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Changes in Physiological and Pathological Behaviours Produced by Deep Microelectrode Implantation Surgery in Rats: A
Gustavo A Chiprés-Tinajero1, Miguel A Núñez-Ochoa1, Laura Medina-Ceja1
1Laboratory of Neurophysiology, Department of Cellular and Molecular Biology, CUCBA, University of Guadalajara, Mexico.
Behavioural Neurology
|March 27, 2020
Summary
Deep microelectrode implantation surgery in epileptic rats significantly impacts sleep and exploratory behavior. This neurosurgery also increases the duration and frequency of convulsive seizures, highlighting the need to account for surgical effects in research.
Area of Science:
- Neuroscience
- Animal Behavior
- Epilepsy Research
Background:
- Physiological behaviors like sleep-wake cycles are assumed unaffected by neurosurgery.
- Limited data exists on the behavioral and cognitive impacts of deep microelectrode implantation in animal models of neurological diseases.
- The influence of surgery on pathological phenomena in these models is often underestimated.
Purpose of the Study:
- To analyze the temporal effects of deep microelectrode implantation surgery in the rat hippocampus.
- To assess the impact of surgery on quiet wakefulness, sleep, exploratory activity, and convulsive seizures (Racine scale).
- To investigate the relationship between Fast Ripples (FR) and seizure events post-surgery.
Main Methods:
- Male Wistar rats were used, divided into sham and epileptic groups.
- Epileptic seizures were induced using pilocarpine hydrochloride via intracerebroventricular injection.
- Deep microelectrode implantation was performed, followed by analysis of physiological and pathological behaviors via 24/7 video monitoring.
Main Results:
- Surgery significantly altered sleep patterns in epileptic rats.
- A decrease in exploratory activity was observed, correlating with sleep changes.
- Post-surgery, an increase in the duration and frequency of scale 4 and 5 seizures was noted.
- No significant correlation was found between Fast Ripples and seizure events.
Conclusions:
- Deep microelectrode implantation surgery modifies both physiological and pathological behaviors in animal models.
- These surgical effects must be considered when interpreting results from studies using animal models of neurological diseases.
- The study underscores the importance of accounting for surgical impact in neuroscientific research.
