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- W1600569035 abstract "Abstract Changes in plasmalemma permeability caused by excessive Cu2+ levels were examined in cells of a freshwater alga (Nitella flexilis) using a conventional microelectrode voltage-clamp technique. A rapid Cu2+-induced increase of plasmalemma conductance starting from 5 [mu]M Cu2+ was shown. Cu2+-induced plasmalemma conductance (ClGm) was nonselective and potential-independent, resembling the conductance of nonselective ionic leakage of the plasmalemma. The K+ channel conductance was shown to be unaltered by Cu2+, and a decrease in plasmalemma Cl- channel conductance at Cu2+ concentrations above 5 [mu]M was found. The depression of Cl- channels and ClGm were time-, dosage-, and Ca2+-dependent processes, revealing a great similarity in all parameters, with Ca2+ causing the preventive effect by shifting the effective Cu2+ concentrations to higher levels. This phenomenon may be explained by the same Cu2+-modified target on the plasmalemma both for ClGm and Cl- channel depression. In addition, a reversible, inhibitory effect of Cu2+ (>10 [mu]M) on the light-stimulated H+-ATPase electrogenic pump in the plasmalemma was demonstrated. This effect was Ca2+- independent, which made it possible to distinguish it from ClGm. Therefore, the Cu2+-induced dramatic alterations in plant cell plasmalemma permeability are caused mainly by nonselective conductance increases and electrogenic pump inhibition." @default.
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- W1600569035 date "1997-08-01" @default.
- W1600569035 modified "2023-09-26" @default.
- W1600569035 title "The Effect of Cu2+ on Ion Transport Systems of the Plant Cell Plasmalemma" @default.
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- W1600569035 doi "https://doi.org/10.1104/pp.114.4.1313" @default.
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