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https://www.readbyqxmd.com/read/27905270/gastrointestinal-helminth-fauna-of-rodents-from-cambodia-emphasizing-the-community-ecology-of-host-parasite-associations
#1
K Chaisiri, M Chou, C C Siew, S Morand, A Ribas
Extensive field surveys of rodents were conducted in Cambodia from 2008 to 2014 to study the diversity and ecology of helminth infection in wild rodent populations. Gastrointestinal helminths were isolated from 14 species of rodents (569 individuals) trapped from different habitats (forest, dry land, rain-fed land and human settlements) in four provinces of Cambodia (Krong Preah Sihanouk, Mondolkiri, Pursat and Steung Treng). The average prevalence of parasitic infection was 58.5% (range, 16.0-64.7%), and 19 helminth taxa were identified in total...
December 1, 2016: Journal of Helminthology
https://www.readbyqxmd.com/read/27902884/synthesis-and-biological-evaluation-of-new-triazolo-and-imidazolopyridine-ror%C3%AE-t-inverse-agonists
#2
Samuel Hintermann, Christine Guntermann, Henri Mattes, David A Carcache, Juergen Wagner, Anna Vulpetti, Andreas Billich, Janet Dawson, Klemens Kaupmann, Joerg Kallen, Rowan Stringer, David Orain
Retinoic-acid-related orphan receptor γt (RORγt) is a key transcription factor implicated in the production of pro-inflammatory Th17 cytokines, which drive a number of autoimmune diseases. Despite diverse chemical series having been reported, combining high potency with a good physicochemical profile has been a very challenging task in the RORγt inhibitor field. Based on available chemical structures and incorporating in-house knowledge, a new series of triazolo- and imidazopyridine RORγt inverse agonists was designed...
November 30, 2016: ChemMedChem
https://www.readbyqxmd.com/read/27884756/repeated-unpredictable-threats-without-harm-impair-spatial-working-memory-in-the-barnes-maze
#3
Diane J Kim, Nathan St Louis, Ralph A Molaro, Glenn T Hudson, Robert C Chorley, Brenda J Anderson
Psychological stressors elicit the anticipation of homeostatic challenge, whereas physical stressors are direct threats to homeostasis. Many rodent models of stress include both types of stressors, yet deficits, like those reported for working memory, are often attributed to psychological stress. To empirically test whether intermittent psychological stressors, such as repeated threats, are solely sufficient to impair spatial working memory, we developed a novel rodent model of stress that is restricted to the anticipation of threat, and free of direct physical challenge...
November 21, 2016: Neurobiology of Learning and Memory
https://www.readbyqxmd.com/read/27876672/is-there-a-human-health-risk-associated-with-indirect-exposure-to-perfluorinated-carboxylates-pfcas
#4
Amy A Rand, Scott A Mabury
The production and widespread use of poly- and perfluorinated alkyl substances (PFAS) has led to their presence in environment, wildlife, and humans. Particularly, the perfluorinated carboxylates (PFCAs) are pervasive throughout the world and have been found at ng/mL concentrations in human blood. PFCAs, especially those having longer carbon chain lengths (≥C6), are associated with developmental and hormonal effects, immunotoxicity, and promote tumor growth in rodents through their role as PPARα agonists...
November 19, 2016: Toxicology
https://www.readbyqxmd.com/read/27846311/cold-exposure-induces-proliferation-of-mature-brown-adipocyte-in-a-%C3%A3-3-adrenergic-receptor-mediated-pathway
#5
Keigo Fukano, Yuko Okamatsu-Ogura, Ayumi Tsubota, Junko Nio-Kobayashi, Kazuhiro Kimura
Hyperplasia of brown adipose tissue (BAT) is a fundamental mechanism for adaptation to survive in the cold environment in rodents. To determine which cell types comprising BAT contribute to tissue hyperplasia, immunohistochemical analysis using a proliferative marker Ki67 was performed on the BAT from 6-week-old C57BL/6J mice housed at 23°C (control) or 10°C (cold) for 5 days. Interestingly, in the control group, the cell proliferative marker Ki67 was detected in the nuclei of uncoupling protein 1-positive mature brown adipocytes (7...
