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Journal of Hematology & Oncology

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Open Access 01-12-2011 | Research

Enhanced self-renewal of hematopoietic stem/progenitor cells mediated by the stem cell gene Sall4

Authors: Jianchang Yang, Jerell R Aguila, Zaida Alipio, Raymond Lai, Louis M Fink, Yupo Ma

Published in: Journal of Hematology & Oncology | Issue 1/2011

Abstract

Background

Sall4 is a key factor for the maintenance of pluripotency and self-renewal of embryonic stem cells (ESCs). Our previous studies have shown that Sall4 is a robust stimulator for human hematopoietic stem and progenitor cell (HSC/HPC) expansion. The purpose of the current study is to further evaluate how Sall4 may affect HSC/HPC activities in a murine system.

Methods

Lentiviral vectors expressing Sall4A or Sall4B isoform were used to transduce mouse bone marrow Lin-/Sca1+/c-Kit+ (LSK) cells and HSC/HPC self-renewal and differentiation were evaluated.

Results

Forced expression of Sall4 isoforms led to sustained ex vivo proliferation of LSK cells. In addition, Sall4 expanded HSC/HPCs exhibited increased in vivo repopulating abilities after bone marrow transplantation. These activities were associated with dramatic upregulation of multiple HSC/HPC regulatory genes including HoxB4, Notch1, Bmi1, Runx1, Meis1 and Nf-ya. Consistently, downregulation of endogenous Sall4 expression led to reduced LSK cell proliferation and accelerated cell differentiation. Moreover, in myeloid progenitor cells (32D), overexpression of Sall4 isoforms inhibited granulocytic differentiation and permitted expansion of undifferentiated cells with defined cytokines, consistent with the known functions of Sall4 in the ES cell system.

Conclusion

Sall4 is a potent regulator for HSC/HPC self-renewal, likely by increasing self-renewal activity and inhibiting differentiation. Our work provides further support that Sall4 manipulation may be a new model for expanding clinically transplantable stem cells.

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Title: Enhanced self-renewal of hematopoietic stem/progenitor cells mediated by the stem cell gene Sall4
Authors: Jianchang Yang
Jerell R Aguila
Zaida Alipio
Raymond Lai
Louis M Fink
Yupo Ma
Publication date: 01-12-2011
Publisher: BioMed Central
Published in: Journal of Hematology & Oncology / Issue 1/2011
Electronic ISSN: 1756-8722
DOI: https://doi.org/10.1186/1756-8722-4-38

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