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Hippocampal neurogenesis

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https://www.readbyqxmd.com/read/29230619/neuroanatomical-and-molecular-correlates-of-cognitive-and-behavioural-outcomes-in-hypogonadal-males
#1
O B Akinola, M O Gabriel
Robust epidemiological, clinical and laboratory evidence supports emerging roles for the sex steroids in such domains as neurodevelopment, behaviour, learning and cognition. Regions of the mammalian brain that are involved in cognitive development and memory do not only express the classical nuclear androgen receptor, but also the non-genomic membrane receptor, which is a G protein-coupled receptor that mediates some rapid effects of the androgens on neurogenesis and synaptic plasticity. Under physiological conditions, hippocampal neurons do express the enzyme aromatase, and therefore actively aromatize testosterone to oestradiol...
December 11, 2017: Metabolic Brain Disease
https://www.readbyqxmd.com/read/29229768/revealing-age-related-changes-of-adult-hippocampal-neurogenesis-using-mathematical-models
#2
Frederik Ziebell, Sascha Dehler, Ana Martin-Villalba, Anna Marciniak-Czochra
New neurons are continuously generated in the dentate gyrus of the adult hippocampus. This continuous supply of newborn neurons is important to modulate cognitive functions. Yet, the number of newborn neurons declines with age. Increasing Wnt activity upon loss of the Dickkopf-1 can counteract both the decline of newborn neurons and the age-related cognitive decline. However, the precise cellular changes underlying the age-related decline or its rescue are fundamentally not understood. The present study combines a mathematical model and experimental data to address features controlling neural stem cell (NSC) dynamics...
December 11, 2017: Development
https://www.readbyqxmd.com/read/29229413/constant-light-environment-suppresses-maturation-and-reduces-complexity-of-new-born-neuron-processes-in-the-hippocampus-and-caudal-nidopallium-of-a-diurnal-corvid-implication-for-impairment-of-the-learning-and-cognitive-performance
#3
S K Tahajjul Taufique, Abhilash Prabhat, Vinod Kumar
Periodic day-night environment shapes the temporal pattern in the behaviour and physiology (e.g. 24-h activity-rest and sleep-wake cycles) and the advanced brain function, such as learning, memory and decision making. In a previous study, we showed the abolition of 24-h rhythm in the activity-rest pattern, and an attenuated cognitive performance in diurnal Indian house crows (Corvus splendens) under constant light (no-night; LL) environment. Present study extended this, and investigated LL-induced effects on the neurogenesis (birth, maturation and neurite complexity of new born neurons) in the hippocampus and caudal nidopallium, the brain regions directly associated with learning and cognition in birds...
December 8, 2017: Neurobiology of Learning and Memory
https://www.readbyqxmd.com/read/29226998/antisense-suppression-of-glial-fibrillary-acidic-protein-as-a-treatment-for-alexander-disease
#4
Tracy L Hagemann, Berit Powers, Curt Mazur, Aneeza Kim, Steven Wheeler, Gene Hung, Eric Swayze, Albee Messing
OBJECTIVE: Alexander disease is a fatal leukodystrophy caused by autosomal dominant gain-of-function mutations in the gene for glial fibrillary acidic protein (GFAP), an intermediate filament protein primarily expressed in astrocytes of the central nervous system. A key feature of pathogenesis is over-expression and accumulation of GFAP, with formation of characteristic cytoplasmic aggregates known as Rosenthal fibers. Here we investigate whether suppressing GFAP with antisense oligonucleotides could provide a therapeutic strategy for treating Alexander disease...
December 11, 2017: Annals of Neurology
https://www.readbyqxmd.com/read/29225572/adaptive-changes-in-the-sensitivity-of-the-dorsal-raphe-and-hypothalamic-paraventricular-nuclei-to-acute-exercise-and-hippocampal-neurogenesis-may-contribute-to-the-antidepressant-effect-of-regular-treadmill-running-in-rats
#5
Ayu Nishii, Seiichiro Amemiya, Natsuko Kubota, Takeshi Nishijima, Ichiro Kita
Increasing clinical evidence suggests that regular physical exercise can prevent or reduce the incidence of stress-related psychiatric disorders including depressive symptoms. Antidepressant effect of regular exercise may be implicated in monoaminergic transmission including serotonergic transmission, activation of the hypothalamic-pituitary-adrenal (HPA) axis, and hippocampal neurogenesis, but few general concepts regarding the optimal exercise regimen for stimulating neural mechanisms involved in antidepressant properties have been developed...
