Evaluation of Hemisphere Lateralization with Bilateral Local Field Potential Recording in Secondary Motor Cortex of Mice

Yunan Chen; Ming Li; Ying Zheng; Li Yang

doi:10.3791/59310

Évaluation de la latéralisation de l'hémisphère avec enregistrement potentiel de terrain local bi...

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Evaluation of Hemisphere Lateralization with Bilateral Local Field Potential Recording in Secondary Motor Cortex of Mice

Évaluation de la latéralisation de l'hémisphère avec enregistrement potentiel de terrain local bilatéral dans le cortex moteur secondaire des souris

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07:03 min

July 31, 2019

DOI: 10.3791/59310-v

Yunan Chen^1,2, Ming Li³, Ying Zheng³, Li Yang¹

¹School of Life Sciences,Guangzhou University, ²Institute for Brain Research and Rehabilitation,South China Normal University, ³School of Life Sciences,South China Normal University

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Overview

This study presents in vivo electrophysiological recordings of local field potentials (LFP) in the bilateral secondary motor cortex (M2) of mice, focusing on hemisphere lateralization. The research investigates synchronization differences between APP/PS1 mice and wild-type (WT) controls, revealing altered brain lateralization potentially linked to Alzheimer's disease.

Key Study Components

Area of Science

Neuroscience
Electrophysiology
Alzheimer's Disease Research

Background

Local field potentials (LFPs) are vital for assessing neuronal activity.
Synchronization is important for understanding hemisphere lateralization.
Alzheimer's disease may alter brain lateralization mechanisms.
The study uses a mouse model (APP/PS1) to explore these changes.

Purpose of Study

To evaluate synchronization levels between left and right M2 in APP/PS1 mice.
To investigate the impact of Alzheimer’s pathology on hemisphere lateralization.
To identify potential biomarkers for Alzheimer's treatments through electrophysiological metrics.

Methods Used

In vivo electrophysiological recording of LFPs in the mouse M2 regions.
APP/PS1 mice and wild-type controls were used to assess lateralization effects.
Coherence and cross-correlation analyses were performed on the captured LFP data.
Electrode placement, quality control, and data acquisition were detailed in the protocol.
Methods included high-pass and low-pass filtering and amplification of signals for analysis.

Main Results

Cross-correlation showed that wild-type mice exhibited significant asymmetry in LFPs, unlike APP/PS1 mice, which had increased synchronization.
The findings indicated higher gamma coherence in APP/PS1 mice, suggesting reduced lateralization.
Electrophysiological alterations may connect to the underlying mechanisms of Alzheimer's disease pathology.

Conclusions

The study demonstrates that altered synchronization in M2 could serve as a marker for Alzheimer's pathology.
Insights may contribute to understanding neuronal mechanisms related to hemisphere lateralization and Alzheimer's disease.
This research highlights the importance of electrophysiological measurements in exploring disease models.

Frequently Asked Questions

What advantages does this technique offer?

This technique allows for direct measurement of neuronal activity and synchronization in live animal models, providing crucial insights into brain function and disease.

How is the biological model implemented?

The study uses APP/PS1 transgenic mice to understand the effects of Alzheimer’s disease on brain lateralization and synchrony in M2 regions.

What outcomes are obtained from this protocol?

The protocol yields electrophysiological data that reflect neuronal synchronization, coherence, and potential lateralization changes in the brain.

How can this method be adapted for other studies?

The methods can be applied to different brain regions or diseases, allowing researchers to explore various aspects of neuronal connectivity and activity.

What are the key considerations when conducting these experiments?

It’s crucial to monitor anesthesia depth carefully and to ensure that all surgical and recording procedures are conducted with precision to obtain reliable data.

What limitations should be recognized?

Limitations include the invasiveness of the procedure and potential variability in responses among different mice, which may affect data interpretation.

Nous présentons l'enregistrement électrophysiologique in vivo du potentiel local de champ (LFP) dans le cortex moteur secondaire bilatéral (M2) des souris, qui peut être appliqué pour évaluer la latéralisation d'hémisphère. L'étude a révélé des niveaux modifiés de synchronisation entre le M2 gauche et droit chez les souris APP/PS1 par rapport aux témoins WT.

Cette technique peut être utilisée pour examiner certaines propriétés de base de l’électrophysiologie interrégionale pour la latéralisation de l’hémisphère, ainsi que la connectivité, la directionnalité et le couplage. La mesure électrophysiologique est une méthode sensible et efficace d’évaluation chez les animaux, les activités neuronales. Ce protocole offre un meilleur moyen de s’intégrer dans la synchronisation des signaux électriques.

La compréhension du mécanisme sous-jacent de la latéralisation altérée possible du cerveau dans la pathogénie de la maladie d’Alzheimer, peut fournir de nouvelles idées sur les biomarqueurs potentiels pour le traitement de la maladie d’Alzheimer. Avant la chirurgie, confirmer la profondeur de l’anesthésie de la souris, en effectuant un pincement de la queue ou de l’orteil avec des forceps. Ensuite, placez la souris dans l’appareil stéréotaxique, et fixez sa tête.

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