Department of Molecular Genetics and Microbiology, University of New Mexico School of Medicine, Albuquerque, NM 87131, USA.
FEBS Lett. 2010 Apr 2;584(7):1313-8. doi: 10.1016/j.febslet.2010.02.054. Epub 2010 Feb 24.
Autophagy initiation is strictly dependent on phosphatidylinositol 3-phosphate (PI3P) synthesis. PI3P production is under tight control of PI3Kinase, hVps34, in complex with Beclin-1. Mammalian cells express several PI3P phosphatases that belong to the myotubularin family. Even though some of them have been linked to serious human diseases, their cellular function is largely unknown. Two recent studies indicate that PI3P metabolism involved in autophagy initiation is further regulated by the PI3P phosphatases Jumpy and MTMR3. Additional pools of PI3P, upstream of mTOR and on the endocytic pathway, may modulate autophagy indirectly, suggesting that other PI3P phosphatases might be involved in this process. This review sums up our knowledge on PI3P phosphatases and discusses the recent progress on their role in autophagy.
自噬的起始严格依赖于磷脂酰肌醇 3-磷酸(PI3P)的合成。PI3P 的产生受到 PI3 激酶、与 Beclin-1 形成复合物的 hVps34 的严格控制。哺乳动物细胞表达几种属于肌管素家族的 PI3P 磷酸酶。尽管其中一些已与严重的人类疾病相关联,但它们的细胞功能在很大程度上仍是未知的。最近的两项研究表明,参与自噬起始的 PI3P 代谢进一步受到 PI3P 磷酸酶 Jumpy 和 MTMR3 的调节。mTOR 上游和内吞途径上的其他 PI3P 池可能间接调节自噬,这表明其他 PI3P 磷酸酶可能参与这一过程。本文综述了我们对 PI3P 磷酸酶的了解,并讨论了它们在自噬中的作用的最新进展。