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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Voltage-activated calcium channel currents of rat dorsal root ganglion cells are reduced by trimethyl lead.

Using the conventional whole-cell patch-clamp recording technique with cultured neurones of rat dorsal root ganglions (DRG), we analysed the effects of trimethyl lead (TML) on voltage-activated calcium channel currents. TML reduces voltage-activated calcium channel currents in a dose-dependent manner, with a threshold concentration below 0.5 microM and a total reduction of the current ( > or =80% of the control current) at concentrations above 50 microM. Half of the current is abolished at TML concentrations between 1 and 5 microM. The action is irreversible and is not voltage dependent. After application of TML the current decreases with each activation of the channel until a steady state is reached after 8-12 min, when the channel was activated every 10 s. The channel had to be in the open state for TML to act. TML is a potent compound for reducing voltage activated calcium channel currents. These effects of TML must be taken into account in explaining the neurotoxic effects of this organic metal compound.[1]


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