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Engineering smooth muscle tissue with a predefined structure

B S Kim1, D J Mooney

  • 1Department of Chemical Engineering, University of Michigan, Ann Arbor 48109-2136, USA.

Journal of Biomedical Materials Research
|June 25, 1998
PubMed
Summary
This summary is machine-generated.

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Engineered tissues using polyglycolic acid (PGA) fibers can now maintain their structure. Bonding PGA fibers with poly-L-lactic acid (PLLA) enhances matrix stability and enables controlled tissue development in vitro.

Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Polymer Chemistry

Background:

  • Nonwoven polyglycolic acid (PGA) fiber meshes serve as synthetic extracellular matrices (ECMs) in tissue engineering.
  • Current PGA-based ECMs lack structural stability, hindering the development of engineered tissues with precise configurations and dimensions.

Purpose of the Study:

  • To investigate the structural integrity of PGA fiber matrices bonded with poly-L-lactic acid (PLLA) against cellular contractile forces.
  • To assess the ability of these enhanced matrices to maintain predefined structures during in vitro smooth muscle (SM) tissue development.

Main Methods:

  • PGA fiber matrices were bonded at fiber crosspoints using poly-L-lactic acid (PLLA).
  • Compressive modulus, degradation rates, and cellular adherence were evaluated.

Related Experiment Videos

  • Matrix volume and shape were monitored over 7 weeks of in vitro smooth muscle cell culture.

    • Main Results:

    • PLLA-bonded PGA matrices showed a 10- to 35-fold increase in compressive modulus compared to unbonded matrices.
    • Bonded matrices exhibited significantly slower degradation rates.
    • After 7 weeks, bonded matrices retained 101% of their initial volume and shape, while unbonded matrices contracted to 5% of their volume.
    • Bonded matrices supported high cellularity and smooth muscle cell-derived extracellular matrix production.

    Conclusions:

    • Physically bonding PGA fibers with PLLA significantly enhances matrix structural stability and resistance to cellular forces.
    • This approach enables the maintenance of predefined matrix dimensions and configurations for engineered tissue development.
    • Matching initial mechanical properties and degradation rates to specific tissue engineering needs is crucial for successful outcomes.