The present study investigated the chemical coding of neurons in the celiac-superior mesenteric ganglion complex supplying the normal (n = 4) and inflamed (n=4) ileum (chemically-in- duced inflammation) in juvenile pigs using retrograde tracing combined with immunohistochem- istry. Ileum-projecting neurons (IPN) were predominantly distributed in the left and right superior mesenteric pools of the ganglion. The majority of them were adrenergic (tyrosine hydroxylase-positive) and also contained neuropeptide Y, somatostatin or galanin. No clear-cut differences in the distribution and chemical coding of IPN were found between normal and inflamed pigs. However, in the inflamed group, the density of peptidergic, IPN-associated nerve fibres was higher than that found in the control group.
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