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This study shows that chemical crosslinking of hyaluronic acid hydrogels with mesenchymal stem cells is a viable alternative to UV crosslinking for cartilage repair. This method enables the creation of anatomically shaped cartilage implants using rapid prototyping for complex joint defects.

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Regenerative Medicine

Background:

  • Cartilage has limited healing capacity, necessitating advanced repair strategies.
  • Existing methods like UV crosslinking of hyaluronic acid (HA) hydrogels with mesenchymal stem cells (MSCs) are effective but incompatible with rapid prototyping for complex shapes.
  • Alternative cytocompatible crosslinking methods are needed for fabricating patient-specific cartilage constructs.

Purpose of the Study:

  • Compare ammonium persulfate/N,N,N',N'-tetramethylethylenediamine (APS/TEMED) chemical crosslinking with UV crosslinking for MSC-seeded HA hydrogel functional maturation.
  • Develop rapid prototyping of anatomic molds for complex joint surfaces.
  • Generate anatomic MSC-seeded HA hydrogel constructs using APS/TEMED crosslinking for cartilage defect repair.

Main Methods:

  • Juvenile bovine MSCs were suspended in methacrylated HA (MeHA) and crosslinked via UV or APS/TEMED.
  • Anatomic molds of porcine femoral heads were created using microCT and 3D printing.
  • Molded HA constructs were fabricated using APS/TEMED crosslinking and cultured for 12 weeks with TGF-β3.

Main Results:

  • Both UV- and APS/TEMED-crosslinked constructs demonstrated increased mechanical properties and matrix deposition (proteoglycan, collagen) over 12 weeks.
  • APS/TEMED constructs exhibited higher mechanical moduli than UV constructs at 12 weeks.
  • Molded constructs maintained shape and showed enhanced matrix deposition at edges, with abundant collagen type II and minimal type I.

Conclusions:

  • APS/TEMED chemical crosslinking is a viable method for producing MSC-seeded HA-based neocartilage.
  • This crosslinking technique is compatible with rapid prototyping for creating patient-specific HA constructs.
  • Anatomic MSC-seeded HA constructs can be generated for treating large, complex chondral defects or for biologic joint replacement.