Related Experiment Video
Updated: May 21, 2026
06:59
A Fluorescence-Based Assay of Membrane Potential for High-Throughput Functional Study of Two Endogenous Ion Channels in Two Epithelial Cell Lines
Published on: June 22, 2022
Function of Proton Channels in Lung Epithelia
1Children's Hospital Oakland Research Institute, 5700 Martin Luther King Jr Way, Oakland CA 94609-1673, USA, phone 510 450 7696, hfischer@chori.org.
Summary
The voltage-dependent H(+) channel (HVCN1) plays a key role in lung epithelial cells. It helps regulate lung mucosal pH by working with the CFTR HCO(3)(-) channel to maintain a neutral surface pH.
Area of Science:
- Physiology
- Cell Biology
- Respiratory Medicine
Background:
- The voltage-dependent H(+) channel (HVCN1) is present in lung epithelial cells.
- HVCN1 mRNA expression correlates with H(+) channel function in the lung.
- The channel's activation by depolarization, acidity, or alkalinity is unusual for lung epithelial cells.
Purpose of the Study:
- To investigate the conditions and physiological function of the H(+) channel in lung epithelium.
- To understand the role of HVCN1 in lung epithelial acid secretion.
- To elucidate the mechanism of mucosal pH regulation in the lung.
Main Methods:
- Study of voltage-dependent H(+) channel properties in lung epithelial cells.
- Analysis of HVCN1 mRNA expression.
- Investigation of channel activation under various pH and voltage conditions.
- Development of a model for mucosal pH regulation.
Main Results:
- HVCN1 activation occurs with alkaline extracellular pH.
- HVCN1 is involved in lung epithelial acid secretion.
- A model suggests parallel function of HVCN1 and CFTR HCO(3)(-) channels.
Conclusions:
- HVCN1 is critical for maintaining a neutral lung surface pH.
- The parallel function of HVCN1 and CFTR HCO(3)(-) channels regulates mucosal pH.
- Understanding HVCN1 function is key to lung physiology.
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