Involvement of nectins in the formation of puncta adherentia junctions and the mossy fiber trajectory in the mouse hippocampus
| Autor: | Akira Mizoguchi, Hiroyoshi Ishizaki, Jun Miyoshi, Mihoko Kajita, Tomoyuki Honda, Tomohiro Yamada, Takashi Hoshino, Toshiya Manabe, Yoshimi Takai, Noriko Kumazawa, Toshiaki Sakisaka, Tetsuro Kayahara, Miki Tanaka-Okamoto |
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| Rok vydání: | 2006 |
| Předmět: |
Male
Mossy fiber (hippocampus) Nectins Hippocampus Biology Neurotransmission Synaptic Transmission Cell junction Mice Cellular and Molecular Neuroscience Nectin Animals Molecular Biology Mice Knockout Mouse Hippocampus Neuronal Plasticity Cell adhesion molecule Microfilament Proteins Cell Biology Adhesion Cadherins Electrophysiology Mice Inbred C57BL Intercellular Junctions Animals Newborn Mossy Fibers Hippocampal Synapses Biophysics Cell Adhesion Molecules Neuroscience |
| Zdroj: | Molecular and Cellular Neuroscience. 31:315-325 |
| ISSN: | 1044-7431 |
| DOI: | 10.1016/j.mcn.2005.10.002 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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