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https://www.readbyqxmd.com/read/28893957/anti-inflammatory-role-of-langerhans-cells-and-apoptotic-keratinocytes-in-ultraviolet-b-induced-cutaneous-inflammation
#1
Mayumi Hatakeyama, Atsushi Fukunaga, Ken Washio, Kumiko Taguchi, Yoshiko Oda, Kanako Ogura, Chikako Nishigori
UV radiation, particularly UVB, is the major risk factor for the induction of skin cancer, and it induces skin inflammation and immunosuppression. Although reports documented that Langerhans cells (LCs) play various roles in photobiology, little is known about whether they contribute to UVB-induced cutaneous inflammation. Recently, the anti-inflammatory effect of apoptotic cells was noted. This study focuses on the roles of LCs and apoptotic cells in UVB-induced cutaneous inflammation. We show that LCs are essential for resolution of UVB-induced cutaneous inflammation...
September 11, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28868533/pet-based-bisbodipy-photosensitizers-for-highly-efficient-excited-triplet-state-and-singlet-oxygen-generation-tuning-photosensitizing-ability-by-dihedral-angles
#2
Xian-Fu Zhang, Xudong Yang, Baomin Xu
Herein, four covalent BODIPY heterodimers that differ by dihedral angles were shown to be highly efficient excited triplet state (T1) photosensitizers (PSs) for singlet oxygen formation with a quantum yield (ΦΔ) of up to 0.94 as compared to their respective monomers, which had only negligible ΦΔ of ca. 0.060. More interestingly, these PSs generate T1via charge recombination mechanism rather than traditional inter-system crossing. The photosensitizing ability of dimers is easily tuned by either the dihedral angle (between the two linked BODIPYs) or solvent polarity...
September 4, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28831916/discovery-and-development-of-natural-products-and-their-derivatives-as-photosensitizers-for-photodynamic-therapy
#3
Qicai Xiao, Juan Wu, Xin Pang, Yue Jiang, Pan Wang, Albert Wingnang Leung, Liqian Gao, Sheng Jiang, Chuanshan Xu
Photodynamic therapy (PDT) has been developed as an alternative modality for the management of neoplastic and nonneoplastic diseases. It is a minimally invasive treatment that involves the interaction of a non-toxic photosensitizer (PS), light and molecular oxygen to generate reactive oxygen species (ROS), resulting in the destruction of unwanted cells and tissues. Discovery and development of new PSs with optimized properties are much crucial for achieving a desirable therapeutic efficacy. This review describes the photochemical and photobiological mechanisms of PDT, and outlines the recent progress in discovery and development of natural products and their derivatives as phototherapeutic drugs...
August 23, 2017: Current Medicinal Chemistry
https://www.readbyqxmd.com/read/28774676/microalgal-hydrogen-production-a-review
#4
REVIEW
Wanthanee Khetkorn, Rajesh P Rastogi, Aran Incharoensakdi, Peter Lindblad, Datta Madamwar, Ashok Pandey, Christian Larroche
Bio-hydrogen from microalgae including cyanobacteria has attracted commercial awareness due to its potential as an alternative, reliable and renewable energy source. Photosynthetic hydrogen production from microalgae can be interesting and promising options for clean energy. Advances in hydrogen-fuel-cell technology may attest an eco-friendly way of biofuel production, since, the use of H2 to generate electricity releases only water as a by-product. Progress in genetic/metabolic engineering may significantly enhance the photobiological hydrogen production from microalgae...
July 17, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28752826/realization-of-wide-circadian-variability-by-quantum-dots-luminescent-mesoporous-silica-based-white-light-emitting-diodes
#5
Xiaobing Luo, Bin Xie, Jingjing Zhang, Wei Chen, Junjie Hao, Yanhua Cheng, Run Hu, Dan Wu, Kai Wang
Human comfortability has become one of the important criteria in the modern lighting architecture. Here, we proposed a tuning strategy to enhance the non-image forming photobiological effect on the human circadian rhythm based on the quantum dots-converted white light emitting diodes (QDs-WLEDs). We introduced the limiting variability of the circadian action factor (CAF), defined as the ratio of circadian efficiency and luminous efficiency of radiation. The CAF was deeply discussed and was found to be a function of constraining color rendering index (CRI) and correlated color temperatures (CCT)...
