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Hierarchically structured seamless silk scaffolds for osteochondral interface tissue engineering.

Yogendra Pratap Singh1, Joseph Christakiran Moses, Bibhas K Bhunia

  • 1Biomaterial and Tissue Engineering Laboratory, Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati - 781039, Assam, India. biman.mandal@iitg.ac.in mandal.biman@gmail.com.

Journal of Materials Chemistry. B
|April 8, 2020
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Summary

This study developed a silk fibroin biphasic scaffold for osteochondral regeneration. The scaffold effectively promoted cartilage and bone tissue regrowth in rabbits, showing promising results for future clinical applications.

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Regenerative Medicine

Background:

  • The osteochondral healthcare market requires advanced, affordable, and biomimetic scaffolds.
  • Silk fibroin (SF) offers a versatile single-polymer solution for fabricating complex tissue engineering constructs.

Purpose of the Study:

  • To develop and evaluate a novel biphasic scaffold using silk fibroin for simultaneous cartilage and bone regeneration.
  • To assess the in vitro and in vivo efficacy of the biphasic scaffold in promoting osteochondral defect repair.

Main Methods:

  • Fabrication of a continuous, integrated biphasic scaffold with distinct fiber-free and fiber-reinforced phases from silk fibroin.
  • Comprehensive physicochemical and mechanical characterization of the scaffold.
  • In vitro assessment of chondrocyte and osteoblast response, including proliferation, differentiation, and immune response.
  • In vivo evaluation of the scaffold in rabbit osteochondral defects, followed by histological and micro-CT analysis.

Main Results:

  • The biphasic scaffold exhibited interconnected pores, tunable degradation, and suitable mechanical properties (40 kPa compressive modulus).
  • In vitro studies confirmed scaffold support for chondrocyte and osteoblast growth, with significant upregulation of ALP activity and ECM secretion.
  • In vivo implantation demonstrated superior cartilage and subchondral bone regeneration compared to monophasic scaffolds, with regenerated bone mineral density of 600-700 mg HA/cm³.

Conclusions:

  • The hierarchically structured biphasic silk fibroin scaffold effectively promotes in vitro extracellular matrix deposition and in vivo osteochondral tissue regeneration.
  • This biomimetic scaffold presents a promising therapeutic strategy for treating osteochondral defects.