# Protocol for evaluating neuronal activity and neurotransmitter release following amyloid-beta oligomer injections into the rat hippocampus

## TL;DR

This paper provides a detailed protocol for studying how amyloid-beta oligomers affect brain activity and neurotransmitter levels in rats, which is relevant to Alzheimer's disease research.

## Contribution

The novelty lies in combining LFP recording and microdialysis in the same animal to study neuronal and neurotransmitter changes after amyloid-beta injections.

## Key findings

- A protocol is described for measuring glutamate and GABA levels after amyloid-beta oligomer injections in rat hippocampus.
- Steps for assembling and implanting electrode-cannula systems for simultaneous LFP and microdialysis are detailed.
- The method allows for in vivo analysis of neuronal activity and neurotransmitter release in the same animal.

## Abstract

In Alzheimer’s disease, there is an imbalance in neurotransmitter release and altered neuronal activation. Here, we present a protocol approach to analyze neuronal activity by combining local field potential (LFP) recording with microdialysis within the same animal. We describe steps for measuring glutamate and GABA levels following hippocampal amyloid-beta oligomer (Aβo) injections in rats. We then detail procedures for assembling the electrode and cannula, surgical implantation and simultaneous in vivo LFP recording, interstitial fluid collection, and Aβo injections.

•Protocol for analyzing neuronal hyperactivity and neurotransmitters in the same animal•Instructions for the preparation of amyloid-beta oligomers (1–42)•Guidance on the assembly of the cannula and electrode•Procedures for surgical implantation of the assembly complex

Protocol for analyzing neuronal hyperactivity and neurotransmitters in the same animal

Instructions for the preparation of amyloid-beta oligomers (1–42)

Guidance on the assembly of the cannula and electrode

Procedures for surgical implantation of the assembly complex

Publisher’s note: Undertaking any experimental protocol requires adherence to local institutional guidelines for laboratory safety and ethics.

In Alzheimer’s disease, there is an imbalance in neurotransmitter release and altered neuronal activation. Here, we present a protocol approach to analyze neuronal activity by combining local field potential (LFP) recording with microdialysis within the same animal. We describe steps for measuring glutamate and GABA levels following hippocampal amyloid-beta oligomer (Aβo) injections in rats. We then detail procedures for assembling the electrode and cannula, surgical implantation and simultaneous in vivo LFP recording, interstitial fluid collection, and Aβo injections.