Abstract:
:Stimulation of prostaglandin (PG) release in rat astroglial cultures by various substances, including phorbol esters, melittin, or extracellular ATP, has been reported recently. It is shown here that glucocorticoids (GCs) reduced both basal and stimulated PGD2 release. Hydrocortisone, however, did not inhibit ATP-, calcium ionophore A23187-, or tetradecanoyl phorbol acetate (TPA)-stimulated arachidonic acid release, and only TPA stimulations were affected by dexamethasone. GC-mediated inhibition of PGD2 release thus appeared to exclude regulation at the phospholipase A2 (PLA2) level. Therefore, the effects of GCs on the synthesis of lipocortin I (LC I), a potent, physiological inhibitor of PLA2, were studied in more detail. Dexamethasone was not able to enhance de novo synthesis of LC I in freshly seeded cultures and failed to increase LC I synthesis in 2-3-week-old cultures. It is surprising that LC I was the major LC synthesized in those cultures, and marked amounts accumulated with culture time, reaching plateau levels at approximately day 10. In contrast, LC I was barely detectable in vivo. This tonic inhibition of PLA2 is the most likely explanation for unsuccessful attempts to evoke PG release in astrocyte cultures by various physiological stimuli. GC receptor antagonists (progesterone and RU 38486) given throughout culture time reduced LC I accumulation and simultaneously increased PGD2 release. Nonetheless, a substantial production of LC I persisted in the presence of antagonists. Therefore, LC I induction did not seem to involve GC receptor activation. This was confirmed in serum- and GC-free brain cell aggregate cultures. Here also a marked accumulation of LC I was observed.(ABSTRACT TRUNCATED AT 250 WORDS)
journal_name
J Neurochemjournal_title
Journal of neurochemistryauthors
Gebicke-Haerter PJ,Schobert A,Dieter P,Honegger P,Hertting Gdoi
10.1111/j.1471-4159.1991.tb02113.xsubject
Has Abstractpub_date
1991-07-01 00:00:00pages
175-83issue
1eissn
0022-3042issn
1471-4159journal_volume
57pub_type
杂志文章abstract::Functional regeneration in a complete T8 transection model Cheng et al. (1996) and most recently, acidic fibroblast growth factor (aFGF; also known as FGF-1) involved in the repair process of the spinal cord injury (SCI) rat Tsai et al. (2008) have been reported. To further reveal the mechanism of the repair process o...
journal_title:Journal of neurochemistry
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abstract::Glutathione-S-transferase activity in the brain of male mammals (rat and mouse) was found to be relatively lower than in that of females. In contrast, the male aves (pigeon, kite, vulture, and crow) exhibited comparatively higher activity in brain glutathione-S-transferase than the corresponding females. Postnatal dev...
journal_title:Journal of neurochemistry
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abstract::The origin of afferent somatostatin-containing fibers terminating in medial and ventral parts of the striatum has been investigated by performing various neurochemical and surgical lesions in the rat. Lesions of the anterior hypothalamus, amygdala, and the hippocampal commissure as well as lesions with 6-hydroxydopami...
journal_title:Journal of neurochemistry
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doi:10.1111/j.1471-4159.1987.tb05748.x
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abstract::Administration of L-DOPA (50 mg/kg) elicits a significant increase in extracellular dopamine in striata of rats treated with the catecholaminergic neurotoxin 6-hydroxydopamine but not in striata of intact rats. To assess the role of dopaminergic nerve terminals in determining the effects of exogenous L-DOPA on extrace...
journal_title:Journal of neurochemistry
pub_type: 杂志文章
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abstract::The uptake of radioactive biotin has been studied in glial cell cultures from dissociated cerebral hemispheres of newborn rats. We describe saturable kinetics for the biotin uptake at biotin concentrations of less than 60 nM and linear at greater than 60 nM. The uptake appeared temperature sensitive, Na+ independent, ...
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journal_title:Journal of neurochemistry
pub_type: 杂志文章
doi:10.1111/j.1471-4159.1991.tb08291.x
更新日期:1991-10-01 00:00:00
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journal_title:Journal of neurochemistry
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journal_title:Journal of neurochemistry
pub_type: 杂志文章
doi:10.1111/j.1471-4159.1988.tb02946.x
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pub_type: 杂志文章
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更新日期:1985-09-01 00:00:00
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journal_title:Journal of neurochemistry
pub_type: 杂志文章
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更新日期:2020-09-11 00:00:00
abstract::We have screened a human cDNA library using an expressed sequence tag related to the BM-40/secreted protein, acidic and rich in cysteine (SPARC)/osteonectin family of proteins and isolated a novel cDNA. It encodes a protein precursor of 424 amino acids that consists of a signal peptide, a follistatin-like domain, a Ca...
