Superovulation using the combined administration of inhibin antiserum and equine chorionic gonadotropin increases the number of ovulated oocytes in C57BL/6 female mice.
Authors: Takeo Toru, Nakagata Naomi
Journal: PloS one
Summary
# Editorial Summary This research investigates superovulation protocols in C57BL/6 mice—the most commonly used strain for genetic engineering—by combining inhibin antiserum (IAS) with equine chorionic gonadotropin (eCG), a departure from conventional protocols that rely on eCG followed by hCG alone. Using immature female mice, the authors compared ovulation outcomes across three treatment groups: IAS alone, eCG alone, and the combined IASe protocol, then validated oocyte quality through in vitro fertilisation and embryo transfer studies. The combined IASe approach yielded approximately threefold more ovulated oocytes than either agent administered individually, with resulting embryos developing normally through to live offspring—a significant improvement over existing superovulation methods. Oocytes obtained via IASe produced viable 2-cell embryos when fertilised with sperm from both standard and genetically engineered lines, and both fresh and cryopreserved embryos completed normal development following transfer. For professionals involved in research breeding programmes and genetic engineering projects, this dual-hormone protocol offers a practical means of substantially increasing oocyte yield from donor females, thereby improving breeding efficiency and reducing the number of animals required for producing transgenic or knockout lines.
Read the full abstract on PubMed
Practical Takeaways
- •Not applicable to equine practice — this is a laboratory mouse reproduction study with no direct relevance to horse management or treatment
- •The use of equine chorionic gonadotropin (eCG) in this murine study does not translate to practical equine clinical applications
- •While the paper uses an equine-derived hormone, the methodology is specific to laboratory mouse genetics and has no bearing on equine reproductive or clinical care
Key Findings
- •Combined inhibin antiserum and equine chorionic gonadotropin (IASe) increased ovulated oocytes approximately 3-fold compared to either agent alone in C57BL/6 mice
- •IASe-derived oocytes successfully developed into 2-cell embryos via in vitro fertilization with normal developmental capacity
- •Fresh and cryopreserved embryos from IASe superovulation protocol produced viable live pups following embryo transfer