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Thermosensitive Injectable Gradient Hydrogel-Induced Bidirectional Differentiation of BMSCs.

Gangyuan Bi1,2,3,4,5, Sa Liu2,3,4,5,6, Xiupeng Zhong2,3,4,5,6

  • 1School of Biomedical Sciences and Engineering, South China University of Technology, Guangzhou, 511442, P. R. China.

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Summary

Injectable gradient hydrogels made from bioactive glass and gellan gum show promise for osteochondral defect repair. These novel materials promote cell growth and differentiation, offering a less invasive treatment option.

Keywords:
biomimeticschondrogenic differentiationgradient hydrogelinjectabilityosteogenic differentiationthermosensitivity

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Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Tissue Engineering

Background:

  • Osteochondral defects significantly impair patient quality of life.
  • Current treatments often involve invasive procedures and may not fully restore tissue function.
  • There is a need for advanced biomaterials that can facilitate less invasive and integrated repair of osteochondral defects.

Purpose of the Study:

  • To develop thermosensitive injectable gradient hydrogels for osteochondral defect repair.
  • To investigate the potential of bioactive glass (BG) and gellan gum (GG) in creating these gradient hydrogels.
  • To evaluate the physicochemical properties, cytocompatibility, and in vivo efficacy of the developed hydrogels.

Main Methods:

  • Fabrication of gradient hydrogels (B0.5G, B1G) using a gradient-mixing injection device.
  • Characterization of hydrogel composition, structure, and morphology using physicochemical methods.
  • Assessment of hydrogel mechanical properties and cytocompatibility with bone marrow mesenchymal stem cells (BMSCs).
  • Evaluation of BMSC differentiation using qRT-PCR.
  • In vivo testing in porcine osteochondral defects.

Main Results:

  • Thermosensitive injectable gradient hydrogels (B0.5G, B1G) were successfully prepared with an upper critical solution temperature (UCST) range of 37.7-40.2 °C.
  • Gradient hydrogels exhibited superior mechanical properties compared to pure gellan gum hydrogels.
  • B0.5G gradient hydrogels demonstrated excellent cytocompatibility, promoting BMSC proliferation.
  • These hydrogels induced simultaneous osteogenic and chondrogenic differentiation of BMSCs.
  • In vivo studies showed seamless filling of irregular defects with B0.5G hydrogel in a less invasive manner.

Conclusions:

  • Thermosensitive injectable B0.5G gradient hydrogels represent a promising biomaterial for osteochondral defect repair.
  • The developed hydrogels offer a less invasive approach by enabling controlled injection and defect filling.
  • These materials have the potential to promote integrated repair by inducing both bone and cartilage formation.
  • Further research may lead to improved clinical treatments for osteochondral defects.