Optical trap and laser interferometry in living cells

Daisuke Mizuno, Umeda Katsuhiro, Sugino Yujiro, Kenji Nishizawa

Research output: Contribution to journalConference articlepeer-review

Abstract

Mechanics of living cell interior are governed by cytoskeletons and cytosol. They are extraordinarily heterogeneous and their physical properties are strongly affected by the internally generated forces. In order to understand the out-ofequilibrium mechanics, we have developed a method of microrheology using laser interferometry and optical trapping technology. This method allowed us to probe mechanics and dynamics in living cells with a high spatio-temporal resolution. Microscopic probes in cells are stably trapped in the presence of vigorous cytoplasmic fluctuations, by employing smooth 3D feedback of a piezo-actuated sample stage. To interpret the data, we present a theory that adapts the fluctuation-dissipation theorem (FDT) to out-of-equilibrium systems. We discuss the interplay between material properties and non-thermal force fluctuations in the living cells that we quantify through the violations of the FDT.

Original languageEnglish
Article number1114001-16
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume11140
Publication statusPublished - Jan 1 2019
EventBiomedical Imaging and Sensing Conference 2019, BISC 2019 - Yokohama, Japan
Duration: Apr 22 2019Apr 26 2019

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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