A pair of inhibitory neurons are required to sustain labile memory in the Drosophila mushroom body.

A pair of inhibitory neurons are required to sustain labile memory in the Drosophila mushroom body.
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DOI:
10.1016/j.cub.2011.03.069
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发表时间:
2011-05-24
期刊:
影响因子:
9.2
通讯作者:
Waddell, Scott
Waddell, Scott
中科院分区:
生物学1区
文献类型:
--
作者:
Pitman, Jena L.;Huetteroth, Wolf;Burke, Christopher J.;Krashes, Michael J.;Lai, Sen-Lin;Lee, Tzumin;Waddell, Scott

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不稳定的记忆被认为是大脑中持续的神经网络活动。然而,目前还不知道生物相关的存储电路是如何组织和操作的。果蝇的不稳定和持久的食欲记忆需要训练后来自α‘β的蘑菇体(MB)神经元子集和一对调制背侧配对内侧(DPM)神经元的输出。DPM神经元支配整个MB叶区域,似乎是MB的突触前和突触后,与递归网络模型一致。在这里,我们确定了训练后GABA能前配对外侧(APL)神经元的突触输出的作用。在训练后阻断APL神经元的突触输出会扰乱不稳定的记忆,但不会影响长期记忆。α‘β区神经元与DPM神经元的接触最为密集,但它们的突起是相互交织的,在所有的脑叶都相互接触。此外,APL与α叶的MB神经元接触,但与α叶远端的MB神经元几乎没有直接接触。我们认为,APL神经元提供广泛的抑制,以稳定和维持反复的DPM和MBα‘β’神经元回路中不稳定记忆痕迹的突触特异性。
Labile memory is thought to be held in the brain as persistent neural network activity. However, it is not known how biologically relevant memory circuits are organized and operate. Labile and persistent appetitive memory in Drosophila requires output after training from the α′β′ subset of mushroom body (MB) neurons and from a pair of modulatory Dorsal Paired Medial (DPM) neurons. DPM neurons innervate the entire MB lobe region and appear to be pre- and post-synaptic to the MB, consistent with a recurrent network model. Here we identify a role after training for synaptic output from the GABAergic Anterior Paired Lateral (APL) neurons. Blocking synaptic output from APL neurons after training disrupts labile memory but does not affect long-term memory. APL neurons contact DPM neurons most densely in the α′β′ lobes although their processes are intertwined and contact throughout all the lobes. Furthermore, APL contacts MB neurons in the α′ lobe but makes little direct contact with those in the distal α lobe. We propose that APL neurons provide widespread inhibition to stabilize and maintain synaptic specificity of a labile memory trace in a recurrent DPM and MB α′β′ neuron circuit.
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