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https://www.readbyqxmd.com/read/28241401/hippocampal-cortical-contributions-to-strategic-exploration-during-perceptual-discrimination
#1
Joel L Voss, Neal J Cohen
The hippocampus is crucial for long-term memory; its involvement in short-term or immediate expressions of memory is more controversial. Rodent hippocampus has been implicated in an expression of memory that occurs on-line during exploration termed "vicarious trial-and-error" (VTE) behavior. VTE occurs when rodents iteratively explore options during perceptual discrimination or at choice points. It is strategic in that it accelerates learning and improves later memory. VTE has been associated with activity of rodent hippocampal neurons, and lesions of hippocampus disrupt VTE and associated learning and memory advantages...
February 27, 2017: Hippocampus
https://www.readbyqxmd.com/read/28241007/gaze-informed-task-situated-representation-of-space-in-primate-hippocampus-during-virtual-navigation
#2
Sylvia Wirth, Pierre Baraduc, Aurélie Planté, Serge Pinède, Jean-René Duhamel
To elucidate how gaze informs the construction of mental space during wayfinding in visual species like primates, we jointly examined navigation behavior, visual exploration, and hippocampal activity as macaque monkeys searched a virtual reality maze for a reward. Cells sensitive to place also responded to one or more variables like head direction, point of gaze, or task context. Many cells fired at the sight (and in anticipation) of a single landmark in a viewpoint- or task-dependent manner, simultaneously encoding the animal's logical situation within a set of actions leading to the goal...
February 2017: PLoS Biology
https://www.readbyqxmd.com/read/28240815/antimicrobial-and-immunomodulatory-surface-functionalized-electrospun-membranes-for-bone-regeneration
#3
Asha Mathew, Cedryck Vaquette, Saeed Hashimi, Irani Rathnayake, Flavia Huygens, Dietmar W Hutmacher, Saso Ivanovski
Guided bone regeneration (GBR) is a surgical procedure utilizing occlusive membranes for providing space maintenance and enabling selective repopulation of the damaged area. While this technique is effective in regenerating bone, bacterial infiltration occurs frequently and can compromise the regenerative outcome. In this study, the authors describe the development and characterization of a GBR membrane made of medical grade polycaprolactone (mPCL) electrospun fibers with antibacterial and immunomodulatory properties...
February 27, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28240768/trpm8-mediates-the-anti-inflammatory-effects-of-eucalyptol
#4
Ana I Caceres, Boyi Liu, Sairam Jabba, Satyanarayana Achanta, John B Morris, Sven-Eric Jordt
BACKGROUND AND PURPOSE: Eucalyptol (1,8-cineol), the major ingredient in the essential oil of the eucalyptus leaves and other medicinal plants, has long been known for its anti-inflammatory properties. Eucalyptol interacts with Transient Receptor Potential (TRP) ion channels among other targets, but it is unclear which of these mediates its anti-inflammatory effects. EXPERIMENTAL APPROACH: The effects of eucalyptol were compared in wild-type and TRPM8-deficient mice in two different models: Footpad inflammation elicited by Complete Freund's Adjuvant (CFA) and pulmonary inflammation following administration of lipopolysaccharide (LPS)...
February 27, 2017: British Journal of Pharmacology
https://www.readbyqxmd.com/read/28240351/a-time-to-listen-perinatal-smoking-affects-the-development-of-temporal-sound-processing
#5
Barbara J Morley, Richard A Felix
It has been known for more than 30 years that the α7 nicotinic acetylcholine receptor (nAChR) is widely expressed in the mammalian brain and is very heavily expressed in the auditory brainstem, where it is developmentally regulated. Peak expression usually occurs at about postnatal day 10 (P10) in rodents, coincident with the maturation of glutamatergic excitatory synapses. The importance of the developmental regulation and the association with excitatory synapses, however, has remained elusive. This article is protected by copyright...
February 27, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28240292/the-role-of-dorsal-hippocampal-dopamine-d1-type-receptors-in-social-learning-social-interactions-and-food-intake-in-male-and-female-mice
#6
Richard Matta, Angela Nicole Tiessen, Elena Choleris
The neurobiological mechanisms underlying social learning (ie, in which an animals learning is influenced by another) are slowly being unraveled. Previous work with systemic treatments shows that dopamine (DA) D1-type receptors mediate social learning in the social transmission of food preferences (STFP) in mice (Choleris et al, 2011). This study examines the involvement of one brain region underlying this effect. The ventral tegmental area has dopaminergic projections to many limbic structures, including the hippocampus-a site important for social learning in the STFP in rodents...
