Cell and tissue autofluorescence research and diagnostic applications

Area of Science:

• Cellular and Molecular Biology
• Biophysics
• Biophotonics

Background:

• Cell auto-fluorescence arises from intrinsic molecules (endogenous fluorophores) within cells and tissues.
• Key endogenous fluorophores include pyridinic (NADPH) and flavin coenzymes, aromatic amino acids, lipo-pigments, collagen, and elastin.
• Mitochondria, lysosomes, and the extracellular matrix are major contributors to cellular and tissue auto-fluorescence.

Purpose of the Study:

• To highlight the significance of endogenous fluorophores in cellular auto-fluorescence.
• To explain how changes in cell/tissue state alter auto-fluorescence properties.
• To underscore the utility of auto-fluorescence monitoring in research and diagnostics.

Main Methods:

• Utilizing UV/Vis radiation to excite endogenous fluorophores within cells and tissues.
• Employing spectroscopic and imaging techniques to analyze auto-fluorescence signals.
• Real-time monitoring without the need for specimen fixation or staining.

Main Results:

• Auto-fluorescence emission is an intrinsic cellular property, distinct from exogenous markers.
• The extracellular matrix can significantly contribute to tissue auto-fluorescence due to high quantum yield fluorophores like collagen.
• Modifications in endogenous fluorophore levels and microenvironment properties reflect physiological and pathological changes.

Conclusions:

• Auto-fluorescence analysis offers a label-free, real-time method for assessing cellular and tissue states.
• Spectroscopic and imaging techniques based on auto-fluorescence have diverse applications in basic research and clinical diagnostics.
• This intrinsic cellular property provides valuable morphological and physiological information.