Probing PIEZO1 Localization upon Activation Using High-Resolution Atomic Force and Confocal Microscopy.

Area of Science:

• Biophysics
• Cell Biology
• Mechanobiology

Background:

• PIEZO1 ion channels are mechanosensitive, responding to physical forces.
• Membrane tension and curvature are known to affect PIEZO1 gating.
• The nanoscale localization and organization of PIEZO1 remain poorly understood.

Purpose of the Study:

• To investigate the nanoscale localization of PIEZO1 in red blood cells.
• To determine how mechanical factors like membrane tension and curvature influence PIEZO1 distribution.
• To explore the interaction of PIEZO1 with the red blood cell cytoskeleton.

Main Methods:

• High-resolution imaging to probe PIEZO1 localization at the nanoscale (~30 nm).
• Utilized Yoda1, an allosteric PIEZO1 modulator.
• Investigated PIEZO1 interactions with the spectrin cytoskeleton.

Main Results:

• Discovered submicrometric PIEZO1 clusters in native red blood cells.
• Observed increased PIEZO1 clustering in areas of high membrane tension and low curvature upon Yoda1 treatment.
• Demonstrated PIEZO1 interaction with the spectrin cytoskeleton in both resting and activated states.

Conclusions:

• PIEZO1 ion channels form distinct clusters on the red blood cell membrane.
• Membrane tension gradients and curvature gradients play a crucial role in regulating PIEZO1 localization.
• PIEZO1's association with the spectrin cytoskeleton is a key factor in its mechanical response.