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A fibrin-based arterial media equivalent.

E D Grassl¹, T R Oegema, R T Tranquillo

¹Department of Chemical Engineering & Materials Science, 312 Church Street SE, University of Minnesota, Minneapolis, Minnesota 55455, USA.

Journal of Biomedical Materials Research. Part A

|August 15, 2003

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Optimizing culture conditions for smooth muscle cells in fibrin gels enhanced collagen production and mechanical strength. Supplementation with TGF-beta and insulin, along with extended culture time, significantly improved tissue-engineered media equivalents.

Area of Science:

Biomaterials Science
Tissue Engineering
Regenerative Medicine

Background:

Fibrin-based materials are promising for tissue engineering due to their biocompatibility.
Optimizing culture conditions is crucial for enhancing the mechanical properties and cellular functions of engineered tissues.
Smooth muscle cells (SMCs) play a vital role in vascular tissue function.

Purpose of the Study:

To optimize culture conditions for neonatal SMCs within tubular fibrin gels to improve collagen production and mechanical properties of a fibrin-based media equivalent (ME).
To investigate the effects of fibrinolysis inhibitor concentration, cell source, cell density, growth factors (TGF-beta, insulin), and culture duration.

Main Methods:

Culturing neonatal and adult SMCs in tubular fibrin gels with varying concentrations of epsilon-aminocaproic acid (ACA).

Related Experiment Videos

Assessing collagen production and mechanical properties (ultimate tensile strength and modulus) under different conditions.

Supplementing culture medium with TGF-beta and insulin, and evaluating outcomes at 3 and 6 weeks.

Main Results:

ACA concentration affected gel integrity but not collagen production.
Neonatal SMCs and longer culture times (6 weeks) with TGF-beta and insulin yielded superior results.
TGF-beta and insulin significantly increased collagen content (6-fold) and mechanical strength (20-fold) after 3 weeks.
Fibrin MEs cultured for 6 weeks exhibited mechanical properties comparable to native rat aorta.

Conclusions:

Optimized culture conditions, including TGF-beta, insulin, and extended culture time, significantly enhance the quality of fibrin-based MEs.
Fibrin-based MEs demonstrate potential as strong and stiff vascular graft materials.
Further research into fibrin-based scaffolds holds promise for vascular tissue engineering.