Smooth muscle architecture within cell-dense vascular tissues influences functional contractility

Area of Science:

• Biomedical Engineering
• Vascular Biology
• Cellular Mechanics

Background:

• The relationship between vascular smooth muscle (VSM) architecture and vessel function is not well understood.
• Understanding this link is crucial for both healthy and diseased vasculature.

Purpose of the Study:

• To investigate the connection between VSM architecture and contractile output.
• To utilize engineered vascular tissues to explore this relationship.

Main Methods:

• Employing microcontact printing and microfluidic cell seeding to create engineered vascular tissues.
• Establishing three distinct initial seeding conditions to influence cellular architecture.
• Assessing basal and stimulated contractile stress, alongside contractile phenotype marker expression.

Main Results:

• Engineered tissues exhibited confluent and aligned cellular structures, with variations in cellular architecture across conditions.
• Tissues with more elongated cellular architecture demonstrated significantly higher basal stress.
• These tissues also produced greater contractile stress upon endothelin-1 stimulation.
• A correlation was observed between contractile phenotype marker expression and cellular architecture in dense tissues.

Conclusions:

• Cellular and tissue architecture play a critical role in modulating smooth muscle contractility within dense vascular tissues.
• Findings suggest that VSM architecture is a key determinant of contractile function, influencing both basal and stimulated states.