Bursty spike trains of antennal thermo- and bimodal hygro-thermoreceptor neurons encode noxious heat in elaterid beetles
| Autor: | Marika Mänd, Karin Nurme, Enno Merivee, Anne Must, Maurizio Muzzi, Andrea Di Giulio, Ingrid H. Williams |
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| Přispěvatelé: | Nurme, K, Merivee, E, Must, A, Di Giulio, A, Muzzi, M, Williams, I, Mänd, M |
| Rok vydání: | 2018 |
| Předmět: |
0301 basic medicine
inner structure Hot Temperature Physiology Action Potentials Sensory system behavioural thermoregulation Biochemistry 03 medical and health sciences Bursting 0302 clinical medicine moist-hot neuron dry-hot neuron medicine Animals Critical thermal maximum Sensilla Neurons Chemistry coldhot neuron Nociceptors Thermoreceptors Temperature induced dome-shaped sensillum Behavioural thermoregulation Coleoptera Electrophysiology 030104 developmental biology medicine.anatomical_structure nervous system Biophysics Thermoreceptor Neuron General Agricultural and Biological Sciences Locomotion 030217 neurology & neurosurgery Developmental Biology |
| Zdroj: | Journal of Thermal Biology. 72:101-117 |
| ISSN: | 0306-4565 |
| DOI: | 10.1016/j.jtherbio.2018.01.008 |
| Popis: | The main purpose of this study was to explain the internal fine structure of potential antennal thermo- and hygroreceptive sensilla, their innervation specifics, and responses of the sensory neurons to thermal and humidity stimuli in an elaterid beetle using focused ion beam scanning electron microscopy and electrophysiology, respectively. Several essential, high temperature induced turning points in the locomotion were determined using automated video tracking. Our results showed that the sensilla under study, morphologically, are identical to the dome-shaped sensilla (DSS) of carabids. A cold-hot neuron and two bimodal hygro-thermoreceptor neurons, the moist-hot and dry-hot neuron, innervate them. Above 25–30 °C, all the three neurons, at different threshold temperatures, switch from regular spiking to temperature dependent spike bursting. The percentage of bursty DSS neurons on the antenna increases with temperature increase suggesting that this parameter of the neurons may encode noxious heat in a graded manner. Thus, we show that besides carabid beetles, elaterids are another large group of insects with this ability. The threshold temperature of the beetles for onset of elevated locomotor activity (OELA) was lower by 11.9 °C compared to that of critical thermal maximum (39.4 °C). Total paralysis occurred at 41.8 °C. The threshold temperatures for spike bursting of the sensory neurons in DSS and OELA of the beetles coincide suggesting that probably the spike bursts are responsible for encoding noxious heat when confronted. In behavioural thermoregulation, spike bursting DSS neurons serve as a fast and firm three-fold early warning system for the beetles to avoid overheating and death. |
| Databáze: | OpenAIRE |
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