1. Academic Validation
  2. Astrocytes and oligodendrocytes in the thalamus jointly maintain synaptic activity by supplying metabolites

Astrocytes and oligodendrocytes in the thalamus jointly maintain synaptic activity by supplying metabolites

  • Cell Rep. 2021 Jan 19;34(3):108642. doi: 10.1016/j.celrep.2020.108642.
Camille Philippot 1 Stephanie Griemsmann 1 Ronald Jabs 1 Gerald Seifert 1 Helmut Kettenmann 2 Christian Steinhäuser 3
Affiliations

Affiliations

  • 1 Institute of Cellular Neurosciences, Medical Faculty, University of Bonn, Venusberg-Campus 1, 53127 Bonn, Germany.
  • 2 Cellular Neurosciences, Max Delbrück Center for Molecular Medicine in the Helmholtz Association, Robert Roessle Str. 10, 13125 Berlin, Germany.
  • 3 Institute of Cellular Neurosciences, Medical Faculty, University of Bonn, Venusberg-Campus 1, 53127 Bonn, Germany. Electronic address: [email protected].
Abstract

Thalamic astrocytes and oligodendrocytes are coupled via gap junctions and form panglial networks. Here, we show that these networks have a key role in energy supply of neurons. Filling an astrocyte or an oligodendrocyte in acute slices with glucose or lactate is sufficient to rescue the decline of stimulation-induced field post-synaptic potential (fPSP) amplitudes during extracellular glucose deprivation (EGD). In mice lacking oligodendroglial coupling, loading an astrocyte with glucose does not rescue the EGD-mediated loss of fPSPs. Monocarboxylate and glucose transporters are required for rescuing synaptic activity during EGD. In mice deficient in astrocyte coupling, filling of an oligodendrocyte with glucose does not rescue fPSPs during EGD. Our results demonstrate that, in the thalamus, astrocytes and oligodendrocytes are jointly engaged in delivering energy substrates for sustaining neuronal activity and suggest that oligodendrocytes exert their effect mainly by assisting astrocytes in metabolite transfer to the postsynapse.

Keywords

astrocyte; metabolite support; oligodendrocyte; panglial coupling; thalamus.

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