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Novel orexigenic pathway prostaglandin D(2)-NPY system - Involvement in orally active orexigenic δ opioid peptide.
MedLine Citation:
PMID:  23141054     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Prostaglandin (PG) D(2), the most abundant PG in the central nervous system (CNS), is a bioactive lipid having various central actions including sleep induction, hypothermia and modulation of the pain response. We found that centrally administered PGD(2) stimulates food intake via the DP(1) among the two receptor subtypes for PGD(2) in mice. Hypothalamic mRNA expression of lipocalin-type PGD synthase (L-PGDS), which catalyzes production of PGD(2) from arachidonic acid via PGH(2) in the CNS, was increased after fasting. Central administration of antagonist and antisense ODN for the DP(1) receptor remarkably decreased food intake, body weight and fat mass. The orexigenic activity of PGD(2) was also blocked by an antagonist of Y(1) receptor for NPY, the most potent orexigenic peptide in the hypothalamus. Thus, the central PGD(2)-NPY system may play a critical role in food intake regulation under normal physiological conditions. We also found that orally active orexigenic peptide derived from food protein activates the PGD(2)-NPY system, downstream of δ opioid receptor. We revealed that the δ agonist peptide, rubiscolin-6-induced orexigenic activity was mediated by L-PGDS in the leptomeninges but not parenchyma using conditional knockout mice. In this review, we discuss the PGD(2)-NPY system itself, and orexigenic signals to activate it.
Authors:
Kentaro Kaneko; Masaaki Yoshikawa; Kousaku Ohinata
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-11-8
Journal Detail:
Title:  Neuropeptides     Volume:  -     ISSN:  1532-2785     ISO Abbreviation:  Neuropeptides     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-12     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8103156     Medline TA:  Neuropeptides     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012 Elsevier Ltd. All rights reserved.
Affiliation:
Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Gokasho Uji, Kyoto 611-0011, Japan.
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