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Wei-Hai Chen, Guo-Feng Luo, Wen-Xiu Qiu, Qi Lei, Li-Han Liu, Shi-Bo Wang, Xian-Zheng Zhang
Supramolecular photosensitizers (supraPSs) have emerged as effective photodynamic therapy (PDT) agents. Here, we propose the assembling capacity of supraPSs as a new strategy to construct theranostic nanoplatform with versatile functions aming at high-performance tumor therapy. By coating tirapazamine (TPZ)-loaded mesoporous silica nanoparticles (MSNs) with layer-by-layer (LbL) assembled multilayer, the versatile nanoplatform (TPZ@MCMSN-Gd(3+)) was obtained with the formation of supraPSs via host-guest interaction and the chelation with paramagnetic Gd(3+)...
December 1, 2016: Biomaterials
Maria Luiza Mendes de Almeida, Walter Heinz Feringer, Júlia Ribeiro Garcia Carvalho, Isadora Mestriner Rodrigues, Lilian Rezende Jordão, Mayara Gonçalves Fonseca, Adalgiza Souza Carneiro de Rezende, Antonio de Queiroz Neto, J Scott Weese, Márcio Carvalho da Costa, Eliana Gertrudes de Macedo Lemos, Guilherme de Camargo Ferraz
Recent studies performed in humans and rats have reported that exercise can alter the intestinal microbiota. Athletic horses perform intense exercise regularly, but studies characterizing horse microbiome during aerobic conditioning programs are still limited. Evidence has indicated that this microbial community is involved in the metabolic homeostasis of the host. Research on ergogenic substances using new sequencing technologies have been limited to the intestinal microbiota and there is a considerable demand for scientific studies that verify the effectiveness of these supplements in horses...
2016: PloS One
Judith Behnsen, Manuela Raffatellu
Siderophores are small molecular iron chelators that are produced by microbes and whose most notable function is to sequester iron from the host and provide this essential metal nutrient to microbes. Recent studies have proposed additional, noncanonical roles for siderophores, including the acquisition of noniron metals and modulation of host functions. Recently, Holden et al. (V. I. Holden, P. Breen, S. Houle, C. M. Dozois, and M. A. Bachman, mBio 7:e01397-16, 2016, showed that siderophores secreted by Klebsiella pneumoniae during lung infection induce stabilization of the transcription factor HIF-1α, increase the expression of proinflammatory cytokines in the lung, and promote dissemination of K...
November 15, 2016: MBio
Sujith Kakkattu S, Chelat Narayana Panicker Ramachandran
Natural gas extraction from gas hydrate sediments by injection of hydrate inhibitors involves the decomposition of hydrates. The evolution of dissolved gas from the hydrate melt is an important step in the extraction process. Using classical molecular dynamics simulations, we study the evolution of dissolved methane from its hydrate melt in presence of two thermodynamic hydrate inhibitors, NaCl and CH3OH. An increase in the concentration of hydrate inhibitors is found to promote the nucleation of methane nanobubbles in the hydrate melt...
December 9, 2016: Journal of Physical Chemistry. B
Mohd Asif Ansari, Abhishek Mandal, Alexa Paretzki, Katharina Beyer, Wolfgang Kaim, Goutam Kumar Lahiri
5,7,12,14-Tetraazapentacene-6,13-quinone (L) reacts with 2 equiv of [Ru(acac)2(CH3CN)2] to form two linkage isomeric bis(chelate) compounds, [{Ru(II)(acac)2}2(μ-L)], blue 1, with 5,6;12,13 coordination and violet 2 with 5,6;13,14 coordination. The linkage isomers could be separated, structurally characterized in crystals as rac diastereomers (ΔΔ/ΛΛ), and studied by voltammetry (CV, DPV), EPR, and UV-vis-NIR spectroelectrochemistry (meso-1, rac-2). DFT and TD-DFT calculations support the structural and spectroscopic results and suggest a slight energy preference (ΔE = 263 cm(-1)) for the rac-isomer 1 as compared to 2...
