The Journal of Experimental Medicine
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J. Exp. Med., Volume 190, Number 1, July 5, 1999 43-52
Copyright © 1999 by The Rockefeller University Press.

Stem Cell Emergence and Hemopoietic Activity Are Incompatible in Mouse Intraembryonic Sites

Isabelle Godina, Juan Antonio Garcia-Porrerob, Françoise Dieterlen-Lièvrea, and Ana Cumanoc
a From the Institut d'Embryologie Cellulaire et Moléculaire du Centre National de la Recherche Scientifique (CNRS) et du Collège de France, 94736 Nogent sur Marne Cedex, France
b Departamiento de Anatomia y Biologia Cellular, Facultad de Medicina, Universidad de Cantabria, Santander, Spain
c Unité de Biologie Moléculaire du Gène et Unité du Développement des Lymphocytes, Institut Pasteur, 75024 Paris Cedex 15, France

Correspondence to: Isabelle Godin

In the mouse embryo, the generation of candidate progenitors for long-lasting hemopoiesis has been reported in the paraaortic splanchnopleura (P-Sp)/aorta-gonad-mesonephros (AGM) region. Here, we address the following question: can the P-Sp/AGM environment support hemopoietic differentiation as well as generate stem cells, and, conversely, are other sites where hemopoietic differentiation occurs capable of generating stem cells? Although P-Sp/AGM generates de novo hemopoietic stem cells between 9.5 and 12.5 days post coitus (dpc), we show here that it does not support hemopoietic differentiation. Among mesoderm-derived sites, spleen and omentum were shown to be colonized by exogenous cells in the same fashion as the fetal liver. Cells colonizing the spleen were multipotent and pursued their evolution to committed progenitors in this organ. In contrast, the omentum, which was colonized by lymphoid-committed progenitors that did not expand, cannot be considered as a hemopoietic organ. From these data, stem cell generation appears incompatible with hemopoietic activity. At the peak of hemopoietic progenitor production in the P-Sp/AGM, between 10.5 and 11.5 dpc, multipotent cells were found at the exceptional frequency of 1 out of 12 total cells and 1 out of 4 AA4.1+ cells. Thus, progenitors within this region constitute a pool of undifferentiated hemopoietic cells readily accessible for characterization.

Key Words: aorta-gonad-mesonephros, spleen, omentum, hemopoiesis, reconstitution


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