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- W2060194815 abstract "In many cell types, receptor stimulation evokes cytosolic calcium oscillations with a frequency that depends on agonist dose. Previous studies demonstrated controversial effects of changing the activity of the endoplasmic reticulum Ca2+-ATPase upon the frequency of oscillations. By numerical simulations, we found that the model of De Young and Keizer (Keizer and De Young, 1994), unlike other models, can explain the observed discrepancies, assuming that the different experiments were performed at different stimulus levels. According to model predictions, partial inhibition of internal calcium pumps is expected to increase frequency at low stimulus strength and should have an opposite effect at strong stimuli. Similar results were obtained using an analytical estimation of oscillation period, based on calcium-dependent channel activation and inactivation. In experiments on HeLa cells, 4 nM thapsigargin increased the frequency of calcium oscillations induced by 1 and 2.5 μM histamine but had no effect on supramaximally stimulated cells. In HEp-2 cells, 2 nM thapsigargin slowed down the rapid, ATP-induced oscillations. Our results suggest that in the investigated cell types, the De Young-Keizer model based on inositol 1,4,5-trisphosphate-dependent calcium-induced calcium release can properly describe intracellular calcium oscillations." @default.
- W2060194815 created "2016-06-24" @default.
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- W2060194815 date "2001-09-01" @default.
- W2060194815 modified "2023-10-13" @default.
- W2060194815 title "Stimulus-Dependent Control of Inositol 1,4,5-Trisphosphate-Induced Ca2+ Oscillation Frequency by the Endoplasmic Reticulum Ca2+-ATPase" @default.
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- W2060194815 doi "https://doi.org/10.1016/s0006-3495(01)75795-5" @default.
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