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Photodynamic therapy cancer

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https://www.readbyqxmd.com/read/28236685/conjugation-of-chlorins-with-spermine-enhances-phototoxicity-to-cancer-cells-in-vitro
#1
Mariia Darmostuk, Michal Jurášek, Kamila Lengyel, Jaroslav Zelenka, Michaela Rumlová, Pavel Drašar, Tomáš Ruml
Photodynamic therapy (PDT) is one of the most promising methods of specific cancer treatment. However, commercially available photosensitizers (PSs) show significant drawbacks, such as side toxicity, low penetration ability, low blood solubility, low tumor selectivity etc. In addition, as was shown previously, a conjugation of polyamines with several toxic agents led to an increased toxicity to cancer cells. Here, we synthesized conjugates of two chlorine photosensitizers, purpurin 18 and pheophorbide a, with spermine in natural and Boc-protected form...
February 17, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28230915/a-singlet-oxygen-generating-agent-by-chirality-dependent-plasmonic-shell-satellite-nanoassembly
#2
Fengli Gao, Maozhong Sun, Wei Ma, Xiaoling Wu, Liqiang Liu, Hua Kuang, Chuanlai Xu
Photodynamic therapy (PDT) agent, which generates singlet oxygen ((1) O2 ) under light, has attracted significant attention for its broad biological and medical applications. Here, DNA-driven shell-satellite (SS) gold assemblies as chiral photosensitizers are first fabricated. The chiral plasmonic nanostructure, coupling with cysteine enantiomers on its surface, exhibits intense chiroplasmonic activities (-40.2 ± 2.6 mdeg) in the visible region. These chiral SS nanoassemblies have high reactive oxygen species generating efficiency under circular polarized light illumination, resulting in a (1) O2 quantum yield of 1...
February 23, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28225978/daylight-photodynamic-therapy-experience-and-safety-in-treatment-of-actinic-keratoses-of-the-face-and-scalp-in-low-latitude-and-high-brightness-region
#3
Luiz Eduardo Garcia Galvão, Heitor de Sá Gonçalves, Karine Paschoal Botelho, Juliana Chagas Caldas
Daylight photodynamic therapy has been used in countries with high latitudes during the summer for actinic keratoses treatment with reports of similar efficacy to conventional photodynamic therapy. We evaluate its safety in 20 patients in the city of Fortaleza, a local with low latitude and high brightness. Sixteen patients did not report any discomfort due to the procedure. Daylight photodynamic therapy is an easy application method with great tolerability by the patient and has the possibility of being performed throughout the year in these regions...
January 2017: Anais Brasileiros de Dermatologia
https://www.readbyqxmd.com/read/28225139/redox-and-light-responsive-alginate-nanoparticles-as-effective-drug-carriers-for-combinational-anticancer-therapy
#4
Chuangnian Zhang, Gaona Shi, Ju Zhang, Jinfeng Niu, Pingsheng Huang, Zhihong Wang, Yanming Wang, Weiwei Wang, Chen Li, Deling Kong
Nanoparticles have been extensively explored as effective means to deliver chemotherapeutic agents or photosensitizers for chemotherapy or photodynamic therapy (PDT) against cancer. In the present work, pheophorbide A (PheoA), a hydrophobic photosensitizer, was conjugated via a redox-sensitive disulfide linkage to alginate (PheoA-ALG). Anticancer agent, doxorubicin (DOX), was also loaded within the PheoA-ALG nanoparticles (DOX/PheoA-ALG NPs) and used as drug carriers for combinational antitumor treatment. The DOX/PheoA-ALG NPs were spherical in shape with a uniform diameter of approximately 210 nm...
February 22, 2017: Nanoscale
https://www.readbyqxmd.com/read/28224799/preparation-and-practical-applications-of-2-7-dichlorodihydrofluorescein-in-redox-assays
#5
Megan J Reiniers, Rowan F van Golen, Sylvestre Bonnet, Mans Broekgaarden, Thomas M van Gulik, Maarten R Egmond, Michal Heger
Oxidative stress, a state in which intra- or extracellular oxidant production outweighs the antioxidative capacity, lies at the basis of many diseases. DCFH2-DA (2',7'-dichlorodihydorfluorescein diacetate) is the most widely used fluorogenic probe for the detection of general oxidative stress. However, the use of DCFH2-DA, as many other fluorogenic redox probes, is mainly confined to the detection of intracellular oxidative stress in vitro. To expand the applicability of the probe, an alkaline hydrolysis and solvent extraction procedure was developed to generate high-purity DCFH2 (2',7'-dichlorodihydorfluorescein) from DCFH2-DA using basic laboratory equipment...
