Presynaptically Released Cbln1 Induces Dynamic Axonal Structural Changes by Interacting with GluD2 during Cerebellar Synapse Formation

Aya Ito-Ishida, Taisuke Miyazaki, Eriko Miura, Keiko Matsuda, Masahiko Watanabe, Michisuke Yuzaki, Shigeo Okabe

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Differentiation of pre- and postsynaptic sites is coordinated by reciprocal interaction across synaptic clefts. At parallel fiber (PF)-Purkinje cell (PC) synapses, dendritic spines are autonomously formed without PF influence. However, little is known about how presynaptic structural changes are induced and how they lead to differentiation of mature synapses. Here, we show that Cbln1 released from PFs induces dynamic structural changes in PFs by a mechanism that depends on postsynaptic glutamate receptor delta2 (GluD2) and presynaptic neurexin (Nrx). Time-lapse imaging in organotypic culture and ultrastructural analyses in vivo revealed that Nrx-Cbln1-GluD2 signaling induces PF protrusions that often formed circular structures and encapsulated PC spines. Such structural changes in PFs were associated with the accumulation of synaptic vesicles and GluD2, leading to formation of mature synapses. Thus, PF protrusions triggered by Nrx-Cbln1-GluD2 signaling may promote bidirectional maturation of PF-PC synapses by a positive feedback mechanism

Original languageEnglish
Pages (from-to)549-564
Number of pages16
JournalNeuron
Volume76
Issue number3
DOIs
Publication statusPublished - 2012 Nov 8

ASJC Scopus subject areas

  • Neuroscience(all)

Fingerprint Dive into the research topics of 'Presynaptically Released Cbln1 Induces Dynamic Axonal Structural Changes by Interacting with GluD2 during Cerebellar Synapse Formation'. Together they form a unique fingerprint.

Cite this