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Related Experiment Video

Updated: Oct 2, 2025

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Aligned Gelatin Microribbon Scaffolds with Hydroxyapatite Gradient for Engineering the Bone-Tendon Interface.

Alice E Stanton1, Xinming Tong2, Serena L Jing1

  • 1Department of Bioengineering and Stanford University, Stanford, California, USA.

Tissue Engineering. Part A
|March 1, 2022
PubMed
Summary

This study introduces a novel scaffold using aligned gelatin microribbons and a hydroxyapatite gradient to guide human mesenchymal stem cells for bone-tendon interface repair. This single-cell-source approach enhances tissue regeneration and mechanical properties.

Keywords:
bone–tendongradienthydroxyapatiteinterfacemesenchymal stem cellsmicroribbon

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Regenerative Medicine

Background:

  • Musculoskeletal injuries like rotator cuff tears require effective bone-tendon interface repair methods.
  • Current tissue engineering strategies often need multiple cell types and complex scaffolds.
  • Mimicking the native aligned tissue morphology in 3D bone-tendon interfaces is challenging.

Purpose of the Study:

  • To develop a single-cell-source, continuous scaffold for engineering the bone-tendon interface.
  • To create a scaffold that guides zonal-specific differentiation of human mesenchymal stem cells (hMSCs).
  • To mimic the native bone-tendon transition using aligned hydrogel structures and material gradients.

Main Methods:

  • Fabrication of aligned gelatin microribbon (μRB) hydrogel scaffolds with a hydroxyapatite nanoparticle (HA-np) gradient.
  • Utilizing hMSCs as a single cell source for differentiation within the scaffold.
  • Employing chondrogenic priming followed by osteogenic factors to guide zonal differentiation.
  • Assessing cell alignment, zonal differentiation, and mechanical properties (tensile moduli).

Main Results:

  • Aligned μRBs successfully induced 3D cell alignment.
  • The HA gradient guided zonal-specific differentiation of hMSCs, mimicking the bone-tendon interface.
  • Chondrogenic priming enhanced the bone-cartilage-tendon transition mimicry.
  • Resulting tissues showed significantly improved tensile moduli (over 45-fold enhancement).

Conclusions:

  • Aligned gelatin μRBs with HA gradient offer a promising strategy for bone-tendon interface engineering using a single cell source.
  • This approach simplifies scaffold design and potentially enhances zone integration and scaffold integrity.
  • The developed platform shows potential for clinical translation in treating bone-tendon injuries.