2017: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/29213032/-staging-of-neuroplasticity-alterations-during-epileptogenesis-temporal-lobe-epileply-as-an-example
#6
N V Gulyaeva
Using temporal lobe epilepsy as an example, staging of long term plasticity in the hippocampus is considered. Major stages demonstrating opposite alterations in neuroplasticity are active epileptogenesis and the period of established temporal lobe epilepsy. During the epileptogenesis, multiple events resulting in forming of epileptic neuronal nets occur: changes in glutamatergic and GABAergic neurons, increase of aberrant neurogenesis, axonal sprouting and dendrite remodeling, particularly, supported by an excessive enhancement of the BDNF system in specific hippocampal regions...
2017: Zhurnal Nevrologii i Psikhiatrii Imeni S.S. Korsakova
https://www.readbyqxmd.com/read/29211774/food-restriction-reduces-neurogenesis-in-the-avian-hippocampal-formation
#7
Barbara-Anne Robertson, Lucy Rathbone, Giselda Cirillo, Richard B D'Eath, Melissa Bateson, Timothy Boswell, Peter W Wilson, Ian C Dunn, Tom V Smulders
The mammalian hippocampus is particularly vulnerable to chronic stress. Adult neurogenesis in the dentate gyrus is suppressed by chronic stress and by administration of glucocorticoid hormones. Post-natal and adult neurogenesis are present in the avian hippocampal formation as well, but much less is known about its sensitivity to chronic stressors. In this study, we investigate this question in a commercial bird model: the broiler breeder chicken. Commercial broiler breeders are food restricted during development to manipulate their growth curve and to avoid negative health outcomes, including obesity and poor reproductive performance...
2017: PloS One
https://www.readbyqxmd.com/read/29203796/aerobic-exercise-and-a-bdnf-mimetic-therapy-rescue-learning-and-memory-in-a-mouse-model-of-down-syndrome
#8
Martina Parrini, Diego Ghezzi, Gabriele Deidda, Lucian Medrihan, Enrico Castroflorio, Micol Alberti, Pietro Baldelli, Laura Cancedda, Andrea Contestabile
Down syndrome (DS) is caused by the triplication of human chromosome 21 and represents the most frequent genetic cause of intellectual disability. The trisomic Ts65Dn mouse model of DS shows synaptic deficits and reproduces the essential cognitive disabilities of the human syndrome. Aerobic exercise improved various neurophysiological dysfunctions in Ts65Dn mice, including hippocampal synaptic deficits, by promoting synaptogenesis and neurotransmission at glutamatergic terminals. Most importantly, the same intervention also prompted the recovery of hippocampal adult neurogenesis and synaptic plasticity and restored cognitive performance in trisomic mice...
December 4, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29203333/perinatal-fluoxetine-increases-hippocampal-neurogenesis-and-reverses-the-lasting-effects-of-pre-gestational-stress-on-serum-corticosterone-but-not-on-maternal-behavior-in-the-rat-dam
#9
Mary Gemmel, Danny Harmeyer, Eszter Bögi, Marianne Fillet, Lesley A Hill, Geoffrey L Hammond, Thierry D Charlier, Jodi L Pawluski
There is increasing evidence that mental health concerns, stress-related mental illnesses, and parental stress prior to conception have long-term effects on offspring outcomes. However, more work is needed to understand how pre-gestational stress might affect neurobehavioral outcomes in the mother. We investigated how chronic stress prior to gestation affects the maternal behavior and related physiology, and aimed to determine the role that perinatal SSRIs may have in altering these stress effects. To do this, female Sprague-Dawley rats were subject to chronic unpredictable stress (CUS) prior to breeding and during the perinatal period they were administered fluoxetine (10mg/kg/day)...
December 1, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/29202785/anti-aggregant-tau-mutant-promotes-neurogenesis
#10
Maria Joseph, Marta Anglada-Huguet, Katharina Paesler, Eckhard Mandelkow, Eva-Maria Mandelkow
BACKGROUND: The microtubule-associated protein Tau plays a role in neurodegeneration as well as neurogenesis. Previous work has shown that the expression of the pro-aggregant mutant Tau repeat domain causes strong aggregation and pronounced neuronal loss in the hippocampus whereas the anti-aggregant form has no deleterious effects. These two proteins differ mainly in their propensity to form ß structure and hence to aggregate. METHODS: To elucidate the basis of these contrasting effects, we analyzed organotypic hippocampal slice cultures (OHSCs) from transgenic mice expressing the repeat domain (RD) of Tau with the anti-aggregant mutation (TauRDΔKPP) and compared them with slices containing pro-aggregant TauRDΔK...
