Development of a human skeletal micro muscle platform with pacing capabilities

Area of Science:

• Biotechnology
• Tissue Engineering
• Human Physiology

Background:

• Three-dimensional engineered culture systems advance human biology research and disease target identification.
• Bioengineered skeletal muscle models mimic native muscle biology.
• Current methods are limited by high cell, reagent, and labor demands, hindering high-throughput applications.

Purpose of the Study:

• To develop a miniaturized platform for semi-automated formation, culture, and analysis of human skeletal micro muscles (hμMs).
• To establish a serum-free differentiation protocol for rapid, directed differentiation of myoblasts into functional myofibers.
• To enable high-throughput studies in human skeletal muscle biology and exercise physiology.

Main Methods:

• Utilized a miniaturized 96-well micro-muscle platform for semi-automated tissue engineering.
• Employed an iterative screening approach to define a serum-free differentiation protocol.
• Developed an optogenetic stimulation method to mimic exercise training effects.

Main Results:

• Successfully formed organized bundles of striated and functional human skeletal micro muscles (hμMs).
• Demonstrated appropriate response of hμMs to electrical stimulation.
• Replicated exercise training features, including myofiber hypertrophy and increased metabolic protein expression, using optogenetic stimulation.

Conclusions:

• The miniaturized micro-muscle platform facilitates semi-automated, high-throughput studies of human skeletal muscle.
• The developed serum-free protocol enhances directed differentiation of myoblasts.
• This platform offers a novel tool for investigating human skeletal muscle biology and exercise physiology.