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The trace element zinc is essential for the immune system, and its dysregulation and deficiency results in impaired immune function. Recent studies have shown that zinc can behave as an intracellular signaling molecule in immune cells. We have previously demonstrated that L-type calcium channel (LTCC) is involved in the regulation of zinc signaling, Zinc wave and cytokine production by stimulating Fc epsilon receptor for immunoglobulin E (IgE) in mast cells. However, it is not known whether LTCC-mediated Zinc wave is required for cytokine production by stimulation of toll-like receptors and cytokine receptors in mast cells. Here we report that stimulation of toll-like receptors and cytokine receptors can induce Zinc wave in mast cells and regulate the expression of cytokine genes. The LTCC antagonist nicardipine inhibited lipopolysaccharide (LPS)- and interleukin-33 (IL-33)-mediated Zinc wave and the induction of cytokine genes such as IL-6. Consistent with these results, the zinc chelator N,N,N',N'-tetrakis(2-pyridylmethyl)ethylenediamine (TPEN) also inhibited LPS- and IL-33-induced cytokine gene expression. Furthermore, LPS induced Zinc wave not only in mast cells but also in dendritic cells. Together, these observations show that Zinc wave is activated by various stimuli and is linked to cytokine gene induction in immune cells.

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L-Type Calcium Channel-Mediated Zinc Wave Is Involved in the Regulation of IL-6 by Stimulating Non-IgE with LPS and IL-33 in Mast Cells and Dendritic Cells