Comparative study of the spermatogonial stem cell niche system in the sertoli valve.

• Project/Area Number: 18K05953
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 42010:Animal production science-related
• Research Institution: Nihon University
• Principal Investigator: TSUNEKAWA Naoki 日本大学, 生物資源科学部, 教授 (50431838)
• Project Period (FY): 2018-04-01 – 2022-03-31
• Project Status: Completed (Fiscal Year 2021)
• Budget Amount: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000); Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
• Keywords: 精原幹細胞 / ニッチシステム / 季節繁殖動物 / 精巣

Outline of Final Research Achievements

Because spermatogenesis in gerbils is poorly understood, we charted the 12 stages of the spermatogenesis cycle for the Slc strain used in this study. We performed immunostaining to examine the distribution of spermatogonial stem cells and observed that they were GFRα1-positive, suggesting that spermatogonial stem cells are effective markers for the spermatogonial stem cell niche system. Next, we cultured testicular tissues of immature mice, pigs, and cats using a gas&-liquid interface culture method established in mice. We observed active spermatogonial stem cell and spermatogonium division. Numerous spermatocytes were present in the cultured tissues; however, meiosis was rarely observed. This method was shown to be useful for observing spermatogonial stem cells. Future studies should conduct detailed observations of meiosis in gerbil spermatogenesis.

Academic Significance and Societal Importance of the Research Achievements

本研究課題の先には、精原幹細胞を利用した不妊治療への貢献、希少動物の保護、産業動物への応用が考えられる。直ちに応用できるような画期的な成果には辿り着いていないが、基礎研究、すなわち精子の幹細胞である精原幹細胞の基礎的な情報を得ることに成功した。マウスを材料に報告された成果に概ね一致しており、比較動物学的に普遍的な共通項目が見出された。特に、精巣組織の培養実験では、精原幹細胞が活発に増殖し、精母細胞へ分化を遂げる条件を発見した。これを、スナネズミ、ブタ、ネコを材料にして、複数の動物種で見出した成果は大きな貢献であり、他の動物種への展開が大いに期待される。

Research Products

• [Journal Article] Photoperiod-independent testicular development in the model newt Pleurodeles waltl (2021)
  • Author(s): Kyakuno, M. Nakamori, R. Tazawa, I. Uemasu, H. Namba, N. Tsunekawa, N. Noce, T. Satoh, Y. Takeuchi, T. Hayashi, T.
  • Journal Title: Dev Growth Differ Volume: 63 Issue: 6 Pages: 277-284
  • DOI: 10.1111/dgd.12738
  • Peer Reviewed
• [Journal Article] Low retinoic acid levels mediate regionalization of the Sertoli valve in the terminal segment of mouse seminiferous tubules (2021)
  • Author(s): Imura-Kishi Kasane、Uchida Aya、Tsunekawa Naoki、Suzuki Hitomi、Takase Hinako M.、Hirate Yoshikazu、Kanai-Azuma Masami、Hiramatsu Ryuji、Kurohmaru Masamichi、Kanai Yoshiakira
  • Journal Title: Scientific Reports Volume: 11 Issue: 1 Pages: 1110-1110
  • DOI: 10.1038/s41598-020-79987-4
  • Peer Reviewed / Open Access
• [Presentation] スナネズミを用いた in vitro精子発生の試み (2021)
  • Author(s): 韓笑、荻野季子、藤巻菜々子、金澤朋子、恒川直樹
  • Organizer: 第164回日本獣医学会学術集会
• [Presentation] ブタ精巣を用いたin vitro精子発生の試み (2018)
  • Author(s): 安田拓央、杉山まどか、金澤朋子、森友忠昭、恒川直樹
  • Organizer: 第161回日本獣医学会学術集会・獣医解剖分科会