starvation in a time-dependent manner. Serum-free starvation for 3, 6, 12, 24, 48, and 72 hours significantly decreased the phosphorylation of cofilin, respectively. [Conclusion] These results suggest that starvation-induced atrophy may be in part related to changes in the phosphorylation of cofilin in L6 myoblasts.

• Authors: Mee-Young Kim, Ju-Hyun Kim, Jeong-Uk Lee, Lim-Kyu Lee, Seung-Min Yang, Byoung-Sun Park, Hye-Joo Jeon, Won-Deok Lee, Ji-Woong Noh, Taek-Yong Kwak, Sung-Ho Jang, Tae-Hyun Lee, Ju-Young Kim, Tae-Whan Kim, Bokyung Kim, Junghwan Kim
• Journal: Journal of physical therapy science (J Phys Ther Sci) Vol. 26 Issue 10 Pg. 1543-5 (Oct 2014) ISSN: 0915-5287 [Print] Japan
• PMID: 25364107 (Publication Type: Journal Article)