Abstract：
:Primary cultures of cerebral cortical astrocytes and neurons, as well as neurons growing on top of the astrocytes (sandwich co-cultures), were incubated with 1-[13C]glucose or 2-[13C]acetate and in the presence or absence of the glutamine synthetase inhibitor methionine sulfoximine. [13C]NMR spectroscopy at 125 MHz was performed on perchloric acid extracts of the cells or on media collected from the cultures. In addition, the [13C/12C] ratios of the amino acids glutamine, glutamate and 4-aminobutyrate (GABA) were determined by gas chromatography/mass spectroscopy, showing a larger degree of labeling in GABA than in glutamate and glutamine from glucose. Glutamine and glutamate were predominantly labeled from acetate. A picture of cellular metabolism mainly regarding the tricarboxylic acid cycle and glycolysis was obtained. Due to the fact that acetate is not metabolized by neurons to any significant extent, it could be shown that precursors from astrocytes are incorporated into the GABA pool of neurons grown in co-culture with astrocytes. Spectra of media removed from these cultures revealed that likely precursor candidates for GABA were glutamine and citrate. The importance of glutamine is further substantiated by the finding that inhibition of glutamine synthetase, an enzyme present in astrocytes only, significantly decreased the labeling of GABA in co-cultures incubated with 2-[13C]acetate.
journal_name
Neurochem Intjournal_title
Neurochemistry internationalauthors
Sonnewald U,Westergaard N,Schousboe A,Svendsen JS,Unsgård G,Petersen SBdoi
10.1016/0197-0186(93)90064-csubject
Has Abstractpub_date
1993-01-01 00:00:00pages
19-29issue
1eissn
0197-0186issn
1872-9754journal_volume
22pub_type
杂志文章abstract：:The saturable and specific high-affinity uptake of [(3)H]serotonin ([(3)H]5HT) (5 x 10(?8) M) was studied in slices from the hippocampus, parietal cortex, septum-preoptic area, and hypothalamus of male 2, 6, 12 and 24-32 month old C57BL/6N mice. Hippocampal [(3)H]5-HT uptake showed a significant biphasic relationship ...
journal_title：Neurochemistry international
pub_type： 杂志文章
doi：10.1016/0197-0186(83)90006-2
更新日期：1983-01-01 00:00:00
abstract：:This paper describes the background in experiment and theory on which present-day studies of the biochemistry of learning and memory are based. It then reviews specifically the use of passive avoidance training in the day-old chick as a model for the analysis of the cellular events associated with memory-formation. It...
journal_title：Neurochemistry international
pub_type： 杂志文章
doi：10.1016/0197-0186(89)90055-7
更新日期：1989-01-01 00:00:00
abstract：:Acetylcholinesterase (AChE) hydrolyses acetylcholine to choline and acetate, playing an important role in terminating the neurotransmission in brain and muscle. Recently, the non-neuronal functions of AChE have been proposed in different tissues, in which there are various factors to regulate the expression of AChE. I...
journal_title：Neurochemistry international
pub_type： 杂志文章
doi：10.1016/j.neuint.2020.104861
更新日期：2020-12-01 00:00:00
abstract：:The concentrations of histamine reported vary considerably from species to species. The present studies sought to determine if blood sampling techniques were at least in part responsible for this large variability. Since plasma catecholamines are influenced by the stress associated with blood sampling, these biogenic ...
journal_title：Neurochemistry international
pub_type： 杂志文章
doi：10.1016/0197-0186(85)90171-8
更新日期：1985-01-01 00:00:00
abstract：:The concentrations of gamma-glutamylglutamate, gamma-glutamylglutamine, gamma-glutamylcysteine, glutamate, aspartate, glutamine, cyst(e)ine and glutathione (including disulfides) were determined by HPLC analysis of both the tissue and the surrounding medium of incubated rat hippocampal slices. High potassium concentra...
