Abstract:
:Progressive degeneration of dopaminergic neurons in the substantia nigra pars compacta is the main histopathological characteristic of Parkinson's disease. We studied the electrophysiological characteristics of the spontaneous activity of substantia nigra pars compacta dopaminergic neurons in rats with a partial, unilateral, 6-hydroxydopamine lesion of the nigrostriatal pathway. In addition, the effects of subthalamotomy and prolonged levodopa treatment on the activity of dopaminergic neurons were investigated. As a result of the lesion ( approximately 50% neuronal loss), the number of spontaneously active neurons was significantly reduced. Basal firing rate, burst firing and responsiveness to intravenously administered apomorphine remained unchanged. In contrast, the variation coefficient, a measure of interspike interval regularity, was significantly increased. Ibotenic acid (10 microg) lesion of the ipsilateral subthalamic nucleus in lesioned rats did not modify the electrophysiological parameters. However, prolonged levodopa treatment (100 mg/kg/day + benserazide 25 mg/kg/day, 14 days) reversed the irregularity observed in cells from lesioned rats, while it induced an irregular firing pattern in cells from intact rats. Our results using an experimental model of moderate Parkinson's disease indicate that surviving substantia nigra pars compacta dopaminergic neurons fire irregularly. In this model, subthalamotomy does not modify the firing pattern while levodopa treatment efficiently restores normal firing of SNpc neurons and does not appear to be toxic to them.
journal_name
Brain Resjournal_title
Brain researchauthors
Bilbao G,Ruiz-Ortega JA,Miguens N,Ulibarri I,Linazasoro G,Gómez-Urquijo S,Garibi J,Ugedo Ldoi
10.1016/j.brainres.2006.02.052subject
Has Abstractpub_date
2006-04-21 00:00:00pages
175-84issue
1eissn
0006-8993issn
1872-6240pii
S0006-8993(06)00427-6journal_volume
1084pub_type
杂志文章相关文献
BRAIN RESEARCH文献大全abstract::The time courses for development of neuronal and behavioral tolerance to diazepam (DZ) were estimated in rats continuously exposed to low levels of DZ for 3, 7, 14 or 21 days. Microiontophoretic sensitivity of dorsal raphe neurons to gamma-aminobutyric acid (GABA) was initially facilitated after short-term exposure to...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(87)90993-0
更新日期:1987-03-03 00:00:00
abstract::Hydrocephalus with aqueduct stenosis was a consistent feature in mice which received a single intraperitoneal injection of 6-aminonicotinamide (6-AN) on day 5 postnatal. Chronological investigation revealed that 6-AN-treated mice had aqueductal obstruction with edematously swollen ependymal cells and spongy changes in...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0165-3806(85)90180-4
更新日期:1985-10-01 00:00:00
abstract::The retinal spreading depression has been used as a tool to investigate the action of nitric oxide (NO) as a diffusible neurotransmitter which in many cases acts by raising the cGMP level in target cells. The role of NO as a vasodilating agents has been well-established and it has been suggested that the vasodilatatio...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(95)00737-b
更新日期:1995-09-11 00:00:00
abstract::The nigrostriatal projection was studied with a retrograde tracing method (Evans blue, EB) combined with a technique for dopamine histofluorescence. The study, realized in control rats and in animals with 6-hydroxydopamine-induced lesions of the dopaminergic pathway, yielded the following results. (1) In 3 control rat...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(81)90235-3
更新日期:1981-06-01 00:00:00
abstract::This paper describes an electrochemical method for the detection of dopamine and serotonin in vitro. Dopamine and serotonin can be distinguished from each other without interference from metabolites. 3-4-dihydroxyphenylacetic acid and 5-hydroxyindoleacetic acid. The method also provides selective differentiation of do...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(89)91224-9
更新日期:1989-08-21 00:00:00
abstract::The effects of different ionic media on Ca2+ uptake and release in isolated brain microsomes were investigated. KCl (100 mM) provided the best medium for Ca2+ uptake in the presence of ATP. The effect of myo-inositol 1,4,5-trisphosphate (IP3) on Ca2+ release was examined and was maximum at 0.2 microM. IP3-induced Ca2+...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(87)90562-2
更新日期:1987-09-01 00:00:00
abstract::The microdialysis technique was utilized to study the effects of N-methyl-D-aspartate (NMDA) receptor ligands on the in vivo release of endogenous glutamate (Glu) and aspartate (Asp) from the rat striatum. Addition of NMDA (250 and 500 microM) to the dialysis perfusion solution resulted in a striking dose-dependent in...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(92)91195-k
更新日期:1992-07-10 00:00:00