December 5, 2016: Inorganic Chemistry
Yan He, Ningning Zhao, Liqi Qiu, Xinying Zhang, Xuesen Fan
An efficient and regioselective remote C(5)-H nitration of 8-aminoquinoline amides by using the economical and nontoxic Fe(NO3)3·9H2O as promoter and nitro source has been developed. Furthermore, when CuCl2·2H2O was used as a catalyst, 8-aminoquinoline amides dominantly underwent bisnitration to give 5,7-dinitro-8-aminoquinoline amides. Notably, this is the first example in which Fe(NO3)3·9H2O plays a dual role as both chelating promoter and nitration reagent, and CuCl2·2H2O acts as an efficient catalyst for the bisnitration of quinolines...
December 2, 2016: Organic Letters
Eppa Gyanchander, Sridhar Ydhyam, Naresh Tumma, Ken Belmore, Jin Kun Cha
A comparison study of the Ru(II)-catalyzed rearrangements of allenyl- and alkynylcyclopropanols to the corresponding cyclopentenones has been undertaken with the aid of an alkyl substituent on the three-membered ring. These ring expansion reactions proceed with exceptional regioselectivity irrespective of the cis/trans stereochemistry of the substituents on the three-membered ring. β-Carbon elimination is the common feature in the absence of a chelating group at the 4'-position in the alkyne chain.
December 2, 2016: Organic Letters
Doris Y Melgarejo, Gina M Chiarella, John P Fackler
Three crystalline trinuclear gold(I) clusters, [Au3f2y] (1), [Au3fy2] (2), and [Au3y3] (3), where f = N,N'-bis(2,6-dimethylphenyl)methanimidamidate and y = dimethylendiphenylphosphinate, exhibit bridges from the N,N-formamidinate and/or from the ylide anion ligand whose P-methylene groups chelate in an unusual fashion, where the chelate CPC unit is perpendicular to the trigonal plane of the metal atoms. Assemblies 1 and 2 are the first gold(I) trinuclear clusters featuring mixed-ligand bridges from different N,N and C,C donors; 3 is a previously unknown homoleptic ylide anion cyclic trinuclear assembly...
November 21, 2016: Inorganic Chemistry
Victor H F Bernardes, Yun Qu, Zhifeng Du, James Beaton, Maria D Vargas, Nicholas P Farrell
The human immunodeficiency virus (HIV) nucleocapsid protein (NCp7) plays significant roles in the virus life cycle and has been targeted by compounds that could lead to its denaturation or block its interaction with viral RNA. Herein, we describe the interactions of platinum(II) and gold(III) complexes with NCp7 and how the reactivity/affinity of potential inhibitors can be modulated by judicious choice of ligands. The interactions of [MCl(N3)](n+) (M = Pt(2+) (n = 1) and Au(3+) (n = 2); N3 = tridentate chelate ligands: bis(2-pyridylmethyl)methylamine (Mebpma, L(1)) and bis(2-pyridylmethyl)amine (bpma, L(2)) with the C-terminal zinc finger of NCp7 (ZF2) were investigated by electrospray ionization-mass spectroscopy (ESI-MS)...
November 7, 2016: Inorganic Chemistry
Minfeng Zeng, Yudong Wang, Qi Liu, Xia Yuan, Shufeng Zuo, Ruokun Feng, Jing Yang, Baoyi Wang, Chenze Qi, Yao Lin
Metal nanoparticles, once supported by a suitable scaffolding material, can be used as highly efficient heterogeneous catalysts for numerous organic reactions. The challenge, though, is to mitigate the continuous loss of metals from the supporting materials as reactions proceed, so that the catalysts can be recycled multiple times. Herein, we combine the excellent chelating property of chitosan (CS) and remarkable stability of montmorillonite (MMT) into a composite material to support metal catalysts such as palladium (Pd)...
