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Nat Immunol. 2012 Sep;13(9):880-7. doi: 10.1038/ni.2379. Epub 2012 Jul 29.

A voltage-gated sodium channel is essential for the positive selection of CD4(+) T cells.

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  • 1Department of Immunology and Pathology, Washington University School of Medicine, St. Louis, Missouri, USA.

Abstract

The sustained entry of Ca(2+) into CD4(+)CD8(+) double-positive thymocytes is required for positive selection. Here we identified a voltage-gated Na(+) channel (VGSC) that was essential for positive selection of CD4(+) T cells. Pharmacological inhibition of VGSC activity inhibited the sustained Ca(2+) influx induced by positively selecting ligands and the in vitro positive selection of CD4(+) but not CD8(+) T cells. In vivo short hairpin RNA (shRNA)-mediated knockdown of the gene encoding a regulatory β-subunit of a VGSC specifically inhibited the positive selection of CD4(+) T cells. Ectopic expression of VGSC in peripheral AND CD4(+) T cells bestowed the ability to respond to a positively selecting ligand, which directly demonstrated that VGSC expression was responsible for the enhanced sensitivity. Thus, active VGSCs in thymocytes provide a mechanism by which a weak positive selection signal can induce the sustained Ca(2+) signals required for CD4(+) T cell development.

Comment in

PMID:
22842345
[PubMed - indexed for MEDLINE]
PMCID:
PMC3426661
Free PMC Article

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