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:
影响因子:
--
通讯作者:
Niedergang F
中科院分区:
文献类型:
--
作者:
Lewkowicz E;Herit F;Le Clainche C;Bourdoncle P;Perez F;Niedergang F
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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