Evidence
Nano Lett. 2024 Sep 24. doi: 10.1021/acs.nanolett.4c02425. Online ahead of print.
ABSTRACT
There is considerable evidence that action potentials are accompanied by “intrinsic optical signals”, such as a nanometer-scale motion of the cell membrane. Here we present ChiSCAT, a technically simple imaging scheme that detects such signals with interferometric sensitivity. ChiSCAT combines illumination by a chaotic speckle pattern and interferometric scattering microscopy (iSCAT) to sensitively detect motion in any direction. The technique features reflective high-NA illumination, common-path suppression of vibrations, and a large field of view. This approach maximizes sensitivity to motion, but does not produce a visually interpretable image. We show that unsupervised learning based on matched filtering and motif discovery can recover underlying motion patterns and detect action potentials. We demonstrate these claims in an experiment on blebbistatin-paralyzed cardiomyocytes. ChiSCAT opens the door to action potential measurement in scattering tissue, including a living brain.
PMID:39316755 | DOI:10.1021/acs.nanolett.4c02425
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