Abstract:
:Excitatory and inhibitory neurotransmission in the central nervous system can be modulated by neurosteroids. We previously found that in rat hippocampal slices allopregnanolone (3α-hydroxy-5α-pregnan-20-one), a positive GABA(A) receptor modulator, suppresses the epileptic discharges induced by 4-aminopyridine (4-AP), a convulsant K(+) channel blocker that stimulates glutamate release. Here, we tested the action of allopregnanolone on the epileptogenic and excitotoxic effects of the intrahippocampal administration of 4-AP in vivo. Drugs were perfused by a microdialysis cannula-electrode in the dorsal hippocampus and the EEG was recorded. Extracellular levels of aspartate, glutamate and GABA were analyzed by HPLC in the microdialysis fractions, and 24 h after the experiment the hippocampus was studied histologically. 4-AP induced intense epileptic discharges, increased the extracellular levels of aspartate, glutamate, and GABA by 383, 420, and 245%, respectively, and produced a notable neurodegeneration in CA1 and CA3 areas. Allopregnanolone administration alone did not affect the electrical activity, amino acids levels or cellular morphology, but when co-infused with 4-AP incremented 55-77% the duration of the epileptic discharges, and potentiated 32-49% the release of glutamate in comparison with 4-AP alone. The 4-AP-induced neurodegeneration was not modified by allopregnanolone. The NMDA receptor antagonist MK-801 protected against the epilepsy and neurodegeneration produced by 4-AP, and allopregnanolone did not affect this protection. We conclude that, differently from the observations in vitro, allopregnanolone potentiated the stimulatory effect of 4-AP on glutamate release and that this may explain the potentiation of the epileptogenic effect of 4-AP in vivo.
journal_name
Neurochem Resjournal_title
Neurochemical researchauthors
Salazar P,Tapia Rdoi
10.1007/s11064-011-0649-1subject
Has Abstractpub_date
2012-03-01 00:00:00pages
596-603issue
3eissn
0364-3190issn
1573-6903journal_volume
37pub_type
杂志文章abstract::The aim of this study was to determine the anticancer potential of Leonurus sibiricus extract derived from in vitro transgenic roots transformed by Agrobacetrium rhizogenes with AtPAP1 transcriptional factor, and that of transformed roots without construct, on grade IV human glioma cells and the U87MG cell line, and a...
journal_title:Neurochemical research
pub_type: 杂志文章
doi:10.1007/s11064-018-2551-6
更新日期:2018-07-01 00:00:00
abstract::The activation of caspase-3 is considered to be a reliable marker for apoptotic cell death, and a 120-kDa fragment of αII-spectrin is generated by caspase-3 mediated cleavage of this structural protein. In the present study, we compared cleaved αII-spectrin (120-kDa) and cleaved caspase-3-immunoreactive cells and thei...
journal_title:Neurochemical research
pub_type: 杂志文章
doi:10.1007/s11064-011-0633-9
更新日期:2012-03-01 00:00:00
abstract::It is well known that the principal biomolecules involved in Alzheimer's disease (AD) are acetylcholinesterase (AChE), acetylcholine (ACh) and the amyloid beta peptide of 42 amino acid residues (Aβ42). ACh plays an important role in human memory and learning, but it is susceptible to hydrolysis by AChE, while the aggr...
journal_title:Neurochemical research
pub_type: 杂志文章
doi:10.1007/s11064-014-1400-5
更新日期:2014-11-01 00:00:00
abstract::Parkinson's disease (PD) is a common progressive neurodegenerative disorder, for which at present no causal treatment is available. On the understanding that the causes of PD are mainly oxidative stress and mitochondrial dysfunction, antioxidants and other drugs are expected to be used. In the present study, we demons...
journal_title:Neurochemical research
pub_type: 杂志文章
doi:10.1007/s11064-009-0046-1
更新日期:2010-02-01 00:00:00
abstract::Pathogens such as bacterial lipopolysaccharide (LPS) play an important role in promoting the production of the inflammatory cytokines interleukin-1 beta (IL-1β) and tumour necrosis factor-α (TNF-α) in response to infection or damage in microglia. However, whether different signalling pathways regulate these two inflam...
