Identifying dynamic membrane structures with atomic-force microscopy and confocal imaging.

Area of Science:

• Cell Biology
• Microscopy Techniques
• Nanotechnology

Background:

• Combining fluorescence microscopy and atomic force microscopy (AFM) offers unique insights into cell biology.
• AFM drift causes image misalignment, limiting the combined application of these techniques.
• Accurate alignment is crucial for correlating nanoscale topographic features with biological functions.

Purpose of the Study:

• To develop a robust method for aligning fluorescence and AFM images.
• To overcome the limitations of AFM drift in correlative microscopy.
• To enable precise mapping of nanoscale cellular structures and processes.

Main Methods:

• Utilized the atomic force microscope's cantilever tip as a reference landmark for alignment.
• Developed an alignment correction algorithm based on known tip positions in both imaging modalities.
• Validated the method using artificial samples (beads) and biological samples (human fibroblasts).

Main Results:

• Successfully demonstrated accurate image alignment using the cantilever tip as a reference.
• Showcased the method's effectiveness on both artificial and biological samples.
• Precisely mapped nanoscale membrane structures, like clathrin-coated pits, to corresponding fluorescence signals in fixed and living cells.

Conclusions:

• The developed alignment method effectively corrects AFM drift, enabling reliable correlative imaging.
• This technique opens new avenues for studying cell surface dynamics, including endocytosis and exocytosis, at the nanoscale.
• Facilitates a deeper understanding of fundamental cell biology through integrated high-resolution imaging.