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Affordable Oxygen Microscopy-Assisted Biofabrication of Multicellular Spheroids

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A BODIPY-based 'turn-on' fluorescent probe for hypoxic cell imaging.

Sisi Wang¹, Hui Liu, John Mack

¹Key Laboratory of Organosilicon Chemistry and Material Technology, Ministry of Education, Hangzhou Normal University, Hangzhou, 311121, P. R. China. hualu@hznu.edu.cn.

Chemical Communications (Cambridge, England)

|July 25, 2015

Summary

A novel boron-dipyrromethene (BODIPY) dye shows

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Area of Science:

Organic chemistry
Photochemistry
Biomedical imaging

Background:

Boron-dipyrromethene (BODIPY) dyes are widely used in fluorescence imaging.
Hypoxia, a low-oxygen state, is a hallmark of many diseases, including cancer.
Developing specific probes for hypoxic cells is crucial for diagnosis and treatment.

Purpose of the Study:

To design and synthesize a novel BODIPY dye for selective detection of hypoxic cells.
To investigate the photophysical properties and fluorescence response mechanism of the designed dye.

Main Methods:

Synthesis of a BODIPY dye (1a) featuring a styryl substituent with hydroxyl and nitro groups.
Spectroscopic analysis (absorption, emission) to study photophysical properties.
Cellular experiments to evaluate the dye's 'turn-on' fluorescence in hypoxic conditions.

Main Results:

The synthesized BODIPY dye (1a) demonstrated a 'turn-on' fluorescence response specifically in hypoxic cells.
The electron-withdrawing nitro group facilitated efficient nonradiative decay, leading to low fluorescence in normoxic conditions.
Nitro reduction under hypoxia restored fluorescence, enabling selective imaging of hypoxic environments.

Conclusions:

The novel BODIPY dye (1a) is a promising fluorescent probe for identifying hypoxic cells.
The 'turn-on' mechanism based on nitro reduction provides high sensitivity and selectivity for hypoxia imaging.
This dye has potential applications in biomedical research and clinical diagnostics for diseases associated with hypoxia.