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https://www.readbyqxmd.com/read/29342189/the-microbiota-metabolite-indole-inhibits-salmonella-virulence-involvement-of-the-phopq-two-component-system
#1
Nandita Kohli, Zeni Crisp, Rebekah Riordan, Michael Li, Robert C Alaniz, Arul Jayaraman
The microbial community present in the gastrointestinal tract is an important component of the host defense against pathogen infections. We previously demonstrated that indole, a microbial metabolite of tryptophan, reduces enterohemorrhagic Escherichia coli O157:H7 attachment to intestinal epithelial cells and biofilm formation, suggesting that indole may be an effector/attenuator of colonization for a number of enteric pathogens. Here, we report that indole attenuates Salmonella Typhimurium (Salmonella) virulence and invasion as well as increases resistance to colonization in host cells...
2018: PloS One
https://www.readbyqxmd.com/read/29328884/evaluation-of-g2-citric-acid-based-dendrimer-as-an-adjuvant-in-veterinary-rabies-vaccine
#2
Vahid Asgary, Alireza Shoari, Majid Afshar Moayad, Mehdi Shafiee Ardestani, Razieh Bigdeli, Leila Ghazizadeh, Mohammad Sadeq Khosravy, Erfan Panahnejad, Alireza Janani, Rouzbeh Bashar, Maliheh Abedi, Reza Ahangari Cohan
For induction of an appropriate immune response, especially in the case of an inactivated vaccine, the use of an adjuvant is crucial. In this study, adjuvanticity effect of G2 dendrimer in veterinary rabies vaccine has been investigated. A nonlinear globular G2 dendrimer comprising citric acid and polyethylene glycol 600 (PEG-600) was synthesized and the toxicity was studied in vitro on the J774A.1 cell line. The adjuvanticity effect of the dendrimer was then investigated on rabies virus in NMRI mice as a model...
January 2018: Viral Immunology
https://www.readbyqxmd.com/read/29326966/transcriptome-datasets-of-macrophages-infected-with-different-strains-of-leptospira-spp
#3
Erivelto Corrêa de Araújo Junior, Leandro Encarnação Garcia, Larissa Martins Melo, Jaqueline Poleto Bragato, Valéria Marçal Félix de Lima, Juliana Regina Peiró, Flavia Lombardi Lopes, Márcia Marinho
The datasets reported herein provide information about microarray experiment of macrophage cell line J774A.1 infected with three different strains of Leptospira spp. Transcriptomic profiles were generated using Affymetrix® Mouse Gene 2.1 ST Array Strip. Data was normalized and statically process, p-value < 0.01, FDR < 0.05 and log2 fold change (± 2). The microarray raw data are available in Gene Expression Omnibus (GEO) under accession number GSE105141.
February 2018: Data in Brief
https://www.readbyqxmd.com/read/29307805/mannose-conjugated-curcumin-chitosan-nanoparticles-efficacy-and-toxicity-assessments-against-leishmania-donovani
#4
Pramila Chaubey, Brahmeshwar Mishra, Shyam Lal Mudavath, Ravi R Patel, Sundeep Chaurasia, Shyam Sundar, Vasanti Suvarna, Marvis Monteiro
Aim was to fabricate and optimize CUR-loaded mannose-functionalized chitosan nanoparticles (Cur-MCN) which overcome the limitations of drugs to reach the intracellular locations and to establish its therapeutic potential in visceral leishmaniasis by targeting of CUR to macrophages. Cur-MCN were developed by mannose-conjugated chitosan and have been tested for their efficacy and toxicit. In vivo antileishmanial activity in hamsters has shown significantly greater suppression of parasite replication in the spleen with Cur-MCN than unconjugated chitosan nanoparticles...
January 4, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29289281/mesoporous-carbon-nanomaterials-induced-pulmonary-surfactant-inhibition-cytotoxicity-inflammation-and-lung-fibrosis
#5
Yunan Chen, Yi Yang, Bolong Xu, Shunhao Wang, Bin Li, Juan Ma, Jie Gao, Yi Y Zuo, Sijin Liu
Environmental exposure and health risk upon engineered nanomaterials are increasingly concerned. The family of mesoporous carbon nanomaterials (MCNs) is a rising star in nanotechnology for multidisciplinary research with versatile applications in electronics, energy and gas storage, and biomedicine. Meanwhile, there is mounting concern on their environmental health risks due to the growing production and usage of MCNs. The lung is the primary site for particle invasion under environmental exposure to nanomaterials...
