Time Course of Protein Synthesis-Dependent Phase of Olfactory Memory in the Cricket Gryllus bimaculatus(Neurobiology)

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概要

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• The cricket Gryllus bimaculatus forms a stable olfactory memory that lasts for practically a lifetime. As a first step to elucidate the cellular mechanisms of olfactory learning and memory retention in crickets, we studied the dependency of memory retention on the de novo brain protein synthesis by injecting the protein synthesis inhibitor cycloheximide (CHX) into the head capsule. Injection of CHX inhibited ^3H-leucine incorporation into brain proteins by > 90% for 3hr. Crickets were trained to associate peppermint odor with water (reward) and vanilla odor with saline solution (non-reward) and were injected with CHX before or at different times after training. Their odor preferences were tested at 2hr, 1 day and 4 days after training. Memory retention at 2hr after training was unaffected by CHX injection. However, the level of retention at 1 day and 4 days after training was lowered when CHX was injected 1 hour before training or at 1hr or 6hr after training. To study the time course of the development of CHX-sensitive memory phase, crickets that had been injected with CHX at 1hr after training were tested at different times from 2 to 12hr after training. The level of retention was unaffected up to 4hr after training but significantly lowered at 5hr after training, and the CHX-sensitive memory phase developed gradually during the next several hours. CHX dissociates two phases of olfactory memory in crickets: earlier protein synthesis-independent phase (< 4hr) and later (> 5hr) protein synthesis-dependent phase.

• 2003-04-25

著者

• Noji Sumihare

  Department Of Biological Science And Technology Faculty Of Engineering Tokushima University

• Noji Sumihare

  Department Of Bioengineering Tokushima University Faculty Of Engineering

• Mizunami Makoto

  Research Institute For Electronic Science Hokkaido University:graduate School Of Life Sciences Tohok

• Matsumoto Yukihisa

  Research Institute for Electronic Science, Hokkaido University

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