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A new construction technique for tissue-engineered heart valves using the self-assembly method.

Catherine Tremblay¹, Jean Ruel, Jean-Michel Bourget

¹1 Département de génie mécanique, Faculté des sciences et de génie, Université Laval , Québec, Canada .

Tissue Engineering. Part C, Methods

|March 1, 2014

Summary

This summary is machine-generated.

Tissue engineering offers a promising solution for heart valve replacement. A novel self-assembly method successfully created a fully biological aortic valve with functional leaflet movement in a bioreactor.

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Area of Science:

Biomaterials Science
Regenerative Medicine
Cardiovascular Engineering

Background:

Current heart valve replacements (mechanical and tissue) have significant limitations.
Tissue engineering aims to develop superior heart valve substitutes.
The self-assembly method offers potential for creating complex biological structures.

Purpose of the Study:

To present the construction of a novel, entirely biological, stentless aortic valve using self-assembly.
To assess the initial performance of this engineered valve in a bioreactor under pulsatile flow.

Main Methods:

Fibroblast sheets were stacked to create a thick tissue using self-assembly.
Custom templates guided the tissue into a native aortic valve 3D shape.
A two-step process involved flat preshaping, maturation, and cylindrical 3D forming.
Histological analysis (Masson's Trichrome, Picrosirius Red) evaluated tissue microstructure.
The valve prototype was tested in a bioreactor with a 0.5 Hz pulsatile flow.

Main Results:

The self-assembly technique produced a uniformly cellular thick tissue with dense extracellular matrix and corrugated collagen fibers.
The engineered aortic valve demonstrated leaflet opening and closing in response to pulsatile flow in the bioreactor.
Microscopic analysis confirmed tissue integrity throughout the construction process.

Conclusions:

The self-assembly method is a viable technique for constructing complex 3D biological structures like heart valves.
This study presents a promising first step towards fully biological, engineered heart valve substitutes.
The engineered valve exhibited basic functional capacity under simulated physiological conditions.