journal_title:Neurochemical research
pub_type: 杂志文章
doi:10.1007/s11064-019-02895-1
更新日期:2019-12-01 00:00:00
abstract::Leucine is rapidly metabolized in astroglial primary cultures. Therefore, it is considered as valuable fuel in brain energy metabolism. Only few of the leucine metabolites generated and released by astroglial cells have been identified. Therefore, a more detailed study was performed analyzing by NMR techniques the 13C...
journal_title:Neurochemical research
pub_type: 杂志文章
doi:10.1007/s11064-004-6879-8
更新日期:2004-11-01 00:00:00
abstract::Intracerebral hemorrhage (ICH) is an important public health problem in neurology, which is not only associated with high mortality but also leading to disability. Yet no satisfactory treatment has been developed. The secondary injury that resulted from a number of self-destructive processes such as neuroinflammation,...
journal_title:Neurochemical research
pub_type: 杂志文章
doi:10.1007/s11064-017-2179-y
更新日期:2017-05-01 00:00:00
abstract::Blood-brain barrier formed by brain capillary endothelial cells, being in contact with astrocytes endfeet and pericytes, separates extracellular fluid from plasma. Supply of necessary nutrients and removal of certain metabolites takes place due to the activity of transporting proteins from ABC (ATP binding cassette) a...
journal_title:Neurochemical research
pub_type: 杂志文章,评审
doi:10.1007/s11064-016-2030-x
更新日期:2017-03-01 00:00:00
abstract::In this study, we were interested to compare the responsiveness to growth factors, NGF, b-FGF and EGF and cytokines, IL1 beta, and TNF-alpha, in late passages (74-79) C6 glial cells committed astrocytes and astrocytes of advanced passages (26-28) in cultures derived from aged mouse cerebral hemispheres (MACH). Culture...
journal_title:Neurochemical research
pub_type: 杂志文章
doi:10.1007/BF02527760
更新日期:1996-05-01 00:00:00
abstract::The effects of chronic pentobarbital (PB) treatment on the binding characteristics of [3H]flunitrazepam (FLU) in rat brain were examined. Saline or sodium PB (500 micrograms/10 microliters/hr) was infused into the lateral cerebral ventricles of rats for 6 days using osmotic pumps. Immediately before withdrawal, there ...
journal_title:Neurochemical research
pub_type: 杂志文章
doi:10.1007/BF00966726
更新日期:1994-01-01 00:00:00
abstract::Insulin-like growth factor 1 (IGF-1) stimulates α-secretase processing of amyloid precursor protein (APP) and decreases Aβ production. Little is known about the relationship between IGF-1 and β-site amyloid precursor protein cleaving enzyme 1 (BACE-1), the protease essential for the production of β-amyloid peptides (A...
journal_title:Neurochemical research
pub_type: 杂志文章
doi:10.1007/s11064-010-0260-x
更新日期:2011-01-01 00:00:00
abstract::Age-related increase of reactive oxygen species (ROS) is particularly detrimental in postmitotic tissues. Calorie restriction (CR) has been shown to exert beneficial effects, consistent with reduced ROS generation by mitochondria. Many antioxidant compounds also mimic such effects. N-acetyl cysteine (NAC) provides thi...
journal_title:Neurochemical research
pub_type: 杂志文章
doi:10.1007/s11064-005-6867-7
更新日期:2005-06-01 00:00:00
abstract::Parkinson's disease (PD) is characterized by the presence of insoluble protein clusters containing α-synuclein. Impairment of mitochondria, endoplasmic reticulum, autophagy and intracellular trafficking proper function has been suggested to be caused by α-synuclein toxicity, which is also associated with the higher le...
