β-catenin activity in late hypertrophic chondrocytes locally orchestrates osteoblastogenesis and osteoclastogenesis.

β-catenin activity in late hypertrophic chondrocytes locally orchestrates osteoblastogenesis and osteoclastogenesis.
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DOI:
10.1242/dev.137489
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发表时间:
2016-10-15
期刊:
Development (Cambridge, England)
影响因子:
--
通讯作者:
Hartmann C
Hartmann C
中科院分区:
其他
文献类型:
--
作者:
Houben A;Kostanova-Poliakova D;Weissenböck M;Graf J;Teufel S;von der Mark K;Hartmann C

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松质骨形成是软骨内骨化的最后一步。这种软骨向骨的重塑过程涉及血管侵入和通过破软骨细胞和破骨细胞去除肥大软骨细胞(HTC)。骨膜和软骨细胞来源的骨祖细胞利用剩余的矿化HTC基质作为主要海绵形成的支架。在这里,我们从遗传学上表明,β-catenin(由Ctnnb 1编码)是经典Wnt通路的关键组成部分,在多个水平上协调了这一重塑过程。通过改变HTC中的Rankl:Opg比率,Col 10a 1-Cre系对HTC中β-连环蛋白的条件性失活或稳定局部调节破骨细胞生成。β-连环蛋白的缺乏导致胚胎长骨中骨小梁的严重减少。β-连环蛋白活性的增加干扰了晚期HTC的去除和骨髓形成,导致胚胎中连续的矿化肥大核心,并导致成年小鼠中的骨硬化样表型。此外,在软骨-骨连接处,软骨细胞衍生的成骨细胞生成需要晚期HTC中的β-连环蛋白活性。后者导致HTC中缺乏β-连环蛋白活性的突变体中严重的骨小梁表型。总结:晚期肥大软骨细胞中β-连环蛋白活性的条件性调节局部调节破骨细胞分化和软骨细胞向成骨细胞的转分化。
Trabecular bone formation is the last step in endochondral ossification. This remodeling process of cartilage into bone involves blood vessel invasion and removal of hypertrophic chondrocytes (HTCs) by chondroclasts and osteoclasts. Periosteal- and chondrocyte-derived osteoprogenitors utilize the leftover mineralized HTC matrix as a scaffold for primary spongiosa formation. Here, we show genetically that β-catenin (encoded by Ctnnb1), a key component of the canonical Wnt pathway, orchestrates this remodeling process at multiple levels. Conditional inactivation or stabilization of β-catenin in HTCs by a Col10a1-Cre line locally modulated osteoclastogenesis by altering the Rankl:Opg ratio in HTCs. Lack of β-catenin resulted in a severe decrease of trabecular bone in the embryonic long bones. Gain of β-catenin activity interfered with removal of late HTCs and bone marrow formation, leading to a continuous mineralized hypertrophic core in the embryo and resulting in an osteopetrotic-like phenotype in adult mice. Furthermore, β-catenin activity in late HTCs is required for chondrocyte-derived osteoblastogenesis at the chondro-osseous junction. The latter contributes to the severe trabecular bone phenotype in mutants lacking β-catenin activity in HTCs. Summary: The conditional modulation of β-catenin activity in late hypertrophic chondrocytes locally regulates osteoclast differentiation and the transdifferentiation of chondrocytes into osteoblasts.
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