Ecabet sodium induces neuronal nitric oxide synthase-derived nitric oxide synthesis and gastric adaptive relaxation in the human stomach
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Abstract
Background
Gastric adaptive relaxation (GAR) is a major factor of functional dyspepsia (FD). Nitric oxide (NO) could be the key molecule responsible for GAR. We previously reported that the physiological gastric reservoir ability can be evaluated by measuring the cross-sectional area of the proximal stomach by abdominal ultrasonography (US). Ecabet sodium (ES), a gastro-protective antiulcer agent, has been shown to improve symptoms in FD patients. We examined the effects of ES on GAR in humans and on NO synthesis in vitro.
Methods
GAR was measured by US in 14 subjects, 8 of whom had a pressure sensor inserted into their stomach, after treatment with ES, placebo, or no drugs. NO was measured in SH-SY 5Y cells using a fluorescent indicator. Neuronal, endothelial and inducible NO synthase (nNOS, eNOS and iNOS, respectively) expressions were examined in SH-SY 5Y cells by Western blotting.
Results
Compared to placebo, ES induced significantly greater dilatation of the proximal stomach after the subjects drank 300–400 ml water (P < 0.05). After ES intake, the intragastric pressure did not change significantly, but it tended to be lower (n = 8; P = 0.15). ES increased NO production and nNOS expression, but not iNOS or eNOS expression, in SH-SY 5Y cells in vitro. Pretreatment with non-selective NO synthase (NOS) inhibitor, but not with iNOS-selective inhibitor, reduced NO production by ES.
Conclusion
ES may promote GAR in humans through nNOS-related NO; therefore, it may be useful for patients with FD.
Keywords
Ecabet sodium Functional dyspepsia Gastric adaptive relaxation Nitric oxide UltrasonographyAbbreviations
- ANOVA
Analysis of variance
- CGRP
Calcitonin gene-related peptide
- CPSN
Capsaicin-sensitive afferent nerves
- DAF-2
Diaminofluorescein-2
- ES
Ecabet sodium
- FD
Functional dyspepsia
- GAR
Gastric adaptive relaxation
- NO
Nitric oxide
- NOS
Nitric oxide synthase
- nNOS
Neuronal nitric oxide synthase
- eNOS
Endothelial nitric oxide synthase
- iNOS
Inducible nitric oxide synthase
- US
Ultrasonography
Notes
Acknowledgments
We thank Professor Masaharu Yoshihara (Health Service Center of Hiroshima University) and Professor Yukihito Higashi (Department of Cardiovascular Physiology and Medicine, Hiroshima University) for their valuable suggestions. This study was carried out at the Analysis Center of Life Science, Hiroshima University.
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