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https://www.readbyqxmd.com/read/28088439/antimicrobial-activity-of-photodynamic-therapy-in-combination-with-colistin-against-a-pan-drug-resistant-acinetobacter-baumannii-isolated-from-burn-patient
#1
Ebrahim Boluki, Hossein Kazemian, Hadi Peeridogaheh, Mohammad Yousef Alikhani, Sima Shahabi, Leili Beytollahi, Roghayeh Ghorbanzadeh
Nosocomially-acquired multi-, extensively-, and pandrug resistant (MDR, XDR, and PDR) strains of microorganisms such as Acinetobacter baumannii remain a serious cause of infection and septic mortality in burn patients. Treatment of patients with nosocomial burn wound infections is often complicated by drug-resistant strains of A. baumannii. Today, many researchers are focusing on the investigation of novel non-antibiotic strategies such as photodynamic therapy (PDT). We report a new PDT strategy that suppresses colistin resistance in PDR A...
January 11, 2017: Photodiagnosis and Photodynamic Therapy
https://www.readbyqxmd.com/read/28088174/feasibility-and-safety-of-dilatational-tracheotomy-using-the-rigid-endoscope-a-multicenter-study
#2
Andreas Nowak, Peter Kern, Sven Koscielny, Taras I Usichenko, Klaus Hahnenkamp, Markus Jungehülsing, Matthias Tittel, Jens Oeken, Eckart Klemm
BACKGROUND: Fiberoptic tracheo-bronchoscopy is the most commonly used procedure for percutaneous dilational tracheotomy (PDT). However, PDT can be associated with major complications, including death. Furthermore it is unclear, whether the tracheal ring fractures may contribute to the development of tracheal stenosis after PDT nor whether tracheal ring fractures can be prevented by using a rigid endoscope for this procedure. The purpose of this study was to evaluate the feasibility of and the incidence of complications for PDT using the rigid tracheotomy endoscope (TED)...
January 14, 2017: BMC Anesthesiology
https://www.readbyqxmd.com/read/28087315/assessing-light-independent-effects-of-hypericin-on-cell-viability-ultrastructure-and-metabolism-in-human-glioma-and-endothelial-cells
#3
Veronika Huntosova, Marta Novotova, Zuzana Nichtova, Lucia Balogova, Maria Maslanakova, Dana Petrovajova, Katarina Stroffekova
Cell exposure to light-independent effects of photosensitizers (PS) used in PDT is clinically relevant when PS affect the pro-apoptotic cascade.In many malignant cells, Hypericin (Hyp) has PS displayed light-dependent anti-proliferative and cytotoxic effects with no cytotoxicity in the dark. Recent studies have shown that Hyp also exhibited light-independent cytotoxic effects in a wide range of concentrations. The molecular mechanisms underlying Hyp light-independent (dark) toxicity may be due to its interaction with different molecules at the Hyp accumulation sites including mitochondria, and these mechanisms are not understood in detail...
January 10, 2017: Toxicology in Vitro: An International Journal Published in Association with BIBRA
https://www.readbyqxmd.com/read/28074819/percutaneous-tracheostomy
#4
REVIEW
Chitra Mehta, Yatin Mehta
Percutaneous dilatational tracheostomy (PDT) is a commonly performed procedure in critically sick patients. It can be safely performed bedside by intensivists.This has resulted in decline in the use of surgical tracheostomy in intensive care unit (ICU) except in few selected cases. Most common indication of tracheostomy in ICU is need for prolonged ventilation. About 10% of patients requiring at least 3 days of mechanical ventilator support get tracheostomised during ICU stay. The ideal timing of PDT remains undecided at present...
January 2017: Annals of Cardiac Anaesthesia
https://www.readbyqxmd.com/read/28071592/development-and-evaluation-of-zinc-phthalocyanine-nanoemulsions-for-use-in-photodynamic-therapy-for-leishmania-spp
#5
Luciana Betzler de Oliveira de Siqueira, Verônica da Silva Cardoso, Igor Almeida Rodrigues, Ana Lúcia Vazquez-Villa, Elisabete Pereira Dos Santos, Bruno da Costa Leal Ribeiro Guimarães, Cristal Dos Santos Cerqueira Coutinho, Alane Beatriz Vermelho, Eduardo Ricci Junior
Photodynamic therapy (PDT) combines light with photosensitizers (PS) for production of reactive oxygen species (ROS) that can kill infectious microorganisms such as bacteria, fungi and protozoa. The application of nanotechnology has enabled the advancement of PDT because many PS are insoluble in water, necessitating a nanocarrier as a physiologically acceptable carrier. Nanoemulsions are efficient nanocarriers for solubilizing liposoluble drugs, like the PS, in water. Cutaneous (CL) and mucocutaneous leishmaniasis (ML) are caused by different species of the genus Leishmania, transmitted to humans by sandfly bites...
