Microglial G i -dependent dynamics regulate brain network hyperexcitability

Microglial surveillance is a key feature of brain physiology and disease. Here, we found that G i -dependent microglial dynamics prevent neuronal network hyperexcitability. By generating Mg PTX mice to genetically inhibit G i in microglia, we show that sustained reduction of microglia brain surveillance and directed process motility induced spontaneous seizures and increased hypersynchrony after physiologically evoked neuronal activity in awake adult mice. Thus, G i -dependent microglia dynamics may prevent hyperexcitability in neurological diseases.