The microtubule-binding protein CLIP-170 coordinates mDia1 and actin reorganization during CR3-mediated phagocytosis.

The microtubule-binding protein CLIP-170 coordinates mDia1 and actin reorganization during CR3-mediated phagocytosis.
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DOI:
10.1083/jcb.200807023
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发表时间:
2008-12-29
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Niedergang F
Niedergang F
中科院分区:
其他
文献类型:
--
作者:
Lewkowicz E;Herit F;Le Clainche C;Bourdoncle P;Perez F;Niedergang F

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微管动力学由与其正末端结合的调节蛋白(+TIP [正末端跟踪蛋白])调节,如胞质连接蛋白170(CLIP-170)或末端结合蛋白1(EB 1)。我们研究了+TIPs在巨噬细胞吞噬过程中的作用。使用RNA干扰和显性负性方法,我们表明CLIP-170是由αMβ2整合素/补体受体激活触发的有效吞噬作用所必需的。对于EB 1和EB 3未观察到该性质。因此,尽管CLIP-170在吞噬作用位点动态富集,但EB 1不是。此外,我们观察到,CLIP-170控制招聘的肌动蛋白成核蛋白,在吞噬作用的开始,从而控制肌动蛋白聚合的事件是必不可少的吞噬作用。CLIP-170直接与mDia 1的同源性2结构域相互作用。CLIP-170和mDia 1之间的相互作用在αMβ2介导的吞噬作用中受到负调节。我们的研究结果揭示了一种新的微管/肌动蛋白合作,涉及CLIP-170和mDia 1,并在αMβ2整合素下游发挥作用。
Microtubule dynamics are modulated by regulatory proteins that bind to their plus ends (+TIPs [plus end tracking proteins]), such as cytoplasmic linker protein 170 (CLIP-170) or end-binding protein 1 (EB1). We investigated the role of +TIPs during phagocytosis in macrophages. Using RNA interference and dominant-negative approaches, we show that CLIP-170 is specifically required for efficient phagocytosis triggered by αMβ2 integrin/complement receptor activation. This property is not observed for EB1 and EB3. Accordingly, whereas CLIP-170 is dynamically enriched at the site of phagocytosis, EB1 is not. Furthermore, we observe that CLIP-170 controls the recruitment of the formin mDia1, an actin-nucleating protein, at the onset of phagocytosis and thereby controls actin polymerization events that are essential for phagocytosis. CLIP-170 directly interacts with the formin homology 2 domain of mDia1. The interaction between CLIP-170 and mDia1 is negatively regulated during αMβ2-mediated phagocytosis. Our results unravel a new microtubule/actin cooperation that involves CLIP-170 and mDia1 and that functions downstream of αMβ2 integrins.
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