Kv1.3 belongs to the Shaker family of voltage-dependent K+ channels.
The channel is widely expressed in the brain, lung and osteoclasts and in several cell
populations of hematopoietic origin. It is in these cells (particularly T lymphocytes) that
Kv1.3 function has centered a lot of attention. It was found that Kv1.3 is the main channel
responsible for maintaining the resting potential in quiescent cells and regulating the
Ca2+ signaling that is indispensable for normal T lymphocyte activation.1,2
Based on the central role of Kv1.3 in regulating the initiation of an immune response,
the channel has been recognized as a potential target for immunosuppressant drugs.1
KV1.3 channels are potently inhibited by several venomous peptide toxins among them
Charybdotoxin (#RTC-325, 2.6nM), Noxiustoxin (#RTN-340, 1nM), Kaliotoxin (#RTK-370, 0.65nM),
Margatoxin (#RTM-325, 0.05nM), Agitoxin-1 (#RTA-150, 1.7nM), Agitoxin-2 (#RTA-420, 0.004nM),
Hongotoxin-1 (#RTH-400, 0.09nM) and Stichodactyla toxin (#S-400, 0.01nM).3-7