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Prefrontal cortex

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https://www.readbyqxmd.com/read/28719854/clinically-silent-alzheimer-s-and-vascular-pathologies-influence-brain-networks-supporting-executive-function-in-healthy-older-adults
#1
Brian T Gold, Christopher A Brown, Jonathan G Hakun, Leslie M Shaw, John Q Trojanowski, Charles D Smith
Aging is associated with declines in executive function. We examined how executive functional brain systems are influenced by clinically silent Alzheimer's disease (AD) pathology and cerebral white-matter hyperintensities (WMHs). Twenty-nine younger adults and 34 cognitively normal older adults completed a working memory paradigm while functional magnetic resonance imaging was performed. Older adults further underwent lumbar cerebrospinal fluid draw for the assessment of AD pathology and FLAIR imaging for the assessment of WMHs...
June 24, 2017: Neurobiology of Aging
https://www.readbyqxmd.com/read/28719141/neonatal-infection-produces-significant-changes-in-immune-function-with-no-associated-learning-deficits-in-juvenile-rats
#2
Brittany F Osborne, Jasmine I Caulfield, Samantha A Solomotis, Jaclyn M Schwarz
The current experiments examined the impact of early-life immune activation and a subsequent mild immune challenge with lipopolysaccharide (LPS; 25µg/kg) on hippocampal-dependent learning, proinflammatory cytokine expression in the brain, and peripheral immune function in juvenile male and female rats at P24, an age when hippocampal-dependent learning and memory first emerges. Our results indicate that neonatal infection did not produce learning deficits in the hippocampal-dependent context pre-exposure facilitation effect (CPFE) paradigm in juvenile males and females, contrary to what has been observed in adults...
July 18, 2017: Developmental Neurobiology
https://www.readbyqxmd.com/read/28718955/an-electrochemiluminescent-method-for-glutamate-measurement-in-small-microdialysate-samples-in-asphyxiated-young-rats
#3
Jorge Ortega-Ibarra, Silvia López-Pérez, Alberto Morales-Villagrán
Glutamate (Glu) quantification has been performed by a combination of intracerebral microdialysis through which the samples are obtained and analyzed by high performance liquid chromatography (HPLC); its measurement requires a large expenditure of time (15-30 min per sample) and special training. Therefore, an alternative method is presented here, based on the electrochemiluminescence produced by the use of an enzymatic reactor, containing glutamate-oxidase, mixed and incubated with microdialysate from dorsal striatum (DS) and prefrontal cortex (PFC) of young rats asphyxiated during the neonatal period, under a global asphyxia model in order to test this method...
July 18, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28718892/methoxetamine-affects-brain-processing-involved-in-emotional-response-in-rats
#4
M T Zanda, P Fadda, S Antinori, M di Chio, W Fratta, C Chiamulera, L Fattore
BACKGROUND AND PURPOSE: Methoxetamine (MXE) is a novel psychoactive substance that is emerging on the Internet and induces dissociative effects and acute toxicity. Yet, its pharmacological effects are still poorly investigated. EXPERIMENTAL APPROACH: We examined a range of behavioural effects induced by acute intraperitoneal administration of MXE (0.5-5 mg/kg) in rats, and whether it causes rapid neuroadaptive molecular changes. KEY RESULTS: MXE (0...
July 18, 2017: British Journal of Pharmacology
https://www.readbyqxmd.com/read/28718814/physiological-effects-of-touching-wood
#5
Harumi Ikei, Chorong Song, Yoshifumi Miyazaki
This study aimed to clarify the physiological effects of touching wood with the palm, in comparison with touching other materials on brain activity and autonomic nervous activity. Eighteen female university students (mean age, 21.7  ±  1.6 years) participated in the study. As an indicator of brain activity, oxyhemoglobin (oxy-Hb) concentrations were measured in the left/right prefrontal cortex using near-infrared time-resolved spectroscopy. Heart rate variability (HRV) was used as an indicator of autonomic nervous activity...
