Potassium voltage-gated channel subfamily KQT member (Kv7) (Kv7)

Kv7 channels, encoded by the KCNQ gene family (specifically KCNQ2-5 in the nervous system), are voltage-gated potassium channels that generate the M-current, a slow-activating and non-inactivating current that plays a dominant role in regulating neuronal excitability (Brown & Passmore, 2009, PMID: 19706374). In sensory neurons, such as those in the dorsal root ganglia, these channels act as a physiological brake by stabilizing the resting membrane potential and increasing the threshold for action potential generation (Du & Gamper, 2013, PMID: 23536567). Dysfunction or downregulation of Kv7 channels leads to neuronal hyperexcitability, which is a primary driver of chronic and neuropathic pain states (Nielsen et al., 2015, PMID: 25634234). Pharmacological activators, or openers, of Kv7 channels like retigabine and the investigational drug XEN1101 enhance this inhibitory current to suppress pathological firing in hyperexcitable neurons (Gunthorpe et al., 2012, PMID: 22300831). While highly effective in preclinical models of pain and epilepsy, the clinical utility of first-generation Kv7 openers has been limited by off-target effects such as urinary retention and tissue discoloration, driving the development of more subunit-selective modulators (Miceli et al., 2018, PMID: 29434311).

Other names

KCNQ channelsM-channelVoltage-gated potassium channel subunit Kv7KQT-like carbonyl-terminal protein

Positive allosteric modulation (channel opening) to stabilize membrane potential and reduce neuronal firing frequency.