Title : Allosteric effects of erythromycin pretreatment on thioridazine block of hERG potassium channels.

Pub. Date : 2014 Apr

PMID : 24417241






8 Functional Relationships(s)
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1 Allosteric effects of erythromycin pretreatment on thioridazine block of hERG potassium channels. Erythromycin ETS transcription factor ERG Homo sapiens
2 Experiments were conducted to determine if concomitant exposure to two potent pore hERG blockers, thioridazine and terfenadine and a weak hERG blocker, erythromycin, would result in an additive, synergistic or inhibitory effect. Erythromycin ETS transcription factor ERG Homo sapiens
3 KEY RESULTS: Pre-exposure of cells to erythromycin resulted in an approximately 14-22-fold rightward shift in the hERG concentration-response curve for thioridazine and terfenadine respectively. Erythromycin ETS transcription factor ERG Homo sapiens
4 CONCLUSIONS AND IMPLICATIONS: Pretreatment with erythromycin induced an approximately 14-22-fold reduction in hERG affinity for pore-binding drugs at concentrations of erythromycin, which by themselves only block hERG by 10% or less. Erythromycin ETS transcription factor ERG Homo sapiens
5 CONCLUSIONS AND IMPLICATIONS: Pretreatment with erythromycin induced an approximately 14-22-fold reduction in hERG affinity for pore-binding drugs at concentrations of erythromycin, which by themselves only block hERG by 10% or less. Erythromycin ETS transcription factor ERG Homo sapiens
6 CONCLUSIONS AND IMPLICATIONS: Pretreatment with erythromycin induced an approximately 14-22-fold reduction in hERG affinity for pore-binding drugs at concentrations of erythromycin, which by themselves only block hERG by 10% or less. Erythromycin ETS transcription factor ERG Homo sapiens
7 CONCLUSIONS AND IMPLICATIONS: Pretreatment with erythromycin induced an approximately 14-22-fold reduction in hERG affinity for pore-binding drugs at concentrations of erythromycin, which by themselves only block hERG by 10% or less. Erythromycin ETS transcription factor ERG Homo sapiens
8 Furthermore, these results suggest that co-administration of erythromycin may provide some reduction in cardiac liability of potent hERG-blocking drugs. Erythromycin ETS transcription factor ERG Homo sapiens