Hydrogels derived from demineralized and decellularized bone extracellular matrix.

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Regenerative Medicine

Background:

• Extracellular matrix (ECM) scaffolds from decellularized mammalian tissues aid tissue repair.
• Site-specific homologous ECMs show superior function over heterologous ones.
• Demineralized bone matrix (DBM) is used for bone defect treatment, often with carrier liquids that can cause adverse effects.

Purpose of the Study:

• To decellularize bovine bone to create demineralized bone matrix (DBM) and extracellular matrix (ECM) materials.
• To characterize the structure and composition of DBM and ECM.
• To develop soluble DBM and ECM that can form hydrogels for potential clinical delivery without carrier liquids.

Main Methods:

• Stringent decellularization process applied to bovine bone.
• Characterization of DBM and ECM structure and composition.
• Solubilization of DBM and ECM to induce hydrogel formation.
• Assessment of hydrogel gelation kinetics, mechanical properties (storage moduli), and cell proliferation (mouse primary calvarial cells).

Main Results:

• DBM and ECM hydrogels demonstrated sigmoidal gelation kinetics, indicating a nucleation and growth mechanism.
• ECM hydrogels exhibited lower storage moduli compared to DBM hydrogels.
• ECM hydrogels promoted enhanced proliferation of mouse primary calvarial cells compared to collagen type I and DBM hydrogels.

Conclusions:

• DBM and ECM hydrogels possess distinct structural, mechanical, and biological properties.
• These hydrogels have the potential for clinical applications in bone defect treatment, potentially eliminating the need for carrier liquids.
• Further research into these hydrogel forms could advance regenerative medicine strategies.