Enhanced Osteogenesis of Mesenchymal Stem Cells Encapsulated in Injectable Microporous Hydrogel

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Tissue Engineering

Background:

• Delivering therapeutic stem cells for bone repair faces challenges in vehicle design to promote cell behavior.
• Optimizing cell delivery vehicles is crucial for successful clinical translation of bone tissue regeneration therapies.

Approach:

• Developed an injectable microporous hydrogel from crosslinked gelatin microgels for encapsulating human mesenchymal stem cells (MSCs).
• Compared MSC behavior and osteogenic differentiation in microporous hydrogels versus traditional nonporous hydrogels.
• Utilized alkaline phosphatase (ALP) and calcium assays, alongside RNA-sequencing, to evaluate cellular responses and gene expression.

Key Points:

• MSCs in microporous hydrogels exhibited rapid spreading and cell-cell connections, unlike those isolated in nonporous hydrogels.
• Microporous hydrogels significantly enhanced MSC osteogenic differentiation and calcium deposition compared to nonporous hydrogels.
• RNA-seq analysis confirmed upregulation of genes and pathways related to cell spreading, cell-cell connections, and osteogenesis in the microporous hydrogel.

Conclusions:

• Injectable microporous hydrogels facilitate superior stem cell behavior and osteogenic differentiation for bone regeneration.
• Microgel-based hydrogels represent a promising tool for therapeutic cell delivery in bone tissue repair applications.
• This study highlights the importance of hydrogel architecture in dictating stem cell fate and therapeutic efficacy.