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Am J Physiol Gastrointest Liver Physiol 279: G990-G997, 2000;
0193-1857/00 $5.00
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Vol. 279, Issue 5, G990-G997, November 2000

Effect of splanchnectomy on jejunal motility and Fos expression in brain stem after intestinal anaphylaxis in rat

R. Brent Scott1, Daimen T. M. Tan1, and Keith A. Sharkey1,2

1 Gastrointestinal Research Group, Department of Pediatrics, and 2 Neuroscience Research Group, Department of Physiology and Biophysics, Faculty of Medicine, University of Calgary, Calgary, Alberta, Canada T2T 5C7

This study was to determine whether alterations in jejunal motility observed after antigen challenge of sensitized rats occurred after extirpation of the celiac-superior mesenteric ganglia. Hooded-Lister rats were prepared with an intact or extirpated celiac-superior mesenteric ganglion, an isolated Thiry-Vella loop of ileum for instillation of antigen, and jejunal electrodes for myoelectric recording. Animals were sensitized by injection of 10 µg egg albumin (EA, ip), and specific anti-EA IgE titers were determined to be >1:64. In both control and splanchnectomized rats, normal fasting migrating myoelectric complexes (MMC) were observed before challenge with EA. MMCs were disrupted, and diarrhea was observed immediately after EA challenge of control but not splanchnectomized animals. Brain stems were removed and processed for Fos immunoreactivity. The absence of perivascular neuropeptide Y immunoreactivity in the submucosa was used to confirm the success of splanchnectomy. The number of Fos-immunoreactive neuronal nuclei was significantly reduced in the brain stem after splanchnectomy. Thus the mesenteric sympathetic ganglia are an integral part of the extramural neuronal pathways required for altered motility in this model of intestinal anaphylaxis.

mast cell; nucleus of the solitary tract; prevertebral ganglia; dorsal motor nucleus of the vagus


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