Add time:08/22/2019         Source:sciencedirect.com

Intracellular calcium ions (Ca2+) play important roles in cell functions. Measurements of intracellular calcium ion concentration ([Ca2+]i) are often made with the fura-2 fluorescence recording technique in various preparations including neurons. Fura-2 has, however, a Ca2+-chelating action which complicates the interpretation of experimental results. In this report the chelating action of intracellular fura-2 was studied by means of computer simulations. The chelating action of an endogenous Ca2+-binding protein, calmodulin, was also estimated. Furthermore, whole-cell patch-clamp recordings of calcium currents (ICa) and fura-2 microfluorimetric recordings of [Ca2+]i were simultaneously made from neurons which were acutely dissociated from the rat nucleus basalis. Since Ca3+ influx can be initiated and terminated by using the voltage-clamp technique, the relationship between Ca2+ influx and rapid [Ca2+]i increase was examined. The present theoretical evaluations and experimental results disclosed the relationship between fura-2 and endogenous Ca2+-binding proteins; fura-2 at low concentration (10 μM) did not substantially affect the endogenous Ca2+ buffering mechanisms, but at high concentration (200 μM) effectively buffered cytosolic Ca2+ instead of endogenous Ca2+ buffers. Calcium homeostasis in neurons is furthermore discussed.

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