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• W2039193707 startingPage "77" @default.
• W2039193707 abstract "Donepezil is a potent, selective inhibitor of acetylcholinesterase, which is used for the treatment of Alzheimer’s disease. Whole-cell patch-clamp technique and Western blot analyses were used to study the effects of donepezil on the human ether-a-go-go-related gene (hERG) channel. Donepezil inhibited the tail current of the hERG in a concentration-dependent manner with an IC50 of 1.3 μM. The metabolites of donepezil, 6-ODD and 5-ODD, inhibited the hERG currents in a similar concentration-dependent manner; the IC50 values were 1.0 and 1.5 μM, respectively. A fast drug perfusion system demonstrated that donepezil interacted with both the open and inactivated states of the hERG. A fast application of donepezil during the tail currents inhibited the open state of the hERG in a concentration-dependent manner with an IC50 of 2.7 μM. Kinetic analysis of donepezil in an open state of the hERG yielded blocking and unblocking rate constants of 0.54 µM−1s−1 and 1.82 s−1, respectively. The block of the hERG by donepezil was voltage-dependent with a steep increase across the voltage range of channel activation. Donepezil caused a reduction in the hERG channel protein trafficking to the plasma membrane at low concentration, but decreased the channel protein expression at higher concentrations. These results suggest that donepezil inhibited the hERG at a supratherapeutic concentration, and that it did so by preferentially binding to the activated (open and/or inactivated) states of the channels and by inhibiting the trafficking and expression of the hERG channel protein in the plasma membrane." @default.
• W2039193707 created "2016-06-24" @default.
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• W2039193707 date "2015-02-01" @default.
• W2039193707 modified "2023-10-10" @default.
• W2039193707 title "Effects of donepezil on hERG potassium channels" @default.
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• W2039193707 doi "https://doi.org/10.1016/j.brainres.2014.11.057" @default.
• W2039193707 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/25498859" @default.
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