Effects of acellular equine amniotic allografts on the healing of experimentally induced full-thickness distal limb wounds in horses.
Authors: Fowler Alexander W, Gilbertie Jessica M, Watson Victoria E, Prange Timo, Osborne Jason A, Schnabel Lauren V
Journal: Veterinary surgery : VS
Summary
# Editorial Summary Equine amniotic membrane allograft (eAM) products such as StemWrap contain therapeutically relevant concentrations of growth factors including TGF-β1, VEGF, and PGE2, which are known mediators of tissue repair and angiogenesis. In a controlled experimental study on eight horses, researchers created matched full-thickness skin wounds on both forelimbs and compared eAM treatment against untreated controls and silicone dressing applications, measuring wound closure rates, granulation tissue formation, and healing quality over four weeks. Whilst eAM treatment did not accelerate overall healing time or alter the final histological quality of healed tissue compared to controls, wounds treated with the allograft demonstrated significantly increased granulation tissue production by day 7, suggesting an early proliferative response. This finding indicates that eAM products may offer practical value in managing larger or contaminated distal limb wounds where rapid granulation tissue formation is desired to support secondary healing, though practitioners should recognise that the accelerated early tissue response does not translate to faster wound closure or superior scar quality in standardised experimental conditions.
Read the full abstract on PubMed
Practical Takeaways
- •eAM products may be beneficial for substantial wounds where rapid granulation tissue production is needed, though they do not accelerate overall healing time
- •eAM appears safe and does not compromise final wound healing quality compared to standard dressings
- •Consider eAM for wounds requiring prompt vascularization and tissue fill rather than for faster closure
Key Findings
- •StemWrap+ contained moderate concentrations of TGF-β1 (494.10 pg/mL), VEGF (212.52 pg/mL), and PGE2 (1811.61 pg/mL)
- •Equine amniotic membrane allograft did not affect time to healing or histologic quality compared to control groups
- •eAM treatment was associated with increased granulation tissue production early in healing, particularly on day 7