journal_title:Journal of neurochemistry
pub_type: 杂志文章
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更新日期:1999-07-01 00:00:00
abstract::The presynaptic terminals of skate (Raja montagui) electric organ were tested for their sensitivity to calcium channel antagonists. Acetylcholine (ACh) release and the elevation of intraterminal Ca2+ concentrations triggered by K+ depolarisation were studied. ACh release was measured as 3H efflux from slices of organ ...
journal_title:Journal of neurochemistry
pub_type: 杂志文章
doi:10.1046/j.1471-4159.1995.64020944.x
更新日期:1995-02-01 00:00:00
abstract::In Guadeloupe, epidemiological data have linked atypical parkinsonism with fruit and herbal teas from plants of the Annonaceae family, particularly Annona muricata. These plants contain a class of powerful, lipophilic complex I inhibitors, the annonaceous acetogenins. To determine the neurotoxic potential of these sub...
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更新日期:2004-01-01 00:00:00
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journal_title:Journal of neurochemistry
pub_type: 杂志文章
doi:10.1046/j.1471-4159.1996.66062621.x
更新日期:1996-06-01 00:00:00
abstract::The distribution of cerebellar gangliosides was studied in staggerer (sg/sg) mutant mice, where the majority of granule cells die after completing their migration across the molecular layer. In addition, the external granule cell layer in sg/sg mice persists longer than in normal mice. Moreover, in the sg/sg cerebellu...
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pub_type: 杂志文章
doi:10.1111/j.1471-4159.1984.tb12856.x
更新日期:1984-10-01 00:00:00
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journal_title:Journal of neurochemistry
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doi:10.1111/j.1471-4159.1989.tb07249.x
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abstract::Prolonged stress affects homeostasis in various organs and induces stress-associated disorders. We examined the cellular changes of pituitary gland under the continuous stress condition using a rat model in which rats were kept in a cage filled with water to a height of 1.5 cm for up to 5 days. Among the pituitary hor...
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pub_type: 杂志文章
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journal_title:Journal of neurochemistry
pub_type: 杂志文章
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abstract::The turnover of acetylcholine (ACh) in rat brain synaptosomes and its compartmentation in the labile bound and stable bound pools were investigated. The P(2) fraction from rat brain was subjected to three sequential incubations, each terminated by centrifugation followed by determination of ACh concentrations by gas c...
journal_title:Journal of neurochemistry
pub_type: 杂志文章
doi:10.1111/j.1471-4159.1981.tb00423.x
更新日期:1981-05-01 00:00:00
abstract::Myelination of peripheral nerves by Schwann cells depends upon a gene regulatory network controlled by early growth response Egr2/Krox20, which is specifically required for Schwann cells to initiate and maintain myelination. To elucidate the mechanism by which Egr2 regulates gene expression during myelination, we have...
journal_title:Journal of neurochemistry
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journal_title:Journal of neurochemistry
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更新日期:2000-06-01 00:00:00
abstract::The experiments described in this paper were designed to test whether increasing choline availability over normal physiological levels increases acetylcholine synthesis in the cat's superior cervical ganglion. When ganglia were perfused with Krebs solution, an increase in the medium's choline concentration over physio...
journal_title:Journal of neurochemistry
pub_type: 杂志文章
doi:10.1111/j.1471-4159.1981.tb01610.x
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abstract::Developmental profiles were determined for the activities of eight enzymes involved in fatty acid beta-oxidation in rat brain. The enzymes studied were the palmitoyl-CoA, octanoyl-CoA, butyryl-CoA, glutaryl-CoA, and 3-hydroxyacyl-CoA dehydrogenases, the enoyl-CoA hydratase (crotonase), and the C4- and C10-thiolases. W...
journal_title:Journal of neurochemistry
pub_type: 杂志文章
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abstract::We examined the effects of chronic ethanol exposure on the levels of N-methyl-D-aspartate receptor subunit 1 (NMDAR1) protein, an essential component of N-methyl-D-aspartate glutamate receptors, in rat brain. By immunoblotting procedures using a specific antibody for the NMDAR1 subunit, we found that ethanol dramatica...
journal_title:Journal of neurochemistry
pub_type: 杂志文章
doi:10.1046/j.1471-4159.1994.62041635.x
更新日期:1994-04-01 00:00:00
abstract::The major component of the amyloid deposition that characterizes Alzheimer's disease is the 4-kDa beta A4 protein, which is derived from a much larger amyloid protein precursor (APP). A procedure for the complete purification of APP from human brain is described. The same amino terminal sequence of APP was found in tw...
journal_title:Journal of neurochemistry
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doi:10.1111/j.1471-4159.1992.tb08465.x
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abstract::The conversion of protease-sensitive prion protein (PrP-sen) to a high beta-sheet, protease-resistant and often fibrillar form (PrP-res) is a central event in transmissible spongiform encephalopathies (TSE) or prion diseases. This conversion can be induced by PrP-res itself in cell-free conversion reactions. The deter...
journal_title:Journal of neurochemistry
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更新日期:2001-11-01 00:00:00