Divergent midbrain circuits orchestrate escape and freezing responses to looming stimuli in mice.

Divergent midbrain circuits orchestrate escape and freezing responses to looming stimuli in mice.
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不同的中脑回路协调小鼠对迫在眉睫的刺激的逃避和冻结反应

DOI:
10.1038/s41467-018-03580-7
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发表时间:
2018-03-26
影响因子:
16.6
通讯作者:
Cao P
Cao P
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Shang C;Chen Z;Liu A;Li Y;Zhang J;Qu B;Yan F;Zhang Y;Liu W;Liu Z;Guo X;Li D;Wang Y;Cao P

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动物对环境威胁的反应,如隐约可见的视觉刺激,用先天的防御行为,如逃跑和冻结。参与这种二态防御行为产生的关键神经回路仍不清楚。在这里,我们证明了由隐约可见的视觉刺激触发的二态行为模式是由小鼠上丘(SC)中的小白蛋白阳性(PV+)投射神经元介导的。两组不同的SC PV+神经元形成不同的通路,将与威胁相关的视觉信号传递到双侧臂旁核(PBGN)和丘脑后外侧核(LPTN)中的神经元。PV+SC-PBGN和SC-LPTN通路的激活模拟了这种二态防御行为。PBGN和LPTN神经元被隐约可见的视觉刺激共同激活。其中一个核团的双侧失活导致由另一个核团主导的防御行为。综上所述,这些数据表明,SC通过两条可能存在相互作用的单独的技术分离途径来协调二态防御行为。
Animals respond to environmental threats, e.g. looming visual stimuli, with innate defensive behaviors such as escape and freezing. The key neural circuits that participate in the generation of such dimorphic defensive behaviors remain unclear. Here we show that the dimorphic behavioral patterns triggered by looming visual stimuli are mediated by parvalbumin-positive (PV+) projection neurons in mouse superior colliculus (SC). Two distinct groups of SC PV+neurons form divergent pathways to transmit threat-relevant visual signals to neurons in the parabigeminal nucleus (PBGN) and lateral posterior thalamic nucleus (LPTN). Activations of PV+SC-PBGN and SC-LPTN pathways mimic the dimorphic defensive behaviors. The PBGN and LPTN neurons are co-activated by looming visual stimuli. Bilateral inactivation of either nucleus results in the defensive behavior dominated by the other nucleus. Together, these data suggest that the SC orchestrates dimorphic defensive behaviors through two separate tectofugal pathways that may have interactions.
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