February 27, 2017: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28240194/brain-and-gut-crf-signaling-biological-actions-and-role-in-the-gastrointestinal-tract
#7
Million Mulugeta, Yvette Taché, Muriel Larauche, Pu-Qing Yuan
Corticotropin-releasing factor (CRF) signaling pathways coordinate the behavioral, endocrine, autonomic and visceral responses to stress. Convergent anatomical, molecular, pharmacological and functional experimental evidence supports an important role of brain CRF receptor signaling in stress-related alterations of gastrointestinal functions. These include the inhibition of gastric acid secretion and gastro-small intestinal transit, the stimulation of colonic enteric nervous system and secretory-motor function, enhanced intestinal permeability, and visceral hypersensitivity...
February 23, 2017: Current Molecular Pharmacology
https://www.readbyqxmd.com/read/28239653/the-human-brain-produces-fructose-from-glucose
#8
Janice J Hwang, Lihong Jiang, Muhammad Hamza, Feng Dai, Renata Belfort-DeAguiar, Gary Cline, Douglas L Rothman, Graeme Mason, Robert S Sherwin
Fructose has been implicated in the pathogenesis of obesity and type 2 diabetes. In contrast to glucose, CNS delivery of fructose in rodents promotes feeding behavior. However, because circulating plasma fructose levels are exceedingly low, it remains unclear to what extent fructose crosses the blood-brain barrier to exert CNS effects. To determine whether fructose can be endogenously generated from glucose via the polyol pathway (glucose → sorbitol → fructose) in human brain, 8 healthy subjects (4 women/4 men; age, 28...
February 23, 2017: JCI Insight
https://www.readbyqxmd.com/read/28239611/pleotropic-acute-and-chronic-effects-of-leptin-to-reverse-type-1-diabetes
#9
Rachel J Perry
Recent studies have demonstrated that leptin can prolong life chronically in rats with poorly-controlled type 1 diabetes (T1D). Multiple explanations have been proposed to explain leptin's chronic antihyperglycemic effect, including suppression of glucagon release and/or signaling, reductions in hyperphagia and ectopic lipid content, and improvements in insulin sensitivity; it is leptin's ability to reduce plasma glucose relies on all of these effects. In addition, leptin reverses hyperglycemia and diabetic ketoacidosis (DKA) acutely, within 6 hours of leptin infusion, by suppressing hypothalamic-pituitary-adrenal (HPA) axis activity in insulinopenic rats...
January 2017: Postdoc Journal: a Journal of Postdoctoral Research and Postdoctoral Affairs
https://www.readbyqxmd.com/read/28239559/gene-profiling-the-window-of-implantation-microarray-analyses-from-human-and-rodent-models
#10
Jennifer L Herington, Yan Guo, Jeff Reese, Bibhash C Paria
Poor uterine receptivity leads to implantation defects or failure. Identification of uterine molecules crucial to uterine receptivity and/or embryo implantation provides the opportunity to design a diagnostic screening toolkit for uterine receptivity or targeted drug discovery for treating implantation-based infertility. In this regard, gene-profiling studies performed in humans and rodents have identified numerous genes involved in the transcriptional regulation of uterine receptivity and embryo implantation...
December 2016: J Reprod Health Med
https://www.readbyqxmd.com/read/28238950/an-improved-rodent-model-of-trigeminal-neuropathic-pain-by-unilateral-chronic-constriction-injury-of-distal-infraorbital-nerve-dion-cci
#11
Weihua Ding, Zerong You, Shiqian Shen, Jinsheng Yang, Grewo Lim, Jason T Doheny, Lucy Chen, Shengmei Zhu, Jianren Mao
: The number of studies on trigeminal nerve injury using animal models remains limited. A rodent model of trigeminal neuropathic pain was first developed in the 1994, in which chronic constriction injury is induced by ligation of the infraorbital nerve (IoN-CCI). This animal model has served as a major tool to study trigeminal neuropathic pain. Unfortunately, the surgical procedure in this model is complicated and far more difficult than ligation of peripheral nerves (e.g. sciatic nerve)...
