Electrical properties and cell-to-cell communication of the salivary gland cells of the snail, Helix pomatia

Zsolt Pirger, Károly Elekes, Tibor Kiss

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The aim of the present study was to assess the cellular mechanism of secretion in the salivary gland of the snail, Helix pomatia, using electrophysiological, electron microscopic and immunohistochemical techniques. A homogeneously distributed membrane potential (- 56.6 ± 9.8 mV) was determined mainly by a K+-electrochemical gradient and partly by the contribution of the electrogenic Na+-pump and Cl- conductance. Low resistance electrical coupling sites were identified physiologically. Transmission electron microscopy and innexin 2 antibody revealed the presence of gap-junction-like membrane structures between gland cells. It is suggested that gap-junctions are sites of electrotonic intercellular communication, which integrate the gland cells into a synchronized functional unit in the acinus. Stimulation of the salivary nerve elicited secretory potentials (depolarization) which could be mimicked by local application of acetylcholine, dopamine or serotonin. In voltage-clamp experiments four major conductances were identified: a delayed rectifier (IK), a transient (IA) and a Ca2+-activated outward K+ current (IK(Ca)) and Ca2+-inward currents (ICa). It is suggested that one or more of these conductances may give rise to a stimulus activated secretory potential leading to excitation-secretion coupling and subsequent the release of the mucus from the gland cells.

Original languageEnglish
Pages (from-to)7-19
Number of pages13
JournalComparative Biochemistry and Physiology - A Molecular and Integrative Physiology
Volume145
Issue number1
DOIs
Publication statusPublished - Sep 2006

Keywords

  • Cell contacts
  • Gap-junction
  • Innexin
  • Ion-channels
  • K-currents
  • Salivary gland
  • Secretion
  • Secretory potential
  • Snail

ASJC Scopus subject areas

  • Biochemistry
  • Physiology
  • Molecular Biology

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