Current Clamp
Current Clamp - Related Videos
09:40
Isolation of Sensory Neurons of Aplysia californica for Patch Clamp Recordings of Glutamatergic Currents
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Cited by 5 •
2013
We describe the dissection of the nervous system of the marine sea hare Aplysia after anesthesia, the isolation of neurons for short term-tissue culture, and recordings of single cell ion currents via the patch clamp technique.
03:45
Applying Noise Currents to Medial Vestibular Nucleus Neurons Using Whole-Cell Patch-Clamp Technique
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2025
This video demonstrates a protocol involving the application of subthreshold noise currents to medial vestibular nucleus neurons using the whole-cell patch-clamp technique to study the impact of the noise currents on neuronal sensitivity to electrical stimuli.
04:20
Amphotericin-B Mediated Perforated Patch-Clamp Analysis: An Electrophysiological Technique to Study Ionic Currents in Urinary Bladder Cells
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2023
This video demonstrates the characterization of cationic currents from transient receptor potential melastatin type 4 (TRPM4) ion channels in detrusor smooth muscle cells using amphotericin-B mediated perforated patch-clamp technique. The technique helps evaluate the biophysical and pharmacological properties of ion channels.
09:43
Patch Clamp Electrophysiology
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2023
Neuron cell membranes are populated with ion channels that control the movement of charge into and out of the cell, thereby regulating neuron firing. One extremely useful technique for investigating the biophysical properties of these channels is called patch clamp recording. In this method, neuroscientists place a polished glass micropipette against a cell and apply suction to form a high resistance seal. This process isolates a small “patch” of membrane that contains one or more ion channels.
08:11
Voltage-Dependent Potassium Current Recording on H9c2 Cardiomyocytes via the Whole-Cell Patch-Clamp Technique
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Cited by 1 •
2022
The present protocol describes an efficient method for the real-time and dynamic acquisition of voltage-gated potassium (Kv) channel currents in H9c2 cardiomyocytes using the whole-cell patch-clamp technique.
FAQs
A positive injected current generally drives membrane potential toward depolarization, whereas a negative current can produce hyperpolarization. The resulting voltage trace can be examined for whether and when action potentials occur. This links the imposed electrical stimulus to measurable changes in excitability, allowing comparisons across recording conditions.
Ion channels influence how a neuron converts injected current into membrane-voltage changes and action-potential firing. Comparing responses before and after a channel-modifying condition can therefore reveal changes in neuronal excitability. This approach helps connect channel activity with functional effects on individual neurons and, when relevant, broader neural signaling.
Steady current provides a controlled condition for examining sustained depolarization or hyperpolarization and determining whether firing occurs. Time-varying current instead tests how voltage responses and action-potential activity follow changing electrical input. Using both forms can expose different features of neuronal responsiveness and support comparisons across experimental conditions.
Responses to injected current provide information about a neuron’s intrinsic membrane behavior, including its firing threshold and tendency to generate action potentials. Voltage responses can also be examined in the context of synaptic integration, showing how inputs combine to influence neuronal output. Together, these measurements connect cellular properties with signaling in neural circuits.
A recording electrode is placed to interact electrically with the cell, while an amplifier is configured to apply a defined current and record the resulting membrane potential. The experimenter can deliver steady or time-varying current, observe depolarization, hyperpolarization, and firing, then compare voltage responses across selected conditions.
Comparisons are useful when testing how neurotransmitters, drugs, ion-channel changes, or disease-related conditions alter neuronal signaling. Researchers examine differences in voltage responses, firing thresholds, or action-potential activity between conditions. These contrasts can identify whether a manipulation changes cellular excitability or affects how neurons process electrical and synaptic inputs.
At the cellular level, recordings can show how individual neurons respond to electrical input and whether they reach firing threshold. When interpreted within circuit experiments, these responses help assess synaptic integration and neuronal output. The resulting data connect membrane-potential behavior with changes in signaling and network function.