Loss of non-canonical KCC2 functions promotes developmental apoptosis of cortical projection neurons

Martina Mavrovic, Pavel Uvarov, Eric Delpire, Laszlo Vutskits, Kai Kaila, Martin Puskarjov

Tutkimustuotos: ArtikkelijulkaisuArtikkeliTieteellinenvertaisarvioitu

Abstrakti

KCC2, encoded in humans by the SLC12A5 gene, is a multifunctional neuron-specific protein initially identified as the chloride (Cl-) extruder critical for hyperpolarizing GABA(A) receptor currents. Independently of its canonical function as a K-Cl cotransporter, KCC2 regulates the actin cytoskeleton via molecular interactions mediated through its large intracellular C-terminal domain (CTD). Contrary to the common assumption that embryonic neocortical projection neurons express KCC2 at non-significant levels, here we show that loss of KCC2 enhances apoptosis of late-born upper-layer cortical projection neurons in the embryonic brain. In utero electroporation of plasmids encoding truncated, transport-dead KCC2 constructs retaining the CTD was as efficient as of that encoding full-length KCC2 in preventing elimination of migrating projection neurons upon conditional deletion of KCC2. This was in contrast to the effect of a full-length KCC2 construct bearing a CTD missense mutation (KCC2(R952H)), which disrupts cytoskeletal interactions and has been found in patients with neurological and psychiatric disorders, notably seizures and epilepsy. Together, our findings indicate ion transport-independent, CTD-mediated regulation of developmental apoptosis by KCC2 in migrating cortical projection neurons.

Alkuperäiskielienglanti
Artikkeli48880
LehtiEMBO Reports
Vuosikerta21
Numero4
Sivumäärä13
ISSN1469-221X
DOI - pysyväislinkit
TilaJulkaistu - 3 huhtikuuta 2020
OKM-julkaisutyyppiA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä, vertaisarvioitu

Tieteenalat

  • 1182 Biokemia, solu- ja molekyylibiologia

Siteeraa tätä