Parvalbumin neurons and perineuronal nets in the mouse prefrontal cortex

Area of Science:

• Neuroscience
• Developmental Biology
• Cellular Biology

Background:

• The prefrontal cortex (PFC) is crucial for cognitive functions like memory and attention.
• Alterations in parvalbumin interneurons (PV neurons) and perineuronal nets (PNNs) are linked to schizophrenia and autism spectrum disorder.
• The specific reasons for PV neuron and PNN impairment in the PFC remain unclear.

Purpose of the Study:

• To investigate whether PV neurons and PNNs exhibit region-specific characteristics within the PFC.
• To understand the developmental and mature features of PV neurons and PNNs in the PFC.

Main Methods:

• Comparative analysis of PV neuron and PNN distribution and characteristics in different PFC regions.
• Assessment of PV protein expression levels in the mature PFC.
• Examination of PNN structure and composition, including major components and tenascin-R, in the mature PFC.

Main Results:

• PV neurons and PNNs demonstrated a region-specific increase during postnatal PFC development.
• Mature PFC exhibited lower PV protein expression compared to other cortical areas.
• PNNs in the mature PFC displayed atypical, non-lattice structures lacking key components like tenascin-R.

Conclusions:

• PV neurons and PNNs possess distinct region-specific features within the prefrontal cortex.
• The unique structural properties of PFC PV neurons and PNNs suggest a potential vulnerability.
• These findings offer insights into the neuropathology of disorders affecting the PFC.