keyword
MENU ▼
Read by QxMD icon Read
search

Schizophrenia CA1

keyword
https://www.readbyqxmd.com/read/28728089/volumetric-and-morphological-characteristics-of-the-hippocampus-are-associated-with-progression-to-schizophrenia-in-patients-with-first-episode-psychosis
#1
R Sauras, A Keymer, A Alonso-Solis, A Díaz, C Molins, F Nuñez, M Rabella, A Roldán, E Grasa, E Alvarez, M J Portella, I Corripio
BACKGROUND: Abnormalities in the hippocampus have been implicated in the pathophysiology of psychosis. However, it is still unclear whether certain abnormalities are a pre-existing vulnerability factor, a sign of disease progression or a consequence of environmental factors. We hypothesized that first-episode psychosis patients who progress to schizophrenia after one year of follow up will display greater volumetric and morphological changes from the very beginning of the disorder. METHODS: We studied the hippocampus of 41 patients with a first-episode psychosis and 41 matched healthy controls...
July 5, 2017: European Psychiatry: the Journal of the Association of European Psychiatrists
https://www.readbyqxmd.com/read/28505127/variability-of-dna-methylation-within-schizophrenia-risk-loci-across-subregions-of-human-hippocampus
#2
W Brad Ruzicka, Sivan Subburaju, Francine M Benes
Identification of 108 genomic regions significantly associated with schizophrenia risk by the Psychiatric Genomics Consortium was a milestone for the field, and much work is now focused on determining the mechanism of risk associated with each locus. Within these regions, we investigated variability of DNA methylation, a low-level cellular phenotype closely linked to genotype, in two highly similar cellular populations sampled from the human hippocampus, to draw inferences about the elaboration of genotype to phenotype within these loci enriched for schizophrenia risk...
May 15, 2017: Genes
https://www.readbyqxmd.com/read/28502262/effects-of-combined-iugr-and-prenatal-stress-on-the-development-of-the-hippocampus-in-a-fetal-guinea-pig-model
#3
A L Cumberland, H K Palliser, P Rani, D W Walker, J J Hirst
Intrauterine growth restriction (IUGR) and maternal stress during pregnancy are two compromises that negatively impact neurodevelopment and increase the risk of developing later life neuropsychiatric disorders such as schizophrenia, depression and behavioural disorders. Neurosteroids, particularly allopregnanolone, are important in protecting the developing brain and promoting many essential neurodevelopmental processes. Individually, IUGR and prenatal stress (PS) reduce myelination and neurogenesis within affected fetal brains, however less information is available on the combined effects of these two disorders on the term fetal brain...
May 15, 2017: Journal of Developmental Origins of Health and Disease
https://www.readbyqxmd.com/read/28433499/changes-in-the-expression-of-metabotropic-glutamate-receptor-5-mglur5-in-a-ketamine-based-animal-model-of-schizophrenia
#4
Dariusz Zurawek, Anna Salerno-Kochan, Marta Dziedzicka-Wasylewska, Agnieszka Nikiforuk, Tomasz Kos, Piotr Popik
It has been shown that the metabotropic glutamate receptor subtype 5 (mGluR5) is functionally associated with the NMDA subtype of the glutamate receptor family (NMDA receptors). These two receptors colocalize in brain regions associated with schizophrenia. Although the role of the NMDA receptor in cognitive and negative symptoms of schizophrenia is well studied, information about the role of mGluR5 receptors in schizophrenia is sparse. In our work, we show that subchronic administration of ketamine, a well-studied, non-competitive antagonist of NMDA receptors, caused cognitive deficits in rats as shown by testing novel object recognition (NOR)...
April 19, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/28422371/effects-of-m1-and-m4-activation-on-excitatory-synaptic-transmission-in-ca1
#5
Catherine A Thorn, Michael Popiolek, Eda Stark, Jeremy R Edgerton
Hippocampal networks are particularly susceptible to dysfunction in many neurodegenerative diseases and neuropsychiatric disorders including Alzheimer's disease, Lewy body dementia, and schizophrenia. CA1, a major output region of the hippocampus, receives glutamatergic input from both hippocampal CA3 and entorhinal cortex, via the Schaffer collateral (SC) and temporoammonic (TA) pathways, respectively. SC and TA inputs to CA1 are thought to be differentially involved in the retrieval of previously stored memories versus the encoding of novel information, and switching between these two crucial hippocampal functions is thought to critically depend on acetylcholine (ACh) acting at muscarinic receptors...
