A PIK3C3-ankyrin-B-dynactin pathway promotes axonal growth and multiorganelle transport.

A PIK3C3-ankyrin-B-dynactin pathway promotes axonal growth and multiorganelle transport.
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DOI:
10.1083/jcb.201407063
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发表时间:
2014-12-22
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Bennett V
Bennett V
中科院分区:
其他
文献类型:
--
作者:
Lorenzo DN;Badea A;Davis J;Hostettler J;He J;Zhong G;Zhuang X;Bennett V

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锚蛋白b与动力蛋白和磷脂酰肌醇3-磷酸脂质的相互作用促进细胞器的快速轴突运输。轴突的生长需要细胞器的远距离运输,但是这些货物如何招募它们的马达以及它们的运输如何被调节还没有完全解决。在本文中,我们发现了一种基于III类pi3激酶(PIK3C3)、锚蛋白- b (AnkB)和动力蛋白的新途径,可促进突触囊泡、线粒体、核内体和溶酶体的快速轴突运输。我们发现dynactin通过AnkB与dynactin亚基p62和PIK3C3产生的磷脂酰肌醇3-磷酸(PtdIns(3)P)脂质的相互作用与货物结合。AnkB敲除导致轴突束缩短,dynactin和dynein的膜关联明显减少,而3D-STORM成像的spectrin-actin轴突环的组织不受影响。AnkB或其与p62或PtdIns(3)P连接的缺失或PIK3C3的缺失都会损害海马神经元的细胞器运输,尤其是逆行运输。我们的研究结果在PIK3C3、dynactin和AnkB之间建立了新的功能关系,它们共同促进细胞器的轴突运输,并且是正常轴突长度所必需的。
Interactions between ankyrin-B and both dynactin and phosphatidylinositol 3-phosphate lipids promote fast axonal transport of organelles. Axon growth requires long-range transport of organelles, but how these cargoes recruit their motors and how their traffic is regulated are not fully resolved. In this paper, we identify a new pathway based on the class III PI3-kinase (PIK3C3), ankyrin-B (AnkB), and dynactin, which promotes fast axonal transport of synaptic vesicles, mitochondria, endosomes, and lysosomes. We show that dynactin associates with cargo through AnkB interactions with both the dynactin subunit p62 and phosphatidylinositol 3-phosphate (PtdIns(3)P) lipids generated by PIK3C3. AnkB knockout resulted in shortened axon tracts and marked reduction in membrane association of dynactin and dynein, whereas it did not affect the organization of spectrin–actin axonal rings imaged by 3D-STORM. Loss of AnkB or of its linkages to either p62 or PtdIns(3)P or loss of PIK3C3 all impaired organelle transport and particularly retrograde transport in hippocampal neurons. Our results establish new functional relationships between PIK3C3, dynactin, and AnkB that together promote axonal transport of organelles and are required for normal axon length.
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