Comparison of chondrogenic potential in equine mesenchymal stromal cells derived from adipose tissue and bone marrow.
Authors: Vidal Martin A, Robinson Sandra O, Lopez Mandi J, Paulsen Daniel B, Borkhsenious Olga, Johnson Jill R, Moore Rustin M, Gimble Jeffrey M
Journal: Veterinary surgery : VS
Summary
# Editorial Summary Bone marrow-derived mesenchymal stromal cells (MSCs) demonstrate significantly superior chondrogenic capacity compared to adipose tissue-derived cells (ASCs) in equine applications, a distinction that has important implications for selecting cell sources in cartilage regeneration therapies. Researchers cultured cryopreserved MSCs and ASCs from 11 Thoroughbreds under control conditions and with chondrogenic induction (using TGF-β3 and BMP-6), then analysed pellet cultures over 21 days for collagen type II synthesis, glycosaminoglycan (GAG) deposition, matrix composition, and cellular morphology. MSC cultures showed robust type II collagen synthesis from day 7 onwards and developed hyaline-like cartilage matrix by day 14—neither of which was consistently observed in ASC cultures—whilst growth factor supplementation significantly enhanced GAG concentration (P<0.0001) and pellet size (P<0.004) specifically in MSC populations after two weeks. These findings suggest that bone marrow represents the superior cell source for equine cartilage repair protocols, though the differential growth factor responsiveness of equine ASCs hints at species-specific characteristics that warrant further investigation of receptor expression profiles to optimise cell selection and culture conditions for regenerative therapies.
Read the full abstract on PubMed
Practical Takeaways
- •If considering stem cell therapy for cartilage repair in horses, bone marrow-derived cells appear more effective than fat-derived cells based on this in vitro evidence—discuss source selection with your veterinarian
- •This foundational research supports further clinical development of MSC-based regenerative therapies, but clinical efficacy studies are still needed before widespread adoption
- •Understanding cellular responses to growth factors may eventually allow optimization of regenerative protocols, though clinical applications remain investigational
Key Findings
- •Equine bone marrow-derived MSCs demonstrated superior chondrogenic potential compared to adipose tissue-derived ASCs, with collagen type II synthesis predominantly observed from Day 7 onward in MSC pellets
- •MSC pellets developed hyaline-like matrix by Day 14, whereas ASC cultures did not achieve this cartilage-like structure over the 21-day study period
- •Growth factors TGFβ3 and BMP-6 significantly enhanced MSC glycosaminoglycan concentration (P<0.0001) and pellet size (P<0.004) after 2 weeks of culture
- •Glycosaminoglycan deposition occurred earlier in MSC cultures compared with ASC cultures, suggesting species-specific differences in growth factor responsiveness