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Science 2 August 1996:
Vol. 273. no. 5275, pp. 648 - 650
DOI: 10.1126/science.273.5275.648
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Reports

Presynaptic Long-Term Depression at the Hippocampal Mossy Fiber--CA3 Synapse

Katsunori Kobayashi, Toshiya Manabe, * Tomoyuki Takahashi

Long-term potentiation (LTP) and long-term depression (LTD) of synaptic strength may underlie learning and memory in the brain. The induction of LTP occurs in postsynaptic cells in the hippocampal CA1 region but is presynaptic in CA3. LTD is also well characterized in CA1 but not in CA3. Low-frequency stimulation of mouse hippocampal slices caused homosynaptic LTD at the mossy fiber--CA3 synapse, which may be induced presynaptically by activation of metabotropic glutamate receptors. Thus, the efficacy of mossy fiber--CA3 synapses can be regulated bidirectionally, which may contribute to neuronal information processing.

Department of Neurophysiology, Institute for Brain Research, Faculty of Medicine, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113, Japan.
*   To whom correspondence should be addressed.


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Science. ISSN 0036-8075 (print), 1095-9203 (online)