2016: PloS One
https://www.readbyqxmd.com/read/27805583/repetitive-transcranial-magnetic-stimulation-to-the-unilateral-hemisphere-of-rat-brain
#6
Jaewon Beom, Jung Chan Lee, Jin Chul Paeng, Tai Ryoon Han, Moon Suk Bang, Byung-Mo Oh
Previous rodent models of repetitive transcranial magnetic stimulation (rTMS) adopted whole-brain stimulation instead of unilateral hemispheric rTMS, which is unlike the protocols used for human subjects. We report a successful application of rTMS to the unilateral hemisphere of rat brain. The rTMS was delivered with a low-frequency (1 Hz), high-frequency (20 Hz), or sham stimulation protocol to one side of the brain by using a small 25-mm figure-8 coil. We placed the center of the coil 1 cm lateral to the vertex on the biauricular line and angulated the coil 45° to the ground to minimize a potential direct effect of rTMS on the contralateral cortex...
October 22, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/27798305/global-population-divergence-and-admixture-of-the-brown-rat-rattus-norvegicus
#7
Emily E Puckett, Jane Park, Matthew Combs, Michael J Blum, Juliet E Bryant, Adalgisa Caccone, Federico Costa, Eva E Deinum, Alexandra Esther, Chelsea G Himsworth, Peter D Keightley, Albert Ko, Åke Lundkvist, Lorraine M McElhinney, Serge Morand, Judith Robins, James Russell, Tanja M Strand, Olga Suarez, Lisa Yon, Jason Munshi-South
Native to China and Mongolia, the brown rat (Rattus norvegicus) now enjoys a worldwide distribution. While black rats and the house mouse tracked the regional development of human agricultural settlements, brown rats did not appear in Europe until the 1500s, suggesting their range expansion was a response to relatively recent increases in global trade. We inferred the global phylogeography of brown rats using 32 k SNPs, and detected 13 evolutionary clusters within five expansion routes. One cluster arose following a southward expansion into Southeast Asia...
October 26, 2016: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/27788633/light-and-water-are-not-simple-conditions-fine-tuning-of-animal-housing-in-male-c57bl-6-mice
#8
Dominik Langgartner, Sandra Foertsch, Andrea M Füchsl, Stefan O Reber
While animal housing conditions are highly controlled and standardized between different laboratories, there are still many subtle differences that unavoidably influence the host organisms and, consequently, inter-laboratory reproducibility. Here, we investigated the physiological and immunological consequences between two light-dark cycle (LDC) lengths (14h/10h versus 12h/12h LDC) and two commonly used forms of drinking water (acidified drinking water (AW) versus normal tap water (NW)) in single-housed (SH) mice...
October 27, 2016: Stress: the International Journal on the Biology of Stress
https://www.readbyqxmd.com/read/27771383/maternal-separation-exacerbates-alzheimer-s-disease-like-behavioral-and-pathological-changes-in-adult-appswe-ps1de9-mice
#9
Jianjun Hui, Gaifeng Feng, Caifeng Zheng, Hui Jin, Ning Jia
Alzheimer's disease (AD), the most common neurodegenerative disorder that gradually destroys memory and cognitive abilities in the elderly, makes a huge emotional and economic burden on the patients and their families. The presence of senile plaques and the loss of cholinergic neurons in the brain are two neuropathological hallmarks of AD. Maternal separation (MS) is an animal paradigm designed to make early life stress. Studies on wild type rodents showed that MS could induce AD-like cognitive deficit and pathological changes...
October 19, 2016: Behavioural Brain Research
https://www.readbyqxmd.com/read/27763478/a-case-control-study-of-epidemiological-factors-associated-with-leptospirosis-in-south-gujarat-region
#10
K T Desai, F Patel, P B Patel, S Nayak, N B Patel, R K Bansal
BACKGROUND: The current study was planned to identify the epidemiological factors associated with leptospirosis in South Gujarat region using neighborhood controls. METHODS: A total of 100 cases of leptospirosis occurred in South Gujarat region during the year 2012 were selected using simple random sampling. Three neighbors of the selected cases formed the controls (n = 300). A pretested structured questionnaire was used for data collection and data were analyzed using Epi Info 2007...
October 2016: Journal of Postgraduate Medicine
https://www.readbyqxmd.com/read/27753639/impact-of-the-genetics-and-source-of-preclinical-safety-animal-models-on-study-design-results-and-interpretation
#11
Karyn Colman
It has been long established that not only the species but also the strain and supplier of rodents used in preclinical safety studies can have a significant impact on the outcome of studies due to variability in their genetic background and thus spontaneous pathologic findings. In addition, local husbandry, housing, and other environmental conditions may have effects on the development and expression of comorbidities, particularly in longer-term or chronic studies. More recently, similar effects related to the source, including genetic and environmental variability, have been recognized in cynomolgus macaques (Macaca fascicularis)...
