Abstract:
:Leukemogenesis requires two classes of mutations, one that promotes proliferation and one that blocks differentiation. The erythroleukemia induced by Friend virus is a multistage disease characterized by an early proliferative stage driven by the interaction of the viral glycoprotein, gp55, with Sf-Stk and the EpoR, and a late block to differentiation resulting from retroviral insertion in the Pu.1 locus. We demonstrate here that activation of Stat3 by Sf-Stk in the early stage of disease is essential for the progression of erythroleukemia in the presence of differentiation signals induced by the EpoR, but is dispensable in the late stages of the disease. Furthermore, we identify Pu.1 as a Stat3 target gene in the early stages of erythroleukemia development. Our results support a model whereby the activation of Stat3 in the early stage of disease plays a pivotal role in regulating differentiation through the upregulation of Pu.1, thus inhibiting differentiation and favoring the expansion of infected erythroblasts and enhancing the pool of progenitors available for the acquisition of additional mutations, including insertional activation of Pu.1, resulting in full leukemic transformation.
journal_name
Oncogenejournal_title
Oncogeneauthors
Hegde S,Ni S,He S,Yoon D,Feng GS,Watowich SS,Paulson RF,Hankey PAdoi
10.1038/onc.2009.202subject
Has Abstractpub_date
2009-09-24 00:00:00pages
3349-59issue
38eissn
0950-9232issn
1476-5594pii
onc2009202journal_volume
28pub_type
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