mTOR的奥秘:关于雷帕霉素作用机制靶点在神经退行性变中的细微差别与问题
mTOR Mysteries: Nuances and Questions About the Mechanistic Target of Rapamycin in Neurodegeneration.
作者信息
Norwitz Nicholas G, Querfurth Henry
机构信息
Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford, United Kingdom.
Department of Neurology, Tufts Medical Center, Boston, MA, United States.
出版信息
Front Neurosci. 2020 Jul 29;14:775. doi: 10.3389/fnins.2020.00775. eCollection 2020.
The mechanistic target of rapamycin protein complex, mTORC1, has received attention in recent years for its role in aging and neurodegenerative diseases, such as Alzheimer's disease. Numerous excellent reviews have been written on the pathways and drug targeting of this keystone regulator of metabolism. However, none have specifically highlighted several important nuances of mTOR regulation as relates to neurodegeneration. Herein, we focus on six such nuances/open questions: (1) "Antagonistic pleiotropy" - Should we weigh the beneficial anabolic functions of mTORC1 against its harmful inhibition of autophagy? (2) "Early/late-stage specificity" - Does the relative importance of these neuroprotective/neurotoxic actions change as a disease progresses? (3) "Regional specificity" - Does mTOR signaling respond differently to the same interventions in different brain regions? (4) "Disease specificity" - Could the same intervention to inhibit mTORC1 help in one disease and cause harm in another disease? (5) "Personalized therapy" - Might genetically-informed personalized therapies that inhibit particular nodes in the mTORC1 regulatory network be more effective than generalized therapies? (6) "Lifestyle interventions" - Could specific diets, micronutrients, or exercise alter mTORC1 signaling to prevent or improve the progression neurodegenerative diseases? This manuscript is devoted to discussing recent research findings that offer insights into these gaps in the literature, with the aim of inspiring further inquiry.
近年来,雷帕霉素蛋白复合物的机制性靶点mTORC1因其在衰老和神经退行性疾病(如阿尔茨海默病)中的作用而受到关注。关于这一新陈代谢关键调节因子的信号通路和药物靶点,已经有众多优秀的综述文章发表。然而,尚无文章专门强调mTOR调节与神经退行性变相关的几个重要细微差别。在此,我们聚焦于六个这样的细微差别/开放性问题:(1)“拮抗性多效性”——我们是否应该权衡mTORC1有益的合成代谢功能与其对自噬的有害抑制作用?(2)“早期/晚期特异性”——随着疾病进展,这些神经保护/神经毒性作用的相对重要性是否会发生变化?(3)“区域特异性”——mTOR信号在不同脑区对相同干预的反应是否不同?(4)“疾病特异性”——抑制mTORC1的相同干预措施在一种疾病中可能有益,而在另一种疾病中可能有害吗?(5)“个性化治疗”——基于基因信息的、抑制mTORC1调节网络中特定节点的个性化治疗是否比通用治疗更有效?(6)“生活方式干预”——特定的饮食、微量营养素或运动能否改变mTORC1信号,以预防或改善神经退行性疾病的进展?本文致力于讨论近期的研究发现,这些发现为文献中的这些空白提供了见解,旨在激发进一步的探究。