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Injectable Thermosensitive Thiol-Modified NIPAAm-g-Chitosan Hydrogels for Cartilage Regeneration in a Rabbit

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  • 1Department of Biomedical Engineering, National Cheng Kung University, Tainan 70101, Taiwan.

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Summary

This study shows that thiol-modified NIPAAm-g-chitosan (TNC) hydrogels with human adipose-derived mesenchymal stem cells (hADMSCs) improve cartilage repair in osteoarthritis models. Adding etanercept further enhanced osteochondral defect repair.

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Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Orthopedics

Background:

  • Cartilage has limited self-healing capacity, necessitating advanced repair strategies.
  • Osteoarthritis (OA) is often linked to traumatic articular cartilage defects.
  • Existing cartilage regeneration studies often overlook OA models.

Purpose of the Study:

  • To evaluate TNC hydrogels with hADMSCs for cartilage regeneration in an OA rabbit model.
  • To investigate the role of etanercept in enhancing osteochondral defect repair within the OA context.
  • To assess the efficacy of TNC hydrogels as a potential scaffold for cartilage tissue engineering.

Main Methods:

  • Synthesis and characterization of TNC hydrogels (DSC, SEM, NMR, CCK8).
  • Establishment of a monosodium iodoacetate (MIA)-induced OA rabbit model.
  • Evaluation of cartilage repair using macroscopic, micro-CT, histological, and immunohistochemical analyses.

Main Results:

  • TNC hydrogels exhibited suitable properties (LCST, porosity, mechanical strength) and were non-cytotoxic.
  • Cell-seeded hydrogel groups demonstrated improved cartilage regeneration compared to empty defects in OA models.
  • Etanercept significantly promoted osteochondral defect repair within the initial 4 weeks.

Conclusions:

  • TNC hydrogels loaded with hADMSCs show promise for cartilage tissue engineering in OA.
  • The combination of TNC hydrogels, hADMSCs, and etanercept offers a potential therapeutic strategy for osteochondral regeneration in OA.
  • This approach addresses the need for effective cartilage repair in disease-relevant models.