December 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29260183/mobilization-of-iron-from-ferritin-new-steps-and-details
#6
A La, T Nguyen, K Tran, E Sauble, D Tu, A Gonzalez, T Z Kidane, C Soriano, J Morgan, M Doan, K Tran, C-Y Wang, M D Knutson, M C Linder
Much evidence indicates that iron stored in ferritin is mobilized through protein degradation in lysosomes, but concerns about this process have lingered, and the mechanistic details of its aspects are lacking. In the studies presented here, 59Fe-labeled ferritin was induced by preloading hepatic (HepG2) cells with radiolabeled Fe. Placing these cells in a medium containing desferrioxamine resulted in the loss of ferritin-59Fe, but adding high concentrations of reducing agents or modulating the internal GSH concentration failed to alter the rates of ferritin-59Fe release...
December 20, 2017: Metallomics: Integrated Biometal Science
https://www.readbyqxmd.com/read/29248928/differential-kinetics-of-aspergillus-nidulans-and-aspergillus-fumigatus-phagocytosis
#7
Mark S Gresnigt, Katharina L Becker, Floris Leenders, M Fernanda Alonso, Xiaowen Wang, Jacques F Meis, Judith M Bain, Lars P Erwig, Frank L van de Veerdonk
Invasive aspergillosis mainly occurs in immunocompromised patients and is commonly caused by Aspergillus fumigatus, while A.nidulans is rarely the causative agent. However, in chronic granulomatous disease (CGD) patients, A. nidulans is a frequent cause of invasive aspergillosis and is associated with higher mortality. Immune recognition of A. nidulans was compared to A. fumigatus to offer an insight into why A. nidulans infections are prevalent in CGD. Live cell imaging with J774A.1 macrophage-like cells and LC3-GFP-mCherry bone marrow-derived macrophages (BMDMs) revealed that phagocytosis of A...
December 16, 2017: Journal of Innate Immunity
https://www.readbyqxmd.com/read/29237286/redox-sensing-under-hypochlorite-stress-and-infection-conditions-by-the-rrf2-family-repressor-hypr-in-staphylococcus-aureus
#8
Vu Van Loi, Tobias Busche, Jörg Bernhardt, Karsten Tedin, Jan Wollenhaupt, Nguyen Thi Thu Huyen, Chris Weise, Jörn Kalinowski, Markus Wahl, Marcus Fulde, Haike Antelmann
AIMS: Staphylococcus aureus is a major human pathogen and has to cope with reactive oxygen and chlorine species (ROS, RCS) during infections, which requires efficient protection mechanisms to avoid destruction. Here, we have investigated the changes in the RNA-seq transcriptome by the strong oxidant NaOCl in S. aureus USA300 to identify novel redox-sensing mechanisms that provide protection under infection conditions. RESULTS: NaOCl stress caused an oxidative stress response in S...
December 14, 2017: Antioxidants & Redox Signaling
https://www.readbyqxmd.com/read/29235265/synthesis-of-%C3%AE-branched-acyclic-nucleoside-phosphonates-as-potential-inhibitors-of-bacterial-adenylate-cyclases
#9
Jan Frydrych, Jan Skácel, Markéta Šmídková, Helena Mertlíková-Kaiserová, Martin Dračínský, Ramachandran Gnanasekaran, Martin Lepšík, Monica Soto-Velasquez, Val J Watts, Zlatko Janeba
Inhibition of Bordetella pertussis adenylate cyclase toxin (ACT) and Bacillus anthracis edema factor (EF), the key virulence factors with adenylate cyclase (AC) activity, represents a potential method how to treat or prevent toxemia related to whooping cough and anthrax, respectively. A novel series of α-branched acyclic nucleoside phosphonates (ANPs) having a hemiaminal ether moiety was synthesized as potential inhibitors of bacterial adenylate cyclases. ANPs prepared as bisamidates were not cytotoxic but did not exhibited any profound activity (IC50 > 10 µM) towards ACT in J774A...
December 13, 2017: ChemMedChem
https://www.readbyqxmd.com/read/29234575/involvement-of-two-uptake-mechanisms-of-gold-and-iron-oxide-nanoparticles-in-a-co-exposure-scenario-using-mouse-macrophages
#10
Dimitri Vanhecke, Dagmar A Kuhn, Dorleta Jimenez de Aberasturi, Sandor Balog, Ana Milosevic, Dominic Urban, Diana Peckys, Niels de Jonge, Wolfgang J Parak, Alke Petri-Fink, Barbara Rothen-Rutishauser
Little is known about the simultaneous uptake of different engineered nanoparticle types, as it can be expected in our daily life. In order to test such co-exposure effects, murine macrophages (J774A.1 cell line) were incubated with gold (AuNPs) and iron oxide nanoparticles (FeO x NPs) either alone or combined. Environmental scanning electron microscopy revealed that single NPs of both types bound within minutes on the cell surface but with a distinctive difference between FeO x NPs and AuNPs. Uptake analysis studies based on laser scanning microscopy, transmission electron microscopy, and inductively coupled plasma optical emission spectrometry revealed intracellular appearance of both NP types in all exposure scenarios and a time-dependent increase...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/29205752/in-vitro-stimulatory-effect-of-n-acetyl-tryptophan-glucopyranoside-against-gamma-radiation-induced-immunosuppression
#11
Poonam Malhotra, Darshana Singh, Raj Kumar
Radiation-induced manifestations like free radical burst, oxidative damage and apoptosis leading to cell death. In present study, N-acetyl tryptophan glucopyranoside (NATG) was assessed for its immune-radioprotective activities using J774A.1 cells. Clonogenic cell survival, cell cycle progression and cytokines i.e. IFN-γ, TNF-α, IL-2, IL-10, IL-12, IL-13 and IL-17A expression were evaluated in irradiated and NATG pretreated cells using clonogenic formation ability, flow cytometry and ELISA assay. Results indicated that 0...
