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Distinct Neural Stem Cell Populations Give Rise to Disparate Brain Tumors in Response to N-MYC

机译:不同的神经干细胞群体对N-MYC的反应导致不同的脑肿瘤

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摘要

The proto-oncogene MYCN is mis-expressed in various types of human brain tumors. To clarify how developmental and regional differences influence transformation, we transduced wild-type or mutationally stabilized murine N-myc T58A into neural stem cells (NSCs) from perinatal murine cerebellum, brain stem, and forebrain. Transplantation of N-myc WT NSCs was insufficient for tumor formation. N-myc T58A cerebellar and brain stem NSCs generated medulloblastoma/primitive neuroectodermal tumors, whereas forebrain NSCs developed diffuse glioma. Expression analyses distinguished tumors generated from these different regions, with tumors from embryonic versus postnatal cerebellar NSCs demonstrating Sonic Hedgehog (SHH) dependence and SHH independence, respectively. These differences were regulated in part by the transcription factor SOX9, activated in the SHH subclass of human medulloblastoma. Our results demonstrate context-dependent transformation of NSCs in response to a common oncogenic signal.
机译:原癌基因MYCN在各种类型的人脑肿瘤中均错误表达。为了阐明发育差异和区域差异如何影响转化,我们将野生型或突变稳定的鼠N-myc T58A转化为围产期鼠小脑,脑干和前脑的神经干细胞(NSC)。 N-myc WT NSC的移植不足以形成肿瘤。 N-myc T58A小脑和脑干NSC产生髓母细胞瘤/原始神经外胚层肿瘤,而前脑NSC则发展为弥漫性神经胶质瘤。表达分析区分了从这些不同区域产生的肿瘤,胚胎小脑干细胞和出生后小脑干细胞的肿瘤分别显示了声波刺猬(SHH)依赖性和SHH独立性。这些差异部分受人类髓母细胞瘤SHH亚型中激活的转录因子SOX9调控。我们的结果表明,NSCs依赖于上下文依赖的转化是对常见致癌信号的响应。

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