Modification of the serotonergic systems and phenotypes by gestational micronutrients

Area of Science:

• Nutritional Neuroscience
• Developmental Programming
• Metabolic Health

Background:

• Excess or imbalanced maternal micronutrient intake during pregnancy can elevate offspring's metabolic disease risk.
• The underlying mechanisms, particularly the role of serotonin (5-hydroxytryptamine, 5-HT), remain unclear.

Purpose of the Study:

• To investigate how gestational micronutrient intake impacts offspring's central and peripheral serotonergic systems.
• To determine the role of these systems in modulating offspring's metabolic phenotypes.

Main Methods:

• Pregnant Wistar rats were fed diets varying in vitamin and folic acid content.
• Offspring were weaned to a high-fat diet and assessed for metabolic and serotonergic system responses.
• Central 5-HT2C receptor function was evaluated using mCPP; peripheral markers included colon 5-HT and fasting glucose.

Main Results:

• Gestational high multivitamins or folic acid altered offspring's 5-HT2C receptor responsiveness.
• Offspring exhibited increased food intake, weight gain, colon 5-HT, fasting glucose, and obesity-related body composition.
• Colon 5-HT levels strongly correlated with fasting glucose concentrations in offspring.

Conclusions:

• Gestational micronutrient composition significantly influences offspring's serotonergic systems.
• These alterations are associated with metabolic disturbances and increased obesity risk in offspring.
• The serotonergic system is a key mediator in the developmental programming of metabolic health by maternal nutrition.