IGF binding protein 2 is a cell-autonomous factor supporting survival and migration of acute leukemia cells

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• 作者：Xiaoli Chen (1)
  Junke Zheng (1)
  Yizhou Zou (1) (2)
  Chun Song (3)
  Xuemei Hu (4)
  Cheng Cheng Zhang (1)
  
• 刊名：Journal of Hematology & Oncology
• 出版年：2013
• 出版时间：December 2013
• 年：2013
• 卷：6
• 期：1
• 全文大小：1,777 KB
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• 作者单位：Xiaoli Chen (1)
  Junke Zheng (1)
  Yizhou Zou (1) (2)
  Chun Song (3)
  Xuemei Hu (4)
  Cheng Cheng Zhang (1)
  
  1. Departments of Physiology and Developmental Biology, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, 75390, TX, USA
  2. Department of Immunology, Central South University School of Xiangya Medicine, Changsha, China
  3. Shandong University and National New Drug R&D Center in Shandong, Jinan, China
  4. Department of Immunology, Binzhou Medical University, Yantai, China
  
• ISSN：1756-8722

文摘

Background The role of IGF binding protein 2 (IGFBP2) in cancer development is intriguing. Previously we identified IGFBP2 as an extrinsic factor that supports the activity of hematopoietic stem cells (HSCs). Methods and results Here we investigated the role of IGFBP2 in in human leukemia cells and in the retroviral AML1-ETO9a transplantation acute myeloid leukemia (AML) mouse model. Results IGFBP2 is highly expressed in certain human AML and acute lymphoblastic leukemia (ALL) cells. Inhibition of expression of endogenous IGFBP2 in human leukemia cells led to elevated apoptosis and decreased migration and, consistently, to decreased activation of AKT and other signaling molecules. We also studied the effects of IGFBP2 knockout in the retroviral AML1-ETO9a transplantation AML mouse model. The deletion of IGFBP2 in donor AML cells significantly decreased leukemia development in transplanted mice. Lack of IGFBP2 resulted in upregulation of PTEN expression and downregulation of AKT activation, in the mouse AML cells. The treatment of IGFBP2 deficient AML cells with a PTEN inhibitor restored the wild-type colony forming ability. The deletion of IGFBP2 also led to decreased AML infiltration into peripheral organs and tissues, suggesting that IGFBP2 is required for the migration of AML cells out of bone marrow. Conclusion IGFBP2 is a critical cell-autonomous factor that promotes the survival and migration of acute leukemia cells.