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https://www.readbyqxmd.com/read/28749750/microbial-offense-vs-host-defense-who-controls-the-tb-granuloma
#1
Amanda J Martinot
The granuloma is the hallmark of tuberculosis and simultaneously signifies acquisition of an infection and induction of a host immune response. But who benefits more from the development of the granuloma, the host or the pathogen? Is microbe or man dictating disease course and progression? Mycobacterial diseases affect humans and animals alike, and the concepts presented in this review reflect host-pathogen interactions that influence not only mycobacterial granulomas in humans and animals but also other infectious granulomatous diseases that are encountered in veterinary medicine...
January 1, 2017: Veterinary Pathology
https://www.readbyqxmd.com/read/28748730/therapeutic-targeting-of-leukemic-stem-cells-in-acute-myeloid-leukemia-the-biological-background-for-possible-strategies
#2
Øystein Bruserud, Elise Aasebø, Maria Hernandez-Valladares, Galina Tsykunova, Håkon Reikvam
Acute myeloid leukemia (AML) is an aggressive malignancy, caused by the accumulation of immature leukemic blasts in blood and bone marrow. There is a relatively high risk of chemoresistant relapse even for the younger patients who can receive the most intensive antileukemic treatment. Treatment directed against the remaining leukemic and preleukemic stem cells will most likely reduce the risk of later relapse. Areas covered: Relevant publications were identified through literature searches. The authors searched for original articles and recent reviews describing (i) the characteristics of leukemic/preleukemic stem cells; (ii) the importance of the bone marrow stem cell niches in leukemogenesis; and (iii) possible therapeutic strategies to target the preleukemic/leukemic stem cells...
July 27, 2017: Expert Opinion on Drug Discovery
https://www.readbyqxmd.com/read/28748565/evaluating-mechanisms-of-diversification-in-a-guineo-congolian-tropical-forest-frog-using-demographic-model-selection
#3
Daniel M Portik, Adam D Leaché, Danielle Rivera, Michael F Barej, Marius Burger, Mareike Hirschfeld, Mark-Oliver Rödel, David C Blackburn, Matthew K Fujita
The accumulation of biodiversity in tropical forests can occur through multiple allopatric and parapatric models of diversification, including forest refugia, riverine barriers, and ecological gradients. Considerable debate surrounds the major diversification process, particularly in the West African Lower Guinea forests, which contain a complex geographic arrangement of topographic features and historical refugia. We used genomic data to investigate alternative mechanisms of diversification in the Gaboon forest frog, Scotobleps gabonicus, by first identifying population structure and then performing demographic model selection and spatially explicit analyses...
July 27, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28747815/identification-of-very-small-open-reading-frames-in-the-genomes-of-holmes-jungle-virus-ord-river-virus-and-wongabel-virus-of-the-genus-hapavirus-family-rhabdoviridae
#4
REVIEW
Aneta Gubala, Susan Walsh, Jane McAllister, Richard Weir, Steven Davis, Lorna Melville, Ian Mitchell, Dieter Bulach, Penny Gauci, Alex Skvortsov, David Boyle
Viruses of the family Rhabdoviridae infect a broad range of hosts from a variety of ecological and geographical niches, including vertebrates, arthropods, and plants. The arthropod-transmitted members of this family display considerable genetic diversity and remarkable genomic flexibility that enable coding for various accessory proteins in different locations of the genome. Here, we describe the genome of Holmes Jungle virus, isolated from Culex annulirostris mosquitoes collected in northern Australia, and make detailed comparisons with the closely related Ord River and Wongabel viruses, with a focus on identifying very small open reading frames (smORFs) in their genomes...
2017: Evolutionary Bioinformatics Online
https://www.readbyqxmd.com/read/28747689/niches-and-interspecific-associations-of-dominant-populations-in-three-changed-stages-of-natural-secondary-forests-on-loess-plateau-p-r-china
#5
Li Gu, Zhi-Wen Gong, Wei-Zhong Li
Ecological niches remain central to explaining community structure, and niche-based studies have helped us to better understand species interactions, distributions, coexistence and associated mechanisms. Quercus wutaishansea populations on Loess Plateau are currently expanding their dominance in natural secondary forest types. In the present paper, we focused on the dynamic changes of niches and interspecific association among different changed stages. The overall interspecies association of the three communities exhibited positive association for Variance Ratio (VR) >1; the value of χ(2) significance test further revealed that the overall association had reached the level of significant association...
