Contactin Associates with Na+ Channels and Increases Their Functional Expression

Overview

Journal J Neurosci

Specialty Neurology

Date 2001 Sep 22

PMID 11567041

Citations 72

Authors

J D Malhotra

D P McEwen

L N Mattei

E O Berglund

B Ranscht

S R Levinson

M Schachner

P Shrager

L L Isom

Z C Xiao

Affiliations

Soon will be listed here.

Abstract

Contactin (also known as F3, F11) is a surface glycoprotein that has significant homology with the beta2 subunit of voltage-gated Na(+) channels. Contactin and Na(+) channels can be reciprocally coimmunoprecipitated from brain homogenates, indicating association within a complex. Cells cotransfected with Na(+) channel Na(v)1.2alpha and beta1 subunits and contactin have threefold to fourfold higher peak Na(+) currents than cells with Na(v)1.2alpha alone, Na(v)1.2/beta1, Na(v)1.2/contactin, or Na(v)1.2/beta1/beta2. These cells also have a correspondingly higher saxitoxin binding, suggesting an increased Na(+) channel surface membrane density. Coimmunoprecipitation of different subunits from cell lines shows that contactin interacts specifically with the beta1 subunit. In the PNS, immunocytochemical studies show a transient colocalization of contactin and Na(+) channels at new nodes of Ranvier forming during remyelination. In the CNS, there is a particularly high level of colocalization of Na(+) channels and contactin at nodes both during development and in the adult. Contactin may thus significantly influence the functional expression and distribution of Na(+) channels in neurons.

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