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Published on: March 11, 2011
Learning induces long-term potentiation in the hippocampus
Jonathan R Whitlock1, Arnold J Heynen, Marshall G Shuler
1Howard Hughes Medical Institute, Picower Institute for Learning and Memory, Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
Science (New York, N.Y.)
|August 26, 2006
Summary
Learning to avoid danger in rats triggers long-term potentiation (LTP) in the hippocampus. This study demonstrates that this learning process induces the same synaptic changes as high-frequency stimulation (HFS), confirming LTP in CA1 during memory formation.
Area of Science:
- Neuroscience
- Synaptic Plasticity
- Memory Formation
Background:
- Long-term potentiation (LTP) is a key mechanism for memory.
- High-frequency stimulation (HFS) is used to induce LTP in the hippocampus.
- It was unknown if learning itself could induce LTP in the CA1 region.
Purpose of the Study:
- To determine if inhibitory avoidance learning induces LTP in the hippocampal CA1 region.
- To investigate the synaptic changes associated with learning-induced LTP.
- To compare learning-induced LTP with HFS-induced LTP.
Main Methods:
- One-trial inhibitory avoidance learning in rats.
- Measurement of hippocampal glutamate receptor changes.
- In vivo assessment of evoked synaptic transmission amplitude in CA1.
- Occlusion experiments to compare learning-induced and HFS-induced LTP.
Main Results:
- Inhibitory avoidance learning induced changes in hippocampal glutamate receptors similar to HFS.
- Learning caused a spatially restricted increase in synaptic transmission amplitude in CA1.
- The synaptic potentiation from learning occluded HFS-induced LTP.
Conclusions:
- Inhibitory avoidance training in rats induces long-term potentiation (LTP) in the hippocampal CA1 region.
- Learning-induced LTP shares mechanisms with HFS-induced LTP.
- This provides direct evidence that learning can induce LTP in CA1, supporting its role in memory formation.
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