December 7, 2016: ACS Applied Materials & Interfaces
Lu Zhang, Huilan Su, Jiali Cai, Dengfeng Cheng, Yongjie Ma, Jianping Zhang, Chuanqing Zhou, Shiyuan Liu, Hongcheng Shi, Yingjian Zhang, Chunfu Zhang
Image-guided combined chemo-thermal therapy assists in optimizing treatment time, enhancing therapeutic efficiency, and circumventing side effects. In the present study, we developed a chemo-photothermal theranostic platform based on polydopamine (PDA)-coated gold nanorods (GNRs). The PDA coating was thin; however, it significantly suppressed the cytotoxicity of the cetyltrimethylammonium bromide template and allowed high cisplatin loading efficiency, arginine-glycine-aspartic acid (RGD) peptide (c(RGDyC)) conjugation, and chelator-free iodine-125 labeling (RGD-(125)IPt-PDA@GNRs)...
November 22, 2016: ACS Nano
Katja Branitzki-Heinemann, Helene Möllerherm, Lena Völlger, Diab M Husein, Nicole de Buhr, Stefanie Blodkamp, Friederike Reuner, Graham Brogden, Hassan Y Naim, Maren von Köckritz-Blickwede
Since their discovery, neutrophil extracellular traps (NETs) have been characterized as a fundamental host innate immune defense mechanism. Conversely, excessive NET-release may have a variety of detrimental consequences for the host. A fine balance between NET formation and elimination is necessary to sustain a protective effect during an infectious challenge. Our own recently published data revealed that stabilization of hypoxia-inducible factor 1α (HIF-1α) by the iron chelating HIF-1α-agonist desferoxamine or AKB-4924 enhanced the release of phagocyte extracellular traps...
2016: Frontiers in Immunology
Matthew W L Lau, Robert J Trachman, Adrian R Ferré-D'Amaré
Ribozymes employ divalent cations for structural stabilization, as catalytic cofactors, or both. Because of the prominent role of Ca2+ in intracellular signaling, engineered ribozymes with stringent Ca2+ selectivity would be important in biotechnology. The wild-type glmS ribozyme (glmSWT) requires glucosamine-6-phosphate (GlcN6P) as a catalytic cofactor. Previously, a glmS ribozyme variant with three adenosine mutations (glmSAAA) was identified, which dispenses with GlcN6P and instead uses, with little selectivity, divalent cations as cofactors for site-specific RNA cleavage...
December 8, 2016: RNA
Elisa Ferro, Giuseppa Visalli, Maria Angela La Rosa, Basilia Piraino, Rosa Civa, Gaetano Randazzo Papa, Angela Di Pietro
In previously reported studies, we observed significantly high genotoxicity biomarkers in regularly transfused thalassaemic patients, thus, in this study, we better investigated the genotoxic effect of iron overload and of thalassaemia complications, including their drug treatments. The assessment was performed in 64 regularly transfused thalassaemic patients using cytokinesis-block micronucleus and comet assays. All patients were splenectomised and undergoing iron chelation therapy. To reduce hypoxia-induced oxidative damage, the patients with haemoglobin levels <9...
December 8, 2016: Mutagenesis
Chrysovalantou Mihailidou, Ioulia Chatzistamou, Athanasios Papavassiliou, Hippokratis Kiaris
AIMS: While endoplasmic reticulum (ER) stress is recognized as a major mechanism causing pancreatic dysfunction in diabetes, little is known on how aging modulates the process. Here we compared the response to ER stress, viability and insulin release from pancreatic islets of young (6 weeks) or aged (14 months) mice. RESULTS: Islets from aged mice were more sensitive to ER stress than their younger counterparts, they exhibited more pronounced unfolded protein response (UPR) and caspase activation and displayed compromised insulin release after high glucose stimulation...
