通过细胞自主和非自主机制,PTEN抑制SHH髓母细胞的生长
Zhimin Lao1, Salsabiel El Nagar1,2, Yinwen Liang1
1Developmental Biology Program, Sloan Kettering Institute, Memorial Sloan Kettering Cancer Center, New York 10065, NY, USA.
bioRxiv : the preprint server for biology
|August 6, 2025
概括
在Sonic hedgehog medulloblastoma (SHH-MB) 中的PTEN损失加速了瘤的生长和分化. 这表明PTEN突变可能会对SHH-MB患者的结果产生负面影响,特别是生殖系突变.
科学领域:
- 神经瘤学神经瘤学
- 癌症基因组学 癌症基因组学
- 发展生物学 发展生物学
背景情况:
- 骨髓母细胞瘤 (MB) 是一种具有明显分子子组的儿科脑瘤.
- 在三分之一的MB病例 (SHH-MB) 中,Sonic hedgehog (SHH) 信号通路被激活.
- 二次突变,如PTEN中的突变,在SHH-MB严重性的作用尚不清楚.
研究的目的:
- 研究PTEN损失对SHH-MB瘤进展和分化的影响.
- 为了确定与SHH-MB中PTEN损失相关的细胞和转录变化.
主要方法:
- 利用散的SHH-MB小鼠模型,在小脑颗粒细胞前体 (GCP) 中表达瘤性SmoM2.
- 在这些模型中诱导了Pten的异合和同合损失.
- 采用单细胞RNA测序 (scRNA-seq) 进行细胞和转录概况.
主要成果:
- 在SHH-MB小鼠模型中,同卵性Pten损失迅速加速瘤生长和疾病进展.
- 异合体Pten的丧失最初导致了增加的增殖和原始状态,随后是瘤的快速分化.
- 丢失Pten减少了巨细胞透和细胞毒性在差异化的瘤区域,表明非自主效应.
结论:
- PTEN突变,特别是生殖系,可能会对SHH-MB的结果产生负面影响.
- 失去PTEN促进了SHH-MB的快速分化和改变瘤微环境.
- 了解PTEN的作用对于开发针对SHH-MB的向疗法至关重要.
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