July 26, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28747587/distribution-of-diverse-escherichia-coli-between-cattle-and-pasture
#6
Gitanjali NandaKafle, Tarren Seale, Toby Flint, Madhav Nepal, Stephanus N Venter, Volker S Brözel
Escherichia coli is widely considered to not survive for extended periods outside the intestines of warm-blooded animals; however, recent studies demonstrated that E. coli strains maintain populations in soil and water without any known fecal contamination. The objective of this study was to investigate whether the niche partitioning of E. coli occurs between cattle and their pasture. We attempted to clarify whether E. coli from bovine feces differs phenotypically and genotypically from isolates maintaining a population in pasture soil over winter...
July 27, 2017: Microbes and Environments
https://www.readbyqxmd.com/read/28747514/mechanoresponsive-stem-cells-to-target-cancer-metastases-through-biophysical-cues
#7
Linan Liu, Shirley X Zhang, Wenbin Liao, Henry P Farhoodi, Chi W Wong, Claire C Chen, Aude I Ségaliny, Jenu V Chacko, Lily P Nguyen, Mengrou Lu, George Polovin, Egest J Pone, Timothy L Downing, Devon A Lawson, Michelle A Digman, Weian Zhao
Despite decades of effort, little progress has been made to improve the treatment of cancer metastases. To leverage the central role of the mechanoenvironment in cancer metastasis, we present a mechanoresponsive cell system (MRCS) to selectively identify and treat cancer metastases by targeting the specific biophysical cues in the tumor niche in vivo. Our MRCS uses mechanosensitive promoter-driven mesenchymal stem cell (MSC)-based vectors, which selectively home to and target cancer metastases in response to specific mechanical cues to deliver therapeutics to effectively kill cancer cells, as demonstrated in a metastatic breast cancer mouse model...
July 26, 2017: Science Translational Medicine
https://www.readbyqxmd.com/read/28747480/effects-of-age-and-reproductive-status-on-individual-foraging-site-fidelity-in-a-long-lived-marine-predator
#8
Stephen C Votier, Annette L Fayet, Stuart Bearhop, Thomas W Bodey, Bethany L Clark, James Grecian, Tim Guilford, Keith C Hamer, Jana W E Jeglinski, Greg Morgan, Ewan Wakefield, Samantha C Patrick
Individual foraging specializations, where individuals use a small component of the population niche width, are widespread in nature with important ecological and evolutionary implications. In long-lived animals, foraging ability develops with age, but we know little about the ontogeny of individuality in foraging. Here we use precision global positioning system (GPS) loggers to examine how individual foraging site fidelity (IFSF), a common component of foraging specialization, varies between breeders, failed breeders and immatures in a long-lived marine predator-the northern gannet Morus bassanus Breeders (aged 5+) showed strong IFSF: they had similar routes and were faithful to distal points during successive trips...
July 26, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28746735/early-transcriptional-response-pathways-in-daphnia-magna-are-coordinated-in-networks-of-crustacean-specific-genes
#9
Luisa Orsini, James B Brown, Omid Shams Solari, Dong Li, Shan He, Ram Podicheti, Marcus H Stoiber, Katina I Spanier, Donald Gilbert, Mieke Jansen, Douglas Rusch, Michael E Pfrender, John K Colbourne, Mikko J Frilander, Jouni Kvist, Ellen Decaestecker, Karel A C De Schamphelaere, Luc De Meester
Natural habitats are exposed to an increasing number of environmental stressors that cause important ecological consequences. However, the multifarious nature of environmental change, the strength and the relative timing of each stressor largely limit our understanding of biological responses to environmental change. In particular early response to unpredictable environmental change, critical to survival and fitness in later life stages, is largely uncharacterized. Here, we characterize the early transcriptional response of the keystone species Daphnia magna to twelve environmental perturbations, including biotic and abiotic stressors...
July 26, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28745094/nich-at-its-best-for-diabetes-at-its-worst-texting-teens-and-their-caregivers-for-better-outcomes
#10
David V Wagner, Samantha A Barry, Maggie Stoeckel, Lena Teplitsky, Michael A Harris
BACKGROUND: There is growing evidence for the feasibility of text-based interventions for pediatric patients with type 1 diabetes (T1D). However, less is known regarding whether the use of personalized text messages with high-risk youth and their caregivers is associated with improvements in youth health. This study examines the use of diabetes-specific texts and associated health outcomes for participants of the Novel Interventions in Children's Healthcare (NICH) program. METHODS: Text messages sent to youth with T1D and their caregivers during NICH intervention were coded regarding diabetes relevance and adherence-related content...
