Abstract
Background
Hydrogen sulfide (H2S) is a gaseous signaling molecule that, similar to nitric oxide (NO), plays an important role as an inhibitor neurotransmitter in the digestive tract. This study aimed to investigate the effect of H2S and to identify neurogenic contraction responses dependent on the electrical field stimulation (EFS) in the isolated lower esophageal sphincters of rabbits.
Methods
An isolated lower esophageal sphincter was placed in an organ bath system and mechanical responses were recorded using a force transducer. The nerve-evoked contractile responses were obtained by EFS. The contractile responses were obtained as biphasic “on” and “off” phases seen at the beginning and end of EFS, respectively.
Results
Sodium hydrogen sulfide (NaHS) reduced the EFS-mediated “off” phase and the EFS-mediated non-adrenergic non-cholinergic (NANC) “off” phase. NaHS reduced the EFS-mediated “on” phase as well. l-Cysteine reduced the EFS-mediated “off” phase and the EFS-mediated NANC “off” phase. l-Propargylglycine (PAG) did not affect the EFS-mediated “off” phase or the EFS-mediated NANC “off” phase. NaHS, l-cysteine, and PAG reduced the EFS-mediated, NO-independent “off” phase. The effect of NaHS in all of the experiments returned in time. Also, NaHS caused significant relaxation of 80-mM KCl-Krebs solution induced-contractions, while l-cysteine and PAG did not cause a significant relaxation.
Conclusion
These findings suggest that H2S has an inhibitory effect on the lower esophageal sphincter muscle. While the effect of H2S on EFS-mediated responses disappeared in time, the effect of H2S sustained the KCl-Krebs solution-induced contractions. This shows that H2S may have an effect on neurotransmission at the nerve terminal.
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Kara, H., Isli, F., Ozturk Fincan, G.S. et al. The effects of hydrogen sulfide on electrical field stimulation-induced neurogenic contractile responses in isolated rabbit lower esophageal sphincter: Contribution of nitrergic and non-adrenergic non-cholinergic transmission. Pharmacol. Rep 68, 1350–1357 (2016). https://doi.org/10.1016/j.pharep.2016.09.007
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DOI: https://doi.org/10.1016/j.pharep.2016.09.007