abstract::Maternal melatonin readily crosses the placenta to provide the fetus with time-of-day and day length information. To determine if melatonin could have a broader role during development than is currently recognized, melatonin receptor expression was examined in somatic sites during Siberian hamster embryogenesis. Using...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(91)91424-y
更新日期:1991-12-24 00:00:00
abstract::Ion-sensitive microelectrodes were used to study the behavior of extracellular ions in rat sciatic nerve during and following activity. Nerve stimulation produced increases in [K+]o that were dependent upon the frequency and duration of stimulation; no change in extracellular pH occurred with stimulation. Increases in...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(91)90666-j
更新日期:1991-06-21 00:00:00
abstract::2-Deoxy-d-glucose (2DG) is a glucose analogue that inhibits intracellular utilization of glucose and produces a characteristic behavioral response known as glucoprivic feeding. The area postrema (AP) is a caudal hindbrain structure shown previously to be involved in 2DG-induced glucoprivic feeding. In addition, periph...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/s0006-8993(98)00528-9
更新日期:1998-08-10 00:00:00
abstract::Neuropeptide Y (NPY) has been detected immunocytochemically in cerebral cortex and subcortical white matter of the primate frontal, parietal, temporal, and occipital lobes. Because little is known about NPY in the primate insular lobe and because peptides play an important role in normal neuronal functioning and alter...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(93)91245-n
更新日期:1993-02-19 00:00:00
abstract::Behavioral responses to light tactile stimulation of the skin of the head of axolotls were variable in occurrence but were of a constant pattern. Retraction of the eyes and gills followed stimulation of dorsal but not ventral skin. Ventral skin yielded lowering of the head. Touching near the lips caused turning of the...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0165-3806(81)90037-7
更新日期:1981-09-01 00:00:00
abstract::Almost anyone who has ever lost weight can attest that it is harder to sustain weight loss than to lose weight. Maintenance of a 10% or greater reduced body weight is accompanied by decreases in energy expenditure to levels significantly below what is predicted solely on the basis of weight and body composition change...
journal_title:Brain research
pub_type: 杂志文章,评审
doi:10.1016/j.brainres.2010.05.062
更新日期:2010-09-02 00:00:00
abstract::The effect of dopamine (DA) on the calcium-activated potassium conductance underlying the slow afterhyperpolarization (AHP) which follows a train of action potentials in hippocampal pyramidal cells was studied utilizing the in vitro hippocampal slice preparation. Bath-applied DA (1-100 microM) significantly reduced th...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(86)90773-0
更新日期:1986-08-06 00:00:00
abstract::The effects of axotomy, chemical sympathectomy and preganglionic denervation on the expression of the neuropeptides, pituitary adenylate cyclase-activating peptide (PACAP), galanin (GAL), and the PACAP type 1 receptor in the rat superior cervical ganglion (SCG) were investigated by immunocytochemistry, in situ hybridi...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/s0006-8993(97)00923-2
更新日期:1997-11-14 00:00:00
abstract::Pretreatment with scopolamine, 3 mg/kg, prevented the acquisition of a passive avoidance task in rats. These amnesic effects of scopolamine could largely be overcome by treatment with 100 mg/kg of the nootropic drug piracetam. In order to identify the brain structures involved, the effects of these drugs on regional e...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(87)91186-3
更新日期:1987-10-20 00:00:00
abstract::Unilateral olfactory nerve section was performed in the mouse. Three biochemical markers of the olfactory chemoreceptor neurons: carnosine, carnosine synthetase activity and the olfactory marker protein, were measured in the olfactory bulb and epithelium. Parallel observations were made by light microscopy as well as ...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(77)90703-x
更新日期:1977-08-19 00:00:00
abstract::Perfusion of hippocampal slices with normoxic medium containing no added sodium resulted in a rapid loss of the CA1 population spike, with only 35 +/- 10% (S.E.M.) (P < 0.001) recovery after a 15 min exposure. This injury was prevented by the non-competitive N-methyl-D-aspartate (NMDA) antagonist MK-801 (93 +/- 4% rec...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(92)91464-p
更新日期:1992-11-06 00:00:00
abstract::The role of bulbospinal neuropeptide Y (NPY)-containing neurons of the rostral ventrolateral medulla in the rabbit in mediating the increase in blood pressure that occurs during inhibition of cells in the caudal ventrolateral medulla was investigated in urethane-anaesthetized rabbits. In the present experiments bilate...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(87)91261-3
