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Biphasic Hydrogels Integrating Mineralized and Anisotropic Features for Interfacial Tissue Engineering
Mari Carmen Echave1,2, Rui M A Domingues3,4,5, Manuel Gómez-Florit3,4
1NanoBioCel Group, Laboratory of Pharmaceutics, School of Pharmacy , University of the Basque Country UPV/EHU , Paseo de la Universidad 7 , Vitoria-Gasteiz 01006 , Spain.
ACS Applied Materials & Interfaces
|December 3, 2019
Summary
This study engineered a multiphasic hydrogel to mimic complex tissue interfaces, successfully guiding stem cell differentiation towards bone and tendon tissues for regenerative medicine applications.
Area of Science:
- Biomaterials Science
- Regenerative Medicine
- Tissue Engineering
Background:
- Musculoskeletal tissue interfaces are vital for function but degenerate in disease.
- Restoring these complex junctions is a key challenge in regenerative medicine.
Purpose of the Study:
- To develop a multiphasic hydrogel system mimicking the graded complexity of tendon-to-bone interfaces.
- To evaluate the system's potential for guiding stem cell differentiation.
Main Methods:
- A gelatin-based multiphasic hydrogel was created with distinct phases incorporating hydroxyapatite (bone mimic) or cellulose nanocrystals (CNC, tendon mimic).
- Enzymatic cross-linking and magnetic alignment of CNC were used to control microstructure and anisotropy.
- Human adipose-derived stem cells were cultured on the hydrogel to assess biological response.
Main Results:
- Mineralized phases increased hydrogel stiffness, while aligned CNC created anisotropic structures.
- Stem cells showed aligned growth and increased tenascin in anisotropic phases.
- Stem cells in mineralized phases exhibited increased alkaline phosphatase activity and osteopontin expression.
Conclusions:
- The gelatin-transglutaminase system offers a versatile platform for creating biomimetic composite materials.
- This approach shows promise for engineering complex connective tissue interfaces for regenerative medicine.
