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https://www.readbyqxmd.com/read/29778525/mucus-penetrating-nanoparticles-promising-drug-delivery-systems-for-the-photodynamic-therapy-of-intestinal-cancer
#1
Juliane Anderski, Laura Mahlert, Dennis Mulac, Klaus Langer
Photodynamic therapy (PDT) is an auspicious therapy approach for the treatment of cancer. Despite its numerous benefits, the drug delivery of the used photosensitizer (PS) to target locations inside the human body remains a main therapy challenge, since the standard intravenous PS injection often causes systemic side-effects. To circumvent this therapy drawback, the oral application represents a promising administration alternative. Especially for the treatment of intestinal cancer it offers the possibility of a local treatment with a reduced likelihood for adverse drug reactions...
May 17, 2018: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/29777987/phthalocyanine-sulfonamide-conjugates-synthesis-and-photodynamic-inactivation-of-gram-negative-and-gram-positive-bacteria
#2
Raquel Nunes da Silva, Ângela Cunha, Augusto C Tomé
Phthalocyanines bearing four or eight sulfonamide units were synthesized and their efficiency in the photodynamic inactivation of Gram-negative (Escherichia coli) and Gram-positive (Staphylococcus aureus) bacteria was evaluated. Conjugates with simpler sulfonamide units (N,N-diethylbenzenesulfonamide, N-isopropylbenzenesulfonamide and N-(4-methoxyphenyl)benzenesulfonamide) caused stronger inactivation than those with heterocyclic groups (N-(thiazol-2-yl)benzenesulfonamide) or long alkyl chains (N-dodecylbenzenesulfonamide) in both bacteria...
May 9, 2018: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29775760/synthesis-of-axially-disubstituted-silicon-phthalocyanines-and-investigation-of-photodynamic-effects-on-hct-116-colorectal-cancer-cell-line
#3
Ceren Sarı, Figen Celep Eyüpoğlu, İsmail Değirmencioğlu, Rıza Bayrak
Photodynamic therapy is one of the hot topics in cancer studies recently. Basically, photosensitizing chemical substrates which are stimulated by light having a specific wavelength cause fatal effect on different kind of cells in photodynamic therapy. In this study, axially 4-{[(1E)-2-furylmethylene]amino}phenol, 4-{[(1E)-2-thienylmethylene]amino}phenol and 4-{[(1E)-(4-nitro-2-thienyl)methylene]amino}phenol disubstituted silicon phthalocyanines were synthesized as Photosensitizers for photodynamic therapy in cancer treatment for the first time...
May 15, 2018: Photodiagnosis and Photodynamic Therapy
https://www.readbyqxmd.com/read/29775503/artificial-rod-and-cone-photoreceptors-with-human-like-spectral-sensitivities
#4
Byeongho Park, Heehong Yang, Tai Hwan Ha, Hyun Seo Park, Seung Ja Oh, Yong-Sang Ryu, Youngho Cho, Hyo-Suk Kim, Juyeong Oh, Dong Kyu Lee, Chulki Kim, Taikjin Lee, Minah Seo, Jaebin Choi, Young Min Jhon, Deok Ha Woo, Seok Lee, Seok Hwan Kim, Hyuk-Jae Lee, Seong Chan Jun, Hyun Seok Song, Tai Hyun Park, Jae Hun Kim
Photosensitive materials contain biologically engineered elements and are constructed using delicate techniques, with special attention devoted to efficiency, stability, and biocompatibility. However, to date, no photosensitive material has been developed to replace damaged visual-systems to detect light and transmit the signal to a neuron in the human body. In the current study, artificial nanovesicle-based photosensitive materials are observed to possess the characteristics of photoreceptors similar to the human eye...
May 18, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29774871/-progression-of-basic-research-clinical-application-of-photodynamic-therapy-and-fluorescence-guided-surgery-in-glioma-treatment
#5
Xuegang Li, Hua Feng, Fei Li
The prognosis of glioma remains poor because of the infiltrative nature and the high local relapse rate. The current goals for patients with gliomas is maximal safe resection and adjuvant therapy. Tumor-specific photosensitizer, such as hematoporphyrin derivative (HpD) 5-aminolevulinic acid (5-ALA), can be selective up-taken and accumulated in tumor tissue. Light with appropriate wavelength can penetrate tumor tissue and excite the photosensitizer. The excited photosensitizer within glioma cells permits fluorescence visualization of tumor tissue during surgery and has been introduced in treatment of glioma as fluorescence-guided surgery (FGS)...
