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Blood, 15 June 2007, Vol. 109, No. 12, pp. 5208-5214.
Prepublished online as a Blood First Edition Paper on February 27, 2007; DOI 10.1182/blood-2007-01-069005.
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HEMATOPOIESIS
Migratory path of definitive hematopoietic stem/progenitor cells during zebrafish development
Hao Jin1,2,
Jin Xu1,2, and
Zilong Wen1,2
1 Laboratory of Molecular & Developmental Immunology, Institute of Molecular and Cell Biology, Proteos; and
the 2 Department of Biological Sciences, the National University of Singapore, Singapore.
The development of vertebrate definitive hematopoiesis is featured by temporally and spatially dynamic distribution of hematopoietic stem/progenitor cells (HSPCs). It is proposed that the migration of definitive HSPCs, at least in part, accounts for this unique characteristic; however, compelling in vivo lineage evidence is still lacking. Here we present an in vivo analysis to delineate the migration route of definitive HSPCs in the early zebrafish embryo. Cell-marking analysis was able to first map definitive HSPCs to the ventral wall of dorsal aorta (DA). These cells were subsequently found to migrate to a previously unappreciated organ, posterior blood island (PBI), located between the caudal artery and caudal vein, and finally populate the kidney, the adult hematopoietic organ. These findings demonstrate that the PBI acts as an intermediate hematopoietic organ in a manner analogous to the mammalian fetal liver to sustain definitive hematopoiesis before adult kidney hematopoiesis occurs. Thus our study unambiguously documents the in vivo trafficking of definitive HSPCs among developmentally successive hematopoietic compartments and underscores the ontogenic conservation of definitive hematopoiesis between zebrafish and mammals.
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