Abstract:
:The effects of divalent and trivalent cations on the gamma-aminobutyric acid (GABA)-induced chloride current were studied with rat dorsal root ganglion neurons in primary culture using the whole-cell configuration of the patch-clamp technique. Lanthanum (La3+) reversibly potentiated the GABA-induced current with a half-maximal effective concentration (EC50) of 231 microM and the maximal potentiation to about 300% of control. La3+ did not seem to compete with chlordiazepoxide, pentobarbital or picrotoxin for binding sites, which indicated that the La3+ binding site was distinct from any of the benzodiazepine, barbiturate and picrotoxin binding sites on the GABA receptor-channel complex. Copper (Cu2+) reversibly suppressed the current induced by GABA with an EC50 of 19 microM in a non-competitive manner. Zinc (Zn2+) and Cu2+ had a very similar action on GABA response in terms of potency and efficacy. The degree of suppression of GABA-induced current by Cu2+ and Zn2+ was not affected by La3+, whereas Cu2+ antagonized the blocking action of Zn2+ in a concentration-dependent manner. Therefore, La3+ does not interfere with the binding site(s) for Cu2+ and Zn2+, whereas Cu2+ and Zn2+ may share a common site. These results are consistent with the presence of at least two distinct binding sites for polyvalent cations on the GABA-receptor channel complex: one for positive regulation by La3+ and the other for negative regulation by Cu2+ and Zn2+. These two sites are likely to be located at or near the external orifice of the chloride channel.
journal_name
Brain Resjournal_title
Brain researchauthors
Ma JY,Narahashi Tdoi
10.1016/0006-8993(93)91510-ysubject
Has Abstractpub_date
1993-04-02 00:00:00pages
222-32issue
1-2eissn
0006-8993issn
1872-6240pii
0006-8993(93)91510-Yjournal_volume
607pub_type
杂志文章相关文献
BRAIN RESEARCH文献大全abstract::Molecular events associated with mnemonic processes and neuronal plasticity are postulated to result in functional changes in synaptic structure. One possible site is the post-synaptic density, where activity-dependent changes modulate signal transduction cascades. In this report, we detail spatial-temporal changes fo...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/j.brainres.2005.02.023
更新日期:2005-04-18 00:00:00
abstract::Tissue culture preparations of the myenteric plexus from the guinea pig taenia coli have been studied by electron microscopy. Three main cell types can be identified: neurons, enteric glial cells and fibroblasts. The ultrastructure of these cells resembles that of the same cells in situ. Neuronal processes form close ...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(83)90467-5
更新日期:1983-02-28 00:00:00
abstract::Previous research suggests that the prelimbic subregion of the medial prefrontal cortex (mPFC) is necessary for acquisition of cocaine-conditioned place preference (CPP). Recently, it has been shown that extinguished cocaine-CPP can be reinstated by cocaine priming injections, and that this effect reflects the incenti...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/s0006-8993(03)03452-8
更新日期:2003-11-14 00:00:00
abstract::In anaesthetized cats, medial gastrocnemius motor units (MUs) were stimulated with random sequences (mean rates between 6 and 12 pps) of electrical pulses delivered to their axons in small ventral root filaments. Muscle tension was recorded under isometric conditions, and spike trains of muscle spindle afferents were ...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(86)91656-2
更新日期:1986-02-19 00:00:00
abstract::Soluble guanylyl cyclase is a heterodimeric (alpha, beta) enzyme generating the second messenger, cGMP, upon activation by the gaseous messenger, nitric oxide. The occurrence and distribution of alpha 1-, alpha 2-, beta 1- and beta 2-subunits were investigated in trigeminal and dorsal root ganglia on the mRNA and the ...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(96)00097-2
更新日期:1996-05-20 00:00:00
abstract::Propofol is an intravenous anesthetic with neuroprotective effects against cerebral ischemia-reperfusion (I/R) injury. Few studies regarding the neuroprotective and neurobehavioral effects of propofol have been conducted, and the underlying mechanisms are still unclear. Because I/R may result in neuronal apoptosis, th...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/j.brainres.2011.06.060
更新日期:2011-09-02 00:00:00
abstract::beta-Amyloid is the primary protein component of neuritic plaques, which are degenerative foci in brains of patients with Alzheimer's disease (AD). The effects of this naturally occurring beta-amyloid on the cells of the central nervous system have not been completely understood. beta-Amyloid increases the vulnerabili...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/s0006-8993(97)00043-7
更新日期:1997-04-18 00:00:00
