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"photodynamic therapy"

Vera D Kovaleva, Anatoly B Uzdensky
No abstract text is available yet for this article.
October 1, 2016: Journal of Biomedical Optics
Renagul Abdurahman, Cheng-Xiong Yang, Xiu-Ping Yan
We report 808 nm NIR light renewable NIR persistent luminescence sensitized photodynamic therapy (PDT). Persistent luminescence provides an internal light source to generate singlet oxygen for PDT. This work paves the way for the next generation of PDT without any need for continuous external light irradiation.
October 26, 2016: Chemical Communications: Chem Comm
Liezel L Griffin, John T Lear
Non-melanoma skin cancer (NMSC) is the most common malignancy among the Caucasian population. Photodynamic therapy (PDT) is gaining popularity for the treatment of basal cell carcinoma (BCC), Bowen's disease (BD) and actinic keratosis (AK). A topical or systemic exogenous photosensitiser, results in selective uptake by malignant cells. Protoporphyrin IX (PpIX) is produced then activated by the introduction of a light source. Daylight-mediated MAL (methyl aminolaevulinate) PDT for AKs has the advantage of decreased pain and better patient tolerance...
October 22, 2016: Cancers
Nicole Maeding, Thomas Verwanger, Barbara Krammer
Photodynamic therapy (PDT) is a cancer treatment with a long-standing history. It employs the application of nontoxic components, namely a light-sensitive photosensitizer and visible light, to generate reactive oxygen species (ROS). These ROS lead to tumor cell destruction, which is accompanied by the induction of an acute inflammatory response. This inflammatory process sends a danger signal to the innate immune system, which results in activation of specific cell types and release of additional inflammatory mediators...
October 6, 2016: Cancers
Diana K Cohen, Peter K Lee
Non-melanoma skin cancer (NMSC) is traditionally treated with surgical excision. Nonsurgical methods such as cryotherapy and topical chemotherapeutics, amongst other treatments, are other options. Actinic keratosis (AKs) are considered precancerous lesions that eventually may progress to squamous cell carcinoma (SCC). Photodynamic therapy (PDT) offers an effective treatment for AKs, and is also effective for superficial basal cell carcinoma (BCC). Nodular BCC and Bowen's disease (SCC in situ) have shown acceptable response rates with PDT, although recurrence rates are higher for these two NMSC subtypes...
October 4, 2016: Cancers
Joseph G Christenbury, Nopasak Phasukkijwatana, Anna Tan, K Bailey Freund, David Sarraf
PURPOSE: To describe two cases of dome-shaped macula (DSM) and serous macular detachment, the diagnosis of which was enhanced with a radial optical coherence tomography (OCT) scanning protocol. METHODS: Retrospective case series of DSM associated with serous macular detachment. Multimodal retinal imaging was performed including spectral domain OCT with a radial scan protocol and en face OCT angiography. Anatomical outcomes before and after therapy are presented...
September 30, 2016: Retinal Cases & Brief Reports
Raziye Mohammadpour, Shahrokh Safarian, Brandon Buckway, Hamidreza Ghandehari
Polymer architecture can influence biodistribution and the mode of presentation of bioactive agents to cells. Herein delivery, loading efficiency, and mode of cellular entry of polymer conjugates of the photosensitizer Meso-Tetra (4-Carboxyphenyl) Porphyrine (MTCP) are examined when attached to hyperbranched amine terminated poly(amido amine) (PAMAM) dendrimer or random coil linear N-(2-hydroxypropyl)methacrylamide (HPMA) copolymer containing free amines in the side chains. The in vitro dark cytotoxicity and phototoxicity of MTCP and related conjugates are assessed on mouth epidermal carcinoma (KB) and human adenocarcinoma alveolar basal epithelial (A549) cells...
October 25, 2016: Macromolecular Bioscience
Kai Ma, Ruirui Xing, Ti-Feng Jiao, Guizhi Shen, Chengjun Chen, Junbai Li, Xuehai Yan
Self-assembling peptide-based materials are playing an important role in fabricating drug delivery carriers, however, they are often limited by several challenges, such as precise structure modulation, desirable nanoscale size and sufficient circulation lifetime in the body. To address this issue, herein one type of injectable dipeptide-based nanocarriers with well-modulated size and structure has been developed by adjusting glutaraldehyde (GA) assisted cationic dipeptide (CDP) assembly. After loading a model photosensitive drug (Ce6) and further decorating CDP nanoparticles (NPs) with heparin polymers (Hep), the desired dipeptide-based NPs are achieved with average diameter of 100 nm and surface charge of -25 mV, which are favorable for the enhanced permeability and retention effects...
