Toward Understanding the Diverse Roles of Perisomatic Interneurons in Epilepsy

Abstract

Epileptic seizures are associated with excessive neuronal spiking. Perisomatic γ-aminobutyric acid (GABA)ergic interneurons specifically innervate the subcellular domains of postsynaptic excitatory cells that are critical for spike generation. With a revolution in transcriptomics-based cell taxonomy driving the development of novel transgenic mouse lines, selectively monitoring and modulating previously elusive interneuron types is becoming increasingly feasible. Emerging evidence suggests that the three types of hippocampal perisomatic interneurons, axo-axonic cells, along with parvalbumin- and cholecystokinin-expressing basket cells, each follow unique activity patterns in vivo, suggesting distinctive roles in regulating epileptic networks.

Keywords: CB1; GABA; axo-axonic cells; basket cells; cannabinoid; cholecystokinin; epilepsy; hippocampus; inhibition; interneuron; parvalbumin; perisomatic; temporal lobe epilepsy.