July 28, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28744290/photoreceptor-mediated-plant-growth-responses-implications-for-photoreceptor-engineering-toward-improved-performance-in-crops
#6
REVIEW
Ophilia I L Mawphlang, Eros V Kharshiing
Rising temperatures during growing seasons coupled with altered precipitation rates presents a challenging task of improving crop productivity for overcoming such altered weather patterns and cater to a growing population. Light is a critical environmental factor that exerts a powerful influence on plant growth and development ranging from seed germination to flowering and fruiting. Higher plants utilize a suite of complex photoreceptor proteins to perceive surrounding red/far-red (phytochromes), blue/UV-A (cryptochromes, phototropins, ZTL/FKF1/LKP2), and UV-B light (UVR8)...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28720547/novel-water-soluble-morpholine-substituted-zn-ii-phthalocyanine-synthesis-characterization-dna-bsa-binding-dna-photocleavage-and-topoisomerase-i-inhibition
#7
Burak Barut, Ümit Demirbaş, Arzu Özel, Halit Kantekin
In this study, novel peripherally tetra 3-morpholinophenol substituted zinc(II) phthalocyanine (4) and its water soluble form quaternized zinc(II) phthalocyanine (ZnQ) were synthesized for the first time. These novel compounds were characterized by a combination of different spectroscopic techniques such as FT-IR, (1)H NMR, (13)C NMR, UV-Vis and mass. The DNA binding of ZnQ was investigated using UV-vis absorption titration, competitive ethidium bromide, thermal denaturation and viscosity experiments that the ZnQ bound to CT-DNA via intercalation mode...
July 15, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28678497/excited-state-dynamics-of-a-photobiologically-active-ru-ii-dyad-are-altered-in-biologically-relevant-environments
#8
Christian Reichardt, Kilian R A Schneider, Tariq Sainuddin, Maria Wächtler, Sherri A McFarland, Benjamin Dietzek
In this study femtosecond and nanosecond time-resolved transient absorption spectroscopy was used to investigate the influence of ionic strength and complexity on the excited state dynamics of a Ru(II)-based metal-organic dyad. The bis-heteroleptic complex [Ru(bpy)2(ippy)](2+) (1), where bpy = 2,2'-bipyridine and ippy = 2-(1-pyrenyl-1H-imidazo[4,5-f][1,10]phenanthroline, is a potent photosensitizer for in vitro photodynamic therapy (PDT) and photodynamic inactivation (PDI) of microorganisms owing to a long-lived triplet excited state derived from a metal-to-ligand charge-transfer ((3)MLCT) state that is equilibrium with an intraligand ((3)IL) state...
July 25, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28657372/phthalocyanine-induced-phototherapy-coupled-with-doxorubicin-a-promising-novel-treatment-for-breast-cancer
#9
REVIEW
Eric Chekwube Aniogo, Blassan Plackal Adimuriyil George, Heidi Abrahamse
Globally, breast cancer is the most common life-threatening malignant disease among women. Adjuvant chemotherapeutic treatment of anthracycline-based chemotherapy (e.g., doxorubicin) has been shown to be more advantageous over non-anthracycline-based therapies, yet possess the tenacity of developing resistance and potential side effects which have limited its use in the clinical setting. These reasons necessitate combining doxorubicin with emerging photodynamic treatment regimens. Areas covered: In this review, the authors have concisely explained doxorubicin chemotherapy and the photobiological processes of phthalocyanine triggered photodynamic therapy (PDT)...
August 2017: Expert Review of Anticancer Therapy
https://www.readbyqxmd.com/read/28648816/how-light-affects-the-life-of-botrytis
#10
REVIEW
Julia Schumacher
Fungi, like other organisms, actively sense the environmental light conditions in order to drive adaptive responses, including protective mechanisms against the light-associated stresses, and to regulate development. Ecological niches are characterized by different light regimes, for instance light is absent underground, and light spectra from the sunlight are changed underwater or under the canopy of foliage due to the absorption of distinct wavelengths by bacterial, algal and plant pigments. Considering the fact that fungi have evolved to adapt to their habitats, the complexities of their 'visual' systems may vary significantly...
June 23, 2017: Fungal Genetics and Biology: FG & B
https://www.readbyqxmd.com/read/28633106/selective-photocytotoxicity-of-anthrols-on-cancer-stem-like-cells-the-effect-of-quinone-methides-or-reactive-oxygen-species
#11
Lidija Uzelac, Đani Škalamera, Kata Mlinarić-Majerski, Nikola Basarić, Marijeta Kralj
Cancer stem cells (CSCs) are a subpopulation of cancer cells that share properties of embryonic stem cells like pluripotency and self-renewal and show increased resistance to chemo- and radiotherapy. Targeting CSC, rather than cancer cells in general, is a novel and promising strategy for cancer treatment. Novel therapeutic approaches, such as photodynamic therapy (PDT) have been investigated. A promising group of phototherapeutic agents are reactive intermediates - quinone methides (QMs). This study describes preparation of QM precursor, 2-hydroxy-3-hydroxymethylanthracene (2) and a detailed photochemical and photobiological investigation on similar anthracene derivatives 3 and 4...
September 8, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28597924/introduction
#12
Nihal Ahmad
No abstract text is available yet for this article.
July 2017: Photochemistry and Photobiology
https://www.readbyqxmd.com/read/28549611/successful-short-desensitization-treatment-protocol-with-narrowband-uvb-phototherapy-tl-01-in-polymorphic-light-eruption
#13
A Combalia, C Fernández-Sartorio, X Fustà, D Morgado-Carrasco, S Podlipnik, P Aguilera
INTRODUCTION: Polymorphic light eruption (PLE) is a common idiopathic photodermatosis that typically presents with pruritic papular or papulovesicular lesions on sun-exposed skin between spring and autumn. In many subjects PLE is mild, and can usually be prevented by the use of broad-spectrum topical sunscreens and a gradual increase in sunlight exposure. However, in some individuals, sunlight exposure results in florid PLE and they often benefit from prophylactic desensitization treatment using phototherapy in early spring, an artificial method that induces a "hardening" phenomenon...