December 4, 2017: Environmental Toxicology
https://www.readbyqxmd.com/read/29205119/activity-of-rifabutin-and-hemi-synthetic-derivatives-against-mycobacterium-abscessus
#12
Ivy B Ramis, Ricardo Figueiredo, Daniela F Ramos, Priscila C B Halicki, Andrea von Groll, Miguel Viveiros, Maria do Ceu Costa, Pedro E A da Silva
BACKGROUND: Mycobacterium abscessus causes a wide range of clinical diseases that are difficult to treat. This microorganism is resistant not only to the classical antituberculosis agents but also to most of the antimicrobials that are currently available, resulting in limited therapeutic options and treatment failure. This scenario stresses the need to search for new drugs with activity against M. abscessus. OBJECTIVE: To evaluate in vitro the antimycobacterial activity and cytotoxicity of rifabutin (RFB 1) and ten derivatives (2-11) against M...
December 3, 2017: Medicinal Chemistry
https://www.readbyqxmd.com/read/29184154/a-leptospiral-aaa-chaperone-ntn-peptidase-complex-hsluv-contributes-to-the-intracellular-survival-of-leptospira-interrogans-in-hosts-and-the-transmission-of-leptospirosis
#13
Shi-Lei Dong, Wei-Lin Hu, Yu-Mei Ge, David M Ojcius, Xu'ai Lin, Jie Yan
Leptospirosis caused by Leptospira is a zoonotic disease of global importance but it is considered as an emerging or re-emerging infectious disease in many areas in the world. Until now, the mechanisms about pathogenesis and transmission of Leptospira remains poorly understood. As eukaryotic and prokaryotic proteins can be denatured in adverse environments and chaperone-protease/peptidase complexes degrade these harmful proteins, we speculate that infection may also cause leptospiral protein denaturation, and the HslU and HslV proteins of L...
November 29, 2017: Emerging Microbes & Infections
https://www.readbyqxmd.com/read/29160061/a-dual-macrophage-targeting-nanovector-for-delivery-of-oligodeoxynucleotides-to-overcome-cancer-associated-immunosuppression
#14
Xiao-Yan He, Bo-Ya Liu, Jin-Long Wu, Shu-Lun Ai, Ren-Xi Zhuo, Si-Xue Cheng
To overcome cancer-associated immunosuppression, we prepared a dual-targeting vector to deliver CpG oligodeoxynucleotides (ODN) to macrophages. The dual-targeting system composed of mannosylated carboxymethyl chitosan (MCMC)/hyaluronan (HA) for macrophage targeting and protamine sulfate (PS) for ODN complexation was prepared by self-assembly. The effects of ODN delivery on immune cells was studied in J774A.1 cells. Due to the enhanced delivery efficiency, the dual-targeting delivery system exhibits a higher immune stimulatory activity compared with the mono-targeting delivery system containing either MCMC or HA, resulting in dramatically enhanced secretion of pro-inflammatory cytokines and a successful shift to activated macrophages (M1)...
November 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29133045/synthesis-characterization-and-antileishmanial-activity-of-neutral-n-heterocyclic-carbenes-gold-i-complexes
#15
Chen Zhang, Sandra Bourgeade Delmas, Álvaro Fernández Álvarez, Alexis Valentin, Catherine Hemmert, Heinz Gornitzka
A series of five new mononuclear neutral gold(I) complexes containing N-heterocyclic carbenes (NHCs) was synthesized and fully characterized by spectroscopic methods. The X-ray structures of four complexes are presented. These gold(I) complexes together with four other neutral gold(I)-NHC complexes previously described were evaluated in vitro against Leishmania infantum promastigotes and axenic amastigotes. Moreover, their cytotoxicity was assessed on the murine macrophages J774A.1. Except one complex (10), eight gold(I)-NHC-Cl complexes show potent activity against the pathological relevant form of L...
