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Enhance photodynamic therapy

Zhijia Wang, Yuting Gao, Mushraf Hussain, Sushma Kundu, Vinayak Rane, Mustafa Hayvali, Elif Akhuseyin Yildiz, Jianzhang Zhao, Halime Gul Yaglioglu, Ranjan Das, Liang Luo, Jianfeng Li
Compact naphthalenediimide (NDI)-2,2,6,6-tetramethyl piperidine N-oxyl (TEMPO) dyad was prepared, with the aim to study the radical-enhanced intersystem crossing (EISC) and the formation of high spin states, as well as the electron spin polarization (ESP) dynamics. Compared to the previously reported radical-chromophore dyads, the present system shows a very high triplet state quantum yield (74%), long-lived triplet state (8.7 microseconds), fast EISC (338 ps) and absorption in the red spectral region. Time-resolved electron paramagnetic resonance (TRERP) spectroscopy shows that, on photoexcitation in fluid solution at room temperature, the D0 state of TEMPO moiety produces strong emissive (E) polarization, owing to the quenching of the excited singlet state of NDI by the radical moiety (electron exchange J > 0)...
October 16, 2018: Chemistry: a European Journal
Cherie Ann Kruger, Heidi Abrahamse
The cancer incidence world-wide has caused an increase in the demand for effective forms of treatment. One unconventional form of treatment for cancer is photodynamic therapy (PDT). PDT has 3 fundamental factors, namely a photosensitiser (PS) drug, light and oxygen. When a PS drug is administered to a patient, it can either passively or actively accumulate within a tumour site and once exposed to a specific wavelength of light, it is excited to produce reactive oxygen species (ROS), resulting in tumour destruction...
October 13, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Jihwan Son, Gawon Yi, Jihye Yoo, Changhee Park, Heebeom Koo, Hak Soo Choi
Nanoparticles (NPs) play a key role in nanomedicine in multimodal imaging, drug delivery and targeted therapy of human diseases. Consequently, due to the attractive properties of NPs including high stability, high payload, multifunctionality, design flexibility, and efficient delivery to target tissues, nanomedicine employs various types of NPs to enhance targeting and treatment efficacy. In this review, we primarily focus on light-responsive materials, such as fluorophores, photosensitizers, semiconducting polymers, carbon structures, gold particles, quantum dots, and upconversion crystals, for their biomedical applications...
October 12, 2018: Advanced Drug Delivery Reviews
Yuan Liu, Weijia Hou, Lian Xia, Cheng Cui, Shuo Wan, Ying Jiang, Yu Yang, Qiong Wu, Liping Qiu, Weihong Tan
Porphyrinic metal-organic framework (MOF) nanoparticles for photodynamic therapy solve the photosensitizer problems of poor solubility, self-quenching and aggregation. However, their low selectivity towards malignant tissues is an obstacle for bioimaging and a bottle-neck to cellular uptake for highly efficient photodynamic therapy of cancer. Here, ZrMOF nanoparticles as quenchers to conjugate DNA aptamers were developed for target-induced bioimaging and photodynamic therapy. A phosphate-terminal aptamer prepared by solid-phase DNA synthesis was anchored on the surface of ZrMOF nanoparticles through strong coordination between phosphate and zirconium...
October 14, 2018: Chemical Science
Maozhong Sun, Aihua Qu, Changlong Hao, Xiaoling Wu, Liguang Xu, Chuanlai Xu, Hua Kuang
Heterodimers of upconversion nanoparticles (UCNPs) and gold yolk-shell nanoparticles are fabricated for the quantification of polymyxin-B-resistant Escherichia coli. They produce two signals, circular dichroism (CD) and upconversion luminescence (UCL). Interestingly, due to the different affinity of polymyxin B for sensitive and resistant strain, as the concentration of polymyxin B increases, the amount of UCNPs in sensitive bacteria increases sharply, increasing the intracellular UCL signal at a low polymyxin B concentration immobilized on the UCNP...