May 23, 2017: Actas Dermo-sifiliográficas
https://www.readbyqxmd.com/read/28543667/panchromatic-osmium-complexes-for-photodynamic-therapy-solutions-to-existing-problems-and-new-questions
#14
Edith C Glazer
This article is a highlight of the paper by Lazic et al. in this issue of Photochemistry and Photobiology. It describes the validation of osmium coordination complexes as photosensitizers for photodynamic therapy, with very promising in vivo results that demonstrate radical improvements in survival following irradiation with visible (635 nm) or near-IR (NIR; 808 nm) light. An unusual feature in the study is that the different complexes exhibit disparate photophysical and photobiological characteristics, despite sharing common structural motifs...
May 23, 2017: Photochemistry and Photobiology
https://www.readbyqxmd.com/read/28529796/crystal-structure-of-di-bromo-meth-oxy-seselin-dbms-a-photobiologically-active-pyran-ocoumarin
#15
A K Bauri, Sabine Foro, A F M M Rahman
The title compound, C15H14Br2O4 [systematic name: rac-(9S,10R)-3,9-dibromo-10-methoxy-8,8-dimethyl-9,10-dihydropyrano[2,3-h]chromen-2(8H)-one], is a pyran-ocoumarin derivative formed by the bromination of seselin, which is a naturally occurring angular pyran-ocoumarin isolated from the Indian herb Trachyspermum stictocarpum. In the mol-ecule, the benzo-pyran ring system is essentially planar, with a maximum deviation of 0.044 (2) Å for the O atom. The di-hydro-pyran ring is in a half-chair conformation and the four essentially planar atoms of this ring form a dihedral angle of 4...
May 1, 2017: Acta Crystallographica. Section E, Crystallographic Communications
https://www.readbyqxmd.com/read/28513845/claud-s-rupert-1919-2017-the-father-of-dna-repair
#16
Aziz Sancar
No abstract text is available yet for this article.
July 2017: Photochemistry and Photobiology
https://www.readbyqxmd.com/read/28500709/the-expanded-red-green-cyanobacteriochrome-lineage-an-evolutionary-hot-spot
#17
Keiji Fushimi, Masahiko Ikeuchi, Rei Narikawa
This article highlights the paper by Rockwell et al. in the current issue of Photochemistry and Photobiology. Rockwell et al. describe the discovery of novel two-Cys photocycles within the "expanded red/green" (XRG) cyanobacteriochrome (CBCR) lineage. Comprehensive phylogenetic analysis revealed that several XRG CBCRs possess a second Cys residue in the DXCF (Asp-Xaa-Cys-Phe) motif conserved among the DXCF CBCR lineage. Spectral studies identified that these CBCRs showed green/blue or ultraviolet/blue reversible photoconversion abilities...
May 2017: Photochemistry and Photobiology
https://www.readbyqxmd.com/read/28480921/electronic-relaxation-pathways-of-the-biologically-relevant-pterin-chromophore
#18
R M DiScipio, R Y Santiago, D Taylor, C E Crespo-Hernández
Pterin derivatives are endogenous photosensitizers common to every biological kingdom and are involved in numerous photobiological processes for which they have received widespread attention. Despite the photobiological relevance of the pterin compounds, their excited-state dynamics have not been investigated rigorously-an undertaking that must begin with a thorough understanding of the photophysics of the common core chromophore, 2-amino-1H-pteridin-4-one (a.k.a. pterin). In this contribution, direct observation of the ultrafast excited-state dynamics of pterin in aqueous borate buffered solution at pH 10...
May 24, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28463378/the-photochemistry-and-photobiology-of-vitamin-b12
#19
Alex R Jones
Biologically active derivatives of vitamin B12 are organometallic cobalt-corrinoid complexes crucial for the healthy function of humans, animals and microbes. Their role as cofactors to numerous, thermally-driven metabolic enzymes is well described, and varies depending on the nature of the upper axial ligand. This ligand also significantly influences the photophysics and photochemistry of B12. In this Perspective I will discuss the various aspects of B12 photochemistry, from its dynamic spin chemistry to the considerable potential it has for biotechnology applications...
June 14, 2017: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/28386667/dynamic-modeling-of-temperature-change-in-outdoor-operated-tubular-photobioreactors
#20
Dominic Deo Androga, Basar Uyar, Harun Koku, Inci Eroglu
In this study, a one-dimensional transient model was developed to analyze the temperature variation of tubular photobioreactors operated outdoors and the validity of the model was tested by comparing the predictions of the model with the experimental data. The model included the effects of convection and radiative heat exchange on the reactor temperature throughout the day. The temperatures in the reactors increased with increasing solar radiation and air temperatures, and the predicted reactor temperatures corresponded well to the measured experimental values...
April 6, 2017: Bioprocess and Biosystems Engineering
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