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• W2185483637 abstract "The effect of the oxidant t-butyl hydroperoxide on intracellular free levels of Ca2+ ([Ca2+]i) in PC12 pheochromocytoma cells was examined by using fura-2 as a fluorescent dye. t-Butyl hydroperoxide induced an increase in [Ca2+]i in a concentration-dependent fashion between 50-250 microM with an EC50 of 100 microM. The [Ca2+]i signal consisted of a slow rise and a sustained phase. The response was decreased by 65% by removal of extracellular Ca2+. In Ca(2+)-free medium, pretreatment with 1 microM thapsigargin (an endoplasmic reticulum Ca2+ pump inhibitor) abolished 150 microM t-butyl hydroperoxide-induced [Ca2+]i increase, and conversely, pretreatment with t-butyl hydroperoxide abrogated thapsigargin-induced [Ca2+]i increase. The 150 microM t-butyl hydroperoxide-induced [Ca2+]i increase in Ca2+ medium was reduced by 42 +/- 5% by pretreatment with 0.1 microM nicardipine but not by 10 microM verapamil, nifedipine, nimodipine or diltiazem, or by 50 microM La3+ or Ni2+. Pretreatment with 10 microM t-butyl hydroperoxide for 40 min did not affect 10 microM ATP-induced [Ca2+]i increase. Together, the results show that t-butyl hydroperoxide induced significant [Ca2+]i increase in PC12 cells by causing store Ca2+ release from the thapsigargin-sensitive endoplasmic reticulum pool in an inositol 1,4,5-trisphosphate-independent manner and by inducing Ca2+ influx via a nicardipine-sensitive pathway." @default.
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• W2185483637 date "2002-06-30" @default.
• W2185483637 modified "2023-09-23" @default.
• W2185483637 title "Effect of t-butyl hydroperoxide on Ca2+ movement in PC12 pheochromocytoma cells." @default.
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• W2185483637 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/12817717" @default.
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