在老鼠丸中非精子形成的精子干细胞的年龄依赖的克隆扩张
Terumichi Kawahara1, Shinnosuke Suzuki2,3, Toshinori Nakagawa2,3
1Graduate School of Agricultural Science, Tohoku University, Sendai, Japan.
Aging cell
|February 22, 2025
概括
衰老的雄性哺乳动物表现出精子干细胞 (SSC) 行为的变化. 不形成精子的SSC克隆在老化丸中扩张,可能减少精子的生产和多样性.
科学领域:
- 生殖生物学 生殖生物学
- 干细胞生物学 干细胞生物学
- 老年学是一门学科.
背景情况:
- 精子干细胞 (SSC) 在雄性哺乳动物中维持一生的精子生产.
- 由于累积的突变,SSC的克隆行为会影响精子基因组的多样性.
- 丸允许SSC迁移和扩张.
研究的目的:
- 为了研究生理衰老对SSC在丸内的克隆命运的影响.
- 了解衰老如何影响SSC的增殖,迁移和对精子生成的贡献.
主要方法:
- 单细胞RNA测序以分析SSC中的基因表达异质性.
- 血统追踪来追踪SSC对精子形成的贡献.
- 静脉直视成像用于观察老鼠丸中的SSC行为.
主要成果:
- 在老化过程中,未分化的精子保留了基因表达异质性.
- GFRα1+ SSCs表现出加速的增殖和运动性,在老年小鼠中继续发挥作用.
- 低Egr4和Cops5表达的SSCs的一个子集无法形成精子,并且在老丸中空间扩展,与年轻丸不同.
结论:
- 衰老会在丸内的SSC中诱导特定的克隆特征.
- 不形成精子的SSC克隆的扩张可能会限制功能性SSC的可用性,并减少精子的生产和多样性.
- 这些发现提供了有关干细胞衰老机制和生殖衰老的见解.
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