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- W3628071 abstract "This abstract reports the effect of HgCl/sub 2/ on cytosolic ionized calcium (Ca/sup 2 +/)/sub c/, measured by the fluorescent chelator Fura-2, in trypsinized rabbit renal tubular cells at 37/sup 0/C in Hanks salt solution, pH 7.2, containing 1.37 mM CaCl/sub 2/. Viability measured fluorometrically with propidium iodide correlated well with that determined using trypan blue. HgCl/sub 2/ (1-10 ..mu..M) induced rapid and dose-dependent increases up to 5-fold normal (Ca/sup 2 +/)/sub c/. After 1-3 min the rate of increase slowed or stopped. At higher doses of HgCl/sub 2/ (20-100 ..mu..M) an unexpected pattern of (Ca/sup 2 +/)/sub c/ changes occurred. After an initial 5-6-fold increase by 1 min, (Ca/sup 2 +/)/sub c/ decreased in the next 2-3 min to 2-3-fold normal levels. This change was followed by a second increase of (Ca/sup 2 +/)/sub c/ at a much slower rate which did appear to be dose-related. Calcium channel blockers and calmodulin inhibitors had little or no effect. Inhibitors of mitochondrial function, antimycin and 2,4-dinitrophenol, interfered with the fluorescent assay; KCN totally inhibited HgCl/sub 2/-induced (Ca/sup 2 +/)/sub c/ changes while hypoxia had no apparent effect. The -SH group binding compound N-ethyl maleimide increased (Ca/sup 2 +/)/sub c/ 4-5 fold;more » addition of 25 ..mu..M Hg caused faster peaking and recovery of (Ca/sup 2 +/)/sub c/. The mechanism of Ca/sup 2 +/ buffering triggered by higher HgCl/sub 2/ concentrations is as yet unknown.« less" @default.
- W3628071 created "2016-06-24" @default.
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- W3628071 date "1986-05-01" @default.
- W3628071 modified "2023-09-28" @default.
- W3628071 title "Fura-2 measurement of cytosolic calcium in HgCl/sub 2/-treated rabbit renal turbular cells" @default.
- W3628071 hasPublicationYear "1986" @default.
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