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Journal of Evolutionary Biochemistry and Physiology

, Volume 54, Issue 5, pp 400–407 | Cite as

Role of Potassium Channels in the Effects of Hydrogen Sulfide on Contractility of Gastric Smooth Muscle Cells in Rats

  • I. F. Shaidullov
  • M. U. Shafigullin
  • L. M. Gabitova
  • F. G. Sitdikov
  • A. L. Zefirov
  • G. F. Sitdikova
Comparative and Ontogenic Physiology
  • 7 Downloads

Abstract

The effect of sodium hydrosulfide (NaHS), a hydrogen sulfide (H2S) donor, on spontaneous contractile activity of rat gastric smooth muscle cells was analyzed. Experiments were conducted on gastric stripes under conditions of isometric contraction. It was shown that NaHS has a biphasic effect on spontaneous contractile activity, increasing tonic tension and the amplitude of phasic contractions within the first minutes since application. This initial phase is followed by a decrease in amplitude, basal tone, and frequency of spontaneous contractions. The inhibitory effect of NaHS was dose-dependent at concentrations from 10 to 600 μM. Preliminary application of tetraethylammonium and 4-aminopirydine, inhibitors of voltage-gated and calciumactivated potassium channels, prevented a NaHS-induced initial increase in basal tone and phasic contraction amplitude. Activation of ATP-dependent potassium channels (KATP-channels) by diazoxide prevented in part a NaHS-induced decrease in basal tone and amplitude of spontaneous contractions. Glibenclamide, an inhibitor of KATP-channels, decreased the inhibitory effect of NaHS on amplitude, basal tone and frequency of spontaneous contractions. It was concluded that in rat gastric smooth muscles the excitatory effect of H2S is mediated by the inhibition of voltagegated and calcium-activated potassium channels, while its inhibitory effect involves the activation of KATP-channels.

Key words

rat gastric smooth muscle cells hydrogen disulfide contractility voltage-gated and calcium-activated potassium channels ATP-dependent potassium channels 

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Copyright information

© Pleiades Publishing, Inc. 2018

Authors and Affiliations

  • I. F. Shaidullov
    • 1
  • M. U. Shafigullin
    • 1
  • L. M. Gabitova
    • 1
  • F. G. Sitdikov
    • 1
  • A. L. Zefirov
    • 2
  • G. F. Sitdikova
    • 1
  1. 1.Kazan Federal UniversityKazanRussia
  2. 2.Kazan State Medical UniversityKazanRussia

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