Abstract
Parvovirus B19 (B19V) has previously been shown to cause endothelial dysfunction. B19V capsid protein VP1 harbors a lysophosphatidylcholine producing phospholipase A2 (PLA2). Lysophosphatidylcholine inhibits Na+/K+ ATPase, which in turn may impact on the activity of inwardly rectifying K+ channels. The present study explored whether VP1 modifies the activity of Kir2.1 K+ channels. cRNA encoding Kir2.1 was injected into Xenopus oocytes without or with cRNA encoding VP1 isolated from a patient suffering from fatal B19V-induced inflammatory cardiomyopathy or the VP1 mutant H153AVP1 lacking a functional PLA2 activity. K+ channel activity was determined by dual electrode voltage clamp. In addition, Na+/K+-ATPase activity was estimated from K+-induced pump current (I pump) and ouabain-inhibited current (I ouabain). Injection of cRNA encoding Kir2.1 into Xenopus oocytes was followed by appearance of inwardly rectifying K+ channel activity (I K), which was significantly decreased by additional injection of cRNA encoding VP1, but not by additional injection of cRNA encoding H153AVP1. The effect of VP1 on I K was mimicked by lysophosphatidylcholine (1 μg/ml) and by inhibition of Na+/K+-ATPase with 0.1 mM ouabain. In the presence of lysophosphatidylcholine, I K was not further decreased by additional treatment with ouabain. The B19V capsid protein VP1 thus inhibits Kir2.1 channels, an effect at least partially due to PLA2-dependent formation of lysophosphatidylcholine with subsequent inhibition of Na+/K+-ATPase activity.
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Acknowledgments
The authors acknowledge the technical assistance of E. Faber and the meticulous preparation of the manuscript by Tanja Loch. This study was supported by the Deutsche Forschungsgemeinschaft, SFB-Transregio 19 (Project TP B5).
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Ahmed, M., Elvira, B., Almilaji, A. et al. Down-Regulation of Inwardly Rectifying Kir2.1 K+ Channels by Human Parvovirus B19 Capsid Protein VP1. J Membrane Biol 248, 223–229 (2015). https://doi.org/10.1007/s00232-014-9762-9
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DOI: https://doi.org/10.1007/s00232-014-9762-9