單細胞測序鑑定到髓母細胞瘤的前體細胞
作者:
小柯機器人發布時間:2019/8/30 14:03:50
美國辛辛那提兒童醫院醫療中心Q. Richard Lu和Xuelian He等研究人員合作利用髓母細胞瘤單細胞轉錄組學,發現腫瘤發生與復發時起始的前體細胞以及致癌級聯信號。該項研究成果2019年8月29日在線發表在《癌細胞》上。
利用單細胞轉錄組學分析,研究人員證明了SHH(Sonic Hedgehog)髓母細胞瘤中前體細胞群的發育層次,並且鑑定了表達OLIG2的神經膠質前體細胞在腫瘤發生時作為轉移-擴增細胞。儘管OLIG2陽性前體細胞在完整的腫瘤中成為靜止的幹細胞樣細胞,但它們在治療抗性和復發性髓母細胞瘤中高度富集。去除分裂的Olig2陽性前體細胞或Olig2的敲除能夠阻礙腫瘤的發生。基因組分析顯示OLIG2調節染色質形貌並激活致癌網絡,包括HIPPO-YAP /TAZ和AURORA-A/MYCN途徑。共同靶向這些致癌途徑能夠導致腫瘤生長停滯。總之,這些結果表明膠質細胞譜系相關的OLIG2 陽性前體細胞是髓母細胞瘤發生和復發期間的腫瘤起始細胞,並表明OLIG2驅動的致癌網絡是潛在的治療靶標。
據悉,在髓母細胞瘤中腫瘤起始和復發的前體細胞異質性和身份仍然是難以捉摸的。
附:英文原文
Title: Single-Cell Transcriptomics in Medulloblastoma Reveals Tumor-Initiating Progenitors and Oncogenic Cascades during Tumorigenesis and Relapse
Author: Liguo Zhang, Xuelian He, Xuezhao Liu, Feng Zhang, L. Frank Huang, Andrew S. Potter, Lingli Xu, Wenhao Zhou, Tao Zheng, Zaili Luo, Kalen P. Berry, Allison Pribnow, Stephanie M. Smith, Christine Fuller, Blaise V. Jones, Maryam Fouladi, Rachid Drissi, Zeng-Jie Yang, W. Clay Gustafson, Marc Remke, Scott L. Pomeroy, Emily J. Girard, James M. Olson, A. Sorana Morrissy, Maria C. Vladoiu, Jiao Zhang, Weidong Tian, Mei Xin, Michael D. Taylor, S. Steven Potter, Martine F. Roussel, William A. Weiss, Q. Richard Lu
Issue&Volume: 29 August 2019
Abstract: Progenitor heterogeneity and identities underlying tumor initiation and relapse in medulloblastomas remain elusive. Utilizing single-cell transcriptomic analysis, we demonstrated a developmental hierarchy of progenitor pools in Sonic Hedgehog (SHH) medulloblastomas, and identified OLIG2-expressing glial progenitors as transit-amplifying cells at the tumorigenic onset. Although OLIG2 + progenitors become quiescent stem-like cells in full-blown tumors, they are highly enriched in therapy-resistant and recurrent medulloblastomas. Depletion of mitotic Olig2 + progenitors or Olig2 ablation impeded tumor initiation. Genomic profiling revealed that OLIG2 modulates chromatin landscapes and activates oncogenic networks including HIPPO-YAP/TAZ and AURORA-A/MYCN pathways. Co-targeting these oncogenic pathways induced tumor growth arrest. Together, our results indicate that glial lineage-associated OLIG2 + progenitors are tumor-initiating cells during medulloblastoma tumorigenesis and relapse, suggesting OLIG2-driven oncogenic networks as potential therapeutic targets.
DOI: https://doi.org/10.1016/j.ccell.2019.07.009
Source: https://www.cell.com/cancer-cell/fulltext/S1535-6108(19)30336-8#