Black Tea High-Molecular-Weight Polyphenol Increases the Motility of Sea Urchin Sperm by Activating Mitochondrial Respiration

  • KIKUCHI Ayako
    Graduate School of Life and Environmental Sciences, University of Tsukuba
  • SHIBA Kogiku
    Shimoda Marine Research Center, University of Tsukuba
  • OZAWA Tetsuo
    Shizuoka Industrial Foundation
  • NAKANO Kentaro
    Graduate School of Life and Environmental Sciences, University of Tsukuba
  • INABA Kazuo
    Shimoda Marine Research Center, University of Tsukuba
  • NUMATA Osamu
    Graduate School of Life and Environmental Sciences, University of Tsukuba

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Mitochondria activation factor (MAF) is a high-molecular-weight polyphenol purified from black tea that activates mitochondrial respiration. It increased the mitochondrial membrane potential and motility of sea urchin sperm, by up to 8%, to the same extent as sperm-activating peptides (SAPs) secreted by the egg. Unlike SAPs, MAF had no effect on sperm swimming behavior, suggesting that the mechanism of sperm activation by MAF is different from that of SAPs.

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