October 25, 2016: ACS Applied Materials & Interfaces
Hui Huang, Wei Wang, Jiaqi Zou, Osamu Nakajima, Lei Zhang, Qi He, Yan Diao, Huan Liang, Lingyun Zhou, Yahui Peng
Protoporphyrin Ⅸ has been used as an efficient sensitizer in photodynamic diagnose, photodynamic therapy, and sonodynamic therapy. The level of protoporphyrin Ⅸ is very important for diagnose or therapy effects. 5-aminolevulinic acid synthase 2 (ALAS2) is the key enzyme upstream of protoporphyrin Ⅸ synthesis. To increase protoporphyrin Ⅸ accumulation, ALAS2 over-expression transgenic mice were generated. Plasmid containing alas2 gene was transfected in colonic carcinoma cell lines. Both in tissues of transgenic mice and in colonic carcinoma cells, the amount of protoporphyrin Ⅸ accumulation did increase...
October 21, 2016: Photodiagnosis and Photodynamic Therapy
Mantas Grigalavicius, Marina Juraleviciute, Mateusz Kwitniewski, A Juzeniene
BACKGROUND: Senescent cells, which are resistant to apoptosis, accumulate with age and after ultraviolet (UV) radiation, chemotherapy and radiation therapy. Preventing or eliminating senescent cells may be crucial for protection against skin cancer development and improving tumour treatment. The aim of the present study was to investigate the potential of photodynamic therapy (PDT) with 5-aminolevulinic acid (ALA) to induce senescence in skin cancer cells and to eliminate senescent cells induced by chemotherapy (bleomycin) or UVA (315-400nm) exposure...
October 21, 2016: Photodiagnosis and Photodynamic Therapy
Albert W Girotti, Jonathan M Fahey, Witold Korytowski
Photodynamic therapy (PDT) is a unique site-specific treatment for eradicating a variety of solid tumors, including prostate, lung, bladder, and brain tumors. PDT is a three-component modality involving (i) administration of a photosensitizing agent (PS), (ii) PS photoexcitation by visible or near-infrared light, and (iii) molecular oxygen. Upon photoexcitation, PS gives rise to tumor-damaging reactive oxygen species, most prominently singlet oxygen (1O2). Previous studies revealed that endogenous nitric oxide (NO) in various mouse tumor models significantly reduced PDT effectiveness...
2016: Current Medicinal Chemistry
Shi Gao, Guohao Wang, Zainen Qin, Xiangyu Wang, Guoqing Zhao, Qingjie Ma, Lei Zhu
Photodynamic therapy (PDT) is a promising tumor treatment modality that can convert oxygen into cytotoxic singlet oxygen (SO) via photosensitizer to ablate tumor growth. However, the uncontrolled cancer cell proliferation during tumor development and the oxygen consumption during PDT always result in an insufficient oxygen level in tumors, which can adversely affect the PDT efficiency in turn. We designed an oxygen-generating PDT nanocomplex by encapsulating a manganese dioxide nanoparticle (MnO2 NP) in an indocyanine green (ICG) modified hyaluronic acid nanoparticle (HANP) to overcome this limitation...
October 19, 2016: Biomaterials
Jean-Baptiste Tylcz, Thierry Bastogne, Alexia Bourguignon, Celine Frochot, Muriel Barberi-Heyob
: Photodynamic therapy (PDT) is an alternative treatment for cancer that involves the administration of a photosensitizing agent, which is activated by light at a specific wavelength. This illumination causes after a sequence of photoreactions, the production of reactive oxygen species responsible for the death of the tumor cells but also the degradation of the photosensitizing agent, which then loose the fluorescence properties. The phenomenon is commonly known as photobleaching process and can be considered as a therapy efficiency indicator...
October 21, 2016: IEEE Transactions on Bio-medical Engineering
Albert W Girotti
Nitric oxide (NO) produced by nitric oxide synthase (NOS) enzymes is a free radical molecule involved in a wide variety of normophysiologic and pathophysiologic processes. Included in the latter category are cancer promotion, progression, and resistance to therapeutic intervention. Animal tumor photodynamic therapy (PDT) studies several years ago revealed that endogenous NO can reduce PDT efficacy and that NOS inhibitors can alleviate this. Until relatively recently, little else was known about this anti-PDT effect of NO, including: (a) the underlying mechanisms; (b) type(s) of NOS involved; and (c) whether active NO was generated in vascular cells, tumor cells, or both...
