In vitro fertilization embryo development from caffeine-treated murine sperm

Area of Science:

• Reproductive Biology
• Toxicology
• Developmental Biology

Background:

• Caffeine is a widely consumed stimulant with potential effects on various physiological processes.
• Understanding caffeine's impact on male reproductive health is crucial due to its prevalence.

Purpose of the Study:

• To investigate the long-term effects of caffeine administration on male mouse sperm.
• To assess the subsequent impact on in vitro fertilization (IVF) and early embryo development.

Main Methods:

• Male mice received daily caffeine injections (0, 0.2, 1.0 mg/mouse) for one month.
• Sperm was collected, and IVF rates were evaluated.
• Embryo development to the blastocyst stage was assessed post-fertilization.

Main Results:

• Caffeine administration at 1.0 mg/day significantly decreased body weight.
• While testicular histology and testosterone levels remained unchanged, IVF rates showed a significant decrease at the 0.2 mg/day dose.
• Blastocyst formation rates declined significantly and in a dose-dependent manner with increasing caffeine levels.

Conclusions:

• Long-term caffeine exposure in male mice affects body weight but not testicular parameters or testosterone.
• Sperm from caffeine-treated mice resulted in significantly reduced blastocyst formation rates post-IVF.
• Caffeine negatively impacts male reproductive capacity and subsequent embryo development.