Acta Neuropathologica:胶质母细胞瘤细胞状态的空间富集

2020-07-21 MedSci原创 MedSci原创

胶质母细胞瘤(GBM)是侵袭性脑肿瘤,由于遗传和表观遗传异质性以及胶质瘤干细胞的存在而无法治愈[。

作者确定细胞状态是否可能对应于肿瘤内的地形位置。 从研究中提取了细胞状态和增殖的基因表达谱,并将该数据应用于IvyGAP GBM数据库。研究发现这些新定义的细胞状态确实在GBM中的特定解剖位置丰富了。

IvyGAP项目在GBM中分析了五个解剖区域:前缘(LE),是肿瘤的最外层边界,具有极为罕见的神经胶质瘤细胞;浸润性肿瘤(IT),LE和核心之间的中间区域,包含10-20%的肿瘤细胞;细胞肿瘤(CT)核心,几乎没有非肿瘤细胞;坏死周围的伪苍白细胞(PAN),神经胶质瘤细胞在坏死区域周围聚集;和微血管增生(MVP)。作者使用ANOVA分析比较了五个解剖位置确定的“细胞状态”基因的表达。重要的是,一组八个常用基因(ACTB,B2M,GAPDH,GUSB,PPIA,RPLP0,TBP)没有显示出与任何特征的显着关联。此外,MVP(由血管组成的肿瘤的一种非恶性特征)中的细胞状态标记表达对G1 / S和G2 / M增殖特征强阳性,但与这四个恶性特征呈中性或负相关。相反,恶性细胞状态特征基因都预测一个或多个解剖区域。

LE和IT共同构成了肿瘤与正常大脑之间的主要侵入性界面或边界。 IT丰富了神经(NPC)和少突胶质祖细胞(OPC)以及星形细胞分化(AC)的特征。相比之下,该特征的增生特征是中性的或非常弱的,表明这些肿瘤区域包含较少的循环细胞。最后,考虑到IT和LE区域的细胞减少,我们不能排除非肿瘤微环境元素对上述特征相关性的潜在贡献。PAN是主要的解剖学特征,包含缺氧依赖性的MES2信号,而G1 / S和G2 / M信号为阴性则表明坏死周围的增殖较慢。相比之下,GBM核心中的CT强烈增强了增殖信号,代表了迅速分裂的神经胶质瘤。此外,此功能显示出很强的MES1和MES2负签名,突出了MES基因签名对肿瘤缺氧区域的特异性。

结果:使用ANOVA来确定哪个特征基因最能预测细胞状态和解剖位置。通过设置五个解剖特征之间的十个可能比较中的八个的阈值,对于确定高度可预测的基因很重要。该分析确定TAGLN3,APOD GFAP和ANXA1分别是NPC,OPC,AC和MES状态的最佳预测指标。测试这些基因作为特定细胞状态和地址的潜在报告基因,可能被证明是在临床前研究中研究细胞可塑性的强大新工具。

原文链接:

Eberhart, C.G., Bar, E.E. Spatial enrichment of cellular states in glioblastomaActa Neuropathol 140, 85–87 (2020). https://doi.org/10.1007/s00401-020-02165-3

 

 

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    2021-05-25 windight
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    2021-05-07 yb6560
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    2020-07-22 清晰

    0

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    2020-07-21 lovetcm

    #胶质母细胞瘤#重新进行分子分型

    0

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