期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 106, 期 33, 页码 14102-14107出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0902820106
关键词
cerebellum; climbing fiber; coculture; synapse competition; synaptogenesis
资金
- Centre National de la Recherche Scientifique
- Universite Pierre et Marie Curie-Paris6
- Institut pour la Recherche sur la Moelle epiniere et l'Encephale
- Fondation pour la Recherche Medicale
During developmental synaptogenesis, the pre- and postsynaptic cells undergo specific interactions that lead to the establishment of the mature circuit. We have studied the roles of the pre- and postsynaptic cells in establishing this mature innervation by using an in vitro model of synaptic development. We describe climbing fiber (CF)-Purkinje cell (PC) synaptogenesis in cultured mouse hindbrain explants and show that synaptic competition occurs during early development in vitro. By manipulating the maturation stage of each of the synaptic partners in a coculture experimental paradigm, we found that multi-innervation does not occur when both synaptic partners are mature and have already experienced synapse elimination; in contrast, mature PCs can be multi-innervated when they have never experienced synapse elimination and/or when CFs are immature. However in these cases, the normal process of synapse elimination is impaired. These results show that CF-synapse elimination occurs only during a PC-dependant critical period and triggers indelible signals that prevent synapse competition in the mature system.
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