February 22, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28223166/efficacy-of-photochemical-internalisation-using-disulfonated-chlorin-and-porphyrin-photosensitisers-an-in-vitro-study-in-2d-and-3d-prostate-cancer-models
#6
Alejandra Martinez de Pinillos Bayona, Josephine H Woodhams, Hayley Pye, Rifat A Hamoudi, Caroline M Moore, Alexander J MacRobert
This study shows the therapeutic outcome of Photochemical Internalisation (PCI) in prostate cancer in vitro surpasses that of Photodynamic Therapy (PDT) and could improve prostate PDT in the clinic, whilst avoiding chemotherapeutics side effects. In addition, the study assesses the potential of PCI with two different photosensitisers (TPCS2a and TPPS2a) in prostate cancer cells (human PC3 and rat MatLyLu) using standard 2D monolayer culture and 3D biomimetic model. Photosensitisers were used alone for photodynamic therapy (PDT) or with the cytotoxin saporin (PCI)...
February 18, 2017: Cancer Letters
https://www.readbyqxmd.com/read/28222225/daylight-photodynamic-therapy-vs-conventional-photodynamic-therapy-as-skin-cancer-preventive-treatment-in-patients-with-face-and-scalp-cancerization-an-intra-individual-comparison-study
#7
Elena Sotiriou, Demetrios Ioannides, Fotini Vrani, Elizabeth Lazaridou, Efstratios Vakirlis, Aimilios Lallas, Zoe Apalla
BACKGROUND: Individuals with medical history of non-melanoma skin cancers (NMSCs) usually develop multiple and/or recurrent malignant lesions around the site of the primary neoplasm. The latter represents the clinical expression of the "field cancerization" theory; supporting the presence of multiple malignant clones of dysplastic keratinocytes over the entire epithelium that potentially can progress into clinical lesions. Taking into consideration that the burden of NMSCs on public health and health-care cost is high, adequate control of recurrences and management of field change is challenging...
February 21, 2017: Journal of the European Academy of Dermatology and Venereology: JEADV
https://www.readbyqxmd.com/read/28220697/near-infrared-activated-upconversion-nanoprobes-for-sensitive-endogenous-zn2-detection-and-selective-on-demand-photodynamic-therapy
#8
Ping Hu, Rui Wang, Lei Zhou, Lei Chen, Qingsheng Wu, Ming-Yong Han, Ahmed Mohamed El-Toni, Dongyuan Zhao, Fan Zhang
As a light-activated non-invasive cancer treatment paradigm, photodynamic therapy (PDT) has been attracting extensive attentions because of its high treatment efficacy and low side effects. Especially, spatiotemporal control of singlet oxygen (1O2) release is highly desirable for realizing on-demand PDT, which, however, still remains a huge challenge. To address this issue, a novel switchable near infrared (NIR)-responsive upconversion nanoprobe has been firstly designed and successfully applied for controlled PDT that can be optically activated by tumor-associated disruption of labile Zn2+ (denoted as Zn2+ in the following words) homeostasis stimuli...
February 21, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28218708/oncologic-photodynamic-therapy-basic-principles-current-clinical-status-and-future-directions
#9
REVIEW
Demian van Straten, Vida Mashayekhi, Henriette S de Bruijn, Sabrina Oliveira, Dominic J Robinson
Photodynamic therapy (PDT) is a clinically approved cancer therapy, based on a photochemical reaction between a light activatable molecule or photosensitizer, light, and molecular oxygen. When these three harmless components are present together, reactive oxygen species are formed. These can directly damage cells and/or vasculature, and induce inflammatory and immune responses. PDT is a two-stage procedure, which starts with photosensitizer administration followed by a locally directed light exposure, with the aim of confined tumor destruction...
February 18, 2017: Cancers
https://www.readbyqxmd.com/read/28218672/photodynamic-synergistic-effect-of-pheophorbide-a-and-doxorubicin-in-combined-treatment-against-tumoral-cells
#10
Rubén Ruiz-González, Paula Milán, Roger Bresolí-Obach, Juan Carlos Stockert, Angeles Villanueva, Magdalena Cañete, Santi Nonell
A combination of therapies to treat cancer malignancies is at the forefront of research with the aim to reduce drug doses (ultimately side effects) and diminish the possibility of resistance emergence given the multitarget strategy. With this goal in mind, in the present study, we report the combination between the chemotherapeutic drug doxorubicin (DOXO) and the photosensitizing agent pheophorbide a (PhA) to inactivate HeLa cells. Photophysical studies revealed that DOXO can quench the excited states of PhA, detracting from its photosensitizing ability...
