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J Neurophysiol 80: 983-988, 1998;
0022-3077/98 $5.00
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The Journal of Neurophysiology Vol. 80 No. 2 August 1998, pp. 983-988
Copyright ©1998 The American Physiological Society

RAPID COMMUNICATION


Calcium-Dependent Spike-Frequency Accommodation in Hippocampal CA3 Nonpyramidal Neurons

Raymond A. Chitwood and David B. Jaffe

Division of Life Sciences, University of Texas at San Antonio, San Antonio, Texas 78249

Chitwood, Raymond A. and David B. Jaffe. Calcium-dependent spike-frequency accommodation in hippocampal CA3 nonpyramidal neurons. J. Neurophysiol. 80: 983-988, 1998. Interneurons of the hippocampal formation are traditionally identified electrophysiologically as those cells that fire trains of weakly accommodating action potentials in response to depolarizing current injection. We studied the firing properties of nonpyramidal neurons in the five substrata of the CA3b region of hippocampus. With the use of whole cell recording methods we found that nonpyramidal neurons fired in a range from weak to strong spike-frequency accommodation (SFA) that was calcium dependent. Slow afterhyperpolarizations were not associated with strong SFA. In addition a subset of interneurons (~20%) fired with an irregular firing pattern that was generally calcium independent. These results suggest a calcium-dependent mechanism for SFA in nonpyramidal neurons that is distinct from pyramidal cells and further demonstrates the heterogeneity of hippocampal interneurons.




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