title: Evidence that endogenous hydrogen sulfide exerts an excitatory effect on gastric motility in mice.
abstract: The present study was designed to investigate the effect of endogenous hydrogen sulfide (H₂S) on gastric motility in mice. Western blotting and immunocytochemistry were used to determine expression levels of the H₂S-producing enzymes cystathionine-β-synthase (CBS) and cystathionine-γ-lyase (CSE) in gastric tissues and cultured smooth muscle cells. Physiological and intracellular recordings and the whole-cell patch clamp technique were used to evaluate the effect of H₂S on the mechanical and electrical activities in muscle strips and in isolated smooth muscle cells, respectively. The results showed that CBS and CSE were expressed in mouse gastric smooth muscle. NaHS, a H₂S donor, inhibited the amplitude and frequency of spontaneous contraction at high concentrations (>200 μM). However, NaHS at low concentrations (<100 μM) enhanced the basal tension and increased the contractile amplitude of muscle strips. This excitatory effect was not altered by the blockade of the enteric nerve with TTX, but was abolished by tetraethylammonium (TEA) or 4-aminopyridine (4-AP). Aminooxyacetic acid (AOA), but not propargylglycine (PAG), caused a concentration-dependent inhibition of spontaneous contraction. This effect was restored by L-cysteine and NaHS. In addition, NaHS at low concentrations (<100 μM) produced a depolarization of the membrane potential, whereas AOA hyperpolarized the membrane potential and decreased the amplitude of slow waves. Furthermore, AOA increased whole-cell delayed rectifier K⁺ current (I(K(V))). These findings suggest that endogenous H₂S appears to be an excitatory gaseous mediator during physiological regulation of gastric motility and this excitable effect is mediated by depolarization of the membrane potential via inhibition of I(K(V)).
authors: Department of Physiology, Shanghai Jiaotong University School of Medicine, 800 Dongchuan Road, 328 Wenxuan Medical Building, Shanghai 200240, China.
authors: Yan-fei
authors: YF
authors: Han
authors: Xu
authors: X
authors: Huang
authors: Xin
authors: X
authors: Guo
authors: Yi-song
authors: YS
authors: Wu
authors: Dong-hai
authors: DH
authors: Liu
authors: Hong-li
authors: HL
authors: Lu
authors: Young-chul
authors: YC
authors: Kim
authors: Wen-xie
authors: WX
authors: Xu
mesh_terms: D000818:Animals; D015153:Blotting, Western; D003541:Cystathionine beta-Synthase / Q000378:metabolism; D003542:Cystathionine gamma-Lyase / Q000378:metabolism; D051668:Delayed Rectifier Potassium Channels / Q000037:antagonists & inhibitors* / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D005769:Gastrointestinal Motility; D006862:Hydrogen Sulfide / Q000378:metabolism*; D007150:Immunohistochemistry; D008297:Male; D008564:Membrane Potentials / Q000187:drug effects; D051379:Mice; D008813:Mice, Inbred ICR; D032389:Myocytes, Smooth Muscle / Q000378:metabolism; D018408:Patch-Clamp Techniques; D013440:Sulfides / Q000008:administration & dosage / Q000494:pharmacology*
chemical_list: D051668:Delayed Rectifier Potassium Channels; D013440:Sulfides; D003541:Cystathionine beta-Synthase; D003542:Cystathionine gamma-Lyase; C025451:sodium bisulfide; D006862:Hydrogen Sulfide