December 8, 2016: Antioxidants & Redox Signaling
Sarah S Damasceno, Bruna B Dantas, Demetrius Antônio M Araújo, José Galberto M da Costa
Caffeic and ferulic acids have been extensively evaluated for their antioxidant properties in biological system, such activity is responsible for limiting the excessive production of free radical species, that are associated with cell proliferation. However, more recent studies suggest chemopreventive action of these phenolic acids through the regulation of gene expression, chelation and / or reduction of transition metals, covalent adduct formation (which damage DNA) and toxicity. The biological efficacy of these promising chemopreventive agents depends strongly on their chemical structure...
December 8, 2016: Current Pharmaceutical Design
Naser Mobarra, Mehrnoosh Shanaki, Hassan Ehteram, Hajar Nasiri, Mehdi Sahmani, Mohsen Saeidi, Mehdi Goudarzi, Hoda Pourkarim, Mehdi Azad
Iron chelation therapy is used to reduce iron overload development due to its deposition in various organs such as liver and heart after regular transfusion. In this review, different iron chelators implicated in treatment of iron overload in various clinical conditions have been evaluated using more up-to-date studies focusing on these therapeutic agents. Deferoxamine, Deferiprone and Deferasirox are the most important specific US FDA-approved iron chelators. Each of these chelators has their own advantages and disadvantages, various target diseases, levels of deposited iron and clinical symptoms of the afflicted patients which may affect their selection as the best modality...
October 1, 2016: International Journal of Hematology-oncology and Stem Cell Research
Meysam Seyedifar, Farid Abedin Dorkoosh, Amir Ali Hamidieh, Majid Naderi, Hossein Karami, Mehran Karimi, Masoomeh Fadaiyrayeny, Masoumeh Musavi, Sanaz Safaei, Mohammad Mahdi Ahmadian-Attari, Molouk Hadjibabaie, Abdol Majid Cheraghali, Ali Akbari Sari
Background: Thalassemia is a chronic, inherited blood disorder, which in its most severe form, causes life-threatening anemia. Thalassemia patients not only engage with difficulties of blood transfusion and iron chelating therapy but also have some social challenges and health threatening factors. There are some reports on quality of life in thalassemia patients around the world from southeast of Asia to Italy in Europe and United States. In this study, we tried to evaluate and compare Health Related Quality of life (HRQoL) and the health utility in beta thalassemia major patients receiving different types of iron chelators and living in different socio-economical situations...
October 1, 2016: International Journal of Hematology-oncology and Stem Cell Research
Behzad Alizadeh, Zahra Badiee, Mahmoud Mahmoudi, Mahsa Mohajery
Background: N-terminal pro-brain natriuretic peptide (NT-proBNP) is a sensitive biomarker for the detection of asymptomatic left ventricular (LV) dysfunction. Since β-thalassemia major patients suffer from early diastolic dysfunction due to iron deposition of chronic blood transfusion, we tried to evaluate the correlation between the serum NT-proBNP level and the severity of LV diastolic dysfunction determined by echocardiography in these patients. Methods: Fifty β-thalassemia major patients with normal LV systolic function were studied by tissue Doppler echocardiography, and blood samples were taken at the same time to measure the serum NT-proBNP level...
April 13, 2016: Journal of Tehran Heart Center
Stephen Adeniyi Adefegha, Tosin Abiola Olasehinde, Ganiyu Oboh
This study was designed to assess the antioxidant, antidiabetic and antihypertensive effects of essential oils from A. melegueta and A. danielli seeds. The essential oils were extracted via hydrodistillation, dried with anhydrous Na2SO4 and characterized using gas chromatography-mass spectrometry (GC-MS). Antioxidant properties and inhibition of some pro-oxidant induced lipid peroxidation in rats' pancreas and heart homogenates were also determined. The results revealed that eugenol, eucalyptol, α-terpineol, α-caryophyllene and β-caryophyllene were the most abundant components in A...
December 8, 2016: Journal of Oleo Science
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