Trpm4 differentially regulates Th1 and Th2 function by altering calcium signaling and NFAT localization.

The Journal of Immunology : Official Journal of the American Association of Immunologists
K Scott WeberPaul M Allen

Abstract

Th cell subsets have unique calcium (Ca(2+)) signals when activated with identical stimuli. The regulation of these Ca(2+) signals and their correlation to the biological function of each T cell subset remains unclear. Trpm4 is a Ca(2+)-activated cation channel that we found is expressed at higher levels in Th2 cells compared with Th1 cells. Inhibition of Trpm4 expression increased Ca(2+) influx and oscillatory levels in Th2 cells and decreased influx and oscillations in Th1 cells. This inhibition of Trpm4 expression also significantly altered T cell cytokine production and motility. Our experiments revealed that decreasing Trpm4 levels divergently regulates nuclear localization of NFATc1. Consistent with this, gene profiling did not show Trpm4-dependent transcriptional regulation, and T-bet and GATA-3 levels remain identical. Thus, Trpm4 is expressed at different levels in Th cells and plays a distinctive role in T cell function by differentially regulating Ca(2+) signaling and NFATc1 localization.

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