April 28, 2018: Zhong Nan da Xue Xue Bao. Yi Xue Ban, Journal of Central South University. Medical Sciences
https://www.readbyqxmd.com/read/29773814/melanopsin-mediated-pupil-function-is-impaired-in-parkinson-s-disease
#6
Daniel S Joyce, Beatrix Feigl, Graham Kerr, Luisa Roeder, Andrew J Zele
Parkinson's disease (PD) is characterised by non-motor symptoms including sleep and circadian disruption. Melanopsin-expressing intrinsically photosensitive Retinal Ganglion Cells (ipRGC) transmit light signals to brain areas controlling circadian rhythms and the pupil light reflex. To determine if non-motor symptoms observed in PD are linked to ipRGC dysfunction, we evaluated melanopsin and rod/cone contributions to the pupil response in medicated participants with PD (n = 17) and controls (n = 12)...
May 17, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29771775/photodynamic-therapy-for-bronchial-microscopic-residual-disease-after-resection-in-lung-cancer
#7
Hiren J Mehta, Abhishek Biswas, Sebastian Fernandez-Bussy, Mauricio Pipkin, Tiago Machuca, Michael A Jantz
BACKGROUND: The goal of lung cancer surgery is a complete tumor resection (R0 resection) with clear margins. 4% to 5% of resections have microscopic residual disease associated with worse prognosis. Definitive management is resection of residual tumor, which may not be tolerated by many patients, and definitive management is not well studied in these patients. We treated patients with stage I cancer and bronchial mucosal residual disease (MRD) with bronchoscopic photodynamic therapy (PDT)...
May 16, 2018: Journal of Bronchology & Interventional Pulmonology
https://www.readbyqxmd.com/read/29771193/early-symptoms-of-systemic-lupus-erythematosus-sle-recalled-by-339-sle-patients
#8
N Leuchten, B Milke, B Winkler-Rohlfing, D Daikh, T Dörner, S R Johnson, M Aringer
Objective The European League Against Rheumatism and the American College of Rheumatology jointly embarked on a new classification criteria for systemic lupus erythematosus (SLE) project. Its first phase involved generation of a broad set of items potentially useful for classification of SLE. This study was undertaken to add the patient perspective to an expert Delphi approach and an early patient cohort study. Methods A national cross-sectional study was conducted. A self-report questionnaire was published in the "Schmetterling" (Butterfly), the quarterly journal of the German SLE patient association...
January 1, 2018: Lupus
https://www.readbyqxmd.com/read/29768838/mesoporous-cds-via-network-of-self-assembled-nanocrystals-synthesis-characterization-and-enhanced-photoconducting-property
#9
Astam K Patra, Biplab Banerjee, Asim Bhaumik
Semiconduction nanoparticles are intensively studied due to their huge potential in optoelctronic applications. Here we report an efficient chemical route for hydrothermal synthesis of aggregated mesoporous cadmium sulfide (CdS) nanoparticles using supramolecular-assembly of ionic and water soluble sodium salicylate as the capping agent. The nanostructure, mesophase, optical property and photoconductivity of these mesoporous CdS materials have been characterized by using small and wide angle powder X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), N2-sorption, Raman analysis, Fourier transformed infrared (FT-IR), UV-Visible DSR spectroscopy, and photoconductivity measurement...
January 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29767974/in-vitro-and-in-vivo-demonstration-of-human-ovarian-cancer-necrosis-through-a-water-soluble-and-near-infrared-absorbing-chlorin
#10
Betsy Marydasan, Bollapalli Madhuri, Shirisha Cherukommu, Jedy Jose, Mambattakkara Viji, Suneesh C Karunakaran, Tavarekere K Chandrashekar, Kunchala Sridhar Rao, Ch Mohan Rao, Danaboyina Ramaiah
With an objective to develop efficient sensitizers for therapeutical applications, we synthesized a water soluble, 5,10,15,20-tetrakis(3,4-dihydroxyphenyl)chlorin (TDC), and investigated its in vitro and in vivo biological efficacy and compared with the commercially available sensitizers. TDC showed high water solubility (6-fold), when compared to Foscan and exhibited excellent triplet excited state () and singlet oxygen () yields. In vitro photobiological investigations in human ovarian cancer cell lines SKOV-3 showed high photocytotoxicity, negligible dark toxicity, rapid cellular uptake and specific localization of TDC in neoplastic cells as assessed by flow cytometric cell-cycle and propidium iodide staining analysis...
