Probing cytoskeletal structures by coupling optical superresolution and AFM techniques for a correlative approach

Area of Science:

• Biophysics
• Cell Biology
• Microscopy

Background:

• Cytoskeletal structures, such as microtubule filaments, are crucial for cell structure and mechanical support.
• Understanding the mechanical and structural properties of cytoskeletal elements is vital for cell biology research.

Purpose of the Study:

• To describe and demonstrate the application of advanced fluorescence super-resolution techniques, STED AFM and STORM AFM microscopy.
• To integrate mechanical property measurements with super-resolution structural imaging of cytoskeletal components.

Main Methods:

• Utilizing Stimulated Emission Depletion (STED) and Stochastic Optical Reconstruction Microscopy (STORM) coupled with Atomic Force Microscopy (AFM).
• Employing AFM force spectroscopy to measure local stiffness and elasticity of cytoskeletal structures with nanometer resolution.
• Analyzing force curves to calculate local elasticity and Young's modulus.

Main Results:

• Achieved super-resolution structural information of cytoskeletal filaments.
• Successfully combined mechanical property measurements (elasticity, Young's modulus) with high-resolution imaging.
• Demonstrated the power of correlative multimodal microscopy for detailed cellular structure analysis.

Conclusions:

• The hybrid super-resolution AFM modality offers a powerful approach for investigating the mechanical and structural properties of cytoskeletal elements.
• This integrated technique provides high specificity and detailed structural insights, advancing cell biology research.