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KCC2 activation during postnatal development alleviates long-term deficits in CDKL5-deficient mice
Muhammad Nauman Arshad1, Christopher Bope1, Noell Cho1
1Department of Neuroscience, Tufts University School of Medicine, Boston, MA, USA.
Experimental & Molecular Medicine
|February 18, 2026
Summary
Enhancing Potassium chloride cotransporter (KCC2) function may treat Cyclin-dependent kinase-like 5 (CDKL5) deficiency disorder (CDD). KCC2 activation in early life reduced seizures and improved cognitive and behavioral deficits in a mouse model.
Area of Science:
- Neuroscience
- Developmental Biology
- Pharmacology
Background:
- Cyclin-dependent kinase-like 5 (CDKL5) deficiency disorder (CDD) causes severe early-onset epilepsy and developmental impairments.
- Current CDD treatments are limited, lacking efficacy for behavioral issues and causing side effects.
- The role of Potassium chloride cotransporter (KCC2), vital for inhibitory neurotransmission, in CDD is unclear.
Purpose of the Study:
- To investigate KCC2 dysfunction in a mouse model of CDD.
- To evaluate the therapeutic potential of KCC2 activation in CDD.
Main Methods:
- Utilized a constitutive Cdkl5 knockout mouse model.
- Employed liquid chromatography-tandem mass spectrometry for unbiased KCC2 phosphorylation analysis.
- Administered a KCC2 activator (OV350) during a critical developmental window (postnatal days 10-21).
Main Results:
- Observed aberrant KCC2 phosphorylation and reduced expression in CDD mice, indicating impaired KCC2 activity.
- KCC2 expression and phosphorylation significantly altered between postnatal days 14 and 21.
- OV350 treatment reduced infantile spasms and, in adulthood, decreased seizure susceptibility and improved cognitive/behavioral deficits.
Conclusions:
- KCC2 dysfunction is implicated in CDD pathophysiology.
- Enhancing KCC2 function during early development presents a promising therapeutic strategy for CDD.
- This approach may also benefit other developmental and epileptic encephalopathies.
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