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https://www.readbyqxmd.com/read/29352409/recent-perspectives-on-the-molecular-basis-of-biofilm-formation-by-pseudomonas-aeruginosa-and-approaches-for-treatment-and-biofilm-dispersal
#1
REVIEW
Sinosh Skariyachan, Vaishnavi Sneha Sridhar, Swathi Packirisamy, Supreetha Toplar Kumargowda, Sneha Basavaraj Challapilli
Pseudomonas aeruginosa, a Gram-negative, rod-shaped bacterium causes widespread diseases in humans. This bacterium is frequently related to nosocomial infections such as pneumonia, urinary tract infections (UTIs) and bacteriaemia especially in immunocompromised patients. The current review focuses on the recent perspectives on biofilms formation by these bacteria. Biofilms are communities of microorganisms in which cells stick to each other and often adhere to a surface. These adherent cells are usually embedded within a self-produced matrix of extracellular polymeric substance (EPS)...
January 19, 2018: Folia Microbiologica
https://www.readbyqxmd.com/read/29351725/daylight-mediated-photodynamic-therapy-with-methyl-aminolevulinate-in-actinic-keratosis-treatment
#2
Shantel D J Demay, Kunal Sharma, Sheetal Sapra, Rahul Sapra, Priya Sapra
BACKGROUND: Research has shown daylight-mediated photodynamic therapy (PDT) for the treatment of actinic keratosis (AK) to be effective, tolerable, and convenient, with excellent patient satisfaction and cosmesis. Although success has been demonstrated in areas with similar latitudes to Switzerland and Scandinavia, this treatment has not been studied in a Canadian population. OBJECTIVES: The purpose of this study is to investigate the effectiveness, safety, and patient satisfaction of daylight-mediated methyl 5-aminolevulinate (MAL)-PDT to make recommendations for its use in Canadian practice...
January 1, 2018: Journal of Cutaneous Medicine and Surgery
https://www.readbyqxmd.com/read/29350426/efficacy-of-photodynamic-therapy-in-the-treatment-of%C3%A2-symptomatic-oral-lichen-planus-a-systematic-review
#3
REVIEW
Sadeq Ali Al-Maweri, Sajna Ashraf, Butchibabu Kalakonda, Esam Halboub, Waleed Petro, Nader Ahmed AlAizari
BACKGROUND: The aim of the present study was to systematically review the efficacy of photodynamic therapy (PDT) in the management of symptomatic oral lichen planus (OLP). MATERIALS AND METHODS: PubMed/MEDLINE, Scopus, and ISI Web of knowledge were searched until July 2017, using the following keywords: oral lichen planus, erosive lichen planus, lichen planus, and photodynamic therapy. RESULTS: Five clinical studies were included. The risk of bias was considered high in four studies and moderate in one study...
January 19, 2018: Journal of Oral Pathology & Medicine
https://www.readbyqxmd.com/read/29348806/therapeutic-nanosystem-consisting-of-singlet-oxygen-responsive-prodrug-and-photosensitizer-excited-by-two-photon-light
#4
Yi Lin, Xiao-Fang Jiang, Xiangyan Duan, Fang Zeng, Bo Wu, Shuizhu Wu
Using light as the sole stimulus and employing the generated singlet oxygen as a therapeutic agent and the trigger to activate chemo-drug release could serve as an elegant way to bring into full play the advantageous features of light and enhance therapeutic efficacy through a combination of chemotherapy and photodynamic therapy. Herein a liposomal drug system has been developed by embedding a fluorescent photosensitizer and a prodrug into phospholipid vesicles. Upon one- or two-photon light irradiation, the photosensitizer generates singlet oxygen, which removes the protecting group of the prodrug and subsequently causes the release of the active drug chlorambucil...
January 11, 2018: ACS Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/29346736/light-activatable-red-blood-cell-membrane-camouflaged-dimeric-prodrug-nanoparticles-for-synergistic-photodynamic-chemotherapy
#5
Qing Pei, Xiuli Hu, Xiaohua Zheng, Shi Liu, Yawei Li, Xiabin Jing, Zhigang Xie
Biomimetic approach offers numerous opportunities to design therapeutic platforms with enhanced antitumor performance and biocompatibility. Herein we report a novel red blood cell membrane-camouflaged nanoparticle (RBC(M(TPC-PTX))) for synergistic chemo- and photodynamic therapy (PDT). Specifically, the inner core is mainly constructed by reactive oxygen species (ROS)-responsive PTX dimer (PTX2-TK) and photosensitizer 5,10,15,20-tetraphenylchlorin (TPC). In vitro experiments show that the prepared RBC(M(TPC-PTX)) is readily taken up into endosomes...
