Osteoblast precursors, but not mature osteoblasts, move into developing and fractured bones along with invading blood vessels.

Osteoblast precursors, but not mature osteoblasts, move into developing and fractured bones along with invading blood vessels.
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DOI:
10.1016/j.devcel.2010.07.010
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发表时间:
2010-08-17
期刊:
影响因子:
11.8
通讯作者:
Kronenberg, Henry M.
Kronenberg, Henry M.
中科院分区:
生物学1区
文献类型:
--
作者:
Maes, Christa;Kobayashi, Tatsuya;Selig, Martin K.;Torrekens, Sophie;Roth, Sanford I.;Mackem, Susan;Carmeliet, Geert;Kronenberg, Henry M.

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在软骨内骨发育过程中,第一批成骨细胞在无血管软骨残骸周围的软骨膜中分化;然而,后期骨内的小梁成骨细胞的来源尚不清楚。在这里,我们产生了他莫昔芬诱导的转基因小鼠,培育成Rosa26R-LacZ报告小鼠,以跟踪成骨细胞系细胞阶段选择性亚群的命运。PULSE-CHASE研究表明,在血管侵入软骨之前,表达成骨细胞的成骨细胞前体在软骨膜中标记,在发育中的骨中产生成骨小梁细胞、骨细胞和基质细胞。在整个易位过程中,一些前体被发现以周细胞样的方式与入侵的血管密切相关。类似的共同侵袭也发生在骨折的软骨内愈合过程中。相反,软骨膜成熟的成骨细胞没有表现出血管周围的定位,而是留在发育中的骨骼的外层皮质。这些发现揭示了未成熟的成骨细胞前体特定地参与了软骨内骨发育和修复所必需的血管和成骨转化。
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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