July 2017: Hippocampus
https://www.readbyqxmd.com/read/28371658/clinical-correlates-of-hippocampus-volume-and-shape-in-antipsychotic-na%C3%A3-ve-schizophrenia
#6
Sunil Vasu Kalmady, Venkataram Shivakumar, Rashmi Arasappa, Aditi Subramaniam, S Gautham, Ganesan Venkatasubramanian, Bangalore N Gangadhar
While volume deficit of hippocampus is an established finding in schizophrenia, very few studies have examined large sample of patients without the confounding effect of antipsychotic treatment. Concurrent evaluation of hippocampus shape will offer additional information on the hippocampal aberrations in schizophrenia. In this study, we analyzed the volume and shape of hippocampus in antipsychotic-naïve schizophrenia patients (N=71) in comparison to healthy controls (N=82). Using 3-T MRI data, gray matter (GM) volume (anterior and posterior sub-divisions) and shape of the hippocampus were analyzed...
March 29, 2017: Psychiatry Research
https://www.readbyqxmd.com/read/28302570/hippocampal-endothelin-1-decreases-excitability-of-pyramidal-neurons-and-produces-anxiolytic-effects
#7
Ming Chen, Shu Shu, Huan-Huan Yan, Lei Pei, Ze-Fen Wang, Qi Wan, Lin-Lin Bi
Anxiety disorders contribute to the pathophysiology of psychiatric diseases, including major depression, substance abuse, and schizophrenia. The hippocampus is important for anxiety modulation. However, the mechanisms that control the neuronal activity of the hippocampus in anxiety are still not clear. We found that Endothelin-1 (ET1) mRNA in the hippocampus was down-regulated in high-anxiety mice. Neutralizing endogenous ET1 in the hippocampal CA1 enhanced anxiety-like behaviors. We next revealed that most expression of ET1 and its receptors in the CA1 takes place in pyramidal neurons, and the ET1 signaling pathway directly regulated the excitability of CA1 pyramidal neurons and glutamatergic synaptic neurotransmission...
May 15, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28214898/early-development-of-parvalbumin-somatostatin-and-cholecystokinin-expressing-neurons-in-rat-brain-following-prenatal-immune-activation-and-maternal-iron-deficiency
#8
Patricia Boksa, Ying Zhang, Dominique Nouel, Alice Wong, Tak Pan Wong
Prenatal maternal infection and maternal iron deficiency during pregnancy are 2 early environmental insults associated with increased risk for schizophrenia in offspring. Substantial evidence suggests that abnormalities in inhibitory γ-aminobutyric acid (GABA) interneuron function, especially in the parvalbumin subtype of GABA interneuron, both developmentally and in adulthood, may contribute mechanistically to cognitive deficits and psychotic symptoms in schizophrenia. This study used a rat model to test whether prenatal immune activation with lipopolysaccharide (LPS; at gestation days, GD, 15 and 16) or maternal iron deficiency (from GD2 to postnatal day P7) or the combination of both insults alters major subtypes of GABAergic interneurons (parvalbumin, somatostatin, cholecystokinin) in brain regions relevant to schizophrenia (medial and dorsolateral prefrontal cortex [PFC], hippocampal CA1 and dentate gyrus, ventral subiculum) in offspring at P14 or P28...
2016: Developmental Neuroscience
https://www.readbyqxmd.com/read/28213444/the-dendrites-of-ca2-and-ca1-pyramidal-neurons-differentially-regulate-information-flow-in-the-cortico-hippocampal-circuit
#9
Kalyan V Srinivas, Eric W Buss, Qian Sun, Bina Santoro, Hiroto Takahashi, Daniel A Nicholson, Steven A Siegelbaum
The impact of a given neuronal pathway depends on the number of synapses it makes with its postsynaptic target, the strength of each individual synapse and the integrative properties of the postsynaptic dendrites. Here we explore the cellular and synaptic mechanisms responsible for the differential excitatory drive from the entorhinal cortical pathway onto mouse CA2 compared to CA1 pyramidal neurons (PNs). Although both types of neurons receive direct input from entorhinal cortex onto their distal dendrites, these inputs produce a 5-6 fold larger excitatory postsynaptic potential (EPSP) at the soma of CA2 compared to CA1 PNs, which is sufficient to drive action potential output from CA2 but not CA1...
February 17, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28193301/hippocampal-subregion-volume-changes-associated-with-antipsychotic-treatment-in-first-episode-psychosis
#10
K Rhindress, D G Robinson, J A Gallego, R Wellington, A K Malhotra, P R Szeszko
BACKGROUND: Hippocampal dysfunction is considered central to many neurobiological models of schizophrenia, yet there are few longitudinal in vivo neuroimaging studies that have investigated the relationship between antipsychotic treatment and morphologic changes within specific hippocampal subregions among patients with psychosis. METHOD: A total of 29 patients experiencing a first episode of psychosis with little or no prior antipsychotic exposure received structural neuroimaging examinations at illness onset and then following 12 weeks of treatment with either risperidone or aripiprazole in a double-blind randomized clinical trial...
