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Time-dependent effects of treadmill exercise on aversive memory and cyclooxygenase pathway function
Gisele Agustini Lovatel1, Karine Bertoldi, Viviane Rostirola Elsner
1Programa de Pós-Graduação em Ciências Biológicas: Neurociências, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil.
Neurobiology of Learning and Memory
|June 26, 2012
Summary
Treadmill exercise enhances aversive memory and brain function by influencing the cyclooxygenase-2 (COX-2) pathway. These effects on memory and COX-2, prostaglandin E2 (PGE2), and E-prostanoid receptors are time-dependent following exercise cessation.
Area of Science:
- Neuroscience
- Exercise Physiology
- Molecular Biology
Background:
- Exercise is known to improve cognitive functions like learning and memory.
- The cyclooxygenase-2 (COX-2) pathway plays a crucial role in memory formation.
- The temporal dynamics of exercise-induced memory enhancements remain under-investigated.
Purpose of the Study:
- To investigate the impact of treadmill exercise on aversive memory in rats.
- To examine the time-dependent changes in COX-2, prostaglandin E2 (PGE2), and E-prostanoid receptor (EP) levels in the hippocampus post-exercise.
Main Methods:
- Adult male Wistar rats were subjected to a 2-week treadmill exercise protocol or kept sedentary.
- Aversive memory was assessed using the inhibitory avoidance task.
- Levels of COX-2, PGE2, EP1, EP2, EP3, and EP4 receptors were measured at 1h, 18h, 3 days, and 7 days after the final exercise session.
Main Results:
- Treadmill exercise acutely enhanced inhibitory avoidance memory performance and increased COX-2 and EP4 receptor levels.
- A positive correlation was observed between memory performance and COX-2 levels.
- By 7 days post-exercise, increased EP2 content correlated with decreased PGE2 levels.
Conclusions:
- Treadmill exercise facilitates the consolidation of inhibitory avoidance memory.
- Exercise induces time-dependent alterations in the COX-2/PGE2/EP receptor pathway within the hippocampus.
- These findings highlight the temporal interplay between exercise, memory, and specific molecular pathways in the brain.
