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re:懒得再翻,翻了怕是也太专业,没人看,就简...
懒得再翻,翻了怕是也太专业,没人看,就简单平白地讲一下这个文章的摘要吧。
Hyperconnectivity of neuronal circuits due to increased synaptic protein synthesis is thought to cause autism spectrum disorders (ASDs). The mammalian target of rapamycin (mTOR) is strongly implicated in ASDs by means of upstream signalling; however, downstream regulatory mechanisms are ill-defined. Here we show that knockout of the eukaryotic translation initiation factor 4E-binding protein 2 (4E-BP2)—an eIF4E repressor downstream of mTOR—or eIF4E overexpression leads to increased translation of neuroligins, which are postsynaptic proteins that are causally linked to ASDs. Mice that have the gene encoding 4E-BP2 (Eif4ebp2) knocked out exhibit an increased ratio of excitatory to inhibitory synaptic inputs and autistic-like behaviours (that is, social interaction deficits, altered communication and repetitive/stereotyped behaviours). Pharmacological inhibition of eIF4E activity or normalization of neuroligin 1, but not neuroligin 2, protein levels restores the normal excitation/inhibition ratio and rectifies the social behaviour deficits. Thus, translational control by eIF4E regulates the synthesis of neuroligins, maintaining the excitation-to-inhibition balance, and its dysregulation engenders ASD-like phenotypes.
名为4E-BP2的翻译调控蛋白,是掌管突触蛋白neuroligin的合成启动的众多蛋白中的一个,缺了4E-BP2,neuroligin的合成就会失控、过量,可导致ASD的神经回路上的过度通讯。把小鼠4E-BP2编码基因敲除,那小鼠neuroligin过量表达、突触信号失衡、行为上表现出ASD症状。然后,再对这种ASD小鼠,人为地转基因、控制好neuroligin或者控制好它抑制因子,使它翻译水平回复正常,就能让突触信号恢复平衡,小鼠的ASD症状消失。
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