February 14, 2017: Psychological Medicine
https://www.readbyqxmd.com/read/28079061/progressive-decline-in-hippocampal-ca1-volume-in-individuals-at-ultra-high-risk-for-psychosis-who-do-not-remit-findings-from-the-longitudinal-youth-at-risk-study
#11
New Fei Ho, Daphne J Holt, Mike Cheung, Juan Eugenio Iglesias, Alex Goh, Mingyuan Wang, Joseph Kw Lim, Joshua de Souza, Joann S Poh, Yuen Mei See, Alison R Adcock, Stephen J Wood, Michael Wl Chee, Jimmy Lee, Juan Zhou
Most individuals identified as ultra-high-risk (UHR) for psychosis do not develop frank psychosis. They continue to exhibit subthreshold symptoms, or go on to fully remit. Prior work has shown that the volume of CA1, a subfield of the hippocampus, is selectively reduced in the early stages of schizophrenia. Here we aimed to determine whether patterns of volume change of CA1 are different in UHR individuals who do or do not achieve symptomatic remission. Structural MRI scans were acquired at baseline and at 1-2 follow-up time points (at 12-month intervals) from 147 UHR and healthy control subjects...
May 2017: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28059046/long-term-effects-of-aripiprazole-exposure-on-monoaminergic-and-glutamatergic-receptor-subtypes-comparison-with-cariprazine
#12
Yong Kee Choi, Nika Adham, Béla Kiss, István Gyertyán, Frank I Tarazi
OBJECTIVE: This study examined the chronic effects of aripiprazole and cariprazine on serotonin (5-HT1A and 5-HT2A) and glutamate (NMDA and AMPA) receptor subtypes. In addition, the effects of aripiprazole on D2 and D3 receptors were tested and compared with previously reported cariprazine data. METHODS: Rats received vehicle, aripiprazole (2, 5, or 15 mg/kg), or cariprazine (0.06, 0.2, or 0.6 mg/kg) for 28 days. Receptor levels were quantified using autoradiographic assays on brain sections from the medial prefrontal cortex (MPC), dorsolateral frontal cortex (DFC), nucleus accumbens (NAc), caudate-putamen medial (CPu-M), caudate-putamen lateral (CPu-L), hippocampal CA1 (HIPP-CA1) and CA3 (HIPP-CA3) regions, and the entorhinal cortex (EC)...
January 6, 2017: CNS Spectrums
https://www.readbyqxmd.com/read/27911756/activation-of-group-ii-metabotropic-glutamate-receptors-promotes-ltp-induction-at-schaffer-collateral-ca1-pyramidal-cell-synapses-by-priming-nmda-receptors
#13
Nadia Rosenberg, Urs Gerber, Jeanne Ster
It is well established that selective activation of group I metabotropic glutamate (mGlu) receptors induces LTD of synaptic transmission at Schaffer collateral-CA1 synapses. In contrast, application of 1S,3R-ACPD, a mixed agonist at group I and group II mGlu receptors, induces LTP. Using whole-cell recordings from CA1 pyramidal cells and field recordings in the hippocampal CA1 region, we investigated the specific contribution of group II mGlu receptors to synaptic plasticity at Schaffer collateral-CA1 synapses in acute slices of adult mice...
November 9, 2016: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/27897969/satb2-determines-mirna-expression-and-long-term-memory-in-the-adult-central-nervous-system
#14
Clemens Jaitner, Chethan Reddy, Andreas Abentung, Nigel Whittle, Dietmar Rieder, Andrea Delekate, Martin Korte, Gaurav Jain, Andre Fischer, Farahnaz Sananbenesi, Isabella Cera, Nicolas Singewald, Georg Dechant, Galina Apostolova
SATB2 is a risk locus for schizophrenia and encodes a DNA-binding protein that regulates higher-order chromatin configuration. In the adult brain Satb2 is almost exclusively expressed in pyramidal neurons of two brain regions important for memory formation, the cerebral cortex and the CA1-hippocampal field. Here we show that Satb2 is required for key hippocampal functions since deletion of Satb2 from the adult mouse forebrain prevents the stabilization of synaptic long-term potentiation and markedly impairs long-term fear and object discrimination memory...
November 29, 2016: ELife
https://www.readbyqxmd.com/read/27866902/the-atypical-antipsychotic-olanzapine-disturbs-depotentiation-by-modulating-machrs-and-impairs-reversal-learning
#15
Woo Seok Song, Jin Hee Cha, Sang Ho Yoon, Young Seon Cho, Kyeong-Yeol Park, Myoung-Hwan Kim
Antipsychotic medication is an essential component for treating schizophrenia, which is a serious mental disorder that affects approximately 1% of the global population. Olanzapine (Olz), one of the most frequently prescribed atypical antipsychotics, is generally considered a first-line drug for treating schizophrenia. In contrast to psychotic symptoms, the effects of Olz on cognitive symptoms of schizophrenia are still unclear. In addition, the mechanisms by which Olz affects the neural circuits associated with cognitive function are unknown...
