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Hippocampal neurogenesis

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https://www.readbyqxmd.com/read/28088401/pharmacological-rescue-of-adult-hippocampal-neurogenesis-in-a-mouse-model-of-x-linked-intellectual-disability
#1
Manuela Allegra, Cristina Spalletti, Beatrice Vignoli, Stefano Azzimondi, Irene Busti, Pierre Billuart, Marco Canossa, Matteo Caleo
Oligophrenin-1 (OPHN1) is a Rho GTPase activating protein whose mutations cause X-linked intellectual disability (XLID). How loss of function of Ophn1 affects neuronal development is only partly understood. Here we have exploited adult hippocampal neurogenesis to dissect the steps of neuronal differentiation that are affected by Ophn1 deletion. We found that mice lacking Ophn1 display a reduction in the number of newborn neurons in the dentate gyrus. A significant fraction of the Ophn1-deficient newly generated neurons failed to extend an axon towards CA3, and showed an altered density of dendritic protrusions...
January 11, 2017: Neurobiology of Disease
https://www.readbyqxmd.com/read/28077334/the-neuroprotective-compound-p7c3-a20-promotes-neurogenesis-and-improves-cognitive-function-after-ischemic-stroke
#2
Zachary B Loris, Andrew A Pieper, W Dalton Dietrich
Ischemic stroke is a devastating condition with few therapeutic interventions available. The neuroprotective compound P7C3-A20 inhibits mature neuronal cell death while also increasing the net magnitude of postnatal neurogenesis in models of neurodegeneration and acute injury. P7C3 compounds enhance flux of nicotinamide adenine dinucleotide (NAD) in mammalian cells, a proposed therapeutic approach to treating cerebral ischemia. The effectiveness of P7C3-A20 treatment on chronic histopathological and behavioral outcomes and neurogenesis after ischemic stroke has not previously been established...
January 8, 2017: Experimental Neurology
https://www.readbyqxmd.com/read/28067736/alzheimer-s-disease-and-exercise-a-literature-review
#3
Shane P Cass
Alzheimer's disease (AD) is a progressive neurodegenerative disease that impairs memory and cognitive judgment. It is the leading cause of dementia in late adult life and is associated with a significant social burden and increased morbidity and mortality in the elderly. Because of mixed effectiveness of medications, exercise has been considered as a treatment for pre-clinical AD, late stage AD, and as a prevention strategy. Exercise appears to improve brain blood flow, increase hippocampal volume, and improve neurogenesis...
January 2017: Current Sports Medicine Reports
https://www.readbyqxmd.com/read/28064347/influence-of-nicotine-on-doxorubicin-and-cyclophosphamide-combination-treatment-induced-spatial-cognitive-impairment-and-anxiety-like-behavior-in-rats
#4
Yoshihisa Kitamura, Erika Kanemoto, Misaki Sugimoto, Ayumi Machida, Yuka Nakamura, Nanami Naito, Hirotaka Kanzaki, Ikuko Miyazaki, Masato Asanuma, Toshiaki Sendo
In the present study, we examined the effects of nicotine on cognitive impairment, anxiety-like behavior, and hippocampal cell proliferation in rats treated with a combination of doxorubicin and cyclophosphamide. Combined treatment with doxorubicin and cyclophosphamide produced cognitive impairment and anxiety-like behavior in rats. Nicotine treatment reversed the inhibition of novel location recognition induced by the combination treatment. This effect of nicotine was blocked by methyllycaconitine, a selective α7 nicotinic acetylcholine receptor (nAChR) antagonist, and dihydro-β-erythroidine, a selective α4β2 nAChR antagonist...
January 7, 2017: Naunyn-Schmiedeberg's Archives of Pharmacology
https://www.readbyqxmd.com/read/28062256/dehydroepiandrosterone-increases-the-number-and-dendrite-maturation-of-doublecortin-cells-in-the-dentate-gyrus-of-middle-age-male-wistar-rats-exposed-to-chronic-mild-stress
#5
J J Herrera-Pérez, L Martínez-Mota, G Jiménez-Rubio, L Ortiz-López, E A Cabrera-Muñoz, N Galindo-Sevilla, E Zambrano, F Hernández-Luis, G B Ramírez-Rodríguez, M Flores-Ramos
Aging increases the vulnerability to stress and risk of developing depression. These changes have been related to a reduction of dehydroepiandrosterone (DHEA) levels, an adrenal steroid with anti-stress effects. Also, adult hippocampal neurogenesis decreases during aging and its alteration or impaired is related to the development of depression. Besides, it has been hypothesized that DHEA increases the formation of new neurons. However, it is unknown whether treatment with DHEA in aging may stimulate the dendrite maturation of newborn neurons and reversing depressive-like signs evoked by chronic stress exposure...