February 10, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28070573/nanoparticle-delivery-of-wnt-1-sirna-enhances-photodynamic-therapy-by-inhibiting-epithelial-mesenchymal-transition-for-oral-cancer
#6
Chuan Ma, Leilei Shi, Yu Huang, Lingyue Shen, Hao Peng, Xinyuan Zhu, Guoyu Zhou
Activation of the epithelial to mesenchymal transition (EMT) in photodynamic therapy (PDT) can lead to the recurrence and progression of tumors. To enhance the effects of PDT, it is essential to inhibit the Wnt/β-catenin signaling pathway involved in EMT progression. Herein, we used polyethylene glycol-polyethyleneimine-chlorin e6 (PEG-PEI-Ce6) nanoparticles to efficiently deliver Wnt-1 small interfering RNA (siRNA) to the cytoplasm of KB cells (oral squamous cell carcinoma) that were subjected to PDT. Wnt-1 siRNA effectively inhibited the Wnt/β-catenin signaling pathway, reducing the expression of Wnt-1, β-catenin and vimentin that are crucial to the EMT...
January 10, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28070104/comparative-photodynamic-therapy-cytotoxicity-of-mannose-conjugated-chlorin-and-talaporfin-sodium-in-cultured-human-and-rat-cells
#7
Yo Shinoda, Tsutomu Takahashi, Jiro Akimoto, Megumi Ichikawa, Hiromi Yamazaki, Atsushi Narumi, Shigenobu Yano, Yasuyuki Fujiwara
Photodynamic therapy (PDT) is a Food and Drug Administration authorized method for cancer treatment, which uses photosensitizer and laser photo-irradiation to generate reactive oxygen species to induce cell death in tumors. Photosensitizers have been progressively developed, from first to third generation, with improvements in cell specificity, reduced side effects and toxicity, increased sensitivity for irradiation and reduced persistence of photosensitizer in healthy cells. These improvements have been achieved by basic comparative experiments between current and novel photosensitizers using cell lines; however, photosensitizers should be carefully evaluated because they may have cell type specificity...
2017: Journal of Toxicological Sciences
https://www.readbyqxmd.com/read/28068186/bactericidal-efficacy-of-photodynamic-therapy-and-chitosan-in-root-canals-experimentally-infected-with-enterococcus-faecalis-an-in-vitro-study
#8
Fabio Camacho-Alonso, Encarnación Julián-Belmonte, Fernando Chiva-García, Yolanda Martínez-Beneyto
OBJECTIVE: To evaluate the antibacterial efficacy of photodynamic therapy (PDT) and chitosan against Enterococcus faecalis and assess the possible enhancive effect of chitosan on the photosensitizer methylene blue in experimentally infected root canals of extracted human teeth in vitro. BACKGROUND DATA: E. faecalis is frequently found in persistent endodontic infections. In this context, the antimicrobial PDT or newer antibacterial alternatives such as chitosan could become modern alternatives to existing antibacterial treatment approaches...
January 9, 2017: Photomedicine and Laser Surgery
https://www.readbyqxmd.com/read/28068182/improvement-of-antibacterial-efficacy-through-synergistic-effect-in-photodynamic-therapy-based-on-thiazinium-chromophores-against-planktonic-and-biofilm-associated-periodontopathogens
#9
Eva-Maria Decker, Valentin Bartha, Christiane von Ohle
OBJECTIVE: Aim of the study was to improve the antibacterial efficacy of toluidine blue (TBO)/methylene blue (MB)-mediated photodynamic systems with light-emitting diode (LED) or laser irradiation administered to planktonic and biofilm-associated periodontopathogens. BACKGROUND DATA: Antibacterial photodynamic therapy (PDT) is a common, noninvasive adjunctive clinical method to inactivate microorganisms. So far, the disadvantage of this method has been its limited effectiveness in eliminating pathogens...
January 9, 2017: Photomedicine and Laser Surgery
https://www.readbyqxmd.com/read/28068066/gold-nanospheres-stabilized-indocyanine-green-as-a-synchronous-photodynamic-photothermal-therapy-platform-that-inhibits-tumor-growth-and-metastasis
#10
Wei Li, Hanbo Zhang, Xiaomeng Guo, Zuhua Wang, Fenfen Kong, Lihua Luo, Qingpo Li, Chunqi Zhu, Jie Yang, Yan Lou, Yong-Zhong Du, Jian You
Both photothermal therapy (PTT) and photodynamic therapy (PDT) are phototherapeutic approaches, which have been widely investigated for cancer therapy mediated by external light source. Here, a nanosystem presenting synchronous PTT and PDT effect realized through one-step near infrared (NIR) light irradiation is reported. This system was fabricated by conjugating indocyanine green (ICG) on hollow gold nanospheres (HAuNS) using branched-polyethylenimine (PEI, MW=10 kDa) as optimal linker, which provided a high ICG payload as well as a covering layer with suitable thickness on HAuNS to maintain ICG fluorescence and reactive oxygen species (ROS) productivity...
