Defective microtubule-dependent podosome organization in osteoclasts leads to increased bone density in Pyk2(-/-) mice.

Defective microtubule-dependent podosome organization in osteoclasts leads to increased bone density in Pyk2(-/-) mice.
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DOI:
10.1083/jcb.200701148
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发表时间:
2007-09-10
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Schlessinger J
Schlessinger J
中科院分区:
其他
文献类型:
--
作者:
Gil-Henn H;Destaing O;Sims NA;Aoki K;Alles N;Neff L;Sanjay A;Bruzzaniti A;De Camilli P;Baron R;Schlessinger J

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蛋白酪氨酸激酶 Pyk2 在破骨细胞中高度表达,主要位于足体中。小鼠中 Pyk2 的缺失会因破骨细胞功能受损而导致轻度骨硬化症。 Pyk2缺失的破骨细胞无法将足小体簇转化为细胞外围的足小体带;仅形成小肌动蛋白环而不是密封区,导致骨吸收受损。此外,在 Pyk2 缺失的破骨细胞中,Rho 活性增强,而微管乙酰化和稳定性显着降低。通过在 Pyk2−/− 小鼠的破骨细胞中异位表达野生型或各种 Pyk2 突变体进行的拯救实验表明,Pyk2 的 FAT 结构域对于足小体带和密封区的形成以及骨吸收至关重要。这些实验强调了 Pyk2 在微管依赖性足体组织、骨吸收和其他破骨细胞功能中的重要作用。
The protein tyrosine kinase Pyk2 is highly expressed in osteoclasts, where it is primarily localized in podosomes. Deletion of Pyk2 in mice leads to mild osteopetrosis due to impairment in osteoclast function. Pyk2-null osteoclasts were unable to transform podosome clusters into a podosome belt at the cell periphery; instead of a sealing zone only small actin rings were formed, resulting in impaired bone resorption. Furthermore, in Pyk2-null osteoclasts, Rho activity was enhanced while microtubule acetylation and stability were significantly reduced. Rescue experiments by ectopic expression of wild-type or a variety of Pyk2 mutants in osteoclasts from Pyk2−/− mice have shown that the FAT domain of Pyk2 is essential for podosome belt and sealing zone formation as well as for bone resorption. These experiments underscore an important role of Pyk2 in microtubule-dependent podosome organization, bone resorption, and other osteoclast functions.
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