Colocalization of cellular nanostructure using confocal fluorescence and partial wave spectroscopy

Area of Science:

• Biophysics
• Cell Biology
• Optical Microscopy

Background:

• Understanding nanoscale intracellular structure is crucial for disease mechanisms, including cancer.
• Current imaging techniques may lack the combined molecular specificity and nanoscale sensitivity required.
• Developing advanced microscopy is essential for detailed cellular analysis.

Purpose of the Study:

• To introduce a new multimodal confocal microscope integrating Partial Wave Spectroscopic (PWS) microscopy.
• To enable molecular-specific sensing of nanoscale intracellular structure.
• To demonstrate the instrument's capability in identifying disease-related cellular changes.

Main Methods:

• Development of a multimodal confocal microscope with a parallel PWS microscopy path.
• Imaging of HeLa cells treated with valinomycin, a potassium ionophore.
• Colocalization of fluorescence imaging (nuclei and mitochondria) with PWS measurements.
• Application of the multimodal approach to human buccal samples for cancer screening.

Main Results:

• Detected a significant decrease in nuclear nanoscale heterogeneity (Σ) in valinomycin-treated HeLa cells.
• Observed no significant change in mitochondrial nanoscale heterogeneity (Σ).
• Successfully demonstrated the imaging of nanoscale intracellular structure in healthy and diseased human buccal cells.

Conclusions:

• The multimodal microscope effectively combines molecular specificity and nanoscale sensitivity.
• This technology can localize nanostructural intracellular changes relevant to disease mechanisms.
• The developed instrument shows promise for studying cellular structures in both healthy and diseased states, including cancer diagnostics.