December 4, 2017: Molecular Neurodegeneration
https://www.readbyqxmd.com/read/29197324/altered-phosphorylation-electrophysiology-and-behavior-on-attenuation-of-pde4b-action-in-hippocampus
#11
Susan L Campbell, Thomas van Groen, Inga Kadish, Lisa High Mitchell Smoot, Graeme B Bolger
BACKGROUND: PDE4 cyclic nucleotide phosphodiesterases regulate 3', 5' cAMP abundance in the CNS and thereby regulate PKA activity and phosphorylation of CREB, which has been implicated in learning and memory, depression and other functions. The PDE4 isoform PDE4B1 also interacts with the DISC1 protein, implicated in neural development and behavioral disorders. The cellular functions of PDE4B1 have been investigated extensively, but its function(s) in the intact organism remained unexplored...
December 2, 2017: BMC Neuroscience
https://www.readbyqxmd.com/read/29196444/temporal-analysis-of-hippocampal-ca3-gene-co-expression-networks-in-a-rat-model-of-febrile-seizures
#12
Hatylas Azevedo, Nathália Amato Khaled, Paula Santos, Fernanda Bernardi Bertonha, Carlos Alberto Moreira-Filho
Complex febrile seizures during infancy constitute an important risk factor for epilepsy development. However, little is known about the alterations induced by febrile seizures that may turn the brain susceptible to epileptic activity. In this context, the use of animal models of hyperthermic seizures (HS) could allow the temporal analysis of brain molecular changes that arise after febrile seizures. Here, we investigated temporal changes in hippocampal gene co-expression networks during the development of rats submitted to HS...
November 30, 2017: Disease Models & Mechanisms
https://www.readbyqxmd.com/read/29187321/impaired-neurogenesis-and-associated-gliosis-in-mouse-brain-with-pex13-deficiency
#13
Rani Sadia Rahim, James A St John, Denis I Crane, Adrian C B Meedeniya
Zellweger syndrome (ZS), a neonatal lethal disorder arising from defective peroxisome biogenesis, features profound neuroanatomical abnormalities and brain dysfunction. Here we used mice with brain-restricted inactivation of the peroxisome biogenesis gene PEX13 to model the pathophysiological features of ZS, and determine the impact of peroxisome dysfunction on neurogenesis and cell maturation in ZS. In the embryonic and postnatal PEX13 mutant brain, we demonstrate key regions with altered brain anatomy, including enlarged lateral ventricles and aberrant cortical, hippocampal and hypothalamic organization...
November 26, 2017: Molecular and Cellular Neurosciences
https://www.readbyqxmd.com/read/29185071/review-adult-neurogenesis-contributes-to-hippocampal-plasticity
#14
REVIEW
Tomohisa Toda, Fred H Gage
Adult hippocampal neurogenesis is the process by which new functional neurons are added to the adult dentate gyrus of the hippocampus. Animal studies have shown that the degree of adult hippocampal neurogenesis is regulated by local environmental cues as well as neural network activities. Furthermore, accumulating evidence has suggested that adult hippocampal neurogenesis plays prominent roles in hippocampus-dependent brain functions. In this review, we summarize the mechanisms underlying the regulation of adult hippocampal neurogenesis at various developmental stages and propose how adult-born neurons contribute to structural and functional hippocampal plasticity...
November 29, 2017: Cell and Tissue Research
https://www.readbyqxmd.com/read/29184142/a-simulation-model-of-neuroprogenitor-proliferation-dynamics-predicts-age-related-loss-of-hippocampal-neurogenesis-but-not-astrogenesis
#15
Sol Beccari, Jorge Valero, Mirjana Maletic-Savatic, Amanda Sierra
Adult hippocampal neuroprogenitors give rise to both neurons and astrocytes. As neuroprogenitors are lost with increased age, neurogenesis concomitantly decreases. However, the dynamics of neuron and astrocyte generation throughout adulthood has not been systematically examined. Here, we analyzed the hippocampal niche both longitudinally (from 2 h to 30d of cell life) and transversally (from 1 m to 12 m of age) and generated a Marsaglia polar random simulation model to predict newborn cell dynamics. The sharp decrease in newborn neuron production throughout adulthood was largely predicted by the number of proliferating neuroprogenitors at each age...
November 28, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29178684/a-supervised-exercise-intervention-for-youth-at-risk-for-psychosis-an-open-label-pilot-study
#16
Derek J Dean, Angela D Bryan, Raeana Newberry, Tina Gupta, Emily Carol, Vijay A Mittal
OBJECTIVE: A rapidly accumulating body of research suggests that exercise can improve symptoms and well-being in patients suffering from psychosis. Exercise may also promote neurogenesis in the hippocampus, a structure that plays an important role in the pathophysiology of psychosis. To date, there has not been an intervention focused on exercise prior to the onset of psychosis, a critical time for prevention of more serious illness. METHODS: In this pilot study, 12 young adults at ultrahigh risk (UHR) for psychosis were enrolled in a 12-week open-label exercise intervention...
