Ladenheim EE, Knipp S. Capsaicin treatment differentially affects feeding suppression by bombesin-like peptides.
Physiol Behav 2007;
91:36-41. [PMID:
17343884 PMCID:
PMC2075355 DOI:
10.1016/j.physbeh.2007.01.014]
[Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2006] [Revised: 01/10/2007] [Accepted: 01/31/2007] [Indexed: 11/24/2022]
Abstract
Peripheral administration of bombesin (BN) and the related mammalian peptides, gastrin-releasing peptide (GRP) and neuromedin B (NMB), suppress food intake in rats. To examine whether all BN-like peptides utilize the same neural pathways to reduce feeding, rats were treated on postnatal day 2 with the injection vehicle or capsaicin, a neurotoxin that damages a subset of visceral afferent fibers. When rats reached adulthood, we compared the ability of a dose range of systemically administered BN, GRP18-27 and NMB to reduce intake of a 0.5 kcal/ml glucose solution in a short-term feeding test. Our results demonstrate that capsaicin treatment abolished or attenuated the suppression of glucose intake produced by BN and NMB but had no effect on the ability of GRP to reduce feeding. These results suggest that different neural substrates underlie the anorexic effects of peripherally administered BN-like peptides.
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