Activation of neurokinin-III receptors modulates human atrial TASK-1 currents
Rationale - The neurokinin-III receptor was recently shown to regulate atrial cardiomyocyte excitability by inhibiting atrial background potassium currents. TASK-1 (hK2P3.1) two-pore-domain potassium channels, which are expressed atrial-specifically in the human heart, contribute significantly to at...
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| Main Authors: | , , , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
November 2023
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| In: |
Journal of molecular and cellular cardiology
Year: 2023, Volume: 184, Pages: 26-36 |
| ISSN: | 1095-8584 |
| DOI: | 10.1016/j.yjmcc.2023.09.010 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1016/j.yjmcc.2023.09.010 Verlag, lizenzpflichtig, Volltext: https://www.sciencedirect.com/science/article/pii/S0022282823001554 
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| Author Notes: | Felix Wiedmann, Amelie Paasche, Jendrik Nietfeld, Manuel Kraft, Anna L. Meyer, Gregor Warnecke, Matthias Karck, Norbert Frey, Constanze Schmidt |
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| 245 | 1 | 0 | |a Activation of neurokinin-III receptors modulates human atrial TASK-1 currents |c Felix Wiedmann, Amelie Paasche, Jendrik Nietfeld, Manuel Kraft, Anna L. Meyer, Gregor Warnecke, Matthias Karck, Norbert Frey, Constanze Schmidt |
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| 520 | |a Rationale - The neurokinin-III receptor was recently shown to regulate atrial cardiomyocyte excitability by inhibiting atrial background potassium currents. TASK-1 (hK2P3.1) two-pore-domain potassium channels, which are expressed atrial-specifically in the human heart, contribute significantly to atrial background potassium currents. As TASK-1 channels are regulated by a variety of intracellular signalling cascades, they represent a promising candidate for mediating the electrophysiological effects of the Gq-coupled neurokinin-III receptor. - Objective - To investigate whether TASK-1 channels mediate the neurokinin-III receptor activation induced effects on atrial electrophysiology. - Methods and results - In Xenopus laevis oocytes, heterologously expressing neurokinin-III receptor and TASK-1, administration of the endogenous neurokinin-III receptor ligands substance P or neurokinin B resulted in a strong TASK-1 current inhibition. This could be reproduced by application of the high affinity neurokinin-III receptor agonist senktide. Moreover, preincubation with the neurokinin-III receptor antagonist osanetant blunted the effect of senktide. Mutagenesis studies employing TASK-1 channel constructs which lack either protein kinase C (PKC) phosphorylation sites or the domain which is regulating the diacyl glycerol (DAG) sensitivity domain of TASK-1 revealed a protein kinase C independent mechanism of TASK-1 current inhibition: upon neurokinin-III receptor activation TASK-1 channels are blocked in a DAG-dependent fashion. Finally, effects of senktide on atrial TASK-1 currents could be reproduced in patch-clamp measurements, performed on isolated human atrial cardiomyocytes. - Conclusions - Heterologously expressed human TASK-1 channels are inhibited by neurokinin-III receptor activation in a DAG dependent fashion. Patch-clamp measurements, performed on human atrial cardiomyocytes suggest that the atrial-specific effects of neurokinin-III receptor activation on cardiac excitability are predominantly mediated via TASK-1 currents. | ||
| 650 | 4 | |a Arrhythmia | |
| 650 | 4 | |a Atrial fibrillation | |
| 650 | 4 | |a Neurokinin-III receptor | |
| 650 | 4 | |a Neuropeptides | |
| 650 | 4 | |a TASK-1 | |
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