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首页> 外文期刊>Cell and Tissue Research >Encoding noxious heat by spike bursts of antennal bimodal hygroreceptor (dry) neurons in the carabid Pterostichus oblongopunctatus
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Encoding noxious heat by spike bursts of antennal bimodal hygroreceptor (dry) neurons in the carabid Pterostichus oblongopunctatus

机译：通过在Carabid Pterostichus oblongopopocopunctatus的偶然双模湿热体（干）神经元的尖峰爆发来编码有害热量

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摘要

Despite thermosensation being crucial in effective thermoregulation behaviour, it is poorly studied in insects. Very little is known about encoding of noxious high temperatures by peripheral thermoreceptor neurons. In carabids, thermo- and hygrosensitive neurons innervate antennal dome-shaped sensilla (DSS). In this study, we demonstrate that several essential fine structural features of dendritic outer segments of the sensory neurons in the DSS and the classical model of insect thermo- and hygrosensitive sensilla differ fundamentally. Here, we show that spike bursts produced by the bimodal dry neurons in the antennal DSS may contribute to the sensation of noxious heat in P. oblongopunctatus. Our electrophysiological experiments showed that, at temperatures above 25 A degrees C, these neurons switch from humidity-dependent regular spiking to temperature-dependent spike bursting. Five out of seven measured parameters of the bursty spike trains, the percentage of bursty dry neurons, the CV of ISIs in a spike train, the percentage of bursty spikes, the number of spikes in a burst and the ISIs in a burst, are unambiguously dependent on temperature and thus may precisely encode both noxious high steady temperatures up to 45 A degrees C as well as rapid step-changes in it. The cold neuron starts to produce temperature-dependent spike bursts at temperatures above 30-35 A degrees C. Thus, the two neurons encode different but largely overlapping ranges in noxious heat. The extent of dendritic branching and lamellation of the neurons largely varies in different DSS, which might be the structural basis for their variation in threshold temperatures for spike bursting.
机译：尽管热疏动在有效的热调节行为中至关重要，但它在昆虫中尚未研究。众所周知，关于通过外周热感受器神经元编码有害高温的编码。在Carabids中，热和杂质溶解神经元分配抗体圆顶Sensilla（DSS）。在这项研究中，我们证明DSS中的感觉神经元的树突外部区段的几种基本细节结构特征和昆虫热和杂质感应感测的古典模型从根本上差异。在这里，我们表明，在抗体DSS中的双峰干神经元产生的尖峰突发可能有助于P.椭圆诊断的有害热的感觉。我们的电生理实验表明，在25℃的温度下，这些神经元从湿度常规尖刺到温度依赖性峰值爆裂。七个测量参数中的五个突发尖峰列车，爆发干燥神经元的百分比，斯蒂斯的CV在钉火车中，爆发的百分比，爆发的尖峰数量和爆发的isis是明确的依赖于温度，因此可以精确地编码有毒的高稳定温度，高达45℃，以及其快速的步骤变化。冷神经元开始在高于30-35℃的温度下产生温度依赖的尖峰突发。因此，两个神经元在有害热量中编码不同但很大的重叠范围。神经元树枝状分支和薄片的程度在很大程度上在不同的DSS中变化，这可能是它们在峰值爆裂的阈值温度变化的结构基础。

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