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Constructing a Collagen Hydrogel for the Delivery of Stem Cell-loaded Chitosan Microspheres
Published on: June 1, 2012
Adipose-derived stem cell delivery into collagen gels using chitosan microspheres
Shanmugasundaram Natesan1, David G Baer, Thomas J Walters
1United States Army Institute of Surgical Research , Fort Sam Houston, TX, USA.
Tissue Engineering. Part A
|November 18, 2009
Summary
This study developed a method using chitosan microspheres to deliver adipose-derived stem cells into collagen scaffolds. The microspheres successfully supported cell growth, viability, and multipotency for tissue repair applications.
Area of Science:
- Biomaterials Science
- Stem Cell Biology
- Tissue Engineering
Background:
- Effective stem cell delivery is crucial for tissue regeneration.
- Chitosan microspheres offer potential as a cell carrier system.
- Collagen scaffolds are widely used in tissue engineering.
Purpose of the Study:
- To develop an in vitro strategy for loading and releasing adipose-derived mesenchymal stem cells (ASC) from chitosan microspheres (CSM) into a collagen gel scaffold.
- To evaluate the viability, function, and multipotency of ASC after encapsulation and release.
- To demonstrate the potential of this system for in vitro cell expansion and subsequent delivery for tissue repair.
Main Methods:
- Porous chitosan microspheres (CSM) were fabricated.
- Adipose-derived mesenchymal stem cells (ASC) were loaded onto and infiltrated into CSM.
- Cell viability and proliferation were assessed using MTT and Calcein AM assays.
- Cell attachment, infiltration, and morphology were examined using electron microscopy.
- ASC-loaded CSM were embedded in type-1 collagen gel for in vitro cell release and scaffold population.
- Cell differentiation potential was evaluated.
Main Results:
- Uniform, porous CSM were successfully prepared as stem cell carriers.
- ASC attached to and infiltrated CSM, maintaining viability and metabolic activity.
- Cells proliferated within microspheres, reaching maximum numbers by 24 hours.
- ASC retained stem cell markers and multipotency (adipogenic and osteogenic differentiation).
- ASC released from CSM populated the collagen gel scaffold within 14 days.
- Released cells exhibited fibroblast-like morphology and aligned with collagen fibrils.
Conclusions:
- Chitosan microspheres provide a suitable platform for capturing, expanding, and delivering adipose-derived mesenchymal stem cells.
- This in vitro model demonstrates successful cell loading, controlled release, and scaffold colonization for potential tissue repair.
- The developed system supports stem cell viability, multipotency, and integration within a collagen matrix.
