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The Journal of Neuroscience, July 1, 2000, 20(13):4954-4961
Critical Period for Activity-Dependent Synapse Elimination in Developing Cerebellum
Sho Kakizawa1, 2, Miwako Yamasaki3, Masahiko Watanabe3, and Masanobu Kano1, 2 1 Department of Physiology, Kanazawa University School of Medicine, Kanazawa 920-8640, Japan, 2 Core Research for Evolutional Science and Technology, Japan Science and Technology Corporation, Kawaguchi, Saitama 332-0012, Japan, and 3 Department of Anatomy, Hokkaido University School of Medicine, Sapporo 060-8638, Japan
Synapse elimination is considered to be the final step in neural circuit formation, by causing refinement of redundant connections formed at earlier developmental stages. The developmental loss of climbing fiber innervation from cerebellar Purkinje cells is an example of such synapse elimination. It has been suggested that NMDA receptors are involved in the elimination of climbing fiber synapses. In the present study, we probed the NMDA receptor-dependent period of climbing fiber synapse elimination by using daily intraperitoneal injections of the NMDA receptor antagonist MK-801. We found that blockade of NMDA receptors during postnatal day 15 (P15) and P16, but not before or after this period, resulted in a higher incidence of multiple climbing fiber innervation and caused a mild but persistent loss of motor coordination. Neither basic synaptic functions nor cerebellar morphology were affected by this manipulation. Chronic local application of MK-801 to the cerebellum during P15 and P16 also yielded a higher incidence of multiple climbing fiber innervation. During P15-P16, large NMDA receptor-mediated EPSCs were detected at the mossy fiber-granule cell synapse, but not at the parallel fiber-Purkinje cell or climbing fiber-Purkinje cell synapse. It is therefore likely that the NMDA receptors located at the mossy fiber-granule cell synapse mediate signals leading to the elimination of surplus climbing fibers. These results suggest that an NMDA receptor-dependent phase of climbing fiber synapse elimination lasts 2 d at most. During this phase, the final refinement of climbing fiber synapses occurs, and disruption of this process leads to permanent impairment of cerebellar function.
Key words: climbing fiber; Purkinje cell; cerebellum; synapse elimination; development; critical period; NMDA receptor; MK-801; activity-dependent
Copyright © 2000 Society for Neuroscience 0270-6474/00/20134954-08$05.00/0
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