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Artifactual voltage response recorded from hair cells with patch-clamp amplifiers
1Department of Physiological and Pharmacological Sciences, University of Pavia, Italy.
Neuroreport
|September 29, 1999
Summary
Patch-clamp amplifiers (PCAs) can distort cell membrane voltage recordings. This study found that PCAs significantly differed from bridge amplifiers (BAs) in measuring pigeon hair cell voltage responses, revealing damped oscillations.
Area of Science:
- Electrophysiology
- Neuroscience
- Otolaryngology
Background:
- Patch-clamp amplifiers (PCAs) are standard for electrophysiological recordings.
- PCAs in current-clamp mode can introduce voltage response distortions.
- Accurate membrane potential measurements are crucial for understanding cellular function.
Purpose of the Study:
- To compare the accuracy of PCAs versus a bridge amplifier (BA) for recording pigeon semicircular canal hair cell voltage responses.
- To characterize the true membrane voltage response of these hair cells.
- To identify potential distortions introduced by PCAs.
Main Methods:
- In situ recording of pigeon semicircular canal hair cells.
- Comparison of voltage responses using two different PCAs and a classic BA.
- Application of positive current steps to elicit voltage responses.
Main Results:
- Significant differences were observed between PCA and BA recordings of hair cell voltage responses.
- PCAs distorted the true membrane voltage response.
- The true response to positive current steps exhibited a strongly damped oscillation, influenced by hair cell location.
Conclusions:
- PCAs can introduce significant artifacts in hair cell voltage recordings.
- A classic bridge amplifier provides a more accurate representation of hair cell membrane potential.
- The spatial location within the crista ampullaris influences the oscillatory dynamics of hair cell voltage responses.
Keywords:
Non-programmatic