Ganna Korniychuk

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Stress-dependent regulation of cardiac action potential duration is mediated by the sympathetic nervous system and the hypothalamic-pituitary-adrenal axis. It is accompanied by an increased magnitude of the slow outward potassium ion current, I(Ks). KCNQ1 and KCNE1 subunits coassemble to form the I(Ks) channel. Mutations in either subunit cause long QT(More)
Physical and emotional stress is accompanied by release of stress hormones such as the glucocorticoid cortisol. This hormone upregulates the serum- and glucocorticoid-inducible kinase (SGK)1, which in turn stimulates I(Ks), a slow delayed rectifier potassium current that mediates cardiac action potential repolarization. Mutations in I(Ks) channel alpha(More)
The KCNQ gene family comprises voltage-gated potassium channels expressed in epithelial tissues (KCNQ1, KCNQ5), inner ear structures (KCNQ1, KCNQ4) and the brain (KCNQ2-5). KCNQ4 is expressed in inner and outer hair cells of the inner ear where it determines electrical excitability. Accordingly, loss of function mutations of the KCNQ4 gene cause hearing(More)
The TGF-beta superfamily of secreted signalling molecules plays a pivotal role in the regulation of early embryogenesis, organogenesis and adult tissue homeostasis. Here we report the identification of Xenopus N-acetylgalactosaminyltransferase-like 1 (xGalntl-1) as a novel important regulator of TGF-beta signalling. N-acetylgalactosaminyltransferases(More)
The human cardiac transient outward potassium current Ito is formed by co-assembly of voltage-dependent K+ channel (Kv 4.3) pore-forming α-subunits with differently spliced K channel interacting protein (KChIP) accessory proteins. Ito is of considerable importance for the normal course of the cardiac ventricular action potential. The present study was(More)
Long-chain fatty acids acyl coenzyme A esters (LC-CoA) are obligate intermediates of fatty acid metabolism and have been shown to activate K(ATP) channels but to inhibit most other Kir channels (e.g. Kir2.1) by direct channel binding. The activation of K(ATP) channels by elevated levels of LC-CoA may be involved in the pathophysiology of type 2 diabetes,(More)
Previous studies revealed a linkage of the kainate receptor GluR6 with autism, a pervasive developmental disorder. Mutational screening in autistic patients disclosed the amino acid exchange M836I in a highly conserved domain of the cytoplasmic C-terminal region of GluR6. Here, we show that this mutation leads to GluR6 gain-of-function. By using the(More)
The serum- and glucocorticoid-inducible kinase isoform 3 (SGK3) and stargazin have both been shown to enhance the synaptic expression level of GluR1. The present study was performed to elucidate whether SGK3 and stargazin interact or are effective through different pathways in the regulation of GluR1. Proteins were expressed in Xenopus oocytes by injection(More)
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