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Roles of the pretectum in prey capture of zebrafish larvae

Roles of the pretectum in prey capture of zebrafish larvae

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中国神经科学学会第九届全国学术会议暨第五次会员代表大会

作者： Bai-Bing ZHANG,Xiao-Quan LI,Yu MU,Shu-Yi ZHANG,Yu-Juan SU,Jiu-Lin DU~* Laboratory of Sensory Integration & Behavior,Institute of Neuroscience,Shanghai Institutes of Biological Sciences, Chinese Academy of Sciences,Shanghai 200031,China

＜正＞Objective The pretectum,a region between the thalamus and midbrain,receives binocular sensory inputs from retinal ganglion cells（RGCs）and sends output to the optic *** studies in amphibians suggest important roles of the pretectum in prey capture *** larvae develop the ability to capture prey as early as 5 days post-fertilization（dpf）.Zebrafish pretectum mainly consists of three types of neurons,including dopaminergic, serotoninergic and GABAergic cells,implying its modulatory roles in prey *** present study,we examined how the pretectum regulates prey capture at both neural circuit and behavior *** The morphology of pretectal dopaminergic neurons was revealed by using the transgenic line ETvmat2:GFP,in which monoaminergic neurons express GFP,and Kaede-based photo-conversion in vivo ***,defects in the Paramecium capture behavior of zebrafish larvae with laser ablation of pretectal dopaminergic neurons were ***,in vivo calcium imaging of both tectal and pretectal neurons was carried on to study their response evoked by prey-like cues. Finally,the detection of dopamine release by carbon fiber and pharmacological manipulation of dopamine signaling were used to examine the role of dopaminergic neurons in modulation of optic tectal *** We found that there was a dopaminergic neuron cluster in the pretectum that projected to the deep layer of the tectal neuropil. Focal ablation of these neurons impaired Paramecium capture *** data showed that some sparsely distributed tectal neurons responded to prey-like visual *** experiments will be performed to figure out how pretectal dopaminergic neurons modulate prey-like cue-induced responses in tectal *** The pretectum regulates prey capture behavior through dopaminergic neuromodulation of tectal function.

关键词： zebrafish pretecum optic tectum prey capture dopaminergic neuron in vivo imaging

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