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Voltage-Dependent Potassium Current Recording on H9c2 Cardiomyocytes via the Whole-Cell Patch-Clamp Technique
Published on: November 11, 2022
Zn2+ regulates Kv2.1 voltage-dependent gating and localization following ischemia
Mandar A Aras1, Robert A Saadi, Elias Aizenman
1Department of Neurobiology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA.
The European Journal of Neuroscience
|January 23, 2010
Summary
Neuronal free zinc (Zn2+) plays a critical role in altering Kv2.1 channel activity and localization following ischemia, independent of calcineurin. This finding advances understanding of cellular responses to ischemic injury.
Area of Science:
- Neuroscience
- Cellular Biology
- Ion Channel Physiology
Background:
- The Kv2.1 potassium channel is crucial for neuronal function, typically found in phosphorylated somatodendritic clusters.
- Ischemia disrupts Kv2.1 localization and function, causing dephosphorylation and cluster dispersal, which is linked to intracellular calcium (Ca2+) and calcineurin.
Purpose of the Study:
- To investigate the role of neuronal free zinc (Zn2+) in the ischemic modulation of Kv2.1 channel activity and localization.
- To determine if Zn2+ acts independently of or in conjunction with calcineurin in response to ischemia.
Main Methods:
- Utilized cultured rat cortical neurons subjected to sub-lethal ischemia.
- Assessed changes in Kv2.1 phosphorylation, channel activation kinetics, and subcellular localization.
- Employed Zn2+ chelation and calcineurin inhibition as experimental interventions.
Main Results:
- Ischemia induced Kv2.1 dephosphorylation and a hyperpolarizing shift in activation kinetics, alongside cluster dispersal.
- Zn2+ chelation mimicked calcineurin inhibition, attenuating ischemic changes in Kv2.1 activation and blocking declustering.
- A rise in neuronal free Zn2+ was observed even when calcineurin was inhibited.
Conclusions:
- A calcineurin-independent rise in neuronal free Zn2+ is critical for altering Kv2.1 channel activity and localization post-ischemia.
- Zn2+ emerges as a key mediator in cellular adaptive responses to ischemic injury, offering new therapeutic targets.
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