Abstract：
:The conversion of phosphoethanolamine to phosphocholine requires 3 separate N-methyltransferases. We had previously purified the enzyme catalyzing the last methylation, phosphodimethylethanolamine N-methyltransferase. We have successfully purified the enzyme catalyzing the initial methylation of phosphoethanolamine. A 434 fold purified enzyme from rat brain was obtained by the sequential use of ammonium sulfate fractionation, Q-Sepharose fast flow column chromatography and a omega-aminoethyl agarose column chromatography. The pH optimum was 11 or greater, the Km value for phosphoethanolamine was 167.8 +/- 41.7 microM and the Vmax was 487.3 +/- 85 mmoles/mg/hr. The kinetics for S-adenosyl-methionine, the methyldonor, has characteristics of cooperative binding with a Km of 1.805 +/- 0.59 mM and a Vmax of 16.9 +/- 3.6 mumoles/mg/hr. The activity was stimulated 6 fold by 2.5 mM MnCl2 and inhibited by DZA and S-adenosylhomocysteine. These results reinforce the early in vivo observations which had provided suggestive evidence for the existence of a pathway for the methylation of phosphoethanolamine to phosphocholine in rat brain.
journal_name
Neurochem Resjournal_title
Neurochemical researchauthors
Mukherjee S,Freysz L,Kanfer JNdoi
10.1007/BF00995388subject
Has Abstractpub_date
1995-10-01 00:00:00pages
1233-7issue
10eissn
0364-3190issn
1573-6903journal_volume
20pub_type
杂志文章abstract：:Pathophysiological concentrations of branched chain keto-acids (BCKAs), such as those that occur in maple syrup urine disease, inhibit oxygen consumption in liver homogenates and brain slices and the enzymatic activity of alpha-ketoglutarate- and pyruvate dehydrogenase complexes. Consistent with previous work, studies...
journal_title：Neurochemical research
pub_type： 杂志文章
doi：10.1007/s11064-007-9291-3
更新日期：2007-04-01 00:00:00
abstract：:The dorsal raphe nucleus (DRN) has been suggested playing an important role in the pathophysiology of post-traumatic stress disorder (PTSD), however the underlying cellular mechanisms are not fully understood. The endoplasmic reticulum (ER) is a critical organelle for synthesis of membrane and secretory proteins, and ...
journal_title：Neurochemical research
pub_type： 杂志文章
doi：10.1007/s11064-014-1262-x
更新日期：2014-04-01 00:00:00
abstract：:Experimentalists would like to perform large-scale expression analysis on samples drawn from small cell populations and even single cells. Amplification of the source material is required to assay such small samples under all existing array technologies. In this report we consider the very different theoretical proper...
journal_title：Neurochemical research
pub_type： 杂志文章
doi：10.1023/a:1020917223962
更新日期：2002-10-01 00:00:00
abstract：:N-terminal protein arginylation has been demonstrated in vitro and in situ and has been reported to increase following injury to sciatic nerves of rats. The present study attempts to demonstrate these reactions in vivo by applying [3H]Arg to the cut end of sciatic nerves in anesthetized rats and assaying for N-termina...
journal_title：Neurochemical research
pub_type： 杂志文章
doi：10.1023/a:1021998227237
更新日期：1997-12-01 00:00:00
abstract：:Quantitative measurements were made of choline acetyltransferase (CAT) activity, acetylcholinesterase (AChE) activity and cholinergic muscarinic receptor binding ([3H]QNB) in eight areas of a cross-section of the rat medulla oblongata. A fourth cholinergic parameter, high-affinity choline uptake, was measured in three...
journal_title：Neurochemical research
pub_type： 杂志文章
doi：10.1007/BF00964389
更新日期：1981-05-01 00:00:00
abstract：:The endogenous sialidase (N-acetylneuraminidase) activity of membranes prepared from goldfish retina and optic tectum displays characteristics similar to those reported for neural plasma membrane sialidases of other organisms. Endogenous membrane sialidase activity was found to be optimal at ph 4.0, and maximal releas...
journal_title：Neurochemical research
pub_type： 杂志文章
doi：10.1007/BF00965657
更新日期：1983-01-01 00:00:00
abstract：:This review presents data on metabotropic uridine nucleotide receptor subtypes (P2UR) activated by UTP, sometimes also by UDP and/or ATP. Some chemical details of receptor subtypes and ligand interactions are described. Ligand-activated P2UR subtypes may couple to different second messengers, yet little is known about...
journal_title：Neurochemical research
pub_type： 杂志文章,评审
doi：10.1023/a:1022487128766
更新日期：1997-08-01 00:00:00
abstract：:Mice with a heterozygous knock-out of the myelin protein P0 gene (P0+/-) develop a neuropathy similar to human Charcot-Marie-Tooth disease. They are indistinguishable from wild-types (WT) at birth and develop a slowly progressing demyelinating neuropathy. The aim of this study was to investigate whether the regenerati...
