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

Quinidine normalizes the open duration of slow-channel mutants of the acetylcholine receptor.

Quinidine is a long-lived open-channel blocker of the wild-type endplate acetylcholine receptor (AChR). To test the hypothesis that quinidine can normalize the prolonged channel opening events of slow-channel mutants of human AChR, we expressed wild-type AChR and five well characterized slow-channel mutants of AChR in HEK 293 cells and monitored the effects of quinidine on acetylcholine-induced channel currents. Quinidine shortens the longest component of channel opening burst (tau3b) of both wild-type and mutant AChRs in a concentration-dependent manner, and 5 microM quinidine reduces tau3b of the mutant AChRs to that of wild-type AChRs in the absence of quinidine. Because this concentration of quinidine is attainable in clinical practice, the findings predict a therapeutic effect for quinidine in the slow-channel congenital myasthenic syndrome.[1]

References

  1. Quinidine normalizes the open duration of slow-channel mutants of the acetylcholine receptor. Fukudome, T., Ohno, K., Brengman, J.M., Engel, A.G. Neuroreport (1998) [Pubmed]
 
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