May 2017: Journal of Diabetes Science and Technology
https://www.readbyqxmd.com/read/28744860/echinocandins-in-antifungal-pharmacotherapy
#11
REVIEW
Akash Patil, Soumyajit Majumdar
OBJECTIVES: Echinocandins are the newest addition of the last decade to the antifungal armamentarium, which, owing to their unique mechanism of action, selectively target the fungal cells without affecting mammalian cells. Since the time of their introduction, they have come to occupy an important niche in the antifungal pharmacotherapy, due to their efficacy, safety, tolerability and favourable pharmacokinetic profiles. This review deals with the varying facets of echinocandins such as their chemistry, in-vitro and in-vivo evaluations, clinical utility and indications, pharmacokinetic and pharmacodynamic profiles, and pharmacoeconomic considerations...
July 26, 2017: Journal of Pharmacy and Pharmacology
https://www.readbyqxmd.com/read/28744786/genetic-basis-of-exploiting-ecological-opportunity-during-the-long-term-diversification-of-a-bacterial-population
#12
Jessika Consuegra, Jessica Plucain, Joël Gaffé, Thomas Hindré, Dominique Schneider
Adaptive diversification is an essential evolutionary process, one that produces phenotypic innovations including the colonization of available ecological niches. Bacteria can diverge in sympatry when ecological opportunities allow, but the underlying genetic mechanisms are often unknown. Perhaps, the longest-lasting adaptive diversification seen in the laboratory occurred during the long-term evolution experiment, in which 12 populations of Escherichia coli have been evolving independently for more than 65,000 generations from a common ancestor...
July 25, 2017: Journal of Molecular Evolution
https://www.readbyqxmd.com/read/28744322/visualization-of-tumor-immune-interaction-target-specific-imaging-of-s100a8-a9-reveals-pre-metastatic-niche-establishment
#13
Michel Eisenblaetter, Fabian Flores-Borja, Jae Jin Lee, Christina Wefers, Hannah Smith, Rebekka Hueting, Margaret S Cooper, Philip J Blower, Dominic Patel, Manuel Rodriguez-Justo, Hanna Milewicz, Thomas Vogl, Johannes Roth, Andrew Tutt, Tobias Schaeffter, Tony Ng
Background Systemic cancer spread is preceded by the establishment of a permissive microenvironment in the target tissue of metastasis - the premetastatic niche. As crucial players in establishment of the pre-metastatic niche, myeloid derived suppressor cells (MDSC) release S100A8/A9, an exosomal protein that contributes to metastasis, angiogenesis, and immune suppression. We report the application of antibody-based single-photon emission computed tomography (SPECT) for detection of S100A8/A9 in vivo as an imaging marker for pre-metastatic tissue priming...
2017: Theranostics
https://www.readbyqxmd.com/read/28744269/comparative-genomics-of-methanopyrus-sp-snp6-and-kol6-revealing-genomic-regions-of-plasticity-implicated-in-extremely-thermophilic-profiles
#14
Zhiliang Yu, Yunting Ma, Weihong Zhong, Juanping Qiu, Jun Li
Methanopyrus spp. are usually isolated from harsh niches, such as high osmotic pressure and extreme temperature. However, the molecular mechanisms for their environmental adaption are poorly understood. Archaeal species is commonly considered as primitive organism. The evolutional placement of archaea is a fundamental and intriguing scientific question. We sequenced the genomes of Methanopyrus strains SNP6 and KOL6 isolated from the Atlantic and Iceland, respectively. Comparative genomic analysis revealed genetic diversity and instability implicated in niche adaption, including a number of transporter- and integrase/transposase-related genes...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28744010/the-jak2v617f-bearing-vascular-niche-promotes-clonal-expansion-in-myeloproliferative-neoplasms
#15
H Zhan, C H S Lin, Y Segal, K Kaushansky
The acquired kinase mutation JAK2V617F plays a central role in myeloproliferative neoplasms (MPNs). However, the mechanisms responsible for the malignant hematopoietic stem/progenitor cell (HSPC) expansion seen in patients with MPNs are not fully understood, limiting the effectiveness of current treatment. Endothelial cells (ECs) are an essential component of the hematopoietic niche, and they have been shown to express the JAK2V617F mutation in patients with MPNs. We show that the JAK2V617F-bearing vascular niche promotes the expansion of the JAK2V617F HSPCs in preference to JAK2WT HSPCs, potentially contributing to poor donor cell engraftment and disease relapse following stem cell transplantation...
