Parvalbumin cell state dynamics regulate gamma oscillations and are disrupted in Alzheimer's disease.

Dynamic transitions between parvalbumin interneuron states are essential for gamma oscillations and are disrupted in J20 Alzheimer's disease mice.

• Why it matters: Gamma oscillations are crucial for cognitive processing, yet the cellular and circuit mechanisms underlying their generation are not well understood, especially in disease states.
• What they did: Using simultaneous calcium imaging and electrocorticography in awake mice, the study examined PV interneuron activity, revealing sequential recruitment, transient inactivation, and frequent state transitions, with these dynamics becoming dysregulated in Alzheimer's model mice.
• The result: Restoring PV cell excitability via Nav1.1 expression reestablished PV cell dynamics, gamma oscillations, and network stability, suggesting that disruption of PV cell states contributes to network dysfunction in Alzheimer's disease.