Cyclic mechanical strain regulates the development of engineered smooth muscle tissue

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Regenerative Medicine

Background:

• Engineered tissues often exhibit inferior mechanical properties compared to native tissues.
• Developing methods to enhance mechanical strength is crucial for clinical applications of tissue engineering.

Purpose of the Study:

• To investigate the impact of mechanical stimuli on the mechanical properties of engineered smooth muscle tissues.
• To determine the role of polymeric scaffolds in mediating the effects of mechanical stimulation.

Main Methods:

• Smooth muscle cells were cultured on two distinct polymeric scaffolds.
• Engineered tissues were subjected to cyclic mechanical strain over short and long term periods.
• Cell proliferation, gene expression (collagen, elastin), tissue organization, and mechanical properties were assessed.

Main Results:

• Short-term strain increased smooth muscle cell proliferation and extracellular matrix component expression on specific scaffolds.
• Long-term strain application led to upregulated collagen and elastin gene expression and enhanced tissue organization.
• A significant, greater than tenfold, increase in mechanical properties was observed after long-term cyclic strain application.

Conclusions:

• Combinations of mechanical stimuli and appropriate polymeric scaffolds can substantially enhance the mechanical properties of engineered tissues.
• Mechanical stimulation is a viable strategy to improve the functional outcomes of tissue-engineered constructs.
• This study provides a foundation for designing improved protocols in smooth muscle tissue engineering.