May 16, 2018: Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29767476/enhancing-hydrogen-generation-through-nanoconfinement-of-sensitizers-and-catalysts-in-a-homogeneous-supramolecular-organic-framework
#11
Shang-Bo Yu, Qi Qi, Bo Yang, Hui Wang, Dan-Wei Zhang, Yi Liu, Zhan-Ting Li
Enrichment of molecular photosensitizers and catalysts in a confined nanospace is conducive for photocatalytic reactions due to improved photoexcited electron transfer from photosensitizers to catalysts. Herein, the self-assembly of a highly stable 3D supramolecular organic framework from a rigid bipyridine-derived tetrahedral monomer and cucurbit[8]uril in water, and its efficient and simultaneous intake of both [Ru(bpy)3 ]2+ -based photosensitizers and various polyoxometalates, that can take place at very low loading, are reported...
May 16, 2018: Small
https://www.readbyqxmd.com/read/29767317/successful-sequential-treatment-with-itraconazole-and-ala-pdt-for-cutaneous-granuloma-by-candida-albicans-a-case-report-and-literature-review
#12
Qing Cai, Lian-Juan Yang, Jia Chen, Hong Yang, Zhi-Qin Gao, Xiu-Li Wang
Photodynamic therapy (PDT) is a process that combines a photosensitizing drug and light and promotes phototoxic responses in target cells, mainly via oxidative damage. Antifungal photodynamic therapy has been successfully employed against Candida species, dermatophytes, and deep mycoses. We present a case of a cutaneous granuloma caused by C. albicans treated with 5-aminolevulinic acid (ALA)-PDT. A 64-year-old man presented with two plaques on his right hand and wrist for 2 years. The diagnosis was made based on histopathology, mycology, and molecular identification of paraffin-embedded tissues...
May 16, 2018: Mycopathologia
https://www.readbyqxmd.com/read/29766717/photocatalytic-oxidation-of-sulfur-mustard-and-its-simulant-on-bodipy-incorporated-polymer-coatings-and-fabrics
#13
Hui Wang, George W Wagner, Annie Xi Lu, Dominique L Nguyen, James H Buchanan, Patrick M McNutt, Christopher J Karwacki
Sulfur mustard is one of the most toxic chemical warfare agents worldwide. We report the use of 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY) photosensitizers as a fast and effective sulfur mustard decontaminant and their incorporation into various polymer coatings and fabrics, including army combat uniform. These BODIPY-embedded materials are capable of generating singlet oxygen under visible light irradiation and effectively detoxifying sulfur mustard by converting it into non-toxic sulfoxides as the major products...
May 16, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29764120/multi-arm-nanoconjugates-for-cancer-cell-targeted-delivery-of-photosensitizers
#14
Yan Zhao, Fang Li, Chengqiong Mao, Xin Ming
Photodynamic therapy, a procedure that uses a photosensitizer to enable light therapy selectively at diseased sites, remains underutilized in oncological clinic. To further improve its cancer selectivity, we developed a polymeric nanosystem by conjugating a photosensitizer IRDye 700DX (IR700) and cancer targeting RGD peptide to 8-arm polyethylene glycol (PEG). The resulting nanoconjugates (RGD-8PEG-IR700) exhibited a hydrodynamic size of 6.6 nm with narrow distribution of size. The targeted nanoconjugates showed significantly higher intracellular uptake of IR700 in integrin αvβ3-expressing A375 and SKOV3 cells when compared with non-targeted control 8PEG-IR700, and excess amount of RGD peptides could abolish this enhancement, indicating a receptor-medicated uptake mechanism for the targeted polymer conjugates...
May 16, 2018: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/29763739/antimicrobial-effect-of-the-photodynamic-therapy-using-erythrosine-methylene-blue-combination-on-streptococcus-mutans-biofilm
#15
Laíse Midori Tokubo, Pedro Luiz Rosalen, Janaina de Cássia Orlandi Sardi, Irlan Almeida Freires, Mitsue Fujimaki, Josely Emiko Umeda, Patricia Magalhães Barbosa, Gabriela Ortolan Tecchio, Noboru Hioka, Camila Fabiano de Freitas, Raquel Sano Suga Terada
BACKGROUND: Photodynamic therapy (PDT) has demonstrated promising results in the treatment of several clinical pathologies through the photochemical reaction caused by the combination of a photosensitizer and a light source. The objective of this study was to evaluate the antimicrobial effect of the combination of the photosensitizers (PSs) erythrosine/methylene blue activated by a white halogen light device on Streptococcus mutans biofilm. METHODS: Two separate experiments were conducted, the first using the PSs at the concentration of 100 μM, and the second 250 μM...