abstract::We examined the distribution of myelin antigens recognized by monoclonal antibodies (mAbs) 01 and 04 in the developing ventral white matter of the cervical spinal cord of the rat using immunogold-labeled ultrathin cryosections. From the beginning of myelination after birth to multilamellar myelin in adult animals, we ...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(95)00224-e
更新日期:1995-07-24 00:00:00
abstract::We have shown previously that progesterone linked with bovine serum albumin at position 3 of the progesterone molecule (P-3-BSA) was effective in modulating (both stimulating and inhibiting) amphetamine (AMPH)-evoked dopamine (DA) release in vitro from superfused corpus striatal (CS) tissue fragments of ovariectomized...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(91)90395-c
更新日期:1991-01-04 00:00:00
abstract::Previous studies showed that hyperbaric oxygen (HBO) promoted cell proliferation in hypoxic-ischemic (HI) neonate rats. Neural stem cells (NSC) existed in the brain lifelong and can be activated. This study was undertaken to assess whether HBO treatment promoted the proliferation of NSC and repaired the brain damage r...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/j.brainres.2008.05.016
更新日期:2008-07-30 00:00:00
abstract::Intracranial pressure (ICP) was monitored to evaluate the therapeutic effect of hyperbaric oxygen (HBO(2)) treatment following traumatic brain injury (TBI). This subject is controversial. The aim of our study was to determine whether HBO(2) treatment has a therapeutic effect on ICP dynamics and survival following seve...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/j.brainres.2005.02.049
更新日期:2005-06-21 00:00:00
abstract::Thermoregulatory (brown adipose tissue temperature) experiments were conducted in age-matched anesthetized, male Sprague-Dawley and Long Evans rats kept at 37 degrees C given unilateral electrical stimulation of the ventromedial hypothalamic nucleus or the lateral preoptic area or after intravenous infusion of norepin...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(92)90422-6
更新日期:1992-03-13 00:00:00
abstract::Cingulate cortex (CC) unit responses to hippocampal volleys and afterdischarges were studied in 4 awake unsedated squirrel monkeys using extracellular microelectrodes. Stimuli were delivered via bipolar electrodes chronically implanted bilaterally in anterior and posterior hippocampus. A total of 412 units in 21 track...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(83)91253-2
更新日期:1983-01-24 00:00:00
abstract::The responses of single neurons in the insular cortex to electrical stimulation of the chorda tympani (CT), lingual-tonsillar branch of the glossopharyngeal (LT-IXth) nerve, pharyngeal branch of the glossopharyngeal (PH-IXth) nerve, and superior laryngeal (SL) nerve were recorded in anaesthetized and paralyzed rats. N...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/s0006-8993(97)00483-6
更新日期:1997-07-25 00:00:00
abstract::Frontal and temporal sections of 4 normal human brains and 3 brains from patients with a diagnosis of Alzheimer-type dementia (ATD) were stained with Vicia villosa lectin conjugated to biotin to localize glycoproteins containing terminal N-acetylgalactosamine. These lectin binding sites were localized at the surface o...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(89)90416-2
更新日期:1989-09-25 00:00:00
abstract::Circular RNAs (circRNAs) are a class of covalently closed non-coding RNAs, and aberrant alteration of their expression patterns is studied in numerous diseases. This study aimed to investigate whether intracerebral hemorrhage (ICH) affected circRNA expression profiles in the rat brain. Adult male Sprague-Dawley rats w...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/j.brainres.2019.146490
更新日期:2020-01-01 00:00:00
abstract::Homer1a is implicated in depression in humans and depression-like behavior in mice. To further understand the role of Homer1a in stress-induced emotional changes, we applied very mild stress to Homer1a knockout (H1a KO) mice. The wild-type (WT) and H1a KO mice were restrained for 2h daily for 7 consecutive days at the...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/j.brainres.2015.02.008
更新日期:2015-04-24 00:00:00
abstract:BACKGROUND:Diminished dopaminergic neurotransmission contributes to decreased reward and negative eating behaviors in obesity. Bariatric surgery is the most effective therapy for obesity and rapidly reduces hunger and improves satiety through unknown mechanisms. We hypothesized that dopaminergic neurotransmission would...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/j.brainres.2010.03.064
更新日期:2010-09-02 00:00:00
abstract::Phenoxybenzamine can selectively eliminate the s-IPSP, in the presence of anti-cholinesterases that enhance s-IPSP and s-EPSP; and the alpha 2-antagonist, yohimbine, can partially but consistently depress s-IPSP selectively. The results provide positive pharmacological support for the monoaminergic nature of the trans...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(82)90321-3
