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Hitherto‐Unexplored Photodynamic Therapy of Ag 2 S and Enhanced Regulation Based on Polydopamine In Vitro and Vivo
Author(s) -
Cheng Kai,
Zhang XiaoShuai,
An Jie,
Li Cheng,
Zhang RuoYun,
Ye Run,
Ye BangJiao,
Liu Bo,
Zhao YuanDi
Publication year - 2019
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201900718
Subject(s) - photodynamic therapy , in vivo , photosensitizer , in vitro , wavelength , absorption (acoustics) , chemistry , quantum dot , irradiation , photochemistry , biophysics , materials science , nanotechnology , optoelectronics , physics , biochemistry , biology , microbiology and biotechnology , organic chemistry , nuclear physics , composite material
Given their superior penetration depths, photosensitizers with longer absorption wavelengths present broader application prospects in photodynamic therapy (PDT). Herein, Ag 2 S quantum dots were discovered, for the first time, to be capable of killing tumor cells through the photodynamic route by near‐infrared light irradiation, which means relatively less excitation of the probe compared with traditional photosensitizers absorbing short wavelengths. On modification with polydopamine (PDA), PDA‐Ag 2 S was obtained, which showed outstanding capacity for inducing reactive oxygen species (increased by 1.69 times). With the addition of PDA, Ag 2 S had more opportunities to react with surrounding O 2 , which was demonstrated by typical triplet electron spin resonance (ESR) analysis. Furthermore, the PDT effects of Ag 2 S and PDA‐Ag 2 S achieved at longer wavelengths were almost identical to the effects produced at 660 nm, which was proved by studies in vitro. PDA‐Ag 2 S showed distinctly better therapeutic effects than Ag 2 S in experiments in vivo, which further validated the enhanced regulatory effect of PDA. Altogether, a new photosensitizer with longer absorption wavelength was developed by using the hitherto‐unexplored photodynamic function of Ag 2 S quantum dots, which extended and enhanced the regulatory effect originating from PDA.