October 20, 2016: Cancers
Takuro Ikeuchi, John Mack, Tebello A Nyokong, Nagao Kobayashi, Mutsumi Kimura
A water-soluble zinc phthalocyanine (ZnPc) complex with four negatively charged electron-withdrawing sulfonic acid substituents at the non-peripheral positions (-ZnTSPc) is found to have a high singlet oxygen (1O2) quantum yield and displays high photostability, since the formation of aggregates is hindered and the HOMO is significantly stabilized, this making -ZnTSPc potentially suitable for use as a photosensitizer for photodynamic therapy and photoimmunotherapy. Atomic force microscopy (AFM) reveals that mixtures of the negatively charged -ZnTSPc complex with a similar positively charged ZnPc were found to result in the self-assembly of one-dimensional accordion-like fibers...
October 24, 2016: Langmuir: the ACS Journal of Surfaces and Colloids
Baomei Zhang, Yang Wang, Jiyong Liu, Guangxi Zhai
Graphene-based nanomaterials have drawn abundant interest in various fields such as biomedicine in recent years, thanks to their unique physico-chemical properties. Due to the ultra-high surface area of single-layered graphene, higher molecular loading is obtained. In addition, easy modifications are acquired because of its ample oxygen-content functional groups. Based on the above talking advantages, graphene-based nanomaterials have been widely explored as novel nano-vectors for disease theranostics. In this article, we give a comprehensive review about graphene-based nanomaterials, including introduction about different members of graphene family nanomaterials (GFNs), various modifications, toxicity and biomedical applications of graphene-based derivatives...
October 19, 2016: Current Medicinal Chemistry
Hao Wu, Fang Zeng, Hang Zhang, Jiangsheng Xu, Jianrong Qiu, Shuizhu Wu
The applications of photodynamic therapy (PDT) are usually limited by photosensitizers' side effects and singlet oxygen's short half-life. Herein, a mitochondria-targeted nanosystem is demonstrated to enhance the PDT efficacy by releasing a bio-precursor of photosensitizer under two-photon irradiation. A phototriggerable coumarin derivative is first synthesized by linking 5-aminolevulinic acid (5-ALA, the bio-precursor) to coumarin; and the nanosystem (CD-ALA-TPP) is then fabricated by covalently incorporating this coumarin derivative and a mitochondria-targeting compound triphenylphosphonium (TPP) onto carbon dots (CDs)...
February 2016: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
Ismail Ocsoy, Nuran Isiklan, Sena Cansiz, Nalan Özdemir, Weihong Tan
Aptamer-functionalized magnetic graphene oxide conjugates loaded with indocyanine green (ICG) dye, or Apt@ICG@mGO, have been successfully developed for dual-targeted photothermal and photodynamic therapy. In general, a drug or its carrier or their dosage can be imprtant important issues in terms of toxicity. However, in this system, each component used is quite safe, biocompatibe and clean. For instance, ICG, a Food and Drug Administration (FDA) approved near-infrared (NIR) dye, serves as both a photothermal and photodynamic agent...
2016: RSC Advances
Wei Cui, Anhe Wang, Jie Zhao, Junbai Li
Polyelectrolyte multilayer capsules have become a novel and promising class of hybrid materials with great potential since they can be applied in various areas, such as pharmaceutical sciences, biotechnology, and biomedicine. The concept of using such carriers for biology application is diagnosis and treatment of diseases for convenience, safety and specific targeting. Therefore, the development of biocompatible, biodegradable and specific characteristic nanostructure material is highly desirable. Much effort has been devoted to exploring innovative and effective techniques to fabricate such materials...
October 6, 2016: Advances in Colloid and Interface Science
Fabio Camacho-Alonso, P Salmerón-Lozano, Y Martínez-Beneyto
The aim of this study was to evaluate the antibacterial effect of photodynamic therapy (PDT), 2 % chlorhexidine (CHX). The teeth were contaminated with 0.1 mL Enterococcus faecalis (3 × 10(8) cell/mL) and randomized into eight treatment groups: Group 1 (2.5 % NaOCl); Group 2 (PDT); Group 3 (2 % CHX); Group 4 (TAM); Group 5 (propolis), Group 6 (ozone), Group 7 (positive control) and Group 8 (negative control). Following treatment, the canal content was sampled. The samples were cultured in triplicate on blood agar plates to determine the number of colony forming units (CFU)/mL...
October 22, 2016: Odontology
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