Whole-Cell Patch Clamp Recording in a Substantia Gelatinosa Neuron of a Spinal Cord Slice
JoVE Encyclopedia of Experiments
Neuroscience
0 views • 3:45 min • July 8th, 2025
Place a rat spinal cord slice in a recording chamber and secure it with a tissue anchor.
Perfuse the slice with artificial cerebrospinal fluid.
Under a microscope, identify the translucent substantia gelatinosa or SG region and select a healthy SG neuron.
Position a patch pipette filled with an ionic solution near the neuron.
Apply mild positive pressure to remove any debris from the pipette tip.
Move the pipette towards the neuron.
Then, release the positive pressure to form a dimple on the neuronal membrane, creating a seal.
Alter the holding potential to bring it close to the resting membrane potential, or RMP.
Use brief suction to rupture the membrane, establishing a whole-cell configuration.
At RMP, apply depolarizing electrical pulses.
These pulses open voltage-gated sodium channels, allowing a rapid influx of sodium ions.
This influx of ions triggers an action potential, resulting in neuron firing.
Record the neuron firing patterns.
To conduct whole-cell patch-clamp recordings from substantia gelatinosa or SG neurons, use potassium-ion-based intracellular solutions for recording, while applying cesium cation-based solution only for the recording of inhibitory postsynaptic currents.
Gently move the spinal cord slice to the recording chamber, and then, stabilize it firmly with a u-shaped platinum wire with nylon threads, for optimal slice stability. Steadily perfuse the slice with bubbled ACSF at room temperature, and set the perfusion rate at 2 to 4 milliliters per minute to achieve sufficient oxygenation.
Then, using a low-resolution microscope lens, identify the region of SG neurons as a translucent band. Choose a healthy neuron, characterized by a three-dimensional shape with a bright and smooth membrane, as the target cell, using the high-resolution objective, and adjust it to the center of the video monitor screen.
Fill a micropipette with an appropriate volume of potassium-ion-based or cesium-ion-based intracellular solution. Then, insert the micropipette into the electrode holder, and ensure that the intracellular solution is contacting the silver wire inside the holder. Bring the micropipette into focus, and use the micromanipulator to immerse it into the ACSF. Apply a mild positive pressure to force away any dirt and debris.
Gradually move the micropipette towards the targeted neuron. Once the pipette approaches the neuron, and a very small dimple forms on the neuronal membrane, release the positive pressure to form a gigaseal. Alter the holding potential to minus 70 millivolts, which is close to the physiological resting membrane potential of a cell.
Then, apply a transient and gentle suction to the micropipette to rupture the membrane and create a good whole-cell configuration. Record firing properties by testing the firing pattern of each neuron in current clamp with a series of one-second depolarizing current pulses of 25 to 150 picoamps with 25-picoamp increments at resting membrane potential.
Overview
This article describes a method for conducting whole-cell patch-clamp recordings from substantia gelatinosa (SG) neurons in rat spinal cord slices. The technique involves careful preparation and stabilization of the slice, as well as precise manipulation of the recording pipette to achieve optimal neuronal access.
Key Study Components
Area of Science
- Neuroscience
- Electrophysiology
- Neuronal signaling
Background
- The substantia gelatinosa is a critical region in the spinal cord involved in pain processing.
- Whole-cell patch-clamp techniques allow for detailed study of neuronal properties.
- Understanding SG neuron firing patterns can provide insights into pain mechanisms.
- Proper slice preparation and pipette handling are essential for successful recordings.
Purpose of Study
- To establish a reliable method for recording from SG neurons.
- To analyze the firing patterns of SG neurons under controlled conditions.
- To enhance understanding of neuronal excitability and signaling in pain pathways.
Methods Used
- Preparation of rat spinal cord slices and stabilization in a recording chamber.
- Identification of SG neurons using microscopy.
- Application of whole-cell patch-clamp techniques with appropriate ionic solutions.
- Recording neuronal firing patterns in response to depolarizing electrical pulses.
Main Results
- Successful establishment of whole-cell configurations in SG neurons.
- Characterization of firing patterns in response to varying current pulses.
- Demonstration of action potential generation through sodium ion influx.
- Insights into the excitability of SG neurons and their role in pain signaling.
Conclusions
- The method provides a robust approach for studying SG neuron physiology.
- Findings contribute to the understanding of pain mechanisms at the cellular level.
- Future studies can build on this technique to explore therapeutic targets for pain management.
Frequently Asked Questions
Executive Industry Relevance
Whole-cell patch clamp recording in substantia gelatinosa neurons enables precise interrogation of neuronal excitability and synaptic function in pain-relevant spinal circuits. This technique provides quantitative, reproducible data critical for target validation and mechanistic de-risking in early neuroscience drug discovery. Its integration supports predictive confidence at key inflection points in analgesic portfolio development.
Strategic Applications in Biopharma R&D
Early Discovery & Target Validation
- Enables direct measurement of neuronal firing patterns in disease-relevant spinal cord regions.
- Supports functional validation of pain pathway targets through quantitative electrophysiological outputs.
- Facilitates mechanistic de-risking by isolating specific ionic currents and synaptic responses.
- Provides data for triaging targets based on physiological relevance and response profiles.
Screening & Assay Development
- Establishes validated ex vivo systems for downstream pharmacological screening of candidate compounds.
- Delivers standardized, reproducible readouts of action potential generation and synaptic activity.
- Enables quantitative assessment of compound effects on neuronal excitability and synaptic transmission.
- Supports assay scalability and platform reuse for comparative compound evaluation.
Translational & Preclinical Research
- Aligns with disease-relevant pain models by targeting substantia gelatinosa neurons implicated in nociceptive processing.
- Provides continuity from early discovery through preclinical validation of analgesic mechanisms.
- Enables risk-adjusted advancement decisions based on translationally relevant electrophysiological endpoints.
- Supports identification of translational biomarkers linked to neuronal activity changes.
Pipeline & Workflow Integration
This method anchors the early discovery-to-lead identification continuum for pain and sensory neuroscience programs, providing a bridge from mechanistic hypothesis testing to preclinical candidate evaluation.
- Discovery Biology: Supports hypothesis-driven interrogation of spinal pain circuits and target function.
- Screening: Delivers reproducible, quantitative electrophysiological outputs for compound profiling.
- Analytics: Enables statistical comparison of neuronal firing and synaptic responses across experimental conditions.
- Translational Research: Connects ex vivo findings to in vivo pain models and potential biomarker development.
- Enterprise Reuse: Functions as a reusable platform for iterative target and compound evaluation in neuroscience portfolios.
Operational & Enterprise Impact
- Scientific Value: Increases predictive confidence and reduces mechanistic ambiguity in pain target validation.
- Operational Value: Standardizes electrophysiological workflows for reproducibility and scalability.
- Strategic Value: Informs go/no-go decisions and enhances capital efficiency by de-risking early-stage programs.
- Portfolio Impact: Enables risk-adjusted prioritization and advancement of analgesic candidates.
Implementation Considerations
- Requires specialized electrophysiology expertise and training in patch clamp techniques.
- Demands high-quality microscopy and precision micromanipulation instrumentation.
- Necessitates rigorous cross-team standardization of slice preparation and recording protocols.
- May require adaptation for different animal models or spinal cord regions.
- Dependent on slice viability and neuron health for reliable data acquisition.
Biopharma FAQs
The Ex vivo Preparation of Spinal Cord Slice for the Whole-Cell Patch-Clamp Recording in Motor Neurons During Spinal Cord Stimulation
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Last updated: 22 August 2026