K_V3.1 channel modulation: a systematic review of pharmacological intervention strategies

Voltage-gated potassium channels of the K_V3 subfamily, particularly K_V3.1 (encoded by KCNC1), are essential regulators of fast-spiking inhibitory interneuron activity and high-frequency neuronal firing, enabling precise control of neuronal excitability and network synchrony. Growing evidence links K_V3.1 dysfunction to epilepsy, schizophrenia, tinnitus, fragile X syndrome, amyotrophic lateral sclerosis, and KCNC1 related developmental and epileptic encephalopathies, positioning this channel as a promising therapeutic target.

This systematic review, conducted in accordance with PRISMA guidelines, evaluates original studies published between 2016 and January 2026 that investigated pharmacological modulation of K_V3.1 using in vitro, in vivo, structural, and translational approaches.

A total of thirty-two studies met the predefined PICOS criteria. The literature reveals two pharmacological strategies: positive allosteric modulation aimed at enhancing fast-spiking inhibitory interneuron function and restoring excitation inhibition balance, and state-dependent channel inhibition, particularly relevant for pathogenic gain of function KCNC1 variants.

While early positive allosteric modulators demonstrated proof of mechanism with limited clinical success, second-generation compounds exhibit improved translational potential, including evidence that they modulate functional brain networks in humans. In parallel, clinically approved antidepressants have been identified as open-channel blockers of K_V3.1, enabling mutation-specific therapeutic repurposing.

Collectively, these findings highlight K_V3.1 modulation as a context-dependent and increasingly precise pharmacological strategy for neurological and neurodevelopmental disorders.