miR-124 dosage regulates prefrontal cortex function by dopaminergic modulation.

Area of Science:

• Neuroscience
• Molecular Biology
• Genetics

Background:

• MicroRNA-124 (miR-124) is abundant in the central nervous system (CNS) and crucial for its development.
• Its role in normal brain function remains largely unexplored.

Purpose of the Study:

• To investigate the function of miR-124 in normal brain function using a mouse model.
• To elucidate the molecular mechanisms underlying miR-124's role in the prefrontal cortex (PFC).

Main Methods:

• Comprehensive behavioral analysis of miR-124-1+/- mice.
• Electrophysiological recordings in PFC slices.
• Gene expression analysis of dopaminergic system components and glucocorticoid receptor.

Main Results:

• miR-124-1+/- mice exhibited deficits in prepulse inhibition, social behavior, and increased hyperactivity.
• Enhanced synaptic transmission was observed in PFC pyramidal cells of miR-124-1+/- mice.
• Aberrant dopamine receptor D2 (Drd2) signaling and increased Nr3c1 expression were identified as key molecular changes.

Conclusions:

• miR-124 dosage is critical for regulating PFC function.
• miR-124 modulates PFC function by repressing the Drd2 pathway.
• These findings highlight miR-124's essential role in maintaining normal brain function.