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:
影响因子:
--
通讯作者:
Le T Duong
中科院分区:
文献类型:
--
作者:
Nakamura I;Lipfert L;Rodan GA;Le T Duong
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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