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Core-Shell Pure Collagen Threads Extruded from Highly Concentrated Solutions Promote Colonization and Differentiation
Lise Picaut1,2, Léa Trichet2, Christophe Hélary2
1Institut des Nanosciences de Paris, Sorbonne-Université, UPMC Univ Paris 6 and CNRS-UMR 7588, F-75005 Paris, France.
ACS Biomaterials Science & Engineering
|January 5, 2021
Summary
Engineered collagen threads promote stem cell differentiation for tendon regeneration. These scaffolds offer tunable properties, guiding mesenchymal stem cells towards tenocyte development for improved tissue engineering applications.
Area of Science:
- Biomaterials Engineering
- Tissue Engineering
- Cell Biology
Background:
- Developing effective scaffolds for targeted cell differentiation is crucial for tissue regeneration.
- Type I collagen is a promising biomaterial due to its biocompatibility and native presence in connective tissues.
Purpose of the Study:
- To engineer dense type I collagen threads with specific morphological and mechanical properties.
- To investigate the influence of these collagen scaffolds on C3H10T1/2 mesenchymal stem cell differentiation.
- To evaluate the potential of these scaffolds for tendon regeneration.
Main Methods:
- Fabrication of collagen threads via extrusion of collagen solutions at varying concentrations (15, 30, 60 mg/mL).
- Characterization of thread morphology, including core-shell structure and fibril orientation.
- Mechanical testing to determine Young's modulus and ultimate tensile stress.
- In vitro culture of C3H10T1/2 cells on collagen scaffolds and assessment of cell orientation, penetration, and differentiation marker expression (Tnmd).
Main Results:
- Dense, fibrillated collagen threads with a core-shell structure and longitudinal fibril orientation were successfully produced.
- Collagen threads exhibited significant mechanical properties (Young's modulus up to 1 MPa) without cross-linking.
- C3H10T1/2 cells aligned with the thread axis and showed varying penetration based on scaffold concentration.
- Cells cultured on 30 mg/mL collagen threads demonstrated strong expression of the tendon differentiation marker Tnmd.
Conclusions:
- The morphological and mechanical properties of engineered collagen threads are critical for promoting mesenchymal stem cell differentiation into tenocytes.
- Collagen threads offer a tunable platform for developing advanced tissue engineering scaffolds.
- These findings present a promising strategy for optimizing scaffolds for tendon regeneration.
