Case Report: Use of Amniotic Microvesicles for Regenerative Medicine Treatment of a Mare With Chronic Endometritis.
Authors: Lange-Consiglio Anna, Funghi Federico, Cantile Carlo, Idda Antonella, Cremonesi Fausto, Riccaboni Pietro
Journal: Frontiers in veterinary science
Summary
# Editorial Summary Chronic endometritis remains a significant cause of subfertility in mares, characterised by degenerative changes to the endometrial tissue that impair the immunological and molecular dialogue necessary for successful embryo implantation, yet conventional treatments struggle to restore functional endometrial architecture. This case report describes a novel regenerative approach using amniotic-derived microvesicles (MVs)—small extracellular vesicles capable of horizontal transfer of microRNAs and other bioactive molecules—administered intrauterinely to an 11-year-old Friesian mare with a five-year history of implantation failure despite multiple insemination attempts with proven-fertility stallions. Following two treatment cycles with amniotic MVs, the mare demonstrated improved endometritis classification, successful embryo recovery and implantation at day 14, with an ongoing pregnancy at the time of reporting. The mechanism likely involved MV-mediated anti-inflammatory signalling and restoration of endometrial tissue microarchitecture, thereby re-establishing the fetal-maternal communication essential for implantation. Whilst this single case cannot establish clinical efficacy, it suggests regenerative medicine approaches warrant further investigation as a potential therapeutic option for mares with treatment-resistant chronic endometritis, particularly those with documented implantation failure rather than oocyte or embryonic defects.
Read the full abstract on PubMed
Practical Takeaways
- •Amniotic microvesicles represent a novel regenerative approach for mares with chronic endometritis and recurrent implantation failure, though evidence is currently limited to a single case
- •This treatment may work by reducing inflammation and restoring endometrial function rather than treating infectious endometritis, making it applicable to degenerative rather than infectious cases
- •Further controlled trials are needed before adoption into clinical practice; this case warrants follow-up studies to assess reproducibility and optimal treatment protocols
Key Findings
- •A single mare with chronic endometritis and recurrent implantation failure achieved successful embryo implantation and ongoing pregnancy following two cycles of intrauterine amniotic microvesicle administration
- •Endometritis classification improved following microvesicle treatment, suggesting restoration of endometrial tissue
- •Amniotic microvesicles may restore fetal-maternal communication through anti-inflammatory and regenerative paracrine effects