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J Physiol 2001 Aug 01;534Pt 3:763-76.
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Developmental expression of the novel voltage-gated sodium channel auxiliary subunit beta3, in rat CNS.

Shah BS , Stevens EB , Pinnock RD , Dixon AK , Lee K .

1. We have compared the mRNA distribution of sodium channel alpha subunits known to be expressed during development with the known auxiliary subunits Nabeta1.1 and Nabeta2.1 and the novel, recently cloned subunit, beta3. 2. In situ hybridisation studies demonstrated high levels of Nav1.2, Nav1.3, Nav1.6 and beta3 mRNA at embryonic stages whilst Nabeta1.1 and Nabeta2.1 mRNA was absent throughout this period. 3. Nabeta1.1 and Nabeta2.1 expression occurred after postnatal day 3 (P3), increasing steadily in most brain regions until adulthood. beta3 expression differentially decreased after P3 in certain areas but remained high in the hippocampus and striatum. 4. Emulsion-dipped slides showed co-localisation of beta3 with Nav1.3 mRNA in areas of the CNS suggesting that these subunits may be capable of functional interaction. 5. Co-expression in Xenopus oocytes revealed that beta3 could modify the properties of Nav1.3; beta3 changed the equilibrium of Nav1.3 between the fast and slow gating modes and caused a negative shift in the voltage dependence of activation and inactivation. 6. In conclusion, beta3 is shown to be the predominant beta subunit expressed during development and is capable of modulating the kinetic properties of the embryonic Nav1.3 subunit. These findings provide new information regarding the nature and properties of voltage-gated sodium channels during development.

PubMed ID: 11483707
PMC ID: PMC2278751
Article link: J Physiol

Species referenced: Xenopus
Genes referenced: nav1 scn3a scn8a

References [+] :
Alcaraz, Down-regulation of voltage-dependent sodium channels coincides with a low expression of alphabeta1 subunit complexes. 1998, Pubmed