Potassium voltage-gated channel subfamily Q (KCNQ) (KCNQ)

KCNQ channels, specifically the Kv7.2 through Kv7.5 subtypes, are essential regulators of neuronal excitability within the peripheral nervous system, particularly in dorsal root ganglion (DRG) sensory neurons. These channels generate the M-current, a slow-activating and non-inactivating potassium current that serves as a physiological brake to prevent repetitive action potential firing and maintain the resting membrane potential. In peripheral sensory neurons, KCNQ channels play a pivotal role in nociception; their downregulation or inhibition leads to neuronal hyperexcitability, which is a hallmark of chronic and neuropathic pain. Pharmacological activation of these channels using positive allosteric modulators effectively hyperpolarizes the neuron, raising the threshold for firing and providing a potent mechanism for analgesia. Consequently, KCNQ channels are high-priority targets for developing non-opioid treatments for various pain syndromes and hyperexcitability disorders.

Other names

Kv7 channelM-channelVoltage-gated potassium channel subunit Kv7KQT-like subfamily

Positive allosteric modulation of KCNQ channels to stabilize the open state and shift the voltage-dependence of activation to more hyperpolarized potentials, thereby reducing neuronal firing.