Imaging cellular structures in super-resolution with SIM, STED and Localisation Microscopy: A practical comparison

Area of Science:

• Cell Biology
• Microscopy
• Biophysics

Background:

• Biological imaging often requires resolution beyond the diffraction limit of light.
• Super-resolution microscopy techniques offer enhanced resolution for detailed subcellular visualization.

Purpose of the Study:

• To compare the strengths and weaknesses of Structured Illumination Microscopy (SIM), STimulated Emission Depletion (STED) microscopy, and Single Molecule Localisation Microscopy (SMLM).
• To provide guidelines for selecting appropriate super-resolution techniques for specific biological applications.
• To identify potential pitfalls associated with each super-resolution method.

Main Methods:

• Imaging of diverse subcellular structures in fixed cells using SIM, STED, and SMLM.
• Quantitative and correlative analyses were employed to assess technique performance.
• Comparison focused on resolution, suitability for different structures (vesicles, filaments), and practical considerations.

Main Results:

• Each super-resolution technique demonstrated unique advantages and limitations depending on the sample's complexity and structure.
• SIM provided good resolution for various structures but with limitations in dense environments.
• STED offered high resolution for specific targets, while SMLM excelled in resolving densely packed structures but required specific sample preparation.

Conclusions:

• The choice of super-resolution technique (SIM, STED, SMLM) depends critically on the biological question and sample characteristics.
• Understanding the specific performance and limitations of each method is crucial for successful super-resolution imaging.
• This comparative analysis serves as a guideline for researchers applying super-resolution microscopy to subcellular structures.