In Vitro and In Vivo Comparison of Different Types of Rabbit Mesenchymal Stem Cells for Cartilage Repair

Area of Science:

• Regenerative Medicine
• Stem Cell Biology
• Orthopedic Research

Background:

• Cartilage lesions are a growing clinical concern.
• Mesenchymal stem cells (MSCs) are increasingly used in clinical studies for cartilage repair.
• The comparative potential of MSCs from different tissues for cartilage regeneration remains underexplored.

Purpose of the Study:

• To comparatively evaluate the potential of rabbit mesenchymal stem cells (MSCs) from bone marrow (BMMSCs), adipose tissue (AMSCs), and ears (EMSCs) for treating cartilage defects.
• To assess both in vitro characteristics and in vivo efficacy of MSCs from different sources in a rabbit knee model.

Main Methods:

• MSCs were isolated from rabbit bone marrow, adipose tissue, and ears, then cultured in vitro.
• In vitro analysis included growth rate assessment and chondrogenic differentiation potential using real-time PCR.
• In vivo study involved creating cartilage defects in rabbit knees and transplanting MSCs within a collagen scaffold, followed by histological and gene expression analysis.

Main Results:

• Adipose-derived MSCs (AMSCs) exhibited the highest proliferation rate but the lowest chondrogenic potential.
• Ear-derived MSCs (EMSCs) demonstrated significantly higher growth rates and cartilage differentiation potential compared to bone marrow MSCs (BMMSCs).
• Both BMMSC- and EMSC-seeded scaffolds effectively improved cartilage defects within 4 weeks, while scaffolds with cartilage pellets showed no improvement.

Conclusions:

• Mesenchymal stem cells (MSCs) derived from rabbit ears possess cartilage regeneration capabilities comparable to those from bone marrow.
• The high proliferation rate and ease of harvesting make ear-derived MSCs a valuable resource for regenerative medicine applications.
• This study highlights the potential of EMSCs as an alternative source for treating cartilage defects.