Differential isoform-specific control of KCC2 function in developing and mature cortical neurons.

KCC2a isoform acts as a developmental switch, inhibiting KCC2b in early neurons and stabilizing it in mature cortical neurons, crucial for synaptic inhibition.

• Why it matters: Understanding how KCC2 isoforms regulate inhibitory signaling is vital for insights into brain development and neurological disorders involving GABAergic dysfunction.
• What they did: The study examined KCC2a and KCC2b in cortical neurons, revealing KCC2a's bidirectional regulation: promoting phosphorylation and hindering KCC2b in immature neurons, and enhancing KCC2b stability and function in mature neurons.
• The result: KCC2a's dual role enables proper development of inhibitory circuits, suggesting it could be targeted to modulate synaptic inhibition and treat related neurological conditions.