GABAergic Signaling and SST Interneurons Boost Dendritic Calcium Influx

The delicate balance between neuronal excitation and inhibition is fundamental to cortical function, with gamma-aminobutyric acid (GABA) serving as the primary inhibitory neurotransmitter [1]. Dysregulation of this system is a known contributor to a range of neurological and psychiatric conditions, including Alzheimer's disease [2, 3], major depressive disorder [4], and autism spectrum disorders [5]. While GABAergic activity is classically understood to suppress neuronal firing, the specific mechanisms by which different GABA receptor subtypes influence dendritic calcium signaling, a key process for synaptic plasticity, have remained less defined [6, 7, 8]. A recent study now challenges the conventional view of GABA's role, revealing how a specific inhibitory pathway can paradoxically amplify, rather than dampen, a critical form of dendritic activity.