Using flow cytometric membrane potential measurements with the oxonol dye, we determined that 5.7-57 μM juglone depolarizes human lymphocytes in a dose dependent manner. The depolarizing effect of juglone was verified by patch-clamp. Juglone decreased whole-cell n-type K+ currents in human peripheral blood lymphocytes and accelerated inactivation; however, it did not influence the kinetics of activation of the K+ conductance. The percentage increase in K+ channel inactivation rate and the degree of drug induced block was independent of membrane potential. K+ channel block by jugalone fully developed within 4 minutes and was not removable by washing with drug free extracellular solution. Blocking of n-type K+ channels by juglone is in concert with its depolarizing effect on human lymphocytes.
|Number of pages||5|
|Journal||Biochemical and biophysical research communications|
|Publication status||Published - Jan 26 1996|
ASJC Scopus subject areas
- Molecular Biology
- Cell Biology