Topotactic fibrillogenesis of freeze-casted microridged collagen scaffolds for 3D cell culture

TL;DR

This study introduces a novel ice-templating method to create ordered, macroporous collagen scaffolds that support 3D cell growth and alignment, advancing tissue engineering applications.

Contribution

It presents a new topotactic fibrillogenesis approach for fabricating collagen scaffolds with controlled architecture and mechanical properties under non-denaturing conditions.

Findings

Collagen scaffolds support cell migration and alignment.

The method produces mechanically robust, non-cross-linked collagen structures.

Aligned cell populations demonstrate potential for tissue engineering applications.

Abstract

Type I collagen is the main component of the extra-cellular matrix (ECM). In vitro, under a narrow window of physico-chemical conditions, type I collagen self-assembles to form complex supramolecular architectures reminiscent of those found in native ECM. Presently, a major challenge in collagen-based biomaterials is to couple the delicate collagen fibrillogenesis events with a controlled shaping process in non-denaturating conditions. In this work an ice-templating approach promoting the structuration of collagen into macroporous monoliths is used. Instead of common solvent removal procedures, a new topotactic conversion approach yielding self-assembled ordered fibrous materials is implemented. These collagen-only, non-cross-linked scaffolds exhibit uncommon mechanical properties in the wet state. With the help of the ice-patterned micro-ridge features, Normal Human Dermal Fibroblasts and C2C12 murine myoblasts successfully migrate and form highly-aligned populations within the resulting 3D biomimetic collagen scaffolds. These results open a new pathway to the development of new tissue engineering scaffolds ordered across various organization levels from the molecule to the macropore, and are of particular interest for biomedical applications where large scale 3D cell alignment is needed such as for muscular or nerve reconstruction.