March 1, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/27833555/ginkgolic-acid-protects-against-a%C3%AE-induced-synaptic-dysfunction-in-the-hippocampus
#16
Dalila Mango, Filippo Weisz, Robert Nisticò
Ginkgo leaf is the most used form of supplement for cognitive ailments. The standardized extract formulation EGb 761 is a dietary supplement with proven benefit in several neurological and psychiatric conditions including memory decline in Alzheimer's disease, schizophrenia and dementia. Ginkgolic acid (GA) is a component of this extract which shows pleiotropic effects including antitumoral and anti-HIV action; however, its effect on memory is still unknown. Here, we carried out an electrophysiological analysis to investigate the effects of GA on long term potentiation and synaptic transmission at CA1 hippocampal synapses...
2016: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/27824119/intake-of-7-8-dihydroxyflavone-during-juvenile-and-adolescent-stages-prevents-onset-of-psychosis-in-adult-offspring-after-maternal-immune-activation
#17
Mei Han, Ji-Chun Zhang, Wei Yao, Chun Yang, Tamaki Ishima, Qian Ren, Min Ma, Chao Dong, Xu-Feng Huang, Kenji Hashimoto
Prenatal infection and subsequent abnormal neurodevelopment of offspring is involved in the etiology of schizophrenia. Brain-derived neurotrophic factor (BDNF) and its high affinity receptor, tropomyosin receptor kinase B (TrkB) signaling plays a key role in the neurodevelopment. Pregnant mice exposed to polyriboinosinic-polyribocytidylic acid [poly(I:C)] causes schizophrenia-like behavioral abnormalities in their offspring at adulthood. Here we found that the juvenile offspring of poly(I:C)-treated mice showed cognitive deficits, as well as reduced BDNF-TrkB signaling in the prefrontal cortex (PFC)...
November 8, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27806441/acute-systemic-mk-801-induced-functional-uncoupling-between-hippocampal-areas-ca3-and-ca1-with-distant-effect-in-the-retrosplenial-cortex
#18
Helena Buchtová, Iveta Fajnerová, Aleš Stuchlík, Štěpán Kubík
The hippocampus and retrosplenial cortex are integrated within a higher-order cognitive circuit supporting relational (spatial, contextual, episodic) forms of learning and memory. Hippocampal place cells can coordinate multiple parallel representations in the same physical environment. Novel environment exploration triggers expression of immediate-early genes (IEGs) Arc and Homer1a in spatial context-specific ensembles of CA1 and CA3 neurons. Less is know about ensemble coding in the retrosplenial cortex (RSC), a region directly connected and functionally coupled to CA1...
November 2, 2016: Hippocampus
https://www.readbyqxmd.com/read/27784625/nicotine-induced-neuroplasticity-counteracts-the-effect-of-schizophrenia-linked-neuregulin-1-signaling-on-nmdar-function-in-the-rat-hippocampus
#19
Yoshihiko Yamazaki, Katumi Sumikawa
A high rate of heavy tobacco smoking among people with schizophrenia has been suggested to reflect self-medication and amelioration of cognitive dysfunction, a core feature of schizophrenia. NMDAR hypofunction is hypothesized to be a mechanism of cognitive dysfunction, and excessive schizophrenia-linked neuregulin 1 (NRG1) signaling through its receptor ErbB4 can suppress NMDAR function by preventing Src-mediated enhancement of NMDAR responses. Here we investigated whether chronic nicotine exposure in rats by subcutaneous injection of nicotine (0...
February 2017: Neuropharmacology
https://www.readbyqxmd.com/read/27729083/disrupted-in-schizophrenia1-disc1-l100p-mutation-alters-synaptic-transmission-and-plasticity-in-the-hippocampus-and-causes-recognition-memory-deficits
#20
Lin Cui, Wei Sun, Ming Yu, Nan Li, Li Guo, Huating Gu, Yu Zhou
Disrupted-in-schizophrenia 1(DISC1) is a promising candidate susceptibility gene for a spectrum of psychiatric illnesses that share cognitive impairments in common, including schizophrenia, bipolar disorder and major depression. Here we report that DISC1 L100P homozygous mutant shows normal anxiety- and depression-like behavior, but impaired object recognition which is prevented by administration of atypical antipsychotic drug clozapine. Ca(2+) image analysis reveals suppression of glutamate-evoked elevation of cytoplasmic [Ca(2+)] in L100P hippocampal slices...
October 12, 2016: Molecular Brain
keyword
keyword
94657
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"