Electrophysiological Investigations of Retinogeniculate and Corticogeniculate Synapse Function

Xufeng Chen; Danni Wang; Marcel Kegel; Jakob von Engelhardt

doi:10.3791/59680

Indagini elettrofisiologiche sulla funzione di sinapla Retinogeniculate e Corticogeniculate

JoVE Journal
Neuroscience

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JoVE Journal Neuroscience

Electrophysiological Investigations of Retinogeniculate and Corticogeniculate Synapse Function

Indagini elettrofisiologiche sulla funzione di sinapla Retinogeniculate e Corticogeniculate

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09:09 min

August 7, 2019

DOI: 10.3791/59680-v

Xufeng Chen¹, Danni Wang¹, Marcel Kegel¹, Jakob von Engelhardt¹

¹Institute of Pathophysiology,University Medical Center of the Johannes Gutenberg University Mainz

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Overview

This study presents protocols for preparing acute brain slices of the lateral geniculate nucleus and conducting electrophysiological investigations of retinogeniculate and corticogeniculate synapse functions. The methodology allows for separate stimulations of the distinct retinal and cortical inputs, providing insights into their differing functional properties.

Key Study Components

Area of Science

Neuroscience
Electrophysiology
Synaptic Function

Background

The lateral geniculate nucleus is critical for visual processing.
Understanding the distinct properties of retinogeniculate and corticogeniculate synapses is fundamental in neuroscience.
This protocol enables the simultaneous study of synapses with high and low release probability.

Purpose of Study

To provide a reliable method for analyzing synaptic functions in brain slices.
To enhance understanding of the functional characteristics of different synaptic pathways.
To facilitate the investigation of synaptic plasticity within the lateral geniculate nucleus.

Methods Used

Ex vivo brain slices were prepared from the lateral geniculate nucleus.
The biological model includes retinogeniculate and corticogeniculate synapses in acute brain slices.
No multiomics workflows were mentioned in the text.
Key steps include careful dissection, cooling, and slice preparation for electrophysiological recordings.
Recording and stimulating pipettes were used to monitor synaptic function.

Main Results

The study demonstrates the ability to investigate separate retinal and cortical synaptic inputs effectively.
Mechanistic insights regarding synaptic functionalities were observed.
Retinogeniculate synapses exhibited distinct characteristics compared to corticogeniculate synapses.

Conclusions

This study enables detailed examination of synaptic interactions in the lateral geniculate nucleus.
Findings contribute to a greater understanding of neuronal mechanisms and synaptic plasticity in visual processing.
The protocols established can aid future investigations into related neurological conditions.

Frequently Asked Questions

What advantages does this protocol offer for studying synapses?

The protocol allows for the simultaneous investigation of retinogeniculate and corticogeniculate synapses, which have unique functional properties, providing comprehensive insights.

How is the acute brain slice prepared for experiments?

Slices are prepared by careful dissection and sectioning of the brain to maintain the integrity of the thalamic inputs before conducting electrophysiological recordings.

What types of data are obtained from this method?

The primary outcomes include electrophysiological data on synaptic responses, as well as insights into the release probability of different synapse types.

Can this method be adapted for other regions of the brain?

Yes, the protocols can be modified to study other brain regions by adjusting dissection techniques and recording parameters based on specific regional properties.

What limitations should researchers consider when using this protocol?

Potential limitations include the precise dissection required to maintain synaptic integrity and the need for specialized equipment for electrophysiological recordings.

Qui presentiamo protocolli per la preparazione di fette cerebrali acute contenenti il nucleo genetico laterale e l'indagine elettrofisiologica della funzione sinapsi retinogenica e corticogena. Questo protocollo fornisce un modo efficiente per studiare le sinapsi con la probabilità ad alto rilascio e basso rilascio nelle stesse fette cerebrali acute.

Qui presentiamo i protocolli per la preparazione di fette cerebrali acute contenenti il nucleo geniculato laterale e l'indagine elettrofisiologia del genicolo retinico e della funzione sinapsi genicolata corticale. Gli assoni delle cellule gangliari retiniche entrano nel nucleo geniculato laterale lontano dagli ingressi corticali. Ciò consente le stimolazioni separate del geniculato retinale e delle sinapsi genicolate corticali, che hanno proprietà funzionali molto diverse.

Per iniziare questa procedura, preparare due camere a fette, una riempita con 100 millilitri della soluzione di dissezione e l'altra con 100 millilitri di soluzione di registrazione. Mettere i due becher in un bagno d'acqua a 37 gradi Celsius e far bollire le soluzioni con carbogeno per almeno 15 minuti prima della dissezione. Quindi riempire un becher di plastica con 250 millilitri di soluzione di dissezione quasi ghiacciata e bollarlo con carbogeno per almeno 15 minuti prima dell'uso.

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