期刊
CELL REPORTS
卷 3, 期 4, 页码 1239-1251出版社
CELL PRESS
DOI: 10.1016/j.celrep.2013.03.023
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类别
资金
- Dutch Organization for Medical Sciences (ZonMw)
- Life Sciences (ALW)
- Erasmus University Fellowship
- Senter (Neuro-Basic) program of the EU
- ERC-adv program of the EU
- CEREBNET program of the EU
- C7 program of the EU
- EU EUROHEAD''
- Centre for Medical Systems Biology
Cerebellar granule cells (GCs) account for more than half of all neurons in the CNS of vertebrates. Theoretical work has suggested that the abundance of GCs is advantageous for sparse coding during memory formation. Here, we minimized the output of the majority of GCs by selectively eliminating their Ca(V)2.1 (P/Q-type) Ca2+ channels, which mediate the bulk of their neurotransmitter release. This resulted in reduced GC output to Purkinje cells (PCs) and stellate cells (SCs) as well as in impaired long-term plasticity at GC-PC synapses. As a consequence modulation amplitude and regularity of simple spike (SS) output were affected. Surprisingly, the overall motor performance was intact, whereas demanding motor learning and memory consolidation tasks were compromised. Our findings indicate that a minority of functionally intact GCs is sufficient for the maintenance of basic motor performance, whereas acquisition and stabilization of sophisticated memories require higher numbers of normal GCs controlling PC firing.
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