July 24, 2017: Leukemia: Official Journal of the Leukemia Society of America, Leukemia Research Fund, U.K
https://www.readbyqxmd.com/read/28743899/thrombopoiesis-is-spatially-regulated-by-the-bone-marrow-vasculature
#16
David Stegner, Judith M M vanEeuwijk, Oğuzhan Angay, Maximilian G Gorelashvili, Daniela Semeniak, Jürgen Pinnecker, Patrick Schmithausen, Imke Meyer, Mike Friedrich, Sebastian Dütting, Christian Brede, Andreas Beilhack, Harald Schulze, Bernhard Nieswandt, Katrin G Heinze
In mammals, megakaryocytes (MKs) in the bone marrow (BM) produce blood platelets, required for hemostasis and thrombosis. MKs originate from hematopoietic stem cells and are thought to migrate from an endosteal niche towards the vascular sinusoids during their maturation. Through imaging of MKs in the intact BM, here we show that MKs can be found within the entire BM, without a bias towards bone-distant regions. By combining in vivo two-photon microscopy and in situ light-sheet fluorescence microscopy with computational simulations, we reveal surprisingly slow MK migration, limited intervascular space, and a vessel-biased MK pool...
July 25, 2017: Nature Communications
https://www.readbyqxmd.com/read/28743859/let-7-microrna-dependent-control-of-leukotriene-signaling-regulates-the-transition-of-hematopoietic-niche-in-mice
#17
Xuan Jiang, John S Hawkins, Jerry Lee, Carlos O Lizama, Frank L Bos, Joan P Zape, Prajakta Ghatpande, Yongbo Peng, Justin Louie, Giorgio Lagna, Ann C Zovein, Akiko Hata
Hematopoietic stem and progenitor cells arise from the vascular endothelium of the dorsal aorta and subsequently switch niche to the fetal liver through unknown mechanisms. Here we report that vascular endothelium-specific deletion of mouse Drosha (Drosha (cKO)), an enzyme essential for microRNA biogenesis, leads to anemia and death. A similar number of hematopoietic stem and progenitor cells emerge from Drosha-deficient and control vascular endothelium, but Drosha (cKO)-derived hematopoietic stem and progenitor cells accumulate in the dorsal aorta and fail to colonize the fetal liver...
July 25, 2017: Nature Communications
https://www.readbyqxmd.com/read/28743783/rethinking-the-nonprofit-foundation-an-emerging-niche-in-the-rare-disease-ecosystem
#18
Annette C Bakker, Salvatore La Rosa
No abstract text is available yet for this article.
July 25, 2017: EMBO Molecular Medicine
https://www.readbyqxmd.com/read/28743634/early-ciliary-and-prominin-1-dysfunctions-precede-neurogenesis-impairment-in-a-mouse-model-of-type-2-diabetes
#19
Tomás P Bachor, Jana Karbanová, Edgar Büttner, Vicente Bermúdez, Melisa Marquioni Ramella, Peter Carmeliet, Denis Corbeil, Angela M Suburo
Diabetes mellitus (DM) is reaching epidemic conditions worldwide and increases the risk for cognition impairment and dementia. Here, we postulated that progenitors in adult neurogenic niches might be particularly vulnerable. Therefore, we evaluated the different components of the mouse subventricular zone (SVZ) during the first week after chemical induction of type 1 and type 2 diabetes-like (T1DM and T2DM) conditions. Surprisingly, only T2DM mice showed SVZ damage. The initial lesions were localized to ependymal cilia, which appeared disorientated and clumped together...
July 22, 2017: Neurobiology of Disease
https://www.readbyqxmd.com/read/28743531/metabolic-regulation-of-glioma-stem-like-cells-in-the-tumor-micro-environment
#20
Tom M Thomas, John S Yu
Cancer metabolism has emerged as one of the most interesting old ideas being revisited from a new perspective. In the early 20(th) century Otto Warburg declared metabolism the prime cause in a disease of many secondary causes, and this statement seems more prescient in view of modern expositions into the true nature of tumor evolution. As the complexity of tumor heterogeneity becomes more clear from a genetic perspective, it is important to consider the inevitably heterogeneous metabolic components of the tumor and the tumor microenvironment...
July 22, 2017: Cancer Letters
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