The effects of amiloride on the labellar taste receptor cells of the fleshfly Boettcherisca peregrina

Tetsushi Sadakata, Hiromi Hatano, Takaya Koseki, Masayuki Koganezawa, Ichiro Shimada

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Amiloride is known to inhibit the taste response of vertebrates to salt by blocking the amiloride-sensitive sodium channel. In this study, we investigated electrophysiologically the effect of amiloride on the taste response of the fleshfly Boettcherisca peregrina. When 0.5 mM amiloride was included in taste solutions, the response of the salt receptor cell (salt response) to sodium chloride (NaCl) was not depressed but those of the sugar receptor cell (sugar responses) to sucrose, glucose, fructose, L-valine (L-Val) and L-phenylalanine (L-Phe) were strongly depressed. An inhibitory effect of amiloride on the concentration-response relationship for both sucrose and L-Phe was clearly revealed, but not at high concentrations of sucrose. After pretreatment of a chemosensory seta with 0.15 mM amiloride for 10 min, the salt response to NaCl was not affected. On the other hand, the sugar responses to sucrose, fructose, L-Val and L-Phe were depressed just after amiloride pretreatment. The sugar response to adenosine 5'-diphosphate (ADP) mixed with 0.5 mM amiloride was not depressed, but the response to ADP alone was depressed after amiloride pretreatment. It was therefore observed that amiloride depressed the responses to all stimulants that react with each of the receptor sites of the sugar receptor cell.

Original languageEnglish
Pages (from-to)565-570
Number of pages6
JournalJournal of Insect Physiology
Volume48
Issue number5
DOIs
Publication statusPublished - 2002 Jan 1

Keywords

  • Amiloride
  • Chemoreception
  • Fleshfly
  • Salt receptor cell
  • Sugar receptor cell

ASJC Scopus subject areas

  • Physiology
  • Insect Science

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