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Tracking Neutrophil Intraluminal Crawling, Transendothelial Migration and Chemotaxis in Tissue by Intravital Video Microscopy
Published on: September 24, 2011
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Inwardly rectifying potassium channels promote directional sensing during neutrophil chemotaxis
Tianqi Wang1, Daniel H Kim1, Chang Ding1
1Department of Biological Sciences, Purdue University, West Lafayette, West Lafayette, IN, USA.
The Journal of Cell Biology
|November 19, 2025
Summary
Inwardly rectifying potassium channels, like Kir7.1, are vital for immune cell navigation. These channels help neutrophils sense direction and migrate effectively toward chemical signals.
Area of Science:
- Immunology
- Cell Biology
- Neuroscience
Background:
- Potassium channels regulate membrane potential and cell migration.
- The role of inwardly rectifying potassium channels (Kir) in immune cell chemotaxis is not well understood.
Purpose of the Study:
- To investigate the function of Kir channels, specifically Kir7.1, in neutrophil chemotaxis and directional sensing.
- To elucidate the role of membrane potential in immune cell migration.
Main Methods:
- Utilized neutrophil-specific Kir knockout models in zebrafish and dHL-60 cells.
- Employed genetically encoded voltage indicators and optogenetics for real-time membrane potential monitoring and manipulation.
- Assessed neutrophil migration and directional sensing in response to various chemoattractants.
Main Results:
- Kir7.1 is essential for maintaining neutrophil resting membrane potential and directional sensing during chemotaxis.
- Blocking or deleting Kir channels impaired neutrophils' ability to orient toward chemoattractants.
- Observed oscillating hyperpolarization during tail retraction, with Kir7.1 necessary for depolarization towards chemokine sources.
- Optogenetic focal depolarization influenced pseudopod selection and protrusion formation, dependent on Gα signaling.
- Global hyperpolarization led to stalled neutrophil migration and affected GPCR signaling.
Conclusions:
- Membrane potential, regulated by Kir channels, is a critical factor in neutrophil chemotaxis.
- Kir channels are integral to the feedforward mechanisms guiding immune cells in complex environments.
- This study highlights the link between excitable cell properties and adaptive immune responses.
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