Microarray profiling of gene expression in C2C12 myotubes trained by electric pulse stimulation

Area of Science:

• Muscle physiology
• Biotechnology
• Molecular biology

Background:

• Electric pulse stimulation (EPS) improves sarcomere structure and tension in C2C12 myotubes.
• EPS termination rapidly decreases active tension and disassembles sarcomeres, mimicking in vitro muscle atrophy.

Purpose of the Study:

• To investigate the molecular mechanisms behind the rapid loss of muscle function after EPS termination.
• To identify gene expression changes associated with EPS cessation in C2C12 myotubes.

Main Methods:

• Transcriptomic analysis using microarray.
• C2C12 myotubes were subjected to EPS, followed by termination and re-application of EPS.
• Gene expression profiling was performed at different time points.

Main Results:

• After 30 minutes of EPS termination, 74 genes were upregulated and 120 downregulated, with no atrophy-related genes identified.
• Re-applying EPS after 8 hours of termination reversed expression changes in a small number of genes (4 upregulated, 2 downregulated by termination).
• None of the identified genes were directly related to atrophy or hypertrophy.

Conclusions:

• EPS cessation induces rapid molecular changes in myotubes, distinct from typical atrophy gene expression.
• The study provides insights into the rapid functional decline and structural changes observed after stopping electrical stimulation.
• Further research is needed to fully understand the specific genes involved in EPS-induced muscle response and deconditioning.