I{kappa}B kinase (IKK){beta}, but not IKK{alpha}, is a critical mediator of osteoclast survival and is required for inflammation-induced bone loss.

I{kappa}B kinase (IKK){beta}, but not IKK{alpha}, is a critical mediator of osteoclast survival and is required for inflammation-induced bone loss.
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DOI:
10.1084/jem.20042081
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发表时间:
2005-05-16
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Karin M
Karin M
中科院分区:
其他
文献类型:
--
作者:
Ruocco MG;Maeda S;Park JM;Lawrence T;Hsu LC;Cao Y;Schett G;Wagner EF;Karin M

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转录因子核因子κB(NF-κB)是体内破骨细胞形成所必需的,缺乏NF-κB p50和p52蛋白的小鼠是骨硬化症。在此,我们讨论了介导NF-κB活化的IκB激酶(IKK)复合物的两个催化亚基IKKα和IKKβ在破骨细胞形成和炎症诱导的骨丢失中的相对作用。我们的研究结果指出IKKβ亚基作为NF-κ B受体激活因子(RANK)信号转导子的重要性。尽管IKKα在体外是RANK配体诱导破骨细胞形成所必需的,但在体内并不需要。然而,IKKβ是体外和体内破骨细胞生成所必需的。IKKβ还保护破骨细胞及其祖细胞免受肿瘤坏死因子α诱导的凋亡,其在造血细胞中的丢失可防止炎症诱导的骨丢失。
Transcription factor, nuclear factor κB (NF-κB), is required for osteoclast formation in vivo and mice lacking both of the NF-κB p50 and p52 proteins are osteopetrotic. Here we address the relative roles of the two catalytic subunits of the IκB kinase (IKK) complex that mediate NF-κB activation, IKKα and IKKβ, in osteoclast formation and inflammation-induced bone loss. Our findings point out the importance of the IKKβ subunit as a transducer of signals from receptor activator of NF-κB (RANK) to NF-κB. Although IKKα is required for RANK ligand-induced osteoclast formation in vitro, it is not needed in vivo. However, IKKβ is required for osteoclastogenesis in vitro and in vivo. IKKβ also protects osteoclasts and their progenitors from tumor necrosis factor α–induced apoptosis, and its loss in hematopoietic cells prevents inflammation-induced bone loss.
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