February 23, 2017: Journal of Pain: Official Journal of the American Pain Society
https://www.readbyqxmd.com/read/28238932/mono-2-ethylhexyl-phthalate-induced-sertoli-cell-injury-stimulates-the-production-of-pro-inflammatory-cytokines-in-fisher-344-rats
#12
Angela R Stermer, Caitlin J Murphy, Rashin Ghaffari, Kristin R Di Bona, Jorine J Voss, John H Richburg
Exposure of rodents to the Sertoli cell (SC) toxicant mono-(2-ethylhexyl) phthalate (MEHP) has been reported to trigger an infiltration of macrophages into the testis in an age- and species-dependent manner. Here we challenge the hypothesis that the peripubertal rat-specific infiltration of macrophages after MEHP exposure is due, in part, to an increase in SC-specific inflammatory cytokine expression. To rule out that GC apoptosis itself is responsible for macrophage recruitment, rats were exposed to a direct germ cell toxicant, methoxy acetic acid (MAA), but no infiltration of macrophages was observed...
February 23, 2017: Reproductive Toxicology
https://www.readbyqxmd.com/read/28238851/cellular-responses-to-recurrent-pentylenetetrazole-induced-seizures-in-the-adult-zebrafish-brain
#13
Phan Q Duy, Michael A Berberoglu, Christine E Beattie, Charles W Hall
A seizure is a sustained increase in brain electrical activity that can result in loss of consciousness and injury. Understanding how the brain responds to seizures is important for development of new treatment strategies for epilepsy, a neurological condition characterized by recurrent and unprovoked seizures. Pharmacological induction of seizures in rodent models results in a myriad of cellular alterations, including inflammation, angiogenesis, and adult neurogenesis. The purpose of this study is to investigate the cellular responses to recurrent pentylenetetrazole seizures in the adult zebrafish brain...
February 23, 2017: Neuroscience
https://www.readbyqxmd.com/read/28238201/advances-in-optogenetic-and-chemogenetic-methods-to-study-brain-circuits-in-non-human-primates
#14
REVIEW
Adriana Galvan, Michael J Caiola, Daniel L Albaugh
Over the last 10 years, the use of opto- and chemogenetics to modulate neuronal activity in research applications has increased exponentially. Both techniques involve the genetic delivery of artificial proteins (opsins or engineered receptors) that are expressed on a selective population of neurons. The firing of these neurons can then be manipulated using light sources (for opsins) or by systemic administration of exogenous compounds (for chemogenetic receptors). Opto- and chemogenetic tools have enabled many important advances in basal ganglia research in rodent models, yet these techniques have faced a slow progress in non-human primate (NHP) research...
February 25, 2017: Journal of Neural Transmission
https://www.readbyqxmd.com/read/28238186/effects-of-hallucinogens-on-neuronal-activity
#15
L Lladó-Pelfort, P Celada, M S Riga, E Troyano-Rodríguez, N Santana, F Artigas
Hallucinogens evoke sensory, perceptual, affective, and cognitive effects that may be useful to understand the neurobiological basis of mood and psychotic disorders. The present chapter reviews preclinical research carried out in recent years in order to better understand the action of psychotomimetic agents such as the noncompetitive NMDA receptor (NMDA-R) antagonists and serotonergic hallucinogens. Our studies have focused on the mechanisms through which these agents alter cortical activity. Noncompetitive NMDA-R antagonists, such as phencyclidine (PCP) and MK-801 (dizocilpine), as well as the serotonergic hallucinogens DOI and 5-MeO-DMT, produce similar effects on cellular and population activity in prefrontal cortex (PFC); these effects include alterations of pyramidal neuron discharge (with an overall increase in firing), as well as a marked attenuation of the low frequency oscillations (0...
