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Summary
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Live-cell super-resolution optical fluctuation imaging (SOFI) was combined with fixed-cell techniques to validate imaging of cellular structures. This correlative microscopy approach confirmed minimal artifacts during sample preparation, enhancing live-cell imaging reliability.

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Area of Science:

  • Cellular and Molecular Imaging
  • Biophysics
  • Super-resolution Microscopy

Background:

  • Standard optical microscopy is limited by diffraction, hindering visualization of subcellular components.
  • Super-resolution techniques offer higher resolution but typically require fixed samples, raising questions about image fidelity.
  • Correlative microscopy combines multiple techniques to overcome individual limitations.

Purpose of the Study:

  • To integrate live-cell Super-Resolution Optical Fluctuation Imaging (SOFI) into a correlative workflow with Single Molecule Localization Microscopy (SMLM) and Atomic Force Microscopy (AFM).
  • To assess the impact of sample preparation on cellular ultrastructure by comparing live-cell SOFI with fixed-cell SMLM and AFM.
  • To evaluate fluorescent protein combinations for dual-target live-cell SOFI.

Main Methods:

  • Live-cell SOFI was performed on COS-7 cells using low laser power and fluorescent proteins.
  • Correlative imaging was conducted using SOFI, SMLM, and AFM to analyze microtubules and actin.
  • Various fluorescent protein pairs were tested for two-target SOFI capability.

Main Results:

  • Live-cell SOFI of microtubules showed minimal changes in the microtubule network within 20 minutes of fixation.
  • SOFI, SMLM, and AFM provided complementary measurements of microtubule dimensions and protrusion.
  • Specific fluorescent protein combinations (rsGreen1-rsKAME, rsGreen1-Dronpa, ffDronpaF-rsKAME) were validated for two-target SOFI.

Conclusions:

  • Correlative SOFI-SMLM-AFM demonstrates the feasibility of live-cell super-resolution imaging with minimal sample preparation artifacts.
  • This integrated approach validates the accuracy of fixed-cell super-resolution data by comparison with live-cell imaging.
  • The study highlights the power of correlative microscopy for reliable ultrastructural analysis in live and fixed cells.