The activity of isolated snail neurons controlling locomotion is affected by glucose

Varvara Dyakonova*, László Hernádi, Etsuro Ito, Taisia Dyakonova, Igor Zakharov, Dmitri Sakharov

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


The involvement of serotonin in mediating hunger-related changes in behavioral state has been described in many invertebrates. However, the mechanisms by which hunger signals to serotonergic cells remain unknown. We tested the hypothesis that serotonergic neurons can directly sense the concentration of glucose, a metabolic indicator of nutritional state. In the snail Lymnaea stagnalis, we demonstrate that completely isolated pedal serotonergic neurons that control locomotion changed their biophysical characteristics in response to glucose application by lowering membrane potential and decreasing the firing rate. Additionally, the excitatory response of the isolated serotonergic neurons to the neuroactive microenvironment of the pedal ganglia was significantly lowered by glucose application. Because hunger has been reported to increase the activity of select neurons and their responses to the pedal ganglia microenvironment, these responses to glucose are in accordance with the hypothesis that direct glucose signaling is involved in the mediation of the hunger-related behavioral state.

Original languageEnglish
Pages (from-to)55-60
Number of pages6
JournalBiophysics (Japan)
Publication statusPublished - 2015
Externally publishedYes


  • Behavioral state
  • Extrasynaptic release
  • Lymnaea stagnalis
  • Serotonergic neuron
  • Volume transmission

ASJC Scopus subject areas

  • Biophysics


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