May 12, 2018: Photodiagnosis and Photodynamic Therapy
https://www.readbyqxmd.com/read/29763715/near-infrared-light-activated-red-emitting-upconverting-nanoplatform-for-t-1-weighted-magnetic-resonance-imaging-and-photodynamic-therapy
#16
Xiang-Long Tang, Jun Wu, Ben-Lan Lin, Sheng Cui, Hong-Mei Liu, Ru-Tong Yu, Xiao-Dong Shen, Ting-Wei Wang, Wei Xia
Photodynamic therapy (PDT) has increasingly become an efficient and attractive cancer treatment modality based on reactive oxygen species (ROS) that can induce tumor death after irradiation with ultraviolet or visible light. Herein, to overcome the limited tissue penetration in traditional PDT, a novel near-infrared (NIR) light-activated NaScF4 : 40% Yb, 2% Er@CaF2 upconversion nanoparticle (rUCNP) is successfully designed and synthesized. Chlorin e6, a photosensitizer and a chelating agent for Mn2+ , is loaded into human serum albumin (HSA) that further conjugates onto rUCNPs...
May 12, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29763568/near-infrared-activatable-phthalocyanine-poly-l-glutamic-acid-conjugate-enhanced-in-vivo-safety-and-antitumor-efficacy-towards-an-effective-photodynamic-cancer-therapy
#17
Hoay Yan Cheah, Elena Gallon, Fabienne Dumoulin, See Ziau Hoe, Nina Japundžić-Žigon, Sofija Glumac, Hong Boon Lee, Prem Anand, Lip Yong Chung, Maria Jesus Vicent, Lik Voon Kiew
We previously developed a new zinc (II) phthalocyanine (ZnPc) derivative (Pc 1) conjugated to poly-L-glutamic acid (PGA) (1-PG) to address the limitations of ZnPc as part of an antitumor photodynamic therapy approach, which include hydrophobicity, phototoxicity and non-selectivity in biodistribution and tumor targeting. During this study, we discovered that 1-PG possessed high near infrared (NIR) light absorptivity (λmax = 675 nm), good singlet oxygen generation efficiency in an aqueous environment, and enhanced photocytotoxic efficacy and cancer cell uptake in vitro...
May 15, 2018: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/29763297/nitrobenzoxadiazole-appended-cell-membrane-modifiers-for-efficient-optoporation-with-non-coherent-light
#18
Saya Otake, Kou Okuro, Davide Bochicchio, Giovanni M Pavan, Takuzo Aida
FL NBD-BAMPEG2k bearing a nitrobenzoxadiazole (NBD) unit and an oleyl terminus conjugated via a poly(ethylene glycol) (PEG) spacer ( Mn = 2,000), was designed to fluorescently label cell membranes by docking its hydrophobic oleyl terminus. During laser scanning microscopy in a minimal essential medium (MEM), human hepatocellular carcinoma Hep3B cells labelled with FL NBD-BAMPEG2k appeared to undergo optoporation at their plasma membrane. We confirmed this unprecedented possibility by a series of cellular uptake experiments using negatively charged and therefore membrane-impermeable quantum dots (QDs; Dh = 4...
May 15, 2018: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/29762011/strategies-toward-organic-carbon-monoxide-prodrugs
#19
Xingyue Ji, Binghe Wang
Carbon monoxide is widely acknowledged as an important gasotransmitter in the mammalian system with importance on par with that of nitric oxide. It has also been firmly established as a potential therapeutic agent with a wide range of indications including organ transplantation, cancer, bacterial infection, and inflammation-related conditions such as colitis and sepsis. One major issue in developing CO based therapeutics is its delivery in a pharmaceutically acceptable form. Currently, there are generally five forms of deliveries: inhaled CO, photosensitive CO-releasing molecules, encapsulated CO, CO dissolved in drinks, and molecules that would release CO under physiological conditions without the need for light...
May 15, 2018: Accounts of Chemical Research
https://www.readbyqxmd.com/read/29761787/osteoinducing-scaffolds-with-multi-layered-biointerface
#20
Ekaterina A Grebenik, Varvara Grinchenko, Semyon Nikolaevich Churbanov, Nikita Minaev, Boris Shavkuta, Pavel Alexandrovich Melnikov, Denis Butnaru, Yury Rochev, Victor Nikolayevich Bagratashvili, Peter S Timashev
This study was aimed to design and characterize hybrid tissue-engineered constructs composed of osteoinducing polylactide-based scaffolds with multi-layered cellular biointerface for bone tissue reconstruction. Three-dimensional scaffolds with improved hydrophilic and osteoinducing properties were produced using the surface-selective laser sintering (SSLS) method. The designed scaffold pattern had dimensions of 8×8×2.5 mm and ladder-like pores (~ 700 μm in width). Hyaluronic acid-coated polylactide microparticles (~ 100 μm in diameter) were used as building blocks and water was used as the photosensitizer for SSLS followed by photocross-linking with Irgacure 2959 photoinitiator...
May 15, 2018: Biomedical Materials
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