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Effects of substance P and distribution of substance P-like immunoreactivity in nerves supplying the stomach of the cod, Gadus morhua

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Abstract

The innervation of the cod stomach by neurons showing substance P-like immunoreactivity (SPLI), and the effect and mechanism of action of substance P (SP) on the vascularly perfused cod stomach and on isolated muscle strip preparations from the pyloric sphincter have been investigated.

Infusion of SP produced a contraction of the stomach wall, which could not be blocked by tetrodotoxin, atropine or methysergide, indicating a direct effect on the stomach smooth muscle. Similarly, the contraction produced by SP on preparations from the pyloric sphincter was unaffected by tetrodotoxin.

Nerves showing SPLI were frequent in the myenteric plexus of the whole stomach, and in the submucosa and mucosa of the pyloric part of the stomach. SPLI was also observed in fibres in the intestinal branch of the vagus and occasionally in the splanchnic nerves. Ligation of the nerves showed an accumulation of SPLI above as well as below the ligature, being more prominent proximal to the ligature in the vagus and distal to the ligature in the splanchnic nerve. In the vagus nerve, descending and ascending SPLI-fibres were seen surrounding non-reactive cell bodies. No reduction in intensity of the immunoreaction of the neurons in the stomach wall was observed after ligation or sectioning of the vagosympathetic trunk or the splanchnic nerves, nor were SP-levels measured by radioimmunoassay reduced. After denervation of vagal branches close to the stomach wall an insignificant decrease of immunoreactivity was observed in the myenteric plexus. Capsaicin treatment had no conclusive effect on the distribution of SPLI.

It is concluded that the innervation showing SPLI may be of intrinsic as well as extrinsic origin, with pathways in both vagal and splanchnic branches. Only a direct effect of SP on the smooth muscle could be demonstrated.

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Authors and Affiliations

  1. Comparative Neuroscience Unit, Department of Zoophysiology, University of Göteborg, Medicinaregatan 18, 413 90, Göteborg, Sweden

    Jörgen Jensen, Paul Karila, Ann-Cathrine Jönsson, Göran Aldman & Susanne Holmgren

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  1. Jörgen Jensen
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  2. Paul Karila
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  3. Ann-Cathrine Jönsson
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  4. Göran Aldman
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  5. Susanne Holmgren
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Jensen, J., Karila, P., Jönsson, AC. et al. Effects of substance P and distribution of substance P-like immunoreactivity in nerves supplying the stomach of the cod, Gadus morhua . Fish Physiol Biochem 12, 237–247 (1993). https://doi.org/10.1007/BF00004371

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