July 18, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28717158/neural-processing-of-biological-motion-in-autism-an-investigation-of-brain-activity-and-effective-connectivity
#6
Kaat Alaerts, Stephan P Swinnen, Nicole Wenderoth
The superior temporal sulcus (STS) forms a key region for social information processing and disruptions of its function have been associated with socio-communicative impairments characteristic of autism spectrum disorders (ASD). Task-based fMRI was applied in 15 adults with ASD and 15 matched typical-controls (TC) to explore differences in activity and effective connectivity of STS while discriminating either 'intact' versus 'scrambled' biological motion point light displays (explicit processing) or responding to a color-change while the 'intact' versus 'scrambled' nature of the stimulus was irrelevant for the task (implicit processing)...
July 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28716952/differential-involvement-of-the-medial-prefrontal-cortex-across-variants-of-contextual-fear-conditioning
#7
Nicholas A Heroux, Patrese A Robinson-Drummer, Hollie R Sanders, Jeffrey B Rosen, Mark E Stanton
The context preexposure facilitation effect (CPFE) is a contextual fear conditioning paradigm in which learning about the context, acquiring the context-shock association, and retrieving/expressing contextual fear are temporally dissociated into three distinct phases. In contrast, learning about the context and the context-shock association happens concurrently in standard contextual fear conditioning (sCFC). By infusing the GABAA receptor agonist muscimol into medial prefrontal cortex (mPFC) in adolescent Long-Evans rats, the current set of experiments examined the functional role of the mPFC in each phase of the CPFE and sCFC...
August 2017: Learning & Memory
https://www.readbyqxmd.com/read/28716528/treatment-with-trek1-and-trpc3-6-ion-channel-inhibitors-upregulates-microrna-expression-in-a-mouse-model-of-chronic-mild-stress
#8
İlay Buran, Ebru Önalan Etem, Ahmet Tektemur, Halit Elyas
Depression is a common mental disorder characterized by the mood of deep sadness. Recent studies have demonstrated that microRNAs and ion channels have significant roles in the etiopathogenesis of depression. Therefore, we investigated the effects of the TREK1 ion channel inhibitor anandamide and the TRPC3/6 inhibitor norgestimate on microRNA expression and antidepressant effect in the mouse chronic mild stress (CMS) model of depression. Male BALB/c mice were divided into groups as control, CMS, CMS+sertraline, CMS+anandamide, CMS+sertraline+anandamide, CMS+norgestimate and CMS+sertraline+norgestimate...
July 14, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28716399/prelimbic-%C3%AE-1-adrenoceptors-are-involved-in-the-regulation-of-depressive-like-behaviors-in-the-hemiparkinsonian-rats
#9
Zhong Heng Wu, Qiao Jun Zhang, Cheng Xue Du, Yue Xi, Wen Juan Li, Fang Yuan Guo, Shu Qi Yu, Ya Xin Yang, Jian Liu
At present, it is not clear whether α1-adrenoceptors in the prelimbic cortex (PrL) are involved in Parkinson's disease-related depression. Here we examined effects of PrL α1-adrenoceptors on depressive-like behaviors in rats with unilateral 6-hydroxydopamine lesions of the medial forebrain bundle. The lesion induced depressive-like responses as measured by the sucrose preference and forced swim tests compared to sham-operated rats. Intra-PrL injection of α1-adrenoceptor agonist phenylephrine induced or increased the expression of depressive-like behaviors in sham-operated and the lesioned rats...
July 14, 2017: Brain Research Bulletin
https://www.readbyqxmd.com/read/28715880/effects-of-acute-high-intensity-resistance-exercise-on-cognitive-function-and-oxygenation-in-prefrontal-cortex
#10
Hyukki Chang, Kyungae Kim, Yu-Jin Jung, Morimasa Kato
PURPOSE: Moderate-intensity exercise is known to be the best effective intensity to enhance cognitive function, including memory and learning. However, the effects of high-intensity exercise in comparison with moderate- intensity exercise on cognitive function remain controversial. The aim of this study was to investigate the effect of high-intensity resistance exercise on cognitive function. METHODS: Thirty-six healthy female college students volunteered to participate in this study...
