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Peptide-containing neurons intrinsic to the gut wall

An experimental study in the pig

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Summary

Nerve fibers containing substance P, VIP, enkephalin or somatostatin are numerous in the porcine gut wall. They are particularly numerous in the submucosal and myenteric plexuses where peptide-containing cell bodies are also observed. Peptide-containing nerve fibers occur also in the vagus nerves, suggesting that the gut receives an extrinsic supply of peptidergic nerves. The extrinsic contribution to the peptide-containing nerve supply of the gut wall has not yet been quantitatively assessed. In an attempt to clarify this question pigs were subjected to bilateral subdiaphragmatic vagotomy. Another group of animals was subjected to complete extrinsic denervation by autotransplantation of a jejunal segment. The pigs were killed at various time intervals after the operations; the longest time interval studied was four months. Following vagotomy the innervation pattern of the jejunum appeared completely unaffected. Following complete extrinsic denervation the adrenergic nerve fibers disappeared, while peptide-containing and acetylcholinesterase-positive nerve fibers remained apparently unaltered. This was confirmed chemically in the case of substance P.

The motor activity of smooth muscle from the jejunum was studied in vitro. At low stimulation frequencies the smooth muscle from control jejunum responded by relaxation; upon cessation of stimulation a contraction occurred. With increasing stimulation frequencies the duration of the relaxation decreased; at high frequency stimulation only a contraction was recorded. In the autotransplant low frequency stimulation induced no or only a weak relaxation; high frequency stimulation induced contraction. After cholinergic and adrenergic blockade, the muscle responded with relaxation at all frequencies; the response was similar in innervated and denervated specimens. On the whole, the effects of extrinsic denervation on the motor activity of smooth muscle from porcine jejunum were minor, possibly reflecting the high degree of autonomy of the gut.

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Authors and Affiliations

  1. Departments of Pediatric Surgery, University of Lund, Sweden

    G. Malmfors & T. Holmin

  2. Departments of Pharmacology, University of Lund, Sweden

    S. Leander & R. Håkanson

  3. Departments of Histology, University of Lund, Sweden

    F. Sundler

  4. Department of Pharmacology, Karolinska Institute, Stockholm, Sweden

    E. Brodin

Authors
  1. G. Malmfors
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  2. S. Leander
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  3. E. Brodin
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  4. R. Håkanson
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  5. T. Holmin
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  6. F. Sundler
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Malmfors, G., Leander, S., Brodin, E. et al. Peptide-containing neurons intrinsic to the gut wall. Cell Tissue Res. 214, 225–238 (1981). https://doi.org/10.1007/BF00249207

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