Responses of the antennal bimodal hygroreceptor neurons to innocuous and noxious high temperatures in the carabid beetle, Pterostichus oblongopunctatus

Nurme, Karin; Merivee, Enno; Must, Anne; Sibul, Ivar; Muzzi, Maurizio; Giulio, Andrea Di; Williams, I. H.; Tooming, Ene

doi:10.1016/j.jinsphys.2015.06.010

Cited by 16 publications

(24 citation statements)

References 43 publications

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“…The FIB/SEM is equipped with two columns including one electron beam (SEM column) and one ion beam (FIB column), oriented at 52°, and focused on the same point of the sample (for further details on the FIB/SEM technique refer to Di Giulio et al, 2015 and Nurme et al, ).…”

Section: Methodsmentioning

confidence: 99%

Antennal fine morphology of the threatened beetle Osmoderma eremita (Coleoptera: Scarabaeidae), revealed by scanning electron microscopy

Zauli

Maurizi

Carpaneto

et al. 2016

Microscopy Res & Technique

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The aim of this study was to characterize the antennal morphology of Osmoderma eremita, a threatened scarab beetle inhabiting tree hollows. O. eremita males produce a sex pheromone, (R)-(+)-γ-decalactone, responsible mainly for the attraction of females but also other males. Gross and fine morphology of microstructures including sensilla, microsculpture and pores were analyzed using Scanning Electron Microscopy. The antenna of O. eremita showed the typical lamellicorn shape of scarab beetles, with a basal scape, a pedicel, a funicle composed of five antennomeres and a club composed of three lamellae. Six different subtypes of sensilla chaetica (Ch.1 - 6), Böhm sensilla (Bo), one subtype of sensilla basiconica (Ba.1), two subtypes of sensilla coeloconica (Co.1 - 2), two subtypes of sensilla placodea (Pl.1 - 2), pores and peculiar folds were described. The two sexes did not show any significant differences in the occurrence and number of the sensilla placodea, known to be responsible for the pheromone reception. Instead, some sexual differences were found on the occurrence and topology of three different microstructures: (1) one subtype of sensillum chaeticum (Ch.2) occurring on the pedicel only in males; (2) a characteristic pore occurring on the funicle only in males; (3) a peculiar fold occurring on different antennomeres of the funicle in the two sexes, on the fourth in males and on the fifth in females. A comparison between sensilla of O. eremita and those of other Scarabaeoidea is provided.

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Section: Methodsmentioning

confidence: 99%

Antennal fine morphology of the threatened beetle Osmoderma eremita (Coleoptera: Scarabaeidae), revealed by scanning electron microscopy

Zauli

Maurizi

Carpaneto

et al. 2016

Microscopy Res & Technique

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“…Our electrophysiological setup used in this study has been thoroughly described earlier (Nurme et al, 2015;Must et al, 2017), so only a brief general characterization is given here. The electrolytically sharpened, indifferent, tungsten microelectrode ( Figure 1B) was forced into the base of the flagellum by hand.…”

Section: Electrophysiology Extracellular Single Sensillum Recordingsmentioning

confidence: 99%

“…So far, temperature-sensitive neurons capable of properly encoding noxious heat in the range of 30-45 • C have been demonstrated only in the dome-shaped sensilla (DSS) of two carabid species, Pterostichus oblongopunctatus and Platynus assimilis, respectively (Must et al, 2010(Must et al, , 2017Nurme et al, 2015). The DSSs, earlier also incorrectly termed as campaniform sensilla, occur in small numbers on each antennal flagellomere of many carabid (Merivee et al, 2000(Merivee et al, , 2001(Merivee et al, , 2002Di Giulio et al, 2012) and elaterid beetles (Merivee et al, 1997(Merivee et al, , 1998(Merivee et al, , 1999Zauli et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

