Phosphoinositide 3-kinase δ regulates membrane fission of Golgi carriers for selective cytokine secretion.

Phosphoinositide 3-kinase δ regulates membrane fission of Golgi carriers for selective cytokine secretion.
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磷酸肌醇3-激酶δ调节高尔基体载体的膜裂变,以进行选择性细胞因子分泌。

DOI:
10.1083/jcb.201001028
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发表时间:
2010-09-20
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Stow JL
Stow JL
中科院分区:
其他
文献类型:
--
作者:
Low PC;Misaki R;Schroder K;Stanley AC;Sweet MJ;Teasdale RD;Vanhaesebroeck B;Meunier FA;Taguchi T;Stow JL

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PI3K亚型p110δ是肿瘤坏死因子运输和分泌所必需的。磷脂酰肌醇3-激酶(PI3K)p110亚型是经典的参与信号转导的膜脂蛋白激酶。脂多糖激活的巨噬细胞大量分泌包括肿瘤坏死因子-α在内的致炎细胞因子。在小鼠中,使用抑制剂、δ介导的敲除或遗传失活使PI3K的p110核糖核酸亚型失去功能,取消肿瘤坏死因子的运输和分泌,将肿瘤坏死因子捕获在跨高尔基网络的管状载体中。在脂多糖激活的巨噬细胞中,激活的p110δ定位于高尔基复合体,肿瘤坏死因子被装载到P230标记的小管中,当p110δ失活时,小管不能发生分裂。这些发现表明,p110δ作为巨噬细胞选择性运输和分泌细胞因子所需的膜分裂机制的一部分,具有新的功能。
The PI3K isoform p110δ is required for TNF trafficking and secretion. Phosphoinositide 3-kinase (PI3K) p110 isoforms are membrane lipid kinases classically involved in signal transduction. Lipopolysaccharide (LPS)-activated macrophages constitutively and abundantly secrete proinflammatory cytokines including tumor necrosis factor-α (TNF). Loss of function of the p110δ isoform of PI3K using inhibitors, RNA-mediated knockdown, or genetic inactivation in mice abolishes TNF trafficking and secretion, trapping TNF in tubular carriers at the trans-Golgi network (TGN). Kinase-active p110δ localizes to the Golgi complex in LPS-activated macrophages, and TNF is loaded into p230-labeled tubules, which cannot undergo fission when p110δ is inactivated. Similar blocks in fission of these tubules and in TNF secretion result from inhibition of the guanosine triphosphatase dynamin 2. These findings demonstrate a new function for p110δ as part of the membrane fission machinery required at the TGN for the selective trafficking and secretion of cytokines in macrophages.
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