Abstract:
:The mechanism of the Ca2+-dependent stimulation of neurotransmitter release by 4-aminopyridine in synaptosomes was studied. The stimulation of gamma-[3H]aminobutyric acid and [3H]acetylcholine release by 4-aminopyridine was not significantly affected either by tetrodotoxin or by the absence of Na+ in the medium, whereas the toxin notably inhibited the release of both transmitters induced by veratridine. On the other hand, the release of labeled gamma-aminobutyric acid induced by 4-aminopyridine was inhibited by both La3+ and ruthenium red, two blockers of Ca2+ transport in synaptosomes. In other experiments, 4-aminopyridine had only a slight stimulatory effect, if any, on the influx of 45Ca2+ into synaptosomes, under both resting and K+-depolarizing conditions. Ruthenium red inhibited the stimulation by K+ of the 45Ca2+ uptake, and 4-aminopyridine did not antagonize this inhibition. We conclude that the transmitter-releasing action of 4-aminopyridine in synaptosomes does not involve an excitatory effect on the membrane which may result in the opening of voltage-sensitive Na+ channels. 4-Aminopyridine does not seem to act either by enhancing Ca2+ entry into the synaptosomes. It is proposed that 4-aminopyridine facilitates the coupling between Ca2+ binding and transmitter secretion at the presynaptic membrane.
journal_name
Brain Resjournal_title
Brain researchauthors
Tapia R,Sitges M,Morales Edoi
10.1016/0006-8993(85)91307-1subject
Has Abstractpub_date
1985-12-30 00:00:00pages
373-82issue
1-2eissn
0006-8993issn
1872-6240pii
0006-8993(85)91307-1journal_volume
361pub_type
杂志文章相关文献
BRAIN RESEARCH文献大全abstract::Spinal muscular atrophy is caused by deletions or mutations in the SMN1 gene that result in reduced expression of the SMN protein. The SMN protein is an essential molecular chaperone that is required for the biogenesis of multiple ribonucleoprotein (RNP) complexes including spliceosomal small nuclear RNPs (snRNPs). Re...
journal_title:Brain research
pub_type: 杂志文章,评审
doi:10.1016/j.brainres.2018.02.022
更新日期:2018-08-15 00:00:00
abstract::The function of the phosphoinositide signal transduction system and the levels of heterotrimeric G-protein alpha-subunits were examined in postmortem prefrontal cortex regions (8/9) and region (10) from suicide victims with major depression and matched control subjects without psychiatric illness. The hydrolysis of [3...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(96)00207-7
更新日期:1996-06-03 00:00:00
abstract::Experiments were done in cats to identify neurons in the paramedian reticular nucleus (PRN) sending collateral axons to the region of the intermediolateral nucleus (IML) at different levels of the thoracic cord by using lectin-conjugated horseradish peroxidase (HRP) and double-labeling fluorochrome histochemistry to r...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(87)90377-5
更新日期:1987-04-07 00:00:00
abstract::Spontaneous and hypothalamically induced hippocampal rhythmical slow activity (RSA or theta) was studied acutely in rats anaesthetized with urethane or immobilized with D-tubocurarine. Systematic tracking of microelectrodes showed two foci of hippocampal RSA, one located in the basal part (stratum oriens) of CAl (mean...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(76)90711-3
更新日期:1976-12-17 00:00:00
abstract::Intraventricular administration of cholecystokinin-octapeptide in unanesthetized rats results in a significant reduction in the number of [3H]spiperone binding sites. Striatal levels of the dopamine metabolites 3,4-dihydroxyphenylacetic acid and homovanillic acid were significantly reduced, whereas there was no signif...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(83)90949-6
更新日期:1983-10-31 00:00:00
abstract::Amyotrophic lateral sclerosis (ALS) is characterized by a progressive degeneration of upper and lower motor neurons, resulting in fatal paralysis due to denervation of the muscle. Due to genetic, pathological and symptomatic overlap, ALS is now considered a spectrum disease together with frontotemporal dementia (FTD),...
