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Deprecated: Implicit conversion from float 219.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Basic+Clin+Pharmacol+Toxicol 2009 ; 104 (5): 345-51 Nephropedia Template TP
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Cadmium-induced cytosolic Ca2+ elevation and subsequent apoptosis in renal tubular cells #MMPMID19413654
Yeh JH; Huang CC; Yeh MY; Wang JS; Lee JK; Jan CR
Basic Clin Pharmacol Toxicol 2009[May]; 104 (5): 345-51 PMID19413654show ga
Cadmium (Cd2+) is an industrial and environmental metal. The effect of Cd2+ on intracellular free-Ca2+ levels ([Ca2+](i)) and viability in Madin Darby canine kidney cells was explored. Cd2+increased [Ca2+](i) in a concentration-dependent manner with an EC50 of 85 microM. Cd2+-induced Mn2+ entry demonstrated Ca2+ influx. Removal of extracellular Ca2+ decreased the [Ca2+](i) signal by 60%. The [Ca2+](i) signal was inhibited by La3+ but not by L-type Ca2+ channel blockers. In Ca2+-free medium, Cd2+-induced [Ca2+]i signal was abolished by pre-treatment with 1 microM thapsigargin (an endoplasmic reticulum Ca2+pump inhibitor) and 2 microM carbonylcyanide m-chlorophenylhydrazone (CCCP; a mitochondrial uncoupler). Cd2+-induced Ca2+ release was not altered by inhibition of phospholipase C. At concentrations between 10 and 100 microM, Cd2+killed cells in a concentration-dependent manner. The cytotoxic effect of 100 microM Cd2+was reversed by pre-chelating cytosolic Ca2+with BAPTA. Cd2+-induced apoptosis was demonstrated by propidium iodide. Collectively, this study shows that Cd2+ induced a [Ca2+](i) increase in Madin Darby canine kidney cells via evoking Ca2+ entry through non-selective Ca2+ channels, and releasing stored Ca2+ from endoplasmic reticulum and mitochondria in a phospholipase C-independent manner.