Effect of maprotiline on Ca(2+) movement in human neuroblastoma cells |
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Authors: | Hsu Shu-Shong Chen Wei-Chuan Lo Yuk-Keung Cheng Jin-Shiung Yeh Jeng-Hsien Cheng He-Hsing Chen Jin-Shyr Chang Hong-Tai Jiann Bang-Ping Huang Jong-Khing Jan Chung-Ren |
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Affiliation: | Department of Surgery, Ping Tung Christian Hospital, Ping Tung 900, Taiwan. |
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Abstract: | In human neuroblastoma IMR32 cells, the effect of the anti-depressant maprotiline on baseline intracellular Ca2+ concentrations ([Ca2+]i) was explored by using the Ca2+-sensitive probe fura-2. Maprotiline at concentrations greater than 100 microM caused a rapid rise in [Ca2+]i in a concentration-dependent manner (EC50 = 200 microM). Maprotiline-induced [Ca2+]i rise was reduced by 50% by removal of extracellular Ca2+. Maprotiline-induced [Ca2+]i rises were inhibited by half by nifedipine, but was unaffected by verapamil or diiltiazem. 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 abolished. U73122, an inhibitor of phospholipase C, did not affect maprotiline-induced [Ca2+]i rises. These findings suggest that in human neuroblastoma cells, maprotiline increases [Ca2+]i by stimulating extracellular Ca2+ influx and also by causing intracellular Ca2+ release from the endoplasmic reticulum via a phospholiase C-independent manner. |
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Keywords: | Ca2+ Ca2+ stores Fura-2 IMR32 Maprotiline Neuroblastoma cells |
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