June 30, 2017: Journal of Exercise Nutrition & Biochemistry
https://www.readbyqxmd.com/read/28715349/altered-neural-responses-to-heat-pain-in-drug-naive-patients-with-parkinson-disease
#11
Katarina Forkmann, Wiebke Grashorn, Katharina Schmidt, Odette Fründt, Carsten Buhmann, Ulrike Bingel
Pain is a frequent but still neglected nonmotor symptom of Parkinson disease (PD). However, neural mechanisms underlying pain in PD are poorly understood. Here, we explored whether the high prevalence of pain in PD might be related to dysfunctional descending pain control. Using functional magnetic resonance imaging we explored neural responses during the anticipation and processing of heat pain in 21 PD patients (Hoehn and Yahr I-III) and 23 healthy controls (HC). Parkinson disease patients were naive to dopaminergic medication to avoid confounding drug effects...
August 2017: Pain
https://www.readbyqxmd.com/read/28715119/lateral-prefrontal-orbitofrontal-cortex-has-different-roles-in-norm-compliance-in-gain-and-loss-domains-a-transcranial-current-stimulation-tdcs-study
#12
Yunlu Yin, Hongbo Yu, Zhongbin Su, Yuan Zhang, Xiaolin Zhou
Sanction is used by almost all known human societies to enforce fairness norm in resource distribution. Previous studies have consistently shown that the lateral prefrontal cortex (lPFC) and the adjacent orbitofrontal cortex (lOFC) play a causal role in mediating the effect of sanction threat on norm compliance. However, most of these studies were conducted in the gain domain in which resources are distributed among members. Little is known about the mechanisms underlying norm compliance in the loss domain in which individual sacrifices are needed...
July 17, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/28714806/loss-of-control-over-the-ethanol-consumption-differential-transcriptional-regulation-in-prefrontal-cortex
#13
Carolina de Paiva Lima, Daniel Almeida da Silva E Silva, Samara Damasceno, Andrea Frozino Ribeiro, Cristiane S Rocha, Alexandre H Berenguer de Matos, Diego Correia, Roseli Boerngen-Lacerda, Ana Lúcia Brunialti Godard
Alcohol use disorder (AUD) is a complex multifactorial disease with heritability of ∼50% and corresponds to the state in which the body triggers a reinforcement or reward compulsive behavior due to ethanol consumption, even when faced with negative consequences. Although several studies have shown the impact of high ethanol intake on the prefrontal cortex (PFC) gene expression, few have addressed the relationship between the patterns of gene expression underlying the compulsive behaviour associated with relapsing...
July 17, 2017: Journal of Neurogenetics
https://www.readbyqxmd.com/read/28714715/the-development-of-perineuronal-nets-around-parvalbumin-gabaergic-neurons-in-the-medial-prefrontal-cortex-and-basolateral-amygdala-of-rats
#14
Kathryn D Baker, Arielle R Gray, Rick Richardson
Perineuronal nets (PNNs) are extracellular matrix structures that preferentially surround mature GABAergic neurons that express the calcium-binding protein parvalbumin (PV). It has been suggested that aberrant PNN formation in humans may contribute to psychological disorders, many of which emerge during childhood and adolescence. The present experiment investigated the normative developmental trajectory of PNN formation in the medial prefrontal cortex (mPFC) and basolateral amygdala (BLA) in juvenile (P24), adolescent (P35-36), and adult (∼P70) rats...
August 2017: Behavioral Neuroscience
https://www.readbyqxmd.com/read/28714714/no-evidence-for-enhancements-to-visual-working-memory-with-transcranial-direct-current-stimulation-to-prefrontal-or-posterior-parietal-cortices
#15
Matthew K Robison, William P McGuirk, Nash Unsworth
The present study examined the relative contributions of the prefrontal cortex (PFC) and posterior parietal cortex (PPC) to visual working memory. Evidence from a number of different techniques has led to the theory that the PFC controls access to working memory (i.e., filtering), determining which information is encoded and maintained for later use whereas the parietal cortex determines how much information is held at 1 given time, regardless of relevance (i.e., capacity; McNab & Klingberg, 2008; Vogel, McCollough, & Machizawa, 2005)...
