Effects of protein synthesis inhibition on memory for active avoidance training

Area of Science:

• Neuroscience
• Biochemistry

Background:

• Brain protein synthesis is essential for memory formation.
• Understanding the role of protein synthesis in memory requires precise control of its inhibition.

Purpose of the Study:

• To investigate the biochemical and behavioral effects of inhibiting brain protein synthesis using anisomycin and acetoxycycloheximide in mice.
• To determine the relationship between the duration of protein synthesis inhibition and memory impairment.

Main Methods:

• Mice were administered low doses of anisomycin and acetoxycycloheximide to achieve sustained inhibition of brain protein synthesis (≥80% for up to 14 hours).
• Trained mice to avoid footshock in a T-maze, using the drugs as amnestic agents.
• Varied acquisition rate and number of training trials to assess amnesia reduction.

Main Results:

• Increased duration of protein synthesis inhibition correlated with a higher percentage of amnesic mice.
• Amnesia could be mitigated by enhancing acquisition rate or increasing training trials.
• Anisomycin induced significant amnesia for both escape and avoidance learning components.
• Injections administered post-training, prolonging inhibition, were critical for inducing amnesia, ruling out acquisition interference.

Conclusions:

• Sustained inhibition of brain protein synthesis significantly impairs memory consolidation in mice.
• These findings highlight the critical role of ongoing protein synthesis in the formation and retention of memories.
• The study provides strong evidence that protein synthesis inhibition post-learning directly impacts memory processes.