Exosome-Mediated Enhancement of Fat Graft Retention: A Comparative Preclinical Study with Stromal Vascular Fraction.

Evidence from laboratory and animal studies provides groundwork for understanding mechanisms and potential before human studies continue.

• Level A · Stronger Clinical Evidence
• Level B · Emerging clinical evidence with positive signals
• Level C · Early human research exploring benefits
• Level D · Scientific groundwork from lab and animal studies
• Emerging · Emerging topic under active research

Abstract (original English)

Background Cell-assisted lipotransfer (CAL) is a fat grafting technique that enhances graft survival by supplementing grafts with autologous stromal vascular fraction (SVF) or adipose-derived stromal cells (ASCs). However, its clinical translation has been hindered owing to inherent biological variability, potential cell viability issues, tumorigenic risk, and the complex regulatory landscape associated with cell-based therapies. To overcome these challenges, exosome has gained increasing attention as a promising non-cellular therapeutic modality capable of preserving key regenerative functions while minimizing relative concerns. This study aimed to compare the efficacy of SVF-enriched lipotransfer with fat co-transplanted with exosomes from ASCs to identify a reliable and clinically applicable non-cellular strategy for optimizing fat graft outcomes. Methods In vivo, minced human fat tissue mixed with phosphate-buffered saline, SVF cells, or exosomes was grafted into nude mice. Grafts were evaluated through microcomputed tomography at weeks 4 and 8 post-grafting and histological analysis at weeks 1 and 8 post-grafting. Results The exosome group showed a significantly higher volume retention rate than the control group at weeks 4 and 8 post-grafting. Histological analysis revealed that exosomes exhibited more pronounced effects in reducing inflammation, preserving perilipin-posi

Evidence level

Evidence from laboratory and animal studies provides groundwork for understanding mechanisms and potential before human studies continue.

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