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Comparative distribution of vasoactive intestinal polypeptide (VIP), substance P and PHI in the enteric sphincters of
Experientia
|May 15, 1984
Abstract:
In the feline gastrointestinal tract, the neuropeptides, substance P, VIP and PHI were investigated by specific radioimmunoassays and immunocytochemistry. The concentrations of all 3 peptides and the level of peptidergic innervation were significantly less in the anal sphincter than elsewhere, whereas no significant differences were seen between other sphincter and non-sphincter regions.