“…By their response modality and reaction type, the three antennal DSS neurons of carabids and elaterids are classified as the unimodal cold-hot neuron (CHN), the bimodal moist-hot neuron (MHN), and the bimodal dry-hot neuron (DHN), respectively (Nurme et al, 2015;Must et al, 2017). In earlier literature, these neurons are termed as the cold neuron, the moist neuron, and the dry neuron, respectively (Merivee et al, 2003(Merivee et al, , 2010Must et al, 2006a,b).…”

Section: Introductionmentioning

confidence: 99%

“…At moderate temperatures [20-25 (30) • C], the CHN, MHN, and DHN behave as a typical triad of insect cold, moist, and dry neuron, respectively. The firing rate of the CHN decreases or temporarily stops when confronted with a temperature step increase and vice versa; its spike production phasic-tonically increases in response to a rapid decrease in temperature (Merivee et al, 2003;Must et al, 2010;Nurme et al, 2015Nurme et al, , 2018. Stationary mean firing rate of the CHN unequivocally depends on temperature in some carabid species but not in others (Must et al, 2006a,b).…”

Section: Introductionmentioning

confidence: 99%

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Neural Code for Ambient Heat Detection in Elaterid Beetles

Merivee

Must

Nurme

et al. 2020

Front. Behav. Neurosci.

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Environmental thermal conditions play a major role at all levels of biological organization; however, there is little information on noxious high temperature sensation crucial in behavioral thermoregulation and survival of small ectothermic animals such as insects. So far, a capability to unambiguously encode heat has been demonstrated only for the sensory triad of the spike bursting thermo-and two bimodal hygrothermoreceptor neurons located in the antennal dome-shaped sensilla (DSS) in a carabid beetle. We used extracellular single sensillum recording in the range of 20-45 • C to demonstrate that a similar sensory triad in the elaterid Agriotes obscurus also produces high temperature-induced bursty spike trains. Several parameters of the bursts are temperature dependent, allowing the neurons in a certain order to encode different, but partly overlapping ranges of heat up to lethal levels in a graded manner. ISI in a burst is the most useful parameter out of six. Our findings consider spike bursting as a general, fundamental quality of the classical sensory triad of antennal thermo-and hygro-thermoreceptor neurons widespread in many insect groups, being a flexible and reliable mode of coding unfavorably high temperatures. The possible involvement of spike bursting in behavioral thermoregulation of the beetles is discussed. By contrast, the mean firing rate of the neurons in regular and bursty spike trains combined does not carry useful thermal information at the high end of noxious heat.

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Neuronal Compartmentalization: A Means to Integrate Sensory Input at the Earliest Stage of Information Processing?

2020

BioEssays

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In numerous peripheral sense organs, external stimuli are detected by primary sensory neurons compartmentalized within specialized structures composed of cuticular or epithelial tissue. Beyond reflecting developmental constraints, such compartmentalization also provides opportunities for grouped neurons to functionally interact. Here, the authors review and illustrate the prevalence of these structural units, describe characteristics of compartmentalized neurons, and consider possible interactions between these cells. This article discusses instances of neuronal crosstalk, examples of which are observed in the vertebrate tastebuds and multiple types of arthropod chemosensory hairs. Particular attention is paid to insect olfaction, which presents especially well‐characterized mechanisms of functional, cross‐neuronal interactions. These examples highlight the potential impact of peripheral processing, which likely contributes more to signal integration than previously considered. In surveying a wide variety of structural units, it is hoped that this article will stimulate future research that determines whether grouped neurons in other sensory systems can also communicate to impact information processing.

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Responses of the antennal bimodal hygroreceptor neurons to innocuous and noxious high temperatures in the carabid beetle, Pterostichus oblongopunctatus

Cited by 16 publications

References 43 publications

Antennal fine morphology of the threatened beetle Osmoderma eremita (Coleoptera: Scarabaeidae), revealed by scanning electron microscopy

Antennal fine morphology of the threatened beetle Osmoderma eremita (Coleoptera: Scarabaeidae), revealed by scanning electron microscopy

Neural Code for Ambient Heat Detection in Elaterid Beetles

Neuronal Compartmentalization: A Means to Integrate Sensory Input at the Earliest Stage of Information Processing?

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