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Intestinal adaptation in atrophic rat ileum is accompanied by supersensitivity to vasoactive intestinal peptide, pituitary adenylate cyclase-activating peptide and nitric oxide

In English

Författare

Summary, in English

BACKGROUND: Intestinal inactivity leads to atrophic changes and concomitant alterations in the expression of neurotransmitters in the enteric nervous system. In atrophic rat ileum neurones expressing vasoactive intestinal peptide (VIP) and pituitary adenylate cyclase-activating peptide (PACAP) decrease in number while nitric oxide synthase (NOS) expressing neurones increase. Since little is known about functional changes accompanying intestinal atrophy the aim of the present study was to investigate relaxatory responses to VIP, PACAP-27 and nitric oxide (NO) in longitudinal smooth muscle from atrophic rat ileum. METHODS: To create a dysfunctional (atrophic) intestine, the distal 10 cm of rat ileum was surgically bypassed. In vitro experiments were carried out on longitudinal muscle strips from rat ileum having been sham-operated, one week or four weeks bypassed. RESULTS: The amplitudes of the relaxatory responses to PACAP-27, VIP and the NO-donor S-nitroso-N-acetylpenicillamine (SNAP), but not forskolin, were significantly increased in the one-week bypassed ileum. In the four-weeks bypassed ileum the VIP, PACAP-27, SNAP and forskolin evoked relaxations were of the same magnitude as those of the sham-operated. The augmented responses to both VIP and PACAP-27 could be blocked by pre-treatment with apamin while N(G)-nitro-L-arginine methyl ester (L-NAME) and tetrodotoxin were ineffective. In contrast to sham-operated and four-weeks bypassed ileum, cross-desensitization between VIP and PACAP-27 was noted after one week of bypass. CONCLUSION: Intestinal adaptation after bypassing the distal ileum of the rat includes a transient supersensitivity of the longitudinal muscle to the NO donor SNAP, VIP and PACAP-27. These augmented relaxatory responses may contribute to the hypomotility noted in inactive intestine.

Avdelning/ar

  • Neurogastroenterology

Publiceringsår

2001

Språk

Engelska

Sidor

251-257

Publikation/Tidskrift/Serie

Scandinavian Journal of Gastroenterology

Volym

36

Issue

3

Dokumenttyp

Artikel i tidskrift

Förlag

Taylor & Francis

Ämne

  • Gastroenterology and Hepatology

Nyckelord

  • Oxide
  • Apamin
  • Ileal
  • Bypass
  • Intestinal
  • Relaxation
  • Adaptation
  • Supersensitivity
  • Nitric
  • Pacap
  • Cyclase-ACTIVATING
  • Peptide
  • Adenylate
  • Pituitary
  • Vip
  • Vasoactive

Status

Published

Forskningsgrupp

  • Neurogastroenterology

ISBN/ISSN/Övrigt

  • ISSN: 1502-7708