Prenatal protein malnutrition decreases KCNJ3 and 2DG activity in rat prefrontal cortex

Area of Science:

• Neuroscience
• Developmental Biology
• Nutritional Science

Background:

• Prenatal protein malnutrition (PPM) in rats induces persistent alterations in cognitive functions, including increased cognitive rigidity and diminished inhibitory control.
• Gene expression analysis in the prefrontal cortex (PFC) of PPM rats indicated changes in KCNJ3 (GIRK1/Kir3.1), a gene crucial for neuronal excitability.

Purpose of the Study:

• To investigate the enduring effects of prenatal protein malnutrition on KCNJ3 gene expression and regional brain activity in the rat prefrontal cortex.
• To determine if the observed changes are localized to the PFC or if they affect other brain regions.

Main Methods:

• Gene expression analysis using polymerase chain reaction and Western blot to quantify KCNJ3 levels in different brain regions (PFC, hippocampus, brainstem).
• Assessment of baseline regional brain metabolic activity using (14)C-2-deoxyglucose autoradiography.

Main Results:

• Decreased KCNJ3 gene and protein expression were observed specifically in the PFC of PPM rats.
• Reduced baseline metabolic activity, indicative of decreased neuronal activation, was found in the PFC but not in the hippocampus.
• These effects on KCNJ3 expression and brain activity persisted into adulthood.

Conclusions:

• The prefrontal cortex (PFC) exhibits unique vulnerability to prenatal protein malnutrition during early development.
• PPM results in enduring alterations in KCNJ3 expression and baseline metabolic activity within the PFC, contributing to long-term behavioral changes.