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• W2788752482 endingPage "1059" @default.
• W2788752482 startingPage "1047" @default.
• W2788752482 abstract "Although peptides, antibodies/antibody fragments, siRNAs, antisense DNAs, enzymes, and aptamers are all under development as possible therapeutic agents, the breadth of their applications has been severely compromised by their inability to reach intracellular targets. Thus, while macromolecules can often enter cells by receptor-mediated endocytosis, their missions frequently fail due to an inability to escape their entrapping endosomes. In this paper, we describe a general method for promoting release of any biologic material from any entrapping endosome. The strategy relies on the fact that all nascent endosomes contain extracellular (Na+-enriched) medium, but are surrounded by intracellular (K+-enriched) fluid in the cytoplasm. Osmotic swelling and rupture of endosomes will therefore be facilitated if the flow of K+ down its concentration gradient from the cytosol into the endosome can be facilitated without allowing downhill flow of Na+ from the endosome into the cytosol. While any K+ selective ionophore can promote the K+ specific influx, the ideal K+ ionophore will also exchange influxed K+ for an osmotically inactive proton (H+) in order to prevent buildup of an electrical potential that would rapidly halt K+ influx. The only ionophore that catalyzes this exchange of K+ for H+ efficiently is nigericin. We demonstrate here that ligand-targeted delivery of nigericin into endosomes that contain an otherwise impermeable fluorescent dye can augment release of the dye into the cell cytosol via swelling/bursting of the entrapping endosomes. We further show that nigericin-facilitated escape of a folate-targeted luciferase siRNA conjugate from its entrapping endosomes promotes rapid suppression of the intended luciferase reporter gene. Taken together, we propose that ionophore-catalyzed entry of K+ into endosomal compartments can promote the release of otherwise impermeable contents from their encapsulating endosomes." @default.
• W2788752482 created "2018-03-06" @default.
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• W2788752482 date "2018-02-15" @default.
• W2788752482 modified "2023-10-16" @default.
• W2788752482 title "New Mechanism for Release of Endosomal Contents: Osmotic Lysis via Nigericin-Mediated K⁺/H⁺ Exchange" @default.
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• W2788752482 doi "https://doi.org/10.1021/acs.bioconjchem.7b00714" @default.
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