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Decrease in the levels of NGF and BDNF in brains of mice fed a tryptophan-deficient diet
Bioscience, Biotechnology, and Biochemistry
|April 8, 1999
Summary
Dietary tryptophan (Trp) impacts brain neurotrophin levels. A Trp-deficient diet reduced nerve growth factor (NGF) in the hippocampus and brain-derived neurotrophic factor (BDNF) in the cerebral cortex in mice.
Area of Science:
- Neuroscience
- Nutritional Science
- Molecular Biology
Background:
- Neurotrophins like nerve growth factor (NGF), brain-derived neurotrophic factor (BDNF), and neurotrophin (NT)-3 are crucial for neuronal survival, growth, and function.
- Dietary components play a significant role in regulating brain function and neurochemical balance.
Purpose of the Study:
- To investigate the regulatory role of dietary tryptophan (Trp) on the production of NGF, BDNF, and NT-3 in specific brain regions of ddY mice.
- To determine the impact of tryptophan deficiency and excess on neurotrophin levels.
Main Methods:
- ddY mice were fed diets with varying tryptophan levels (deficient, adequate, excess) for two weeks.
- Levels of NGF, BDNF, and NT-3 were measured in different brain regions, including the hippocampus, cerebral cortex, entorhinal cortex, and septum.
Main Results:
- A tryptophan-deficient diet significantly decreased hippocampal NGF levels and cerebral cortex BDNF levels compared to an adequate tryptophan diet.
- No significant changes in NT-3 levels were observed in the hippocampus or cerebral cortex under tryptophan deficiency.
- Neither tryptophan deficiency nor excess significantly affected neurotrophin levels in the entorhinal cortex or septum.
Conclusions:
- Brain levels of NGF and BDNF are demonstrably dependent on the dietary intake of tryptophan.
- Dietary tryptophan plays a specific role in regulating certain neurotrophins in distinct brain regions, highlighting the importance of nutrition in brain health.