Abstract

Irradiation was administered to the upper abdomen of rats, whereupon the duodenum was examined. Numerous vasoactive intestinal peptide (VIP)- and substance P (SP)-like immunoreactive nerve fibers were seen in the damaged mucosa, often in close association to each other. The intensity of the SP- and VIP-like immunoreaction was increased in several of the tissue compartments and, as measured with radioimmunoassay, the contents of SP- and VIP-like materials were increased after 30 Gray. The results show that SP and VIP levels increase after irradiation and suggest that SP and VIP are involved in interactive reactions in the reorganization and inflammatory processes in the gut after abdominal irradiation.

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