Light-up lipid droplets dynamic behaviors using rationally designed carbon dots.

Area of Science:

• Cell Biology
• Biochemistry
• Chemical Biology

Background:

• Lipid droplets (LDs) are crucial for cellular lipid storage and metabolism.
• Imaging LDs is vital for understanding their biological roles.
• Existing imaging techniques may lack specificity or dynamic tracking capabilities.

Purpose of the Study:

• To design and synthesize novel fluorescent probes (LD-CDs) for specific and sensitive imaging of lipid droplets.
• To investigate the probes' ability to monitor LD dynamics and cellular processes like lipophagy.
• To explore the application of LD-CDs in distinguishing cancer cells and visualizing lipid metabolism in vivo.

Main Methods:

• Schiff base reaction using specific precursors to synthesize LD-targeted carbon dots (LD-CDs).
• Characterization of LD-CDs' solvatochromic properties and sensitivity to polarity changes.
• In vitro and in vivo imaging experiments in cell lines and zebrafish models.
• Monitoring dynamic cellular events including LD dissociation, migration, fusion, and lipophagy.

Main Results:

• The designed LD-CDs exhibit robust solvatochromic emission and high sensitivity to polarity changes.
• LD-CDs demonstrate excellent lipophilicity and specificity for targeting LDs in living cells.
• The probes successfully differentiated cancer cells from normal cells and tracked LD dynamics in real-time.
• Dynamic changes during lipophagy and lipid metabolism in zebrafish were visualized.
• Polarity changes in LDs under stimulation were revealed.

Conclusions:

• Novel LD-targeted carbon dots (LD-CDs) with desirable properties for biological imaging have been developed.
• LD-CDs offer a powerful tool for real-time monitoring of LD dynamics, cellular lipid metabolism, and disease states.
• This work expands the utility of carbon dots in advanced biological imaging and disease research.