January 18, 2018: ACS Nano
https://www.readbyqxmd.com/read/29346241/chronic-central-serous-chorioretinopathy-early-and-late-morphological-and-functional-changes-after-verteporfin-photodynamic-therapy
#6
Pierluigi Iacono, Massimiliano Tedeschi, Barbara Boccassini, Adele Chiaravalloti, Monica Varano, Mariacristina Parravano
PURPOSE: To describe early and late morphological and functional changes in subjects receiving photodynamic therapy (PDT) for chronic central serous chorioretinopathy. METHODS: Patients with chronic central serous chorioretinopathy were prospectively enrolled and received standard PDT. At the baseline examination, each subject underwent complete ophthalmological examination, including best-corrected visual acuity (BCVA) assessment, fluorescein angiography and indocyanine green angiography, spectral domain optical coherence tomography, and microperimetry...
January 16, 2018: Retina
https://www.readbyqxmd.com/read/29345749/self-production-of-oxygen-system-cao2-mno2-pda-mb-for-the-photodynamic-therapy-research-and-switch-control-tumor-cell-imaging
#7
Chenhui Ji, Zhongzhong Lu, Yonghui Xu, Beibei Shen, Shiyong Yu, Dan Shi
Photodynamic therapy (PDT) holds promise in biochemical study and tumor treatment. A novel multifunctional nanosystem CaO2 /MnO2 @polydopamine (PDA)-methylene blue (MB) nanosheet (CMP-MB) was designed. CaO2 nanoparticles were encapsulated by MnO2 nanosheet, and then PDA was coated on the surface of CaO2 /MnO2 nanosheets, which could adsorb photosensitizer MB through hydrophobic interaction or π-π stacking. In this nanosystem, CaO2 /MnO2 had the ability of self-production of oxygen, which solved the problem of tumor hypoxia largely...
January 18, 2018: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/29345434/two-photon-excited-silica-and-organosilica-nanoparticles-for-spatiotemporal-cancer-treatment
#8
REVIEW
Jonas G Croissant, Jeffrey I Zink, Laurence Raehm, Jean-Olivier Durand
Coherent two-photon-excited (TPE) therapy in the near-infrared (NIR) provides safer cancer treatments than current therapies lacking spatial and temporal selectivities because it is characterized by a 3D spatial resolution of 1 µm3 and very low scattering. In this review, the principle of TPE and its significance in combination with organosilica nanoparticles (NPs) are introduced and then studies involving the design of pioneering TPE-NIR organosilica nanomaterials are discussed for bioimaging, drug delivery, and photodynamic therapy...
January 18, 2018: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/29344634/underlying-mechanism-of-the-photodynamic-activity-of-hematoporphyrin%C3%A2-induced-apoptosis-in-u87-glioma-cells
#9
Shi-Xiang Yuan, Jun-Liang Li, Xin-Ke Xu, Wei Chen, Cheng Chen, Kun-Qi Kuang, Fang-Yu Wang, Kai Wang, Fang-Cheng Li
Photodynamic therapy (PDT) is a relatively novel type of tumor therapy method with low toxicity and limited side‑effects. The aim of the present study was to investigate the underlying mechanism and potential microRNAs (miRNAs) involved in the treatment of glioma by PDT with hematoporphyrin, a clinical photosensitizer. The photodynamic activity of hematoporphyrin on the cell viability and apoptosis of gliomas was investigated by MTT, and flow cytometry and fluorescence microscopy, respectively. Alterations in singlet oxygen and mitochondrial membrane potential were detected...
January 18, 2018: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/29344301/wst11-vascular-targeted-photodynamic-therapy-effect-monitoring-by-multispectral-optoacoustic-tomography-msot-in-mice
#10
Volker Neuschmelting, Kwanghee Kim, Jaber Malekzadeh-Najafabadi, Sylvia Jebiwott, Jaya Prakash, Avigdor Scherz, Jonathan A Coleman, Moritz F Kircher, Vasilis Ntziachristos
Objective: Monitoring emerging vascular-targeted photodynamic therapy (VTP) and understanding the time-dynamics of treatment effects remains challenging. We interrogated whether handheld multispectral optoacoustic tomography (MSOT) could noninvasively monitor the effect of VTP using WST11, a vascular-acting photosensitizer, on tumor tissues over time using a renal cell cancer mouse model. We also investigated whether MSOT illumination can induce VTP, to implement a single-modality theranostic approach. Materials and Methods: Eight BalB/c mice were subcutaneously implanted with murine renal adenocarcinoma cells (RENCA) on the flank...