journal_title:Brain research
pub_type: 杂志文章,评审
doi:10.1016/j.brainres.2018.02.011
更新日期:2018-08-15 00:00:00
abstract::In several rodent species social play appears to be necessary for proper deployment of species-specific patterns of aggressive and reproductive behavior. Specifically, in male Syrian hamsters (Mesocricetus auratus), play has been linked to the development of adult aggression. We quantified several types of social play...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/j.brainres.2019.02.012
更新日期:2019-06-01 00:00:00
abstract::The syndrome of benign familial neonatal convulsions (BFNC) is characterized by seizures starting within the first days of life and disappearing within weeks to months. BFNC is caused by loss-of-function mutations in the potassium channels KCNQ2 and KCNQ3 which can well explain the resulting neuronal hyperexcitability...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/j.brainres.2006.01.023
更新日期:2006-03-10 00:00:00
abstract::It has been reported that L-glutamate (L-glu) microinjection into the hypothalamic paraventricular nucleus (PVN) evokes pressor and tachycardiac responses in unanesthetized rats. In the present study the hypothesis was tested that a local nitric oxide (NO)-guanylate cyclase interaction mediates cardiovascular effects ...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/j.brainres.2010.05.023
更新日期:2010-07-16 00:00:00
abstract::Mammalian vestibular type I hair cells (VIHCs) are innervated by an afferent synaptic calyx which contains vesicles and is immunoreactive for GABA. We describe here the effects of GABA on electrophysiological properties and on cytosolic free-calcium levels ([Ca2+]i) of VIHCs isolated from guinea-pig ampullae. Whole-ce...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(93)90882-n
更新日期:1993-04-23 00:00:00
abstract::To study morphological changes in the cortex that follow repeated ischemia, one, two, and three 7-min unilateral occlusions of the carotid artery at 6-h intervals, and three, four, and five 7-min similar occlusions at 12-h intervals were produced in gerbils. Animals with one and two 7-min occlusions at 6-h intervals s...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(95)00449-z
更新日期:1995-07-17 00:00:00
abstract::Male Long-Evans rats were administered nicotine bitartrate or sodium tartrate either during adolescence (p29-43) or adulthood (p80-94). Route of administration was via subcutaneously implanted osmotic pump (initial dose 2.0 mg/kg/day, free base). Five weeks following nicotine administration, brains were processed for ...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/j.brainres.2007.03.019
更新日期:2007-06-02 00:00:00
abstract::We have examined the question of whether alpha-tubulin is detyrosylated during axonal transport in retinal ganglion cell axons and axons of spinal motor neurons. The degree of tyrosylation of alpha-tubulin was estimated from immunocytochemistry and immunoblotting with two anti-alpha-tubulin monoclonals, one of which (...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(86)90697-9
更新日期:1986-08-27 00:00:00
abstract::Cerebrovascular carbon dioxide (CO2) reactivity is an important hemodynamic index in cerebrovascular disease. In the present study T2*-weighted magnetic resonance image (T2* WI) was evaluated as a non-invasive method to investigate changes in CO2 reactivity. Fourteen rats were subjected to permanent or, 30 and 90 min ...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/S0006-8993(96)01079-7
更新日期:1997-01-09 00:00:00
abstract::At present severe damage to hair cells and sensory neurons in the inner ear results in non-treatable auditory disorders. Cell implantation is a potential treatment for various neurological disorders and has already been used in clinical practice. In the inner ear, delivery of therapeutic substances including neurotrop...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/j.brainres.2010.12.078
更新日期:2011-03-04 00:00:00
abstract::Manual gestures occur on a continuum from co-speech gesticulations to conventionalized emblems to language signs. Our goal in the present study was to understand the neural bases of the processing of gestures along such a continuum. We studied four types of gestures, varying along linguistic and semantic dimensions: l...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/j.brainres.2009.04.034
更新日期:2009-06-18 00:00:00
abstract::There was a distinct sex-related difference in the anterior pituitary level of substance P-like immunoreactivity (SP-LI) in adult rats; the anterior pituitaries of male rats contained a higher concentration of SP-LI than those of females. Neonatal castration (day 1) resulted in a marked decrease of the SP-LI level in ...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(83)90863-6
更新日期:1983-08-29 00:00:00
abstract::The regulation of circadian rhythms changes with age. In humans, changes in the timing of sleep and wakefulness are especially common. In Syrian hamsters Mesocricetus auratus the free running period of the activity/rest rhythm shortens with age. The present study tested the hypothesis that critical age-related changes...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(95)00423-n
更新日期:1995-07-17 00:00:00
abstract::We tested the hypothesis that intravenous infusion of human marrow stromal cells (hMSC) with a nitric oxide donor, (Z)-1-[N-(2-aminoethyl)-N-(2-ammonioethyl) aminio] diazen-1-ium-1,2-diolate (DETA/NONOate), enhances angiogenesis, neurogenesis and neurological functional recovery after stroke in rats compared to indivi...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/j.brainres.2003.11.080
更新日期:2004-04-16 00:00:00
abstract::The neurotoxicity of ionomycin, a Ca2+ ionophore, was investigated in cultured cortical neurons from embryonic rats. While about 90% of neurons survived 2 h after exposure to ionomycin, the surviving neurons had decreased by about 30 to 40% at 16 h. Both RNA and protein synthesis inhibitors blocked this neurotoxicity....
