Short peptides stimulate serotonin expression in cells of brain cortex

Area of Science:

• Neuroscience
• Molecular Biology
• Gerontology

Background:

• Serotonin is crucial for brain function and its synthesis declines with age.
• Aging brain cells show reduced serotonin expression, impacting cognitive and mood functions.
• Identifying novel regulators of serotonin synthesis is vital for brain health in aging.

Purpose of the Study:

• To investigate the effect of Glu-Asp-Arg and Lys-Glu-Asp peptides on serotonin expression in aging brain cortex cells.
• To elucidate the molecular mechanism by which these peptides regulate serotonin synthesis.
• To assess the potential neuroprotective and geroprotective activities of these peptides.

Main Methods:

• Primary cell cultures of aging brain cortex were used.
• Peptide treatment was applied to assess serotonin expression.
• Molecular docking simulations were performed to analyze peptide-gene interactions.
• The 5-tryptophan hydroxylase gene, crucial for serotonin synthesis, was a focus of investigation.

Main Results:

• Glu-Asp-Arg and Lys-Glu-Asp peptides significantly stimulated serotonin expression in aging brain cortex cultures.
• Molecular docking revealed that these peptides are complementary to the CCTGCC nucleotide sequence within the 5-tryptophan hydroxylase gene.
• This complementarity suggests a direct interaction and regulation of the gene encoding the key enzyme in serotonin synthesis.

Conclusions:

• Glu-Asp-Arg and Lys-Glu-Asp peptides epigenetically regulate serotonin synthesis in the brain cortex.
• These findings highlight the neuro- and geroprotective potential of these specific peptides.
• The study provides a molecular basis for using these peptides to combat age-related decline in brain serotonin levels.