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https://www.readbyqxmd.com/read/28678497/excited-state-dynamics-of-a-photobiologically-active-ru-ii-dyad-are-altered-in-biologically-relevant-environments
#1
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 (3MLCT) state that is equilibrium with an intraligand (3IL) state...
July 5, 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
#2
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)...
July 3, 2017: Expert Review of Anticancer Therapy
https://www.readbyqxmd.com/read/28648816/how-light-affects-the-life-of-botrytis
#3
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
#4
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
#5
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
#6
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
#7
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
#8
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
#9
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
#10
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
#11
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
#12
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
#13
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
https://www.readbyqxmd.com/read/28383082/outstanding-reviewers-for-photochemical-photobiological-sciences-in-2016
#14
EDITORIAL
(no author information available yet)
No abstract text is available yet for this article.
April 6, 2017: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/28370264/novel-osmium-based-coordination-complexes-as-photosensitizers-for-panchromatic-photodynamic-therapy
#15
Savo Lazic, Pavel Kaspler, Ge Shi, Susan Monro, Tariq Sainuddin, Sarah Forward, Kamola Kasimova, Robie Hennigar, Arkady Mandel, Sherri McFarland, Lothar Lilge
Cancer remains a major global malaise requiring the advent of new, efficient, and low-cost treatments. Photodynamic therapy, which combines a photosensitizer and photons to produce cytotoxic reactive oxygen species, has been established as an effective cancer treatment but has yet to become mainstream. One of the main limitations has been the paucity of photosensitizers that are effective over a wide range of wavelengths, can exert their cytotoxic effects in hypoxia, are easily synthesized, and produce few if any side effects...
April 3, 2017: Photochemistry and Photobiology
https://www.readbyqxmd.com/read/28341348/the-impact-of-oral-polypodium-leucotomos-extract-on-ultraviolet-b-response-a-human-clinical-study
#16
Indermeet Kohli, Rubina Shafi, Prescilia Isedeh, James L Griffith, Mohammed S Al-Jamal, Narumol Silpa-Archa, Bradford Jackson, Mohammed Athar, Nikiforos Kollias, Craig A Elmets, Henry W Lim, Iltefat H Hamzavi
BACKGROUND: There is a rationale for adding systemic photoprotective agents to the current photoprotection regimen. OBJECTIVE: This study was designed to objectively evaluate the molecular and photobiologic effects of oral administration of Polypodium leucotomos extract (PLE). METHODS: In all, 22 subjects with Fitzpatrick skin phototype I to III were enrolled. On day 1, subjects were irradiated with visible light, ultraviolet (UV) A1, and UVB (using 308-nm excimer laser)...
July 2017: Journal of the American Academy of Dermatology
https://www.readbyqxmd.com/read/28329062/comparison-of-demographic-and-photobiological-features-of-chronic-actinic-dermatitis-in-patients-with-lighter-vs-darker-skin-types
#17
Ki-Wei Tan, Ann K Haylett, Tsui C Ling, Lesley E Rhodes
Importance: Chronic actinic dermatitis (CAD) is classically described in older, white men, although increasing reports describe younger patients with darker skin types, particularly South Asians. Photocontact allergy occurs in CAD but is less studied than contact allergy in this exquisitely photosensitive condition. Objective: To evaluate for differences in demographic and photobiological features between persons with darker and lighter skin types who have CAD. Design, Setting, and Participants: This retrospective review included 70 consecutive adult patients (≥18 years) undergoing investigation for photosensitivity who were diagnosed with CAD from November 1, 2000, through August 31, 2015, at the specialist Photobiology Unit of a tertiary academic referral center...
May 1, 2017: JAMA Dermatology
https://www.readbyqxmd.com/read/28322269/a-ras-gtpase-associated-protein-is-involved-in-the-phototropic-and-circadian-photobiology-responses-in-fungi
#18
Silvia Polaino, José M Villalobos-Escobedo, Viplendra P S Shakya, Alejandro Miralles-Durán, Suman Chaudhary, Catalina Sanz, Mahdi Shahriari, Eva M Luque, Arturo P Eslava, Luis M Corrochano, Alfredo Herrera-Estrella, Alexander Idnurm
Light is an environmental signal perceived by most eukaryotic organisms and that can have major impacts on their growth and development. The MadC protein in the fungus Phycomyces blakesleeanus (Mucoromycotina) has been postulated to form part of the photosensory input for phototropism of the fruiting body sporangiophores, but the madC gene has remained unidentified since the 1960s when madC mutants were first isolated. In this study the madC gene was identified by positional cloning. All madC mutant strains contain loss-of-function point mutations within a gene predicted to encode a GTPase activating protein (GAP) for Ras...
March 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28316830/crystal-structure-of-a-photobiologically-active-brominated-angular-pyran-ocoumarin-bromo-hy-droxy-seselin
#19
A K Bauri, Sabine Foro, A F M Mustafizur Rahman
The title compound, C14H13BrO3 [systematic name: rac-(9S,10R)-9-bromo-10-hy-droxy-8,8-dimethyl-9,10-di-hydro-2H,8H-pyrano[2,3-f]chromen-2-one], is a substituted pyran-ocoumarin, obtained by bromination of seselin [8,8-dimethyl-2H,8H-pyrano[2,3-f]chromen-2-one], which was isolated from the Indian herb Trachyspermum stictocarpum (Aajmod). The pyrano ring has a distorted half-chair conformation and its mean plane is inclined to the coumarin mean plane by 1.6 (2)°. In the crystal, mol-ecules are linked by pairs of O-H⋯O hydrogen bonds, forming inversion dimers with an R(2)2(16) ring motif...
March 1, 2017: Acta Crystallographica. Section E, Crystallographic Communications
https://www.readbyqxmd.com/read/28301148/synthesis-and-photobiological-activity-of-ru-ii-dyads-derived-from-pyrrole-2-carboxylate-thionoesters
#20
Deborah A Smithen, Huimin Yin, Michael H R Beh, Marc Hetu, T Stanley Cameron, Sherri A McFarland, Alison Thompson
The synthesis and characterization of a series of heteroleptic ruthenium(II) dyads derived from pyrrole-2-carboxylate thionoesters are reported. Ligands bearing a conjugated thiocarbonyl group were found to be more reactive toward Ru(II) complexation compared to analogous all-oxygen pyrrole-2-carboxylate esters, and salient features of the resulting complexes were determined using X-ray crystallography, electronic absorption, and NMR spectroscopy. Selected complexes were evaluated for their potential in photobiological applications, whereupon all compounds demonstrated in vitro photodynamic therapy effects in HL-60 and SK-MEL-28 cells, with low nanomolar activities observed, and exhibited some of the largest photocytotoxicity indices to date (>2000)...
April 3, 2017: Inorganic Chemistry
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