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Dynamic assemblies of parvalbumin interneurons in brain oscillations
Yi-Chieh Huang1, Hui-Ching Chen1, Yu-Ting Lin1
1Institute of Neuroscience, National Yang Ming Chiao Tung University, Taipei 112, Taiwan.
Neuron
|July 2, 2024
Summary
Parvalbumin-expressing interneurons form dynamic cell assemblies that generate brain rhythms. These assemblies rapidly change membership, coordinating neural activity for cognitive functions.
Area of Science:
- Neuroscience
- Computational Neuroscience
- Systems Neuroscience
Background:
- Brain oscillations are vital for cognitive functions like perception and memory.
- Parvalbumin-expressing (PV) interneurons are key players in generating these neural rhythms.
- The population dynamics of PV interneurons during oscillations are not well understood.
Purpose of the Study:
- To investigate the population dynamics of PV interneurons during hippocampal ripple oscillations in vivo.
- To understand how PV interneurons contribute to the generation and dynamics of brain rhythms.
Main Methods:
- Simultaneous in vivo voltage imaging of membrane potentials in up to 26 PV interneurons in mice.
- Analysis of neural activity during hippocampal ripple oscillations.
Main Results:
- PV interneurons form highly dynamic cell assemblies that generate ripple-frequency rhythms.
- Assembly size and membership change rapidly and significantly from cycle to cycle.
- Neuronal activity is coordinated, with other PV cells' activity predicting individual cell spiking, even at subthreshold levels and without network oscillations.
Conclusions:
- Dynamic cell assemblies of PV interneurons offer a novel mechanism for flexible and rapid modulation of neural activity.
- This interneuron coordination may significantly impact cognitive functions through dynamic postsynaptic modulation.
