Purkinje cell outputs selectively inhibit a subset of unipolar brush cells in the input layer of the cerebellar cortex

eLife

Wade G Regehr¹  Stephanie Rudolph¹  Morgan E Neuwirth¹  Chong Guo¹ 

[1] Department of Neurobiology, Harvard Medical School, Boston, United States;

关键词: cerebellum;    unipolar brush cell;    purkinje cell;    inhibition;    GABAB;    target dependent;    vestibular cerebellum;    Mouse;   

DOI  :  10.7554/eLife.68802

来源: eLife Sciences Publications, Ltd

【 摘 要 】

Circuitry of the cerebellar cortex is regionally and functionally specialized. Unipolar brush cells (UBCs), and Purkinje cell (PC) synapses made by axon collaterals in the granular layer, are both enriched in areas that control balance and eye movement. Here, we find a link between these specializations in mice: PCs preferentially inhibit metabotropic glutamate receptor type 1 (mGluR1)-expressing UBCs that respond to mossy fiber (MF) inputs with long lasting increases in firing, but PCs do not inhibit mGluR1-lacking UBCs. PCs inhibit about 29% of mGluR1-expressing UBCs by activating GABAA receptors (GABAARs) and inhibit almost all mGluR1-expressing UBCs by activating GABAB receptors (GABABRs). PC to UBC synapses allow PC output to regulate the input layer of the cerebellar cortex in diverse ways. Based on optogenetic studies and a small number of paired recordings, GABAAR-mediated feedback is fast and unreliable. GABABR-mediated inhibition is slower and is sufficiently large to strongly influence the input-output transformations of mGluR1-expressing UBCs.

【 授权许可】

CC BY