In genetically susceptible humans and/or experimental animals, ions of heavy metals, Hg (II), Au (III), and Ag (I) have been shown to strongly induce autoimmunity, in which mast cells have been implicated to play a role. Here, we demonstrate that Ag (I) application results in mast cell death through a unique Ca 2+ - and mitochondria-dependent pathway. As cellular susceptibilities to Ag (I) cytotoxicity varied considerably, we analyzed the cell death pathway in the low and high responding cells. In the low responding cells, long application (e.g., 20 h) of Ag (I) at concentrations (≥30 μM) induced cell death, which was accompanied by mitochondrial membrane depolarization, cyt c release, and caspase-3/7 activation but was not prevented by selective inhibitors of caspase-3/7 and the mitochondrial permeability transition. The cell death was preceded by elevations in the cytoplasmic and mitochondrial Ca 2+ levels, and Ca 2+ responses and cell death were prevented by thiol reagents, including DTT, N-acetylcysteine, and reduced glutathione monoethyl ester. In the high responding cells, Ag (I) evoked considerable cell death by necrosis within 1 h, without inducing caspase activation, and this cell death was reduced significantly by depleting extracellular but not intracellular Ca 2+ . Moreover, Ag (I) strongly induced Ca 2+ -dependent CL oxidation and intracellular ATP depletion, both of which were blocked by thiol reagents. These results suggest that Ag (I) activates thiol-dependent Ca 2+ channels, thereby promoting Ca 2+ -dependent CL oxidation, cyt c release, and ATP depletion. This necrotic cell death may play roles in Ag-induced inflammation and autoimmune disorders.
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Ca2+-dependent mast cell death induced by Ag (I) via cardiolipin oxidation and ATP depletion
Inoue, Toshio; Suzuki, Yoshihiro; Yoshimaru, Tetsuro; Ra, Chisei
Follow Journal of Leukocyte Biology
, Volume 86 (1): 167
Fed of American Socs for Experimental Biology – Jul 1, 2009
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