Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Schwann-Cell-Specific Deletion of Phosphatidylinositol 4-Kinase Alpha Causes Aberrant Myelination.
Cell Reports ( IF 7.5 ) Pub Date : 2018-Jun-05 , DOI: 10.1016/j.celrep.2018.05.019 Alejandro Alvarez-Prats 1 , Ivana Bjelobaba 2 , Zane Aldworth 3 , Takashi Baba 1 , Daniel Abebe 1 , Yeun Ju Kim 1 , Stanko S Stojilkovic 2 , Mark Stopfer 3 , Tamas Balla 1
Cell Reports ( IF 7.5 ) Pub Date : 2018-Jun-05 , DOI: 10.1016/j.celrep.2018.05.019 Alejandro Alvarez-Prats 1 , Ivana Bjelobaba 2 , Zane Aldworth 3 , Takashi Baba 1 , Daniel Abebe 1 , Yeun Ju Kim 1 , Stanko S Stojilkovic 2 , Mark Stopfer 3 , Tamas Balla 1
Affiliation
Active membrane remodeling during myelination relies on phospholipid synthesis and membrane polarization, both of which are known to depend on inositol phospholipids. Here, we show that sciatic nerves of mice lacking phosphatidylinositol 4-kinase alpha (PI4KA) in Schwann cells (SCs) show substantially reduced myelin thickness with grave consequences on nerve conductivity and motor functions. Surprisingly, prolonged inhibition of PI4KA in immortalized mouse SCs failed to decrease plasma membrane phosphatidylinositol 4,5-bisphosphate (PI(4,5)P2) levels or PI 3-kinase (PI3K) activation, in spite of large reductions in plasma membrane PI4P levels. Instead, it caused rearrangements of the actin cytoskeleton, which was also observed in sciatic nerves of knockout animals. PI4KA inactivation disproportionally reduced phosphatidylserine, phosphatidylethanolamine, and sphingomyelin content in mutant nerves, with similar changes observed in SCs treated with a PI4KA inhibitor. These studies define a role for PI4KA in myelin formation primarily affecting metabolism of key phospholipids and the actin cytoskeleton.
中文翻译:
雪旺细胞特异性缺失磷脂酰肌醇 4-激酶 Alpha 会导致髓鞘形成异常。
髓鞘形成过程中的主动膜重塑依赖于磷脂合成和膜极化,已知这两者都依赖于肌醇磷脂。在这里,我们发现施万细胞(SC)中缺乏磷脂酰肌醇4激酶α(PI4KA)的小鼠的坐骨神经表现出髓磷脂厚度大幅减少,对神经传导性和运动功能产生严重影响。令人惊讶的是,在永生化小鼠 SC 中长期抑制 PI4KA 未能降低质膜磷脂酰肌醇 4,5-二磷酸 (PI(4,5)P 2 ) 水平或 PI 3-激酶 (PI3K) 激活,尽管质膜大幅减少PI4P 水平。相反,它引起肌动蛋白细胞骨架的重新排列,这也在基因敲除动物的坐骨神经中观察到。 PI4KA 失活会不成比例地降低突变神经中磷脂酰丝氨酸、磷脂酰乙醇胺和鞘磷脂的含量,在用 PI4KA 抑制剂处理的 SC 中观察到类似的变化。这些研究明确了 PI4KA 在髓磷脂形成中的作用,主要影响关键磷脂和肌动蛋白细胞骨架的代谢。
更新日期:2018-06-08
中文翻译:
雪旺细胞特异性缺失磷脂酰肌醇 4-激酶 Alpha 会导致髓鞘形成异常。
髓鞘形成过程中的主动膜重塑依赖于磷脂合成和膜极化,已知这两者都依赖于肌醇磷脂。在这里,我们发现施万细胞(SC)中缺乏磷脂酰肌醇4激酶α(PI4KA)的小鼠的坐骨神经表现出髓磷脂厚度大幅减少,对神经传导性和运动功能产生严重影响。令人惊讶的是,在永生化小鼠 SC 中长期抑制 PI4KA 未能降低质膜磷脂酰肌醇 4,5-二磷酸 (PI(4,5)P 2 ) 水平或 PI 3-激酶 (PI3K) 激活,尽管质膜大幅减少PI4P 水平。相反,它引起肌动蛋白细胞骨架的重新排列,这也在基因敲除动物的坐骨神经中观察到。 PI4KA 失活会不成比例地降低突变神经中磷脂酰丝氨酸、磷脂酰乙醇胺和鞘磷脂的含量,在用 PI4KA 抑制剂处理的 SC 中观察到类似的变化。这些研究明确了 PI4KA 在髓磷脂形成中的作用,主要影响关键磷脂和肌动蛋白细胞骨架的代谢。