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Fabrication and Application of Rose Bengal-chitosan Films in Laser Tissue Repair
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Visible light crosslinkable chitosan hydrogels for tissue engineering.

Junli Hu1, Yaping Hou, Hyejin Park

  • 1Division of Advanced Prosthodontics, Biomaterials and Hospital Dentistry, University of California, Los Angeles, CA 90095, USA.

Acta Biomaterialia
|February 15, 2012
PubMed
Summary
This summary is machine-generated.

This study presents methacrylated glycol chitosan (MeGC) hydrogels for tissue engineering. Riboflavin (RF) initiation offers superior cell viability and mechanical strength for in situ gelling applications.

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Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Tissue Engineering

Background:

  • In situ gelling hydrogels are advantageous for delivering cells and growth factors in tissue engineering.
  • Methacrylated glycol chitosan (MeGC) is a promising biomaterial for hydrogel formation.
  • Visible light crosslinking offers a controllable method for hydrogel formation.

Purpose of the Study:

  • To develop and evaluate visible light crosslinkable MeGC hydrogel systems using different photoinitiators for tissue engineering.
  • To assess the impact of irradiation time and initiator type on hydrogel properties and encapsulated cell viability.
  • To demonstrate the potential of optimized hydrogels in cartilage defect models.

Main Methods:

  • Synthesis of MeGC hydrogels.
  • Evaluation of hydrogel crosslinking using camphorquinone (CQ), fluorescein (FR), and riboflavin (RF) under visible light.
  • Assessment of mechanical properties (compressive modulus), swelling ratio, and degradation rate.
  • Determination of encapsulated chondrocyte viability and proliferation.
  • In vivo testing in osteochondral and chondral defect models.

Main Results:

  • MeGC gels crosslinked with CQ or FR required longer irradiation times, leading to significantly reduced chondrocyte viability.
  • Riboflavin (RF) initiated MeGC gels demonstrated high cell viability (80-90%) with short irradiation times (40s).
  • Increasing irradiation time for RF-initiated gels enhanced mechanical strength without compromising cell viability.
  • RF-initiated MeGC hydrogels supported chondrocyte proliferation and extracellular matrix deposition.
  • Successful application in osteochondral and chondral defect models was demonstrated.

Conclusions:

  • Riboflavin-initiated MeGC hydrogels represent a promising photoinitiating system for in situ gelling applications in tissue engineering.
  • Optimized visible light crosslinking parameters are crucial for balancing hydrogel mechanics and cell viability.
  • These hydrogels show significant potential for cartilage tissue engineering and regenerative medicine.