Nanofiber-hydrogel composite-mediated angiogenesis for soft tissue reconstruction

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Tissue Engineering

Background:

• Millions suffer from soft tissue loss due to various causes.
• Current treatments like autologous flaps, implants, and fillers have significant limitations, including donor site defects, fibrosis, and transient results.
• Existing tissue engineering approaches struggle with vascularization for large-volume defects.

Purpose of the Study:

• To develop an injectable off-the-shelf material for soft tissue restoration.
• To create a composite that promotes angiogenesis and tissue regeneration.
• To overcome the limitations of current soft tissue augmentation methods.

Main Methods:

• Fabrication of a nanofiber-hydrogel composite using electrospun poly(ε-caprolactone) fibers and a hyaluronic acid hydrogel network.
• Subcutaneous injection of the composite in a rat model.
• Assessment of host cell infiltration, macrophage polarization, and tissue remodeling.
• Evaluation of the composite in a rabbit model for soft tissue defect repair.

Main Results:

• The composite mimics the extracellular matrix's microarchitecture and mechanical properties.
• Injected composite infiltrated host macrophages, polarizing them towards a pro-regenerative phenotype.
• Macrophages secreted pro-angiogenic factors, leading to gradual replacement of the composite with vascularized soft tissue.
• Successful host cell infiltration and angiogenesis were observed in both rat and rabbit models.

Conclusions:

• The injectable nanofiber-hydrogel composite effectively restores soft tissue volume.
• This biomaterial augments the body's natural regenerative capacity.
• It offers a durable solution for soft tissue defects by promoting vascularization and host tissue integration.