Summary
The distribution and cellular localization of substance P in the chicken gut was studied by immunocytochemistry and immunochemistry. Substance P-containing nerve fibers are numerous in the gut wall. They occur in the smooth muscle layer as well as in the mucosa, where they are associated with blood vessels or surround the intestinal crypts. The fibers are particularly numerous in the myenteric and submucosal plexuses, where substance P-containing nerve-cell perikarya are also encountered. Substance P was found also in scattered endocrine cells of the small intestine, caeca and colon. Previously, bombesin-containing cells, which are numerous in the proventriculus, have been mistakenly identified as substance P cells due to crossreactivity of certain antisera against substance P. Immunochemistry revealed the highest concentration of substance P in the duodenum. The gel chromatographic behavior of chicken substance P differs slightly from that of synthetic bovine substance P, suggesting that chicken substance P differs structurally from mammalian substance P. Substance P-containing nerve fibers in the chicken gut develop slowly after hatching, apparently beginning in the duodenum; at approximately 20 weeks after hatching the distribution pattern is fully developed.
A functional investigation was performed on the isolated chicken caecum to clarify the role of substance P in the contractile behavior of smooth muscle. Substance P contracted the caecum over a wide dose range; the contractile response was greater in 20 week-old chickens than in 4 and 10 week-old animals. Electrical field stimulation caused a relaxation of the caecum and a contraction upon cessation of stimulation. Neither of these responses, both of which are neurally mediated, were inhibited by adrenergic and cholinergic blockade. It is conceivable that the contractile response following electrical stimulation is caused by substance P released from nerve fibers in the smooth muscle.
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Brodin, E., Alumets, J., Håkanson, R. et al. Immunoreactive substance P in the chicken gut: Distribution, development and possible functional significance. Cell Tissue Res. 216, 455–469 (1981). https://doi.org/10.1007/BF00238643
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DOI: https://doi.org/10.1007/BF00238643