Abstract
In Madin-Darby canine kidney (MDCK) cells, the effect of maprotiline, an antidepressant, on intracellular Ca2+ concentration ([Ca2+]i) was measured using fura-2. Maprotiline (>2.5 µM) caused a rapid rise of [Ca2+]i in a concentration-dependent manner (EC50 200 µM). Maprotiline-induced [Ca2+]i rise was reduced by removal of extracellular Ca2+ or by addition of La3+, but was not altered by voltage-gated Ca2+-channel blockers. Maprotiline-induced Mn2+ influx-associated fura-2 fluorescence quench directly suggests that maprotiline caused Ca2+ influx. In Ca2+-free medium, thapsigargin, an inhibitor of the endoplasmic reticulum Ca2+-ATPase, caused a monophasic [Ca2+]i rise, after which the increasing effect of maprotiline on [Ca2+]i was nearly abolished; also, pretreatment with maprotiline reduced a portion of thapsigargin-induced [Ca2+]i rise. U73122, an inhibitor of phospholipase C, abolished [Ca2+]i rise induced by ATP (but not by maprotiline). Overnight incubation with 1–10 µM maprotiline enhanced cell viability, but 20–50 µM maprotiline decreased it. These findings suggest that maprotiline rapidly increases [Ca2+]i in renal tubular cells by stimulating both extracellular Ca2+ influx and intracellular Ca2+ release, and may modulate cell proliferation in a concentration-dependent manner.
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This work was supported by grants from Veterans General Hospital Kaohsiung (VGHKS93-21) and grants NSC92-2320-B-075B-003 to C.-R. Jan, and VGHKS93-92 to S.-S. Hsu.
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Hsu, SS., Chen, WC., Jiann, BP. et al. Effect of the antidepressant maprotiline on calcium movement and the viability of renal tubular cells. Arch Toxicol 78, 453–459 (2004). https://doi.org/10.1007/s00204-004-0564-1
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DOI: https://doi.org/10.1007/s00204-004-0564-1