Institut for Biomedicin

Marco Capogna

Slow GABA transient and receptor desensitization shape synaptic responses evoked by hippocampal neurogliaform cells

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  • Theofanis Karayannis, Medical Research Council Anatomical Neuropharmacology Unit, Mansfield Road, Oxford OX1 3TH, United Kingdom.
  • ,
  • David Elfant
  • ,
  • Icnelia Huerta-Ocampo
  • ,
  • Sundeep Teki
  • ,
  • Ricardo S Scott
  • ,
  • Dmitri A Rusakov
  • ,
  • Mathew V Jones
  • ,
  • Marco Capogna

The kinetics of GABAergic synaptic currents can vary by an order of magnitude depending on the cell type. The neurogliaform cell (NGFC) has recently been identified as a key generator of slow GABA(A) receptor-mediated volume transmission in the isocortex. However, the mechanisms underlying slow GABA(A) receptor-mediated IPSCs and their use-dependent plasticity remain unknown. Here, we provide experimental and modeling data showing that hippocampal NGFCs generate an unusually prolonged (tens of milliseconds) but low-concentration (micromolar range) GABA transient, which is responsible for the slow response kinetics and which leads to a robust desensitization of postsynaptic GABA(A) receptors. This strongly contributes to the use-dependent synaptic depression elicited by various patterns of NGFC activity including the one detected during theta network oscillations in vivo. Synaptic depression mediated by NGFCs is likely to play an important modulatory role in the feedforward inhibition of CA1 pyramidal cells provided by the entorhinal cortex.

OriginalsprogEngelsk
TidsskriftThe Journal of neuroscience : the official journal of the Society for Neuroscience
Vol/bind30
Nummer29
Sider (fra-til)9898-909
Antal sider12
ISSN0270-6474
DOI
StatusUdgivet - 21 jul. 2010

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