title: Membrane potential in human myeloid leukemia cell line ML-1: responsiveness of granulocytic and monocytic differentiated cells.
abstract: The membrane potential responsiveness of human myeloid leukemia cells (ML-1 line) was studied with the voltage sensitive fluorescent dye diS-C3-(5). The experimental procedure used in this study enabled us to assess the magnitude of the membrane potential change in cells treated with ouabain, 12-0-tetradecanoylphorbol-13-acetate (TPA) and N-formyl-L-methionyl-L-leucyl-L-phenylalanine (FMLP), relative to the membrane potential in the untreated control. Inhibition of the Na, K-ATPase by ouabain was followed by a (20 +/- 4) mV depolarization. In undifferentiated homogeneous cell population TPA caused a (19.4 +/- 4.4) mV depolarization while FMLP had virtually no effect. Cells in which granulocytic or monocytic differentiation was induced by retinoic acid or 1,25-dihydroxyvitamin D3 exhibited under the effect of TPA a (57.8 +/- 7.1) mV and (34.8 +/- 10.9) mV depolarization, respectively. A very small transient depolarization was also observed up on treating of the cells with FMLP. The changes in the membrane potential responsiveness in the induced cells are obviously connected with the cell differentiation.
authors.affiliation: Institute of Physiology, Czechoslovak Academy of Sciences, Prague.
authors.forename: V
authors.initials: V
authors.lastname: Hrouda
authors.forename: C
authors.initials: C
authors.lastname: Haskovec
authors.forename: J
authors.initials: J
authors.lastname: Plásek
authors.forename: K
authors.initials: K
authors.lastname: Sigler
mesh_terms: D052160:Benzothiazoles; D002232:Carbocyanines / Q000494:pharmacology; D002454:Cell Differentiation / Q000187:drug effects; D005453:Fluorescence; D006098:Granulocytes / Q000502:physiology*; D006801:Humans; D007700:Kinetics; D007951:Leukemia, Myeloid; D008564:Membrane Potentials / Q000187:drug effects; D009000:Monocytes / Q000502:physiology*; D009240:N-Formylmethionine Leucyl-Phenylalanine / Q000494:pharmacology*; D010042:Ouabain / Q000494:pharmacology*; D000254:Sodium-Potassium-Exchanging ATPase / Q000037:antagonists & inhibitors / Q000187:drug effects; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology*; D014407:Tumor Cells, Cultured; D014634:Valinomycin / Q000494:pharmacology
chemical_list: D052160:Benzothiazoles; D002232:Carbocyanines; D014634:Valinomycin; C012944:3,3'-dipropyl-2,2'-thiadicarbocyanine; D009240:N-Formylmethionine Leucyl-Phenylalanine; D010042:Ouabain; D000254:Sodium-Potassium-Exchanging ATPase; D013755:Tetradecanoylphorbol Acetate