更新日期:1987-09-15 00:00:00
abstract::We examined the radical-scavenging activity of docosahexaenoic acid (DHA) and its effects on the neuronal cell death induced by oxidative or hypoxic stress in cultured retinal ganglion cells (RGC-5, a rat ganglion cell-line transformed using E1A virus). The radical-scavenging activity [hydrogen peroxide (H(2)O(2)), su...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/j.brainres.2008.11.031
更新日期:2009-01-28 00:00:00
abstract::Nestin is an intermediate filament protein, transiently and abundantly expressed early in embryogenesis, e.g., in neuroepithelial cells, radial glia, germinal matrix cells and vascular cells. In the adult rat brain, nestin is only present in endothelial and select subventricular cells. We tested the hypothesis that af...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/s0006-8993(99)01502-4
更新日期:1999-08-14 00:00:00
abstract::At two weeks post-transplantation, sciatic nerves inserted into the lesioned septo-hippocampal pathway contain NGF levels more than twice that of normal nerves. These transplanted nerves also contain regenerating cholinergic axons. Moreover, transplanted animals exhibit septal NGF levels that are significantly greater...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(91)90147-n
更新日期:1991-08-23 00:00:00
abstract::Experimental and genetic hypertension in male rate is accompanied by a lower specific [3H]naloxone binding in the dorsal horn of the spinal cord, and in the hippocampus as compared to controls. Rats which are genetically resistant to hypertensive stimuli have a higher specific [3H]naloxone binding in the nucleus tract...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(81)91265-8
更新日期:1981-05-25 00:00:00
abstract::The effects of subchronic administration of the antidepressant fluoxetine (15 mg/kg i.p., 14 days) on thyroid hormone metabolism were investigated in 11 regions of the CNS and three peripheral tissues in the rat. Fluoxetine significantly enhanced the activity of the 5'II-deiodinase isoenzyme (5'D-II), which catalyzes ...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(94)91424-9
更新日期:1994-01-28 00:00:00
abstract::The central type benzodiazepine receptor (BDZr), an allosteric modulatory site of the GABAA receptor-anion channel, has been shown in vitro to respond to drugs with positive efficacy (agonists), zero efficacy (competitive antagonists) and drugs with negative efficacy (inverse agonists). However, this general concept o...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(91)90131-e
更新日期:1991-08-23 00:00:00
abstract::In order to investigate protein function in rat primary cortical neuronal cultures, we modified an adenoviral vector expression system and assessed the strength and specificity of the cytomegalovirus (CMV), rous sarcoma virus (RSV), and rat and human synapsin 1 (SYN1) promoters to drive DsRed-X expression. We also inc...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/j.brainres.2006.04.089
更新日期:2006-08-02 00:00:00
abstract::Changes in the partial pressure of arterial CO2 (PaCO2) regulates cerebrovascular tone and dynamic cerebral autoregulation (CA). Elevations in PaCO2 also increases autonomic neural activity and may alter the arterial baroreflex. We hypothesized that hypercapnia would impair, and hypocapnia would improve, dynamic CA an...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/j.brainres.2008.07.048
更新日期:2008-09-16 00:00:00
abstract::Spinal cord injury (SCI) often results in some form of paralysis. Recently, SCI therapy has been focused on preventing secondary injury to reduce both neuroinflammation and lesion size so that functional outcome after an SCI may be improved. Previous studies have shown that adenosine receptors (AR) are a major regulat...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/j.brainres.2015.12.053
更新日期:2016-03-01 00:00:00
abstract::The in vitro model presented provides an approach to study the nature of cell volume control as well as of swelling mechanisms under pathophysiological conditions. Pertinent parameters of cell volume control can be analyzed in isolation due to a virtually infinite extracellular environment precluding secondary effects...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(83)90180-4
更新日期:1983-11-21 00:00:00
abstract::In the present study, uptake of glutamine by rat cerebellar granule cells, a predominantly glutamatergic nerve cell population, has been investigated. Glutamine is taken up by granule cells via at least three transport systems, A, ASC and L. The L-type low affinity system (K(m) = 2.6 mM) is the major transport system ...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/s0006-8993(97)00139-x
更新日期:1997-05-16 00:00:00