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Researchers created a novel 3D fibrous scaffold using wet-spinning to mimic the tendon-to-bone interface. This scaffold guides cell alignment and promotes natural bone matrix formation for tissue engineering applications.

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Regenerative Medicine

Background:

  • Tendon-to-bone interfaces are complex hierarchical structures requiring biomimetic scaffolds for regeneration.
  • Existing methods struggle to replicate the gradual transition between mineralized and non-mineralized tissues.

Purpose of the Study:

  • To fabricate a novel 3D fibrous scaffold with controlled mineral distribution and cellular alignment.
  • To replicate the hierarchical multitissue transition of the tendon-to-bone interface.
  • To assess the biological performance of the scaffold using human adipose-derived stem cells (hASCs).

Main Methods:

  • Fabrication of continuous microfibers using polycaprolactone (PCL)/gelatin and PCL/gelatin/hydroxyapatite (HAp) via wet-spinning.
  • Spatial control over mineral distribution and cellular alignment achieved through extrusion rates and material composition.
  • Assembly of microfibers into a 3D gradient structure to mimic the native interface.

Main Results:

  • PCL/gelatin microfibers exhibited aligned topography, inducing cytoskeleton elongation in hASCs, mimicking tenogenic organization.
  • PCL/gelatin/HAp microfibers demonstrated matrix mineralization, suggesting osteogenic potential without external supplementation.
  • A 3D gradient scaffold was successfully created with continuous topographical and compositional gradients.

Conclusions:

  • Wet-spinning is a feasible technique for generating aligned and textured microfibers for complex 3D structures.
  • The developed scaffold effectively mimics key features of tendon-to-bone interfaces.
  • This approach holds promise for advancing regenerative medicine strategies for musculoskeletal injuries.