Intracerebroventricular (ICV) injections of pituitary adenylate cyclase-activating polypeptide-38 (PACAP) and vasoactive intestinal peptide (VIP) inhibit feeding in chicks. However, the precise anorexigenic mechanisms have not been investigated, since both peptides activate the VPAC receptor in mammals. We investigated which receptor mediates the anorexigenic effects of these peptides in chicks. ICV co-injection of PACAP (6-38), a PAC1 receptor antagonist, attenuated the anorexigenic effect of PACAP but not VIP. On the other hand, ICV co-injection of [D-p-Cl-Phe6, Leu17]-VIP, a VPAC receptor antagonist, did not affect the effects of both peptides. Although these results imply that the effect of VIP was not specific, a subsequent experiment demonstrated that ICV injection of anti-chicken VIP antiserum stimulated feeding and suggested that endogenous VIP inhibits feeding in the chick brain. Collectively, the data suggest that the anorexigenic mechanism of PACAP is different from that of VIP and that an undiscovered VIP receptor may be present in the chicken brain. (C) 2003 Elsevier Science Ireland Ltd. All rights reserved.
机构:
United Arab Emirates Univ, Fac Med & Hlth Sci, Dept Biochem, Al Ain 17666, U Arab EmiratesUniv Brest, Univ Europeenne Bretagne, INSERM,IFR SclnBioS 148,Fac Med & Sci Sante,CHU B, Lab Traitement Informat Med,Lab Neurophysiol,U650, F-29238 Brest 3, France
机构:
Univ Pecs, Med Sch, Dept Anat, MTA PTE PACAP Res Team, H-7624 Pecs, HungaryUniv Pecs, Med Sch, Dept Anat, MTA PTE PACAP Res Team, H-7624 Pecs, Hungary
Horvath, Gabriella
Reglodi, Dora
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Univ Pecs, Med Sch, Dept Anat, MTA PTE PACAP Res Team, H-7624 Pecs, HungaryUniv Pecs, Med Sch, Dept Anat, MTA PTE PACAP Res Team, H-7624 Pecs, Hungary
Reglodi, Dora
Fabian, Eszter
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Univ Pecs, Med Sch, Dept Anat, MTA PTE PACAP Res Team, H-7624 Pecs, HungaryUniv Pecs, Med Sch, Dept Anat, MTA PTE PACAP Res Team, H-7624 Pecs, Hungary
Fabian, Eszter
Opper, Balazs
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Univ Pecs, Med Sch, Dept Anat, MTA PTE PACAP Res Team, H-7624 Pecs, HungaryUniv Pecs, Med Sch, Dept Anat, MTA PTE PACAP Res Team, H-7624 Pecs, Hungary
机构:
Showa Univ, Dept Anat, Sch Educ, Shinagawa Ku, Tokyo 1428555, JapanToyama Univ, Lab Regulatory Biol, Grad Sch Sci & Engn, Grad Sch Innovat Life Sci, Toyama 9308555, Japan