Melatonin induces calcium release from CCK-8- and thapsigargin-sensitive cytosolic stores in pancreatic AR42J cells

Journal of Pineal Research
Angel del Castillo-VaqueroAntonio González

Abstract

Melatonin is produced following circadian rhythm with high levels being released at night and has been implicated in the regulation of physiological processes in major tissues, including the pancreas. The aim of our study was to examine the effects of melatonin on intracellular free Ca(2+) concentration ([Ca(2+) ](c)) in AR42J pancreatic cells. Our results show that stimulation of cells with 1 nm cholecystokinin (CCK)-8 led to a transient increase in [Ca(2+) ](c) followed by a decrease towards a value close to the prestimulation level. Melatonin (at the concentrations 1, 10, 100 μm and 1 mm) induced changes in [Ca(2+) ](c) that consisted of single or short lasting spikes in the form of oscillations or slow transient increases followed by a slow reduction towards a value close to the resting level. Depletion of intracellular Ca(2+) stores by stimulation of cells with 1 nm CCK-8 or 1 μm thapsigargin (Tps) blocked Ca(2+) responses evoked by melatonin in the majority of cells. Conversely, prior stimulation of cells with 1 mm melatonin in the absence of extracellular Ca(2+) inhibited Ca(2+) mobilization in response to a secondary application of CCK-8 or Tps. In summary, our results show that melatonin releases Ca(2+) from intracellu...Continue Reading

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Citations

Aug 2, 2013·Journal of Physiology and Biochemistry·Patricia Santofimia-CastañoAntonio González
Jul 30, 2014·Toxicology Letters·Patricia Santofimia-CastañoAntonio Gonzalez
Jun 15, 2015·Journal of Controlled Release : Official Journal of the Controlled Release Society·Jianbo LiZhirong Zhang
Dec 2, 2010·Journal of Pineal Research·Antonio GonzalezGines M Salido
Oct 21, 2016·British Journal of Pharmacology·Wei HuDongjin Wang
Oct 21, 2011·Molecular and Cellular Biochemistry·Lourdes Garcia-SanchezAntonio Gonzalez
Apr 15, 2020·Scientific Reports·Antonio GonzalezGines M Salido
Aug 3, 2014·Molecular and Cellular Biochemistry·Patricia Santofimia-CastañoAntonio Gonzalez

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