October 15, 2018: Advanced Materials
Weian Zhang, Jianqiu Jin, Yucheng Zhu, Zhenghe Zhang
Aggregation-induced quenching (AIQ) of photosensitizers greatly reduces the quantum yield of singlet oxygen generation and mitigates the efficacy of photodynamic therapy (PDT). We have prepared an alternating copolymer starting from 4-vinylbenzyl-terminated tetraphenylporphyrin (VBTPP) and maleimide isobutyl polyhedral oligomeric silsesquioxane (MIPOSS), via alternating reversible addition-fragmentation chain transfer (RAFT) polymerization. Porphyrin and POSS are installed on the amphiphilic block copolymers backbone in an alternating fashion and POSS completely inhibits the aggregation of porphyrin units via stacking...
October 14, 2018: Angewandte Chemie
Yaping Wang, Ming Yang, Junmin Qian, Weijun Xu, Jinlei Wang, Guanghui Hou, Lijie Ji, Aili Suo
Combination of chemotherapy and photodynamic therapy has emerged as a promising anticancer strategy. Polysaccharide-based nanoparticles are being intensively explored as drug carriers for different forms of combination therapy. In this study, novel multifunctional polysaccharide-based nanocomplexes were prepared from aldehyde-functionalized hyaluronic acid and hydroxyethyl chitosan via sequential self-assembly method. Stable nanocomplexes were obtained through both Schiff's base bond and electrostatic interactions...
January 1, 2019: Carbohydrate Polymers
Huajian Lin, Jincan Chen, Yaxin Zhang, Azeem Ulla, Jianyong Liu, Fan Lin, Longguang Jiang, Mingdong Huang
Antimicrobial photodynamic therapy (aPDT) is an effective way to combat infectious diseases and antibiotic resistance. Photosensitizer is a key factor of aPDT and has triggered extensive research interest. In this study, a new asymmetric Zn(II) phthalocyanine mono-substituted with a triazatricyclodecane moiety (compound 3) and its cationic N-methylated derivative (compound 4) were synthesized. Their photodynamic antimicrobial activities were evaluated using bioluminescent bacterial strains. Compound 3 showed phototoxicity only toward the Gram-positive bacteria, whereas the cationic derivative compound 4 exhibited strong anti-bacterial activity against both Gram-positive and Gram-negative strains...
October 6, 2018: Journal of Inorganic Biochemistry
Pan Yuan, Zheng Ruan, Tuanwei Li, Youliang Tian, Quan Cheng, Lifeng Yan
Tumor environmental sensitive polypeptide integrated photosensitizers is a platform for imaging-guided photodynamic therapy (PDT). However, the photosensitizer leakage during blood circulation, poor accumulation in tumor tissue and inferior quantum yield of singlet oxygen are still challenges. Herein, NHS-active boron-dipyrromethene derivative with bromine substituted NHS-BODIPY-Br2 was first synthesized, which possessed high singlet oxygen generation efficiency and near infrared (NIR) fluorescence, and then it was conjugated to a sharp pH (6...
October 11, 2018: Nanomedicine: Nanotechnology, Biology, and Medicine
Hideki Ujiie, Lili Ding, Rong Fan, Tatsuya Kato, Daiyoon Lee, Kosuke Fujino, Tomonari Kinoshita, Chang Young Lee, Thomas K Waddell, Shaf Keshavjee, Brian C Wilson, Gang Zheng, Juan Chen, Kazuhiro Yasufuku
BACKGROUND: We have developed ultra-small porphyrin-lipoprotein nanoparticles (<20nm) called "porphyrinHDL" that have a high density of porphyrin molecules and dissociate rapidly upon tumor cell accumulation to become fluorescent and photoactive. This is introduced as a novel activatable photosensitizer for image-guided photodynamic therapy (PDT). Here, we report the studies of these nanoparticles targeted to scavenger receptor class B type I (SR-BI) expressed on lung cancer cells, as a first step towards development of a minimally-invasive treatment for peripheral lung cancer and metastatic lymph nodes of advanced lung cancer...
