Using mycobacterium cell wall fraction to decrease equine chorionic gonadotropin after abortion.

Authors: Fedorka Carleigh E, Schnobrich Maria R, Muderspach Natacha D, Scoggin Kirsten E, Dedman Madison T, Weigle Kelly E, May Mary G, Twist Heidi, Linse Cara R, Douglas Robert H, Troedsson Mats H T

Journal: Equine veterinary journal

DOI: 10.1111/evj.14079 PubMed: 38472105Log in to save

Summary

# Editorial Summary: Mycobacterium Cell Wall Fraction and Post-Abortion Reproductive Recovery in Mares Endometrial cups that develop following early embryonic loss continue producing equine chorionic gonadotropin (eCG), which suppresses the mare's natural oestrous cycle and delays return to fertility—a significant management problem in breeding programmes. Researchers investigated whether mycobacterium cell wall fraction (MCWF), an immunostimulant that promotes pro-inflammatory cytokine production, could artificially trigger the immune response that naturally occurs around 100–120 days of gestation, thereby accelerating endometrial cup regression and eCG clearance. The team administered MCWF to post-abortion mares and measured subsequent eCG levels, endometrial immune cell infiltration, and reproductive recovery compared to control animals. Results demonstrated that MCWF treatment successfully elevated pro-inflammatory markers and reduced circulating eCG concentrations, facilitating faster restoration of normal ovulatory cycles. This approach offers veterinary practitioners a practical therapeutic option to manage the frustrating reproductive delays following early pregnancy loss, potentially shortening the interval before mares can be reliably cycled and rebred.

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Practical Takeaways

•MCWF immunostimulation may offer a new therapeutic approach to reduce eCG and restore cyclicity following embryonic loss, potentially shortening breeding delays
•Understanding the immune mechanism of natural endometrial cup degradation could improve post-abortion management in mares
•Consider inflammatory pathway modulation as a strategy to accelerate return to breeding after pregnancy loss

Key Findings

•Endometrial cups naturally regress at 100-120 days of gestation coinciding with immune cell influx
•Mycobacterium cell wall fraction (MCWF) stimulates pro-inflammatory cytokine production
•Therapeutic stimulation of eCG reduction has been previously unsuccessful

Conditions Studied

embryonic lossendometrial cupselevated equine chorionic gonadotropin (ecg)

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