Cell engraftment, vascularization, and inflammation after treatment of equine distal limb wounds with endothelial colony forming cells encapsulated within hydrogel microspheres.
Authors: Winter Randolph L, Tian Yuan, Caldwell Fred J, Seeto Wen J, Koehler Jey W, Pascoe David A, Fan Shirley, Gaillard Phillippe, Lipke Elizabeth A, Wooldridge Anne A
Journal: BMC veterinary research
Summary
# Editorial Summary Poor blood supply fundamentally limits healing in equine distal limb wounds, and enhancing vascularization through cell therapy represents a promising therapeutic avenue; this research investigated whether endothelial colony forming cells (ECFCs) suspended in injectable hydrogel microspheres could improve neovascularization and healing outcomes compared to naked cells or control treatments. Six horses received full-thickness dermal wounds on their distal limbs treated with one of four interventions: empty microspheres, serum control, free ECFCs, or ECFCs encapsulated within poly(ethylene) glycol fibrinogen microspheres, with researchers tracking cell persistence using quantum nanodot labeling and measuring wound surface area, granulation tissue quality, collagen deposition, and inflammatory cell infiltration over the healing timeline. Encapsulation of ECFCs within the microspheres successfully prolonged cell survival and localisation at the wound site compared to freely injected cells, and the ECFC/microsphere treatment group demonstrated enhanced vascularization with reduced inflammatory burden alongside improved collagen organisation in healing tissue. These findings suggest that hydrogel encapsulation protects injected ECFCs from the hostile wound environment whilst maintaining their therapeutic capacity, potentially offering equine practitioners a more effective cell-delivery strategy for managing chronic or poorly vascularised distal limb wounds. Further work translating this approach to clinical cases will clarify whether the improved cellular outcomes observed here translate into meaningful reductions in healing time and scar formation.
Read the full abstract on PubMed
Practical Takeaways
- •Cell encapsulation technology may offer a practical approach to improve cell survival and targeting in equine distal limb wounds, historically difficult to heal due to poor vascularity
- •Results suggest that autologous ECFC therapy could complement or enhance current wound management protocols, though clinical efficacy and cost-effectiveness require further investigation
- •This foundational work supports advancement toward clinical trials, but practitioners should await evidence from larger prospective studies before incorporating this technology into routine practice
Key Findings
- •Endothelial colony forming cells (ECFCs) were successfully isolated from 6 horses and tracked using quantum nanodot labeling in wound healing models
- •Encapsulation of ECFCs in poly(ethylene) glycol fibrinogen microspheres (PEG-Fb MS) enabled cell localization and improved retention at wound sites compared to naked cells
- •Treatment groups receiving ECFC/MS demonstrated measurable improvements in neovascularization, granulation tissue formation, and collagen deposition relative to control groups
- •Inflammatory response patterns differed between treatment groups, with encapsulated cells showing modulated inflammatory profiles compared to other treatments