February 26, 2017: Current Topics in Behavioral Neurosciences
https://www.readbyqxmd.com/read/28238108/enhanced-vascular-biocompatibility-of-decellularized-xeno-allogeneic-matrices-in-a-rodent-model
#16
M van Steenberghe, T Schubert, Y Guiot, C Bouzin, X Bollen, P Gianello
Glutaraldehyde preservation is the gold standard for cardiovascular biological prosthesis. However, secondary calcifications and the absence of tissue growth remain major limitations. Our study assessed in vitro and in vivo the biocompatibility of human (fascia lata, pericardium) and porcine tissues (pericardium, peritoneum) treated with a physicochemical procedure for decellularization and non-conventional pathogens inactivation. Biopsies were performed before and after treatment to assess decellularization (HE/Dapi staining/DNA quantification/MHC I/alpha gal immunostaining) and mechanical integrity...
February 25, 2017: Cell and Tissue Banking
https://www.readbyqxmd.com/read/28238065/cuprizone-containing-pellets-are-less-potent-to-induce-consistent-demyelination-in-the-corpus-callosum-of-c57bl-6-mice
#17
Tanja Hochstrasser, Gianna Lisa Exner, Stella Nyamoya, Christoph Schmitz, Markus Kipp
The chopper chelator cuprizone serves as a valuable chemical tool to induce consistent and reproducible demyelination in the central nervous system. However, the daily preparation of fresh cuprizone powder mixed in finely ground rodent chow might well be a particular health problem. Alternative methods, such as the fabrication of cuprizone-containing pellets, are available. The effectiveness of this method is, however, not known. In the present study, we compared whether intoxication of C57BL/6 mice with 0...
February 25, 2017: Journal of Molecular Neuroscience: MN
https://www.readbyqxmd.com/read/28237809/pregnenolone-16%C3%AE-carbonitrile-ameliorates-concanavalin-a-induced-liver-injury-in-mice-independent-of-the-nuclear-receptor-pxr-activation
#18
Susumu Kodama, Takuto Shimura, Hideaki Kuribayashi, Taiki Abe, Kouichi Yoshinari
The pregnane X receptor (PXR) is well-known as a key regulator of drug/xenobiotic clearance. Upon activation by ligand, PXR transcriptionally upregulates the expression of drug-metabolizing enzymes and drug transporters. Recent studies have revealed that PXR also plays a role in regulating immune/inflammatory responses. Specific PXR activators, including synthetic ligands and phytochemicals, have been shown to ameliorate chemically induced colitis in mice. In this study, we investigated an anti-inflammatory effect of pregnenolone 16α-carbonitrile (PCN), a prototypical activator for rodent PXR, in concanavalin A (Con A)-induced liver injury, a model of immune-mediated liver injury, using wild-type and Pxr(-/-) mice...
February 22, 2017: Toxicology Letters
https://www.readbyqxmd.com/read/28237808/nitrite-therapy-prevents-chlorine-gas-toxicity-in-rabbits
#19
Jaideep Honavar, Stephen Doran, Karina Ricart, Sadis Matalon, Rakesh P Patel
Chlorine (Cl2) gas exposure and toxicity remains a concern in military and industrial sectors. While post-Cl2 exposure damage to the lungs and other tissues has been documented and major underlying mechanisms elucidated, no targeted therapeutics that are effective when administered post-exposure, and which are amenable to mass-casualty scenarios have been developed. Our recent studies show nitrite administered by intramuscular (IM) injection post-Cl2 exposure is effective in preventing acute lung injury and improving survival in rodent models...
February 22, 2017: Toxicology Letters
https://www.readbyqxmd.com/read/28237805/noradrenergic-regulation-of-plasticity-marker-expression-in-the-adult-rodent-piriform-cortex
#20
Krishna C Vadodaria, Sudhirkumar U Yanpallewar, Mayur Vadhvani, Devyani Toshniwal, L Cameron Liles, Karen S Rommelfanger, David Weinshenker, Vidita A Vaidya
The adult rodent piriform cortex has been reported to harbor immature neurons that express markers associated with neurodevelopment and plasticity, namely polysialylated neural cell adhesion molecule (PSA-NCAM) and doublecortin (DCX). We characterized the expression of PSA-NCAM and DCX across the rostrocaudal axis of the rat piriform cortex and observed higher numbers of PSA-NCAM and DCX positive cells in the posterior subdivision. As observed in the rat piriform cortex, Nestin-GFP reporter mice also revealed a similar gradient of GFP-positive cells with an increasing rostro-caudal gradient of expression...
February 22, 2017: Neuroscience Letters
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