The janus-activated kinase 2 JAK2 participates in the signalling of several hormones including interferon, a powerful regulator of lymphocyte function. Lymphocyte activity and survival depend on the activity of the voltage-gated K+ channel KCNA3 (Kv1.3). The present study thus explored whether JAK2 modifies the activity of voltage-gated K+ channel KCNA3. To this end, cRNA encoding KCNA3 was injected in Xenopus oocytes with or without additional injection of cRNA encoding wild-type human JAK2, human inactive K882EJAK2 mutant, or human gain-of-function V617FJAK2 mutant. KCNA3-dependent depolarization-induced current was determined utilizing dual-electrode voltage clamp, and protein KCNA3 abundance in the cell membrane was quantified by chemiluminescence. Moreover, the effect of interferon-γ on voltage-gated K+ current was determined by patch clamp in mainly KCNA3-expressing Jurkat T cells with or without prior treatment with JAK2 inhibitor AG490 (40 µM). As a result, KCNA3 channel activity and protein abundance were up-regulated by coexpression of JAK2 or V617FJAK2 but not K882EJAK2. The effect of JAK2 coexpression was reversed by AG490 treatment. In human Jurkat T lymphoma cells, voltage-gated K+ current was up-regulated by interferon-γ and down-regulated by AG490 (40 µM). In conclusion, JAK2 participates in the signalling, regulating the voltage-gated K+ channel KCNA3.
The Journal of Membrane Biology – Springer Journals
Published: Feb 3, 2015
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