Osteoblast precursors, but not mature osteoblasts, move into developing and fractured bones along with invading blood vessels.
Dev Cell
; 19(2): 329-44, 2010 Aug 17.
Article
em En
| MEDLINE
| ID: mdl-20708594
ABSTRACT
During endochondral bone development, the first osteoblasts differentiate in the perichondrium surrounding avascular cartilaginous rudiments; the source of trabecular osteoblasts inside the later bone is, however, unknown. Here, we generated tamoxifen-inducible transgenic mice bred to Rosa26R-LacZ reporter mice to follow the fates of stage-selective subsets of osteoblast lineage cells. Pulse-chase studies showed that osterix-expressing osteoblast precursors, labeled in the perichondrium prior to vascular invasion of the cartilage, give rise to trabecular osteoblasts, osteocytes, and stromal cells inside the developing bone. Throughout the translocation, some precursors were found to intimately associate with invading blood vessels, in pericyte-like fashion. A similar coinvasion occurs during endochondral healing of bone fractures. In contrast, perichondrial mature osteoblasts did not exhibit perivascular localization and remained in the outer cortex of developing bones. These findings reveal the specific involvement of immature osteoblast precursors in the coupled vascular and osteogenic transformation essential to endochondral bone development and repair.
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Base de dados:
MEDLINE
Assunto principal:
Osteoblastos
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Células-Tronco
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Vasos Sanguíneos
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Desenvolvimento Ósseo
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Regeneração Óssea
Idioma:
En
Ano de publicação:
2010
Tipo de documento:
Article