journal_title:Neurochemical research
pub_type: 杂志文章,评审
doi:10.1007/s11064-018-2673-x
更新日期:2018-12-01 00:00:00
abstract::The characteristics and properties of the increase in cytosolic [Ca2+] that occurs in bovine adrenal medullary chromaffin cells on exposure to angiotensin 11 have been investigated. In fura-2 loaded cells exposure to a maximally effective concentration of angiotensin II (100 nM) caused a rapid, but transient increase ...
journal_title:Neurochemical research
pub_type: 杂志文章
doi:10.1023/a:1024987128090
更新日期:2003-09-01 00:00:00
abstract::To study the early effects of neonatal 5,7-dihydroxytryptamine lesions on 5-hydroxytryptamine1A (5-HT1A) receptors, we measured regional [3H]8-OH-DPAT-labeled 5-HT1A sites in binding assays and compared them to our previous studies of [3H]paroxetine-labeled 5-HT transporter sites during the first month in the same rat...
journal_title:Neurochemical research
pub_type: 杂志文章
doi:10.1007/BF00971579
更新日期:1994-03-01 00:00:00
abstract::Glutamine synthetase (GS) is the major glutamine-forming enzyme of vertebrates and is accepted to be a marker of astroglial cells. Maturation of astroglial cells is characterized by an increase of GS activity, and the regulation of this enzyme is the topic of many publications. Because of the fundamental role of the G...
journal_title:Neurochemical research
pub_type: 杂志文章
doi:10.1007/s11064-005-2754-5
更新日期:2005-05-01 00:00:00
abstract::The experiments reported in this paper address the hypothesis that [3H]leucine enkephalin labels both mu and delta receptors. As reported by other workers, this peptide dissociates from rat brain membranes in a biphasic manner. This is consistent with a two site binding model which hypothesizes that the peptide labels...
journal_title:Neurochemical research
pub_type: 杂志文章
doi:10.1007/BF00963918
更新日期:1983-02-01 00:00:00
abstract::Guanine nucleotides (GN) have been implicated in many intracellular mechanisms. Extracellular actions, probably as glutamate receptor antagonists, have also been recently attributed to these compounds. GN may have a neuroprotective role by inhibiting excitotoxic events evoked by glutamate. Effects of extracellular GN ...
journal_title:Neurochemical research
pub_type: 杂志文章
doi:10.1023/a:1007557600687
更新日期:2000-02-01 00:00:00
abstract::The adaptation of cells to hyperosmotic conditions involves accumulation of organic osmolytes to achieve osmotic equilibrium and maintenance of cell volume. The Na+ and Cl(-)-coupled betaine/GABA transporter, designated BGT-1, is responsible for the cellular accumulation of betaine and has been proposed to play a role...
journal_title:Neurochemical research
pub_type: 杂志文章
doi:10.1007/s11064-005-6879-3
更新日期:2005-06-01 00:00:00
abstract::Neuroprotective effects of metformin have been increasingly recognized in both diabetic and non-diabetic conditions. Thus far, no information has been available on the potential beneficial effects of metformin on peripheral nerve regeneration in diabetes mellitus. The present study was designed to investigate such a p...
journal_title:Neurochemical research
pub_type: 杂志文章
doi:10.1007/s11064-015-1803-y
更新日期:2016-05-01 00:00:00
abstract::In this study, we investigated if subunit displacement and/or alterations in proteasome biosynthesis are responsible for the changes in the levels of constitutive proteasomes (c-20S), immunoproteasomes (i-20S) and the activators PA28 and PA700 in neurons and astrocytes cultured with a cytokine mixture (IFN-γ/TNF-α/IL-...
journal_title:Neurochemical research
pub_type: 杂志文章
doi:10.1007/s11064-020-02958-8
更新日期:2020-04-01 00:00:00
abstract::The effects of neuroleptic treatments on dopamine transporters and on dopamine receptors was investigated in the forebrain of adult rats treated for 21 days with either haloperidol, clozapine or saline. The dopamine D1 receptors, labeled with [3H]SCH23390, increased in nucleus accumbens, latero-dorsal rostral neostria...
