MSI2 mediates WNT/β-Catenin pathway function in hematopoietic stem cells

IF 12.8 1区 医学 Q1 HEMATOLOGY
Huifang Zhang, Ruixue Guo, Zhenfen Li, Rui Ma, Shina Xu, Le Yin, Hongkai Zhu, Zineng Huang, Cheng Xing, Yunlong Yang, Yulin Pu, Zhao Cheng, Jing Liu, Hongling Peng, Yue Sheng
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引用次数: 0

Abstract

First, we sorted out hematopoietic stem cells (HSCs) and hematopoietic stem and progenitor cells (HSPCs) from wildtype (WT) and Apc knockout (Apc KO, Apc−/−) mice, which are Apcfl/fl and Apcfl/flMx1Cre respectively. The Apc deletion was induced by Poly(I:C) injection. Quantitative PCR (qPCR) demonstrated a significant decrease of Msi2 expression in the HSCs (linc-Kit+ Sca1+CD150+CD48) and HSPCs (linc-Kit+) of Apc KO mice (Fig. 1B, C). To investigate the role of MSI2 in the WNT signaling pathway, MSI2 was re-expressed in Apc−/− HSPCs by retrovirus infection, and western blot (WB) confirmed Msi2 was successfully overexpressed (Supplementary Fig. 1). The colony-forming assay showed that restoring MSI2 expression could partially rescue the diminished colony-forming ability observed in Apc+/− and Apc−/− cells (Fig. 1D, E). Next, we collected colony cells from the above colony-forming assay, and found that restoration of MSI2 expression can significantly reduce the high apoptosis rate induced by Apc KO (Fig. 1F and Supplementary Fig. 2).

To further investigate the relationship between MSI2 and WNT signaling pathway, we performed in vivo transplantation experiments following the restoration of MSI2 expression in Apc KO cells. Five days after the 5-FU injection, HSPCs from WT (Apcfl/fl) or Apcfl/fl Mx1Cre mice were infected with MigR1 vector or MSI2, and then were transplanted into CD45.1 recipient mice irradiated lethally (10 Gray). One month later, pIpC was injected intra-peritoneally at bi-daily intervals to induce the expression of Mx1Cre to knock out Apc. Seven days after the third pIpC injection, the mice were euthanized, and bone marrow cells were gathered for detection (Fig. 1G). The restoration of MSI2 expression considerably increased the populations of HSCs (Linc-Kit+Sca1+CD48CD150+), LSK (Linc-Kit+Sca1+) and HPCs (Linc-Kit+Sca1) compared to cells from Apc KO mice (Fig. 1H and Supplementary Fig. 3). Furthermore, the proportion of granulocyte-monocyte progenitors (GMP) and common myeloid progenitors (CMP) in the HPC population returned to normal. The megakaryocyte-erythroid progenitors (MEP) also changed, but not significantly (Fig. 1I and Supplementary Fig. 4). Apc deletion can induce a significant increase in apoptosis, which is one of the main reasons for the decline of HSPCs [7]. We found that the restoration of MSI2 expression can significantly inhibit the increase of apoptosis caused by Apc deletion (Fig. 1J and Supplementary Fig. 5A, B), suggesting that MSI2 can partially rescue the decline of HSPCs induced by Apc loss through inhibiting apoptosis. In addition to HSPCs, we also analyzed the changes in mature cells and found that the restoration of MSI2 expression significantly increased myeloid cells in both bone marrow and spleen (Fig. 1K and Supplementary Fig. 6A, B). Conversely, B cells in bone marrow (Supplementary Fig. 7A, B) and T cells in the thymus (Supplementary Fig. 8A, B) showed no significant alterations.

Abstract Image

MSI2 在造血干细胞中介导 WNT/β-Catenin 通路功能
首先,我们从野生型(WT)小鼠和Apc基因敲除(Apc KO,Apc-/-)小鼠(分别为Apcfl/fl和Apcfl/flMx1Cre)中筛选出造血干细胞(HSCs)和造血干细胞及祖细胞(HSPCs)。Apc缺失是通过注射Poly(I:C)诱导的。定量 PCR(qPCR)显示,Apc KO 小鼠的造血干细胞(lin-c-Kit+ Sca1+CD150+CD48-)和 HSPCs(lin-c-Kit+)中 Msi2 的表达显著下降(图 1B, C)。为了研究MSI2在WNT信号通路中的作用,我们通过逆转录病毒感染在Apc-/- HSPCs中重新表达MSI2,Western blot(WB)证实Msi2被成功过表达(补充图1)。集落形成试验表明,恢复MSI2的表达可以部分挽救Apc+/-和Apc-/-细胞中观察到的减弱的集落形成能力(图1D,E)。为了进一步研究MSI2和WNT信号通路之间的关系,我们在Apc KO细胞中恢复MSI2表达后进行了体内移植实验。注射5-FU五天后,用MigR1载体或MSI2感染WT(Apcfl/fl)或Apcfl/fl Mx1Cre小鼠的HSPCs,然后移植到接受致死性照射(10 Gray)的CD45.1受体小鼠体内。一个月后,每隔两天腹腔注射一次 pIpC 以诱导 Mx1Cre 的表达,从而敲除 Apc。第三次注射 pIpC 七天后,小鼠安乐死,收集骨髓细胞进行检测(图 1G)。与 Apc KO 小鼠的细胞相比,MSI2 表达的恢复大大增加了造血干细胞(Lin-c-Kit+Sca1+CD48-CD150+)、LSK(Lin-c-Kit+Sca1+)和 HPC(Lin-c-Kit+Sca1-)的数量(图 1H 和补充图 3)。此外,HPC 群体中粒细胞-单核细胞祖细胞(GMP)和普通髓系祖细胞(CMP)的比例也恢复正常。巨核细胞-红细胞祖细胞(MEP)也发生了变化,但不明显(图 1I 和补充图 4)。Apc 缺失可诱导细胞凋亡显著增加,这是 HSPCs 减少的主要原因之一[7]。我们发现,恢复 MSI2 的表达可以显著抑制 Apc 缺失引起的细胞凋亡增加(图 1J 和补充图 5A,B),这表明 MSI2 可以通过抑制细胞凋亡部分挽救 Apc 缺失引起的 HSPCs 下降。除HSPCs外,我们还分析了成熟细胞的变化,发现恢复MSI2表达后,骨髓和脾脏中的髓样细胞均显著增加(图1K和补充图6A、B)。相反,骨髓中的 B 细胞(补充图 7A、B)和胸腺中的 T 细胞(补充图 8A、B)没有明显变化。
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来源期刊
Leukemia
Leukemia 医学-血液学
CiteScore
18.10
自引率
3.50%
发文量
270
审稿时长
3-6 weeks
期刊介绍: Title: Leukemia Journal Overview: Publishes high-quality, peer-reviewed research Covers all aspects of research and treatment of leukemia and allied diseases Includes studies of normal hemopoiesis due to comparative relevance Topics of Interest: Oncogenes Growth factors Stem cells Leukemia genomics Cell cycle Signal transduction Molecular targets for therapy And more Content Types: Original research articles Reviews Letters Correspondence Comments elaborating on significant advances and covering topical issues
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