期刊
NATURE COMMUNICATIONS
卷 11, 期 1, 页码 -出版社
NATURE RESEARCH
DOI: 10.1038/s41467-020-18984-7
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资金
- Fondation pour la Recherche Medicale (FRM) [Equipe FRM DEQ20150331681]
- Agence Nationale de la Recherche (ANR) [ANR-14-CE13-0023]
- Fondation pour l'aide a la recherche sur la Sclerose en Plaques (ARSEP)
- ANR under the frame of Neuron Cofund (Era-Net Neuron) [R19068KK]
- University of Connecticut
- National Multiple Sclerosis Society (NMSS) [RG-1612-26501]
- Region Ile-de-France
- FIRE doctoral school-Programme Bettencourt
- Universite Paris Descartes
- FRM
- Agence Nationale de la Recherche (ANR) [ANR-14-CE13-0023] Funding Source: Agence Nationale de la Recherche (ANR)
Myelination of projection neurons by oligodendrocytes is key to optimize action potential conduction over long distances. However, a large fraction of myelin enwraps the axons of parvalbumin-positive fast-spiking interneurons (FSI), exclusively involved in local cortical circuits. Whether FSI myelination contributes to the fine-tuning of intracortical networks is unknown. Here we demonstrate that FSI myelination is required for the establishment and maintenance of the powerful FSI-mediated feedforward inhibition of cortical sensory circuits. The disruption of GABAergic synaptic signaling of oligodendrocyte precursor cells prior to myelination onset resulted in severe FSI myelination defects characterized by longer internodes and nodes, aberrant myelination of branch points and proximal axon malformation. Consequently, high-frequency FSI discharges as well as FSI-dependent postsynaptic latencies and strengths of excitatory neurons were reduced. These dysfunctions generated a strong excitation-inhibition imbalance that correlated with whisker-dependent texture discrimination impairments. FSI myelination is therefore critical for the function of mature cortical inhibitory circuits. Myelination optimizes conduction speed of excitatory neurons. However, whether myelination of interneurons (INs) refines cortical networks is unclear. Here, the authors show that INs myelination shapes feedforward inhibition of mouse cortical sensory circuits and impacts whisker-mediated behaviour.
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