Osteo-chondroprogenitor cells are derived from Sox9 expressing precursors
Sox9
is also expressed in other tissues, including central nervous system, neural crest, intestine, pancreas, testis, and endocardial cushions, and plays a crucial role in cell proliferation and differentiation in several of these tissues. To determine the cell fate of
Sox9
-expressing cells during mouse embryogenesis, we generated mice in which a Cre recombinase gene preceded by an internal ribosome entry site was inserted into the 3′ untranslated region of the
Sox9
gene (
Sox9-Cre
knock-in). In the developing skeleton,
Sox9
was expressed before
Runx2
, an early osteoblast marker gene. Cell fate mapping by using
Sox9-Cre;ROSA26
reporter (
R26R
) mice revealed that
Sox9
-expressing limb bud mesenchymal cells gave rise to both chondrocytes and osteoblasts. Furthermore, a mutant in which the
Osterix
gene was inactivated in
Sox9
-expressing cells exhibited a lack of endochondral and intramembranous ossification and a lack of mature osteoblasts comparable with
Osterix
-null mutants. In addition,
Sox9
-expressing limb bud mesenchymal cells also contributed to tendon and synovium formation. By using
Sox9-Cre
;
R26R
mice, we also were able to systematically follow
Sox9
-expressing cells from embryonic day 8.0 to 17.0. Our results showed that
Sox9
-expressing cells contributed to the formation of all cell types of the spinal cord, epithelium of the intestine, pancreas, and mesenchyme of the testis. Thus, our results strongly suggest that all osteo-chondroprogenitor cells, as well as progenitors in a variety of tissues, are derived from Sox9-expressing precursors during mouse embryogenesis.
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- Published
- Oct 03, 2005
- Vol/Issue
- 102(41)
- Pages
- 14665-14670
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