January 4, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28052868/negative-rebound-in-hippocampal-neurogenesis-following-exercise-cessation
#6
Takeshi Nishijima, Yoshika Kamidozono, Atsushi Ishiizumi, Seiichiro Amemiya, Ichiro Kita
Physical exercise can improve brain function; however, the effects of exercise cessation are largely unknown. This study examined the time-course profile of hippocampal neurogenesis following exercise cessation. Male C57BL/6 mice were randomly assigned to either a control (Con) or an exercise cessation (ExC) group. ExC mice were reared in a cage with a running wheel for 8 weeks and subsequently placed in a standard cage to cease the exercise. Exercise significantly increased the density of doublecortin (DCX)-positive immature neurons in the dentate gyrus (at week 0)...
January 4, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/28049023/aspartame-and-the-hippocampus-revealing-a-bi-directional-dose-time-dependent-behavioural-and-morphological-shift-in-mice
#7
Adejoke Y Onaolapo, Olakunle J Onaolapo, Polycarp U Nwoha
Changes, in behaviour, oxidative markers of stress and hippocampal morphology were evaluated following aspartame administration. Mice, (20-22g each) were given vehicle (10ml/kg) or aspartame (20, 40, 80 and 160mg/kg) daily for 28days. They were tested in the Y-maze, radial-arm maze and elevated plus-maze (EPM) after the first and last dose of vehicle or aspartame; and then sacrificed. Hippocampal slices were analysed for aspartic acid, nitric oxide (NO) and superoxide dismutase (SOD); and processed for general histology and neuritic plaques...
December 31, 2016: Neurobiology of Learning and Memory
https://www.readbyqxmd.com/read/28048979/adult-hippocampal-neurogenesis-is-impaired-by-transient-and-moderate-developmental-thyroid-hormone-disruption
#8
M E Gilbert, J H Goodman, J Gomez, A F M Johnstone, R L Ramos
The hippocampus maintains a capacity for neurogenesis throughout life, a capacity that is reduced in models of adult onset hypothyroidism. The effects of developmental thyroid hormone (TH) insufficiency on neurogenesis in the adult hippocampus, however, has not been examined. Graded degrees of TH insufficiency were induced in pregnant rat dams by administration of 0, 3 or 10ppm of 6-propylthiouracil (PTU) in drinking water from gestational day (GD) 6 until weaning. Body, brain, and hippocampal weight were reduced on postnatal day (PN) 14, 21, 78 and hippocampal volume was smaller at the 10 but not 3ppm dose level...
December 31, 2016: Neurotoxicology
https://www.readbyqxmd.com/read/28045461/antidepressant-responsiveness-in-adulthood-is-permanently-impaired-after-neonatal-destruction-of-the-neurogenic-pool
#9
S Yu, I Zutshi, R Stoffel, J Zhang, A P Ventura-Silva, N Sousa, P S Costa, F Holsboer, A Patchev, O F X Almeida
The dynamic turnover of hippocampal neurons is implicated in the regulation of cognitive and affective behavior. Extending our previous demonstration that administration of dexamethasone (ND) to neonatal rats depletes the resident population of neural precursor cells (NPC) and restrains the size of the neurogenic regions, we now show that the adverse effects of ND persist into adulthood. Specifically, ND impairs repletion of the neurogenic pool and neurogenesis; ND also compromises cognitive performance, the ability to actively adapt to an acute stressor and, the efficacy of glucocorticoid (GC) negative feedback...
January 3, 2017: Translational Psychiatry
https://www.readbyqxmd.com/read/28045430/administration-of-zinc-plus-cyclo-his-pro-increases-hippocampal-neurogenesis-in-rats-during-the-early-phase-of-streptozotocin-induced-diabetes
#10
Bo Young Choi, In Yeol Kim, Jin Hee Kim, Bo Eun Lee, Song Hee Lee, A Ra Kho, Min Sohn, Sang Won Suh
The effects of zinc supplementation on hippocampal neurogenesis in diabetes mellitus have not been studied. Herein, we investigated the effects of zinc plus cyclo-(His-Pro) (ZC) on neurogenesis occurring in the subgranular zone of dentate gyrus after streptozotocin (STZ)-induced diabetes. ZC (27 mg/kg) was administered by gavage once daily for one or six weeks from the third day after the STZ injection, and histological evaluation was performed at 10 (early phase) or 45 (late phase) days after STZ injection...
