The effect of tryptophan administration on ileum contractility and oxidant status in mice

L-tryptophan (TRP) is the precursor amino acid for the synthesis of serotonin (5-HT). 5-HT is effective both on the food intake and gastrointestinal system contractility. The aim of this study was to search the effects of systemic TRP treatment on 5-HT levels of ileum and searching the effect of ile...

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Bibliographic Details
Published in:Amino acids 2007-04, Vol.32 (3), p.453-458
Main Authors: Ozer, C, Gönül, B, Ercan, Z S, Take, G, Erdoğan, D
Format: Article
Language:English
Subjects:
Acetylcholine - pharmacology
Amino acids
Animals
Antidepressive Agents, Second-Generation - administration & dosage
Body weight
Cholinergic Agents - pharmacology
Diet
Eating - drug effects
Glutathione - metabolism
Ileum - metabolism
Male
Malondialdehyde
Malondialdehyde - metabolism
Mice
Muscle Contraction - drug effects
Organ Culture Techniques
Oxidants
Oxidative Stress - drug effects
Oxidizing agents
Rodents
Searching
Serotonin - biosynthesis
Synthesis
Tryptophan - administration & dosage
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Summary:L-tryptophan (TRP) is the precursor amino acid for the synthesis of serotonin (5-HT). 5-HT is effective both on the food intake and gastrointestinal system contractility. The aim of this study was to search the effects of systemic TRP treatment on 5-HT levels of ileum and searching the effect of ileal contractility and oxidant status. Swiss-albino mice were divided into two groups: 1. Control, 2. TRP-treated (100 mg/kg/24 h, i.p., for 7 days). Body weights were recorded at the beginning and at the end of experiments. Acetylcholine-induced contractile responses in the isolated ileum were recorded on polygraph. Ileal tissue malondialdehyde and glutathione levels determined by spectrophotometric and ileal tissue 5-HT levels were measured by immunohistochemical methods. TRP treatment decreased body weight and increased ileal contractile response. In the TRP-treated group, ileum malondialdehyde levels increased and glutathione levels decreased. Immunohistochemical detection showed that ileal 5-HT levels were increased by TRP treatment. There is a relationship between increased oxidative stress and increased contractility in the ileal tissue of the TRP-treated animals. These effects may be related to increased ileal 5-HT synthesis.
ISSN:0939-4451
1438-2199
DOI:10.1007/s00726-006-0339-5