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首页> 外文期刊>Journal of Cellular Physiology >Altered bone development and turnover in transgenic mice over-expressing Lipocalin-2 in bone
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Altered bone development and turnover in transgenic mice over-expressing Lipocalin-2 in bone

机译:改变骨骼发育和营业额转基因小鼠过度表达Lipocalin-2骨

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摘要

Lipocalin-2 (LCN2) is a protein largely expressed in many tissues, associated with different biological phenomena such as cellular differentiation, inflammation and cancer acting as a survival/apoptotic signal. We found that LCN2 was expressed during osteoblast differentiation and we generated transgenic (Tg) mice over-expressing LCN2 in bone. Tg mice were smaller and presented bone microarchitectural changes in both endochondral and intramembranous bones. In particular, Tg bones displayed a thinner layer of cortical bone and a decreased trabecular number. Osteoblast bone matrix deposition was reduced and osteoblast differentiation was slowed-down. Differences were also observed in the growth plate of young transgenic mice where chondrocyte displayed a more immature phenotype and a lower proliferation rate. In bone marrow cell cultures from transgenic mice, the number of osteoclast progenitors was increased whereas in vivo it was increased the number of mature osteoclasts expressing tartrate-resistant acid phosphatase (TRAP). Finally, while osteoprotegerin (OPG) levels remained unchanged, the expression of the conventional receptor activator of nuclear factor-κB ligand (RANKL) and of the IL-6 was enhanced in Tg mice. In conclusion, we found that LCN2 plays a role in bone development and turnover having both a negative effect on bone formation, by affecting growth plate development and interfering with osteoblast differentiation, and a positive effect on bone resorption by enhancing osteoclast compartment.
机译:Lipocalin-2 (LCN2)很大程度上是一种蛋白质表达在许多组织中,与不同细胞等生物现象分化、炎症和癌症的表演作为一个生存/凋亡信号。LCN2在成骨细胞表达分化,我们生成转基因(Tg)老鼠过度表达LCN2骨头。小,骨头microarchitectural在软骨内和膜内的变化骨头。薄层皮质骨和减少小梁的号码。沉积减少,成骨细胞分化是热爱音乐。也观察到生长板的年轻转基因小鼠软骨细胞表现出的地方更多的不成熟的表型和较低的扩散率。转基因小鼠,破骨细胞的数量祖细胞而增加体内成熟破骨细胞的数量增加表达tartrate-resistant酸性磷酸酶(陷阱)。水平保持不变,的表达传统的核受体激活因子-κB配体(RANKL)和il - 6的增强在Tg老鼠。LCN2在骨骼发育过程中发挥作用营业额有负面影响在骨头的形成,影响生长板的发展和干扰成骨细胞分化,对骨吸收的和积极的影响提高破骨细胞室。

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