October 11, 2018: Annals of Thoracic Surgery
S Hafner, M Ehrenfeld, A-C Neumann, Andreas Wieser
PURPOSE: Cold atmospheric pressure plasma (CAPP) is increasingly used for medical applications. The first devices are available from commercial manufactures, promising to improve wound healing and disinfection. The underlying antimicrobial mechanisms of CAPP are discussed, while the first results on its bactericidal efficiency against common bacterial species have already been published, with promising results. Most of the plasma sources used in these studies were built by the investigators themselves, and are not commercially available or licensed for clinical use...
September 19, 2018: Journal of Cranio-maxillo-facial Surgery
Xufeng Zhu, Hui Zhou, Yanan Liu, Yayu Wen, Chunfang Wei, Qianqian Yu, Jie Liu
The blood-brain barrier (BBB) and low targeting are major obstacles for the treatment of gliomas. Accordingly, overcoming the BBB and enhancing the targeting of drugs to the glioma area are key to achieving a good therapeutic effect. Here, we have developed the mesoporous ruthenium nanosystem RBT@MRN-SS-Tf/Apt with dual targeting function. Transferrin (Tf) and aptamer AS1411(Apt) are grafted on the surfaces of mesoporous ruthenium nanoparticles (MRN) with high loading capacity. This is achieved via redox-cleavable disulfide bonds, serving as both a capping agent and a targeting ligand, enabling the effective penetration of the blood-brain barrier and targeting the glioma...
October 10, 2018: Acta Biomaterialia
Hong Cheng, Rong-Rong Zheng, Gui-Ling Fan, Jing-Hao Fan, Lin-Ping Zhao, Xue-Yan Jiang, Bin Yang, Xi-Yong Yu, Shi-Ying Li, Xian-Zheng Zhang
Mitochondria and cell membrane play important roles in maintaining cellular activity and stability. Here, a single-agent self-delivery chimeric peptide based nanoparticle (designated as M-ChiP) was developed for mitochondria and plasma membrane dual-targeted photodynamic tumor therapy. Without additional carrier, M-ChiP possessed high drug loading efficacy as well as the excellent ability of producing reactive oxygen species (ROS). Moreover, the dual-targeting property facilitated the effective subcellular localization of photosensitizer protoporphyrin IX (PpIX) to generate ROS in situ for enhanced photodynamic therapy (PDT)...
October 5, 2018: Biomaterials
Hainan Yang, Zaijia Liu, Xufeng Li, Zhenfeng Zhang, Deji Chen, Hui Lian
Herein, a tumor-targeted multifunctional theranostic agent was synthetized using a facile method, combining four clinically approved materials: artesunate (Arte), human serum albumin (HSA), folic acid (FA), and indocyanine green (ICG). The obtained nanocomposites (FA-IHA NPs) showed an excellent photo- and physiological stability. The ICG in the FA-IHA NPs was used not only for near infrared (NIR) fluorescence imaging, but also for photothermal and photodynamic (PTT-PDT) therapy under a single NIR irradiation...
October 11, 2018: Nanoscale Research Letters
Zhijuan Yang, Qian Chen, Jiawen Chen, Ziliang Dong, Rui Zhang, Jingjing Liu, Zhuang Liu
Despite the promises of applying nano-photosensitizers (nano-PSs) for photodynamic therapy (PDT) against cancer, severe tumor hypoxia and limited tumor penetration of nano-PSs would lead to nonoptimized therapeutic outcomes of PDT. Therefore, herein a biocompatible nano-PS is prepared by using tamoxifen (TAM), an anti-estrogen compound, to induce self-assembly of chlorin e6 (Ce6) modified human serum albumin (HSA). The formed HSA-Ce6/TAM nanocomplexes, which are stable under neutral pH with a diameter of ≈130 nm, would be dissociated into individual HSA-Ce6 and TAM molecules under the acidic tumor microenvironment, owing to the pH responsive transition of TAM from hydrophobic to hydrophilic...