January 1, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28038945/role-of-the-adhesion-molecule-f3-contactin-in-synaptic-plasticity-and-memory
#11
REVIEW
Walter Gulisano, Antonella Bizzoca, Gianfranco Gennarini, Agostino Palmeri, Daniela Puzzo
Cell adhesion molecules (CAMs) have a pivotal role in building and maintaining synaptic structures during brain development participating in axonal elongation and pathfinding, glial guidance of neuronal migration, as well as myelination. CAMs expression persists in the adult brain particularly in structures undergoing postnatal neurogenesis and involved in synaptic plasticity and memory as the hippocampus. Among the neural CAMs, we have recently focused on F3/Contactin, a glycosylphosphatidyl inositol-anchored glycoprotein belonging to the immunoglobulin superfamily, involved in neuronal development, synaptic maintenance and organization of neuronal networks...
December 28, 2016: Molecular and Cellular Neurosciences
https://www.readbyqxmd.com/read/28035680/exercise-becomes-brain-sustained-aerobic-exercise-enhances-hippocampal-neurogenesis
#12
Tharmegan Tharmaratnam, Robert A Civitarese, Tyler Tabobondung, Taylor A Tabobondung
No abstract text is available yet for this article.
January 1, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28027925/impact-of-prebiotics-on-metabolic-and-behavioral-alterations-in-a-mouse-model-of-metabolic-syndrome
#13
Lourdes Fernández de Cossío, Célia Fourrier, Julie Sauvant, Amandine Everard, Lucile Capuron, Patrice D Cani, Sophie Layé, Nathalie Castanon
Mounting evidence shows that the gut microbiota, an important player within the gut-brain communication axis, can affect metabolism, inflammation, brain function and behavior. Interestingly, gut microbiota composition is known to be altered in patients with metabolic syndrome (MetS), who also often display neuropsychiatric symptoms. The use of prebiotics, which beneficially alters the microbiota, may therefore be a promising way to potentially improve physical and mental health in MetS patients. This hypothesis was tested in a mouse model of MetS, namely the obese and type-2 diabetic db/db mice, which display emotional and cognitive alterations associated with changes in gut microbiota composition and hippocampal inflammation compared to their lean db/+ littermates...
December 24, 2016: Brain, Behavior, and Immunity
https://www.readbyqxmd.com/read/28018679/activation-of-sphingosine-1-phosphate-receptor-1-enhances-hippocampus-neurogenesis-in-a-rat-model-of-traumatic-brain-injury-an-involvement-of-mek-erk-signaling-pathway
#14
Yuqin Ye, Zhenyu Zhao, Hongyu Xu, Xin Zhang, Xinhong Su, Yongxiang Yang, Xinguang Yu, Xiaosheng He
Among sphingosine 1-phosphate receptors (S1PRs) family, S1PR1 has been shown to be the most highly expressed subtype in neural stem cells (NSCs) and plays a crucial role in the migratory property of NSCs. Recent studies suggested that S1PR1 was expressed abundantly in the hippocampus, a specific neurogenic region in rodent brain for endogenous neurogenesis throughout life. However, the potential association between S1PR1 and neurogenesis in hippocampus following traumatic brain injury (TBI) remains unknown...
2016: Neural Plasticity
https://www.readbyqxmd.com/read/28012947/the-gsk-3-inhibitor-vp2-51-produces-antidepressant-effects-associated-with-adult-hippocampal-neurogenesis
#15
Paloma Pérez-Domper, Valle Palomo, Simona Gradari, Carmen Gil, María L de Ceballos, Ana Martínez, Jose Luis Trejo
Glycogen synthase kinase 3 (GSK-3) is a constitutively active kinase that has been implicated in the mechanism of action of mood stabilizers. According to the neurogenic hypothesis of depression, newborn neurons in the adult dentate gyrus are required for the antidepressant effects of certain agents. We demonstrate that administration of the GSK-3 inhibitor VP2.51 (2.5 mg/kg ip, for 3.5 weeks) increases cell proliferation (pH3(+) cells), as well as the short- and long-term survival of newborn neurons (assessed by the 24 h survival of BrdU(+) and DCX(+) neurons), while significantly increasing the commitment of cells to the granule neuron lineage (Prox1 immunoreactivity)...
