Damage to the enteric nervous system in experimental colitis.

Area of Science:

• Neuroscience
• Gastroenterology
• Immunology

Background:

• Intestinal inflammation impacts the enteric nervous system, causing pain and altered motility.
• While some damage may reverse, persistent neuronal injury can contribute to inflammatory bowel disease (IBD) and post-enteritis irritable bowel syndrome.

Purpose of the Study:

• To investigate the long-term effects of chemically induced colitis on enteric neuron survival and distribution in rats.
• To assess the neuroprotective potential of budesonide in preventing inflammation-induced neuronal loss.

Main Methods:

• Colitis was induced in male Sprague-Dawley rats using dinitrobenzene sulfonic acid.
• Immunocytochemistry was employed to quantify enteric neuron numbers and distribution at various time points post-induction (up to 35 days).
• The impact of topical budesonide on neuronal loss was evaluated in a dose-dependent manner.

Main Results:

• Significant enteric neuronal loss occurred within 24 hours of inflammation, with only 49% of neurons remaining by days 4-6.
• A decrease in submucosal plexus ganglia was observed, while myenteric ganglia numbers remained constant.
• Despite neuronal loss and smooth muscle hyperplasia, axonal density in the smooth muscle layer was preserved.
• Budesonide treatment dose-dependently prevented neuronal loss.

Conclusions:

• Intestinal inflammation causes substantial and persistent enteric neurodegeneration.
• The submucosal plexus appears more vulnerable to inflammatory damage than the myenteric plexus.
• Therapeutic strategies for IBD should consider the impact on neural components, with budesonide showing neuroprotective effects.