journal_title：Neurochemistry international
pub_type： 杂志文章
doi：10.1016/0197-0186(95)00148-4
更新日期：1996-08-01 00:00:00
abstract：:Thromboxane A2(TxA2) is a potent vasoconstrictor associated with cerebrovascular disease and is thought to be synthesized within tissues of the brain. In order to determine the cellular sources of TxA2 in the central nervous system (CNS), we measured the release of the stable metabolite TxB2 in cultures of mixed or hi...
journal_title：Neurochemistry international
pub_type： 杂志文章
doi：10.1016/0197-0186(95)00140-9
更新日期：1996-07-01 00:00:00
abstract：:Several endogenous brain substances which inhibit [3H]muscimol binding were isolated, and one of them has been purified to apparent homogeneity. The purification involved the extraction of brain tissue with water, followed by several steps of gel filtration column chromatography and high performance liquid chromatogra...
journal_title：Neurochemistry international
pub_type： 杂志文章
doi：10.1016/0197-0186(93)90134-q
更新日期：1993-11-01 00:00:00
abstract：BACKGROUND AND METHODS:Glycine receptor (GlyR) consists of two α (1-4) and three β subunits. Considerable evidence indicates that the adult retina expresses the four types of α subunits; however, the proportion of these subunits in adult and immature retina is almost unknown. In this report we have studied mRNA and the...
journal_title：Neurochemistry international
pub_type： 杂志文章
doi：10.1016/j.neuint.2017.03.013
更新日期：2017-09-01 00:00:00
abstract：:The ketogenic diet (KD) is used for the treatment of refractory epilepsy in children, however, the mechanism(s) remains largely unknown. Also, the antiepileptogenic potential in animal models of epilepsy has been poorly addressed. Activation of cannabinoid type-1 receptor (CB(1)-R) upon seizure activity may mediate ne...
journal_title：Neurochemistry international
pub_type： 杂志文章
doi：10.1016/j.neuint.2008.10.012
更新日期：2009-03-01 00:00:00
abstract：:The present study confirmed our previous assumption on the crucial role of central alpha2B-like adrenoceptor subtype in gastric mucosal defense. It was found that beside clonidine, rilmenidine, an alpha2/imidazoline receptor agonist and ST-91, an alpha2B-adrenoceptor preferring agonist inhibited the mucosal lesions in...
journal_title：Neurochemistry international
pub_type： 杂志文章
doi：10.1016/j.neuint.2007.07.001
更新日期：2007-10-01 00:00:00
abstract：:Na+-dependent uptake of excitatory neurotransmitter glutamate in astrocytes increases cell energy demands primarily due to the elevated ATP consumption by glutamine synthetase and Na+, K+-ATPase. The major pool of GLAST/EAAT1, the only glutamate transporter subtype expressed by human fetal astrocytes in undifferentiat...
journal_title：Neurochemistry international
pub_type： 杂志文章
doi：10.1016/j.neuint.2006.12.015
更新日期：2007-06-01 00:00:00
abstract：:Uridine was administered in the drinking water (0.5 mg/ml) in adult 6 month-old rats for 6 months. The mean daily dose of uridine was 12.5 mg/rat. The effects of this treatment on tyrosine hydroxylase, galanin, somatostatin, neuropeptide Y and cholecystokinin-like immunoreactivities were studied by means of semiquanti...
journal_title：Neurochemistry international
pub_type： 杂志文章
doi：10.1016/0197-0186(88)90081-2
更新日期：1988-01-01 00:00:00
abstract：:A sandwich enzyme immunoassay (EIA) was established by using purified human serum dopamine-?-hydroxylase (DBH) as a standard protein and a monospecific polyclonal antibody raised against human DBH purified from human pheochromocytoma. The EIA was applied to measuring DBH levels in human CSF from Parkinsonian patients ...
