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Photoactivated cell-killing amino-based flavylium compounds

Title
Photoactivated cell-killing amino-based flavylium compounds
Type
Article in International Scientific Journal
Year
2021
Authors
Araujo, P
(Author)
Other
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Victor de Freitas
(Author)
FCUP
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de Freitas, V
(Author)
Other
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Joana Oliveira
(Author)
FCUP
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Journal
Title: Scientific ReportsImported from Authenticus Search for Journal Publications
Vol. 11
ISSN: 2045-2322
Publisher: Springer Nature
Other information
Authenticus ID: P-00V-NX3
Abstract (EN): Photodynamic therapy (PDT) is a well-established therapeutic for the treatment of different diseases. The growing interest of this technique required the development of new photosensitizers with better photo-features. This work reports the study of the potential of five nature-inspired amino-based flavylium compounds with different structural features as photosensitizers towards topical PDT. In terms of dark cytotoxicity the five pigments were tested towards confluent skin cells in both fibroblasts and keratinocytes. In the range of concentrations tested (6.3-100 mu M), keratinocytes were more prone to growth inhibition and the IC50 values for 5OH4 ' NMe2, 7NEt(2)st4 ' NMe2 and 7NEt(2)4 ' NH2 were determined to be 47.3 +/- 0.3 mu M; 91.0 +/- 0.8 mu M and 29.8 +/- 0.8 mu M, respectively. 7NEt(2)4 ' NMe2, 7NEt(2)st4 ' NMe2 and 7NEt(2)4 ' NH2 showed significant fluorescence quantum yields (from 3.40 to 20.20%) and production of singlet oxygen (O-1(2)). These latter chromophores presented IC50 values of growth inhibition of keratinocytes between 0.9 and 1.5 mu M, after 10 min of photoactivation with white light. This cellular damage in keratinocyte cells upon white light activation was accompanied with the production of reactive oxygen species (ROS). It was also found that the compounds can induce damage by either type I (ROS production) or type II (singlet oxygen) PDT mechanism, although a higher cell survival was observed in the presence of O-1(2) quenchers. Overall, a structure-activity relationship could be established, ranking the most important functional groups for the photoactivation efficiency as follows: C7-diethylamino > C4 '-dimethylamino > C2-styryl.
Language: English
Type (Professor's evaluation): Scientific
No. of pages: 16
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