Lipid droplets as endogenous intracellular microlenses

Area of Science:

• Biophotonics
• Cellular Imaging
• Optical Engineering

Background:

• Biophotonics explores using biological elements as photonic components.
• Endogenous structures within cells offer potential for novel optical applications.

Purpose of the Study:

• To investigate the potential of endogenous lipid droplets in adipose cells as biocompatible microlenses.
• To enhance microscopic imaging and signal detection capabilities within cells.
• To explore applications in biosensing and diagnostics.

Main Methods:

• Utilizing mature adipose cells containing endogenous lipid droplets.
• Employing optical tweezers for manipulation and real-time imaging of lipid droplets.
• Performing enhanced fluorescence imaging of cellular components and viruses.
• Measuring excitation power reduction and fluorescence signal detection efficiency.

Main Results:

• Endogenous lipid droplets function as effective biocompatible microlenses.
• Enhanced fluorescence imaging of cytoskeleton, lysosomes, and adenoviruses was achieved.
• Excitation power requirements were reduced by up to 73%.
• Optical tweezers enabled precise manipulation and real-time intracellular imaging.
• Efficient detection of extracellular cancer cell fluorescence was demonstrated.

Conclusions:

• Lipid droplets serve as natural intracellular microlenses, improving microscopic imaging and signal detection.
• This biocompatible optics tool offers potential for advanced biosensing, endoscopic imaging, and single-cell diagnosis.
• The findings open new avenues for multifunctional optical applications in biology and medicine.