Effects of exposure to methylglyoxal on sperm motility and embryonic development after fertilization in mice

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  • NAKANO Tatsuya
    Graduate School of Biology-Oriented Science and Technology, Kindai University, Wakayama 649-6493, Japan IVF Namba Clinic, Osaka 550-0015, Japan
  • KONO Mizuki
    Department of Biology-Oriented Science and Technology, Kindai University, Wakayama 649-6493, Japan
  • SEGAWA Kazuki
    Department of Biology-Oriented Science and Technology, Kindai University, Wakayama 649-6493, Japan
  • KUROSAKA Satoshi
    Institute of Advanced Technology, Kindai University, Wakayama 642-0017, Japan
  • NAKAOKA Yoshiharu
    IVF Namba Clinic, Osaka 550-0015, Japan
  • MORIMOTO Yoshiharu
    HORAC Grandfront Osaka Clinic, Osaka 530-0011, Japan
  • MITANI Tasuku
    Graduate School of Biology-Oriented Science and Technology, Kindai University, Wakayama 649-6493, Japan Department of Biology-Oriented Science and Technology, Kindai University, Wakayama 649-6493, Japan

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<p> Methylglyoxal (MG) is a precursor for the generation of endogenous advanced glycation end-products involved in various diseases, including infertility. The present study evaluated the motility and developmental competence after in vitro fertilization of mouse sperm which were exposed to MG in the capacitation medium for 1.5 h. Sperm motility was analyzed using an SQA-V automated sperm quality analyzer. Intracellular reactive oxygen species (ROS), membrane integrity, mitochondrial membrane potential, and DNA damage were assessed using flow cytometry. The matured oocytes were inseminated with MG-exposed sperm, and subsequently, the fertilization and embryonic development in vitro were evaluated in vitro. The exposure of sperm to MG did not considerably affect the swim-up of sperm but resulted in a deteriorated sperm motility in a concentration-dependent manner, which was associated with a decreased mitochondrial activity. However, these effects was not accompanied by obvious ROS accumulation or DNA damage. Furthermore, MG diminished the fertilization rate and developmental competence, even after normal fertilization. Collectively, a short-term exposure to MG during sperm capacitation had a critical impact on sperm motility and subsequent embryonic development after fertilization. Considering that sperm would remain in vivo for up to 3 days until fertilization, our findings suggest that sperm can be affected by MG in the female reproductive organs, which may be associated with infertility.</p>

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