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• W2113236143 abstract "2-aminoethoxydiphenyl borate (2-APB) has been widely used as a blocker of the IP3 receptor and TRP channels, including store-operated calcium channels. We now show in monolayers of normal rat kidney cells (NRK/49F) that 2-APB completely and reversibly blocks gap junctional intercellular communication at concentrations similar to that required for inhibition of PGF2alpha-induced increases in intracellular calcium. Gap junctional conductances between NRK cells were estimated with single-electrode patch-clamp measurements and were fully blocked by 2-APB (50 microM), when applied extracellularly but not via the patch pipette. Half maximal inhibition (IC50) of electrical coupling in NRK cells was achieved at 5.7 microM. Similar results were obtained for human embryonic kidney epithelial cells (HEK293/tsA201) with an IC50 of 10.3 microM. Using 2-APB as an electrical uncoupler of monolayer cells, we could thus measure inward rectifier potassium, L-type calcium, and calcium-dependent chloride membrane currents in confluent NRK monolayers, with properties similar to those in dissociated NRK cells in the absence of 2-APB. The electrical uncoupling action described here is a new 2-APB property that promises to provide a powerful pharmacological tool to study single-cell properties in cultured confluent monolayers and intact tissues by electrical and chemical uncoupling of the cells without the need of prior dissociation." @default.
• W2113236143 created "2016-06-24" @default.
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• W2113236143 date "2003-03-05" @default.
• W2113236143 modified "2023-10-18" @default.
• W2113236143 title "Besides affecting intracellular calcium signaling, 2‐APB reversibly blocks gap junctional coupling in confluent monolayers, thereby allowing the measurement of single‐cell membrane currents in undissociated cells" @default.
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• W2113236143 doi "https://doi.org/10.1096/fj.02-0786fje" @default.
• W2113236143 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/12626431" @default.
• W2113236143 hasPublicationYear "2003" @default.
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