October 17, 2016: Toxicologic Pathology
https://www.readbyqxmd.com/read/27740964/beneficial-effects-of-chronic-oxytocin-administration-and-social-co-housing-in-a-rodent-model-of-post-traumatic-stress-disorder
#12
Eric M Janezic, Swetha Uppalapati, Stephanie Nagl, Marco Contreras, Edward D French, Jean-Marc Fellous
Post-traumatic stress disorder (PTSD) is in part due to a deficit in memory consolidation and extinction. Oxytocin (OXT) has anxiolytic effects and promotes prosocial behaviors in both rodents and humans, and evidence suggests that it plays a role in memory consolidation. We studied the effects of administered OXT and social co-housing in a rodent model of PTSD. Acute OXT yielded a short-term increase in the recall of the traumatic memory if administered immediately after trauma. Low doses of OXT delivered chronically had a cumulating anxiolytic effect that became apparent after 4 days and persisted...
October 12, 2016: Behavioural Pharmacology
https://www.readbyqxmd.com/read/27734334/limited-effects-of-prolonged-environmental-enrichment-on-the-pathology-of-5xfad-mice
#13
Melanie Hüttenrauch, Susanne Walter, Margie Kaufmann, Sascha Weggen, Oliver Wirths
The environmental enrichment (EE) paradigm is regarded as a useful tool to create a physical and intellectual stimulation for laboratory rodents and has been used in a variety of Alzheimer disease (AD) mouse models. However, the results of these studies have been conflicting as EE had inconsistent effects on memory performance, Aβ deposition, inflammatory status and other pathological outcomes depending on the AD model. Here, we studied the influence of a lifelong EE on the widely used 5XFAD mouse model, representing the main pathological features of AD...
October 12, 2016: Molecular Neurobiology
https://www.readbyqxmd.com/read/27714514/hippocampal-glua2-and-glua4-protein-but-not-corresponding-mrna-and-promoter-methylation-levels-are-modulated-at-retrieval-in-spatial-learning-of-the-rat
#14
Birgit Rössner, Maximilian Klingler, Tanja Bulat, Ajinkya Sase, Andrea Zeilinger, Melanie Spitzwieser, Jana Aradska, Margit Cichna-Markl, Gert Lubec
AMPA receptors mediate most fast excitatory synaptic transmission in the brain. Highly dynamic AMPA receptors are subjected to trafficking, recycling, and/or degradation and replacement. Changes in AMPA receptor abundance is an important mechanism involved in learning and memory formation. Results obtained with the Morris water maze (MWM), a paradigm for testing spatial memory in rodent, correlate with hippocampal synaptic plasticity and NMDA function. Different phases of spatial learning like acquisition and retrieval involve AMPA receptors...
October 6, 2016: Amino Acids
https://www.readbyqxmd.com/read/27693391/replacement-of-serum-with-ocular-fluid-for-cryopreservation-of-immature-testes
#15
Lavanya Pothana, Lalitha Devi, Naresh Kumar Venna, Niharika Pentakota, Vivek Phani Varma, Jedy Jose, Sandeep Goel
Cryopreservation of immature testis is a feasible approach for germplasm preservation of male animals. Combinations of dimethyl sulfoxide (DMSO) and foetal bovine serum (FBS) are used for testis cryopreservation. However, an alternative to FBS is needed, because FBS is expensive. Buffalo ocular fluid (BuOF), a slaughter house by-product, could be an economical option. The objective of the present study was to assess whether BuOF can replace FBS for cryopreservation of immature mouse (Mus musculus), rat (Rattus norvegicus), and buffalo (Bubalus bubalis) testes...