journal_title:Neurochemical research
pub_type: 杂志文章
doi:10.1023/a:1022405621365
更新日期:1998-01-01 00:00:00
abstract::Focal epileptic seizures can in some patients be managed by inhibiting γ-aminobutyric acid (GABA) uptake via the GABA transporter 1 (GAT1) using tiagabine (Gabitril®). Synergistic anti-seizure effects achieved by inhibition of both GAT1 and the betaine/GABA transporter (BGT1) by tiagabine and EF1502, compared to tiaga...
journal_title:Neurochemical research
pub_type: 杂志文章
doi:10.1007/s11064-020-03017-y
更新日期:2020-07-01 00:00:00
abstract::Traumatic brain injury (TBI) initiates a series of neurochemical and signaling changes that could eventually lead to neuronal apoptosis. Recent studies indicated that mature neurons cell cycle re-enter played a crucial role in neuronal apoptosis. In this study, we identified that the chaperonin containing TCP-1, subun...
journal_title:Neurochemical research
pub_type: 杂志文章
doi:10.1007/s11064-015-1683-1
更新日期:2015-09-01 00:00:00
abstract::Axonal regeneration across the site of spinal cord lesion is often aborted in adult mammalian species. The use of DNA vaccine to nullify the inhibitory molecules has been shown to be effective in promoting axonal regeneration in injured spinal cord. The possible molecular mechanisms, however, remain to be elucidated. ...
journal_title:Neurochemical research
pub_type: 杂志文章
doi:10.1007/s11064-009-9951-6
更新日期:2009-09-01 00:00:00
abstract::This study attempted to investigate the possible involvement of the brain stem noradrenergic system in the development of hypertension in spontaneously hypertensive rats. Steady-state norepinephrine, dopamine, serotonin and 5-hydroxyindoleacetic acid concentrations and norepinephrine turnover were determined in the in...
journal_title:Neurochemical research
pub_type: 杂志文章
doi:10.1007/BF00969761
更新日期:1989-01-01 00:00:00
abstract::The oxidation of pyruvate is mediated by the pyruvate dehydrogenase complex (PDHC; EC 1.2.4.1, EC 2.3.1.12 and EC 1.6.4.3) whose catalytic activity is influenced by phosphorylation and by product inhibition. 2-Oxoglutarate and 3-hydroxybutyrate are readily utilized by brain mitochondria and inhibit pyruvate oxidation....
journal_title:Neurochemical research
pub_type: 杂志文章
doi:10.1007/BF00970527
更新日期:1987-08-01 00:00:00
abstract::Subacute exposure to manganese (Mn) produced Parkinson's disease-like syndrome called Manganism. Chronic onset and progression are characteristics of Manganism, therefore, this study aimed to examine Mn toxicity following chronic exposures. Male Sprague-Dawley rats were injected Mn2+ 1 and 5 mg/kg, every 10 days for 1...
journal_title:Neurochemical research
pub_type: 杂志文章
doi:10.1007/s11064-020-03059-2
更新日期:2020-08-01 00:00:00
abstract::Glutamate is the major excitatory neurotransmitter in the mammalian central nervous system (CNS) and exerts its actions via a number of ionotropic glutamate receptors/channels and metabotropic glutamate (mGlu) receptors. In addition to being expressed in neurons, glutamate receptors are expressed in different types of...
journal_title:Neurochemical research
pub_type: 杂志文章,评审
doi:10.1007/s11064-008-9694-9
更新日期:2008-12-01 00:00:00
abstract::In this study, we observed the effects of metformin, one of the most widely prescribed drugs for the treatment of type 2 diabetes, on cell proliferation and neuroblast differentiation in the subgranular zone of the hippocampal dentate gyrus (SZDG) in Zucker diabetic fatty (ZDF) rats, which are a model for type 2 diabe...
journal_title:Neurochemical research
pub_type: 杂志文章
doi:10.1007/s11064-009-0115-5
更新日期:2010-04-01 00:00:00