Abstract | BACKGROUND AND PURPOSE:
Methylamine is an endogenous aliphatic amine exhibiting anorexigenic properties in mice. The aim of this work was to show whether methylamine also modifies feeding behaviour in rats and, if so, to identify the mediator(s) responsible for such effects. EXPERIMENTAL APPROACH: Microdialysis experiments with the probe inserted in the periventricular hypothalamic nucleus were carried out in 12 h starved, freely moving rats. Collected perfusate samples following methylamine injection (i.c.v.) were analysed for nitric oxide by chemiluminescence and for dopamine and 5-hydroxytryptamine content by HPLC. Kv1.6 potassium channel expression was reduced by antisense strategy and this decrease quantified by semi-quantitative RT-PCR analysis. KEY RESULTS: CONCLUSIONS AND IMPLICATIONS: The effects of methylamine on feeding depend on the hypothalamic release of nitric oxide and dopamine as a result of interaction at the Kv1.6 channels. The study of methylamine levels in the CNS may provide new perspectives on the physiopathology of alimentary behaviour.
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Authors | L Raimondi, C Alfarano, A Pacini, S Livi, C Ghelardini, G DeSiena, R Pirisino |
Journal | British journal of pharmacology
(Br J Pharmacol)
Vol. 150
Issue 8
Pg. 1003-10
(Apr 2007)
ISSN: 0007-1188 [Print] England |
PMID | 17339841
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- Appetite Depressants
- Enzyme Inhibitors
- Kcna6 protein, rat
- Kv1.6 Potassium Channel
- Methylamines
- Oligonucleotides, Antisense
- Nitric Oxide
- Serotonin
- alpha-Methyltyrosine
- methylamine
- Nitric Oxide Synthase
- Tyrosine 3-Monooxygenase
- NG-Nitroarginine Methyl Ester
- Dopamine
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Topics |
- Animals
- Appetite Depressants
(administration & dosage, metabolism)
- Appetite Regulation
(drug effects)
- Dopamine
(metabolism)
- Dose-Response Relationship, Drug
- Enzyme Inhibitors
(pharmacology)
- Fasting
- Hyperphagia
(metabolism, physiopathology)
- Hypothalamus
(drug effects, metabolism)
- Injections, Intraventricular
- Kv1.6 Potassium Channel
(drug effects, genetics, metabolism)
- Male
- Methylamines
(administration & dosage, metabolism)
- Microdialysis
- NG-Nitroarginine Methyl Ester
(pharmacology)
- Nitric Oxide
(metabolism)
- Nitric Oxide Synthase
(antagonists & inhibitors, metabolism)
- Oligonucleotides, Antisense
(genetics, metabolism)
- Rats
- Rats, Wistar
- Serotonin
(metabolism)
- Time Factors
- Tyrosine 3-Monooxygenase
(antagonists & inhibitors, metabolism)
- alpha-Methyltyrosine
(pharmacology)
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