Immunosuppressors inhibit voltage-gated potassium channels in human peripheral blood lymphocytes

György Panyi, Rezso Gáspár, Zoltán Krasznai, Jan J. Ter Horst, Marcel Ameloot, Adorján Aszalós, Paul Steels, Sándor Damjanovich

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20 Citations (Scopus)


The effects of immunosuppressive agents on the potassium current of human peripheral blood lymphocytes have been studied using the whole-cell patch-clamp technique. Cyclosporin A (10 μg/ml), rapamycin (10 μg/ml) and FK-506 (2.5 μg/ml) reduced the peak K+ current by approximately 40, 30 and 40% of the control, respectively, without any change in the reversal potential of the current. The current inhibition was similar at all membrane potentials studied and was accompanied with an increase in the rate of K+ current inactivation. Membrane potential measurements in current-clamp showed a marked depolarization of the membrane (> 10 mV) upon the addition of either immunosuppressor to the cells. Our findings revealed that the voltage-dependent potassium current in human peripheral blood lymphocytes is inhibited by Cyclosporin A and other immunosuppressors, resulting in a depolarized membrane potential.

Original languageEnglish
Pages (from-to)254-258
Number of pages5
JournalBiochemical and biophysical research communications
Issue number2
Publication statusPublished - Apr 16 1996

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology

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