2018: Theranostics
https://www.readbyqxmd.com/read/29344278/potent-peptide-conjugated-silicon-phthalocyanines-for-tumor-photodynamic-therapy
#11
Qian Liu, Mingpei Pang, Sihai Tan, Jin Wang, Qingle Chen, Kai Wang, Wenjie Wu, Zhangyong Hong
Phthalocyanines (Pcs) are a group of promising photosensitizers for use in photodynamic therapy (PDT). However, their extremely low solubility and their strong tendency to aggregate in aqueous solution greatly restrict their application. Conjugation of Pc macrocycles with peptide ligands could be a very useful strategy to optimize the physical properties of Pcs not only by increasing their water solubility and reducing their aggregation but also by endowing the conjugates with a tumor-targeting capability. To develop highly potent photosensitizers for tumor PDT, we prepared new peptide-conjugated photosensitizers using silicon Pc (SiPc), which has much higher photodynamic activity than zinc Pcs, as the light activation moiety and the cRGDfK peptide (or simply cRGD) as the peptide moiety...
2018: Journal of Cancer
https://www.readbyqxmd.com/read/29338907/new-photodynamic-molecular-beacons-pmb-as-potential-cancer-targeted-agents-in-pdt
#12
Aurélie Stallivieri, Ludovic Colombeau, Jérôme Devy, Nicolas Etique, Carine Chaintreuil, Bauyrzhan Myrzakhmetov, Mathilde Achard, Francis Baros, Philippe Arnoux, Régis Vanderesse, Céline Frochot
Further improvements in Photodynamic therapy (PDT) necessitate that the dye targets more selectively tumour tissues or neovascularization than healthy cells. Different enzymes such as matrix metalloproteinases (MMPs) are overexpressed in tumour areas. Among these MMPs, gelatinases (MMP-2 and MMP-9) and its activator MMP-14 are known to play a key role in tumour angiogenesis and the growth of many cancers such as glioblastoma multiforme (GBM), an aggressive malignant tumour of the brain. These last years, the concept of photodynamic molecular beacons (PMB) became interesting for controlling the photosensitizer's ability to generate singlet oxygen (1O2) close to target biomolecules as MMPs...
December 24, 2017: Bioorganic & Medicinal Chemistry
https://www.readbyqxmd.com/read/29334090/supramolecular-photosensitizers-rejuvenate-photodynamic-therapy
#13
Xingshu Li, Songyi Lee, Juyoung Yoon
Owing to its spatiotemporal selectivity and noninvasive nature, photodynamic therapy (PDT) has become a clinically promising approach for the treatment of a wide range of cancers and other diseases. However, the full potential of PDT has not been achieved thus far as a consequence of the lack of optimal photosensitizers (PSs) and/or smart transport/activation strategies. These problems, which unfortunately lie at the core of the PDT paradigm, include the oxygen reliance limits, the effect of PDT on hypoxic tumors, limitations of light penetration, and undesired skin photosensitization induced by "always on" PSs...
January 15, 2018: Chemical Society Reviews
https://www.readbyqxmd.com/read/29333608/the-synergistic-effect-of-pdt-and-oxacillin-on-clinical-isolates-of-staphylococcus-aureus
#14
Natanel Iluz, Yasmin Maor, Natan Keller, Zvi Malik
BACKGROUND: Staphylococcus aureus is a major pathogen in clinical microbiology. It is known to cause infections at various body sites and can be life-threatening. The development of resistance to many well-established antibiotic treatments and the prevalence of methicillin-resistant S. aureus (MRAS) among hospital patients and the general community pose challenges in treating the pathogen. The antimicrobial effect of photodynamic therapy (PDT) has been a subject of study for a long time and can offer new strategies for dealing with resistant strains...
January 15, 2018: Lasers in Surgery and Medicine
https://www.readbyqxmd.com/read/29331661/effect-of-laf3-ag-fluorescent-nanoparticles-on-photodynamic-efficiency-and-cytotoxicity-of-protoporphyrin-ix-photosensitizer
#15
F Tavakkoli, M Zahedifar, E Sadeghi
LaF3: Ag nanoparticles (NPs) were synthesized by the co-precipitation method. The produced NPs were characterized by X-ray diffraction (XRD) pattern, scanning electron microscope (SEM), dynamic light scattering (DLS) and Fourier transform infrared spectroscopy (FTIR). The emission spectrum of LaF3:Ag NPs is mostly overlapped with the absorption band of protoporphyrin IX (PpIX) and their conjugation was confirmed by studying fluorescence resonance energy transfer (FRET) from LaF3:Ag donor to protoporphyrin IX acceptor...
