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

Registro de la actividad de la red en circuitos nociceptivos espinales utilizando matrices de mic...

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Recording Network Activity in Spinal Nociceptive Circuits Using Microelectrode Arrays

Registro de la actividad de la red en circuitos nociceptivos espinales utilizando matrices de microelectrodos

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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.

Se describe el uso combinado de la tecnología de matriz de microelectrodos y la estimulación química inducida por 4-aminopiridina para investigar la actividad nociceptiva a nivel de red en el asta dorsal de la médula espinal.

La preparación de rodaja espinal MEA 4-AP que se describe proporciona una plataforma para estudiar la conectividad de los circuitos del asta dorsal y cómo estas redes interactúan durante el procesamiento sensorial espinal. La metodología presentada permite investigar la actividad del circuito del asta dorsal a un nivel macroscópico de resolución regional. Esta preparación se puede utilizar como una herramienta de detección rápida para evaluar la capacidad de los compuestos para interrumpir la señalización en los circuitos sensoriales espinales.

Este método ayuda a cerrar la brecha en nuestra comprensión de cómo la actividad de tipos celulares específicos y pequeños microcircuitos influyen en grandes poblaciones de neuronas para posteriormente dar forma a la salida de las respuestas de comportamiento del asta dorsal y, en última instancia, a la experiencia del dolor. Para empezar, llene bien el MEA con suero de caballo durante 30 minutos. Después de retirar el suero, enjuague bien el MEA cinco veces con agua destilada hasta que el agua destilada no sea espumosa.

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