Live imaging of Runx1 expression in the dorsal aorta tracks the emergence of blood progenitors from endothelial cells.

Abstract:

:Blood cells of an adult vertebrate are continuously generated by hematopoietic stem cells (HSCs) that originate during embryonic life within the aorta-gonad-mesonephros region. There is now compelling in vivo evidence that HSCs are generated from aortic endothelial cells and that this process is critically regulated by the transcription factor Runx1. By time-lapse microscopy of Runx1-enhanced green fluorescent protein transgenic zebrafish embryos, we were able to capture a subset of cells within the ventral endothelium of the dorsal aorta, as they acquire hemogenic properties and directly emerge as presumptive HSCs. These nascent hematopoietic cells assume a rounded morphology, transiently occupy the subaortic space, and eventually enter the circulation via the caudal vein. Cell tracing showed that these cells subsequently populated the sites of definitive hematopoiesis (thymus and kidney), consistent with an HSC identity. HSC numbers depended on activity of the transcription factor Runx1, on blood flow, and on proper development of the dorsal aorta (features in common with mammals). This study captures the earliest events of the transition of endothelial cells to a hemogenic endothelium and demonstrates that embryonic hematopoietic progenitors directly differentiate from endothelial cells within a living organism.

journal_name

Blood

journal_title

Blood

authors

Lam EY,Hall CJ,Crosier PS,Crosier KE,Flores MV

doi

10.1182/blood-2010-01-264382

subject

Has Abstract

pub_date

2010-08-12 00:00:00

pages

909-14

issue

6

eissn

0006-4971

issn

1528-0020

pii

blood-2010-01-264382

journal_volume

116

pub_type

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