Central action of interleukin 1 beta on intestinal motility in rats: mediation by two mechanisms.
BACKGROUND
Interleukin 1 (IL-1) can influence gut functions by inhibiting gastric acid secretion. This study was performed to investigate the effects of IL-1 on intestinal motility and the mechanisms involved.


METHODS
The effects of IL-1 beta were determined by electromyography in conscious rats with implanted electrodes and a permanent catheter in a lateral brain ventricle.


RESULTS
Intracerebroventricular IL-1 beta (15 ng) administered to fed rats immediately stimulated cecocolonic spike bursts and caused a migrating myoelectric complex pattern after a delay in the small intestine. Tenfold higher doses of peripherally administered IL-1 beta did not promote similar reactions. The IL-1 antagonist reduced the small intestinal effect of IL-1 beta and blocked the cecocolonic stimulation. Indomethacin and SC 19220 reduced the small intestinal effects but did not antagonize the increase in cecocolonic contractions. In contrast, alpha-helical CRF9-41 blocked the increase of cecocolonic contractions but did not antagonize the IL-1 beta-induced effects on the small intestine.


CONCLUSIONS
IL-1 beta's effects on intestinal motility can be mainly ascribed to a central action. The cecocolonic stimulation may be mediated by brain corticotropin-releasing factor, whereas the small intestinal effects involve a prostaglandin mediation.
Fargeas
M J
MJ
Department of Pharmacology, Institut National de la Recherche Agronomique, Toulouse, France.
Fioramonti
J
J
Bueno
L
L
D000818:Animals; D001921:Brain / Q000187:drug effects*; D002432:Cecum / Q000187:drug effects / Q000502:physiology; D003106:Colon / Q000187:drug effects / Q000502:physiology; D003346:Corticotropin-Releasing Hormone / Q000494:pharmacology; D004386:Duodenum / Q000187:drug effects / Q000502:physiology; D005769:Gastrointestinal Motility / Q000187:drug effects*; D007213:Indomethacin / Q000494:pharmacology; D007276:Injections, Intraventricular; D053590:Interleukin 1 Receptor Antagonist Protein; D007375:Interleukin-1 / Q000008:administration & dosage / Q000494:pharmacology*; D007583:Jejunum / Q000187:drug effects / Q000502:physiology; D008297:Male; D010446:Peptide Fragments / Q000494:pharmacology; D051381:Rats; D017208:Rats, Wistar; D012795:Sialoglycoproteins / Q000494:pharmacology
D053590:Interleukin 1 Receptor Antagonist Protein; D007375:Interleukin-1; D010446:Peptide Fragments; D012795:Sialoglycoproteins; D003346:Corticotropin-Releasing Hormone; C045089:corticotropin releasing hormone (9-41); D007213:Indomethacin