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Journal of Neurophysiology, Vol 73, Issue 6 2553-2557, Copyright © 1995 by APS
ARTICLES |
B. R. Christie, L. S. Eliot, K. Ito, H. Miyakawa and D. Johnston
Division of Neuroscience, Baylor College of Medicine, Houston, Texas 77030, USA.
1. Intracellular recordings, in conjunction with fura-2 fluorescence imaging, were used to evaluate the contribution of the different Ca2+ channel subtypes to the Ca2+ influx induced by back-propagating trains of action potentials. High-threshold channels contributed mainly to Ca2+ influx in pyramidal cell somata and proximal dendrites, whereas low-threshold and other Ni(2+)-sensitive channels played a greater role in more distal dendritic signaling. These data suggest that the different Ca2+ channel types participate in distinct physiological functions; low-threshold channels likely play a greater role in dendritic integration, whereas high-threshold channels are more important for somatic Ca(2+)-dependent processes.
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