SVF Cell Sheets as a New Multicellular Material-Based Strategy for Promoting Angiogenesis and Regeneration in Diced...

Area of Science:

• Regenerative Medicine
• Biomaterials Science
• Tissue Engineering

Background:

• Autologous diced cartilage grafts face limitations due to high adsorption and poor neovascularization.
• Developing effective strategies for cartilage regeneration and integration is crucial for clinical success.

Purpose of the Study:

• To investigate the efficacy of stromal vascular fraction (SVF) cell sheets in promoting cartilage regeneration.
• To evaluate the potential of SVF cell sheets as a substitute for perichondrium in cartilage grafting.

Main Methods:

• SVF cell sheets were produced from adipose-derived SVF using enzymatic digestion and a temperature-sensitive culture system.
• In vivo and in vitro experiments were conducted using a rabbit diced cartilage graft model.
• The study assessed cartilage regeneration, adsorption mitigation, neovascularization, and cellular mechanisms.

Main Results:

• SVF cell sheets significantly promoted cartilage regeneration and reduced adsorption in diced cartilage grafts.
• SVF cell sheets enhanced neovascularization and timely cartilage block formation by secreting VEGF and Ang-1.
• These cell sheets suppressed pyroptosis by downregulating NLRP3, Caspase1, and GSDMD expression.

Conclusions:

• SVF cell sheets act as a biocompatible biofilm, promoting angiogenesis and cartilage formation while reducing chondrocyte pyroptosis.
• This strategy presents a viable alternative for autologous cartilage grafting, addressing limitations of current methods.
• SVF cell sheets offer a potential solution for craniofacial defect reconstruction using natural autologous cartilage.