Effects of electrical stimulation in C2C12 muscle constructs

Area of Science:

• Biomedical Engineering
• Cell Biology
• Tissue Engineering

Background:

• Electrical stimulation (ES) influences extracellular matrix (ECM) deposition and cellular differentiation.
• Type I collagen is a major ECM protein, but its response to ES in C2C12 cells is not well understood.

Purpose of the Study:

• To investigate the effects of ES parameters (voltage and frequency) on C2C12 muscle cells cultured in 3D collagen scaffolds.
• To assess metabolic activity, type I collagen deposition, cell morphology, and sarcomere organization under ES.

Main Methods:

• C2C12 cells were cultured in collagen scaffolds and subjected to ES (2, 5, 7 V; 1, 2 Hz) using carbon electrodes.
• Metabolic activity was measured via glucose:lactate ratio.
• Collagen deposition, apoptosis, and ultrastructure were assessed using immunohistology, TUNEL staining, and Transmission Electron Microscopy (TEM).

Main Results:

• All ES groups maintained similar metabolic activity and showed no significant apoptotic damage.
• 2 Hz stimulation led to reduced type I collagen deposition compared to control and 1 Hz groups.
• 1 Hz/5 V stimulation enhanced desmin expression, and 1 Hz/5 V and 2 Hz/5 V groups showed improved contractile properties with organized sarcomeres.

Conclusions:

• Electrical stimulation parameters, specifically frequency, can modulate type I collagen accumulation in C2C12 cells.
• Specific voltage and frequency combinations influence muscle sarcomere differentiation and contractile properties in excitable cells.