更新日期:1982-06-24 00:00:00
abstract::We have characterized the effects of retinoic acid (RA) on the growth, morphology and biosynthesis of cytoskeletal proteins in NB2a mouse neuroblastoma cells. In addition, the morphological and biochemical changes were compared to those induced by dibutyryl cyclic AMP (db cAMP). Growth inhibition by RA was concentrati...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0165-3806(85)90220-2
更新日期:1985-08-01 00:00:00
abstract::The immunosuppressive macrolide FK-506 has been shown to protect neurons in culture against glutamate excitotoxicity. This effect was attributed to the binding of immunosuppressants to calcineurin-inhibiting immunophilins. We now report that also the non-immunosuppressive macrolide antibiotics protect neurons in cultu...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(93)90098-8
更新日期:1993-10-08 00:00:00
abstract::The depolarizing photoreceptor potential in the molluscan extraocular photoreceptor, A-P-1, results from the light-induced suppression of specific K+ currents. An application of cGMP or IBMX (inhibitor of phosphodiesterase) to A-P-1-evoked light-suppressed currents, similar to the above specific K+ currents. Thus, the...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(89)90682-3
更新日期:1989-04-17 00:00:00
abstract::The content of the mRNAs that code for prepro-corticotropin releasing hormone (ppCRH), prepro-neurotensin/neuromedin N (ppNT/NMN) and prepro-enkephalin (ppENK) was measured using in situ hybridization histochemistry in the various subdivisions of the hypothalamic paraventricular nucleus (PVH) 4 h after a bout of ether...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(91)90080-f
更新日期:1991-03-29 00:00:00
abstract::Traumatic brain injury (TBI) in humans typically produces neurological suppression and a longer lasting impairment of memory clinically defined as post-traumatic amnesia. An animal model that reliably reproduces the physiological changes associated with TBI was used to assess the memory deficits following brain injury...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(93)91014-j
更新日期:1993-06-18 00:00:00
abstract::The origin of neuronal perikarya which project to the external zone of the median eminence (the tuberoinfundibular neuronal system) was determined in the rat after injection or diffusion of wheat germ agglutinin (WGA) into the median eminence. The retrogradely transported lectin was detected in neurons using an immuno...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(82)90334-1
更新日期:1982-08-05 00:00:00
abstract::The effects of repetitive pilocarpine-induced status epilepticus (SE) in the hippocampal Na(+)/K(+)ATPase activity were studied in developing rat. Na(+)/K(+)ATPase is a membrane-bound enzyme responsible for the active transport of sodium and potassium ions through the membrane. It is necessary to maintain neuronal exc...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/j.brainres.2006.12.068
更新日期:2007-03-23 00:00:00
abstract::NMDA receptor activation leads to elevated Ca2+ in cultured rat cortical and retinal ganglion cell neurons. If excessive, this Ca2+ response is associated with delayed neurotoxicity. We used dantrolene and ionomycin to test if the Ca2+ response to NMDA was due to mobilization of intracellular Ca2+ stores rather than m...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(92)90183-a
更新日期:1992-12-11 00:00:00
abstract::Previous studies found that injection of the GABA uptake inhibitor nipecotic acid into the nucleus tractus solitarius (NTS) increases arterial pressure. This effect of nipecotic acid was not antagonized by the selective GABAA receptor blocking agent bicuculline, suggesting that the action of nipecotic acid was mediate...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(90)91227-8
更新日期:1990-09-03 00:00:00
abstract::Clusters of carotid body (glomus) cells cultured from a few days to 3 weeks, maintained their morphological characteristics during this period. The resting potential (Em) and input resistance (Ro) did not change for 2 weeks but both declined afterwards. The intracellular pH (pHi) of glomus cells, measured with glass m...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/0006-8993(91)90969-3
更新日期:1991-05-03 00:00:00
abstract::In this microdialysis study we measured the extracellular neuropeptide Y (NPY) levels in the dorsal hippocampus of conscious rats. During potassium-induced depolarisations, a 93% increase in extracellular levels of NPY was observed. NPY has been demonstrated to reduce kainic acid-induced convulsions in rats, but it is...
journal_title:Brain research
pub_type: 杂志文章
doi:10.1016/s0006-8993(97)01374-7
更新日期:1998-01-19 00:00:00