October 11, 2018: Small
Qian Wang, Jia-Mi Li, Hui Yu, Kai Deng, Wei Zhou, Cai-Xia Wang, Yang Zhang, Kun-Heng Li, Ren-Xi Zhuo, Shi-Wen Huang
Photodynamic therapy (PDT) as an alternative choice of cancer treatment method has attracted increasing attention in the past few decades. A sufficient amount of oxygen is essential for the production of singlet oxygen (1O2) in successful PDT; however, hypoxia is a typical hallmark of cancer, which is one of the most important limitation factors of PDT. To overcome the hypoxic tumour microenvironment and achieve highly efficient photodynamic cancer therapy, herein, a photosensitizer Ce6-loaded fluorinated polymeric micelle (Ce6-PFOC-PEI-M) was constructed via the self-assembly of an amphiphilic polymer prepared from perfluorooctanoic acid and branched polyethyleneimine (10 kDa)...
October 11, 2018: Biomaterials Science
Niannian Li, Fei Xu, Jiejun Cheng, Ying Zhang, Gang Huang, Jun Zhu, Xi Shen, Dannong He
Amelioration of hypoxia is an important factor increasing the effects of anti-tumor therapies. In the present experiments, nanocapsules of poly(lactide-co-glycolide)-poly(ethylene glycol)/perfluorooctyl bromide (PFOB)/photosensitizers (IR780) have been developed to increase oxygen concentration inside the tumor and improve the outcome of photodynamic therapy (PDT). PFOB has high oxygen solubility, and IR780 is a photosensitizer particularly suited for a highly effective photodynamic therapy under the 808-nm laser irradiation...
December 1, 2018: Journal of Biomedical Nanotechnology
Yu Yang, Wenjun Zhu, Liangzhu Feng, Yu Chao, Xuan Yi, Ziliang Dong, Kai Yang, Weihong Tan, Zhuang Liu, Meiwan Chen
Photodynamic therapy (PDT) is a light-triggered therapy used to kill cancer cells by producing reactive oxygen species (ROS). Herein, a new kind of DNA nanostructure based on the coordination between calcium ions (Ca2+ ) and AS1411 DNA G quadruplexes to form nanoscale coordination polymers (NCPs) is developed via a simple method. Both chlorine e6 (Ce6), a photosensitizer, and hemin, an iron-containing porphyrin, can be inserted into the G-quadruplex structure in the obtained NCPs. With further polyethylene glycol (PEG) modification, we obtain Ca-AS1411/Ce6/hemin@pHis-PEG (CACH-PEG) NCP nanostructure that enables the intranuclear transport of photosensitizer Ce6 to generate ROS inside cell nuclei that are the most vulnerable to ROS...
October 10, 2018: Nano Letters
Ruyuan Song, Dehong Hu, Ho Yin Chung, Zonghai Sheng, Shuhuai Yao
Hypoxia in solid tumors may be a hindrance to effective treatments of tumors in achieving their therapeutic potential, especially for photodynamic therapy (PDT) which requires oxygen as the supplement substrate. Oxygen delivery using perfluorocarbon emulsions or lipid oxygen microbubbles has been developed as the agents to supply endogenous oxygen to fuel singlet oxygen generation in PDT. However, such methods suffer from premature oxygen release and storage issues. To address these limitations, we designed lipid-polymer bilaminar oxygen nanobubbles with chlorin e6 (Ce6) conjugated to the polymer shell as a novel oxygen self-supplement agent for PDT...
October 9, 2018: ACS Applied Materials & Interfaces
Yongyan Deng, Fan Jia, Shengyu Chen, Zhida Shen, Qiao Jin, Guosheng Fu, Jian Ji
A glutathione (GSH)-sensitive supramolecular nitric oxide (NO) nanogenerator is developed as an all-rounder for enhanced photodynamic therapy (PDT). By integrating GSH-sensitive NO prodrug into the system via LEGO-like host-guest interaction, the nanocarrier could not only deplete intracellular GSH, but also relieve hypoxia at tumor sites through NO mediated blood vessel relaxation. Furthermore, reactive nitrogen species (RNS) with enhanced biocidal activity could be produced by the reaction between NO and reactive oxygen species (ROS), generated from α-cyclodextrin (α-CD) conjugated S-nitrosothiol and light-activated chlorin e6 (Ce6) respectively...
September 29, 2018: Biomaterials
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