An acid-cleavable phthalocyanine tetramer as an activatable photosensitiser for photodynamic therapy

2016 ◽  
Vol 45 (33) ◽  
pp. 13021-13024 ◽  
Author(s):  
Sun Y. S. Chow ◽  
Pui-Chi Lo ◽  
Dennis K. P. Ng
Keyword(s):  
Photodynamic Therapy ◽  
Singlet Oxygen ◽  
Fluorescence Emission ◽  
Oxygen Production ◽  
Enhanced Fluorescence ◽  
Acidic Environments

A novel self-quenched phthalocyanine tetramer has been prepared which can be activated in acidic environments, resulting in enhanced fluorescence emission and singlet oxygen production.

PEGylated AIEgen Molecular Probe for Hypoxia-Mediated Tumor Imaging and Photodynamic Therapy

2021 ◽  
Author(s):  
Jun Li ◽  
Wei Liu ◽  
Zhuhao Li ◽  
Yingcai Hu ◽  
Jinfeng Yang ◽  
...  
Keyword(s):  
Photodynamic Therapy ◽  
Singlet Oxygen ◽  
Tumor Imaging ◽  
Fluorescence Emission ◽  
Molecular Probe ◽  
Enhanced Fluorescence ◽  
High Concentrations

Unlike the aggregation caused quenching (ACQ) and reduced singlet oxygen (1O2) production of traditional photosensitizers at high concentrations, AIEgen photosensitizers show enhanced fluorescence emission and photosensitization ability in the aggregated...

scholarly journals Gold Nanostars-AIE Theranostic Nanodots with Enhanced Fluorescence and Photosensitization Towards Effective Image-Guided Photodynamic Therapy

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Mohammad Tavakkoli Yaraki ◽  
Min Wu ◽  
Eshu Middha ◽  
Wenbo Wu ◽  
Soroosh Daqiqeh Rezaei ◽  
...  
Keyword(s):  
Photodynamic Therapy ◽  
Singlet Oxygen ◽  
Enhancement Factor ◽  
Fluorescence Emission ◽  
Localized Surface Plasmon ◽  
Enhanced Fluorescence ◽  
Oxygen Generation ◽  
Image Guided ◽  
Singlet Oxygen Generation

AbstractDual-functional aggregation-induced photosensitizers (AIE-PSs) with singlet oxygen generation (SOG) ability and bright fluorescence in aggregated state have received much attention in image-guided photodynamic therapy (PDT). However, designing an AIE-PS with both high SOG and intense fluorescence via molecular design is still challenging. In this work, we report a new nanohybrid consisting of gold nanostar (AuNS) and AIE-PS dots with enhanced fluorescence and photosensitization for theranostic applications. The spectral overlap between the extinction of AuNS and fluorescence emission of AIE-PS dots (665 nm) is carefully selected using five different AuNSs with distinct localized surface plasmon (LSPR) peaks. Results show that all the AuNSs can enhance the 1O2 production of AIE-PS dots, among which the AuNS with LSPR peak at 585 nm exhibited the highest 1O2 enhancement factor of 15-fold with increased fluorescence brightness. To the best of our knowledge, this is the highest enhancement factor reported for the metal-enhanced singlet oxygen generation systems. The Au585@AIE-PS nanodots were applied for simultaneous fluorescence imaging and photodynamic ablation of HeLa cancer cells with strongly enhanced PDT efficiency in vitro. This study provides a better understanding of the metal-enhanced AIE-PS nanohybrid systems, opening up new avenue towards advanced image-guided PDT with greatly improved efficacy.

The Measurement of Singlet Oxygen Production in an Experimental Tongue Cancer Model as an Indicator for Photodynamic Therapy

2013 ◽  
Vol 136 (0) ◽  
pp. 62-69
Author(s):  
Ying-Ying Wu ◽  
Toru Hirano ◽  
Junko Yamamoto ◽  
Guang-Wu Huang ◽  
Seiji Yamamoto ◽  
...  
Keyword(s):  
Photodynamic Therapy ◽  
Singlet Oxygen ◽  
Tongue Cancer ◽  
Oxygen Production ◽  
Cancer Model

scholarly journals Tritolylporphyrin dimer as a new potent hydrophobic sensitizer for photodynamic therapy of melanoma.

2001 ◽  
Vol 48 (1) ◽  
pp. 277-282 ◽  
Author(s):  
A Drzewiecka ◽  
K Urbańska ◽  
Z Matuszak ◽  
M Pineiro ◽  
L G Arnaut ◽  
...  
Keyword(s):  
Photodynamic Therapy ◽  
Quantum Yield ◽  
Singlet Oxygen ◽  
Biological Effect ◽  
Photophysical Properties ◽  
Red Light ◽  
Human Melanoma ◽  
Oxygen Production ◽  
Absorption And Emission ◽  
Emission Properties

We report the synthesis, photochemical and photophysical properties and preliminary studies on biological effect of a new tritolylporphyrin dimer (T-D). Absorption and emission properties of T-D suggest its possible use in photodynamic therapy. T-D is capable of singlet oxygen production with 0.8 quantum yield. It also has a high photostability. The photodynamic properties of the dimer were examined following the growth of SKMEL 188 (human melanoma) cells irradiated with red light (cut off < 630 nm). The surviving fraction of the cells decreased about 3-fold (vs. non-irradiated cells) for an 81 J/cm dose. Our results suggest that tritolylporphyrine dimer T-D may be an interesting hydrophobic sensitizer for photodynamic therapy.

Cubic POSS engineering of photosensitizer-doped semiconducting polymer nanoparticles for enhanced fluorescence imaging and amplified photodynamic therapy

2020 ◽  
Vol 11 (44) ◽  
pp. 7035-7041
Author(s):  
Biqing Bao ◽  
Xue Zhai ◽  
Tianqi Liu ◽  
Peng Su ◽  
Luyao Zhou ◽  
...  
Keyword(s):  
Photodynamic Therapy ◽  
Singlet Oxygen ◽  
Fluorescence Imaging ◽  
Polymer Nanoparticles ◽  
Enhanced Fluorescence ◽  
Semiconducting Polymer ◽  
Oxygen Generation ◽  
Singlet Oxygen Generation ◽  
Semiconducting Polymer Nanoparticles

PorPOSSC12 -doped semiconducting polymer nanoparticles with simultaneously enhanced fluorescence brightness and amplified singlet oxygen generation ability were designed for imaging-guided photodynamic therapy.

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