Fra-2/AP-1 controls bone formation by regulating osteoblast differentiation and collagen production.

Fra-2/AP-1 controls bone formation by regulating osteoblast differentiation and collagen production.
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DOI:
10.1083/jcb.201002111
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发表时间:
2010-09-20
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Wagner EF
Wagner EF
中科院分区:
其他
文献类型:
--
作者:
Bozec A;Bakiri L;Jimenez M;Schinke T;Amling M;Wagner EF

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成骨细胞特异性骨钙素基因和胶原蛋白1α2都是控制骨形成的转录因子Fra-2的靶点。激活蛋白-1(AP-1)转录因子复合物,特别是Fos蛋白,是骨稳态的重要调节剂。Fra-2(Fosl 2)是AP-1家族的Fos相关蛋白,在骨细胞中表达,缺乏Fra-2的新生小鼠表现出软骨细胞和破骨细胞的缺陷。在这里,我们表明,Fra-2缺陷的成骨细胞显示在体内和体外的分化缺陷。此外,Fra-2过表达的小鼠是成骨细胞,因为成骨细胞的分化增加,这似乎是细胞自主的。重要的是,成骨细胞特异性骨钙素(Oc)基因和胶原1 α2(col 1 α2)是小鼠和人骨细胞中Fra-2的转录靶点。此外,Fra-2、Oc和col 1在人成软骨细胞和成骨细胞性骨肉瘤(Os)的基质细胞中以及在人Os细胞系的成骨细胞分化期间表达。这些发现揭示了Fra-2/AP-1作为小鼠和人类骨和基质形成的正调节剂的新功能。
Both the osteoblast-specific osteocalcin gene and collagen 1α2 are targets of the transcription factor Fra-2, which controls bone formation. The activator protein-1 (AP-1) transcription factor complex, in particular the Fos proteins, is an important regulator of bone homeostasis. Fra-2 (Fosl2), a Fos-related protein of the AP-1 family, is expressed in bone cells, and newborn mice lacking Fra-2 exhibit defects in chondrocytes and osteoclasts. Here we show that Fra-2–deficient osteoblasts display a differentiation defect both in vivo and in vitro. Moreover, Fra-2–overexpressing mice are osteosclerotic because of increased differentiation of osteoblasts, which appears to be cell autonomous. Importantly, the osteoblast-specific osteocalcin (Oc) gene and collagen1α2 (col1α2) are transcriptional targets of Fra-2 in both murine and human bone cells. In addition, Fra-2, Oc, and col1 are expressed in stromal cells of human chondroblastic and osteoblastic osteosarcomas (Os’s) as well as during osteoblast differentiation of human Os cell lines. These findings reveal a novel function of Fra-2/AP-1 as a positive regulator of bone and matrix formation in mice and humans.
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