February 17, 2017: Cancers
https://www.readbyqxmd.com/read/28215969/focal-photodynamic-intracellular-acidification-as-a-cancer-therapeutic
#11
REVIEW
Matthew J Gdovin, Nuha Kadri, Lourdes Rios, Steven Holliday, Zachary Jordan
Cancer cells utilize an array of proton transporters to regulate intra- and extracellular pH to thrive in hypoxic conditions, and to increase tumor growth and metastasis. Efforts to target many of the transporters involved in cancer cell pH regulation have yielded promising results, however, many productive attempts to disrupt pH regulation appear to be non-specific to cancer cells, and more effective in some cancer cells than others. Following a review of the status of photodynamic cancer therapy, a novel light-activated process is presented which creates very focal, rapid, and significant decreases in only intracellular pH (pHi), leading to cell death...
February 12, 2017: Seminars in Cancer Biology
https://www.readbyqxmd.com/read/28214620/water-soluble-multifunctional-antibody-porphyrin-gold-nanoparticles-for-targeted-photodynamic-therapy
#12
Oriol Penon, María J Marín, David A Russell, Lluïsa Pérez-García
Photodynamic therapy (PDT) is a treatment of cancer by which tumour cells are destroyed using reactive oxygen species produced by photosensitizers following activation with visible or near infrared light. Successful PDT depends on the solubility and the targeting ability of the photosensitizers. In this work, the synthesis of a porphyrin-based water soluble nanoparticle conjugate containing a targeting agent that recognizes the erbB2 receptor overexpressed on the surface of particular cancer cells is reported...
February 8, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28214608/near-infrared-activatable-phthalocyanine-poly-l-glutamic-acid-conjugate-increased-cellular-uptake-and-light-dark-toxicity-ratio-towards-an-effective-photodynamic-cancer-therapy
#13
Lik Voon Kiew, Hoay Yan Cheah, Siew Hui Voon, Elena Gallon, Julie Movellan, Kia Hui Ng, Serkan Alpugan, Hong Boon Lee, Fabienne Dumoulin, María J Vicent, Lip Yong Chung
In photodynamic therapy (PDT), the low absorptivity of photosensitizers in an aqueous environment reduces singlet oxygen generation efficiency and thereby decreases photosensitizing efficacy in biological conditions. To circumvent this problem, we designed a phthalocyanine-poly-L-glutamic acid conjugate (1-PG) made from a new phthalocyanine (Pc 1) monofunctionalized to allow adequate conjugation to PGA. The resulting 1-PG conjugate retained high absorptivity in the near-infrared (NIR) region at its λmax 675nm in an aqueous environment...
February 15, 2017: Nanomedicine: Nanotechnology, Biology, and Medicine
https://www.readbyqxmd.com/read/28212527/a-multicenter-phase-ii-study-of-salvage-photodynamic-therapy-using-talaporfin-sodium-me2906-and-a-diode-laser-pnl6405epg-for-local-failure-after-chemoradiotherapy-or-radiotherapy-for-esophageal-cancer
#14
Tomonori Yano, Hiroi Kasai, Takahiro Horimatsu, Kenichi Yoshimura, Satoshi Teramukai, Satoshi Morita, Harue Tada, Yoshinobu Yamamoto, Hiromi Kataoka, Naomi Kakushima, Ryu Ishihara, Hajime Isomoto, Manabu Muto
Photodynamic therapy (PDT) showed promising efficacy for local failure after chemoradiotherapy (CRT) for esophageal cancer. However, PDT required long sun shade period. This study aimed to evaluate the safety and efficacy of PDT using second generation photosensitizer, talaporfin sodium for local failure after CRT. This was the multi-institutional non-randomized phase II study. Patients with histologically proven local failure limited within the muscularis propria after 50Gy or more radiotherapy (RT) for esophageal cancer were eligible...
December 20, 2016: Oncotarget
https://www.readbyqxmd.com/read/28212271/carbon-nanotubes-as-an-effective-opportunity-for-cancer-diagnosis-and-treatment
#15
REVIEW
Alessandro Sanginario, Beatrice Miccoli, Danilo Demarchi
Despite the current progresses of modern medicine, the resistance of malignant tumors to present medical treatments points to the necessity of developing new therapeutic approaches. In recent years, numerous studies have focused their attention on the promising use of nanomaterials, like iron oxide nanowires, zinc oxide or mesoporous silica nanoparticles, for cancer and metastasis treatment with the advantage of operating directly at the bio-molecular scale. Among them, carbon nanotubes emerged as valid candidates not only for drug delivery, but also as a valuable tool in cancer imaging and physical ablation...
