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The Journal of Neuroscience, 2002, 22:RC214:1-5

RAPID COMMUNICATION
Variation in Effective Stimulus Patterns for Induction of Long-Term Potentiation Across Different Layers of Rat Entorhinal Cortex

Sung Hwan Yun¹, Inhee Mook-Jung², and Min Whan Jung^{1, 2}

¹ Neuroscience Laboratory, Institute for Medical Sciences and ² Brain Disease Research Center, Ajou University School of Medicine, Suwon 442-721, Korea

Neuronal activities in superficial (II and III) and deep (V and VI) layers of the entorhinal cortex (EC) are preferentially modulated by theta and sharp wave (SPW) EEG, respectively. We investigated the possibility that distinct EEG patterns represent optimal stimulus patterns for induction of long-term potentiation (LTP) in different layers of the EC. We examined effects of three different stimulation patterns on LTP induction in layers I, II-III, and V of medial EC slices of the rat. The stimulation patterns we used were a single, long high-frequency train (1 sec at 100 Hz, repeated 3×), theta burst stimulation [TBS; 10 bursts (four pulses, 100 Hz) at 5 Hz, repeated 3×], and SPW-like burst stimulation [ SPWBS; three bursts (20 pulses, 200 Hz) at 2 Hz, repeated 6×]. Similar degrees of LTP were induced by the three stimulation patterns in layer I. In layers II-III and layer V, however, the largest degrees of LTP were induced by TBS and SPWBS, respectively. These results suggest that burst stimulation constructed to mimic naturally occurring patterns of neuronal activity in the corresponding layer is optimal for LTP induction in layers II-III and layer V of the EC. The differences may play important roles in shaping hippocampal-neocortical interactions in encoding and retrieval of memory.

Key words: long-term potentiation; theta; sharp wave; hippocampus; entorhinal cortex; memory

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Copyright © Society for Neuroscience  0270-6474//$05.00/0

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