Central neuropeptide Y receptors are involved in 3rd ventricular ghrelin induced alteration of colonic transit time in conscious fed rats.

Abstract:

BACKGROUND:Feeding related peptides have been shown to be additionally involved in the central autonomic control of gastrointestinal functions. Recent studies have shown that ghrelin, a stomach-derived orexigenic peptide, is involved in the autonomic regulation of GI function besides feeding behavior. Pharmacological evidence indicates that ghrelin effects on food intake are mediated by neuropeptide Y in the central nervous system. METHODS:In the present study we examine the role of ghrelin in the central autonomic control of GI motility using intracerobroventricular and IP microinjections in a freely moving conscious rat model. Further the hypothesis that a functional relationship between NPY and ghrelin within the CNS exists was addressed. RESULTS:ICV injections of ghrelin (0.03 nmol, 0.3 nmol and 3.0 nmol/5 microl and saline controls) decreased the colonic transit time up to 43%. IP injections of ghrelin (0.3 nmol - 3.0 nmol kg(-1) BW and saline controls) decreased colonic transit time dose related. Central administration of the NPY1 receptor antagonist, BIBP-3226, prior to centrally or peripherally administration of ghrelin antagonized the ghrelin induced stimulation of colonic transit. On the contrary ICV-pretreatment with the NPY2 receptor antagonist, BIIE-0246, failed to modulate the ghrelin induced stimulation of colonic motility. CONCLUSION:The results suggest that ghrelin acts in the central nervous system to modulate gastrointestinal motor function utilizing NPY1 receptor dependent mechanisms.

journal_name

BMC Gastroenterol

journal_title

BMC gastroenterology

authors

Tebbe JJ,Tebbe CG,Mronga S,Ritter M,Schäfer MK

doi

10.1186/1471-230X-5-5

keywords:

subject

Has Abstract

pub_date

2005-02-18 00:00:00

pages

5

issn

1471-230X

pii

1471-230X-5-5

journal_volume

5

pub_type

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