Synthesis of Water-Soluble Far-Red-Emitting Amphiphilic BODIPY Dyes

Area of Science:

• Organic Chemistry
• Biophysical Chemistry
• Cell Biology

Background:

• BODIPY dyes are widely used fluorescent probes.
• Developing water-soluble variants with specific cellular localization is challenging.
• Far-red/near-infrared probes are desirable for reduced autofluorescence and deeper tissue penetration.

Purpose of the Study:

• To synthesize novel water-soluble BODIPY dyes.
• To achieve specific labeling of the cell plasma membrane.
• To investigate their photophysical properties and stability.

Main Methods:

• Synthesis of dicationic and dianionic BODIPY derivatives.
• Spectroscopic characterization (absorption, emission).
• Cellular imaging studies to assess localization and photostability.

Main Results:

• Two water-soluble BODIPY dyes with far-red absorption and NIR fluorescence were synthesized.
• Dicationic and dianionic groups ensured water solubility and plasma membrane localization.
• The dicationic dye showed excellent plasma membrane localization and resistance to photobleaching (>8 min).
• Dyes were nonemissive in polar solvents but highly fluorescent in nonpolar solvents and upon membrane insertion.

Conclusions:

• Novel water-soluble BODIPY dyes enable effective and photostable plasma membrane labeling.
• The dicationic derivative is a promising probe for live-cell imaging of the plasma membrane.
• These dyes offer advantages for biological imaging due to their spectral properties and localization.