January 9, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28067928/near-infrared-light-mediated-enhancement-of-reactive-oxygen-species-generation-through-electron-transfer-from-graphene-oxide-to-iron-hydroxide-oxide
#11
Yue He, Andrea Del Valle, Yu Qian, Yu-Fen Huang
Clinical applications of current photodynamic therapy (PDT) agents are often restricted to be activated only by UV and visible light, which have very poor tissue penetration depths. In this study, a new near infrared (NIR)-absorbing nanoagent based on graphene oxide decorated with iron hydroxide/oxide (GO-FeOxH) was developed for light-activated nanomaterial-mediated PDT. This nanocomposite, GO-FeOxH was prepared via the one-step electrooxidation of iron nails in an aqueous GO solution. The as-prepared GO-FeOxH showed a much higher reactive oxygen species (ROS) activity under NIR light irradiation than GO...
January 9, 2017: Nanoscale
https://www.readbyqxmd.com/read/28067486/photocrosslinkable-polymer-dots-with-stable-sensitizer-loading-and-amplified-singlet-oxygen-generation-for-photodynamic-therapy
#12
Ying Tang, Haobin Chen, Kaiwen Chang, Zhihe Liu, Yu Wang, Songnan Qu, Hong Xu, Changfeng Wu
Photodynamic therapy (PDT) is a promising treatment modality for clinical cancer therapy. However, the therapeutic effect of PDT is strongly dependent on the property of photosensitizer. Here, we developed photocrosslinkable semiconductor polymer dots doped with photosensitizer Chlorin e6 (Ce6) to construct a nanoparticle platform for photodynamic therapy. Photo-reactive oxetane groups were attached to the side chains of the semiconductor polymer. After photocrosslinking reaction, the Ce6-doped Pdots formed an interpenetrated structure to prevent Ce6 leaching out from the Pdot matrix...
January 9, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28067380/a-single-light-triggered-and-dual-imaging-guided-multifunctional-platform-for-combined-photothermal-and-photodynamic-therapy-based-on-td-controlled-and-icg-loaded-cus-msio2
#13
Qing You, Qi Sun, Jinping Wang, Xiaoxiao Tan, Xiaojuan Pang, Li Liu, Meng Yu, Fengping Tan, Nan Li
Near-infrared (NIR)-responsive drug delivery systems have received enormous attention because of their good biocompatibility and high biological penetration. In this work, we report a novel 1-tetradecanol (TD)-controlled and indocyanine green (ICG)-loaded CuS@mSiO2 phototherapy nanoplatform (CuS@mSiO2-TD/ICG). The CuS@mSiO2 nanoparticles prepared by a facile one-pot approach can serve as drug-delivery vehicles to transport the NIR absorbing phototherapeutic agent (ICG) within the mesoporous cavities. Meanwhile a phase-change molecule (PCM), TD, is introduced as a thermosensitive gatekeeper to avoid the premature release of loaded ICG...
January 9, 2017: Nanoscale
https://www.readbyqxmd.com/read/28067039/relighting-photosensitizers-by-synergistic-integration-of-albumin-and-perfluorocarbon-for-enhanced-photodynamic-therapy
#14
Hao Ren, Jiaqi Liu, Fenhong Su, Sizhan Ge, Ahu Yuan, Weimin Dai, Jinhui Wu, Yiqiao Hu
Photodynamic therapy (PDT) is hampered by poor water solubility and skin phototoxicity of photosensitizers (PSs). Incorporation of PSs into nanocarrier (Nano-PDT) has been designed to overcome these problems. However, self-quenching of PSs highly condensed in Nano-PDT significantly reduced singlet oxygen (1O2) generation, resulting in unsatisfactory PDT efficacy. Here, we developed a novel tripleffect Nano-PDT, which has a special core-shell nanostructure by synergistic integration of perfluorotributylamine (PFTBA) and human serum albumin (HSA) to improve PDT...
January 9, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28063989/upconversion-nanoparticles-mediated-deep-penetrating-photodynamic-therapy-of-killerred
#15
Liuen Liang, Yiqing Lu, Run Zhang, Andrew Care, Tiago A Ortega, Sergey M Deyev, Yi Qian, Andrei V Zvyagin
: The fluorescent protein KillerRed, a new type of biological photosensitizer, is considered as a promising substitute for current synthetic photosensitizes used in photodynamic therapy (PDT). However, broad applications of this photosensitiser in treating deep-seated lesions is challenging due to the limited tissue penetration of the excitation light with the wavelength falling in the visible spectral range. To overcome this challenge, we employ upconversion nanoparticles (UCNPs) that are able to convert deep-penetrating near infrared (NIR) light to green light to excite KillerRed locally, followed by the generation of reactive oxygen species (ROS) to kill tumour cells under centimetre-thick tissue...
