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Updated: Feb 19, 2026
10:08
Study of the Functions and Activities of Neuronal K-Cl Co-Transporter KCC2 Using Western Blotting
Published on: December 9, 2022
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N-Ethylmaleimide increases KCC2 cotransporter activity by modulating transporter phosphorylation
Leslie C Conway1, Ross A Cardarelli1, Yvonne E Moore2,3
1From the AstraZeneca Tufts Laboratory for Basic and Translational Neuroscience, Boston, Massachusetts 02111.
The Journal of Biological Chemistry
|November 3, 2017
Summary
N-ethylmaleimide (NEM) enhances KCC2 transporter activity by increasing its cell surface presence and altering phosphorylation. Targeting these mechanisms may yield new therapies for neurological disorders.
Area of Science:
- Neuroscience
- Molecular Biology
- Pharmacology
Background:
- K+ /Cl- cotransporter 2 (KCC2) is crucial for neuronal function, enabling inhibitory neurotransmission via GABA(A) receptors.
- Dysfunctional KCC2 is linked to epilepsy, neurodevelopmental disorders, neuropathic pain, and schizophrenia, driving interest in therapeutic activators.
Purpose of the Study:
- To elucidate the mechanism by which N-ethylmaleimide (NEM) enhances KCC2 transporter activity.
- To identify cellular targets for developing novel KCC2 activators.
Main Methods:
- Biochemical and electrophysiological approaches were used to study KCC2 regulation by NEM in neurons.
- Investigated changes in KCC2 cell surface levels and phosphorylation patterns.
Main Results:
- NEM rapidly increased KCC2 cell surface expression and modulated phosphorylation at Ser-940 (increased) and Thr-1007 (decreased).
- NEM reduced WNK kinase phosphorylation of SPAK, a kinase targeting KCC2 at Thr-1007.
- Mutational analysis confirmed that Thr-1007 dephosphorylation mediates NEM's effect on KCC2 activity.
Conclusions:
- Compounds enhancing KCC2 surface stability or reducing Thr-1007 phosphorylation may act as KCC2 activators.
- Findings provide mechanistic insights into KCC2 regulation for therapeutic development.
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