氨酸缺乏会通过氧化应激和DNA损伤反应途径引起精子细胞亡
Weiyong Wang1, Yong Ruan2, Gong Ting3
1Key Laboratory of Animal Genetics, Breeding and Reproduction in the Plateau Mountainous Region, Ministry of Education, Guizhou University, Guiyang, 550025, Guizhou, China. wangwy08@outlook.com.
Biological research
|November 11, 2025
概括
甲氨酸缺乏会通过减少细胞增殖和增加细胞亡来损害早期的精子生成. 这发生在氧化应激和DNA损伤的过程中,突显了 metionin 在男性生育能力中的关键作用.
科学领域:
- 生殖生物学 生殖生物学
- 营养科学 营养科学
- 细胞生物学 细胞生物学
背景情况:
- 氨酸对于蛋白质合成和氧化还原平衡至关重要.
- 氨酸的限制会对精液质量产生负面影响.
- 早期的精子生成和甲氨酸缺乏的影响尚不清楚.
研究的目的:
- 调查 metionin 在早期精子生成中的作用.
- 阐明 metionin 剥夺引起的缺陷的机制.
- 探索潜在的干预措施.
主要方法:
- 采用了一种甲胺饮食模式 (0.86%,0.17%,0%).
- 评估了精子细胞的增殖和亡.
- 分析了与线粒体功能,ISR和DNA损伤相关的基因和蛋白质表达.
- 评估了线粒体功能和氧化应激标志物.
- 经过测试的N-乙半氨酸 (NAC) 干预.
主要成果:
- metionin 剥夺抑制了精子的增殖和增加了细胞亡.
- 观察到线粒体基因 (Gpx4,Fis1,Gstm1) 的下调和ISR (Atf4,Chac1,Ddit3) 和DNA损伤基因 (Cdkn1a,Chek2,Atm) 的上调.
- 甲氨酸剥夺诱导了线粒体功能障碍 (膜潜在脱极化,ROS,MitoSOX积累).
- 增加的DNA损伤 (γH2AX,p-CHK2,p-p53) 和亲细胞亡蛋白 (PUMA,BAX,c-PARP1),与减少的抗细胞亡BCL2.
- 在GC-1细胞中,NAC逆转了GC-1细胞的增殖缺陷.
结论:
- 氨酸缺乏激活了综合应激反应 (ISR).
- 通过氧化应激和CHK2-p53/p21通路,ISR激活导致精子细胞亡.
- 氨酸对于早期的精子生成至关重要;饮食干预可能会影响生殖健康.
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