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The Journal of Immunology, Vol 158, Issue 11 5120-5128, Copyright © 1997 by American Association of Immunologists

ARTICLES

Blockade of the voltage-gated potassium channel Kv1.3 inhibits immune responses in vivo

GC Koo, JT Blake, A Talento, M Nguyen, S Lin, A Sirotina, K Shah, K Mulvany, D Hora Jr, P Cunningham, DL Wunderler, OB McManus, R Slaughter, R Bugianesi, J Felix, M Garcia, J Williamson, G Kaczorowski, NH Sigal, MS Springer and W Feeney
Department of Immunology Research, Merck Research Laboratories, Merck and Co., Rahway, NJ 07065, USA.

The voltage activated K+ channel (Kv1.3) has recently been identified as the molecule that sets the resting membrane potential of peripheral human T lymphoid cells. In vitro studies indicate that blockage of Kv1.3 inhibits T cell activation, suggesting that Kv1.3 may be a target for immunosuppression. However, despite the in vitro evidence, there has been no in vivo demonstration that blockade of Kv1.3 will attenuate an immune response. The difficulty is due to species differences, as the channel does not set the membrane potential in rodent peripheral T cells. In this study, we show that the channel is present on peripheral T cells of miniswine. Using the peptidyl Kv1.3 inhibitor, margatoxin, we demonstrate that Kv1.3 also regulates the resting membrane potential, and that blockade of Kv1.3 inhibits, in vivo, both a delayed- type hypersensitivity reaction and an Ab response to an allogeneic challenge. In addition, prolonged Kv1.3 blockade causes reduced thymic cellularity and inhibits the thymic development of T cell subsets. These results provide in vivo evidence that Kv1.3 is a novel target for immunomodulation.


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