Kv1.3 potassium voltage-gated channel subfamily A member 3 (Kv1.3)

Kv1.3 potassium voltage-gated channel subfamily A member 3 is a tetrameric ion channel found primarily on immune cells, such as T lymphocytes and microglia. Structurally, each subunit contains six transmembrane segments with distinct voltage-sensing and ion-conducting domains, featuring a highly conserved selectivity filter that discriminates potassium from sodium ions. Kv1.3 channels regulate the membrane potential and calcium-dependent signaling pathways crucial for immune cell activation and proliferation. Functionally, they are integral to immune responses, and their upregulation is notable in several autoimmune and neuroinflammatory conditions. Kv1.3 blockade is being explored as an immunosuppressive therapeutic strategy in the treatment of these diseases. Despite promise, systemic inhibition may pose immunosuppressive risks and off-target effects due to the channel's broader expression profile. The molecular characterization and strong evidence linking Kv1.3 to disease pathology establish it as a significant drug target.

Other names

Kv1.3KCNA3Shaker-related potassium channelvoltage-gated potassium channel subfamily A member 3

Channel blockade (inhibition of potassium efflux, leading to altered membrane potential and suppressed T cell activation); Stabilization of channel selectivity filter (peptides/nanobodies can lock the channel in a non-conducting or open state); Immunosuppression by impairing calcium signaling in effector T cells