Response properties of the electrosensory neurons in hindbrain of the white sturgeon,Acipenser transmontanus  

高首鲟背听侧核电感受神经元在电场刺激下的反应特性(英文)

作　　者：张旭光[1] Hendrik Herzog 宋佳坤[1] 王晓杰[1] 范纯新[1] 郭弘艺[1] 

机构地区：[1]上海海洋大学海洋生物系统与神经科学研究所,上海201306 [2]波恩大学动物研究所

出　　处：《Neuroscience Bulletin》2011年第6期422-429,共8页神经科学通报（英文版）

基　　金：supported by the National Natural Science Foundation of China(30970365);the Science and Technology Commission of Shanghai Municipality of China(073205109);Hydrobiology funding(S30701);a grant from the Excellent Graduate Students Theses Cultivation Program of Shanghai Municipality,China

摘　　要：Objective The passive electrosense is a primitive sensory modality in the Chondrostei, which include sturgeon and paddlefish. Using electroreceptors, these fish detect the weak electric fields from other animals or geoelectric sources, and use this information for prey detection or other behaviors. The primary afferent fibers innervating the electroreceptors project to a single hindbrain target called the dorsal octavolateral nucleus （DON）, where the electrosensory information is first processed. Here, we investigated the electrophysiological properties of DON neurons. Methods Extracellular recording was used to investigate the response properties of DON neurons to dipole electric fields with different amplitudes and frequencies in the white sturgeon, Acipenser transmontanus. Results The DON neurons showed regular spontaneous activity and could be classified into two types： neurons with a low spontaneous rate （〈10 Hz） and those with a high spon- taneous rate （〉10 Hz）. In response to sinusoidal electric field stimuli, DON neurons showed sinusoidally-modulated and phase-locked firing. In addition, neurons showed opposite phase responses corresponding to the different directions of the dipole. Conclusion The response properties of DON neurons match the electrosensory biological function in sturgeon, as they match the characteristics of the electric fields of its prey.目的软骨硬鳞鱼类的电感受是一种古老的感觉系统,它们通过电感受器官感受生物电场或非生物电场进行摄食等活动。支配电感受器的初级传入神经首先将电感受信息传递至后脑的背听侧核进行处理。本文探讨了鲟鱼背听侧核的电生理特性。方法采用胞外记录方法记录了高首鲟背听侧核在偶极子电场刺激下的神经元反应。结果背听侧核神经元有低频(<10Hz)自发放电和高频(>10Hz)自发放电两种,在电场刺激下均产生明显的自发放电的调制和相位耦合反应,同时部分神经元对偶极子电场的方向有选择性。结论鲟鱼的电感受神经元反应特征与其电感受的生物功能相适应。

关 键 词：electrosense STURGEON DIPOLE single unit HINDBRAIN 

分 类 号：Q42[生物学—神经生物学]