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2017 ; 8
(1
): 1776
Nephropedia Template TP
gab.com Text
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English Wikipedia
GABA(A) receptor dependent synaptic inhibition rapidly tunes KCC2 activity via
the Cl(-)-sensitive WNK1 kinase
#MMPMID29176664
Heubl M
; Zhang J
; Pressey JC
; Al Awabdh S
; Renner M
; Gomez-Castro F
; Moutkine I
; Eugène E
; Russeau M
; Kahle KT
; Poncer JC
; Lévi S
Nat Commun
2017[Nov]; 8
(1
): 1776
PMID29176664
show ga
The K(+)-Cl(-) co-transporter KCC2 (SLC12A5) tunes the efficacy of GABA(A)
receptor-mediated transmission by regulating the intraneuronal chloride
concentration [Cl(-)](i). KCC2 undergoes activity-dependent regulation in both
physiological and pathological conditions. The regulation of KCC2 by synaptic
excitation is well documented; however, whether the transporter is regulated by
synaptic inhibition is unknown. Here we report a mechanism of KCC2 regulation by
GABA(A) receptor (GABA(A)R)-mediated transmission in mature hippocampal neurons.
Enhancing GABA(A)R-mediated inhibition confines KCC2 to the plasma membrane,
while antagonizing inhibition reduces KCC2 surface expression by increasing the
lateral diffusion and endocytosis of the transporter. This mechanism utilizes
Cl(-) as an intracellular secondary messenger and is dependent on phosphorylation
of KCC2 at threonines 906 and 1007 by the Cl(-)-sensing kinase WNK1. We propose
this mechanism contributes to the homeostasis of synaptic inhibition by rapidly
adjusting neuronal [Cl(-)](i) to GABA(A)R activity.