August 2017: Behavioral Neuroscience
https://www.readbyqxmd.com/read/28714693/stochastic-simulation-of-dopamine-neuromodulation-for-implementation-of-fluorescent-neurochemical-probes-in-the-striatal-extracellular-space
#16
Abraham Beyene, Ian McFarlane, Rebecca Pinals, Markita P Landry
Imaging the dynamic behavior of neuromodulatory neurotransmitters in the extracelluar space arising from individual quantal releases would constitute a major advance in neurochemical imaging. Spatial and temporal resolution of these highly stochastic neuromodulatory events requires concurrent advances in the chemical development of optical nanosensors selective for neuromodulators in concert with advances in imaging methodologies to capture millisecond neurotransmitter release. Herein, we develop and implement a stochastic model to describe dopamine dynamics in the extracellular space (ECS) of the brain dorsal striatum to guide the design and implementation of fluorescent neurochemical probes that record neurotransmitter dynamics in the ECS...
July 17, 2017: ACS Chemical Neuroscience
https://www.readbyqxmd.com/read/28714563/the-effect-of-prefrontal-transcranial-direct-current-stimulation-on-attention-network-function-in-healthy-volunteers
#17
Joanna Astrid Miler, Daniel Meron, David S Baldwin, Matthew Garner
OBJECTIVES: The effect of acute transcranial direct current stimulation (tDCS) on cortical attention networks remains unclear. We examined the effect of 20 min of 2 mA dorsolateral prefrontal cortex tDCS (bipolar balanced montage) on the efficiency of alerting, orienting and executive attention networks measured by the attention network test. MATERIALS AND METHODS: A between-subjects stratified randomized design compared active tDCS vs. sham tDCS on attention network function in healthy young adults...
July 17, 2017: Neuromodulation: Journal of the International Neuromodulation Society
https://www.readbyqxmd.com/read/28713915/concurrent-administration-of-thyroxine-and-donepezil-induces-plastic-changes-in-the-prefrontal-cortex-of-adult-hypothyroid-rats
#18
Fen Wang, Zhangbi Wu, Xiaoxue Zha, Yaojun Cai, Bo Wu, Xuemei Jia, Defa Zhu
The aim of the present study was to observe the effects of the concurrent administration of thyroxine (T4) and an acetylcholinesterase (AChE) inhibitor, donepezil (DON), on the hypothyroidism‑induced ultrastructural changes of the prefrontal cortex (PFC) in adult rats. The acetylcholine (ACh) content and AChE activity was assessed, as well as the expressions of synaptotagmin‑1 (syt‑1) and SNAP‑25 were analyzed in the rats. Adding 0.05% propylthiouracil to rats' drinking water induced a hypothyroid rat model...
July 14, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28713328/recovery-from-unrecognized-sleep-loss-accumulated-in-daily-life-improved-mood-regulation-via-prefrontal-suppression-of-amygdala-activity
#19
Yuki Motomura, Shingo Kitamura, Kyoko Nakazaki, Kentaro Oba, Ruri Katsunuma, Yuri Terasawa, Akiko Hida, Yoshiya Moriguchi, Kazuo Mishima
Many modern people suffer from sleep debt that has accumulated in everyday life but is not subjectively noticed [potential sleep debt (PSD)]. Our hypothesis for this study was that resolution of PSD through sleep extension optimizes mood regulation by altering the functional connectivity between the amygdala and prefrontal cortex. Fifteen healthy male participants underwent an experiment consisting of a baseline (BL) evaluation followed by two successive interventions, namely, a 9-day sleep extension followed by one night of total sleep deprivation (TSD)...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28713313/the-burden-of-binge-and-heavy-drinking-on-the-brain-effects-on-adolescent-and-young-adult-neural-structure-and-function
#20
REVIEW
Anita Cservenka, Ty Brumback
Introduction: Adolescence and young adulthood are periods of continued biological and psychosocial maturation. Thus, there may be deleterious effects of consuming large quantities of alcohol on neural development and associated cognition during this time. The purpose of this mini review is to highlight neuroimaging research that has specifically examined the effects of binge and heavy drinking on adolescent and young adult brain structure and function. Methods: We review cross-sectional and longitudinal studies of young binge and heavy drinkers that have examined brain structure (e...
2017: Frontiers in Psychology
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