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Medium effects on capacitation and sperm penetration through the zona pellucida in inbred BALB/c spermatozoa

Seiji Kito1, Yuki Ohta

  • 1Research Center for Radiation Safety, National Institute of Radiological Sciences, Chiba, Japan. sk126@nirs.go.jp

Zygote (Cambridge, England)
|September 1, 2005
PubMed

Insights

Optimizing in vitro fertilization (IVF) for BALB/c mice requires specific media conditions. The study found that capacitating sperm in TYH medium and inseminating in modified human tubal fluid (mHTF) yields the best fertilization rates for this challenging strain.

Area of Science:

  • Reproductive Biology
  • In Vitro Fertilization
  • Mammalian Embryology

Background:

  • Inbred BALB/c mice present significant challenges for successful in vitro fertilization (IVF).
  • Understanding the role of specific culture media is crucial for overcoming fertilization barriers in mouse models.
  • Sperm capacitation and penetration through the zona pellucida (ZP) are critical steps affected by the surrounding medium.

Purpose of the Study:

  • To evaluate the efficacy of various media in supporting sperm capacitation and zona pellucida penetration for BALB/c mouse spermatozoa.
  • To identify optimal media combinations for improving IVF success rates in the BALB/c strain.

Main Methods:

  • Sperm capacitation and in vitro fertilization were performed using multiple media formulations, including TYH, M16, CZB, mWhitten, T6, mTyrode's, mKSOM, MEM, TCM199, and mHTF (control).
  • Fertilization was assessed by male pronuclear formation at 5 hours post-insemination (PI).
  • Sperm nuclear decondensation (SND) at 2 hours PI and sperm capacitation via chlortetracycline (CTC) staining were used as additional indicators of sperm function.

Main Results:

  • When sperm were capacitated and inseminated in the same medium, mHTF achieved the highest fertilization rate (~80%).
  • Sperm capacitated in TYH solution and then inseminated in mHTF showed significantly higher sperm nuclear decondensation (SND) (~93%) compared to other media (<45%) at 2h PI.
  • Chlortetracycline (CTC) staining revealed a higher percentage of capacitation in TYH solution (46%) compared to mHTF (28%) and other media (<24%).

Conclusions:

  • The most effective strategy for BALB/c mouse IVF involves capacitating sperm in TYH solution followed by insemination in mHTF.
  • Suboptimal sperm capacitation and insemination conditions likely contribute to the poor fertilization rates observed in BALB/c mice.
  • The choice of culture media significantly impacts IVF success, and strain-specific optimization is essential.

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