October 24, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29128095/olive-oil-polyphenols-extracts-inhibit-inflammatory-markers-in-j774a-1-murine-macrophages-and-scavenge-free-radicals
#16
Marwa Abdallah, Stefania Marzocco, Simona Adesso, Mokhtar Zarrouk, Mokhtar Guerfel
Here we evaluate the olive oil antiradical and anti-inflammatory potential through its polyphenols extracts and examine the influence of olive maturity on olive oil quality properties, polyphenols composition and biological potentials. Samples have been obtained from minor Tunisian olive cultivars (Chemchali, Fouji and Zarrazi) at different maturity indices. Principal quality properties were evaluated and polyphenols analysis was carried out by Folin Ciocalteu reagent and HPLC-UV-MS. Antiradical activity was examined by DPPH and FRAP scavenging assays while J774A...
November 8, 2017: Acta Histochemica
https://www.readbyqxmd.com/read/29076425/cytotoxic-effects-and-production-of-cytokines-induced-by-the-endophytic-paenibacillus-polymyxa-rnc-d-in-vitro
#17
Débora Meira Neris, Genoveva Lourdes Flores Luna, Joice Margareth de Almeida Rodolpho, Ana Carolina Urbaczek, Ricardo de Oliveira Correia, Karina Alves Feitosa, Nadja Fernanda Gonzaga Serrano, Cristina Paiva de Sousa, Fernanda de Freitas Anibal
BACKGROUND: Prominent among all the organisms that have a potential value for the pro-duction of new medicines, are endophytes, fungi and bacteria that live inside plants without harming them. In this study, a total lyophilized extract (TLE) of Paenibacillus polymyxa RNC-D was used. The P. polymyxa lineages are known for their capacity to segregate a large number of extracellular enzymes and bioactive substances. METHODS: The TLE of Paenibacillus polymyxa RNC-D was tested in cell viability assays for cytotoxicity and cytokine production in BALB/3T3 and J774A...
October 26, 2017: Current Pharmaceutical Biotechnology
https://www.readbyqxmd.com/read/29042278/a-ribonuclease-inhibitor-resistant-dimer-of-human-pancreatic-ribonuclease-displays-specific-antitumor-activity
#18
Ayush Attery, Punyatirtha Dey, Prajna Tripathi, Janendra K Batra
Human pancreatic ribonuclease (HPR) and bovine seminal ribonuclease (BS-RNase) are members of the RNase A superfamily. HPR is monomeric, whereas BS-RNase is dimeric. BS-RNase has strong antitumor and cytotoxic activities. However, HPR lacks cytotoxic activity as it is inactivated by intracellular cytosolic ribonuclease inhibitor (RI). Earlier, an RI-resistant cytotoxic variant of HPR, termed HPR-KNE was generated which contained three residues Lys7, Asn71 and Glu111 of HPR, known to interact with RI, mutated to alanine...
October 16, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29033558/effect-of-surface-organic-coatings-of-cellulose-nanocrystals-on-the-viability-of-mammalian-cell-lines
#19
Ambar S Jimenez, Francesca Jaramillo, Usha D Hemraz, Yaman Boluk, Karina Ckless, Rajesh Sunasee
Cellulose nanocrystals (CNCs) have emerged as promising candidates for a number of bio-applications. Surface modification of CNCs continues to gain significant research interest as it imparts new properties to the surface of the nanocrystals for the design of multifunctional CNCs-based materials. A small chemical surface modification can potentially lead to drastic behavioral changes of cell-material interactions thereby affecting the intended bio-application. In this work, unmodified CNCs were covalently decorated with four different organic moieties such as a diaminobutane fragment, a cyclic oligosaccharide (β-cyclodextrin), a thermoresponsive polymer (poly[N-isopropylacrylamide]), and a cationic aminomethacrylamide-based polymer using different synthetic covalent methods...
2017: Nanotechnology, Science and Applications
https://www.readbyqxmd.com/read/29031243/preparation-and-evaluation-of-rifampicin-and-co-trimoxazole-loaded-nanocarrier-against-brucella-melitensis-infection
#20
Narges Bodaghabadi, Samira Hajigholami, Ziba Vaise Malekshahi, Maliheh Entezari, Farhood Najafi, Hadi Shirzad, Majid Sadeghizadeh
Background: Brucellosis or Malta fever is a contagious infection common between human and domestic animals. Many antibiotics are used for brucellosis treatment, but they are not efficient and put heavy burden on society. Co-trimoxazole and rifampicin are two candidates for brucellosis treatment. In this study, we aimed to enhance the efficacy of these antibiotics using designed nanoparticles. Methods: Different concentrations of co-trimoxazole and rifampicin were used for loading onto a nanostructure of synthesized monomethoxy poly(ethylene glycol)-oleate (mPEG-OA)...
October 15, 2017: Iranian Biomedical Journal
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