PAX3-FOXO1在内皮细胞前代体中决定了肌原性重编程和狂宫肌肉瘤身份
Madeline B Searcy1,2, Randolph K Larsen1,2, Bradley T Stevens1,2
1Department of Oncology, St. Jude Children's Research Hospital, Memphis, TN, 38105, USA.
Nature communications
|November 15, 2023
概括
融合阳性狂肌肉瘤 (FP-RMS) 起源于非肌肉细胞. PAX3-FOXO1 (P3F) 基蛋白重编程内皮原生细胞成为FP-RMS,揭示了这种侵袭性儿科癌症的新型细胞起源.
科学领域:
- 在瘤学瘤学.
- 发展生物学 发展生物学
- 细胞生物学 细胞生物学
背景情况:
- 融合阳性狂宫肌肉瘤 (FP-RMS) 是一种侵袭性的儿科癌症.
- FP-RMS的起源细胞尚不清楚,因为它类似于肌肉,但在非肌肉组织中产生.
研究的目的:
- 为了研究融合阳性狂宫肌肉瘤 (FP-RMS) 的起源细胞.
- 确定PAX3-FOXO1 (P3F) 蛋白是否可以将非肌原性细胞重新编程成FP-RMS.
主要方法:
- 使用了小鼠和人类内皮前代细胞.
- 在原生细胞中表达了PAX3-FOXO1 (P3F) 融合蛋白.
- 产生了一种新的FP-RMS小鼠模型,涉及P3F和Cdkn2a在内皮细胞中的损失.
- 使用TP53-null人类诱导多能干细胞 (iPSCs) 来评估分化途径.
主要成果:
- PAX3-FOXO1 (P3F) 表达重新编程小鼠和人类内皮细胞的祖先变成FP-RMS.
- 在aP2-Cre小鼠中,表达P3F的细胞分化为肌性干细胞,可再生肌肉.
- 在TP53-null人类iPSC中的P3F表达阻断了内皮分化,并促进了肌细胞形成,导致FP-RMS瘤.
- 使用P3F和Cdkn2a在内皮细胞中的损失建立了FP-RMS的新小鼠模型.
结论:
- FP-RMS可能源于非肌原性内皮细胞的异常发育.
- PAX3-FOXO1 (P3F) 基蛋白是重编程这些细胞向肌源性血统的关键驱动因素,导致FP-RMS.
- 这些发现挑战了对拉布多米索尔科马细胞起源的传统理解,并为其病变发生提供了新的见解.
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