December 22, 2016: Neuropharmacology
https://www.readbyqxmd.com/read/28012347/enhanced-dendritic-morphogenesis-of-adult-hippocampal-newborn-neurons-in-central-5-ht-deficient-mice
#16
Ning-Ning Song, Qiong Zhang, Ying Huang, Ling Chen, Yu-Qiang Ding, Lei Zhang
Serotonin (5-HT) plays an important role in regulating adult hippocampal neurogenesis. Chronic administration of selective 5-HT reuptake inhibitors (SSRIs), which up-regulates extracellular 5-HT concentration, accelerates the maturation of adult-born hippocampal neurons. It is unknown, however, about effects of central 5-HT-deficiency on the dendritic morphogenesis of these newborn neurons. Here, we address this question using two central 5-HT-deficient mouse models, Tph2 conditional knockout mice (CKO) losing central 5-HT from embryonic stage, and Pet1-Cre;Rosa26-DTR (diphtheria toxin receptor) mice lacking central 5-HT neurons exclusively in adulthood...
December 15, 2016: Stem Cell Research
https://www.readbyqxmd.com/read/28007959/rit1-gtpase-regulates-sox2-transcriptional-activity-and-hippocampal-neurogenesis
#17
Sajad Mir, Weikang Cai, Douglas A Andres
Adult neurogenesis, the process of generating mature neurons from neuronal progenitor cells, makes critical contributions to neural circuitry and brain function under both healthy and disease states. Neurogenesis is a highly regulated process, in which diverse environmental and physiological stimuli are relayed to resident neural stem cell populations to control the transcription of genes involved in their self-renewal and differentiation. Understanding the molecular mechanisms governing neurogenesis is necessary for the development of translational strategies to harness this process for neuronal repair...
December 22, 2016: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28007537/human-umbilical-cord-mesenchymal-stem-cells-transplantation-improves-cognitive-function-in-alzheimer-s-disease-mice-by-decreasing-oxidative-stress-and-promoting-hippocampal-neurogenesis
#18
YuanBo Cui, ShanShan Ma, ChunYan Zhang, Wei Cao, Min Liu, DongPeng Li, PengJu Lv, Qu Xing, RuiNa Qu, Ning Yao, Bo Yang, FangXia Guan
Stem cell transplantation represents a promising therapy for central nervous system injuries, but its application to Alzheimer's disease (AD) is still limited and the potential mechanism for cognition improvement remains to be elucidated. In the present study, we used Tg2576 mice which express AD-like pathological forms of amyloid precursor protein (APP) to investigate the effects of human umbilical cord mesenchymal stem cells (hUC-MSCs) intravenous transplantation on AD mice. Interestingly, hUC-MSCs transplantation significantly ameliorated cognitive function of AD mice without altering Aβ levels in hippocampus...
December 19, 2016: Behavioural Brain Research
https://www.readbyqxmd.com/read/28000773/bioorthogonal-chemical-imaging-of-metabolic-activities-in-live-mammalian-hippocampal-tissues-with-stimulated-raman-scattering
#19
Fanghao Hu, Michael R Lamprecht, Lu Wei, Barclay Morrison, Wei Min
Brain is an immensely complex system displaying dynamic and heterogeneous metabolic activities. Visualizing cellular metabolism of nucleic acids, proteins, and lipids in brain with chemical specificity has been a long-standing challenge. Recent development in metabolic labeling of small biomolecules allows the study of these metabolisms at the global level. However, these techniques generally require nonphysiological sample preparation for either destructive mass spectrometry imaging or secondary labeling with relatively bulky fluorescent labels...
December 21, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27999180/a-ketogenic-diet-rescues-hippocampal-memory-defects-in-a-mouse-model-of-kabuki-syndrome
#20
Joel S Benjamin, Genay O Pilarowski, Giovanni A Carosso, Li Zhang, David L Huso, Loyal A Goff, Hilary J Vernon, Kasper D Hansen, Hans T Bjornsson
Kabuki syndrome is a Mendelian intellectual disability syndrome caused by mutations in either of two genes (KMT2D and KDM6A) involved in chromatin accessibility. We previously showed that an agent that promotes chromatin opening, the histone deacetylase inhibitor (HDACi) AR-42, ameliorates the deficiency of adult neurogenesis in the granule cell layer of the dentate gyrus and rescues hippocampal memory defects in a mouse model of Kabuki syndrome (Kmt2d(+/βGeo)). Unlike a drug, a dietary intervention could be quickly transitioned to the clinic...
January 3, 2017: Proceedings of the National Academy of Sciences of the United States of America
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