Convergence of alpha(v)beta(3) integrin- and macrophage colony stimulating factor-mediated signals on phospholipase Cgamma in prefusion osteoclasts.

Convergence of alpha(v)beta(3) integrin- and macrophage colony stimulating factor-mediated signals on phospholipase Cgamma in prefusion osteoclasts.
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DOI:
10.1083/jcb.152.2.361
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发表时间:
2001-01-22
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Le T Duong
Le T Duong
中科院分区:
其他
文献类型:
--
作者:
Nakamura I;Lipfert L;Rodan GA;Le T Duong

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巨噬细胞集落刺激因子 (M-CSF) 和 αvβ3 整合素在破骨细胞功能中发挥着关键作用。本研究检测了来自 Src 缺陷型和野生型小鼠的融合前破骨细胞 (pOC) 中的 M-CSF 和粘附诱导的信号传导。 Src 缺陷细胞附着在玻连蛋白 (Vn) 包被的表面上,但不会在其上扩散,与野生型细胞相反,它们的粘附不会导致粘附激活的分子(包括 PYK2、p130Cas、桩蛋白和 PLC-γ)酪氨酸磷酸化。然而,响应 M-CSF,Src−/− pOC 以 αvβ3 依赖性方式在 Vn 上扩散和迁移。使用 PLC 抑制剂 U73122 来参与 PLC-γ 激活,该抑制剂可阻止粘附和 M-CSF 介导的细胞扩散。此外,在Src−/− pOCs中,M-CSF与丝状肌动蛋白一起,导致β3整合素和PLC-γ募集到粘附接触,并诱导β3整合素与PLC-γ、磷脂酰肌醇3-激酶和PYK2的稳定结合。此外,PYK2 和 PLC-γ 的直接相互作用可以通过粘附或 M-CSF 诱导,表明这种相互作用可能能够形成整合素相关复合物。此外,这项研究表明,在 pOC 中,PLC-γ 是粘附和生长因子信号的常见下游介质。在没有 c-Src 的情况下,M-CSF 启动的信号传导可能通过 PLC-γ 调节预融合破骨细胞中 αvβ3 整合素介导的细胞骨架重组。
The macrophage colony stimulating factor (M-CSF) and αvβ3 integrins play critical roles in osteoclast function. This study examines M-CSF– and adhesion-induced signaling in prefusion osteoclasts (pOCs) derived from Src-deficient and wild-type mice. Src-deficient cells attach to but do not spread on vitronectin (Vn)-coated surfaces and, contrary to wild-type cells, their adhesion does not lead to tyrosine phosphorylation of molecules activated by adhesion, including PYK2, p130Cas, paxillin, and PLC-γ. However, in response to M-CSF, Src−/− pOCs spread and migrate on Vn in an αvβ3-dependent manner. Involvement of PLC-γ activation is suggested by using a PLC inhibitor, U73122, which blocks both adhesion- and M-CSF–mediated cell spreading. Furthermore, in Src−/− pOCs M-CSF, together with filamentous actin, causes recruitment of β3 integrin and PLC-γ to adhesion contacts and induces stable association of β3 integrin with PLC-γ, phosphatidylinositol 3-kinase, and PYK2. Moreover, direct interaction of PYK2 and PLC-γ can be induced by either adhesion or M-CSF, suggesting that this interaction may enable the formation of integrin-associated complexes. Furthermore, this study suggests that in pOCs PLC-γ is a common downstream mediator for adhesion and growth factor signals. M-CSF–initiated signaling modulates the αvβ3 integrin-mediated cytoskeletal reorganization in prefusion osteoclasts in the absence of c-Src, possibly via PLC-γ.
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