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Elevation of a potassium current in differentiating human leukemic (HL-60) cells

✍ Scribed by Steven J. Wieland; Robin H. Chou; Thelma A. Chen


Publisher
John Wiley and Sons
Year
1987
Tongue
English
Weight
432 KB
Volume
132
Category
Article
ISSN
0021-9541

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✦ Synopsis


Human promyelocytic leukemia (HL-60) cells display a novel voltage-dependent outward current under voltage clamp. This current is present at low levels in the proliferative state and in granulocytes derived from HL-60 cells which were induced to differentiate with retinoic acid. It is elevated in macrophages derived from HL-60 cells after exposure to phorbol-12-myristate-13acetate (PMA). The current is carried primarily by K + , is blocked by Cs+ and by increased intracellular concentrations of CI-. From a holding potential of -80 mV, significant activation required depolarization to + 20 mV membrane


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