journal_title：Neurochemistry international
pub_type： 杂志文章
doi：10.1016/0197-0186(88)90126-x
更新日期：1988-01-01 00:00:00
abstract：:Sprague-Dawley rats were made chronically vitamin D deficient (VDD) and hypocalcemic, or VDD and normocalcemic. Rickets, severely reduced body weight, hair shedding, lethargy, muscular paralysis and a high mortality rate are characteristic features of the male VDD/hypocalcemic animals. An assessment was made of the ne...
journal_title：Neurochemistry international
pub_type： 杂志文章
doi：10.1016/0197-0186(91)90192-g
更新日期：1991-01-01 00:00:00
abstract：:The relative abilities of a series of local anesthetics in which either or both the ester oxygens had been replaced with sulfur or selenium to block axonal or synaptic preparations are compared with their abilities to displace (3)H-nicotine from lobster axon plasma membrane fragments. The relative affinities of a seri...
journal_title：Neurochemistry international
pub_type： 杂志文章
doi：10.1016/0197-0186(80)90011-x
更新日期：1980-01-01 00:00:00
abstract：:Excitable membranes appear to be biochemically characterized by the presence of a highly specific receptor protein, which undergoes conformational changes upon stimulation and returns to its original conformation for renewed excitability. Our present knowledge of the disk membrane and its receptor protein rhodopsin is...
journal_title：Neurochemistry international
pub_type： 杂志文章
doi：10.1016/0197-0186(80)90085-6
更新日期：1980-01-01 00:00:00
abstract：:The protein kinase C (PKC) family of serine/threonine kinase isoenzymes are universally expressed in vertebrate tissues where they control vital cellular functioning. PKC comprises twelve currently identified mammalian isoenzymes, described in three distinct groups according to their need for different effector stimul...
journal_title：Neurochemistry international
pub_type： 杂志文章,评审
doi：10.1016/s0197-0186(96)00049-6
更新日期：1997-02-01 00:00:00
abstract：:An endogenous Na+, K+-ATPase inhibitor termed endobain E has been isolated from rat brain which shares several biological properties with ouabain. This cardiac glycoside possesses neurotoxic properties attributable to Na+, K+-ATPase inhibition, which leads to NMDA receptor activation, thus supporting the concept that ...
journal_title：Neurochemistry international
pub_type： 杂志文章
doi：10.1016/s0197-0186(01)00034-1
更新日期：2001-10-01 00:00:00
abstract：:Insulin receptors from rat brain regions were studied for insulin binding and receptor associated kinase activity, in alloxan induced short-term and long-term diabetes, and insulin induced hypoglycemia. Insulin receptor activity was assessed by [125I]insulin binding, and basal as well as insulin stimulated kinase acti...
journal_title：Neurochemistry international
pub_type： 杂志文章
doi：10.1016/0197-0186(92)90027-o
更新日期：1992-06-01 00:00:00
abstract：:The effect of the N-methylisoquinolinium ion (NMIQ(+)) on the activity of enzymes related to metabolism of dopamine was studied using a rat clonal pheochromocytoma PC12h cell line. The activities of tyrosine hydroxylase (TH), aromatic l-amino acid decarboxylase (AADC) and monoamine oxidase (MAO) were inhibited by NMIQ...
journal_title：Neurochemistry international
pub_type： 杂志文章
doi：10.1016/0197-0186(89)90138-1
更新日期：1989-01-01 00:00:00
abstract：:The use of synthetic antisense oligonucleotides as specific inhibitors of gene expression exploits the susceptibility of mRNA to functional blockade at several levels, including mRNA processing, transport, translation and degradation. It is becoming increasingly apparent that the actions of these synthetic oligomers a...
journal_title：Neurochemistry international
pub_type： 杂志文章,评审
doi：10.1016/s0197-0186(96)00108-8
更新日期：1997-09-01 00:00:00
abstract：:Rabbit retinas were maintained in vitro in medium resembling cerebrospinal fluid and were exposed to (3)H-leucine or (14)C-leucine in double-labeling experiments designed to measure rates of protein turnover and to determine the effects of photic stimulation on protein synthesis and degradation. The retinas were solub...
