FLT3 activation cooperates with MLL-AF4 fusion protein to abrogate the hematopoietic specification of human ESCs.

Abstract:

:Mixed-lineage leukemia (MLL)-AF4 fusion arises prenatally in high-risk infant acute pro-B-lymphoblastic leukemia (pro-B-ALL). In human embryonic stem cells (hESCs), MLL-AF4 skewed hematoendothelial specification but was insufficient for transformation, suggesting that additional oncogenic insults seem required for MLL-AF4-mediated transformation. MLL-AF4+ pro-B-ALL expresses enormous levels of FLT3, occasionally because of activating mutations, thus representing a candidate cooperating event in MLL-AF4+ pro-B-ALL. Here, we explored the developmental impact of FLT3 activation alone, or together with MLL-AF4, in the hematopoietic fate of hESCs. FLT3 activation does not affect specification of hemogenic precursors but significantly enhances the formation of CD45(+) blood cells, and CD45(+)CD34(+) blood progenitors with clonogenic potential. However, overexpression of FLT3 mutations or wild-type FLT3 (FLT3-WT) completely abrogates hematopoietic differentiation from MLL-AF4-expressing hESCs, indicating that FLT3 activation cooperates with MLL-AF4 to inhibit human embryonic hematopoiesis. Cell cycle/apoptosis analyses suggest that FLT3 activation directly affects hESC specification rather than proliferation or survival of hESC-emerging hematopoietic derivatives. Transcriptional profiling of hESC-derived CD45(+) cells supports the FLT3-mediated inhibition of hematopoiesis in MLL-AF4-expressing hESCs, which is associated with large transcriptional changes and downregulation of genes involved in hematopoietic system development and function. Importantly, FLT3 activation does not cooperate with MLL-AF4 to immortalize/transform hESC-derived hematopoietic cells, suggesting the need of alternative (epi)-genetic cooperating hits.

journal_name

Blood

journal_title

Blood

authors

Bueno C,Ayllón V,Montes R,Navarro-Montero O,Ramos-Mejia V,Real PJ,Romero-Moya D,Araúzo-Bravo MJ,Menendez P

doi

10.1182/blood-2012-11-470146

subject

Has Abstract

pub_date

2013-05-09 00:00:00

pages

3867-78, S1-3

issue

19

eissn

0006-4971

issn

1528-0020

pii

blood-2012-11-470146

journal_volume

121

pub_type

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