Abstract
Elsinochrome A (EA) possesses the highest singlet-oxygen quantum yield (0.98) amongst the perilenoquinoid pigments and may be suitable as a phototherapeutic drug. However, there have been virtually no studies into its medicinal applications. Based on the analysis of chemical derivatives of hypocrellins (the same family as EA), 5-(3-mercapto-1-propanesulfonic acid)-substituted elsinochrome A (MPEA) with an amphiphilicity was designed and synthesized by considering drug delivery and biological activity requirements. MPEA possesses a water solubility of 5.1 mg mL-1, which is just sufficient to enable dissolution at a clinically acceptable concentration, while its partition coefficient (n-octanol/phosphate buffered saline) of 7 guarantees affinity to biological targets. MPEA could photogenerate semiquinone anion radicals and reactive oxygen species, especially singlet oxygen, at a yield of 0.73, which approaches that for hypocrellin B. Biological tests confirmed that the photodynamic activity of MPEA was as high as 60% of that of its parent EA, which is significantly higher than that of most other photosensitizers.
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Abbreviations
- DMPO:
-
5,5-Dimethyl-1-pyrroline-N-oxide
- SOD:
-
Superoxide dismutase
- NADH:
-
Reduced nicotinamideadenine dinucleotide
- DMSO:
-
Dimethyl sulfoxide
- PBS:
-
Phosphate buffered saline
- TEMPO:
-
2,2,6,6-Tetramethyl-4-piperidone-N-oxyl radical
- TEMP:
-
2,6,6-Tetramethyl-4-piperidone
- EPR:
-
Electron paramagnetic resonance
- DPA:
-
9,10-Diphenylanthracene
- DABCO:
-
1,4-Diazabicyclo[2,2,2]octane
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Zhang, Y., Xie, J., Zhang, L. et al. A novel elsinochrome A derivative: a study of drug delivery and photodynamic activity. Photochem Photobiol Sci 8, 1676–1682 (2009). https://doi.org/10.1039/b9pp00046a
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DOI: https://doi.org/10.1039/b9pp00046a