Interpenetrating Polymer Network Hydrogel Composition Alters Encapsulated MSC Spreading and In Vivo Degradation...

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Cell Biology

Background:

• Multipotent mesenchymal stromal cells (MSCs) are crucial for regenerative medicine.
• Current 3D cell culture methods often struggle to independently control material properties and cell behavior.
• Mimicking the extracellular matrix (ECM) is key for effective cell culture and tissue regeneration.

Purpose of the Study:

• To develop an interpenetrating polymer network (IPN) hydrogel for 3D MSC culture.
• To independently control cell spreading and material modulus.
• To enhance MSC adhesion, spreading, and proliferation within a biomaterial scaffold.

Main Methods:

• Formulation of a semisynthetic IPN hydrogel combining poly(ethylene glycol)-fibrinogen (PF) and guest-host (GH) networks.
• Incorporation of hyaluronic acid (HA) with β-cyclodextrin (CD) and adamantane (Ad) for dynamic properties.
• Tuning material modulus via poly(ethylene glycol)-diacrylate (PEG-DA) cross-linking.
• Assessment of cell spreading kinetics and proliferation in 3D culture.
• In vivo biodegradation studies using MRI analysis after subcutaneous implantation.

Main Results:

• The IPN hydrogel facilitated faster MSC spreading kinetics, independent of material modulus.
• MSCs exhibited enhanced spreading and growth in the dynamic IPN compared to single-network hydrogels.
• Increased PEG-DA cross-linking accelerated IPN biodegradation in vivo, unlike in single-network hydrogels.
• The IPN design effectively mimics the ECM, supporting cell adhesion, spreading, and proliferation.

Conclusions:

• The developed IPN hydrogel offers independent control over cell spreading and modulus.
• Dynamic GH interactions within the IPN provide localized adaptability for cell-mediated remodeling.
• This biomaterial design shows promise for MSC-based tissue engineering and regenerative medicine applications.