Key result
8-bromo-cGMP depolarizes pulmonary endothelial cells and inhibits inwardly rectifying K+ currents independently of PKG.
Why the study?
Membrane-permeable cGMP analogs prevent endothelial barrier disruption, but the effect of cGMP on inwardly rectifying K+ currents and membrane potential in pulmonary vascular endothelial cells was unclear.
8-bromo-cGMP induces depolarization in pulmonary endothelial cells via PKG-independent inhibition of K_IR currents, potentially protecting against barrier dysfunction by reducing the driving force for Ca2+ entry.
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Hypothesis-generating for endothelial ion channel regulation in lung injury; leaves open translation to human pulmonary vascular disease.
Shimoda et al. (2002) studied Endothelial barrier dysfunction. 8-bromo-cGMP was evaluated on Membrane potential (Em) and inwardly rectifying K+ (KIR) currents. 8-bromo-cGMP induced depolarization and inhibited inwardly rectifying K+ currents in bovine pulmonary endothelial cells in a PKG-independent manner.
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