Short-Term Plasticity Combines with Excitation–Inhibition Balance to Expand Cerebellar Purkinje Cell Dynamic Range
| Autor: | Arvind Kumar, Philippe Isope, Anais Grangeray-Vilmint, Antoine M. Valera |
|---|---|
| Přispěvatelé: | Institut des Neurosciences Cellulaires et Intégratives (INCI), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA), Royal Institute of Technology [Stockholm] (KTH ) |
| Rok vydání: | 2018 |
| Předmět: |
Male
0301 basic medicine Interneuron Purkinje cell Cerebellar Purkinje cell Inhibitory postsynaptic potential Cerebellar Cortex Mice Purkinje Cells 03 medical and health sciences 0302 clinical medicine Interneurons Cerebellum short-term dynamics excitation-inhibition balance medicine Animals Computer Simulation Research Articles Neuronal Plasticity Chemistry burst coding General Neuroscience Excitatory Postsynaptic Potentials Granule cell Electrophysiology 030104 developmental biology medicine.anatomical_structure nervous system Cerebellar cortex Excitatory postsynaptic potential [SDV.NEU]Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC] Nerve Net feedforward inhibition Neuroscience Algorithms Photic Stimulation 030217 neurology & neurosurgery Signal Transduction |
| Zdroj: | Journal of Neuroscience Journal of Neuroscience, Society for Neuroscience, 2018, 38 (22), pp.5153-5167. ⟨10.1523/JNEUROSCI.3270-17.2018⟩ |
| ISSN: | 1529-2401 0270-6474 |
| Popis: | The balance between excitation (E) and inhibition (I) in neuronal networks controls the firing rate of principal cells through simple network organization, such as feedforward inhibitory circuits. Here, we demonstrate in male mice, that at the granule cell (GrC)-molecular layer interneuron (MLI)-Purkinje cell (PC) pathway of the cerebellar cortex, E/I balance is dynamically controlled by short-term dynamics during bursts of stimuli, shaping cerebellar output. Using a combination of electrophysiological recordings, optogenetic stimulation, and modeling, we describe the wide range of bidirectional changes in PC discharge triggered by GrC bursts, from robust excitation to complete inhibition. At high frequency (200 Hz), increasing the number of pulses in a burst (from 3 to 7) can switch a net inhibition of PC to a net excitation. Measurements of EPSCs and IPSCs during bursts and modeling showed that this feature can be explained by the interplay between short-term dynamics of the GrC-MLI-PC pathway and E/I balance impinging on PC. Our findings demonstrate that PC firing rate is highly sensitive to the duration of GrC bursts, which may define a temporal-to-rate code transformation in the cerebellar cortex.SIGNIFICANCE STATEMENTSensorimotor information processing in the cerebellar cortex leads to the occurrence of a sequence of synaptic excitation and inhibition in Purkinje cells. Granule cells convey direct excitatory inputs and indirect inhibitory inputs to the Purkinje cells, through molecular layer interneurons, forming a feedforward inhibitory pathway. Using electrophysiological recordings, optogenetic stimulation, and mathematical modeling, we found that presynaptic short-term dynamics affect the balance between synaptic excitation and inhibition on Purkinje cells during high-frequency bursts and can reverse the sign of granule cell influence on Purkinje cell discharge when burst duration increases. We conclude that short-term dynamics may play an important role in transforming the duration of sensory inputs arriving on cerebellar granule cells into cerebellar cortical output firing rate. |
| Databáze: | OpenAIRE |
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