TBL1XR1突變驅動結外淋巴瘤
作者:
小柯機器人發布時間:2020/7/4 17:13:36
美國康奈爾大學Ari M. Melnick研究團隊取得最新進展。他們發現TBL1XR1突變通過誘導腫瘤發生前記憶命運驅動結外淋巴瘤。該研究於2020年7月2日發表於《細胞》。
他們顯示TBL1XR1突變使體液免疫反應傾向於產生異常的未成熟記憶B細胞(MB),同時損害漿細胞分化。在分子水平上,TBL1XR1突變體共同選擇SMRT / HDAC3抑制複合物,以結合MB細胞轉錄因子(TF)BACH2,並以生發中心(GC)TF BCL6為代價,導致前記憶轉錄重編程和細胞命運偏好。抗原回收後,TBL1XR1突變型MB細胞無法分化為漿細胞,而是優先重新進入新的GC反應,從而為循環再進入淋巴瘤發生機制提供了證據。
最終,TBL1XR1的改變會導致驚人的結外免疫母細胞淋巴瘤表型,類似人類疾病。人淋巴瘤和鼠淋巴瘤均具有擴大的MB樣細胞群體,與MB細胞起源一致,並描繪了免疫系統惡性轉化的不可預見途徑。
據了解,最具侵略性的B細胞淋巴瘤經常表現出結外分布,並在特徵較差的基因TBL1XR1中攜帶體細胞突變。
附:英文原文
Title: TBL1XR1 Mutations Drive Extranodal Lymphoma by Inducing a Pro-tumorigenic Memory Fate
Author: Leandro Venturutti, Matt Teater, Andrew Zhai, Amy Chadburn, Leena Babiker, Daleum Kim, Wendy Béguelin, Tak C. Lee, Youngjun Kim, Christopher R. Chin, William T. Yewdell, Brian Raught, Jude M. Phillip, Yanwen Jiang, Louis M. Staudt, Michael R. Green, Jayanta Chaudhuri, Olivier Elemento, Pedro Farinha, Andrew P. Weng, Michael D. Nissen, Christian Steidl, Ryan D. Morin, David W. Scott, Gilbert G. Privé, Ari M. Melnick
Issue&Volume: 2020-07-02
Abstract: The most aggressive B cell lymphomas frequently manifest extranodal distribution and carry somatic mutations in the poorly characterized gene TBL1XR1. Here, we show that TBL1XR1 mutations skew the humoral immune response toward generating abnormal immature memory B cells (MB), while impairing plasma cell differentiation. At the molecular level, TBL1XR1 mutants co-opt SMRT/HDAC3 repressor complexes toward binding the MB cell transcription factor (TF) BACH2 at the expense of the germinal center (GC) TF BCL6, leading to pre-memory transcriptional reprogramming and cell-fate bias. Upon antigen recall, TBL1XR1 mutant MB cells fail to differentiate into plasma cells and instead preferentially reenter new GC reactions, providing evidence for a cyclic reentry lymphomagenesis mechanism. Ultimately, TBL1XR1 alterations lead to a striking extranodal immunoblastic lymphoma phenotype that mimics the human disease. Both human and murine lymphomas feature expanded MB-like cell populations, consistent with a MB-cell origin and delineating an unforeseen pathway for malignant transformation of the immune system.
DOI: 10.1016/j.cell.2020.05.049
Source: https://www.cell.com/cell/fulltext/S0092-8674(20)30682-6
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