September 28, 2016: Cryobiology
https://www.readbyqxmd.com/read/27670366/parasites-and-invasions-changes-in-gastrointestinal-helminth-assemblages-in-invasive-and-native-rodents-in-senegal
#16
Christophe Diagne, Alexis Ribas, Nathalie Charbonnel, Ambroise Dalecky, Caroline Tatard, Philippe Gauthier, Voitto Haukisalmi, Odile Fossati-Gaschignard, Khalilou Bâ, Mamadou Kane, Youssoupha Niang, Mamoudou Diallo, Aliou Sow, Sylvain Piry, Mbacké Sembène, Carine Brouat
Understanding why some exotic species become widespread and abundant in their colonised range is a fundamental issue that still needs to be addressed. Among many hypotheses, newly established host populations may benefit from a parasite loss ("enemy release" hypothesis) through impoverishment of their original parasite communities or reduced infection levels. Moreover, the fitness of competing native hosts may be negatively affected by the acquisition of exotic taxa from invaders ("parasite spillover") and/or by an increased transmission risk of native parasites due to their amplification by invaders ("parasite spillback")...
December 2016: International Journal for Parasitology
https://www.readbyqxmd.com/read/27663719/comparative-genome-and-evolutionary-analysis-of-naturally-occurring-beilong-virus-in-brown-and-black-rats
#17
Patrick C Y Woo, Annette Y P Wong, Beatrice H L Wong, Carol S F Lam, Rachel Y Y Fan, Susanna K P Lau, Kwok-Yung Yuen
Recently, we reported the presence of Beilong virus in spleen and kidney samples of brown rats and black rats, suggesting that these rodents could be natural reservoirs of Beilong virus. In this study, four genomes of Beilong virus from brown rats and black rats were sequenced. Similar to the Beilong virus genome sequenced from kidney mesangial cell line culture, those of J-virus from house mouse and Tailam virus from Sikkim rats, these four genomes from naturally occurring Beilong virus also contain the eight genes (3'-N-P/V/C-M-F-SH-TM-G-L-5')...
September 20, 2016: Infection, Genetics and Evolution
https://www.readbyqxmd.com/read/27612942/%C3%AE-catenin-signaling-positively-regulates-glutamate-uptake-and-metabolism-in-astrocytes
#18
Victoria Lutgen, Srinivas D Narasipura, Amit Sharma, Stephanie Min, Lena Al-Harthi
BACKGROUND: Neurological disorders have been linked to abnormal excitatory neurotransmission. Perturbations in glutamate cycling can have profound impacts on normal activity, lead to excitotoxicity and neuroinflammation, and induce and/or exacerbate impairments in these diseases. Astrocytes play a key role in excitatory signaling as they both clear glutamate from the synaptic cleft and house enzymes responsible for glutamate conversion to glutamine. However, mechanisms responsible for the regulation of glutamate cycling, including the main astrocytic glutamate transporter excitatory amino acid transporter 2 (EAAT2 or GLT-1 in rodents) and glutamine synthetase (GS) which catalyzes the ATP-dependent reaction of glutamate and ammonia into glutamine, remain largely undefined...
September 10, 2016: Journal of Neuroinflammation
https://www.readbyqxmd.com/read/27607352/titanium-wound-chambers-for-wound-healing-research
#19
Kristo Nuutila, Mansher Singh, Carla Kruse, Justin Philip, Edward J Caterson, Elof Eriksson
Standardized and reproducible animal models are crucial in medical research. Rodents are commonly used in wound healing studies since, they are easily available, affordable and simple to handle and house. However, the most significant limitation of rodent models is that the wounds heal by contraction while in humans the primary mechanisms of healing are reepithelialization and granulation tissue formation. The robust contraction results in faster wound closure that complicates the reproducibility of rodent studies in clinical trials...
September 8, 2016: Wound Repair and Regeneration
https://www.readbyqxmd.com/read/27597545/impact-of-exercise-and-a-complex-environment-on-hippocampal-dendritic-morphology-bdnf-gene-expression-and-dna-methylation-in-male-rat-pups-neonatally-exposed-to-alcohol
#20
K E Boschen, S E McKeown, T L Roth, A Y Klintsova
Alcohol exposure in utero can result in Fetal Alcohol Spectrums Disorders (FASD). Measures of hippocampal neuroplasticity, including long-term potentiation, synaptic and dendritic organization, and adult neurogenesis, are consistently disrupted in rodent models of FASD. The current study investigated whether third trimester-equivalent binge-like alcohol exposure (AE) [postnatal days (PD) 4-9] affects dendritic morphology of immature dentate gyrus granule cells, and brain-derived neurotrophic factor (Bdnf) gene expression and DNA methylation in hippocampal tissue in adult male rats...
September 6, 2016: Developmental Neurobiology
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