Gastric Electrical Stimulation Decreases Gastric Distension-Induced Central Nociception Response through Direct Action on Primary Afferents |
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| Authors: | Wassila Ouelaa Ibtissem Ghouzali Ludovic Langlois Serguei Fetissov Pierre Déchelotte Philippe Ducrotté Anne Marie Leroi Guillaume Gourcerol |
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| Institution: | 1. Nutrition, Gut & Brain Unit (ADEN – INSERM U1073), Institute for Biomedical Research and innovation, Rouen University, Rouen, France.; 2. Department of Nutrition, Rouen University Hospital, Rouen, France.; 3. Department of Gastroenterology, Rouen University Hospital, Rouen, France.; 4. Department of Physiology, Rouen University Hospital, Rouen, Rouen, France.; University of Cincinnati, United States of America, |
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| Abstract: | Background & AimsGastric electrical stimulation (GES) is an effective therapy to treat patients with chronic dyspepsia refractory to medical management. However, its mechanisms of action remain poorly understood.MethodsGastric pain was induced by performing gastric distension (GD) in anesthetized rats. Pain response was monitored by measuring the pseudo-affective reflex (e.g., blood pressure variation), while neuronal activation was determined using c-fos immunochemistry in the central nervous system. Involvement of primary afferents was assessed by measuring phosphorylation of ERK1/2 in dorsal root ganglia.ResultsGES decreased blood pressure variation induced by GD, and prevented GD-induced neuronal activation in the dorsal horn of the spinal cord (T9–T10), the nucleus of the solitary tract and in CRF neurons of the hypothalamic paraventricular nucleus. This effect remained unaltered within the spinal cord when sectioning the medulla at the T5 level. Furthermore, GES prevented GD-induced phosphorylation of ERK1/2 in dorsal root ganglia.ConclusionsGES decreases GD-induced pain and/or discomfort likely through a direct modulation of gastric spinal afferents reducing central processing of visceral nociception. |
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