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Functional aza-boron dipyrromethenes for subcellular imaging and organelle-specific photodynamic therapy

Abstract

Two hydrophilic aza-boron dipyrromethene (aza-BODIPY) derivatives have first been designed and synthesised for subcellular imaging. With a triphenylphosphonium or morpholine substituent, these probes show high affinity towards the mitochondria or lysosomes of a range of cancer cell lines, including human cervical cancer HeLa cells, hepatocellular carcinoma HepG2 cells, breast cancer MCF-7 cells and colon adenocarcinoma HT29 cells as revealed by confocal microscopy. By introducing two bromo groups to the aza-BODIPY skeleton, which can promote the intersystem crossing by the heavy-atom effect, the resulting compounds become efficient singlet-oxygen generators and can serve as organelle-specific photosensitisers for photodynamic therapy (PDT). Upon irradiation, both compounds are photocytotoxic. The lysosome-targeted derivative exhibits higher cellular uptake and more efficient reactive oxygen species generation inside HeLa cells, resulting in higher PDT efficacy with an IC50 value of 0.48 μM and cell death mainly through apoptosis.

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Publication details

The article was received on 04 Mar 2018, accepted on 09 Apr 2018 and first published on 11 Apr 2018


Article type: Paper
DOI: 10.1039/C8TB00593A
Citation: J. Mater. Chem. B, 2018, Accepted Manuscript
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    Functional aza-boron dipyrromethenes for subcellular imaging and organelle-specific photodynamic therapy

    Q. Wang, D. K. P. Ng and P. Lo, J. Mater. Chem. B, 2018, Accepted Manuscript , DOI: 10.1039/C8TB00593A

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