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This Article Full Text Full Text (PDF) All Versions of this Article: 294/6/L1127    most recent 00057.2008v1 Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Web of Science (7) Citing Articles via Google Scholar Google Scholar Articles by Besecker, B. Articles by Knoell, D. L. Search for Related Content PubMed PubMed Citation Articles by Besecker, B. Articles by Knoell, D. L.

The human zinc transporter SLC39A8 (Zip8) is critical in zinc-mediated cytoprotection in lung epithelia

¹Department of Pharmacy, ²Dorothy M. Davis Heart and Lung Research Institute, ³Division of Pulmonary, Critical Care, and Sleep Medicine, and ⁴Department of Medical Pharmacology, The Ohio State University, Columbus, Ohio

Submitted 1 February 2008 ; accepted in final form 29 March 2008

Zinc is an essential micronutrient and cytoprotectant involved in the host response to inflammatory stress. We tested whether zinc transporters, the critical regulators that maintain intracellular zinc concentrations, play a role in cell survival, particularly in lung epithelia, during inflammation. Initially, mRNA transcripts were quantitatively measured by RT-PCR for all known human zinc transporters, including 14 importers (SLC39A_1–14) and 10 exporters (SLC30A_1–10), in primary human lung epithelia obtained from multiple human donors and BEAS-2B cell cultures under baseline and TNF--stimulated conditions. While many zinc transporters were constitutively expressed, only SLC39A8 (Zip8) mRNA was strongly induced by TNF-. Endogenous Zip8 protein was not routinely detected under baseline conditions. In sharp contrast, TNF- induced the expression of a glycosylated protein that translocated to the plasma membrane and mitochondria. Increased Zip8 expression resulted in an increase in intracellular zinc content and coincided with cell survival in the presence of TNF-. Inhibition of Zip8 expression using a short interfering RNA probe reduced cellular zinc content and impaired mitochondrial function in response to TNF-, resulting in loss of cell viability. These data are the first to characterize human Zip8 and remarkably demonstrate that upregulation of Zip8 is sufficient to protect lung epithelia against TNF--induced cytotoxicity. We conclude that Zip8 is unique, relative to other Zip proteins, by functioning as an essential zinc importer at the onset of inflammation, thereby facilitating cytoprotection within the lung.

inflammation; tissue injury; cell death

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