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• W2899671967 endingPage "1161" @default.
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• W2899671967 abstract "Two-pore channels (TPCs) are Ca2+-permeable ion channels localised to the endo-lysosomal system where they regulate trafficking of various cargoes including viruses. As a result, TPCs are emerging as important drug targets. However, their pharmacology is ill-defined. There are no approved drugs to target them. And their mechanism of ligand activation is largely unknown. Here, we identify a number of FDA-approved drugs as TPC pore blockers. Using a model of the pore of human TPC2 based on recent structures of mammalian TPCs, we virtually screened a database of ~1500 approved drugs. Because TPCs have recently emerged as novel host factors for Ebola virus entry, we reasoned that Ebola virus entry inhibitors may exert their effects through inhibition of TPCs. Cross-referencing hits from the TPC virtual screen with two recent high throughput anti-Ebola screens yielded approved drugs targeting dopamine and estrogen receptors as common hits. These compounds inhibited endogenous NAADP-evoked Ca2+ release from sea urchin egg homogenates, NAADP-mediated channel activity of TPC2 re-routed to the plasma membrane, and PI(3,5)P2-mediated channel activity of TPC2 expressed in enlarged lysosomes. Mechanistically, single channel analyses showed that the drugs reduced mean open time consistent with a direct action on the pore. Functionally, drug potency in blocking TPC2 activity correlated with inhibition of Ebola virus-like particle entry. Our results expand TPC pharmacology through the identification of approved drugs as novel blockers, support a role for TPCs in Ebola virus entry, and provide insight into the mechanisms underlying channel regulation. This article is part of a Special Issue entitled: ECS Meeting edited by Claus Heizmann, Joachim Krebs and Jacques Haiech." @default.
• W2899671967 created "2018-11-16" @default.
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• W2899671967 date "2019-07-01" @default.
• W2899671967 modified "2023-10-12" @default.
• W2899671967 title "Mining of Ebola virus entry inhibitors identifies approved drugs as two-pore channel pore blockers" @default.
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• W2899671967 doi "https://doi.org/10.1016/j.bbamcr.2018.10.022" @default.
• W2899671967 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7114365" @default.
• W2899671967 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30408544" @default.
• W2899671967 hasPublicationYear "2019" @default.
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