Acute brain-slice whole-cell patch-clamp recording
Materials Required
Principle
Acute brain-slice whole-cell patch-clamp recording measures membrane voltage or ionic current from visually targeted cells in living brain slices; after giga-seal formation, the membrane under the pipette is ruptured to provide low-resistance electrical access to the cell interior, enabling current-clamp analysis of excitability and voltage-clamp analysis of synaptic or membrane currents[1][2][3]. Acute slices preserve local tissue architecture better than dissociated preparations and allow visually guided recording from defined brain regions or fluorescently labeled cells; however, whole-cell access also permits exchange between pipette solution and cytoplasm, so intracellular dialysis must be considered when interpreting signaling-dependent phenomena[2][3].
MCE has not independently verified the accuracy of these methods. They are for reference only.
Experimental Materials
• Use oxygenated artificial cerebrospinal fluid for slicing, recovery, holding, and perfusion; published protocols report standard aCSF, sucrose-based protective solutions, and NMDG-based protective recovery solutions, with the choice depending on animal age, brain region, and slice viability requirements[3][4][5][6][7].
• Use intracellular pipette solution formulated for the recording mode; potassium-based internal solutions are commonly used for current-clamp recordings, whereas cesium-based internal solutions are commonly used for voltage-clamp recordings of synaptic currents[3][8].
• No antibody is required for the electrophysiological recording itself; fluorescent reporters or dyes may be used when the literature-supported goal is targeted recording from labeled cells or post hoc morphological and immunohistochemical identification[3][7][9].
• Use a vibrating tissue slicer to prepare acute brain slices, a microscope with transmitted infrared/DIC or fluorescence capability for visual targeting, a recording chamber with continuous perfusion, glass patch pipettes, a micromanipulator, patch-clamp amplifier, digitizer, acquisition software, oxygenation system, temperature control when required, and vibration/electrical-noise isolation[2][3][7][8].
• Use intracellular pipette solution formulated for the recording mode; potassium-based internal solutions are commonly used for current-clamp recordings, whereas cesium-based internal solutions are commonly used for voltage-clamp recordings of synaptic currents[3][8].
• No antibody is required for the electrophysiological recording itself; fluorescent reporters or dyes may be used when the literature-supported goal is targeted recording from labeled cells or post hoc morphological and immunohistochemical identification[3][7][9].
• Use a vibrating tissue slicer to prepare acute brain slices, a microscope with transmitted infrared/DIC or fluorescence capability for visual targeting, a recording chamber with continuous perfusion, glass patch pipettes, a micromanipulator, patch-clamp amplifier, digitizer, acquisition software, oxygenation system, temperature control when required, and vibration/electrical-noise isolation[2][3][7][8].
Experimental Procedure
• Prepare slicing, recovery, holding, and recording solutions before dissection, equilibrate bicarbonate-buffered solutions with carbogen, and select the slicing strategy according to the validated preparation: ice-cold protective solutions, NMDG protective recovery, or near-physiological-temperature slicing have all been reported, but protocol choice should be empirically optimized for the specific brain region and animal age[4][5][6][7].
• Deeply anesthetize the animal according to approved animal-use procedures, rapidly remove the brain or perform literature-supported intracardiac perfusion when used by the selected protocol, mount the brain for the desired plane, and cut acute slices with a vibrating slicer; reported mouse slice protocols commonly use approximately 250-350 µm sections for patch-clamp experiments[4][5][7][8].
• Recover slices in oxygenated holding solution using the temperature and recovery conditions specified by the selected slicing method; NMDG protective recovery and adult-slice methods were developed to improve neuronal preservation and targeted patch-clamp success in adult or difficult tissue, whereas warm slicing around physiological temperature has been reported to improve slice quality in some adult preparations[4][5][6].
• Transfer one slice to the recording chamber, secure it with a slice anchor, continuously perfuse oxygenated recording aCSF, identify the target region and cell visually, and approach the cell with a clean glass pipette filled with internal solution[2][3][8].
• Apply positive pressure during approach, release pressure at the cell surface, form a high-resistance seal, rupture the membrane patch to enter whole-cell mode, and allow the recording to stabilize before collecting data; the classic thin-slice method included localized cleaning of the soma to expose membrane for high-resistance seal formation[1][2][3].
• For current-clamp experiments, inject defined current steps and record membrane-potential responses, resting membrane potential, input resistance, action-potential threshold, firing frequency, and firing pattern; for voltage-clamp experiments, hold the cell at defined command potentials and record evoked, spontaneous, or pharmacologically isolated synaptic or membrane currents[3][8].
• Monitor recording quality throughout acquisition by tracking access resistance, membrane resistance, holding current, and baseline stability; recordings with unstable access or leak should be excluded according to predefined criteria reported in the experimental study[3][8].
• Analyze current-clamp data as voltage responses to injected current and voltage-clamp data as current responses to voltage commands or synaptic stimulation; when pharmacology, optogenetics, calcium imaging, dye filling, or post hoc cell identification is used, interpret electrophysiological data together with the targeted manipulation or anatomical identity[3][4][7][9].
• Use biological replicates from independent animals or preparations and technical replicates from multiple cells or slices only when the study design supports that hierarchy; report animal number, slice number, cell number, inclusion criteria, and statistical treatment to avoid treating non-independent cells as independent biological replicates[3][8][9].
