Recording Network Activity in Spinal Nociceptive Circuits Using Microelectrode Arrays

Jacqueline A Iredale; Jeremy G. Stoddard; Hannah R. Drury; Tyler J. Browne; Augustus Elton; Jessica F. Madden; Robert J. Callister; James S. Welsh; Brett A. Graham

doi:10.3791/62920

Registrazione dell'attività di rete nei circuiti nocicettivi spinali utilizzando array di microel...

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Recording Network Activity in Spinal Nociceptive Circuits Using Microelectrode Arrays

Registrazione dell'attività di rete nei circuiti nocicettivi spinali utilizzando array di microelettrodi

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11:28 min

February 9, 2022

DOI: 10.3791/62920-v

Jacqueline A Iredale¹, Jeremy G. Stoddard², Hannah R. Drury¹, Tyler J. Browne¹, Augustus Elton², Jessica F. Madden¹, Robert J. Callister¹, James S. Welsh², Brett A. Graham¹

¹School of Biomedical Sciences and Pharmacy,University of Newcastle, ²School of Electrical Engineering,University of Newcastle

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Overview

This study outlines the combined use of microelectrode array (MEA) technology and 4-aminopyridine-induced chemical stimulation to investigate nociceptive activity in the spinal cord dorsal horn. The methodology enables the examination of dorsal horn circuit activity and how these networks interact during spinal sensory processing.

Key Study Components

Area of Science

Neuroscience
Electrophysiology
Nociception

Background

Understanding spinal sensory processing is crucial for pain research.
The dorsal horn contains circuits that are pivotal for pain response.
Investigating these circuits can enhance our knowledge of pain mechanisms.
Microelectrode arrays provide high-resolution recordings of circuit activity.

Purpose of Study

To characterize dorsal horn connectivity and function.
To assess the impact of pharmacological agents on spinal sensory circuits.
To bridge knowledge gaps in nociceptive signaling at the network level.

Methods Used

The study utilized the MEA platform for recording circuit activity in spinal slices.
Mouse spinal cord slices were prepared to isolate and investigate the dorsal horn.
4-aminopyridine was applied to stimulate rhythmic activity for analysis.
Detailed protocols outlined surgical preparation, slice cutting, and equilibrium phases.
Data recording was facilitated through electrodes in the MEA well.

Main Results

The approach allows for the recording of significant dorsal horn electrical activity.
4-aminopyridine application induced consistent rhythmic patterns essential for study.
Pharmacological manipulation could reveal effects on signaling pathways.
Network interactions were observed, shedding light on the complex pain processing in the spinal cord.

Conclusions

This study demonstrates a novel application of MEA technology to pain research.
The methodological approach enables better understanding of nociceptive circuits.
Insights gained could inform therapeutic strategies for pain management.

Frequently Asked Questions

What advantages does the MEA technology offer?

MEA technology provides high-resolution, multi-channel recordings of neuronal activity, allowing for comprehensive insights into circuit dynamics.

How is the spinal slice model prepared for recording?

The spinal slice model is prepared through a detailed surgical process involving dissection and isolation of the dorsal horn region.

What type of data can be obtained through this method?

The method enables the collection of electrophysiological data, revealing circuit activity patterns and responses to pharmacological interventions.

How does the drug 4-aminopyridine influence spinal circuits?

4-aminopyridine induces rhythmic activity in spinal circuits, facilitating the assessment of network interactions and signaling disruptions.

Can this methodology be adapted for other types of studies?

Yes, the methodology can be adapted to study various circuits and responses in different neurological contexts or disease models.

What are some limitations of using spinal slices for study?

Spinal slice preparations may not fully capture the in vivo conditions; thus, results should be interpreted with caution regarding their translational relevance.

Viene delineato l'uso combinato della tecnologia microelectrode array e della stimolazione chimica indotta da 4-aminopiridina per studiare l'attività nocicettiva a livello di rete nel corno dorsale del midollo spinale.

La preparazione della fetta spinale MEA 4-AP descritta fornisce una piattaforma per studiare la connettività dei circuiti del corno dorsale e come queste reti interagiscono durante l'elaborazione sensoriale spinale. La metodologia presentata consente di studiare l'attività del circuito del corno dorsale a livello macroscopico regionale di risoluzione. Questa preparazione può essere utilizzata come strumento di screening rapido per valutare la capacità dei composti di interrompere la segnalazione nei circuiti sensoriali spinali.

Questo metodo aiuta a colmare il divario nella nostra comprensione di come l'attività di specifici tipi di cellule e piccoli micro circuiti influenzano grandi popolazioni di neuroni per modellare successivamente l'output delle risposte comportamentali del corno dorsale e, in definitiva, l'esperienza del dolore. Per iniziare, riempire bene il MEA con siero di cavallo per 30 minuti. Dopo aver rimosso il siero, sciacquare accuratamente il MEA cinque volte con acqua distillata fino a quando l'acqua distillata diventa non schiumosa.

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