Enhancement of Rotator Cuff Regeneration via Injectable Spheroidal Adipose-Derived Stem Cell Cluster-Collagen...

Area of Science:

• Regenerative Medicine
• Biomaterials Science
• Orthopedic Surgery

Background:

• Rotator cuff repair often leads to scar tissue formation, compromising tendon strength and increasing re-tear risks.
• Current treatments lack effective tendon regeneration, highlighting the need for novel therapeutic strategies.

Purpose of the Study:

• To evaluate the regenerative potential of an injectable formulation combining adipose-derived stem cell (ADSC) clusters with collagen for rotator cuff repair.
• To assess the histological and biomechanical outcomes, as well as the safety profile, of this novel therapeutic approach in an animal model.

Main Methods:

• Adipose-derived stem cells (ADSCs) were cultured into spheroids and combined with collagen.
• Rats with surgically induced rotator cuff injuries received injections of either no treatment, spheroids alone, collagen alone, or the combined spheroid-collagen formulation.
• Tendon healing was analyzed using histological staining and biomechanical testing, while safety was assessed through biodistribution, toxicity, and tumorigenicity studies.

Main Results:

• The combined spheroid-collagen group demonstrated significantly improved histological scores and tendon strength compared to control groups.
• Gene expression analysis revealed upregulation of regeneration-related transcription factors in ADSCs and the spheroid-collagen complex.
• Safety assessments confirmed no off-target cell migration, toxicity, or tumor formation, with sustained cell presence at the injection site for up to 16 weeks.

Conclusions:

• The injectable formulation of ADSC clusters and collagen effectively enhanced rotator cuff tissue regeneration in an animal model.
• The demonstrated safety and cell persistence suggest this formulation's potential as a cell-based therapeutic for clinical rotator cuff repair.