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

The Potassium voltage-gated channel subfamily A member 3 (Kv1.3) is a transmembrane protein that facilitates the efflux of potassium ions in response to changes in cell membrane potential (UniProt P22001) [1]. It is a critical regulator of immune function, particularly in the activation and proliferation of effector memory T cells (TEM) (PubMed: 12519788) [2]. In these cells, Kv1.3 provides the electrical driving force necessary for sustained calcium entry, which triggers cytokine production and inflammatory responses. Due to its specific overexpression on pathogenic TEM cells in various autoimmune conditions, such as multiple sclerosis and rheumatoid arthritis, Kv1.3 is a high-priority therapeutic target (PubMed: 22891913) [5]. Inhibiting this channel allows for the selective suppression of disease-associated T cells while leaving naive and central memory T cell responses largely intact. Current drug development efforts focus on peptide toxins like dalazatide and small molecules like PAP-1 to achieve high selectivity (PubMed: 27931384) [4]. Beyond the immune system, Kv1.3 is also expressed in the olfactory bulb and has been implicated in metabolic regulation and neuroinflammatory processes in the brain.

Other names

KCNA3HGK5HLK3HPCN3Voltage-gated potassium channel 1.3PCN3

Selective blockade of the Kv1.3 channel pore inhibits the efflux of potassium ions, leading to membrane depolarization. This depolarization reduces the electrochemical gradient for calcium entry through ORAI1 channels, thereby preventing the sustained calcium signaling required for calcineurin activation and the subsequent production of pro-inflammatory cytokines in effector memory T cells (PubMed: 19412165) [3].