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大核细胞的一个子集调节了造血干细胞前体的发育
Wenlang Lan1, Jinping Li1, Zehua Ye1
1Key Laboratory of Functional Proteomics of Guangdong Province, Department of Developmental Biology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China.
The EMBO journal
|April 5, 2024
概括
巨核细胞对于小鼠胚胎中的造血干细胞 (HSC) 发育至关重要. 这些细胞在大动脉 - 淋巴体 - 中膜区域促进HSC的产生和成熟,作为关键的微环境调节者.
科学领域:
- 发育生物学 发展生物学
- 血液形成 血液形成 血液形成
- 干细胞生物学 干细胞生物学
背景情况:
- 造血造血干细胞 (HSC) 产生对于血液形成至关重要,并且在胚胎发生过程中需要精确的调节.
- 巨核细胞以血小板生产而闻名,在胚胎大动脉 - 淋巴体 - 中 (AGM) 区域内在HSC发育中发挥着非特征性的作用.
研究的目的:
- 研究巨核细胞在胚胎AGM的HSC规范和发育中的作用.
- 确定巨核细胞影响高细胞生成和成熟的机制.
主要方法:
- 使用PF4-Cre;Rosa-td 番茄记者小鼠来追踪HSC利基中的巨核细胞.
- 采用PF4-Cre;Rosa-DTA耗尽模型来评估巨核细胞缺乏对高细胞的影响.
- 进行了OP9-DL1共同培养实验,以研究内皮细胞到血液形成的转变.
- 进行单细胞RNA测序,以确定特定的巨核细胞亚群和分子媒介.
主要成果:
- 在小鼠胚胎中,巨核细胞缺乏会影响HSC前生成和成熟,改变AGM区域的HSC活性.
- 发现巨核细胞在体外促进了内皮细胞到血液细胞的转变.
- 一个CD226阳性巨核细胞的亚群被确定为通过TNFSF14分泌的血源性内皮细胞命运的强有力的促进者.
- 外源性TNFSF14治疗在大核细胞贫乏培养物中恢复了造血细胞功能.
结论:
- 大核细胞是胚胎血液形成的关键微环境调节者,促进HSC前的产生和成熟.
- 这项研究阐明了巨核细胞,特别是分泌TNFSF14的CD226+细胞在控制HSC特异性和发育中的新型作用.
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