November 21, 2017: Journal of Clinical Psychiatry
https://www.readbyqxmd.com/read/29175485/short-and-long-term-exposure-to-low-and-high-dose-running-produce-differential-effects-on-hippocampal-neurogenesis
#17
Carine Nguemeni, Matthew W McDonald, Matthew S Jeffers, Jessica Livingston-Thomas, Diane Lagace, Dale Corbett
Continuous running wheel (RW) exercise increases adult hippocampal neurogenesis in the dentate gyrus (DG) of rodents. Evidence suggests that greater amounts of RW exercise does not always equate to more adult-generated neurons in hippocampus. It can also be argued that continuous access to a RW results in exercise levels not representative of human exercise patterns. This study tested if RW paradigms that more closely represent human exercise patterns (e.g. shorter bouts, alternating daily exercise) alter neurogenesis...
November 22, 2017: Neuroscience
https://www.readbyqxmd.com/read/29175309/altered-neuro-inflammatory-gene-expression-in-hippocampus-in-major-depressive-disorder
#18
Gouri J Mahajan, Eric J Vallender, Michael R Garrett, Lavanya Challagundla, James C Overholser, George Jurjus, Lesa Dieter, Maryam Syed, Damian G Romero, Hamed Benghuzzi, Craig A Stockmeier
Major Depressive Disorder (MDD) is a common psychiatric disorder for which available medications are often not effective. The high prevalence of MDD and modest response to existing therapies compels efforts to better understand and treat the disorder. Decreased hippocampal volume with increasing duration of depression suggests altered gene expression or even a decrease in neurogenesis. Tissue punches from the dentate gyrus were collected postmortem from 23 subjects with MDD and 23 psychiatrically-normal control subjects...
November 22, 2017: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/29175168/cd8-t-cells-are-essential-for-the-effects-of-enriched-environment-on-hippocampus-dependent-behavior-hippocampal-neurogenesis-and-synaptic-plasticity
#19
Hadi Zarif, Sarah Nicolas, Mélanie Guyot, Salma Hosseiny, Anne Lazzari, María Magdalena Canali, Julie Cazareth, Frédéric Brau, Valentine Golzné, Elisa Dourneau, Maud Maillaut, Carmelo Luci, Agnès Paquet, Kevin Lebrigand, Marie-Jeanne Arguel, Douglas Daoudlarian, Catherine Heurteaux, Nicolas Glaichenhaus, Joëlle Chabry, Alice Guyon, Agnès Petit-Paitel
Enriched environment (EE) induces plasticity changes in the brain. Recently, CD4+ T cells have been shown to be involved in brain plasticity processes. Here, we show that CD8+ T cells are required for EE-induced brain plasticity in mice, as revealed by measurements of hippocampal volume, neurogenesis in the DG of the hippocampus, spinogenesis and glutamatergic synaptic function in the CA of the hippocampus. As a consequence, EE-induced behavioral benefits depend, at least in part, on CD8+ T cells. In addition, we show that spleen CD8+ T cells from mice housed in standard environment (SE) and EE have different properties in terms of 1) TNFα release after in vitro CD3/CD28 or PMA/Iono stimulation 2) in vitro proliferation properties 3) CD8+ CD44+ CD62Llow and CD62Lhi T cells repartition 4) transcriptomic signature as revealed by RNA sequencing...
November 21, 2017: Brain, Behavior, and Immunity
https://www.readbyqxmd.com/read/29174574/enhanced-neurogenesis-in-degenerated-hippocampi-following-pretreatment-with-mir-302-367-expressing-lentiviral-vector-in-mice
#20
Maryam Ghasemi-Kasman, Hossein Baharvand, Mohammad Javan
Astrogliosis is the main landmark of neurodegenerative diseases. In vivo reprogramming of reactive astrocytes to functional neurons opened a new horizon in regenerative medicine. However there is little evidence that show possible application of in vivo reprogramming approaches for enhancement of neurogenesis. Cluster miR-302/367 showed high capability in cell reprogramming. Here we show that application of lentiviral particles expressing cluster miR-302/367 along with systemic valproate (VPA) enhanced the capability of mice brains for neurogenesis in CA3 area following kainic acid (KA) induced hippocampal neurodegeneration...
November 21, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
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