Abstract
A coordinated network of zinc transporters and binding proteins tightly regulate cellular zinc levels. Canonical responses to zinc availability are thought to be mediated by changes in gene expression of key zinc transporters. We investigated the temporal relationships of actual zinc uptake with patterns of gene expression in membrane-bound zinc transporters in the human immortalized T lymphocyte Jurkat cell line. Cellular zinc levels were elevated or reduced with exogenous zinc sulfate or N,N,N′,N-tetrakis(2-pyridylmethyl)ethylenediamine (TPEN), respectively. Excess zinc resulted in a rapid 44 % decrease in the rate of zinc uptake within 10 min. After 120 min, the expression of metallothionein (positive control) increased, as well as the zinc exporter, ZnT1; however, the expression of zinc importers did not change during this time period. Zinc chelation with TPEN resulted in a rapid twofold increase in the rate of zinc uptake within 10 min. After 120 min, the expression of ZnT1 decreased, while again the expression of zinc importers did not change. Overall, zinc transporter gene expression kinetics did not match actual changes in cellular zinc uptake with exogenous zinc or TPEN treatments. This suggests zinc transporter regulation may be the initial response to changes in zinc within Jurkat cells.
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Acknowledgments
The authors wish to thank Adrian Moy and Ally Torres for technical assistance with this study. The authors wish to thank Sarah Burke, Mark Shigenaga, and Barbara Sutherland for helpful discussions during the preparation of the manuscript. Funding was provided by HarvestPlus.
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Holland, T.C., Killilea, D.W., Shenvi, S.V. et al. Acute changes in cellular zinc alters zinc uptake rates prior to zinc transporter gene expression in Jurkat cells. Biometals 28, 987–996 (2015). https://doi.org/10.1007/s10534-015-9883-3
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DOI: https://doi.org/10.1007/s10534-015-9883-3