Astrocyte and Neuronal Panx1 Support Long-Term Reference Memory in Mice.

Area of Science:

• Neuroscience
• Molecular Biology
• Cell Biology

Background:

• Pannexin 1 (Panx1) forms plasma membrane channels permeable to signaling molecules.
• Panx1 channel activation is linked to neurological disorders.
• Its physiological role in learning and memory is largely unexplored.

Purpose of the Study:

• To investigate the role of Panx1 in working and reference memory.
• To determine the contribution of neuronal and astrocyte Panx1 to memory formation.
• To explore the impact of Panx1 deletion on synaptic plasticity in the hippocampus.

Main Methods:

• Utilized Panx1 transgenic mice with global and cell-type specific deletions.
• Assessed spatial working and reference memory using the eight-arm radial maze.
• Performed field potential recordings in hippocampal slices to analyze synaptic plasticity (LTP/LTD).

Main Results:

• Panx1-null mice exhibited deficits in long-term spatial reference memory, but not working memory.
• Both astrocyte and neuronal Panx1 were found to contribute to memory consolidation.
• Hippocampal slices from Panx1-null mice showed attenuated long-term potentiation and depression at Schaffer collateral-CA1 synapses.

Conclusions:

• Neuronal and astrocyte Panx1 channels are essential for the development and maintenance of long-term spatial reference memory.
• Panx1 plays a significant role in activity-dependent neuron-glia interactions influencing memory.
• Panx1 channels are critical for hippocampal synaptic plasticity underlying spatial memory.