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Voltage-gated proton channels in microglia.

C Eder¹, T E DeCoursey

¹Institut für Physiologie der Charité, Humboldt Universität, Tucholskystr. 2, D 10117 Berlin, Germany. claudia.eder@charite.de

Progress in Neurobiology

|March 10, 2001

Summary

Microglia possess voltage-gated proton channels (H+) crucial for brain function. These channels regulate membrane potential and pH during the respiratory burst, supporting microglial immune responses.

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Area of Science:

Neuroimmunology
Cellular Physiology
Ion Channel Biology

Background:

Microglia, the brain's resident macrophages, express various ion channels, including voltage-gated proton channels (H+).
The function of H+ currents in microglia is comparable to that observed in other phagocytic cells.
Proton currents are influenced by membrane potential, intracellular pH (pH(i)), and extracellular pH (pH(o)).

Purpose of the Study:

To characterize the properties of H+ currents in microglia.
To investigate the role of H+ channels in microglial function, particularly during the respiratory burst.

Main Methods:

Electrophysiological recordings to measure H+ currents in microglia.
Manipulation of intracellular and extracellular pH to study channel activation.
Application of cytoskeletal disruptive agents (cytochalasin D, colchicine) to assess their effects on H+ currents.
Analysis of H+ current modulation during microglial morphological changes.

Main Results:

H+ currents in microglia are activated by depolarization and depend on pH gradients, flowing outward under physiological conditions.
Inorganic polyvalent cations inhibit H+ currents, altering amplitude and voltage dependence.
Cytoskeletal disruption and morphological changes (ameboid to ramified) significantly modulate H+ current density and kinetics.

Conclusions:

Microglial H+ channels play a vital role in regulating membrane potential and intracellular pH during the respiratory burst.
These channels contribute to maintaining superoxide anion production by counteracting cellular acidification and supporting NADPH oxidase activity.
Modulation of H+ currents by cytoskeletal dynamics highlights their integration into microglial cellular processes.

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