journal_title：Neurochemical research
pub_type： 杂志文章
doi：10.1007/s11064-013-1030-3
更新日期：2013-06-01 00:00:00
abstract：:Spinal cord injury (SCI) is a type of long-term disability with a high morbidity rate in clinical settings for which there is no effective clinical treatment to date. Usually, lithium is used as a popular mood stabilizer. Recently, growing evidence has shown that lithium has clear neuroprotective effects after SCI, an...
journal_title：Neurochemical research
pub_type： 杂志文章
doi：10.1007/s11064-018-2488-9
更新日期：2018-04-01 00:00:00
abstract：:A very large body of evidence from in vivo studies has been accumulated on a link between the change of energy and cell survival/apoptosis. Using an in vitro ischemia model, we have previously shown that ischemia could induce apoptosis in astrocytes. In this study, we utilized the same in vitro model to investigate ch...
journal_title：Neurochemical research
pub_type： 杂志文章
doi：10.1023/a:1021691112190
更新日期：2002-12-01 00:00:00
abstract：:Schwann cell biosynthesis of glycolipids was studied by in vitro incorporation of [3H]galactose into neonatal rat sciatic nerves before and after endoneurial explant culture and in culture of purified Schwann cells. In neonatal nerves prior to culture, [3H]galactose was actively incorporated into galactocerebrosides (...
journal_title：Neurochemical research
pub_type： 杂志文章
doi：10.1007/BF00968672
更新日期：1990-03-01 00:00:00
abstract：:(E)-2-(1-hydroxyl-4-oxocyclohexyl) ethyl caffeine (HOEC), a naturally caffeic ester isolated from Incarvillea mairei, has been reported to possess anti-inflammatory activity by targeting 5-lipoxygenase. However, its other potential activities have yet to be explored. In this study, we measured antioxidant activity of ...
journal_title：Neurochemical research
pub_type： 杂志文章
doi：10.1007/s11064-014-1498-5
更新日期：2015-03-01 00:00:00
abstract：:Cell surface β-Amyloid precursor protein (APP) is known to have a functional role in iron homeostasis through stabilising the iron export protein ferroportin (FPN). Mechanistic evidence of this role has previously only been provided through transcriptional or translational depletion of total APP levels. However, numer...
journal_title：Neurochemical research
pub_type： 杂志文章
doi：10.1007/s11064-019-02747-y
更新日期：2019-06-01 00:00:00
abstract：:The stability of somatostatin (SS) in brain tissue was studied in human material obtained post-mortem and in the rat. In both human and rat brain, loss of SS was found to occur in tissue frozen to -70 degrees C. In the rat, this loss varied from 26 to 70 percent depending on the type of tissue processing used. These d...
journal_title：Neurochemical research
pub_type： 杂志文章
doi：10.1007/BF00973289
更新日期：1988-06-01 00:00:00
abstract：:The first mentioning of the word "receptor" for the structure with which a bioactive compound should react for obtaining its specific influence on a physiological system goes back to the years around 1900. The receptor concept was adapted from the lock and key theory for the enzyme substrate and blockers interactions....
journal_title：Neurochemical research
pub_type： 杂志文章,评审
doi：10.1007/s11064-014-1398-8
更新日期：2014-10-01 00:00:00
abstract：:Comparative structure-function studies have been carried out for alpha-conotoxin GI acting on nicotinic acetylcholine receptors (AChR) from mammalian muscles and from the electric organ of the Torpedo californica ray and for alpha-conotoxin ImI, which targets the neuronal alpha7 AChR. A series of analogs has been prep...
journal_title：Neurochemical research
pub_type： 杂志文章
doi：10.1023/a:1022889827195
更新日期：2003-04-01 00:00:00
abstract：:The effects of vinpocetine on internal Na+ (Na(i)), cAMP accumulation, internal Ca2+ (Ca(i)) and excitatory amino acid neurotransmitters release, under resting and under depolarized conditions, was investigated in rat striatum synaptosomes. Veratridine (20 microM) or high K+ (30 mM) were used as depolarizing agents. R...
journal_title：Neurochemical research
pub_type： 杂志文章
doi：10.1023/a:1021164418478
更新日期：1999-12-01 00:00:00
abstract：:Malformations of cortical development (MCD) are critical brain development disorders associated with varied abnormalities in both anatomic structures and neural functioning. It is also a very common etiology to the epilepsy, in which the alteration on excitability of cortical neurons is hypothesized as one of importan...
journal_title：Neurochemical research
pub_type： 杂志文章
doi：10.1007/s11064-016-1936-7
更新日期：2016-09-01 00:00:00
abstract：:The spontaneously hypertensive rat (SHR) has been proposed as an animal model for attention-deficit hyperactivity disorder (ADHD). The behavioural problems have been suggested to be secondary to altered reinforcement mechanisms in which nucleus accumbens dopaminergic activity plays an important role. Interaction betwe...