February 15, 2017: Biosensors
https://www.readbyqxmd.com/read/28205400/design-features-for-optimization-of-tetrapyrrole-macrocycles-as-antimicrobial-and-anticancer-photosensitizers
#16
EDITORIAL
Alejandra Martinez De Pinillos Bayona, Pawel Mroz, Connor Thunshelle, Michael R Hamblin
Photodynamic therapy (PDT) uses non-toxic dyes called photosensitizers (PS) and harmless visible light that combine to form highly toxic reactive oxygen species that kill cells. Originally, a cancer therapy, PDT, now includes applications for infections. The most widely studied PS are tetrapyrrole macrocycles including porphyrins, chlorins, bacteriochlorins, and phthalocyanines. The present review covers the design features in PS that can work together to maximize the PDT activity for various disease targets...
February 2017: Chemical Biology & Drug Design
https://www.readbyqxmd.com/read/28203076/light-triggered-liposomal-cargo-delivery-platform-incorporating-photosensitizers-and-gold-nanoparticles-for-enhanced-singlet-oxygen-generation-and-increased-cytotoxicity
#17
Zofia Kautzka, Sandhya Clement, Ewa M Goldys, Wei Deng
We developed light-triggered liposomes incorporating 3-5 nm hydrophobic gold nanoparticles and Rose Bengal (RB), a well-known photosensitizer used for photodynamic therapy. Singlet oxygen generated by these liposomes with 532 nm light illumination was characterized for varying the molar ratio of lipids and gold nanoparticles while keeping the amount of RB constant. Gold nanoparticles were found to enhance the singlet oxygen generation rate, with a maximum enhancement factor of 1.75 obtained for the molar ratio of hydrogenated soy l-α-phosphatidylcholine:1,2-dioleoyl-sn-glycero-3-phosphoethanolamine-N-(hexanoylamine):gold of 57:5:17 compared with liposomes loaded with RB alone...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28201971/tio2-based-mitoxantrone-imprinted-poly-methacrylic-acid-co-polycaprolctone-diacrylate-nanoparticles-as-a-drug-delivery-system
#18
Maryam Bakhshizadeh, Ameneh Sazgarnia, Mahmoud Seifi, Farzin Hadizadeh, Ghadir Rajabzadeh, Seyed Ahmad Mohajeri
BACKGROUND: Light delivery in photodynamic therapy is a challenging issue in deep cancer treatment. To solve this problem, photosensitizers are conjugated to X-ray luminescent nanoparticles. When the complexes are stimulated by X-rays during radiotherapy, the nanoparticles generate light and activate the photosensitizers. METHODS: Core-shell molecularly imprinted polymers (MIPs) were prepared against mitoxantrone (MX) in which TiO2 nanoparticles were applied as a core, diacrylated polycaprolctone as a biodegradable cross-linker and methacrylic acid (MAA) or 4-vinylpyridin (4-VP) as the functional monomer...
February 14, 2017: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/28198587/hexaphyrin-as-a-potential-theranostic-dye-for-photothermal-therapy-and-19f-magnetic-resonance-imaging
#19
Tomohiro Higashino, Hirotaka Nakatsuji, Ryosuke Fukuda, Haruki Okamoto, Hirohiko Imai, Tetsuya Matsuda, Hidehito Tochio, Masahiro Shirakawa, Nikolai Tkachenko, Mitsuru Hashida, Tatsuya Murakami, Hiroshi Imahori
meso-Aryl substituted expanded porphyrins have two potential key features suitable for theranostic agents, excellent absorption in near infrared (NIR) region and possible introduction of multiple fluorine atoms at structurally nearly equivalent positions. Herein, hexaphyrin (hexa) was synthesized using 2,6-bis(trifluoromethyl)-4-formyl benzoate and pyrrole and evaluated as a novel theranostic expanded porphyrin possessing the above key features. Under NIR light illumination hexa showed intense photothermal and weak photodynamic effects, which were most likely due to its low-lying excited states close to a singlet oxygen...
February 15, 2017: Chembiochem: a European Journal of Chemical Biology
https://www.readbyqxmd.com/read/28198007/modulating-tumor-hypoxia-by-nanomedicine-for-effective-cancer-therapy
#20
REVIEW
Rana Jahanban-Esfahlan, Miguel de la Guardia, Delshad Ahmadi, Bahman Yousefi
Hypoxia, a characteristic feature of tumors, is indispensable to tumor angiogenesis, metastasis, and multi drug resistance. Hypoxic avascular regions, deeply embedded inside the tumors significantly hinder delivery of therapeutic agents. The low oxygen tension results in resistance to the current applied anti-cancer therapeutics including radiotherapy, chemotherapy and photodynamic therapy, the efficacy of which is firmly tied to the level of tumor oxygen supply. However, emerging data indicate that nanocarriers/nanodrugs can offer substantial benefits to improve the efficacy of current therapeutics, through modulation of tumor hypoxia...
February 15, 2017: Journal of Cellular Physiology
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