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J Neurophysiol 88: 1263-1269, 2002;
0022-3077/02 $5.00
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The Journal of Neurophysiology Vol. 88 No. 3 September 2002, pp. 1263-1269
Copyright ©2002 by the American Physiological Society

Inhibitory Interactions Between Spiny Projection Neurons in the Rat Striatum

Mark J. Tunstall, Dorothy E. Oorschot, Annabel Kean, and Jeffery R. Wickens

Department of Anatomy and Structural Biology and the Neuroscience Research Centre, School of Medical Sciences, University of Otago, Dunedin, New Zealand

Tunstall, Mark J., Dorothy E. Oorschot, Annabel Kean, and Jeffery R. Wickens. Inhibitory Interactions Between Spiny Projection Neurons in the Rat Striatum. J. Neurophysiol. 88: 1263-1269, 2002. The spiny projection neurons are by far the most numerous type of striatal neuron. In addition to being the principal projection neurons of the striatum, the spiny projection neurons also have an extensive network of local axon collaterals by which they make synaptic connections with other striatal projection neurons. However, up to now there has been no direct physiological evidence for functional inhibitory interactions between spiny projection neurons. Here we present new evidence that striatal projection neurons are interconnected by functional inhibitory synapses. To examine the physiological properties of unitary inhibitory postsynaptic potentials (IPSPs), dual intracellular recordings were made from pairs of spiny projection neurons in brain slices of adult rat striatum. Synaptic interactions were found in 9 of 45 pairs of neurons using averages of 200 traces that were triggered by a single presynaptic action potential. In all cases, synaptic interactions were unidirectional, and no bidirectional interactions were detected. Unitary IPSPs evoked by a single presynaptic action potential had a peak amplitude ranging from 157 to 319 µV in different connections (mean: 277 ± 46 µV, n = 9). The percentage of failures of single action potentials to evoke a unitary IPSP was estimated and ranged from 9 to 63% (mean: 38 ± 14%, n = 9). Unitary IPSPs were reversibly blocked by bicuculline (n = 4) and had a reversal potential of -62.4 ± 0.7 mV (n = 5), consistent with GABA-mediated inhibition. The findings of the present study correlate very well with anatomical evidence for local synaptic connectivity between spiny projection neurons and suggest that lateral inhibition plays a significant role in the information processing operations of the striatum.




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