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Journal of Neurophysiology, Vol 76, Issue 5 2896-2906, Copyright © 1996 by APS
ARTICLES |
H. Tsubokawa and W. N. Ross
Department of Physiology, New York Medical College, Valhalla 10595, USA.
1. We studied the effects of synaptic inhibition on backpropagating Na+ spikes in the apical dendrites of CA1 pyramidal neurons in transverse slices from the rat hippocampus. Action potentials were evoked synaptically by stimulation in the stratum radiatum or antidromically by stimulation in the alveus. 2. Inhibitory postsynaptic potentials, evoked by stimulation in the stratum lacunosum moleculare, reduced the amplitude of single spikes in the distal dendrites but did not change the amplitudes in the somatic or proximal regions. Inhibition also reduced the spike-associated [Ca2+]i changes in the distal dendrites but had little effect on the changes in the proximal part of the cell. Both of these results are consistent with inhibition converting actively backpropagating spikes into passively spreading potentials at some point in the arbor. 3. In most cells, the spike amplitude reduction in the distal dendrites was blocked by bicuculline methiodide (10 microM) and inhibition was most effective when evoked in a time window < 10 ms preceding the action potential. This suggests that the amplitude reduction was due to a conductance shunt activated by gamma-aminobuturic acid-A (GABAA) receptors. Synaptically evoked GABAB responses were detected but usually did not block spike propagation. 4. Direct hyperpolarization in the distal dendrites was also effective in blocking antidromically evoked spike backpropagation but probably does not contribute when the action potentials are evoked synaptically. 5. This effect of inhibition is different from its usual function in synaptic integration because spike generation and propagation down the axon are not significantly affected. This kind of inhibition might be important in regulating transient [Ca2+]i changes in the dendrites including individual dendritic branches.
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