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免疫细胞亚型的表观基因组分析揭示了长时间太空飞行后的H3K27ac标记的压力特征
Tabea L Fullstone1, Lukas F J Fischer1, Maria Bohmeier2
1Department of Molecular Biochemistry, Institute of Biochemistry, University of Stuttgart, 70569, Stuttgart, Germany.
Scientific reports
|September 12, 2025
概括
太空飞行改变了免疫细胞的表观遗传学,影响了基因调节和细胞适应. 一些变化在返回后持续很长时间,影响宇航员的健康,并提供有关地球免疫系统疾病的见解.
科学领域:
- 太空生物学和免疫学
- 表观遗传学和分子生物学
背景情况:
- 长时间的太空飞行会引起显著的生理压力,特别是影响宇航员的免疫功能.
- 了解免疫系统的适应和潜在的长期健康风险对于扩展太空任务至关重要.
研究的目的:
- 在长期轨道太空飞行之前,期间和之后调查宇航员免疫细胞的表观遗传修饰.
- 分析CD4+和CD8+T细胞中基因组修饰的变化,特别是H3K27ac,以了解免疫细胞对太空飞行的反应.
主要方法:
- 在目标下使用切割和标记 (Cut&Tag) 试验来映射H3K27ac基因组修饰.
- 在多个时间点收集和分析宇航员的免疫细胞 (CD4+和CD8+T细胞):飞行前,飞行后立即,以及恢复期间.
主要成果:
- 确定了T细胞中染色质可访问性的显著变化,与免疫反应,基因调节和细胞适应途径有关.
- 观察到过渡性和持久性表观遗传变化,其中一些修改在太空飞行后的50天内仍然明显.
- 证明了太空飞行持续时间与免疫细胞表观遗传变化之间的明显联系.
结论:
- 免疫细胞的表观遗传变化是长时间太空飞行的重要反应.
- 持续的表观遗传变化表明,这可能会对宇航员的长期健康产生影响.
- 研究结果提供了关于在压力下免疫调节的见解,与太空健康和地球条件相关,如免疫缺陷,癌症表观遗传学和衰老.
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