Lynx1, a cholinergic brake, limits plasticity in adult visual cortex.

Lynx1, a cholinergic brake, limits plasticity in adult visual cortex.
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DOI:
10.1126/science.1195320
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发表时间:
2010-11-26
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Hensch TK
Hensch TK
中科院分区:
其他
文献类型:
--
作者:
Morishita H;Miwa JM;Heintz N;Hensch TK

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经验依赖的大脑可塑性通常会在电路建立的早期关键时期后下降。随着关键时期的结束,可塑性的丧失限制了成年期功能的改善,但改变大脑可塑性的机制仍然知之甚少。在这里,我们发现Lynx1蛋白在小鼠中的表达增加,阻止了初级视觉皮层在生命后期的可塑性。去除这个分子制动器增强了烟碱乙酰胆碱受体的信号传导。因此,在胆碱能神经支配下,Lynx1的表达维持了成熟皮质网络的稳定性。结果表明,调节兴奋和抑制回路之间的平衡可以重新激活视觉可塑性,这可能是一个治疗目标。
Experience-dependent brain plasticity typically declines after an early critical period during which circuits are established. Loss of plasticity with closure of the critical period limits improvement of function in adulthood, but the mechanisms that change the brain’s plasticity remain poorly understood. Here, we identified an increase in expression of Lynx1 protein in mice that prevented plasticity in the primary visual cortex late in life. Removal of this molecular brake enhanced nicotinic acetylcholine receptor signaling. Lynx1 expression thus maintains stability of mature cortical networks in the presence of cholinergic innervation. The results suggest that modulating the balance between excitatory and inhibitory circuits reactivates visual plasticity and may present a therapeutic target.
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