Abstract
Calcitonin gene-related peptide (CGRP) is a marker of afferent fibres in the upper gastrointestinal tract, being almost completely depleted following treatment with selective neurotoxin capsaicin. Decreased levels of gastric CGRP-like immunoreactivity (li) were observed during acetic acid-, cysteamine-, concentrated ethanol- and water immersion stress-ulcers. The ulcerogens did not affect tissue content of other peptides, suggesting that reduction in gastric CGRP-li cannot be attributed only to the tissue damage and, moreover, restoration of CGRP-li was observed in animals with ulcers in healing status. These findings, together with the observation that CGRP could be released during increased acid-back diffusion, suggest the involvement of CGRP during gastric ulcer formation.
Similar results were obtained in duodenal ulcers produced by cysteamine, dulcerozine or mepirizole. Decrease in duodenal CGRP-li and substance P (SP)-li was associated with the development of gastroduodenal ulcers. In a rat model of colitis, such as that induced by trinitrobenzenesulphonic acid (TNB), decreased levels of colonic CGRP-li were observed during both acute and late phases of colitis.
These findings show that sensory neuropeptides are involved in several experimental diseases and may play a significant role in their pathogenesis.
Correspondence
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Evangelista, S., Renzi, D. (1997). Changes of Sensory Neuropeptides in Experimental Gastrointestinal Diseases. In: Gaginella, T.S., Mózsik, G., Rainsford, K.D. (eds) Biochemical Pharmacology as an Approach to Gastrointestinal Disorders. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5390-4_16
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DOI: https://doi.org/10.1007/978-94-011-5390-4_16
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