Calcium/calmodulin-dependent protein kinase IIdelta 2 and gamma isoforms regulate potassium currents of rat brain capillary endothelial cells under hypoxic conditions

The Journal of Biological Chemistry
Zsolt BallaIngolf E Blasig

Abstract

Endothelial K+ and Ca2+ homeostasis plays an important role in the regulation of tissue supply and metabolism under normal and pathological conditions. However, the exact molecular mechanism of how Ca2+ is involved in the regulation of K+ homeostasis in capillary endothelial cells, especially under oxidative stress, is not clear. To reveal Ca2+-triggered pathways, which modulate K+ homeostasis, Ca2+/calmodulin-dependent protein kinase II and voltage-gated outward K+ currents were studied in rat brain capillary endothelial cells under hypoxia. Whole cell voltage-clamp measurements showed voltage-gated outward K+ current with transient and sustained components. mRNA and protein of Ca2+/calmodulin-dependent protein kinase II delta2 and two gamma isoenzymes were identified. Activation of the isoforms (autophosphorylation) was typically achieved by the Ca2+ ionophore ionomycin, which was prevented by the Ca2+/calmodulin-dependent protein kinase II-specific inhibitor KN-93. Hypoxia resulted in autophosphorylation of the delta2 and gammaB isoforms, augmented the current amplitude, increased the inactivation time constant, and decreased the extent of inactivation of the transient current. KN-93 prevented both the activation of the isof...Continue Reading

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Citations

Dec 24, 2010·American Journal of Physiology. Cell Physiology·Larissa A Shimoda, Jan Polak
Oct 11, 2013·Journal of Cardiovascular Magnetic Resonance : Official Journal of the Society for Cardiovascular Magnetic Resonance·Henry ChangSubha V Raman
Jun 24, 2015·Cell Calcium·Fanny ToussaintJonathan Ledoux
Jun 17, 2016·American Journal of Physiology. Cell Physiology·Fanny ToussaintJonathan Ledoux
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Mar 14, 2021·Translational Stroke Research·Xuejing ZhangJane Q Wang

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