Abstract：
:Incubation of beta-endorphin with cytosolic and particulate fractions of rat brain resulted in the formation of several peptides, including gamma-endorphin [beta-endorphin-(1-17)] and beta-endorphin-(18-31), indicating the presence of enzyme activity cleaving the Leu17-Phe18 bond of beta-endorphin. An assay for this Leu-Phe cleaving activity, based on the cleavage of the 14C-labeled substrate acetyl-Val-Thr-Leu-Phe-[epsilon-([14C]CH3)2]Lys-NHCH3, was used to examine the properties of this enzyme activity. beta-Endorphin-(1-31) competitively inhibited the Leu-Phe-cleaving enzyme activity on the pentapeptide substrate. Over 90% of activity was recovered in the cytosolic fraction. Leu-Phe-cleaving activity behaved like a thiol endopeptidase because it was inhibited by low concentrations of N-ethylmaleimide, p-chloromercuribenzoate, p-chloromercuribenzoyl sulfate, and low concentrations of Hg2+. Low concentrations of sulfhydryl compounds stimulated Leu-Phe-cleaving activity. The activity was optimal between pH 8.5 and 9.0. The Km of Leu-Phe-cleaving activity in the cytosolic fraction was 35 microM and in the particulate fraction 88 microM with Vmax values of 193 and 15 nmol mg protein-1 h-1, respectively. The apparent molecular mass of the Leu-Phe-cleaving enzyme was estimated by gel filtration to be approximately 200 kilodaltons. These properties of Leu-Phe-cleaving activity indicate that the Leu-Phe-cleaving enzyme is distinct from any known brain endopeptidase.
journal_name
J Neurochemjournal_title
Journal of neurochemistryauthors
Lebouille JL,Hendriks RW,Soeter NM,Burbach JPdoi
10.1111/j.1471-4159.1989.tb07249.xsubject
Has Abstractpub_date
1989-06-01 00:00:00pages
1714-21issue
6eissn
0022-3042issn
1471-4159journal_volume
52pub_type
杂志文章abstract：:Lysophospholipids are generated during the turnover and breakdown of membrane phospholipids. We have identified and partially characterized three enzymes involved in the metabolism of lysophospholipids in human brain, namely, lysophospholipase, lysophospholipid:acyl-CoA acyltransferase (acyltransferase), and lysophosp...
journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1046/j.1471-4159.1994.63051839.x
更新日期：1994-11-01 00:00:00
abstract：:Primary cultures of astrocytes from newborn rat brain showed evidence of a substrate-saturable process for glucose transport. The system shows a relatively high affinity for the substrate, with an apparent Km of approximately 1 mM. Maintenance of the cells in medium containing thyroid-hormone-free serum for 3, 6, or 9...
journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1111/j.1471-4159.1985.tb07239.x
更新日期：1985-11-01 00:00:00
abstract：:Hypoxic preconditioning (HP) 24 h before hypoxic-ischemic (HI) injury confers significant neuroprotection in neonatal rat brain. Recent studies have shown that the mitogen-activated protein kinase (MAPK) and phosphatidylinositol-3-kinase (PI3K) intracellular signaling pathways play a role in the induction of tolerance...
journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1111/j.1471-4159.2004.02324.x
更新日期：2004-04-01 00:00:00
abstract：:Compound AF64A, ethylcholine mustard aziridinium ion (0.4-8 nmol) was stereotaxically administered into rat dorsal hippocampus, and neurochemical changes were determined 5 days later. AF64A treatment, over an almost 10-fold dose range, resulted in a significant (up to 70%) decline in choline acetyltransferase activity...
journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1111/j.1471-4159.1983.tb11836.x
更新日期：1983-07-01 00:00:00
abstract：:Neuroleptics, which are potent dopamine receptor antagonists, are used to treat psychosis. In the striatum, dopamine subtype-2 (D2) receptors interact with high-affinity adenosine subtype-2 (A2a) receptors. To examine the effect of various neuroleptics on the major subtypes of striatal dopamine and adenosine receptors...
journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1046/j.1471-4159.1995.65052057.x
更新日期：1995-11-01 00:00:00
abstract：:Local cerebral glucose utilization (LCGU) was measured, using the quantitative autoradiographic [14C]2-deoxy-D-glucose method, in 56 brain regions of 3-month-old, awake Fischer-344 rats, after intraperitoneal administration of sulpiride (SULP) 100 mg/kg. SULP, an "atypical" neuroleptic, is a selective antagonist of D2...
journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1111/j.1471-4159.1987.tb02910.x
更新日期：1987-08-01 00:00:00
abstract：:Environmental stress can interact with genetic predisposition to increase the risk of developing psychopathology. In this work, we tested the hypothesis that social isolation stress interacts with impaired glutathione synthesis and have cumulative effects on the neurochemical profile of the frontal cortex. A mouse mod...
journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1111/jnc.14116
更新日期：2017-09-01 00:00:00
abstract：:The effect of glucocorticoids on polyamine metabolism has been elucidated further by measuring putrescine, spermidine, and spermine levels as well as ornithine decarboxylase, S-adenosylmethionine decarboxylase, and N1-acetylspermidine transferase activities in the hippocampus, cerebellar cortex, vermis, and deep nucle...
journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1111/j.1471-4159.1988.tb01797.x
更新日期：1988-09-01 00:00:00
abstract：:Extraction of rat brain membrane-associated protein kinase C with high specific activity was obtained by applying benzyl alcohol (a membrane fluidizer), EDTA, and high hydrostatic pressures. Approximately 50% of total brain-associated activity was extracted from membranes. The pressure-extracted activity had an eightf...
journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1111/j.1471-4159.1989.tb07284.x
更新日期：1989-06-01 00:00:00
abstract：:Spinocerebellar ataxia 1 (SCA1) is a dominantly inherited neurodegenerative disease associated with progressive ataxia resulting from the loss of cerebellar Purkinje cells (PCs) and neurons in the brainstem. In PCs of SCA1 transgenic mice, the disease causing ataxin-1 protein mediates the formation of S100B containing...
journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1111/j.1471-4159.2010.06791.x
更新日期：2010-08-01 00:00:00
abstract：:To differentiate the effect of muscle contractile activity from that of motor nerve on oxidative processes in type I muscle, oxidative processes were studied in muscle after immobilization and after denervation. The two processes led to similar atrophy of muscle weight and of the mean diameter of muscle fibers. Disuse...
journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1111/j.1471-4159.1980.tb09009.x
更新日期：1980-12-01 00:00:00
abstract：:Members of the protein kinase D (PKD) family of serine/threonine kinases are known to exert diverse roles in neuronal stress responses. Here, we show the transient activation and nuclear translocation of endogenous PKD upon oxidative stress induced by H2 O2 treatment in primary neuronal cultures. Using pharmacological...
journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1111/jnc.14131
更新日期：2017-09-01 00:00:00
abstract：:Reactive oxygen and nitrogen species have emerged as predominant effectors of neurodegeneration. We demonstrated that expression of the fully active G93A Cu,Zn superoxide dismutase mutant in neuroblastoma cells is associated with an increased level of oxidatively modified proteins, in terms of carbonylated residues. A...
journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1046/j.1471-4159.2003.01783.x
更新日期：2003-06-01 00:00:00
abstract：:The mu-opioid receptor agonists have a preferential effect on nociception in adults but their analgesic effect is less selective in neonates. Here we presented our finding that the mu-opioid receptor agonists had no effect on high voltage-activated Ca(2+) channels (HVACCs) in adult dorsal root ganglion (DRG) neurons t...
journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1111/j.1471-4159.2009.06014.x
更新日期：2009-05-01 00:00:00
abstract：:Our previous studies have implicated perlecan, a specific heparan sulfate proteoglycan, in the pathogenesis of fibrillar beta-amyloid protein (A beta) accumulation and persistence in Alzheimer's disease (AD) brain. In the present investigation, we determined if perlecan mRNA was present in rodent and human brain tissu...
journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1046/j.1471-4159.1996.67031132.x
更新日期：1996-09-01 00:00:00
abstract：:The effects of hypoxia and hypoglycaemia on the redox state in vitro have been studied. NADH and NAD+ were extracted simultaneously from superfused cerebral cortex slices and assayed by bioluminescence. The results show a nonsignificant increase in NADH and the redox ratio in "mild hypoxia," whereas "severe hypoxia" p...
journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1111/j.1471-4159.1988.tb04851.x
更新日期：1988-07-01 00:00:00
abstract：:Prostaglandin E1 (PGE1)-mediated transmembrane signal control systems were investigated in intact murine neuroblastoma cells (clone N1E-115). PGE1 increased intracellular levels of total inositol phosphates (IP), cyclic GMP, cyclic AMP, and calcium ([Ca2+]i). PGE1 transiently increased inositol 1,4,5-trisphosphate for...
journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1111/j.1471-4159.1991.tb06416.x
更新日期：1991-12-01 00:00:00
abstract：:Neuroprotection is one of the prominent functions of the interleukin (IL)-6-type cytokine family, for which the underlying mechanism(s) are not fully understood. We have previously shown that neuroprotection and neuromodulation mediated by IL-6 require neuronal adenosine A(1) receptor (A(1) R) function. We now have in...
journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1111/j.1471-4159.2010.06881.x
更新日期：2010-09-01 00:00:00
abstract：:Previously we found close similarities between high-affinity binding sites for [3H]cocaine and those for [3H]imipramine in the mouse cerebral cortex in regard to their association with neuronal uptake of serotonin. In the present study we investigated whether the two ligands bind to the same site. The two ligands had ...
journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1111/j.1471-4159.1984.tb06703.x
更新日期：1984-07-01 00:00:00
abstract：:Substance P and neurokinin A both potentiated N-methyl-D-aspartate (NMDA)-induced currents recorded in acutely isolated neurons from the dorsal horn of the rat. To elucidate the mechanism underlying this phenomenon, we measured the effects of tachykinins and glutamate receptor agonists on [Ca2+]i in these cells. Subst...
journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1111/j.1471-4159.1993.tb03242.x
更新日期：1993-03-01 00:00:00
abstract：:Pituitary adenylate cyclase-activating polypeptide (PACAP) gene expression was analyzed in PC12 cells. PC12 cells transfected with a PACAP promoter-luciferase reporter construct were utilized to investigate the effects of PACAP, either alone or in combination with nerve growth factor (NGF), on PACAP transcriptional re...
journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1046/j.1471-4159.2000.740501.x
更新日期：2000-02-01 00:00:00
abstract：:It is generally accepted that in mammalian brain histamine is metabolized solely by histamine methyltransferase (HMT), to form tele-methylhistamine, then oxidized to tele-methylimidazoleacetic acid. However, histamine's oxidative metabolite in the periphery, imidazoleacetic acid (IAA), is also present in brain and CSF...
journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1046/j.1471-4159.1995.65020818.x
更新日期：1995-08-01 00:00:00
abstract：:Brain edema in hepatic encephalopathy has been associated with circulating ammonia that is metabolized to glutamine. We measured alterations in blood chemistry and brain regional specific gravity and ion and amino acid contents in models of simple hyperammonemia and liver failure induced by daily administrations of am...
journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1046/j.1471-4159.1994.62010197.x
更新日期：1994-01-01 00:00:00
abstract：:Environment-induced relapse is a major concern in drug addiction because of the strong associations formed between drug reward and environment. Cocaine-conditioned place preference is an ideal experimental tool to examine adaptations in the molecular pathways that are activated upon re-exposure to an environment previ...
journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1111/j.1471-4159.2008.05518.x
更新日期：2008-08-01 00:00:00
abstract：:Transient and time-dependent modulations of neural cell adhesion molecule (NCAM) polysialylation in the dentate gyrus of the rodent hippocampus are a feature of spatial and nonspatial forms of learning. In the hippocampal formation, polysialic acid immunoreactivity was localized to granule-like cells and their mossy f...
journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1046/j.1471-4159.1997.68062538.x
更新日期：1997-06-01 00:00:00
abstract：:The protein kinase v-akt murine thymoma viral oncogene homolog (AKT) gene family comprises three human homologs that phosphorylate and inactivate glycogen synthase kinase 3beta (GSK3beta). Studies have reported the genetic association of AKT1 with schizophrenia. Additionally, decreased AKT1 protein expression and the ...
journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1111/j.1471-4159.2006.04033.x
更新日期：2006-10-01 00:00:00
abstract：:Psychostimulants are widely abused drugs that may cause addiction in vulnerable individuals. While the reward circuitry of the brain is involved in addiction establishment, various pathways in the brain may provide protection at the molecular level that limits the acute and chronic effects of drugs. These targets may ...
journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1111/jnc.14959
更新日期：2020-08-01 00:00:00
abstract：:Microelectrophoretic methods were used to study the effects on cat spinal neurones of a number of compounds structurally related to the gamma-aminobutyric acid (GABA) agonists muscimol, THIP, and isoguvacine. While N-methylmuscimol was an agonist at bicuculline methochloride-sensitive GABA receptors, somewhat weaker t...
journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1111/j.1471-4159.1982.tb12573.x
更新日期：1982-11-01 00:00:00
abstract：:In Aplysia, serotonin mediates behavioral sensitization by increasing the strength of the synapse between sensory and motor neurons, a process known as facilitation. The retention of long-term facilitation is blocked by rapamycin, an inhibitor of a specific translational pathway. One possible rapamycin-sensitive targe...
journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1111/j.1471-4159.2004.02634.x
更新日期：2004-09-01 00:00:00
abstract：:Proteoglycans (PGs) are major constituents of the extracellular matrix and have recently been proposed to contribute to synaptic plasticity. Hippocampal PGs have not yet been studied or linked to memory. The aim of the study, therefore, was to isolate and characterize rat hippocampal PGs and determine their possible r...
journal_title：Journal of neurochemistry
pub_type： 杂志文章
doi：10.1111/jnc.12783
更新日期：2014-09-01 00:00:00
