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4
7 Integrin Defines a Distinct Pathway of Lymphoid Progenitors Committed to T Cells, Fetal Intestinal Lymphotoxin Producer, NK, and Dendritic Cells1




*
Department of Molecular Genetics, Graduate School of Medicine, and
Department of Immunology, Institute for Frontier Medical Sciences, Kyoto University, Sakyo, Kyoto, Japan; and
Division of Molecular Immunology, La Jolla Institute for Allergy and Immunology, San Diego, CA 92121
During embryogenesis, the Peyers patch anlagen are induced by a
cell population that produces lymphotoxin (LT)
1
2 following stimulation of IL-7R
. In
this study, we show that the LT-producing cell is localized within the
IL-7R
+ and integrin
4
7
(
4
7)+ population in the
embryonic intestine. Lineage commitment to the LT producer phenotype in
the fetal liver coincides with expression of
4
7. Before expression of
4
7, the potential of
IL-7R
+ population to generate B cells is lost. However,
the progenitors for T cells and LT producer cells reside in the
IL-7R
+
4
7+
cells, but during subsequent differentiation, the potential to give
rise to T cells is lost. This
IL-7R
+
4
7+
population migrates to the intestine, where it induces the Peyers
patch anlagen. When stimulated with IL-15 or IL-3 and TNF, the
intestinal
IL-7R
+
4
7+
population can differentiate into fully competent
NK1.1+ NK cells or CD11c+ APCs. Expression of
4
7 is lost during differentiation of both
lineages; IL-7R
expression is lost during NK1.1+ cells
differentiation. A newly discovered
lineage-IL-7R
+c-Kit+
4
7+
population in the fetal liver is committed to T, NK, dendritic,
and fetal intestinal LT producer lineage, the latter being an
intermediate stage during differentiation of NK and dendritic
cells.
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