journal_title：Neurochemical research
pub_type： 杂志文章
doi：10.1007/BF00973098
更新日期：1995-04-01 00:00:00
abstract：:The effect of phenobarbital (100 mg/kg i.p.) and 6-aminonicotinamide (6AN) (35 mg/kg i.p.) on enzyme activities related to energy transduction was investigated on the homogenate "in toto", non-synaptic mitochondrial fraction and synaptosomal fraction isolated from different rat brain areas (cerebral cortex, hippocampu...
journal_title：Neurochemical research
pub_type： 杂志文章
doi：10.1007/BF00971361
更新日期：1987-01-01 00:00:00
abstract：:Excitotoxicity has been associated with the loss of medium spiny neurons (MSN) in Huntington's disease (HD). We have previously observed that the content of the glial glutamate transporters, glutamate transporter 1 (GLT-1) and glutamate-aspartate transporter (GLAST), diminishes in R6/2 mice at 14 weeks of age but not ...
journal_title：Neurochemical research
pub_type： 杂志文章
doi：10.1007/s11064-010-0168-5
更新日期：2010-08-01 00:00:00
abstract：:The activity of gamma-glutamyltransferase localized in isolated brain synaptic membranes- and microvessels-enriched fractions was assayed after treatment of rats with either phenobarbital or ethanol. Phenobarbital increased the activity of gamma-glutamyltransferase in microvessels, without alteration of synaptic membr...
journal_title：Neurochemical research
pub_type： 杂志文章
doi：10.1007/BF00993245
更新日期：1987-04-01 00:00:00
abstract：:Neuronal perikarya were isolated, using bulk preparative procedures, from bovine brains. Synaptosomes, neuronal perikarya, and brain homogenates had similar ganglioside patterns, with the synaptosomes containing at least four times more total ganglioside per mg protein than the neuronal perikarya and twice that of the...
journal_title：Neurochemical research
pub_type： 杂志文章
doi：10.1007/BF00966108
更新日期：1976-04-01 00:00:00
abstract：:Overactivation of glutamate receptors results in neurodegeneration in a variety of brain pathologies, including ischemia, epilepsy, traumatic brain injury and slow-progressing neurodegenerative disorders. In all these pathologies, it is well accepted that the calcium-dependent cysteine proteases calpains are key playe...
journal_title：Neurochemical research
pub_type： 杂志文章
doi：10.1007/s11064-010-0323-z
更新日期：2010-12-01 00:00:00
abstract：:Synaptosomal membrane proteins solubilized with 8% CHAPS-8 M urea were analyzed with two-dimensional electrophoresis (2DE). The membrane proteins were resolved up to 250 spots on a 2DE map, ranging in isoelectric points (pI) from 3.5 to 10.0 and molecular weights (MW) from 10 kDa to 200 kDa. Comparison of the mapped p...
journal_title：Neurochemical research
pub_type： 杂志文章
doi：10.1007/BF00966203
更新日期：1990-05-01 00:00:00
abstract：:A set of synaptic membrane antigens has been investigated in a number of tissues by indirect immunofluorescence histochemistry, using an antiserum (SPM-I) raised against a purified synaptosomal plasma membrane fraction prepared from day-old chick forebrain. The antigens were found to be present in both the central and...
journal_title：Neurochemical research
pub_type： 杂志文章
doi：10.1007/BF00966022
更新日期：1977-02-01 00:00:00
abstract：:MicroRNAs (miRNAs), an abundant class of small noncoding RNA molecules, which regulate gene expression by functioning as post-transcriptional regulatory factors, have been identified as key components of traumatic brain injury (TBI) progression. MicroRNA-21 (miR-21) is a recently identified typical miRNA that is invol...
journal_title：Neurochemical research
pub_type： 杂志文章,评审
doi：10.1007/s11064-018-2602-z
更新日期：2018-10-01 00:00:00
abstract：:The effect of castration on the levels of brain monoamines and their metabolites has been investigated in rats which became or did not become muricidal following long-term isolation. Fourteen brain areas were explored: olfactory bulbs (OB), olfactory tubercles (OT), septum (Se), striatum (Sr), amygdala (A), thalamus (...
journal_title：Neurochemical research
pub_type： 杂志文章
doi：10.1007/BF00967251
更新日期：1993-04-01 00:00:00
abstract：:Recent evidence reveals that prolactin gene expression (PRL-GE) in mammotropes occurs in pulses, but the molecular process(es) underlying this phenomenon remains unclear. Earlier, we have identified an E-box (E-box133) in the rat PRL promoter that binds several circadian elements and is critical for this dynamic proce...
journal_title：Neurochemical research
pub_type： 杂志文章
doi：10.1007/s11064-016-1843-y
更新日期：2016-06-01 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