January 4, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28063902/application-of-aluminum-chloride-phthalocyanine-loaded-solid-lipid-nanoparticles-for-photodynamic-inactivation-of-melanoma-cells
#16
Patrícia L Goto, Marigilson P Siqueira-Moura, Antonio C Tedesco
Cutaneous melanoma is the most aggressive skin cancer and is particularly resistant to current therapeutic approaches. Photodynamic therapy (PDT) is a well-established photoprocess that is employed to treat some cancers, including non-melanoma skin cancer. Aluminum chloride phthalocyanine (ClAlPc) is used as a photosensitizer in PDT; however, its high hydrophobicity hampers its photodynamic activity under physiological conditions. The aim of this study was to produce solid lipid nanoparticles (SLN) containing ClAlPc using the direct emulsification method...
January 4, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28063524/switching-from-conventional-photodynamic-therapy-to-daylight-photodynamic-therapy-for-actinic-keratoses-systematic-review-and-meta-analysis
#17
A Tomás-Velázquez, P Redondo
Actinic keratosis is a precursor lesion to the most common nonmelanoma skin cancer. Conventional photodynamic therapy (PDT) has been shown to be effective, but the procedure is time-consuming, can be very painful, and requires infrastructure. These shortcomings led to the emergence of daylight PDT. To obtain a global estimate of efficacy, we undertook a systematic literature review and performed a meta-analysis of the available evidence on the efficacy and safety of daylight PDT as compared to conventional PDT in the treatment of actinic keratosis and/or field cancerization...
January 4, 2017: Actas Dermo-sifiliográficas
https://www.readbyqxmd.com/read/28063407/synthesis-and-in-vitro-photodynamic-therapy-of-chlorin-derivative-13-1-ortho-trifluoromethyl-phenylhydrazone-modified-pyropheophorbide-a
#18
Jianjun Cheng, Wenting Li, Guanghui Tan, Zhiqiang Wang, Shuying Li, Yingxue Jin
Photodynamic therapy (PDT) is entering the mainstream of the cancer treatments recently. Pyropheophorbide-a (Pa), as a degradation product of chlorophyll-a, has been shown to be a potent photosensitizer in photodynamic therapy. In this paper, we investigated the in vitro photodynamic therapy of 13(1)-ortho-trifluoromethyl-phenylhydrazone modified pyropheophorbide-a (PHPa) against human HeLa cervical cancer cell line, together with ultraviolet-visible spectra, fluorescence emission spectra, stability in various solvents, and single oxygen quantum yield...
January 4, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28063300/a-psma-targeted-theranostic-agent-for-photodynamic-therapy
#19
Ying Chen, Samit Chatterjee, Ala Lisok, Il Minn, Mrudula Pullambhatla, Bryan Wharram, Yuchuan Wang, Jiefu Jin, Zaver M Bhujwalla, Sridhar Nimmagadda, Ronnie C Mease, Martin G Pomper
Prostate-specific membrane antigen (PSMA) is over-expressed in the epithelium of prostate cancer and in the neovasculature of many non-prostate solid tumors. PSMA has been increasingly used as a target for cancer imaging and therapy. Here we describe a low-molecular-weight theranostic photosensitizer, YC-9, for PSMA-targeted optical imaging and photodynamic therapy (PDT). YC-9 was synthesized by conjugating IRDye700DX N-hydroxysuccinimide (NHS) ester with a PSMA targeting Lys-Glu urea through a lysine-suberate linker in suitable yield...
December 18, 2016: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28060457/efficacy-dependence-of-photodynamic-therapy-mediated-by-upconversion-nanoparticles-subcellular-positioning-and-irradiation-productivity
#20
Dexin Chen, Ran Tao, Ke Tao, Biqiong Chen, Seok Ki Choi, Qing Tian, Yawen Xu, Guangdong Zhou, Kang Sun
Singlet oxygen ((1) O2 ), as an important kind of reactive oxygen species (ROS) and main therapeutic agent in photodynamic therapy (PDT), only have a half-life of 40 ns and an effective radius of 20 nm, which cause significant obstacles for improving PDT efficacy. In this work, novel upconversion nanoparticle (UCN)-based nanoplatforms are developed with a minimized distance between UCNs and a photosensitizer, protoporphyrin IX (PpIX), and a controllable payload of PpIX, to enhance and control ROS production...
January 6, 2017: Small
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