TET2 Loss Dysregulates the Behavior of Bone Marrow Mesenchymal Stromal Cells and Accelerates Tet2(-/-)-Driven Myeloid Malignancy Progression.

TET2 Loss Dysregulates the Behavior of Bone Marrow Mesenchymal Stromal Cells and Accelerates Tet2(-/-)-Driven Myeloid Malignancy Progression.
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TET2 丢失会失调骨髓间充质基质细胞的行为并加速 Tet2(-/-) 驱动的骨髓恶性肿瘤进展。

DOI:
10.1016/j.stemcr.2017.11.019
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发表时间:
2018-01-09
期刊:
影响因子:
5.9
通讯作者:
Zhao Z
Zhao Z
中科院分区:
医学1区
文献类型:
--
作者:
Li R;Zhou Y;Cao Z;Liu L;Wang J;Chen Z;Xing W;Chen S;Bai J;Yuan W;Cheng T;Xu M;Yang FC;Zhao Z

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TET2 是一种甲基胞嘧啶双加氧酶,可调节胞嘧啶羟甲基化。尽管有大量数据表明 TET2 在造血干/祖细胞 (HSPC) 中发挥关键作用,但 TET2 在骨髓间充质基质细胞 (BMSC) 中的重要性仍不清楚。在这项研究中,我们发现 BMSC 中 TET2 的缺失会增加细胞增殖和自我更新,并增强 BMSC 的成骨细胞分化潜力,这可能反过来改变它们支持 HSPC 增殖和分化的行为。此外,Tet2 缺失会改变 BMSC 促进 Tet2 缺陷介导的骨髓恶性肿瘤进展。 BMSC 中 Tet2 的缺失也会导致 5-甲基胞嘧啶 (5mC) 的羟基化以及对 BMSC 增殖和成骨细胞分化至关重要的基因表达失调,从而导致体内生物学特性的改变。这些结果强调了 TET2 在维持 BMSC 功能和成骨细胞分化中的关键作用,并提供了 BMSC 中表观遗传修饰因子的失调导致骨髓恶性肿瘤进展的证据。 BMSC 中的 TET2 缺失会增加细胞增殖和成骨细胞分化 BMSC 中的 TET2 缺失会增加 BMSC 的造血支持能力 BMSC 中的 TET2 缺失会加速 Tet2 缺陷介导的骨髓恶性肿瘤。在这篇文章中,Zhao 及其同事证明,TET2 除了在 HSPC 中参与异常造血的内在作用之外,还在调节 BMSC 的行为中发挥着重要作用。此外,他们还表明,BMSC 是 Tet2−/− 小鼠中最重要的利基细胞成分,有助于 Tet2 缺失驱动的骨髓恶性肿瘤的进展。
TET2 is a methylcytosine dioxygenase that regulates cytosine hydroxymethylation. Although there are extensive data implicating a pivotal role of TET2 in hematopoietic stem/progenitor cells (HSPCs), the importance of TET2 in bone marrow mesenchymal stromal cells (BMSCs) remains unknown. In this study, we show that loss of TET2 in BMSCs increases cell proliferation and self-renewal and enhances osteoblast differentiation potential of BMSCs, which may in turn alter their behavior in supporting HSPC proliferation and differentiation. In addition, Tet2 loss alters BMSCs in promoting Tet2-deficiency-mediated myeloid malignancy progression. Tet2 loss in BMSCs also dysregulates hydroxylation of 5-methylcytosine (5mC) and the expression of genes that are key for BMSC proliferation and osteoblast differentiation, leading to alteration of biological characteristics in vivo. These results highlight the critical role of TET2 in the maintenance of BMSC functions and osteoblast differentiation and provide evidence that dysregulation of epigenetic modifiers in BMSCs contributes to the progression of myeloid malignancies. TET2 loss in BMSCs increases cell proliferation and osteoblast differentiation TET2 loss in BMSCs increases hematopoietic supportive capacity of BMSCs TET2 loss in BMSCs accelerates Tet2-deficiency-mediated myeloid malignancy In this article, Zhao and colleagues demonstrated that TET2 plays an important role in regulating the behavior of BMSCs in addition to its intrinsic role in HSPCs to participate in aberrant hematopoiesis. Moreover, they also show that BMSCs are the most important niche cell components in Tet2−/− mice that contribute to the progression of Tet2-deletion-driven myeloid malignancies.
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