Involvement of nectins in the formation of puncta adherentia junctions and the mossy fiber trajectory in the mouse hippocampus

Tomoyuki Honda, Toshiaki Sakisaka, Tomohiro Yamada, Noriko Kumazawa, Takashi Hoshino, Mihoko Kajita, Tetsuro Kayahara, Hiroyoshi Ishizaki, Miki Tanaka-Okamoto, Akira Mizoguchi, Toshiya Manabe, Jun Miyoshi, Yoshimi Takai

Research output: Contribution to journalArticlepeer-review

84 Citations (Scopus)

Abstract

Synapses are specialized intercellular junctions whose specificity and plasticity are mediated by synaptic cell adhesion molecules. In hippocampus, the mossy fibers form synapses on the apical dendrites of the CA3 pyramidal cells where synaptic and puncta adherentia junctions (PAJs) are highly developed. Synaptic junctions are the sites of neurotransmission, while PAJs are regarded as mechanical adhesion sites. Cell-cell adhesion molecules nectin-1 and nectin-3 asymmetrically localize at the pre- and post-synaptic sides of PAJs, respectively. To reveal the definitive role of nectins, we analyzed nectin-1-/- and nectin-3-/- mice. In both the mutant mice, the number of PAJs at the synapses between the mossy fiber terminals and the dendrites of the CA3 pyramidal cells was reduced. In addition, the abnormal mossy fiber trajectory was observed. These results indicate that nectins are involved in the formation of PAJs, which maintain the proper mossy fiber trajectory.

Original languageEnglish
Pages (from-to)315-325
Number of pages11
JournalMolecular and Cellular Neuroscience
Volume31
Issue number2
DOIs
Publication statusPublished - Feb 2006
Externally publishedYes

ASJC Scopus subject areas

  • Molecular Biology
  • Cellular and Molecular Neuroscience
  • Cell Biology

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