Accueil > Bibliographie > Axonal targeting of Caspr2 in hippocampal neurons via selective (...)

Axonal targeting of Caspr2 in hippocampal neurons via (...)

J Cell Sci. 2009 Aug ; [Epub ahead of print]
Axonal targeting of Caspr2 in hippocampal neurons via selective somatodendritic endocytosis.
Bel C, Oguievetskaia K, Pitaval C, Goutebroze L, Faivre-Sarrailh C.

Contactin-associated protein 2 (Caspr2) is a neuronal membrane protein that is mutated in autism and related disorders. Although it is highly enriched at juxtaparanodes of Ranvier where it is essential for Shaker-type K(+) channel clustering, little is known about its function and regulation. In the present study, we examined the polarized expression of Caspr2 in hippocampal neurons using extracellular hemagglutinin (HA)-tagged Caspr2 constructs. We found that Caspr2 was targeted to the axonal surface, but colocalized with early endosomes in the somatodendritic compartment. The inhibition of endocytosis using a Dynamin-1 mutant or treatment with Dynasore prevented Caspr2 internalization from the dendrites and cell body. We identified a short sequence included into the 4.1B-binding domain that is required for the endocytosis of Caspr2. This sequence contains a protein kinase C (PKC) substrate motif on Thr1292, and point mutation of this residue or treatment with a PKC inhibitor prevented the somatodendritic internalization of Caspr2. Thus, the PKC-dependent trafficking of Caspr2 underlies its polarized expression in hippocampal neurons.


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