Kupffer cells contain a glycine-gated chloride channel

Am J Physiol. 1997 Jun;272(6 Pt 1):G1581-6. doi: 10.1152/ajpgi.1997.272.6.G1581.


Here the effect of glycine on intracellular Ca2+ concentration ([Ca2+]i) in cultured Kupffer cells stimulated with lipopolysaccharide (LPS) was investigated to assess the possibility that they contain a glycine-gated chloride channel. LPS (10 micrograms/ml) increased [Ca2+]i rapidly, with peak values reaching 307 +/- 29 nM. Glycine (1 mM) prevented this increase nearly completely. Low concentrations of strychnine (1 microM), a glycine receptor antagonist, reversed the inhibitory effect of glycine completely; however, high concentrations of strychnine (1 mM) mimicked glycine. The effects of glycine and high-dose strychnine were prevented when cells were incubated in chloride-free buffer. Furthermore, potassium (25 mM) and LPS depolarized the Kupffer cell plasma membrane, whereas glycine caused hyperpolarization and prevented depolarization due to potassium and LPS. Moreover, tumor necrosis factor-alpha (TNF-alpha) production in cultured Kupffer cells due to LPS was decreased significantly by glycine. Therefore, it is concluded that Kupffer cells contain a glycine-gated chloride channel similar to that described previously in the central nervous system. Prevention of increases in [Ca2+]i due to LPS by activation of chloride influx reduced synthesis and release of toxic mediators by Kupffer cells.

Publication types

  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Animals
  • Calcium / metabolism*
  • Cells, Cultured
  • Chloride Channels / drug effects
  • Chloride Channels / physiology*
  • Chlorides / metabolism
  • Escherichia coli
  • Female
  • Glycine / pharmacology*
  • Ion Channel Gating / drug effects
  • Ion Channel Gating / physiology*
  • Kinetics
  • Kupffer Cells / physiology*
  • Lipopolysaccharides / pharmacology
  • Membrane Potentials / drug effects
  • Rats
  • Rats, Sprague-Dawley
  • Strychnine / pharmacology


  • Chloride Channels
  • Chlorides
  • Lipopolysaccharides
  • Strychnine
  • Calcium
  • Glycine