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(94)90317-4
更新日期:1994-07-25 00:00:00
abstract::The effect of bombesin on the activity of dopamine (DA) neurons comprising the nigrostriatal, mesolimbic, tuberoinfundibular and tuberohypophysial systems in the male rat was determined by measuring: (1) the accumulation of 3,4-dihydroxyphenylalanine (DOPA) after administration of a decarboxylase inhibitor, and (2) th...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(91)91745-m
更新日期:1991-11-22 00:00:00
abstract::Spontaneous alternation which is disrupted by lesion of septal dopaminergic (DA) afferents was chosen as a behavioral marker for the study of functional interactions between DA and noradrenergic (NA) innervation of the lateral septum. Three groups of rats were studied: a solvent group which received only vehicle injec...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(91)90669-m
更新日期:1991-06-21 00:00:00
abstract::The effect of thyrotropin releasing hormone (TRH) administered either subcutaneously (s.c.) or intracerebroventricularly (i.c.v.) on the analgesic and hypothermic actions of U-50,488H, a highly selective kappa-opiate agonist, was determined in male Swiss Webster mice. Intraperitoneal administration of U-50,488H (8-32 ...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(93)90144-c
更新日期:1993-10-15 00:00:00
abstract::Ciliary ganglion neurons from chick embryo were grown in cell culture following enzymatic and mechanical dissociation. The culture conditions necessary for long-term (greater than 21 days) survival of the isolated neurons were investigated. Neurons could be cultured with and without non-neural cells by adjusting the c...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(80)90127-4
更新日期:1980-02-03 00:00:00
abstract::The effect of intracerebroventricular administration of low-antinociceptive doses of selective mu- (DAMGO) or delta- (DPDPE) opioid agonists on the dose-dependent antinociceptive effects produced by intrathecal administration of sequentially increasing doses of selective mu-, delta-, or kappa-(U50,488H) opioid agonist...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(92)91449-o
更新日期:1992-11-06 00:00:00
abstract::Appetite suppressants lose efficacy when given chronically; the mechanisms are unknown. We gave male rats once-daily dl-fenfluramine (dl-FEN, 5 mg/kg, i.p.) injections for 15 days and measured mRNA expression of corticotropin releasing factor (CRF), neuropeptide Y (NPY) and proopiomelanocortin (POMC) in hypothalamic n...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/j.brainres.2006.02.129
更新日期:2006-05-04 00:00:00
abstract::The dorsal root ganglia (DRG) have been identified as the target tissue in diabetic somatosensory neuropathy. It has been reported that, in the chronically diabetic state, DRG sensory neurons may undergo morphological changes. In this study, we examined the effect of zenarestat, an aldose reductase inhibitor, on the m...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/j.brainres.2008.10.018
更新日期:2009-01-09 00:00:00
abstract::There is increasing evidence that traumatic brain injury (TBI) induces hypofunction of the striatal dopaminergic system, the mechanisms of which are unknown. In this study, we analyzed the activity of striatal tyrosine hydroxylase (TH) in rats at 1 day, 1 week, and 4 weeks after TBI using the controlled cortical impac...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/j.brainres.2010.10.096
更新日期:2011-01-19 00:00:00
abstract::The ability of membrane-associated peptidases from the brains of spontaneously hypertensive rats (SHRs) and normotensive Wistar-Kyoto (WKY) rats to metabolize iodinated angiotensin (125I-Ang II) and 125I-Ang III was compared. 125I-Ang II was metabolized to 125I-Ang III and other fragments exclusively by membrane-assoc...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(90)90844-2
更新日期:1990-10-08 00:00:00
abstract::In the present study, the effects of bilateral injections of N-methyl-d-aspartate (NMDA) receptor agonist and/or antagonist into the central amygdala (CeA) on the acquisition and expression of morphine-induced conditioned place preference (CPP) were investigated in male Wistar rats. Animals that received 3 daily subcu...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/j.brainres.2006.11.049
更新日期:2007-02-16 00:00:00