Trans-ACPD-induced Ca2+ signals in cerebellar Purkinje cells. |
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Authors: | I Vranesic A Batchelor B H G?hwiler J Garthwaite C Staub T Kn?pfel |
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Institution: | Brain Research Institute, University of Zürich, Switzerland. |
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Abstract: | A combination of intracellular recording and fluorometric measurements of cytosolic calcium ( Ca2+]i) was used to locate changes in Ca2+]i induced by the specific metabotropic glutamate receptor (mGluR) agonist trans-D,L-1-amino-1,3-cyclopentanedicarboxylic acid (t-ACPD), in Purkinje cells of rat cerebellar slices. Under voltage-clamp conditions, application of t-ACPD (100 microM) induced an inward current accompanied by a large increase in Ca2+]i located primarily in the soma but also, to a lesser degree, in restricted parts of the dendrites. In contrast, elevations of Ca2+]i associated with calcium spikes were confined to the dendrites and inward currents of a similar amplitude induced by (RS)-alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA), an agonist of ionotropic glutamate receptors, did not raise Ca2+]i. |
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