BODIPY based red emitters: Synthesis, computational and biological studies.

Area of Science:

• Organic Chemistry
• Materials Science
• Biomedical Engineering

Background:

• Boron-dipyrromethene (BODIPY) dyes are versatile fluorophores.
• Developing red-emitting BODIPYs is crucial for biological imaging and therapy due to reduced autofluorescence and enhanced tissue penetration.

Purpose of the Study:

• To synthesize and characterize novel donor-acceptor type BODIPY dyes with strong absorption and fluorescence in the red region (550-800 nm).
• To investigate the photophysical properties, cellular localization, and cytotoxic effects of these BODIPY derivatives for potential theranostic applications.

Main Methods:

• Synthesis of BODIPY derivatives with N-butylcarbazole, N-butylphenothiazine, or benzothiadiazole groups attached at the C-8 position via furan or thiophene spacers.
• Theoretical studies using Time-Dependent Density Functional Theory (TD-DFT) to analyze charge distribution.
• In vitro studies involving incubation with cancer cells (HeLa and A549) to assess cellular localization (endoplasmic reticulum, lysosomes) and cytotoxicity.

Main Results:

• Synthesized BODIPY dyes exhibit strong absorption and fluorescence in the red spectral region.
• TD-DFT studies confirmed significant charge transfer between the C-8 aromatic heterocycles and the BODIPY core.
• N-butylcarbazole substituted BODIPYs showed preferential localization in the endoplasmic reticulum and lysosomes of cancer cells.
• The BODIPY derivatives displayed moderate cytotoxicity against HeLa and A549 cancer cells (14.9 to 31.8 μM) after 48 hours of incubation.

Conclusions:

• Novel red-emitting BODIPY dyes have been successfully synthesized and characterized.
• These BODIPY derivatives possess favorable photophysical properties and demonstrate specific cellular uptake and cytotoxic activity.
• The findings suggest potential applications of these BODIPY compounds as theranostic agents for cancer treatment and imaging.