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Nanoscale Silk-Hydroxyapatite Hydrogels for Injectable Bone Biomaterials.

Zhaozhao Ding1,2, Hongyan Han1, Zhihai Fan3

  • 1School of Biology and Basic Medical Sciences and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University , Suzhou 215123, People's Republic of China.

ACS Applied Materials & Interfaces
|May 5, 2017
PubMed
Summary

Injectable silk-hydroxyapatite hydrogels promote bone regeneration by mimicking the bone niche and providing physical cues for osteogenesis. These composite materials effectively heal irregular bone defects, showing significant potential as bone substitutes.

Keywords:
biomimeticbone regenerationhydroxyapatiteinjectabilitysilk

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Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Tissue Engineering

Background:

  • Injectable hydrogels serve as crucial bone substitutes for regenerating irregular defects due to their favorable handling properties.
  • Silk-based materials and hydroxyapatite (HA) are promising components for bone regeneration applications.

Purpose of the Study:

  • To develop injectable silk-hydroxyapatite (silk-HA) composite hydrogels as advanced biomaterials for osteogenesis.
  • To mimic the native bone niche with a high content of HA and specific mechanical properties to induce bone formation.

Main Methods:

  • Preparation of thixotropic silk nanofiber hydrogels blended with water-dispersible silk-HA nanoparticles.
  • Characterization of the injectable nanoscale systems for homogeneous HA distribution (60% w/w) and mechanical modulus (∼21 kPa).
  • Evaluation of osteogenesis and bone defect healing in vivo after implantation of the silk-HA composite hydrogels.

Main Results:

  • The silk-HA composite hydrogels achieved a homogeneous distribution of high HA content and a modulus of ∼21 kPa.
  • The composite hydrogels demonstrated significantly improved osteogenesis compared to silk nanofiber hydrogels alone.
  • Successful regeneration of newly formed bone tissue and healing of bone defects were observed post-implantation.

Conclusions:

  • Injectable silk-HA composite hydrogels effectively support osteogenesis and bone defect regeneration.
  • The developed biomaterial shows significant potential for the treatment of irregular bone defects.
  • The combination of silk nanofibers and high HA content creates a bone niche that promotes bone healing.