• Deeply anesthetize the animal according to approved animal-use procedures, rapidly remove the brain or perform literature-supported intracardiac perfusion when used by the selected protocol, mount the brain for the desired plane, and cut acute slices with a vibrating slicer; reported mouse slice protocols commonly use approximately 250-350 µm sections for patch-clamp experiments[4][5][7][8].
• Recover slices in oxygenated holding solution using the temperature and recovery conditions specified by the selected slicing method; NMDG protective recovery and adult-slice methods were developed to improve neuronal preservation and targeted patch-clamp success in adult or difficult tissue, whereas warm slicing around physiological temperature has been reported to improve slice quality in some adult preparations[4][5][6].
• Transfer one slice to the recording chamber, secure it with a slice anchor, continuously perfuse oxygenated recording aCSF, identify the target region and cell visually, and approach the cell with a clean glass pipette filled with internal solution[2][3][8].
• Apply positive pressure during approach, release pressure at the cell surface, form a high-resistance seal, rupture the membrane patch to enter whole-cell mode, and allow the recording to stabilize before collecting data; the classic thin-slice method included localized cleaning of the soma to expose membrane for high-resistance seal formation[1][2][3].
• For current-clamp experiments, inject defined current steps and record membrane-potential responses, resting membrane potential, input resistance, action-potential threshold, firing frequency, and firing pattern; for voltage-clamp experiments, hold the cell at defined command potentials and record evoked, spontaneous, or pharmacologically isolated synaptic or membrane currents[3][8].
• Monitor recording quality throughout acquisition by tracking access resistance, membrane resistance, holding current, and baseline stability; recordings with unstable access or leak should be excluded according to predefined criteria reported in the experimental study[3][8].
• Analyze current-clamp data as voltage responses to injected current and voltage-clamp data as current responses to voltage commands or synaptic stimulation; when pharmacology, optogenetics, calcium imaging, dye filling, or post hoc cell identification is used, interpret electrophysiological data together with the targeted manipulation or anatomical identity[3][4][7][9].
• Use biological replicates from independent animals or preparations and technical replicates from multiple cells or slices only when the study design supports that hierarchy; report animal number, slice number, cell number, inclusion criteria, and statistical treatment to avoid treating non-independent cells as independent biological replicates[3][8][9].
Troubleshooting
Problem: Poor slice health or swollen superficial neurons.
• Possible cause: The slicing and recovery method is not suited to the animal age or brain region.• Literature-supported solution: Use an empirically validated protective slicing/recovery approach such as NMDG protective recovery for adult or difficult tissue, or evaluate near-physiological-temperature slicing when supported for the target preparation[4][5][6][7].
Problem: Difficulty obtaining a giga-seal.
• Possible cause: Damaged or obstructed membrane surface, poor tissue quality, or unsuitable pipette approach.• Literature-supported solution: Use visually guided targeting in healthy slices, maintain clean pipette tips and positive pressure during approach, and, where necessary, gently clean the soma surface as described in the thin-slice patch-clamp method[2][3].
Problem: Recording instability after whole-cell access.
• Possible cause: Deteriorating access resistance, excessive leak, or poor mechanical/electrical stability.• Literature-supported solution: Continuously monitor access resistance and baseline parameters, discard unstable recordings according to predefined criteria, and maintain a stable perfused recording chamber and low-noise patch-clamp setup[3][8].
Problem: Loss of signaling-dependent responses during prolonged recording.
• Possible cause: Whole-cell dialysis caused by exchange between pipette solution and cytoplasm.• Literature-supported solution: Interpret time-dependent intracellular signaling experiments cautiously and use recording durations and internal-solution composition appropriate to the biological question[3].
References:
- [1]. Hamill OP, et al. Improved patch-clamp techniques for high-resolution current recording from cells and cell-free membrane patches. Pflugers Arch. 1981;391(2):85-100. [Content Brief]
- [2]. Edwards FA, et al. A thin slice preparation for patch clamp recordings from neurones of the mammalian central nervous system. Pflugers Arch. 1989;414(5):600-612. [Content Brief]
- [3]. Segev A, et al. Whole-cell Patch-clamp Recordings in Brain Slices. J Vis Exp. 2016;(112):e54024. [Content Brief]
- [4]. Ting JT, et al. Acute brain slice methods for adult and aging animals: application of targeted patch clamp analysis and optogenetics. Methods Mol Biol. 2014;1183:221-242. [Content Brief]
- [5]. Ting JT, Lee BR, Chong P, Soler-Llavina G, Cobbs C, Koch C, et al. Preparation of Acute Brain Slices Using an Optimized N-Methyl-D-glucamine Protective Recovery Method. J Vis Exp. 2018;(132):e53825. [Content Brief]
- [6]. Huang S, et al. Physiological temperature during brain slicing enhances the quality of acute slice preparations. Front Cell Neurosci. 2013;7:48. [Content Brief]
- [7]. Pavón Arocas O, et al. Preparation of acute midbrain slices containing the superior colliculus and periaqueductal Gray for patch-clamp recordings. PLoS One. 2022;17(8):e0271832. [Content Brief]
- [8]. Chen H, et al. Whole-cell patch clamp and extracellular electrophysiology recordings in mouse brain slices. STAR Protoc. 2025;6(3):104008. [Content Brief]
- [9]. Kamen Y, et al. Combining whole-cell patch clamp and dye loading in acute brain slices with bulk RNA sequencing in embryonic to aged mice. STAR Protoc. 2021;2(2):100439. [Content Brief]
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