重复性DNA元素的转录信号阻断了造血干细胞的细胞化
Cecilia Pessoa Rodrigues1,2, Joseph M Collins1,2, Song Yang1
1Howard Hughes Medical Institute, Boston Children's Hospital Boston, MA, USA.
概括
血造干细胞 (HSC) 的质量通过巨细胞的相互作用得到维持. 这项研究将Beta-2-微球蛋白 (B2m) 确定为"不要吃我"信号,揭示了HSC增殖和克隆性是如何调节的.
科学领域:
- 血液学
- 免疫学
- 干细胞生物学
背景情况:
- 巨细胞通过细胞表面的卡尔雷蒂库林 (Calr) 作为"吃我"信号来维护造血干细胞 (HSC) 的功能.
- 反应性氧物种 (ROS) 诱导卡尔表达,信号巨细胞清除老化或受损的HSCs.
研究的目的:
- 识别高细胞与巨细胞相互作用的新型调节剂.
- 了解HSC质量控制和扩散的分子机制.
主要方法:
- 斑马鱼的遗传学可以识别关键的调节分子.
- 对调节HSC表面标记物的化合物进行化学选.
- 全基因组CRISPR-Cas9查以确定调节β-2-微球蛋白 (B2m) 表达的基因.
- 对重复元素 (RE) 转录和托尔类受体3 (Tlr3) 信号的分析.
主要成果:
- 乙-2-微球蛋白 (B2m) 被确定为HSC的关键"不要吃我"信号.
- 化学查发现了促进HSC增殖的Calr诱导剂,而不会增加ROS或巨细胞清除量.
- 发现托尔类受体3 (Tlr3) 信号调节B2m表达.
- 针对B2m或Tlr3降低了HSC克隆性,而B2m升高与高RE转录表达相关.
结论:
- 在HSC上卡尔瑞图林 (Calr) 和β - 2微球蛋白 (B2m) 之间的平衡调节了巨细胞的相互作用.
- 与重复元素相关的双链RNA可能与TLR3相互作用,在造血干细胞和原始细胞上调节B2m.
- 这些发现为定义造血克隆性和HSC质量控制机制提供了洞察力.
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