A neural circuit mechanism integrating motivational state with memory expression in Drosophila.

A neural circuit mechanism integrating motivational state with memory expression in Drosophila.
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DOI:
10.1016/j.cell.2009.08.035
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发表时间:
2009-10-16
期刊:
影响因子:
64.5
通讯作者:
Waddell S
Waddell S
中科院分区:
生物学1区
文献类型:
--
作者:
Krashes MJ;DasGupta S;Vreede A;White B;Armstrong JD;Waddell S

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动机状态是行为的重要决定因素。在果蝇中,食欲记忆的表达受到饱腹感的限制,而受到饥饿的促进。在这里,我们确定了一种整合了饥饿和记忆的动机状态的神经机制。我们发现,刺激表达神经肽F(DNPF)的神经元(哺乳动物NPY的同源基因),可以模仿食物剥夺,并提高饱足果蝇的记忆能力。强健的食欲记忆能力需要六个多巴胺能神经元中的dNPF受体,这些神经元支配蘑菇体的不同区域。阻断这些多巴胺能神经元可以释放饱足果蝇的记忆表现,而刺激则抑制饥饿果蝇的记忆表现。因此,dNPF和多巴胺在蘑菇体内提供了一个激励开关,控制着食欲记忆的输出。
Motivational states are important determinants of behavior. In fruit flies appetitive memory expression is constrained by satiety and promoted by hunger. Here we identify a neural mechanism that integrates the motivational state of hunger and memory. We show that stimulation of neurons that express Neuropeptide F (dNPF), an ortholog of mammalian NPY, mimicks food-deprivation and promotes memory performance in satiated flies. Robust appetitive memory performance requires the dNPF receptor in six dopaminergic neurons that innervate a distinct region of the mushroom bodies. Blocking these dopaminergic neurons releases memory performance in satiated flies whereas stimulation suppresses memory performance in hungry flies. Therefore dNPF and dopamine provide a motivational switch in the mushroom body that controls the output of appetitive memory.
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