January 10, 2018: Photodiagnosis and Photodynamic Therapy
https://www.readbyqxmd.com/read/29331658/sulforaphene-enhances-the-efficacy-of-photodynamic-therapy-in-anaplastic-thyroid-cancer-through-ras-raf-mek-erk-pathway-suppression
#16
Saswata Chatterjee, Yunhee Rhee, Phil-Sang Chung, Rui-Feng Ge, Jin-Chul Ahn
Sulforaphene (SFE), a natural isothiocyanate from cruciferous vegetables has shown a potential anticancer effect against cervical and lung cancer. Palliative treatments like photodynamic therapy (PDT) are being implemented for a long time however, the results are still not promising in case of aggressive cancers like anaplastic thyroid cancer. The objective of this work is to establish an alternative method with the combination of photofrin-PDT and sulforaphene, a natural isothiocyanate from cruciferous vegetables, against human anaplastic thyroid cancer to enhance the efficacy of PDT...
December 11, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/29331556/polypoidal-choroidal-vasculopathy-definition-pathogenesis-diagnosis-and-management
#17
REVIEW
Chui Ming Gemmy Cheung, Timothy Y Y Lai, Paisan Ruamviboonsuk, Shih-Jen Chen, Youxin Chen, K Bailey Freund, Fomi Gomi, Adrian H Koh, Won-Ki Lee, Tien Yin Wong
Polypoidal choroidal vasculopathy (PCV) is an age-related macular degeneration (AMD) subtype and is seen particularly in Asians. Previous studies have suggested disparity in response to intravitreal injections of anti-vascular endothelial growth factor (VEGF) agents between PCV and typical AMD, and thus, the preferred treatment for PCV has remained unclear. Recent research has provided novel insights into the pathogenesis of PCV, and imaging studies based on OCT suggest that PCV belongs to a spectrum of conditions characterized by pachychoroid, in which disturbance in the choroidal circulation seems to be central to its pathogenesis...
January 10, 2018: Ophthalmology
https://www.readbyqxmd.com/read/29327259/5-aminolevulinic-acid-squalene-nanoassemblies-for-tumor-photodetection-and-therapy-in-vitro-studies
#18
Andrej Babič, V Herceg, E Bastien, H-P Lassalle, L Bezdetnaya, Norbert Lange
Protoporphyrin IX (PpIX) as natural photosensitizer derived from administration of 5-aminolevulinic acid (5-ALA) has found clinical use for photodiagnosis and photodynamic therapy of several cancers. However, broader use of 5-ALA in oncology is hampered by its charge and polarity that result in its reduced capacity for passing biological barriers and reaching the tumor tissue. Advanced drug delivery platforms are needed to improve the biodistribution of 5-ALA. Here, we report a new approach for the delivery of 5-ALA...
January 11, 2018: Nanoscale Research Letters
https://www.readbyqxmd.com/read/29324346/synthesis-and-biological-characterization-of-novel-rose-bengal-derivatives-with-improved-amphiphilicity-for-sono-photodynamic-therapy
#19
Hai-Jun Chen, Xiao-Bin Zhou, Ai-Lan Wang, Bi-Yuan Zheng, Chih-Kuang Yeh, Jian-Dong Huang
Sono-Photodynamic therapy (SPDT) utilizing ultrasound and light has been demonstrated that this novel approach can lower dosage resulting in reduction of the potential side effects caused by sensitizers. Recently, a new formulation of rose bengal (RB) as an intralesional injection has completed clinical trials phase II for PDT treatment of melanoma cancer. However, the inherent unfavorable pharmacological properties of RB hindered its extensive clinical development. With the aim to identify new RB derivatives (RBDs) with enhanced photodynamic and sonodynamic anticancer efficiency, a series of amphiphilic RBDs have been designed, synthesized and biological characterized...
January 2, 2018: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29323875/theranostics-of-triple-negative-breast-cancer-based-on-conjugated-polymer-nanoparticles
#20
Guorui Jin, Rongyan He, Qian Liu, Yuqing Dong, Min Lin, Wenfang Li, Feng Xu
Triple negative breast cancer (TNBC) does not respond to many targeted drugs due to the lack of three receptors (i.e., estrogen receptor, progesterone receptor and human epidermal growth factor receptor-2), which makes it difficult for TNBC detection and treatment. As compared to traditional breast cancer treatments such as surgery and chemotherapy, photodynamic therapy (PDT) has emerged as a promising approach for treating TNBC due to its precise controllability, high spatiotemporal accuracy and minimal invasive nature...
January 11, 2018: ACS Applied Materials & Interfaces
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