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• W2022276053 abstract "Several metal ions are known to cause depolymerization of the actin cytoskeleton under some circumstances. We found that in renal mesangial and vascular smooth muscle cells, micromolar concentrations of Cd2+ result in loss of phalloidin-stainable filamentous (F-) actin. The decrease in F-actin was not accompanied by a corresponding increase in G-actin. The decrease in total actin could be accounted for in part by an inhibition by Cd2+ of total protein (and actin) synthesis after 6 to 8 h without an effect on actin degradation, and the equilibrium between F- and G-actin was shifted to maintain near-constant levels of G-actin. However, Cd2+ caused significant decreases in F-actin at earlier times, indicating effects on the polymerization equilibrium independent of those on actin synthesis. Only picomolar concentrations of free intracellular Cd2+ occur in these experiments. However, it is this Cd2+ pool which is responsible for F-actin depolymerization because equal cellular concentrations of cadmium delivered as Cd-metallothionein have no effect. The effect is also very specific for Cd2+ and under the same conditions neither Mg2+, Mn2+, Co2+, Ni2+, Cu2+, Zn2+, nor Hg2+ result in any loss of F-actin. Addition of Cd2+ to mesangial and vascular smooth muscle cells had no immediate effect on free intracellular calcium concentrations ([Ca2+]i) even though Ca2+-signalling pathways were intact as shown with vasopressin and endothelin. Exposure to 10 μM CdCl2 for 8 h nevertheless caused an increase in [Ca2+]i to > 250 nM and increases in [Ca2+]i achieved with ionophores alone were sufficient to decrease F-actin concentrations. However, a rise in [Ca2+]i is not necessary for actin depolymerization. Depletion of cellular Ca2+ by treatment with thapsigargin did not protect F-actin against Cd2+; the effect of Cd2+ was enhanced in cells unable to increase their [Ca2+]i. We conclude that depolymerization of F-actin by Cd2+ in smooth muscle and mesangial cells is metal-specific, Ca2+-independent, and accompanied by a depletion of total actin protein. © 1996 Wiley-Liss, Inc." @default.
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• W2022276053 date "1996-01-01" @default.
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• W2022276053 title "Calcium-independent effects of cadmium on actin assembly in mesangial and vascular smooth muscle cells" @default.
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• W2022276053 doi "https://doi.org/10.1002/(sici)1097-0169(1996)33:3<208::aid-cm5>3.0.co;2-6" @default.
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