journal_title：Neurochemistry international
pub_type： 杂志文章
doi：10.1016/0197-0186(80)90075-3
更新日期：1980-01-01 00:00:00
abstract：:Brain edema and the subsequent increase in intracranial pressure are the major neurological complications in fulminant hepatic failure (FHF). Brain edema in FHF is predominantly "cytotoxic" due principally to astrocyte swelling. It is generally believed that ammonia plays a key role in this process, although the mecha...
journal_title：Neurochemistry international
pub_type： 杂志文章
doi：10.1016/j.neuint.2005.11.017
更新日期：2006-05-01 00:00:00
abstract：:The morphological differentiation of normal rat glioblasts induced by glia maturation factor (GMF) was investigated with regard to the reorganization of the cytoskeletal structures by the use of indirect immunofluorescence staining methods. The microfilaments were reorganized from a stress fiber form to a plasmalemmal...
journal_title：Neurochemistry international
pub_type： 杂志文章
doi：10.1016/0197-0186(90)90080-d
更新日期：1990-01-01 00:00:00
abstract：:The ultrastructural localization of AChE and BuChE was studied in motor endplates of the rat and mouse diaphragms, using the CNS(?) modification of the one-step Cu-thiocholine procedure. AChE activity was observed on pre- and postsynaptic membranes, in the basal lamina and in the Schwann cell-nerve terminal interspace...
journal_title：Neurochemistry international
pub_type： 杂志文章
doi：10.1016/0197-0186(80)90021-2
更新日期：1980-01-01 00:00:00
abstract：:The activity of histochemically demonstrable aspartate aminotransferase was measured histophotometrically in the hippocampal formation, in dorsal root ganglia, and in superior cervical ganglia during postnatal development of the rat. The enzyme activity showed a marked (up to 15 times) increase in the dendritic layers...
journal_title：Neurochemistry international
pub_type： 杂志文章
doi：10.1016/0197-0186(87)90146-x
更新日期：1987-01-01 00:00:00
abstract：:Essential metals are crucial for the maintenance of cell homeostasis. Among the 23 elements that have known physiological functions in humans, 12 are metals, including iron (Fe) and manganese (Mn). Nevertheless, excessive exposure to these metals may lead to pathological conditions, including neurodegeneration. Simila...
journal_title：Neurochemistry international
pub_type： 杂志文章,评审
doi：10.1016/j.neuint.2012.12.006
更新日期：2013-04-01 00:00:00
abstract：:We have previously reported that, unlike their rat counterparts, the survival of mouse cerebellar granule cells is independent of chronic stimulation whether owing to elevated K(+)-induced depolarization or NMDA (N-methyl-D-aspartate) receptor activation. One explanation could be that during the critical period mouse ...
journal_title：Neurochemistry international
pub_type： 杂志文章
doi：10.1016/0197-0186(96)00018-6
更新日期：1996-11-01 00:00:00
abstract：:The oligosaccharides of rod and cone membranes were investigated with the aid of fluorescence and (125)I-labeled lectins. Additionally, the ability of lectins to cause agglutination in ROS suspensions was used as an index for the presence of the corresponding lectin receptors. The specificities of lectin-ligand intera...
journal_title：Neurochemistry international
pub_type： 杂志文章
doi：10.1016/0197-0186(80)90065-0
更新日期：1980-01-01 00:00:00
abstract：:The effects of hypoxia on the metabolism of the central nervous system were investigated in rats submitted to a low oxygen atmosphere (8% O(2); 92% N(2)). [1-(13)C]glucose and [2-(13)C]acetate were used as substrates, this latter being preferentially metabolized by glial cells. After 1-h substrate infusion, the incorp...
journal_title：Neurochemistry international
pub_type： 杂志文章
doi：10.1016/s0197-0186(00)00106-6
更新日期：2001-04-01 00:00:00
